Fluorescent powder in order to adjust the backlight is more suitable for oled module

Because the use of a flat head to the light source is to achieve cost reduction targets, so the carbon nanotube field emission phosphors used must also make an adjustment to desired characteristics of the emitted light, and will not, and the current cold cathode fluorescent lamp light emitted by a large gap. Character LCD Display
The use of the CRT white fluorescent powder, color temperature that appears relatively high, that is, the situation will be bluish, fluorescent powder so an adjustment must be re-done, or as if the light emitted from the original characteristics of the cold cathode lamp light emitted, characteristic difference is too large will affect the color filters, however, change Ruoyin back light, it is desirable to replace the cold cathode fluorescent lamp and a color filter must be followed to make changes, Perhaps there will be more harm than good, hence the choice of the phosphor can not follow the original CRT phosphors, but must do some adjustment or development.
There are about two ways to develop field emission phosphor used, the first is the use of existing RGB phosphors for color mixing, thus obtained would be more white wide color gamut, because we all know CRT phosphor powder which can reach 100% of NTSC, and at least such a backlight fluorescent powder, substantially reaches 100% NTSC is generally not a problem. serial display modules
Another way to develop new white fluorescent powder phosphors such as the setting of the initial goal is to be issued with the hope to achieve the same characteristics as the cold cathode fluorescent lamp light, so perhaps a beginning must reach phosphor coordinates 0.33,0.34 about the condition.

Multicolor LED backlit bright picture oled module

Because of the inherent characteristics lead CCFL certain colors can not break through barriers, making the color performance can not enable consumers to enjoy rich, sharp images similar nature, especially not a perfect showing bright red color. However, because the pursuit of high CRI goals, replace the CCFL light source technology will continue to be made, which, in the promising than the use of multi-color LED as a backlight, and its wide color gamut, has attracted a lot of the industry's focus, have also inputs related development. TFT Lcd Modules
weak performance of traditional CCFL red
Currently, most of the display industry are using a cold cathode fluorescent lamp as a light source monitor, and coordinates the distribution of RGB color as the color filter array, in general, CCFL so the color temperature of about 4800K, the color gamut table is reflected, can be found Only about 80% of the NTSC specification.
Of course, this display screen, or for general applications, and will not be much of a problem, or the visual experience poor color, but in the case of the face of the instrument measuring the performance of a particular color in the environment, will be able to compare the apparent impure Fai line has sub peak phenomenon. In particular, the performance of CCFL is more on the weak red light, which is the performance of the color CCFL most difficult to meet the stringent requirements that.
And, as for the order CCFL backlight source that is there is a specific factor affecting the performance of the color gamut, but may not be completely unable to think. According to the conventional tri-color color filter to be improved to compensate this defect. OLED Display Module

The use of multi-color color filter to make up the shortfall oled module

Same as using CCFL backlight source module basis, CMO has developed three models with four or more colors multicolor filters as color performance, respectively, in the original R (red), G (green) and B (blue) 3 colors, an increase of added Y (yellow) and C (cyan) 5-color filter panels. More on the basis of the RGB color Y (yellow) color filter of four colors of the panel, and in RGB 3 colors based on the increase W (white) color of the color filter panel 4.
Indeed, such a design, the same expanding the color gamut, to increase the Y (yellow) and C (cyan), and the increase in Y (yellow) of the panels, for example, the range of the NTSC color gamut compared to low temperature lcd, respectively, 115% and 109%. Increasing the white color filter panel only for the purpose to improve the overall brightness.
Of course, this is the basis of the original source, the use of color filters to achieve the purpose to enhance the color gamut, but eventually the inherent limitations, can not be so greatly expanded color gamut, may still need to be changed from a backlight, , was able to expand the color range to achieve the goal.
With current technology and components of view, quite suitable way is to use LED as a backlight, the LED has a multi-wavelength characteristics can be produced according to the unique needs of the wavelength, and the use of circuit design to complete the brightness control. lcd module 

Mercury cold cathode fluorescent lamp gradually reach the practical stage oled module

Due to the current cold cathode fluorescent tubes, the use of mercury to be discharged, so there has been shadow impact on the environment, and coupled with the EU RoHS norms, which is about to face. EU regulations from July 1, 2006, Controlling contain lead, cadmium, mercury, and hexavalent chromium and brominated flame retardants and other elements or application products imports.
Currently industry is still unable to effectively locate the cold cathode fluorescent lamp mercury alternatives, although the EU will not fully control, but has cold cathode fluorescent lamps containing mercury has made no more than 5mg limit. On industrial technology, has been able to overcome contains mercury does not exceed the upper limit of 5mg, reaching about 3mg or less, but in the long run, the threshold of mercury is still to be overcome. Character LCD Modules
Meanwhile, the use of mercury discharge factor, if the ambient temperature is too low, can also cause the phenomenon is not easy to start, this especially in the temperate and boreal markets becomes more apparent. In addition to the impact caused by difficult start, the temperature of the environment because of the use of mercury vapor pressure will also cause the luminance and luminous efficiency including some impact, so the cold start and other environmental issues is the cold cathode fluorescent tube technically most urgent be solved. Because of such factors backdrop, mercury cold cathode fluorescent tube development, has become all the cold cathode fluorescent lamp industry eager to resolve the issue. Low Temperature Display

Mercury CCFL difficult to overcome technological bottlenecks environmental temperature TFT Display Module

In general, the cold cathode fluorescent tube used in inorganic mercury are mercury, and organic mercury compared to that of the human body to a lesser extent, but the current cold cathode fluorescent tubes discarded most of the use of landfill The way to deal with, however, such an approach would make obsolete cold cathode fluorescent inorganic mercury in organic produce, also faced the issue of environmental protection, making the cold cathode fluorescent lamps, mercury-based requirements have continued being emerge. OLED Display Module
Of course, no mercury cold cathode fluorescent tubes in terms of not only refers entirely without mercury, which also includes the use of a small amount of mercury and technologies to meet environmental standards. The so-called implication is that using a small amount of mercury in the cold cathode fluorescent tube by adding a certain small amount of mercury, and mercury in these cold cathode fluorescent lamp life is reached, while also being consumed completed, and let the cold cathode fluorescent abandoned Lamp will not have much impact on the environment.
In addition, use of the environment in terms of the face, the use of mercury discharge cold cathode fluorescent tube and a biggest problem is that mercury discharge to a very high temperature sensitivity at different temperatures, there will be considerable pressure changes (Figure I), this will have on the overall performance of the display panel to bring a certain extent, perhaps in temperate regions the products to achieve color accuracy requirements, but once sold to the arctic or tropical regions the market, often color accuracy will be some differences. graphic lcd display module
Figure a pressure curve can be seen, when the temperature rises or falls several degrees, the mercury vapor pressure will be a considerable degree of change, thereby affecting the overall performance. On the ambient temperature, the boreal regions by the problems more than the tropics, resulting in a low temperature environment because of difficulty in starting, you need a longer time to reach the standard brightness and so on.
For such a phenomenon problems in the boreal areas, mostly applicable to make use of the mercury vapor pressure heater rise, and troubleshoot startup problems, and so subject. There is a very important point, because the lack of mercury wall protection, making the UV will continue to directly impact the wall, making the wall will appear premature aging and thus affect life expectancy.

CCFL find alternative element mercury TFT Display Module

In the absence of mercury cold cathode fluorescent tube technology development, global industry are positive expectations to find a substitute for mercury, but because of the relationship between characteristics and goals, have been unable to locate or high performance and mercury as a substitute for mercury element. Expected to achieve the required gas requires several conditions, including: First, to a very strong UV radiation intensity to achieve high luminance requirements. Second, the ultraviolet wavelength fluorescent wall can not bring too much damage that would otherwise occur lamp wall early deterioration phenomenon, making the life of the cold cathode fluorescent tube rapidly shortened. Third, it requires a longer ultraviolet wavelengths, as long wave ultraviolet light can be improved longer visible light conversion efficiency and improve the overall performance of the cold cathode fluorescent tube. graphic lcd 128x64
Due to the above conditions, has been developed more Xe gas to replace the use of cold cathode fluorescent tube mercury as fluorescent lamps discharge medium. The structure is being taken in the inner wall of the glass tube coated with fluorescent powder and sealed xenon gas. Disposed at one end of the glass tube with the general CCFL same internal electrode, and the spirally wound wire to the lower tube wall, as the other electrode. By applying a voltage between the internal and external electrodes to form a discharge, Xe gas discharge UV fluorescent powder is converted into visible because light. OLED Display

LED electronic TFT Display Module of true color image reproduction

Full color LED electronic display visual theory and color TV, lcd module  , is through the red, green, and blue colors of different light intensity reduction of image color reproduction. Red, green and blue image directly affects the degree of purity of the color reproduction of visual effects. However, the ratio of three color white is not a simple superposition of the three colors. First, to ensure the pure optical frequency premise require red, green and blue intensity ratio must be approximately 3:6:1; Second, since the visual sensitivity to red, the red light source required to be dispersed in the space distribution; Third, because the visual red, green, and blue light response of different non-linear curve, require different white light to red, green and blue to be similar to the television sets of the γ correction; s Fourth, the human visual ability to distinguish the color difference is limited. Therefore, you must identify the authenticity of the image color reproduction of objective indicators. In order to reproduce the true color images, the 144x32 lcd light on the electronic display should meet some of the following requirements:
① red, green and blue color should be that of the wavelength: 660nm, 525nm, 470nm or so;
② The four units with white light better (multi-tube unit can be, depending on the light intensity);
③ red, green, and blue gray level is 256;
④ LED pixel pipe must be used for non-linear correction.
Red, green, and blue light and non-linear correction can be implemented in hardware using the display control system, playback system can also be implemented in software.

