Method and device for eliminating residual image

Abstract

The invention relates to a method and a device for eliminating a residual image. The method comprises the following steps of: providing a gray level reference voltage or a common electrode voltage with the cyclical change in predetermined amplitude for a liquid crystal display through a voltage-supply circuit. The invention also relates to a device for eliminating the residual image. The device comprises a voltage-supply circuit used for supplying the gray level reference voltage or the common electrode voltage with the cyclical change in the predetermined amplitude to a thin film transistor liquid crystal display. The method and the device for eliminating the residual image can decrease or eliminate the asymmetry which occurs in a positive and negative display region relative to the common electrode voltage and is caused by the deviation between the ideal value and the actual value of the common electrode voltage, thereby decreasing or eliminating the direct-current component loaded on a pixel electrode for a long time, and reducing the degree of the residual image of the thin film transistor liquid crystal display.

Description

technical field [0001] The invention relates to a method and a device for eliminating an afterimage, in particular to a method and a device for eliminating an afterimage of a thin film transistor liquid crystal display. Background technique [0002] Among flat-panel displays, liquid crystal displays (LCDs) are widely used in mobile phones, computers, televisions, and personal digital assistants (PDAs) due to their thinness, light weight, low power consumption, and low electromagnetic emission. PDA) and other information devices. [0003] Afterimage is one of the obvious defects of today's LCD. The so-called afterimage means that the LCD displays the same fixed picture for a long time. When the picture is switched to the next picture, the image of the previous picture will be vaguely left. The ions in the panel will move to the upper and lower substrates of the liquid crystal along the direction of the electric field, and gather on the alignment layer. The gathered ions will...

AI Technical Summary

Problems solved by technology

[0006]The current design of TFT-LCD is to compensate the asymmetry of the positive and negative display areas caused by the DC voltage ΔVp by adjusting the common electrode voltage, but such adjustment is in TFT-LCD is carried out before leaving the factory, generally only once

Then when the TFT-LCD is used on the client side, due to the long-term display of a fixed screen or in a high-temperature and high-humidity environment, the DC voltage ΔVp on the panel will change, so that there is a deviation between the actually adjusted VCOM value and the ideal VCOM of the panel. Then, under the condition that the gray level reference voltage remains unchanged, the positive and negative display areas are asymmetrical with respect to the VCOM voltage, resulting in residual images and flickering that cause display quality degradation

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