CN104318893A - Method and system for eliminating afterimage defect of static-state image display area - Google Patents
Method and system for eliminating afterimage defect of static-state image display area Download PDFInfo
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Abstract
The invention discloses a method and system for eliminating an afterimage defect of a static-state image display area, and is applied to a self-luminous display apparatus. The static-state image display area comprises at least two sub pixels of the same type yet with different grayscale values. The method comprises: obtaining the first grayscale value of a sub pixel of a reference type corresponding to the static-state image display area, wherein the reference type is any one from RGB types, and the first grayscale value is the maximum grayscale value in the grayscale values of all the sub pixels of the reference type; according to the first grayscale value, determining a second grayscale value, the second grayscale value being greater than or equal to the first grayscale value; and driving a reference sub pixel to work continuously for corresponding reference compensation time, and closing a sub pixel whose grayscale value is equal to the second grayscale value, wherein the reference sub pixel is any one sub pixel of the reference type, whose grayscale value is smaller than the second grayscale value, and the reference compensation time is the continuous work time of the reference sub pixel. By using the technical scheme provided by the embodiments of the invention, once an image of the self-luminous display apparatus generates the afterimage defect problem, the problem can be rapidly eliminated.
Description
Technical field
The present invention relates to image display arts, particularly relate to the method and system that ghost defect is eliminated in a kind of still image viewing area.
Background technology
At present, OLED (Organic Light-Emitting Diode prepared by organic material, Organic Light Emitting Diode) the display fast response time, the visual angle that show because of autoluminescence be wide, separately can be curled, the folding or application that obtains widely as the part of wearable computer.
In OLED display, for the sub-pixel of same kind, if there is luminance difference between each sub-pixel, in procedure for displaying, because the brightness of each sub-pixel is different, the size of the drive current that each sub-pixel needs is also different, namely the sub-pixel that brightness is higher, the drive current that its needs provide is also larger, therefore cause the heating temp of each sub-pixel also not identical, increase with the working time, each sub-pixel is caused to there is expendable catabiosis, and then cause the brightness of each sub-pixel all to there is certain decay, according to the brightness decay curve of sub-pixel as shown in Figure 1, the luminance degradation rate of the sub-pixel of same kind is also uneven, brightness is higher, namely the temperature of sub-pixel is higher, therefore it is aging also faster, and then it is faster to cause gray-scale intensity to decay, this phenomenon shows image quality aspect, especially when after tableaux display longer a period of time, now, if switched picture, picture after switching there will be the ghost of former tableaux, be difficult to eliminate, affect the display effect of self-emission display apparatus.
In prior art, because the brightness of sub-pixel and the rate of decay are directly proportional, the sub-pixel that brightness is higher, in procedure for displaying, heating temp is higher, aging speed is also faster, cause brightness decay faster, therefore when the luminance difference of the sub-pixel of identical type is larger, along with the increase of time, the brightness decay gap of each sub-pixel also can be increasing, example, if a tableaux has two red sub-pixel, its GTG is respectively 255 GTGs and 100 GTGs, after one hour, the brightness decay of the red sub-pixel of 255 GTGs is 200 GTGs, and the brightness decay of the red sub-pixel of 100 GTGs is 80 GTGs, the red sub-pixel of former 255 GTGs has decayed 55 GTGs, 20 GTGs and the red sub-pixel of 100 GTGs has only decayed, brightness decay difference between two red sub-pixel differs 35 GTGs, differ greatly, therefore, when especially showing for still frame, usually overall dynamics reduction or partial dynamic is adopted to reduce the display brightness of display sub-pixel in prior art, each sub-pixel is made to be in the duty of low-light level, with the luminance degradation rate's difference between the sub-pixel slowing down same kind, weaken the possibility that ghost occurs to a certain extent.
Present inventor, in the process realizing invention technical scheme in the embodiment of the present application, finds following technical matters:
Essence due to ghost problem is because display brightness is different by same kind sub-pixel, thus displays temperature differs greatly, aging speed between sub-pixel is inconsistent, finally cause that luminance degradation rate is also different to cause, as long as the brightness decay size of the sub-pixel of same kind is variant just easily occur ghost, this is that the character of OLED display device itself causes, therefore, iff the display brightness relying on adjustment picture, thoroughly can not eliminate ghost, if a certain picture of long-time display, after ghost occurs, be difficult to automatically eliminate, so that it is forever residual, affect image display quality.
Summary of the invention
The embodiment of the present application object is to provide the method and system that ghost defect is eliminated in a kind of still image viewing area, solve after showing tableaux for a long time in prior art, easily there is the ghost not easily eliminated in self-emission display apparatus, making the picture of self-emission display apparatus as there is ghost defect problem, quick elimination can be realized.
The embodiment of the present application provides a kind of method eliminating still image viewing area ghost defect, be applied to self-emission display apparatus, but described still image viewing area comprises the sub-pixel of at least two different grey decision-making of the same type, this method comprises: the first grey decision-making obtaining the sub-pixel of reftype corresponding to described still image viewing area, described reftype is any one in RGB type, and described first grey decision-making is the maximum gray value in the grey decision-making of all sub-pixels of described reftype; Determine the second grey decision-making according to described first grey decision-making, described second grey decision-making is more than or equal to described first grey decision-making; Drive and continue to work until the corresponding reference make-up time with reference to sub-pixel, and close the sub-pixel that grey decision-making equals described second grey decision-making, wherein, described is the sub-pixel that arbitrary grey decision-making of described reftype is less than described second grey decision-making with reference to sub-pixel, and described is time of the described continuous firing with reference to sub-pixel with reference to the make-up time.
