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>> What are the main features of LCD screens? 18th,May,2018
The LCD liquid crystal display is based on a liquid crystal material, and a liquid crystal material is filled between two parallel plates to change the arrangement of molecules inside the liquid crystal material by voltage to achieve the purpose of shading and light transmission to display different shades of light. , Patchwork images, and as long as the three-color filter layer added between the two panels, you can achieve the display of color images. The power consumption of LCD is very low, so it is favored by engineers and is suitable for electronic devices using batteries.
The first characteristic of the LCD screen is that the liquid crystal must be poured between two flats with fine grooves to work properly. The grooves in the two planes are perpendicular to each other (90 degrees), that is, if the molecules in one plane are aligned in the north-south direction, the molecules in the other plane are arranged in the east-west direction, and the molecules located between the two planes are Forced into a 90-degree twisted state. Because the light travels in the direction of the molecules, the light is also twisted 90 degrees when passing through the liquid crystal. However, when a voltage is applied to the liquid crystal, the molecules are re-arranged vertically so that the light can be emitted directly without any twisting.
The second characteristic of the LCD screen is that it depends on the polarizing filter and the light itself, natural light is randomly scattered in all directions, and the polarizing filter is actually a series of increasingly fine parallel lines. These lines form a net that blocks all light that is not parallel to these lines. The lines of the polarizing filter are exactly perpendicular to the first, so they can completely block those rays that have been polarized. Only if the lines of the two filters are completely parallel, or the light itself has been twisted to match the second polarizing filter, the light can penetrate.
The LCD screen is composed of such two polarizing filters that are perpendicular to each other. Therefore, under normal circumstances, all light that tries to penetrate should be blocked. However, because the two filters are filled with twisted liquid crystals, after passing through the first filter, the liquid crystal molecules are twisted by 90 degrees, and finally pass through the second filter. On the other hand, if a voltage is applied to the liquid crystals, the molecules will be rearranged and completely parallel, so that the light is no longer twisted, so it is blocked by the second filter. In short, light is blocked by power-up, and light is emitted without power. Of course, it is also possible to change the arrangement of the liquid crystals in the LCD so that light is emitted when it is powered on and is blocked when it is not powered. However, since the LCD screen is almost always lit, only the power supply will be blocked.
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