Display panel residual image defect detection method, device and equipment and storage medium

Abstract

The invention discloses a display panel residual image defect detection method and device, equipment and a storage medium. The method comprises the following steps: performing optical compensation on a to-be-detected display panel, driving the to-be-detected display panel to display a first image, maintaining the first image for a preset time length, taking an area corresponding to the first sub-image as a first to-be-detected area, the to-be-detected display panel is driven to display a second image, the second image displays a second sub-image in the first to-be-detected area, the second sub-image has a second gray scale, the first gray scale is larger than the second gray scale, and the brightness of the first to-be-detected area is collected at multiple time nodes in the period of displaying the second image; and judging whether the first to-be-detected area has a poor residual image based on the brightness acquired at the plurality of time nodes. Compared with a human eye detection mode, the detection efficiency can be improved, the residual image defect detection accuracy can be improved, and the delivery quality of the display panel can be improved.

Description

Technical Field

[0001] The present invention relates to display technology, and in particular, to a method, device, equipment and storage medium for detecting display panel afterimage defects. Background Art

[0002] The OLED (Organic Light Emitting Diode) display principle is based on the electroluminescence phenomenon of organic materials. An OLED consists of multiple organic layers, usually including two main organic thin film layers: a light-emitting layer and an electron transport layer. These organic layers are sandwiched between two electrodes. When current passes through the organic material, electrons enter the electron transport layer from the negative electrode, and holes enter the hole transport layer from the positive electrode. In the light-emitting layer, electrons and holes combine and release energy, generating photons, thereby achieving light emission and forming an image.

[0003] Before the display panel leaves the factory, it is usually necessary to detect the afterimage of the display panel and detect the panel with afterimage defects. Most of the current detection methods are human eye detection, and quality inspectors observe whether there is an afterimage through the human eye. Due to the differences in visual perception of different people and factors such as eye fatigue, the detection results of different personnel are different, resulting in large fluctuations in the quality of the display panels leaving the factory, and the detection efficiency of the human eye detection method is low. Summary of the Invention

[0004] The present invention provides a method, device, equipment and storage medium for detecting display panel afterimage defects, so as to improve the detection efficiency, improve the accuracy of afterimage defect detection, and improve the quality of the display panel leaving the factory.

[0005] In a first aspect, the present invention provides a method for detecting display panel afterimage defects, including:

[0006] Performing optical compensation on the display panel to be tested, where the optical compensation is to compensate for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single picture is less than a preset difference;

[0007] Driving the display panel to be tested to display a first image and maintaining the first image for a preset duration, where the first image includes a plurality of uniformly distributed first sub-images, and the first sub-image has a first gray scale;

[0008] Taking the area corresponding to the first sub-image as a first area to be detected, and driving the display panel to be tested to display a second image, where the second image displays a second sub-image in the first area to be detected, the second sub-image has a second gray scale, and the first gray scale is greater than the second gray scale;

[0009] Collect the brightness of the first area to be detected at multiple time nodes during the display of the second image;

[0010] Based on the brightness collected at multiple time nodes of the first area to be detected, determine whether there is an afterimage defect in the first area to be detected.

[0011] Optionally, the color depth of the display panel to be measured is 8 bits, the first gray level is greater than or equal to 200, and the second gray level is less than or equal to 50.

[0012] Optionally, the first image is a checkerboard image or a grid image.

[0013] Optionally, determining whether there is an afterimage defect in the first area to be detected based on the brightness collected at multiple time nodes of the first area to be detected includes:

[0014] Based on the brightness collected at multiple time nodes of the first area to be detected, fit a linear function of the brightness change of the first area to be detected over time;

[0015] Determine the slope value of the linear function, and determine whether the slope value is less than a preset slope value;

[0016] If the slope value is less than or equal to the preset slope value, it is determined that there is no afterimage defect in the first area to be detected;

[0017] Otherwise, it is determined that there is an afterimage defect in the first area to be detected.

[0018] Optionally, determining whether there is an afterimage defect in the first area to be detected based on the brightness collected at multiple time nodes of the first area to be detected includes:

[0019] Based on the brightness collected at multiple time nodes of the first area to be detected, fit a linear function of the brightness change of the first area to be detected over time;

[0020] Determine the slope value of the linear function;

[0021] Determine the brightness of the first area to be detected at the critical time node;

[0022] Determine whether the slope value is less than the preset slope value and whether the brightness at the critical time node is less than the preset value;

[0023] If the slope value is less than the preset slope value and the brightness at the critical time node is less than the preset value, it is determined that there is no afterimage defect in the first area to be detected;

[0024] Otherwise, it is determined that there is an afterimage defect in the first area to be detected.

