Gamma voltage controller, gradation voltage generator, and display device including them

摘要

The present invention relates to a gamma voltage controller, a gradation voltage generator, and a display device including them. The gamma voltage controller corrects luminance in high and low gradations according to a color mode of a display panel, and generates a plurality of gradation voltages through inflection point adjustment, thus minimizing gradation mismatch between color modes.

主权项

1. A gamma voltage controller, comprising:
a gamma divider generating a plurality of voltages through voltage division between a first gradation voltage and an Nth gradation voltage; a gamma selection unit including first through Mth gamma selectors which select first through Mth gamma voltages from among the plurality of voltages, and outputting the selected first through Mth gamma voltages; a gamma buffering unit buffering the selected first through Mth gamma voltages, and outputting first through Mth 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 Mth gamma buffer voltage or the Nth gradation voltage, and by generating second through (N−1)th gradation voltages.