Patent ID: 7633592

Claim:
A liquid crystal display device comprising: a plurality of scan lines disposed on a substrate; a plurality of data lines disposed on the substrate and intersecting the scan lines; a plurality of pixel switching devices disposed on the substrate and corresponding to intersections of the data lines and the scan lines; a plurality of pixel electrodes disposed on the substrate, each of the pixel electrodes being connected with a corresponding pixel switching device; a common electrode disposed over the pixel electrodes; a common power supply circuit connected with the common electrode and outputting a square wave signal alternating between a higher electric potential and a lower electric potential at a common electric potential inversion timing; and a first reference electric potential power supply circuit that outputs a first reference electric potential to the scan lines in a manner that at every common electric potential inversion timing the scan lines receive the first reference electric potential, wherein an impedance between the common power supply circuit and the common electrode is approximately the same as an impedance between the first reference electric potential power supply circuit and the scan lines.