Brightness correction method and brightness correction device for display panel

Abstract

Embodiments of the present application provide a display panel brightness correction method and a display panel brightness correction device, and relate to the technical field of display, and aim to solve the problem that the image of the display panel collected by the display panel during demura has a bright band area, and the bright band area presents a dark band after demura. The display panel brightness correction method comprises the following steps: collecting a first image of a display panel; identifying a bright band area in the first image; obtaining at least one mapping area according to the bright band area; updating data in the bright band area in the first image to data in at least one mapping area in the first image, and generating a second image; and performing brightness correction on the display panel according to the second image.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel brightness correction method and a display panel brightness correction device. BACKGROUND

[0002] In the related art, in order to alleviate the mura (display uneven phenomenon) of the display panel in the use process, it is usually necessary to perform demura on the display panel, that is, through the operation of the demura to eliminate the display uneven phenomenon.

[0003] In the process of demura, due to the structural design of the display panel, the image of the display panel collected usually has a bright band area, and the display abnormality shown by the bright band area is not the same as the mura of the display panel itself. If the conventional demura method is used for correction, a dark band will be presented at the position corresponding to the bright band area, thereby deteriorating the normal display effect of the display panel. SUMMARY

[0004] Embodiments of the present application provide a display panel brightness correction method and a display panel brightness correction device to solve the problem that the image of the display panel collected in the demura of the display panel in the related art has a bright band area, and the bright band area presents a dark band after demura.

[0005] In one aspect, embodiments of the present application provide a display panel brightness correction method, which includes: collecting a first image of a display panel; identifying a bright band area in the first image; obtaining at least one mapping area according to the bright band area; updating data in the first image located in the bright band area to data in the first image located in at least one mapping area, and generating a second image; and performing brightness correction on the display panel according to the second image.

[0006] In some embodiments, after the identification of the bright band area in the first image, the brightness correction method further includes: obtaining a to-be-corrected area according to the bright band area, wherein the obtaining at least one mapping area according to the bright band area includes: obtaining at least one mapping area according to the to-be-corrected area; and the updating data in the first image located in the bright band area to data in the first image located in at least one mapping area includes: updating data in the first image located in the to-be-corrected area to data in the first image located in at least one mapping area.

[0007] In some embodiments, the shape of the to-be-corrected area is a rectangle, and the boundary of the to-be-corrected area surrounds the bright band area.

[0008] In some embodiments, along a length direction of the first image, the bright band region comprises at least one near boundary point closest to a boundary line of the first image and at least one far boundary point farthest to the boundary line; and along the length direction of the first image, a size of the region to be corrected is greater than or equal to a distance between the near boundary point and the far boundary point.

[0009] In some embodiments, the identifying the bright band region in the first image comprises: calculating a gray scale difference value of two adjacent points on the first image; comparing the gray scale difference value with a preset threshold value; and in a case that the gray scale difference value is greater than the preset threshold value, selecting one of the two adjacent points as a boundary point of the bright band region.

[0010] In some embodiments, in a case that the at least one mapping region comprises one mapping region, the updating the data in the region to be corrected in the first image to data in at least one mapping region in the first image comprises: updating the data in the one mapping region to the region to be corrected in a manner of translation or mirror symmetry.

[0011] In some embodiments, the mapping region and the region to be corrected share a boundary line, and the updating the data in the mapping region to the region to be corrected in a manner of mirror symmetry comprises: updating the data in the mapping region to the region to be corrected in a manner of mirror symmetry with the boundary line as a symmetry axis.

[0012] In some embodiments, in a case that the at least one mapping region comprises a plurality of mapping regions, the updating the data in the region to be corrected in the first image to data in at least one mapping region in the first image comprises: updating the data in the plurality of mapping regions to the region to be corrected in a manner of translation and / or mirror symmetry.

[0013] In some embodiments, along a length direction of the first image, the region to be corrected comprises two regions to be corrected arranged side by side, and the plurality of mapping regions comprises two mapping regions located on two sides of the region to be corrected; and the updating the data in the plurality of mapping regions to the region to be corrected in a manner of translation and / or mirror symmetry comprises: updating the data in each of the mapping regions to one of the regions to be corrected adjacent to it in a manner of translation and / or mirror symmetry.

[0014] In some embodiments, along the length direction of the first image, sizes of the two regions to be corrected are equal.

