CN110992887A - Mura compensation data acquisition method and device and display device - Google Patents
Mura compensation data acquisition method and device and display device Download PDFInfo
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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Abstract
The invention discloses a Mura compensation data acquisition method, a Mura compensation data acquisition device and a display device. The Mura compensation data acquisition method comprises the following steps: acquiring a first white image, a first red image, a first green image and a first blue image of a display panel under a preset gray scale; determining a Mura region of the display panel based on the first white image; dividing a compensation area of the display panel; performing three-primary color separation on the first white image in the compensation area; respectively carrying out Mura correction on each image positioned in the compensation area; respectively synthesizing the images which are subjected to Mura correction and located in the compensation area into a second white image and a third white image; and determining the white image with better compensation effect as a compensation white image based on the second white image and the third white image, and acquiring Mura compensation data corresponding to the compensation white image. The embodiment of the invention can improve the Mura compensation effect of the display panel.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a Mura compensation data acquisition method, a Mura compensation data acquisition device and a display device.
Background
The Organic Light-Emitting Diode (OLED) display panel has a problem of poor brightness uniformity, i.e., Mura phenomenon. When compensating for Mura, it is necessary to acquire the light emission luminance of the display panel and calculate Mura compensation data from the light emission luminance. However, the existing technical solution has limitations on the Mura compensation of the display panel, and has a problem of poor Mura compensation effect.
Disclosure of Invention
In view of the above, the present invention provides a Mura compensation data obtaining method, device and display device to improve the Mura compensation effect of the display panel.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a Mura compensation data obtaining method, including:
acquiring a first white image, a first red image, a first green image and a first blue image of a display panel under a preset gray scale;
determining a Mura region of the display panel based on the first white image;
dividing a compensation area of the display panel, wherein the compensation area covers the Mura area;
performing three-primary-color separation on the first white image in the compensation area, and extracting a second red image, a second green image and a second blue image;
performing Mura correction on the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image located in the compensation region respectively;
synthesizing the first red image, the first green image and the first blue image which are subjected to Mura correction and located in the compensation area into a second white image, and synthesizing the second red image, the second green image and the second blue image which are subjected to Mura correction into a third white image;
and determining the white image with better compensation effect as a compensation white image based on the second white image and the third white image, and acquiring Mura compensation data corresponding to the compensation white image.
Optionally, dividing the compensation area of the display panel includes:
and forming a rectangular region covering the Mura region by taking the center of the Mura region as a center, wherein the rectangular region is the compensation region and the area of the rectangular region is larger than that of the Mura region.
Optionally, performing Mura correction on the second red image, the second green image, the second blue image, and the first red image, the first green image, and the first blue image located in the compensation region, respectively, includes:
respectively acquiring actual brightness values of corresponding sub-pixels in the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image which are positioned in the compensation area;
calculating an ideal brightness value of each sub-pixel based on a preset gamma curve;
determining a compensation brightness value of each sub-pixel according to the actual brightness value and the ideal brightness value of each sub-pixel;
and performing Mura correction on the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image in the compensation area by using the compensation brightness value of each sub-pixel.
Optionally, calculating the ideal brightness value of each sub-pixel based on a preset gamma curve includes:
the ideal luminance value of a sub-pixel is calculated by the following formula:
wherein L is the sub-pixel theoryA desired brightness value; x is the preset gray scale; l is0The maximum brightness value which can be reached by the display panel; gamma is a gamma value.
Optionally, determining a white image with a better compensation effect as a compensation white image based on the second white image and the third white image, and obtaining Mura compensation data corresponding to the compensation white image, including:
acquiring actual brightness values of the sub-pixels corresponding to the second white image and the third white image;
calculating ideal luminance values of corresponding sub-pixels in the second white image and the third white image according to the maximum luminance values of the second white image and the third white image;
calculating the standard deviation of the brightness of the second white image and the third white image according to the actual brightness value and the ideal brightness value of each corresponding sub-pixel in the second white image and the third white image respectively;
determining, as the compensated white image, one of the second white image and the third white image whose standard deviation of brightness is smaller;
acquiring Mura compensation data corresponding to the compensation white image;
wherein the standard deviation of luminance satisfies the following formula:
R＝{[(L1-L'1)2+(L2-L'2)2+…+(Ln-L'n)2]/n}1/2；
wherein R is the standard deviation of the brightness; l is1、L2、…LnActual luminance values for corresponding sub-pixels in the second white image and the third white image; l'1、L'2、…L'nThe ideal brightness value of each corresponding sub-pixel in the second white image and the third white image; n is the number of corresponding sub-pixels in the second white image and the third white image.
