CN102201217B - Method for eliminating image residue and flicker of liquid crystal display - Google Patents
Method for eliminating image residue and flicker of liquid crystal display Download PDFInfo
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- CN102201217B CN102201217B CN 201110186122 CN201110186122A CN102201217B CN 102201217 B CN102201217 B CN 102201217B CN 201110186122 CN201110186122 CN 201110186122 CN 201110186122 A CN201110186122 A CN 201110186122A CN 102201217 B CN102201217 B CN 102201217B
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Abstract
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
The present invention relates to field of liquid crystal, in particular, relate to for eliminating image residue that the TFT-LCD screen occurs in videograph process and the method for film flicker.
Background technology
Along with scientific-technical progress; LCD display has obtained using more and more widely; people are also more and more higher for the requirement of the combination property of LCD display; usually can occur affecting residual and film flicker during lcd screen display frame in the use procedure; phenomenon can cause screen aging like this, has a strong impact on the serviceable life of LCD display.
At present, removing the ghost method mainly is the method for frame counter-rotating, line counter-rotating and some counter-rotating by the drive unit input voltage, if the voltage that namely inputs to pixel at the first frame is for just, then at next frame input negative value voltage, by that analogy, each pixel is like this, such voltage both positive and negative polarity checker, can prevent ghost, but can't solve the flicker problem, and affect image quality.
Summary of the invention
Technical matters to be solved by this invention is to realize a kind of clear method that can effectively remove liquid crystal device ghost and flicker and can guarantee picture.
To achieve these goals, the technical solution used in the present invention is: a kind of method of eliminating liquid crystal display ghost and flicker, the common electric voltage of the method adjustable liquid crystal display display screen is to the intermediate value in video voltage value interval, the video voltage that drive unit exports on each pixel alternately changes around the common electric voltage value, and described alternately the variation refers to that the video voltage mean value of exporting equals the common electric voltage value in two continuous two field pictures.
In each two field picture, in the video voltage of odd-numbered line/row and even row/column one group greater than the common electric voltage value, another organize less than the common electric voltage value, and when the next frame signal is inputted, the video voltage of parity rows/row and the exchange of common electric voltage value magnitude relationship.
In each two field picture, one of the video voltage of adjacent pixel is greater than the common electric voltage value, and another is less than the common electric voltage value.
The device of adjustable liquid crystal display display screen common electric voltage comprises power module and potentiometer, and described power module input end connects power supply, and its output terminal is that liquid crystal display is carried common electric voltage through potentiometer.
Described power module is the L6932D1.2 module, and described potentiometer is the 20K potentiometer, and an end ground connection of its potentiometer is played divider resistance.
The power supply of described power module obtains at drive unit.
The invention has the advantages that the method has eliminated that liquid crystal display is aging, the problem of image residue and flicker, can make the demonstration of TFT-LCD fix on black and white lattice field after one to two hours, afterimage and film flicker do not appear when switching to other signal fields again, and the method can be expanded the environment temperature of liquid crystal cell work, make it work in-55 ℃-60 ℃ environment, and do not affect the reliability of liquid crystal cell, normal display in any environment, and can image to the liquid crystal deflecting element scope.
Description of drawings
The below is briefly described the content of every width of cloth accompanying drawing expression in the instructions of the present invention and the mark among the figure:
Fig. 1 is frame counter-rotating schematic diagram;
Fig. 2 is line counter-rotating schematic diagram;
Fig. 3 is some counter-rotating schematic diagram;
Fig. 4 is for using light sensor to measure the oscillogram of the flicker of screen;
Fig. 5 is common electric voltage regulating circuit schematic diagram.
Embodiment
The structure of lcd screen is symmetrical, generating positive and negative voltage can be used for the adjustment liquid crystal, utilize this characteristic, the common electric voltage that we will input liquid crystal is adjusted to the intermediate value in video voltage interval, such as video voltage in the 0-10V scope, we then are adjusted to 5V with common electric voltage, video voltage is swung up and down at this common electric voltage (VCOM), thereby produce at each pixel and to be similar to alternately " clean zero effect " of change of both positive and negative polarity, this clean zero effect that occurs on the liquid crystal has been eliminated aging and image residue problem, this technology will be made coordination in sharpness, because vision signal walking 5V-10V replaces 0-10V.
Referring to Fig. 1 as can be known, to obtain clean zero effect at liquid crystal display, can use reversing mode at whole LCD picture, the frame counter-rotating is that the video voltage on each pixel is alternately changed around the common electric voltage value, this video voltage mean value of exporting in two continuous two field pictures that says that has more that alternately changes equals the common electric voltage value, video voltage fluctuates up and down around the common electric voltage value, produces clean zero effect, removes ghost and flicker.