[0015] In another aspect, the embodiments of the present application also provide a brightness correction device of a display panel, which comprises an acquisition unit, a first processing unit, a second processing unit, a third processing unit and a correction unit; the acquisition unit is configured to acquire a first image of the display panel and generate a first image signal containing first image information; the first processing unit is electrically connected with the acquisition unit, and the first processing unit is configured to receive the first image signal, identify a bright band area in the first image, and generate a first area signal containing information of the bright band area; the second processing unit is electrically connected with the first processing unit, and the second processing unit is configured to receive the first area signal, obtain at least one mapping area according to the bright band area, and generate a second area signal containing information of the at least one mapping area; the third processing unit is electrically connected with the second processing unit, and the third processing unit is configured to receive the first area signal and the second area signal, update data in the bright band area in the first image to data in the at least one mapping area in the first image, and generate a second image and a second image signal containing second image information; and the correction unit is electrically connected with the third processing unit, and the correction unit is configured to receive the second image signal and perform brightness correction on the display panel according to the second image.

[0016] In some embodiments, the first processing unit is configured to receive the first image signal, identify a bright band area in the first image, obtain a to-be-corrected area according to the bright band area, and generate a third area signal containing information of the to-be-corrected area; the second processing unit is configured to receive the third area signal, obtain at least one mapping area according to the to-be-corrected area, and generate a fourth area signal containing information of the at least one mapping area; and the third processing unit is configured to receive the third area signal and the fourth area signal, update data in the to-be-corrected area in the first image to data in the at least one mapping area in the first image, and generate a second image and a second image signal containing second image information.

[0017] In some embodiments, the to-be-corrected area is rectangular, and a boundary of the to-be-corrected area surrounds the bright band area.

[0018] In some embodiments, when the at least one mapping area comprises one mapping area, the third processing unit is configured to update data in the one mapping area to the to-be-corrected area in a translational or mirror symmetry manner.

[0019] In some embodiments, in the case that the at least one mapping region comprises a plurality of mapping regions, the third processing unit is configured to update data in the plurality of mapping regions to the to-be-corrected region in a translational and / or mirror-symmetrical manner.

[0020] For the brightness correction method provided by the embodiments of the present application, the bright band region is effectively eliminated by updating data in the partial normal region in the first image to the bright band region. In this way, the case that the display panel obtains an image with a dark band after demura due to the interference of the original bright band data in the bright band region can be avoided, and thus the normal display effect of the display panel can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of image acquisition of a display panel in the related art;

[0022] Figure 2 is a schematic diagram of an image of a display panel acquired in the related art;

[0023] Figure 3 is a schematic diagram of an image of a display panel acquired in the related art after demura;

[0024] Figure 4 is a flowchart of a brightness correction method of a display panel provided by some embodiments of the present application;

[0025] Figure 5 is a schematic diagram of a first image in some embodiments of the present application;

[0026] Figure 6 is a schematic diagram of a second image in some embodiments of the present application;

[0027] Figure 7 is a flowchart of step S12 in some embodiments of the present application;

[0028] Figure 8 is a flowchart of a brightness correction method of a display panel provided by some embodiments of the present application;

[0029] Figure 9 is a schematic diagram of a first image in some embodiments of the present application;

[0030] Figure 10 is a schematic diagram of a first image in some embodiments of the present application;

[0031] Figure 11 is a schematic diagram of a first image in some embodiments of the present application;

[0032] Figure 12is a structural diagram of a brightness correction device of a display panel provided by some embodiments of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the ideas of the present application, and should not be regarded as limiting the protection scope of the present application.

[0034] In the description of the present application, it should be understood that the terms "first", "second" and similar words do not represent any order, number or importance, but are only used to distinguish different technical features.

[0035] "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0036] The use of "adapted for" or "configured for" in the present application means open and inclusive language, which does not exclude devices adapted for or configured to perform additional tasks or steps. In addition, the use of "based on" means open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values can be based on additional conditions or values beyond those stated in practice.

[0037] In the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any embodiment described as "exemplary" in the present application is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the present application.

[0038] The various embodiments of the present application are similar, and the features in different embodiments and / or different examples can be combined with each other.

[0039] In the related art, as shown in Figure 1 The LCD display device includes a display panel 10 and a backlight module 20, and GOA circuit 101 is usually arranged on the left and right sides of the display panel 10. The GOA circuit 101 is made of metal material, so it can reflect the light from the backlight module 20 back to the backlight module 20, so that the backlight module 20 forms a brighter band than the brightness of the backlight module 20 itself at the corresponding position, as shown in Figure 1 The light out of the positions on both sides of the backlight module 20 is relatively more.

[0040] In order to alleviate the mura (display uneven phenomenon) that occurs during the use of the display panel 10, it is usually necessary to demura the display panel 10, that is, to eliminate the display uneven phenomenon by the demura.