In addition, the embodiment of the present application additionally provides a kind of system eliminating still image viewing area ghost defect, be applied to self-emission display apparatus, but described still image viewing area comprises the sub-pixel of at least two different grey decision-making of the same type, native system comprises as follows: the first GTG acquisition module, for obtaining the first grey decision-making of the sub-pixel of reftype corresponding to described still image viewing area, described reftype is any one in RGB type, and described first grey decision-making is the maximum gray value in the grey decision-making of all sub-pixels of described reftype; Second GTG acquisition module, for determining the second grey decision-making according to described first grey decision-making, described second grey decision-making is more than or equal to described first grey decision-making; Driver module, the corresponding reference make-up time is continueed to work until with reference to sub-pixel for driving, and close the sub-pixel that grey decision-making equals described second grey decision-making, wherein, described is the sub-pixel that arbitrary grey decision-making of described reftype is less than described second grey decision-making with reference to sub-pixel, and described is time of the described continuous firing with reference to sub-pixel with reference to the make-up time.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
The second grey decision-making of reftype sub-pixel is obtained according to the first grey decision-making of still image reftype sub-pixel, wherein, second grey decision-making is more than or equal to described first grey decision-making, then the sub-pixel driving grey decision-making in reftype to be less than described second grey decision-making continues to work until the corresponding reference make-up time, and close the sub-pixel that grey decision-making equals described second grey decision-making, like this, for the sub-pixel of reftype and type of pixel of the same race, because the second grey decision-making is more than or equal to the first grey decision-making, therefore, drive the sub-pixel continuous firing that grey decision-making is less than the second grey decision-making, be equivalent to carry out aging to this sub pixel, the grey decision-making of the sub-pixel point of low GTG is made to continue decay, and the grey decision-making sub-pixel equal with the second grey decision-making is closed, do not need to compensate it, namely continuous firing is not needed to carry out aging, and different sub-pixels has the reference make-up time of its correspondence, just need not compensate again after the reference make-up time of oneself correspondence of sub-pixel arrival of continuous firing, namely can work on, until the reference make-up time that all sub-pixels are corresponding all on earth, in this way, the GTG difference in attenuation between sub-pixel of the same type can be made to reduce, the GTG attenuation ratio between the sub-pixel of identical type in still image point can be made to reach unanimity gradually, utilize the ghost eliminated display screen and occur.
Accompanying drawing explanation
Fig. 1 is the brightness decay schematic diagram in time of the application's prior art sub-pixel;
Fig. 2 is the method flow schematic diagram eliminating ghost defect in the embodiment of the present application;
Fig. 3 is the method flow schematic diagram obtaining the first grey decision-making in the embodiment of the present application;
Fig. 4 is the method flow schematic diagram judging still image in the embodiment of the present application;
Fig. 5 is wherein a kind of method flow schematic diagram determining the make-up time in the embodiment of the present application;
Fig. 6 is the method flow schematic diagram that in the embodiment of the present application, another determines the make-up time;
Fig. 7 is the system module schematic diagram eliminating ghost defect in the embodiment of the present application;
Fig. 8 is the schematic diagram of the first grey decision-making acquisition module in the embodiment of the present application;
Fig. 9 is the system module schematic diagram judging still image in the embodiment of the present application;
Figure 10 is the embodiment of the present application wherein a kind of system module schematic diagram determining the make-up time;
Figure 11 be the embodiment of the present application another determine the system module schematic diagram of make-up time.
Embodiment
The embodiment of the present application is by providing a kind of method and system eliminating still image viewing area ghost defect, solve in prior art by reducing the brightness of each sub-pixel, sub-pixel is made to be in low-light level work, reduce the difference of the attenuation ratio between sub-pixel but really cannot eliminate the ghost problem that still image viewing area occurs, if enable still image viewing area occur, ghost problem is eliminated.
Technical scheme in the embodiment of the present application is the problem solving above-mentioned elimination still image viewing area ghost defect, and general thought is as follows:
Due to the main cause of ghost defect be identical type sub-pixel between cause because the brightness decay size in the inconsistent thus procedure for displaying of display brightness is also different, this programme carries out temporal compensation by sub-pixel point grey decision-making being less than to the second grey decision-making, enable these pixel continuous firing accelerated deteriorations, and grey decision-making is equaled to the sub-pixel closedown of the second grey decision-making, and then the size making the GTG between sub-pixel of the same type decay reaches unanimity gradually, the brightness decay difference between the sub-pixel of identical type is so just made to reduce gradually, and then the ghost of tableaux is disappeared.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
As shown in Figure 2, the invention provides a kind of method eliminating still image viewing area ghost defect, be applied to self-emission display apparatus, but still image viewing area comprises the sub-pixel of at least two different grey decision-making of the same type, this method comprises the steps:
S1: the first grey decision-making obtaining the sub-pixel of reftype corresponding to described still image viewing area, described reftype is any one in RGB type, and described first grey decision-making is the maximum gray value in the grey decision-making of all sub-pixels of described reftype;
In this step, correspondence determines still image, can be whole viewing areas of self-emission display apparatus, as TV display monochrome image or single image, also can be the part viewing area of self-emission display apparatus, for part viewing area, as in self-emission display apparatus, concrete, it can be the television image of television for play, as the station symbol CCTV-1 of the Chinese Central Television (CCTV) 1 channel, other viewing areas can be dynamic images, but the viewing area of station symbol shows CCTV-1 all the time, therefore can judge the viewing area display that this station symbol part is corresponding as still image.
