LED TFT Display Module software environment

graphic lcd display module on the different properties of the display should be configured to meet the functional requirements of the display software, which has the following features:
a. comply with serialization and standardization requirements, can backward compatible;
b. using the detail specification of the operating system and language;
c. equipped with a sound self-test procedure and be equipped with various levels of diagnostic procedures;
d. PARTICULAR PURPOSE LED display with their corresponding special software.
Structure and appearance
Structure: COG LCD Display section are available in steel, aluminum, wood and other materials. Requirements rugged and beautiful.
Appearance: LED Display frame no scratches. Outdoor LED display pixel pipe installation should be the same, no loose and broken shell column.

Character LCD Modules performance characteristics

According to different types of LED display, OLED modules performance characteristics of the inspection, should meet the requirements of 5.5. Text, graphic LED display shows the test software used by visual inspection moved out of the way and show
Way. LED display on the computer video through visual, computer animation screenings compared with checks animated features, computer monitor with LED display and text display for the inspection function, with special test software
Check its grayscale function. LED display on the TV video in addition to the animation, text, grayscale function tests, should also check the TV with a video source and video functionality. A variety of lcd graphic display market, you should use the appropriate measuring
Test software to check its market display.

LCD panel segment oled module

A liquid crystal panel section of the module (lcm module): panel process can be divided into three stages, first semiconductor processes preceding (array), that is, the transistor is a thin film layer on the glass substrate made, compared with the middle of the liquid crystal filling assembly Process (cell), that is, the color filter layer of glass and glass film transistors, together, poured into a liquid crystal intermediate.
Again is the posterior segment, namely panel module, which is behind the cell plus backlit panels, iron with some IC components, a so-called panel module. Front and middle panels are highly automated process, the Taiwan authorities banned mainland investment projects. As for the rear section of the assembly, it is based on manpower to assemble.
Since LCM plant requires a lot of labor and labor, therefore located in the continent. lcd module is the Taiwan authorities to allow panel makers set up plants in mainland China only project.

Liquid crystal mixture preparation TFT Display Module

a. A liquid crystal composition and the requirements of a monomer preparation and composition of the mixed liquid crystal display device based solely determined by the requirements, generally speaking, TN device used for material requirements is relatively low, can be used, and for the preparation of such liquid crystalline monomer. Of course, a wide temperature range, low threshold voltage to increase a TN display materials, such as monomer. TFT Display Module
STN-LCD liquid crystal material properties required to be higher, usually a monomer selected of the following categories:
(A) phenyl cyclohexane type generally have lower viscosity of these compounds, such as molecular structure having three or more rings, the clearing point is high, increase in the modulation plays a clearing point temperature.
(B) biphenyl, pyrimidine and acetylenes because they have higher refractive index, can be prepared in a mixed system Δn desired value.
(C) contains a non-aromatic ring and a short-chain alkyl or alkoxy groups of liquid crystal compounds are typically large K33/K11 values.
(D) ethane compound has low viscosity class.
Most of the current super-twisted material selection phenyl cyclohexane classes and ethane-based liquid crystal as the main ingredient.
An active matrix display (AM-LCD) require higher liquid crystal material, in addition to low viscosity, but also requires a high resistivity, high charge retention and suitable dielectric anisotropy. Many of the current synthetic fluorinated liquid crystal material can basically meet its requirements.
b. In general mixing method, first select the appropriate low melting and nematic liquid crystal as a basic mixture ranges, some of which may be polar, non-polar other, which allows to change Δε; taking care to avoid generating near crystalline phase. These components should be selected by the requirement Δn control. If required low threshold, then the mixture should be added to the basic compound high Δε value. So, Δε / ε ⊥ adjustment ratio is even more difficult, but can also be added to change their materials. Then, often use additives to improve the definition highlights mixture clearing point. After several repeated so you can get the recipe mixture. Wherein each of the mixture components are to contribute to the final properties. Character LCD Display
Mixture formulation can also use the addition rule, based on the device performance and the relationship between material parameters, using a linear induction election to be determined by its optimization.
In the mixed crystal, due to the viscosity of the liquid crystal is relatively large (some are solid at room temperature), it must be heated to a crystal clear point, with mechanical stirring, magnetic stirring or ultrasonic methods such as mixed evenly. Stirring should be dust, moisture or dry protective atmosphere.

Onetouch touchscreen technology indicators TFT Display Module

Screen layout structure using sensors affixed to the glass panel on the front surface of the glass structure. Lcd display modules
Cable structure is usually drawn from the right cable.
The standard deviation of positioning accuracy of less than 2.03 mm, equivalent to the error is less than ± 1%.
Density 15-inch touch screen touch touch point density greater than 100,000 touch points / square cm.
Touch Activation Force Typically less than 85 grams.
Durability Durability refers to the surface durability of the glass, Mohs hardness rating of 7.
Life
No cover layer, coating, and moving parts, so there is no wear and tear. Use your fingers touch of class objects, at some point, even a touch more than 5 million times, the touch screen still work reliably. low temperature lcd

Touch screen embedded systems theory TFT Display Module

Touch screen attached to the surface of the display, with the display compatible use, if the touch point can measure the coordinate position on the screen, may be based on the corresponding coordinate points on the display or the display icons informed intention of touching. Touch screen can be divided into five categories according to their technical principles: vector pressure sensor, resistive, capacitive, infrared, surface acoustic wave, resistive touch screen which in embedded systems with more. Resistive touch screen is a four-layer composite film of a transparent screen, shown in Figure 2, the bottom is composed of glass or plexiglass grass, the top layer of the outer surface is so smooth and scratch-resistant hardened plastic layer, the middle two layers of conductive metal layer, respectively, at the grassroots level and the plastic layer on top of the inner surface of the conductive layer between two transparent isolation of many small points separate them. When a finger touches the screen, the two conductive layers in contact with the touch point. Character OLED Display
Touchscreen two metal conductive layers are two face touch screen, each end of each face is coated with a silver plastic, known as the face of a pair of electrodes, if a face is applied to the upper electrode voltage, in which the working surface will form a continuous parallel uniform voltage distribution. Shown in Figure 1, when the X-direction electrodes for applying a voltage determined, and the Y direction on the electrode when no voltage is applied, the voltage of the X parallel to the field, the voltage value at the contact in the Y + (or Y -) electrode reflected Y + by measuring the magnitude of the voltage electrode to ground contact will be aware of the X-coordinate value. Similarly, when a voltage is applied to the Y electrode, and the X electrode when no voltage by measuring the voltage of the electrode X +, Y coordinate of contact will be aware. Resistive touch screen with four lines and five line two. Four-wire touch screen X and Y face face increases in the two conductive layers, respectively, a total of four lead, are connected to a touch screen on the X electrode and the Y electrode pair. Five-wire touch screen face the X and Y are added to the face of the conductive coating on a glass substrate, but the work is still sharing the applied voltage, ie voltage field in both directions at the same time sharing the work face , the outer conductive layer is only used as a conductor and the voltage measuring electrodes. Therefore, the five-wire touch screen pinout need to 5. TFT Lcd Modules

