CN110853105B - Method and device for simultaneously positioning RGB (red, green and blue) sub-pixels and application - Google Patents
Method and device for simultaneously positioning RGB (red, green and blue) sub-pixels and application Download PDFInfo
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Abstract
The invention discloses a method, a device and application for simultaneously positioning RGB (red, green and blue) sub-pixels, wherein the positioning method comprises the following steps: obtaining a checkerboard picture displayed by a display screen, wherein the checkerboard picture comprises R, G, B checkerboard and black cells, and the black cells simultaneously light part R, G, B sub-pixels; carrying out coarse positioning on R, G, B sub-pixels according to the R, G, B checkerboard respectively to obtain an initial positioning value of R, G, B sub-pixels; respectively correcting the initial positioning values of the corresponding color sub-pixels by using R, G, B sub-pixels displayed in the black cells to obtain accurate positioning values of R, G, B sub-pixels; the method can realize the simultaneous positioning of the RGB sub-pixel points by only one positioning process, simplifies the positioning process, reduces the positioning time to 1/3 of the time of the conventional positioning process, and effectively shortens the beat time of the DeMura process.
Description
Technical Field
The invention belongs to the technical field of image processing, and particularly relates to a method, a device and application for simultaneously positioning RGB (red, green and blue) sub-pixels.
Background
With the increasing social demand, display technologies are rapidly developing. The LCD screen used for the small-area display screen such as mobile phone and tablet computer is basically replaced by the OLED screen at present, and then the LCD screen is developed towards the flexible screen with higher heat in the near term. The finished display panel needs to ensure that no defects or defects are within an allowable range to be introduced into the market, and the occurrence of Mura defects is inevitable due to the complexity and difficulty of the display panel production process, so that the Mura defect repair must be performed using the DeMura technique. Due to the characteristics of self-luminescence, independent driving of each pixel point and the like, the Mura defect of the OLED screen is expressed in a sub-pixel level, and a very accurate Mura defect compensation method is needed. The existing DeMura technical process of the OLED screen generally comprises four processes of image preprocessing, sub-pixel brightness extraction, sub-pixel gamma measurement and sub-pixel voltage compensation. The compensation of the Mura defect is realized by compensating the driving voltage of the sub-pixel points, and the compensation value of the driving voltage is determined by the gamma value calculated based on the brightness value, so that the accurate extraction of the brightness of each sub-pixel point is crucial in the Mura defect repair process of the OLED screen, and the accurate extraction of the brightness is based on the accurate positioning of each sub-pixel point of RGB. In the Mura defect repairing process, a certain Takt Time (TT) is needed to be spent for positioning the RGB sub-pixel points.
The conventional positioning process is shown in fig. 1, firstly making R, G, B checkerboard pictures respectively, then guiding the pictures into a screen body to be displayed respectively, and then positioning R, G, B sub-pixels respectively based on image capture data after image capture by a camera. That is, the position distribution of R, G, B sub-pixels can be obtained only by three positioning processes, which means that the whole positioning process needs to perform three screen shots, three camera shots and three positioning algorithms, and the TT used for pixel positioning in the DeMura process is undoubtedly increased. Generally, the time required by the DeMura process is about 80s, and the long TT is a great challenge in the use process of the DeMura technology, while the positioning process of RGB sub-pixel points in the current DeMura technology is slightly repeated and occupies a long time. Therefore, it is necessary to develop a new positioning method to reduce the positioning TT, so as to shorten the duration of the DeMura procedure, so as to meet the requirements of the OLED DeMura technology.
Disclosure of Invention
Aiming at least one defect or improvement requirement in the prior art, the invention provides a method, a device and an application for simultaneously positioning RGB (red, green and blue) sub-pixels, which comprises the steps of firstly acquiring a checkerboard picture which is acquired by a camera and displayed by a display screen, wherein the checkerboard picture comprises R, G, B checkerboard and black cells, and part R, G, B sub-pixels are simultaneously lightened in the black cells; then, carrying out coarse positioning on R, G, B sub-pixels according to R, G, B checkerboards respectively to obtain an initial positioning value of R, G, B sub-pixels; correcting the initial positioning value of the corresponding color sub-pixel by using R, G, B sub-pixels displayed in the black cell to obtain an accurate positioning value of R, G, B sub-pixels; therefore, the RGB sub-pixel points can be simultaneously positioned only through one positioning process, the positioning process is simplified, and the time for positioning is reduced to 1/3 of the time for the conventional positioning process.