[0025] Optionally, determining whether there is an afterimage defect in the first area to be detected based on the brightnesses collected at multiple time nodes of the first area to be detected includes:

[0026] Determining the brightness of the first area to be detected at a first key time node and the brightness of the second key time node, where the second key time node is after the first key time node;

[0027] Judging whether the brightness of the first key time node is less than a first preset value, and whether the brightness of the second key time node is less than a second preset value, where the second preset value is less than the first preset value;

[0028] If the brightness of the first key time node is less than the first preset value and the brightness of the second key time node is less than the second preset value, it is determined that there is no afterimage defect in the first area to be detected;

[0029] Otherwise, it is determined that there is an afterimage defect in the first area to be detected.

[0030] Optionally, after determining whether there is an afterimage defect in the first area to be detected based on the brightnesses collected at multiple time nodes of the first area to be detected, it further includes:

[0031] Driving the display panel to be tested to display a third image and maintaining the third image for a preset duration, where the third image includes a plurality of third sub-images evenly distributed, the area where the third sub-image is located is a complementary area to the area where the first sub-image is located, and the third sub-image has a first gray level;

[0032] Taking the area corresponding to the third sub-image as a second area to be detected, and driving the display panel to be tested to display a fourth image, where the fourth image displays a fourth sub-image in the second area to be detected, and the fourth sub-image has a second gray level;

[0033] Collecting the brightness of the second area to be detected at multiple time nodes during the display of the fourth image;

[0034] Determining whether there is an afterimage defect in the second area to be detected based on the brightnesses collected at multiple time nodes of the second area to be detected.

[0035] In a second aspect, the present invention further provides a display panel afterimage defect detection device, including:

[0036] An optical compensation module for performing optical compensation on the display panel to be tested, where the optical compensation is to compensate for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single picture is less than a preset difference;

[0037] The first driving display module is used to drive the display panel under test to display a first image and maintain the first image for a preset duration. The first image includes a plurality of first sub-images evenly distributed, and the first sub-images have a first gray level.

[0038] The second driving display module is used to take the area corresponding to the first sub-image as a first area to be detected and drive the display panel under test to display a second image. In the second image, a second sub-image is displayed in the first area to be detected, and the second sub-image has a second gray level, and the first gray level is greater than the second gray level.

[0039] The brightness acquisition module is used to acquire the brightness of the first area to be detected at a plurality of time nodes during the display of the second image.

[0040] The afterimage defect judgment module is used to judge whether there is an afterimage defect in the first area to be detected based on the brightness acquired at a plurality of time nodes of the first area to be detected.

[0041] In a third aspect, the present invention further provides an electronic device, including:

[0042] One or more processors;

[0043] A storage device for storing one or more programs;

[0044] When the one or more programs are executed by the one or more processors, the one or more processors implement the display panel afterimage defect detection method provided in the first aspect of the present invention.

[0045] In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the display panel afterimage defect detection method provided in the first aspect of the present invention is implemented.

[0046] The method for detecting image sticking defects of a display panel provided by the present invention performs optical compensation on the display panel to be tested. The optical compensation compensates for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single picture is less than a preset difference. The display panel to be tested is driven to display a first image and the first image is maintained for a preset duration. Among them, the first image includes a plurality of first sub-images evenly distributed, and the first sub-image has a first gray level. The area corresponding to the first sub-image is used as the first area to be detected, and the display panel to be tested is driven to display a second image. Among them, a second sub-image is displayed in the first area to be detected in the second image, and the second sub-image has a second gray level, and the first gray level is greater than the second gray level. The brightness of the first area to be detected is collected at a plurality of time nodes during the display of the second image, and it is judged whether there is an image sticking defect in the first area to be detected based on the brightness collected at the plurality of time nodes of the first area to be detected. Compared with the method of human eye detection, the present invention can improve the detection efficiency, improve the accuracy of detecting image sticking defects, and improve the ex-factory quality of the display panel.

[0047] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 It is a schematic structural diagram of a driving transistor;

[0050] Figure 2 It is a schematic flow chart of a method for detecting image sticking defects of a display panel provided by the present invention;

[0051] Figure 3 It is a schematic diagram of a first image provided by the present invention;

[0052] Figure 4 It is another schematic diagram of a first image provided by the present invention;

[0053] Figure 5 It is a schematic diagram of the first image switching to the second image provided by the present invention;

[0054] Figure 6 It is a schematic structural diagram of a device for detecting image sticking defects of a display panel provided by the present invention;

[0055] Figure 7 A schematic structural diagram of an electronic device provided by the present invention.

