CN102654991B - Method for reducing afterimage of liquid crystal display and liquid crystal display using the same - Google Patents
Method for reducing afterimage of liquid crystal display and liquid crystal display using the same Download PDFInfo
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- CN102654991B CN102654991B CN201210156388.5A CN201210156388A CN102654991B CN 102654991 B CN102654991 B CN 102654991B CN 201210156388 A CN201210156388 A CN 201210156388A CN 102654991 B CN102654991 B CN 102654991B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 145
- 238000000034 method Methods 0.000 title claims abstract description 21
- 206010047571 Visual impairment Diseases 0.000 title abstract 2
- 101150046160 POL1 gene Proteins 0.000 description 6
- 101100117436 Thermus aquaticus polA gene Proteins 0.000 description 6
- 101100224481 Dictyostelium discoideum pole gene Proteins 0.000 description 3
- 101150110488 POL2 gene Proteins 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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Abstract
A method for reducing the afterimage of a liquid crystal display and a liquid crystal display using the same are provided. The method comprises the following steps: switching the driving sequence of the liquid crystal polarity of the liquid crystal display within a preset time interval; and reducing the brightness of a backlight module of the liquid crystal display within the time of the first frame after the liquid crystal display switches the driving sequence of the liquid crystal polarity.
Description
Technical field
The invention relates to the technology of liquid crystal display, and relate to especially and a kind ofly reduce the method for the ghost of liquid crystal display and a kind of liquid crystal display adopting the method.
Background technology
Known liquid crystal display (Liquid Crystal Display, LCD), when display frame, is the liquid crystal driving same pixel in display panel with fixing liquid crystal polarity driven order.But, such mode will make liquid crystal display under showing for a long time, the liquid crystal of same pixel can continue to be applied in a direct current (DC) bias (DC bias), thus make picture occur the phenomenon of branding, namely occur so-called ghost (Image Sticking).Thus, just have impact on the quality of picture widely.
Summary of the invention
The invention provides a kind of method reducing the ghost of liquid crystal display.
The present invention separately provides a kind of liquid crystal display adopting said method.
The present invention proposes a kind of method reducing the ghost of liquid crystal display, and the method includes the following step: in a Preset Time, makes the driving order of liquid crystal display switchable liquid crystal polarity; And in the time of first frame after the driving order of liquid crystal display switchable liquid crystal polarity, reduce the brightness of a backlight module of liquid crystal display.
The present invention also proposes a kind of liquid crystal display, and this liquid crystal display includes a display panel, one scan driver, a data driver, time schedule controller and a control circuit.Described scanner driver and data driver are all electrically connected display panel.Described time schedule controller is electrically connected scanner driver and data driver, and in order to gated sweep driver scanning display panel, and control data driver drives display panel is to show.And described control circuit is electrically connected data driver, time schedule controller and a backlight module.In a Preset Time, control circuit just control data driver switches the driving order of the liquid crystal polarity of display panel, and data driver switch display panel liquid crystal polarity driving order after first frame time in, control backlight module reduce its brightness.
In sum, the present invention is when liquid crystal display display frame, in a Preset Time, just make the driving order of liquid crystal display switchable liquid crystal polarity, and in the time of first frame after the driving order of liquid crystal display switchable liquid crystal polarity, reduce the brightness of a backlight module of liquid crystal display.Therefore, the liquid crystal of same pixel would not continue to be applied in a direct current (DC) bias, makes display frame not easily occur the phenomenon of branding again.In other words, the liquid crystal display of the method is adopted not easily will to occur ghost.And in time due to first frame of the present invention after the driving order of liquid crystal display switchable liquid crystal polarity, the brightness of a backlight module reducing liquid crystal display can be gone, thus can maintain the consistance of picture brightness.Thus, the quality of picture is just significantly improved.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below.
Accompanying drawing explanation
Fig. 1 is the liquid crystal display according to one embodiment of the invention.
Fig. 2 is wherein a kind of embodiment that switchable liquid crystal polarity driven of the present invention order is described.