Optionally, after determining a white compensation image with a better compensation effect based on the second white image and the third white image, and obtaining Mura compensation data corresponding to the white compensation image, the method further includes:
acquiring a fourth white image of the display panel after Mura compensation under a preset gray scale;
determining a brightness uniformity deviation of the fourth white image from the compensated white image;
when the brightness uniformity deviation is larger than a preset value, expanding the compensation area to form a new compensation area, returning to perform three-primary-color separation on the first white image in the new compensation area, and extracting a second red image, a second green image and a second blue image until the brightness uniformity deviation is smaller than or equal to the preset value;
and taking Mura compensation data corresponding to the compensation white image when the brightness uniformity deviation is less than or equal to the preset value as final Mura compensation data.
Optionally, the distance that the compensation zone expands outward is positively correlated with the luminance uniformity deviation.
Optionally, determining the luminance uniformity deviation of the fourth white image from the compensated white image comprises:
acquiring actual brightness values of the sub-pixels corresponding to the fourth white image;
determining a first average brightness value of the fourth white image according to the actual brightness value of each sub-pixel corresponding to the fourth white image;
determining a second average luminance value of the compensated white image;
determining the brightness uniformity deviation according to a difference between the first average brightness value and the second average brightness value.
In a second aspect, an embodiment of the present invention provides a Mura compensation data obtaining apparatus, including:
the image acquisition module is used for acquiring a first white image, a first red image, a first green image and a first blue image of the display panel under a preset gray scale;
a Mura region determination module to determine a Mura region of the display panel based on the first white image;
a compensation region dividing module, configured to divide a compensation region of the display panel, where the compensation region covers the Mura region;
the image separation module is used for carrying out three-primary-color separation on the first white image in the compensation area and extracting a second red image, a second green image and a second blue image;
an image compensation module, configured to perform Mura correction on the second red image, the second green image, the second blue image, and the first red image, the first green image, and the first blue image located in the compensation region, respectively;
the image synthesis module is used for synthesizing the first red image, the first green image and the first blue image which are subjected to Mura correction and positioned in the compensation area into a second white image, and synthesizing the second red image, the second green image and the second blue image subjected to Mura correction into a third white image;
and the Mura compensation data acquisition module is used for acquiring Mura compensation data with better compensation effect based on the second white image and the third white image.
In a third aspect, an embodiment of the present invention provides a display apparatus, including a storage device, where the Mura compensation data obtained by the Mura compensation data obtaining method provided in any embodiment is stored on the storage device.
According to the technical scheme of the embodiment of the invention, on one hand, a first red image, a first green image and a first blue image of the display panel under a preset gray scale are obtained, and a second white image is synthesized after Mura compensation is carried out on the first red image, the first green image and the first blue image which are positioned in a compensation area; on the other hand, a first white image of the display panel under a preset gray scale is obtained, three primary colors of the first white image in the compensation area are separated to obtain a second red image, a second green image and a second blue image, and a third white image is synthesized after Mura correction is carried out on the second red image, the second green image and the second blue image; and finally, determining the white image with better compensation effect as a compensation white image from the second white image and the third white image, and acquiring Mura compensation data corresponding to the compensation white image. Therefore, the Mura compensation data can be used for carrying out Mura compensation on the sub-pixels in the compensation area of the display panel, and the Mura compensation precision of the display panel is improved, so that the brightness uniformity of the display panel is improved.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:
fig. 1 is a schematic flow chart of a Mura compensation data obtaining method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a position relationship between a Mura region and a compensation region of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic view of a detailed flow chart of S150 in FIG. 1;
FIG. 4 is a schematic view of a detailed flow chart of S170 in FIG. 1;
fig. 5 is a schematic flow chart of another Mura compensation data obtaining method according to an embodiment of the present invention;
fig. 6 is a block diagram of a Mura compensation data obtaining apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The Organic Light-Emitting Diode (OLED) display panel includes a plurality of OLED devices, and when the OLED devices are manufactured, the process has a certain precision, so that the plurality of OLED devices manufactured in the same process have a certain difference. When the OLED display panel displays, the difference between the plurality of OLED devices indicates that there is a difference in the light emitting brightness, thereby causing uneven display of the OLED display panel, i.e., Mura phenomenon. In order to improve the brightness uniformity of the OLED display panel, the brightness of the sub-pixels in the Mura region of the OLED display panel may be compensated.
As described in the background art, there is a problem in the prior art that the Mura compensation effect is not good. The inventor has found that the root cause of the above problem is that there may be a large difference in luminance data corresponding to the Mura regions of different display panels or different Mura regions of the same display panel, and a single Mura compensation method is used to perform luminance compensation on different Mura regions, so that a part of the Mura regions is not suitable for the Mura compensation method, and the Mura compensation of the part of the Mura regions is poor.