[0056] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and more detailed descriptions will be provided hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0057] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0058] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily need to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0059] Figure 1 A schematic structural diagram of a driving transistor, as Figure 1 shown, the driving transistor generally includes a substrate 101, a gate 102, a gate insulating layer 103, an active layer 104, a source electrode 105 and a drain electrode 106. The gate 102 is formed on the substrate 101, the gate insulating layer 103 covers the gate 102, the active layer 104 is formed on the side of the gate insulating layer 103 away from the gate, and the source electrode 105 and the drain electrode 106 are respectively formed at both ends of the active layer 104. The source electrode 105 is connected to a driving power supply, and the drain electrode 106 is connected to the anode of the sub-pixel. When the driving transistor is turned on, carriers (electrons and holes) move between the source electrode 105 and the drain electrode 106 through the channel of the active layer 104 to form a driving current to drive the sub-pixel to emit light.

[0060] When there are defects at the interface between the gate insulating layer 103 and the active layer 104, these defects will form potential wells to trap carriers. When the voltage of the gate 102 changes, resulting in a decrease or turn-off of the driving current of the driving transistor, due to the existence of the defects, the carrier release speed will become slower. When reflected on the sub-pixel, when the sub-pixel switches from a high-brightness image to a low-brightness image, there will be an afterimage on the sub-pixel, that is, the sub-pixel that should originally display a low brightness needs a relatively long time to drop from a high brightness to a low brightness.

[0061] In order to detect the above-mentioned afterimage defect, the present invention provides a method for detecting afterimage defects of a display panel. The present invention can automatically detect the afterimage defects of the display panel, improve the detection efficiency, and improve the yield rate of the display panel when leaving the factory. This method can be executed by the afterimage defect detection device provided by the present invention. This device can be implemented in a software and / or hardware manner and is usually configured in an electronic device. Figure 2 It is a schematic flowchart of a method for detecting afterimage defects of a display panel provided by the present invention, as Figure 2 shown. The method for detecting afterimage defects of the display panel includes the following steps:

[0062] S101. Perform optical compensation on the display panel to be tested. The optical compensation is to compensate for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single image is less than a preset difference.

[0063] As described above, the sub-pixels of the display panel are driven by driving transistors to emit light. However, due to the limitations of the manufacturing process, the driving transistors at different positions have non-uniformity in electrical parameters such as threshold voltage and electron mobility. This non-uniformity will be converted into current differences and brightness differences of the OLED display panel and be perceived by the human eye, that is, the phenomenon of color or brightness non-uniformity, which usually appears as spots where the local brightness or chromaticity suddenly increases or decreases. This phenomenon of color or brightness non-uniformity will interfere with the subsequent detection of afterimage defects and affect the detection rate. Therefore, it is necessary to perform optical compensation on the display panel to be tested. The optical compensation is to compensate for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single image is less than a preset difference.

[0064] Exemplarily, the process of optical compensation is as follows: Drive the display panel under test to display a test image (usually a solid color image) with a specific gray scale (the gray scale refers to the difference in brightness signal levels shown on the display panel. It divides the brightness change between the brightest and the darkest into several parts for screen brightness control corresponding to the signal input. For example, an 8-bit monitor can display 256 brightness levels, which is called 256 gray scales). Capture the brightness of each sub-pixel through a CCD (Charge Coupled Device) camera, and then model the sub-pixels to obtain the characteristic curve of gray scale-brightness for each sub-pixel. When compensating a certain display image, according to the ideal brightness corresponding to the input gray scale, the compensation gray scale corresponding to making the sub-pixel reach the same brightness can be deduced from the gray scale-brightness characteristic curve of the sub-pixel. Similar operations are performed on all sub-pixels, and a so-called compensation image can be obtained. Using this compensation image to drive the backplane can achieve the desired ideal brightness.

[0065] S102. Drive the display panel under test to display a first image and maintain the first image for a preset duration. The first image includes a plurality of first sub-images evenly distributed, and the first sub-image has a first gray scale.

[0066] After optical compensation, drive the display panel under test to display a first image and maintain the first image for a preset duration. The first image includes a plurality of first sub-images evenly distributed, and the first sub-image has a first gray scale, that is, when driving the display, the driver program sets the first sub-image to be displayed with the first gray scale. Exemplarily, the preset duration can be 5 minutes. Exemplarily, the first sub-image can be formed by combining one or more sub-pixels, and the embodiments of the present invention do not limit this here.

