CN101192388B - Image residue avoiding method - Google Patents
Image residue avoiding method Download PDFInfo
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- CN101192388B CN101192388B CN200610163947XA CN200610163947A CN101192388B CN 101192388 B CN101192388 B CN 101192388B CN 200610163947X A CN200610163947X A CN 200610163947XA CN 200610163947 A CN200610163947 A CN 200610163947A CN 101192388 B CN101192388 B CN 101192388B
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- display rate
- image residue
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Abstract
The invention discloses a method for avoiding the image-sticking effect, which is suitable for regulating a static picture. The method for avoiding the image-sticking effect of the invention comprises the following steps: firstly, a grayscale display rate is calculated; the picture displayed by each pixel unit corresponds to a grayscale display rate; secondly, the difference between the grayscale display rates of two pixel units is calculated; thirdly, whether the difference is more than a critical value is decided; when the difference is more than the critical value, the grayscale display rates of two pixel units are regulated so as to ensure that the difference is less than the critical value.
Description
Technical field
The present invention is relevant for a kind of method of avoiding image residue, and is particularly to the method that a kind of display frame of avoiding LCD produces image residue.
Background technology
Social now multimedia technology is quite flourishing, is indebted to the progress of semiconductor element and display device mostly.With regard to display, have that high image quality, space utilization efficient are good, the LCD of low consumpting power, advantageous characteristic such as radiationless becomes the market mainstream gradually.
Particularly, LCD is commonly used to show dynamically or tableaux.It should be noted that behind the long-time demonstration of LCD one tableaux when then showing other picture again, last an image that display frame left behind or a profile are arranged easily.This is owing to the demonstration of the liquid crystal molecule in the LCD for long-time cooperation tableaux, and routinely is subjected to high voltage drive, causes liquid crystal ion concentration (Ion density) to increase.When liquid crystal display displays next one picture, because partly the ion concentration in zone changes, so driving voltage just can't be controlled the ordered state of this regional liquid crystal molecule exactly.This picture that can cause LCD to present in this zone has the situation of GTG brightness not as expection, thereby presents darker or brighter image contour in next display frame.
LCD is under the situation of full-color demonstration, and display frame can't effectively be controlled the phenomenon that makes picture that colour cast be arranged because of GTG brightness probably.The bad color offset phenomenon of this kind can impact by direct display quality to LCD, and the necessity of improvement is arranged in fact.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of method of avoiding image residue, the problem of image residue is arranged easily to solve existing LCD.
For reaching above-mentioned or other purposes, the present invention proposes a kind of method of avoiding image residue, and it is suitable for a tableaux of LCD is adjusted, and tableaux is shown by corresponding a plurality of pixel cells.The method of image residue of avoiding of the present invention comprises: at first, calculate a GTG display rate, wherein the shown picture of each pixel cell can correspond to a GTG display rate.Then, calculate the difference of the GTG display rate of two pixel cells in the tableaux.Then, judge that whether difference is greater than a critical value.When difference during, adjust the GTG display rate of two pixel cells, so that difference is less than critical value greater than critical value.But wherein above-mentioned GTG display rate equals the maximum gray number of the grey exponent number of the shown picture of pixel cell divided by pixel cell display frame
In an embodiment of the present invention, above-mentioned difference is during greater than critical value, and the method for adjusting the GTG display rate of two pixel cells can comprise: the GTG display rate that two pixel cells are corresponding respectively is adjusted to identical certain value.
In an embodiment of the present invention, above-mentioned definite value can be the pairing bigger GTG display rate of two pixel cells.
In an embodiment of the present invention, above-mentioned definite value can be the pairing less GTG display rate of two pixel cells.
In an embodiment of the present invention, above-mentioned definite value can be 1.
In an embodiment of the present invention, above-mentioned definite value can be 0.
In an embodiment of the present invention, above-mentioned difference is during greater than critical value, and the method for adjusting the GTG display rate of two pixel cells can comprise: the GTG display rate that two pixel cells are corresponding respectively exchanges originally.
In an embodiment of the present invention, two pixel cells that are adjusted of above-mentioned GTG display rate are adjacent one another are.
In an embodiment of the present invention, above-mentioned pixel cell can comprise ruddiness pixel cell, green glow pixel cell and blue light pixel cell.
In an embodiment of the present invention, above-mentioned maximum gray number can be 256.
