Common voltage compensation method and liquid crystal display device

Abstract

The invention provides a common voltage compensation method and a liquid crystal display device, and relates to the technical field of display, and the common voltage compensation method comprises the following steps: when the driving mode of a display picture is dot inversion, column 2-dot inversion or row 2-dot inversion, determining whether the display picture belongs to a first type of display pictures; when the display picture does not belong to the first type of display pictures, determining the number of first target sub-pixels and the number of second target sub-pixels in each row of sub-pixels; and when the number of the first target sub-pixels is not equal to the number of the second target sub-pixels, determining a corresponding common voltage compensation value according to the data voltages of the plurality of first target sub-pixels and the data voltages of the plurality of second target sub-pixels, and outputting the common voltage compensation value. Whether the number of the positive and negative polarity sub-pixels needs to be determined or not is judged by determining the driving mode and type of the display picture, and then the corresponding common voltage compensation value is determined through the data voltage of the positive and negative polarity sub-pixels and is compensated, so the compensated display picture can be normally displayed.

Description

Technical field [0001] The present application belongs to the field of display, and more particularly to a common voltage compensation method and a liquid crystal display device. Background technique [0002] LCD Crystal Display, LCDs have advantages such as low radiation, small size and low energy consumption, which are widely used in a variety of electronic devices such as laptops, televisions. [0003] Currently, the liquid crystal display panel is deflected by the electric field control liquid crystal molecules formed by the common electrode and the pixel electrode to achieve the purpose of displaying different grayscale pictures. [0004] However, when the liquid crystal display panel is displayed, since there is a coupling capacitor between the common electrode and the data line, when the data voltage on the data line occurs, the voltage across the coupling capacitor will also cause a mutation, resulting in a common voltage of the common electrode. Because the capacitive co...

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Problems solved by technology

[0004] However, when the liquid crystal display panel is displaying images, due to the coupling capacitance between the common electrode and the data line, when the data voltage on the data line changes suddenly, the voltage across the coupling capacitor will also change suddenly, resulting in the common voltage of the common electrode Because the capacitive coupling effect fluctuates accordingly, it is difficult to maintain stability, and then the voltage difference between the common electrode and the pixel electrode is abnormal, which will cause a deviation between the deflection direction of the liquid crystal molecules and the preset direction, causing the display screen to flicker ( flicker), greenish (greenish), crosstalk (crosstalk) and other defects, which reduce the display effect and product yield

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