Based on the above technical problem, the present embodiment provides the following solutions:
fig. 1 is a schematic flowchart of a Mura compensation data obtaining method according to an embodiment of the present invention, where the method is applicable to a case of performing Mura compensation on a Mura area of a display panel, and the method may be executed by a Mura compensation data obtaining apparatus, where the Mura compensation data obtaining apparatus may be implemented in a software and/or hardware manner, and the Mura compensation data obtaining apparatus may be configured in a display apparatus. As shown in fig. 1, the Mura compensation data obtaining method includes:
s110, acquiring a first white image, a first red image, a first green image and a first blue image of the display panel under a preset gray scale.
Generally, pixels arranged in an array are disposed on a display panel, each pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the red sub-pixel can emit red light, the green sub-pixel can emit green light, and the blue sub-pixel can emit blue light. Each sub-pixel on the display panel may display a different brightness level, i.e. a gray scale, which represents a gradation level of different brightness from the darkest to the brightest.
The preset gray scale in this embodiment may be any one of gray scales from 0 to 255, the first white image, the first red image, the first green image and the first blue image are display images of the display panel at the same preset gray scale, and the first white image, the first red image, the first green image and the first blue image may be acquired by using an image acquisition Device, such as a Charge Coupled Device (CCD).
Specifically, driving data corresponding to a preset gray scale is provided for each of the red sub-pixel, the green sub-pixel and the blue sub-pixel through a driving chip of the display panel to display a white image, and at this time, a display image of the display panel can be photographed by using a CCD to obtain a first white image; driving data corresponding to a preset gray scale is provided for each red sub-pixel through a driving chip so as to display a red image, and at the moment, a display image of a display panel can be photographed by adopting a CCD (charge coupled device) to obtain a first red image; driving data corresponding to a preset gray scale is provided for each green sub-pixel through a driving chip so as to display a green image, and at the moment, a display image of a display panel can be photographed by adopting a CCD (charge coupled device) to obtain a first green image; and providing driving data corresponding to the preset gray scale for each blue sub-pixel through the driving chip so as to display a blue image, and at the moment, photographing the display image of the display panel by adopting the CCD to obtain a first blue image.
And S120, determining a Mura area of the display panel based on the first white image.
Because the display image of the display panel is displayed after the light emitted by the red sub-pixel, the green sub-pixel and the blue sub-pixel is mixed, the display image of a single color is displayed unevenly in a certain area and cannot reflect that the mixed light is still displayed unevenly in the area, and therefore, the Mura area of the display panel determined based on the first white image is more accurate.
Specifically, when the CCD is used to obtain the first white image of the display panel at the preset gray scale, the actual brightness value of each sub-pixel corresponding to the first white image may also be obtained. In this embodiment, a two-dimensional orthogonal coordinate system is established with the center of the display area of the display panel as an origin, so that the actual brightness value of each sub-pixel corresponding to the first white image corresponds to the position of each sub-pixel on the display panel one by one; calculating an average brightness value corresponding to the first white image according to the actual brightness value of each sub-pixel corresponding to the first white image, wherein the average brightness value corresponding to the first white image is the average value of the actual brightness values of all the sub-pixels corresponding to the first white image; and calculating the difference value between the actual brightness value of each sub-pixel corresponding to the first white image and the average brightness value corresponding to the first white image, and determining that the area with the difference value larger than a preset threshold value is the Mura area of the display panel.
And S130, dividing a compensation area of the display panel.
Referring to fig. 2, the compensation region B covers the Mura region a. The compensation region B is a region actually requiring Mura compensation, and the compensation region B completely overlaps with the Mura region a, or a part of the compensation region B completely covers the Mura region a, that is, the Mura region a is located within the compensation region B. It is understood that fig. 2 only schematically shows the position relationship between the compensation region B and the Mura region a, the shape of the outer contour of the Mura region a may be defined by the actually determined Mura region, and is not limited to the illustrated rectangle, and alternatively, the Mura region may be a block or a belt; the compensation region B may be any shape such as a rectangle, a circle, or a trapezoid, as long as it covers the Mura region a, so as to ensure the compensation of the Mura region a.
In a preferred embodiment of the present invention, a rectangular region covering the Mura region is formed by taking the center (geometric center) of the Mura region as the center, wherein the rectangular region is a compensation region and the area of the rectangular region is larger than that of the Mura region. Therefore, a rectangular compensation region is divided based on the center of the Mura region, the image processing speed can be improved, and the acquisition efficiency of Mura compensation data is improved; meanwhile, the area of the compensation region is larger than that of the Mura region, so that a brightness transition region is formed in a region, between the Mura region and a normal display region (non-Mura region), of the compensation region, the display brightness of the normal display region is smoothly transited to the display brightness of the Mura region, and the uniformity of the whole display is further improved.