Analysis EL backlight driver works TFT Display Module

With the popularity of civilian high-tech products, the former only in the driver's seat cabin aircraft using electroluminescent technology is now widely used in civilian handheld devices, mobile phones, pagers, cordless phones, personal digital assistants, remote control, etc. products, since the EL backlight mode with a small size, light weight, low temperature, low power consumption, no flash, light uniformity and other characteristics, has been gradually replacing the traditional way of LED backlighting.

EL backlight system is composed of EL lamps, and an EL driver. EL lamps typically have a thickness less than 0.2mm, the insulating substrate is sprayed and an electroluminescent material sandwiched between two layers of electrode composition. EL electroluminescent lamp provider can by using different luminescent materials, such as zinc sulfide, calcium or strontium sulfide, and then doped with other ingredients such as magnesium, samarium, europium or add fluorescent dye, etc., to adjust the brightness of the light and color. Changing the excitation frequency can cause the same color of the light changes, when the frequency increases to a bluish color change in direction, and when the frequency is decreased to a greenish color change in direction, EL light film is the original color of the excitation voltage is 200V / 400Hz when the EL lamps luminous color. QVGA lcd
EL lamps with strong flexibility, without the premise of electrode breakage, can be arbitrarily cut or bent without affecting the luminescent properties; moreover, EL lamp film is a "flat" transmitter relative to the LED light source, without light guide plate diffuser can achieve full-surface uniform light; addition, LED is a "hot spot" light, localized "hot spots" are often sophisticated electronic systems will bring unexpected interference, EL lamps is a cold light source. Relative to the LED backlight system, EL backlight system is another advantage of reducing power consumption. EL lamps require only a high voltage, load current required is very small, about the range of 0.03 to 1mA/cm2, in general, the EL lamp is less than 10 cm2 area, the operating current of several mA or so . However, only one LED on the drive 5 to 10mA of current. Low power consumption for battery-powered equipment, has considerable significance. Judging from the electrical characteristics, EL light sheet has a resistive and capacitive characteristics, the equivalent circuit shown in Figure 1, the capacitance is typically 2 to 6nF/in2 (EL lamp the better the quality the smaller the capacitance characteristics). Resistor is typically 50 to 15000KOhm/in2. EL driver circuit with a maximum drive size and brightness will vary depending on driving EL lamps which are quite different. EL lamp brightness piece is the combined effect of several electrical parameters. Generally, the driving voltage peak increases, increased brightness; driving voltage frequency increases, the brightness increase (up to a few thousand hertz when the frequency, the brightness will decrease gradually increases); on the other hand, the frequency of the drive voltage increases , EL light emission efficiency will be reduced sheet; course, EL light film of material, quality and structural efficiency of the light emitting brightness and also has a great impact, for example, EL lamps of different colors with different efficiencies, the green maximum efficiency. Furthermore, EL lamp brightness chip mapping unit is a reflection of active light sources fL (foot lamberts) or nits (cd/m2, cd / sq m), 1fL = 0.2919nits, instead of measuring the intensity of light reflected from an object Lux (lux ). serial 16x2 lcd

LED electronic TFT Display Module brightness control conversion technology

LED electronic display is composed of many independent pixels (light emitting element) arranged in due to pixel separation, determine its emission control and drive only in digital form. The light emitting state of these pixels are simultaneously controlled by the controller, independent drive. True color video display means on the brightness of each pixel is controlled separately, and to the required scan time synchronization to complete. Large screens are composed of tens of thousands of pixels, which makes the system more complex than the two values ​​are greatly increased in terms of large-screen displays, and overall a higher data transmission speed requirements. Each pixel is set to a conventional D / A is clearly unrealistic, must find a can minimize system complexity and the performance as high as possible solutions. lcd 128x64
By the vision theory know that people are feeling the average brightness of pixels can be determined by its on / off duty cycle. That is, as long as the pixel is lit on / off duty cycle adjustment, the luminance control can be achieved. For LED electronic display, this means that as long as the representative of pixel brightness light-emitting pixel digital conversion is time (D / T conversion), namely to achieve a brightness of D / A conversion.
That this pixel on / off duty cycle. Since the function f (i) in terms of all the pixels can be in common, and thus the above formula shows that, as long as f (i) of each pixel centralized control, can achieve full-screen independent of each other but all the pixels simultaneously to the D / T conversion.
Large-screen display driver circuit is usually a "serial shift + latch + driver" structure, in order to minimize data transfer cable. To full screen while achieving the above formula, as long as all unified by the ST signal f (i) control can be. Of course, doing so on the premise that requires the shift register is stored in the control data of each pixel in the same positions of power, and this can be done by pre-processing the data. 320x240 lcd display

Flat panel TFT Display Module using plastic optical film production technology

Optical diaphragm (filter) to enhance the optical properties of the product range is very kind, such as 122x32 lcd module / CRT Projection TV, VCR, CRT, CCD digital cameras, CD / MD / VCD / DVD optical pickup (pick up head ), liquid crystal display (LCD: Liquid Crystal Display), Plasma TV (plasma TV), field emission display (FED: Field Emitting Display), EL panel EL, optical lenses and so on. Among them, LCD flat panel display to improve the brightness, uniformity, color, perspective, it is necessary to use up to 5 to 6 or more kinds of high price of the optical film.
Conventional optical film in a vacuum state, the impedance heating deposition surface of the elongated film on a glass substrate; However, recently, most high-precision multi-layer optical film sputtering process to switch production (sputtring process). Length of the glass substrate surface membrane technology, because the film quality by the high degree of recognition, so long it has not been questioned production costs. With the reactive sputtering and vacuum technology and polymer resin coating tree diaphragm (plastic film) and long-membrane technology (referred to as Roll to Roll Technology) advances, high-precision multi-layer optical film of plastic material gradually into the mainstream market, and there are replacing the optical film glass trend. Among them, "Roll to Roll" long membrane technology than ever batch process (batch process) with a low-cost, high-capacity, high-precision, high stability, etc., so it is highly related to the future development of industry attention.
Due to the high deflection of the advent of plastic optical films, coupled with production technology and processing equipment advances, making these kinds of optical products are no longer limited by the optical film appearance, but whether it is cost side or the size, weight and process has thus been significantly streamlined. 240x64 lcd

The type of the light guide plate Character LCD Modules

Scattered light guide plate-type printing 20x2 lcd display
The traditional scattered light guide underside printing white shades (gradation) outlets scattered incident light, scattered light shades depending on the diameter of the dot density. Outlets from the UV adhesive material is titanium dioxide, barium sulfide mixed viscous liquid of the composition. Figure 3 shows the dot diameter of the light source is incident end is 250μm, which is away from the light source side end edge of the light guide plate dot diameter 1250μm. Use outlets scattered light emitted from the light guide surface, some of evasion from the light guide plate and the bottom side of the light guide plate is returned to being reflective film reflective light guide plate to the surrounding light guide. Located in front of the light guide plate diffusion film has two functions, namely the incident spread to the set of optical prism diaphragm; Another function is to dampen the surface of the light guide plate dot shape. Diffusion film-shaped top of the first sheet set of triangular cross-section prism film and the cold cathode fluorescent lamp at a right angle direction (y direction), the second prism sheet set and then the diaphragm at right angles to the laying of the first sheet, by the This special design closure xy direction of the light guide plate surface again while desalination dot shape and unique wedge-shaped light guide cross onyx (gray stripes).
Injection Molding scattered light guide
The specific method is the use of injection molding precision etching technology microfabrication mandrel into the dot shape, re-use plastic injection molding machine manufacture light guide. 40x2 lcd
Reflective Injection molding LGP
It is the use of ultra-precision processing technology in the production of micro-optics light guide plate bottom mirror reflection of light within the light guide plate, this approach may be due to the production method makes scattered due to disappear. Specific production step is injection-molded into a mold core microfabrication oblong micro-reflecting mirror surface (Micro Reflector; hereinafter referred to as MR device), and then making use of the light guide plate plastic injection molding machine, MR system located in the bottom guide plate of the guide light board is formed integrally

Optical Design Character LCD Modules

Geometry of the light guide plate and the luminance distribution is determined by the liquid crystal display manufacturers to design the light distribution of the light guide plate is usually utilized raytrace light guide plate, the shape of the light guide plate speculation intensity of light emitted. Total reflection within the light guide plate caused by a guide, so the light emitted from the light guide and can not fully satisfy this condition. For example, a flat plate-shaped light guide, for example, if the light is in full compliance with the conditions for total reflection critical angle of the emitted light does not exist, similar to the light guide plate of this type must be in the bottom of it and the front set MR device. 256x64 oled

The design surface of the backlight unit of the light intensity distribution, it is necessary for the MR, or MD optical design and simulation. Required when the optical design of the cold cathode fluorescent lamp into a diameter, length and shape of the lamp the parabolic reflection film and other parameters (parameter), with these parameters can assume that the surface of the backlight unit presumed light intensity distribution. They can also take advantage of LIGHT TOOL's backlight unit using optical design software, the estimated value for the light intensity distribution determines the location of MR or MD. 16x4 lcd display

