Display panel correction method, device, display device manufacturing method and storage medium

Abstract

The present application discloses a display panel correction method, device, display device preparation method and storage medium, wherein the correction method comprises: obtaining first brightness information and second brightness information of the display panel under n preset grayscales; wherein the first brightness information comprises brightness information of some test points at the edge and center of the display panel, and the second brightness information comprises brightness information of test points at the edge and center of the display panel, and n is an integer greater than or equal to 1; based on the first brightness information and the second brightness information, the brightness of the display panel is corrected. The display panel correction method in the present application has a good correction effect, so that the overall brightness of the display panel after correction is close to uniform.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel correction method, device, display device preparation method and storage medium. Background Art

[0002] Due to fluctuations in the manufacturing process of display panels, the produced display panels often have display problems, such as various mura (i.e., uneven display brightness). When the display panels are spliced ​​into a display device, the display device will have obvious gaps at the splicing points and uneven overall display brightness, affecting the display effect.

[0003] Currently, display panel manufacturers are actively working to improve the mura phenomenon, but the existing mura compensation effect is poor. Summary of the invention

[0004] The present application provides a display panel correction method, device, display device manufacturing method and computer-readable storage medium, which improve the display effect of the display panel by compensating the brightness of the display panel to improve the mura improvement effect.

[0005] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide a correction method for a display panel, the correction method comprising:

[0006] Obtaining first brightness information and second brightness information of the display panel at n preset grayscales; wherein the first brightness information includes brightness information of some test points at the edge and center of the display panel, and the second brightness information includes brightness information of the test points at the edge and center of the display panel, and n is an integer greater than or equal to 1;

[0007] The brightness of the display panel is corrected based on the first brightness information and the second brightness information.

[0008] The first brightness information includes absolute brightness information of some test points located at the edge and center of the display panel, and the second brightness information includes relative brightness information of all test points of the display panel.

[0009] The step of correcting the brightness of the display panel based on the first brightness information and the second brightness information of the display panel includes:

[0010] Obtaining a first grayscale compensation value based on first brightness information of each preset grayscale and first target brightness information;

[0011] Obtaining a second grayscale compensation value based on the second brightness information of each preset grayscale and the second target brightness information;

[0012] The sum of the first compensation value and the second compensation value of the same preset gray scale is used as the final gray scale compensation value of the display panel at the current preset gray scale.

[0013] The step of obtaining the first grayscale compensation value based on the first brightness information of each preset grayscale and the first target brightness information includes:

[0014] Obtaining a corresponding first sub-grayscale compensation value based on first brightness information of each partial test point under each preset grayscale and a first target brightness;

[0015] A first grayscale compensation value of the display panel is obtained based on the first sub-grayscale compensation value.

[0016] Preferably, the step of obtaining the corresponding first sub-grayscale compensation value based on the first brightness information of each partial test point under each preset grayscale and the first target brightness includes:

[0017] For the same part of the test points, a first fitting curve is obtained based on n preset grayscales and first brightness information of the preset grayscales;

[0018] Obtaining a corresponding first fitting grayscale from a first fitting curve based on first target brightness information of a current preset grayscale;

[0019] A first sub-grayscale compensation value is obtained based on the first fitting grayscale and the current preset grayscale.

[0020] The step of obtaining the second compensation value based on the second brightness information of each preset grayscale and the second target brightness information includes:

[0021] Obtaining average brightness information of the second brightness information of all test points of the display panel at the current preset grayscale, and using the average brightness information as the second target brightness information;

[0022] Obtaining a first reference compensation value through the second target brightness information and the second brightness information;

[0023] Performing brightness compensation on a local area of ​​the display panel based on the first reference compensation value to obtain a second reference compensation value; wherein the local area of ​​the display panel includes part of the test points of the display panel;

[0024] Performing brightness compensation on all regions of the display panel based on the second reference compensation value to obtain a third reference compensation value;

[0025] The second compensation value is obtained by subtracting the third reference compensation value from the first reference compensation value.

[0026] The step of correcting the brightness of the display panel based on the first brightness information and the second brightness information of the display panel includes:

[0027] Obtaining the ratio of the first brightness information to the second brightness information of each partial test point under the current preset gray scale;

[0028] Correcting the second brightness information using the ratio to obtain second brightness correction information;

[0029] A compensation value is determined according to the second brightness correction information and the first target brightness information.

[0030] The compensation value is used as the final grayscale compensation value of the display panel at the current preset grayscale.

[0031] To solve the above technical problems, another technical solution adopted in the present application is: to provide a correction device for a display panel, which includes a brightness detection unit and a processor; wherein the brightness detection unit is used to obtain first brightness information and second brightness information of the display panel under n preset grayscales; the processor is used to correct the brightness of the display panel based on the first brightness information and the second brightness information of the display panel, where n is an integer greater than or equal to 1.

[0032] Preferably, the brightness detection unit includes a brightness meter for obtaining first brightness information of a single partial test point and a picture acquisition device for photographing to obtain second brightness information of the display panel;

[0033] Preferably, the picture acquisition device comprises a camera.