To achieve the above object, according to a first aspect of the present invention, a display screen lighting method is provided, in which a display screen is lit up by using a prefabricated checkerboard image, so that R, G, B checkerboard and black cells are included in a checkerboard image displayed by the display screen, and a portion R, G, B of subpixels are simultaneously lit up in the black cells.
Preferably, in the above dot screen method for a display screen, the R, G, B checkerboards are alternately arranged in units of rows or columns.
According to a second aspect of the present invention, there is also provided a method of simultaneous positioning of RGB sub-pixels, the method comprising:
acquiring checkerboard pictures displayed on a display screen and collected by a camera, wherein the checkerboard pictures comprise R, G, B checkerboard and black cells, and part of R, G, B sub-pixels are lightened simultaneously in the black cells;
carrying out coarse positioning on R, G, B sub-pixels according to the R, G, B checkerboard respectively to obtain an initial positioning value of R, G, B sub-pixels;
and respectively correcting the initial positioning values of the corresponding color sub-pixels by using R, G, B sub-pixels displayed in the black cells to obtain R, G, B accurate positioning values of the sub-pixels.
Preferably, the method for positioning RGB sub-pixels simultaneously, wherein the correcting the initial positioning value of each sub-pixel by using R, G, B sub-pixels displayed in a black cell specifically includes:
and respectively calculating R, G, B sub-pixel imaging point spread functions in the black cells, searching a maximum value in a neighborhood formed by the point spread functions, and performing two-dimensional data interpolation by using the maximum value to calculate the accurate positioning value of the corresponding color sub-pixel.
Preferably, the method for simultaneously positioning RGB sub-pixels, wherein the coarsely positioning R, G, B sub-pixels according to the R, G, B checkerboard respectively specifically includes:
and roughly positioning R, G, B sub-pixels by respectively utilizing corner point coordinates of R, G, B checkerboard to carry out two-dimensional data interpolation.
According to a third aspect of the present invention, there is also provided an apparatus for RGB sub-pixel simultaneous localization, comprising:
the device comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring checkerboard pictures displayed by the display screen and collected by a camera, the checkerboard pictures comprise R, G, B checkerboard cells and black cells, and the black cells simultaneously light part R, G, B sub-pixels;
the first positioning module is used for performing coarse positioning on R, G, B sub-pixels according to the R, G, B checkerboard to obtain an initial positioning value of the R, G, B sub-pixels;
and the second positioning module is used for correcting the initial positioning values of the corresponding color sub-pixels by respectively utilizing R, G, B sub-pixels displayed in the black cells to obtain accurate positioning values of R, G, B sub-pixels.
Preferably, in the apparatus for positioning RGB sub-pixels simultaneously, the second positioning module calculates point spread functions of R, G, B sub-pixels in the black cells, searches for a maximum value in a neighborhood formed by the point spread functions, and calculates a precise positioning value of the corresponding color sub-pixel by interpolating two-dimensional data using the maximum value.
Preferably, in the apparatus for simultaneously positioning RGB sub-pixels, the first positioning module performs coarse positioning on the R, G, B sub-pixels by performing two-dimensional data interpolation on corner coordinates of R, G, B checkerboard.
According to a fourth aspect of the present invention, there is provided a Mura defect repairing method, including any one of the above RGB sub-pixels simultaneous positioning method, further including:
and respectively extracting the brightness values of the corresponding color sub-pixels from the display image of the display screen according to the accurate positioning value of R, G, B sub-pixels, and respectively calculating R, G, B Mura compensation values of the sub-pixels based on the brightness values.
