Method, device, test equipment and program product for testing residual image of display

Abstract

The application is suitable for the technical field of display screens, and provides a residual image testing method, device, testing equipment and program product of a display screen. The residual image testing method of the display screen comprises: controlling a to-be-tested display screen to display a first display image, and collecting a first screen body image of the to-be-tested display screen; controlling the to-be-tested display screen to switch to display a second display image; controlling the to-be-tested display screen to switch to display the first display image, and collecting a second screen body image of the to-be-tested display screen; and determining a residual image testing result of the to-be-tested display screen based on the first screen body image and the second screen body image. The embodiments of the application can simulate the actual display scene of the display screen during residual image testing, and improve the reliability of the residual image testing result.

Description

Technical Field

[0001] This application belongs to the field of display screen technology, and in particular relates to a method, apparatus, testing equipment and program product for testing image retention of a display screen. Background Technology

[0002] Image retention, or ghosting, refers to the phenomenon where an image remains after a period of stillness when switching to another image. The difference between image retention and stillness is that image retention gradually disappears over time, while stillness persists. Image retention is particularly prominent in Organic Light-Emitting Diode (OLED) displays. Short-term image retention has become an important indicator for evaluating OLED displays. However, current image retention testing methods mostly use black-and-white images, which are detached from the actual display scenarios, leading to unreliable test results. Summary of the Invention

[0003] This application provides a method, apparatus, testing equipment, and program product for testing image retention on a display screen. It can simulate the actual display scenario of the display screen during image retention testing, thereby improving the reliability of image retention test results.

[0004] The first aspect of this application provides a method for testing the afterimage of a display screen, comprising: controlling the display screen under test to display a first display image and acquiring a first screen image of the display screen under test; the first display image includes a plurality of first partitions, different first partitions of the plurality of first partitions corresponding to different display colors, wherein at least one first partition corresponds to a color display; controlling the display screen under test to switch to displaying a second display image; the second display image includes a plurality of second partitions corresponding one-to-one with the plurality of first partitions, each second partition being a checkerboard pattern formed by a first color associated with the display color of the corresponding first partition and a reference color, wherein the reference color is different from each of the first colors; controlling the display screen under test to switch to displaying the first display image and acquiring a second screen image of the display screen under test; and determining the afterimage test result of the display screen under test based on the first screen image and the second screen image.

[0005] In some embodiments of the first aspect, determining the afterimage test result of the display screen under test based on the first screen image and the second screen image includes: determining a pair of matching points located at the same position in the first screen image and the second screen image; determining a brightness difference value between the matching point pairs based on the optical information of the matching point pairs and the optical information of the neighboring pixels of the matching point pairs; and determining the afterimage test result based on the brightness difference value between the matching point pairs.

[0006] In some embodiments of the first aspect, determining the matching point pair located at the same position in the first screen image and the second screen image includes: extracting image regions in the second screen image that correspond one-to-one with the plurality of first partitions; controlling a sliding window to move in each of the image regions and calculating an optical difference value of the sliding window at each position, the optical difference value characterizing the optical difference between pixels used to display the display color within the sliding window; for each of the image regions, selecting a target pixel in the sliding window when the optical difference value reaches its maximum value, and forming the matching point pair with the target pixel and the pixel at the same position in the first screen image.

[0007] In some embodiments of the first aspect, determining the afterimage test result based on the brightness difference value between the matching point pairs includes: determining a target brightness difference value based on the brightness difference value between the matching point pairs determined from each of the image regions; and determining the afterimage test result based on the target brightness difference value.

[0008] In some embodiments of the first aspect, before controlling the display screen under test to display the first display image, the method further includes: determining grayscale information of the display screen under test; and acquiring the first display image based on the grayscale information.

[0009] In some embodiments of the first aspect, determining the grayscale information of the display screen under test includes: acquiring historical display information, the historical display information including afterimage information when the display screen switches between display sample images at different grayscale levels, the sample images including pure color images of each display color; determining the display grayscale corresponding to each display color based on the historical display information; and obtaining the grayscale information based on the display grayscale corresponding to each display color.

