Brightness compensation method and apparatus therefor

Abstract

The present application provides a brightness compensation method and device thereof, the method comprising: obtaining brightness values of each sampling point (selected from a plurality of pixel units) of a display panel at a preset gray scale; determining a reference brightness value of the display panel according to the plurality of brightness values; obtaining a preset threshold value, and judging whether the brightness of the display panel is abnormal according to the preset threshold value, the reference brightness value and the plurality of brightness values; if the brightness of the display panel is abnormal, compensating the brightness of the display panel or marking the display panel as unqualified; otherwise, not compensating the brightness of the display panel, thereby improving the efficiency of brightness compensation of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to the manufacturing of display devices, and more particularly to a brightness compensation method and device thereof. BACKGROUND

[0002] Due to the process and other reasons, the LCD (Liquid Crystal Display) product has the problem of uneven brightness when displaying the picture, and the optical compensation is usually used to improve it.

[0003] However, for the more serious uneven brightness phenomenon, the first optical compensation may not be able to completely compensate, and the second optical compensation is usually required. At present, the second optical compensation is carried out for all panels of the model with serious uneven brightness phenomenon without distinction, that is, even if part of the panels of the model are qualified after the first optical compensation, the second optical compensation is still carried out, resulting in a long overall time consumption of the optical compensation of the liquid crystal panel.

[0004] Therefore, the existing LCD product has the above problems, and needs to be improved. SUMMARY

[0005] The present application aims to provide a brightness compensation method and device to improve the technical problem of long overall time consumption caused by the second optical compensation of all display panels of the same model.

[0006] The present application provides a brightness compensation method applied to a display panel, the display panel comprising a plurality of pixel units and a plurality of sampling points, the plurality of sampling points being selected from the plurality of pixel units, comprising:

[0007] obtaining the brightness value of each sampling point of the display panel at a preset gray scale;

[0008] determining the reference brightness value of the display panel according to the plurality of brightness values;

[0009] obtaining a preset threshold value, and judging whether the brightness of the display panel is abnormal according to the preset threshold value, the reference brightness value and the plurality of brightness values;

[0010] if the brightness of the display panel is abnormal, compensating the brightness of the display panel or marking the display panel as unqualified;

[0011] otherwise, not compensating the brightness of the display panel.

[0012] In an embodiment, the pixel unit comprises first, second and third sub-pixels with different colors.

[0013] The step of obtaining the luminance value of each sampling point of the display panel at the preset gray scale comprises:

[0014] obtaining a first luminance value corresponding to the first sub-pixel, a second luminance value corresponding to the second sub-pixel and a third luminance value corresponding to the third sub-pixel of each sampling point at the preset gray scale;

[0015] determining the luminance value of each sampling point according to the first luminance value, the second luminance value and the third luminance value of each sampling point.

[0016] In an embodiment, the step of determining the luminance value of each sampling point according to the first luminance value, the second luminance value and the third luminance value of each sampling point comprises:

[0017] obtaining a reference matrix, and determining a stimulus value corresponding to the first sub-pixel, the second sub-pixel or the third sub-pixel according to the reference matrix, the first luminance value, the second luminance value and the third luminance value;

[0018] determining a reference stimulus value according to a plurality of stimulus values of a plurality of sampling points;

[0019] determining the luminance value of each sampling point according to each stimulus value and the reference stimulus value.

[0020] In an embodiment, the step of obtaining the reference matrix comprises:

[0021] obtaining a first standard luminance value of a first monochrome picture of the display panel at a maximum gray scale value of the first sub-pixel, a second standard luminance value of a second monochrome picture at the maximum gray scale value of the second sub-pixel, and a third standard luminance value of a third monochrome picture at the maximum gray scale value of the third sub-pixel;

[0022] obtaining three first sub-standard stimulus values of the first monochrome picture, three second sub-standard stimulus values of the second monochrome picture, and three third sub-standard stimulus values of the third monochrome picture of the display panel;

[0023] determining the reference matrix according to the first standard luminance value, the second standard luminance value, the third standard luminance value, the three first sub-standard stimulus values, the three second sub-standard stimulus values and the three third sub-standard stimulus values.

[0024] In an embodiment, the step of determining the reference luminance value of the display panel according to a plurality of luminance values comprises:

[0025] According to the distribution of the plurality of sampling points, the display panel is divided into a plurality of regions, each of the regions comprising a corresponding plurality of the sampling points;

[0026] According to the plurality of luminance values corresponding to each of the regions, a sub-reference luminance value of each of the sampling points in each of the regions is determined, and the plurality of sub-reference luminance values constitute the reference luminance value.

[0027] In an embodiment, the step of determining the sub-reference luminance value of each of the sampling points in each of the regions according to the plurality of luminance values corresponding to each of the regions comprises:

[0028] According to the plurality of luminance values corresponding to each of the regions and the positions of the corresponding plurality of sampling points, a corresponding data curve is fitted;

[0029] Based on the data curve, the corresponding sub-reference luminance value is determined according to the position of each of the sampling points in the corresponding region.

[0030] In an embodiment, the step of dividing the display panel into a plurality of regions according to the distribution of the plurality of sampling points, each of the regions comprising a corresponding plurality of the sampling points comprises:

[0031] According to the distribution of the plurality of sampling points, the display panel is divided into a plurality of first regions along a first direction and a plurality of second regions along a second direction, each of the sampling points being contained in a first region and a second region, the plurality of first regions and the plurality of second regions constituting the plurality of regions;

[0032] According to the plurality of luminance values corresponding to each of the regions and the positions of the corresponding plurality of sampling points, a corresponding data curve is fitted;

[0033] According to the plurality of luminance values corresponding to each of the first regions and the positions of the corresponding plurality of sampling points, a corresponding first data curve is fitted;

[0034] According to the plurality of luminance values corresponding to each of the second regions and the positions of the corresponding plurality of sampling points, a corresponding second data curve is fitted, and the plurality of first data curves and the plurality of second data curves constitute the plurality of data curves;

[0035] According to the plurality of luminance values corresponding to each of the regions and the positions of the corresponding plurality of sampling points, a corresponding data curve is fitted;

[0036] Based on the first data curve, a first sub-reference luminance value is determined according to the position of each of the sampling points in the corresponding first region.

