CN101021989A - Plasma display image sear-relieving improvement method - Google Patents
Plasma display image sear-relieving improvement method Download PDFInfo
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- CN101021989A CN101021989A CN 200610007565 CN200610007565A CN101021989A CN 101021989 A CN101021989 A CN 101021989A CN 200610007565 CN200610007565 CN 200610007565 CN 200610007565 A CN200610007565 A CN 200610007565A CN 101021989 A CN101021989 A CN 101021989A
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Abstract
This invention puts forward a method for reducing and improving image marks of plasma display (PDP) including: a conversion unit converting the relationship of a stage and brightness of an input signal to linear one, a static picture detection unit deciding if the image displayed in the picture is static or dynamic and further let its compensation parameter of its adjustment gain negative or positive, a brightness adjustment unit adjusting the brightness of the picture with the gain value along with the detection result of the static picture detection unit, then the picture elements of the input image multiply the corresponding gain value before output then to be output.
Description
Technical field
What the present invention system related to a kind of plasma display (PDP) dent alleviates the improvement method.
Background technology
(Plasma Display Panel PDP) is the main flow of present large scale flat-panel screens to plasma display, advantages such as it possesses big picture is arranged, high image quality, wide viewing angle, low radiation and thin thickness; Yet, still there is the problem of dent (Image Sticking) at present in plasma display, that is to say, when plasma display shows that tableaux is after a period of time, image in its picture can produce residual phenomena, as shown in Figure 1, light the printed words 20a of a PDP when plasma display 10, make it through showing after a while, then allow plasma display show as shown in Figure 2 dark picture or during complete white picture as shown in Figure 3, previous PDP printed words will remain on the picture and form described dent 20b, 20c, this is a ubiquitous problem on the present plasma display.
Based on the problems referred to above, at present industry has developed and several solutions, and relevant existing method and the shortcoming division that improves the plasma display dent is as follows:
1. pan method: be when still frame, to allow picture up and down or the several picture elements of tilted direction translation, avoid image fixedly to be parked on certain position with this every several seconds or a few minutes; But, this method is effect and bad in practical application, because picture element that can only mobile minute quantity when utilizing this pan method moving image, otherwise the user sees the shake when frame out moves easily or cause the picture border to shift out the situation of viewing area, as shown in Figure 1, show that the PDP font size is promptly because occupied quite large-area picture element, make picture element translation by a small margin also can't allow the bright word of script PDP move on to non-luminous dark space, that is to say, during the picture show state of image pattern 1, its still frame utilizes the pan method and can't improve the dent phenomenon.
2. image gray scale reversal process: be being lighted of utilizing that the image of gray-scale inversion makes that the whole image of plasma display can be average and reach the uniform purpose of characteristic, and then alleviate the dent phenomenon; After PDP script figure as shown in Figure 1 is lighted a break time, make its picture with the identical PDP font of a white gravoply, with black engraved characters light a period of time again, with the balance panel characteristics and then alleviate the dent phenomenon, yet there is following problem in this method:
A. can't precisely determine the time of gray-scale inversion, when the image reversing time is long, may cause the dent of other direction;
B. gray-scale inversion image that can't complete generation still frame, when for example watching the broadcast program as the BShi radio station, the printed words of Bshi can appear at the upper right corner of picture for a long time, this upper right corner promptly can produce the dent of Bshi after a period of time, and in this case, and the gray-scale inversion image that can't only produce the BShi font alleviates the dent phenomenon.
3. the white stick picture of running is removed method: be to utilize about the stick that white runs or up and down reciprocatingly run, see through similar rain brush and remove the purpose that the mode of rainwater reaches the removing dent, but, this method obviously the shadow that strip moves will occur on image frame, cause beholder's sense of discomfort.
4. with the complete white hot machine method of picture: mainly be the mode of utilizing the complete white hot machine of picture, allow whole image frame characteristic reach unanimity; Yet alleviating the dent phenomenon in this mode needs the hot machine a very long time usually, and alleviates the effect of dent phenomenon and be not so good as expection.
Summary of the invention
At defective that exists in the prior art and deficiency, what fundamental purpose of the present invention provided a kind of plasma display (PDP) image dent alleviates the improvement method, removes method and the complete white hot machine method of picture and still exists and can't be applicable to various image frames and alleviate the not good enough problem of effect of improving dent to improve the existing method of improving the plasma display dent such as pan method, image gray scale reversal process, the white stick picture of running.