Character LCD Modules packaging process description

1 chip test
Microscopy: the material surface for mechanical damage and pitting Ma Hang (lockhill)
Chip size and the size of the electrode meets the technical requirements
Electrode pattern is complete
(2) expansion of tablets
Since the LED chip dicing still tightly packed closely spaced (about 0.1mm), is not conducive to the process after the operation. We use a tablet machine to expand a membrane expansion chip bonding, the LED chip spacing stretched to about 0.6mm. You can also use manual expansion, but it is likely to cause problems of poor and waste chips fall.
3 Dispensing
The corresponding position in the LED bracket point silver plastic or rubber insulation. (For GaAs, SiC conductive substrate, a back electrode red, yellow, green chips, using silver paste for an insulating substrate of sapphire blue, green LED chips, using an insulating adhesive to fix the chip.)
Difficulty lies in the dispensing process control of the amount, in colloidal height, dispensing location are detailed process requirements.
Because silver plastic and rubber insulation in the storage and use are strict requirements, silver plastic wake materials, mixing, use of time is craft must pay attention to. 20x4 lcd display
4 AVAILABLE glue
And dispensing the contrary, prepare gum is prepared Melter first silver plastic coated electrode on the back of the LED, and then put back with a silver plastic of the LED in the LED mounting bracket. Prepare glue dispensing efficiency is much higher than, but not all products are prepared for dispensing process.
5 piece hand-thorn
After the expansion of the LED chip (prepared or not prepared adhesive glue) placed in the thorn piece desk fixture, LED fixture bracket on the bottom, under the microscope with a pin to an LED chip a stab to the appropriate position. Manual and automatic loading rack barbed piece compared to a benefit for ready replacement of different chips, chips for a variety of products that need to be installed.
6 automatic mounting bracket
Automatic loading rack is actually a combination of glue stick (dispensing) and mounting the chip two steps, the first point in the LED bracket silver plastic (plastic insulation), and then use a vacuum suction nozzle from the LED chip mobile location, and then placed in the corresponding bracket position.
Automatic loading rack in the process should be familiar with the main programming device operation, while dipping equipment and installation precision adjustment. The selection of the nozzle try to use bakelite nozzle, to prevent damage to the surface of the LED chip, especially blue, green chips must be bakelite. Because steel mouth will scratch the surface of the chip current spreading layer. lcd module
7 sintering
The purpose is to sinter the silver plastic curing, sintering temperature required to monitor and prevent adverse batch.
Silver plastic sintering temperature is controlled at 150 ℃, sintering time 2 hours. According to the actual situation can be adjusted to 170 ℃, 1 hr.
Plastic insulation generally 150 ℃, 1 hr.
Silver plastic sintering oven according to process requirements must be separated 2 hours (or 1 hour) open replace sintered products, intermediate can not be opened. Sintering oven must not be any other purpose, to prevent contamination.

A light guide plate manufacturing process TFT Display Module

In understanding the process should be preceded by understanding the parts and materials required for the light guide plate
1, the required materials and tools of the Ministry
a. Injection molding: Optical grade PMMA particles, ink
b. Crop: optical grade PMMA plates, inks

2, optical grade PMMA particles, flat: OLED Display Module
No matter what mode of production is produced out of the light guide its most important and original material optical grade PMMA (POLYMETHYL METHACRYLATE) (polymethyl methacrylate also known as acrylic or plexiglass, PMMA particles have their classification PMMA and PMMA plates extracted from petroleum monomer (MMA) and then the monomer (MMA) has been chemically processed to make optical grade PMMA particles (already available beginning with the injection molding), and then use optical grade PMMA particles casting method (Casting) or pressed out method (Injection) to produce optical grade PMMA plate, currently the industry recognized PMMA manufacturers are as follows: (Japan) Mitsubishi Rayon Mitsubishi Rayon, (Japan) Sumitomo Chemical Sumitomo, (Japan) Asahi Kasei Asahicasei, ( day) Kula Lei Kuraray, (Taiwan) Chi Mei Chemical, (Korea) World and Sehwa,
3, Ink: divided into two kinds of UV and IR
4, making way for the light guide plate cut three parts:
The first is the acrylic plate shape processing;
The second is a stencil production;
The third is printing, the process flow, respectively
a. acrylic cut the original plate contouring => Mirror planed> forming.
b. stencil production = Net Design> Film Output> stow net
c. printing = acrylic wash> Printing> Baking (IR) or ultraviolet light (UV)
5, injection molding light guide is divided into print and non-print type two, which is basically the same process as in the casting mold Printed in the injection will not cast on the network, so the only shot of the finished acrylic shape, and then after printing is completed until forming the light guide plate, rather than printing style is designed outlets cast in the mold, so that the outlets in the injection molding of the light guide plate simultaneously. graphic lcd 128x64

Character LCD Modules in SCM System

The LCD module uses a CCFL backlight, which is a cold cathode fluorescent lamp, high brightness, low power consumption, applicable to large-area displays the desired light, but requires the corresponding inverter. The system uses PYE-L10A inverter, which consists of the typical differential pair oscillation circuit, its output through a capacitor is divided into two, two lamps can be lit simultaneously. It is easy, +5 V input voltage, the output is AC 1300V (7mA) around the frequency 20 ~ 30kHz, with minimal conversion loss and a high output efficiency. Overall dimensions of 43 × 20 × 13.7mm. Usually installed in the MCU control panel, two AC output terminal is connected with the high-voltage leads and LCD. Because CCFL uses high voltage power supply, so when used with care to prevent damage due to high pressure shorting other devices. In addition, the use of lead should also note that the interface should not be too long, do not use cable as its output line. Character LCD Display

Generally, LCD liquid crystal display device is driven by a constant voltage to establish an electric field to achieve. Since the LCD typically requires a negative voltage drive power. Therefore, the drive circuit to generate a negative voltage converter chip. The DC-DC input voltage of 5V, the input current of 60mA, the board has the adjustment potentiometer, the output voltage can be negative -2 ~-22V is adjustable to suit the Graphic LCD Display

The working principle of the color filter TFT Display Module

TFT LCD panel has been able to produce color changes, mainly from color filters (Color Filter; CF); through the so-called liquid crystal panel driver IC voltage is changed, so that the liquid crystal molecules in a row standing or was reversed shape, forming the gate to select a backlight or light penetration, resulting in the screen, the picture presented at this time just black and white, in addition, the need through the red color filter (R), green (G), blue ( B) layer provides three color hue, form a color display. TFT LCD Misplays
Color filter manufacturing method comprising the dyeing method, a pigment dispersion method, a printing method, a plating method, an inkjet method, etc., in which the pigment dispersion due to the color characteristics, quality, and other aspects * are dominant, thus becoming the color filter rays of the mainstream production methods, the so-called pigment dispersion method color filter manufacturing engineering, including black matrix engineering, RGB works, finishing works, shipping works, first in black matrix project is the first in-alkali borosilicate glass substrate formed by sputtering on chromium / chromium low-reflection layer film, used as a substrate, this low-reflection layer film is called Metal Black, then, then Metal Black side of the positive type photoresist spin coating (Spin Coating), then through the black matrix mask pattern, exposure to UV irradiation and, after developing the photoresist, the Metal Black etched to form a black matrix (BM) pattern, the pattern on a black matrix is ​​formed, then goes RGB engineering, construction is the so-called RGB form the opening R, G, B three-color pattern works first of R colored with Spin coating color resist, a pattern mask by R, and irradiated with ultraviolet light exposure, and then using a base of the Department of the developer to remove the unexposed portion, forming a first color pattern of R, Zaishi above 200 degrees Celsius post-baking (Post Coating), the pattern having a resistance, and then patterned to form the same engineering R G, and B, repeat, the black matrix between the patterns are to be separated, this feature is to increase the display contrast, and to prevent noise light generation, followed in the latter works, is the formation of TFT Array opposite electrode substrate ITO transparent electrode layer, that is, color filters, and finally, shipping and packing engineering is the final inspection. color lcd display module
Color filter process technology critical to note that the RGB color between the segment deviation, segment deviation will affect the LCD performance segment deviation as large displays have faults produce, in addition, RGB works for the high temperature process, so the selection of raw materials shall be resistant to potency does not happen recession Furthermore BM mainly isolated RGB three colors, the key to improve the color contrast and BM generally require low reflection, reflection smaller the better color performance will be better.