And S140, performing three-primary-color separation on the first white image in the compensation area, and extracting a second red image, a second green image and a second blue image.
Illustratively, the first white image in the compensation area is cut, and three primary colors of each pixel in the first white image in the compensation area are separated through image processing, so as to obtain a second red image, a second green image and a second blue image.
And S150, performing Mura correction on the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image in the compensation area respectively.
In this embodiment, the second red image, the second green image and the second blue image are obtained by processing the first white image, and the first red image, the first green image and the first blue image are directly captured, so that actual luminance values of sub-pixels at the same position corresponding to the same color image are different, and Mura compensation data of sub-pixels at the same position corresponding to the same color image are different.
Optionally, in an embodiment of the present invention, as shown in fig. 3, performing Mura correction on the second red image, the second green image, the second blue image, and the first red image, the first green image, and the first blue image located in the compensation region, respectively, includes:
and S151, respectively acquiring actual brightness values of the sub-pixels corresponding to the second red image, the second green image, the second blue image, the first red image, the first green image and the first blue image in the compensation area.
When the first red image, the first green image and the first blue image are obtained through CCD shooting, the actual brightness values of the sub-pixels corresponding to the first red image, the first green image and the first blue image can be obtained, and therefore the actual brightness values of the sub-pixels corresponding to the first red image, the first green image and the first blue image in the compensation area can be obtained. In addition, when the first white image is separated into the second red image, the second green image, and the second blue image, the actual luminance values corresponding to the sub-pixels in the second red image, the second green image, and the second blue image may be determined according to the actual luminance corresponding to the sub-pixels in the first white image and the luminance relationship configured by the separated three primary colors.
S152, calculating the ideal brightness value of each sub-pixel based on a preset gamma curve.
Specifically, the ideal luminance value of a sub-pixel can be calculated by the following formula:
wherein, L is an ideal brightness value of the sub-pixel; x is a preset gray scale; l is0The maximum brightness value that can be reached by the display panel; gamma is a gamma value. The maximum brightness value that can be achieved by the display panel is determined by the design requirements of the display panel, and γ can be 2.2.
And S153, determining the compensation brightness value of each sub-pixel according to the actual brightness value and the ideal brightness value of each sub-pixel.
And taking the difference value between the actual brightness value and the ideal brightness value of each sub-pixel as the compensation brightness value of each sub-pixel.
And S154, carrying out Mura correction on the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image positioned in the compensation area by using the compensation brightness value of each sub-pixel.
And S160, synthesizing the first red image, the first green image and the first blue image which are subjected to Mura correction and positioned in the compensation area into a second white image, and synthesizing the second red image, the second green image and the second blue image which are subjected to Mura correction into a third white image.
And S170, determining the white image with better compensation effect as a compensation white image based on the second white image and the third white image, and acquiring Mura compensation data corresponding to the compensation white image.
In this step, the white image with better compensation effect is selected from the second white image and the third white image to be used as the compensation white image, namely, the white image with better compensation effect is determined to be used as the compensation white image by comparing the actual display effect (brightness uniformity) of the second white image and the third white image, so that Mura compensation data corresponding to the compensation white image is obtained, Mura compensation is carried out on the compensation area of the display panel, a single Mura compensation mode is avoided, the applicability of Mura compensation is improved, and the Mura compensation effect of the display panel is further improved. In addition, the embodiment of the invention only carries out Mura compensation on the sub-pixels in the compensation area of the display panel by dividing the compensation area, thereby reducing the storage space occupied by Mura compensation data and improving the Mura compensation efficiency.
Optionally, in an embodiment of the present invention, as shown in fig. 4, determining, as the compensation white image, a white image with a better compensation effect based on the second white image and the third white image, and acquiring Mura compensation data corresponding to the compensation white image includes:
and S171, acquiring actual brightness values of the sub-pixels corresponding to the second white image and the third white image.
And S172, calculating ideal brightness values corresponding to the sub-pixels in the second white image and the third white image according to the maximum brightness values of the second white image and the third white image.
Specifically, the formula for calculating the ideal luminance value may refer to the formula in step S152.
And S173, calculating the standard deviation of the brightness of the second white image and the third white image according to the actual brightness value and the ideal brightness value of each corresponding sub-pixel in the second white image and the third white image respectively.
Wherein the standard deviation of luminance satisfies the following formula:
R＝{[(L1-L'1)2+(L2-L'2)2+…+(Ln-L'n)2]/n}1/2；
wherein R is the standard deviation of brightness; l is1、L2、…LnActual brightness values of the corresponding sub-pixels in the second white image and the third white image are obtained; l'1、L'2、…L'nThe ideal brightness of each sub-pixel in the second white image and the third white imageA value; and n is the number of corresponding sub-pixels in the second white image and the third white image.