Transflective Character LCD Modules screen reflection principle

LCD screen image is transmitted by the backlight to show through the color filters through before the window that catches our eye, which is equipped with backlight mode is called "transmissive" LCD screen backlight device power consumed by the majority of . Backlight brighter presented in front of the screen, the higher the relative brightness, however, the greater the consumption of electricity. "Reflective" architecture of the device via the reflector using an external light source to the display, this device but in the absence of an external power source is more difficult to see the picture. Character LCD Modules
"Transflective" type of compromise between the, this means a mirror (half mirror) to replace the reflective plate in addition to the backlight through the external light source can also be used outside of the reflection, to save power, to improve the brightness and weight effect. serial display modules

Character LCD Modules ODF Basics

ODF process is an epoch-making method of manufacturing a conventional time-consuming, low yield and difficult to achieve difficulties; such as the production of large panels of television products, in response to quick response of the small Gap panel, or by advanced high-quality MVA panel, the use of ODF process technology The problem can be solved. Graphic LCD Display
Use ODF process, we can get to them the advantages are:

Machine investment decline: the use of ODF process, we no longer need a vacuum annealing process, liquid crystal injection machine, sealing machine and after sealing panel cleaning equipment. Space and manpower savings: As the project a process referred to shrink relative to the manpower and space can be saved.

Material savings:

Generally, ODF process, the efficiency of the liquid crystal is 95% or more, but compared to the 60% of the conventional process, can save more than 35% full of liquid crystal materials. More savings and related panel sealing glue needed cleaning water, electricity, gas and lotion.
Manufacturing time reduction: Due process was originally saved the traditional manufacturing process of the most time consuming process, and with the trend of large panels, or small Cell Gap of high quality panels, time-consuming longer. Typically Cell processes in traditional practices still need to complete at least three days, but the ODF process, the less than a day to complete. Character LCD Display

Modular design of Character LCD Modules large screen display

TFT LCD Misplays large screen display due to its eye-catching, content, flexibility, etc., have been increasingly used in advertising, information dissemination, traffic signs and other public places, and achieved good results. LED display digital display is divided into two main numbers and dot-matrix display, this article discusses only dot matrix display. The current LED display basically start with the user requests, the manufacturer needs to be customized according to which, each time repeating design circuits and mechanical structure, resulting in a waste of resources, but if the user needs to change, alteration will be very difficult.
In fact, regardless of the size of the display, the principle is the same, so they could design a standardized, modular LED display, to be different, just proud of the corresponding module can be combined. This article describes is a modular LED display, you can change the size according to need to be flexible, and can be run independently from the computer, you can also achieve such as flickering, scrolling and other special effects.
Fundamental
The basic design idea is the same as the size of the entire screen is divided into several, same function display module, and the other with a central control module control, synchronous operation of all display modules, to achieve the overall coordination of the display.
Therefore, this system mainly consists of two parts: the display module and a control module.
The display module is the same actual size of a small LED driving board, to drive the LED array, a basic display, and can receive data from the control module and commands used in addition to some of the display, such as blinking, scrolling, also included in the display module. Existing GB lattice Store with 16 × 16 and 24 × 24 two kinds, taking into account the convenience of writing software and hardware capabilities, we display module as a 16 × 16 matrix size.
The control module is responsible for controlling each display module, each display module to send data and commands. Control module lattice data stored information to be displayed, timed to each display module downstream. The control module also comes with a small keyboard and a universal asynchronous serial port, which you can use the keyboard can also be controlled by computer, you can also use computers to update the data within the control module.
Between the display module and the control module connected with the bus, we have selected the I2C bus.
The system designed for use with a great degree of freedom: the control module controls the display of the number of modules can be changed, the arrangement of the lcd graphic display can be changed (such as the display module 16 can be either 2 × 8 may also be 4 × 4) , with a display on certain conditions, the use of information can be stored separately show the lattice size of each message can be different than the screen size information can scroll displayed. So essential to meet diverse needs.

Capacitive touch screen can be divided sanliujiudeng Character LCD Modules

From mobile phones, tablet to a laptop, to one computer, smart TV, touch-screen electronic products has become nowadays the most popular elements of this popular trend is changing the way people live. Before we advocate physical buttons - both T9 or Qwerty, but as technology advances and matures, nowadays already a "no touch is not" big screen mobile phone era. The phone body, touch of maturity has basically been close to or even surpass the traditional physical keys, which also accelerated the demise of physical buttons mobile phone, and the same as the main mode of operation is based on touch tablet also squeeze the traditional PC market. lcd graphic display
Touch the merits of the points
Up to the folks down to Treemass young people have begun to use electronic devices with a touch screen and enjoy a more intuitive and convenient operation, but at the same time accompanied by another phenomenon: even if the hardware configuration has been reached the smooth running system requirements of the application, but the user does not have any sense of smooth, like a number of cottage manufacturers price is very attractive Android phones, although sometimes high but its configuration fluency but not with the hardware Structure proportional - Caton phenomenon has become a short board to touch.
Touch-screen human-computer interaction is a necessary link, so it's sensitivity and response speed is especially important to be purchased and used by the majority of manufacturers capacitive touch screen is the most mature stage of application solutions, the appearance of seemingly identical " transparent "inside the panel was a great tide, touch a direct result of human-computer interaction process smoothly or not.
Capacitive touch screen structure is like a sandwich on a plate, "plate" closest to the electronic equipment electrical components, it has played a role in shielding the electrical signals to avoid interference on touch screen; and "plate" contact , as well as the top of the "bread layer" for the non-conductive (dielectric) of glass, they are more protective effects; two "bread layer" middle of the clip of the "sauce" is the most critical ingredients, it responsible for the induction electric field and detects human touch point, an electronic device can be used to give users a smoother experience, it depends entirely on the "sauce" to taste it. Low Temperature Display

Capacitive touch screen works and sensitivity oled module

Capacitive touch screen driven by the internal electrodes and receiving electrodes, the driving electrodes by a low voltage high frequency signal onto the receiving electrode form a stable current to the capacitive touch screen, when the body, due to body ground, the fingers and the formation of an equivalent capacitance screen capacitors, the high frequency signal flows through the equivalent capacitance of the ground, whereby the charge received by the receiver decreases, and when the finger closer to the transmitter, the charge decreases, the more obvious the last received by the receiving end The current intensity to determine the touch point. As for multi-touch, simply put, is to block the screen, in every region of each mutual capacitance module works independently, so the capacitive screen can independently detect regional touch case, for processing After multi-touch. Character LCD Module
Sensitivity
In the middle of "sauce" capacitive touch screen determines the sensitivity and response time. Affect the sensitivity of which is something called a contact diameter. We can be a capacitive touch panel is divided into a sharing of tiny area, and two close contact diameter is the distance between the centers of regions, the smaller the contact diameter, the higher recognition rate of the touch screen, for example, some touch needs of the entire area of ​​the belly of a finger pressed to recognize the signal, while others only need fingertips.
Take now the latest Windows 8 operating system, Microsoft Win8 touchscreen official contacts required minimum diameter is 9mm, which means that we use the touch screen when you want to compare your finger on the screen, pressing firmly to ensure contact area. If 9mm diameter as measured by this standard, then, in some cases, the system may not recognize the swipe gestures, for example, you take your finger contact area than small capacitance pen to write on the touch screen display handwriting but only intermittently, even with no response, so the smaller the diameter represents the touch contacts more outstanding. graphic lcd display module

4K Character LCD Modules TV in what is meant

4K resolution is the emerging digital film and video resolution standard, specifically refers to 4096 × 2160 pixel resolution, due to its vertical resolution of 4096 pixels approximate value of 4000 (4K), it is also known as 4K resolution. 4K resolution, up to 8.8 million pixel screen, with movie-level quality, belonging to the resolution of standard Hollywood blockbusters, with a resolution of 2K and 1080p HDTV projector 4 times, so they are ultra high resolution category. TFT LCD Module
In the field of digital technology in general, K is the number of pixels as a unit, i.e. 1K = 1024,2 K = 2048, so 4K represents a horizontal direction, an image having 4096 pixels. And we are talking about 4K resolution is 4K × 2K, ie 4096 × 2048. So why do we usually see 4K TV resolution than 4096 × 2048, 3840 × 2160 but it? This is due to the industry standard of different causes, such as the film industry common Full Aperture 4K resolution of 4096 × 3112, Academy 4K resolution of 3656 × 2664. In the field of home appliances, according to the International Telecommunications Union (ITU) defined criteria, 4K resolution of 3840 × 2160, 16:9 aspect ratio. At 4K resolution, up to 8.8 million pixel screen with a resolution of 1080p HD TV 4 times, so they are ultra high resolution category.
Currently, 4K resolution, device manufacturers started to become the focus of chase, but the vast majority of 4K products are expensive and not in the mass range of consumers can afford. At the same time, since the construction is relatively stagnant 4K resolution content, standards-compliant digital content is not rich, which is 4K resolution limit further spread of the important reasons. If consumers want to buy products compatible with 4K resolution, yet need to make digital content is not fully prepared. Character LCD Display