Low TFT-Character LCD Modules technology introduction

Low-temperature polysilicon thin film transistors (polysilicon TFT) technology for high-definition LCD remains hopeful, but just want to process engineers have driven approach to improve the structure and the job today, South Korea, a company invented a technology that can speed up ratio ever brighter, higher-resolution monitor the launch. 256x64 oled

In the traditional design of active matrix LCD, the thin film transistor is made of amorphous silicon (a-Si) formed. Produced by the switching transistor is used as each pixel. These designs require personal computer can convert the signal into a suitable control of the display and pixel amplitudes of additional circuitry. Because conventional transistors can not be used to drive the pixel switches, IC manufacturers must be added to the customer's driver and scan functions screen. Amorphous silicon transistors also limits the size and functionality of the lighting per square inch can be the number of pixels. Result, today's PC using a-Si TFT LCD with every square inch from 60-90 pixels (PPi) range of pixel density. Although access to high resolution of about 200PPi a-Si TFT-LCD has few, if using an external driver IC, there will be constrained to limit the production of these displays commercial possibilities.
On the other hand, has been able to produce more than 200PPi resolution low-temperature polysilicon (LTPS) TFT-LCD to. For comparison purposes, consider the typical human eye is able to analyze the highest resolution about 350PPI. Better because the process can be eliminated and the display driver IC difference between the thousands of tape automated bonding, which can reduce the cost and improve the reliability of the display. SPI oled

Development of polarizing film for Character LCD Modules

(1) iodine based polarizing film
Composed of PVA and iodine polarizing long been on the market in the LCD occupies a large proportion. Materials and extension technology today under constant improvement and transmission polarization degree are very close to the theoretical value (100% degree of polarization; transmittance of 50%). COG LCD Module
(2) durability of the polarizing film of
Using dye formulations with a high temperature and humidity so polarizing film, light and other features, mostly used in cars, ships or aircraft used by the LCD. But polarization rate is less than iodine-based and expensive are its shortcomings. With today's development is the extension of the PVA alignment and development of a uniform absorption in the visible region of high partial optical properties of dye molecules, and its performance has partial rotation system with iodine polarizing rather, only the price is still higher than iodine-based polarizing film is high.
(3) an optical compensation film
With more and more technological advances in LCD products, so the coloring for polarizing film, perspective, light leakage so requires relatively increased, so need to do a variety of optical compensation film compensation. For example (STN-LCD) liquid crystal molecules twist due to more than 90 degrees resulting in the use of linearly polarized polarizing phenomenon will be colored, and its solution is coupled with a phase difference film. Coding System lcd module

Polarizing surface treatment TFT Display Module

Surface processing to increase the optical and mechanical properties of the polarizing film. In order to meet the current requirements of a variety of LCD, with complex function polarizing already on the market. SPI oled
1 anti-reflection (AR) treatment
When the light passes through the surface of a polarizing film, there will be about 5% of the reflection losses, because the loss of luminosity and the reflected light will cause the LCD to identify the degree of reduction. The method of improving the surface of the polarizing film is a metal film deposited on the use of light interference principle to reduce the reflection value of the reflection rate to 1% or less.
(2) anti-glare (AG) treatment
In order to avoid excessive concentration of the light is, the polarizing film processing into uneven surface, the light is uniformly dispersed, can achieve the effect of glare. AG has been processed, the surface up to 3H pencil hardness than scratch, another high fog applicable to large-size products (greater than 12.1 "), mainly due to strong backlight LCD's relationship with another LCD's resolution request for additional level as UXGA (1600 x 1200) AG requirements for more detailed treatment, currently polarizer manufacturers also started to notice this regard, I believe that there will be corresponding product for the most recent market assessment. 3.5 TFT display module

Cleanroom test TFT Display Module

Clean room and clean area test The primary purpose is to determine their operating performance. Existing "IEST RP-CC006.3: clean room test" provides a proven and is standardized testing procedures, it can determine the clean room and clean area performance. Test procedure is divided into two categories: initial testing and intermediate tests. Preliminary tests with cleanroom classification of airborne particulate cleanliness or closely related validation test contains the following sections: gas flow, speed and evenness testing; HEPA and ULPA filter installation and testing; calculated airborne particulate testing; interior plus pressure testing. Intermediate tests including cleanroom or clean zone for other characteristics, specified acceptance range consists of the following elements: visual flow characteristics test; illumination and illumination uniformity test; noise level test; temperature and humidity uniformity test; vibration testing. We may require one or more operating state, i.e. empty state, static or operating state for performance testing. In this literature does not make clear the test requirements of the order, however, in general, preferably in the order of preferred to perform certain tests. For example, for unidirectional cleanroom concerned, we recommend the following sequence: gas flow rate or flow rate test; visualize flow characteristics test; room pressurization test serial oled display
Recommended Practice (RP) is expected to help planners, designers, manufacturers and users, ready cleanroom testing detailed technical specifications to meet the requirements to ensure cleanroom operation. Under the agreement, the user will choose for their own cleanroom appropriate test and develop the necessary use of cleanroom acceptance range. Recommended Practices may also be used as a dedicated clean room writing internal test procedures.
Recommended practice is also recommended for a variety of test methods corresponding test equipment. If the clean room type (ie, one-way or one-way clean room clean room) affect the test method, then, then you can use alternative testing procedures. For some test procedures, it can have two or more of the test methods or test equipment, so that they can meet the concerns of the end-user requirements. In the use of alternative methods, the end user should be aware of the different ways the results may not be consistent.
In general, the recommended practice does not provide the range of acceptance, but only to determine the proper boundaries of the standard terminology. Moreover, recommended practice does not fully cover all be used to describe the operation of the clean room characteristics of the test parameters, for example, particle sedimentation rate, air molecules pollutants, microbes, electrostatic discharge (ESD), the recovery test and pollution leak test, and did not mention other and testing. 128x64 oled

And Character LCD Modules driver chip connection principle

ACF (anisotropic conductive film) is a thermosetting resin, are distributed inside a conductive ball, when the ball end of the gold electrodes and leads will be squeezed conductivity, COG type of module is to use this method connection, it has the advantage of the process time is very short. Graphic LCD Module
And compare another way, another technique is affixed help COF Au-Sn eutectic solder film covering the chip electrodes on the FPC by heating, and the bump electrode on the IC eutectic with gold, a metal, and between the chip and the tin film fill the gap of the filler in the future, this method has a fine pitch on a potential advantage, it is ACF mode can not be solved, but there is not realistic, in the production of a lot of disadvantages, for example, require a longer period of contact, temperature, and necessary fillers, etc., produced in the past used this technique when TAB.
All with gold electrodes of the LCD driver can use this technique to make COF.
COF connection
Since the contact surface can be plated COF, behind it and can be isolated PI, which can be made to any available COF FPC contact manner, for example, with enhanced pull-type socket with the FPC can be used, two contact surfaces can be soldered to the PCB fine, in addition there is a hollow electrode contact mode, use can also be soldered directly to the PCB, but this way the impact of raw materials, but also for domestic manufacturers generally not this.
As an integrated micro semiconductor material (Driver + character ROM + active devices) poured directly soldered on COF, which can withstand SMT reflow soldering process, so that some of the capacitors, resistors can be mounted on to the COF. COG LCD Display

Various liquid crystal molecular structure and the nature of the relationship TFT Display Module

