CN113593479B - Sub-pixel level mura compensation method for display panel - Google Patents
Sub-pixel level mura compensation method for display panel 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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- 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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Abstract
One embodiment of the invention discloses a method for compensating for sub-pixel level mura of a display panel, which comprises the following steps: obtaining a display panel sub-pixel arrangement mode, grouping the display panel sub-pixels, wherein the sub-pixels in each group have the same color and the same offset position, and manufacturing a display template; lightening the display panel according to the display template, and photographing the picture presented by the display panel to obtain a sub-pixel image; moving each sub-pixel image to obtain an offset image, wherein the position of the image of each sub-pixel in each offset image is the same as the logic position; and (5) performing demura processing on the display panel. The invention groups the sub-pixels of the display panel according to the colors and the offset positions, thereby solving the problem of dislocation of physical positions and logical positions of the pixels of different channels.
Description
Technical Field
The invention relates to the field of display screens. And more particularly, to a sub-pixel level mura compensation method of a display panel.
Background
With the development of the OLED (Organic Light-Emitting Diode) technology, screens produced by the OLED technology have occupied an important position in the display field, especially in mobile phone displays and tablet personal computer displays. In the production process of the OLED display, due to material purity, production process and the like, a phenomenon that the same picture is displayed on the same display panel and different pixels (pixel regions) actually have different brightness inevitably occurs. This phenomenon is caused by poor uniformity of the display panel, and is generally called Mura of the display screen. This phenomenon reduces the quality of the display effect of the display and the production yield, and causes a huge burden on the production enterprises. Because the cause of mura is difficult to avoid in production and the cost for avoiding mura is high in production stage, the display effect of the display panel is uniform by a signal control method. The method for making the display effect of the display panel more uniform through signal control is generally called as "demura".
The Demura technique mainly includes two steps of data acquisition and compensation data generation. And a data acquisition step, namely acquiring the actual display brightness of each area of the display through equipment such as a camera, a brightness measuring instrument and the like. This step results in the actual display effect of the display, providing the raw data for the compensation data generation. And a compensation data generation step, wherein the compensation data of each area of the screen is obtained by analyzing the data of the actual display effect of the display. After the compensation data are written into the storage space of the display panel, when the display displays the picture, the display can use the compensation data to correspondingly compensate different areas of the picture and then display the picture. The compensated display results have better uniformity.
In order to improve the apparent resolution of the display panel and take care of the material characteristics of different light emitting materials, the OLED display panel usually adopts a different form of sub-pixel rendering (SPR). In a display panel using the SPR technique, particularly in a display panel using an irregular sub-pixel arrangement, the position of a physical pixel does not strictly correspond to the logical position thereof. To achieve accurate demura, it is necessary to consider the direct difference in the physical pixel locations from the logical locations in the demura process.
Disclosure of Invention
The invention aims to provide a method for compensating the sub-pixel level mura of a display panel. To solve at least one of the problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for compensating for mura at a sub-pixel level of a display panel, comprising:
obtaining a display panel sub-pixel arrangement mode, grouping the display panel sub-pixels, wherein the sub-pixels in each group have the same color and the same offset position, and manufacturing a display template;
lightening the display panel according to the display template, and photographing the picture presented by the display panel to obtain a sub-pixel image;
moving each sub-pixel image to obtain an offset image, wherein the position of the image of each sub-pixel in each offset image is the same as the logic position;
and (5) performing demura processing on the display panel.
In one embodiment, the step of fabricating the display template comprises: determining a gray scale to be shot; and each group of display template sub-pixels are used for manufacturing a corresponding display template aiming at the gray scale to be shot.
In a specific embodiment, the step of grouping the display panel sub-pixels comprises: and grouping the display module sub-pixels for the first time according to the colors, and grouping for the second time according to the offset direction.
In one embodiment, the display panel includes R, G, B subpixels per pixel, wherein at least one subpixel has more than two offset positions relative to a logical position.
In a particular embodiment, the sub-pixels having more than two offset positions have a first sub-pixel offset position and a second sub-pixel offset position with respect to the logical position, the sub-pixel image comprising a first sub-pixel image and a second sub-pixel image.