ITO arrangement of atoms and grain Character LCD Modules

In most occasions, the chemical etching method is the most mature and prepared ITO graphics viable technology, it can according to your needs, to generate sufficiently fine patterns and the current relatively small upfront investment. With deep UV technology in the exposure device applications, micron precision, most manufacturers have already been achieved. It has high efficiency, good stability and reproducibility batch, equipment investment is low, supporting technology improvement and many other advantages, is still the main direction of large-scale production, the use of raw materials etching cream, resist ink, photoresist three.
1, the etching cream craft
Chemical etching of the following ways: one is directly outside the area of ​​the electrode pattern of the product printed etching paste, etc. After completion of the reaction, the etching paste solvent, typically water clean, leaving the desired electrode pattern. In this way for a number of line width and line spacing requirements of 0.2mm or more photoelectric products such as low TN display, resistive touch screens, capacitive touch screens, solar batteries, because you do not spend a lot of chemical, a smaller impact on the environment pollution , save a lot of water, electricity, venue costs, low upfront investment costs, the general printing industry can master most of the technical and other factors, there is growing momentum of development. Its main point is that the temperature control for etching speed control, the design should take full account of the edge effect on these two points, generally with a relatively simple workshop field experiments, you can get ready to compare the parameters.
2, the resist ink technology
Chemical etching the second method, just the opposite with the first, which is area of ​​the electrode pattern in the printed product is protected by the resist ink, and the product immersed in a chemical etchant, so that products outside the area of ​​the electrode pattern portion and Chemical After complete reaction the etching solution, and then the resist pattern of ink from the surface of the electrode peeled product, an electrode pattern is formed product. Its width and line spacing be 0.08mm, still more than 95% yield of the etching. This approach PCB circuit boards, membrane switches, resistive touch screen, photovoltaic cells and other products, the current occupy the mainstream position.
According to the last strip to go different ways, resist ink divided into physical and chemical solution peel-peel type. Wherein the physical strippable resist ink, in addition to preparing graphics for use in the production of electronic products, and more is on the product surface protection to prevent external damage product, isolated environment outside of water, electricity, gas, preventing them from corrosion products . Among the most widely used in the electronics industry is the circuit board insulation adhesive, and the touch screen surface protection in the production of rubber. 320x240 lcd
Since the physical strippable resist ink, if the product transfer order process, the need to remove it, is the use of physical force tear strip, so generally it's screen thickness requirements in the chemical solution strippable resist printing ink to the thickness of the two more than three times, and the degree of cure, as the chemical solution is not exfoliated resist ink, as long as to reach the surface curing, also requires must be completely cured, so that the subsequent processing in the production process, the edge portion will not be squeezed pressure and deformation and fracture, the need to remove it, resulting in residual edge. In the production process of the touch screen, the edges of the surface protective adhesive residues affecting the production efficiency and quality of the yield of the main factors.
Exfoliated resist chemical solution inks, at last peeling in different ways, one is also divided into dissolving, one is expanding type. Two are in the etching effect is no different, just peel the cleaning process, dissolving the resist ink does not require alkali, alkali concentration on some of the more sensitive products more suitable, its drawback is that in order to improve the silkscreen ink performance, added some filler to increase the ink in the ink viscosity and styling capabilities, these fillers will dissolve the peeling process, due to the Coanda effect, dependent on the product surface residues, are more difficult to clean. These shortcomings of the expansion type does not appear in the ink, but the ink intumescent strip, the higher the concentration of alkali, and after peeling the ink flaky, the peeling device lye circulation system, to there is a corresponding filtering and quarantine measures to avoid blocking pipes and repeat polluting products. lcm module
Resist ink key parameter is the pinhole and viscosity, are generally produced as line width 0.08mm or more products, the general pinhole can meet the requirements, so the actual production process, the main concern is the change in viscosity .

Chemical etching method for preparing ITO pattern Character LCD Modules

Currently the most widely used industry ITO film, mostly using the magnetron sputtering method produced. Magnetron sputtering ITO layer generated, can be understood as a number of individual atoms or groups of atoms are oxidised to form a thin film stacked together, so a macro sense, it can be understood as having isotropic properties, that is, optical, electrical, chemical and other properties, and is basically the same in all directions. This feature allows the ITO film during chemical etching, the chemical reaction in each direction are the same, to obtain a good pattern reproducibility. The edges of the graph because even three to five times over etching time, and only in a few hundred to several thousand angstroms edge loss of lateral erosion area above the line for the micron, the angstrom tolerances can be completely ignored. 122x32 lcd
ITO layer is understood as the isotropic characteristic macroscopic point several occasions stressed that ITO is a non-crystalline structure such as keys embodied anisotropy is completely different concept, emphasizing its crystal structure, is to emphasize the microstructure representation on the stability of this stability can be specifically describe some of its physical and chemical parameters are relatively constant value, but from a macro perspective, ITO can not really become a complete structure of the crystal structure. 192x64 lcd

ITO film production methods TFT Display Module

1, vacuum magnetron sputtering 8x2 lcd display
During the sputtering process, in the case of the high oxygen flow rate, from the target to bombard the metal In, Sn atoms in the vacuum chamber or the substrate surface and oxygen react sufficiently In2O3 and SnO2
2, screen printing or ink-jet printing method
Currently only silkscreen method Sumitomo practical technology for use on the company's own products, is said to be better quality than the traditional way. ITO microcrystalline powder formulations generally use a more reasonable way to produce screen printing, nano-ITO powder formulations can be used to find an inkjet printing method.
This approach undoubtedly the highest production efficiency, in most cases, eliminating the need for subsequent etching process, directly produce the desired pattern ITO transparent electrode, is the future direction of the main research and development.
3, the semiconductor process Lift-off approach
The PET film substrate may alternatively be printed on the first negative type pattern, followed by ITO coating, and finally the removal of printing ink. display lcd 16x2

LED technology and homogeneity of the substrate Si substrate TFT Display Module

Si substrate
Si substrate is seen as reducing the cost of Character LCD Display epitaxial wafers ideal choice because of its large size (8-inch, 12-inch) substrates grown the most mature. However, since the lattice mismatch and thermal mismatch is too large, difficult to control, based on the Si substrate of the LED material quality is relatively poor, and the yield is low, so the Si substrate on the market for LED-based products are very rare. Currently grown on Si LED is mainly used to 6 inches below the substrate main factors to consider yield, based on the actual costs and the LED sapphire substrate compared to the non-dominant. And SiC substrate, the majority of research institutions and manufacturers more popular in electronic devices grown on Si substrates instead of LED. Future of LED epitaxial Si substrate technology should aim at 8 inches or 12 inches this larger substrate.
Homogeneous substrate
As previously mentioned, the LED epitaxial growth is still mainly hetero epitaxial substrate. But the lattice matching and thermal homogeneity matching crystal substrate is still seen as improving the quality and performance of the LED final solution. In recent years, with a hydride vapor phase deposition (HVPE) epitaxial technology, the thickness of the GaN-based substrate, a large area production technology gained in importance, its production method is generally used on a foreign substrate HVPE grown rapidly obtain several tens to hundreds of microns thick GaN material, and then using mechanical, chemical or physical means to a thick layer GaN film was peeled from the substrate, the use of a thick layer of the GaN substrate, the TFT LCD Misplays epitaxial.

LED technology of epitaxial structure and extension techniques TFT Display Module

(1) Droop effect
After several years of development, LED epitaxial layer structure and epitaxy technology is relatively mature, the internal quantum efficiency of up to 90%. However, in recent years, with the rise of high-power serial display modules chips, LED injection under the big decline in the quantum efficiency has aroused wide concern, this phenomenon is vividly called Efficiency Droop. The industrial sector is concerned, can guarantee to solve Droop in power under the premise further reduce the chip size, to reduce costs. For academic purposes, Droop effect is to attract scientists to study the cause of the hot spot.
Unlike conventional semiconductor optoelectronic materials, GaN-based LED Efficiency Droop causes are complex, and the corresponding lack of effective means of settlement. After exploring the researchers to compare tendencies are several reasons: the carrier localization solution, carriers from the active region of the leak or spill, and Auger recombination. Although specific reason is not clear, but it was found that using a wide quantum well to reduce the density of carriers and optimization of the p-type electron blocking layer region is a means to relieve Droop effect.
(2) quantum well active region
InGaN / GaN quantum well active region is the core of LED epitaxial materials, growth InGaN quantum well is the key to control the quantum wells stress, reduce polarization effects. Conventional growth technology include: low MQW In composition of InGaN growth before the pre-stress release well as carriers and tanks, heating growing a GaN barrier layer to improve the crystal quality of the barrier layer, the growth of a lattice-matched barrier layer InGaAlN or growth stress complementary InGaN / AlGaN structure. The number of quantum wells is no uniform standard, the industry uses the number of quantum wells from 5-15 have, the final result is not very different, a small number of wells in a small injection under the Graphic LCD Module is more efficient, while a few more wells The LED in the large injection efficiency.

