Patent ID: 7893909

Claim:
A TFT liquid crystal display panel driving device, comprising: a source driver for driving a TFT liquid crystal display panel, comprising a plurality of output buffers with chopper function; and a modulation signal generator, for providing a first modulation signal only to the output buffers at odd output ends in the source driver and providing a second modulation signal only to the output buffers at even output ends in the source driver; wherein the first and the second modulation signals are different signals in different states and the states of the first and the second modulation signals control polarities of offset voltages of the output buffers so that odd columns of a first frame and a second frame output by the source driver and even columns of a third frame and a fourth frame output by the source driver have a first polarity of offset voltage; even columns of the first frame and the second frame and odd columns of the third frame and the fourth frame have a second polarity of offset voltage, wherein the first and the second polarities have opposite signs.