[0034] The display panel calibration device further comprises a first driving mechanism, the first driving mechanism is used to drive the brightness meter to move so as to obtain first brightness information of some test points one by one; or, the number of brightness meters is the same as the number of some test points, and a plurality of brightness meters simultaneously obtain the first brightness information of the above-mentioned some test points, and the number of some test points is multiple;

[0035] Alternatively, the brightness meter and the image acquisition device are fixedly connected to simultaneously obtain the first brightness information and the second brightness information of some test points.

[0036] To solve the above technical problems, another technical solution adopted in the present application is: to provide a method for preparing a display device, splicing multiple calibrated display panels to form a display device, wherein the display panel is calibrated using the display panel calibration method in any of the above embodiments.

[0037] To solve the above technical problems, another technical solution adopted in the present application is: providing a computer-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, a display panel correction method described in any one of the above embodiments is implemented.

[0038] The beneficial effects of the present application are as follows: the display panel correction method in the present application, by obtaining the brightness information of the display panel under n preset grayscales, n is an integer greater than or equal to 1, realizes the brightness correction of the display panel, and the correction effect is good, so that the overall brightness of the corrected display panel is consistent and the brightness uniformity is good. Specifically, the first brightness information and the second brightness information of the display panel are obtained under n preset grayscales, and the brightness correction is performed for the n preset grayscales, which is conducive to improving the accuracy of the brightness correction and improving the correction effect. And the first brightness information and the second brightness information respectively include at least the brightness information of some test points at the edge and the center of the display panel, and the brightness information is collected for the edge and the center of the display panel. In the subsequent brightness correction, the consistency of the brightness of the edge and the center can be effectively improved, and the overall brightness uniformity of the display panel can be improved. The brightness of the display panel is corrected based on the first brightness information and the second brightness information, and the advantages of the two are used to perform brightness correction on the display panel, so as to improve the pertinence of the brightness correction, thereby improving the accuracy of the brightness correction of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0040] Figure 1 This is a schematic diagram of a flow chart of an implementation method of a display panel calibration method of the present application;

[0041] Figure 2 A schematic diagram showing the positions of some test points in a display panel according to an embodiment of the present application;

[0042] Figure 3 A schematic diagram showing the positions of some test points in another embodiment of the display panel of the present application;

[0043] Figure 4 for Figure 1 A schematic flow chart of an implementation method of step S2 in FIG.

[0044] Figure 5 for Figure 4 A schematic flow chart of an implementation method of step S21 in FIG.

[0045] Figure 6 for Figure 5 A schematic flow chart of an implementation method of step S211;

[0046] Figure 7 for Figure 6A schematic diagram of an implementation of the first fitting curve in step S2111;

[0047] Figure 8 for Figure 4 A schematic flow chart of an implementation method of step S22;

[0048] Fig. 9 for Figure 1 A schematic flow chart of another implementation of step S2;

[0049] Fig.10 It is a structural schematic diagram of an embodiment of a display panel correction device in the present application. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] See also Figure 1 , Figure 1 1 is a flow chart of an embodiment of a display panel calibration method of the present application; wherein the calibration method comprises the following steps:

[0052] S1: Obtain first brightness information and second brightness information of the display panel at n preset grayscales, where n is an integer greater than or equal to 1; wherein the first brightness information includes brightness information of some test points at the edge and center of the display panel, and the second brightness information includes brightness information of test points at the edge and center of the display panel.

[0053] By detecting the brightness information of the display panel, the first brightness information and the second brightness information of the display panel under each preset grayscale can be obtained. By correcting the display panel through the first brightness information and the second brightness information, the correction effect and the accuracy of the correction can be improved. Among them, the n preset grayscales can be binding point grayscales, and n is an integer greater than or equal to 1, so one or more preset grayscales can be selected when selecting the preset grayscale. Specifically, the binding point grayscale can select one or more of 16 / 128 / 255 grayscales. Sub-pixels of various colors can be lit up in sequence for the display panel, and the display panel can be tested under different binding point grayscales. For example, the display panel may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. In some embodiments, the red sub-pixel in the display panel can be lit up first, and then the first brightness information and the second brightness information can be obtained under 16 / 128 / 255 grayscales respectively. Of course, the color of the sub-pixel lit up and the order of the selected binding point grayscale are not limited. In some embodiments, the first brightness information can be obtained using a first brightness detection unit, and the second brightness information can be obtained using a second brightness detection unit. The first brightness detection unit and the second brightness detection unit may be the same or different. For example, the first brightness detection unit may be a brightness meter, and the second brightness detection unit may be a camera.

[0054] See also Figure 2 and Figure 3 , Figure 2 This is a schematic diagram showing the positions of some test points in a display panel according to an embodiment of the present application. Figure 3 The present invention is a schematic diagram of the positions of some test points in another embodiment of the display panel of the present application. The first brightness information includes the brightness information of some test points at the edge and center of the display panel, wherein some test points are part of all test points in the display panel. The second brightness information includes the brightness information of the test points at the edge and center of the display panel. It can be understood that the edge is closer to the circumferential contour of the display panel than the center. The specific sizes of the edge and center may not be limited and can be selected according to actual needs. In some embodiments, the test point may be an object corresponding to the brightness information. In some embodiments, the display panel may include a plurality of sub-pixels. The test point may correspond to a sub-pixel. There may be multiple test points. For example, the first brightness information may include the first brightness information of at least one sub-pixel located at the edge of the display panel and the first brightness information of at least one sub-pixel located at the center. Accordingly, the second brightness information may include the second brightness information of at least one sub-pixel located at the edge of the display panel and the second brightness information of at least one sub-pixel located at the center.