Look through these LED technology Character LCD Modules

p-type region
The p-type doped GaN is an important early distress Character LCD Modules production bottlenecks. This is due to unintentionally doped GaN is n-type electron concentration above 1 × 1016cm-3, p-type GaN is more difficult to achieve. By far the most successful p-type dopant is Mg, but still face high doped lattice damage caused by the main reaction chamber easily passivation problems H elements. Shuji Nakamura of Nichia Corporation invented the oxygen annealing method is simple and effective, is a widely used method of activation by the Lord, but also manufacturers directly by MOCVD activation annealing furnace with nitrogen reign. Nichia's p-GaN quality is the best, probably related to atmospheric pressure MOCVD growth process.
In addition, there are some use p-AlGaN/GaN superlattice, p-InGaN/GaN superlattice reported to increase the hole concentration. However, p-GaN hole concentration and the hole mobility and the n-GaN is still a great difference compared to the electron, which results in a LED asymmetric carrier injection. Generally required in quantum wells near the p-GaN side of the insertion of p-AlGaN electron blocking layer. But between AlGaN and the quantum well region mismatch polarity is considered to be caused by leakage of the main carriers, so recently some manufacturers try and p-InGaAlN instead.

No single-chip white LED phosphor
Mainly uses existing white LED blue COG LCD Display  and yellow phosphor combinations emit white light, this white typical CRI is not high, especially for the red and green reproduction capability is weak. In addition, the phosphor is also facing such as poor reliability, efficiency losses and other issues. Completely dependent on InGaN material as a light emitting region in a single chip to achieve white light from a theoretically feasible.

Serial Interface Chinese dot matrix Character LCD Modules interface mode and timing

OCM4X8C with serial / parallel interface to a variety of ways to facilitate the module with a variety of microcontroller, microprocessor connection.
(1) 4/8 bit parallel interface mode
When the module PSB feet high, the module enters the parallel interface mode. Can function in parallel mode setting command "DL" to select 8-bit or 4-interface mode, the main control system will cater for "RS", "RW", "E" DB0 ~ DB7 to complete the instruction / data transmission, its operation timing and other parallel interface OLED Display is the same.
(2) 2/3 wire serial interface mode
When the pin to low PSB module, the module enters the serial interface mode. Serial mode uses a serial data line and a serial clock line SCLK SID to transmit data, constitute two-wire serial mode.
OCM4X8C also allows simultaneous access to multiple LCD module to complete the multi-information display. At this point, you want to take advantage of chip select "CS" a 3-wire serial interface mode, when the "CS" then high potential, the module can receive and display data properly, otherwise the module displays will be banned. Typically, when the system uses only one liquid crystal display module, "CS" may be connected and fixed to a high level.
Microcontroller and LCD module 1 byte of data transferred between the total of 24 clock pulses. First, the single-chip data transmission to give the start bit, here are five consecutive "1" as the start bit of the data, such as the module receives a continuous 5 "1", the internal transmission is reset and the serial transmission will be synchronized. Then, "RW" bit is used to select the direction of data transfer (read or write), "RS" bit is used to select the internal data registers or the instruction register, and finally the eighth bit is fixed to "0." Upon receiving the start bit and the "RW" and "RW" The first one byte, the next byte of data or instruction will be divided into two bytes to the serial transmission or reception. Data or instructions, the upper four bits are placed in the first two bytes of serial data high 4 bits of the lower 4 bits are set to "0"; data or instruction is placed in the lower 4 bits byte 3 The high 4 bits of the lower 4 bits are also set to "0", so that completion of one byte command or data transmission. It should be noted that, when there are multiple data or instructions to be sent, it must wait until an instruction completes execution is completed before sending the next command or data, otherwise, it will cause an instruction or data loss. This is because the internal TFT Display Module does not send / receive buffer.
The module is constituted by a program with the same type LCD dot matrix LCD module compared, regardless of the hardware circuit structure or display program to be much more simple, and the prices are slightly lower than the same module graphic dot matrix LCD module .

Serial Interface Chinese dot matrix Character LCD Modules Application Note

low temperature lcd module with OCM4X8C should note the following:
① wishing to display Chinese characters in a certain position, you should first set the display character position, which is to set the display address, and write Chinese character encoding.
② Display ASCII characters and display Chinese characters during the same procedure. However, successive characters in the display, simply set the time display address, an address by the module automatically add a point to the next character position, otherwise, there will be a display of characters ASCII null character position.
③ When the character is encoded as two bytes, high byte should be written first, and then write the low byte.
④ 128x64 oled module receives instructions prior to the processor inside the module must be confirmed in a non-busy state, that is required to read the BF BF flag is "0", before they can receive new instructions. If not checked before sending a command BF flag, the previous instruction and the instruction must be delayed for a longer intermediate period of time, that is determined to wait for the previous command execution is completed. Please refer to instruction execution time of the instruction sheet instruction execution time instructions.
⑤ "RE" as the basic instruction set and extended instruction set control bit. When you change the "RE", all subsequent instruction set will be maintained in the final state, unless it is changed again "RE" bit, otherwise use the same instruction set, without resetting each time "RE" bit.

Serial Interface Chinese dot matrix Character LCD Modules module applications

Liquid crystal graphic lcd display module  device having a display as information-rich, low power consumption, small size, small, no radiation, etc., are widely used; but the LCD display module complex hardware interface and software programming has forced product designers intimidating, and thus The module limits in certain areas of application.

Features
OCM4X8C is a serial / parallel interface with internal containing Chinese character dot matrix LCD modules. The module's control / driver adopts Taiwan Sitronix company ST7920, which has a strong control display. OCM4X8C LCD display is 128 × 64 dot matrix, can display 4 lines of 8 characters. In order to facilitate a simple and convenient way to display Chinese characters, the module with 2Mb of Chinese fonts CGROM, the font ROM contains 8192 16 × 16 dot matrix Chinese font; Meanwhile, in order to facilitate the English and other commonly used characters display, with 16Kb of 16 × 8 dot matrix ASCII character library; to facilitate construction of graphical user provides a 64 × 256 lattice GDRAM drawing area, and in order to facilitate construction of fonts required by the user, provides four 16 × 16 dot matrix made word space. With the above features, OCM4X8C can be realized characters, ASCII code, bitmap graphics, self-made fonts with the screen display. For ease up and a variety of microprocessor, microcontroller interface module provides four parallel 8-bit parallel, two-wire serial, three-wire serial interface to a variety of ways.
The module has a 2.7 ~ 5.5V wide operating voltage range, and has a sleep, normal, and low-power mode, the system can meet a variety of operating voltage and low power requirements portable devices. LCD module shows a negative voltage is also provided by the module, thus simplifying the system power supply design. Module also provides LED backlight display. In addition, the module also provides a clear picture, the cursor display / hide the cursor, display on / off, display character blink, cursor shift, display shift, vertical screen rotation, highlight display, serial 20x2 lcd Sleep / Wake , turn off the display and other operations command.

Simple definition of photovoltaic materials describing TFT Display Module

Optoelectronic material definition optical material is used to manufacture a variety of optical devices (including a variety of active and passive optical sensor optical information processing and storage devices and optical communications, etc.) of the material. Optical materials include infrared materials, laser materials, fiber materials, nonlinear optical materials. OLED Display

Infrared materials are mainly two types of military infrared materials: Materials infrared detection and infrared wave-transparent materials.
Infrared detection materials: infrared detection materials include lead sulfide, antimony, indium, germanium-doped (gold, mercury), tellurium, tin-lead, mercury cadmium telluride, sulfuric three glyptal, tantalum, lithium, germanium, lead acid, magnesium oxide and a series of materials, InSb and HgCdTe infrared photovoltaic systems are currently used in military primary infrared detection materials, especially mercury cadmium telluride (Hg-Cd-Te) materials, is the current national focus on the more mature research and development is the main infrared materials. It can be applied from the near-infrared, mid-infrared, far-infrared to a wide wavelength range, but also having photoconductivity, photovoltaics, and other work photomagnetoelectric manner advantages, but there are also chemical stability of the material is poor, large size single crystal is difficult to be made, a large area defects and poor uniformity, large area array limiting device development, Hg-Cd-Te thin-film material is now in development and application stage, in order to overcome the above disadvantages of the material, the international explore new technical ways:
(1) Preparation of a variety of large-size thin epitaxial wafer, these techniques including molecular beam epitaxy (MBE), liquid phase epitaxy (LPE) and metal organic chemical vapor deposition (MOCVD), etc. Can be prepared by MOCVD, in particular large-area, homogeneous composition, the surface state is good Hg-Cd-Te thin film, for the preparation of large area focal plane array infrared detector. Foreign law has been made by MOCVD area greater than 5cm2, good uniformity, Δx = 0.2 ± 0.005, reproducible process mercury cadmium telluride single crystal thin film, 64 × 64 FPA has been used in model systems, 512 × 512 already sample.
(2) find new high-performance materials to replace the infrared Hg-Cd-Te, including:
① Hg-Mn-Te and Hg-Zn-Te, the United States and Ukraine, and other countries from the mid-1980s has carried out research in this area, studies show, Hg1-xZnxTe and Hg1-(x + y) CdxZnyTe optical properties and cadmium telluride Mercury very similar, but easier to obtain a large size, low defect single crystal, chemical stability is higher. Hg1-xMnxTe is a magnetic semiconductor material in a magnetic field and HgCdTe photovoltaic properties is almost the same, but it overcomes the Hg-Te problems caused by weak bonds. Studies show that the Hg1-xMnxTe, when x <0.35 can be obtained when the composition uniformity, the large size of crystal, the application in the far infrared region, the x-value of about 0.11 should be selected.
② high-temperature superconducting materials, is now in the research and development stage, has developed successful products.
③ Ⅲ-V compound superlattice materials can be used for 8 ~ 14μm infrared detectors, such as: InAs / GaSb (strained layer superlattice), GaAs / AlGaAs (quantum well structure) and so on. I2C Lcd Display
④ SiGe material, due to SiGe material has many unique physical properties and important applications, and is compatible with Si planar process, thus causing the microelectronics and optoelectronics industry's attention. SiGe material by controlling the thickness, composition, strain, etc., can freely adjust the optical properties of materials, opening up a silicon bandgap engineering artificial design and a new era, the formation of an international research boom. Si / GeSi heterostructures used in infrared detectors have the following advantages: cutoff wavelength in the range of 3 ~ 30μm greater adjustment, to ensure a cutoff wavelength of the detector response and help to optimize the cooling requirements. Si / GeSi material has the disadvantage that the quantum efficiency is very low, the current using a plurality of the SiGe layer to solve this problem.

