Patent ID: 7095395

Claim:
A gamma correction apparatus for outputting a corresponding pixel voltage according to a pixel signal for a liquid crystal display (LCD), wherein the LCD has a plurality of pixels used to display a plurality of colors, the gamma correction apparatus comprising: a gray-scale voltage generating circuit, which comprises: a common gray-scale voltage generating circuit for generating a plurality of common gray-scale voltages; and a plurality of individual gray-scale voltage generating circuits, coupled to the common gray-scale voltage generating circuit, wherein each of the individual gray-scale voltage generating circuits generates a plurality of individual gray-scale voltages corresponding to one of the colors, and the values of the individual gray-scale voltages generated by each individual gray-scale voltage generating circuit are determined according to what color the individual gray-scale voltage generating circuit corresponds to; and a gamma correction circuit, coupled to the common gray-scale voltage generating circuit and the individual gray-scale voltage generating circuits, wherein according to a corresponding color of the pixel signal, the gamma correction circuit generates the corresponding pixel voltage based on the common gray-scale voltages and the corresponding individual gray-scale voltages of the corresponding color.