[0037] determining a second sub-reference luminance value corresponding to each of the sampling points in the second region according to the position of the corresponding sampling point based on the second data curve, wherein the sub-reference luminance value of each of the sampling points comprises the first sub-reference luminance value and the second sub-reference luminance value.

[0038] In an embodiment, the step of determining whether the luminance of the display panel is abnormal according to the preset threshold, the reference luminance value and the plurality of luminance values comprises:

[0039] determining a first sub-error value corresponding to each of the sampling points according to the luminance value of each of the sampling points and the first sub-reference luminance value corresponding to the sampling point, and setting a sum of absolute values of differences between the plurality of first sub-error values and a first sub-pre-set threshold as a first sub-error sum;

[0040] determining a second sub-error value corresponding to each of the sampling points according to the luminance value of each of the sampling points and the second sub-reference luminance value corresponding to the sampling point, and setting a sum of absolute values of differences between the plurality of second sub-error values and a second sub-pre-set threshold as a second sub-error sum;

[0041] determining whether the luminance of the display panel is abnormal according to a size relationship between the first sub-error sum and a third sub-pre-set threshold and a size relationship between the second sub-error sum and a fourth sub-pre-set threshold, wherein the first sub-pre-set threshold, the second sub-pre-set threshold, the third sub-pre-set threshold and the fourth sub-pre-set threshold constitute the preset threshold.

[0042] In an embodiment, the step of determining whether the luminance of the display panel is abnormal according to a size relationship between the first sub-error sum and a third sub-pre-set threshold and a size relationship between the second sub-error sum and a fourth sub-pre-set threshold comprises:

[0043] if at least one of the first sub-error sum being greater than or equal to the third sub-pre-set threshold and the second sub-error sum being greater than or equal to the fourth sub-pre-set threshold is true, determining that the luminance of the display panel is abnormal;

[0044] wherein the step of compensating the luminance of the display panel comprises:

[0045] if the first sub-error sum is greater than or equal to the third sub-pre-set threshold, compensating the sampling point according to the first sub-error value corresponding to the sampling point to adjust the luminance value corresponding to the sampling point until the first sub-error sum corresponding to the sampling point is less than the third sub-pre-set threshold;

[0046] If the second sub-error sum is greater than or equal to the fourth sub-pre-set threshold value, the sampling point is compensated according to the corresponding second sub-error value to adjust the corresponding luminance value until the corresponding second sub-error sum is less than the fourth sub-pre-set threshold value.

[0047] The present application provides a luminance compensation device for executing program instructions to implement the luminance compensation method as described in any of the above.

[0048] The present application provides a luminance compensation method and device, which determines the reference luminance value of the display panel by obtaining the luminance value of the sampling point at a preset gray scale, and compares the difference between the luminance value of the plurality of sampling points and the reference luminance value based on a preset threshold value to determine whether the display panel is qualified, and only the unqualified display panel is subjected to secondary optical compensation processing or marked as unqualified, while the qualified display panel can skip the secondary optical compensation, thereby saving the overall time consumption; and during the secondary optical compensation, the luminance of the plurality of sampling points can also be compensated in a targeted manner according to the reference luminance value and the plurality of luminance values of the plurality of sampling points, thereby improving the accuracy of the display panel luminance compensation. BRIEF DESCRIPTION OF DRAWINGS

[0049] The present application will be further described below with reference to the drawings. It should be noted that the drawings in the following description are only used to explain some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0050] Figure 1 、 Figures 3 to 9 are eight flowcharts of the luminance compensation method provided by the embodiments of the present application, respectively.

[0051] Figure 2 is a top view schematic diagram of the display panel provided by the embodiments of the present application. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0053] In the description of the present application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In addition, it should be noted that the drawings provided are only relatively close to the structures of the present application, and some details that are not closely related to the application are omitted, the purpose is to simplify the drawings and make the invention points clear, and not to indicate that the actual device is exactly the same as the drawings Figure 1 The drawings provided are only relatively close to the structures of the present application, and some details that are not closely related to the application are omitted, the purpose is to simplify the drawings and make the invention points clear, and not to indicate that the actual device is exactly the same as the drawings

[0054] In this paper, "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0055] The present application provides a brightness compensation method applied to a display panel, which can include but is not limited to the following embodiments and combinations of the following embodiments.

[0056] In an embodiment, as shown in Figure 1 The brightness compensation method can include but is not limited to the following steps and combinations of the following steps.

[0057] S1, obtaining the brightness value of each sampling point of the display panel at a preset gray scale.

[0058] In the present embodiment, the display panel can be a liquid crystal display panel or a self-luminous display panel. Due to process, material and other differences, when the display panel displays a gray scale picture (i.e. the gray scale values of multiple sub-pixels of different colors in each pixel unit are equal), the brightness of some positions is brighter or darker compared with the entire picture, which presents the phenomenon of uneven brightness of the display picture.

