Method for measuring parameters of display panel

Abstract

The invention provides a method for measuring parameters of a display panel, the display panel comprises a substrate and a pixel definition layer arranged on one side of the substrate, the pixel definition layer defines a plurality of pixel openings and comprises side walls facing the pixel openings, the width of orthographic projection of the side walls on the substrate is a first line width of the display panel, and the width of the orthographic projection of the side walls on the substrate is a second line width of the display panel. The method comprises the steps that a display panel is photographed on the side, away from a substrate, of a pixel definition layer, a target image is obtained, the target image comprises a plurality of boundary lines dividing a plurality of color partitions, and the boundary lines comprise a first boundary line surrounding a light-emitting area and a second boundary line close to the first boundary line; obtaining a first coordinate corresponding to a first target point located on the first boundary line and a second coordinate corresponding to a second target point located on the second boundary line and close to the first target point; and calculating the distance between the first coordinate and the second coordinate and taking the distance as a first parameter measurement result of the first line width. According to the method, the parameter measurement result of the measurement index of the display panel can be accurately determined.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to a method for measuring parameters of a display panel. Background Art

[0002] Organic light-emitting diode (OLED) technology has developed rapidly in recent years. Traditionally, pixel patterning is achieved using a fine metal mask (FMM) during display panel production. While FMM technology is mature and boasts extensive mass production experience, it also suffers from limitations such as limited precision, high development costs, and long development cycles. FMM-free technology eliminates the limitations of traditional OLED processes on display size, resolution, and other performance characteristics, offering the advantages of high performance, full-scale scalability, and agile delivery. Patents CN118251982A, CN115666161A, and CN116648095A describe this technology for reference.

[0003] During the display panel manufacturing process, key parameters, such as the line width of the pixel definition layer and the MVP line width (the line width from the mask area to the VPDL), must be precisely measured and controlled to ensure that the final display panel's performance meets design requirements. Currently, two-dimensional dimensions such as line width and spacing are typically measured using CD (critical dimension) measurement equipment. However, due to the inability to clearly identify boundary points, it's difficult to accurately determine the corresponding parameter measurement results.

[0004] Therefore, how to improve the accuracy of parameter measurement of a display panel is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0005] The purpose of this application is to provide a method, apparatus, terminal device, computer-readable storage medium and computer program product for measuring parameters of a display panel, aiming to improve the accuracy of parameter measurement of the display panel.

[0006] In a first aspect, the present application provides a method for measuring parameters of a display panel. The display panel includes a substrate and a pixel definition layer disposed on one side of the substrate, the pixel definition layer defining a plurality of pixel openings and including sidewalls facing the pixel openings, wherein the width of the orthographic projection of the sidewalls on the substrate is a first line width of the display panel, the method comprising: photographing the display panel on a side of the pixel definition layer facing away from the substrate and acquiring a target image, wherein the target image includes a plurality of boundary lines dividing a plurality of color partitions, the plurality of color partitions including light-emitting areas corresponding to the pixel openings, and the plurality of boundary lines including a first boundary line surrounding the light-emitting area and a second boundary line adjacent to the first boundary line; Acquire a first coordinate corresponding to a first target point located on the first boundary line, and a second coordinate corresponding to a second target point located on the second boundary line and close to the first target point; The distance between the first coordinate and the second coordinate is calculated and used as a first parameter measurement result of the first line width.

[0007] In one embodiment, the display panel further includes an isolation structure located on a side of the pixel definition layer facing away from the substrate, the isolation structure enclosing a plurality of isolation openings, the isolation openings communicating with corresponding pixel openings, and at the same location of the connected isolation openings and the same pixel opening, a distance between an edge of an orthographic projection of the pixel definition layer on the substrate and an edge of an orthographic projection of the isolation structure on the substrate is equal to a second line width of the display panel, the plurality of boundary lines further include a third boundary line located on a side of the second boundary line away from the first boundary line, and the method further includes: Acquire third coordinates corresponding to a third target point located on the third boundary line and close to the second target point; The distance between the third coordinate and the first coordinate is calculated and used as a second parameter measurement result of the second line width.

[0008] In one embodiment, the isolation structure includes a first layer and a second layer stacked sequentially in a direction away from the substrate, an orthographic projection of a side of the first layer close to the second layer on the substrate is located within an orthographic projection of the second layer on the substrate, and at the same position of the isolation opening, a distance between an edge of the orthographic projection of a side of the first layer close to the second layer on the substrate and an edge of the orthographic projection of the second layer on the substrate is equal to a third line width of the display panel, the multiple boundary lines further include a fourth boundary line located on a side of the third boundary line away from the first boundary line and a fifth boundary line located on a side of the fourth boundary line away from the first boundary line, and the method further includes: Acquire fourth coordinates corresponding to a fourth target point located on the fifth boundary line and close to the third target point; The distance between the fourth coordinate and the third coordinate is calculated and used as a third parameter measurement result of the third line width.

[0009] In one embodiment, a distance between an edge of an orthographic projection of a side of the first layer close to the second layer on the substrate and an edge of the substrate away from the isolation opening is equal to a fourth line width of the display panel; the plurality of boundary lines further include a sixth boundary line located on a side of the fifth boundary line away from the first boundary line; and the method further includes: Obtaining a fifth coordinate corresponding to a fifth coordinate point located on the sixth boundary line and close to the fourth coordinate point; The distance between the fourth coordinate and the fifth coordinate is calculated and used as a fourth parameter measurement result of the fourth line width.

[0010] In one embodiment, the distance between an edge of the orthographic projection of the second layer on the substrate and an edge of the substrate away from the isolation opening is equal to a fifth line width of the display panel; and the method further comprises: The distance between the third coordinate and the fifth coordinate is calculated and used as a fifth parameter measurement result of the fifth line width.

[0011] In one embodiment, the distance between an edge of the orthographic projection of the pixel definition layer on the substrate and an edge of the substrate away from the isolation opening is equal to a sixth line width of the display panel; the method further comprises: The distance between the first coordinate and the fifth coordinate is calculated and used as a sixth parameter measurement result of the sixth line width.

[0012] In one embodiment, the method further comprises: A difference between the first parameter measurement result of the first line width and the second parameter measurement result of the second line width is calculated and used as a seventh parameter measurement result of the seventh line width.

[0013] In one embodiment, the angle between the sidewall and the side of the pixel definition layer close to the substrate is the first angle of the display panel, and the method further includes: Obtaining a thickness of the pixel definition layer and using the thickness as a seventh parameter measurement result of a seventh line width of the display panel; calculating a first ratio between the seventh parameter measurement result and the first parameter measurement result; An inverse tangent function value of the first ratio is calculated and used as an eighth parameter measurement result of the first angle.

[0014] In one embodiment, the method further comprises: Determining a target measurement indicator; the target measurement indicator is any one of the measurement indicators; the measurement indicators include the first line width, the second line width, the third line width, the fourth line width, the fifth line width, the sixth line width and the first angle; Obtaining a target offset value corresponding to the target measurement indicator; The target parameter measurement result corresponding to the target measurement indicator is calibrated using the target offset value to obtain an updated target parameter measurement result.

[0015] In one embodiment, the method further comprises: Obtaining target standard parameters corresponding to the target measurement indicator; Calculating the difference between the target parameter measurement result of the target measurement indicator and the target standard parameter; If the difference is greater than a preset difference threshold, it is determined that the display panel does not meet a preset standard.

[0016] In one embodiment, acquiring the target image includes: Acquire a target area image containing a target area in the display panel; the target area is an area where a graphic circuit corresponding to a measurement indicator is located; the graphic circuit includes the substrate, the pixel definition layer, and the isolation structure; Marking the area to be measured corresponding to the graphic circuit in the target area image; Perform image processing on the area to be measured to obtain a target image.

[0017] In one embodiment, performing image processing on the area to be measured to obtain a target image includes: For each pixel in the area to be measured, determining the grayscale value corresponding to each basic color channel of the pixel; Determining a grayscale value range corresponding to each of the basic color channels, and determining a target color channel based on each of the grayscale value ranges; The boundary line is determined according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and the color partitions are divided according to the boundary line to obtain a target image.