[0010] In some embodiments of the first aspect, after controlling the display screen under test to switch to displaying the second display image, the method further includes: controlling the display screen to continue displaying the second display image until the display duration exceeds a duration threshold.

[0011] A second aspect of this application provides a display screen afterimage testing device, comprising: a first display control unit, configured to control the display screen under test to display a first display image and acquire a first screen image of the display screen under test; the first display image includes a plurality of first partitions, different first partitions of the plurality of first partitions corresponding to different display colors, wherein at least one first partition corresponds to a color display color; a second display control unit, configured to control the display screen under test to switch to displaying a second display image; the second display image includes a plurality of second partitions corresponding one-to-one with the plurality of first partitions, each second partition being a checkerboard pattern formed by a first color associated with the display color of the corresponding first partition and a reference color, wherein the reference color is different from each of the first colors; a third display control unit, configured to control the display screen under test to switch to displaying the first display image and acquire a second screen image of the display screen under test; and an afterimage detection unit, configured to determine the afterimage test result of the display screen under test based on the first screen image and the second screen image.

[0012] A third aspect of this application provides a testing device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the above-mentioned display screen ghosting test steps.

[0013] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described display screen ghosting test method.

[0014] The fifth aspect of this application provides a computer program product that, when the computer program is run, causes the above-mentioned display screen ghosting test method to be executed.

[0015] In the embodiments of this application, by acquiring a first screen image of the display screen under test when displaying a first display image, and a second screen image when switching to display a second display image and then switching back to display the first display image, the image retention test result of the display screen under test is determined based on the first screen image and the second screen image. Since there are color partitions in the first display image and color checkerboards in the checkerboard of the second display image, the display scene of the display screen actually displaying a color image can be simulated during the image retention test, which helps to improve the reliability of the image retention test result. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram illustrating the implementation process of the display screen ghosting test method provided in the embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the first display image provided in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the structure of the second display image provided in the embodiments of this application;

[0020] Figure 4 This is a schematic diagram illustrating the specific implementation process for determining the afterimage test results provided in the embodiments of this application;

[0021] Figure 5 This is a schematic diagram illustrating the specific implementation process of determining matching point pairs provided in the embodiments of this application;

[0022] Figure 6 This is a schematic diagram of the neighboring pixels provided in the embodiments of this application;

[0023] Figure 7 This is a schematic diagram of the structure of the display screen retention testing device provided in the embodiments of this application;

[0024] Figure 8 This is a schematic diagram of the structure of the test equipment provided in the embodiments of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are protected by this application.

[0026] Image retention, or ghosting, refers to the phenomenon where an image remains after a period of stillness when switching to another image. The difference between image retention and ghosting is that image retention gradually disappears over time, while ghosting does not. Image retention is particularly prominent in Organic Light-Emitting Diode (OLED) displays. Short-term image retention has become an important indicator for evaluating OLED displays. However, current image retention testing methods mostly use black-and-white images. However, real-world display scenarios often require displaying color images, making this method incompatible with actual display scenarios. This can lead to displays that pass testing exhibiting severe image retention in real-world situations, resulting in unreliable test results.

[0027] Based on this, this application proposes a method for testing image retention of a display screen, which can simulate the actual display scenario of the display screen during image retention testing, thereby improving the reliability of image retention test results.

[0028] To illustrate the technical solution of this application, specific embodiments are described below.

[0029] Figure 1 This illustration shows a schematic flowchart of a display screen retention testing method according to an embodiment of this application. This method can be applied to a testing device. The testing device can be a computer, tablet computer, dedicated testing fixture, or other smart device; this application does not impose any limitations on this.

[0030] Specifically, the above-mentioned method for testing the image retention of the display screen may include the following steps S101 to S104.

[0031] Step S101: Control the display screen under test to display the first display image, and acquire the first screen image of the display screen under test.

[0032] The displayed image is the image that needs to be displayed on the screen. The first displayed image is one type of displayed image and may include multiple first partitions. Specifically, the first displayed image may be divided into first partitions by equal division or other division methods.

[0033] For example, Figure 2 This illustrates the case where the first displayed image is equally divided into four first partitions. These four first partitions are... Figure 2 The first display image shown is arranged in a four-grid pattern. In practical applications, multiple first partitions can also be divided along the length or width direction, and this application does not impose any restrictions on this.