Fig. 3 illustrates the liquid crystal display according to another embodiment of the present invention.
Fig. 4 is the process flow diagram of the method for the ghost of minimizing liquid crystal display according to one embodiment of the invention.
[main element label declaration]
100: liquid crystal display 110: display panel
112: pixel 120: scanner driver
130: data driver 140: time schedule controller
150: control circuit 160: backlight module
170: test module 172: circuit system
174: backlight module BL_Duty1: the first work period control signal
BL_Duty2: the second work period control signal DS1, DS2: data-signal
POL1: the first liquid crystal polarity upset signal POL2: the second liquid crystal polarity upset signal
S402, S404: step Ydio: initial sweep signal
Embodiment
Fig. 1 is the liquid crystal display according to one embodiment of the invention.Please refer to Fig. 1, this liquid crystal display 100 includes display panel 110, scanner driver 120, data driver 130, time schedule controller 140, control circuit 150 and backlight module 160.Display panel 110 has multiple pixel 112, and each pixel 112 all has a layer of liquid crystal molecule.In addition, display panel 110 adopts direct current common potential.Scanner driver 120 and data driver 130 are all electrically connected display panel 110.And time schedule controller 140 is electrically connected scanner driver 120 and data driver 130, scan display panel 110 in order to gated sweep driver 120, and control data driver 130 drives display panel 110 to show.
As for control circuit 150, it is electrically connected data driver 130, time schedule controller 140 and backlight module 160, and in a Preset Time, control circuit 150 just control data driver 130 switches the driving order of the liquid crystal polarity of display panel 110, with Fig. 2, it is described.
Fig. 2 is wherein a kind of embodiment that switchable liquid crystal polarity driven of the present invention order is described.Switching mode shown in this figure is for the liquid crystal polarity of a certain pixel 112 in display panel 110 under different frame (frame).As shown in Figure 2, during the 1st frame to N number of frame, control circuit 150 carrys out with first negative just afterwards liquid crystal polarity driven order the liquid crystal that control data driver 130 drives this pixel 112.Then, during N+1 frame to M frame, control circuit 150 carrys out first to bear rear positive liquid crystal polarity driven order the liquid crystal that control data driver 130 drives this pixel 112.Then, during M+1 frame to K frame, control circuit 150 carrys out with first negative just afterwards liquid crystal polarity driven order the liquid crystal that control data driver 130 drives this pixel 112 again.Next, from K+1 frame, control circuit 150 carrys out first to bear rear positive liquid crystal polarity driven order the liquid crystal that control data driver 130 drives this pixel 112 again.Above-mentioned N, M and K are all natural number, and K > M > N.
Simple and clear, control circuit 150 in a Preset Time just control data driver 130 switch the liquid crystal polarity of this pixel 112 driving order, to avoid the liquid crystal of this pixel 112 to be driven with first negative just afterwards liquid crystal polarity driven order constantly, and then the liquid crystal of this pixel 112 is avoided to be applied in a direct current (DC) bias constantly and to produce branding on picture.
Above-mentioned Preset Time to follow client or display manufacturer itself to design for the tolerance of ghost, as long as the interval time of the switching of liquid crystal polarity driven order is in Preset Time.Again for Fig. 2, the 1st frame should not be greater than Preset Time to the time span of N number of frame, and N+1 frame should not be greater than Preset Time to the time span of M frame, and M+1 frame to the time span of K frame also should not be greater than Preset Time.In addition, as mentioned above, because the interval time of the switching of liquid crystal polarity driven order is in Preset Time, the interval time that therefore polarity switches can be fixing or on-fixed.
Referring again to Fig. 2, because the liquid crystal of this pixel 112 is all drive with identical polarity in N number of frame and N+1 frame, so pixel 112 can be brighter when N+1 frame.Similarly, this pixel 112 M+1 frame with also can be brighter during K+1 frame.That is, in the time of first frame after the liquid crystal polarity driven order switching this pixel 112, this pixel 112 can seem brighter.Therefore, in the time of first frame after data driver 130 switches the driving order of the liquid crystal polarity of display panel 110, control circuit 150 also can go to control backlight module 160 and reduce its brightness, to maintain the consistance of picture brightness.Again for Fig. 2, when N+1 frame, a M+1 frame and K+1 frame, control circuit 150 can go to control backlight module 160 and reduce its brightness.
