With the development of technology, liquid crystal displays are more and more widely used in people's lives. With the development of liquid crystal display technology, there are more and more types of liquid crystal displays. However, all kinds of liquid crystal displays are driven in the same way, that is, by applying an electric field to change the arrangement of liquid crystal molecules, so that the phase retardation of light in the liquid crystal layer is changed to change the transmittance, thereby displaying different grayscale brightness. However, due to the purity of the liquid crystal and the alignment film, etc., the liquid crystal must be driven by polarity reversal when driving the liquid crystal, that is, the liquid crystal is driven by the opposite voltage at different times, otherwise the liquid crystal will be polarized, thereby affecting the display effect and even damaging the display. Moreover, the average values of the positive and negative polarities are mutually offset, that is, the applied voltage cannot have a direct current component. Therefore, when driving a liquid crystal display, it is necessary to make the positive and negative polarity voltages symmetrical with respect to VCOM (common electrode voltage). Ideally, the voltages we apply at both ends of the liquid crystal are symmetrical with respect to VCOM. However, due to the coupling between the circuits, there is often a certain deviation between the positive and negative voltages, causing the screen to flicker.

When producing an LCD panel, a VCOM adjustment is made in the module factory to optimize the panel's Flicker. Among them, Flicker is a numerical variable, the larger the value indicates the more serious the panel flicker, and the general panel has a VCOM value that can correspond to the Flicker minimum point, that is, the panel flashing condition is the best.