CN109166511A - Display device compensates table compression method - Google Patents
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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Abstract
The present invention relates to a kind of display devices to compensate table compression method.The display device compensation table compression method includes: to detect all regions Mura according to former compensation table, and feedback obtains four apex coordinates, central point grayscale and the grey scale average value in the non-region Mura of each tangent rectangle in the region Mura；Determine the Gaussian parameter and Gauss model in each region Mura；Former compensation table subtracts the Gauss model in all regions Mura, obtains new compensation table；The new compensation table of compression, obtains the compressed package of new compensation table；Save the grey scale average value in the non-region Mura in former compensation table, the Gaussian parameter in each region Mura, and the compressed package of new compensation table.Display device compensation table compression method of the invention carries out elimination reduction to the region Mura using Gauss model, keep the grayscale of former compensation table closer, it is more convenient for compressing, to which compression efficiency be significantly greatly increased, reduce the occupancy to memory headroom, the hardware resource of saving system reduces cost, reduces the time of transmission and burning data consuming.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of display device to compensate table compression method.
Background technique
Panel display apparatus has many merits such as thin fuselage, power saving, radiationless, is widely used.Current
Display panel often has the defect of brightness unevenness (Mura) due to production technology etc..
The presence in the region Mura will not the use function to display panel impact, but can reduce user viewing relax
Appropriateness, therefore constrain the development of LCD display panel and OLED display panel.Existing display panel is general after finalization of the manufacture
It needs by automatic optical detection device to detect whether that there are the regions Mura.
For the region Mura for eliminating display panel, the compensated information that compensation table stores each pixel is generallyd use.Projecting images
When, driving plate searches compensation table, and adjustment signal is turned up by the signal that panel crosses dark areas, and the signal of overly bright region is turned down, and is presented
Uniform display effect.In compensation table, each pixel corresponds to one group of compensated information, and every group of compensated information includes one or more
A offset data.The physical significance of offset data is depending on algorithm, and usually the adjusted value of specific grey-scale, also has algorithm to be set
It is set to voltage value to be adjusted.
Compensation table records the compensated information of each pixel/sub-pixel, and the size for compensating table is equal to panel pixel number multiplied by every
The size of group compensated information.If compensating 55 cun of UHD (ultra high-definition) RGB panels, it is assumed that each sub-pixel compensated information is
24bit, then compensating table data volume is length × wide × compensated information bit number × chromatic number=2160 × 3840 × 24bit × 3
≈597Mb.It compensates table and occupies a large amount of system memory resources, it is higher to requirements for hardware；And transmission, burning number in producing line
According to process expend the time.
In fact, each grayscale has correlation, and there are the possibility of compression in compensation table.
Summary of the invention
Therefore, the purpose of the present invention is to provide a kind of display devices to compensate table compression method, is replaced using Gauss model
The region Mura keeps compensation table grayscale close, convenient for compression.
To achieve the above object, the present invention provides a kind of display devices to compensate table compression method, comprising:
All regions Mura are detected according to former compensation table, four vertex that feedback obtains each tangent rectangle in the region Mura are sat
Mark, central point grayscale and the grey scale average value in the non-region Mura；
Determine the Gaussian parameter and Gauss model in each region Mura；
Former compensation table subtracts the Gauss model in all regions Mura, obtains new compensation table；
The new compensation table of compression, obtains the compressed package of new compensation table；
Save the grey scale average value in the non-region Mura in former compensation table, the Gaussian parameter in each region Mura, and new compensation
The compressed package of table.
Wherein, true by Threshold segmentation before further comprising the steps of: the Gaussian parameter and Gauss model that determine each region Mura
Determine the region Mura.
Wherein, the Gauss model is
Wherein, Gauss
Parameter A is Mura regional center point grayscale, and Gaussian parameter θ is inclination angle, Gaussian parameter μxAnd μyIt is that Mura regional center point is sat
Mark, Gaussian parameter σxAnd σyIt is long and wide to represent the region Mura；Offset is the grey scale average value in the non-region Mura.
Wherein, center point coordinate μ is obtained using four apex coordinates of the tangent rectangle in the region MuraxAnd μy；Traverse the area Mura
Domain all the points look for two points farthest from central point, tiltangleθ are obtained, so that it is determined that the length and width in the region Mura.
Wherein, when further comprising the steps of: decompression, the compressed package for decompressing new compensation table obtains new compensation table, according to preservation
The Gaussian parameter in the grey scale average value in the non-region Mura and each region Mura constructs the height in all regions Mura in former compensation table
The Gauss model in all regions Mura is added in new compensation table by this model, obtains former compensation table.