According to a fifth aspect of the present invention, there is also provided a computer readable medium storing a computer program executable by an electronic device, the computer program, when run on the electronic device, causing the electronic device to perform the steps of any of the above methods for RGB sub-pixel simultaneous localization, or the steps of a Mura defect repair method.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the method, the device and the application for simultaneously positioning the RGB sub-pixels can realize the simultaneous positioning of the RGB sub-pixels only through one positioning process (including screen cutting, camera drawing, image processing and the like), so that the time length for positioning is reduced to 1/3 of the time length of a conventional positioning process; the method can be used for simultaneously positioning the RGB sub-pixel points in the OLED DeMura technology, simplifies the positioning process, effectively shortens the beat time of the DeMura process, fills the blank in the technical field, and assists the development of the display screen industry.
(2) Firstly, coarsely positioning the R, G, B sub-pixels according to an R, G, B checkerboard, and then correcting the initial positioning values of the corresponding color sub-pixels by utilizing R, G, B sub-pixels displayed in black cells to obtain accurate positioning values of the R, G, B sub-pixels; the positioning accuracy is significantly improved by two-stage positioning.
Drawings
FIG. 1 is a schematic diagram of a conventional positioning process of RGB sub-pixel points in the DeMura technology;
FIG. 2 is a flow chart of a method for RGB sub-pixel simultaneous localization according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a checkerboard picture taken by a camera according to an embodiment of the present invention; wherein, fig. 3 (a) is an overall distribution diagram of the checkerboard picture, and fig. 3 (b) is an enlarged view of a single black cell;
fig. 4 is a schematic diagram of positioning errors of R, G, B sub-pixel points in the X and Y directions after checkerboard positioning according to an embodiment of the present invention; wherein, fig. 4 (a) is a positioning error map of the R sub-pixel; FIG. 4 (b) is a positioning error map of the G sub-pixel; FIG. 4 (c) is a positioning error map of the B sub-pixel;
FIG. 5 is a logic block diagram of an apparatus for RGB sub-pixel simultaneous localization according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
Fig. 2 is a flowchart of a method for simultaneously positioning RGB sub-pixels according to the present embodiment, and referring to fig. 2, the method includes the following steps:
s110: acquiring checkerboard pictures displayed on a display screen and collected by a camera, wherein the checkerboard pictures comprise R, G, B checkerboard and black cells, and part of R, G, B sub-pixels are lightened simultaneously in the black cells;
firstly, lighting an OLED display screen to display a prefabricated checkerboard image; r, G, B checkerboard and black cells are included in the checkerboard image, and portions R, G, B of the subpixels are simultaneously lit in the black cells. In this embodiment, the number of R, G, B checkerboards and their respective position distribution in the whole checkerboard image are not particularly limited, and in order to simplify the process of making the checkerboard image, as a preferable scheme, the R, G, B checkerboards in this embodiment are alternately arranged in units of rows or columns. In addition, the size of the checkerboard is not particularly limited.
Then, a camera is used for collecting checkerboard pictures displayed by the OLED display screen; fig. 3 is a view showing a checkerboard picture captured by a camera, wherein fig. 3 (a) is a distribution diagram of the checkerboard picture, as can be seen from fig. 3 (a), the first three rows of white cells of the checkerboard picture respectively include B checkerboard, G checkerboard and R checkerboard, and in terms of overall distribution, the B checkerboard, G checkerboard and R checkerboard are in a distribution state of being alternately arranged in the Y-axis direction; it should be noted that the areas of the B checkerboard, the G checkerboard, and the R checkerboard shown in fig. 3 (a) are smaller than the areas of the white/black cells, and the partial areas of the single white cells are the B/G/R checkerboard; in addition, the areas of the B checkerboard, the G checkerboard and the R checkerboard can be increased to be equal to the area of the black unit cell, so that the white unit cell is not displayed in the checkerboard picture. Since the position distribution of R, G, B checkerboard in the prepared checkerboard image is known, a black-and-white camera or a color camera can be used to capture the display image of the OLED display screen, and the embodiment is not particularly limited.