[0034] In the embodiments of this application, different first partitions among the plurality of first partitions correspond to different display colors. Specifically, each first partition may be composed of a solid color block of the corresponding display color. Furthermore, at least one first partition corresponds to a color display, where color display refers to a color other than black, white, or gray.

[0035] For example, in Figure 2 In the image, the four first partitions correspond to the display colors white (W), red (R), green (G), and blue (B), respectively.

[0036] In this way, different first partitions correspond to different display colors and at least one partition displays color, which can simulate the situation of displaying colorful images in actual display scenarios.

[0037] It should be noted that this application does not limit the control method of the display screen under test. For example, the display image to be displayed and the display command to be displayed can be sent to the display screen under test through the control device of the display screen under test, or the display image to be displayed can be pre-stored in the memory of the display screen under test.

[0038] When the display screen under test displays the first display image, a first screen image of the display screen under test can be acquired. This first screen image shows the display state of the display screen under test when no display switching occurs. This first screen image can be obtained by taking pictures of the display screen under test using a charge-coupled device (CCD) camera, a complementary metal-oxide-semiconductor (CMOS) camera, or other types of cameras. This application does not limit the scope of this application.

[0039] Step S102: Control the display screen under test to switch to displaying the second display image.

[0040] The second display image is different from the first display image. Specifically, the second display image includes multiple second partitions that correspond one-to-one with the multiple first partitions. This one-to-one correspondence means that the second display image uses the same partitioning method as the first display image to divide the multiple second partitions, and each second partition corresponds to a first partition at the same position in the first display image.

[0041] In the embodiments of this application, each second partition is a checkerboard pattern formed by a first color and a base color associated with the display color of the corresponding first partition. The base color is different from each of the first colors and can refer to black. The first color within each second partition must correspond to the display color of the corresponding first partition.

[0042] For example, Figure 3 It shows the relationship with Figure 2The first display image is used in conjunction with the second display image, and the first colors of the four second partitions are white (W), red (R), green (G), and blue (B), respectively, with black as the base color. That is to say, Figure 3 The four second sections in the middle display black and white checkerboard grids, red and black checkerboard grids, green and black checkerboard grids, and blue and black checkerboard grids, respectively.

[0043] It should be noted that the number of first-color squares and base-color squares in the chessboard can be set according to actual needs, for example... Figure 3 Each second section is a 4x4 chessboard.

[0044] Step S103: Control the display screen under test to switch to displaying the first display image, and acquire the second screen image of the display screen under test.

[0045] In the embodiments of this application, after the display screen under test has finished displaying the second display image, it can be controlled to switch back to displaying the first display image. It should be understood that when switching back to display the first display image, due to the difference between the first and second display images, image retention may occur on the display screen under test. To perform image retention analysis, a second screen image of the display screen under test can be acquired when the display screen switches to display the first display image.

[0046] The second screen image can show the display state of the display screen under test after two display switching processes. The first screen image can also be obtained by taking pictures of the display screen under test using a charge-coupled device camera, a complementary metal-oxide-semiconductor camera, or other types of cameras, and this application does not impose any restrictions on this.

[0047] Step S104: Based on the first screen image and the second screen image, determine the afterimage test result of the display screen under test.

[0048] In the embodiments of this application, the first screen image reflects the display state of the screen under test when there is no afterimage, while the second screen image reflects the display state of the screen under test after display switching. By comparing the first screen image and the second screen image, it can be determined whether the display switching process causes obvious afterimages on the screen under test, thereby obtaining the afterimage test result of the screen under test. The afterimage test result reflects the severity of afterimages on the screen under test.

[0049] In the embodiments of this application, by acquiring a first screen image of the display screen under test when displaying a first display image, and a second screen image when switching to display a second display image and then switching back to display the first display image, the image retention test result of the display screen under test is determined based on the first screen image and the second screen image. Since there are color partitions in the first display image and color checkerboards in the checkerboard of the second display image, the display scene of the display screen actually displaying a color image can be simulated during the image retention test, which helps to improve the reliability of the image retention test result.

