Patent ID: 7764260

Claim:
A liquid crystal panel driving device for a liquid crystal display device comprising source lines, pixel switches, pixel electrodes connected to the source lines through the pixel switches, and an opposing electrode opposed to the pixel electrodes, the liquid crystal panel driving device applying to the pixel electrodes voltages corresponding to image data for pixels through the source lines, the liquid crystal panel driving device comprising: a charge-reusing means for reusing an electric charge of the source lines; a charge-reusing means-connecting means for connecting and disconnecting the source lines and the charge-reusing means; and a controlling means for controlling the charge-reusing means-connecting means such that the source lines are connected to the charge-reusing means after applying a first voltage to a previous set of the pixel electrodes but before applying a second voltage to a subsequent set of the pixel electrodes when the voltage difference between the first voltage and the second voltage is equal to or greater than a predetermined difference.