GAMMA VOLTAGE GENERATION CIRCUIT, DRIVING UNIT, DISPLAY DEVICE, AND COLOR COORDINATE ADJUSTMENT METHOD

摘要

A gamma voltage generation circuit, driving unit, display device, and color coordinate adjustment method. The gamma voltage generation circuit comprises: a voltage reducing unit (21), configured to reduce the voltage of an inputted source voltage (AVDD/AVEE) so as to acquire an initial voltage (VGMN/VGMP) of the gamma voltage; a voltage dividing unit (22), configured to divide the voltage of the initial voltage (VGMN/VGMP) of the gamma voltage so as to generate various levels of gamma voltages (GMA1-GMA255); a voltage increasing unit (23), configured to generate an additional voltage signal (Ven), wherein the additional voltage signal (Ven) is configured to be superimposed on the initial voltage (VGMN/VGMP) of the gamma voltage. The gamma voltage generation circuit can adjust a color coordinate such that a display effect of a display device is consistent and luminance of a white picture will not be reduced, thus addressing the problem of inconsistent display effects of a display device caused by differences in materials and processes among suppliers providing a display panel and a backlight module.