Patent ID: 8902142

Claim:
A liquid crystal display comprising: a signal controller which converts a first image signal having a first gray level based on an original gamma coefficient into a second image signal having a second gray level based on a target gamma coefficient; a liquid crystal panel which displays an image based on the second image signal; and a light-emitting unit which provides light to pixels of the liquid crystal panel, wherein the target gamma coefficient is less than the original gamma coefficient, and a luminance of the light provided by the light-emitting unit is adjusted to minimize an amount of luminance distortion of real luminance of the displayed image from ideal luminance at the original gamma coefficient, wherein the amount of luminance distortion is equal to a sum of squared products of a number of the pixels at each gray level of the image and a difference between a real luminance and an ideal luminance at each gray level of the image, wherein each of the pixels is divided into a red subpixel, a green subpixel and a blue subpixel, and wherein the real luminance at each gray level of the image is equal to a sum of light transmittances of each of the red subpixel, the green subpixel and the blue subpixel multiplied by a ratio of an adjusted luminance of the light to a maximum luminance of the light which can be provided by the light-emitting unit.