CN107731194A - A kind of mura compensation methodes and device - Google Patents

A kind of mura compensation methodes and device Download PDF

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Publication number
CN107731194A
CN107731194A CN201711167291.3A CN201711167291A CN107731194A CN 107731194 A CN107731194 A CN 107731194A CN 201711167291 A CN201711167291 A CN 201711167291A CN 107731194 A CN107731194 A CN 107731194A
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CN
China
Prior art keywords
pixel
abnormal
mura
liquid crystal
brightness
Prior art date
Application number
CN201711167291.3A
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Chinese (zh)
Inventor
张华�
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深圳市华星光电半导体显示技术有限公司
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Priority to CN201711167291.3A priority Critical patent/CN107731194A/en
Publication of CN107731194A publication Critical patent/CN107731194A/en

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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 by control of light from an independent source
    • G09G3/36Control 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 by control of light from an independent source using liquid crystals
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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 by control of light from an independent source
    • G09G3/36Control 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 by control of light from an independent source using liquid crystals
    • G09G3/3607Control 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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen

Abstract

The present invention provides mura compensation methodes and the device of a kind of liquid crystal panel, wherein, compensation method includes:The image that acquisition shoots to obtain to the liquid crystal panel;Judge to whether there is abnormal pixel in described image;If abnormal pixel in described image be present, centered on the position of the abnormal pixel, to set the average brightness of all pixels in pixel region in addition to the abnormal pixel as the intrinsic brilliance of the abnormal pixel;The mura offsets of liquid crystal panel according to the brightness calculation of the intrinsic brilliance of the abnormal pixel and normal pixel;The liquid crystal panel is compensated according to the mura offsets.For bright, dim spot panel be present in the present invention, or have on backlight module BLU under the dirty situation of point-like, by judging abnormal pixel and calculating its intrinsic brilliance, carry out certain mura repairings, the display effect of bright, dim spot and dirty peripheral region is not interfered with, avoids the occurrence of regional bright, dark heterogeneity situation.

Description

A kind of mura compensation methodes and device

Technical field

The present invention relates to screen display technology field, more particularly to a kind of mura compensation methodes and device.

Background technology

Due to factors such as the property differences between the skew in LCD processing procedure, liquid crystal molecule, LCD is in pure white The brightness of each regional location has differences under fixed gray level picture, forms mura phenomenons(Brightness unevenness one).According to brightness and ash The one-to-one relationship of rank value(Gamma gamma), it is bright, dark that the entirety of LCD panels can be improved by compensating grey decision-making Homogeneity, i.e., overall grey menu is shot by camera, on the basis of the brightness in LCD face plate centers region, analyze other regions With the luminance difference of central area, corresponding GTG mura offset datas are conversed(Improve ash in the region partially darker than central area Rank is worth, and offset data is positive number;The region partially brighter than central area reduces grey decision-making, and offset data is negative), then choose fixation The mura offset datas of interval location pixel are stored in flash(In order to reduce required flash capacity), time schedule controller (TCON)Offset data is read from flash after the upper electricity of IC, then each pixel is calculated under grey menu by linear interpolation Mura offset datas, with inputting picture signal(Grey decision-making)Make addition, subtraction operation, LCD panel overall pictures are improved with this Bright, dark homogeneity(It is identical grey decision-making to actually enter picture signal, but after the compensation of GTG mura offset datas, LCD The grey decision-making in each region of panel is different, but brightness but tends to be identical), as shown in Figure 1 and Figure 2.

As shown in Figure 3, Figure 4, other pixels in fixed intervals region are calculated by linear interpolation algorithm inside TCON IC Mura offset datas, A/B/C/D are the mura offset datas of fixed intervals region summit pixel, any picture in fixed intervals region The mura offset datas G of element can be represented by A/B/C/D.