Referring again to Fig. 1.In this instance, scanner driver 120 receives the initial sweep signal Ydio that time schedule controller 140 exports, and the multiple scanning impulses according to this initial sweep signal Ydio needed for output display one frame.Data driver 130 receives the data-signal DS1 that time schedule controller 140 exports, such as receive Miniature low voltage differential wave (Mini Low Voltage Differential Signaling, mini-LVDS) the data-signal DS1 of form, and drive display panel 110 to show according to data-signal DS1.
As for control circuit 150, its initial sweep signal Ydio, the first liquid crystal polarity upset signal POL1 and the first work period control signal BL_Duty1 of exporting in order to receive time schedule controller 140.When data driver 130 needs the polarity chron of the liquid crystal according to the first liquid crystal polarity driven order reversion display panel 110, first liquid crystal polarity upset signal POL1 and the first work period control signal BL_Duty1 is just sent to data driver 130 and backlight module 160 by control circuit 150 respectively, the polarity of liquid crystal of display panel 110 so that data driver 130 reverses according to the first liquid crystal polarity upset signal POL1, backlight module 160 then can operate according to the first work period control signal BL_Duty1 and present the first brightness.
And when data driver 130 needs the polarity of the liquid crystal according to the second liquid crystal polarity driven order reversion display panel 110, and when backlight module 160 need reduce its brightness, control circuit 150 can be utilize the work period reducing backlight module 160 to reduce its brightness.For example, control circuit 150 can produce the second liquid crystal polarity upset signal POL2 and work period less the second work period control signal BL_Duty2 respectively according to the first liquid crystal polarity upset signal POL1 and the first work period control signal BL_Duty1, and send data driver 130 and backlight module 160 respectively to, the polarity of liquid crystal of display panel 110 so that data driver 130 reverses according to the second liquid crystal polarity upset signal POL2, backlight module 160 then can operate according to the second work period control signal BL_Duty2 and present the second darker brightness.
In addition, control circuit 150 can be utilize the first liquid crystal polarity upset signal POL1 and initial sweep signal Ydio at least one of them to count aforesaid Preset Time.Certainly, control circuit 150 also can be adopt alternate manner or other signal is to count aforesaid Preset Time, as long as the wherein signal that the signal adopted is time schedule controller 140 to be exported.It is worth mentioning that, in this instance, data driver 130 can be adopt some reversion (dot inversion) mode to the polarity of the liquid crystal that reverses, so this and be not used to limit the present invention.In addition, control circuit 150 can be adopt complex programmable logic device (Complex Programmable Logic Device, CPLD) to realize.
Fig. 3 illustrates the liquid crystal display according to another embodiment of the present invention.In figure 3, indicate person identical with the sign in Fig. 1 and be expressed as identical object or signal.The difference of the liquid crystal display of two shown in Fig. 3 and Fig. 1, be that the liquid crystal display shown in Fig. 3 does not have backlight module, and time schedule controller in this liquid crystal display 140 and control circuit 150 are electrically connected to the test module 170 that client provides.In addition, time schedule controller 140 does not provide the first work period control signal BL_Duty1 to control circuit 150 yet.This test module 170 includes circuit system 172 and backlight module 174.Circuit system 172 is in order to provide the data-signal DS2 of another kind of form to time schedule controller 140, such as be to provide the data-signal DS2 of low-voltage differential signal form to time schedule controller 140, so that time schedule controller 140 couples of data-signal DS2 carry out format conversion and obtain data-signal DS1.In addition, circuit system 172 is also in order to provide the first work period control signal BL_Duty1 to control circuit 150.As for backlight module 174, it operates in order to the first work period control signal BL_Duty1 of sending according to control circuit 150 or the second work period control signal BL_Duty2 and presents corresponding brightness.