And S174, determining the second white image and the third white image with smaller standard deviation of brightness as a compensation white image.
And S175, acquiring Mura compensation data corresponding to the compensation white image.
According to the technical scheme of the embodiment, on one hand, a first red image, a first green image and a first blue image of the display panel under a preset gray scale are obtained, and a second white image is synthesized after Mura correction is carried out on the first red image, the first green image and the first blue image which are positioned in a compensation area; on the other hand, a first white image of the display panel under a preset gray scale is obtained, three primary colors of the first white image in the compensation area are separated to obtain a second red image, a second green image and a second blue image, and a third white image is synthesized after Mura correction is carried out on the second red image, the second green image and the second blue image; and finally, determining the white image with better compensation effect as a compensation white image from the second white image and the third white image, and acquiring Mura compensation data corresponding to the compensation white image. Therefore, the Mura compensation data can be used for carrying out Mura compensation on the sub-pixels in the compensation area of the display panel, and the Mura compensation precision of the display panel is improved, so that the brightness uniformity of the display panel is improved.
Optionally, based on the above technical solution, after determining, as the compensation white image, the white image with a better compensation effect based on the second white image and the third white image, and obtaining Mura compensation data corresponding to the compensation white image, the method further includes: acquiring a fourth white image of the display panel after Mura compensation under a preset gray scale; determining a brightness uniformity deviation of the fourth white image from the compensated white image; when the brightness uniformity deviation is larger than a preset value, expanding the compensation area to form a new compensation area, returning to perform three-primary-color separation on the first white image in the new compensation area, and extracting a second red image, a second green image and a second blue image until the brightness uniformity deviation is smaller than or equal to the preset value; and taking Mura compensation data corresponding to the compensation white image when the brightness uniformity deviation is less than or equal to a preset value as final Mura compensation data.
Specifically, fig. 5 is a flowchart illustrating another Mura compensation data obtaining method according to an embodiment of the present invention. As shown in fig. 5, the Mura compensation data obtaining method may include:
s210, acquiring a first white image, a first red image, a first green image and a first blue image of the display panel under a preset gray scale.
And S220, determining a Mura area of the display panel based on the first white image.
And S230, dividing a compensation area of the display panel.
S240, performing three-primary-color separation on the first white image in the compensation area, and extracting a second red image, a second green image and a second blue image.
And S250, respectively carrying out Mura correction on the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image which are positioned in the compensation area.
And S260, synthesizing the first red image, the first green image and the first blue image which are subjected to Mura correction and positioned in the compensation area into a second white image, and synthesizing the second red image, the second green image and the second blue image which are subjected to Mura correction into a third white image.
And S270, determining the white image with better compensation effect as a compensation white image based on the second white image and the third white image, and acquiring Mura compensation data corresponding to the compensation white image.
S280, acquiring a fourth white image of the display panel after Mura compensation under the preset gray scale.
For example, the fourth white image may be obtained by performing Mura compensation on the compensation region based on the first white image.
And S290, determining the brightness uniformity deviation of the fourth white image and the compensation white image.
In consideration of the uniformity of the overall display luminance of the display panel, after performing Mura compensation on the compensation region, it may be further detected whether the luminance of the compensation region is equalized with the luminance of the other display regions (normal display regions), and therefore, the present embodiment judges the luminance uniformity of the entire display region by determining the luminance uniformity deviation of the fourth white image and the compensation white image.
Specifically, acquiring actual brightness values of the sub-pixels corresponding to the fourth white image; determining a first average brightness value of the fourth white image according to the actual brightness value of each sub-pixel corresponding to the fourth white image; determining a second average luminance value of the compensated white image; the brightness uniformity deviation is determined according to the difference between the first average brightness value and the second average brightness value, i.e. the difference between the first average brightness value and the second average brightness value is used to represent the magnitude of the brightness uniformity deviation.
S300, judging whether the brightness uniformity deviation is larger than a preset value.
The preset value can be obtained according to an empirical value or through testing and simulation debugging, and the preset value is a critical value for judging whether the requirement of brightness uniformity is met. The predetermined value may be a brightness value, that is, the step may be determining whether a difference between the first average brightness value and the second average brightness value is greater than a predetermined brightness value.
In this embodiment, if the brightness uniformity deviation is greater than the preset value, S310 is executed; if the deviation of the brightness uniformity is less than or equal to the preset value, S320 is performed.
S310, expanding the compensation area and returning to execute S240.