Current various types of display device is mostly adopt RGB color standard, and RGB colour display system is by obtaining color miscellaneous to the change of red (R), green (G), blue (B) three color sub-pixels and their superpositions each other, namely RGB is the color representing red, green, blue three sub-pixel, this standard almost include human eyesight can all colours of perception, be use the widest color system at present.
The sub-pixel of reftype is the sub-pixel of any one type in RGB type, for red sub-pixel, can by obtaining the grey decision-making of each red sub-pixel in all red sub-pixel in still image, find out the maximum gray value in these grey decision-making, this maximum gray value is the first grey decision-making.
Example, the sub-pixel of red type has 5, the grey decision-making of these five red sub-pixel is respectively 255 GTGs, 200 GTGs, 180 GTGs, 150 GTGs and 100 GTGs, and because 255 GTGs are the maximal value in the grey decision-making of red sub-pixel, so known first grey decision-making is 255 GTGs.
For the acquisition methods of grey decision-making; can obtain by carrying out decoding to display; or by measuring drive current or driving voltage etc.; these GTG acquisition methods are all based on prior art; it not the emphasis of this programme; therefore repeat no more, as long as the existing method of the grey decision-making of sub-pixel can be obtained, all within the protection domain of this programme.
In actual applications, because the quantity of display device sub-pixel point is very huge, for reducing the calculated amount of grey decision-making, self-emission display apparatus can be divided into N number of region according to display brightness, N be more than or equal to 2 integer, in each region, the average gray-scale value of the sub-pixel of a certain type is as calculating object, calculating data can be reduced further, improve compensation efficiency, concrete, as shown in Figure 3, step is as follows:
M1: described still image is divided into N number of region by the brightness step according to described still image, in described N number of region, each region comprises the sub-pixel of the identical type of at least one, N be more than or equal to 2 integer;
In the prior art, divide mainly based on Image Edge-Detection to display image with brightness step, identify brightness of image and change obvious sub-pixel point, the sub-pixel point of difference in certain threshold range that be brightness is identical or brightness is divided into a region, significantly can reduce the treatment capacity of data.
Certainly, also can judge according to naked eyes, the comparatively similar display section of brightness can be divided into a region, like this with certain error, certain impact can be brought to final ghost defect, but under the prerequisite not considering perfect elimination ghost defect, can divide viewing area fast.
Example, viewing area corresponding for still image is divided into 9 regions by the brightness step according to still image, is respectively F1, F2, F3, F4, F5, F6, F7, F8 and F9, as shown in table 1.
Table 1
| F1 | F2 | F3 |
| F4 | F5 | F6 |
| F7 | F8 | F9 |
In these nine regions, each region comprises at least one red sub-pixel.
M2: the average gray-scale value obtaining the sub-pixel of the identical type in each region, described N number of region;
Corresponding to red sub-pixel, because each region comprises at least one red sub-pixel, example, as processed the red sub-pixel in F1 region, several sampled point can be got, obtain the grey decision-making of the red sub-pixel of sampled point, and then ask for the mean value of F1 Regional Red sub-pixel, this mean value can as the grey decision-making of red sub-pixel each in F1 region, the like, the average gray-scale value of the red sub-pixel in these 9 regions can be obtained, as shown in table 2:
Table 2
| 80 | 83 | 87 |
| 90 | 100 | 94 |
| 85 | 93 | 95 |
M3: the average gray-scale value according to the sub-pixel of the identical type in described each region obtains described first grey decision-making, and described first grey decision-making is the maximum average gray-scale value in the average gray-scale value of described identical type sub-pixel.
Example, according to the average gray-scale value of the red sub-pixel in each region in 9 regions in table 2, wherein maximal value is the red sub-pixel in former F5 region, and its average gray-scale value is 100, and therefore the size of the first grey decision-making is also 100.
S2: determine the second grey decision-making according to described first grey decision-making, described second grey decision-making is more than or equal to described first grey decision-making;
The size of the second grey decision-making can freely define, as long as ensure to be more than or equal to the first grey decision-making, in the example of step S1, from the grey decision-making of five red sub-pixel corresponding to still image, the size of the first grey decision-making is 255, for general image display signal, the scope of grey decision-making is in 0 ~ 255 GTG, and therefore the second grey decision-making can only be 255.
If the size of the first grey decision-making is 100, so the second grey decision-making scope can in the grey-scale range of 100 ~ 255 value.
Example, in this step, the size that can define the second grey decision-making is 255.
