CN101950528B - Linear adjustment method of gray scales of PDP (Plasma Display Panel) - Google Patents
Linear adjustment method of gray scales of PDP (Plasma Display Panel) Download PDFInfo
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Abstract
The invention discloses a linear adjustment method of gray scales of a PDP (Plasma Display Panel), solving the problem of poor gray scale adjustment effect of a PDP in the prior art. The method comprises the following steps of: sorting the APL (Automatic Plasma Level) of the PDP in display into a plurality of APL groups according to a pulse number maintained by a low subfield; detecting the brightness value of each preset display gray scale of each APL group; and mapping the brightness value to a value between 0 and a maximum gray scale value. The technical scheme of the invention can ensure that the brightness displayed by the PDP is linearized and has favorable gray scale adjustment effect.
Description
Technical field
The present invention relates to the method for the linear adjustment of a kind of plasma display GTG.
Background technology
AC plasma adopts son to separate the display driver technology, and its GTG is that the son through variant weight is formed by stacking, and weight of each son is kept the umber of pulse decision by son.For example: in the field duration that one is made up of eight son fields, the umber of pulse of keeping of its son is roughly 1: 2: 4 according to a son to eight a sub ratio: 8: 16: 32: 64: 128.Its son weight is than then being so: 1: 2: 4: 8: 16: 32: 64: 128.Like gray-coded is 10001011 (left side is high son field), and then gray-scale value is 139, and gray-coded is 10001100, and then gray-scale value is 140, and on the theory, the brightness of gray-scale value 140 is higher than the brightness of gray-scale value 139.Yet the brightness results of actual test is then not necessarily so.Since the luminosity of AC plasma display except major part by the keeping the pulse decision of the phase of keeping, its erasing period although sweep time, luminosity was very little, thereby still exists faint luminosity to influence the luminosity of gray scale.Therefore, only consider to keep under the situation of pulse, certainly will cause its brightness value of the big gray scale of gray-scale value smaller on the contrary at theoretical gray-coded.Cause the GTG upset like this, influence the quality of display image.Erasing period and the luminosity of sweep time are because fainter simultaneously, and very difficult objective quantification has brought big difficulty for the adjustment of gray scale.In addition, though, nuance is arranged all because to keep its ratio value of umber of pulse roughly the same in different APL each son field down.Therefore the linear adjustment to GTG has increased difficulty under same cryptoprinciple.
Comprehensive above description can be found out, has the problem of PDP display GTG adjustment poor effect in the prior art, for this problem, does not propose effective solution at present as yet.
Summary of the invention
Fundamental purpose of the present invention is the method that proposes the linear adjustment of a kind of plasma display GTG, to solve the problem of PDP display GTG adjustment poor effect in the prior art.
For addressing the above problem, according to an aspect of the present invention, the method for the linear adjustment of a kind of plasma display GTG has been proposed.
The method of the linear adjustment of plasma display GTG of the present invention comprises: the automatic energy grade (APL) when keeping umber of pulse said PDP is shown according to low son field is divided into a plurality of APL groups; To each said APL group, detect the brightness value of each preset display gray scale; Said brightness value is mapped to 0 between the preset maximum gradation value.
Further, said display gray scale is gradation of image process Gamma correction and goes to obtain new gray-scale value behind the false contouring algorithm, this new gray-scale value carried out selecting of gray-coded according to gray scale centre code algorithm draw.
Further, with said brightness value map to 0 between maximum gradation value after, also comprise: with the linear expansion of display gray scale.
Further, after the linear expansion of display gray scale, also comprise: through image statistics APL value, confirm that the said APL under this APL value organizes, according to the display gray scale under this APL of correction as a result of the linear expansion of display gray scale in this APL group.
Further, the automatic energy grade (APL) when keeping umber of pulse said PDP is shown according to low son field is divided into a plurality of APL groups and comprises: keep the identical principle of umber of pulse according to preceding 2 or preceding 3 low sons, APL is divided into 5 to 10 groups.
Further; Said brightness value is mapped to 0 to comprising between the preset maximum gradation value according to following formula calculating GTG:
wherein; C representes the actual gray that calculates, the maximum gray scale of Q for being provided with.
Further, the linear expansion of display gray scale is comprised according to following formula calculating middle gray:
Wherein K representes the normalized value of blending ratio, K
MaxRepresent normalized maximal value.
