Patent ID: 8184113

Claim:
A method for adjusting a common voltage of a liquid crystal display (LCD) device, the method comprising: step a: providing an LCD device and a photodetector; step b: obtaining variable parameters Ya, Yb and Yc using the photodetector, the variable parameters Ya, Yb and Yc respectively denoting flicker intensity of the LCD device when the common voltages are parameters Va, Vb and Vc, Vb exceeding Va, and less than Vc; step c: comparing Yb, Yc and Ya obtained by the step b, wherein when Yb exceeds Yc and is less than Ya, going to step d; when Yb exceeds Ya and is less than Yc, going to step e; when Yb is less than or equals Ya and is less than or equals Yc, going to step f; step d: increasing the parameters Va, Vb and Vc respectively, and going to the step b; step e: decreasing the parameters Va, Vb and Vc respectively, and going to the step b; and step f: setting an arbitrary value between Va and Vc as an optimum common voltage of the LCD device; wherein the variable parameters Ya, Yb and Yc are directly proportional to the flicker intensity of the LCD device.