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LCD screens are widely used in our lives. Jingyao mainly shares with you the display principle and color display method of LCD screens.
paste the polarization plate on the two upper and lower glass substrates injected with liquid crystal, what is attached to the upper substrate is called photon detection, and what is attached to the lower substrate is called partial photon, and the optical axis of the upper and lower polarization plates is orthogonal.
The polarizer only allows light vibrating in one direction to pass through. Now, the voltage applied to the liquid crystal is 0 V, and the liquid crystal molecules in the liquid crystal cell are arranged along the friction channels of the alignment film of the upper glass substrate at the interface respectively, and the friction channel along the oriented film of the underlying glass substrate. Thus, the liquid crystal molecules on the surface of the upper and lower glass substrates of the LCD screen are arranged into the twisted 90 ° State of the above figure.
Due to this state, when the light emitted by the backlight passes through the polarizer below, only the light vibrating in one direction can pass through. Then, according to the arrangement of liquid crystal molecules in the LCD screen, it is reversed to reach the upper polarizer.
Here, the alignment of the irradiated smooth LCD liquid crystal molecules is twisted by 90 degrees, and the polarization plate passes in parallel. At this time, the state of passing light is defined as 'white '.
on the LCD, the applied voltage will change the liquid crystal molecular arrangement in the LCD screen. If the axis direction of the upper and lower polarizer is 90 degrees, whether the light in only one direction can pass through the LCD screen depends on whether there is applied voltage or not, and whether it has passed or not determines 'white' and 'black ', the image is displayed on the LCD screen.
of course, the intermediate colors of 'white' and 'black' are determined by the intermediate point of the applied voltage. As mentioned above, when the axial direction of the upper and lower polarizer is 90 °, the irradiation light can pass through when there is no applied voltage, and it is 'white' at this time, while when there is applied voltage, when the irradiated light is cut off, it is 'black'. Such liquid crystal type is called normal white LCD. SFT mode is similar to TN mode.
there is a color film substrate outside the LCD display (CF substrate) , When the light passing through the array substrate passes through the CF substrate, it will be colored. In fact, one pixel of LCD is divided into RGB 3 primary colors ,(Red, green, blue) , And each through the corresponding RGB color film to get coloring. Divide pixels into red in color display (R), Green (G), Lan (B), The three colors together are called pixels (PIXEL) , Each pigment R, G, B is called sub-pixel. This kind of LCD color display is an additive mixing method that uses color film to mix RGB light to obtain various colors.
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