To put it simply, the basic principle that the LCD display screen can realize the display is to fill the liquid crystal material between the two parallel plates, and then change the arrangement of the molecules inside the liquid crystal material by voltage, so as to achieve light shading and transparency. The purpose of the light is to display images with different shades and staggered patterns, and as long as a filter layer of three primary colors is added between the two flat plates, a colorful image can be displayed.
Its construction consists of placing a liquid crystalline material between two parallel sheets of glass. There are many vertical and horizontal thin wires in the middle of the two pieces of glass, and the rod-shaped crystal molecules are controlled by whether it is electrified or not, so as to change the direction so that the picture can be produced by the refraction of light. LCD display monitors are much better than CRT, but the price is more expensive.
A liquid crystal is an organic compound composed of long rod-shaped molecules. In their natural state, the long axes of these rod-like molecules are roughly parallel.
1. The liquid crystal must be poured between two planes with thin grooves to work normally. The slots in these two planes are perpendicular to each other (90-degree intersection). That is to say, if the molecules on one plane are aligned north-south and the molecules on the other plane are aligned east-west, the molecules located between the two planes will be forced into a 90-degree twist.
Since light travels in the direction of the alignment of the molecules, the light is also twisted 90 degrees as it passes through the liquid crystal. But when a voltage is applied to the liquid crystal, the molecules are re-aligned vertically so that the light can go straight out without any twisting.
2. LCD display monitors rely more on polarized filters and the light itself. Natural light is scattered randomly in all directions, and the polarizing filter is actually a series of increasingly thin parallel lines. The lines form a net that blocks all light that is not parallel to the lines. The line of the polarizing filter is also exactly perpendicular to the first one, so it completely blocks the light that is already polarized.
Only if the lines of the two filters are perfectly parallel, or if the light itself has been twisted to match the second polarizing filter will the light penetrate. The LCD display screen is composed of such two mutually perpendicular polarized filters, so under normal circumstances, all the light that tries to penetrate should be blocked.
However, since the two filters are filled with twisted liquid crystals, when 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. out. 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 not be twisted any more, so it is just blocked by the second filter.
In short, power on can block light, and no power can let light out. Of course, it is also possible to change the arrangement of the liquid crystals in the LCD display screen, so that the light is emitted when it is powered on, and will be blocked when it is not powered on.
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