Generally, the elongated rod-like or planar parallel to the beneficial molecules, and molecules of polarizable groups or polar group is related to the interaction between molecules, thereby affecting the phase transition temperature.
Center of the liquid crystal molecules of the liquid crystal properties of the bridge bond influence. The chemical stability of the liquid crystal, the first key depending on the nature of the center bridges, such as benzyl * (benzylidene) type liquid crystal to the center of the bridge bond is-CH == N-, it is susceptible to hydrolysis or oxidation, are extremely sensitive to water. In another example, the compound is easily oxidized even chlorine, especially in the light of the role. Others such as containing double bonds, triple bonds stilbene diphenyl acetylene, cinnamate and other derivatives are also easy to be oxidized and easy polymerization, the chemical stability is relatively poor, and under ultraviolet light may also be due to polymerization or cracking the loss characteristics of the liquid crystal.
Discard the first liquid crystal molecules in the center of the bridge bond, synthesis of biphenyl liquid crystal, liquid crystal stability than the other, indicating that the center bridges constituting the liquid crystal is not the only condition. Biphenyl liquid crystal is the most commonly used as a liquid crystal. Coding System lcd module
The spatial configuration of the liquid crystal molecules affect the thermal stability of liquid crystal, and other characteristics. Stilbene is planar conformation, azoxy molecular plane slightly twisted, distorted benzyl * LCD with large, clear them below stilbene. The clearing point of the oxidation azo rather peculiar, although it has a planar structure of the crystal, it is very likely when the liquid crystal phase, to a non-planar arrangement of molecules, molecular distortion, resulting in lower molecular rigidity, resulting in lower clearing point. Esters LCD weak conjugation it has the lowest clearing point. In addition, because of diphenyl acetylene-based liquid crystal molecular orbitals common yoke effect, so thermal stability than benzyl * class LCD.
In general, if the bridging connection is rigid, is conducive to the formation of a liquid crystal phase, branched chain end groups are generally more negative. Chain length of end groups to more subtle. If the rigid portion of the molecule lead to a strong interaction anisotropy, increase the bond length is not conducive to the stability of liquid crystal phase, if the rigid portion does not cause a strong steric hindrance, increasing chain length favorable interaction anisotropy.
Increased number of rings, which greatly increases the thermal stability of the liquid crystal, for example: low temperature lcd
When n = 1, the clearing point of 121 ℃; when n = 2, the clearing point of 297 ℃, a similar situation with multi-substituted benzene ring or a fused ring, also increased the stability of the liquid crystal.
Cis-trans structure on the thermal stability of the liquid crystal has a great influence. The trans-configuration of the rigid structure have a linear molecule, thus showing a liquid crystal phase, and a non-linear cis structure and a flexible molecular structure, and thus does not exhibit a liquid crystal phase , their molecular structure shown in Figure 18 . For example, many azo compounds, cinnamic acid esters, chlorinated diphenyl allyl, phenyl cyclohexane, hexane bicyclic compounds are trans LCD cis not.

COF design oled module

1, according to the actual chip data and modules required to draw schematics COF.
2, draw the outline drawing COF 5.7 TFT display module
According to the design requirements of the entire module to draw the outline drawing COF, and then draw an electrode contact portion with the LCD, under normal circumstances, the use of the number of driving COM + SEG number, plus one or both sides of the electrodes on the bit, that is the total number of electrodes N, if the electrode pitch is P, then the distance between the outermost two electrodes L1 = P1 × (N1-1). The width of the portion in contact with the LCD under normal circumstances is W1 ≥ L1 +2 mm, Figure 4 shows the COF module and the control interface of the CPU, the way the interface is used in the painting with reinforced pull type, if the number of electrodes is N2, pitch is P2, the outermost two electrodes from the L2 = P2 × (N2-1), the entire interface width W2 = P2 × (N2 +1) ± 0.1mm, if a double-contact type, the spacing of the electrode is relatively large, in general, not less than 0.6mm, 0.8mm is generally preferred spacing.
3, draw the chip pads figure, the chip pads map is very important, the general information in the chip are each pad to position the table, according to the pad position table, one by one, drawn, future chip bonding , the chip pad bumps to the graphics correspond to the FPC.
4, component placement, in accordance with the overall requirements of the module, the chip pads chart, other components pads placed to chart a reasonable figure, the process in place, we should follow the following principles: First, to guarantee off-line especially LCD driver IC and the upper part of the connection more; two components to be placed is reasonable, to avoid double-sided alignment.
5, take the line, this is a key part of the design, not only to the schematic line to go through, but also to ensure a good display effect, you need to go to a reasonable line, near-line can go a little thin, far away The line is to be a little rough, like driver SEG lines, usually in the middle of the relatively short walk away, you can fine point, while driving the COM line generally on both sides, we must appropriately thicker. In addition, the power supply and control lines go even a little rough, or even mention a band with two wire line. Here the COF inner lead and the external lead criteria: TFT LCD Display
6, the coating requirements
7, check the design, according to the customer's requirements and the methods used to check whether the design to achieve the customer's goals.

Built-screen design two major problems oled module

1. Display Mode
Display mode refers to the orientation of the substrate surface treatment, the LCD screen of the liquid crystal director within the arrangement of the different structural deformation occurs. TFT-LCD display modes using long twist angle of 90 degrees twisted arrangement (TN) mode. In recent years, with the progress of wide viewing angle, plane control (IPS) mode, a vertical alignment (VA) mode, optically compensated bend from (OCB) mode have been widely adopted. TN mode is characterized by high yield, mature technology and low cost. It can improve the viewing angle characteristics of phase difference plate, suitable for computer monitors. IPS mode, VA mode, COB mode are all wide viewing angle technology, response speed, aperture ratio, yield, cost its own characteristics. One of the IPS mode, the VA mode in particular, suitable for LCD TV, but the cost is higher. OLED modules
2. Key raw materials
Key alignment film material, a liquid crystal and a polarizing plate three. Alignment film material (PI) is currently entirely by the Japanese monopoly, there are major manufacturers such as Nissan Chemical and JSR 5. Nissan Chemical and JSR various display modes which are applicable to the alignment film material. Wherein the material used in the IPS mode Nissan Chemical based, VA mode, the materials used in the JSR-based. Liquid crystal material is now largely from Japan and Germany meruku chi-so production and supply market. In addition to Sharp LCD TV development of the latest LCD ASV. The liquid crystal material has two main selection criteria. A low-voltage drive, requiring a range of 3 to 5 volts, and preferably driven by the same voltage and chip. Another is to reduce viscosity and improve the response speed to fit the needs of the LCD TV. In addition, the current fifth-generation LCD production line using pre-drops (ODF) technology also requires the viscosity of the liquid crystal can be relatively low. Graphic LCD Module
Polarizer of the major manufacturers a total of six. Japan 4 Korea Taiwan each one. Nitto Denko which in large size (desktop monitors and LCD TVs) in relatively strong, Sumitomo Chemical in small and medium size (car, mobile phone) has an advantage. Mainly through the polarizer and reflective / semi-transmissive type two kinds. Usually after anti-glare surface (AG) or anti-reflection (AR) process.

TFT Display Module design elements

TFT is the production of large-area deposition technique (sputtering, CVD) and the product of the combination lithography. Currently, the fifth generation production line is generally only four sub-lithographic TFT is formed that can require the insulating film, a semiconductor film, a pixel electrode (ITO) and so on. Primarily on the design of the Coding System lcd module product specifications indicators, one of screen size, number of pixels, drive mode, the opening ratio is particularly important for the design of the TFT. To consider the basic structure of the TFT, the film material, pitch / width, arrangement of electrodes and other basic elements lithography registration. In order to improve the response speed and reduce the wiring resistance, at present, when the scanning line driving from one side of 15-inch XGA basic use of molybdenum and tungsten alloy 20-inch SXGA aluminum, larger than 20 inches higher resolution when using copper material. However, if the drive is designed to scan both sides of the line, you can relax on the wiring resistance requirements.