[0055] Multiple test points corresponding to the first brightness information can be selected according to the test needs. In some embodiments, four test points at the edge parts can be selected. It can be understood that, usually, the shape of the display panel is approximately a rectangle, and the four test points can be located at the four corners of the display panel. It can be understood that the number of partial test points selected at the edge parts is greater than or equal to 1. Preferably, the number of partial test points at the edge parts is greater than or equal to 4. In some embodiments, the partial test points selected at the center part can be 1, or can be multiple. In some embodiments, partial test points can select test points at the corners and the center of the display panel. For example, when the display panel is rectangular, such as Figure 2 As shown, some of the test points may include four corner test points and one center test point. Of course, in other embodiments, some of the test points may be designed in other ways, for example, Figure 3 As shown, some of the test points include four corner test points, one central test point located in the center, and four edge test points; wherein, one edge test point may be provided between two adjacent corner test points. It is understood that some of the test points at the edge of the display panel may include corner test points and edge test points.

[0056] In some embodiments, some test points at the edge and center corresponding to the first brightness information may be the same as the test points at the edge and center corresponding to the second brightness information; or, may be different; or, may be partially the same.

[0057] In some embodiments, the test points corresponding to the second brightness information may include the test points corresponding to the first brightness information. The number of test points corresponding to the second brightness information may be greater than the number of test points corresponding to the first brightness information. The at least partial difference between the test points corresponding to the first brightness information and the second brightness information is conducive to further improving the correction effect and improving the display uniformity.

[0058] In some embodiments, the test points corresponding to the second brightness information may include all the test points of the display panel, and the test points corresponding to the first brightness information may include some of the test points of the display panel.

[0059] Testing and correcting the test points at the edge of the display panel is beneficial for correcting the brightness of the edge of the display panel, so as to achieve the same overall brightness of the display panel in the future. Testing and correcting the test points at the center of the display panel is beneficial for correcting the brightness of the center of the display panel, so as to achieve the overall brightness of the edge and center of the display panel to be close to the same. The brightness information of the test points at the edge and center of the display panel is obtained respectively. After correction, the brightness of the display panel can be roughly the same, and the brightness of the display panel is visually consistent, eliminating the situation where the brightness of each area in the display panel is inconsistent and has large differences.

[0060] In some embodiments, the first brightness information includes absolute brightness information of some test points located at the edge and center of the display panel, and the second brightness information includes relative brightness information of the entire display panel. The first brightness information is the absolute brightness information obtained by the brightness detection unit at the test points at each edge and center, so the number of the first brightness information is the same as the number of selected test points in the edge and center. The second brightness information is obtained for all test points of the display panel, so the number of the second brightness information is the same as the total number of test points, so the number of the second brightness information is more than the number of the first brightness information. And the first brightness information is absolute brightness information, wherein the absolute brightness is the real brightness information of some test points in the display panel, that is, the actual brightness information; the relative brightness is the reference brightness information of the entire test point of the display panel. By obtaining the first brightness information and the second brightness information, and using the advantages of the two to perform brightness correction on the display panel, the pertinence of the brightness correction can be improved, the shortcomings of a single correction method can be made up, and the accuracy of the brightness correction of the display panel can be improved.

[0061] S2: Correcting the brightness of the display panel based on the first brightness information and the second brightness information of the display panel.

[0062] See also Figure 4 , Figure 4 for Figure 1 Schematic diagram of a flow chart of an implementation method of step S2 in FIG. Brightness correction is performed on the display panel according to the first brightness information and the second brightness information of the display panel. Specifically, step S2 includes:

[0063] S21: Obtaining a first grayscale compensation value based on first brightness information of each preset grayscale and first target brightness information.

[0064] See also Figure 5 , Figure 5 for Figure 4Schematic diagram of a flow chart of an implementation method of step S21 in FIG. Since there is a corresponding relationship between grayscale and brightness in the display panel, for the first brightness information and the first target brightness information under the preset grayscale, the first fitting grayscale corresponding to the first brightness information under the preset grayscale can be obtained through the first target brightness information, and the first grayscale compensation value can be obtained through the difference between the preset grayscale and the first fitting grayscale. Specifically, step S21 includes:

[0065] S211: Obtaining a corresponding first sub-grayscale compensation value based on the first brightness information of each part of the test points under each preset grayscale and the first target brightness.

[0066] See also Figure 6 and Figure 7 , Figure 6 for Figure 5 A schematic flow chart of an implementation method of step S211; Figure 7 for Figure 6 Schematic diagram of an implementation of the first fitting curve in step S2111; specifically, step S211 includes:

[0067] S2111: For the same part of the test points, obtain a first fitting curve based on n preset grayscales and first brightness information of the preset grayscales, where n is an integer greater than or equal to 1.

