APPARATUS FOR PRODUCING GAMMA VOLTAGE, ORGANIC LIGHT EMITTING DEVICE INCLUDING THE SAME AND METHOD FOR PRODUCING GAMMA VOLTAGE

摘要

Disclosed are a gamma voltage generation apparatus, an organic light emitting display device including the same, and a method for generating a gamma voltage. A gamma voltage generation apparatus for providing a gamma voltage based on a gamma characteristic of a display panel according to an embodiment of the present invention comprises: a gamma reference voltage selection unit which receives a gamma reference voltage, and selects and outputs first, second, and third gamma voltages having voltage values equal to or lower than the gamma reference voltage; an intermediate gamma voltage selection unit which receives the first to third gamma voltages, and selects and outputs a plurality of intermediate gamma voltages; and an intermediate gamma voltage calculation unit which receives a plurality of high gamma voltages corresponding to a high gray level from the intermediate gamma voltage selection unit, selects a part of the high gamma voltages and calculates a low gamma voltage corresponding to a low gray level, and outputs a selection signal corresponding to the calculated low gamma voltage to the intermediate gamma voltage selection unit.