[0050] In some embodiments of this application, before controlling the display screen under test to display the first display image, the method may further include: determining the grayscale information of the display screen under test, and acquiring the first display image based on the grayscale information.

[0051] Among them, grayscale information can be used to characterize the grayscale when the display screen under test displays the first image. Grayscale refers to the brightness levels from black to white, usually represented by bits, such as 8 bits which is 256 levels. The brightness, saturation and other optical information of the same color are different at different grayscale levels.

[0052] In some embodiments of this application, the grayscale information can be set by the user based on experience, such as 127 levels, 48 ​​levels, etc. In this case, the first display image can be obtained based on the grayscale information. For example, Figure 2 The four first partitions can be grayscale images W127, R127, B127 and G127 respectively, or grayscale images W48, R48, B48 and G48 respectively.

[0053] It should be noted that in the first displayed image, the gray levels can be different between different first zones. For example, Figure 2 The four first partitions in the image can be represented as grayscale images W127, R48, B48, and G48, respectively.

[0054] In some other embodiments of this application, determining the grayscale information of the display screen under test may include: acquiring historical display information, determining the display grayscale corresponding to each display color based on the historical display information, and obtaining grayscale information based on the display grayscale corresponding to each display color.

[0055] The historical display information may include image retention information when the display switches between sample images at different grayscale levels. The sample images include pure color images for each displayed color. Specifically, at each grayscale level, the display screen (which may be the same screen as the screen under test or a different screen) can be controlled to switch between multiple pure color images (such as white, red, blue, and green images), and image retention can be detected using a spectrometer. Image retention information may specifically refer to image retention level, image retention frequency, etc. Based on the historical display information, a corresponding grayscale level can be determined for each displayed color to obtain grayscale information, and a first display image corresponding to the grayscale information can be obtained.

[0056] Specifically, the grayscale level with the highest frequency of image retention can be selected for each display color, or statistical analysis can be performed based on the grayscale level with the highest frequency of image retention for each display color to obtain the grayscale level used by all display colors. This allows the selected grayscale level to be adapted for image retention testing.

[0057] After obtaining the first display image, the display screen under test can be controlled to display the first display image first, and after acquiring the first screen image, the display screen under test can be controlled to switch to display the second display image.

[0058] In some embodiments of this application, after controlling the display screen under test to switch to displaying the second display image, the method may further include: controlling the display screen to continuously display the second display image until the display duration exceeds a duration threshold.

[0059] Different duration thresholds can result in different types of ghosting on the screen under test, such as short-term ghosting and long-term ghosting. Therefore, the duration threshold can be selected according to the test purpose, such as 10 minutes, 3 minutes, 1 minute, etc.

[0060] After the display screen continuously displays the second display image for a duration exceeding a duration threshold, the display screen under test can be controlled to switch to displaying the first display image, and the second screen image of the display screen under test can be acquired. Then, based on the first screen image and the second screen image, the afterimage test result of the display screen under test can be determined.

[0061] In some embodiments of this application, such as Figure 4 As shown, determining the afterimage test result of the display screen under test based on the first screen image and the second screen image may include steps S401 to S403.

[0062] Step S401: Determine matching point pairs located at the same position in the first screen image and the second screen image.

[0063] Specifically, one or more pixels can be selected from the first or second screen image as pixels for analyzing afterimages. Each matching point pair consists of a pixel from the first screen image and a pixel at the same position in the second screen image.

[0064] The method for selecting matching point pairs can be chosen based on the actual situation.

[0065] In some embodiments of this application, matching point pairs can be randomly selected from the first screen image and the second screen image.

[0066] In other embodiments of this application, pixels near the corner point can be selected in each first partition to form matching point pairs. Considering that neighboring pixels are needed to calculate the brightness difference value later, pixels that are closest to the corner point and have neighboring pixels in the four directions of up, down, left, and right can be selected.

[0067] For example Figure 2 In the image, the first partition in the upper left corner selects the pixel in the second row and second column. This selection method makes it relatively easy to find the corresponding pixel and is quite convenient.

[0068] In other embodiments of this application, such as Figure 5 As shown, determining a pair of matching points located at the same position in the first screen image and the second screen image may include steps S501 to S503.