Temporary lighting on the mobile phone application oled module

Mobile phones offer features LED lighting is generally considered fairly sophisticated design, composed of many flashlights now by the number of teeth low power LED, and through a relatively low 20mA to 60mA current driving the trend can be seen. Such lighting can be used as a portable flashlight, but it's faint illumination intensity on the support of the dark environment, but significantly less motion pictures, in fact, must have one or more high-power LED to support one meter or farther objects shooting lighting hinder engineers use high-power LED main reason is cost, but in the Taiwan Area and the Korean manufacturers gradually increasing power COG LCD Display production capacity, we can expect price will begin to decline.
High power flash with LED
The lighting and the flash mode is usually used with different current driving time, for example, can be used in the lighting mode, a continuous current of 200mA, and the flash mode is used to 400mA 1A, pulse current, pulse duration of the flash of the camera module according characteristics, and generally between the flash pulse width between 20ms to 200ms, the flash driver circuit to support the flash LED drive current of about 1A, providing up to 4.9W output LED, the LED junction temperature is maintained at the maximum capacity of the range, the temperature must be well management strategy, the pulse width narrow help reduce unnecessary consumption, while a large ground contact area of ​​the heat from the custom lcd is a preferred way to export.

10bit grayscale Character LCD Modules panel high above

In terms of the ability to display, 10bit driver IC seems to be required in the future to meet this regard, while the development of the next generation of driver IC can also come to an end. However, the fact is not the case, the driver IC industry is still actively preparing a new generation of technology, because Source driver IC output voltage resolution capability can be improved, then more than RGB color 10bit 20x2 oled panel, may also be made out, for example, from 2006 onwards, including Oki and NEC Electronics, they began selling 13bit and 12bit respectively the Source Driver IC samples. Some may be high above the 10bit gray scale capability to question the liquid crystal panel, the output voltage will be that even with the higher resolution capability of the driver IC, if the liquid crystal molecules with the deviation of each pixel, if more than the control precision of gray , then the end is still to no avail.
Therefore, compared with the reality, it seems that the Source 13bit and 12bit driver IC meaningfulness big, but this aspect of the product development industry does not think so, including Oki and NEC Electronics developed the Source 13bit and 12bit driver IC's intentions, not to achieve beyond 10bit grayscale display, but in order to make 10bit grayscale image displayed more clearly, that want to be able to pass higher resolving power of Source Driver IC for more precise control of RGB GAMMA features, and to up to compensate for backlight, color filter deviations caused by the object in RGB color registration errors. Because the panel is a backlight character oled display  the optical film, and so a combination of components, a component of any difference of the panel display capabilities are affected, resulting in varying degrees in RGB color registration error occurs, so that even with the 8bit Source Driver IC, for the panel, the panel does not necessarily guarantee equivalent to the output 8bit grayscale images.

Dithering technology is gradually being adopted industry oled module

The introduction of the liquid crystal panel of the product, and sometimes not used to increase the output voltage of the Source driver IC, but the use of simulation methods to improve the gray scale, is an area of ​​use and the time dithered dithered. Area tone is summed together a plurality of pixels, wherein the lighting by changing the tone of the pixel to control the way. Dithering etc. is also known. On the other hand, is a high-speed switching time dithered multiple images to be displayed as an image of the way. Also called FRC (frame rate control). LCD TV, the most recent being the relationship between performance improvement panel, although both use the 8bit Source Driver IC, however, there are more and more industry in such a way to increase the ability of the panel to grayscale display. lcd graphic display modules

Because by the new generation of output interfaces into effect in quantity, LCD TVs use 10bit driver IC phenomenon more and more, so for the driver IC industry, it also formally 10bit driver IC products as production mechanism . Because, as described above, prior to 2006, the overall panel industry to use 10bit driver IC ratio is not large, in general, the use of 10bit driver IC panel in the application for a proportion of LCD TVs is quite small, large part of the driver IC using 10bit panels are used for medical or display the CAD equipment, and the proportion of the industry, the medical or CAD proportion of the display device is minimal, almost impossible to cause driver IC industry the production 10bit driver IC interest. Therefore, in line with the overall environment, the trust 10bit driver IC demand will rapidly increase and attract the mass 10bit driver IC industry after the 10bit driver IC that costs will rapidly decline. lcd modules

Grayscale panel case is still in the chase oled module

Therefore decided to display the product's performance capabilities, and ultimately decided on the performance of the panel itself. Because no matter how good the display, showing how the internal use of high-end products arithmetic processor, when the display richer grayscale image, if the panel itself does not have a high degree grayscale display capability, so good display, high computing processors are no longer meaningful sex. If you look for panel multi-grayscale of study will find that it shows in terms of capacity, the 256x64 oled there is a considerable degree of room for improvement, because including plasma panel, DMD display components, etc., as opposed to the LCD panel, in the performance technical capabilities have been considerable lead, and the panel is still in catch-up situation.
Because of the panel will be different, gray scale display capabilities are different, which is the gray scale of the control principle is completely different reasons. The liquid crystal panel is a liquid crystal molecule alignment according to the different angle, the light flux from the control worn through. That is, the panel is a liquid crystal alignment according to the angle to determine the brightness of the display, and wish to improve the control of the alignment angle of the liquid crystal is very difficult. And the corresponding response, plasma panel, DMD display components, etc., is itself only shows 0 (black) or 1 (white) two brightness values. So you can take a picture of change during the (usually around 16.7ms) emitting pulses to control the brightness, which is the so-called "pulse amplitude" approach. Simple terms, just need to increase the luminous detail can be separated grayscale performance ability, therefore, compared with LCD panels, plasma panels, DMD and other grayscale performance capabilities for superior LCD panel also compared.
And on the circuit part of the explanation is that the 128x32 oled grayscale display capability is responsible for controlling the alignment of liquid crystal molecules Source Driver IC, their analytical ability to determine the output voltage, that panels can increase the number of gray scale capability, is determined by the driver IC. Now on the market, the mainstream driver IC with 6 ~ 8 bit resolution capability, mostly multi-panel TVs are using 8bit driver IC, but I believe in the years after 2006, 10 bit driver IC will gradually be applied to the liquid crystal TV panel.

Next generation FPD panel TFT Display Module finesse

For the graphic oled color of human pursuit, has not stopped since. Until recently because of the development of multimedia computers, to enable consumers to enjoy digital multimedia, the requirements for color, it is from from the original 16 colors, 256 colors has to support 8bit color performance. Now, with the digital storage of the data quality requirements increase, the latest high-definition movie storage standard HDTV, the provisions of each color to 10bit color that is 30 bit true color to save color images. When people saw a billion colors, the color will be more smooth and delicate, bright colors richer and more accurate reduction can also be objects in real colors than conventional 8bit color increased by 64 times, while the bright colors and rich staggering extent.
To now, the market is the most common panel grayscale performance capabilities mostly 6bit, so the color gradation processing can only reach 2 ^ 6, meaning a single color for the panel as a whole can only reach performance levels 64 levels, while the three RGB colors combined overall performance degree and only 262,144 colors, do not say that in the face of HDTV or SDTV, etc. HD content playback, and even expect to be able to meet the computer 32bit color scale, will not reach full capacity to support. Although it is technically possible to do by way of this process so that the panel can be simulated to 32bit color depth performance ability, but ultimately is to simulate the performance of actual experience, and still have a fairly large and CRT gap.
Because of this, it can support 8bit panels have been developed to, and to start on the market, to the full, demanding consumers of color. The ability to view color performance, 8bit panel color performance can reach 167,000 colors, but this and the 32bit color depth, or there is a gap, of course, they can not achieve HDTV for each RGB color 10bit grayscale requirements. So in the face of HDTV broadcast era, the development of 10bit panel and can be reached commercialization, it increasingly urgent. low temperature 128x64 lcd

Inductor detection methods and experience oled module

1 color code inductor detection
Place the multimeter R × 1 block, red, black pen color code each received either an inductor terminals, then the pointer should be swinging to the right. According to the measured resistance value size, specific identification of the following three conditions: Lcd display module 
A. color code inductor measured resistance value is zero, the internal short circuit fault. B. measured DC resistance of the inductor color code the size of the inductor coil wound enameled wire diameter used, the number of turns wound directly, as long as the resistance value can be measured, the measured color code may be considered a normal inductor The.
(2) the detection of the transformer in the week
A. The multimeter dial to R × 1 block, in accordance with the windings of the transformer in the week pinout law, one by one check each winding off the situation, and then determine whether it is normal. B. Detection insulation
Place the multimeter R × 10k block, do the following test several states:
(A) between the primary winding and the secondary winding resistance value;
(2) the primary winding and the resistance value between the shell;
(3) secondary winding resistance value between the shell.
The results of these tests appear in three ways: lcd graphic display modules 
(1) resistance is infinite: normal;
(2) resistance to zero: a short-circuit fault;
(3) less than infinite resistance, but greater than zero: a leakage fault.

