Patent ID: 7839377

Claim:
A lamp driving apparatus of a liquid crystal display device, comprising: a plurality of lamps irradiating light to a liquid crystal display panel and including external electrodes; a common electrode connected to the external electrodes that supply a tube current to the lamps; auxiliary electrodes that are movable; an auxiliary electrode driving part sequentially connecting the auxiliary electrodes with and disconnecting the auxiliary electrode from the external electrodes in accordance with a scan direction of data to be displayed on the liquid crystal display panel; a scanning signal generating part that supplies a scanning signal to the auxiliary electrode driving part; and a timing controller that supplies a horizontal synchronization signal and a vertical synchronization signal to the scanning signal generator, wherein the auxiliary electrode driving part includes a comparator comparing a predetermined reference voltage with the scanning signal to selectively generate a piezoelectric drive positive voltage and a piezoelectric drive negative voltage in accordance with the comparison result and a piezoelectric movable element that contracts and expands in accordance with a piezoelectric drive positive voltage and a piezoelectric drive negative voltage from the comparator to drive the auxiliary electrode.