[0069] Step S501: Extract the image regions that correspond one-to-one with the multiple first partitions in the second screen image.

[0070] Here, image processing algorithms such as threshold segmentation and feature extraction can be used to extract image regions corresponding to multiple first partitions from the second screen image; this application does not impose any restrictions on this. Each image region presents the corresponding first partition.

[0071] Step S502: Control the sliding window to move in each image region and calculate the optical difference value of the sliding window at each position.

[0072] The sliding window is a window that can accommodate N*M (where N and M are both greater than 1), and is used to hold multiple pixels. By setting the sliding window at the top left corner of each image region and gradually moving it to the right and down to adjust its position, the optical difference value at each position of the sliding window can be calculated.

[0073] Specifically, the sliding window can be moved to the right step by step according to the preset horizontal sliding step size until it reaches the last column of pixels in the image area. Then, the sliding window is moved down according to the preset vertical sliding step size, and then moved to the left step by step according to the preset horizontal sliding step size. The sliding window is then moved along a bow-shaped path until it reaches the lower right corner of the image area.

[0074] Optical difference values ​​characterize the optical differences between pixels used to display colors within a sliding window. Optical difference can refer to differences in brightness or chromaticity. Optical difference values ​​can be represented by statistical values ​​such as variance and covariance. For example, when a 3x3 sliding window is located in the upper left corner of the first partition, the optical difference value is the optical difference between the nine pixels from the first row, first column to the third row, third column.

[0075] Step S503: For each image region, select the target pixel in the sliding window where the optical difference value reaches its maximum value, and form a matching point pair with the target pixel and the pixel at the same position in the first screen image.

[0076] Understandably, since the first partition displays a pure color, if ghosting occurs, the ghosted portion will differ from the original displayed color. The greater the optical difference value between pixels within the sliding window, the more likely the ghosting image is to appear within the sliding window. Selecting a target pixel within the sliding window where the optical difference value is at its maximum makes it easier for the target pixel to hit the ghosting. The target pixel can be the center pixel of the sliding window, the pixel with the highest pixel value, the pixel with the lowest pixel value, or a randomly selected pixel; this application does not impose any restrictions on this. Thus, the target pixel and pixels at the same location in the first screen image can be paired to form a matching point pair.

[0077] Step S402: Based on the optical information of the matching point pair and the optical information of the neighboring pixels of the matching point pair, determine the brightness difference value between the matching point pairs.

[0078] For a matching point pair, the optical information of the matching point pair, as well as the optical information of the neighboring pixels of the matching point pair, can be obtained based on the second screen image. The optical information can refer to the brightness value.

[0079] Based on the optical information of the matching point pairs and the optical information of the neighboring pixels of the matching point pairs, the brightness difference value between the matching point pairs can be determined. This brightness difference value can reflect the severity of image ghosting.

[0080] Specifically, the brightness difference value can be expressed as:

[0081] IS=MAX(IS(i,j-1),IS(i+1,j),IS(i,j+1),IS(i-1,j));

[0082]

[0083]

[0084]

[0085]

[0086] Where IS represents the brightness difference value, MAX() represents selecting the maximum value among IS(i,j-1), IS(i+1,j), IS(i,j+1), and IS(i-1,j), L(t) represents the brightness value in the second screen image, and L(0) represents the brightness value in the first screen image. Figure 6 As shown, (i,j-1) represents the pixel to the left of the target pixel (i,j), (i+1,j) represents the pixel below the target pixel, (i,j+1) represents the pixel to the right of the target pixel, and (i-1,j) represents the pixel above the target pixel.

[0087] Step S403: Determine the afterimage test result based on the brightness difference value between the matching point pairs.

[0088] Specifically, determining the afterimage test result based on the brightness difference value between the matching point pairs can include: determining the target brightness difference value based on the brightness difference value between the matching point pairs determined from each image region; and determining the afterimage test result based on the target brightness difference value.

[0089] In some embodiments of this application, the target brightness difference value may be the maximum value of the brightness difference between matching point pairs determined from each image region.

[0090] In some embodiments of this application, the difference value can be obtained by fusing the brightness difference values ​​between each pair of matching points.

