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TFT LCD manufacturing process

Views: 207     Author: Reshine Display     Publish Time: 2023-08-24      Origin: Site

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TFT LCD manufacturing process

LCD TFT It is no accident that the display industry has become the norm; whether it be due to the full color, life, or light-emitting efficiency, it has produced brilliant results but has also deepened. Then, into what distinct sections is its manufacturing process specifically divided? Please allow me to quickly introduce the following Reshine Display:


The formation of TFT arrays on the TFT substrate, the formation of a color filter pattern on the color filter substrate, the formation of a conductive layer with two substrates to form a liquid crystal box, the installation of peripheral circuits, the assembly of backlighting, and other module assembly are all components of the TFT LCD manufacturing process. 


1. In the TFT substrate to form the TFT array process

Amorphous silicon (a-si), polycrystalline silicon (p-si), and monocrystalline silicon (c-si) are the current industrialized TF types. The a-si tft is still the most popular at the moment. The first borosilicate glass substrate sputtering gate material film, mask exposure, development, and dry etching to create the gate wiring pattern are all parts of the a-si TFT manufacturing process.


using a step exposure machine to expose a mask generally. The PVCD method for continuous film formation is used in the second step to creating sinx film, non-doped a-si film, and phosphorus-doped n+a-si film. The a-si patterns are then created in the TFT section using dry etching and mask exposure. The third step is to use a sputtering film formation method to create a transparent electrode (ito film), followed by mask exposure and wet etching to create a display electrode pattern. The contact hole pattern of the insulating film at the gate terminal is formed in the fourth step using mask exposure and dry etching. The fifth step involves sputtering al to form a film and mask exposure and etching to form the TFT's source, drain, and signal line patterns. The protective film is used to protect the gate as well as the end of the signal line electrode and the display electrodes. Next, the protective film is exposed to dry etching for etching. This completes the pecvd method. The process is finished at this point.


The TFT array process, which also requires the biggest equipment investment, is essential to the production of TFT-LCDs. The entire procedure must be carried out under extremely strict purification standards (such as class 10).


2. In the color filter (cf) substrate to form a color filter pattern process

The formation method's color filter coloring section includes dye, pigment dispersion, printing, electrolytic deposition, and inkjet methods. The predominant technique at the moment is the pigment dispersion method.


The pigment dispersion method begins with uniformly dispersing fine pigments (with an average particle size of less than 0.1 m) in a clear photopolymer resin. Then, in order, they are coated, exposed, and developed to create the r. g. b. tri-color pattern. Manufacturing employs photo-etching technology, primarily using coating, exposure, and development equipment.


A black matrix (bm) is typically added to the RGB three-color junction to prevent light leakage. There have been changes to the metal chromium and chromium oxide composite bm film or resin mixed carbon resin type bm, which were previously formed using more sputtering techniques.


Because the substrate with a color filter is used as the front substrate of the liquid crystal screen and the back substrate with tft combined with the composition of the liquid crystal box, it is also necessary to make a layer of protective film on the bm and the formation of it0 electrodes. For each unit of the color filter to correspond to each pixel of the TFT substrate, consideration must be given to the positioning issue.


TFT LCD Display Liquid Crystal Panel's Structural Makeup

TFT LCD must be produced in conjunction with other components as a whole. The manufacturer of TFT LCD, connectors, drive circuit PCB circuit boards, backlight unit, and other components with steel plate closed up, leaving only the backlight plug and drive circuit input socket. This was done due to the special characteristics of TFT LCD, as well as the need for connecting and assembling the need for special tools, coupled with the difficulty of the manipulation technology, etc.


An LCD Module (LCM), also known as a liquid crystal board, liquid crystal panel, etc., is the name of this component. It is a liquid crystal display module. As can be seen, this component's design not only improves the work's dependability but also guards against user-caused damage from haphazard disassembly. The production of the entire machine is also greatly simplified because LCD panel manufacturers only need to connect the driver circuit plug and the backlight plug to the external circuit board. Here are our TFT LCD Displays.


The backlight in the LCD panel generally requires high voltage. Therefore, in the LCD panel, high voltage is generated by the high voltage board circuit (also called inverter) outside the panel and sent to the backlight through the high voltage plug. Depending on the size of the LCD screen size and the different display requirements, the number of backlights is different. For example, the early liquid crystal display used a lamp, generally located in the upper part of the screen, and then gradually developed into two lamps, each on and off each one, now The laptop computer display is more often used in this way; Currently, some of the larger size of the desktop computer LCD screen using four lamps, the high true large screen display is used six, eight or even more lamps. LCD panel outside the motherboard circuitry through the panel wiring and panel interface connection, different LCD panels, using different forms of interface, mainly 17L interface, LVDS interface. The specific content of the panel interface will be in subsequent chapters of the specific first. LCD panel is also equipped with several PCB blocks, the distribution of its timing controller (TC0N, this chip is sometimes referred to as the screen display IC), line driver, column driver, and other components.

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