[0067] Exemplarily, Figure 3 is a schematic diagram of a first image provided by the present invention. Figure 4 is another schematic diagram of a first image provided by the present invention. As Figure 3 shown, the first image is a checkerboard image, and the first sub-image is the white square in the checkerboard image. As Figure 4 shown, the first image is a grid image, and the first sub-image is the white grid line in the grid image. It should be noted that the above checkerboard image and grid image are exemplary illustrations of the present invention. In other embodiments of the present invention, the first image can also be an image of other styles, as long as it can achieve the uniform distribution of the first sub-images in the display area of the display panel.

[0068] In the embodiments of the present invention, the first gray scale is a relatively large gray scale. Taking the color depth of the display panel under test as 8 bits as an example, the first gray scale is greater than or equal to 200. Exemplarily, in a specific embodiment of the present invention, the first gray scale is 255.

[0069] S103. Take the area corresponding to the first sub-image as the first area to be detected, and drive the display panel to be tested to display a second image, where the second image displays a second sub-image in the first area to be detected, and the second sub-image has a second gray level, and the first gray level is greater than the second gray level.

[0070] Figure 5 This is a schematic diagram of switching the first image to the second image provided by the present invention. As Figure 5 shown, after the display panel to be tested displays the first image and maintains a preset duration (such as 5 mins), take the area corresponding to the first sub-image as the first area to be detected, and drive the display panel to be tested to display a second image, where the second image displays a second sub-image in the first area to be detected, and the second sub-image has a second gray level, and the first gray level is greater than the second gray level. Exemplarily, the display area of the display panel to be tested can be driven to display a solid color screen as the second image, that is, each sub-pixel displays with the second gray level.

[0071] In the embodiment of the present invention, the second gray level is a relatively small gray level. Taking the color depth of the display panel to be tested as 8 bits as an example, the second gray level is less than or equal to 200. Exemplarily, in a specific embodiment of the present invention, the second gray level is 32.

[0072] S104. Collect the brightness of the first area to be detected at multiple time nodes during the display of the second image.

[0073] In the embodiment of the present invention, the brightness of the first area to be detected is collected by a CCD camera at multiple time nodes during the display of the second image. Exemplarily, the brightness of the first area to be detected is collected at the time nodes of 30 s, 1 min, 3 min, 5 min, 7 min, and 10 min after the display of the second image. It should be noted that the present invention takes the CCD camera as an example of the brightness collection device for illustration. In other embodiments of the present invention, other brightness collection devices can also be used, and the present invention does not limit this here.

[0074] It should be noted that in the embodiment of the present invention, when collecting the brightness of the first area to be detected, the overall brightness of the first area to be detected can be collected, and when judging the afterimage defect later, it is judged whether there is an afterimage defect in the whole of the first area to be detected; or the brightness of each sub-pixel in the first area to be detected can be collected one by one, and when judging the afterimage defect later, it is judged whether there is an afterimage defect in each sub-pixel in the first area to be detected.

[0075] S105. Judge whether there is an afterimage defect in the first area to be detected based on the brightness collected at multiple time nodes of the first area to be detected.

[0076] As described above, the manifestation of the afterimage defect is that when the sub-pixel switches from a high-brightness image to a low-brightness image, the sub-pixel that should originally display a low brightness takes a relatively long time to drop from high brightness to low brightness. Therefore, in the embodiments of the present invention, it is possible to determine whether there is an afterimage defect in the first detection area based on the brightness collected at multiple time nodes after the first sub-image is switched to the second sub-image in the first detection area.

[0077] In some embodiments of the present invention, based on the brightness collected at multiple time nodes of the first detection area, a linear function of the brightness change of the first detection area over time can be fitted, and the slope value of the linear function can be determined. Generally speaking, the brightness of the first detection area decreases over time, that is, the slope value of this linear function is less than zero. The smaller the slope value, the faster the brightness decreases, and the lower the possibility of having an afterimage defect. Therefore, it can be determined whether the slope value is less than a preset slope value. If the slope value is less than or equal to the preset slope value, it is determined that there is no afterimage defect in the first detection area; otherwise, it is determined that there is an afterimage defect in the first detection area.