[0018] In one embodiment, determining the grayscale value range corresponding to each of the basic color channels and determining the target color channel according to each of the grayscale value ranges includes: For each of the basic color channels, determining the grayscale value contrast corresponding to the basic color channel; The basic color channel with the largest grayscale value contrast is determined as the target color channel.

[0019] In one embodiment, if the edge of the graphic circuit is a straight line or a protrusion, determining the boundary line according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and dividing the color partitions according to the boundary line to obtain the target image includes: Determine the grayscale value variation of each target grayscale value in the target color channel in the measurement direction, determine the boundary line according to the area with the largest grayscale value variation, and divide the color partitions according to the boundary line to obtain the target image.

[0020] In one embodiment, determining the grayscale value variation of each target grayscale value in the target color channel in the measurement direction, determining the boundary line according to the area with the largest grayscale value variation, and dividing the color partitions according to the boundary line to obtain the target image includes: Generate a line graph for each target grayscale value in the target color channel along the measurement direction; the horizontal axis of the line graph represents the corresponding pixel position along the measurement direction, and the vertical axis represents the grayscale value; The region with the largest grayscale value variation is determined based on the line graph, the boundary line is determined according to the region with the largest grayscale value variation, and color partitions are divided according to the boundary line to obtain a target image.

[0021] In one embodiment, if the edge of the graphic circuit is a slant line, determining the boundary line according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and dividing the color partitions according to the boundary line to obtain the target image includes: According to the grayscale value distribution of each target grayscale value in the target color channel in the oblique line direction, a boundary line corresponding to the oblique line is determined, and the color partitions are divided according to the boundary line to obtain a target image.

[0022] In a second aspect, the present application further provides a device for measuring parameters of a display panel. The device comprises: an image acquisition module, configured to photograph the display panel on a side of the pixel definition layer facing away from the substrate and acquire a target image, wherein the target image includes a plurality of boundary lines dividing a plurality of color partitions, the plurality of color partitions including light-emitting areas corresponding to the pixel openings, and the plurality of boundary lines including a first boundary line surrounding the light-emitting area and a second boundary line adjacent to the first boundary line; a coordinate acquisition module, configured to acquire a first coordinate corresponding to a first target point located on the first boundary line, and a second coordinate corresponding to a second target point located on the second boundary line and close to the first target point; The parameter measurement result calculation module is configured to calculate the distance between the first coordinate and the second coordinate and use the distance as the first parameter measurement result of the first line width.

[0023] In a third aspect, the present application further provides a terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0024] In a fourth aspect, the present application further provides a computer-readable storage medium storing a computer program, which implements the steps of the above method when executed by a processor.

[0025] In a fifth aspect, the present application further provides a computer program product, wherein the computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0026] An embodiment of the present application provides a method for measuring parameters of a display panel. In this method, the display panel includes a substrate and a pixel definition layer disposed on one side of the substrate. The pixel definition layer defines a plurality of pixel openings and includes sidewalls facing the pixel openings. The width of the orthographic projection of the sidewalls on the substrate is the first line width of the display panel. The display panel is photographed on the side of the pixel definition layer facing away from the substrate to obtain a target image. The target image includes a plurality of boundary lines that divide a plurality of color partitions. The plurality of color partitions include luminous areas corresponding to the pixel openings. The plurality of boundary lines include a first boundary line surrounding the luminous area and a second boundary line adjacent to the first boundary line. This means that the structure of the display panel can be determined based on the color partitions and boundary lines in the target image. Then, a first coordinate corresponding to a first target point located on the first boundary line and a second coordinate corresponding to a second target point located on the second boundary line and adjacent to the first target point are obtained. A first parameter measurement result of the first line width of the display panel is determined based on the distance between the first target point on the first boundary line and the second target point on the second boundary line in the target image. Therefore, this method can accurately determine the parameter measurement results of the measurement indicators of the display panel.

[0027] It can be understood that the apparatus for measuring parameters of a display panel, terminal device, computer-readable storage medium, and computer program product provided in the embodiments of the present application have the same beneficial effects as described above and are not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A schematic diagram of a pixel structure provided in an embodiment of the present application; The reference numerals used in the above drawings are as follows: 1-Anode (ITO / Ag / ITO); 2-Pixel definition layer (SiNx); 3-VSS cathode power line (Mo / Al / Ti); 4-OLED (organic light-emitting material); 5-Cathode OLED (cathode, AgMg LiF); 6-Encapsulation layer (CVD1, SiNx); 7-IJP & CVD2; Figure 2 A schematic structural diagram of a display panel provided in an embodiment of the present application; Figure 3 A flowchart of a method for measuring parameters of a display panel provided in an embodiment of the present application; Figure 4 A diagram showing the correspondence between a boundary line and a MASK structure provided in an embodiment of the present application; Figure 5 A schematic diagram of a process for capturing an image of a target area provided in an embodiment of the present application; Figure 6 A schematic diagram of a bump provided in an embodiment of the present application; Figure 7 A schematic structural diagram of a device for measuring parameters of a display panel provided in an embodiment of the present application; Figure 8 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] Figure 1 This is a schematic diagram of a pixel structure provided by an embodiment of the present application. In this pixel structure, an I-shaped structure is added to replace the FMM for RGB patterning, ensuring that each pixel is correctly aligned and forms the desired color pattern. By precisely controlling the MASK structure, efficient RGB patterning can be achieved without an FMM (metal mask).

[0031] During the display panel manufacturing process, key parameters, such as the line width of the pixel definition layer and the line width from the mask area to the VPDL, must be precisely measured and controlled to ensure that the final display panel's performance meets design requirements. Currently, CD (critical dimension) measurement equipment is commonly used to measure two-dimensional dimensions such as line width and spacing. However, due to the inability to clearly identify boundary points, it is difficult to accurately determine the corresponding parameter measurement results.

[0032] A method for measuring parameters of a display panel provided in an embodiment of the present application can be executed by a processor of a terminal device when running a corresponding computer program.

[0033] Specifically, the terminal device in this embodiment can be a device in an AOI (Automatic Optical Inspection) station that includes image processing software, and the image processing software can be EDA (Electronic Design Automation). The AOI system integrates a high-resolution camera, light source, optical lens, terminal device, and mechanical mobile platform to achieve fast and accurate product inspection.

[0034] Figure 2 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present application. Figure 2 As shown, in this embodiment, the display panel includes a substrate and a pixel definition layer arranged on one side of the substrate, the pixel definition layer defines a plurality of pixel openings and includes side walls facing the pixel openings, and the width of the positive projection of the side walls on the substrate is the first line width of the display panel.

[0035] Specifically, a display panel consists of a substrate and a pixel definition layer (PDL) disposed on one side of the substrate. The substrate is the underlying support structure of the display panel. The PDL, through its structural design, defines multiple pixel openings. Pixel openings are reserved in the PDL for accommodating light-emitting materials (such as the organic light-emitting layer in OLEDs) or controlling the alignment of liquid crystal molecules. These openings are the core light-emitting areas of the pixel area.

[0036] Each pixel opening corresponds to a pixel unit, and a display panel requires multiple pixel units to display an image. The pixel openings are isolated from each other to ensure that each pixel unit operates independently; multiple pixel openings together form a complete display area.

[0037] The sidewall refers to the edge portion of the pixel definition layer facing the pixel opening. The first line width of the display panel in this embodiment is the line width of the pixel definition layer, specifically the width of the positive projection of the sidewall of the pixel definition layer on the substrate. Figure 2As shown, the orthographic projection of the side wall on the substrate corresponds to the line segment EF, and the first line width is the length of the line segment EF.

[0038] Figure 3 This is a flowchart of a method for measuring parameters of a display panel provided in an embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown. The method provided in this embodiment includes the following steps: S100: photographing the display panel on the side of the pixel definition layer facing away from the substrate and acquiring a target image, wherein the target image includes a plurality of boundary lines dividing a plurality of color partitions, the plurality of color partitions include a light-emitting area corresponding to the pixel opening, and the plurality of boundary lines include a first boundary line surrounding the light-emitting area and a second boundary line close to the first boundary line.