[0059] Specifically, as shown in Figure 2As shown, for ease of description, a plurality of pixel units (P11, P12, …, Pmn) in the display panel 100 are arranged along the row direction D1 and the column direction D2, for example, arranged as m rows and n columns (m and n are both positive integers), then the plurality of pixel units in the first row can be P11, P12, …, P1n in turn, the plurality of pixel units in the second row can be P21, P22, …, P2n in turn, the plurality of pixel units in the mth row can be Pm1, Pm2, …, Pmn in turn, the plurality of pixel units in the first column can be P11, P21, …, Pm1 in turn, the plurality of pixel units in the second column can be P12, P22, …, Pm2 in turn, and the plurality of pixel units in the nth column can be P1n, P2n, …, Pmn in turn.

[0060] Based on that the display panel includes a plurality of pixel units, the plurality of sampling points in step S1 can be selected from the plurality of pixel units. Based on that the display panel includes a plurality of pixel units, the plurality of sampling points in step S1 can be selected from the plurality of pixel units. Figure 2 Based on the plurality of pixel units in the display panel, for example, the number of the plurality of sampling points is p*q (p and q are both positive integers), a plurality of pixel units arranged uniformly and at intervals in the row direction can be selected as the plurality of sampling points (for example, the plurality of sampling points in the first row are C11, C12, …, C1p in turn, the plurality of sampling points in the second row are C21, C22, …, C2p in turn, and the plurality of sampling points in the qth row are Cq1, Cq2, …, Cqp in turn), and a plurality of pixel units arranged uniformly and at intervals in the column direction can also be selected as the plurality of sampling points (for example, the plurality of sampling points in the first column are C11, C21, …, Cq1 in turn, the plurality of sampling points in the second column are C12, C22, …, Cq2 in turn, and the plurality of sampling points in the pth column are C1p, C2p, …, Cqp in turn), and the number of the sampling points in each row of the plurality of rows of pixel units including the sampling points is the same (for example, p, which can be 241), and the number of the sampling points in each column of the plurality of columns of pixel units including the sampling points is the same (for example, q, which can be 136), and the number of the pixel units between adjacent two sampling points in the row direction and the column direction is not limited herein and can be the same or different.

[0061] In the embodiment, the specific value of the preset gray scale is not limited, and since the sensitivity of the human eye to low brightness is high, the gray scale corresponding to low brightness can be used to determine the uniformity of the display panel, for example, the preset gray scale can be equal to 25. The brightness value herein can be understood as the brightness value of each pixel unit when the gray scale value is equal to the preset gray scale. Further, it can be understood that the brightness value of each pixel unit is the brightness value when the gray scale values of the plurality of sub-pixels of different colors in each pixel unit are all equal to the preset gray scale.

[0062] In an embodiment, as shown in Figure 2As shown, the pixel unit (which can be any one of P11 to Pmn) includes first, second and third sub-pixels P1, P2 and P3 of different colors; wherein, as shown in Figure 3 As shown, the step S1 can include but is not limited to the following steps and combinations thereof.

[0063] S11, obtaining a first luminance value corresponding to the first sub-pixel, a second luminance value corresponding to the second sub-pixel and a third luminance value corresponding to the third sub-pixel of each sampling point at the preset gray scale.

[0064] Wherein, the first, second and third sub-pixels P1, P2 and P3 can be red, green and green sub-pixels respectively. As discussed above, based on the pixel unit including first, second and third sub-pixels P1, P2 and P3 of different colors, since the colors and materials of the three are different, even if they all emit light at the same preset gray scale, they can have first, second and third luminance values R, G and B respectively, and the luminance values of the three can be different.

[0065] Specifically, the gray scale picture presented by all first sub-pixels P1, all second sub-pixels P2 and all third sub-pixels P3 in the display panel 100 emitting light at the same preset gray scale can be displayed by a camera, and further the luminance value (i.e. the first, second and third luminance values R, G and B) of each sub-pixel of each sampling point in the gray scale picture can be obtained.

[0066] S12, determining the luminance value of the sampling point according to the first, second and third luminance values of each sampling point.

[0067] Wherein, the specific functional relationship between the luminance value of each sampling point and the corresponding first, second and third luminance values in the embodiment is not limited, which is intended to show that the luminance value of the sampling point is related to the luminance values of the corresponding multiple sub-pixels, for example, the luminance value of each sampling point can be equal to the sum of the corresponding first, second and third luminance values.

[0068] Specifically, as shown, the step S12 can include but is not limited to the following steps and combinations thereof. Figure 4 As shown, the step S12 can include but is not limited to the following steps and combinations thereof.

[0069] S121, obtaining a reference matrix, and determining the stimulus value corresponding to the first, second or third sub-pixel according to the reference matrix, the first, second and third luminance values.

[0070] Wherein, based on the pixel unit includes a first sub-pixel P1, a second sub-pixel P2 and a third sub-pixel P3, the first sub-pixel P1 can have a corresponding first stimulus value X, the second sub-pixel P2 can have a corresponding second stimulus value Y, and the third sub-pixel P3 can have a corresponding third stimulus value Z. Correspondingly, the reference matrix M here can include nine elements arranged in 3*3, and the first stimulus value X, the second stimulus value Y, the third stimulus value Z, the first brightness value R, the second brightness value G, the third brightness value B and the reference matrix M can satisfy the following relationship:

[0071] [X Y Z]’=M*[R G B]’;

[0072] Wherein, the expression of the reference matrix M can be as follows:

[0073]

[0074] Specifically, the nine elements m1 to m9 in the reference matrix M are filled with corresponding numerical values, respectively, and the relationship between the first stimulus value X, the second stimulus value Y, the third stimulus value Z, the first brightness value R, the second brightness value G, the third brightness value B and the reference matrix M can be further expressed as:

[0075]

[0076] It can be understood that in the three-color system, the amount of the three primary color stimuli required for the to-be-measured light to achieve color matching, i.e. the first stimulus value X, the second stimulus value Y and the third stimulus value Z here, respectively represent three axes of the color space, the X axis represents the intensity of red light, the Y axis represents the intensity of green light, and the Z axis represents the intensity of blue light. Therefore, it can be understood that any color can be represented by its proportions in these three directions. Among them, the second stimulus value Y can represent the brightness of the light emitted by the pixel unit, and the first stimulus value X and the third stimulus value Z can represent the chroma of the light emitted by the pixel unit.

