CN101667418A - Method for displaying luminance compensation of display screen and system thereof - Google Patents

Method for displaying luminance compensation of display screen and system thereof Download PDF

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Publication number
CN101667418A
CN101667418A CN200910190733A CN200910190733A CN101667418A CN 101667418 A CN101667418 A CN 101667418A CN 200910190733 A CN200910190733 A CN 200910190733A CN 200910190733 A CN200910190733 A CN 200910190733A CN 101667418 A CN101667418 A CN 101667418A
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display screen
area
brightness value
compensation
brightness
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CN101667418B (en
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刘萍
欧朋
杨刚
陈文彬
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Shenzhen Danbang Investment Group Co Ltd
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Shenzhen Danbang Investment Group Co Ltd
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Abstract

The invention provides a method for displaying luminance compensation of a display screen and a system thereof. The display screen is divided into a plurality of displaying regions, and a specific position in each displaying region is a sampling region; and the system comprises a sampling device for collecting luminance values of the sampling regions, a compensating device for providing specific compensating current for the displaying regions respectively and for obtaining corresponding compensating luminance values by controlling the time of compensating current, and a compensation control device for controlling the compensating device to compensate luminance of pixel points in different displaying regions respectively according to the received luminance values of the sampling regions obtained by the sampling device, thus leading to uniform displaying luminance of the display screen.

Description

A kind of method of displaying luminance compensation of display screen and system thereof
Technical field
The present invention relates to a kind of method and system thereof of displaying luminance compensation of display screen, relate in particular to a kind of method and system thereof large-sized OLED displaying luminance compensation of display screen.
Background technology
OLED (Organic Light Emitting Diode, Chinese for Organic Light Emitting Diode) display screen because have active illuminating, brightness height, contrast height, gently approach, angle of visibility reaches advantages such as reaction velocity is fast greatly, received concern widely.If display has any flaw point,, the display picture quality is descended as problems such as bright spot, dim spot, brightness irregularities.The brightness irregularities phenomenon is with the distortion that causes when watching.The irregularity in brightness problem of oled panel existence has at present had a strong impact on it in the competitive strength that shows on the market.Irregularity in brightness problem for this reason, many researchers adopt a series of measures from technology, have gone out some schemes as many researchers from being designed into of element circuit is portable.But only start with the basic not basic irregularity in brightness problem that solves from the production technology of display screen.
To this, some researchers start with from panel detection, have proposed certain methods.Pointwise detection method and one-dimensional linear method of interpolation are wherein typically arranged.
The pointwise detection method is: the brightness value that pointwise detects each pixel of display screen, carry out luminance compensation then in view of the above respectively.The compensation effect of pointwise detection method theoretically, is optimum.But this mode is used in small-size screen just has possibility, and for middle screen display or large screen display, it is unpractical that pointwise detects rule.This is that its number of pixels is too huge because when screen is bigger, uses the pointwise detection method need expend a large amount of hardware resources, and manufacturing cost also can be high.In addition, because the resolution characteristic of nitometer is limited, in actual applications, also be difficult to adopt nitometer pointwise detection method to use sensed luminance.To this, some researchers then propose the thought that pointwise detects pixel power, this needs bigger workload undoubtedly, and show for information, the information that shows is seen to the people, for people's vision system, useful optical radiation power is the part of general power, so the thought itself that replaces brightness to detect with power detection is exactly inaccurate like this.
Summary of the invention
Technical matters to be solved by this invention provides a kind of method and system thereof that is applicable to the displaying luminance compensation of display screen of big or middle size, can realize more excellent luminance compensation effect under lower-cost prerequisite, makes that the brightness of display screen is more even.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method of displaying luminance compensation of display screen is characterized in that, comprises the steps:
Sampling procedure: light the entire display screen curtain, display screen is divided into several viewing areas, ad-hoc location is a resample area in each viewing area, obtains the brightness value of resample area respectively;
Viewing area brightness estimating step:, estimate the brightness value of the viewing area at this resample area place respectively according to the brightness value of described resample area;
Compensation process: according to the brightness value in described zone, respectively to the described zone electric current that affords redress, and the time by the control compensation electric current, obtain the corresponding compensation brightness value so that described display screen display brightness even.