[0039] In this embodiment, a high-resolution camera is used to photograph the display panel on the side of the pixel definition layer facing away from the substrate to obtain a target image.

[0040] In the target image, there are multiple color partitions, each of which is divided by a boundary line; different color partitions represent different functional areas or structural features of the display panel, such as the light-emitting area corresponding to the pixel opening.

[0041] Figure 4 A corresponding relationship diagram between a boundary line and a MASK structure provided in an embodiment of the present application; Figure 4 As shown, multiple boundary lines surround the light emitting area, including at least the first boundary line and near the first boundary line and away from the second boundary line of the light emitting area It is understandable that the first boundary line and the second boundary line The distance between them is the width of the orthographic projection of the sidewall on the substrate, ie, the first line width.

[0042] S200: Acquire a first coordinate corresponding to a first target point located on a first boundary line, and a second coordinate corresponding to a second target point located on a second boundary line and close to the first target point.

[0043] Specifically, start from the first boundary line Determine the first target point and obtain the first coordinate corresponding to the first target point. Then, The second target point is determined on the first target point, and the second coordinate corresponding to the second target point is obtained. When determining the second target point, the second boundary line can be The point closest to the first target point is used as the second target point.

[0044] In practical applications, according to actual needs, the first boundary line Select a pixel point as the first target point; determine the pixel coordinates of the pixel point in the target image, and use the pixel coordinates as the first coordinates of the first target point. Then, for the second boundary line , traverse the second boundary line For all pixel points on the image, the distance between each pixel point and the first target point is calculated, the pixel point with the smallest distance is determined as the second target point, and the second coordinate corresponding to the second target point is determined.

[0045] S300: Calculate the distance between the first coordinate and the second coordinate, and use it as a first parameter measurement result of the first line width.

[0046] After the first coordinate and the second coordinate are determined, the distance between the first coordinate and the second coordinate can be determined by calculating the difference between the first coordinate and the second coordinate, and the distance can be used as the first parameter measurement result of the first line width.

[0047] In practical applications, a first calculation formula for the first line width can be pre-set, and after determining the first coordinate and the second coordinate, the first coordinate and the second coordinate are respectively input into the first calculation formula, and a first parameter measurement result of the first line width is output based on the first calculation formula. Figure 2 and Figure 4 As shown, the first parameter measurement result corresponding to the first line width = the first boundary line The first coordinate on the second boundary line The second coordinate on .

[0048] An embodiment of the present application provides a method for measuring parameters of a display panel. In this method, the display panel includes a substrate and a pixel definition layer disposed on one side of the substrate. The pixel definition layer defines a plurality of pixel openings and includes sidewalls facing the pixel openings. The width of the orthographic projection of the sidewalls on the substrate is the first line width of the display panel. The display panel is photographed on the side of the pixel definition layer facing away from the substrate to obtain a target image. The target image includes a plurality of boundary lines that divide a plurality of color partitions. The plurality of color partitions include luminous areas corresponding to the pixel openings. The plurality of boundary lines include a first boundary line surrounding the luminous area and a second boundary line adjacent to the first boundary line. This means that the structure of the display panel can be determined based on the color partitions and boundary lines in the target image. Then, a first coordinate corresponding to a first target point located on the first boundary line and a second coordinate corresponding to a second target point located on the second boundary line and adjacent to the first target point are obtained. A first parameter measurement result of the first line width of the display panel is determined based on the distance between the first target point on the first boundary line and the second target point on the second boundary line in the target image. Therefore, this method can accurately determine the parameter measurement results of the measurement indicators of the display panel.

[0049] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the display panel further includes an isolation structure located on a side of the pixel definition layer facing away from the substrate. The isolation structure encloses a plurality of isolation openings, and the isolation openings are connected to corresponding pixel openings. At the position of the same isolation opening and the same pixel opening that are connected, the distance between the edge of the orthographic projection of the pixel definition layer on the substrate and the edge of the orthographic projection of the isolation structure on the substrate is equal to the second line width of the display panel. The multiple boundary lines further include a third boundary line located on a side of the second boundary line away from the first boundary line. The method further includes: Obtaining a third coordinate corresponding to a third target point located on the third boundary line and close to the second target point; The distance between the third coordinate and the first coordinate is calculated and used as a second parameter measurement result of the second line width.

[0050] In this embodiment, the display panel further includes an isolation structure on the side of the pixel definition layer facing away from the substrate. The isolation structure encloses an isolation opening for isolating different pixel units. The isolation opening is connected to the corresponding pixel opening; that is, the isolation opening and the pixel opening are connected to form a single opening.

[0051] The second line width in this embodiment refers to the line width from the mask area to the VPDL (MVP). Figure 2 As shown, at the same connected isolation opening and the same pixel opening position, the edge of the positive projection of the pixel definition layer on the substrate corresponds to position F, and the edge of the positive projection of the isolation structure on the substrate corresponds to position D. The distance between position F and position D is the second line width of the display panel.

[0052] Corresponding to the target image, the plurality of boundary lines also include a second boundary line Away from the first boundary line The third boundary line on one side . Combined Figure 4 As shown, the third boundary line Located on the second boundary line Far from the first boundary line one side; the first boundary line , the second boundary line and the third boundary line Arrange them in order in a direction gradually away from the light-emitting area.

[0053] In this embodiment, at the third boundary line Determine the third target point and obtain the third coordinates corresponding to the third target point; wherein the third boundary line The point closest to the second target point is used as the third target point. Then, the distance between the third coordinate and the first coordinate is calculated, and the distance is determined as the second parameter measurement result of the second line width.

[0054] In practical applications, a second calculation formula for the second line width can be pre-set. After determining the first coordinate and the third coordinate, the first coordinate and the third coordinate are respectively input into the second calculation formula, and the second parameter measurement result of the second line width is output based on the second calculation formula. Figure 2 and Figure 4 As shown, the second parameter measurement result corresponding to the second line width = the first boundary line The first coordinate on the third boundary line The second coordinate on .

[0055] According to the method of this embodiment, the second parameter measurement result corresponding to the second line width of the display panel can be determined efficiently and conveniently.

[0056] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the isolation structure includes a first layer and a second layer stacked sequentially in a direction away from the substrate. The orthographic projection of a side of the first layer close to the second layer on the substrate is located within the orthographic projection of the second layer on the substrate. At the same isolation opening, the distance between an edge of the orthographic projection of a side of the first layer close to the second layer on the substrate and an edge of the orthographic projection of the second layer on the substrate is equal to a third line width of the display panel. The multiple boundary lines further include a fourth boundary line located on a side of the third boundary line away from the first boundary line and a fifth boundary line located on a side of the fourth boundary line away from the first boundary line. The method further includes: Obtaining fourth coordinates corresponding to a fourth target point located on the fifth boundary line and close to the third target point; The distance between the fourth coordinate and the third coordinate is calculated and used as a third parameter measurement result of the third line width.

[0057] like Figure 2 As shown, in this embodiment, the isolation structure includes a first layer and a second layer, which are stacked sequentially in a direction away from the substrate. The orthographic projection of the side of the first layer 131 closest to the second layer on the substrate lies within the orthographic projection of the second layer on the substrate; that is, the width of the first layer is smaller than the width of the second layer. Furthermore, the orthographic projection of the side of the first layer 131 closest to the second layer on the substrate is line segment AB, and the orthographic projection of the second layer on the substrate is line segment AD.

[0058] The third line width of the display panel in this embodiment is the line width of the mask area, specifically the distance between the edge of the orthographic projection of the first layer on the substrate closest to the second layer and the edge of the orthographic projection of the second layer on the substrate. Specifically, the edge of the orthographic projection of the first layer on the substrate closest to the second layer corresponds to position B, and the edge of the orthographic projection of the second layer on the substrate corresponds to position D. The distance between positions B and D is the third line width of the display panel.