According to technical scheme of the present invention; Keep the identical or similar principle of umber of pulse according to low son and classify through the son field of APL at different levels being kept umber of pulse; The son field of every type of APL keep under the umber of pulse distribution principle to each through Gamma correction with remove the false contouring algorithm after demonstration carry out luminance test with gray scale, be normalized to 0 to its brightness value between the maximum gray scale, be the actual gray value of this display gray scale; Therefore; Corresponding different actual gray value under different APL sorts out, each keeps the umber of pulse classification down corresponding to an adjustment gamma line, obtains the result of the linear adjustment of gray scale through many gamma line adjustment.Therefore technical scheme of the present invention makes linearization of brightness that PDP shows has the effect of GTG adjustment preferably.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the arrangenent diagram according to the system of the method for the linear adjustment of plasma display GTG of the embodiment of the invention;
Fig. 2 is the process flow diagram according to the key step of the method for the linear adjustment of plasma display GTG of the embodiment of the invention;
Fig. 3 is the synoptic diagram according to the corresponding different tone correcting curve of the grouping of the different APL of the embodiment of the invention; And
Fig. 4 is the wall scroll tone correcting curve according to this bright embodiment.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
Fig. 1 is the arrangenent diagram according to the system of the method for the linear adjustment of plasma display GTG of the embodiment of the invention.As shown in Figure 1, this system mainly comprises AC plasma display 11, optical tester 14 and pop one's head in 12, and data processing centre (DPC) 13.Fig. 2 is the process flow diagram according to the key step of the method for the linear adjustment of plasma display GTG of the embodiment of the invention.As shown in Figure 2, the method for the linear adjustment of plasma display GTG of the embodiment of the invention mainly comprises the steps:
Step S21: the automatic energy grade (APL) when keeping umber of pulse PDP is shown according to low son is divided into a plurality of APL groups;
Step S22:, detect the brightness value of each preset display gray scale to each said APL group;
Step S23: said brightness value is mapped to 0 between the preset maximum gradation value.
Among the above-mentioned steps S21, specifically can keep the identical principle of umber of pulse, APL is divided into 5 to 10 groups according to preceding 2 or preceding 3 low sons.Display gray scale among the above-mentioned steps S22 can be gradation of image process Gamma correction and go to obtain new gray-scale value behind the false contouring algorithm, this new gray-scale value carried out selecting of gray-coded according to gray scale centre code algorithm draw.And after step S23, can the linear expansion of display gray scale can be made linear all gray scales that extend to of display gray scale like this.Next can pass through image statistics APL value, confirm that the said APL under this APL value organizes, the result of the linear expansion of display gray scale adjusts the display gray scale under this APL in organizing according to this APL.The adjustment here is actually carries out revisal to gray scale, has increased the middle gray scale of original gray scale, through carrying out the tone correcting of different gray scales adjustment curves under the different grouping, keeps linearization of gray scale under the pulse distribution situation thereby reach all.
In the concrete implementation procedure of the linear adjustment of GTG in the present embodiment, at first draw the mapping curve of GTG revisal, the expression that can carry out the GTG revisal then and carry out middle gray through the mixed ratio of front and back display gray scale.Gradation of image is 2.2 anti-Gamma correction processing through gamma value; Through obtaining new gray scale after gamma 2.2 corrections; New gray-scale value is carried out selecting of gray-coded according to gray scale centre code (gray center code) algorithm, pick out such as gray scale and be 46 and use gray scale as demonstration.Because showing this with gray scale, dither algorithm reappears all gray scales according to the dither algorithm principle as the benchmark gray scale.Therefore the adjustment of linearization of gray scale is attached most importance to 46 display gray scales.But different APL values, the distribution condition that Qi Zichang keeps umber of pulse is different, and it is different that therefore test obtains the brightness results meeting.The linear debugging of GTG that the present invention proposes is linearization of brightness that under all different APL situation, all reaches GTG.Consider that APL is different and keep the umber of pulse difference, it mainly influences linearization of low GTG, and the brightness of low GTG mainly distributes decision by the umber of pulse of keeping of low son, is divided into five to ten groups to APL so keep the identical or principle of similarity of umber of pulse according to low son field.In theory, divide into groups manyly so unreasonablely to think that the principle according to effect and hardware cost equilibrium of stock in the present embodiment is divided into five groups to APL.Under each group situation, the brightness value of test display gray scale, method of testing is following: at first test gray scale and be 0 brightness, obtain L
Min, the brightness that next tests maximum gray scale obtains L
Max, test the brightness value of each display gray scale then successively, obtain Lx, so it is normalized to 0 between the maximum gray.Formula is suc as formula shown in (1):
In the formula (1), C is the actual gray that calculates, and Q is a maximum gray scale; If the input GTG is 8bit, then Q is 255, if the input GTG is 10bit; Then Q is 1023, and each display gray scale then is its actual gray according to the gray-scale value that formula (1) calculates again through the brightness value that luminance test obtains.Therefore; Under specific APL divided into groups, each display gray scale all had the actual gray value that calculates, thereby constitutes the mapping curve of a GTG revisal; The grouping of five groups of APL so; The mapping curve of five GTG revisals is then arranged, and as shown in Figure 3, Fig. 3 is the synoptic diagram according to the corresponding different tone correcting curve of the grouping of the different APL of the embodiment of the invention.Owing to reappear all gray scales behind the display gray scale process dither algorithm through the selection of center gray-coded method; Thereby dither algorithm is according to the blending ratio expression middle gray of a previous display gray scale and a back gray scale; Such as previous display gray scale C (n-1), a back display gray scale C (n); If some gray scale Cx are between C (n-1), between the C (n).Be C (n-1)＜Cx＜C (n), C (n-1) so, the blending ratio of C (n) can be calculated according to formula (2):
In the formula (2), K is the normalized value of blending ratio, K
MaxBe normalized maximal value.If be normalized to 1, then k is the ratio value between 0 to 1, if be normalized to 0 to 63, and K then
MaxBe 63.Its ratio value K representes with 6 bits.The front and back gray scale of calculating ratio value is the gray scale before the revisal gray scale, and the actual displayed gray scale is the gray scale behind the tone correcting.This shows,, can reach linearization of the brightness adjustment of all gray scales through dither algorithm through linearization of the brightness adjustment of display gray scale.Input picture is searched the corresponding tone correcting curve that divides into groups through APL statistics back according to the APL value so.
