The basic principle of how the LCD screen can display is to fill liquid crystal material into two parallel plates. Voltage makes LCD screen change arrangement of molecules inside the liquid crystal material to Shading and light transmission and that will show the light and shadow of images. If ternary filter layer are added into the two parallel plates, color images will show in the screen.
knowing it’s basic principle and structure, it’s technology and process characteristics, so that you can purchase a better one. Liquid crystal is an organic compound composed of long rod-shaped molecules. Usually, the long axes of these rod-shaped molecules are almost parallel.
The first feature of LCD screen is that liquid crystal has to be poured into two planes with fine grooves to work normally. The grooves on the two planes are perpendicular to each other. In other word, if the molecular in one plane is north-south arrangement, the other one of molecular of plane should be east-west arrangement. And the molecular between the two planes are forced to a situation that they are 90 degree twist. Since light’s transmission is following the arrangement direction of the molecular, If light passes liquid crystal, it will be 90 degree twist too. But when liquid crystal is applied to a voltage, the molecules are vertically aligned so that the light can be directed out without any twisting.
The second feature of LCD screen is it very rely on polarizing filter and light, and please note that natural light is randomly scattered in all directions.