In a particular embodiment, the method further comprises:
moving the first sub-pixel image having the first sub-pixel shift position in the direction of the second sub-pixel shift position in its entirety by a distance to obtain a first moving image, adding the first moving image to the first sub-pixel image to obtain a first filled image,
moving the first compensation image to obtain a first offset image, wherein the position of the sub-pixel image in the first offset image is the same as the logic position;
moving the second sub-pixel image having the second sub-pixel shift position by the distance in the direction of the first sub-pixel shift position as a whole to obtain a second moving image, adding the second moving image to the second sub-pixel image to obtain a second complementary image,
and performing moving processing on the second compensation image to obtain a second offset image, wherein the position of the image of the sub-pixel in the second offset image is the same as the logic position.
In one particular embodiment of the present invention,
and performing demura algorithm processing on the first offset image and the second offset image to respectively obtain a first processed image and a second processed image.
In one particular embodiment of the present invention,
and performing pixel value alignment on the first processing image and the second processing image, respectively selecting partial areas in the centers of the first processing image and the second processing image, calculating a pixel mean value of the first processing image and a pixel mean value of the second processing image, and further calculating by using the pixel mean value of the first processing image and the pixel mean value of the second processing image to obtain a first alignment image and a second alignment image.
In one particular embodiment of the present invention,
and for the first alignment image and the second alignment image, respectively taking the lighted areas of the pixels in the first display template and the second display template, thereby obtaining the sub-pixel level mura compensation data of the channel with the same color as the first alignment image and the second alignment image.
The invention has the following beneficial effects:
the invention solves the problem of misalignment of the physical and logical positions of pixels of different colors, also called channels (RGB), according to the color grouping. For physical pixels with the same color, the problem of dislocation of the physical positions and the logical positions of the pixels in irregular pixel arrangement is solved according to position grouping, and meanwhile, the problem of data fusion obtained by shooting pictures with the same color for multiple times is also solved. The invention realizes demura compensation at a sub-pixel level, namely a physical pixel level, and eliminates the error introduced by the difference between the physical position and the logical position of the sub-pixel, particularly the influence of the error in irregular sub-pixel arrangement on the display uniformity.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 shows a schematic diagram of a display panel sub-pixel arrangement according to one embodiment of the invention.
FIG. 2 is a flow chart illustrating a method for sub-pixel level mura compensation of a display panel according to an embodiment of the present invention.
FIG. 3(a) shows a pure green sub-pixel template schematic according to one embodiment of the present invention.
FIG. 3(b) shows a pure red sub-pixel template schematic according to one embodiment of the invention.
FIG. 3(c) shows a blue subpixel template in accordance with one embodiment of the present invention.
FIG. 3(d) shows another blue sub-pixel template according to one embodiment of the invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The OLED display panel is generally formed by combining three color sub-pixels of red R, green G, and blue B in a specific sub-pixel arrangement manner. In order to improve the apparent resolution of the display panel and take care of the material characteristics of different light emitting materials, the OLED display panel usually adopts a different form of sub-pixel rendering (SPR). In a display panel using the SPR technique, particularly in a display panel using an irregular subpixel arrangement, the physical positions of subpixels of different colors do not exactly correspond to the logical positions thereof. In order to achieve demura compensation at the sub-pixel level, it is necessary to eliminate errors introduced by differences between physical and logical positions of sub-pixels, particularly in irregular sub-pixel arrangements due to the sub-pixel arrangement itself.
