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.