Built-screen first need the CF and TFT glass substrate coated on a glass substrate were oriented film after curing with a rubbing cloth directional processing, and then on the CF substrate crossed with dispensing closure box and pre-produced liquid crystal droplets, and then Graphic lcd modules substrate superposed on the bit nip formed on the CF substrate gap thickness of 5 microns of the liquid crystal cell. Finally, the UV-curing glue sealed box, cut / paste side lobes and two polarizers.

TFT-Character LCD Modules technology design ideas

Is the current TFT-LCD flat panel display (FPD) of the mainstream. This paper describes the design ideas TFT-LCD technology and material selection, and in the last part of the list of foreign countries in the TFT-LCD existing computer-aided design software for everyone preliminary understanding of TFT-LCD design provides technical reference. Lcd display modules
A. First set of indicators of performance parameters
Design can be based on market needs and user requirements, taking into account the capacity of the production line equipment, the planning of new products TFT-LCD screen size, brightness, contrast, resolution, the opening ratio, response time, scanning frequency, the drive mode, the pixel pitch, sub-pixel arrangement, backlight type, environmental conditions, anti-glare anti-reflection treatment specifications indicators.
Two. Select for TFT-LCD glass
TFT-LCD flat glass for the boron-alkali aluminosilicate glass. Requires precise size, surface roughness, softening point above 650 degrees, no scratches and bubbles, good chemical stability, low thermal expansion coefficient. Phone with a glass thickness of 0.4mm, PC and LCD TVs generally use 0.6 or 0.7mm glass. Now the market supply of TFT-LCD flat glass altogether 4. Corning 1737 respectively, and EAGLE2000 type, Nippon Electric Glass of OA10 and OA21 type Asahi AN100 type, NH The NA35 type. Fifth-generation glass substrate size 1100X1300mm, mainly produced by melt stretching Corning glass or float glass production of Asahi Glass.
III. Selected according to the purpose color filter (CF)

The color filter is to achieve the TFT-LCD color display key component. In the TFT-LCD, the color filter for the front glass substrate. Its manufacturing process is to set the black matrix (BM), and respectively to make red (R), green (G), blue (B) three-color dot, the next in the R, G, B coated with a protective film, and the production driving the liquid crystal with a transparent conductive film (ITO). The pigment printing process based.
CF is about nine manufacturers, including convex plate printing and Dai Nippon Printing, etc. In the fifth alternative color filter manufacturing technology development to invest more. The main consideration when designing the selected CF whether attached column CF and color (RGB) are arranged. Column with the color filter CF is a black matrix (BM), through the photolithography process has a cylindrical preform liner material, will be omitted in the manufacturing process, distribution screen spacer of the processes. Color (RGB) with the arrangement of RGB stripe arrangement, RGB and RGB delta arrangement arranged in a matrix. Stripe arrangement is characterized by a small pixel pitch, suitable for computer monitors use. Matrix arrangement can be relatively easily obtained color natural images. Triangular arrangement of the larger aperture ratio, commonly used in small and medium sized LCD TV. COG LCD Module

Character LCD Modules device structure outlined

The basic structure of the OLED display device structure can be divided into single, double device structure, the device structure and multi-layer structures, and other devices. lcm module
Single layer structure between the positive and negative poles of the device contains only one organic light emitting layer, such a structure used in the doped type OLED. The poor performance of the device structure, Since both carriers into imbalance, so the composite probability is small, the light emitting efficiency is low; the thickness of the organic film device, the driving voltage is high.
In the two-layer structure device, since most of the organic material is not very nature, a hole with transmission with transmission electronic in nature, but also has equal hole and electron transport properties of the organic material is minimal. In order to effectively solve the electron and hole recombination zone away from the electrodes and the equilibrium carrier injection efficiency problems and improve the luminous efficiency of the OLED using the double-layer structure. The device layer structure effectively balanced injection of holes and electrons, improving the injection rate of carriers and light emission efficiency and quantum efficiency of the device.
The device layer structure consisting of a hole transport layer (HTL), an electron transport layer (ETL) and a light emitting layer (EML) components. In this structure, the three functional layers of his functions, allowing the device to optimize the performance, which is a standard device structure.
To reduce the drive voltage, increase the contrast, increases the quantum efficiency and the use of a multilayer structure emission luminance. OLED multilayer structure not only ensures the functional layer with good adhesion between the glass, but also from the anode and cathode such that the carriers more easily injected into the organic functional film. However, the multilayer structure to improve device performance, it would also bring to the complex interface between the layers effect. lcd module

Character LCD Modules performance of the main parameters of evaluation

Typically, OLED light-emitting materials and device performance from the luminescent properties and electrical properties of two aspects to evaluate. Luminescent properties include the emission spectra, emission luminance, luminous efficiency, light color, and life; the electrical properties include the relationship between current and voltage, the relationship between luminance and voltage, these are the OLED materials and devices to measure performance of the main parameters .
1, the emission spectrum

Refers to the emission spectrum of the fluorescence emitted by the various wavelength components of the relative intensity, also called the relative fluorescence intensity versus wavelength distribution. Emission spectra of various types generally used to measure the fluorescence measuring instrument, the measurement method is: fluorescence irradiated by monochromatic emitter detector, scanning monochromator emitter and detection of various wavelengths corresponding to the fluorescence intensity, and then recorder records the emission wavelength of the fluorescence intensity of the curve, the emission spectrum is obtained.

There are two types of OLED emission spectrum, i.e. the photoluminescence (PL) spectra and electroluminescent (EL) spectra. PL spectrum of the excitation light required, and to the wavelength and intensity of excitation light remains unchanged; EL spectrum of the excitation energy is needed, can be measured at different voltage or current density the EL spectra. The EL spectrum of the device by comparing with a different carrier transport material and a luminescent material PL spectra The location of the composite can be drawn and the actual light-emitting substance useful information.
2 and luminance

Brightness is measured in cd / m, which means that the luminous intensity per square meter, brightness is generally used to measure the luminance meter. The first production of the brightness of the OLED device has exceeded the 1000cd / ㎡, and now the brightest OLED brightness can exceed 140000cd / m. Serial Lcd Display Module

3, the luminous efficiency

OLED luminous efficiency can be used quantum efficiency, power efficiency and luminous efficiency to represent.
Ηq quantum efficiency means the output photon number Nf and the injected electron-hole pairs in the ratio of the number Nx. Quantum efficiency is further divided into internal quantum efficiency ηqi and external quantum efficiency ηqe. Ηqi internal quantum efficiency of the device is generated internally by the complex number of photons of radiation into electron-hole pairs and the ratio of the number; fact, the luminous efficiency of the device by the external quantum efficiency ηqe to reflect, expressed by the following formula.

External quantum efficiency can be measured using an integrating sphere photometer unit time total flux emitting device, obtained by calculation of the external quantum efficiency of the device.

Excitation photon energy is always greater than the energy of the photons emitted light when the excitation wavelength than the length of a lot of light emission, this energy loss is very big, and the quantum efficiency does not reflect this energy loss, power efficiency needed to reflect . Power efficiency ηp, also known as energy efficiency means the output optical power Pf and electric power input ratio Px. Measure of a light emitting device function, multi-lumen efficiency of this parameter. Luminous efficiency ηl, also called photometric efficiency, luminous flux emitted L (in lumens) and the input of the ratio of the electric power Px. OLEDs

Where, S is emitting area (square meters), B for the luminance (cd / ㎡), I and V were applied when measuring the brightness of the bias current and voltage, J is the corresponding current density (A / m), Lumen efficiency of the unit is lm / W.