Fig. 3 (b) is an enlarged view of a single black cell, and it can be seen from fig. 3 (b) that a limited number R, G, B sub-pixels of the OLED module are simultaneously displayed in the black cell, and in this embodiment, the following method is adopted to simultaneously light up a limited number R, G, B sub-pixels: firstly, selecting a plurality of rows of pixel units to be lighted in the OLED display screen in the Y-axis direction according to a set row interval, selecting a plurality of pixel units to be lighted in one row of pixel units according to the set pixel interval for the pixel units in the same row, and selectively lighting R, G, B any one of sub-pixels in a single pixel unit, wherein the embodiment preferably lights R, G, B sub-pixels in one row of pixel units alternately; the line interval and the pixel interval may be set according to the requirement, and the embodiment is not particularly limited. In addition, the above-mentioned limited R, G, B sub-pixels that simultaneously display the OLED module in the black cell is a preferred example given in this embodiment, and is not a limitation to this embodiment, and in the actual operation process, only R, G, B sub-pixels need to be simultaneously displayed in the black cell, and the number of R, G, B sub-pixels is not specifically limited.
S120: carrying out coarse positioning on R, G, B sub-pixels according to the R, G, B checkerboard respectively to obtain an initial positioning value of R, G, B sub-pixels;
acquiring checkerboard pictures displayed by an OLED display screen and collected by a camera, and carrying out coarse positioning on R sub-pixels according to R checkerboard displayed in white unit cells to obtain initial positioning values of the R sub-pixel pairs; the scheme of the specific rough positioning method is not specifically limited, in the embodiment, the two-dimensional data interpolation value is performed by adopting the corner point coordinates of the R checkerboard to perform rough positioning on the R sub-pixel, and as the acquired R checkerboard is a discrete pixel unit, the acquired checkerboard picture image is subjected to binarization preprocessing and then the corner point coordinates of the R checkerboard are detected by adopting a Harris algorithm; and carrying out two-dimensional data interpolation by using the coordinates of the corner points of the checkerboard to realize the coarse positioning of all R sub-pixels.
Similarly, G, B subpixels are coarsely positioned separately in the same manner, resulting in G, B initial positioning values for the subpixels.
S130: respectively correcting the initial positioning values of the corresponding color sub-pixels by using R, G, B sub-pixels displayed in the black cells to obtain accurate positioning values of R, G, B sub-pixels;
in the embodiment, after R, G, B sub-pixels are coarsely positioned, R, G, B sub-pixels are accurately positioned through a limited R, G, B sub-pixel points of an OLED display screen displayed in a black cell, so that the positioning accuracy is improved; as a preferred example, the present embodiment first calculates the point spread function of R, G, B sub-pixels in the black cell, and takes the R sub-pixel as an example to explain: after a point spread function of the R sub-pixel is obtained, searching a maximum value in a neighborhood formed by the point spread function, and then carrying out interpolation on two-dimensional data by using the maximum value to calculate an accurate positioning value of the R sub-pixel; and calculating G, B the accurate positioning value of the sub-pixel in the same way, and improving the positioning accuracy of each sub-pixel.
After the positioning is finished, the positioning accuracy of the method is judged through the positioning result of R, G, B sub-pixel points, and the judgment method can adopt, but is not limited to, judgment through consistency errors of vertical coordinates and horizontal coordinates of sub-pixel points of each row and each column respectively. Positioning errors of R, G, B sub-pixels in the X direction and the Y direction after R, G, B sub-pixels are positioned through the checkerboard shown in fig. 3 are respectively shown in fig. 4 (a), (b), and (c), wherein a consistency error in the X direction is calculated through a consistency error of a vertical coordinate of each row of sub-pixels, a consistency error in the Y direction is calculated through a consistency error of a horizontal coordinate of each column of sub-pixels, a chromaticity bar reflects a distribution range of the consistency error, a unit is one camera pixel, and a dispersion degree of the distribution of the consistency errors can be represented by a Root Mean Square Error (RMSE). The smaller the RMSE of the absolute value of the chromaticity bar value and the consistency error, the higher the positioning accuracy. As can be seen from fig. 4, the maximum root mean square error of R, G, B sub-pixels after positioning is 0.06, wherein the minimum root mean square error of G sub-pixels is only 0.02, which indicates that the positioning error of RGB sub-pixels positioning using the method is very small and has better positioning accuracy.