[0059] Corresponding to the target image, the plurality of boundary lines also include a third boundary line Away from the first boundary line The fourth boundary line on one side and on the fourth boundary line Away from the first boundary line The fifth boundary line on one side . Combined Figure 4 As shown, the fourth boundary line Located on the third boundary line Far from the first boundary line One side, the fifth boundary line Located on the fourth border line Far from the first boundary line One side; the third boundary line , the fourth boundary line and the fifth boundary line Arrange them in order in a direction gradually away from the light-emitting area.

[0060] In this embodiment, at the fifth boundary line Determine the fourth coordinate point and obtain the fourth coordinate corresponding to the fourth coordinate point; wherein the fifth boundary line The point closest to the third target point is used as the fourth target point. Then, the distance between the fourth coordinate and the third coordinate is calculated, and the distance is determined as the third parameter measurement result of the third line width.

[0061] In practical applications, a third calculation formula for the third line width can be pre-set, and after determining the third coordinate and the fourth coordinate, the third coordinate and the fourth coordinate are respectively input into the third calculation formula, and the third parameter measurement result of the third line width is output based on the third calculation formula. Figure 2 and Figure 4 As shown, the third parameter measurement result corresponding to the third line width = the third boundary line The third coordinate on the fifth boundary line The fourth coordinate on .

[0062] According to the method of this embodiment, the third parameter measurement result corresponding to the third line width of the display panel can be determined efficiently and conveniently.

[0063] In some embodiments, the isolation structure further includes a third layer, which is located on a side of the first layer close to the substrate, and the orthographic projection of the side of the first layer close to the third layer on the substrate is located within the orthographic projection of the third layer on the substrate. In other words, the third layer is arranged to protrude from the sidewall of the first layer.

[0064] In some embodiments, the cathode of the light-emitting device overlaps the third layer.

[0065] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the distance between the edge of the orthographic projection of the side of the first layer close to the second layer on the substrate and the edge of the substrate away from the isolation opening is the fourth line width of the display panel; the multiple boundary lines further include a sixth boundary line located on the side of the fifth boundary line away from the first boundary line; and the method further includes: Obtaining a fifth coordinate corresponding to a fifth coordinate point located on the sixth boundary line and close to the fourth coordinate point; The distance between the fourth coordinate and the fifth coordinate is calculated and used as a fourth parameter measurement result of the fourth line width.

[0066] Combine Figure 2 As shown, the fourth line width of the display panel in this embodiment is the line width corresponding to the anode overlap region (Anode Overlap) of the display panel. Specifically, the edge of the orthographic projection of the first layer of the isolation structure, which is adjacent to the second layer, on the substrate corresponds to position B, and the edge of the substrate opposite the isolation opening corresponds to position A. The distance between positions A and B is the fourth line width of the display panel.

[0067] Correspondingly, in the target image, the plurality of boundary lines further includes a sixth boundary line located on a side of the fifth boundary line away from the first boundary line. Figure 4 As shown, the sixth boundary line Located on the fifth boundary line Far from the first boundary line One side, the fourth boundary line , the fifth boundary line and the sixth boundary line Arrange them in order in a direction gradually away from the light-emitting area.

[0068] In this embodiment, a fifth coordinate point is determined on the sixth boundary line, and a fifth coordinate corresponding to the fifth coordinate point is obtained. The point on the sixth boundary line that is closest to the fourth target point is used as the fifth target point. The distance between the fourth coordinate and the fifth coordinate is then calculated, and this distance is determined as the fourth parameter measurement result of the fourth line width.

[0069] In practical applications, a fourth calculation formula for the fourth line width can be pre-set, and after determining the fourth coordinate and the fifth coordinate, the fourth coordinate and the fifth coordinate are respectively input into the fourth calculation formula, and a fourth parameter measurement result of the fourth line width is output based on the fourth calculation formula. Figure 2 and Figure 4 As shown, the fourth parameter measurement result corresponding to the fourth line width = the fifth boundary line The fourth coordinate on the sixth boundary line The fifth coordinate on .

[0070] According to the method of this embodiment, the fourth parameter measurement result corresponding to the fourth line width of the display panel can be determined efficiently and conveniently.

[0071] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the distance between the edge of the orthographic projection of the second layer on the substrate and the edge of the substrate away from the isolation opening is the fifth line width of the display panel. The method further includes: The distance between the third coordinate and the fifth coordinate is calculated and used as a fifth parameter measurement result of the fifth line width.

[0072] The fifth line width of the display panel in this embodiment is the distance between the edge of the orthographic projection of the second layer on the substrate and the edge of the substrate away from the isolation opening. Figure 2 As shown, the edge of the orthographic projection of the second layer on the substrate is position D, and the edge of the substrate away from the isolation opening is position A; the fifth line width is the distance between position A and position D; that is, the sum of the line width of the mask area (Mask Area) and the line width of the anode overlap area (Anode Overlap), that is, MA+AnodeOverlap.

[0073] Combine Figure 4 As shown, in this embodiment, at the sixth boundary line Determine the fifth target point and calculate the sixth boundary line The fifth target point and the third boundary line The calculated distance is determined as the fifth parameter measurement result of the fifth line width; wherein the fifth target point is the point closest to the third target point.

[0074] In practical applications, after respectively calculating the third parameter measurement result of the third line width and the fourth parameter measurement result of the fourth line width, the sum of the third parameter measurement result of the third line width and the fourth parameter measurement result of the fourth line width can be calculated, and the calculation result can be determined as the fifth parameter measurement result of the fifth line width.

[0075] In practical applications, a fifth calculation formula for the fifth line width can be pre-set. After determining the third coordinate and the fifth coordinate, the third coordinate and the fifth coordinate are respectively input into the fifth calculation formula, and the fifth parameter measurement result of the fifth line width is output based on the fifth calculation formula.

[0076] In this embodiment, combined with Figure 2 and Figure 4 As shown, the fifth line width = the fourth line width + the third line width, that is (the fifth boundary line The fourth coordinate on the sixth boundary line The fifth coordinate on the third boundary line) + (the The third coordinate on the fifth boundary line The fourth coordinate on the third boundary line The third coordinate on the sixth boundary line The fifth coordinate on .

[0077] According to the method of this embodiment, the fifth parameter measurement result corresponding to the fifth line width of the display panel can be determined efficiently and conveniently.

[0078] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the distance between the edge of the orthographic projection of the pixel definition layer on the substrate and the edge of the substrate away from the isolation opening is the sixth line width of the display panel; the method further includes: The distance between the first coordinate and the fifth coordinate is calculated and used as a sixth parameter measurement result of the sixth line width.

[0079] The sixth line width of the display panel in this embodiment is the distance between the edge of the orthographic projection of the pixel definition layer on the substrate and the edge of the substrate away from the isolation opening. Figure 2 As shown, the edge of the positive projection of the pixel definition layer on the substrate is position F, and the edge of the substrate away from the isolation opening is position A; the sixth line width is the distance between position A and position F; that is, the sum of the line width of the mask area (Mask Area), the line width of the anode overlap area (Anode Overlap) and the MVP line width, that is, MA+Anode Overlap + MVP (Total).

[0080] Combine Figure 4 As shown, in this embodiment, the first coordinate corresponding to the first target point is obtained, and the fifth coordinate corresponding to the fifth target point is obtained; the distance between the first coordinate and the fifth coordinate is calculated, and the calculated distance is determined as the sixth parameter measurement result of the sixth line width.

[0081] In practical applications, after respectively calculating the second parameter measurement result corresponding to the second line width, the third parameter measurement result corresponding to the third line width, and the fourth parameter measurement result corresponding to the fourth line width, the sum of the second parameter measurement result corresponding to the second line width, the third parameter measurement result corresponding to the third line width, and the fourth parameter measurement result corresponding to the fourth line width can be calculated, and the calculation result can be determined as the sixth parameter measurement result of the sixth line width.