International cleanroom standards oled module

In 1990, in response to the development level of worldwide recognition of the clean room, the construction and operation of the program requirements, through established within the European Committee for Standardization CEN/TC243 One occasion doped nibbling Huang Li (CEN: ComiteEuropeendeNormalisation; TC: Technical Committee) and created a a requirement to develop procedures and international institutions. CEN/TC243 Technical Committee by the British Standards Institution (BSI) initiative established, which consists of four working groups:
- The first working group airborne pollution
- Working Group II microbiological contamination
- Design and Operation of Working Group III
- Terminology Working Group IV
As CEN/TC243 establishment and Environmental Science and Technology Association (IEST) and other initiatives to clean Engineering Society, the International Organization for Standardization (ISO) in 1992 and the establishment of a technical committee, which ISO/TC209 "clean rooms and associated controlled Environment "technical committee. The purpose of its creation time is within the field of clean room engineering standardization of global recognition can never exclude the United States and Japan. May 1993, the Technical Committee was formally established. Thus, CEN/TC243 four working groups have been promulgated and published seven draft standard. ISO/TC209 The first meeting was held in November 1993. Before the end of 1999, the Commission on the development of global standards agreement. At this meeting, the first batch of 11 full members (P members) confirmed their membership. Since then, P the number of members increased to 19, the current members to attend (O members) has 17. ISO/TC209 official mission is "the spirit of the equipment, facilities and operational approaches standardization purposes, the development of clean rooms and associated controlled environments international standards to determine the procedural limits and test procedures in order to reduce pollution."
Given the impact of standardization work in the world, ISO/TC209 and CEN/TC243 work places so-called "Vienna Agreement" as the basis, which is the International Organization for Standardization (ISO) and the European Committee for Standardization CEN technical cooperation between a agreement. The purpose of this program is to ensure that the International Organization for Standardization and the European Committee for Standardization in working with a theme will be available when needed fed back, and to ensure that the development of these standards can be implemented Man Yun Hi Po táng  resistant plating Directed North acupuncture filthy boas  . Can play an effective role as a decision, "Vienna Agreement" in this case the aim is, ISO/TC209 draft European standards in order to develop international standards based on the work to continue to play a leading role, and plays an auxiliary CEN/TC243 and comment on the role. Then set up seven working groups, in CEN/TC243 working group based on the completion of its stated goals, the eighth Working Group was established in 1998:
- The first working group aerosols cleanliness, group
- Working Group II biological contamination
- Working Group III Metrology and Test Methods
- Design and Construction of Working Group IV
- Report of Working Group cleanroom operation
- Working Group VI of terms, definitions and units
- Working Group VII Enhanced cleaning device
- Working Group VIII molecular contamination
Development of an international standard to be followed by a strict set of arrangements. Provisions in accordance with ISO and CEN standardization process, its advantages:
- All industry-leading active and serious geographic participation largely expected to be beneficial to the formation of professional technical and global links.
- Fixed strict formal procedural arrangements ensuring transparency and recognition.
- Right now considering rules and regulations to promote the development of guidelines in terms of coordination. 16x1 lcd display
Standardization principles explained as follows:
- For the clean room engineering standards developed, should be dedicated to this field has an overall impact on the subject, regardless of their relevance to, shall apply
All the clean room engineering and associated application area.
- Specific applications, such as: specific technical department of the air cleanliness requirements, should not be used ISO/TC209 for processing.
- These standards should be targeted: the requirements to be achieved must be clearly defined, but the completion of objectives, namely technical measures taken,
- Should ensure a maximum degree of freedom.
Should be encouraged and facilitated, and must not impede progress.
- These standards should help to reduce trade restrictions and promoting technological understanding among nations, we can not for some countries to implement privilege, nor
Can take their discriminatory attitudes.
In these standardized project work meeting, repeatedly declared to follow the principle of consensus led to the importance of technical standardization. This principle requires, is not used to make decisions within the working group the way most people vote, all technical issues must be on the basis of unanimity resolved. In practice, this means that, for there are different views on the issue, either through discussion and eventual agreement solution, or not included in the scope of standardization work. custom lcd display
Again, whenever the exaggerated, inappropriate, or in their own interests the provisions set forth in the exclusion from the standardization work out, have confirmed the principle that effective screening measures. When certain countries or with the authority of the rules and regulations affecting performance to impede, not advance when, ISO/TC209 to actively make necessary unconventional move. One example is the clean room airflow requirements and isolate problems.
Instead, consensus is not based on principles set out guidelines and to reflect the individual experience or individual professionals review the terms of the content, are not included in the regulations.

Character LCD Modules modular design of the new concept

Light-emitting diodes (Light Emitting Diode; LED) is a tiny solid (Solid-State) light source, whose main base properties and attributes are already well known, including both small size, low power consumption, long life, without glass, mercury or other toxic gases solid-state lighting technology, with a variety of emerging applications, is already ubiquitous in daily life source.
For example: the road semaphore signals, the traditional incandescent bulbs with 150-watt power consumption is only 12 watts was LED lights are replaced, which not only reduces maintenance and maintenance costs, but also significantly reduce their electricity consumption, which on the whole energy market has a very clear vote. TFT LCD Misplays
On the other hand, with the advent of white LED luminous efficiency increased year by year, color rendering and color temperature getting good performance and lower prices, so that LED lighting applications become more broad, such as energy saving and environmental issues in the next, LED industry for LED each light-emitting properties, continue to invest energy research and development, and vigorously promote the application level and the breakthrough stage lighting traditional lighting habits.
However, due to LED is a low-voltage, low-current drive components, the primary problems faced is how to provide efficient voltage conversion. Whether handheld devices, automotive, lighting, display and other applications require a high-efficiency buck or boost regulator; addition, it must be the heat generated by the LED to a minimum. lcd module
Currently around the world there have been many IC manufacturers began to provide the industry with a variety of optional LED drivers to meet the requirements of the operating voltage, and thus accelerate the popularization of LED applications footsteps.
LED to become the next generation as an alternative to fluorescent lighting opportunity is getting strong, setting aside the above factors, the price of LED and LED attenuation problems, existing technology architecture or around the expensive, life is not long, hard-High Power dissipation LED and other applications.

Character LCD Modules TVs use systems integration reduces design complexity

With conventional CRT TV circuit design is different, because LCD TV requires multiple devices for voice, text, and image processing and system control, the circuit design is too complex. custom lcd
First, LCD TV video content is scaled to fit the formation of the active matrix display rows and columns of the fixed grid, such a high scaling engine by the horizontal and vertical scaling filter.
Secondly, LCD TV requires other adjustments to the signal is displayed on the flat panel display. CRT TV medium and low field frequency of 50Hz and an alternate use of the way to display the video frame, and full use of the LCD TV if the refresh rate of 50 Hz can not do this, it is because the LCD flat panel display to the retention of the entire frame period pixel information until new information is written. For moving images, which implies the need to write the progressive scan full frame information at different times in order to prevent the information recorded on the overlap of the two interlaced frames, the need for signal "de-interlacing." This means that for odd frames, respectively, in the calculation of the information in the odd field, the need to maintain a neat without jagged edges adverse effects, which requires the use of advanced video algorithms.
In addition, the peak white level limit, OLED Display color saturation, contrast, noise reduction algorithms, and also need to be optimized for the LCD. Finally, LCD TV using low-voltage differential signaling (LVDS) or TTL level interface to the video data to the LCD panel.

