Patent ID: 7365723

Claim:
A liquid crystal display, comprising: a signal controller, including a luminance controller processing input image data with respective grays such that the luminance represented by a predetermined gray of the input image data is about 80 cd/m 2 , and a gamma converter outputting output image data having a gamma characteristic adapted to a gamma 2.2 curve based on input image data, the gamma converter output being determined using a mathematical operation based on at least one difference curve and without using a look up table; a data driver selecting and outputting gray voltages corresponding to the image data from the signal controller; and, an inverter controlling a lamp such that the lamp emits light with luminance equal to or greater than 80 cd/m 2 , and wherein the at least one difference curve has intersecting linear and quartic portions, and a critical value where the linear and quartic portions intersect.