Logically, a pixel is made up of RGB components in a certain proportion, and the positions of the RGB components are the same, i.e. the logical positions (also referred to herein as theoretical positions) of the RGB sub-pixels are the same, referred to as pixel logical positions. In an actual panel, RGB components corresponding to the same pixel are three physical sub-pixels with adjacent positions, and the positions of the RGB components do not coincide with each other, as shown in fig. 1. The position of each sub-pixel in the actual panel is referred to as a physical pixel position, and is also referred to as a physical position. The method aims to solve the problem that errors caused by dislocation among different color sub-physical pixel positions affect demura; particularly, the invention provides a method for compensating for mura at a sub-pixel level of a display panel, wherein the influence of errors caused by dislocation among sub-physical pixel positions of different colors in irregular sub-pixel arrangement on demura is provided. In the present invention, the display panel may be an OLED display panel or an AMOLED panel, which is not limited in the present invention. As shown in fig. 2, the method specifically includes the following steps:
s10, obtaining the arrangement mode of the sub-pixels of the display panel, grouping the sub-pixels of the display panel, wherein the sub-pixels in each group have the same color and the same offset position, and manufacturing a display template; specifically, the step of grouping the sub-pixels of the display panel includes: and grouping the display module sub-pixels for the first time according to the colors, and grouping for the second time according to the offset direction. The step of manufacturing the display template comprises the following steps: determining a gray scale to be shot; and each group of display template sub-pixels are used for manufacturing a corresponding display template aiming at the gray scale to be shot.
S12, lighting the display panel according to the display template, and photographing the picture presented by the display panel to obtain a sub-pixel image;
s14, performing moving processing on each sub-pixel image to obtain offset images, wherein the position of the image of each sub-pixel in each offset image is the same as the logic position;
s16, performing demura processing on the display panel.
The invention groups the sub-pixels of the display panel according to the colors and the offset positions, and shifts the sub-pixel images relative to the pixel logic positions, thereby solving the problem of display uniformity caused by dislocation of the physical positions and the logic positions of the pixels of different channels.
In one specific example, the display panel includes R, G, B subpixels per pixel, where at least one subpixel has more than two (including two) offset positions relative to a logical position. And for the physical pixels with the same color, grouping the physical pixels according to the offset positions of the physical pixels so as to solve the problem of dislocation of the physical positions and the logical positions of the pixels in the irregular pixel arrangement.
In one particular example, subpixels having more than two offset positions have a first subpixel offset position and a second subpixel offset position with respect to a logical position, the subpixel images including a first subpixel image and a second subpixel image.
Since the color screen captures only the target partial pixels as compared with other color screens, there is a large pitch between the pixels to be captured, and it is necessary to perform pixel-matching processing on the image in which only the target partial pixels are captured. Accordingly, the method further comprises:
moving the first sub-pixel image having the first sub-pixel shift position in the direction of the second sub-pixel shift position in its entirety by a distance to obtain a first moving image, adding the first moving image to the first sub-pixel image to obtain a first filled image,
moving the first compensation image to obtain a first offset image, wherein the position of the sub-pixel image in the first offset image is the same as the logic position;
moving the second sub-pixel image having the second sub-pixel shift position by the distance in the direction of the first sub-pixel shift position as a whole to obtain a second moving image, adding the second moving image to the second sub-pixel image to obtain a second complementary image,
and performing moving processing on the second compensation image to obtain a second offset image, wherein the position of the image of the sub-pixel in the second offset image is the same as the logic position.
And moving for a distance to obtain the adjacent physical pixel spacing of the sub-pixel image with the same adjacent spacing at the sub-pixel physical position in the shot image.
In a specific example, the first offset image and the second offset image are processed by demura algorithm to obtain a first processed image and a second processed image respectively.
In a specific example, the first processed image and the second processed image are subjected to pixel value alignment, partial areas in the centers of the first processed image and the second processed image are respectively selected, a pixel mean value of the first processed image and a pixel mean value of the second processed image are calculated, and the first aligned image and the second aligned image are further calculated by using the pixel mean value of the first processed image and the pixel mean value of the second processed image.
In one specific example, for the first and second alignment images, the areas where the pixels in the first and second display templates are lit are taken, respectively, resulting in sub-pixel level mura compensation data for the channels of the same color as the first and second alignment images.
By adopting the method, the invention also solves the problem of data fusion obtained by shooting the same color picture for multiple times on the basis of solving the problem of dislocation of the physical position and the logical position of the pixel in the irregular pixel arrangement.
The invention groups different types of SPR arrangements, including irregular SPR arrangements, of physical pixels into different groups based on their offset relationship to the theoretical position. Corresponding spatial offset compensation is performed on (same set of) data with the same offset. And enabling the pixel position in the data to strictly correspond to the theoretical position of the pixel position so as to eliminate the influence of errors caused by dislocation between the physical pixel positions of different colors on demura.
