Patent ID: 7999768

Claim:
A method of driving an organic light emitting diode display, comprising: analyzing a digital data corresponding to an input image of a screen to analyze an accumulated density distribution for each gray scale range of the image which to be displayed on the screen; modulating the digital data of the input image to lower a tilt of a gamma curve corresponding to a pre-set high gray scale range among gamma curves of the input image if data belonged to the high gray scale range is determined as a dominant of the digital data of the input image according to the analyzed result; modulating the digital data of the input image to raise a tilt of a gamma curve corresponding to a specific gray scale range among gamma curves of the input image if data belonged to the specific gray scale range is determined as a dominant of the digital data of the input image as the analyzed result, wherein the specific gray scale range is set lower than the high gray scale range; and converting the modulated digital data of the input image into an analog signal, wherein an output gray value corresponding to max input gray is modulated to be lowered if data belonged to the high gray scale range is determined as a dominant of the digital data of the input image, wherein the tilt of the gamma curve corresponding to the pre-set high gray scale range is adjusted to a tilt that is lower than a reference tilt and higher than a tilt having a zero value if the data belonged to the high gray scale range is determined as the dominant of the digital data of the input image, and wherein a gamma curve of entire gray scale ranges corresponding to the digital data of the input image is determined depending upon the reference tilt which is differently set for each gray scale range.