Patent ID: 7696967

Claim:
A gamma control circuit comprising: a first gray-scale voltage selection unit for selecting and outputting a highest gray-scale voltage and a lowest gray-scale voltage from among a plurality of first voltages present between a first supply voltage and a second supply voltage; a second gray-scale voltage selection unit receiving the highest and the lowest gray-scale voltages, and selecting and outputting a first intermediate voltage and a second intermediate voltage from among a plurality of second voltages present between the highest and the lowest gray-scale voltages; a third gray-scale voltage selection unit receiving the highest and the lowest gray-scale voltages and receiving the first and second intermediate voltages, and generating a plurality of reference voltages based on the received voltages; and a gray-scale voltage generation unit receiving the highest and lowest gray-scale voltages and receiving the plurality of reference voltages, and outputting a plurality of gray-scale voltages based on the received voltages, wherein the first gray-scale voltage selection unit comprises: a first resistor array connecting the first and second supply voltages to generate the plurality of first voltages, the first resistor array being without variable resistance; a first voltage selector selecting one from among the plurality of first voltages in response to a first control signal and outputting the selected voltage as the highest gray-scale voltage; and a second voltage selector selecting one from among the plurality of first voltages in response to a second control signal and outputting the selected voltage as the lowest gray-scale voltage.