In order to make the technical solution of the present invention clearer, the method provided by the present invention will be further explained with reference to the accompanying drawings and specific examples.
Step 1, analyzing the arrangement mode of the sub-pixels of the display panel. The physical pixels of the display panel are grouped according to their color and offset relationships. In the present example, as shown in fig. 1, the colors of the physical pixels of the display panel include three colors of red, green, and blue. With reference to the G pixels, all G pixels and all R pixels are offset fixed, i.e. since the distance between G pixels is constant, the distance between R, G pixels is also constant. There are two kinds of positional shifts of the B pixels. The B pixels are divided into B1, B2 according to an offset relationship. Wherein G represents green, R represents red, and B represents blue. In the present example, the physical pixels of the display panel are divided into 4 groups.
In this example, the position of a display panel logical pixel is P (m, n), and its sub-pixel physical positions are: green G (m, n), red R (m, n), blue B1 (m, n), and blue B2 (m, n). Wherein, for the physical positions G (m, n) and R (m, n) of the green and red sub-pixels, m and n are both greater than or equal to 1. An offset position B1 (m, n) exists for the blue subpixel, where m is greater than or equal to 1, n is greater than or equal to 1, and when m is odd, n is odd; when m is an even number, n is an even number, such as B1 (1, 1), B1 (1, 3), B1 (2, 2), etc., which are not described herein in detail. Another offset position B2 (m, n) exists for the blue sub-pixel, where m ≧ 1, n ≧ 1, and when m is odd, n is even; when m is even, n is odd, such as B2 (1, 2), B2 (1, 4), B2 (2, 1), etc., which are not repeated herein.
And 2, according to the grouping in the previous step, making four template pictures for each gray scale to be shot, and enabling each template picture to light up pixels in one grouping. Specifically, the four template pictures are, respectively, pure green Gx as shown in fig. 3(a), pure red Rx as shown in fig. 3(B), odd-even interlaced blue B1x as shown in fig. 3(c), and B2x as shown in fig. 3(d) which is complementary to B1 x. Wherein x is the corresponding gray scale.
And 3, sequentially lighting the four groups of template pictures, and shooting the display effect of the display panel by using a camera to obtain four images GxC, RxC, B1xC and B2 xC.
In this example, only half of the target pixels are captured for the blue B1xC and B2xC image data relative to the green and red, captured pixels with a large pitch between the pixels. Therefore, it is necessary to perform pixel compensation processing on an image in which only half of the pixels of the object are captured.
Specifically, B1xC is obtained by shifting B1xC entirely by dist in the direction of the sub-pixel shift position B2, that is, by the entire shift dist to the right side in fig. 11. Where dist = GxC adjacent physical pixel pitch. Let B1xC2 = B1xC+B1xC1Thereby obtaining pixel-filled B1xC2And (4) an image.
Similarly, the process B2xC moves B2xC by dist in the direction of the sub-pixel shift position of B1 as a whole, that is, moves by dist in the left direction as shown in fig. 1, resulting in B2xC1Where dist = GxC adjacent physical pixel pitch. Let B2xC2 = B2xC+B2xC1(ii) a Thereby obtaining pixel-filled B2xC2And (4) an image.
Step 4, because the distance between the green pixels is constant, GxC, RxC, B1xC are taken as reference of a G (namely green) picture2And B2xC2The whole is shifted by a corresponding distance so that the images of the pixels of different channels at the same logical position are located the same. Wherein GxC has an x-direction and y-direction offset of 0, resulting in GxCA, RxCA, B1xC2A and B2xC2A. The invention groups the sub-pixels of the display panel according to the colors, and solves the problem of dislocation of physical positions and logical positions of pixels of different channels (RGB).