[0077] Therefore, the stimulus value determined in step S121 can be the second stimulus value Y corresponding to the green sub-pixel (i.e. the second sub-pixel P2). That is, here only the second stimulus value Y corresponding to the second sub-pixel P2 in each sampling point can be determined, and the plurality of second stimulus values Y corresponding to the plurality of sampling points can be arranged into a corresponding Y matrix according to the relative distribution mode of the positions of the plurality of sampling points.

[0078] Wherein, as shown in Figure 5 The step S121 here can include, but is not limited to, the following steps and combinations of the following steps.

[0079] S1211, obtain a first standard luminance value of a first monochrome picture of the display panel when the gray scale of the first sub-pixel is a maximum gray scale value, a second standard luminance value of a second monochrome picture when the gray scale of the second sub-pixel is the maximum gray scale value, and a third standard luminance value of a third monochrome picture when the gray scale of the third sub-pixel is the maximum gray scale value.

[0080] As discussed above, the reference matrix M can include nine elements arranged in 3*3, and the reference matrix M can be considered to be related to the properties of the camera, that is, different cameras have different reference matrix M. Based on the reference matrix M of the same camera, the corresponding first stimulus value X, the second stimulus value Y, and the third stimulus value Z can be calculated according to the first luminance value R, the second luminance value G, and the third luminance value B of the photographed picture. Therefore, it is considered that the reference matrix M of the camera can be determined in advance according to some pictures.

[0081] Specifically, the first monochrome picture here can be understood as a pure red picture in which only the first sub-pixel emits light at the maximum gray scale value in each pixel unit, and the corresponding first standard luminance value R0 is the sum of the luminance values of all first sub-pixels (at this time, the luminance values of the other two sub-pixels can be 0). The second monochrome picture can be understood as a pure green picture in which only the second sub-pixel emits light at the maximum gray scale value in each pixel unit, and the corresponding second standard luminance value G0 is the sum of the luminance values of all second sub-pixels (at this time, the luminance values of the other two sub-pixels can be 0). The third monochrome picture can be understood as a pure blue picture in which only the third sub-pixel emits light at the maximum gray scale value in each pixel unit, and the corresponding third standard luminance value B0 is the sum of the luminance values of all third sub-pixels (at this time, the luminance values of the other two sub-pixels can be 0). For example, if the range of the gray scale value is 0 to 255, the maximum gray scale value here is 255.

[0082] S1212, obtain three first sub-standard stimulus values of the first monochrome picture, three second sub-standard stimulus values of the second monochrome picture, and three third sub-standard stimulus values of the third monochrome picture.

[0083] Specifically, the above three first standard stimulus values (X1, Y1, Z1, corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel, respectively), the second standard stimulus values (X2, Y2, Z2, corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel, respectively), and the third standard stimulus values (X3, Y3, Z3, corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel, respectively) can be obtained by, but not limited to, the CA410 color analyzer.

[0084] S1213, determining the reference matrix according to the first standard luminance value, the second standard luminance value, the third standard luminance value, three first sub-standard stimulus values, three second sub-standard stimulus values and three third sub-standard stimulus values.

[0085] Similarly, according to the relationship [X Y Z]' = M*[R G B]', nine elements in the reference matrix M can be solved through nine equations corresponding to the relationship [X1 Y1 Z1]' = M*[R0 0 0]', [X2 Y2 Z2]' = M*[R0 0 0]', [X3 Y3 Z3]' = M*[R0 0 0]', so as to determine the reference matrix M.

[0086] It should be noted that, if the display panel 100 is a liquid crystal display panel, the initial luminance of the display panel can be set as follows before determining the reference matrix M:

[0087] (1) Place the display panel after the first optical compensation (i.e. the display panel before step S1 in the present application, which has not been assembled with the backlight) on the backlight assembly;

[0088] (2) Based on the backlight luminance of the current backlight assembly, control all sub-pixels of the display panel to emit light at 25 gray scale, and obtain the luminance of the center region of the display panel;

[0089] (3) Adjust the luminance of the backlight assembly until the luminance of the center region of the display panel is about 5 nit.

[0090] It should be noted that the values of "25 gray scale", "the size of the center region" and "5 nit" in the above setting can be set according to user requirements, and the above values are not set here, but are only used for illustration.

[0091] After the above step S121, the following steps S122 to S123 can also be included.

[0092] S122, determining a reference stimulus value according to the plurality of stimulus values of the plurality of sampling points.

[0093] The reference stimulus value mean(Y) can be the average value of the plurality of stimulus values corresponding to the plurality of sampling points, i.e. equal to the mean value of the Y matrix. Since the plurality of sampling points are uniformly distributed, the reference stimulus value mean(Y) can also be understood as the actual average luminance value of the display panel 100 emitting light at the preset gray scale.

[0094] S123, determining the luminance value of the sampling point according to each stimulus value and the reference stimulus value.

[0095] Specifically, the stimulus value of the sampling point determined in step S121 (i.e., the second stimulus value Y, belonging to the XYZ color space) can be converted into the luminance value L in the Lab color space by the Lab color space and XYZ color space conversion method, and the specific conversion relationship is L = 116 * (Y / mean(Y))^(1 / 3)-16, i.e., the luminance value L of each sampling point can be determined to form the L matrix.

