One of the biggest weaknesses of TFT display with analog interface is the phenomenon of pixel flicker when it is displayed, which is due to the fact that the clock frequency is not 100% synchronous with the input analog signal, resulting in the flicker of a few pixels. This is more obvious when displaying characters and lines. However, the TFT of digital interface does not have the problem of tuning clock frequency to analog signal, which means that the TFT-LCD of digital interface only needs to adjust brightness and contrast. The specific comparison is shown in table 2. There is no analog-to-digital conversion in the advantages of digital interface analog interface. The signal attenuation in the process of digital-to-analog conversion does not need clock frequency, and the adjustment price of vector is cheap. It reduces the full compatibility of the corresponding circuits and components with the current computer standard VGA video signal interface, which does not require the purchase of special video card shortcomings. At present, there are at least three interface standards (P ≤ D, DFP and DVI) that need display cards with digital video to cooperate with the clock frequency in order to avoid the occurrence of pixel flicker. The signal transmitted in the cable whose vector is exactly the same as the analog signal is vulnerable to interference. The circuit responsible for analog-to-digital conversion cannot be upgraded to the digital interface if the circuit responsible for analog-to-digital conversion is added to the display.