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Advantages And Characteristics Of LCD Liquid Crystal Screen

2022-12-17

Liquid Crystal Display is an organic compound made of long rod-shaped molecules. In the natural state, the long axes of these rod-like molecules are roughly parallel.

The first feature of the Liquid Crystal Display Module is that liquid crystal must be poured between two planes with fine grooves in order to work properly. The grooves on these two planes are perpendicular to each other (intersecting at 90 degrees), that is to say, if the molecules on one plane are arranged in the north-south direction, the molecules on the other plane are arranged in the east-west direction, and the molecules located between the two planes are arranged Forced into a 90 degree twist. Since the light propagates along the direction of the arrangement of the molecules, the light is also twisted 90 degrees when it passes through the liquid crystal. But when a voltage is applied to the liquid crystal, the molecules will rearrange vertically, so that the light can go out directly without any twisting.

The second feature of the LCD screen is that it relies on polarizing filters and the light itself. Natural light radiates randomly in all directions, and the polarizing filters are actually a series of thinner and thinner parallel lines. These lines form a net that blocks all light rays that are not parallel to these lines, and the lines of the polarizing filter are just perpendicular to the first one, so it can completely block those light rays that have been polarized. Only when the lines of the two filters are perfectly parallel, or the light itself has been twisted to match the second polarizing filter, can the light pass through.

The LCD screen is composed of two polarized filters perpendicular to each other, so under normal circumstances it should block all the light that tries to pass through. However, since the two filters are filled with twisted liquid crystals, after the light passes through the first filter, it will be twisted 90 degrees by the liquid crystal molecules, and finally pass through the second filter. On the other hand, if a voltage is applied to the liquid crystal, the molecules will be rearranged and completely parallel, so that the light will no longer be twisted, so it is just blocked by the second filter. In short, the light is blocked when the power is applied, and the light is emitted when the power is not applied. Of course, it is also possible to change the arrangement of liquid crystals in the LCD, so that the light is emitted when the power is applied, and is blocked when the power is not applied. But since the LCD screen is almost always on, only "power up" will block the light.

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