When light/dark point on LCD panels being present(Single pixel), or the backlight module BLU surfaces of brightness are provided in the presence of ash During dirt/dirty(Phenomenon is the same as the dim spot on LCD panels), fixed intervals region residing for the abnormal pixel that goes out by system-computed Vertex position mura offset datas can be obvious bigger than normal/small, is carried out inside TCON IC using this mura offset data bigger than normal/small Linear interpolation calculates, in fixed intervals region the mura offset datas of other pixels also can with bigger than normal/small, cause light/dark point, Dirty position forms dark light boxed area after carrying out mura compensation, has a strong impact on product quality, as shown in Figure 5.

From the foregoing, it will be observed that for the dirty situation of stain on bright dim spot and the backlight module BLU in LCD, it is corresponding GTG mura offset datas can not be gone to calculate according to gamma, it is necessary to go to avoid abnormal compensation bigger than normal/small by processing Data produce, in order to avoid cause after linear interpolation that region property is bright, dark heterogeneity.

The content of the invention

The technical problems to be solved by the invention are, there is provided a kind of mura compensation methodes of liquid crystal panel and device, with Avoid LCD panels being present after bright dim spot and backlight module BLU has the mura compensation under soiled condition and exception occurs.

In order to solve the above-mentioned technical problem, the present invention provides a kind of mura compensation methodes of liquid crystal panel, including:

The image that acquisition shoots to obtain to the liquid crystal panel;

Judge to whether there is abnormal pixel in described image;

If abnormal pixel in described image be present, centered on the abnormal pixel, to set in pixel region except described Intrinsic brilliance of the average brightness of all pixels beyond abnormal pixel as the abnormal pixel;

The mura offsets of liquid crystal panel according to the brightness calculation of the intrinsic brilliance of the abnormal pixel and normal pixel;

The liquid crystal panel is compensated according to the mura offsets.

Wherein, specifically included in the judgement described image with the presence or absence of abnormal pixel:

Judge whether the brightness of a certain pixel exceedes judgment threshold with the luminance difference of its surrounding pixel, if then judging this pixel For abnormal pixel.

Wherein, it is described to judge whether a certain pixel intensity and the luminance difference of its surrounding pixel exceed judgment threshold, specifically It is:

Judge the brightness of the pixel, with centered on the pixel, with all in addition to the pixel at least 5 × 5 pixel regions Whether the difference between the average brightness of pixel exceedes the judgment threshold.

Wherein, the pixel region that sets is 5 × 5 pixel region.

The present invention also provides a kind of mura compensation devices of liquid crystal panel, including:

Acquisition module, the image for shooting to obtain to the liquid crystal panel for acquisition;

Judge module, for judging to whether there is abnormal pixel in described image;

Processing module, for when the judge module judges abnormal pixel to be present in described image, using the abnormal pixel as Center, the average brightness to set all pixels in pixel region in addition to the abnormal pixel are used as the abnormal pixel Intrinsic brilliance;

Computing module, for liquid crystal panel described in the intrinsic brilliance and the brightness calculation of normal pixel according to the abnormal pixel Mura offsets;

Compensating module, for being compensated according to the mura offsets to the liquid crystal panel.

Wherein, the judge module be specifically used for judge a certain pixel brightness and its surrounding pixel luminance difference whether More than judgment threshold, if then judging this pixel for abnormal pixel.

Wherein, the judge module judges that the brightness of a certain pixel judges with whether the luminance difference of its surrounding pixel exceedes Threshold value, it is specifically:

Judge the brightness of the pixel, with centered on the pixel, with all in addition to the pixel at least 5 × 5 pixel regions Whether the difference between the average brightness of pixel exceedes the judgment threshold.

Wherein, the pixel region that sets is 5 × 5 pixel region.

The beneficial effect of the embodiment of the present invention is:For bright, dim spot panel be present, or have on backlight module BLU Under the dirty situation of point-like, avoid going to calculate offset data using conventional gamma gamma, but by judging abnormal pixel And calculate its intrinsic brilliance, carry out certain mura repairings, be not in abnormal offset data bigger than normal/small, do not interfere with it is bright, The display effect of dim spot and dirty peripheral region, avoid the occurrence of regional bright, dark heterogeneity situation.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Other accompanying drawings are obtained according to these accompanying drawings.

