Patent ID: 7312776

Claim:
An apparatus configured in a liquid crystal display (LCD) for converting a digital pixel signal to a gamma voltage signal, wherein the gamma voltage signal is for application to a pixel, the pixel for displaying a predetermined color with an intensity according to the gamma voltage signal, the displaying color of the pixel being one of a group of colors, pixels for displaying the respective colors reaching respective maximum light luminances at respective maximum gamma voltages for the respective colors, the digital pixel signal being an M-bit binary signal and having a range of magnitude independent of the color of the displaying color of the pixel, the apparatus comprising: a pixel signal converting device for converting the digital pixel signal to a converted pixel signal, wherein the relation between the digital pixel signal and the converted pixel signal is determined according to the displaying color of the pixel, the magnitude of the converted pixel signal has a range determined according to the displaying color of the pixel, and the range of magnitude of the converted pixel signal with respect to the displaying color of the pixel depends on the maximum gamma voltage at which the pixel reaches the maximum light luminance with respect to the displaying color of the pixel; and a gamma correcting device coupled to the pixel signal converting device for outputting the gamma voltage signal according to the converted pixel signal, wherein when the converted pixel signal indicates a maximum value in the range of magnitude with respect to the displaying color of the pixel, the gamma voltage signal is the maximum gamma voltage at which the pixel reaches maximum light luminance with respect to the displaying color of the pixel.