[0096] In the foregoing steps S11 to S12, the execution object of S121 can be each pixel unit rather than each sampling point, i.e., until step S121, the determined Y matrix can include all second stimulus values Y corresponding to all pixel units, and further, on this basis, the second stimulus value Y threshold can be determined according to the size relationship of all second stimulus values Y, so that the pixel units with the second stimulus value Y greater than the threshold are all divided into the effective display area, and the subsequent discussion is based on the effective display area, i.e., further, the multiple sampling points meeting the above requirements can be determined in the effective display area.

[0097] Of course, it can also be considered that the sampling points in other embodiments belong to the above-mentioned effective display area. That is, the reference stimulus value in step S122 can correspond to the average value of the Y matrix of the multiple sampling points in the effective display area, and in step S123, the luminance value L of each sampling point in the effective display area is determined.

[0098] After the above step S1, the following steps S2 to S5 can also be included.

[0099] S2, determining the reference luminance value of the display panel according to the multiple luminance values.

[0100] Here, it can be understood that the reference luminance value of the display panel as a whole can be determined by the multiple luminance values of the known multiple sampling points, i.e., it can be calculated from these luminance values.

[0101] As shown in the foregoing steps S1 and S2, the step S2 can include but is not limited to the following steps and combinations of the following steps. Figure 6

[0102] S21, dividing the display panel into multiple regions according to the distribution of the multiple sampling points, each region including a corresponding plurality of sampling points.

[0103] As known from the foregoing discussion, each sampling point has a corresponding luminance value, and therefore, the region including a plurality of sampling points also has at least a plurality of corresponding luminance values.

[0104] ​S22, determining a sub-reference luminance value of each sampling point in each region according to the plurality of luminance values corresponding to the region, and the plurality of sub-reference luminance values constitute the reference luminance value.

[0105] As discussed above in relation to step S2, it can also be understood here that the sub-reference luminance value of each sampling point in each region can also be calculated from the plurality of luminance values corresponding to the region.

[0106] Further, as shown in FIG. 2, step S22 can include, but is not limited to, the following steps and combinations thereof. Figure 7

[0107] S221, fitting a corresponding data curve according to the plurality of luminance values corresponding to each region and the positions of the plurality of sampling points.

[0108] Specifically, the abscissa of the data curve can represent the distance between each sampling point (all located in the same direction of the far point) and the origin (previously determined), and the ordinate can represent the luminance value of the sampling point. Then, according to the known "distance" and corresponding luminance value of the sampling point, a polynomial model "y=a n *x^n+a (n-1) *x^(n-1)+…+a1*x+a0" can be used to obtain the polynomial function of the data curve. Wherein, a n may be 10, 11 or 12, y corresponds to the luminance value, and x corresponds to the "distance".

[0109] S222, determining the corresponding sub-reference luminance value according to the position of each sampling point in the corresponding region based on the data curve.

[0110] It should be noted that although the above data curve is fitted from the plurality of luminance values and the plurality of "distances" of the plurality of sampling points, the number of sampling points is generally much larger than the above a n , so that the plurality of luminance values and the plurality of "distances" of the plurality of sampling points are not necessarily finally located on the fitted data curve. That is, based on the polynomial function corresponding to the data curve, the corresponding sub-reference luminance value (with a high probability not equal to the original "luminance value") can be determined according to the "distance" corresponding to the position of the sampling point.

[0111] In an embodiment, as shown in FIG. 2, step S21 can include, but is not limited to, the following steps: Figure 8

[0112] ​​S211, based on the distribution of the plurality of sampling points, the display panel is divided into a plurality of first regions along a first direction and a plurality of second regions along a second direction, each sampling point being included in a first region and a second region, and the plurality of first regions and the plurality of second regions constituting the plurality of regions.

[0113] Specifically, such as Figure 2 As shown, for example, in the arrangement of the sampling point matrix, the first direction here can be the row direction D1 mentioned above, and the second direction can be the column direction D2 mentioned above. Correspondingly, multiple first regions (A1, A2...Ap) correspond one-to-one with multiple columns of sampling points. Each first region can include a corresponding column of sampling points. For example, the first region A1 can include sampling points C11, C21...Cq1. Multiple second regions (B1, B2...Bq) correspond one-to-one with multiple rows of sampling points. Each second region can include a corresponding row of sampling points. For example, the second region B1 can include sampling points C11, C12...C1p.

[0114] At this point, at least one first region and at least one second region are set in an overlapping manner, further, for example... Figure 2 In this regard, each first region can overlap with all second regions, and each second region can overlap with all first regions. That is, each sampling point can be contained in a first region and a second region.

[0115] Following step S211, step S221 may include, but is not limited to, the following steps and combinations thereof.

[0116] S2211, based on the multiple brightness values ​​corresponding to each of the first regions and the positions of the multiple sampling points corresponding to them, a corresponding first data curve is fitted.

[0117] Multiple first regions (A1, A2...Ap) are arranged along row direction D1. Referring to the discussion in step S221, for each first region, the sampling points contained are multiple sampling points located in the same column. Therefore, the fitted first data curve can characterize the brightness value change trend of the display panel in the vertical direction at that horizontal position (the horizontal position of the first region), and can also be called the vertical data curve at that horizontal position. The position of each sampling point in each first region can be represented by the "distance" between that sampling point and the top or bottom sampling point of that column.

[0118] Since p equals 241, meaning there are 241 columns of sampling points, there are also 241 corresponding first data curves.