[0082] In this embodiment, combined with Figure 2 and Figure 4 As shown, the sixth line width = the second line width + the third line width + the fourth line width, that is (the third boundary line The third coordinate on the fifth boundary line The fourth coordinate on the fifth boundary line) + (the fourth coordinate on the fifth boundary line) The fourth coordinate on the sixth boundary line The fifth coordinate on the first boundary line) + (the fifth coordinate on the first boundary line) The first coordinate on the third boundary line The second coordinate on the first boundary line The first coordinate on the sixth boundary line The fifth coordinate on .

[0083] In practical applications, a sixth calculation formula for the sixth line width can be pre-set. After determining the first coordinate and the fifth coordinate, the first coordinate and the fifth coordinate are respectively input into the sixth calculation formula, and the sixth parameter measurement result of the sixth line width is output based on the sixth calculation formula.

[0084] According to the method of this embodiment, the sixth parameter measurement result corresponding to the sixth line width of the display panel can be determined efficiently and conveniently.

[0085] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the method further includes: A difference between a first parameter measurement result of the first line width and a second parameter measurement result of the second line width is calculated and used as a seventh parameter measurement result of the seventh line width.

[0086] The seventh line width in this embodiment is the distance between the first line width and the second line width, that is, the line width from the MVP to the pixel definition layer (MVP-PDL line width).

[0087] Specifically, after calculating the first parameter measurement result of the first line width and the second parameter measurement result of the second line width, the difference between the first parameter measurement result and the second parameter measurement result is calculated, and the calculated difference is determined as the seventh parameter measurement result of the seventh line width.

[0088] According to the method of this embodiment, the seventh parameter measurement result corresponding to the seventh line width of the display panel can be determined efficiently and conveniently.

[0089] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the angle between the sidewall and the side of the pixel definition layer close to the substrate is the first angle of the display panel, and the method further includes: Obtaining the thickness of the pixel definition layer and using it as an eighth parameter measurement result of an eighth line width of the display panel; calculating a first ratio between the eighth parameter measurement result and the first parameter measurement result; An arc tangent function value of the first ratio is calculated and used as a ninth parameter measurement result of the first angle.

[0090] refer to Figure 2 In this embodiment, the first angle is the angle of the pixel definition layer (PDL angle), specifically the angle between the sidewall of the pixel definition layer and the side of the pixel definition layer closest to the substrate. In this embodiment, the first angle of the display panel is determined based on the thickness of the pixel definition layer and the first line width. Specifically, the thickness of the pixel definition layer is first determined using RS sampling data from a front-end station, and used as the eighth parameter measurement result for the eighth line width of the display panel.

[0091] Then, based on the geometric relationship between the film thickness of the pixel definition layer and the first line width, the first ratio between the eighth parameter measurement result of the eighth line width and the first parameter measurement result of the first line width is calculated; then the inverse tangent function value of the first ratio is calculated, and the calculation result is determined as the ninth parameter measurement result of the first angle.

[0092] In practical applications, the seventh calculation formula for the first angle can be set in advance. After determining the first parameter measurement result of the first line width and the eighth parameter measurement result of the eighth line width, the first parameter measurement result and the eighth parameter measurement result are respectively input into the seventh calculation formula, and the ninth parameter measurement result of the first angle is output based on the seventh calculation formula.

[0093] In this embodiment, the preset seventh calculation formula is: α=tan -1 (the fourth parameter measurement result of the fourth line width / the first parameter measurement result of the first line width); wherein α represents the first angle of the display panel.

[0094] It should be noted that the prior art solutions cannot directly measure the first angle of the display panel. According to the method of this embodiment, the fifth parameter measurement result of the first angle of the display panel can be calculated efficiently and accurately.

[0095] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the method further includes: Determine a target measurement indicator; the target measurement indicator is any one of the measurement indicators; the measurement indicators include a first line width, a second line width, a third line width, a fourth line width, a fifth line width, a sixth line width and a first angle; determining a target offset value corresponding to a target measurement indicator; The target parameter measurement result corresponding to the target measurement index is calibrated using the target offset value to obtain an updated target parameter measurement result.

[0096] The offset value is the systematic deviation of the measuring device, that is, the inherent difference between the actual measurement value and the designed value. Generally, different measuring devices have different offset values ​​for the same measurement indicator, and the same measuring device also has different offset values ​​for different measurement indicators.

[0097] In this embodiment, a target measurement indicator is first determined from a plurality of measurement indicators; the measurement indicators include a first line width, a second line width, a third line width, a fourth line width, a fifth line width, a sixth line width and a first angle.

[0098] Then, a target offset value corresponding to the target measurement indicator of the measuring device is obtained; the target parameter measurement result is calibrated using the target offset value to obtain an updated target parameter measurement result; the target parameter measurement result includes a first parameter measurement result, a third parameter measurement result, a fourth parameter measurement result, and a sixth parameter measurement result.

[0099] In a specific example, the target parameter measurement result is calibrated using the target offset value, and the target parameter measurement result can be obtained by subtracting the target offset value from the target parameter measurement result to obtain an updated target parameter measurement result.

[0100] It should be noted that this embodiment does not limit the specific correspondence between the measurement indicators and the offset values. Table 1 is a table of correspondence between different measurement indicators and offset values ​​provided in the embodiment of this application.

[0101] Table 1 Correspondence between different measurement indicators and offset values

[0102] As shown in Table 1, assuming the target measurement metric is the fifth linewidth, the corresponding fifth parameter measurement result is Xμm, and the measurement device's target offset for this target measurement metric (fifth linewidth) is -0.3μm, the fifth parameter measurement result for the fifth linewidth needs to be calibrated using the target offset value to obtain an updated fifth parameter measurement result. Specifically, 0.3μm is subtracted from the calculated fifth parameter measurement result for the fifth linewidth, resulting in an updated fifth parameter measurement result of (X - 0.3)μm.

[0103] According to the method of this embodiment, the parameter measurement result is further corrected using the offset value of the measuring device, thereby improving the accuracy of the updated parameter measurement result.

[0104] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the method further includes: Obtain target standard parameters corresponding to target measurement indicators; Calculate the difference between the target parameter measurement result and the target standard parameter of the target measurement indicator; If the difference is greater than a preset difference threshold, it is determined that the display panel does not meet the preset standard.

[0105] In this embodiment, after obtaining the target parameter measurement result corresponding to the target measurement indicator, the target standard parameter corresponding to the target measurement indicator is obtained; then, the target parameter measurement result is compared with the target standard parameter to calculate the difference between the target parameter measurement result and the target standard parameter of the target measurement indicator; The calculated difference is then compared with a preset difference threshold; if the difference is less than or equal to the preset difference threshold, it indicates that the error of the graphic circuit of the display panel is within the standard range, and therefore it is determined that the graphic circuit of the display panel meets the preset standard; if the difference is greater than the preset difference threshold, it indicates that the error of the graphic circuit of the display panel exceeds the standard range, and therefore it is determined that the graphic circuit of the display panel does not meet the preset standard.

[0106] In another embodiment, after the target parameter measurement result is updated using the target offset value, the updated target parameter measurement result is compared with the target standard parameter of the measurement indicator. If the difference between the updated target parameter measurement result and the target standard parameter is less than a preset difference threshold, it indicates that the graphic circuit of the display panel meets the preset standard. Otherwise, that is, the difference between the updated target parameter measurement result and the target standard parameter is greater than the preset difference threshold, it indicates that the graphic circuit of the display panel does not meet the preset standard.

[0107] According to the method of this embodiment, it is possible to efficiently and directly determine whether the display panel meets the preset standard.

[0108] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, acquiring a target image includes: Step 1: Acquire a target area image containing a target area in a display panel; the target area is an area where a graphic circuit corresponding to a measurement indicator is located; the graphic circuit includes a substrate, a pixel definition layer, and an isolation structure.

[0109] During the display panel manufacturing process, the pixel definition layer needs to be peeled off after completing its function. Since the structure after peeling can directly reflect the quality of the pixelization process, this embodiment can obtain an image of the target area of ​​the display panel after peeling the pixel definition layer to measure the display panel parameters.

