TFT belongs to the active matrix liquid crystal display, which is technically driven by the \"active matrix\" method. The method is to use the transistor electrode made by thin film technology, and use the scanning method to \"actively pull\" to control the open and close of any display point. When the light source illuminates, it is first revealed upward through the lower polarizer, and the liquid crystal molecule conducts light. The purpose of display is achieved by shading and transmitting light.