Video display driving method of LCD

A video display driving method of a liquid crystal display (LCD), the LCD comprising a liquid crystal display panel and a backlight module, wherein the liquid crystal display panel has a plurality of pixels distributed over a display surface of the liquid crystal display panel, a light source of the backlight module is projected onto the display surface of the liquid crystal display panel, the liquid crystal display panel receives a plurality of sets of video frame data and transforms each of the sets of video frame data into a preset-voltage signal and a post-set-voltage signal for driving the pixels during a frame time, a light source brightness of the backlight module presents a first average brightness while the preset-voltage signal is written into at least one of the pixels and presents a second average brightness while the post-set-voltage signal is written into the pixel, and the second average brightness is greater than the first average brightness, the method comprising a step of:

• performing a dynamic brightness control during the frame time;
• and
• adjusting the second average brightness according to a result of the dynamic brightness control.