Patent ID: 7358947

Claim:
A device for driving a liquid crystal display, the device comprising: a gray voltage generator to generate a plurality of gray voltages corresponding to input gray values, wherein a gray voltage range is wider than a target pixel voltage range; an image signal processor to process a current image data on the basis of a difference between the current image data and a previous image data; and a data driver to apply a first gray voltage selected from a first gray voltage range when the current image data relates to a motion image or a second gray voltage selected from a second gray voltage range when the current image data relates to a still image to the pixel, based on the processed current image data, wherein the first gray voltage range is the same as the gray voltage range and the second gray voltage range is different from and included in the first gray voltage range, the processed current image data having a number of gray values that is smaller than the number of input gray values when the current image data relates to the still image.