Patent ID: 8179347

Claim:
An apparatus for driving a liquid crystal display device, comprising: a signal processor receiving gamma-treated data from an input source, and performing a reverse gamma correction on the gamma-treated data to generate reverse-gamma-corrected data having a first linear characteristic, wherein first gamma values are used to treat the gamma-treated data; a separate look-up table for each color data storing reverse gamma correction values of each red-color data of the gamma-treated data, green-color data of the gamma-treated data and blue-color data of the gamma-treated data; a gamma means for performing a gamma correction of the reverse-gamma-corrected data using second gamma values to generate second gamma-corrected data; a timing controller receiving the synchronizing signal from the input source and the second gamma-corrected data from the gamma means, wherein the timing controller generates a data control signal and a gate control signal; a gamma voltage supplier supplying analog gamma voltages having a second reverse gamma characteristic complementary to a gamma characteristic of the gamma means; a data driver receiving the second gamma-corrected data from the timing controller and selecting one of the analog gamma voltages from the gamma voltage supplier in correspondence with gray levels of the gamma corrected data to generate analog data signals, wherein each portion of the generated data signal is a linear signal; and a liquid crystal display panel for receiving the analog data signals from the data driver; wherein the signal processor adjusts a gain of the reverse-gamma-corrected data having the first linear characteristic after performing the reverse gamma correction of the gamma-treated data using the reverse gamma correction values of each red-color data of the gamma-treated data, green-color data of the gamma-treated data and blue-color data of the gamma-treated data stored in the look-up table, and wherein the combination of the gamma characteristics of the gamma means and the second reverse gamma characteristics of the gamma voltage supplier has the second linear characteristic.