LED backlight system of LCD panel

The backlight system includes a backlight plate, a backlight source (CCFL or LED), a dispersion plate (used to distribute light uniformly), a dispersion sheet, and so on. Since the liquid crystal does not emit light, it needs to be illuminated by other light sources. This is the role of the backlight system. However, the current CCFL tubes or LED backlights do not have the characteristics of a surface light source. Therefore, light guide plates and dispersion sheets are required. This kind of component makes the light of linear or point-shaped light source uniform to the entire surface. The purpose is to make the luminous intensity of different points on the entire surface of the LCD panel be the same. However, it is very difficult to achieve the ideal situation in practice, and it can only reduce the brightness as much as possible. The non-uniformity of the backlight system has a great test for the planning and workmanship of the backlight system.

The LCD panel is translucent when it is not powered

The flexible printed board that can be bent plays the role of signal transmission, and the printed circuit board (part of the blue PCB board) is pressed and connected through anisotropic conductive glue to connect the two

From the outside to the inside of the LCD panel, there are degree polarizer, colorful filter, liquid crystal, TFT glass, and straight polarizer. In addition, there are driver IC and printed circuit board beside the LCD panel, which are mainly used to control the liquid crystal in the LCD panel. Transmission of molecular rotation and flashing signals. The liquid crystal panel is very thin and is semi-transparent when it is not energized. Its general structure is like a sandwich. The base TFT glass and the upper colorful filter sandwich the liquid crystal in the center.

Microscopic LCD panel, you will see red, green and blue as a group of three primary colors, generally one group or two groups are one pixel

Liquid crystal has the light refraction properties of solid crystals, together with liquid activity characteristics. Driven by the electrodes, it can be placed in the way the master wants to control the intensity of light transmission, and then on the colorful filter, Stop the color adjustment of each pixel through the three primary colors of red, green, and blue, and finally get a flawless image.