[0110] Specifically, the magnification of the automatic optical inspection (AOI) or repair (REP) equipment is set, and a high-magnification lens is used to capture the area of ​​the display panel where the graphic circuits are located at the set magnification, obtaining a high-resolution image of the target area. The graphic circuits include the substrate, pixel definition layer, and isolation structure.

[0111] After capturing the target area image, the automatic optical inspection device or repair device uploads the target area image to the DFS (Data File Server); the terminal device obtains the target area image from the DFS server.

[0112] Figure 5 A schematic diagram of a process for capturing an image of a target area provided in an embodiment of the present application. Figure 5 As shown, in a specific embodiment, the shooting parameters are first set: the detection point (InitialPoint) is set according to the graphic line, such as the coordinates (x, y), that is, the position of the fixed-point shooting is determined; the spacing (Gap) between the detection points is set, including the horizontal spacing and the vertical spacing, and the rows (Rows) and columns (Columns) are adjusted to adjust the shooting range size; the magnification (Magnification) is adjusted to set the magnification, which is generally set to 10; after completing the shooting parameter setting, the AOI equipment is used to shoot each detection point according to the layout defined in the array diagram to obtain an image of the target area.

[0113] Furthermore, when determining inspection points, the product coordinates of the graphic circuit are converted into the mechanical coordinates of the camera. The mechanical coordinates are then used to determine the location of the fixed-point image, i.e., the inspection point. If there are a large number of inspection points, each inspection point can be pre-written in a spreadsheet document, which can then be imported into the camera.

[0114] In the manufacturing process of semiconductor packaging and display panels, bumps are tiny structures used to connect different layers or components. The size and shape of the bumps are crucial to the performance and reliability of the display panel. In this embodiment, the graphic circuit also includes bumps, and the measurement indicators include key dimensions of the bumps, such as height, width, and pitch.

[0115] In actual applications, when using automated optical inspection equipment to capture images of the target area, the time required to complete the measurement is proportional to the number of target area images captured, so the number of target area images cannot be increased indefinitely. In order to achieve the initial inspection objectives while avoiding excessively long single-product production time (Tact time), after completing the initial inspection objectives, the photography tasks of some points that no longer need to be inspected will be deleted to optimize the inspection process and improve efficiency.

[0116] Step 2: Mark the area to be measured corresponding to the graphic line in the target area image.

[0117] Specifically, based on the design and process requirements of the display panel, measurement position information corresponding to the graphic circuits of the display panel can be obtained, and the area to be measured corresponding to the measurement position information can be marked in the target area image. Alternatively, the area to be measured corresponding to the graphic circuits can be marked in the target area image based on a preset mark (such as an alignment mark).

[0118] It should be noted that marking the area to be measured corresponding to the graphic line can be achieved by marking the position of the line width with a red frame or a line. This embodiment does not limit the marking method.

[0119] In a specific example, if the edge of the pattern circuit is convex, combined with Figure 6 The process of determining the area to be measured is as follows: Obtain the pre-set convex point positions that need to be photographed; take fixed-point photos based on the convex point positions: use the high-magnification lens of the automatic optical inspection equipment to photograph the convex point positions to obtain a high-resolution image of the convex point positions, that is, the target area image; based on the preset convex mark, mark the area to be measured corresponding to the measurement position information in the target area image to clearly observe the characteristics of the convex point.

[0120] Step 3: Perform image processing on the area to be measured to obtain the target image.

[0121] After the area to be measured is determined, image processing is performed on the area to be measured, including grayscale processing, to obtain a target image; the target image includes multiple structural layers, and each structural layer is used to identify corresponding graphic circuits in the display panel.

[0122] According to the method of this embodiment, a target area image containing a target area in a display panel is obtained, and then the area to be measured corresponding to the graphic circuit is marked in the target area image. This allows the area to be measured of the graphic circuit in the display panel to be quickly determined. That is, the area to be measured of the graphic circuit can be efficiently and accurately locked to determine the target image, thereby improving the efficiency of parameter measurement of the display panel.

[0123] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, image processing is performed on the area to be measured to obtain a target image, including: For each pixel in the area to be measured, determine the grayscale value corresponding to the pixel in each basic color channel; Determine the grayscale value range corresponding to each basic color channel, and determine the target color channel based on each grayscale value range; The boundary line is determined according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and color partitions are divided according to the boundary line to obtain the target image.

[0124] Specifically, after determining the area to be measured, the target area image is converted into R (red), G (green), and B (blue) data. Specifically, for each pixel in the area to be measured, the pixel's color information can be decomposed into grayscale values ​​for three basic color channels: R (red), G (green), and B (blue); the grayscale values ​​of the basic color channels range from 0 to 255.

[0125] Then, for each basic color channel, the grayscale value range of the grayscale values ​​in the basic color channel is determined, thereby determining the grayscale value contrast. Specifically, the difference between the maximum grayscale value and the minimum grayscale value in the basic color channel is calculated. This difference represents the grayscale value contrast of the grayscale values ​​in the basic color channel, i.e., grayscale value contrast = maximum grayscale value in the basic color channel - minimum grayscale value.

[0126] Compare the grayscale contrasts corresponding to the basic color channels and determine the basic color channel with the largest grayscale contrast as the target color channel. For example, if the grayscale contrasts corresponding to the grayscale values ​​in the green channel are the largest, then the green channel is selected as the target color channel.

[0127] In a specific embodiment, determining the grayscale value range corresponding to each basic color channel and determining the target color channel according to each grayscale value range includes: For each basic color channel, determining the grayscale value contrast corresponding to the basic color channel; The basic color channel with the largest grayscale value contrast is determined as the target color channel.

[0128] It should be noted that different basic color channels have different performances on the edges of convex points. Therefore, the basic color channel with high grayscale contrast is selected as the analysis benchmark, that is, the basic color channel with the largest grayscale value contrast is determined as the target color channel for measuring the measurement index of convex points.

[0129] After determining the target color channel, corresponding boundary lines are determined based on the grayscale distribution of each target grayscale value in the target color channel in a preset direction. The plurality of boundary lines are used to demarcate corresponding color regions, thereby obtaining a target image. The target grayscale values ​​are the grayscale values ​​corresponding to the target color channel. The preset direction may be a measurement direction, which includes a horizontal direction and a vertical direction.

[0130] According to the method of this embodiment, by determining the target color channel, determining the boundary line according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and dividing the color partitions according to the boundary line, a target image is obtained, thereby making it easier to identify the edge position of the graphic circuit, thereby improving the accuracy and convenience of parameter measurement of the display panel.

[0131] On the basis of the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, If the edge of the graphic line is a straight line or a convex shape, a boundary line is determined according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and color partitions are divided according to the boundary line to obtain a target image, including: Determine the grayscale value variation of each target grayscale value in the target color channel in the measurement direction, determine the boundary line according to the area with the largest grayscale value variation, and divide the color partitions according to the boundary line to obtain the target image.

[0132] The grayscale value variation in the measurement direction refers to the magnitude variation of the grayscale value along the measurement direction.

[0133] Specifically, the core of determining the boundary line is to identify the area in the area to be measured where the grayscale value changes most significantly, that is, the area where the grayscale value changes most significantly is generally the edge of the graphic line; in the target image, the area where the grayscale value changes most significantly is also the boundary line of the color partition.

[0134] Therefore, after determining the target grayscale value corresponding to the target color channel, each target grayscale value can be arranged along the pixel measurement direction to obtain a one-dimensional target grayscale value. A differential calculation (first-order derivative) is performed on each target grayscale value to determine the brightness change of the target grayscale value, thereby obtaining the grayscale value change of the target grayscale value in the preset direction. Alternatively, the grayscale value change of the target grayscale value can be determined by calculating the difference between adjacent target grayscale values.

[0135] After determining the grayscale value variation of each target grayscale value in the target color channel in the measurement direction, the target grayscale value having the largest brightness variation among the target grayscale values ​​is determined, that is, the local maximum and local minimum values ​​are determined; boundary lines are determined based on the local maximum and local minimum values, and the multiple boundary lines divide the target image into multiple color partitions.

