Method for eliminating image residue and flicker of liquid crystal display
A liquid crystal screen, liquid crystal display technology, applied in the direction of instruments, static indicators, etc., can solve the problems of screen aging, unable to solve the problem of flickering, residual screen flickering, etc., and achieve the effect of eliminating aging
Active Publication Date: 2013-05-01
中航华东光电有限公司
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[0002] With the advancement of science and technology, LCD displays have been used more and more widely, and people have higher and higher requirements for the comprehensive performance of LCD displays. During the use of LCD screens, there are often residual effects and screen flickering when displaying images. This phenomenon will lead to aging of the screen and seriously affect the service life of the LCD display
[0003] At present, the method of removing residual image is mainly through frame inversion, line inversion and point inversion of the input voltage of the driving device, that is, if the voltage input to the pixel point is positive in the first frame, then a negative value is input in the next frame Voltage, and so on, each pixel is like this, such voltage positive and negative alternately can prevent afterimages, but it cannot solve the problem of flickering, and it will affect the picture quality
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[0018] The structure of the LCD screen is symmetrical, and both positive and negative voltages can be used to adjust the liquid crystal. Using this feature, we adjust the common voltage input to the liquid crystal to the middle value of the video signal voltage range. For example, the video signal voltage is between 0- In the 10V range, we adjust the common voltage to 5V, so that the video signal voltage swings up and down on this common voltage (VCOM), thereby creating a "net zero effect" similar to the alternating positive and negative poles on each pixel, This net-zero effect that occurs on the liquid crystal eliminates burn-in and image retention problems. This technology needs to be coordinated in clarity, because the video signal travels 5V-10V instead of 0-10V.
[0019] see figure 1 It can be seen that to obtain a net-zero effect on the LCD screen, the inversion mode can be used on the entire LCD screen. The frame inversion is driven by the driving device to make the vi...
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The invention discloses a method for eliminating image residue and flicker of a liquid crystal display, which is to adjust the common voltage of the liquid crystal display screen to the mediate value of a voltage value interval of a video signal; and video signal voltages output to respective pixels by a driving device change alternatively around the common voltage value, wherein the alternative change refers to that the average value of the video signal voltages output in a continuous two-frame image is equal to the common voltage value. The method eliminates the problems of aging, image residue and flicker of a liquid crystal display, can avoid image residue and flicker after fixing the displaying of a thin film transistor (TFT)-LCD to a black-white lattice field for one to two hours and then switching to other signal fields, expands the temperature range of the working environment of a liquid crystal box and makes the liquid crystal box work in the environment of 55 below zero DEG C to 60 DEG C without influence on the reliability of the liquid crystal box; and the signals can be displayed normally in any environment without influence on the deflection ranges of liquid crystal molecules.
Description
technical field [0001] The invention relates to the field of liquid crystal displays, and more specifically relates to a method for eliminating image sticking and picture flickering in the developing process of a TFT-LCD screen. Background technique [0002] With the advancement of science and technology, LCD displays have been used more and more widely, and people have higher and higher requirements for the comprehensive performance of LCD displays. During the use of LCD screens, there are often residual effects and screen flickering when displaying images. This phenomenon will cause the aging of the screen and seriously affect the service life of the LCD display. [0003] At present, the method of removing residual image is mainly through frame inversion, line inversion and point inversion of the input voltage of the driving device, that is, if the voltage input to the pixel point is positive in the first frame, then a negative value is input in the next frame Voltage, an...
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IPC IPC(8): G09G3/36
Inventor 夏云奇陈文明
Owner 中航华东光电有限公司