Wherein, according to the brightness value in described zone, respectively to the described zone electric current that affords redress, and the time by the control compensation electric current, obtain the corresponding compensation brightness value, so that described display screen display brightness is even.
After compensation is carried out, the time of the offset current relevant with each regional luminance value, promptly the data of relevant compensation can be retained in the configuring chip of fpga chip, think all to light again display screen when later on, when perhaps showing picture and text and so on display screen, each offset data still can play effective compensating action.
Adopt technique scheme,, needn't obtain the brightness value of wherein all pixels, and only need measure the wherein brightness value of some specific pixel point by the certain luminance meter for each viewing area that adjoins each other and arrange.Like this, needn't adopt too much devices such as optical sensor, reduce manufacturing cost.See that on the actual displayed effect technique scheme also has following advantage: at first, optical sensor can block the output of display screen part light, the display effect that influence is actual, and technique scheme has reduced blocking the light of display screen; Secondly, in the technique scheme, specific nitometer is measured the brightness value of some specific pixel point specially, and like this, it is much high that its measuring accuracy also will be measured the mode than the brightness value in the big zone than a sort of optical sensor unit.
Like this, adopt technique scheme, under the prerequisite of equivalent signals input, the brightness of the various piece of display screen shows can be more balanced.
And well-known, the voltage-current curve of OLED is very irregular, under some voltage range, and 2V to 4V for example, its current curve will very precipitous, and the change in voltage of a little will cause very big electric current variation, thereby cause the great changes of brightness.To this, also special employing the in the technique scheme, respectively to the described zone electric current that affords redress, and the time by the control compensation electric current, the mode that obtains the corresponding compensation brightness value is come the brightness of control compensation.Wherein, the size of offset current is certain, only needs to adjust brightness by the time that changes offset current, and its storage effect is exactly the size of compensate for brightness.
Like this, further optimized the control model of compensation, time value is better controlled than actual curtage value, does not need too much current/voltage conversion, detection means, has further improved the homogeneity of display screen display brightness.
Preferably, described viewing area is successively in abutting connection with the big or small identical rectangular area of arranging.
Wherein, the parallelogram that an angle is arranged is the right angle is called rectangle, comprising: rectangle and square.
Preferably, in a described viewing area, described resample area comprises: the zone that lays respectively at four jiaos of described viewing areas.
Preferably, a described viewing area is that P * P pixel is formed, and the resample area in this viewing area is respectively the pixel at place, four summits, this this viewing area.
Wherein, P is a natural number.
Preferably, described P value is 8.
Preferably, described viewing area brightness estimating step adopts the rectangle interpolation algorithm to the brightness value of described resample area, with the brightness value of the viewing area that estimates this resample area place.
Preferably, described viewing area brightness estimating step adopts the rectangle interpolation algorithm to the brightness value of described resample area, with the brightness value of the viewing area that estimates this resample area place.
Further, in described viewing area brightness estimating step, the coordinate of the resample area in the described viewing area is respectively (x 1, y 1), (x 2, y 1), (x 2, y 2) and (x 1, y 2), then the brightness value of this resample area is respectively Z 1=f (x 1, y 1), Z 2=f (x 2, y 1), Z 3=f (x 2, y 2) and Z 4=f (x 1, y 2), estimate that the brightness value of the viewing area at this resample area place is: P (x, y)=Z 1(1-u) (1-v)+Z 2U (1-v)+Z 3Uv+Z 4(1-u) v;
Wherein, u=(x-x 1)/(x 2-x 1), v=(y-y 1)/(y 2-y 1).
Wherein, above-mentioned coordinate is the coordinate in the plane at display screen place.In reality showed, display screen was in the zone of closing on, and the otherness that brightness changes is often little.Especially as enough hour of the distance, delta d of two adjacent pixels, the luminance difference between neighbor can be considered as LINEAR CONTINUOUS to be changed.Therefore, further adopt abovementioned technology,, should adopt bilinear interpolation, will obtain more excellent interpolation because the plane of display screen is a two-dimensional space.
The present invention also further provides a kind of system of displaying luminance compensation of display screen, and described display screen is divided into several viewing areas, and ad-hoc location is a resample area in each viewing area; Described system comprises:
Sampler is used for gathering respectively the brightness value of resample area;
Compensation system is used for respectively providing specific offset current to described viewing area, and the time by the control compensation electric current, obtains the corresponding compensation brightness value;
Compensate control apparatus is used for the brightness value according to the resample area that described sampler obtained that is received, control described compensation system and respectively the pixel in the different viewing areas carried out luminance compensation so that described display screen display brightness even.