[0068] For the same part of the test points, one preset grayscale or multiple preset grayscales can be selected. The first brightness information corresponding to the test point under the current preset grayscale can be obtained through the brightness detection unit. In one embodiment, the grayscale is used as the horizontal coordinate and the brightness information is used as the vertical coordinate to draw a first fitting curve L1 corresponding to the preset grayscale and the corresponding first brightness information. In one embodiment, Figure 7 As shown, the brightness detection unit is used to test the same part of the test points at 16 grayscales, 128 grayscales and 255 grayscales respectively, and the first brightness information shown as the hollow points in the figure is obtained, and the first fitting curve L1 is drawn. In another embodiment, a preset grayscale can be selected, such as one of 16 grayscales, 128 grayscales and 255 grayscales. Some test points are tested at a preset grayscale to obtain the first brightness information, and the first fitting curve L1 is drawn for the preset grayscale and the first brightness information. Further, when n is 1, the first fitting curve L1 can be drawn based on the first brightness information of the preset grayscale and 0 grayscale.

[0069] S2112: Obtaining a corresponding first fitting grayscale from a first fitting curve based on first target brightness information of a current preset grayscale.

[0070] In one embodiment, the brightness information corresponding to the 255 grayscale G255 is used as the first target brightness information L255', that is, the black solid point in the figure. Since there is a linear relationship between grayscale and brightness, the second fitting curve L2 is drawn through the corresponding relationship between the first target brightness information and the grayscale. Through the second fitting curve L2, it can be obtained that under ideal conditions, the target brightness information corresponding to the 128 grayscale G128 is L128', and the target brightness information corresponding to the 16 grayscale G16 is L16'. Therefore, through the first target brightness information L255' corresponding to the 255 grayscale, the target brightness information corresponding to other preset grayscales can be obtained, that is, the gray solid point in the figure. The first fitting grayscale corresponding to the target brightness information is obtained in the first fitting curve L1. That is, on the first fitting curve L1, the target brightness information corresponding to the 255 grayscale G255 is found to be L255', the target brightness information corresponding to the 128 grayscale G128 is found to be L128', and the target brightness information corresponding to the 16 grayscale G16 is found to be L16'. The first fitting grayscales corresponding to L255', L128' and L16' in the target brightness information on the first fitting curve L1 are found to be G255', G128' and G16' respectively.

[0071] S2113: Obtaining a first sub-grayscale compensation value based on the first fitting grayscale and the current preset grayscale.

[0072] In one embodiment, the first sub-grayscale compensation value may be determined by the difference between the first fitting grayscale and the current preset grayscale. For example, the first sub-grayscale compensation value corresponding to the current preset grayscale may be obtained by the difference between the first fitting grayscale G255' and the current preset grayscale G255.

[0073] S212: Obtaining a first grayscale compensation value of the display panel based on the first sub-grayscale compensation value.

[0074] The first grayscale compensation value of the display panel is obtained based on the first sub-grayscale compensation value of the test points at the edge and the center, that is, the first sub-grayscale compensation value of all the test points is calculated to obtain the first grayscale compensation value of all the sub-pixels in the display panel. In one embodiment, when the first sub-grayscale value of all the test points is calculated, the resize function can be used to process the first sub-grayscale value, and then the first grayscale compensation value of the display panel can be obtained. The first grayscale compensation value is a compensation background value. The resize function can be used to process the image, including the nearest neighbor interpolation method, the unilinear interpolation method and the bilinear interpolation method, wherein the nearest neighbor interpolation method is a simple interpolation algorithm that does not require calculation. Among the four neighboring pixels of the pixel to be confirmed, the grayscale value of the neighboring pixel closest to the pixel to be confirmed is assigned to the pixel to be confirmed; the unilinear interpolation method is to calculate the information of one point using the information of two points in the known image; the bilinear interpolation method is to calculate the information of one point using 4 (2*2) points in the known image, so the compensation effect of the bilinear interpolation method is better than that of the nearest neighbor interpolation method. In one embodiment, the nearest neighbor interpolation method can be used to obtain the first grayscale compensation value, and the first grayscale compensation values ​​of the remaining sub-pixels can be obtained by using the first sub-grayscale value of the known test point; by determining the first sub-grayscale value of the test point closest to the sub-pixel, the first sub-grayscale value of the test point is assigned to the sub-pixel. In other embodiments, the single linear interpolation method or the bilinear interpolation method can be used to obtain the first grayscale compensation values ​​of all test points.

[0075] S22: Obtaining a second grayscale compensation value based on the second brightness information of each preset grayscale and the second target brightness information.

[0076] See also Figure 8 , Figure 8 for Figure 4 In some embodiments, the second brightness detection unit can be used to simultaneously obtain the second brightness information of all test points of the display panel at the same preset grayscale. Step S22 includes:

[0077] S221: Obtain average brightness information of second brightness information of all test points of the display panel at a current preset gray scale, and use the average brightness information as second target brightness information.

[0078] In some embodiments, the average brightness information of the second brightness information of all test points of the display panel at the current preset gray scale can be obtained by using a brightness detection unit. The brightness detection unit can obtain the second brightness information of all sub-pixels in the display panel, obtain the average brightness information of the second brightness information of all sub-pixels, and use the average brightness information as the second target brightness information.

[0079] S222: Obtain a first reference compensation value through the second target brightness information and the second brightness information.

