Method for testing image persistence of display panel and related device

Abstract

The present application provides a method and related device for ghosting testing of a display panel. The ghosting testing method includes: causing the display panel to display a medium gray-scale image, and obtaining first luminance data of a plurality of first test areas and a plurality of second test areas in the display panel; wherein, the first test area and the second test area within the same test group are symmetrically arranged with respect to the first central axis of the display panel; causing the display panel on one side of the first central axis to display a black image, and causing the display panel on the other side of the first central axis to display a white image; causing the display panel to display a medium gray-scale image, and obtaining second luminance data of the plurality of first test areas and the plurality of second test areas; obtaining a first ghosting parameter based on the first luminance data and the second luminance data of the first test area and the second test area within the same test group; and obtaining a second ghosting parameter by using the first ghosting parameters of a plurality of test groups. The above method can improve the matching degree between the ghosting test result and the visual result.

Description

Technical Field

[0001] This application belongs to the field of display technology, and particularly relates to a method for testing image sticking of a display panel and related devices. Background Art

[0002] Image sticking of a display panel refers to the phenomenon that after the display panel displays a previous static image for a period of time, the image or outline of the previous image still appears when the display panel displays the next image. Therefore, before the display panel leaves the factory, it is necessary to test the image sticking level of the display panel to ensure the display effect of the display panel after leaving the factory.

[0003] However, the image sticking test results obtained by using the existing image sticking test method to test a display panel with poor brightness uniformity cannot be well matched with the visual results. Summary of the Invention

[0004] This application provides a method for testing image sticking of a display panel and related devices to improve the matching degree between the image sticking test results and the visual results.

[0005] To solve the above technical problems, a technical solution adopted by this application is: to provide a method for testing image sticking of a display panel, including: making the display panel display a middle gray-scale image, and obtaining first brightness data of a plurality of first test areas and a plurality of second test areas in the display panel; wherein, the display panel is provided with a first selected area and a second selected area, a plurality of the first test areas are arranged in the first selected area, a plurality of the second test areas are arranged in the second selected area, and one of the first test areas and one of the second test areas form a test group, and the first test area and the second test area in the same test group are symmetrically arranged about the first central axis of the display panel; making the display panel on one side of the first central axis display a black image, and making the display panel on the other side of the first central axis display a white image; making the display panel display the middle gray-scale image, and obtaining second brightness data of the plurality of first test areas and the plurality of second test areas; obtaining a first image sticking parameter according to the first brightness data and the second brightness data of the first test area and the second test area in the same test group; and obtaining a second image sticking parameter by using the first image sticking parameters of the plurality of test groups.

[0006] To solve the above technical problems, another technical solution adopted by this application is: to provide an image sticking test device for a display panel, including a memory and a processor which are coupled to each other, wherein program instructions are stored in the memory, and the processor is configured to execute the program instructions to implement the image sticking test method described in any one of the above embodiments.

[0007] To solve the above technical problems, another technical solution adopted by this application is: to provide a storage device storing program instructions that can be run by a processor, and the program instructions are used to implement the afterimage test method described in any of the above embodiments.

[0008] Different from the prior art situation, the beneficial effect of this application is that in the afterimage test method provided by this application, the display panel has at least one set of a first selected area and a second selected area; and multiple first test areas are arranged in the first selected area, and multiple second test areas are arranged in the second selected area. A first test area and a second test area form a test group, and the first test area and the second test area in the same test group are symmetrically arranged with respect to the first central axis of the display panel. Subsequently, first afterimage parameters can be obtained based on the brightness data of the first test area and the second test area in the same test group before and after the black and white block aging, and second afterimage parameters can be obtained based on the first afterimage parameters of multiple test groups. In this application, the first selected area and the second selected area are subdivided. The areas of the subdivided first test area and the second test area are small, and the brightness uniformity in the subdivided first test area and the second test area is good. Based on the second afterimage parameters obtained from the subdivided first test area and the second test area, the phenomenon of mismatch between the data quantization result and the visual result caused by uneven brightness in the first selected area and the second selected area can be reduced, so that the afterimage test result is more accurate.