Tests and experience capacitor oled module

1 fixed capacitors detection
A little less than 10pF capacitance detection
10pF capacitors due to the following fixed capacity is too small to measure with a multimeter, only qualitative check whether there is leakage, an internal short circuit or breakdown phenomenon. Measurement, the choice of a multimeter R × 10k block, respectively, with two tables document any two pins connected to the capacitor, the resistance should be infinite. If the measured resistance value (pointer to the right swing) is zero, then the capacitor leakage or damage to the internal breakdown. B detection 10PF ~ 001μF capacitor whether there is a fixed charge phenomenon, and thus determine its quality. Multimeter choose R × 1k block. Two transistors of the β values ​​are above 100, and the through current is smaller. Other models can be used 3DG6 composite pipe composed of silicon transistors. Multimeter red and black pen, respectively composite pipe and collector emitter e c phase. Because composite triode amplification, the measured capacitance charging and discharging process is amplified, so that the meter pointer swing rate increase, and thus easy to observe. It should be noted: In the test operation, especially in the smaller capacity measured capacitance, measured capacitance pin to repeatedly exchange contacts A, B two points can clearly see the multimeter pointer swing. C For more than 001μF fixed capacitance, available multimeter R × 10k block directly test whether the process of charging the capacitor and the presence of an internal short circuit or leakage, and according to the size of the pointer to the right to estimate the magnitude of the swing capacity of the capacitor.
(2) Detection of electrolytic capacitor
A Because of the electrolytic capacitor capacity is much greater than the average fixed capacitance, so measurements should be the appropriate choice for a range of different capacities. According to experience, the general case, 1 ~ 47μF capacitance between the R × 1k block can be measured, is greater than the capacitance of 47μF R × 100 block can be measured. 128x64 lcd display
B will then negative Multimeter red pen, black pen then positive, in the fourth year of the moment, the larger the meter pointer that is deflected to the right skewness (for the same electrical barrier, the greater the capacity, the greater the swing), then gradually turn to the left until it stops at a certain location. At this point the resistance is positive electrolytic capacitor leakage resistance, this value is slightly larger than the reverse leakage resistance. Practical experience shows that the electrolytic capacitor leakage resistance should normally be in the hundreds of kΩ or more, otherwise, it will not work properly. In the test, if the forward, reverse, no charging phenomenon that hands do not move, then disappear or internal circuit capacity; if the measured resistance is very small or zero, a large capacitor leakage or breakdown damage, can no longer be used. C For positive and negative signs of unknown electrolytic capacitors can be measured using the above method to determine the leakage resistance. That is, first measuring about any leakage resistance, remember its size, and then switching table pen then measure a resistance. Two measurements is the resistance of a large positive connection that time, namely the black pen then is positive, the red pen then is negative. D Use a multimeter power block, using a electrolytic capacitor, the reverse charge method, based on the size of the pointer swings to the right, you can estimate the capacity of electrolytic capacitors. lcm module
3 Detection of the variable capacitor
A gently rotating shaft, should feel very smooth and should not feel tight and sometimes loose even catching phenomenon. The axial load before and after, up, down, left, right, etc. pushed in all directions, the shaft should not be loose phenomenon. B rotating shaft with one hand, the other hand light touch the outer edge of the movable piece group should not feel any loosening. Contact between the shaft and the movable piece of poor variable capacitor, it can not continue to use. C place the multimeter R × 10k block, a hand two tables pen variable capacitors are connected to the movable piece and fixed terminals piece, the other hand to slowly rotating shaft few back and forth, multimeter pointer should In the infinity position does not move. In the rotating shaft in the process, if the pointer points to zero sometimes described movable piece and the short circuit between the stator; If you encounter a certain angle, meter reading is not infinite but a certain resistance, indicating that the variable capacitor Activity exists between the sheet and the stator leakage phenomenon.

Negative temperature coefficient thermistor detection oled module

1), measure the nominal resistance value Rt
NTC thermistor with a multimeter measuring methods and measuring the same way as ordinary fixed resistor that, according to the NTC thermistor nominal resistance choosing the right power block can be directly measured actual value of Rt. But NTC thermistors are temperature sensitive, so the test should note the following: ARt is the manufacturer at an ambient temperature of 25 ℃ measured, so measured with a multimeter Rt, we should at ambient temperature close to 25 ℃, carried out in order to ensure the credibility of the test. B measured power must not exceed the specified value, in order to avoid measurement errors caused by thermal effect of current. C Note correct operation. Test, do not hold hands thermistor body, in order to prevent an impact on the test body temperature.
(2), estimate the temperature coefficient αt 20x2 lcd
T1 first measured at room temperature resistance value Rt1, and then electric iron as a heat source, close to the thermistor Rt, the measured resistance value RT2, while the time measured with a thermometer thermistor RT average surface temperature t2 then calculated.
7 varistor testing. With a multimeter R × 1k block measuring varistor between two pins, the reverse insulation resistance, are infinite, otherwise, indicating leakage current. If the measured resistance is very small, indicating varistor is corrupt and can not be used. 40x2 lcd
8 photosensitive resistance testing. A piece of paper with a black translucent window will photoresistor cover, this time remained multimeter pointer does not move, the resistance approaches infinity. This value is the greater photoresistor better the performance. If this value is very small or close to zero, indicating that the photoresistor has burn damage, can not continue to be used. B will be a light at photoresistor light window, with the multimeter pointer should be more substantial swing, resistance was significantly reduced. This value is smaller the photoresistor better the performance. If this value is large or even infinite, indicate photoresistor open internal damage, can no longer continue to use. C will be aligned with the incident light transmitting window photoresistor lines, with black paper in the upper window shading photoresistor shaking so intermittent light, this time with the black paper multimeter pointer should be shaking and swinging around. If the meter pointer is not always in a position to stop shaking and swinging with the paper, indicating photoresistor photosensitive material has been damaged.

The detection resistor and experience oled module

1 fixed resistor is detected. A The two tables document (regardless of positive or negative) ends of each pin and the resistor connected to the actual measured resistance value. In order to improve the measurement accuracy, the measured resistance should be based on the size of the nominal value of the selected range. Since Ohm block scale nonlinear relationship, which in the middle of a more sophisticated indexing should therefore be possible to make the pointer indicates the value falls in the middle of the scale position, ie start of full scale of 20% to 80% within the arc to make measurement is more accurate. According to a different level of resistance error. Reading between the nominal resistance were allowed ± 5%, ± 10% or ± 20% of the errors. If it does not, beyond the range of error, then the value of the resistance value. B Note: The test, particularly in the measuring resistance over several kΩ resistor, the hands do not touch the Meter and the resistance of the conductive part; be detected down resistor solder from the circuit, at least to open a welding head, in order to avoid the circuit The other components of the test impacts, measurement error; color ring resistance is though to be able to determine the color ring logo, but is best when used with a multimeter to test the actual resistance. 8x2 lcd display
2 cement resistance testing. Detection of resistance of cement and testing methods and precautions ordinary fixed resistor identical.
3 fuse resistors detection. In the circuit, when the fuse resistors fuse open, you can make a judgment based on experience: If you find fuse resistors or charred black surface, it can be concluded that its overloaded exceed the rated current through it many times due; If the surface without any trace of the open, it indicates that the current flowing just equal to or slightly larger than its rated value of the fuse. For surface without any trace of bad judgment fuse resistors, can make use of a multimeter R × 1 block to measure, in order to ensure accurate measurement, should fuse resistors solder from the circuit under one end. If the measured resistance is infinite, then this fuse resistors lapsed open, if the measured resistance falls far short of the nominal value, indicating that the value of resistance change, it should no longer be used. Practice found in the maintenance, there are a few fuse resistors in the circuit is short-circuit breakdown phenomenon, testing should also be noted. 16x2 lcd display
4 potentiometer testing. Check the potentiometer, the first to turn the rotary handle, look rotary handle rotation is smooth, the switch is flexible, switch on, off "click" sound is crisp, and listen to a potentiometer resistor internal contacts and friction sound, if "rustling" sound, indicating poor quality.