[0091] Specifically, in some implementations, in order to adapt to the actual display scenario of displaying color images, during fusion, the brightness difference value between matching point pairs determined from the image area corresponding to the partition with white display color can be assigned a first weight, and the brightness difference value between matching point pairs determined from the image area corresponding to the partition with color display color (such as red, green and blue) can be assigned a second weight, with the second weight being greater than the first weight.

[0092] In other implementations, the fusion weight can be assigned based on the optical difference value calculated by the sliding window containing each matching point, as described above. The fusion weight is positively correlated with the optical difference value. It is understood that the larger the optical difference value calculated by the sliding window, the greater the likelihood of ghosting within that window. During fusion, the brightness difference value calculated from the target pixel selected from the sliding window and its neighboring pixels is assigned a higher weight, which can amplify the impact of ghosting on the test results.

[0093] After obtaining the target brightness difference value, if the target brightness difference value is greater than the first difference threshold, it can be determined that a ghost image has occurred.

[0094] Furthermore, the difference value range corresponding to each image retention level can be obtained. Based on the range in which the target brightness difference value is located, the image retention level of the display screen under test can be determined to achieve image retention classification of the display screen.

[0095] In some embodiments of this application, the Just Noticeable Difference (JND) can also be calculated based on the target luminance difference value. The Just Noticeable Difference can be expressed as JND = IS. d / 0.004. Where JND represents the minimum perceptible difference, IS d This represents the target brightness difference value. The minimum perceptible difference reflects the smallest difference in brightness, color, or contrast that the human eye can perceive. It is used to quantify the visibility threshold of image retention. If the minimum perceptible difference is greater than the second difference threshold, image retention can be determined.

[0096] In this way, the ghosting test results can be determined by combining the situation of different partitions, making the ghosting test results more accurate.

[0097] In the embodiments of this application, since the first display image contains color partitions and the second display image contains color checkerboard squares corresponding to the color partitions, switching between the first and second screen images makes the testing process more consistent with actual display scenarios. Furthermore, the first and second display images can be selected to display specific grayscale levels, which improves the targeting of the testing process.

[0098] Furthermore, using images of the display screen captured by the camera to perform image retention analysis can reduce errors caused by human subjectivity. Simultaneously, representative matching point pairs can be selected from the screen image for calculation, and the brightness of each target pixel can be compared with its neighboring pixels above, below, left, and right, thus improving the reliability of the test results.

[0099] It should be noted that, for the sake of simplicity, the aforementioned method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders.

[0100] like Figure 7 The diagram shown is a structural schematic of a display screen retention testing device 700 provided in an embodiment of this application. The display screen retention testing device 700 is configured on a testing device.

[0101] Specifically, the display screen ghosting testing device 700 may include:

[0102] The first display control unit 701 is used to control the display screen under test to display a first display image and to acquire the first screen image of the display screen under test; the first display image includes multiple first partitions, and different first partitions in the multiple first partitions correspond to different display colors, wherein at least one first partition corresponds to a color display.

[0103] The second display control unit 702 is used to control the display screen under test to switch to displaying a second display image; the second display image includes a plurality of second partitions that correspond one-to-one with the plurality of first partitions, each second partition being a checkerboard pattern formed by a first color and a reference color associated with the display color of the corresponding first partition, wherein the reference color is different from each of the first colors;

[0104] The third display control unit 703 is used to control the display screen under test to switch to displaying the first display image and to acquire the second screen image of the display screen under test;

[0105] The image retention detection unit 704 is used to determine the image retention test result of the display screen under test based on the first screen image and the second screen image.

[0106] In some embodiments of this application, the image retention detection unit 704 may be specifically used to: determine a pair of matching points located at the same position in the first screen image and the second screen image; determine the brightness difference value between the matching point pairs based on the optical information of the matching point pairs and the optical information of the neighboring pixels of the matching point pairs; and determine the image retention test result based on the brightness difference value between the matching point pairs.

[0107] In some embodiments of this application, the image retention detection unit 704 may be specifically used to: extract image regions corresponding one-to-one with the plurality of first partitions in the second screen image; control the sliding window to move in each of the image regions and calculate the optical difference value of the sliding window at each position, wherein the optical difference value characterizes the optical difference between pixels used to display the display color within the sliding window; for each of the image regions, select a target pixel in the sliding window when the optical difference value reaches its maximum value, and form the matching point pair with the target pixel and the pixel at the same position in the first screen image.