[0009] In addition, the first distances between the first test area and the second test area in each test group after the subdivision of the first selected area are different. The contribution degree (i.e., the first weight value) of each test group to the second afterimage parameter can be determined according to the first distance of each test group. The matching degree between the second afterimage parameter calculated based on the contribution degree of each test group and the visual result is better, and the result is more accurate. Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, where:

[0011] Figure 1 It is a schematic flowchart of an implementation manner of the afterimage test method for the display panel of this application;

[0012] Figure 2 It is a schematic structural diagram of an implementation manner of the display panel;

[0013] Figure 3a It is a schematic structural diagram of the display panel showing black and white blocks in an implementation manner;

[0014] Figure 3b Schematic diagram of the structure of another embodiment for the display panel to display black and white blocks;

[0015] Figure 4 Schematic diagram of the structure of another embodiment of the display panel;

[0016] Figure 5a Schematic diagram of the brightness data of the first selected area and multiple first test areas collected at different collection times after entering step S103;

[0017] Figure 5b Schematic diagram of the brightness data of the second selected area and multiple second test areas collected at different collection times after entering step S103;

[0018] Figure 6 Schematic diagram of the structure of an embodiment of the afterimage test device for the display panel of the present application;

[0019] Figure 7 Schematic diagram of the structure of an embodiment of the storage device of the present application. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0021] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic flowchart of an embodiment of the afterimage test method for the display panel of the present application, Figure 2 is a schematic diagram of the structure of an embodiment of the display panel. The display panel can be an OLED display panel, an LED display panel, a liquid crystal display panel, etc. The afterimage test method provided by the present application includes:

[0022] S101: Cause the display panel 1 to display a medium gray level image, and obtain the first brightness data of multiple first test areas a and multiple second test areas b in the display panel 1; wherein, the display panel 1 is provided with a first selected area A and a second selected area B, multiple first test areas a are arranged in the first selected area A, multiple second test areas b are arranged in the second selected area B, and one first test area a and one second test area b form a test group 10, and the first test area a and the second test area b in the same test group 10 are symmetrically arranged with respect to the first central axis L1 of the display panel 1.

[0023] Specifically, as Figure 2 shown, Figure 2 a group of first selected regions A and second selected regions B are schematically drawn. Generally speaking, the central region of the display panel 1 is a region that is more obvious to the human eye. Therefore, the first selected regions A and the second selected regions B within the same group may include parts located in the central region of the display panel 1.

[0024] Optionally, the first selected regions A and the second selected regions B are symmetrically arranged with respect to the first central axis L1 of the display panel 1. There is a preset interval D between the first selected regions A and the first central axis L1. The preset interval D can be 0.3 - 0.8 mm, for example, 0.5 mm, etc. On the one hand, the setting of the preset interval D can make the first selected regions A located as close as possible to the central position of the display panel 1; on the other hand, when performing black-and-white block aging later, it is divided by the first central axis L1, and the brightness data deviation at the position of the first central axis L1 is relatively large; the setting of the preset interval D can make the first selected regions A and the second selected regions B avoid the interface during black-and-white block segmentation, so that the subsequent obtained second afterimage parameters are more accurate.

[0025] As Figure 2 shown, the above-mentioned first central axis L1 can be parallel to the long side of the display panel 1; of course, in other embodiments, the first central axis L1 can also be parallel to the short side of the display panel 1. Further, when the display panel 1 further includes a second central axis L2 perpendicular to the first central axis L1, the first selected regions A can also be symmetrically arranged with respect to the second central axis L2, and the second selected regions B can also be symmetrically arranged with respect to the second central axis L2. This design method can make the first selected regions A and the second selected regions B located as close as possible to the central region of the display panel 1, so that the subsequent obtained second afterimage parameters are more matched with the visual result. The specific sizes of the first selected regions A and the second selected regions B can be adjusted according to actual needs. For example, when the first central axis L1 is parallel to the long side of the display panel 1, the length of the first selected regions A can be about 40% of the long side length of the display panel 1, and the width of the first selected regions A can be about 10% of the short side length of the display panel 1.

