Simply put, the basic principle of screen display is to fill two parallel plates with liquid crystal material. By changing the arrangement of molecules in the liquid crystal material with voltage, different shadows and uniform images are displayed, thus achieving the purpose of shading and translucency. Also, a color image can be displayed by adding a three-color filter layer between the two plates.

Understand its structure and principle only, understand its technology and craft characteristic, ability has clear goal from time to time in choose and buy, when using and maintain more scientific and reasonable. Liquid crystals are organic compounds made up of long rod-like molecules. In nature, the long axes of these rod-like molecules are roughly parallel. The first feature of an LCD is that the liquid crystal must be injected between two flat surfaces with thin grooves to work properly. The slots on the two planes are perpendicular to each other (90 degrees), that is, if the molecules are aligned in a plane in a north-south direction, the molecules on the other planes are aligned in an east-west direction, and the molecules between the two planes are forced to twist 90 degrees. As light travels along the molecular sequence, it is also flipped 90 degrees as it passes through the liquid crystal. But when a voltage is applied to the liquid crystal, the molecules align vertically so that light can shine straight out without any distortion.

A second feature of LCDS is that they rely on polarized filters and light itself, with natural light scattering randomly in all directions. A polarization filter is actually a series of parallel lines that get thinner and thinner. These lines form a network that blocks all light rays that do not line the lines. The line of the polarizing filter is just perpendicular to the first line, which completely blocks polarized light. Light can only penetrate if the lines of the two filters are perfectly parallel or if the light itself is distorted to match the second polarized plate. For one thing, an LCD consists of two polarized filters that are perpendicular to each other, so under normal circumstances all light trying to penetrate should be blocked.

However, because the liquid crystal between the two filters is distorted, the liquid crystal molecules distort 90 degrees after the light passes through the first filter and eventually passes through the second filter. On the other hand, if you apply a voltage to the liquid crystal, the molecules rearrange themselves, perfectly parallel, so that the light doesn't distort anymore and is blocked by a second filter. In short, when electricity is on it blocks light, and when it is not, it emits light. Of course, it can also change the alignment of the liquid crystals in the LCD so that light can be emitted when the power is on, but not blocked when it is on. But because the LCD screen is almost always on, only the "power will block the light" solution achieves the most energy savings.