Example two
The embodiment provides a device for simultaneously positioning RGB sub-pixels, which is used for implementing the method for simultaneously positioning RGB sub-pixels in the first embodiment; the device can be realized in a software and/or hardware mode and can be integrated on the electronic equipment; as shown in fig. 5, the apparatus includes an obtaining module, a first positioning module, and a second positioning module; wherein:
the acquisition module is used for acquiring checkerboard pictures displayed by an OLED display screen and acquired by a camera, wherein the checkerboard pictures comprise R, G, B checkerboard and black cells, and part R, G, B sub-pixels are simultaneously lightened in the black cells; the checkerboard picture taken by the camera is shown in fig. 3.
The first positioning module performs coarse positioning on R, G, B sub-pixels according to the R, G, B checkerboard to obtain an initial positioning value of R, G, B sub-pixels;
optionally, the first positioning module detects the coordinates of the corner points of the RG and B checkerboards respectively by using a Harris algorithm, and then performs two-dimensional data interpolation on the coordinates of the corner points of the R, G, B checkerboards to perform coarse positioning on the R, G, B sub-pixels.
The second positioning module corrects the initial positioning value of the corresponding color sub-pixel by using R, G, B sub-pixels displayed in the black cells, respectively, to obtain an accurate positioning value of R, G, B sub-pixels.
Optionally, the second positioning module calculates point spread functions of R, G, B sub-pixels in the black cells, respectively, and after obtaining the point spread functions, searches for a maximum value in a neighborhood formed by the point spread functions, and performs two-dimensional data interpolation using the maximum value to calculate an accurate positioning value of the sub-pixel corresponding to the color.
EXAMPLE III
The embodiment provides a Mura defect repairing method, which comprises the steps of the RGB sub-pixel simultaneous positioning method, wherein after positioning of each color sub-pixel is completed, the brightness values of the corresponding color sub-pixels are respectively extracted according to the accurate positioning values of the RGB sub-pixels, and the Mura compensation values of the RGB sub-pixels are respectively calculated based on the brightness values.
Specifically, the repairing method comprises the following steps:
s210: acquiring checkerboard pictures displayed on a display screen and collected by a camera, wherein the checkerboard pictures comprise R, G, B checkerboard and black cells, and part of R, G, B sub-pixels are lightened simultaneously in the black cells;
s220: carrying out coarse positioning on R, G, B sub-pixels according to the R, G, B checkerboard respectively to obtain an initial positioning value of R, G, B sub-pixels;
s230: respectively correcting the initial positioning values of the corresponding color sub-pixels by using R, G, B sub-pixels displayed in the black cells to obtain accurate positioning values of R, G, B sub-pixels;
the detailed processes of steps S210-S230 can be seen in the first embodiment, and are not described herein again.
S240: respectively extracting the brightness values of the corresponding color sub-pixels from the display image of the display screen according to the accurate positioning value of R, G, B sub-pixels, and respectively calculating R, G, B Mura compensation values of the sub-pixels based on the brightness values;
in this embodiment, the display image of the display screen may be a common R, G, B monochrome picture, a gray scale picture or other pictures, which is not limited in this embodiment; extracting the brightness values of the corresponding color sub-pixels from the display image according to the accurate positioning value of R, G, B sub-pixels, and further calculating R, G, B Mura compensation values of the sub-pixels according to the brightness values, wherein the calculation of the Mura compensation values can adopt a conventional DeMura algorithm, and the embodiment is not limited; after the Mura compensation value of R, G, B sub-pixels is obtained, the Mura compensation value is input to a drive IC of a display panel to repair the Mura defect.