Compared with prior art the present invention also may have following advantage: at first be, adopt bilinear interpolation, can avoid pointwise to detect huge workload; Secondly, because show for information, the information that shows is seen to the people, vision system for the people, useful optical radiation power is the part of general power, so the fluorescent lifetime that should adjust each pixel according to the brightness value rather than the performance number of pixel, the advantage of doing like this is that the offset data that calculates is more accurate, thereby obtains better brightness uniformity.
In addition, adopt technical scheme of the present invention, further during the check compensation effect, emphasis is selected the not compensation effect of detection zone, rather than the compensation effect of check point, can reflect the compensation effect of entire display screen better
Description of drawings
Fig. 1 is the monochromatic passive OLED display panel synoptic diagram of 64 row, 32 row (64 * 32) pixels " some district ";
Fig. 2 is preceding 16 row, the 16 row brightness value data of a certain part matrix Hx in the display screen in an embodiment of the present invention;
Fig. 3 is brightness value data in a certain resample area in the display screen in an embodiment of the present invention;
Fig. 4 is with preceding 16 row, 16 column data of clk_low in an embodiment of the present invention;
Fig. 5 is the top layer design concept of compensating circuit in an embodiment of the present invention;
Fig. 6 is the structured flowchart of the system of displaying luminance compensation of display screen in an embodiment of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and preferred embodiment.
As shown in Figure 6, described display screen is divided into several viewing areas, and ad-hoc location is a resample area in each viewing area; A kind of system of displaying luminance compensation of display screen comprises:
Sampler is used for gathering respectively the brightness value of resample area;
Compensation system is used for respectively providing specific offset current to described viewing area, and the time by the control compensation electric current, obtains the corresponding compensation brightness value;
Compensate control apparatus is used for the brightness value according to the resample area that described sampler obtained that is received, control described compensation system and respectively the pixel in the different viewing areas carried out luminance compensation so that described display screen display brightness even.
The method of displaying luminance compensation of display screen comprises the steps:
A1) the OLED display screen that will have the capable N row of a M pixel is divided into J the rectangular area that size is identical, and each rectangular area is and comprises the capable Q row of P pixel, i.e. resample area;
A2) light the OLED display screen is full frame, make each pixel all reach its high-high brightness, use nitometer to detect the brightness value of the pixel on all four summits of resample area;
A3), use the rectangle interpolation theory to release the brightness value of other pixel at each resample area;
A4) adjust its fluorescent lifetime according to the brightness of each pixel and carry out luminance compensation, this pixel before the fluorescent lifetime of the pixel after the compensation " some district " and the compensation " some district " brightness is inversely proportional to.
Be that shows signal itself is carried out time control, (i, in the time of j) need lighting, fluorescent lifetime is for clk_high, not the corresponding clk_low of fluorescent lifetime when certain pixel.
Lines among the top layer design concept figure etc. are the inner decision of Quartus II entirely.Certain data type that fine rule is corresponding one, thick line is represented certain data type of multidigit.The frame line of the size of each module also is to generate automatically entirely.
Wherein, the brightness of each pixel is adjusted its fluorescent lifetime and is carried out luminance compensation, is meant shows signal itself is carried out time control, and (i, in the time of j) need lighting, fluorescent lifetime is for clk_high, not the corresponding clk_low of fluorescent lifetime when certain pixel.
Be illustrated in figure 1 as the common cathode passive OLED panel synoptic diagram of 64 * 32 pixels, each rectangular area is 8 * 8 pixel zones, is respectively its sample area in the place, four summits of each described rectangular area pixel.
In described steps A 1, M/P=4 and N/Q=8 are positive integer, and represent respectively the OLED display screen on vertical and horizontal by the number of five equilibrium; J=(M/P) * (N/Q)=32 represents the number of resample area.
In described steps A 2, for adjacent junction, rectangular area, its resample area also adjoins each other, and can make respectively brightness value as these two resample area by the brightness average of getting adjacent resample area.The brightness average of four resample area in the same rectangular area is estimated as the brightness value of all pixels in this rectangular area.