In order to address the above problem, what the present invention proposed a kind of plasma display (PDP) image dent alleviates the improvement method, comprising:
One converting unit is that GTG and the brightness relationship with input signal converts linear relationship to, is beneficial to ball bearing made using to reach the purpose of inferring the expection brightness value accurately with the GTG value;
One still frame detecting unit, be to utilize the image of picture temporary storage buffer region (Frame Buffer) when be t writing time, through again the image of time t and the image of time t+ Δ t being compared behind the Δ t after a while, be static images or dynamic image with the image that is presented in the decision picture element; When the image in judging picture element was static images, making brightness adjust gain compensation parameters was a negative value, if judge when image in the picture element is dynamic image, then make brightness adjust gain compensation parameters be one on the occasion of;
One picture brightness adjustment unit: be to utilize the picture gain temporary storage buffer region to write down the pairing yield value of each picture element, described yield value is along with the result of still frame detecting unit detecting adjusts, when the still frame detecting unit detects image on the picture element when being static images, then the pairing yield value of this picture element in the picture gain temporary storage buffer region is added its pairing negative value luminance gain penalty coefficient, advance to reduce yield value; Otherwise, then the pairing yield value of this picture element in the picture gain temporary storage buffer region is added that it pairingly strengthens its yield value on the occasion of the luminance gain penalty coefficient; Each picture element that to import image then can reach the purpose that downgrades static images brightness in the output again behind the pairing yield value with it of output external reservoir.
Plasma display (PDP) the image dent that the present invention proposes alleviate the improvement method, utilize the part of initiatively detecting static picture element in the plasma display panel image frame, and then reduce the brightness (discharge time) of stationary part in the picture automatically, reach the purpose that initiatively suppresses dent, therefore all can reach the same inhibition effect that alleviates for the static images dent of large tracts of land or locality, and can not influence normally manifesting of image frame fully, also need not eliminate dent with the complete white hot machine of picture, really can improve the scarce fraud that solves every existing method in the prior art, reach the practical improvement that significantly promotes plasma display usefulness and quality.
Description of drawings
Fig. 1 is the floor map of the normal display frame of general plasma display.
Fig. 2 is that plasma display shown in Figure 1 shows dark picture and the synoptic diagram of dent occurs.
Fig. 3 is that plasma display shown in Figure 1 shows complete white picture and the synoptic diagram of dent occurs.
Fig. 4 is the system flow synoptic diagram of the preferred embodiment of the present invention.
Embodiment
The present invention will be further described with reference to the accompanying drawings below.
Be illustrated in figure 4 as the preferred embodiment that alleviates the improvement method of plasma display (PDP) the image dent of the present invention's proposition, be divided into four major parts: first part is that Gamma converting unit 30, second part are that still frame detecting unit 40, the 3rd part are that picture brightness adjustment unit 50, the 4th part are that grey exponent number promotes and GTG brightness transition unit 60, now carefully states as follows with regard to the function of each several part:
1, the Gamma converting unit 30: be that GTG and brightness relationship with input signal converts linear relationship to; The relation that presents Gamma 0.45 between the brightness of its GTG of for example traditional video signal and representative, this moment, Gamma converting unit 30 was carried out input signal the conversion of Gamma 2.2, make GTG and brightness become a kind of linear relationship, and described GTG value and brightness will help reaching the purpose of inferring the brightness value of expection accurately with the GTG value with simple circuit when being linear dependence.
2, the still frame detecting unit 40: this element is to utilize the image of a picture temporary storage buffer region 41 (Frame Buffer) when be t writing time, through again the image of time t and the image of time t+ Δ t being compared behind the Δ t after a while, be static images or dynamic image with the image that is presented in the decision picture element; Image to time t and time t+ Δ t carries out low-pass filtering treatment to reduce The noise earlier before carrying out the static images judgement, when the image in judging picture element is static images, making brightness adjust gain compensation parameters c is a negative value, makes c=-1 as shown in Figure 4; When if the image in the picture element is dynamic image, make brightness adjust gain compensation parameters c be one on the occasion of, make c=+2 as shown in Figure 4.