By above-mentioned teaching, those skilled in the art are when summarizing some basic steps that the present invention reduces the ghost of liquid crystal display, and one as shown in Figure 4.Please refer to Fig. 4, the method comprises the following steps: in a Preset Time, makes driving order (as shown in step S402) of liquid crystal display switchable liquid crystal polarity; And in the time of first frame after the driving order of liquid crystal display switchable liquid crystal polarity, reduce the brightness (as shown in step S404) of a backlight module of liquid crystal display.
In sum, the present invention is when liquid crystal display display frame, in a Preset Time, just make the driving order of liquid crystal display switchable liquid crystal polarity, and in the time of first frame after the driving order of liquid crystal display switchable liquid crystal polarity, reduce the brightness of a backlight module of liquid crystal display.Therefore, the liquid crystal of same pixel would not continue to be applied in a direct current (DC) bias, makes display frame not easily occur the phenomenon of branding again.In other words, the liquid crystal display of the method is adopted not easily will to occur ghost.And in time due to first frame of the present invention after the driving order of liquid crystal display switchable liquid crystal polarity, the brightness of a backlight module reducing liquid crystal display can be gone, thus can maintain the consistance of picture brightness.Thus, the quality of picture is just significantly improved.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the appended right person of defining.
Claims (10)
1. reduce a method for the ghost of liquid crystal display, it comprises:
In a Preset Time, make the driving order of this liquid crystal display switchable liquid crystal polarity; And
In the time of first frame after the driving order of this liquid crystal display switchable liquid crystal polarity, reduce the brightness of a backlight module of this liquid crystal display,
Wherein a control circuit is also in order to receive one first work period control signal and the one first liquid crystal polarity upset signal from time schedule controller, and when a data driver needs to reverse according to one first liquid crystal polarity driven order the polarity chron of liquid crystal of this liquid crystal display, this control circuit just sends this first liquid crystal polarity upset signal and this first work period control signal to this data driver and this backlight module respectively, and when this data driver needs to reverse according to one second liquid crystal polarity driven order the polarity of liquid crystal of this liquid crystal display, and this backlight module is when need reduce its brightness, this control circuit just produces one second liquid crystal polarity upset signal and one second work period control signal respectively according to this first liquid crystal polarity upset signal and this first work period control signal, and send this data driver and this backlight module respectively to.
2. method according to claim 1, it comprises the brightness utilizing the work period reducing this backlight module to reduce this backlight module.
3. method according to claim 1, it comprise utilize the time schedule controller of this liquid crystal display to export a wherein signal to count this Preset Time.
4. method according to claim 1, wherein this liquid crystal display to be reversed the polarity of liquid crystal in a mode for reversion.
5. method according to claim 1, wherein a display panel of this liquid crystal display is employing one direct current common potential.
6. a liquid crystal display, comprising:
One display panel;
One scan driver, is electrically connected this display panel;
One data driver, is electrically connected this display panel;
Time schedule controller, is electrically connected this scanner driver and this data driver, scans this display panel in order to control this scanner driver, and controls this display panel of this data driver drive to show; And
One control circuit, be electrically connected this data driver, this time schedule controller and a backlight module, and in a Preset Time, this control circuit just controls the driving order that this data driver switches the liquid crystal polarity of this display panel, and this data driver switch the liquid crystal polarity of this display panel driving order after first frame time in, control this backlight module and reduce its brightness
Wherein this control circuit is also in order to receive one first work period control signal and the one first liquid crystal polarity upset signal from this time schedule controller, and when this data driver needs to reverse according to one first liquid crystal polarity driven order the polarity chron of liquid crystal of this display panel, this control circuit just sends this first liquid crystal polarity upset signal and this first work period control signal to this data driver and this backlight module respectively, and when this data driver needs to reverse according to one second liquid crystal polarity driven order the polarity of liquid crystal of this display panel, and this backlight module is when need reduce its brightness, this control circuit just produces one second liquid crystal polarity upset signal and one second work period control signal respectively according to this first liquid crystal polarity upset signal and this first work period control signal, and send this data driver and this backlight module respectively to.