[0119] S2212, fitting a corresponding second data curve according to the plurality of luminance values and the positions of the plurality of sampling points corresponding to each of the second regions, the plurality of first data curves and the plurality of second data curves constituting the plurality of data curves.

[0120] The plurality of second regions (B1, B2, …, Bq) are arranged along the column direction D2. Similarly, for each second region, the sampling points included are the sampling points in the same row, and thus the fitted second data curve can represent the luminance value variation trend of the display panel in the horizontal direction at the vertical position (the vertical position of the first region), which can also be referred to as the horizontal data curve at the vertical position. The position of each sampling point in each second region can be represented by the “distance” of the sampling point from the sampling point at the top or bottom end of the row of sampling points.

[0121] Based on q being equal to 136, i.e., the sampling points have 136 rows, there are 136 corresponding second data curves.

[0122] After steps S211, S2211, and S2212, step S222 can include, but is not limited to, the following steps and combinations thereof.

[0123] S2221, determining a corresponding first sub-reference luminance value according to the position of each sampling point in the corresponding first region based on the first data curve.

[0124] Referring to the description of step S222, for each first region, a plurality of first sub-reference luminance values can be determined based on the respective first data curve and according to the “distance” of the plurality of sampling points, i.e., the plurality of first sub-reference luminance values are the luminance values that conform to the first data curve of the plurality of sampling points, rather than the luminance values obtained in the previous step.

[0125] S2222, determining a corresponding second sub-reference luminance value according to the position of each sampling point in the corresponding second region based on the second data curve, the sub-reference luminance value of each sampling point including the corresponding first sub-reference luminance value and the corresponding second sub-reference luminance value.

[0126] Similarly, referring to the description of step S222, for each second region, a plurality of second sub-reference luminance values can be determined based on the respective second data curve and according to the “distance” of the plurality of sampling points, i.e., the plurality of second sub-reference luminance values are the luminance values that conform to the second data curve of the plurality of sampling points, rather than the luminance values obtained in the previous step.

[0127] Therefore, the sub-reference brightness value of each sampling point can include a first sub-reference brightness value corresponding to the vertical data curve and a second sub-reference brightness value corresponding to the horizontal data curve. The two represent the theoretical brightness values ​​of the sampling point in the vertical and horizontal directions, respectively.

[0128] Following step S2 above, steps S3 to S5 may also be included.

[0129] S3, obtain a preset threshold, and determine whether the brightness of the display panel is abnormal based on the preset threshold, the reference brightness value and multiple brightness values.

[0130] As discussed in the previous section on step S2, the reference brightness value is derived from multiple brightness values ​​at multiple sampling points and can characterize the overall brightness value of the display panel. Therefore, based on a preset threshold, the relationship between the differences between multiple brightness values ​​and the reference brightness value and the preset threshold can be determined, thereby determining whether the brightness of the display panel is abnormal.

[0131] Specifically, such as Figure 9 As shown, following steps S211, S2211, S2212, S2221 and S2222, step S3 here may include, but is not limited to, the following steps and combinations thereof.

[0132] S31, based on the brightness value of each sampling point and the corresponding first sub-reference brightness value, determine the corresponding first sub-error value, and set the sum of the absolute values ​​of the differences between multiple first sub-error values ​​and the first sub-preset threshold as the first sub-error sum.

[0133] Specifically, since the first sub-reference brightness value represents the theoretical brightness value of the sampling point in the vertical direction, the corresponding first sub-error value represents the error value of the brightness value of the sampling point in the vertical direction compared with the corresponding vertical data curve. Furthermore, the first sub-error value of each sampling point can be calculated to obtain the vertical error value matrix. After adding them together, the first sub-error of all samples and ΔV are obtained, which can roughly characterize the error of the brightness value of the display panel in the vertical direction.

[0134] The first sub-preset threshold can be set according to customer requirements. The smaller the first sub-preset threshold, the higher the brightness compensation accuracy.

[0135] S32, based on the brightness value of each sampling point and the corresponding second sub-reference brightness value, determine the corresponding second sub-error value, and set the sum of the absolute values ​​of the differences between multiple second sub-error values ​​and the second sub-preset threshold as the second sub-error sum.

[0136] Similarly, the second sub-error value represents the error value of the luminance value of the sampling point in the horizontal direction compared with the corresponding horizontal data curve. Further, the second sub-error value of each sampling point can be calculated to obtain a horizontal error value matrix, and the second sub-error sum ΔH of all samples can be obtained after addition, which can approximately represent the error condition of the luminance value of the display panel in the horizontal direction.

[0137] The second sub-pre-set threshold value can refer to the above description of the first sub-pre-set threshold value.

[0138] S33, according to the size relationship between the first sub-error sum and the third sub-pre-set threshold value and the size relationship between the second sub-error sum and the fourth sub-pre-set threshold value, judging whether the luminance of the display panel is abnormal, the first sub-pre-set threshold value, the second sub-pre-set threshold value, the third sub-pre-set threshold value and the fourth sub-pre-set threshold value constitute the pre-set threshold value.

[0139] It can be understood that, since the plurality of first regions and the plurality of second regions belong to the display panel 100, it can be considered that if at least one of the first sub-error sum is greater than or equal to the third sub-pre-set threshold value and the second sub-error sum is greater than or equal to the fourth sub-pre-set threshold value, the luminance of the display panel is judged to be abnormal.

[0140] Therefore, it can be considered that the first sub-error sum ΔV of any first region is large, that is, the error of the luminance of the first region in the vertical direction is large, and / or the second sub-error sum ΔH of any second region is large, that is, the error of the luminance of the second region in the horizontal direction is large, which are all judged to be abnormal in the luminance of the display panel.