[0041] In the demura process, the captured image of the display panel 10 will present a bright band area 110' corresponding to the bright band of the backlight module 20 (as shown in Figure 2 At present, demura is usually performed on the bright band area 110' in the captured image, and since the display abnormality presented by the bright band area 110' is different from the mura of the display panel 10 itself, this will cause a dark band 111' to be formed at the position corresponding to the bright band area 110' after demura (as shown in Figure 3 , which will further deteriorate the normal display effect of the display panel 10.

[0042] Based on this, some embodiments of the present application provide a brightness correction method for a display panel. As shown in Figure 4 , the method comprises steps S11-S15.

[0043] S11: Capture a first image 100 of the display panel 10.

[0044] In some examples, the demura camera 30 can be used to capture the image of the display panel 10. For example, the demura camera 30 can be a CCD camera, etc.

[0045] In some examples, the same gray scale voltage can be input to all pixels of the display panel 10, and the display panel 10 is caused to display the first image 100, and then the first image 100 is captured by the demura camera 30.

[0046] S12: Identify a bright band area 110 in the first image 100.

[0047] As shown in Figure 5 , after capturing the first image 100 of the display panel 10, the bright band area 110 on the first image 100 can be seen, and the brightness at the bright band area 110 is greatly different from the brightness at the surrounding positions.

[0048] S13: Determine at least one mapping area 130 according to the bright band area 110.

[0049] The position of the mapping area 130 does not overlap with the position of the bright band area 110, thereby ensuring effective brightness correction of the bright band area 110.

[0050] In the case where the number of mapping areas 130 is one, the shape of the mapping area 130 is the same as the shape of the bright band area 110, and the size of the mapping area 130 is consistent with the size of the bright band area 110.

[0051] In the case where the number of the mapping areas 130 is multiple, the sum of the areas of all the mapping areas 130 is equal to the area of the to-be-corrected area 120. In this way, each position in the to-be-corrected area 120 can correspond to a position in the mapping area 130.

[0052] S14: updating the data at the bright band area 110 in the first image 100 to the data at the at least one mapping area 130 in the first image 100, and generating a second image 200.

[0053] In this case, the data at each position of the bright band area 110 can be updated, and the data at each position can be matched to the corresponding data in the mapping area 130, so that the bright band area 110 finally maintains the same brightness as the mapping area 130. Therefore, as shown in Figure 5 and Figure 6 indicated, compared with the bright band area 110 in the first image 100, the bright band area 110 is effectively eliminated after the second image 200 is generated.

[0054] S15: performing brightness correction on the display panel 10 according to the second image 200.

[0055] For the above brightness correction method, the bright band area 110 is effectively eliminated by updating the data in the part of the normal area in the first image 100 to the bright band area 110. In this way, the case that the display panel 10 obtains an image with a dark band after demura due to the interference of the original bright band data in the bright band area 110 can be avoided, and thus the normal display effect of the display panel 10 can be ensured.

[0056] In some embodiments, as shown in Figure 7 , the step S12 includes S121 to S123.

[0057] S111: calculating the gray scale difference value of two adjacent positions on the first image 100.

[0058] S112: comparing the size of the gray scale difference value with a preset threshold value.

[0059] S113: in the case where the gray scale difference value is greater than the preset threshold value, selecting one of the two adjacent positions as a boundary point.

[0060] Each point on the first image 100 has a gray scale value, and thus the brightness of the point is finally displayed. Therefore, by calculating the gray scale difference between two adjacent points, the brightness of the two points is compared. Since the brightness of the bright band region 110 is much greater than that of the surrounding region, the brightness of each point in the bright band region 110 is relatively uniform, and the brightness of each point in the surrounding region of the bright band region 110 is also relatively uniform. Therefore, by calculating the gray scale difference between two points, the magnitude of the brightness change can be determined, and by selecting the position with a larger change magnitude as the boundary of the bright band region 110, an accurate bright band region 110 can be determined.

[0061] In some examples, the gray scale value of any point on the first image 100 can be one of 0-255. The preset threshold value can be flexibly set according to specific requirements or test results, so as to ensure that the finally determined bright band region is consistent with the actual bright band region 110.

[0062] In some examples, step S12 can further include sequentially connecting all the boundary points on the first image 100 in a clockwise or counterclockwise direction to define the bright band region 110.

[0063] Since the bright band region 110 is a continuous closed region, a plurality of boundary points can be determined around the bright band region 110, and after sequentially connecting the plurality of boundary points in a clockwise or counterclockwise direction, the bright band region 110 can be determined.

[0064] In some examples, the bright band region 110 can be rectangular or have other irregular shapes, and the shape of the bright band region 110 is not limited in the present application.

[0065] Therefore, by the above steps, the bright band region 110 can be accurately and effectively determined, so as to ensure the accuracy of the to-be-corrected region 120.