Analysis of the Character LCD Modules screen technology

LCD (Liquid Crystal) screen technology has experienced a very long process, from the most primitive to the black and white screen is now being popular color, every technological innovation, all startled a wild waves. Often chatted about the screen, there are always inseparable TFT, STN, OLED, TFT, false color, etc. The term is not often feel confused? Do not worry, in fact, not difficult to understand that knowledge. 20x2 oled
First talk about the principle of the LCD (although boring, but only the first understanding its structure and principle, to understand its technical and technological characteristics targeted in the purchase order, the application and maintenance to be more scientific and reasonable, patience and see) , 1888, Australian botanist Reinitzer (Reinitzer) of cholesterol's role in plants, the use of cholesteric benzene test, inadvertently discovered the LCD, which is an almost completely transparent material presented simultaneously Some characteristics of solids and liquids. Appears from the shape and appearance of the liquid crystal is a liquid crystal type but its molecular structure and exhibit a solid form. The same as the metal in a magnetic field, when subjected to the external electric field, it will produce an accurate molecular ordered; such as alignment of the molecules to be properly controlled, the liquid crystal molecules will allow light to penetrate; light path through the liquid crystal can be constituted to determine its molecular arrangement, which is a feature of the solid. LCD is an organic compound, by a long rod-like molecules. In the natural state, the long axis substantially parallel to the rod-like molecules.
LCD (Liquid Crystal Display, hereinafter referred to as LCD) first feature is the LCD must be poured into two columns with fine grooves between the plane to work properly. These two planes perpendicular to the groove (90 ° intersection), that is, if the molecule on a plane arranged in the north-south, the other thing to the molecular plane of arrangement, which is located between two planar molecules are Forced go into a 90-degree twist state. Since molecules are arranged along the direction of light propagation, so when the light through the liquid crystal is twisted 90 degrees. But when the LCD plus a voltage, the molecules will be re-arranged vertically, so that the light can be directed to go out without any reverse. The second characteristic of LCD is that it relies polarization filters and light itself, natural light in all directions is random divergence, polarization filter is actually a series of increasingly fine parallel lines. These lines form a network, blocking these lines are not parallel with all light polarization filters coincided with the first vertical line, they are able to completely block those already polarized light. Only two filters completely parallel lines, or light itself has been reversed with the second polarization filter to match the light was able to penetrate. LCD precisely by such two mutually perpendicular polarization filter constituted so in normal circumstances should block all attempts to penetrate the light. However, since the two twisted liquid crystal filled between filters, so the light piercing the first filter, the liquid crystal molecules are twisted by 90 degrees, and finally from the second filter in the shell. On the other hand, if it is to add a voltage of the liquid crystal molecules will rearrange and completely parallel, so that the light is no longer turn, so just by the second filter block. In short, the light blocking power, no power will make the light emitted. Of course, you can change the arrangement of the liquid crystal LCD, so that the light emitted at power, when power is not blocked. However, due to the LCD screen is almost always on, so only the "power to the light blocking" of the program in order to achieve the most energy purposes. QVGA lcd
LCD screen can be divided into black and white LCD screen and the LCD color screen, LCD monochrome screen called TN (Twisted Nematic) screen, mainly used in digital watches, calculators, handheld game consoles and other devices, in addition to the power LCD monochrome screen and manufacturing costs lower than LCD color screen, the other not, and color. And with color screen technology matures, black and white LCD screen will eventually quit the stage of history.

FFU intelligent control system oled module

At present, the application areas of FFU, the control system application rate is still relatively low, but also in the international market popular FFU intelligent control system, generally only equipped with brushless DC motor for FFU. Especially in today's global energy more tense, the energy efficiency of the control system is increasingly being valued by people. Each clean room according to the production process, determine the appropriate speed, but they have to consider energy issues. The general control system can adjust the limited range of wind speeds, depending on the requirements can not provide accurate speed, especially outside of 8 hours of rest, still maintain a high speed, which  lcm module  undoubtedly brings a huge energy waste. For this situation, recently introduced the ability to adjust their speed digitization HH-F series FFU intelligent control system. The system is simple, user-friendly, especially according to the specific wind cleanroom requirements (eg 0.37m / s, 0.28m / s), digital set.
Can be flexibly controlled clean room each fan starts and stops and speed, the control system using the repeater technology to solve the problem of limited capacity 485 drive can be controlled infinitely turbines. The control system consists of the following four parts: Lcd display module
◆ Field intelligent controller
◆ wired centralized control
◆ Remote Control
◆ System integrated functions

FFU field intelligent control oled module

Field intelligent control module to microcontroller core processors to achieve control. An intelligent module controls one FFU. Field intelligent control module is divided into voltage regulator module and inverter module, two kinds of intelligent control module enables the following control functions:
1) intelligent module has a strong opening, with optional HART (pluggable) site control can be achieved: by reserving the RS485 interface enables remote centralized control and fault diagnosis and setting: With the optional The remote control module (pluggable) can achieve remote control. 20x2 lcd display
2) through removable handheld enables start and stop FFU and accurate variable speed FFU outlet velocity values ​​can be displayed.
3) The intelligent module enables FFU with energy-saving features.
4) with overload and short-circuit protection functions: overload, prompting alarm unit alarm; short, prompting alarm unit FFU alarm and automatically cut off the power.
Wired control

Wired control mode control mode is optional, it is set aside by field intelligence module RS485 interfaces. In order to meet the needs of different users, we use the control panel and touch screen control modes, the control panel is simple, but the display is not intuitive, and achieve limited functionality; touch screen cost, easy operation, display a rich and powerful.
Touch screen control method consists of the following three components: 1) the central control unit; 2) human-machine interface unit; 3) alarm control unit. graphic lcd 128x64

FFU touch screen control oled module

1) the central control unit, PLC controller. To achieve the following control functions:
◆ intelligent control module with field bus system using RS485 connection method, the collected field data analysis, processing; achieve on-site equipment control functions. In order to achieve all of the on-site centralized monitoring and control of FFU. 16x2 oled display
◆ communicate with the alarm control unit.
◆ with the man-machine interface unit to communicate.
2) human-machine interface unit, using the touch screen to achieve remote monitoring and adjustment for FFU. To achieve the following control functions:
◆ be able to facilitate the realization of FFU single, multiple, and zone control. That is, an arbitrary number of units can simultaneously control the FFU.
◆ FFU can achieve any number of units start and stop and speed control function, speed control function enables digital, that is, directly enter the desired velocity value (example: 0.25,0.31, etc.) in order to achieve the purpose of speed.
◆ Renyiyitai FFU capable of monitoring wind speed values.
◆ When a fault alarm FFU, can display real-time fault FFU.
3) alarm control unit, using sound and light alarm devices, through communication with the central processing unit, when any one or more FFU fails, the control unit real audible alarm, and with the man-machine interface unit with quickly determine the fault FFU, monitoring personnel to ensure timely processing failure. 5.7 TFT display module

Electrostatic occurred in these places oled module

(A), paper electrostatic hazards occur in the wheel when rewinding and product packing, result in electric shock, product defects and so on.
(Two), electrostatic hazards in finished textiles speed transmission accumulate static result in electric shock, product defect for many, also a result of fire explosion. color lcd display module
(Three), printing, plastics, and rubber industry and other similar types of electrostatic hazards, occurs in the finished roll delivery caused by high static operations, result in electric shock and bad products, electrostatic ink or solvent will result in ignition fire and explosion.
(Four), the petrochemical industry electrostatic hazards occur in fluid transfer, mixing, powder grinding, feeding, screening and other operations, although the frequency of occurrence of hazardous events is low, but if it is an accident hazard disaster occurred mostly very serious consequences.
(Five), power electronics industry electrostatic electrostatic hazards and damage caused by defective products mainly electrostatic hazards in the food industry jobs powder storage tank with alcohol-based jobs. For the process of electrostatic hazards incident to adopt preventive measures, you should first understand the electrostatic hazards occur principle, familiar with the hazards development process electrostatic generation and dissipation factor, and electrostatic discharge types and hazards, be able to identify electrostatic hazards formed at each stage, and then reasons for the use of static electricity can harm measuring instruments for the process of material and environmental measurement, control system Cheng Zhongjing electrical quantities, assess a potential electrostatic hazards, develop and adopt appropriate follow-up of static electricity hazard control methods, while continuing capacity measurement and comparison purposes the effects of electrostatic hazards protective measures can effectively reduce the electrostatic potential hazards, improve the operational safety of the production process and personnel safety. low temperature lcd display

