Patent ID: 8362989

Claim:
A liquid crystal display device, comprising: a plurality of pixel electrodes; a common electrode; a data driving circuit configured for providing data voltages to each pixel electrode; and a common voltage generating circuit configured for providing a common voltage to the common electrode; wherein the common voltage generating circuit comprises a hysteresis comparator circuit and a direct current voltage adjusting circuit, the hysteresis comparator circuit is configured for providing an alternating current voltage, the direct current voltage adjusting circuit is configured for providing a direct current voltage with periodic change, the direct current voltage is configured for superimposing on the alternating current voltage to form a common voltage, and an absolute value of the common voltage changes only slightly within a predetermined range from each frame to the next adjacent frame; and wherein the direct current voltage is an impulse voltage with a reference voltage, a fluctuation amplitude of the impulse voltage being less than the reference voltage.