The present invention also provides a kind of display devices to compensate table compression method, comprising:
All regions Mura are detected according to former compensation table, four vertex that feedback obtains each tangent rectangle in the region Mura are sat
Mark, central point grayscale and the grey scale average value in the non-region Mura；
Determine the Gaussian parameter and Gauss model in each region Mura；
Each region Mura rebuilds to obtain corresponding each reconstruction Mura respectively using Gauss model according to the Gaussian parameter of itself
Region；
Each region reconstruction Mura is individually subtracted in each region Mura, respectively obtains each region Mura residual error, and compression is each respectively
The region Mura residual error obtains the compressed package of each region Mura residual error；
Save the grey scale average value in the non-region Mura in former compensation table, the Gaussian parameter and each Mura in each region Mura
The compressed package of region residual error.
Wherein, true by Threshold segmentation before further comprising the steps of: the Gaussian parameter and Gauss model that determine each region Mura
Determine the region Mura.
Wherein, the Gauss model is
Wherein, Gauss
Parameter A is Mura regional center point grayscale, and Gaussian parameter θ is inclination angle, Gaussian parameter μxIt is that Mura regional center point is sat with μ y
Mark, Gaussian parameter σxAnd σyIt is long and wide to represent the region Mura；Offset is the grey scale average value in the non-region Mura.
Wherein, center point coordinate μ is obtained using four apex coordinates of the tangent rectangle in the region MuraxAnd μy；Traverse the area Mura
Domain all the points look for two points farthest from central point, tiltangleθ are obtained, so that it is determined that the length and width in the region Mura.
Wherein, when further comprising the steps of: decompression, decompressing the compressed package of each region Mura residual error, to obtain each region Mura residual
Difference constructs all according to the grey scale average value in the non-region Mura and the Gaussian parameter in each region Mura in the former compensation table of preservation
The Gauss model in the region Mura obtains former compensation table plus the Gauss model in each region Mura with each region Mura residual error respectively
All regions Mura rebuild former compensation table further according to the grey scale average value in the non-region Mura.
To sum up, display device compensation table compression method of the invention eliminate to the region Mura weak using Gauss model
Change, keep the grayscale of former compensation table closer, be more convenient for compressing, so that compression efficiency be significantly greatly increased, reduction accounts for memory headroom
With, it saves the hardware resource of system, reduce cost, the time of reduction transmission and burning data consuming.
Detailed description of the invention
With reference to the accompanying drawing, by the way that detailed description of specific embodiments of the present invention, technical solution of the present invention will be made
And other beneficial effects are apparent.
In attached drawing,
Figure 1A is the flow chart that a display device of the invention compensates table compression method；
Figure 1B is the Main Stage schematic diagram of method shown in Figure 1A；
Fig. 2A is the flow chart that the another display device of the present invention compensates table compression method；
Fig. 2 B is the Main Stage schematic diagram of method shown in Fig. 2A；
Fig. 3 is the flow chart that a display device of the invention compensates one preferred embodiment of table compression method；
Fig. 4 is the flow chart that the another display device of the present invention compensates one preferred embodiment of table compression method.
Specific embodiment
The display device of that present invention compensation table compression method carries out elimination reduction to the region Mura using Gauss model, makes former benefit
The grayscale for repaying table is closer, is more convenient for compressing.
Ginseng is shown in Figure 1A and Figure 1B, and Figure 1A is the flow chart that a display device of the invention compensates table compression method, and Figure 1B is this
The Main Stage schematic diagram of invention display device compensation table compression method.The display device of that present invention compensation table compression method mainly wraps
Include following steps:
S1, all regions Mura are detected according to former compensation table, feedback obtains four tops of each tangent rectangle in the region Mura
Point coordinate, central point grayscale and the grey scale average value in the non-region Mura；
The former compensation table of record compensated information, the region Mura corresponding shape in compensation table are represented in Figure 1B with gray scale image
At Mura image；All regions Mura are detected according to former compensation table, such as the region Mura 1, the region Mura 2 and the region Mura 3；Instead
Present four apex coordinates of tangent rectangle, the grey scale average value of central point grayscale and the non-region Mura.
S2, the Gaussian parameter and Gauss model for determining each region Mura；
Gauss model of the invention can use following form:
Wherein, Gaussian parameter A is central point grayscale, and θ is inclination angle, μxAnd μyIt is the center point coordinate of Gauss model, σxWith
σyThe length and width of Gauss model are represented, offset is the grey scale average value in the non-region mura.