S3: drive and continue to work until the corresponding reference make-up time with reference to sub-pixel, and close the sub-pixel that grey decision-making equals described second grey decision-making, wherein, described is the sub-pixel that arbitrary grey decision-making of described reftype is less than described second grey decision-making with reference to sub-pixel, and described is time of the described continuous firing with reference to sub-pixel with reference to the make-up time.
Example, for five red sub-pixel that still image is corresponding, the grey decision-making of five red sub-pixel is respectively 255 GTGs, 200 GTGs, 180 GTGs, 150 GTGs and 100 GTGs, size due to the second grey decision-making is 255 GTGs, so for the red sub-pixel of 200 GTGs, 180 GTGs, 150 GTGs and 100 GTGs, need to drive these red sub-pixel continuous firings, the red sub-pixel for 255 GTGs is then closed and is not processed.
The sub-pixel that the sub-pixel continuous firing driving grey decision-making in reftype to be less than described second grey decision-making can be less than the second grey decision-making to grey decision-making with the former grey decision-making of this sub-pixel or improve this sub-pixel grey decision-making GTG to the second grey decision-making and continuous firing ensure that this sub-pixel proceeds work, namely aging further, example, the red sub-pixel of former 255 GTGs after a period of operation, its gray-scale intensity decays to 205 GTGs, namely after display L duration, the red sub-pixel of 255 GTGs has decayed 50 GTGs, and after the sub-pixel work L duration of the redness of 200 GTGs, gray-scale intensity becomes 170 GTGs, only to decay 30 GTGs, the sub-pixel comparing former 255 GTGs is decayed 50 GTGs, the grey decision-making that after former 200 GTGs also need continuation decay to get over 20 GTGs, ability and former 255 GTGs are decayed is equal, therefore the red sub-pixel of former 200 GTGs can be continued with 200 GTG work or its gray-scale intensity is brought up to 255 GTGs, its continuous firing is allowed to accelerate decay until the reference make-up time of correspondence, as early as possible 20 gray-scale intensity of difference are decayed, the sub-pixel of former 255 GTGs is then closed and no longer works, like this, the red sub-pixel of former 255 GTGs is just identical with the grey decision-making damping capacity of the red sub-pixel of former 200 GTGs, for the reference make-up time, also must ensure that the sub-pixel of low GTG is identical with the brightness decay value of the sub-pixel of high gray, as long as the difference both controlling is in the sightless threshold value of discernable by eye ability, the like, this is all taked to operate to all red sub-pixel, each sub-pixel is decayed roughly the same grey decision-making, and corresponding green sub-pixels and blue subpixels also all take corresponding step to carry out accelerated deterioration, and then ensure that ghost can be eliminated.
Preferably, as Fig. 4, in step S1: also comprise the steps: before obtaining the step of the first grey decision-making of the sub-pixel of reftype corresponding to still image viewing area
N1: before and after the viewing area that more described still image is corresponding, whether frame image signal is variant;
N2: if nothing, then judge described viewing area display still image.
When determining whether still image, can be whether variant by comparing front and back frame image signal value, if indifference, then can judge this viewing area correspondence display still image.
Preferably, as wherein a kind of embodiment, if the second grey decision-making equals the first grey decision-making, step S3 specifically comprises the steps, as shown in Figure 5:
P1: obtain the display duration of described still image and the grey decision-making of the first reference sub-pixel, described first reference sub-pixel is arbitrary sub-pixel that in described reftype, grey decision-making is less than described second grey decision-making, and described second grey decision-making equals described first grey decision-making;
Comprise two steps in this step, one is the continuous working duration by time set statistical static image, and another obtains grey decision-making in reftype to be less than the grey decision-making of each sub-pixel of the second grey decision-making; The front and back of these two steps are interchangeable, do not affect net result.
Such as, to five red sub-pixel mentioned in embodiment part before, the grey decision-making of 200 GTGs, 180 GTGs, 150 GTGs and 100 these red sub-pixel of GTG can be added up.
P2: according to formula (1), obtain first of the first reference sub-pixel with reference to the make-up time, described formula (1) is
wherein T
ibe the first reference make-up time of the first reference sub-pixel, L is described display duration,
for the grey decision-making of described first reference sub-pixel,
for described second grey decision-making, γ is constant, and n is the described damped expoential with reference to sub-pixel;
Example, for 200 GTGs, 180 GTGs, 150 GTGs and these red sub-pixel of 100 GTGs, because the first grey decision-making and the second grey decision-making are 200 GTGs, according to formula (1), the first reference make-up time that these three red sub-pixel of 180 GTGs, 150 GTGs and 100 GTGs are corresponding respectively can be obtained.
The derivation of formula (1) is as follows:
In the prior art, for self-emission display apparatus and OLED display device, for the sub-pixel of a type, there is the funtcional relationship of brightness and GTG in it:
--formula (3), wherein, in formula (3), when OLED is operated under different GTGs, as Gray
1and Gray
2, its brightness corresponding is respectively L
1and L
2, r is Gamma numerical value, is generally constant 2.2.
