Liquid crystal display device and its driving method

Abstract

In a liquid crystal display device, a first skipping scanning process is performed by activating the scanning signals G(1), G(3) and G(5) corresponding to the odd-numbered rows in a pixel matrix made of numerous pixel formation portions in that order in a first half-period of a given frame, and voltages corresponding to the pixel values to be written into the pixel formation portions of the odd-numbered rows of the pixel matrix are applied to the video signal lines as positive-polarity video signals. In a second half-period of that frame, a second skipping scanning process is performed by activating the scanning signals G(2), G(4) and G(6) corresponding to the even-numbered rows in the pixel matrix in that order, and voltages corresponding to the pixel values to be written into the pixel formation portions of the even-numbered rows of the pixel matrix are applied to the video signal lines as negative-polarity video signals. Thus, line inversion driving is accomplished.

Description

technical field [0001] The present invention relates to a liquid crystal display device and a driving method thereof, and more specifically relates to AC driving in an active matrix type liquid crystal display device. Background technique [0002] In order to suppress liquid crystal degradation and maintain display quality in liquid crystal display devices, AC drive is generally performed. However, in an active liquid crystal display device, since the characteristics of switching elements such as TFTs (thin film transistors) provided in each pixel are not perfect, even if the video signal from the video signal line (column electrode) of the liquid crystal panel is applied with a voltage The positive and negative of the video signal output by the line drive circuit (also called "column electrode drive circuit" or "data line drive circuit"), that is, the positive and negative of the applied voltage based on the potential of the common electrode is symmetrical, and the transmis...

AI Technical Summary

Problems solved by technology

However, when the line inversion driving method is used instead of the frame inversion driving method, the frequency of polarity inversion (inversion frequency) in the video signal that should be applied to the liquid crystal panel becomes higher, and in order to reduce the driving IC (integrated Circuit) necessary withstand voltage, the potential switching frequency of the common electrode also becomes higher, resulting in increased power consumption

In addition, flicker cannot be sufficiently suppressed only by the row inversion driving method.

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