[0066] In some embodiments, step S12 can further include selecting a point outside the bright band region 110 in the first image 100 as a reference point, calculating the gray scale difference between all points in the first image 100 and the reference point, comparing the gray scale difference with a preset threshold value, and selecting all points with a gray scale difference greater than the preset threshold value as points in the bright band region 110, so as to determine the range of the bright band region 110.

[0067] In some embodiments, as shown in FIG. 1C, after step S12, the brightness correction method further includes step S124. Figure 8

[0068] S124: Acquiring the to-be-corrected region 120 according to the bright band region 110.

[0069] As shown in FIG. 1C, after step S12, the brightness correction method further includes step S124. Figure 9 to Figure 11 ​As shown, the range of the to-be-corrected region 120 can be greater than the range of the bright band region 110, so that the luminance correction can be performed on the positions around the bright band region 110, thereby improving the final luminance correction effect.

[0070] The step S13 comprises a step S131, and the step S14 comprises a step S141.

[0071] S131: determining at least one mapping region 130 according to the to-be-corrected region 120.

[0072] S141: updating the data in the first image 100 located at the to-be-corrected region 120 to the data in the first image 100 located at the at least one mapping region 130, and generating the second image 200.

[0073] In the case where the number of the mapping regions 130 is one, the shape of the mapping region 130 is the same as that of the to-be-corrected region 120, and the size of the mapping region 130 is consistent with that of the to-be-corrected region 120.

[0074] In the case where the number of the mapping regions 130 is more than one, the sum of the areas of all the mapping regions 130 is equal to the area of the to-be-corrected region 120. In this way, each position in the to-be-corrected region 120 can correspond to a position of the mapping region 130.

[0075] Therefore, after the to-be-corrected region 120 is obtained, the luminance correction effect on the bright band region 110 can be improved by updating the data of the entire to-be-corrected region 120.

[0076] In some embodiments, as shown in FIG. 1, the to-be-corrected region 120 is a rectangle. Figure 9 to Figure 11 As shown, the shape of the to-be-corrected region 120 is a rectangle. In this way, the to-be-corrected region 120 has fewer vertices (i.e., four vertices ABCD in the figure), so that the to-be-corrected region 120 can be determined by fewer feature points. Similarly, in the subsequent determination of the mapping region 130, the range of the mapping region 130 can be determined by the feature points. In this way, the mapping region 130 can be quickly determined.

[0077] In some examples, the boundary of the to-be-corrected region 120 surrounds the bright band region 110.

[0078] For example, there is a spacing between each boundary of the bright band region 110 and the to-be-corrected region 120, so that the luminance correction can be performed on the positions around the bright band region 110, thereby improving the final luminance correction effect.

[0079] In some embodiments, as shown in FIG. 1, the to-be-corrected region 120 is a rectangle. Figure 11As shown, along the length direction of the first image 100 (for the convenience of description, the length direction of the first image 100 will be referred to as the first direction X hereinafter), the bright band region 110 includes at least one near-boundary point 1101 closest to the boundary line 1001 of the first image 100 and at least one far-boundary point 1102 farthest from the boundary line 1001.

[0080] The size L1 of the to-be-corrected region 120 in the first direction X is greater than or equal to the distance L2 between the near-boundary point 1101 and the far-boundary point 1102 in the first direction X.

[0081] In this way, by finding the near-boundary point 1101 and the far-boundary point 1102, the maximum length of the bright band region 110 in the first direction X can be quickly determined, and therefore, the width of the to-be-corrected region 120 (i.e., the size of the to-be-corrected region 120 in the first direction X) only needs to be set to be greater than or equal to the maximum length, so that the to-be-corrected region 120 can cover the bright band region 110 in the first direction X. In this way, the range of the bright band region in the first direction X can be quickly determined, thereby facilitating the quick determination of the to-be-corrected region 120.

[0082] In some examples, the size L1 of the to-be-corrected region 120 in the first direction X is greater than the distance L2 between the near-boundary point 1101 and the far-boundary point 1102 in the first direction X. In this way, the positions around the near-boundary point 1101 or the far-boundary point 1102 can be effectively corrected in brightness, thereby facilitating the improvement of the brightness correction effect on the bright band region 110.