In addition, for the sub-pixel of a type, also there is the funtcional relationship of brightness and die-away time:
--formula (4), wherein, in formula (4), the brightness that same sub-pixel is corresponding different, L
1and L
2be respectively brightness number, its die-away time is inversely proportional to, and is respectively T
2and T
1, the damped expoential of n type sub-pixel for this reason, be also general knowledge, it should be explicitly made clear at this point, for the sub-pixel of different colours type, the size of damped expoential n is also different;
Therefore according to formula (3) and formula (4), can derive and draw
and then derivation obtains
--formula (5), its implication is, if OLED is at GTG
in time, has worked duration
in order to ensure GTG Gray
1and Gray
2there is identical GTG pad value, so other
operating time must extend to
namely
To sum up, by the process of deriving above, namely finally analogy formula (1) can be obtained by formula (3) and (4) and (5):
Therefore according to formula (1), example, the first reference make-up time that these three red sub-pixel of 180 GTGs, 150 GTGs and 100 GTGs are corresponding respectively can be got, the like, the sub-pixel of each type is all operated by this, finally obtain each sub-pixel corresponding make-up time in viewing area corresponding to still image, wherein, make-up time of the sub-pixel that grey decision-making is higher can be lower than grey decision-making make-up time of sub-pixel short, this and grey decision-making are higher, decay more relevant.
P3: drive described first reference sub-pixel to be the described first reference make-up time with the duration of the grey decision-making continuous firing of described first reference sub-pixel, and close the sub-pixel that grey decision-making equals described second grey decision-making.
First is arrived with reference to after the make-up time when the time of the continuous firing of the first reference sub-pixel, also just mean that this sub-pixel does not need to compensate for again, now, closing sub-pixel makes it work again, after waiting for after closing that other sub-pixels all arrive the corresponding make-up time, totally open all sub-pixels again, carry out the display of follow-up next frame image.
In actual product, the mode of this elimination ghost defect can after self-emission display apparatus display reaches scheduled duration, enforceable ghost defect to be eliminated, also user can be given initiative, if user finds to occur ghost on television, the function choosing-item eliminating ghost can be started, process is carried out to the ghost of self-emission display apparatus and eliminates.
Preferably, alternatively effective embodiment, as shown in Figure 6, step S3 specifically comprises the steps:
Q1: obtain the display duration of described still image and the grey decision-making of the second reference sub-pixel, described second reference sub-pixel is arbitrary sub-pixel that in described reftype, grey decision-making is less than described second grey decision-making, and described second grey decision-making is more than or equal to described first grey decision-making;
Similar with P1 step, also comprise two little steps in this step, one is the continuous working duration by time set statistical static image, and another obtains grey decision-making in reftype to be less than the grey decision-making of each sub-pixel of the second grey decision-making; The front and back of these two steps are interchangeable, do not affect net result.
Such as, to five red sub-pixel mentioned in embodiment before, the grey decision-making of 200 GTGs, 180 GTGs, 150 GTGs and 100 these red sub-pixel of GTG can be added up.
Q2: according to formula (2), obtain second of the second reference sub-pixel with reference to the make-up time, described formula (2) is
wherein T
kbe the second reference make-up time of the second reference sub-pixel, L is display duration,
for the grey decision-making of described second reference sub-pixel,
for described second grey decision-making, γ is constant, and n is the damped expoential of described second reference sub-pixel;
Similar with the derivation of formula (1), consider in practical application, if the sub-pixel point that grey decision-making is less wants that the sub-pixel point higher with grey decision-making keeps identical GTG attenuation ratio, so for the sub-pixel that grey decision-making is less, the time that its decay needs is longer, therefore when in the sub-pixel of red type, most high gray value is lower, work on although other grey decision-making are driven, but the time that its decay needs is very long, be difficult in practice be applied, therefore need to try every possible means to shorten the make-up time.Can the grey decision-making assignment of each sub-pixel to the first grey decision-making or the grey decision-making higher than the first grey decision-making, example, if have four green sub-pixels in still image at present, the grey decision-making of these four green sub-pixels is respectively 70,60,30,20, so for the green sub-pixels of these lower grey decision-making, wherein maximum grey decision-making ability 70, so setting the second grey decision-making is 255 GTGs, the grey decision-making of four green sub-pixels is allowed to bring up to 255 GTGs, accelerate decay with 255 GTGs, the GTG pad value of expectation can be reached fast.
Wherein, the derivation of this make-up time is as follows:
--formula (6)
Analogy following formula (2) can be gone out according to formula (6)
Therefore according to formula (2), the second reference make-up time that four green sub-pixels are corresponding respectively can be got, the like, the sub-pixel of each type is all operated by this, finally obtains each sub-pixel corresponding make-up time in viewing area corresponding to still image.
It should be noted that, for 0 GTG sub-pixel, due in procedure for displaying, 0 GTG can not continue decay again, therefore for the sub-pixel of 0 GTG, needs special processing,
First the maximum gray value of all sub-pixels got in type of pixel corresponding to 0 GTG sub-pixel is needed.
By 0 GTG sub-pixel indirect assignment to this maximum gray value, then continuous firing, the duration of its continuous firing is made to be still image display duration.
Be equivalent to carry out an inverse process to 0 GTG sub-pixel and the sub-pixel of most high gray, make 0 GTG sub-pixel with most high gray value accelerated deterioration, the operating time of the sub-pixel that the aging time is corresponding with most high gray is equal.
Q3: drive described second with reference to sub-pixel with the second grey decision-making continuous firing, and the duration of described continuous firing is the described second reference make-up time, and close the sub-pixel that grey decision-making equals described second grey decision-making.
