Patent ID: 7176867

Claim:
A method of driving a liquid crystal display by frame rate control (FRC), the method comprising: receiving a raw data having a gray from an external graphic source; converting the raw data such that the gray of the converted data for the raw data having the gray equal to any one of a predetermined number of lowermost grays is equal to a predetermined gray, and the gray of the converted data for the raw data having the gray other than the predetermined number of lowermost grays is equal to the gray of the raw data subtracted by the predetermined number; and performing FRC on the converted data, wherein the predetermined number is equal to (2 α−1 ), where α is bit number of lower bits of the raw data required for the FRC, wherein the FRC is performed such that first 2 α−1 frames and second 2 α−1 frames for first-type lower bits of the converted data required for the FRC, which have a lowest bit of zero, are substantially the same, and first 2 α−1 frames for second-type lower bits of the converted data, which have a lowest bit of one, are the same as the first 2 α−1 frames for the lower bits, which have a value less than the second-type lower bits by one, and second 2 α−1 frames for the second-type lower bits are the same as the second 2 α−1 frames for the lower bits, which have a value larger than the second-type lower bits by one, where α is bit number of the lower bits of the converted data required for the FRC.