[0108] In some embodiments of this application, the afterimage detection unit 704 may be specifically used to: determine a target brightness difference value based on the brightness difference value between the matching point pairs determined from each of the image regions; and determine the afterimage test result based on the target brightness difference value.

[0109] In some embodiments of this application, the display screen afterimage testing device 700 may further include an image acquisition unit, specifically used for: determining the grayscale information of the display screen under test; and acquiring the first display image based on the grayscale information.

[0110] In some embodiments of this application, the image acquisition unit is specifically used to: acquire historical display information, the historical display information including afterimage information when the display screen switches between display sample images at different gray levels, the sample images including pure color images of each display color; determine the display gray level corresponding to each display color based on the historical display information; and obtain the gray level information based on the display gray level corresponding to each display color.

[0111] In some embodiments of this application, the second display control unit 702 may be specifically used to: control the display screen to continuously display the second display image until the display duration exceeds a duration threshold.

[0112] It should be noted that, for the sake of convenience and brevity, the specific working process of the above-mentioned display screen afterimage testing device 700 can be found in the following reference: Figures 1 to 6 The corresponding process of the method will not be described in detail here.

[0113] like Figure 8 The diagram shown is a schematic of a testing device provided in an embodiment of this application. Specifically, the testing device 8 may include: a processor 80, a memory 81, and a computer program 82 stored in the memory 81 and executable on the processor 80, such as a display screen ghosting test program.

[0114] When the processor 80 executes the computer program 82, it implements the steps in the embodiments of the image retention testing methods for the various displays described above, for example... Figure 1 Steps S101 to S104 are shown. Alternatively, when the processor 80 executes the computer program 82, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 7 The functions of the first display control unit 701, the second display control unit 702, the third display control unit 703, and the afterimage detection unit 704 are shown.

[0115] The computer program can be divided into one or more modules / units, which are stored in the memory 81 and executed by the processor 80 to complete this application. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the test device 8.

[0116] For example, the computer program can be divided into: a first display control unit, a second display control unit, a third display control unit, and a ghosting detection unit. The specific functions of each unit are as follows: The first display control unit is used to control the display screen under test to display a first display image and to acquire a first screen image of the display screen under test; the first display image includes multiple first partitions, different first partitions corresponding to different display colors, wherein at least one first partition corresponds to a color display; the second display control unit is used to control the display screen under test to switch to displaying a second display image; the second display image includes multiple second partitions corresponding one-to-one with the multiple first partitions, each second partition being a checkerboard pattern formed by a first color associated with the display color of the corresponding first partition and a reference color, wherein the reference color is different from each of the first colors; the third display control unit is used to control the display screen under test to switch to displaying the first display image and to acquire a second screen image of the display screen under test; the ghosting detection unit is used to determine the ghosting test result of the display screen under test based on the first screen image and the second screen image.

[0117] In some embodiments of this application, the test device 8 may also include a camera for capturing images of the screen.

[0118] Those skilled in the art will understand that Figure 8 This is merely an example of test device 8 and does not constitute a limitation on test device 8. It may include more or fewer components than shown, or combine certain components, or different components. For example, the test device 8 may also include input / output devices, network access devices, buses, etc.

[0119] The processor 80 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), off-the-shelf programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0120] The memory 81 can be an internal storage unit of the test device 8, such as a hard disk or memory of the test device 8. The memory 81 can also be an external storage device of the test device 8, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the test device 8. Furthermore, the memory 81 can include both internal and external storage units of the test device 8. The memory 81 is used to store the computer program and other programs and data required by the test device 8. The memory 81 can also be used to temporarily store data that has been output or will be output.

[0121] It should be noted that, for the sake of convenience and brevity, the structure of the above-mentioned test device 8 can also be referred to the specific description of the structure in the method embodiment, which will not be repeated here.

[0122] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0123] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0124] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for various specific applications, but such implementations should not be considered beyond the scope of this application.

