Patent ID: 8610702

Claim:
A gamma voltage controller, comprising: a gamma distribution unit configured to generate a plurality of voltages by performing voltage divisions between a first gradation voltage and a N(th) gradation voltage, N being a positive integer greater than 2; a gamma selection unit having first through M(th) gamma selectors, the first through M(th) gamma selectors respectively selecting first through M(th) gamma voltages among the plurality of voltages to define a gamma curve, M being a positive integer smaller than N; a gamma buffer unit configured to adjust inflection points of the gamma curve, and configured to buffer the first through M(th) gamma voltages to output buffered first through M(th) gamma voltages; and a gradation distribution unit configured to generate second through N−1(th) gradation voltages by performing voltage divisions among the buffered first through M(th) gamma voltages; wherein the gamma buffer unit comprises: first through n(th) gamma non-adjustment buffers configured to buffer n gamma voltages outputted from the first through M(th) gamma selectors to output n buffered gamma voltages to the gradation distribution unit, n being a positive integer smaller than M; and first through m(th) inflection point adjustment buffers configured to buffer m gamma voltages outputted from the first through M(th) gamma selectors and to output m buffered gamma voltages to selectable voltage division contact points of the gradation distribution unit to adjust inflection points of the gamma curve m being a positive integer equal to M−n; wherein each of the first through m(th) inflection point adjustment buffers further comprises: a first amplifier and second amplifiers; the second amplifiers configured to amplify the difference outputted from the first amplifier, the second amplifiers being respectively coupled to different points on the gradation distribution unit; and an inflection point adjustment switch unit configured to couple the first amplifier to one of the second amplifiers.