[0026] In addition, before performing the above step S101, the afterimage test method provided by the present application may further include: dividing the display panel 1 to obtain at least one group of first selected areas A and second selected areas B; wherein, the first selected area A and the second selected area B within the same group are symmetrically arranged with respect to the first central axis L1; dividing the first selected area A to obtain a plurality of first test areas a, and dividing the second selected area B to obtain a plurality of second test areas b; wherein, the plurality of first test areas a and the plurality of second test areas b are arranged side by side along a direction perpendicular to the first central axis L1 (i.e., along the second central axis L2). The above way of dividing the display panel 1 is relatively simple. Of course, in other embodiments, other dividing methods may also be adopted; for example, some of the plurality of first test areas a are arranged side by side along a direction perpendicular to the first central axis L1, and some are arranged side by side along the first central axis L1. However, no matter what kind of dividing method is used, as long as the first test area a and the second test area b within the same test group 10 are symmetrically arranged with respect to the first central axis L1. In an application scenario, as Figure 2 shown in Figure 2 the first selected area A is subdivided into four first test areas a, the second selected area B is subdivided into four second test areas b, and one first test area a corresponds to one second test area b and forms a test group 10; that is Figure 2 four test groups 10 are formed in

[0027] Preferably, the shapes and areas of all the first test areas a and the second test areas b are the same; for example, as Figure 2 shown in, the first test area a and the second test area b are rectangles with the same area. This design method can reduce the difficulty of subdividing the first selected area A and the second selected area B. Of course, in other embodiments, the shapes and sizes of the plurality of first test areas a may also be different, and the present application does not limit this. For example, in the direction away from the first central axis L1, the area of the first test area a may gradually increase. Since the area farther away from the first central axis L1 has less influence on the visual result, the above design method has little influence on the result of the final second afterimage parameter.

[0028] Furthermore, as Figure 2 shown in, when the display panel 1 includes a second central axis L2 perpendicular to the first central axis L1, each first test area a is symmetric with respect to the second central axis L2, and each second test area b is symmetric with respect to the second central axis L2. This design method can make the first test area a and the second test area b as much as possible located in the central area of the display panel 1, so that the subsequent obtained second afterimage parameter is more matched with the visual result.

[0029] In addition, the medium gray level in the above step S101 refers to any gray level between the highest gray level and the lowest gray level. Assuming that the highest gray level of the current display panel 1 is 255 and the lowest gray level is 0, the above medium gray level can be any gray level between 0 and 255. The first luminance data of the first test area a and the second test area b in the above step S101 can be collected and obtained by a luminance acquisition device, and the luminance acquisition device can be a luminance meter or the like. Specifically, in this embodiment, the luminance values at multiple positions in the first test area a can be obtained by the luminance acquisition device, and the average value of the luminance values at multiple positions is used as the first luminance data of the first test area a; and the luminance values at multiple positions in the second test area b can be obtained by the luminance acquisition device, and the average value of the luminance values at multiple positions is used as the second luminance data of the second test area b.

[0030] S102: Make the display panel 1 on one side of the first central axis L1 display a black screen, and the display panel 1 on the other side of the first central axis L1 display a white screen.

[0031] Specifically, as Figure 3a shown, Figure 3a is a schematic structural diagram of an embodiment of the display panel showing black and white blocks. In Figure 3a , the display panel 1 on the left side of the first central axis L1 displays a black screen, and the display panel 1 on the right side of the first central axis L1 displays a white screen; at this time, corresponding to Figure 2 , Figure 2 , the first selected area A displays a black screen, and the second selected area B displays a white screen. Of course, in other embodiments, the way the display panel 1 displays black and white blocks can also be other. As Figure 3b shown, Figure 3b is a schematic structural diagram of another embodiment of the display panel showing black and white blocks. In Figure 3b , the display panel 1 on the left side of the first central axis L1 displays a white screen, and the display panel 1 on the right side of the first central axis L1 displays a black screen; at this time, corresponding to Figure 2 , Figure 2 , the first selected area A displays a white screen, and the second selected area B displays a black screen.

[0032] In addition, when performing the above step S102, the duration of this step S102 (that is, the duration for which the display panel 1 displays black and white blocks) can be set; for example, the duration can be 1 minute, 5 minutes, 10 minutes, etc. By changing the duration, the afterimage test results under different durations can be obtained; subsequently, R & D personnel can optimize aspects such as the power of the display panel according to the afterimage test results under different durations.

