What is TFT-LCD

As shown in Fig. A, a TFT-LCD is made up of color filter (CF), TFT array and backlight module.


Fig. A. TFT-LCD Structure




In the TFT-LCD, liquid crystal molecules are injected between the two transparent electrodes. The intensity of an electric field across the liquid crystal layer is adjusted by the voltage applied to the pixel electrode, which can further modulate the strength of the incident light and produce a gray level screen between full bright and full dark. Each individual pixel of a TFT-LCD needs one set of TFT to control its voltage. To produce different colors in the lights generated by the backlight module and passing the liquid crystal, red, blue, and green color resists need to be coated on the CF glass to produce the full color effect combined with the gray level. Once the TFT array and CF substrate have been produced, liquid crystal is injected between the top CF layer and the bottom TFT layer. The two layers are then laminated together. A polarizer is then attached as the final step. Together these form the “LCD process”.


The final “LCM process” shown in Fig. B consists of the JI process for connecting the driver IC and control circuit board (PCBA) to the glass substrate, followed by assembly of the backlight module (MA Process). Finally, the module undergoes illumination testing, as shown in Fig. B.


Fig. B. TFT-LCD Module Production Process





To learn more about the TFT-LCD process, please click here and refer to this animation.

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