Illustratively, the original compensation region may be expanded outward in at least one direction based on the original compensation region. The direction and distance of the outward expansion of the compensation region can be determined according to the position of the compensation region in the display region and/or the brightness uniformity deviation, for example, when the compensation region is located in the middle of the display region, the compensation region can be expanded to all directions, and the expanded distance can be equal; when the compensation area is located at the edge of the display area, the compensation area can be expanded towards the direction not close to the edge or can be expanded towards all directions, but the distance expanded towards the direction not close to the edge is larger than the distance expanded towards the direction close to the edge.
Alternatively, the distance of the compensation zone flare is positively correlated to the luminance uniformity deviation. When the deviation of the brightness uniformity is large, that is, when the brightness difference from the normal display area to the compensation area is large, the outward expansion distance of the compensation area can be increased, so that the display brightness of the normal display area smoothly transits to the display brightness of the compensation area. Conversely, when the luminance uniformity deviation is small, the distance by which the compensation region expands outward is small, and the display luminance of the normal display region can be smoothly transitioned to the display luminance of the compensation region. The distance of the outward expansion of the compensation region is not limited in this embodiment, and may be determined according to specific situations.
And S320, taking Mura compensation data corresponding to the compensation white image when the brightness uniformity deviation is less than or equal to a preset value as final Mura compensation data.
In the embodiment, by detecting the uniformity of the overall brightness of the display area of the display panel, when the brightness uniformity is poor, the original compensation area is expanded, and Mura compensation is further performed on the new compensation area after the expansion, so that the display brightness of the normal display area smoothly transits to the display brightness of the compensation area, and the uniformity of the overall brightness of the display area of the display panel is improved.
The embodiment of the invention also provides a Mura compensation data acquisition device. Fig. 6 is a block diagram of a Mura compensation data obtaining apparatus according to an embodiment of the present invention. As shown in fig. 6, the Mura compensation data obtaining apparatus includes:
the image obtaining module 10 is configured to obtain a first white image, a first red image, a first green image and a first blue image of the display panel at a preset gray scale;
a Mura region determining module 20 for determining a Mura region of the display panel based on the first white image;
a compensation region dividing module 30, configured to divide a compensation region of the display panel, where the compensation region covers the Mura region;
the image separation module 40 is configured to perform three-primary-color separation on the first white image in the compensation region, and extract a second red image, a second green image, and a second blue image;
an image compensation module 50, configured to perform Mura correction on the second red image, the second green image, the second blue image, and the first red image, the first green image, and the first blue image located in the compensation region, respectively;
the image synthesizing module 60 is configured to synthesize the first red image, the first green image, and the first blue image, which are subjected to the Mura correction and located in the compensation region, into a second white image, and synthesize the second red image, the second green image, and the second blue image, which are subjected to the Mura correction, into a third white image;
a Mura compensation data obtaining module 70, configured to obtain Mura compensation data with a better compensation effect based on the second white image and the third white image.
The Mura compensation data acquisition apparatus provided in this embodiment of the present invention is the same as the Mura compensation data acquisition method provided in any embodiment of the present invention, and may perform the Mura compensation data acquisition method provided in any embodiment of the present invention, and has corresponding functions and advantageous effects. For details of the Mura compensation data acquisition method provided in any embodiment of the present invention, reference may be made to the technical details not described in detail in this embodiment.
On the basis of the above technical solution, the compensation region dividing module 30 is specifically configured to:
and forming a rectangular region covering the Mura region by taking the center of the Mura region as a center, wherein the rectangular region is a compensation region and the area of the rectangular region is larger than that of the Mura region.
Optionally, the image compensation module 50 comprises:
the first actual brightness acquisition unit is used for respectively acquiring actual brightness values of the corresponding sub-pixels in the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image which are positioned in the compensation area;
a first ideal brightness calculation unit for calculating an ideal brightness value of each sub-pixel based on a preset gamma curve;
a compensation brightness determining unit for determining a compensation brightness value of each sub-pixel according to the actual brightness value and the ideal brightness value of each sub-pixel;
and the Mura compensation unit is used for carrying out Mura correction on the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image which are positioned in the compensation area by using the compensation brightness value of each sub-pixel.
Optionally, the ideal luminance value of the sub-pixel is calculated by the following formula:
wherein, L is an ideal brightness value of the sub-pixel; x is a preset gray scale; l is0The maximum brightness value that can be reached by the display panel; gamma is a gamma value.