Second is arrived with reference to after the make-up time when the time of the continuous firing of each second reference sub-pixel, also just mean that this sub-pixel does not need to compensate for again, now, closing sub-pixel makes it work again, after waiting for after closing that other sub-pixels all arrive the second corresponding make-up time, totally open all sub-pixels again, carry out the display of follow-up next frame image.
Based on above embodiment, the second grey decision-making of reftype sub-pixel is obtained according to the first grey decision-making of still image reftype sub-pixel, wherein, second grey decision-making is more than or equal to described first grey decision-making, then the sub-pixel driving grey decision-making in reftype to be less than described second grey decision-making continues to work until the corresponding reference make-up time, and close the sub-pixel that grey decision-making equals described second grey decision-making, like this, for the sub-pixel of reftype and type of pixel of the same race, because the second grey decision-making is more than or equal to the first grey decision-making, therefore, drive the sub-pixel continuous firing that grey decision-making is less than the second grey decision-making, be equivalent to carry out aging to this sub pixel, the grey decision-making of the sub-pixel point of low GTG is made to continue decay, and the grey decision-making sub-pixel equal with the second grey decision-making is closed, do not need to compensate it, namely continuous firing is not needed to carry out aging, and different sub-pixels has the reference make-up time of its correspondence, just need not compensate again after the reference make-up time of oneself correspondence of sub-pixel arrival of continuous firing, namely can work on, until the reference make-up time that all sub-pixels are corresponding all on earth, in this way, the GTG difference in attenuation between sub-pixel of the same type can be made to reduce, the GTG attenuation ratio between the sub-pixel of identical type in still image point can be made to reach unanimity gradually, utilize the ghost eliminated display screen and occur.
Based on same inventive concept, this substantive examination embodiment still provides a kind of system eliminating still image viewing area ghost defect, be applied to self-emission display apparatus, but described still image viewing area comprises the sub-pixel of at least two different grey decision-making of the same type, described system comprises: the first GTG acquisition module, for obtaining the first grey decision-making of the sub-pixel of reftype corresponding to described still image viewing area, described reftype is any one in RGB type, described first grey decision-making is the maximum gray value in the grey decision-making of all sub-pixels of described reftype, second GTG acquisition module, for determining the second grey decision-making according to described first grey decision-making, described second grey decision-making is more than or equal to described first grey decision-making, driver module, the corresponding reference make-up time is continueed to work until with reference to sub-pixel for driving, and close the sub-pixel that grey decision-making equals described second grey decision-making, wherein, described is the sub-pixel that arbitrary grey decision-making of described reftype is less than described second grey decision-making with reference to sub-pixel, and described is time of the described continuous firing with reference to sub-pixel with reference to the make-up time.
The connected mode of native system is shown in Fig. 7, first GTG acquisition module is connected with the second GTG acquisition module, reference is carried out for the first grey decision-making of the sub-pixel getting reftype corresponding to still image is issued the second GTG acquisition module, second GTG acquisition module generates the second grey decision-making according to the first grey decision-making, driver module is connected with the second GTG acquisition module, sub-pixel for driving grey decision-making in described reftype to be not equal to described second grey decision-making continues to work until the corresponding reference make-up time, and close the sub-pixel that grey decision-making equals described second grey decision-making.
As one preferred embodiment, as Fig. 8, the first GTG acquisition module of native system also comprises following submodule:
Brightness divide submodule, for the brightness step according to described still image, described still image is divided into N number of region, in described N number of region, each region comprises the sub-pixel of the identical type of at least one, N be more than or equal to 2 integer; Average GTG calculating sub module, for obtaining the average gray-scale value of the sub-pixel of the identical type in each region, described N number of region; GTG obtains submodule, and the average gray-scale value for the sub-pixel according to the identical type in described each region obtains described first grey decision-making, and described first grey decision-making is the maximum average gray-scale value in the average gray-scale value of described identical type sub-pixel.
Whether, preferably, as Fig. 9, native system also comprises as lower module: comparison module, variant for frame image signal before and after the viewing area that comparative static image is corresponding; Judge module, for before and after described viewing area during frame image signal indifference, judging/displaying device display still image.
Preferably, as Figure 10, native system also comprises as lower module: the first display duration acquisition module, for obtaining the display duration of described still image; First sub-pixel GTG acquisition module, for obtaining the grey decision-making of the first reference sub-pixel, described first reference sub-pixel is arbitrary sub-pixel that in described reftype, grey decision-making is less than described second grey decision-making; First computing module, for according to formula (1), obtain first with reference to sub-pixel first with reference to the make-up time, described formula (1) is
wherein T
ibe the first reference make-up time of the first reference sub-pixel, L is described display duration,
for described with reference to the grey decision-making of sub-pixel,
for described second grey decision-making, γ is constant, and n is the described damped expoential with reference to sub-pixel;
First driver module, for driving described first to be described first with reference to make-up time with described first with reference to the duration of grey decision-making continuous firing of sub-pixel with reference to sub-pixel, and closes the sub-pixel that grey decision-making equals described second grey decision-making.