[0033] S103: Make the display panel 1 display a medium gray-level image, and obtain the second luminance data of multiple first test areas a and multiple second test areas b.

[0034] Specifically, for the sake of comparability, the medium gray-level image displayed in step S103 is the same as the medium gray-level image displayed in step S101; the second luminance data of the first test areas a and the second test areas b can be collected by a luminance acquisition device. The specific process of obtaining the second luminance data is the same as that of the first luminance data, which will not be elaborated here.

[0035] S104: Obtain the first afterimage parameter according to the first luminance data and the second luminance data of the first test areas a and the second test areas b within the same test group.

[0036] Specifically, the implementation process of the above step S104 can be as follows: obtain the first sum value and the first difference value between the first luminance data of the first test area a and the first luminance data of the second test area b within the same test group, and obtain the second sum value and the second difference value between the second luminance data of the first test area a and the second luminance data of the second test area b within the same test group; obtain the first ratio of the first difference value to the first sum value, and obtain the second ratio of the second difference value to the second sum value; take the absolute value of the difference between the second ratio and the first ratio as the first afterimage parameter. Expressed by the formula as follows:

[0037] Among them, IS1 is the first afterimage parameter, and the unit can be JND; I(t)a is the second luminance data of the first test area a, I(t)b is the second luminance data of the second test area a, I(0)a is the first luminance data of the first test area a, and I(0)b is the first luminance data of the second test area b. The process of calculating the first afterimage parameter is relatively simple and the calculation amount is small.

[0038] In an application scenario, as Figure 2 shown in Figure 2 there are four test groups 10 formed in

[0039] S105: Obtain the second afterimage parameter by using the first afterimage parameters of multiple test groups 10.

[0040] In the above design method, the first selected area A and the second selected area B are subdivided. After subdivision, the areas of the first test area a and the second test area b are smaller, and the brightness uniformity of the first test area a and the second test area b after subdivision is better. Based on the second afterimage parameters obtained from the subdivided first test area a and second test area b, the phenomenon of mismatch between the data quantization result and the visual result caused by uneven brightness within the first selected area A and the second selected area B can be reduced, so that the afterimage test result is more accurate.

[0041] In one embodiment, the specific implementation process of the above step S105 may be: obtaining the second afterimage parameter by using the first afterimage parameters of multiple test groups 10 and the corresponding first weight values; wherein, the greater the first distance between the first test area a and the second test area b in the same test group 10, the smaller the first weight value. Generally speaking, the closer the position is to the junction of the black and white blocks (i.e., the first central axis L1), the more obvious the afterimage is visually, and the greater the first weight value set correspondingly. That is, the present application can determine the contribution degree (i.e., the first weight value) of each test group 10 to the second afterimage parameter according to the first distance between the first test area a and the second test area b within each test group 10. The second afterimage parameter calculated based on the contribution degree of each test group 10 has a better match with the visual result, and the result is more accurate.

[0042] Further, the step of obtaining the second afterimage parameter by using the first afterimage parameters of multiple test groups and the corresponding first weight values specifically includes: obtaining the first product between the first afterimage parameter of each test group and the corresponding first weight value; wherein, the sum of all the first weight values is one; and taking the sum of all the first products as the second afterimage parameter. It is expressed by the formula as follows:

[0043] Wherein, IS2 is the second afterimage parameter, with the unit of JND; IS1(i) is the first afterimage parameter of the i-th test group, λ1(i) is the first weight value corresponding to the first afterimage parameter of the i-th test group, and n is the total number of test groups formed by the first selected area A and the second selected area B. The above method for calculating the second afterimage parameter is relatively simple and has a small amount of calculation.

[0044] Optionally, in this embodiment, the setting process of the above first weight value may be:

[0045] A. Obtain the first distance between the first test area a and the second test area b in each test group 10. Specifically, as Figure 2 shown in Figure 2It includes four first test areas, which are respectively marked as a1, a2, a3 and a4; and the first distance between the first test area marked as a1 and the second test area marked as b1 is d1, the first distance between the first test area marked as a2 and the second test area marked as b2 is d2, the first distance between the first test area marked as a3 and the second test area marked as b3 is d3, and the first distance between the first test area marked as a4 and the second test area marked as b4 is d4.