[0136] According to the method of this embodiment, the boundary line can be determined from the target image efficiently and accurately, and color partitions can be divided according to the boundary line. Subsequently, the parameter measurement results corresponding to the measurement indicators can be determined efficiently and accurately based on the target image.

[0137] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, the grayscale value variation of each target grayscale value in the target color channel in the measurement direction is determined, and the structural layer is determined according to the area with the largest grayscale value variation to obtain the target image, including: Generate a line graph for each target grayscale value in the target color channel along the measurement direction; the horizontal axis of the line graph represents the corresponding pixel position along the measurement direction, and the vertical axis represents the grayscale value; The area with the largest grayscale value change is determined based on the line graph, the boundary line is determined according to the area with the largest grayscale value change, and the color partition is divided according to the boundary line to obtain the target image.

[0138] The measurement direction includes the horizontal direction and the vertical direction.

[0139] In one specific embodiment, a target grayscale value corresponding to a target color channel is first determined, and then a line graph is generated for each target grayscale value along the measurement direction. For example, if the measurement direction is horizontal, the horizontal axis of the line graph represents the horizontal distribution of pixel points, and the vertical axis represents the grayscale value.

[0140] It can be understood that the key to determining the boundary line is to identify the area within the measured area where the grayscale value changes most significantly. Therefore, after determining the line graph, the boundary line can be determined based on the peak and valley points in the line graph. Alternatively, the differential value of the grayscale curve corresponding to each pixel point can be calculated based on the line graph, and the maximum and minimum differential values ​​can be used as the boundary line. Multiple color partitions can then be divided based on the boundary line.

[0141] It should be noted that, when calculating the parameter measurement result corresponding to the measurement index, the parameter measurement result of the measurement index may be determined according to the width of the pixel interval between the corresponding peak point and valley point.

[0142] According to the method of this embodiment, the boundary line of the graphic circuit can be determined efficiently and accurately, and color partitions can be divided according to the boundary line. Subsequently, the parameter measurement results corresponding to the measurement indicators can be determined efficiently and accurately based on the target image.

[0143] If the edge of the graphic circuit is a diagonal line, since the grayscale change direction of the diagonal line is inconsistent with the horizontal or vertical direction, it may be impossible to accurately identify the edge position of the diagonal line using the differential method directly. Therefore, based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. Specifically, in this embodiment, if the edge of the graphic circuit is a diagonal line, the boundary line is determined based on the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and color partitions are divided according to the boundary line to obtain the target image, including: According to the grayscale value distribution of each target grayscale value in the target color channel in the oblique line direction, the boundary line corresponding to the oblique line is determined, and color partitions are divided according to the boundary line to obtain the target image.

[0144] It should be noted that if the edge of a graphic line is a diagonal line, the measurement can be performed in a tilted state. The measurement direction can be adjusted to align with the direction of the diagonal line by rotating the image or adjusting the direction of the edge detection algorithm.

[0145] Alternatively, the target grayscale values ​​of the target color channel can be analyzed along the diagonal direction to find the maximum and minimum points of the target grayscale values ​​along the diagonal direction. Based on the maximum and minimum points, the boundary line corresponding to the diagonal line can be determined, and color partitions can be divided based on the boundary line to thereby determine the target image. However, this embodiment does not limit the specific values ​​of the maximum and minimum points.

[0146] In practical applications, multiple target area images within a preset time period can be obtained, and the maximum and minimum points of the target grayscale value can be determined for each target area image; the average value of the maximum points corresponding to the multiple target area images and the average value of the minimum points corresponding to the multiple target area images are determined as boundary lines, and the corresponding color partitions are divided according to the boundary lines, thereby improving the accuracy of determining the corresponding boundary lines of the diagonal lines.

[0147] According to the method of this embodiment, when the edge of the graphic circuit is a slanted line, the boundary line can be accurately determined and the color partitions can be divided.

[0148] It should be noted that according to the method of this embodiment, an AMOLED using ViP technology is photographed using AOI equipment to obtain an image of the target area, which is then analyzed using FIB (Focused Ion Beam) slice measurement technology to determine the parameter measurement results of the measurement indicators, and then RS (review) measurement is performed. This method can effectively improve the problem of dark pixels caused by CVD1 package suspension or breakage.

[0149] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0150] It should be noted that the information collection process (such as the facial image collection process, fingerprint information collection process, etc.) / feature extraction process involved in this application is performed with the user's knowledge and permission, that is, the information collection process / feature extraction process complies with the requirements of laws and regulations and does not constitute an act that harms the public interest.

[0151] Figure 7 The figure shows a schematic diagram of the structure of a device for measuring parameters of a display panel provided by an embodiment of the present application. The display panel includes a substrate and a pixel definition layer provided on one side of the substrate. The pixel definition layer defines a plurality of pixel openings and includes sidewalls facing the pixel openings. The width of the orthographic projection of the sidewalls on the substrate is the first line width of the display panel. Figure 7 As shown, a device for measuring parameters of a display panel in this embodiment includes: An image acquisition module 710 is configured to photograph the display panel on a side of the pixel definition layer facing away from the substrate and acquire a target image, wherein the target image includes a plurality of boundary lines that divide a plurality of color partitions, the plurality of color partitions including light-emitting areas corresponding to pixel openings, and the plurality of boundary lines including a first boundary line surrounding the light-emitting area and a second boundary line adjacent to the first boundary line; A coordinate acquisition module 720 is configured to acquire a first coordinate corresponding to a first target point located on a first boundary line, and a second coordinate corresponding to a second target point located on a second boundary line and close to the first target point; The parameter measurement result calculation module 730 is configured to calculate the distance between the first coordinate and the second coordinate and use the calculated distance as the first parameter measurement result of the first line width.

[0152] An apparatus for measuring parameters of a display panel provided in an embodiment of the present application has the same beneficial effects as the above-mentioned method for measuring parameters of a display panel.

[0153] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of this application. Their specific functions and technical effects can be found in the method embodiment section and will not be repeated here.

[0154] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by 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 embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0155] Figure 8 This is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application. Figure 8 As shown, the terminal device 800 of this embodiment includes a memory 801, a processor 802, and a computer program 803 stored in the memory 801 and executable on the processor 802; when the processor 802 executes the computer program 803, the steps in the above-mentioned method embodiments for measuring parameters of a display panel are implemented; or when the processor 802 executes the computer program 803, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0156] Exemplarily, the computer program 803 may be divided into one or more modules / units, one or more modules / units being stored in the memory 801 and executed by the processor 802 to implement the method of the embodiment of the present application. One or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program 803 in the terminal device 800. For example, the computer program 803 may be divided into multiple modules, and the specific functions of each module are as follows: an image acquisition module, configured to photograph the display panel on a side of the pixel definition layer facing away from the substrate and acquire a target image, wherein the target image includes a plurality of boundary lines dividing a plurality of color partitions, the plurality of color partitions including light-emitting areas corresponding to pixel openings, and the plurality of boundary lines including a first boundary line surrounding the light-emitting area and a second boundary line proximate to the first boundary line; A coordinate acquisition module, configured to acquire a first coordinate corresponding to a first target point located on a first boundary line, and a second coordinate corresponding to a second target point located on a second boundary line and close to the first target point; The parameter measurement result calculation module is used to calculate the distance between the first coordinate and the second coordinate and use it as the first parameter measurement result of the first line width.

[0157] In application, the terminal device 800 can be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The terminal device 800 can include but is not limited to a memory 801 and a processor 802. Those skilled in the art will understand that Figure 8 It is only an example of a terminal device and does not constitute a limitation of the terminal device. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.; among them, the input and output devices may include cameras, audio acquisition / playback devices, display screens, etc.; the network access device may include a communication module for wireless communication with external devices.

[0158] In applications, the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), 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.

[0159] In applications, memory can be an internal storage unit of a terminal device, such as a hard drive or memory; it can also be an external storage device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. It can also include both internal and external storage units. Memory is used to store operating systems, applications, boot loaders, data, and other programs, such as computer program code. Memory can also be used to temporarily store data that has been output or is about to be output.

