Patent ID: 8899772

Claim:
An LCD device comprising: a backlight module comprising: a light guide plate comprising a light emitting surface, a bottom surface opposite to the light emitting surface, and protrusions on the bottom surface, the light guide plate comprising a light-mixing part and a light-homogenized part connected to the light-mixing part, wherein a density of the protrusions in the light-mixing part is greater than a density of the protrusions in the light-homogenized part; and a plurality of light sources positioned adjacent to the light-mixing part and away from the light-homogenized part relative to the light-mixing part; a liquid crystal layer positioned above the light emitting surface, and comprising an adjustable part corresponding to the light-mixing part and a nonadjustable part corresponding to the light-homogenized part; a brightness detecting module configured for acquiring a brightness distribution data of the liquid crystal layer; and a control unit configured for obtaining the brightness distribution data from the brightness detecting module and adjusting a brightness of the adjustable part to make the brightness of the adjustable part coincide with a brightness of the nonadjustable part according to the brightness distribution data.