Patent ID: 8836733

Claim:
A gamma voltage controller, comprising: a gamma divider generating a plurality of voltages through voltage division between a first gradation voltage and an N th gradation voltage; a gamma selection unit including first through M th gamma selectors which select first through M th gamma voltages from among the plurality of voltages, and outputting the selected first through M th gamma voltages; a gamma buffering unit buffering the selected first through M th gamma voltages, and outputting first through M th gamma buffer voltages; a mode selector selecting a color mode of a display panel; and a gradation controller responding in correspondence with the selected color mode and compensating for luminance in high gradations and luminance in low gradations by selecting one of the first gamma buffer voltage or the first gradation voltage and selecting one of the M th gamma buffer voltage or the N th gradation voltage, and by generating second through (N−1) th gradation voltages.