[0080] Since there is a corresponding relationship between brightness information and grayscale, the second target brightness information and the grayscale values ​​corresponding to the second brightness information are obtained respectively, and the first reference compensation value is determined by the difference between the grayscale value corresponding to the second brightness information and the grayscale value corresponding to the second target brightness information.

[0081] S223: Performing brightness compensation on a local area of ​​the display panel based on the first reference compensation value to obtain a second reference compensation value.

[0082] A partial area of ​​the display panel is defined as a local area, and the local area includes some test points. The local area of ​​the display panel can be arbitrarily determined on the display panel, and the area includes at least two or more sub-pixels. In one embodiment, a local area of ​​16*16 size in any orientation can be selected on the display panel, and the first reference compensation value is used to perform brightness compensation on the sub-pixels in the selected partition through a resize algorithm to obtain a second reference compensation value.

[0083] S224: Performing brightness compensation on all regions of the display panel based on the second reference compensation value to obtain a third reference compensation value.

[0084] The second reference compensation value is applied to the entire pixel of the display panel through the resize algorithm, and the third reference compensation value corresponding to each sub-pixel in the display panel can be obtained through the resize algorithm operation.

[0085] S225: taking the difference between the first reference compensation value and the third reference compensation value as the second compensation value.

[0086] The second compensation value is determined by the difference between the first reference compensation value and the third reference compensation value. The grayscale value is composed of a background value and a characteristic value, wherein the third reference compensation value is the background value, and the first reference compensation value is a compensation value for all sub-pixels in the display panel, and the compensation details, i.e., the compensation characteristic value, are obtained by subtracting the compensation background value from the compensation value, so the third compensation value is the compensation characteristic value.

[0087] S23: taking the sum of the first compensation value and the second compensation value of the same preset gray scale as the final gray scale compensation value of the display panel at the current preset gray scale.

[0088] After lighting up a sub-pixel of a color, a first compensation value and a second compensation value are obtained at n preset grayscales, respectively, where n is an integer greater than or equal to 1. At the same preset grayscale, the sum of the first compensation value and the second compensation value is used as the final grayscale compensation value of the display panel at the current preset grayscale. The first compensation value is a background compensation value, and the second compensation value is a characteristic compensation value. The combination of the first compensation value and the second compensation value is the combination of the background compensation value and the characteristic compensation value, which can obtain a better compensation effect. When the second compensation value is used to perform brightness compensation on the display panel, the brightness uniformity of the display panel can be improved, and the first compensation value is used to perform brightness compensation on the display panel to eliminate the color cast problem of the display panel. Using the sum of the first compensation value and the second compensation value of the same preset grayscale as the final grayscale compensation value of the display panel at the current preset grayscale can effectively improve the brightness compensation effect of the display panel, so that the overall brightness uniformity of the display panel is better, and there is no color cast problem.

[0089] See also Fig. 9 , Fig. 9 for Figure 1 Schematic diagram of another implementation of step S2 in the flowchart; In another embodiment, S2: the step of correcting the brightness of the display panel based on the first brightness information and the second brightness information of the display panel, further comprising:

[0090] S24: Obtaining the ratio of the first brightness information to the second brightness information of each partial test point at the current preset gray scale.

[0091] A first brightness detection unit can be used to obtain the first brightness information of the display panel under n preset grayscales, and a second brightness detection unit can be used to obtain the second brightness information of the display panel under n preset grayscales, where n is an integer greater than or equal to 1. And the ratio of the first brightness information to the second brightness information of each partial test point under the current preset grayscale is obtained. When a preset grayscale is selected and the first brightness information and the second brightness information of the display panel under the preset grayscale are obtained, the acquisition time of the brightness information can be effectively shortened and the acquisition efficiency of the brightness information can be improved. When multiple preset grayscales are selected, the brightness correction effect of the display panel can be effectively improved.

[0092] In one embodiment, at least five test points are selected in the display panel, including at least the brightness information of the corner test points and the central test points of the display panel, and these five test points are partial test points. By testing the corner test points of the display panel, the brightness of the places where the display panels are connected is consistent after brightness correction, and the visual effect is better; at the same time, the brightness test is performed on the central test point of the display panel, so that the brightness of all sub-pixels of the display panel is uniform. When 5 test points are selected, at the same preset grayscale, the first brightness detection unit is used to obtain the first brightness information L1, L2, L3, L4, and L5 of the display panel, and the second brightness detection unit is used to obtain the second brightness information L1', L2', L3', L4', and L5' of the display panel; the ratio Ratio (Ratio1, Ratio2, Ratio3, Ratio4, Ratio5) of the first brightness information to the second brightness information of the 5 selected test points at the current preset grayscale is calculated, wherein Ratio1 = L1 / L1', Ratio2 = L2 / L2', Ratio3 = L3 / L3', Ratio4 = L4 / L4', and Ratio5 = L5 / L5'.

[0093] S25: Correct the second brightness information using the ratio to obtain second brightness correction information.

