System and method for adjusting pure color frame brightness of RGBW panel

The invention discloses a system and method for adjusting pure color frame brightness of an RGBW panel, and relates to a system and method for adjusting the pure color frame brightness of a liquid crystal display panel. A problem to be solved is a display defect that the frame of a RGBW frame panel is dark in the prior art. The system comprises a detection unit which is set to detect the brightness of each frame pixel of a pure color frame when the RGBW panel displays the pure color frame, then calculates the mean brightness value of the pure color frame according to the detected brightness of each frame pixel, compares the mean brightness value with a preset mean brightness target value, and obtains a brightness gain value. The system also comprises a calculation unit which is set to calculate a current gain value according to the brightness gain value; and a backlight drive unit which is set to adjust the backlight voltage or backlight current outputted to a power supply channel of a backlight source accord