Preferably, alternatively preferred embodiment, as Figure 11, native system also comprises as lower module: the second display duration acquisition module, for obtaining the display duration of described still image; Second sub-pixel GTG acquisition module, for obtaining the grey decision-making of the second reference sub-pixel, described second reference sub-pixel is arbitrary sub-pixel that in described reftype, grey decision-making is less than described second grey decision-making; Second computing module, for according to formula (2), obtain second with reference to sub-pixel second with reference to the make-up time, described formula (2) is
wherein T
kbe the second reference make-up time of the second reference sub-pixel, L is described display duration,
for the grey decision-making of described second reference sub-pixel,
for described second grey decision-making, γ is constant, and n is the damped expoential of described second reference sub-pixel; Second driver module, for for driving described second with reference to sub-pixel with the second grey decision-making continuous firing, and the duration of described continuous firing is described second with reference to the make-up time, and closes the sub-pixel that grey decision-making equals described second grey decision-making.
Based on above embodiment, the second grey decision-making of reftype sub-pixel is obtained according to the first grey decision-making of still image reftype sub-pixel, wherein, second grey decision-making is more than or equal to described first grey decision-making, then the sub-pixel driving grey decision-making in reftype to be less than described second grey decision-making continues to work until the corresponding reference make-up time, and close the sub-pixel that grey decision-making equals described second grey decision-making, like this, for the sub-pixel of reftype and type of pixel of the same race, because the second grey decision-making is more than or equal to the first grey decision-making, therefore, drive the sub-pixel continuous firing that grey decision-making is less than the second grey decision-making, be equivalent to carry out aging to this sub pixel, the grey decision-making of the sub-pixel point of low GTG is made to continue decay, and the grey decision-making sub-pixel equal with the second grey decision-making is closed, do not need to compensate it, namely continuous firing is not needed to carry out aging, and different sub-pixels has the reference make-up time of its correspondence, just need not compensate again after the reference make-up time of oneself correspondence of sub-pixel arrival of continuous firing, namely can work on, until the reference make-up time that all sub-pixels are corresponding all on earth, in this way, the GTG difference in attenuation between sub-pixel of the same type can be made to reduce, the GTG attenuation ratio between the sub-pixel of identical type in still image point can be made to reach unanimity gradually, utilize the ghost eliminated display screen and occur.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the process flow diagram of the method for the embodiment of the present invention, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and process flow diagram and/or block scheme and/or square frame.These computer program instructions can being provided to the processor of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computing machine or other programmable data processing device produce device for realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. eliminate a method for still image viewing area ghost defect, be applied to self-emission display apparatus, but described still image viewing area comprises the sub-pixel of at least two different grey decision-making of the same type, it is characterized in that, described method comprises:
Obtain the first grey decision-making of the sub-pixel of reftype corresponding to described still image viewing area, described reftype is any one in RGB type, and described first grey decision-making is the maximum gray value in the grey decision-making of all sub-pixels of described reftype;
Determine the second grey decision-making according to described first grey decision-making, described second grey decision-making is more than or equal to described first grey decision-making;
Drive and continue to work until the corresponding reference make-up time with reference to sub-pixel, and close the sub-pixel that grey decision-making equals described second grey decision-making, wherein, described is the sub-pixel that arbitrary grey decision-making of described reftype is less than described second grey decision-making with reference to sub-pixel, and described is time of the described continuous firing with reference to sub-pixel with reference to the make-up time.
2. the method eliminating still image viewing area ghost defect as claimed in claim 1, it is characterized in that, the step of the first grey decision-making of the sub-pixel of the reftype that described acquisition described still image viewing area is corresponding is specially:
Described still image is divided into N number of region by the brightness step according to described still image, and in described N number of region, each region comprises the sub-pixel of the identical type of at least one, N be more than or equal to 2 integer;
Obtain the average gray-scale value of the sub-pixel of the identical type in each region, described N number of region;
Average gray-scale value according to the sub-pixel of the identical type in described each region obtains described first grey decision-making, and described first grey decision-making is the maximum average gray-scale value in the average gray-scale value of described identical type sub-pixel.
3. the as claimed in claim 2 method eliminating still image viewing area ghost defect, is characterized in that, also comprises the steps: before the step of the first grey decision-making of the sub-pixel of reftype corresponding to described acquisition described still image viewing area
Before and after the viewing area that more described still image is corresponding, whether frame image signal is variant;
If nothing, then judge described viewing area display still image.
4. the method eliminating still image viewing area ghost defect as claimed in claim 3, is characterized in that,
Described driving continues to work until the corresponding reference make-up time with reference to sub-pixel, and the step that closedown grey decision-making equals the sub-pixel of described second grey decision-making is specially:
Obtain the display duration of described still image and the grey decision-making of the first reference sub-pixel, described first reference sub-pixel is arbitrary sub-pixel that in described reftype, grey decision-making is less than described second grey decision-making, and described second grey decision-making equals described first grey decision-making;
According to formula (1), obtain the first make-up time of described first reference sub-pixel, described formula (1) is
wherein T
ifor the first make-up time of described first reference sub-pixel, L is described display duration,
for the grey decision-making of described first reference sub-pixel,
for described second grey decision-making, γ is constant, and n is the damped expoential of described first reference sub-pixel;
Drive described first reference sub-pixel to be the described first reference make-up time with the duration of the grey decision-making continuous firing of described first reference sub-pixel, and close the sub-pixel that grey decision-making equals described second grey decision-making.