[0083] In some examples, a point located at a first distance on the side of the near-boundary point 1101 close to the boundary line 1001 is taken as a first boundary point of the to-be-corrected region 120, and a point located at a second distance on the side of the far-boundary point 1102 away from the boundary line 1001 is taken as a second boundary point of the to-be-corrected region 120, and the distance between the first boundary point and the second boundary point in the first direction X is the width of the to-be-corrected region 120 (i.e., the size of the to-be-corrected region 120 in the first direction X). Moreover, the first boundary point and the second boundary point are two points on the boundary line of the to-be-corrected region 120. In this way, the two boundary lines of the to-be-corrected region 120 arranged in the first direction X can be quickly determined. Then, the other two boundary lines of the to-be-corrected region 120 arranged in a direction perpendicular to the first direction X are determined, and the specific position of the to-be-corrected region 120 is determined. Therefore, the above-mentioned manner can improve the determination speed of the position of the to-be-corrected region 120, thereby improving the operation efficiency of the brightness correction method.

[0084] In some examples, the first distance and the second distance can be equal or not equal. They can be set according to actual needs.

[0085] In some embodiments, such as Figure 11 As shown, along the width direction of the first image 100 (for ease of description, the width direction of the first image 100 will be referred to as the second direction Y), the bright band region 110 may also include at least one near boundary point closest to the other boundary of the first image 100 and at least one far boundary point farthest from that boundary line. The boundary line here is perpendicular to the boundary line 1001 selected when determining the range of the bright band region 110 in the first direction X. That is, the range of the bright band region 110 in the second direction Y can be determined by referring to the method described above for determining the near boundary point 1101 and the far boundary point 1102. This allows for the rapid determination of the region 120 to be corrected.

[0086] In some examples, the bright band region 110 may have vertices A and B, and the line connecting vertices A and B is a boundary line of the bright band region 110, which is parallel to the first direction X. For example, this boundary line may simultaneously serve as a boundary line of the region to be corrected 120 (in which case the length of the boundary line is the width of the region to be corrected 120) or as part of a boundary line of the region to be corrected 120 (in which case the width of the region to be corrected 120 is greater than the length of the boundary line).

[0087] In other examples, in the second direction Y, the two boundary lines opposite to the region 120 to be corrected are outside the two boundary lines opposite to the bright band region 110. In this case, the method for determining the two boundary lines opposite to the region 120 to be corrected in the second direction Y can refer to the method for determining the two boundary lines opposite to the region 120 to be corrected in the first direction X in some of the above embodiments, and will not be repeated here.

[0088] In some embodiments, since the bright band region 110 in the first image 100 can be directly observed, a region 120 to be corrected can be manually defined, such that the boundary of the region 120 to be corrected surrounds the bright band region 110.

[0089] In some embodiments, such as Figure 9 As shown, in the case where at least one mapping region 130 includes a mapping region 130, the shape and size of the mapping region 130 are exactly the same as the shape and size of the region 120 to be corrected. For example, Figure 9 The mapped region 130 (the rectangular region defined by the four boundary points FJKH) and the region to be corrected 120 (the rectangular region defined by the four boundary points EFHG) have the same shape and size.

[0090] Step S14 includes: updating the data located in the mapping area 130 to the area to be corrected 120 by translation or mirror symmetry, and generating a second image.

[0091] In the case that the data is copied from the mapping region 130 to the to-be-corrected region 120 in a translational manner, the to-be-corrected region 120 is sequentially provided with two boundary points (for example, boundary point G and boundary point H) in the first direction X, and the mapping region 130 is sequentially provided with two boundary points (for example, boundary point H and boundary point K) at corresponding positions in the first direction X. At this time, the data of the boundary point H in the mapping region 130 is copied to the boundary point G in the to-be-corrected region 120, and the data of the boundary point K in the mapping region 130 is copied to the boundary point H in the to-be-corrected region 120.

[0092] In the case that the data is updated from the mapping region 130 to the to-be-corrected region 120 in a mirror-symmetrical manner, the to-be-corrected region 120 is sequentially provided with two boundary points (for example, boundary point G and boundary point H) in the first direction X, and the mapping region 130 is sequentially provided with two boundary points (for example, boundary point H and boundary point K) at corresponding positions in the first direction X. At this time, the data of the boundary point H in the mapping region 130 is copied to the boundary point H in the to-be-corrected region 120, and the data of the boundary point K in the mapping region 130 is copied to the boundary point G in the to-be-corrected region 120.

[0093] In some embodiments, the mapping region 130 and the to-be-corrected region 120 can be arranged with a gap therebetween, that is, the mapping region 130 and the to-be-corrected region 120 overlap at a boundary line. In this way, the interference that can be formed in the area around the bright band region 110 can be further reduced, and the to-be-corrected region 120 can be more uniform in brightness with other positions after brightness correction.

[0094] In some other embodiments, the mapping region 130 and the to-be-corrected region 120 can share a boundary line, that is, the mapping region 130 and the to-be-corrected region 120 overlap at the boundary line. In this way, the transition of the boundary line of the to-be-corrected region 120 can be smoother, and the fragmentation of the to-be-corrected region 120 after brightness correction can be reduced.

