Patent ID: 8077132

Claim:
A flat display device, characterized by comprising: a pixel display part in which a pixel is disposed at each intersection between multiple rows of scanning lines and multiple columns of signal lines; a driver circuit which provides a video signal through a video signal line; an analog switch circuit that connects a signal line selected from N signal lines (N is an integer equal to or greater than 2) to the video signal line for each of groups in which each of the video signal lines from the driver circuit corresponds to N signal lines; and a control circuit which controls to drive the scanning lines and controls the driver circuit and the analog switch circuit, wherein the control circuit further controls to drive a signal line while providing a periodicity of every M scanning lines (M is an even number) of a voltage polarity of signal lines in each frame, and performs a preliminary drive of signal lines prior to providing a video signal to the signal line selected by the analog switch circuit corresponding to the first scanning line at the beginning of a frame, and the preliminary drive provides a polarity signal from the driver circuit to the video signal line and connects the signal line selected by the analog switch circuit to the video signal line sequentially to provide a voltage polarity of a final scanning line with the periodicity of every M lines in a condition that a drive of the scanning lines is stopped, and the voltage polarity of the polarity signal of the preliminary drive is set the same as the voltage polarity of the polarity signal of the final scanning line with the periodicity of every M lines.