To put it simply, the basic principle that the screen can display is to fill the liquid crystal material between the two parallel plates, and then use voltage to change the arrangement of the molecules inside the liquid crystal material, so as to achieve shading and light transmission. The purpose is to display images with different shades and staggered patterns, and as long as a ternary color filter layer is added between the two plates, a color image can be displayed.
The LCD liquid crystal display (Liquid Crystal Display) is constructed by placing liquid crystal material between two parallel pieces of glass. There are many small vertical and horizontal wires in the middle of the two pieces of glass, and the rod-shaped structure is controlled by whether it is energized or not. The crystal molecules change direction and refract its light to produce a picture. It is much better than CRT, but its price is more expensive.
Liquid crystal is an organic compound composed of long rod-shaped molecules. In the natural state, the long axes of these rod-shaped molecules are roughly parallel.
A feature of LCD liquid crystal screens: liquid crystal must be poured between two planes with fine grooves to work normally. The grooves on these two planes are perpendicular to each other (intersect at 90 degrees), so that is to say, if the molecules on one plane are arranged in north-south direction, the molecules on the other plane are arranged in east-west direction, and they are located in two planes. The molecules in between will be forced into a 90-degree twisted state. Since the light travels along the direction of the arrangement of the molecules, the light will also be twisted 90 degrees when passing through the liquid crystal. But when a voltage is applied to the liquid crystal, the molecules will be arranged vertically again, so that the light can be directed out without any twisting.
The second feature of LCD: It relies more on the polarized filter and the light itself. Natural light is emitted randomly in all directions. The polarized filter is actually a series of increasingly thinner parallel lines. These lines form a net, blocking all light that is not parallel to these lines, and the line of the polarization filter is also perpendicular to Di, so it can completely block those polarized light. Only when the lines of the two filters are completely parallel, or the light itself has been twisted to match the second polarized filter, the light can penetrate. LCD is composed of such two polarized filters that are perpendicular to each other, so under normal circumstances, all rays that try to penetrate should be blocked. However, because the two filters are filled with twisted liquid crystals, when the light passes through one filter of Di, it will be twisted by liquid crystal molecules by 90 degrees, and Zui will then pass through the second filter. . On the other hand, if a voltage is applied to the liquid crystal, the molecules will rearrange and be completely parallel, so that the light will not be twisted, so it happens to be blocked by the second filter. In short, the light can be blocked when power is applied, and the light can be emitted when the power is not applied. Of course, it is also possible to change the arrangement of the liquid crystals in the LCD screen so that the light will be emitted when power is applied, but will be blocked when power is not applied.