Because of the present invention to avoid the method for image residue be in tableaux, by adjusting the pairing GTG display rate of pixel cell, the liquid crystal ion concentration can be even in the corresponding zone of each pixel cell and make.LCD is when showing next picture like this, and the ordered state of liquid crystal molecule just can be controlled well by driving voltage, and then can effectively avoid the phenomenon of image residue to take place.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 is the synoptic diagram of the display frame of LCD of the present invention.
Fig. 2 is the schematic flow sheet that the present invention avoids the method for image residue.
Fig. 3 be the static display frame of the present invention the synoptic diagram of corresponding volume GTG display rate data.
Embodiment
Fig. 1 is the synoptic diagram of the display frame of LCD of the present invention.Please refer to Fig. 1, LCD 100 general using always of the present invention to show tableaux and dynamic menu.For example, zone 101 can present tableaux in the LCD 100 of the present invention, and zone 102 can present dynamic menu.Wherein, zone 101 tableauxs that presented can be trade mark, channel designation or the program title etc. of TV and Radio Corporation.Certainly, have in the affiliated technical field and know that usually the knowledgeable should know 101 range size that present tableaux in zone of Fig. 1, only, do not limited at this in order to explanation.
On the practice, tableaux can be presented jointly by 110 of corresponding a plurality of pixel cells.For the needs of full-color demonstration, pixel cell 110 can be red pixel unit 110R, green pixel unit 110G or blue pixel unit 110B.In general, red pixel unit 110R, a green pixel unit 110G and a blue pixel unit 110B can constitute a main pixel cell (Main pixel unit).The ruddiness, green glow and the blue light that are sent respectively by red pixel unit 110R, green pixel unit 110G and blue pixel unit 110B are to blend display frame color to be presented.
Have the phenomenon of image residue to take place for fear of LCD 100 because of the long-term tableaux (zone 101) that shows, the present invention avoids the method for image residue to adjust the tableaux that LCD 100 is presented.Fig. 2 is the schematic flow sheet that the present invention avoids the method for image residue.Please refer to Fig. 2, at first carry out step S1: calculate a GTG display rate DR (Display ratio).Here be noted that each pixel cell 110 shown picture can correspond to a GTG display rate DR.Wherein, but GTG display rate DR can equal the maximum gray number of the grey exponent number of display frame divided by display frame.
For instance, but the maximum gray number of general display frame is 256, and the pairing display frame ash of red pixel unit 110R exponent number is 200, and the GTG display rate DR of back red pixel unit 110R is 0.78 (200/256=0.78) as calculated.Here be noted that under the setting of the white picture of normality (Normally white) the lower display frame of GTG display rate DR is darker, the suffered driving voltage of liquid crystal molecule is also healed big.Otherwise the GTG display rate DR high display frame of healing is brighter, and the suffered driving voltage of liquid crystal molecule is also little.Certainly, have in the affiliated technical field and know that usually numerical values recited that the knowledgeable should know above-mentioned GTG display rate DR only in order to explanation, also is not intended to limit to application range at this.
Please continue with reference to figure 2, then carry out step S2: the difference DELTA DR that calculates the GTG display rate DR of wantonly two pixel cells 110 in the tableaux.Carry out step S3 then: judge that whether difference DELTA DR is greater than a critical value L.Here the difference DELTA DR that is noted that two pixel cells 110 is excessive, means the driven that the liquid crystal molecule in two pixel cells, 110 respective regions is differed greatly respectively.Under the situation of long-time demonstration tableaux, be easy to cause liquid crystal ion concentration (Ion density) difference in two pixel cells, 110 respective regions excessive, and then cause display frame that the problem of image residue is arranged easily.Therefore, as the difference DELTA DR of GTG display rate DR during, just must carry out step S4: adjust the GTG display rate DR of two pixel cells 110, so that difference DELTA DR is less than critical value L greater than critical value L.
Thus, the difference DELTA DR of the GTG display rate DR by reducing by two pixel cells 110 is effectively to avoid liquid crystal ion concentration (Ion density) difference in two pixel cells, 110 respective regions excessive.This can prevent effectively that display frame from having the phenomenon generation of image residue.On the practice, the big I of critical value L adjusts according to the characteristic of employing liquid crystal molecule.What will specify here is that the method for image residue of avoiding of the present invention can be adjusted the GTG display rate DR of wantonly two pixel cells 110 in the tableaux.This two pixel cell 110 can be to be arranged in same main pixel cell, and this two pixel cell 110 also lays respectively in the different main pixel cells, in this not painstakingly restriction.In addition, the method for avoiding image residue of the present invention has the mode of multiple adjustment GTG display rate DR, will elaborate below.