[0046] B. Obtain the first sum value of all the first distances, and obtain the first ratio of the first distance of each test group 10 to the first sum value. Specifically, as Figure 2 shown, the first ratio of the test group 10 corresponding to the first test area marked as a1 is d1 / (d1 + d2 + d3 + d4), the first ratio of the test group 10 corresponding to the first test area marked as a2 is d2 / (d1 + d2 + d3 + d4), the first ratio of the test group 10 corresponding to the first test area marked as a3 is d3 / (d1 + d2 + d3 + d4), and the first ratio of the test group 10 corresponding to the first test area marked as a4 is d4 / (d1 + d2 + d3 + d4).

[0047] C. Select one from multiple first ratios as the first weight value according to the magnitude of the first distance of each test group 10; among them, the larger the first distance, the smaller the selected first weight value. Specifically, as Figure 2 shown, the ratios corresponding to the above four test groups 10 are arranged from large to small in turn as: d4 / (d1 + d2 + d3 + d4), d3 / (d1 + d2 + d3 + d4), d2 / (d1 + d2 + d3 + d4), d1 / (d1 + d2 + d3 + d4); then at this time, the first weight value of the test group 10 corresponding to the first test area marked as a1 is d4 / (d1 + d2 + d3 + d4), the first weight value of the test group 10 corresponding to the first test area marked as a2 is d3 / (d1 + d2 + d3 + d4), the first weight value of the test group 10 corresponding to the first test area marked as a3 is d2 / (d1 + d2 + d3 + d4), and the first weight value of the test group 10 corresponding to the first test area marked as a4 is d1 / (d1 + d2 + d3 + d4).

[0048] The above method can effectively associate the first distance between the first test area and the second test area within the same test group 10 with the first weight value, and the calculation amount of the process of setting the first weight value according to the first distance is small.

[0049] Of course, in other embodiments, the process of setting the first weight value may also be other; for example, when the shapes and areas of multiple first test regions a are the same and they are arranged side by side along the direction perpendicular to the first central axis L1 (i.e., along the second central axis L2 direction), as long as the difference between the first weight values corresponding to adjacent first test regions a or adjacent second test regions b is the same, there is not much limitation on the specific value of the first weight value corresponding to each specific test group 10. For example, taking Figure 2 as an example, the first weight values of the four test groups 10 corresponding to the first test regions marked as a1, a2, a3, and a4 can be 40%, 30%, 20%, and 10% respectively (a total of 100%); or, the first weight values of the four test groups 10 corresponding to the first test regions marked as a1, a2, a3, and a4 can be 31%, 27%, 23%, and 19% respectively (a total of 100%), etc. The process of setting the above first weight value is relatively simple.

[0050] Of course, in other embodiments, the implementation process of obtaining the second afterimage parameter by using the first afterimage parameters of multiple test groups in the above step S105 may also be other; for example, taking the average value of the first afterimage parameters of multiple test groups as the second afterimage parameter.

[0051] In yet another embodiment, as Figure 4 shown, Figure 4 is a schematic structural diagram of another embodiment of the display panel. When dividing the display panel 1 before the above step S101, the display panel 1 can be divided to obtain at least two groups of first selected regions A and second selected regions B. At this time, the first selected region A and the second selected region B in the same group are symmetrically arranged about the first central axis L1; there may be a gap between adjacent first selected regions A (as Figure 4 shown), or adjacent first selected regions A may also be in direct contact. Optionally, the shapes and areas of all first selected regions A are the same, and all first selected regions A can be arranged side by side along the direction perpendicular to the first central axis L1 (i.e., the direction of the second central axis L2); and / or, the way of subdividing adjacent first selected regions A into multiple first test regions ( Figure 4 not shown) can be the same. The above design method can reduce the difficulty of dividing the display panel 1. Another optionally, each first selected region A can be symmetric about the second central axis L2. This design method can make the first selected region A as close as possible to the central position of the display panel 1, so that the subsequent afterimage test results can match the visual results as much as possible.