[0141] The third sub-pre-set threshold value and the fourth sub-pre-set threshold value can also refer to the above description of the first sub-pre-set threshold value.

[0142] Further, step S33 can also be replaced by:

[0143] According to the first sub-error sum and the standard deviation stdmean(Y) of the Y matrix, the first sub-error sum objective evaluation value V1=(ΔV)^(1 / 2.2) / 4+stdmean(Y) is determined.

[0144] According to the second sub-error sum and the standard deviation stdmean(Y) of the Y matrix, the second sub-error sum objective evaluation value V2=(ΔH)^(1 / 2.2) / 4+stdmean(Y) is determined.

[0145] If at least one of the first sub-error sum objective evaluation value is greater than or equal to the fifth sub-pre-set threshold value and the second sub-error sum objective evaluation value is greater than or equal to the sixth pre-set threshold value, the luminance of the display panel is judged to be abnormal.

[0146] It can be understood that, compared with step S33, the above steps correspond to linear processing of the first sub-error sum and the second sub-error by the standard deviation stdmean(Y) of the Y matrix, to obtain smaller V1 and V2, so that the overall evaluation value is more accurate.

[0147] Similarly, the fifth sub-preset threshold and the sixth sub-preset threshold can also refer to the above discussion about the first sub-preset threshold. For example, the fifth sub-preset threshold and the sixth sub-preset threshold can be 15 and 20, respectively.

[0148] If the brightness of the display panel is abnormal, the following steps are performed:

[0149] S4, compensating the brightness of the display panel or marking the display panel as unqualified.

[0150] Specifically, if the first sub-error sum is greater than or equal to the third sub-preset threshold, the sampling point is compensated according to the corresponding first sub-error value to adjust the corresponding brightness value until the corresponding first sub-error sum is less than the third sub-preset threshold; if the second sub-error sum is greater than or equal to the fourth sub-preset threshold, the sampling point is compensated according to the corresponding second sub-error value to adjust the corresponding brightness value until the corresponding second sub-error sum is less than the fourth sub-preset threshold.

[0151] That is, by calculating the first sub-error sum and the second sub-error sum in the present application, on the one hand, it can be used to judge whether the brightness of the display panel is abnormal, and when it is abnormal, the sampling point can be compensated to obtain the corresponding compensation value according to the difference between the first sub-error value and the third sub-preset threshold, and the sampling point can be compensated to obtain the corresponding compensation value according to the difference between the second sub-error value and the fourth sub-preset threshold.

[0152] Further, the pixel units of other non-sampling points in the plane space of the sampling points can be linearly interpolated to determine the compensation value at the preset gray level.

[0153] It should be noted that if the display panel is still judged to have abnormal brightness after being compensated twice by the optical compensation method, that is, the display panel in the above step S1 has been compensated twice by the optical compensation method, then even if the brightness of the display panel is abnormal, it is not necessary to continue to compensate the brightness of the display panel, and the display panel can be directly marked as unqualified.

[0154] Otherwise, the following steps are performed:

[0155] S5, not compensating the brightness of the display panel.

[0156] It can be understood that, in the present application, the reference luminance value of the display panel is determined by acquiring the luminance value of the sampling point at the preset gray scale, and based on the preset threshold, the difference between the luminance values of the plurality of sampling points and the reference luminance value is compared to determine whether the luminance of the display panel is abnormal, based on this determination, only the display panel with abnormal luminance is subjected to secondary optical compensation processing, and the display panel with normal luminance can skip the secondary optical compensation, thereby saving the time consumption of overall luminance compensation; and during the secondary optical compensation, the luminance of the plurality of sampling points can also be compensated in a targeted manner according to the reference luminance value and the plurality of luminance values of the plurality of sampling points, thereby improving the accuracy of the display panel luminance compensation.

[0157] Of course, the present application can also provide a luminance compensation device for executing program instructions to implement the luminance compensation method as described in any of the above. Specifically, the luminance compensation device is a device independent of the display panel, for performing the above information acquisition, determination and compensation on the display panel, and the luminance compensation device can be a detection station, a detection system or a detection machine.

[0158] The present application provides a luminance compensation method and device, which determines the reference luminance value of the display panel by acquiring the luminance value of the sampling point at the preset gray scale, and based on the preset threshold, compares the difference between the luminance values of the plurality of sampling points and the reference luminance value to determine whether the display panel is qualified, and only the unqualified display panel is subjected to secondary optical compensation processing or marked as unqualified, while the qualified display panel can skip the secondary optical compensation, thereby saving the overall time consumption; and during the secondary optical compensation, the luminance of the plurality of sampling points can also be compensated in a targeted manner according to the reference luminance value and the plurality of luminance values of the plurality of sampling points, thereby improving the accuracy of the display panel luminance compensation.