Fig. 3 is the schematic diagram data of the pairing GTG display rate of the static display frame of the present invention.Please also refer to Fig. 1 and Fig. 3, the 1st group of data are that red pixel unit 110R, green pixel unit 110G and blue pixel unit 110B are adjusted preceding GTG display rate, wherein the GTG display rate DR of red pixel unit 110R is 0.78, the GTG display rate DR of green pixel unit 110G is 0.78, and the GTG display rate DR of blue pixel unit 110B is 0.04.
As the difference DELTA DR of the GTG display rate DR (0.78) of red pixel unit 110R and the GTG display rate DR (0.04) of blue pixel unit 110B during, the GTG display rate can be adjusted to identical certain value greater than critical value L (for example being 0.7).Shown in the 2nd group of data, the GTG display rate DR of red pixel unit 110R and blue pixel unit 110B can tune to 1, and green pixel unit 110G also is adjusted to 1 in the lump.Here be noted that GTG display rate DR is subjected to adjusted red pixel unit 110R, blue pixel unit 110B and green pixel unit 110G can demonstrate the brightest picture.Under the setting of the white picture of normality, this liquid crystal molecule that means in red coloration pixel cell 110R, green pixel unit 110G and the blue pixel unit 110B respective regions can effectively avoid being subjected to high voltage drive, and then prevents that the liquid crystal ion concentration from having bad rising phenomenon.
Certainly, under the setting of the black picture (Normally Black) of normality, the GTG display rate DR of red pixel unit 110R, green pixel unit 110G and blue pixel unit 110B can all be adjusted to 0, and this all can adjust according to the setting of display panels itself.Thus, by adjusting GTG display rate DR, and the difference DELTA DR of the GTG display rate DR of red pixel unit 110R, blue pixel unit 110B and green pixel unit 110G can effectively be dwindled, and then prevent that effectively display frame from having the phenomenon generation of image residue.
In addition, shown in the 3rd group of data, GTG display rate DR also can be adjusted into GTG display rate DR the maximum among original each pixel cell 110R, 110G and the 110B.The numerical value of the GTG display rate DR of red pixel unit 110R, green pixel unit 110G and blue pixel unit 110B can all be adjusted to 0.78, this can dwindle the difference DELTA DR of GTG display rate DR equally, and can prevent effectively that display frame from having the phenomenon generation of image residue.
Certainly, GTG display rate DR also can be adjusted into GTG display rate DR reckling among original each pixel cell 110R, 110G and the 110B.Shown in the 4th group of data, the numerical value of the GTG display rate DR of red pixel unit 110R, green pixel unit 110G and blue pixel unit 110B can all be adjusted to 0.04.In addition, if when the display frame of LCD 100 is entirely tableaux, then each GTG display rate DR of tableaux can be downgraded 0 (shown in the 5th group of data).
The method that the present invention adjusts GTG display rate DR also can comprise: the corresponding respectively GTG display rate DR of two pixel cells 110 exchanges originally.Shown in the 6th group of data, the GTG display rate DR of red pixel unit 110R is adjusted to 0.04 (the GTG display rate DR of the 1st group of data Smalt pixel cell 110B) from original 0.78, and the GTG display rate DR of blue pixel unit 110B is from original 0.04 being adjusted to 0.78 (the GTG display rate DR of red pixel unit 110R the 1st group of data), and the GTG display rate DR of green pixel unit 110G also is adjusted to 0.04 from original 0.78.
This means that the originally suffered driving voltage of liquid crystal molecule in red pixel unit 110R (or green pixel unit 110G) and the blue pixel unit 110B respective regions can exchange mutually.Thus, the liquid crystal ion concentration in the pixel region just can be compensated and reach unanimity separately, and then prevents that effectively display frame from having the phenomenon generation of image residue.