Building digital video integrated environment oled module

Innovative applications for digital video, open platform undoubted effectiveness, which can be traced back to an open development platform have triggered the explosive growth of the PC market. TI's OMAP platform environment has improved the mobile phone application development to a new level, namely through integrated hardware and software so that software developers are still able to use existing systems and focus on exploring new markets and new sources of revenue, such as the development of text information transmission, as well as phone ringtone download other advanced applications. OMAP DaVinci technology also will be similar to the concept of an integrated environment into a wide range of digital video applications.
DaVinci technology provides an open development platform by developing integrated environment can support a variety of underlying operating system and the expansion of more applications. DaVinci software will initially support Linux, the future will continue to support other operating systems. Linux support includes peripheral drivers, real-time application management, application-level API, and production-ready code. And carefully optimized for video-based integrated DSP, special type of development tools, tuning drives, CODEC and the overall system-level application code combination enables developers to achieve a complete and complex digital video systems, can provide only a few function calls codec functions. 128x64 oled display
DaVinci software architecture covering the complete low-level OS drivers and even application API, so that developers do not put too much power to write and optimize the codec or DSP programming, digital video capabilities that can be achieved. The original Linux-based operating system API, allowing developers implement the codec does not touch the complex hardware and software details, which makes them having to modify the application code can achieve the multimedia codecs are interchangeable. When creating the application, developers can take advantage of standard OS development environment to write industry-recognized API, for storage, networking and video interface functions. And these jobs can be created in the same integrated development environment.
Developers can take advantage of the current Digital Video Evaluation Module (DVEVM) to build an integrated platform for the development of digital video, digital video system assessment and implementation. DVEVM contains MontaVista2.6.10 Linux Preview Kit and MontaVista GNU development tools, but also including NTSC / PAL camera, LCD screen, pre-wired video codec encoding and presentation, but also with the original video stream to create a new presentation. DVEVM can achieve video input / output connections, network interfaces, storage interfaces and standard daughter card connections, which enables developers to develop with DVEVM ideal application prototypes. Using DVEVM, developers can write applications for the ARM code directly suitable for production requirements, and can also be accessed through the DaVinci DSP core API has to start immediately DM6443 and DM6446 device application development work. 5.7 TFT display module
SOC-based digital video system inside is actually a highly integrated software, just one of the software are micro-code exists in the way. In the DaVinci software platform that can be broken down into multiple tasks CODEC, namely video (Video), images (Image), Voice (Speech), audio (Audio), collectively referred to as VISA. It also contains a multimedia framework components CODEC engine remote server. Which constitutes a signal processing layer (SPL) on the one hand through the VISA API interface with the application layer (APL) connection, on the other hand through the DSP / BIOS kernel and the underlying communication. APL contains differentiated customer value design software modules, and through the underlying kernel Linux API to communicate many peripheral interface driver.

Liquid crystal on silicon TFT Display Module design

LCoS (Liquid Crystal on Silicon) display design and application technology Category: HMI Published :2007 -08-29 Abstract: LCoS display structure and purpose, given LCoS display chip design methods and their practical design results. LCoS display is a reflective liquid crystal display, and its surrounding drivers and active pixel matrix using CMOS technology on silicon substrate, and a liquid crystal cell as the base wafer, which has a small size and high resolution for display properties. 5.7 TFT display module

1 LCoS display chip - a new class of SoC chip
LCD monitors mentioned, people will think of laptop LCD monitors, or large-screen plasma display. Exciting emerging fabricated on a silicon LCoS is an LCD display technology .
LCoS display is a new type of reflective displays, semiconductor VLSI technology and LCD technology unique combination of high-tech products, and its graphics chip diagonal size of 18mm. As LCoS using conventional CMOS technology can be mass-produced, and with the further development of semiconductor technology miniaturization while increasing resolution, LCoS display will have low power, miniature size, ultra-light weight and other characteristics, so in personal portable display applications aspect is very advantageous, in particular power consumption lower than Many active matrix liquid crystal display (AMLCD), and the production costs are expected cathode ray tube (CRT) to be compared.
Although typically only fingernail size LCoS display, the corresponding pixel also very small, as well as against direct eye to distinguish, but LCoS displays are equipped with a variety of the optical system for enlarging an image (Optical Engine): one is directly projected onto the retina to form an enlarged virtual image, thereby generating a virtual image of the individual flat display technology; other projection screen is to use a real image is formed larger, as shown in Figure 1. LCoS display technology has led to a new type of large-screen flat panel display was born. 16x4 lcd display
LCoS display technology as the core of the key components of the silicon backplane (LCoS display chip), is a multi-function, multi-structure system on chip (SoC), which integrates the entire display system around 18mm wafer. However, SoC chip design category the entire system must be holistic in various situations. Because of this well-designed, with a combination of display by the separation system compared to IC, SoC chip can be in the same class technology conditions to achieve higher performance system metrics. It can be expected, the system design and production of a new generation of chip mode LCD display, which will be very broad application prospects.

Wavelet image coding research hotspot issues oled module

In order to make the wavelet transform image coding method performance potential into full play, there are many problems to be solved, the current research work focuses on the effective organization of wavelet coefficients, the human visual characteristics of the application and select the best wavelet aspects. low temperature lcd

Effective organization  wavelet coefficients
For general images, the edges and contours are usually disordered, about their position often lack effective means of coding, it is difficult to find a better way to organize the coefficients. Therefore, the high frequency band coefficients of wavelet image effectively organize and coding wavelet image coding method is one of the keys. It is generally used to make zero-code continuous probability criterion to organize the biggest factor, the specific can be divided into two kinds: the high-frequency band in each individual according to the direction and the use of tissue factor relevant characteristics of each band using the structural organization of the quadtree coefficients.

Application of the human visual characteristics
In the image processing system, the visual redundancy status of the various forms of redundancy relative importance, so consider subjective characteristics of the human visual system is necessary. Image wavelet transform mechanism has some characteristics of the human eye perceive and process information is very consistent, but because people respect the limitations of the human visual characteristics, wavelet image compression is far from full use of the human visual characteristics, therefore, further research human visual system in the wavelet compression coding applications, deeper excavations image coding potential. 20x2 oled display

Best wavelet selection
Using wavelet image compression encoding, not all are suitable for wavelet decomposition of the image, the choice of different types of wavelet image compression effect is significant. Biorthogonal wavelet wavelet is better choice. But in image coding, wavelet image selection should also consider the characteristics and data boundary extension and other requirements, measurement criteria can only be the ultimate result of coding. Most occasions wavelet selection must be based on the specific application, based on experience to choose. How to choose the right according to the application wavelet which also look forward to further research.

Wavelet image coding research expansion Character LCD Modules

Because the wavelet transform multi-resolution characteristics, it has been successfully applied to image coding. However, the general wavelet image coding still has some shortcomings and limitations characteristics, so that people continue to study a new method of wavelet image coding. graphic lcd display module
① multi-wavelet transform multi-wavelet is a single wavelet promotion, ordinary single wavelet can not simultaneously have a symmetrical, orthogonal, limited support and other properties; while Multiwavelets relaxed restrictions on single wavelet function, you can also have these features, it Image compression will have broad application prospects.
② wavelet packet image coding for the signal wavelet packet analysis can provide a more detailed analysis method, it will be a multi-level division of the band, no breakdown of the multi-resolution analysis of high-frequency part of the further decomposition, and can be analyzed according to the signal characteristics, adaptive selection of respective frequency bands, the frequency spectrum of the signal to match, thereby increasing the time - frequency resolution.
③ second generation wavelet transform in 1994, proposed a Fourier transform does not depend on a new method to enhance the wavelet construction method, known as the second generation wavelet transform. Its characteristics are inherited first generation wavelet multi-resolution characteristics; does not depend Fourier transform; wavelet transform coefficients are integers; image restoration quality and transform boundary extension in what way has nothing to do. Because it can achieve image integer to integer transform, thus giving lossless image compression provides a theoretical basis. custom lcd module

Wavelet image coding method TFT Display Module

Embedded zerotree image coding (EZW) OLED Display Module
Shapiro 1992, proposed embedded EZW coding (EZW, i.e. embedded zerotree wavelet) method, which according to the same direction, different resolution subband similarity between images, the wavelet coefficients by the least (less than a certain threshold wavelet coefficients) organized as quadtree, and with fewer number of bits to represent it, thus greatly improving the image compression bit rate. EZW algorithm is a simple, but very effective image coding algorithm, which is to get the bits in the bit stream are sorted according to their importance. Using this algorithm, the coding can be at any point by the end of the code, thus allowing accurate to any target or target ratio distortion, but this time still produce exactly the same image. This algorithm does not require training feature is absolutely not required to pre-stored codebook point format, the image source does not require any prior knowledge. Therefore, some scholars believe, Shapior zero-tree wavelet image coding concept study of a milestone.
Hierarchical allocation of the sample tree image coding (SPIHT)
Allocated in a hierarchical tree sample image coding (SPIHT, ie set partitioning in hierarchical trees) is A.Said and WAPearlman proposed in 1996 an efficient compression algorithm, and its performance is better than EZW algorithm. EZW algorithm SPIHT algorithm is a further improvement, it is a tree node and all successor nodes are classified as the same collection, the collection is constantly segmentation process is divided into four sub-set of the set key, and then separately for each subset the importance of testing, in accordance with the minimum MSE ideological priority transmission coefficient magnitude larger.
Morphological representation of wavelet image coding data (MRWD)
1999 D.Servettto presents a morphological representation of wavelet image coding data (MRWD, ie morphological representation of wavelet data) method. And the EZW and SPIHT different, EZW and SPIHT is rule tree structure or a tree structure similar to a non-critical sub-band part and the formation MRWD significant portion of subband coding irregular beam. MRWD using mathematical morphology and statistical properties of wavelet coefficients (in the image sub-band wavelet coefficients at least two subsets have different statistical characteristics), directly in the subband significant coefficients generated irregularly shaped beam, so that the wavelet coefficient is divided into four collections, and then encode the collection beam. Low Temperature Display