[0052] Further, on this basis, after the step of obtaining the second afterimage parameter by using the first afterimage parameters of multiple test groups and the corresponding first weight values in the above step S105, the following steps may further be included: obtaining the third afterimage parameter of the display panel 1 by using the multiple second afterimage parameters and the corresponding second weight values; wherein, the greater the second distance between the first selected area A and the second selected area B in the same group, the smaller the second weight value. It is expressed by the formula as follows:

[0053] Wherein, IS3 is the third afterimage parameter, with the unit of JND; IS2(i) is the second afterimage parameter related to the i-th first selected area A; λ2(i) is the second weight value related to the i-th first selected area A, and m is the total number of the first selected areas A. The above method for calculating the third afterimage parameter is relatively simple and has a small amount of calculation.

[0054] Optionally, in this embodiment, the sum of all the second weight values may also be 1; and the setting process of the second weight value may be similar to that of the first weight value, which will not be elaborated herein. For example, obtaining the second distance between each group of the first selected area A and the second selected area B; obtaining the second sum value of all the second distances, and obtaining the second ratio of the second distance between each group of the first selected area A and the second selected area B to the second sum value; selecting one from multiple second ratios as the second weight value according to the magnitude of the second distance between each group of the first selected area A and the second selected area B; wherein, the greater the second distance, the smaller the selected second weight value.

[0055] In addition, when performing step S103, after making the display panel 1 display a medium gray-level picture, start timing, continuously collect the second luminance data of the first test area a and the second test area b at multiple moments, and then the second afterimage parameter at each moment can be obtained through steps S104 - S105; further, a corresponding afterimage curve can be drawn according to multiple moments and the second afterimage parameter at each moment; at this time, the R & D personnel can judge the afterimage level of the display panel according to the afterimage curve.

[0056] The following further illustrates the afterimage test method provided by the present application with a specific application scenario. Specifically, the duration of step S102 is preset to be 1 min, and the division method of the display panel 1 is as Figure 2 shown in

[0057] Please refer to Figure 5a and Figure 5b , Figure 5a which are the schematic diagrams of the luminance data of the first selected area and multiple first test areas collected at different acquisition times after entering step S103, Figure 5bSchematic diagram of the brightness data of the second selected area and multiple second test areas collected at different acquisition times after entering step S103. From Figure 5a and Figure 5b it can be seen that the brightness of multiple first test areas within the first selected area A is not the same, and the brightness of multiple second test areas within the second selected area B is not the same, showing a certain degree of difference. In some cases, when the brightness difference of the areas near the first central axis L1 in the first selected area A and the second selected area B is large, even if the average brightness difference between the first selected area A and the second selected area B is small, the user will still see an obvious dividing line at the position of the first central axis L1. That is, at this time, the afterimage parameters calculated directly according to the average brightness of the first selected area A and the average brightness of the second selected area B cannot match the visual result.

[0058] Furthermore, as shown in Table 1 below, Table 1 is a comparison table of afterimage test results obtained by using different afterimage test methods.

[0059] Table 1: Comparison table of afterimage test results obtained by using different afterimage test methods

[0060]

[0061] Among them, the implementation steps of the existing method in Table 1 are as follows: make the display panel display a medium gray-level image, and obtain the first average brightness data of the first selected area and the second selected area in the display panel; make the display panel on one side of the first central axis display a black image, and make the display panel on the other side of the first central axis display a white image; make the display panel display a medium gray-level image, and obtain the second average brightness data of the first selected area and the second selected area; obtain the first afterimage parameter according to the first average brightness data and the second average brightness data, and this first afterimage parameter is the second afterimage parameter in this application; the test method adopted in this application in Table 1 can refer to the above steps S101 - step S105, which will not be elaborated here.

[0062] Among them, IS2 in Table 1 refers to the second afterimage parameter tested at the 0th second and the 10th second after displaying a medium gray-level image after black and white block aging using the existing method or the method provided in this application; IS1(1), IS1(2), IS1(3), IS1(4) respectively refer to Figure 2 the first afterimage parameters tested by the first test group formed by a1 and b1, the second test group formed by a2 and b2, the third test group formed by a3 and b3, and the fourth test group formed by a4 and b4 in

[0063] As can be seen from Table 1 above, at the same moment, the first afterimage parameter IS1(1) of the first test group closest to the first central axis L1 is not the same as the second afterimage parameter IS2 obtained by the existing method, and there is a difference between the two. And because the visual effect of the human eye is highly correlated with the first test group closest to the first central axis, it can be considered that the matching degree between the afterimage result obtained by the existing method and the visual effect of the human eye is not very good.