Referring to Fig. 2 as can be known, line counter-rotating also in the two continuous frames image video voltage fluctuate up and down around the common electric voltage value, different is in each two field picture, in the video voltage of odd-numbered line/row and even row/column one group greater than the common electric voltage value, another group is less than the common electric voltage value, and when the next frame signal was inputted, the video voltage of parity rows/row and common electric voltage value magnitude relationship were exchanged.Referring to Fig. 3 as can be known, the point counter-rotating also is that video voltage fluctuates up and down around the common electric voltage value in the two continuous frames image, different is in each two field picture, one of the video voltage of adjacent pixel is greater than the common electric voltage value, another is less than the common electric voltage value, its position relationship is as the chessboard of Western Chinese chess, and when the next frame picture the fluctuating up and down around the common electric voltage value with respect to the previous frame video voltage of each pixel, produce clean zero effect.
All can produce clean zero effect with respect to the time according to above-mentioned three kinds of inverting methods, rotary-die type can be selected according to fabricator's needs, and it is embedded in the driving circuit.
Vcom voltage need accurately be placed on just can avoid flicker on the vision signal mid point.When illustrating why display screen can glimmer, suppose because make the relation of screen.Vcom fixes on 5.5V.If vision signal swings between 0V and 10V, full scale voltage will be in each figure field difference to some extent, full scale voltage is 4.5V on a figure field, and is 5.5V at the full scale voltage of another figure field, can to be converted into luminosity poor for this difference in full scale voltage, so flicker occurs.Therefore as seen, for fear of flicker, need adjustment Vcom voltage to the intermediate value in video voltage interval.Referring to Fig. 4 as can be known, be used for adjustable liquid crystal display display screen common electric voltage device its mainly comprise power module and potentiometer, the preferred L6932D1.2 module of power module wherein, potentiometer is the potentiometer of 20K, the input end of L6932D1.2 module (IN) connects the power supply of drive unit, from drive unit, obtain the 5V power supply, the L6932D1.2 module converts this 5V power supply to the 3.3V power supply and is exported by output terminal (OUT), its output terminal connects potentiometer, and potentiometer one end ground connection is played the dividing potential drop effect at circuit, behind the some screen, regulate this potentiometer resistance, so that VCOM voltage is 2.5V, this moment, ghost and scintillation disappeared.Potentiometer is regulated and is carried out according to the mode of integrading theory with practice.
Fig. 5 demonstrates the picture light intensity difference under the being and not being flicker, and the A waveform has larger DC level, records to get not flicker of picture, this time measures and uses the EL7900 light sensor.Light sensor changes light intensity into electric current, and electric current is larger, and the voltage deflection that produces at oscillograph is also larger.
This patent is applicable to the national defense and military apparatus field display that uses of working under cryogenic conditions, comprise aircraft, warship, tank, flying apsaras equipment.
Claims (2)
1. method of eliminating liquid crystal display ghost and flicker, it is characterized in that: the common electric voltage of the method adjustable liquid crystal display display screen is to the intermediate value in video voltage value interval, the video voltage that drive unit exports on each pixel alternately changes around the common electric voltage value, and described alternately the variation refers to that the video voltage mean value of exporting equals the common electric voltage value in two continuous two field pictures;
In each two field picture, in the video voltage of odd-numbered line/row and even row/column one group greater than the common electric voltage value, another organize less than the common electric voltage value, and when the next frame signal is inputted, the video voltage of parity rows/row and the exchange of common electric voltage value magnitude relationship.
2. the method for elimination liquid crystal display ghost according to claim 1 and flicker is characterized in that: in each two field picture, one of the video voltage of adjacent pixel is greater than the common electric voltage value, and another is less than the common electric voltage value.
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| CN 201110186122 CN102201217B (en) | 2011-07-05 | 2011-07-05 | Method for eliminating image residue and flicker of liquid crystal display |
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| CN 201110186122 CN102201217B (en) | 2011-07-05 | 2011-07-05 | Method for eliminating image residue and flicker of liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104361874B (en) | 2014-11-20 | 2017-02-22 | 京东方科技集团股份有限公司 | Temperature compensating circuit and method and liquid crystal display |
| CN106454326A (en) * | 2016-10-13 | 2017-02-22 | 张家港康得新光电材料有限公司 | Crosstalk value test device |
| CN106847212A (en) | 2017-02-23 | 2017-06-13 | 北京京东方专用显示科技有限公司 | Common electric voltage controls circuit and method, display panel and display device |
| CN110516607B (en) * | 2019-08-28 | 2022-08-05 | 京东方科技集团股份有限公司 | Fingerprint identification structure, fingerprint identification display device and driving method |
| CN111726477A (en) * | 2020-06-30 | 2020-09-29 | 中航华东光电有限公司 | IPS screen ghost eliminating method in special application environment |
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| CN1530723A (en) * | 2003-03-14 | 2004-09-22 | ���µ�����ҵ��ʽ���� | Displaying device and driving method thereof |
| CN1825415A (en) * | 2005-02-23 | 2006-08-30 | 三星Sdi株式会社 | Liquid crystal display device performing dot inversion and method of driving the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1530723A (en) * | 2003-03-14 | 2004-09-22 | ���µ�����ҵ��ʽ���� | Displaying device and driving method thereof |
| CN1825415A (en) * | 2005-02-23 | 2006-08-30 | 三星Sdi株式会社 | Liquid crystal display device performing dot inversion and method of driving the same |
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