Patent ID: 8194018

Claim:
An active-matrix liquid crystal display device, comprising: a video signal line driver circuit for driving a plurality of video signal lines transmitting a plurality of video signals corresponding to image signals externally provided for displaying an image; a scanning signal line driver circuit for driving a plurality of scanning signal lines crossing the video signal lines; an auxiliary capacitance line driver circuit for driving a plurality of auxiliary capacitance lines arranged along their corresponding scanning signal lines; a plurality of pixel formation portions arranged in a matrix along the video signal lines and the scanning signal lines; and a common electrode driver circuit for driving a common electrode supplying a common potential to the pixel formation portions; wherein each of the pixel formation portions includes a pixel electrode connected to a corresponding one of the video signal lines, the pixel electrode having an auxiliary capacitance formed between the pixel electrode and its corresponding auxiliary capacitance line and also having a liquid crystal interposed between the pixel electrode and the common electrode, wherein the common electrode driver circuit alternatingly applies a first potential and a second potential, where the second potential is greater than the first potential, to the common electrode each time one of the scanning signal lines is selectively driven by the scanning signal line driver circuit or at each interval between more than one scanning signal line being driven by the scanning signal line driver circuit, and wherein the auxiliary capacitance line driver circuit drives the auxiliary capacitance lines by applying a third potential or a fourth potential greater than the third potential at or after a first time point subsequent to selection of a corresponding scanning signal line by the scanning signal line driver circuit, the corresponding scanning signal line transitioning at the first time point from a selected state to a deselected state, such that the applied potential is changed in a same direction as a direction in which the potential of the common electrode is changed at or immediately after the first time point, the applied potential being maintained for a period until a second time point subsequent to a next selection of the corresponding scanning signal line or until a time point before and close to the second time point, the corresponding scanning signal line transitioning at the second time point from the selected state to the deselected state.