Fig. 1 is existing mura compensation schematic diagram;

Fig. 2 is the existing brightness contrast schematic diagram front and rear to LCD mura compensation;

Fig. 3 is the mura offset data schematic diagrames of any pixel in existing fixed intervals region;

Fig. 4 is compensation brightness contrast schematic diagram in existing fixed intervals region;

Fig. 5 is the schematic diagram that bright block is formed after existing compensation method is compensated dim spot;

Fig. 6 is the schematic flow sheet of the mura compensation methodes of liquid crystal panel of the present invention;

Fig. 7 is contrast schematic diagram before and after abnormal pixel brightness processed of the present invention;

Fig. 8 is compensation brightness contrast schematic diagram in abnormality processing region after being compensated according to compensation method of the present invention.

Embodiment

The explanation of following embodiment is refer to the attached drawing, can be to the specific embodiment implemented to the example present invention.

Refer to shown in Fig. 6, the embodiment of the present invention one provides a kind of mura compensation methodes of liquid crystal panel, including:

The image that S1, acquisition shoot to obtain to the liquid crystal panel;

Specifically, step S1 is to pass through camera(Such as CCD camera)Liquid crystal panel is taken pictures and obtains respective image.

S2, judge to whether there is abnormal pixel in described image;

As it was previously stated, if LCD, which exists, has dirty point in dim spot pixel, or LED backlight module, pass through in step S1 Camera(Such as CCD camera)Shoot on obtained image, the brightness of abnormal pixel position can be significantly lower than the brightness of surrounding pixel. Therefore, the present embodiment set a decision threshold a, i.e., when analyze view data, if find a certain pixel brightness and its four After the luminance difference of all pixels exceedes judgment threshold a, then judge this pixel for abnormal pixel.Judgment threshold a is needed according to reality Situation is set, including backlight illumination and LCD penetrance in itself, substantially can be bright more than 20 GTGs or so Degree.Further, judge whether the brightness of a certain pixel exceedes judgment threshold a with the luminance difference of its surrounding pixel, be specifically The brightness of the pixel is judged, and centered on the pixel, with all pixels at least in 5 × 5 pixel regions(Except the pixel)'s Whether the difference between average brightness exceedes judgment threshold a.

If abnormal pixel be present in S3, described image, centered on the abnormal pixel, to set in pixel region Intrinsic brilliance of the average brightness of all pixels in addition to the abnormal pixel as the abnormal pixel;

, then can not be according to gamma gamma for the offset data of abnormal pixel after judging abnormal pixel by step S2 Calculated, it is necessary to be handled as follows to obtain the mura offset datas of abnormal pixel:

Centered on abnormal pixel, with all pixels at least in 5 × 5 pixel regions(Except abnormal pixel)Average brightness make For the intrinsic brilliance of abnormal pixel.

The pixel region that the present embodiment is set is too small as 5 × 5 pixel regions, and it is less to include the data of calculating, as a result not It is too accurate;Although pixel region is bigger, result is more accurate, needs data to be processed can be more, therefore the 5 × 5 of the present embodiment Pixel region is suitable.

It refer to again shown in Fig. 7, be contrast schematic diagram of one 5 × 5 pixel regions before and after abnormal pixel brightness processed, The pixel brightness value that before processing obtains central point is 2, finds the brightness significantly lower than surrounding pixel, is determined as by abovementioned steps S2 Abnormal pixel, it is 8.8 that its surrounding pixel intensity average value, which is then calculated, then using brightness value 8.8 as the abnormal pixel Intrinsic brilliance.