[0064] In addition, as can be seen from Table 1 above, the values of IS1(2), IS1(3), and IS1(4) also have differences compared with IS2 obtained by the existing method, indicating that the regional brightness differences between the subdivided a2 and b2, a3 and b3, and a4 and b4 are different from the overall average brightness difference between regions A and B. And since the regions farther away from the first central axis L1 (such as a3 and b3) have less impact on the visual effect of the human eye, the method of adjusting the first weight value of the first afterimage parameter of each test region according to the distance in this application will obtain a second afterimage parameter that is more reasonable, more accurate, and has a higher matching degree with the visual result of the human eye.

[0065] In addition, the industry generally takes 1.5 JND as the afterimage parameter value that the human eye cannot distinguish; in this embodiment, the second afterimage parameter is obtained in real time by the existing method, and it is found that the time required for it to reach <1.5 JND is 14.9 s. After obtaining the curve graphs of the first afterimage parameter and time corresponding to the first test group, the second test group, the third test group, and the fourth test group by using the method provided in this application, it is found that the time required for the first test group to reach <1.5 JND is 15.8 s, the time required for the second test group to reach <1.5 JND is 14.9 s, the time required for the third test group to reach <1.5 JND is 12.1 s, the time required for the fourth test group to reach <1.5 JND is 9.4 s, and the time required for the first selected region to reach <1.5 JND is 13.5 s. That is, the time required for different test regions to reach 1.5 JND that the human eye cannot distinguish is different, and the matching degree between the method provided in this application and the visual effect is higher.

[0066] Based on the above data analysis, when Figure 2 the brightness uniformity within regions A and B is poor, the difference between the second afterimage parameter obtained by the existing method and the second afterimage parameter obtained by the method provided in this application will be further amplified, ultimately resulting in the complete mismatch between the afterimage result of the existing method and the visual result, thus rendering the evaluation invalid; the method provided in this application can ensure the brightness uniformity of each small region through regional subdivision, accurately quantify the impact of brightness differences on the afterimage result by setting the contribution degree of each small region, and ensure the matching of afterimage quantization with the actual visual result.

[0067] Please refer to Figure 6 ,Figure 6 This is a schematic structural diagram of an embodiment of the afterimage test device for the display panel of the present application. The afterimage test device specifically includes: a memory 30 and a processor 32 that are coupled to each other. The memory 30 stores program instructions, and the processor 32 is configured to execute the program instructions to implement the steps in any of the above afterimage test methods. Specifically, the afterimage test device includes, but is not limited to: desktop computers, laptop computers, tablet computers, servers, etc., which are not limited herein. In addition, the processor 32 may also be referred to as a CPU (Central Processing Unit). The processor 32 may be an integrated circuit chip with signal processing capabilities. The processor 32 may also be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. Additionally, the processor 32 may be implemented jointly by integrated circuit chips.

[0068] Please refer to Figure 7 , Figure 7 This is a schematic structural diagram of an embodiment of the storage device of the present application. The storage device 50 stores program instructions 52 that can be run by the processor. The program instructions 52 are used to implement the steps in any of the above afterimage test methods. Optionally, the storage device 50 includes: various media such as USB flash drives, external hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0069] The above are only embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A method for testing image retention of a display panel, characterized in that, Including: Making the display panel display a medium gray-scale image, and obtaining first luminance data of a plurality of first test areas and a plurality of second test areas in the display panel; wherein, the display panel is provided with a first selected area and a second selected area, a plurality of the first test areas are arranged in the first selected area, a plurality of the second test areas are arranged in the second selected area, and one first test area and one second test area form a test group, and the first test area and the second test area in the same test group are symmetrically arranged about a first central axis of the display panel; Making the display panel on one side of the first central axis display a black image, and making the display panel on the other side of the first central axis display a white image; Making the display panel display the medium gray-scale image, and obtaining second luminance data of the plurality of first test areas and the plurality of second test areas; Obtaining a first afterimage parameter according to the first luminance data and the second luminance data of the first test area and the second test area in the same test group; Obtaining a second afterimage parameter by using the first afterimage parameters of the plurality of test groups; The step of obtaining the second afterimage parameter by using the first afterimage parameters of the plurality of test groups includes: Obtaining the second afterimage parameter by using the first afterimage parameters of the plurality of test groups and corresponding first weight values; wherein, the larger the first distance between the first test area and the second test area in the same test group, the smaller the first weight value; The step of obtaining the second afterimage parameter by using the first afterimage parameters of the plurality of test groups and corresponding first weight values includes: Obtaining a first product between the first afterimage parameter of each test group and the corresponding first weight value; wherein, the sum of all the first weight values is one; Taking the sum of all the first products as the second afterimage parameter.