[0159] The luminance compensation method and device provided by the embodiments of the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific examples; the above description of the embodiments is only used to help understand the technical solutions and core ideas of the present application; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A luminance compensation method characterized by, The application is applied to a display panel, the display panel comprises a plurality of pixel units and a plurality of sampling points, the pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel with different colors, the plurality of sampling points are selected from the plurality of pixel units, and the display panel comprises the following steps: The display panel is obtained under a preset gray scale, and the brightness value of each sampling point comprises: obtaining the first brightness value corresponding to the first sub-pixel, the second brightness value corresponding to the second sub-pixel and the third brightness value corresponding to the third sub-pixel of each sampling point under the preset gray scale; the first standard brightness value of the first monochrome picture of the display panel under the gray scale of the first sub-pixel is the maximum gray scale value, the second standard brightness value of the second monochrome picture under the gray scale of the second sub-pixel is the maximum gray scale value, the third standard brightness value of the third monochrome picture under the gray scale of the third sub-pixel is the maximum gray scale value; the first monochrome picture of the display panel is obtained, and the three first sub-standard stimulus values of the first monochrome picture, the three second sub-standard stimulus values of the second monochrome picture and the three third sub-standard stimulus values of the third monochrome picture are obtained; the reference matrix is determined according to the first standard brightness value, the second standard brightness value, the third standard brightness value, the three first sub-standard stimulus values, the three second sub-standard stimulus values and the three third sub-standard stimulus values; the stimulus value corresponding to the first sub-pixel, the second sub-pixel or the third sub-pixel is determined according to the reference matrix, the first brightness value, the second brightness value and the third brightness value; the reference stimulus value is determined according to the plurality of stimulus values of the plurality of sampling points; the brightness value of the sampling point is determined according to each stimulus value and the reference stimulus value; The reference brightness value of the display panel is determined according to the plurality of brightness values; A preset threshold value is obtained, and whether the brightness of the display panel is abnormal is judged according to the preset threshold value, the reference brightness value and the plurality of brightness values; If the brightness of the display panel is abnormal, the brightness of the display panel is compensated or the display panel is marked as unqualified; Otherwise, the brightness of the display panel is not compensated.

2. The brightness compensation method of claim 1, wherein, The step of determining the reference brightness value of the display panel according to the plurality of brightness values comprises: According to the distribution of the plurality of sampling points, the display panel is divided into a plurality of regions, and each region comprises a plurality of corresponding sampling points; According to the plurality of brightness values corresponding to each region, the sub-reference brightness value of each sampling point in each region is determined, and the plurality of sub-reference brightness values constitute the reference brightness value.

3. The brightness compensation method of claim 2, wherein, The step of determining the sub-reference brightness value of each sampling point in each region according to the plurality of brightness values corresponding to each region comprises: According to the plurality of brightness values corresponding to each region and the positions of the plurality of corresponding sampling points, a corresponding data curve is fitted; Based on the data curve, the corresponding sub-reference brightness value is determined according to the position of each sampling point in the corresponding region.

4. The brightness compensation method of claim 3, wherein, The step of dividing the display panel into a plurality of regions according to the distribution of the plurality of sampling points, each of the regions comprising a corresponding plurality of the sampling points, comprises: The display panel is divided into a plurality of first regions along a first direction and a plurality of second regions along a second direction according to the distribution of the plurality of sampling points, each of the sampling points being contained in a first region and a second region, the plurality of first regions and the plurality of second regions constituting the plurality of regions; The step of fitting a corresponding data curve according to the corresponding plurality of luminance values and the positions of the corresponding plurality of sampling points of each of the regions comprises: Fitting a corresponding first data curve according to the corresponding plurality of luminance values and the positions of the corresponding plurality of sampling points of each of the first regions; Fitting a corresponding second data curve according to the corresponding plurality of luminance values and the positions of the corresponding plurality of sampling points of each of the second regions, the plurality of first data curves and the plurality of second data curves constituting the plurality of data curves; The step of determining the corresponding sub-reference luminance value of each of the sampling points in the corresponding region based on the data curve comprises: Determining a corresponding first sub-reference luminance value of each of the sampling points in the corresponding first region based on the first data curve; Determining a corresponding second sub-reference luminance value of each of the sampling points in the corresponding second region based on the second data curve, the sub-reference luminance value of each of the sampling points comprising the corresponding first sub-reference luminance value and the corresponding second sub-reference luminance value.

5. The brightness compensation method of claim 4, wherein, The step of determining whether the luminance of the display panel is abnormal according to the preset threshold, the reference luminance value, and the plurality of luminance values comprises: Determining a corresponding first sub-error value according to the luminance value and the corresponding first sub-reference luminance value of each of the sampling points, and setting the sum of the absolute values of the differences between the plurality of first sub-error values and a first sub-pre-set threshold as a first sub-error sum; Determining a corresponding second sub-error value according to the luminance value and the corresponding second sub-reference luminance value of each of the sampling points, and setting the sum of the absolute values of the differences between the plurality of second sub-error values and a second sub-pre-set threshold as a second sub-error sum; Determining whether the luminance of the display panel is abnormal according to the size relationship between the first sub-error sum and a third sub-pre-set threshold and the size relationship between the second sub-error sum and a fourth sub-pre-set threshold, the first sub-pre-set threshold, the second sub-pre-set threshold, the third sub-pre-set threshold, and the fourth sub-pre-set threshold constituting the preset threshold.

6. The brightness compensation method of claim 5, wherein, The step of determining whether the luminance of the display panel is abnormal according to the size relationship between the first sub-error sum and a third sub-pre-set threshold and the size relationship between the second sub-error sum and a fourth sub-pre-set threshold comprises: If at least one of the first sub-error and is greater than or equal to the third sub-pre-set threshold value and the second sub-error and is greater than or equal to the fourth sub-pre-set threshold value is true, it is judged that the brightness of the display panel is abnormal; The step of compensating the brightness of the display panel comprises: If the first sub-error and is greater than or equal to the third sub-pre-set threshold value, the sampling point is compensated according to the corresponding first sub-error value to adjust the corresponding brightness value until the corresponding first sub-error and is less than the third sub-pre-set threshold value. If the second sub-error and is greater than or equal to the fourth sub-pre-set threshold value, the sampling point is compensated according to the corresponding second sub-error value to adjust the corresponding brightness value until the corresponding second sub-error and is less than the fourth sub-pre-set threshold value.

7. A luminance compensating apparatus characterized by comprising: A computer program product for executing program instructions to implement the brightness compensation method as claimed in any one of claims 1 to 6.

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