Example four
The present embodiment also provides a computer readable medium storing a computer program executable by an electronic device, and when the computer program runs on the electronic device, the electronic device executes the steps of the method for RGB sub-pixel simultaneous localization in the first embodiment, or the steps of the Mura defect repairing method in the third embodiment. Types of computer readable media include, but are not limited to, storage media such as SD cards, usb disks, fixed hard disks, removable hard disks, and the like.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for simultaneous positioning of RGB sub-pixels, comprising:
obtaining a checkerboard picture displayed by a display screen, wherein the checkerboard picture comprises R, G, B checkerboard and black cells, and the black cells simultaneously light part R, G, B sub-pixels;
carrying out coarse positioning on R, G, B sub-pixels according to the R, G, B checkerboard respectively to obtain an initial positioning value of R, G, B sub-pixels;
and respectively correcting the initial positioning values of the corresponding color sub-pixels by using R, G, B sub-pixels displayed in the black cells to obtain R, G, B accurate positioning values of the sub-pixels.
2. The method as claimed in claim 1, wherein the correcting the initial positioning value of each sub-pixel by using R, G, B sub-pixels displayed in black cells comprises:
and respectively calculating R, G, B point diffusion functions of sub-pixel imaging in the black cells, and correcting the initial positioning values of the sub-pixels of each color based on the point diffusion functions.
3. The method as claimed in claim 1, wherein the coarse positioning R, G, B sub-pixels according to the R, G, B checkerboard respectively comprises:
and roughly positioning R, G, B sub-pixels by respectively utilizing corner point coordinates of R, G, B checkerboard to carry out two-dimensional data interpolation.
4. The method as claimed in claim 1, wherein said R, G, B chequered grids are alternately arranged in units of rows or columns.
5. An apparatus for simultaneous positioning of RGB sub-pixels, comprising:
the device comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring checkerboard pictures displayed by the display screen, the checkerboard pictures comprise R, G, B checkerboard and black cells, and partial R, G, B sub-pixels are simultaneously lightened in the black cells;
the first positioning module is used for performing coarse positioning on R, G, B sub-pixels according to the R, G, B checkerboard to obtain an initial positioning value of the R, G, B sub-pixels;
and the second positioning module is used for correcting the initial positioning values of the corresponding color sub-pixels by respectively utilizing R, G, B sub-pixels displayed in the black cells to obtain accurate positioning values of R, G, B sub-pixels.
6. The apparatus for RGB sub-pixel simultaneous localization as claimed in claim 5, wherein the second localization module calculates point spread functions of R, G, B sub-pixels in black cells respectively, and corrects the initial localization value of each sub-pixel based on the point spread functions.
7. The apparatus for RGB sub-pixel simultaneous localization as claimed in claim 5 or 6, wherein the first localization module coarsely localizes R, G, B sub-pixels by performing two-dimensional data interpolation using corner coordinates of R, G, B checkerboard, respectively.
8. The RGB sub-pixel simultaneous localization apparatus of claim 5, wherein said R, G, B checkerboard alternates between rows and columns.
9. A Mura defect repairing method, comprising the method for simultaneously positioning the RGB sub-pixels according to any claim 1-4, further comprising:
and respectively extracting the brightness values of the corresponding color sub-pixels from the display image of the display screen according to the accurate positioning value of R, G, B sub-pixels, and respectively calculating R, G, B Mura compensation values of the sub-pixels based on the brightness values.
10. A computer-readable medium, in which a computer program is stored which is executable by an electronic device, and which, when run on the electronic device, causes the electronic device to perform the steps of the method of any one of claims 1 to 4 or 9.
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| CN113012096B (en) * | 2020-12-28 | 2022-06-17 | 深圳精智达技术股份有限公司 | Display screen sub-pixel positioning and brightness extraction method, device and storage medium |
| CN114495803A (en) * | 2022-03-31 | 2022-05-13 | 武汉精立电子技术有限公司 | Mura repairing method of display panel |
| CN114943764B (en) * | 2022-05-19 | 2023-05-26 | 苏州华兴源创科技股份有限公司 | Curved surface screen pixel positioning method, device and equipment |
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| KR101895530B1 (en) * | 2012-02-10 | 2018-09-06 | 삼성디스플레이 주식회사 | Display device and driving method of the same |
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