[0094] The second brightness information is corrected by using a ratio, that is, the ratio is multiplied by the second brightness information, and the second brightness correction information is obtained after correction. Specifically, the second brightness detection unit obtains the second brightness information L1', L2', L3', L4', L5' of each test point of the display panel, and corrects the second brightness information by using a ratio Ratio, that is, the ratio is multiplied by the second brightness information, the second brightness correction information L"=L'*Ratio=L'*(L / L')=L, that is, the second brightness correction information is equal to the first brightness information; for example, taking the first test point as an example, L1"=L1'*Ratio=L1'*(L1 / L1')=L1, that is, the second brightness correction information for the first test point is equal to the first brightness information of the first test point. In one embodiment, the accuracy of the first brightness information is greater than the accuracy of the second brightness information. In one embodiment, the brightness measured by the first brightness detection unit is more accurate than the brightness measured by the second brightness detection unit at the same preset grayscale. The first brightness information is absolute brightness information, and the second brightness information is relative brightness information. The second brightness information is corrected using a ratio to replace the original brightness information measured by the second brightness detection unit, which is beneficial to improving the accuracy of the correction result.

[0095] S26: Determine a compensation value according to the second brightness correction information and the first target brightness information.

[0096] The compensation value of the display panel is determined by the first target brightness information and the second brightness correction information, and the compensation value can be obtained by the same technical means as in step S21. Since there is a corresponding relationship between grayscale and brightness in the display panel, for the second brightness correction information at a preset grayscale and the first target brightness information, the second fitting grayscale corresponding to the second brightness correction information at the preset grayscale can be obtained by the first target brightness information, and the compensation value can be obtained by the difference between the preset grayscale and the second fitting grayscale.

[0097] S27: using the compensation value as a final grayscale compensation value of the display panel at the current preset grayscale.

[0098] The compensation value obtained in the above steps is used as the final grayscale compensation value of the display panel at the current preset grayscale, and the final grayscale compensation value is used to compensate the display panel at different preset grayscales.

[0099] The display panel calibration method provided in the present application can be used to calibrate display panels such as Micro LED display panels and OLED display panels.

[0100] The present application also provides a display panel that is calibrated using any of the above-mentioned display panel calibration methods.

[0101] In some embodiments, a display panel calibrated by the display panel calibration method provided in the present application can be used to splice multiple display panels to form a display device. After calibration, multiple display panels can be prepared to form a display device. The display device includes multiple calibrated display panels.

[0102] In one embodiment, the display panel calibration method further includes: S3: splicing the calibrated display panels together.

[0103] In addition, the present application also provides a method for preparing a display device, comprising: splicing a plurality of calibrated display panels to form a display device; wherein the display panels are calibrated using the display panel calibration method in any of the above embodiments.

[0104] The above correction method can be used to correct the brightness of a single display panel. The brightness uniformity of the corrected display panel is effectively improved. At the same time, the brightness values ​​of the middle and edge parts of a single display panel are roughly the same, which improves the brightness consistency of the single display panel. In addition, the first target brightness set for each display panel is the same, so that the brightness of each display panel after correction is close to the same. The corrected multiple display panels can be spliced ​​to form a display device, so that the brightness values ​​of each display panel in the display device are roughly the same, and the overall brightness uniformity of the display device is good, and there will be no situation where the brightness of the spliced ​​edge is significantly different from that of the display device as a whole.

[0105] The present application also provides a display device, comprising a plurality of display panels calibrated using the display panel calibration method provided in any of the above embodiments.

[0106] In one embodiment, the red sub-pixel of the display panel may be first lit, and the brightness detection unit may be used to detect the brightness of 9 test points of the display panel in sequence under n preset grayscales to obtain the first brightness information, where n is an integer greater than or equal to 1. The first compensation value is determined based on the first brightness information of each preset grayscale and the first target brightness information, wherein the first target brightness information of each display panel is the same, and the first sub-grayscale compensation value corresponding to the first brightness information is obtained with reference to the first target brightness information, and the first sub-grayscale compensation value is applied to all sub-pixels of the display panel through the resize algorithm to obtain the first compensation value. The brightness detection unit may be used to detect the brightness of 9 test points of the display panel in sequence under n preset grayscales to obtain the first brightness information. Then, the brightness detection unit may be used to obtain the second brightness information of the display panel under n preset grayscales; wherein the brightness detection unit may obtain the second brightness information of all sub-pixels in the display panel through one detection. The average value of the second brightness information of all sub-pixels is obtained as the second target brightness information. The first reference compensation value is obtained through the second target brightness information and the second brightness information of all sub-pixels, and a local area in the display panel is selected. A local area of ​​16*16 size can be selected, and the first reference compensation value is applied to the partition using the resize function, and the sub-pixels of the partition are brightness compensated. Then, the first reference compensation value in the partition is applied to the overall pixels of the display panel. The second reference compensation value corresponding to each sub-pixel in the display panel can be obtained through the resize algorithm. The second compensation value is obtained by subtracting the second reference compensation value from the first reference compensation value. Finally, the sum of the first compensation value and the second compensation value of the same preset grayscale is used as the final grayscale compensation value of the display panel under the current preset grayscale.

