LCD is a display that uses liquid crystal as its material. Liquid crystal is a type of organic compound between solid and liquid. Under normal temperature conditions, it exhibits both liquid fluidity and optical anisotropy of crystals. It becomes transparent liquid when heated, and becomes crystalline after cooling. Turbid solid.
Under the action of an electric field, the arrangement of the liquid crystal molecules will change, which will affect the intensity of the incident light beam through the liquid crystal. This change in light intensity is further manifested as a change in light and dark through the action of the polarizer. Accordingly, through the control of the electric field of the liquid crystal, the brightness of the light can be changed, so as to achieve the purpose of information display. Therefore, the role of the liquid crystal material is similar to a small "light valve."
Because there are control circuits and drive circuits around the liquid crystal material. When the electrodes in the LCD generate an electric field, the liquid crystal molecules will be twisted, so that the light passing through it will be regularly refracted (the optical rotation of the liquid crystal material), and then filtered by the second layer of polarizer and displayed on the screen.
It is worth pointing out that because the liquid crystal material itself does not emit light, LCD usually needs to be equipped with additional light sources for the display panel. The main light source system is called "backlight module". Among them, the backlight plate is composed of fluorescent materials that can emit light. The main function of light is to provide a uniform backlight.