[0078] In some embodiments of the present invention, in order to improve the determination accuracy, on the basis of the above-mentioned determination of afterimage defects based on the slope value, the brightness at the key time node can be added for comprehensive judgment. Among them, the key time node is the time node at which the brightness is considered to need to drop to a preset value in engineering. Specifically, based on the brightness collected at multiple time nodes of the first detection area, a linear function of the brightness change of the first detection area over time can be fitted, and the slope value of the linear function can be determined. In addition, the brightness of the first detection area at the key time node (for example, the 3 min time node) is determined, and it is judged whether the slope value is less than the preset slope value and whether the brightness at the key time node is less than the preset value. If the slope value is less than the preset slope value and the brightness at the key time node is less than the preset value, it is determined that there is no afterimage defect in the first detection area; otherwise, it is determined that there is an afterimage defect in the first detection area.

[0079] In some embodiments of the present invention, in order to improve the detection efficiency, it is also possible not to fit a linear function and directly determine whether there is an afterimage defect based on the brightness at multiple key time nodes. Specifically, taking two key time nodes as an example, determine the brightness of the first area to be detected at the first key time node and the brightness at the second key time node, where the second key time node is after the first key time node. Exemplarily, the first key time node is the 3-minute time node and the second key time node is the 10-minute time node. Determine whether the brightness at the first key time node is less than a first preset value and whether the brightness at the second key time node is less than a second preset value, where the second preset value is less than the first preset value. If the brightness at the first key time node is less than the first preset value and the brightness at the second key time node is less than the second preset value, it is determined that there is no afterimage defect in the first area to be detected; otherwise, it is determined that there is an afterimage defect in the first area to be detected.

[0080] It should be noted that in the above embodiments, the detection process of one of the first areas to be detected is used as an example to illustrate the present invention. As described in the foregoing embodiments of the present invention, the area corresponding to the first sub-image is used as the first area to be detected, so there are multiple first areas to be detected. For each first area to be detected, determine whether there is an afterimage defect in the first area to be detected based on the brightness collected at multiple time nodes of the first area to be detected.

[0081] The above embodiments detect afterimage defects in multiple evenly distributed first areas to be detected. Although it can generally reflect the afterimage defects of the entire display panel, the areas other than the first areas to be detected are not detected, and these areas may still have afterimage defects. Therefore, it is also possible to detect afterimage defects in these areas.

[0082] In the embodiments of the present invention, after step S105, it further includes:

[0083] 1. Drive the display panel to be tested to display a third image and maintain the third image for a preset duration, where the third image includes multiple evenly distributed third sub-images, the area where the third sub-images are located is a complementary area to the area where the first sub-images are located, and the third sub-images have a first gray level.

[0084] Drive the display panel to be tested to display a third image and maintain the third image for a preset duration, where the third image includes multiple evenly distributed third sub-images, the area where the third sub-images are located is a complementary area to the area of the first sub-images, and the third sub-images have a first gray level, that is, when driving the display, the driver program sets the third sub-images to be displayed at the first gray level. Exemplarily, the preset duration can be 5 minutes. For Figure 3 example, the area where the third sub-images are located is the area where the black squares are located. Exemplarily, it can be Figure 3The colors of the black squares and white squares are reversed. Taking Figure 4 as an example, the area where the third sub-image is located is the area where the black squares are located. Exemplarily, the Figure 4 colors of the black squares and white grids in can be reversed.

[0085] 2. Use the area corresponding to the third sub-image as the second area to be detected, and drive the display panel under test to display a fourth image, where the fourth image displays a fourth sub-image in the second area to be detected, and the fourth sub-image has a second gray level.

[0086] After the display panel under test displays the third image and maintains a preset duration, use the area corresponding to the third sub-image as the second area to be detected, and drive the display panel under test to display a fourth image, where the fourth image displays a fourth sub-image in the second area to be detected, and the fourth sub-image has a second gray level, and the first gray level is greater than the second gray level. Exemplarily, the display area of the display panel under test can be driven to display a solid color screen as the fourth image (second image), that is, each sub-pixel is displayed with the second gray level.

[0087] 3. Collect the brightness of the second area to be detected at multiple time nodes during the display of the fourth image.

[0088] In the embodiments of the present invention, the brightness of the second area to be detected is collected by a CCD camera at multiple time nodes during the display of the fourth image. Exemplarily, the brightness of the second area to be detected is collected at the time nodes of 30s, 1min, 3min, 5min, 7min, and 10min after the display of the fourth image respectively.

[0089] It should be noted that, in the embodiments of the present invention, when collecting the brightness of the second area to be detected, the overall brightness of the second area to be detected can be collected, and when it is necessary to determine the afterimage defect, it is determined whether there is an afterimage defect in the whole second area to be detected; it is also possible to collect the brightness of each sub-pixel of the second area to be detected one by one, and when it is necessary to determine the afterimage defect, it is determined whether there is an afterimage defect in each sub-pixel in the second area to be detected.

