Device and a method for driving liquid crystal display

摘要

The present invention relates to device for driving liquid crystal display (LCD) and method for driving the same. The device for driving LCD comprises a voltage input module for receiving Gamma reference voltage; a voltage generation module connected to said voltage input module, for generating pixel driving voltage of a corresponding color with one resistor-chain, according to the Gamma reference voltage and the color of pixel being driven; and a voltage output module connected to said voltage generation module, for transmitting the pixel driving voltage of said corresponding color to a liquid crystal panel. According to an embodiment of the present invention, voltage generation units that respectively generate pixel driving voltage of three colors are set on one resistor-chain, and a corresponding voltage generation unit is selected by a multi-selector according to the color of pixel being driven, so that the corresponding voltage generation unit transmits the pixel driving voltage to the voltage output module. According to an embodiment of the present invention, color shifting phenomenon is effectively overcome, thus improving TFT-LCD's picture quality.

主权项

1. A device for driving liquid crystal display, comprising:
a voltage input module for receiving a plurality of gamma reference voltages to be used for all three color components; a voltage generation module connected to said voltage input module, for generating pixel driving voltage of a corresponding color with one resistor-chain to which the plurality of gamma reference voltages are applied for all three color components, according to the gamma reference voltage and the color of pixel being driven; and a voltage output module connected to said voltage generation module, for transmitting the pixel driving voltage of said corresponding color to a liquid crystal panel; wherein a plurality of voltage generation units that respectively generate pixel driving voltages for each of three colors are set on said one resistor-chain, and a corresponding voltage generation unit is selected by a multi-selector according to the color of pixel being driven; said one resistor-chain comprises a plurality of input terminals and a plurality of output terminals, wherein the plurality of input terminals receives the plurality of gamma reference voltages to be used simultaneously for red, green, and blue color components, the plurality of output terminals are divided into a plurality of groups; each group comprises three output terminals for outputting a pixel driving voltage for red color, a pixel driving voltage for green color and a pixel driving voltage from blue color respectively at a same time, and each group corresponds to each of different gray levels respectively.