[0107] In another embodiment, the first brightness detection unit and the second brightness detection unit are used to detect five test points of the display panel at n preset grayscales at the same time, obtain the first brightness information and the second brightness information, and obtain the ratio of the first brightness information and the second brightness information, where n is an integer greater than or equal to 1. In one embodiment, the preset grayscale can be selected as 255 grayscale, and the first brightness detection unit and the second brightness detection unit are used to detect five test points of the display panel at 255 grayscales at the same time, obtain the first brightness information and the second brightness information, and obtain the ratio of the first brightness information and the second brightness information, and then use the ratio to correct the second brightness information, and correct the second brightness information by the first brightness information, thereby eliminating the problem of inaccurate brightness information measured by the second brightness detection unit, and obtain the second brightness correction information by multiplying the ratio and the second brightness information. Then, the compensation value is determined by the second brightness correction information and the first target brightness information. The compensation value is applied to perform brightness correction on the display panel to improve the correction efficiency of the display panel.

[0108] By adopting the display panel correction method in the present application, the display panel can be calibrated directly on the production line, and there is no need to calibrate the spliced ​​display device, so as to eliminate the brightness and chromaticity difference between the display panels in the display device. The display panel can be calibrated on the production line, and after the calibration is completed, the display panel can be directly shipped to the customer, and then the calibrated display panel can be spliced ​​at the customer's site to form a display device. The compensation efficiency of the display panel is improved, and at the same time, the cumbersome process of brightness compensation at the installation site of the end customer is avoided. Especially for Micro LED display panels, the display panel can be corrected to improve the compensation efficiency, and the display uniformity of the spliced ​​display device can be improved.

[0109] See also Fig.10 , Fig.10 It is a structural schematic diagram of an embodiment of a display panel correction device in the present application. The present application also includes a correction device 10 for a display panel, and the correction device 10 includes a brightness detection unit 11 and a processor 12. Among them, the brightness detection unit includes a first brightness detection unit and a second brightness detection unit. The first brightness detection unit is used to obtain the first brightness information of the display panel under n preset grayscales, where n is an integer greater than or equal to 1, and the second brightness detection unit is used to obtain the second brightness information of the display panel under n preset grayscales. The processor 12 is used to correct the brightness of the display panel based on the first brightness information and the second brightness information of the display panel. Through the coordinated operation of the brightness detection unit 11 and the processor 12, the first brightness information and the second brightness information of the display panel are obtained, and then the processor calculates the compensation value to achieve brightness compensation of the display panel.

[0110] In one embodiment, the first brightness detection unit includes a brightness meter for obtaining first brightness information of a single test point; the brightness meter may be a display color analyzer (CA410) commonly used in the industry. Since the test range of the brightness meter is limited, a brightness meter that matches the number of some test points may be selected for the brightness test of a single display panel, or one brightness meter may be used to test multiple points of the display panel.

[0111] The second brightness detection unit includes a picture acquisition device, which is used to obtain the second brightness information of the display panel by photographing; the second brightness detection unit can obtain the second brightness information by taking a picture of the display panel. Preferably, the picture acquisition device includes a camera. The second brightness information is obtained by the camera, and the camera can take pictures of all the test points of the display panel, and then the second brightness information for the entire display panel can be obtained by taking a picture once.

[0112] Furthermore, the correction device 10 of the display panel also includes a first driving mechanism, which is used to drive the brightness meter to move to obtain the first brightness information of some test points one by one; or, the number of brightness meters is the same as the number of some test points, and multiple brightness meters simultaneously obtain the first brightness information of multiple partial test points; when the correction device 10 also includes the first driving mechanism, since the first brightness detection unit needs to test multiple partial test points, the first driving mechanism drives the first brightness detection unit to move, and moves to the positions corresponding to the partial test points respectively, so that the first brightness detection unit tests the partial test points. When the correction device 10 includes the first driving mechanism, only one brightness meter is needed to complete the test of multiple partial test points in the display panel. Alternatively, when testing the display panel, a brightness meter with the same number as the partial test points can be selected to test the display panel. By testing multiple partial test points on the display panel at the same time by multiple brightness meters, the time for collecting the first brightness information can be shortened.

[0113] Alternatively, the brightness meter and the picture acquisition device are fixedly connected to obtain the first brightness information and the second brightness information of some test points at the same time. When the brightness meter and the picture acquisition device are fixedly connected, the brightness meter and the picture acquisition device can detect the display panel at the same time to obtain the first brightness information and the second brightness information. Compared with the method in which the brightness meter and the picture acquisition device are not fixedly connected and the display panel is detected separately, the method in which the brightness meter and the picture acquisition device are fixedly connected and the first brightness information and the second brightness information are obtained at the same time improves the efficiency of brightness information acquisition and the correction efficiency of the display panel, and meets the production line beat.

[0114] The present application also includes a computer-readable storage medium, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the correction method of the display panel included in the above-mentioned embodiment is implemented.

[0115] The present application also provides a display panel, comprising the above-mentioned computer-readable storage medium.

[0116] In the present application, a display panel correction method, a correction device, and a computer-readable storage medium are applied, a brightness meter and an image acquisition device are used to collect brightness information of a display panel, and the brightness information is processed to realize brightness correction of the display panel. The brightness data of the test point measured by the brightness meter is more accurate, and grayscale compensation is performed on a single display panel using the brightness information measured by the brightness meter and the same target brightness information set in each display panel, so that each display panel can achieve the same brightness after correction, ensuring the correction effect of the display panel. At the same time, no secondary correction is required after the display panels are spliced, thereby improving the correction efficiency of the display device.