[0090] 4. Determine whether there is an afterimage defect in the second area to be detected based on the brightness collected at multiple time nodes of the second area to be detected.

[0091] The manifestation of the afterimage defect is that when the sub-pixel switches from a high-brightness screen to a low-brightness screen, the sub-pixels that should originally display low brightness take a long time to drop from high brightness to low brightness. Therefore, in the embodiments of the present invention, it is possible to determine whether there is an afterimage defect in the second area to be detected based on the brightness collected at multiple time nodes after the third sub-image in the second area to be detected is switched to the fourth sub-image. The specific determination method can refer to the determination process of the first area to be detected in the foregoing embodiments, and this embodiment will not be elaborated here.

[0092] The method for detecting image sticking defects of a display panel provided by the present invention performs optical compensation on the display panel to be tested. The optical compensation compensates for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single picture is less than a preset difference. Drive the display panel to be tested to display a first image and maintain the first image for a preset duration. Among them, the first image includes a plurality of first sub-images evenly distributed, and the first sub-image has a first gray level. The area corresponding to the first sub-image is used as the first area to be detected, and the display panel to be tested is driven to display a second image. Among them, the second image displays a second sub-image in the first area to be detected, and the second sub-image has a second gray level, and the first gray level is greater than the second gray level. Collect the brightness of the first area to be detected at multiple time nodes during the display of the second image, and judge whether there is an image sticking defect in the first area to be detected based on the brightness collected at multiple time nodes of the first area to be detected. Compared with the method of human eye detection, the present invention can improve the detection efficiency, improve the accuracy of detecting image sticking defects, and improve the ex-factory quality of the display panel.

[0093] Figure 6 As shown in the structural schematic diagram of a device for detecting image sticking defects of a display panel provided by the present invention Figure 6 shown, the device for detecting image sticking defects of the display panel includes:

[0094] An optical compensation module 201 for performing optical compensation on the display panel to be tested. The optical compensation compensates for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single picture is less than a preset difference;

[0095] A first driving display module 202 for driving the display panel to be tested to display a first image and maintaining the first image for a preset duration. Among them, the first image includes a plurality of first sub-images evenly distributed, and the first sub-image has a first gray level;

[0096] A second driving display module 203 for using the area corresponding to the first sub-image as the first area to be detected and driving the display panel to be tested to display a second image. Among them, the second image displays a second sub-image in the first area to be detected, and the second sub-image has a second gray level, and the first gray level is greater than the second gray level;

[0097] A brightness acquisition module 204 for acquiring the brightness of the first area to be detected at multiple time nodes during the display of the second image;

[0098] An image sticking defect judgment module 205 for judging whether there is an image sticking defect in the first area to be detected based on the brightness collected at multiple time nodes of the first area to be detected.

[0099] In some embodiments of the present invention, the color depth of the display panel to be measured is 8 bits, the first gray level is greater than or equal to 200, and the second gray level is less than or equal to 50.

[0100] In some embodiments of the present invention, the first image is a checkerboard image or a grid image.

[0101] In some embodiments of the present invention, the afterimage defect judgment module 205 includes:

[0102] A first fitting sub-module, configured to fit a linear function of the luminance change of the first area to be detected over time based on the luminance collected at multiple time nodes of the first area to be detected;

[0103] A first judgment sub-module, configured to determine a slope value of the linear function and judge whether the slope value is less than a preset slope value;

[0104] A first determination sub-module, configured to determine that there is no afterimage defect in the first area to be detected when the slope value is less than or equal to the preset slope value; otherwise, determine that there is an afterimage defect in the first area to be detected.

[0105] In some embodiments of the present invention, the afterimage defect judgment module 205 includes:

[0106] A second fitting sub-module, configured to fit a linear function of the luminance change of the first area to be detected over time based on the luminance collected at multiple time nodes of the first area to be detected;

[0107] A slope determination sub-module, configured to determine a slope value of the linear function;

[0108] A first luminance determination sub-module, configured to determine the luminance of the first area to be detected at a key time node;

[0109] A second judgment sub-module, configured to judge whether the slope value is less than a preset slope value and whether the luminance at the key time node is less than a preset value;

[0110] A second determination sub-module, configured to determine that there is no afterimage defect in the first area to be detected when the slope value is less than the preset slope value and the luminance at the key time node is less than the preset value; otherwise, determine that there is an afterimage defect in the first area to be detected.