3, the picture brightness adjustment unit 50: this element utilizes the pairing yield value Gain of picture gain temporary storage buffer region 42 each picture element of record (x, y), the result that yield value in this picture gain temporary storage buffer region is detected along with still frame detecting unit 40 adjusts, when still frame detecting unit 40 detects image on the picture element when being static images, then with the pairing yield value of this picture element in the picture gain temporary storage buffer region, add its pairing luminance gain penalty coefficient c (this moment, c was a negative value), to reduce its yield value; Otherwise, when still frame detecting unit 40 detects image on the picture element when being dynamic image, then with the pairing yield value of this picture element in the picture gain temporary storage buffer region, add that its pairing luminance gain penalty coefficient c (this moment c on the occasion of) can strengthen its yield value; Each picture element that to import image then can reach the purpose that downgrades static images brightness in the output again behind the pairing yield value with it of output external reservoir.In practical application, the yield value that picture gain temporary storage buffer region 42 in the unit can be write down amplifies 256 times (2
nDoubly), after the input image multiply by the yield value of this amplification, before output, export divided by 256 backs again; So, can improve the resolution and the required hardware resource of short-cut multiplication (division) of yield value; (t=0) makes that yield value is 256 when the time just begins, when if picture is a static images, through (t=Δ t) yield value after the time of Δ t is 256-1=255, yield value after the time of time t=n* Δ t in the picture temporary storage buffer region is reduced to 256-n, and image multiply by this can reach the purpose that reduces still frame brightness divided by 256 after less than 256 yield value again; Otherwise, when picture is dynamic image, then improve its pairing yield value to reply this regional image brilliance.For avoiding causing stagnant zone brightness to cross situation low or that dynamic area brightness is too high after the brightness adjustment, exist the yield value in the picture gain temporary storage buffer region (42) need give a restriction, the amplitude peak that can limit stagnant zone brightness reduction when limiting gain value minimum is 64 is 1/4 of an original brightness, the limiting gain value is 256 to the maximum and can avoids the dynamic area pairing yield value of its picture element after adding the luminance gain penalty coefficient again, can cause greater than 256 picture than normal come bright.
4, grey exponent number promotes and GTG brightness transition unit 60: can carry out multiplying to image at picture brightness adjustment unit (50), because digital circuit is after multiplying, the GTG details of the decimal part that produces can't directly be presented on the display, in order effectively to promote the details performance of display, this unit can utilize the error-diffusion method (Spacial Error Diffusion) in space or GTG performance that the method for perturbation (Dithering) of time increases image output.
What remark additionally is, aforementioned image gray scale is before exporting to display, because the GTG of plasma display module and the configuration of brightness (discharge time) be linear relationship not necessarily, for more accurate our the desired dent that reaches alleviates the inhibition effect, image gray scale can carry out the conversion of image gray scale and plasma display panel brightness (discharge time) relation earlier before exporting display to, make the relation of image gray scale and luminosity can keep linear relation.
Claims (7)
1, a kind of plasma display (PDP) image dent alleviate the improvement method, comprising:
One converting unit is that GTG and the brightness relationship with input signal converts linear relationship to, is beneficial to ball bearing made using to reach the purpose of inferring the expection brightness value accurately with the GTG value;
One still frame detecting unit, be to utilize the image of picture temporary storage buffer region (Frame Buffer) when be t writing time, through again the image of time t and the image of time t+ Δ t being compared behind the Δ t after a while, be static images or dynamic image with the image that is presented in the decision picture element; When the image in judging picture element was static images, making brightness adjust gain compensation parameters was a negative value, if judge when image in the picture element is dynamic image, then make brightness adjust gain compensation parameters be one on the occasion of;
One picture brightness adjustment unit: be to utilize the picture gain temporary storage buffer region to write down the pairing yield value of each picture element, described yield value is along with the result of still frame detecting unit detecting adjusts, when the still frame detecting unit detects image on the picture element when being static images, then the pairing yield value of this picture element in the picture gain temporary storage buffer region is added its pairing negative value luminance gain penalty coefficient, advance to reduce yield value; Otherwise, then the pairing yield value of this picture element in the picture gain temporary storage buffer region is added that it pairingly strengthens its yield value on the occasion of the luminance gain penalty coefficient; Each picture element that to import image then can reach the purpose that downgrades static images brightness in the output again behind the pairing yield value with it of output external reservoir.