[0095] In the case that the data is updated from the mapping region 130 to the to-be-corrected region 120 in a mirror-symmetrical manner, the boundary line shared by the mapping region 130 and the to-be-corrected region 120 can be a symmetry axis, so that the data in the mapping region 130 is updated to the to-be-corrected region 120 in a mirror-symmetrical manner.

[0096] In some embodiments, as shown in FIG. 2, the mapping region 130 and the to-be-corrected region 120 can be arranged with a gap therebetween, that is, the mapping region 130 and the to-be-corrected region 120 overlap at a boundary line. In this way, the interference that can be formed in the area around the bright band region 110 can be further reduced, and the to-be-corrected region 120 can be more uniform in brightness with other positions after brightness correction. Figure 10As shown, in the case where the at least one mapping region 130 includes a plurality of mapping regions 130, the plurality of mapping regions 130 can be translated one by one to the corresponding positions in the to-be-corrected region 120 and fill the to-be-corrected region 120. For example, Figure 10 As shown in the middle, two mapping regions 130 (a first rectangular region defined by four boundary points MEGN and a first rectangular region defined by four boundary points FPQH) are shown, the to-be-corrected region 120 (a rectangular region defined by four boundary points EFHG) can be divided into two to-be-corrected sub-regions (a first to-be-corrected sub-region 121 defined by four boundary points EUVG and a second to-be-corrected sub-region 122 defined by four boundary points UFHV), the first rectangular region can be translated to the first to-be-corrected sub-region 121, and the second rectangular region can be translated to the second to-be-corrected sub-region 122, so that the two mapping regions 130 can fill the to-be-corrected region 120.

[0097] In this case, the step S14 includes: updating the data in the plurality of mapping regions 130 to the corresponding to-be-corrected sub-regions in the to-be-corrected region 120 in a manner of translation and / or mirror symmetry, and generating a second image.

[0098] In this way, the data at a plurality of positions can be updated to the to-be-corrected region 120. In this way, it is beneficial to avoid the problem that the area of the mapping region 130 is too large due to the small number of mapping regions 130, and further avoid the problem that the mapping region 130 has uneven brightness at some positions due to the large area.

[0099] In some embodiments, as shown in the left, Figure 10 As shown, along the length direction of the image 100 (i.e., along the first direction X), the to-be-corrected region 120 includes two to-be-corrected sub-regions (for example, the first to-be-corrected sub-region 121 and the second to-be-corrected sub-region 122) arranged side by side, and the plurality of mapping regions 130 includes two mapping regions (for example, the first mapping region 131 and the second mapping region 132) located on both sides of the to-be-corrected region 120.

[0100] In this case, updating the data in the plurality of mapping regions 130 to the corresponding to-be-corrected sub-regions in the to-be-corrected region 120 in a manner of translation and / or mirror symmetry includes: updating the data in each mapping region 130 to one to-be-corrected sub-region adjacent to it in a manner of translation and / or mirror symmetry.

[0101] As shown in the right, Figure 10As shown, the first mapping region 131 is closer to the first to-be-corrected sub-region 121 than the second mapping region 132, and thus the data in the first mapping region 131 can be copied to the first to-be-corrected sub-region 121 in a manner of translation or mirror symmetry. Similarly, the data in the second mapping region 132 can also be updated to the second to-be-corrected sub-region 122 in a manner of translation or mirror symmetry.

[0102] Therefore, by the above manner, the to-be-corrected sub-region receives data from the mapping region close to it, which is conducive to making the boundary transition of the to-be-corrected sub-region smoother and reducing the sense of fragmentation.

[0103] In some examples, the data in the first mapping region 131 can be updated to the first to-be-corrected sub-region 121 in a manner of mirror symmetry, which is conducive to making the transition between the corrected first to-be-corrected sub-region 121 and the first mapping region 131 smoother, thereby improving the brightness correction effect.

[0104] In some examples, the data in the second mapping region 132 can be updated to the second to-be-corrected sub-region 122 in a manner of mirror symmetry, which is conducive to making the transition between the corrected first to-be-corrected sub-region 121 and the first mapping region 131 smoother, thereby improving the brightness correction effect.

[0105] In some embodiments, as shown, Figure 10 The widths (i.e., the sizes of the to-be-corrected sub-regions in the first direction X) of the two to-be-corrected sub-regions are equal. This can make the areas of the first mapping region 131 and the second mapping region 132 also equal, which is conducive to ensuring the brightness display effect of the to-be-corrected region 120 after brightness correction.

[0106] In other embodiments, the widths of the two to-be-corrected sub-regions can also be unequal.