The brightness value of all pixels of display screen can be represented with the matrix of the capable N row of corresponding with it M, set up the matrix H x of the capable N row of M with the MATLAB coding, the matrix of above-mentioned each subregion top " some district " pixel brightness value correspondence is noted, for not measuring " some district ", temporarily its brightness value is designated as zero.Fig. 2 is preceding 16 row, 16 row of the matrix H x that obtains behind the working procedure, and all the other ranks situations are similar, because picture is too big, so all do not list.
For present embodiment, get external crystal-controlled oscillation frequency Fout=10 megahertz, the first divider ratio W=2 of external crystal-controlled oscillation, the clk periodicity B=128 that comprises horizontal-scanning interval, the line number M=32 of the pixel of display screen, the columns N=64 of the pixel of display screen.The line number P=8 of the pixel of its rectangular area, columns Q=8.When lighting entirely before the entire display screen compensation the minimum pixel of brightness brightness value L min=50 (cd/m 2).The frequency Fclk of its clk, the period T clk of clk, then horizontal-scanning interval, Trow and display screen frame frequency f can be calculated by following expression:
Fclk=Fout/W,Tclk=1/Fclk=W/Fout,Trow=B×Tclk=B×W/Fout,f=Fout/W/B/k/M;
Wherein, 76 hertz>50 hertz of f ≈ promptly can satisfy people's vision requirement.
In described steps A 3, the rectangle interpolation theory has another name called the bilinear interpolation theory, the pixel on four summits of each rectangular area as the brightness value of resample area as the basis of estimating whole rectangular area brightness value.As use MATLAB software programming program, just can calculate the brightness value of other all pixels that do not detect.This moment, the brightness value of whole display panel was represented with matrix H, because the whole front panel data are too many, only provided the data of preceding 8 row, 8 row of H here, as shown in Figure 3.
In described steps A 4, the fluorescent lifetime of corresponding pixel is: and T (i, j)=T 0* L Min/ L (i, j).Wherein, T (i, the j) fluorescent lifetime of the capable j row of expression i pixel " some district ", T 0Be the original fluorescent lifetime of the capable j row of i pixel " some district ", T in the present embodiment 0=T Row=B * T Clk=B * W/F Out, wherein, L MinBe the brightness minimum of all pixels on the entire display screen, L (i, j) light emission luminance value of pixel before compensation of the capable j row of expression i.
What the display screen among this embodiment adopted is the common cathode panel, so when m[m=1,2,3,, k * M] and row is when being scanned (m behavior this moment low level), if n[n=1 wherein, 2,3 ..., λ * N] and the pixel of row needs luminously, then needs following steps:
1. calculate the residing rectangular area of the capable n row of m pixel: if k * (i-1)<m≤k * i, λ * (j-1)<and n≤λ * j, then this pixel is positioned at the rectangular area of the capable j row of i;
2. even in order to reach brightness, its corresponding high level lasting time (being ON time) is:
clk_high(i,j)=round(B×L min/L(i,j))×W/F out
Wherein, round is a bracket function among the MATLAB;
3. because display screen is the common cathode structure, so the low duration of j column data is at this moment:
Clk_low (i, j)=round (B-B * L Min/ L (i, j)) * W/F OutWherein clk_low is the matrix of the capable N row of M, its preceding 16 row, 16 column data such as Fig. 4, and all the other ranks are similar.
Wherein, when i is capable when being in scanning mode, if the pixel of j row need light, then its time of lighting be clk_high (i, j), the fall time be clk_low (i, j) .B=clk_low (i, j)+(i, j), B is horizontal-scanning interval to clk_high.
Difference: signal is a master data object of describing hardware system, and it is similar to connecting line, and signal can be used as the information interchange passage of the inner parallel subqueries intermodule of design entity; Port then is the interface channel of design entity and external circuit, and output port can not read in data, and input port can not be by assignment.
Contact: except the explanation that does not have direction, signal is consistent with the port of entity.Signal is the port of entity inside as can be seen.Otherwise the port of entity is a kind of signal of stealth.
In a word, the definition essence of port is the signal definition of having made implicit expression, and has added the direction of streams data.
When using Quartus II to generate top layer design concept figure, can only see port, but can't see internal signal, therefore in the drawings, find this signal among the design concept figure again.
