A data driving circuit, a liquid crystal display device and a driving method

Abstract

A data driving circuit, a liquid crystal display device, and a driving method. The data driving circuit comprises: a source driving module, a pixel electrode, a common electrode opposite to the pixel electrode, and a gamma correction module which is coupled with the source driving module. The source driving module is coupled with the pixel electrode. The data driving circuit also comprises a compensation module. The compensation module detects and obtains variation of the voltage of the common electrode to produce a compensation voltage, superposes the compensation voltage and gamma voltage of the gamma correction module, and sends the superposed compensation voltage and gamma voltage to the source driving module. The compensation voltage output by the compensation module can compensate the variation of the voltage of the common electrode.

Description

technical field [0001] The invention relates to the field of liquid crystal display, more specifically, to a data drive circuit, a liquid crystal display device and a driving method. Background technique [0002] The liquid crystal display device includes a liquid crystal panel and a backlight module that provides a light source for the liquid crystal panel. The liquid crystal panel includes a plurality of pixel electrodes and a common electrode opposite to the pixel electrodes; a pixel capacitor is formed between the pixel electrode and the common electrode, and the pixel capacitor The pixel electrode is connected to the drain of the thin film transistor (TFT), and the liquid crystal molecules are located between the two electrodes of the pixel capacitor. The liquid crystal panel outputs different voltages to the drain of the TFT, so that the liquid crystal molecules have different deflection angles, and the corresponding luminous fluxes are also different, so that the disp...

AI Technical Summary

Problems solved by technology

Because there is a certain resistance in the line, there is a parasitic capacitance between the data line and the common electrode. When the voltage of the data line changes, it will affect the potential of the common electrode. If the resistance of the common electrode is too large, the potential of the common electrode cannot return to within a short time. Set the potential, that is, the common electrode voltage is no longer a stable fixed value, but there will be a change around the fixed value, which is likely to generate crosstalk noise (crosstalk), resulting in a decrease in picture quality

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