Optionally, the Mura compensation data obtaining module 70 includes:
a second actual luminance acquiring unit configured to acquire actual luminance values of the respective sub-pixels in the second white image and the third white image;
a second ideal luminance calculating unit for calculating ideal luminance values corresponding to the respective sub-pixels in the second white image and the third white image based on maximum luminance values of the second white image and the third white image;
a luminance standard deviation calculating unit for calculating luminance standard deviations of the second white image and the third white image, respectively, based on actual luminance values and ideal luminance values of the corresponding sub-pixels in the second white image and the third white image;
a luminance standard deviation comparing unit for determining a luminance standard deviation smaller in the second white image and the third white image as a compensated white image;
the Mura compensation data acquisition unit is used for acquiring Mura compensation data corresponding to the compensation white image;
wherein the standard deviation of luminance satisfies the following formula:
R＝{[(L1-L'1)2+(L2-L'2)2+...+(Ln-L'n)2]/n}1/2；
wherein R is the standard deviation of brightness; l is1、L2、…LnActual brightness values of the corresponding sub-pixels in the second white image and the third white image are obtained; l'1、L'2、…L'nThe ideal brightness value of each corresponding sub-pixel in the second white image and the third white image is obtained; and n is the number of corresponding sub-pixels in the second white image and the third white image.
Optionally, based on the foregoing technical solution, the Mura compensation data obtaining apparatus further includes:
the white image obtaining module is used for determining a white image with a better compensation effect as a compensation white image based on the second white image and the third white image, obtaining Mura compensation data corresponding to the compensation white image, and obtaining a fourth white image of the display panel after Mura compensation under a preset gray scale;
a brightness uniformity determining module for determining a brightness uniformity deviation of the fourth white image from the compensated white image;
the brightness uniformity judging module is used for judging whether the brightness uniformity deviation is greater than a preset value;
the compensation area outward expansion module is used for outward expanding the compensation area when the brightness uniformity deviation is larger than a preset value;
the repeated execution module is used for forming a new compensation area in the outward expansion compensation area, then returning to execute the three-primary-color separation of the first white image in the new compensation area, and extracting the second red image, the second green image and the second blue image until the brightness uniformity deviation is less than or equal to a preset value;
and the Mura compensation data determining module is used for taking the Mura compensation data corresponding to the compensation white image when the brightness uniformity deviation is less than or equal to a preset value as final Mura compensation data.
Alternatively, the distance of the compensation zone flare is positively correlated to the luminance uniformity deviation.
Optionally, the brightness uniformity determining module comprises:
a third actual brightness acquiring unit, configured to acquire an actual brightness value of each sub-pixel corresponding to the fourth white image;
a luminance average value calculation unit for determining a first average luminance value of the fourth white image from actual luminance values of the sub-pixels corresponding to the fourth white image; and determining a second average luminance value of the compensated white image by the luminance average value calculating unit;
a luminance uniformity determining unit for determining a luminance uniformity deviation according to a difference between the first average luminance value and the second average luminance value.
In addition, the embodiment of the invention also provides a display device. Fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 7, the display apparatus 100 includes a storage device 101, and the storage device 101 stores compensation data of the display panel obtained by the compensation method of the display panel according to any embodiment of the present invention. When the display apparatus 100 displays, the driving chip 102 of the display apparatus 100 obtains the Mura compensation data from the storage device 101, and sums the Mura compensation data with the driving data to obtain a driving signal for the display apparatus 100 to drive the pixels to emit light. Since the Mura compensation data is highly accurate, the Mura compensation accuracy of the display apparatus 100 can be improved, and the luminance uniformity of the display apparatus 100 can be improved.
In this embodiment, the display device 100 may be a display device with a display function, such as a mobile phone, a computer, and an intelligent wearable device, which is not limited in this embodiment of the present invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A Mura compensation data acquisition method is characterized by comprising the following steps:
acquiring a first white image, a first red image, a first green image and a first blue image of a display panel under a preset gray scale;
determining a Mura region of the display panel based on the first white image;
dividing a compensation area of the display panel, wherein the compensation area covers the Mura area;
performing three-primary-color separation on the first white image in the compensation area, and extracting a second red image, a second green image and a second blue image;
performing Mura correction on the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image located in the compensation region respectively;
synthesizing the first red image, the first green image and the first blue image which are subjected to Mura correction and located in the compensation area into a second white image, and synthesizing the second red image, the second green image and the second blue image which are subjected to Mura correction into a third white image;
and determining the white image with better compensation effect as a compensation white image based on the second white image and the third white image, and acquiring Mura compensation data corresponding to the compensation white image.
2. The Mura compensation data acquisition method of claim 1, wherein dividing the compensation area of the display panel comprises:
and forming a rectangular region covering the Mura region by taking the center of the Mura region as a center, wherein the rectangular region is the compensation region and the area of the rectangular region is larger than that of the Mura region.
