Working principle of active matrix LCD
The structure of the TFT-LCD liquid crystal display is basically the same as that of the TN-LCD liquid crystal display, except that the electrode on the upper layer of the TN-LCD is changed to an FET transistor, and the lower layer is changed to a common electrode.
The working principle of TFT-LCD liquid crystal display is different from that of TN-LCD. The developing principle of TFT-LCD liquid crystal display is to adopt "back-illuminated" illumination. When the light source is irradiated, it first penetrates upward through the lower polarizer and transmits light by means of liquid crystal molecules. Because the electrodes on the upper and lower interlayers are changed to FET electrodes and common electrodes, the arrangement state of liquid crystal molecules will also change when the FET electrodes are turned on, and the purpose of display is also achieved by shading and light transmission. But the difference is that due to the capacitive effect of the FET transistor, it can maintain the potential state. The liquid crystal molecules that have previously been transmitted will remain in this state until the FET electrode is powered on again to change its arrangement.
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