Knowledge about static electricity oled module

I. Introduction Although the earliest electrical electrostatic effect is experimentally proved out, but in the modern industrial system Cheng Zhongjing electricity still be regarded as "undetermined." General industry on the electrostatic hazards prevention techniques can be quite strange, and often takes quite a lot of misunderstanding or misuse prevention methods without realizing that failed to prevent electrostatic damage accident. In most industrial processes in the accumulation of electrostatic charge is generated, ranging from people feel uncomfortable, heavy cause harm to humans, even in the flammable gas, liquid and dust handling and transportation process, resulting in fire and explosion . In particular, with electrostatic potential hazards in certain industries such as: chemical, oil, paint, plastics, pharmaceutical, food, printing and electronics industries, prone to electrostatic hazards arise.
Second, the generation of electrostatic hazards. In the working environment, all fire and explosion due to static electricity incidents have followed the same procedure, as follows: First, charge separation occurs, then the charge accumulation, if the charge can not be dissipated, electrostatic discharge will occur, but may ignite surrounding Yi flammable substances, fire and explosion hazard events occur. Many industrial processes often use very poor conductivity of the material, and often surface contact, separation and movement of the operation, resulting in the phenomenon of charge separation. For example: high resistance value of liquid flow or filtration, powder grinding, mixing or screening process, powder pneumatic transport, personnel or vehicles moving on the floor insulation, conveyor belts or flaky material on the rollers of movement, etc. . In the above or similar process occurs in both static problems. When the charge accumulated on the object to the electric field of the dielectric strength of air 3MV / m when the discharge phenomenon is generated, the whole or part of its stored energy is released to form a discharge path for light and heat, and may ignite explosive substances. According to the minimum ignition of flammable substances energy data can be extrapolated electrostatic discharge energy is sufficient to ignite the flammable substances. OLED Display
Recently, because the parts are many devices using a non-conductive plastic, so that a portion of the device of metal components, components, piping, vessels or structures form an electrical insulator, resulting in the gradual accumulation of charge to a dangerous level. Typical examples include: the plastic piping installation metal funnel, a metal pipe on the road due to certain non-conductive gasket leaving metallic pipe insulation, insulation for wearing shoes or person standing on the floor leaving the body is insulated insulation. Accumulated on the insulated conductor a charge generation discharge, all of the energy will be released in a discharge, such spark discharge is called electrostatic discharge. In general, the spark discharge can ignite flammable gases, vapors and dust clouds. The surface of the insulating charge rate of movement is very slow, however, the duration of ESD extremely short, so the electric charge accumulated in the insulating body, not in one-time release all electrostatic discharge, which may be in the neighborhood of the insulating surface area of ​​occurrence multiple electrostatic discharge. Because the geometry of the charge and the surrounding environment of the different firing patterns can be divided into: corona discharge, brush discharge, as well as radially discharging three. In general, the energy is greater than the brush corona discharge. Brush-like discharge energy sufficient to ignite flammable gases many, solvent vapor and mixtures thereof. As a non-conductive film on both sides full positive and negative electric charges in the accumulation significant amount of charge, if the discharge occurs radially most of its energy is sufficient to ignite the combustible gas and combustible dust. In a large silo or container full of highly charged particles occurs at the surface of the product discharge radial manner, known as bulk powder piled electricity. If flammable gases or has a low minimum ignition energy of dust clouds exist, then there is even a big potential hazards, it is necessary to try to exclude a large powder piled electricity generation. graphic lcd modules

Electrostatic Hazard Control Methods oled module

Electrostatic hazard control methods can be divided into the ground, increase the humidity, the speed limit, antistatic materials, static eliminator with other five. Industrial manufacturing process, due to the operating environment, procedures and different materials, electrostatic hazards implemented control methods will be different. Site selection process must consider the environment, conditions and limitations, and even funding, management systems and quality of human resources and other factors. Without an electrostatic hazard control methods can be applied to all industrial processes or situations, sometimes while using two or more kinds of electrostatic hazard control methods.
(A), grounding electrostatic hazards control methods, the ground is the most effective and economical method. The manufacturing process due to friction, such as induction or conduction means static, if the OLED Display Module charge accumulation in the insulation of metal equipment, products or persons conductive body, the charges accumulated in a discharge energy will be released. Such electrostatic discharge to occur mainly due to electrostatic hazards incident. The control method is to all electrically conductive objects are grounded, and maintain a low resistance to ground, the device will be stored in a metal, a conductive body of the product or charges on personnel quickly dissipated to the earth, in order to avoid accidents of electrostatic hazards. According to the relevant studies have shown that the presence of flammable vapors in the general workplace, insulated metal equipment / components, conductive products or personnel potential of the body itself must reach 100V or more, as may be due to the discharge and ignite surrounding combustible substances. Therefore, the plant will be insulated metal devices / components, a conductive ground the products to keep the ground resistance of less than 106Ω, the charge accumulation is sufficient to rapidly dissipated to the earth, but will itself electrostatic potential drops below 100V, to avoid electrostatic hazards incident occurred. Graphic LCD Display
(Two), increase the humidity to increase operating environment relative humidity of air, in the current manufacturing process of traditional industries is a common electrostatic hazard control methods. In high humidity (RH> 65%) environment, if the surface of the material is hydrophilic, is easily adsorbed moisture in the air, thereby reducing the surface resistance value of the material, increasing the rate of charge dissipation, minimize the degree of the charge accumulation . Such substances include cotton, paper and cellulose acetate. Factories manufacturing process often use humidifiers, watering the ground, or water vapor spray and other methods to increase the operating environment in the air relative humidity. If the non-hydrophilic surface of the material, the easy absorption of moisture in the air, causing not reduce the surface resistance value of the material and therefore can not increase the rate of charge dissipation. Such materials include synthetic polymers such part: ABS (Acrylonitrile-Butadiene-Styrene, Acrylic month Green - butadiene - styrene), Teflon (Teflon, fluorocarbon polymers), etc. Such high water repellent material needs to 80% relative humidity, or 90%, to effectively reduce the surface resistance value of the material, to minimize the degree of the charge accumulation.
(Three), antistatic material substance manufacturing process will be through the accumulation of static electricity dissipation pathways to the earth. If the conductive path is an insulating material (low conductivity) is static dissipation rate, if a conductive material conductive path (high conductivity) the electrostatic dissipation rate. Material surface resistivity less than 1011Ω/m2 or volume resistivity less than 1010Ωm, to avoid excessive accumulation of electrostatic material. Such substances called antistatic material. But containing flammable substances in the workplace, the antistatic material surface resistivity must be less than 108Ω/m2 or volume resistivity must be less than 106Ωm. For industrial processes using a variety of materials, via the following methods to make it antistatic material: the material itself has a static capacity (such as: cotton, wood, paper and soil, etc.) coated on the surface of the insulating material is antistatic material (such as toner, antistatic agents), the insulating material added during manufacturing a conductive or antistatic material (such as toner, a metal, an antistatic agent, a conductive fiber, etc.).