Patent ID: 8102354
Filing Date: 2012-01-24
Classification: G09G

Abstract:
1. A data driver, comprising: a shift register that generates sampling signals using a shift clock and a start pulse; a latch that sequentially samples data signals, received from the outside, in response to the sampling signals; a gamma voltage generator that generates red, green, and blue positive gamma voltages and red, green, and blue negative gamma voltages and selectively outputs the red, green, and blue positive gamma voltages or the red, green, and blue negative gamma voltages according to a polarity control signal; and a digital to analog converter that converts the data signals received from the latch to positive analog video signals using the red, green, and blue positive gamma voltages from the gamma voltage generator if the gamma voltage generator applies the red, green, and blue positive gamma voltages or that converts the data signals received from the latch to negative analog video signals using the red, green, and blue negative gamma voltages from the gamma voltage generator if the gamma voltage generator applies the red, green, and blue negative gamma voltages, wherein the gamma voltage generator includes: wherein each of the red, green and blue gamma voltage generators includes: wherein the single decoder is directly connected with both the positive and negative gamma voltage generators and is directly connected with the single register set, wherein the single decoder is directly connected between an output terminal of the single register set and both input terminals of the positive and negative gamma voltage generators, wherein the single decoder applies the m reference gamma voltages, generated according to the adjustment signal, to the both the positive and negative gamma voltage generators, and wherein the polarity control signal is applied to all the three multiplexers of the red, green and blue gamma voltage generators.