In sum, because of the present invention to avoid the method for image residue be in tableaux, by adjusting the GTG display rate, excessive to avoid in each pixel cell respective regions liquid crystal ion concentration difference.LCD is when showing next picture like this, and liquid crystal molecule just can be controlled well by driving voltage, and then can effectively avoid the phenomenon of image residue to take place.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (10)
1. a method of avoiding image residue is suitable for a tableaux of LCD is adjusted, and this tableaux is shown by corresponding a plurality of pixel cells, and this is avoided the method for image residue to comprise:
Calculate a GTG display rate, wherein the shown picture of each pixel cell can correspond to a GTG display rate, but this GTG display rate equals the maximum gray number of the grey exponent number of the shown picture of this pixel cell divided by this pixel cell display frame;
Calculate the difference of the GTG display rate of two pixel cells in this tableaux;
Whether judge this difference greater than a critical value,, adjust the GTG display rate of two pixel cells, so that this difference is less than this critical value when this difference during greater than this critical value.
2. the method for avoiding image residue as claimed in claim 1 is characterized in that, when this difference during greater than this critical value, the method for adjusting the GTG display rate of two pixel cells comprises:
The GTG display rate that two pixel cells are corresponding respectively is adjusted to identical certain value.
3. the method for avoiding image residue as claimed in claim 2 is characterized in that, this definite value is the pairing bigger GTG display rates of two pixel cells.
4. the method for avoiding image residue as claimed in claim 2 is characterized in that, this definite value is the pairing less GTG display rates of two pixel cells.
5. the method for avoiding image residue as claimed in claim 2 is characterized in that, this definite value is 1.
6. the method for avoiding image residue as claimed in claim 2 is characterized in that, this definite value is 0.
7. the method for avoiding image residue as claimed in claim 1 is characterized in that, when this difference during greater than this critical value, the method for adjusting the GTG display rate of two pixel cells comprises:
Originally the GTG display rate that two pixel cells are corresponding is respectively exchanged.
8. the method for avoiding image residue as claimed in claim 1 is characterized in that, two pixel cells that this GTG display rate is adjusted are adjacent one another are.
9. the method for avoiding image residue as claimed in claim 1 is characterized in that, those pixel cells comprise ruddiness pixel cell, green glow pixel cell and blue light pixel cell.
10. the method for avoiding image residue as claimed in claim 1 is characterized in that, this maximum gray number is 256.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610163947XA CN101192388B (en) | 2006-11-29 | 2006-11-29 | Image residue avoiding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610163947XA CN101192388B (en) | 2006-11-29 | 2006-11-29 | Image residue avoiding method |
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| CN101192388A CN101192388A (en) | 2008-06-04 |
| CN101192388B true CN101192388B (en) | 2010-06-16 |
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| CN200610163947XA Expired - Fee Related CN101192388B (en) | 2006-11-29 | 2006-11-29 | Image residue avoiding method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101996591B (en) * | 2009-08-28 | 2012-07-25 | 北京京东方光电科技有限公司 | Method for improving liquid crystal display image sticking and liquid crystal display driving device |
| TWI434274B (en) * | 2011-10-18 | 2014-04-11 | Au Optronics Corp | Display and pixel driving method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1183604A (en) * | 1996-11-26 | 1998-06-03 | 夏普株式会社 | Erasing device for liquid crystal display image and liquid crystal display device including the same |
| US6313878B1 (en) * | 1998-11-20 | 2001-11-06 | Sony Corporation | Method and structure for providing an automatic hardware-implemented screen-saver function to a display product |
| CN1727946A (en) * | 2004-07-28 | 2006-02-01 | 夏普株式会社 | Liquid crystal display device and driving method therefor |
| CN1801303A (en) * | 2004-07-30 | 2006-07-12 | 统宝光电股份有限公司 | Afterimage eliminate circuit, integrate circuit, display and electronic device |
-
2006
- 2006-11-29 CN CN200610163947XA patent/CN101192388B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1183604A (en) * | 1996-11-26 | 1998-06-03 | 夏普株式会社 | Erasing device for liquid crystal display image and liquid crystal display device including the same |
| US6313878B1 (en) * | 1998-11-20 | 2001-11-06 | Sony Corporation | Method and structure for providing an automatic hardware-implemented screen-saver function to a display product |
| CN1727946A (en) * | 2004-07-28 | 2006-02-01 | 夏普株式会社 | Liquid crystal display device and driving method therefor |
| CN1801303A (en) * | 2004-07-30 | 2006-07-12 | 统宝光电股份有限公司 | Afterimage eliminate circuit, integrate circuit, display and electronic device |
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Granted publication date: 20100616 Termination date: 20191129 |