Step 5, performing conventional demura algorithm processing on the result of the previous step to obtain result matrixes with the same resolution as the display panel, namely GxCB, RxCB and B1xC2B and B2xC2B。
Preferably, since B1xC2B and B2xC2B, from taking the interlaced template pictures B1x, B2x, but the data from taking in two shots; pixel value alignment is required to allow the two graphs to be fused. Specifically, B1xC can be taken2B center 10% area region, calculating pixel mean value B1xC2Bm; similarly take B2xC2The area of 10 percent of the center of B is calculated to obtain a mean value B2xC2Bm, and (b) is added. Pixel value alignment and the result are as follows
Further preferably, the compound of formula (I) is B1xC2B1And B2xC2B1And respectively taking effective (namely, lightened pixels) areas in the template images B1x and B2x to form a new matrix BxCB, namely obtaining the blue channel subpixel level mura compensation data BxCB.
Thus, GxCB, RxCB and BxCB are respectively a green channel, a red channel and a blue channel, and the full-resolution data after the pixels are aligned can be subjected to demura flow in a conventional mode.
The invention groups the physical pixels with the same color according to the positions, solves the problem of dislocation of the physical positions and the logic positions of the pixels in the irregular pixel arrangement, and also solves the problem of data fusion obtained by shooting the pictures with the same color for multiple times. The invention realizes demura compensation at the sub-pixel level (physical pixel level), and eliminates errors introduced by the difference between the physical position and the logical position of the sub-pixel, particularly the errors in irregular sub-pixel arrangement.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (6)
1. A method for compensating a display panel at a sub-pixel level, comprising:
obtaining a display panel sub-pixel arrangement mode, grouping display panel sub-pixels, wherein the sub-pixels in each group have the same color and the same offset position, and manufacturing a display template, wherein each pixel of the display panel comprises R, G, B sub-pixels, at least one sub-pixel has more than two offset positions relative to a logic position, the sub-pixels with more than two offset positions have a first sub-pixel offset position and a second sub-pixel offset position relative to the logic position, and the sub-pixel image comprises a first sub-pixel image and a second sub-pixel image;
lightening the display panel according to the display template, and photographing the picture presented by the display panel to obtain a sub-pixel image;
shifting each sub-pixel image to obtain offset images, wherein the position of each sub-pixel image in each offset image is the same as the logic position,
if only the target partial pixels in the picture are photographed, the sub-pixel images are moved to obtain offset images, and the position of the image of each sub-pixel in each offset image is the same as the logic position, including:
integrally moving the first sub-pixel image with the first sub-pixel offset position to the second sub-pixel offset position for a certain distance to obtain a first moving image, and adding the first moving image to the first sub-pixel image to obtain a first complementary image;
moving the first compensation image to obtain a first offset image, wherein the position of the sub-pixel image in the first offset image is the same as the logic position;
integrally moving the second sub-pixel image with the second sub-pixel offset position to the first sub-pixel offset position for the distance to obtain a second moving image, and adding the second moving image to the second sub-pixel image to obtain a second complementary image;
performing moving processing on the second compensation image to obtain a second offset image, wherein the position of the sub-pixel image in the second offset image is the same as the logic position;
the distance is the adjacent physical pixel distance of the sub-pixel image of which the sub-pixel physical positions have the same adjacent distance in the shot image;
and (5) performing demura processing on the display panel.
2. The method of claim 1, wherein the step of creating a display template comprises: determining a gray scale to be shot; and each group of display template sub-pixels are used for manufacturing a corresponding display template aiming at the gray scale to be shot.
3. The method of claim 1, wherein grouping the display panel sub-pixels comprises: and grouping the display module sub-pixels for the first time according to the colors, and grouping for the second time according to the offset direction.
4. The method of claim 1,
and performing demura algorithm processing on the first offset image and the second offset image to respectively obtain a first processed image and a second processed image.
5. The method of claim 4,
and performing pixel value alignment on the first processing image and the second processing image, respectively selecting partial areas in the centers of the first processing image and the second processing image, calculating a pixel mean value of the first processing image and a pixel mean value of the second processing image, and further calculating by using the pixel mean value of the first processing image and the pixel mean value of the second processing image to obtain a first alignment image and a second alignment image.
6. The method of claim 5,
and for the first alignment image and the second alignment image, respectively taking the lighted areas of the pixels in the first display template and the second display template, thereby obtaining the sub-pixel level mura compensation data of the channel with the same color as the first alignment image and the second alignment image.
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