2, plasma display according to claim 1 (PDP) image dent alleviates the improvement method, it is characterized in that, described still frame detecting unit is before carrying out the static images judgement, and the image to time t and time t+ Δ t carries out low-pass filtering treatment earlier, to reduce The noise.
3, plasma display according to claim 1 (PDP) image dent alleviates the improvement method, it is characterized in that, the yield value that picture gain temporary storage buffer region in the picture brightness adjustment unit is write down amplifies 256 times, after the input image multiply by this gain amplifier value, before output, export divided by 256 backs again.
4, a kind of plasma display (PDP) image dent alleviate the improvement method, comprising:
One converting unit is to utilize GTG and brightness relationship with input signal to convert linear relationship to, is beneficial to ball bearing made using to reach the purpose of inferring the expection brightness value accurately with the GTG value;
One still frame detecting unit, be to utilize the image of picture temporary storage buffer region (Frame Buffer) when be t writing time, through again the image of time t and the image of time t+ Δ t being compared behind the Δ t after a while, be static images or dynamic image with the image that is presented in the decision picture element; When the image in judging picture element was static images, making brightness adjust gain compensation parameters was a negative value, if judge when image in the picture element is dynamic image, then make brightness adjust gain compensation parameters be one on the occasion of;
One picture brightness adjustment unit: be to utilize the picture gain temporary storage buffer region to write down the pairing yield value of each picture element, described yield value is along with the result of still frame detecting unit detecting adjusts, when the still frame detecting unit detects image on the picture element when being static images, then the pairing yield value of this picture element in the picture gain temporary storage buffer region is added its pairing negative value luminance gain penalty coefficient, advance to reduce yield value; Otherwise, then the pairing yield value of this picture element in the picture gain temporary storage buffer region is added that it pairingly strengthens its yield value on the occasion of the luminance gain penalty coefficient; Each picture element that to import image then can reach the purpose that downgrades static images brightness in the output again behind the pairing yield value with it of output external reservoir;
The ash exponent number promotes and GTG brightness transition unit, to increase the GTG performance of image output.
5, plasma display according to claim 4 (PDP) image dent alleviates the improvement method, it is characterized in that, described still frame detecting unit is before carrying out the static images judgement, and the image to time t and time t+ Δ t carries out low-pass filtering treatment earlier, to reduce The noise.
6, plasma display according to claim 4 (PDP) image dent alleviates the improvement method, it is characterized in that, the yield value that picture gain temporary storage buffer region in the picture brightness adjustment unit is write down amplifies 256 times, after the input image multiply by this gain amplifier value, before output, export divided by 256 backs again.
7, plasma display according to claim 4 (PDP) image dent alleviates the improvement method, it is characterized in that described grey exponent number promotes and the error-diffusion method (Spacial Error Diffusion) in GTG brightness transition unit by using space or the GTG performance that the method for perturbation (Dithering) of time increases image output.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950528A (en) * | 2009-12-31 | 2011-01-19 | 四川虹欧显示器件有限公司 | Linear adjustment method of gray scales of PDP (Plasma Display Panel) |
| CN110580871A (en) * | 2019-08-07 | 2019-12-17 | 深圳市华星光电半导体显示技术有限公司 | method for intelligently compensating residual shadow |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100266212B1 (en) * | 1997-05-17 | 2000-09-15 | 구본준; 론 위라하디락사 | Lcd with the function of removing residual image |
| 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 |
| CN100350441C (en) * | 2004-01-17 | 2007-11-21 | 深圳创维－Rgb电子有限公司 | Intelligent ghost-eliminating method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950528A (en) * | 2009-12-31 | 2011-01-19 | 四川虹欧显示器件有限公司 | Linear adjustment method of gray scales of PDP (Plasma Display Panel) |
| CN101950528B (en) * | 2009-12-31 | 2012-06-27 | 四川虹欧显示器件有限公司 | Linear adjustment method of gray scales of PDP (Plasma Display Panel) |
| CN110580871A (en) * | 2019-08-07 | 2019-12-17 | 深圳市华星光电半导体显示技术有限公司 | method for intelligently compensating residual shadow |
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