Patent ID: 8305319

Claim:
A liquid crystal display (LCD) device, comprising: an LCD panel; and a common voltage generating circuit that provides common voltages to the LCD panel, the common voltage generating circuit comprising: a timer configured for recording a current continuous operated time of the LCD panel; a voltage adjustment circuit configured for modifying the common voltages of the LCD panel; a look up table configured for storing a plurality of preset voltage values, wherein each of the preset voltage values is corresponded to one of a plurality of preset continuous operated times; and a microprocessor being electrically connected to the timer, the look up table, and the voltage adjustment circuit; wherein the microprocessor is configured for periodically reading one of the preset voltage values which is corresponded to the preset continuous operated time matching the current continuous operated time, and controlling the voltage adjustment circuit to modify the common voltage outputted to the LCD panel according to the preset voltage value corresponded to the preset continuous operated time matching the current continuous operated time.