Technology of LCD
Author:Li Chunxi Time:2021-07-20 17:56 Browse(306)
1. Structure of LCD
1. Structure of liquid crystal display.

Technology of LCD

TFT-LCD consists of upper substrate assembly, lower substrate assembly, liquid crystal, driving circuit unit, backlight module and other accessories. The lower substrate assembly mainly includes lower glass substrate and TFT array, while the upper substrate assembly consists of upper glass substrate, polarizing plate and film structure covered on the upper glass substrate, and liquid crystal is filled on the upper and lower glass substrates Figure 1.1 shows the typical structure of color TFT-LCD.
Figure 1.2 further shows the structure of backlight module and driving circuit unit.
on the inner side of the lower glass substrate.
there are a series of conductive glass microplates corresponding to display pixels, TFT semiconductor switching devices and vertical and horizontal lines connecting semiconductor switching devices, They are all formed by microelectronic manufacturing processes such as lithography and etching. The sectional structure of TFT semiconductor devices for each pixel is shown in Fig. 1.3.
a transparent conductive glass plate is coated on the inner surface of the upper glass substrate, which is generally made of indium tin oxide (ITO), As a common electrode, it forms a series of electric fields with many conductive microplates on the lower substrate.
as shown in Fig. 1.4.
if the LCD is color.
there are three primary color (red, green, blue) filter units and black spots between the common conductive plate and the glass substrate, in which the black spot is used to prevent light from leaking from the gap between the pixel points. It is made of opaque material, Therefore, it is called black matrix.
2 the manufacturing process of LCD.
the manufacturing process of color TFT-LCD mainly includes four sub processes: TFT process, color filter process, cell process and module process [1] [2].
2The relationship between the sub processes is shown in Figure 2.1
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