Fig. 5 is the top layer design concept figure that " puts and distinguish " common cathode passive OLED panel luminance compensating circuit with 64 * 32 pixels that Quartus II 5.0 obtains, and is made up of frequency division module div_cnt, rank scanning module row_column_scan, row control module column_control, memory module rom_data and five modules of column data compensating module and_gate_64.
Input signal reset is the reset signal of entire circuit among the figure, external crystal-controlled oscillation is carried out the W frequency division through frequency division module div_clk, obtain the clk signal, the clk signal carries out the B frequency division through frequency division module div_cnt, obtain line scanning clock, the rom_data module provides original column data, and the output signal row_out in the row_column_scan module is the line output signal of whole compensating circuit, is used to realize the line scanning of selected display panel.In the column_control module, judge that according to the numerical value of cnt_in which row is in the state of being scanned, and the data correspondence of the clk_low that is obtained by MATLAB write in the VHDL program, provide the luminance compensation data by row, wherein every row provide the luminance compensation data by row again, and by carrying out λ * N position AND operation with original column data after the output terminal output, obtain row output data column_out, be the row output signal of whole compensating circuit, be used to provide the column data of selected display panel.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims (9)

1, a kind of method of displaying luminance compensation of display screen is characterized in that, comprises the steps:
Sampling procedure: light the entire display screen curtain, display screen is divided into several viewing areas, ad-hoc location is a resample area in each viewing area, obtains the brightness value of resample area respectively;
Viewing area brightness estimating step:, estimate the brightness value of the viewing area at this resample area place respectively according to the brightness value of described resample area;
Compensation process: according to the brightness value in described zone, provide specific offset current to described zone respectively, and the time by the control compensation electric current, obtain the corresponding compensation brightness value so that described display screen display brightness even.
2, the method for displaying luminance compensation of display screen as claimed in claim 1 is characterized in that, described viewing area is successively in abutting connection with the rectangular area of arranging, size is identical.
3, the method for displaying luminance compensation of display screen as claimed in claim 2 is characterized in that, in a described viewing area, described resample area comprises: the zone that lays respectively at four jiaos of described viewing areas.
4, the method for displaying luminance compensation of display screen as claimed in claim 3 is characterized in that, a described viewing area is that P * P pixel is formed, and the resample area in this viewing area is respectively the pixel at place, four summits, this this viewing area.
5, the method for displaying luminance compensation of display screen as claimed in claim 4 is characterized in that, described P value is 8.
6, the method for displaying luminance compensation of display screen as claimed in claim 3, it is characterized in that, described viewing area brightness estimating step adopts the rectangle interpolation algorithm to the brightness value of described resample area, with the brightness value of the viewing area that estimates this resample area place.
7, as the method for claim 4 or 5 described displaying luminance compensation of display screen, it is characterized in that, described viewing area brightness estimating step adopts the rectangle interpolation algorithm to the brightness value of described resample area, with the brightness value of the viewing area that estimates this resample area place.
8, the method for displaying luminance compensation of display screen as claimed in claim 7 is characterized in that, in described viewing area brightness estimating step,
The coordinate of the resample area in the one described viewing area is respectively (x 1, y 1), (x 2, y 1), (x 2, y 2) and (x 1, y 2), then the brightness value of this resample area is respectively Z 1=f (x 1, y 1), Z 2=f (x 2, y 1), Z 3=f (x 2, y 2) and Z 4=f (x 1, y 2), estimate that then the brightness value of the viewing area at this resample area place is: P (x, y)=Z 1(1-u) (1-v)+Z 2U (1-v)+Z 3Uv+Z 4(1-u) v;
Wherein, u=(x-x 1)/(x 2-x 1), v=(y-y 1)/(y 2-y 1).
9, a kind of system of displaying luminance compensation of display screen is characterized in that, described display screen is divided into several viewing areas, and ad-hoc location is a resample area in each viewing area; Described system comprises:
Sampler is used for gathering respectively the brightness value of resample area;
Compensation system is used for respectively providing specific offset current to described viewing area, and the time by the control compensation electric current, obtains the corresponding compensation brightness value;
Compensate control apparatus is used for the brightness value according to the resample area that described sampler obtained that is received, control described compensation system and respectively the pixel in the different viewing areas carried out luminance compensation so that described display screen display brightness even.
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