7. liquid crystal display according to claim 6, wherein this first work period control signal is from this time schedule controller or a circuit system.
8. liquid crystal display according to claim 6, wherein this control circuit is also in order to receive from an initial sweep signal of this time schedule controller, and in order to utilize this first liquid crystal polarity upset signal and this initial sweep signal at least one of them to count this Preset Time.
9. liquid crystal display according to claim 6, wherein this data driver to reverse the polarity of liquid crystal in a mode for reversion.
10. liquid crystal display according to claim 6, wherein this display panel is employing one direct current common potential.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101111388A TWI457908B (en) | 2012-03-30 | 2012-03-30 | A method for improving image sticking of lcd and a lcd using the same |
| TW101111388 | 2012-03-30 |
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| Publication Number | Publication Date |
|---|---|
| CN102654991A CN102654991A (en) | 2012-09-05 |
| CN102654991B true CN102654991B (en) | 2015-04-08 |
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| CN201210156388.5A Active CN102654991B (en) | 2012-03-30 | 2012-05-18 | Method for reducing afterimage of liquid crystal display and liquid crystal display using the same |
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| CN (1) | CN102654991B (en) |
| TW (1) | TWI457908B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930845B (en) * | 2012-11-15 | 2015-06-03 | 深圳市华星光电技术有限公司 | Liquid crystal display timing driver |
| TWI547932B (en) * | 2014-09-26 | 2016-09-01 | 友達光電股份有限公司 | Liquid crystal display and driving method for liquid crystal display |
| CN107256696B (en) * | 2017-07-19 | 2019-08-13 | 深圳市华星光电半导体显示技术有限公司 | The display control method and display control program of liquid crystal display device |
| CN109584831B (en) * | 2019-01-08 | 2020-10-16 | 合肥京东方显示技术有限公司 | Display compensation method and device and display device |
| CN111524479A (en) * | 2020-06-16 | 2020-08-11 | 广州视源电子科技股份有限公司 | Method, device and storage medium for eliminating ghost |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101226724A (en) * | 2007-01-15 | 2008-07-23 | Lg.菲利浦Lcd株式会社 | Liquid crystal display and driving method thereof |
| CN101471057A (en) * | 2007-12-29 | 2009-07-01 | 乐金显示有限公司 | Liquid crystal display and method for driving the same |
| CN101901582A (en) * | 2009-05-27 | 2010-12-01 | 晨星软件研发(深圳)有限公司 | Apparatus for controlling a display and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI230291B (en) * | 2003-11-17 | 2005-04-01 | Vastview Tech Inc | Driving circuit and driving method thereof for a liquid crystal display |
| TWI299483B (en) * | 2005-09-09 | 2008-08-01 | Ind Tech Res Inst | Lcd backlight apparatus and the driving method for the same |
| TW200907908A (en) * | 2007-08-08 | 2009-02-16 | Orise Technology Co Ltd | Method for driving display and display driver thereof |
| TWI397889B (en) * | 2008-01-03 | 2013-06-01 | Chi Lin Technology Co Ltd | Liquid crystal display device and method for improving flicker and residual image |
| US20100245339A1 (en) * | 2009-03-30 | 2010-09-30 | Associated Industries China, Inc. | Method of preventing image sticking on a tft-lcd |
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2012
- 2012-03-30 TW TW101111388A patent/TWI457908B/en active
- 2012-05-18 CN CN201210156388.5A patent/CN102654991B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226724A (en) * | 2007-01-15 | 2008-07-23 | Lg.菲利浦Lcd株式会社 | Liquid crystal display and driving method thereof |
| CN101471057A (en) * | 2007-12-29 | 2009-07-01 | 乐金显示有限公司 | Liquid crystal display and method for driving the same |
| CN101901582A (en) * | 2009-05-27 | 2010-12-01 | 晨星软件研发(深圳)有限公司 | Apparatus for controlling a display and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102654991A (en) | 2012-09-05 |
| TWI457908B (en) | 2014-10-21 |
| TW201340081A (en) | 2013-10-01 |
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