Through behind the tone correcting, will obtain the gray scale of linearization, as shown in Figure 4, Fig. 4 is the wall scroll tone correcting curve according to this bright embodiment.Among Fig. 4, lines 41 (appear and be similar to broken line) are the grey scale curve before the revisal, and lines 42 (appear and be similar to straight line) are the grey scale curve after the revisal.
According to technical scheme of the present invention; Keep the identical or similar principle of umber of pulse according to low son and classify through the son field of APL at different levels being kept umber of pulse; The son field of every type of APL keep under the umber of pulse distribution principle to each through Gamma correction with remove the false contouring algorithm after demonstration carry out luminance test with gray scale, be normalized to 0 to its brightness value between the maximum gray scale, be the actual gray value of this display gray scale; Therefore; Corresponding different actual gray value under different APL sorts out, each keeps the umber of pulse classification down corresponding to an adjustment gamma line, obtains the result of the linear adjustment of gray scale through many gamma line adjustment.Therefore technical scheme of the present invention makes linearization of brightness that PDP shows has the effect of GTG adjustment preferably.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the method for the linear adjustment of a plasma display PDP GTG is characterized in that,
Comprise:
Automatic energy grade (APL) when keeping umber of pulse said PDP is shown according to low son field is divided into a plurality of APL groups;
To each said APL group, detect the brightness value of each preset display gray scale;
Said brightness value is mapped to 0 between the preset maximum gradation value.
2. method according to claim 1; It is characterized in that; Said display gray scale is gradation of image process Gamma correction and goes to obtain new gray-scale value behind the false contouring algorithm, this new gray-scale value carried out selecting of gray-coded according to gray scale centre code algorithm draw.
3. method according to claim 1 is characterized in that, with said brightness value map to 0 between maximum gradation value after, also comprise: with the linear expansion of display gray scale.
4. method according to claim 3; It is characterized in that, after the linear expansion of display gray scale, also comprise: through image statistics APL value; Confirm that the said APL under this APL value organizes, the result of the linear expansion of display gray scale adjusts the display gray scale under this APL in organizing according to this APL.
5. according to each described method in the claim 1 to 4; It is characterized in that; Automatic energy grade (APL) when keeping umber of pulse said PDP is shown according to low son field is divided into a plurality of APL groups and comprises: keep the identical principle of umber of pulse according to preceding 2 or preceding 3 low sons, APL is divided into 5 to 10 groups.
6. according to each described method in the claim 1 to 4, it is characterized in that, said brightness value mapped to 0 to comprising between the preset maximum gradation value according to following formula calculating GTG:
Wherein, C representes the actual gray that calculates, and the maximum gray scale of Q for being provided with tested the brightness value of each display gray scale successively, obtains L
x, the test gray scale is 0 brightness, obtains L
Min, test the brightness of maximum gray scale, obtain L
Max
7. according to each described method in the claim 1 to 4, it is characterized in that, the linear expansion of display gray scale comprised according to following formula calculate middle gray:
Wherein K representes the normalized value of blending ratio, K
MaxRepresent normalized maximal value, C
xThe expression middle gray is between C
(n-1), C
nBetween, C
(n-1)Represent previous display gray scale, C
nRepresent a back display gray scale.
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| CN1622154A (en) * | 2003-11-26 | 2005-06-01 | Lg电子株式会社 | Apparatus and method for processing gray scale in display device |
| CN1971683A (en) * | 2005-11-25 | 2007-05-30 | 帆宣系统科技股份有限公司 | Brightness compensation method of two-dimensional display |
| CN101021989A (en) * | 2006-02-16 | 2007-08-22 | 帆宣系统科技股份有限公司 | Plasma display image sear-relieving improvement method |
| CN101599245A (en) * | 2008-06-02 | 2009-12-09 | Lg电子株式会社 | Plasma display system and driving method thereof |
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| CN1622154A (en) * | 2003-11-26 | 2005-06-01 | Lg电子株式会社 | Apparatus and method for processing gray scale in display device |
| CN1971683A (en) * | 2005-11-25 | 2007-05-30 | 帆宣系统科技股份有限公司 | Brightness compensation method of two-dimensional display |
| CN101021989A (en) * | 2006-02-16 | 2007-08-22 | 帆宣系统科技股份有限公司 | Plasma display image sear-relieving improvement method |
| CN101599245A (en) * | 2008-06-02 | 2009-12-09 | Lg电子株式会社 | Plasma display system and driving method thereof |
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