1. if, such as the region Mura 1 in Figure 1B and the region Mura 2, being obtained using four apex coordinates the region Mura is not tilted
Center point coordinate, i.e. μxAnd μy.The length and width in the region Mura, i.e. σxAnd σy.θ=0 at this time, recombination center point grayscale and non-Mura
The grey scale average value in region determines the Gauss model in the current region Mura.
2. if Mura regional dip obtains center point coordinate using four apex coordinates, i.e., such as the region Mura 3 in Figure 1B
μxAnd μy.Traversal all the points look for two points farthest from central point, obtain tiltangleθ, so that it is determined that the length and width in the region Mura, i.e.,
σxAnd σy.The grey scale average value of recombination center point grayscale and the non-region Mura determines the Gauss model in the current region Mura.
S3, former compensation table subtract the Gauss model in all regions Mura, obtain new compensation table；
After the Gauss model in the region Mura in former compensation table all determines, the height in all regions Mura is subtracted with former compensation table
This model.The present invention carries out elimination reduction to the region Mura using Gauss model, keeps the grayscale of former compensation table closer, is more convenient for
Subsequent compression；After the region Mura is eliminated, the region Mura 1 of the former compensation table after reduction is represented by dotted lines in Figure 1B, the area Mura
Domain 2 and the region Mura 3.
S4, the new compensation table of compression, obtain the compressed package of new compensation table；
S5, the grey scale average value for saving the non-region Mura in former compensation table, the Gaussian parameter in each region Mura, and new benefit
Repay the compressed package of table.
New compensation table is compressed, the final grey scale average value that need to only save the non-region Mura in former compensation table is each
Mura regional center point grayscale, center point coordinate, length and width and inclination angle, and the compressed package of new compensation table can make subsequent
Used time is decompressed into former compensation table.
When decompression, the compressed package of new compensation table can be decompressed first, further according to all regions Mura of information architecture of preservation
Gauss model, Gauss model is added in new compensation table, former compensation table can be rebuild.The compressed package for decompressing new compensation table obtains
New compensation table, according to the grey scale average value in the non-region Mura and the Gaussian parameter structure in each region Mura in the former compensation table of preservation
The Gauss model in all regions Mura is added in new compensation table by the Gauss model for building all regions Mura, obtains former compensation table.
Referring to Fig. 3, the flow chart of one preferred embodiment of table compression method is compensated for a display device of the invention, it is main to wrap
It includes:
1. detecting the region Mura, and feed back four apex coordinates of tangent rectangle, central point grayscale and the non-region Mura
Grey scale average value.
2. optionally it is determined that being determined before the Gaussian parameter and Gauss model in the current region Mura by Threshold segmentation
The region Mura.To represent the former gray scale image for compensating table as detection image, using each region Mura as prospect from as background
It is split in detection image, so as to accurately divide the region Mura and the non-region Mura.
The grayscale value in each region Mura had not only been likely larger than background grayscale value, but also was likely less than background grayscale value, it is possible to
The method handled using multi-threshold, i.e., multiple global threshold processing methods divide the region Mura.Such as Da-Jin algorithm can be passed through
(Otsu) grayscale value of detection image is calculated, it is maximum by the variance between each region after dividing detection image
Threshold segmentation is completed, to split from the detection image as background using each region Mura as prospect.
For example, needing two threshold values when needing detection image to be divided into three regions, doing the straight of detection image original image
Fang Tu takes the center of two histogram troughs in histogram as two threshold values T1, T2, threshold value and the gray-scale distribution of whole figure have
It closes, treated that image is given by for Threshold segmentation:
Wherein a, b, c are any three effective grayscale values, and f (x, y) indicates inspection
Altimetric image original image, g (x, y) are indicated with double Otsu threshold value T1,T2Image after segmentation.
3. obtaining the Gaussian parameter in the current region Mura, respectively center point coordinate using four apex coordinates.Traversal institute
Two points farthest from central point are looked for a little, inclination angle are obtained, so that it is determined that the length and width in the region Mura.Recombination center point grayscale
With the grey scale average value in the non-region Mura, the Gauss model in the current region Mura is determined.
4. will compensate all regions Mura in table presses step 3, its Gauss model is determined, and subtracted with original compensation table all
The Gauss model in the region Mura obtains new compensation table, and compresses to new compensation table.It finally need to only save non-in former compensation table
The grey scale average value in the region Mura, each Mura regional center point grayscale, center point coordinate, length and width and inclination angle, and new benefit
The compressed package for repaying table can be decompressed into former compensation table.
5. when decompression, the compressed package of the new compensation table of decompression first, further according to all regions Mura of information architecture of preservation
Gauss model is added in new compensation table by Gauss model, can rebuild former compensation table.