The mura of liquid crystal panel described in S4, the intrinsic brilliance according to the abnormal pixel and normal pixel brightness calculation is mended Repay value;

As shown in figure 8, using abnormal pixel surrounding pixel intensity average value as the intrinsic brilliance of the abnormal pixel, then with described The intrinsic brilliance of abnormal pixel participates in the mura compensation value calculations of fixed setting spaced pixels, the intrinsic brilliance of the abnormal pixel by Then its surrounding pixel intensity average value, therefore, abnormal pixel for calculating very small with surrounding pixel brightness value difference The mura offsets calculated when the vertex position mura offsets in residing fixed intervals region are with being not present abnormal pixel still become Unanimously.Therefore, abnormal pixel does not interfere with the mean flow rate of all pixels in any region comprising including it, then calculates Fixed setting interval summit pixel mura offsets will not occur because of the presence of abnormal pixel it is bigger than normal/small, in TCON IC The mura offsets of rest of pixels still tend to be normal in the fixed intervals that portion's linear interpolation calculates.

S5, according to the mura offsets liquid crystal panel is compensated;

Because the step S4 mura offsets calculated are not influenceed by abnormal pixel, the mura offsets are carried out to LCD Be not in that fixed intervals region entirety brightness where abnormal pixel is partially light/dark after mura compensation, cause zonal vision Effect is bad.

Corresponding to the embodiment of the present invention one, the embodiment of the present invention two provides a kind of mura compensation devices of liquid crystal panel, bag Include:

Acquisition module, the image for shooting to obtain to the liquid crystal panel for acquisition;

Judge module, for judging to whether there is abnormal pixel in described image;

Processing module, for when the judge module judges abnormal pixel to be present in described image, using the abnormal pixel as Center, the average brightness to set all pixels in pixel region in addition to the abnormal pixel are used as the abnormal pixel Intrinsic brilliance;

Computing module, for liquid crystal panel described in the intrinsic brilliance and the brightness calculation of normal pixel according to the abnormal pixel Mura offsets;

Compensating module, for being compensated according to the mura offsets to the liquid crystal panel.

Wherein, the judge module is specifically used for brightness of the brightness with its surrounding location of pixels for judging a certain location of pixels Whether difference exceedes judgment threshold, if the pixel for then judging this position is abnormal pixel.

Wherein, the judge module judge the brightness of a certain location of pixels and its surrounding location of pixels luminance difference whether More than judgment threshold, it is specifically:

Judge the brightness of the pixel, with centered on the position of the pixel, with least 5 × 5 pixel regions in addition to the pixel All pixels average brightness between difference whether exceed the judgment threshold.

Wherein, the pixel region that sets is 5 × 5 pixel region.

By described above, the beneficial effect of the embodiment of the present invention is:For bright, dim spot panel be present, or Have on person's backlight module BLU under the dirty situation of point-like, avoid going to calculate offset data using conventional gamma gamma, and It is by judging abnormal pixel and calculating its intrinsic brilliance, carry out certain mura repairings, is not in abnormal benefit bigger than normal/small Data are repaid, do not interfere with the display effect of bright, dim spot and dirty peripheral region, avoid the occurrence of regional bright, dark heterogeneity situation.

Above disclosure is only preferred embodiment of present invention, can not limit the right model of the present invention with this certainly Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.

Claims (8)

