Patent ID: 8711137
Filing Date: 2014-04-29
Classification: G09G

Abstract:
1. A liquid crystal display device comprising: a gamma voltage generator; a common voltage circuit; a clock controller detecting an external clock signal and outputting a switching signal based on the detection result of the external clock signal; a power converter coupled to said clock controller and providing a first working voltage for said clock controller; a shutoff switching circuit coupled to said clock controller, receiving a second working voltage from said power converter, receiving said switching signal, and outputting one of a first control voltage and a second control voltage to the gamma voltage generator and the common voltage circuit according to information carried by said switching signal, to control a reference voltage output by the gamma voltage generator and a common voltage output by the common voltage circuit, making a pixel electrode and a common electrode of a pixel has a zero voltage difference when the clock controller does not detect said external clock signal or when the clock controller detects said external clock signal is abnormal; and said shutoff switching circuit not controlling said power converter.