Detailed overview of TFT-LCD driving principle part one

TFT-LCD is the abbreviation of thin film transistor-liquid crystal display in English. TFT-LCD technology is a technology that cleverly combines microelectronics technology and liquid crystal display technology. People use the technology of fine microelectronics processing on si and transplant it to the processing of TFT arrays on large-area glass. Then the array substrate and another substrate with a color filter film are used to form the mature LCD technology. A liquid crystal box is combined, and then goes through post-processing such as polarizer pasting and other processes, and finally forms a liquid crystal display.

As we all know, the working principle of CRT is that after power is applied, the filament heats up, the cathode is excited, and a flow of electrons is emitted. The electron flow is accelerated by the internal metal layer with high voltage, and is focused by the lens to form an extremely fine electron beam, which hits the fluorescent screen. Make the phosphor glow. The principle of LCD is completely different from that of CRT. COG LCD needs light source from behind. When the light beam passes through this layer of liquid crystal, the liquid crystal will be side by side or irregularly twisted. Therefore, the liquid crystal is more like a gate. We can choose whether the light penetrates or not. See images of different shades and staggered patterns on the screen.