[0117] The above is only an embodiment of the present application, and does not limit the scope of the patent of the present application. It should be understood that the preferred embodiments described above are only used to illustrate and explain the present invention, and are not used to limit the present invention. In addition, the embodiments and features in the embodiments of the present application can be combined with each other if there is no conflict. Any equivalent structure or equivalent process transformation made by using the description and drawings of this application, or directly or indirectly used in other related technical fields, are also included in the scope of patent protection of this application.

Claims

1. A method for calibrating a display panel, characterized in that: The correction method comprises: Acquire first brightness information and second brightness information of the display panel at n preset grayscales; wherein the first brightness information includes brightness information of some test points at the edge and center of the display panel, and the second brightness information includes brightness information of test points at the edge and center of the display panel, and n is an integer greater than or equal to 1; Correcting the brightness of the display panel based on the first brightness information and the second brightness information; Wherein, the step of correcting the brightness of the display panel based on the first brightness information and the second brightness information includes: Obtaining a first grayscale compensation value based on the first brightness information and the first target brightness information of each of the preset grayscales; Obtaining a second grayscale compensation value based on the second brightness information and the second target brightness information of each of the preset grayscales; taking the sum of the first grayscale compensation value and the second grayscale compensation value of the same preset grayscale as the final grayscale compensation value of the display panel at the current preset grayscale; Wherein, the step of obtaining a first grayscale compensation value based on the first brightness information and the first target brightness information of each preset grayscale includes: Obtaining a corresponding first sub-grayscale compensation value based on the first brightness information of each of the partial test points under each of the preset grayscales and the first target brightness; The first grayscale compensation value of the display panel is obtained based on the first sub-grayscale compensation value.

2. The calibration method according to claim 1, characterized in that: The first brightness information includes absolute brightness information of some test points located at the edge and center of the display panel, and the second brightness information includes relative brightness information of all test points of the display panel.

3. The calibration method according to claim 1, characterized in that: The step of obtaining a corresponding first sub-grayscale compensation value based on the first brightness information of each of the partial test points under each of the preset grayscales and the first target brightness comprises: For the same part of the test points, a first fitting curve is obtained based on the n preset grayscales and the first brightness information of the preset grayscales; and a corresponding first fitting grayscale is obtained from the first fitting curve based on the first target brightness information of the current preset grayscale; The first sub-grayscale compensation value is obtained based on the first fitting grayscale and the current preset grayscale.

4. The calibration method according to claim 1, characterized in that: The step of obtaining a second compensation value based on the second brightness information and the second target brightness information of each of the preset grayscales comprises: Obtaining average brightness information of the second brightness information of all test points of the display panel at a current preset grayscale, and using the average brightness information as second target brightness information; Obtaining a first reference compensation value through the second target brightness information and the second brightness information; Performing brightness compensation on a local area of ​​the display panel based on the first reference compensation value to obtain a second reference compensation value; wherein the local area of ​​the display panel includes part of the test points of the display panel; Performing brightness compensation on all regions of the display panel based on the second reference compensation value to obtain a third reference compensation value; The second compensation value is obtained by subtracting the third reference compensation value from the first reference compensation value.

5. The calibration method according to claim 1, characterized in that: The step of correcting the brightness of the display panel based on the first brightness information and the second brightness information includes: Obtaining a ratio of the first brightness information to the second brightness information of each of the partial test points at the current preset grayscale; Correcting the second brightness information using the ratio to obtain second brightness correction information; determining a compensation value according to the second brightness correction information and the first target brightness information; The compensation value is used as a final grayscale compensation value of the display panel at the current preset grayscale.

6. A display panel calibration device, using the calibration method according to any one of claims 1 to 5, characterized in that: The device comprises: a brightness detection unit, configured to obtain first brightness information and second brightness information of the display panel at n preset grayscales; wherein the first brightness information includes brightness information of some test points at the edge and center of the display panel, and the second brightness information includes brightness information of the test points at the edge and center of the display panel, and n is an integer greater than or equal to 1; A processor is used to correct the brightness of the display panel based on the first brightness information and the second brightness information.

7. The calibration device according to claim 6, characterized in that: The brightness detection unit includes a brightness meter for obtaining first brightness information of the part of the test points and a picture acquisition device for photographing to obtain second brightness information of the display panel.

8. The calibration device according to claim 7, characterized in that: The picture acquisition device includes a camera.

9. The calibration device according to claim 8, characterized in that: Also includes: A first driving mechanism, used for driving the brightness meter to move so as to obtain first brightness information of the part of the test points one by one; Alternatively, the number of the brightness meters is the same as the number of the partial test points, and the plurality of brightness meters simultaneously obtain the first brightness information of the plurality of partial test points; Alternatively, the brightness meter and the picture acquisition device are fixedly connected to simultaneously acquire the first brightness information and the second brightness information.

10. A method for preparing a display device, characterized in that: A plurality of calibrated display panels are spliced ​​together to form a display device, wherein the display panels are calibrated using the display panel calibration method according to any one of claims 1 to 5.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the display panel correction method according to any one of claims 1 to 5 is implemented.

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