2. The afterimage test method according to claim 1, characterized in that Before the step of obtaining the second afterimage parameter by using the first afterimage parameters of the plurality of test groups and corresponding first weight values, it includes: Obtaining the first distance between the first test area and the second test area in each test group; Obtaining a first sum value of all the first distances, and obtaining a first ratio of the first distance of each test group to the first sum value; Selecting one from the plurality of first ratios as the first weight value according to the magnitude of the first distance of each test group; wherein, the larger the first distance, the smaller the selected first weight value.

3. The afterimage test method according to claim 1, characterized in that Before the step of making the display panel display a medium gray-scale image and obtaining the first luminance data of a plurality of first test areas and a plurality of second test areas in the display panel, it includes: Dividing the display panel to obtain at least one group of the first selected area and the second selected area; wherein, the first selected area and the second selected area in the same group are symmetrically arranged about the first central axis. Divide the first selected area to obtain a plurality of the first test areas, and divide the second selected area to obtain a plurality of the second test areas; wherein, the plurality of the first test areas and the plurality of the second test areas are arranged side by side in a direction perpendicular to the first central axis.

4. The afterimage test method according to claim 3, wherein All the first test areas and the second test areas have the same shape and area, and the difference between the first weight values corresponding to adjacent first test areas or adjacent second test areas is the same.

5. The afterimage test method according to claim 4, wherein The display panel includes a second central axis perpendicular to the first central axis, each of the first test areas is symmetric about the second central axis, and each of the second test areas is symmetric about the second central axis.

6. The afterimage test method according to claim 3, wherein The step of dividing the display panel to obtain at least one set of the first selected area and the second selected area includes: dividing the display panel to obtain at least two sets of the first selected area and the second selected area; After the step of obtaining the second afterimage parameter by using the first afterimage parameters of the plurality of test groups and the corresponding first weight values, the method further includes: obtaining the third afterimage parameter of the display panel by using the plurality of second afterimage parameters and the corresponding second weight values; wherein, the greater the second distance between the first selected area and the second selected area in the same group, the smaller the second weight value.

7. The afterimage test method according to claim 6, wherein Before the step of obtaining the third afterimage parameter of the display panel by using the plurality of second afterimage parameters and the corresponding second weight values, it includes: Obtain the second distance between the first selected area and the second selected area in each group; Obtain the second sum value of all the second distances, and obtain the second ratio of the second distance between the first selected area and the second selected area in each group to the second sum value; Select one from the plurality of second ratios as the second weight value according to the magnitude of the second distance between the first selected area and the second selected area in each group; wherein, the greater the second distance, the smaller the selected second weight value.

8. The afterimage test method according to claim 1, characterized in that, The step of obtaining the first afterimage parameter according to the first brightness data and the second brightness data of the first test area and the second test area in the same test group includes: Obtain the first sum value and the first difference value between the first brightness data of the first test area and the first brightness data of the second test area in the same test group, and obtain the second sum value and the second difference value between the second brightness data of the first test area and the second brightness data of the second test area in the same test group; Obtain the first ratio of the first difference value to the first sum value, and obtain the second ratio of the second difference value to the second sum value; Take the absolute value of the difference between the second ratio and the first ratio as the first afterimage parameter.

9. A residual image testing device for a display panel, characterized in that, It includes a mutually coupled memory and a processor, and program instructions are stored in the memory, and the processor is configured to execute the program instructions to implement the afterimage test method according to any one of claims 1 to 8.

10. A storage device, characterized in that, There are program instructions stored that can be run by a processor, and the program instructions are used to implement the afterimage test method according to any one of claims 1 to 8.

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