[0107] For example, the width of the to-be-corrected sub-region closer to the boundary line of the first image 100 is smaller than the width of the to-be-corrected sub-region farther away from the boundary line. This can avoid the problem that there is not enough space to set a mapping region (such as the first mapping region 131) due to the distance between the boundary line of the first image 100 and the to-be-corrected region 120 being too small.

[0108] In related technologies, when the display panel is detected for mura, the mura phenomenon can be detected when an ND filter with a light transmittance of 1%-4% is used. Such a display panel is difficult to meet the shipment requirements. After correction by the above brightness correction method, mura detection is performed on six different models of display panels, and Table 1 data is obtained.

[0109]

[0110]

[0111] Table 1

[0112] Specifically, L24, L48 and L128 in Table 1 represent different gray scales, "ND" represents that the mura defect is detected by using an ND filter, and 5% represents the transmittance of the ND filter. The greater the transmittance of the ND filter, the less obvious the mura defect. "JND" represents that the mura defect is detected by using the human eye. It can be seen from the above data that when the detection is performed by using the human eye, the peripheral band-shaped mura is not obvious. When the mura is detected by using the ND filter, the mura can be detected only when the transmittance of the ND filter is at least 5%, which can meet the delivery requirements of the display panel.

[0113] Some embodiments of the present application also provide a brightness correction device of a display panel, as shown in Figure 12 The brightness correction device 40 includes an acquisition unit 41, a first processing unit 42, a second processing unit 43, a third processing unit 44 and a correction unit 45.

[0114] The acquisition unit 41 is configured to acquire a first image of the display panel and generate a first image signal containing first image information.

[0115] The first processing unit 42 is electrically connected to the acquisition unit 41, and the first processing unit 42 is configured to receive the first image signal, identify a bright band area in the first image, and generate a first area signal containing bright band area information.

[0116] The second processing unit 43 is electrically connected to the first processing unit 42, and the second processing unit 43 is configured to receive the first area signal, obtain at least one mapping area according to the bright band area, and generate a second area signal containing information of the at least one mapping area.

[0117] The third processing unit 44 is electrically connected to the second processing unit 43, and the third processing unit 44 is configured to receive the first area signal and the second area signal, update data in the bright band area in the first image to data in the at least one mapping area in the first image, and generate a second image and a second image signal containing second image information.

[0118] For example, the second processing unit 43 not only generates the second area signal, but also sends the first area signal received by the second processing unit 43 to the third processing unit 44.

[0119] The correction unit 45 is electrically connected to the third processing unit 44, and the correction unit 45 is configured to receive the second image signal and perform brightness correction on the display panel according to the second image.

[0120] Therefore, by using the brightness correction device, each step in the brightness correction method can be performed, so that the data in the partial normal area in the image is updated to the bright band area, thereby effectively eliminating the bright band area. In this way, the bright band area 110 can be formed on the first image due to the reflection of the GOA circuit, and the original bright band data in the bright band area 110 can cause the display panel 10 to have a dark band on the image obtained after demura, thereby ensuring the normal display effect of the display panel 10.

[0121] In some embodiments, the first processing unit 42 is configured to receive the first image signal, identify the bright band area in the first image, obtain the to-be-corrected area according to the bright band area, and generate a third area signal containing information of the to-be-corrected area. The second processing unit 43 is configured to receive the third area signal, obtain at least one mapping area according to the to-be-corrected area, and generate a fourth area signal containing information of the at least one mapping area. The third processing unit 44 is configured to receive the third area signal and the fourth area signal, update the data in the to-be-corrected area in the first image to the data in the at least one mapping area in the first image, and generate a second image and a second image signal containing information of the second image.

[0122] In some embodiments, the range of the to-be-corrected area 120 is greater than the range of the bright band area 110, so that the positions around the bright band area 110 can be brightness corrected, thereby improving the final brightness correction effect.

[0123] In some examples, the functions of at least two of the first processing unit 42, the second processing unit 43, and the third processing unit 44 can be performed by one processor.

[0124] In some embodiments, the to-be-corrected area is rectangular. In this way, the to-be-corrected area has fewer vertices, so that the to-be-corrected area can be determined by fewer feature points. In addition, in the subsequent determination of the mapping area, the range of the mapping area can be determined by the feature points. In this way, the mapping area can be quickly determined.

[0125] In some examples, the boundary of the to-be-corrected area surrounds the bright band area. In this way, the positions around the bright band area can be brightness corrected, thereby improving the final brightness correction effect.

[0126] In some embodiments, in the case that the at least one mapping region comprises one mapping region, the third processing unit 44 is configured to update the data in the mapping region to the region to be corrected in a translational or mirror-symmetrical manner.