1. a kind of mura compensation methodes of liquid crystal panel, including:
The image that acquisition shoots to obtain to the liquid crystal panel;
Judge to whether there is abnormal pixel in described image;
If abnormal pixel in described image be present, centered on the abnormal pixel, to set in pixel region except described Intrinsic brilliance of the average brightness of all pixels beyond abnormal pixel as the abnormal pixel;
The mura offsets of liquid crystal panel according to the brightness calculation of the intrinsic brilliance of the abnormal pixel and normal pixel;
The liquid crystal panel is compensated according to the mura offsets.
2. mura compensation methodes according to claim 1, it is characterised in that with the presence or absence of different in the judgement described image Normal pixel specifically includes:
Judge whether the brightness of a certain pixel exceedes judgment threshold with the luminance difference of its surrounding pixel, if then judging this pixel For abnormal pixel.
3. mura compensation methodes according to claim 2, it is characterised in that the brightness for judging a certain pixel with its four Whether the luminance difference of all pixels exceedes judgment threshold, is specifically:
Judge the brightness of the pixel, with centered on the pixel, with all in addition to the pixel at least 5 × 5 pixel regions Whether the difference between the average brightness of pixel exceedes the judgment threshold.
4. mura compensation methodes according to claim 1, it is characterised in that the pixel region that sets is 5 × 5 pixel region Domain.
A kind of 5. mura compensation devices of liquid crystal panel, it is characterised in that including:
Acquisition module, the image for shooting to obtain to the liquid crystal panel for acquisition;
Judge module, for judging to whether there is abnormal pixel in described image;
Processing module, for when the judge module judges abnormal pixel to be present in described image, using the abnormal pixel as Center, the average brightness to set all pixels in pixel region in addition to the abnormal pixel are used as the abnormal pixel Intrinsic brilliance;
Computing module, for liquid crystal panel described in the intrinsic brilliance and the brightness calculation of normal pixel according to the abnormal pixel Mura offsets,
Compensating module, for being compensated according to the mura offsets to the liquid crystal panel.
6. mura compensation devices according to claim 5, it is characterised in that the judge module is a certain specifically for judging Whether the brightness of pixel and the luminance difference of its surrounding pixel exceed judgment threshold, if then judging this pixel for abnormal pixel.
7. mura compensation devices according to claim 6, it is characterised in that the judge module judges the bright of a certain pixel Whether degree and the luminance difference of its surrounding pixel exceed judgment threshold, are specifically:
Judge the brightness of the pixel, with centered on the pixel, with all in addition to the pixel at least 5 × 5 pixel regions Whether the difference between the average brightness of pixel exceedes the judgment threshold.
8. mura compensation devices according to claim 5, it is characterised in that the pixel region that sets is 5 × 5 pixel region Domain.
CN201711167291.3A 2017-11-21 2017-11-21 A kind of mura compensation methodes and device CN107731194A (en)

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Application Number Priority Date Filing Date Title
CN201711167291.3A CN107731194A (en) 2017-11-21 2017-11-21 A kind of mura compensation methodes and device
PCT/CN2017/114534 WO2019100443A1 (en) 2017-11-21 2017-12-05 Mura compensation method and device

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CN104992657A (en) * 2015-07-27 2015-10-21 京东方科技集团股份有限公司 Mura compensation module and method, display device and method
CN106847157A (en) * 2017-03-24 2017-06-13 上海天马有机发光显示技术有限公司 The luminance compensation method and device of a kind of display panel

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WO2010147293A1 (en) * 2009-06-15 2010-12-23 엘지전자 주식회사 Display device
CN102025952B (en) * 2010-11-19 2012-07-18 广东威创视讯科技股份有限公司 Brightness correction method and system for display device
CN105070273B (en) * 2015-09-02 2017-07-28 深圳市华星光电技术有限公司 The luminance compensation method in Mura regions and the design method of Mura pixel brightness
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080107328A1 (en) * 2006-11-03 2008-05-08 Liang-Chia Chen Non-uniform Image Defect Inspection Method
CN103218961A (en) * 2013-03-22 2013-07-24 苏州领视测控科技有限公司 Method and system for liquid crystal display (LCD) defect online detection
CN103489405A (en) * 2013-09-30 2014-01-01 京东方科技集团股份有限公司 Method, device and system for compensating displaying
CN104992657A (en) * 2015-07-27 2015-10-21 京东方科技集团股份有限公司 Mura compensation module and method, display device and method
CN106847157A (en) * 2017-03-24 2017-06-13 上海天马有机发光显示技术有限公司 The luminance compensation method and device of a kind of display panel

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