Liquid crystal display screen, display device and method for adjusting common electrode voltage

Abstract

The invention discloses a liquid crystal display screen. The liquid crystal display screen is provided with second pixel units, a mean value voltage is obtained by neutralizing the positive voltages and negative voltages of the adjacent second pixel units, and is fed back to an operational amplifier to provide an actual common electrode voltage for the common electrode, the formula that the positive voltages minus the common electrode voltage equals to the common electrode voltage minus the negative voltages is met, and the phenomenon that the liquid crystal display screen flickers is avoided. Meanwhile, due to the fact that the liquid crystal display screen is divided into a plurality of areas capable of achieving respective control, that is, different common electrode voltages are provided for different areas, the whole screen is free of dead corners and does not flicker. The invention further discloses a display device and a method for regulating the voltage of the common electrode.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display screen, a display device and a common electrode voltage regulation method. Background technique [0002] In recent years, liquid crystal displays (Liquid Crystal Displays, LCDs) have gradually spread in people's lives. A liquid crystal display panel, which is an important part of a liquid crystal display, mainly includes an array substrate, a color filter substrate, and liquid crystal molecules located between the array substrate and the color filter substrate. The liquid crystal display panel controls the orientation of liquid crystal molecules through an electric field to change the transmittance of the liquid crystal display panel, thereby realizing the display function. In the liquid crystal display panel, the electric field controlling the liquid crystal molecules is determined by the voltage difference between the pixel electrode and...

AI Technical Summary

Problems solved by technology

In the liquid crystal display panel, the electric field controlling the liquid crystal molecules is determined by the voltage difference between the pixel electrode and the common electrode, but due to the existence of parasitic capacitance, the voltage of the pixel electrode will jump when the gate signal is turned off. ΔV P The deviation (feed-through effect), in order to ensure the display quality of the liquid crystal display panel, the voltage deviation ΔV of the voltage of all pixel electrodes before and after the jump occurs P should be consistent

[0003] However, in the liquid crystal display panel, due to the delay of the resistance and capacitance, the gate signal transmitted on one gate line will be distorted along the transmission direction, so that the voltage of the pixel electrode will be transmitted along the gate signal on the gate line. Orientation is delayed

Generally, the voltage applied to the common electrode is the same, resulting in a voltage deviation ΔV on each pixel unit in the entire liquid crystal display panel. P Inconsistency, the LCD panel will cause problems such as screen flickering, which is more obvious in large-size LCDs

[0004] Nowadays, the commonly used solution is to adjust the common electrode voltage, that is, the VCOM voltage, to meet the positive voltage-VCOM=VCOM-negative voltage, so that the degree of flickering can be reduced to the minimum, but this increases the LCM (LCD Module, liquid crystal display module ) man-hours and difficulty of the job

In addition, because the charging effect of the middle area of ​​the screen is different from that of the two sides (that is to say, the charging effect of the pixel unit at the far end of the gate line is different from that of the pixel unit at the near end), the feed-through effect is also different, because There is only one VCOM voltage, and the method of ensuring the display effect of the middle area and sacrificing the display effect of the two sides is often adopted, so that the flicker in the middle area is low, but the flicker on both sides is still serious.

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