Pixel circuit of LCD device in vertical orientation mode

Abstract

The invention discloses a pixel circuit of a liquid crystal display device in a vertical oriented mode, comprising grid lines which are crossly arranged, a data line, a film transistor, a liquid crystal capacitor and a memory capacitor; the liquid crystal capacitor and the memory capacitor are connected with the data line by the film transistor; the pixel circuit also comprises an additional capacitor used for sharing charges; the film transistor comprises a first film transistor, a second film transistor and a third film transistor; the grid electrode of the first film transistor and the third film transistor is electrically connected with the first grid line; the source electrode of the first film transistor is electrically connected with the data line; the grid electrode of the second film transistor is electrically connected with the second grid line; the liquid crystal capacitor is connected with the additional capacitor by the second film transistor; the electrode of the additional capacitor is electrically connected with the source electrode and the drain electrode of the third film transistor respectively; and the first grid line and the second grid line are respectively opened at different time points within the time of one frame so as to lead the liquid crystal capacitor to be arranged at different signal voltages at different time sections within the time of one frame.

Description

[0001] This application is a divisional application of: [0002] Title of Invention: Pixel Circuit of Vertical Alignment Mode Liquid Crystal Display Device [0003] Application date: November 6, 2007 [0004] Application number: 200710047855.X technical field [0005] The invention relates to a pixel circuit, in particular to a pixel circuit of a vertical alignment mode thin film transistor liquid crystal display device. Background technique [0006] The liquid crystal in the liquid crystal display device does not emit light itself, and the liquid crystal display controls the light transmittance of the liquid crystal unit by controlling the twisting of the liquid crystal molecules by an electric field, so as to achieve the purpose of display. Normally, in a TFT-LCD (Thin Film Transistor Liquid Crystal Display), liquid crystal is sealed between the upper and lower substrates. In a vertical alignment mode TFT-LCD, liquid crystal molecules are generally composed of a liquid ...

AI Technical Summary

Problems solved by technology

However, these improved solutions make the pixels more complicated, the pixel aperture ratio decreases, and also introduce new problems, including the discharge TFT offsetting the voltage division effect of the additional capacitor, and the writing level value of the liquid crystal pixel is affected by the value written in the previous frame. influence etc.

In addition, the pixel design determines the division of different regions in the pixel. The ratio between regions is a fixed value that cannot be flexibly changed, and the adjustment of the gamma characteristic is not flexible enough.

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