Patent ID: 8059075
Filing Date: 2011-11-15
Classification: G09G,H02M

Abstract:
1. A liquid crystal display device comprising: a switching device; a pixel electrode to which a video signal is applied through the switching device; a common electrode to which a common electrode signal is applied, the common electrode signal alternating between a high level and a low level; a liquid crystal that is aligned by an electric field between the pixel electrode and the common electrode; and a power supply circuit that generates a power supply electric potential to control turning on and off of the switching device, the power supply circuit comprising first and second charge transfer devices that complementarily turn on and off to each other in response to the common electrode signal and a first capacitor having one terminal connected with a connecting node between the first and second charge transfer devices and another terminal to which the common electrode signal is applied; wherein the power supply circuit further comprises third and fourth charge transfer devices that complementarily turn on and off to each other in response to the common electrode signal and a second capacitor having one terminal connected with a connecting node between the third and fourth charge transfer devices and another terminal to which an inverted signal of the common electrode signal is applied.