[0125] In the embodiments provided in this application, it should be understood that the disclosed apparatus / devices and methods can be implemented in other ways. For example, the apparatus / device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0126] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0127] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0128] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0129] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for testing image retention on a display screen, characterized in that, include: Control the display screen under test to display a first display image, and acquire the first screen image of the display screen under test; The first display image includes a plurality of first partitions, and different first partitions in the plurality of first partitions correspond to different display colors, wherein at least one first partition corresponds to a display color of color; The display screen under test is controlled to switch to display a second display image; the second display image includes a plurality of second partitions that correspond one-to-one with the plurality of first partitions, each second partition being a checkerboard pattern formed by a first color and a base color associated with the display color of the corresponding first partition, wherein the base color is different from each of the first colors; Control the display screen under test to switch to displaying the first display image, and acquire the second screen image of the display screen under test; Based on the first screen image and the second screen image, the afterimage test result of the display screen under test is determined.

2. The method for testing image retention on a display screen as described in claim 1, characterized in that, The step of determining the afterimage test result of the display screen under test based on the first screen image and the second screen image includes: In the first screen image and the second screen image, identify matching point pairs located at the same position; Based on the optical information of the matching point pair and the optical information of the neighboring pixels of the matching point pair, the brightness difference value between the matching point pairs is determined. The afterimage test result is determined based on the brightness difference between the matched point pairs.

3. The method for testing image retention on a display screen as described in claim 2, characterized in that, Determining a pair of matching points located at the same position in the first screen image and the second screen image includes: Extract the image regions that correspond one-to-one with the plurality of first partitions in the second screen image; The sliding window is controlled to move in each of the image regions, and an optical difference value is calculated at each position of the sliding window, the optical difference value representing the optical difference between pixels within the sliding window used to display the display color; For each image region, a target pixel is selected in a sliding window when the optical difference value reaches its maximum value, and the target pixel and a pixel at the same position in the first screen image are combined to form the matching point pair.

4. The method for testing image retention on a display screen as described in claim 3, characterized in that, Determining the afterimage test result based on the brightness difference value between the matched point pairs includes: The target brightness difference value is determined based on the brightness difference value between the matching point pairs determined from each of the image regions; The afterimage test result is determined based on the target brightness difference value.

5. The method for testing image retention on a display screen as described in claim 1, characterized in that, Before the control of the display screen under test to display the first display image, the method further includes: Determine the grayscale information of the display screen under test; Based on the grayscale information, the first display image is obtained.

6. The method for testing image retention on a display screen as described in claim 5, characterized in that, Determining the grayscale information of the display screen under test includes: Obtain historical display information, which includes afterimage information when the display screen switches between display sample images at different gray levels, and the sample images include pure color images of each display color; Based on the historical display information, determine the display grayscale corresponding to each display color; The grayscale information is obtained based on the grayscale corresponding to each display color.

7. The method for testing image retention of a display screen as described in any one of claims 1-6, characterized in that, After controlling the display screen under test to switch to displaying the second image, the process also includes: The display screen is controlled to continuously display the second display image until the display duration exceeds the duration threshold.

8. A device for testing image retention on a display screen, characterized in that, include: The first display control unit is used to control the display screen under test to display a first display image and to acquire the first screen image of the display screen under test; The first display image includes a plurality of first partitions, and different first partitions in the plurality of first partitions correspond to different display colors, wherein at least one first partition corresponds to a display color of color; The second display control unit is used to control the display screen under test to switch to displaying a second display image; the second display image includes a plurality of second partitions that correspond one-to-one with the plurality of first partitions, each second partition being a checkerboard pattern formed by a first color and a reference color associated with the display color of the corresponding first partition, wherein the reference color is different from each of the first colors; The third display control unit is used to control the display screen under test to switch to displaying the first display image and to acquire the second screen image of the display screen under test; The image retention detection unit is used to determine the image retention test result of the display screen under test based on the first screen image and the second screen image.

9. A testing device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it performs the step of testing the image retention of the display screen as described in any one of claims 1 to 7.

10. A computer program product, characterized in that, Includes a computer program, which, when run, causes the image retention test method for the display screen as described in any one of claims 1 to 7 to be performed.

Images