A and Fig. 2 B referring to fig. 2, Fig. 2A are the flow chart that the another display device of the present invention compensates table compression method, and Fig. 2 B is
The Main Stage schematic diagram of the another display device compensation table compression method of the present invention.The another display device compensation gauge pressure contracting of the present invention
Method mainly includes the following steps:
S10, all regions Mura are detected according to former compensation table, feedback obtains four tops of each tangent rectangle in the region Mura
Point coordinate, central point grayscale and the grey scale average value in the non-region Mura；
The former compensation table of record compensated information, the region Mura corresponding shape in compensation table are represented in Fig. 2 B with gray scale image
At Mura image；All regions Mura are detected according to former compensation table, such as the region Mura 1, the region Mura 2 and the region Mura 3；Instead
Present four apex coordinates of tangent rectangle, the grey scale average value of central point grayscale and the non-region Mura.
S20, the Gaussian parameter and Gauss model for determining each region Mura；Gaussian parameter and Gauss model concrete form can join
See the description in method shown in Figure 1A.
S30, each region Mura rebuild to obtain corresponding each reconstruction respectively using Gauss model according to the Gaussian parameter of itself
The region Mura；
If having determined that the Gaussian parameter in each region Mura in Fig. 2 B, the region Mura is rebuild using Gauss model, for example, figure
It rebuilds to have obtained the region Mura 1 ' using the Gaussian parameter in the region Mura 1 in 2B.
Each region reconstruction Mura is individually subtracted in S40, each region Mura, respectively obtains each region Mura residual error, compresses respectively
Each region Mura residual error obtains the compressed package of each region Mura residual error；
The present invention carries out elimination reduction to the region Mura using Gauss model, keeps the grayscale of former compensation table closer, more just
In subsequent compression；Cancellation is to subtract reconstruction with the original region Mura in this another display device compensation table compression method
The former region Mura 1 in the region Mura, such as Fig. 2 B subtracts the region Mura 1 ' for rebuilding and obtaining, and then presses its residual error
Contracting；The present invention rebuilds all regions Mura of former compensation table, and asks poor with the former region Mura respectively, and compress to residual error.
S50, the grey scale average value for saving the non-region Mura in former compensation table, the Gaussian parameter in each region Mura, and it is each
The compressed package of the region Mura residual error.
The final grey scale average value that need to only save the non-region Mura in former compensation table, each Mura regional center point grayscale,
The compressed package of center point coordinate, length and width and inclination angle and all regions Mura residual error can be decompressed into subsequent use
Original compensation table.
When decompression, the compressed package for decompressing each region Mura residual error first obtains each region Mura residual error, further according to preservation
The Gaussian parameter in the grey scale average value in the non-region Mura and each region Mura constructs the height in all regions Mura in former compensation table
This model adds the Gauss model in each region Mura with each region Mura residual error respectively, can be obtained all of former compensation table
The region Mura rebuilds former compensation table further according to the grey scale average value in the non-region Mura.
Referring to fig. 4, the flow chart of one preferred embodiment of table compression method is compensated for the another display device of the present invention, it is main to wrap
It includes:
10. detecting the region Mura, and feed back four apex coordinates of tangent rectangle, central point grayscale and the non-region Mura
Grey scale average value.
20. optionally it is determined that being determined before the Gaussian parameter and Gauss model in the current region Mura by Threshold segmentation
The region Mura.
30. obtaining the Gaussian parameter in the current region Mura, respectively center point coordinate using four apex coordinates.Traversal institute
Two points farthest from central point are looked for a little, inclination angle are obtained, so that it is determined that the length and width in the region Mura.Recombination center point grayscale
With the grey scale average value in the non-region Mura, the Gauss model in the current region Mura is determined.
40. if, using the region Model Reconstruction Mura, being used have determined that the Gaussian parameter in 1 region Mura by step 30
The former region Mura, which subtracts, rebuilds the region Mura, and compresses to its residual error.Similarly, all regions Mura are rebuild, and respectively
It asks poor with the former region Mura, and residual error is compressed.The final grayscale that need to only save the non-region Mura in former compensation table is average
Value, the compression of each Mura regional center point grayscale, center point coordinate, length and width and inclination angle and all regions Mura residual error
Packet can be decompressed into former compensation table.
50. the compressed package of each region Mura residual error is decompressed first when decompression, it is all further according to the information architecture of preservation
The Gauss model in the region Mura can be obtained on former compensation table with the residual error in the region Mura plus the Gauss model rebuild respectively
All regions Mura can rebuild former compensation table further according to the grey scale average value in the non-region Mura.