5. the method eliminating still image viewing area ghost defect as claimed in claim 3, is characterized in that,
Described driving is described continues to work until the corresponding reference make-up time with reference to sub-pixel, and the step that closedown grey decision-making equals the sub-pixel of described second grey decision-making is specially:
Obtain the display duration of described still image and the grey decision-making of the second reference sub-pixel, described second reference sub-pixel is arbitrary sub-pixel that in described reftype, grey decision-making is less than described second grey decision-making, and described second grey decision-making is more than or equal to described first grey decision-making;
According to formula (2), obtain second of described second reference sub-pixel with reference to the make-up time, described formula (2) is
wherein T
kfor the second reference make-up time of described second reference sub-pixel, L is described display duration,
for the grey decision-making of described second reference sub-pixel,
for described second grey decision-making, γ is constant, and n is the damped expoential of described second reference sub-pixel;
Drive described second with reference to sub-pixel with the second grey decision-making continuous firing, and the duration of described continuous firing is the described second reference make-up time, and closes the sub-pixel that grey decision-making equals described second grey decision-making.
6. eliminate a system for still image viewing area ghost defect, be applied to self-emission display apparatus, but described still image viewing area comprises the sub-pixel of at least two different grey decision-making of the same type, it is characterized in that, described system comprises:
First GTG acquisition module, for obtaining the first grey decision-making of the sub-pixel of reftype corresponding to described still image viewing area, described reftype is any one in RGB type, and described first grey decision-making is the maximum gray value in the grey decision-making of all sub-pixels of described reftype;
Second GTG acquisition module, for determining the second grey decision-making according to described first grey decision-making, described second grey decision-making is more than or equal to described first grey decision-making;
Driver module, the corresponding reference make-up time is continueed to work until with reference to sub-pixel for driving, and close the sub-pixel that grey decision-making equals described second grey decision-making, wherein, described is the sub-pixel that arbitrary grey decision-making of described reftype is less than described second grey decision-making with reference to sub-pixel, and described is time of the described continuous firing with reference to sub-pixel with reference to the make-up time.
7. the system eliminating still image viewing area ghost defect as claimed in claim 6, it is characterized in that, described first GTG acquisition module also comprises following submodule:
Brightness divide submodule, for the brightness step according to described still image, described still image is divided into N number of region, in described N number of region, each region comprises the sub-pixel of the identical type of at least one, N be more than or equal to 2 integer;
Average GTG calculating sub module, for obtaining the average gray-scale value of the sub-pixel of the identical type in each region, described N number of region;
GTG obtains submodule, and the average gray-scale value for the sub-pixel according to the identical type in described each region obtains described first grey decision-making, and described first grey decision-making is the maximum average gray-scale value in the average gray-scale value of described identical type sub-pixel.
8. the system eliminating still image viewing area ghost defect as claimed in claim 7, it is characterized in that, described system also comprises as lower module:
Comparison module, whether variant for frame image signal before and after the viewing area that more described still image is corresponding;
Judge module, for during frame image signal indifference, judging described display device display still image before and after described viewing area.
9. the method eliminating still image viewing area ghost defect as claimed in claim 8, it is characterized in that, described system also comprises as lower module:
First display duration acquisition module, for obtaining the display duration of described still image;
First sub-pixel GTG acquisition module, for obtaining the grey decision-making of the first reference sub-pixel, described first reference sub-pixel is arbitrary sub-pixel that in described reftype, grey decision-making is less than described second grey decision-making, and described second grey decision-making equals described first grey decision-making;
First computing module, for according to formula (1), obtain first with reference to sub-pixel first with reference to the make-up time, described formula (1) is
wherein T
ifor the first reference make-up time of described first reference sub-pixel, L is described display duration,
for the grey decision-making of described first reference sub-pixel,
for described second grey decision-making, γ is constant, and n is the damped expoential of described first reference sub-pixel;
First driver module, drives described first reference sub-pixel to be the described first reference make-up time with the duration of the grey decision-making continuous firing of described first reference sub-pixel, and closes the sub-pixel that grey decision-making equals described second grey decision-making.
10. the method eliminating still image viewing area ghost defect as claimed in claim 8, it is characterized in that, described system also comprises as lower module:
Second display duration acquisition module, for obtaining the display duration of described still image;
Second sub-pixel GTG acquisition module, for obtaining the grey decision-making of the second reference sub-pixel, described second reference sub-pixel is arbitrary sub-pixel that in described reftype, grey decision-making is less than described second grey decision-making, and described second grey decision-making is more than or equal to described first grey decision-making;
Second computing module, for according to formula (2), obtain described second with reference to sub-pixel second with reference to the make-up time, described formula (2) is
wherein T
kfor the second reference make-up time of described second reference sub-pixel, L is described display duration,
for the grey decision-making of described second reference sub-pixel,
for described second grey decision-making, γ is constant, and n is the damped expoential of described second reference sub-pixel;
Second driver module, for driving described second with reference to sub-pixel with the second grey decision-making continuous firing, and the duration of described continuous firing is the described second reference make-up time, and closes the sub-pixel that grey decision-making equals described second grey decision-making.
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