[0111] In some embodiments of the present invention, the afterimage defect judgment module 205 includes:

[0112] A second luminance determination sub-module, configured to determine the luminance of the first area to be detected at a first key time node and a second key time node, where the second key time node is after the first key time node;

[0113] A third judgment sub-module, configured to judge whether the brightness at the first key time node is less than a first preset value, and whether the brightness at the second key time node is less than a second preset value, where the second preset value is less than the first preset value;

[0114] A third determination sub-module, configured to determine that there is no image retention defect in the first area to be detected when the brightness at the first key time node is less than the first preset value and the brightness at the second key time node is less than the second preset value; otherwise, determine that there is an image retention defect in the first area to be detected.

[0115] In some embodiments of the present invention, the display panel image retention defect detection device further includes:

[0116] A third driving display module, configured to, after judging whether there is an image retention defect in the first area to be detected based on the brightnesses collected at multiple time nodes of the first area to be detected, drive the display panel to be tested to display a third image and maintain the third image for a preset duration, where the third image includes a plurality of third sub-images evenly distributed, the area where the third sub-image is located is a complementary area to the area where the first sub-image is located, and the third sub-image has a first gray level;

[0117] A fourth driving display module, configured to use the area corresponding to the third sub-image as a second area to be detected, and drive the display panel to be tested to display a fourth image, where the fourth image displays a fourth sub-image in the second area to be detected, and the fourth sub-image has a second gray level;

[0118] A second area brightness acquisition module, configured to acquire the brightness of the second area to be detected at multiple time nodes during the display of the fourth image;

[0119] A second area image retention defect judgment module, configured to judge whether there is an image retention defect in the second area to be detected based on the brightnesses collected at multiple time nodes of the second area to be detected.

[0120] The above display panel image retention defect detection device can execute the display panel image retention defect detection method provided in the foregoing embodiments of the present invention, and has corresponding functional modules and beneficial effects for executing the display panel image retention defect detection method.

[0121] Figure 7Schematic diagram of the structure of an electronic device provided by the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0122] As Figure 7 shown, the electronic device includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as read-only memory (ROM) 12, random access memory (RAM) 13, etc. Among them, the memory stores a computer program executable by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device can also be stored. The processor 11, ROM 12, and RAM 13 are connected to each other through a bus 14. The input / output (I / O) interface 15 is also connected to the bus 14.

[0123] Multiple components in the electronic device are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disc, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0124] The processor 11 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the display panel afterimage defect detection method.

[0125] In some embodiments, the method for detecting display panel image retention defects can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the method for detecting display panel image retention defects described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the method for detecting display panel image retention defects by any other suitable means (e.g., by means of firmware).

[0126] The various embodiments of the systems and techniques described above in this document can be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGA), application specific integrated circuits (ASIC), application specific standard products (ASSP), systems on a chip (SOC), complex programmable logic devices (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special-purpose or general-purpose programmable processor that receives data and instructions from a storage system, at least one input device, and at least one output device, and transmits the data and instructions to the storage system, the at least one input device, and the at least one output device.

[0127] The computer programs for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer programs are executed by the processor, the functions / operations specified in the flowchart and / or block diagram are implemented. The computer programs can be executed entirely on the machine, partially on the machine, as a stand-alone software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0128] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0129] For purposes of providing an interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can also be used to provide for interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, speech input, or tactile input).

[0130] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0131] A computing system may include a client and a server. The client and the server are generally far from each other and usually interact via a communication network. The relationship between the client and the server is created by computer programs running on respective computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system, solving the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0132] An embodiment of the present invention also provides a computer program product, including a computer program which, when executed by a processor, implements the display panel afterimage defect detection method provided in any embodiment of the present application.

[0133] In the process of implementing the computer program product, computer program code for performing the operations of the present invention can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network - including a local area network (LAN) or a wide area network (WAN) - or can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0134] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0135] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for detecting a display panel afterimage defect, characterized in that: include: Performing optical compensation on the display panel to be tested, wherein the optical compensation is to compensate for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single picture is less than a preset difference; Driving the display panel to be tested to display a first image and maintaining the first image for a preset time, wherein the first image includes a plurality of evenly distributed first sub-images, and the first sub-images have a first grayscale; Using the area corresponding to the first sub-image as a first area to be detected, and driving the display panel to be tested to display a second image, wherein the second image displays a second sub-image in the first area to be detected, the second sub-image has a second grayscale, and the first grayscale is greater than the second grayscale; Collecting the brightness of the first area to be detected at multiple time points during displaying the second image; Based on the brightness collected at multiple time nodes of the first area to be detected, it is determined whether the first area to be detected has an afterimage defect.