To sum up, display device compensation table compression method of the invention eliminate to the region Mura weak using Gauss model
Change, keep the grayscale of former compensation table closer, be more convenient for compressing, so that compression efficiency be significantly greatly increased, reduction accounts for memory headroom
With, it saves the hardware resource of system, reduce cost, the time of reduction transmission and burning data consuming.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the appended right of the present invention
It is required that protection scope.
Claims (10)
1. a kind of display device compensates table compression method characterized by comprising
Detect all regions Mura according to former compensation table, feedback obtain each tangent rectangle in the region Mura four apex coordinates,
Central point grayscale and the grey scale average value in the non-region Mura；
Determine the Gaussian parameter and Gauss model in each region Mura；
Former compensation table subtracts the Gauss model in all regions Mura, obtains new compensation table；
The new compensation table of compression, obtains the compressed package of new compensation table；
Save the grey scale average value in the non-region Mura in former compensation table, the Gaussian parameter in each region Mura, and new compensation table
Compressed package.
2. display device as described in claim 1 compensates table compression method, which is characterized in that further comprise the steps of: and determine respectively
Before the Gaussian parameter and Gauss model in the region Mura, the region Mura is determined by Threshold segmentation.
3. display device as described in claim 1 compensates table compression method, which is characterized in that the Gauss model isWherein, Gaussian parameter A is
Mura regional center point grayscale, Gaussian parameter θ are inclination angle, Gaussian parameter μxAnd μyIt is Mura regional center point coordinate, Gao Sican
Number σxAnd σyIt is long and wide to represent the region Mura；Offset is the grey scale average value in the non-region Mura.
4. display device as claimed in claim 3 compensates table compression method, which is characterized in that utilize the tangent rectangle in the region Mura
Four apex coordinates obtain center point coordinate μxAnd μy；Two farthest from central point are looked for by traversing the region Mura all the points
Point obtains tiltangleθ, determines the length and width in the region Mura.
5. display device as described in claim 1 compensates table compression method, which is characterized in that when further comprising the steps of: decompression,
The compressed package for decompressing new compensation table obtains new compensation table, according to the grey scale average value in the non-region Mura in the former compensation table of preservation with
And the Gaussian parameter in each region Mura constructs the Gauss model in all regions Mura, and the Gauss model in all regions Mura is added to
In new compensation table, former compensation table is obtained.
6. a kind of display device compensates table compression method characterized by comprising
Detect all regions Mura according to former compensation table, feedback obtain each tangent rectangle in the region Mura four apex coordinates,
Central point grayscale and the grey scale average value in the non-region Mura；
Determine the Gaussian parameter and Gauss model in each region Mura；
Each region Mura rebuilds to obtain corresponding each region reconstruction Mura respectively using Gauss model according to the Gaussian parameter of itself；
Each region reconstruction Mura is individually subtracted in each region Mura, respectively obtains each region Mura residual error, compresses each area Mura respectively
Domain residual error obtains the compressed package of each region Mura residual error；
Save the grey scale average value in the non-region Mura in former compensation table, the Gaussian parameter in each region Mura and each region Mura
The compressed package of residual error.
7. display device as claimed in claim 6 compensates table compression method, which is characterized in that further comprise the steps of: and determine respectively
Before the Gaussian parameter and Gauss model in the region Mura, the region Mura is determined by Threshold segmentation.
8. display device as claimed in claim 6 compensates table compression method, which is characterized in that the Gauss model isWherein, Gaussian parameter A is
Mura regional center point grayscale, Gaussian parameter θ are inclination angle, Gaussian parameter μxAnd μyIt is Mura regional center point coordinate, Gao Sican
Number σxAnd σyIt is long and wide to represent the region Mura；Offset is the grey scale average value in the non-region Mura.
9. display device as claimed in claim 8 compensates table compression method, which is characterized in that utilize the tangent rectangle in the region Mura
Four apex coordinates obtain center point coordinate μxAnd μy；Two farthest from central point are looked for by traversing the region Mura all the points
Point obtains tiltangleθ, determines the length and width in the region Mura.
10. display device as claimed in claim 6 compensates table compression method, which is characterized in that further comprise the steps of: decompression
When, the compressed package for decompressing each region Mura residual error obtains each region Mura residual error, according to the former compensation area Biao Zhongfei Mura of preservation
The Gaussian parameter in the grey scale average value in domain and each region Mura constructs the Gauss model in all regions Mura, respectively with each Mura
Region residual error obtains all regions Mura of former compensation table plus the Gauss model in each region Mura, further according to the non-region Mura
Grey scale average value rebuilds former compensation table.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110796995A (en) * | 2019-11-28 | 2020-02-14 | Tcl华星光电技术有限公司 | Processing method of compensation data of display panel and display device |
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