3. The Mura compensation data obtaining method of claim 1, wherein performing Mura correction on the second red image, the second green image, the second blue image, and the first red image, the first green image, and the first blue image located in the compensation region respectively comprises:
respectively acquiring actual brightness values of corresponding sub-pixels in the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image which are positioned in the compensation area;
calculating an ideal brightness value of each sub-pixel based on a preset gamma curve;
determining a compensation brightness value of each sub-pixel according to the actual brightness value and the ideal brightness value of each sub-pixel;
and performing Mura correction on the second red image, the second green image, the second blue image and the first red image, the first green image and the first blue image in the compensation area by using the compensation brightness value of each sub-pixel.
4. The Mura compensation data obtaining method of claim 3, wherein calculating the ideal brightness value of each sub-pixel based on a preset gamma curve comprises:
the ideal luminance value of a sub-pixel is calculated by the following formula:
wherein, L is an ideal brightness value of the sub-pixel; x is the preset gray scale; l is0The maximum brightness value which can be reached by the display panel; gamma is a gamma value.
5. The Mura compensation data obtaining method according to claim 4, wherein determining a white image with better compensation effect as the compensation white image based on the second white image and the third white image, and obtaining Mura compensation data corresponding to the compensation white image comprises:
acquiring actual brightness values of the sub-pixels corresponding to the second white image and the third white image;
calculating ideal luminance values of corresponding sub-pixels in the second white image and the third white image according to the maximum luminance values of the second white image and the third white image;
calculating the standard deviation of the brightness of the second white image and the third white image according to the actual brightness value and the ideal brightness value of each corresponding sub-pixel in the second white image and the third white image respectively;
determining, as the compensated white image, one of the second white image and the third white image whose standard deviation of brightness is smaller;
acquiring Mura compensation data corresponding to the compensation white image;
wherein the standard deviation of luminance satisfies the following formula:
R＝{[(L1-L'1)2+(L2-L'2)2+…+(Ln-L'n)2]/n}1/2；
wherein R is the standard deviation of the brightness; l is1、L2、…LnActual luminance values for corresponding sub-pixels in the second white image and the third white image; l'1、L'2、…L'nThe ideal brightness value of each corresponding sub-pixel in the second white image and the third white image; n is the number of corresponding sub-pixels in the second white image and the third white image.
6. The Mura compensation data obtaining method according to claim 1, wherein after determining the white image with better compensation effect as the compensation white image based on the second white image and the third white image, and obtaining the Mura compensation data corresponding to the compensation white image, the method further comprises:
acquiring a fourth white image of the display panel after Mura compensation under a preset gray scale;
determining a brightness uniformity deviation of the fourth white image from the compensated white image;
when the brightness uniformity deviation is larger than a preset value, expanding the compensation area to form a new compensation area, returning to perform three-primary-color separation on the first white image in the new compensation area, and extracting a second red image, a second green image and a second blue image until the brightness uniformity deviation is smaller than or equal to the preset value;
and taking Mura compensation data corresponding to the compensation white image when the brightness uniformity deviation is less than or equal to the preset value as final Mura compensation data.
7. The Mura compensation data acquisition method of claim 6, wherein the distance that the compensation zone expands outward is positively correlated to the brightness uniformity deviation.
8. The Mura compensation data acquisition method of claim 6 wherein determining the brightness uniformity deviation of the fourth white image from the compensated white image comprises:
acquiring actual brightness values of the sub-pixels corresponding to the fourth white image;
determining a first average brightness value of the fourth white image according to the actual brightness value of each sub-pixel corresponding to the fourth white image;
determining a second average luminance value of the compensated white image;
determining the brightness uniformity deviation according to a difference between the first average brightness value and the second average brightness value.
9. A Mura compensation data obtaining apparatus, comprising:
the image acquisition module is used for acquiring a first white image, a first red image, a first green image and a first blue image of the display panel under a preset gray scale;
a Mura region determination module to determine a Mura region of the display panel based on the first white image;
a compensation region dividing module, configured to divide a compensation region of the display panel, where the compensation region covers the Mura region;
the image separation module is used for carrying out three-primary-color separation on the first white image in the compensation area and extracting a second red image, a second green image and a second blue image;
an image compensation module, configured to perform Mura correction on the second red image, the second green image, the second blue image, and the first red image, the first green image, and the first blue image located in the compensation region, respectively;
the image synthesis module is used for synthesizing the first red image, the first green image and the first blue image which are subjected to Mura correction and positioned in the compensation area into a second white image, and synthesizing the second red image, the second green image and the second blue image subjected to Mura correction into a third white image;
and the Mura compensation data acquisition module is used for acquiring Mura compensation data with better compensation effect based on the second white image and the third white image.
10. A display apparatus comprising a storage device having stored thereon Mura compensation data obtained by the Mura compensation data obtaining method according to any one of claims 1 to 8.
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