2. The display panel afterimage detection method according to claim 1, characterized in that: The color depth of the display panel to be tested is 8 bits, the first gray scale is greater than or equal to 200, and the second gray scale is less than or equal to 50.

3. The display panel afterimage detection method according to claim 1, characterized in that: The first image is a checkerboard image or a grid image.

4. The display panel afterimage detection method according to any one of claims 1 to 3, characterized in that: Judging whether the first to-be-detected area has an afterimage defect based on the brightness collected at multiple time nodes of the first to-be-detected area includes: Fitting a linear function of the brightness of the first area to be detected that changes with time based on the brightness collected at multiple time nodes of the first area to be detected; Determining a slope value of the linear function, and judging whether the slope value is less than a preset slope value; If the slope value is less than or equal to a preset slope value, it is determined that there is no residual image defect in the first area to be detected; Otherwise, it is determined that there is an afterimage defect in the first to-be-detected area.

5. The display panel afterimage detection method according to any one of claims 1 to 3, characterized in that: Judging whether the first to-be-detected area has an afterimage defect based on the brightness collected at multiple time nodes of the first to-be-detected area includes: Fitting a linear function of the brightness of the first area to be detected that changes with time based on the brightness collected at multiple time nodes of the first area to be detected; determining a slope value of the linear function; Determining the brightness of the first area to be detected at a key time node; Determine whether the slope value is less than a preset slope value, and whether the brightness of the key time node is less than a preset value; If the slope value is less than a preset slope value, and the brightness of the key time node is less than a preset value, it is determined that there is no residual image defect in the first area to be detected; Otherwise, it is determined that there is an afterimage defect in the first to-be-detected area.

6. The display panel afterimage detection method according to any one of claims 1 to 3, characterized in that: Judging whether the first to-be-detected area has an afterimage defect based on the brightness collected at multiple time nodes of the first to-be-detected area includes: Determine the brightness of the first to-be-detected area at a first key time node and a second key time node, wherein the second key time node is after the first key time node; Determine whether the brightness of the first key time node is less than a first preset value, and whether the brightness of the second key time node is less than a second preset value, wherein the second preset value is less than the first preset value; If the brightness at the first key time node is less than a first preset value, and the brightness at the second key time node is less than a second preset value, it is determined that there is no residual image defect in the first area to be detected; Otherwise, it is determined that there is an afterimage defect in the first to-be-detected area.

7. The display panel afterimage detection method according to any one of claims 1 to 3, characterized in that: After judging whether the first to-be-detected area has an afterimage defect based on the brightness collected at multiple time nodes of the first to-be-detected area, the method further includes: Driving the display panel to be tested to display a third image and maintaining the third image for a preset time, wherein the third image includes a plurality of evenly distributed third sub-images, an area where the third sub-images are located is a complementary area to an area where the first sub-images are located, and the third sub-images have a first grayscale; Using the area corresponding to the third sub-image as the second area to be detected, and driving the display panel to be tested to display a fourth image, wherein the fourth image displays a fourth sub-image in the second area to be detected, and the fourth sub-image has a second grayscale; collecting the brightness of the second area to be detected at multiple time points during displaying the fourth image; Based on the brightness collected at multiple time nodes of the second area to be detected, it is determined whether the second area to be detected has an afterimage defect.

8. A display panel residual image defect detection device, characterized in that: include: An optical compensation module, used for performing optical compensation on the display panel to be tested, wherein the optical compensation is to compensate for the brightness deviation of each sub-pixel of the display panel to ensure that the difference in brightness of each sub-pixel when the display panel displays a single picture is less than a preset difference; A first display driving module, used for driving the display panel to be tested to display a first image and maintaining the first image for a preset time, wherein the first image includes a plurality of evenly distributed first sub-images, and the first sub-images have a first grayscale; a second display driving module, configured to use the area corresponding to the first sub-image as a first area to be detected, and drive the display panel to be detected to display a second image, wherein the second image displays a second sub-image in the first area to be detected, the second sub-image has a second grayscale, and the first grayscale is greater than the second grayscale; A brightness acquisition module, used for acquiring the brightness of the first area to be detected at multiple time points during the display of the second image; The residual image defect judgment module is used to judge whether the first area to be detected has a residual image defect based on the brightness collected at multiple time nodes of the first area to be detected.

9. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the display panel afterimage detection method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the display panel afterimage detection method as described in any one of claims 1 to 7 is implemented.

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