What is the principle of the liquid crystal display

- Jun 01, 2018 -


The composition and working principle of liquid crystal display (LCD): from the structure of LCD, whether it is a notebook screen or a desktop LCD display, the LCD panel used is a layered structure composed of different parts. The liquid crystal display consists of two plates, about 1mm thick, separated evenly by 5um containing liquid crystal material. Because the liquid crystal material itself does not shine, there is a light tube as the light source at the bottom of the display screen, and there is a backlight board (or a uniform plate) and a reflective film on the back of the LCD screen. The backlight plate is made up of fluorescent material and can emit light. The function of it is to provide a uniform backlight.

The light emitted by the backlight plate enters the liquid crystal layer containing thousands of liquid crystal drops after passing through the first layer of polarization filter layer.

The droplets in the liquid crystal layer are all contained in the tiny cell structure. One or more cells form a pixel on the screen. Between the glass plate and the liquid crystal material is a transparent electrode, the electrode is divided into rows and columns. In the crossing point of the row and column, the optical rotation state of the liquid crystal is changed by changing the voltage. The effect of the liquid crystal material is similar to that of a small light valve.

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