Patent ID: 7187375

Claim:
An apparatus for generating gamma voltage, comprising: a plurality of gamma set generators to generate a plurality of gamma voltage sets that include gamma voltages having different voltage levels from each other, each gamma voltage set corresponding with a respective brightness mode corresponding to a brightness of an operational environment, wherein the plurality of gamma set generators includes a red gamma voltage generator to generate a plurality of red gamma voltage sets, a green gamma voltage generator to generate a plurality of green gamma voltage sets, and a blue gamma voltage generator to generate a plurality of blue gamma voltage sets; and a gamma set selector to select any one of the gamma voltage sets in response to the brightness mode and to drive data lines of a display device in accordance with the selected gamma voltage set wherein the gamma set selector includes a first multiplexor to select one of the red gamma voltage sets in accordance with the brightness mode to output the selected red gamma voltage set, a second multiplexor to select one of the green gamma voltage sets in accordance with the brightness mode to output the selected green gamma voltage set, and a third multiplexor to select one of the blue gamma voltage sets in accordance with the brightness mode to output the selected blue gamma voltage set.