[0127] In some embodiments, in the case that the at least one mapping region comprises a plurality of mapping regions, the third processing unit 44 is configured to update the data in the plurality of mapping regions to the region to be corrected in a translational and / or mirror-symmetrical manner.

[0128] In some embodiments, the luminance correction device 40 can implement any step of the above-mentioned luminance correction method, and thus can have the technical effects of the luminance correction method described in any of the above-mentioned embodiments, which will not be repeated here.

[0129] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only for helping to understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. A method for brightness correction of a display panel, characterized in that, comprising: acquiring a first image of a display panel; identifying a bright band region in the first image; acquiring a to-be-corrected region according to the bright band region, the to-be-corrected region being in a rectangular shape, and a boundary of the to-be-corrected region surrounding the bright band region; along a length direction of the first image, the bright band region including at least one near-boundary point closest to a boundary line of the first image and at least one far-boundary point farthest from the boundary line; and along the length direction of the first image, a size of the to-be-corrected region being greater than or equal to a distance between the near-boundary point and the far-boundary point; acquiring at least one mapping region according to the to-be-corrected region; updating data in the first image located in the to-be-corrected region to data in the first image located in at least one of the mapping regions, and generating a second image; and performing brightness correction on the display panel according to the second image. The identifying the bright band region in the first image comprises:

2. The brightness correction method of a display panel according to claim 1, wherein calculating a gray scale difference value of two adjacent points on the first image; comparing the gray scale difference value with a preset threshold value; and in a case where the gray scale difference value is greater than the preset threshold value, selecting one of the two adjacent points as a boundary point of the bright band region. In a case where the at least one mapping region includes one mapping region, the updating the data in the first image located in the to-be-corrected region to the data in the first image located in at least one of the mapping regions comprises:

3. The brightness correction method of the display panel according to any one of claims 1-2, wherein, updating data located in the one mapping region to the to-be-corrected region in a manner of translation or mirror symmetry. The mapping region and the to-be-corrected region share a boundary line, and the updating the data located in the mapping region to the to-be-corrected region in a manner of mirror symmetry comprises:

4. The method of brightness correction of a display panel according to claim 3, wherein updating the data located in the mapping region to the to-be-corrected region in a manner of mirror symmetry with the boundary line as a symmetry axis. In a case where the at least one mapping region includes a plurality of mapping regions, the updating the data in the first image located in the to-be-corrected region to the data in the first image located in at least one of the mapping regions comprises:

5. The brightness correction method of the display panel according to any one of claims 1-2, wherein, updating data in the plurality of mapping regions to the to-be-corrected region in a manner of translation and / or mirror symmetry. Along the length direction of the first image, the to-be-corrected region includes two to-be-corrected sub-regions arranged side by side, and the plurality of mapping regions include two mapping regions located on two sides of the to-be-corrected region; 6. The method of brightness correction of a display panel according to claim 5, wherein, The updating the data in the plurality of mapping regions to the to-be-corrected region in a manner of translation and / or mirror symmetry comprises: updating the data in each of the mapping regions to one of the to-be-corrected sub-regions adjacent to the mapping region in a manner of translation and / or mirror symmetry. Along the length direction of the first image, sizes of the two to-be-corrected sub-regions are equal.

7. The method of brightness correction of a display panel according to claim 6, wherein, The brightness correction device comprises:

8. A luminance correction device of a display panel, characterized by comprising: ​ The acquisition unit is configured to acquire a first image of the display panel and generate a first image signal containing information of the first image; The first processing unit is electrically connected with the acquisition unit, and is configured to receive the first image signal, identify a bright band area in the first image, obtain a to-be-corrected area according to the bright band area, and generate a third area signal containing information of the to-be-corrected area; The second processing unit is electrically connected with the first processing unit, and is configured to receive the third area signal, obtain at least one mapping area according to the to-be-corrected area, and generate a fourth area signal containing information of the at least one mapping area; The third processing unit is electrically connected with the second processing unit, and is configured to receive the third area signal and the fourth area signal, update data in the to-be-corrected area in the first image to data in the at least one mapping area in the first image, generate a second image and a second image signal containing information of the second image, and The correction unit is electrically connected with the third processing unit, and is configured to receive the second image signal and perform brightness correction on the display panel according to the second image.

9. The luminance correction device of the display panel according to claim 8, wherein In the case where the at least one mapping area includes one mapping area, the third processing unit is configured to update data in the one mapping area to the to-be-corrected area in a translational or mirror symmetry manner.

10. The luminance correction device of the display panel according to claim 8, wherein In the case where the at least one mapping area includes a plurality of mapping areas, the third processing unit is configured to update data in the plurality of mapping areas to the to-be-corrected area in a translational and / or mirror symmetry manner.

Images