[0160] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0161] The present application implements all or part of the process steps in the above-described method embodiments by instructing the relevant hardware through a computer program. The computer program may be stored in a computer-readable storage medium. When executed by a processor, the computer program may implement the steps of each of the above-described method embodiments. The computer program includes computer program code, which may be in source code form, object code form, an executable file, or some intermediate form. Computer-readable media may include at least: any entity or device capable of carrying computer program code to a terminal device, a recording medium, computer memory, read-only memory (ROM), random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium. Examples include a USB flash drive, a removable hard drive, a magnetic disk, or an optical disk.

[0162] A computer-readable storage medium provided in an embodiment of the present application has the same beneficial effects as the above-mentioned method for measuring parameters of a display panel.

[0163] An embodiment of the present application further provides a computer program product, including a computer program, which can implement the steps in the above-mentioned method embodiments when executed by a processor.

[0164] A computer program product provided in an embodiment of the present application has the same beneficial effects as the above-mentioned method for measuring parameters of a display panel.

[0165] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0166] Those skilled in the art will appreciate that the devices and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0167] In the embodiments provided herein, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interface, or the devices may be indirectly coupled or communicated in some manner, whether electrical, mechanical, or other.

[0168] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A method for measuring parameters of a display panel, characterized in that: The display panel includes a substrate and a pixel definition layer disposed on one side of the substrate, the pixel definition layer defining a plurality of pixel openings and including sidewalls facing the pixel openings, wherein the width of the orthographic projection of the sidewalls on the substrate is a first line width of the display panel, and the method includes: photographing the display panel on a side of the pixel definition layer facing away from the substrate and acquiring a target image, wherein the target image includes a plurality of boundary lines dividing a plurality of color partitions, the plurality of color partitions including light-emitting areas corresponding to the pixel openings, and the plurality of boundary lines including a first boundary line surrounding the light-emitting area and a second boundary line adjacent to the first boundary line; Acquire a first coordinate corresponding to a first target point located on the first boundary line, and a second coordinate corresponding to a second target point located on the second boundary line and close to the first target point; The distance between the first coordinate and the second coordinate is calculated and used as a first parameter measurement result of the first line width.

2. The method according to claim 1, characterized in that The display panel further includes an isolation structure located on a side of the pixel definition layer facing away from the substrate, the isolation structure enclosing a plurality of isolation openings, the isolation openings communicating with corresponding pixel openings, and a distance between an edge of an orthographic projection of the pixel definition layer on the substrate and an edge of an orthographic projection of the isolation structure on the substrate at a position where the same isolation opening and the same pixel opening are connected is equal to a second line width of the display panel, the plurality of boundary lines further including a third boundary line located on a side of the second boundary line away from the first boundary line, and the method further including: Acquire third coordinates corresponding to a third target point located on the third boundary line and close to the second target point; The distance between the third coordinate and the first coordinate is calculated and used as a second parameter measurement result of the second line width.

3. The method according to claim 2, characterized in that The isolation structure includes a first layer and a second layer stacked in sequence in a direction away from the substrate, an orthographic projection of a side of the first layer close to the second layer on the substrate is located within an orthographic projection of the second layer on the substrate, and at the same position of the isolation opening, a distance between an edge of the orthographic projection of the side of the first layer close to the second layer on the substrate and an edge of the orthographic projection of the second layer on the substrate is equal to a third line width of the display panel, the multiple boundary lines further include a fourth boundary line located on a side of the third boundary line away from the first boundary line and a fifth boundary line located on a side of the fourth boundary line away from the first boundary line, and the method further includes: Acquire fourth coordinates corresponding to a fourth target point located on the fifth boundary line and close to the third target point; The distance between the fourth coordinate and the third coordinate is calculated and used as a third parameter measurement result of the third line width.

4. The method according to claim 3, characterized in that The distance between an edge of an orthographic projection of a side of the first layer close to the second layer on the substrate and an edge of the substrate away from the isolation opening is a fourth line width of the display panel; the multiple boundary lines further include a sixth boundary line located on a side of the fifth boundary line away from the first boundary line; and the method further includes: Obtaining a fifth coordinate corresponding to a fifth coordinate point located on the sixth boundary line and close to the fourth coordinate point; The distance between the fourth coordinate and the fifth coordinate is calculated and used as a fourth parameter measurement result of the fourth line width.

5. The method according to claim 4, characterized in that The distance between the edge of the orthographic projection of the second layer on the substrate and the edge of the substrate away from the isolation opening is the fifth line width of the display panel; the method further includes: The distance between the third coordinate and the fifth coordinate is calculated and used as a fifth parameter measurement result of the fifth line width.

6. The method according to claim 5, characterized in that The distance between the edge of the orthographic projection of the pixel definition layer on the substrate and the edge of the substrate away from the isolation opening is the sixth line width of the display panel; the method further includes: The distance between the first coordinate and the fifth coordinate is calculated and used as a sixth parameter measurement result of the sixth line width.

7. The method according to claim 4, characterized in that The method further comprises: A difference between the first parameter measurement result of the first line width and the second parameter measurement result of the second line width is calculated and used as a seventh parameter measurement result of the seventh line width.

8. The method according to claim 6, characterized in that The angle between the sidewall and the side of the pixel definition layer close to the substrate is a first angle of the display panel, and the method further includes: Obtaining a thickness of the pixel definition layer and using the thickness as an eighth parameter measurement result of an eighth line width of the display panel; calculating a first ratio between the eighth parameter measurement result and the first parameter measurement result; An arc tangent function value of the first ratio is calculated and used as a ninth parameter measurement result of the first angle.

9. The method according to claim 8, characterized in that The method further comprises: Determining a target measurement indicator; the target measurement indicator is any one of the measurement indicators; the measurement indicators include the first line width, the second line width, the third line width, the fourth line width, the fifth line width, the sixth line width and the first angle; Obtaining a target offset value corresponding to the target measurement indicator; The target parameter measurement result corresponding to the target measurement indicator is calibrated using the target offset value to obtain an updated target parameter measurement result.

10. The method according to claim 9, characterized in that The method further comprises: Obtaining target standard parameters corresponding to the target measurement indicator; Calculating the difference between the target parameter measurement result of the target measurement indicator and the target standard parameter; If the difference is greater than a preset difference threshold, it is determined that the display panel does not meet a preset standard.

11. The method according to any one of claims 2 to 8, characterized in that The acquiring of the target image comprises: Acquire a target area image containing a target area in the display panel; the target area is an area where a graphic circuit corresponding to a measurement indicator is located; the graphic circuit includes the substrate, the pixel definition layer, and the isolation structure; Marking an area to be measured corresponding to the graphic circuit in the target area image; Perform image processing on the area to be measured to obtain a target image.

12. The method according to claim 11, characterized in that The performing image processing on the area to be measured to obtain a target image includes: For each pixel in the area to be measured, determining the grayscale value corresponding to each basic color channel of the pixel; Determining a grayscale value range corresponding to each of the basic color channels, and determining a target color channel based on each of the grayscale value ranges; The boundary line is determined according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and the color partitions are divided according to the boundary line to obtain a target image.

13. The method according to claim 12, characterized in that Determining the grayscale value range corresponding to each of the basic color channels, and determining the target color channel according to each of the grayscale value ranges, includes: For each of the basic color channels, determining the grayscale value contrast corresponding to the basic color channel; The basic color channel with the largest grayscale value contrast is determined as the target color channel.

14. The method according to claim 12, characterized in that If the edge of the graphic circuit is a straight line or a convexity, determining the boundary line according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and dividing the color partitions according to the boundary line to obtain the target image includes: Determine the grayscale value variation of each target grayscale value in the target color channel in the measurement direction, determine the boundary line according to the area with the largest grayscale value variation, and divide the color partitions according to the boundary line to obtain the target image.

15. The method according to claim 14, characterized in that Determining the grayscale value variation of each target grayscale value in the target color channel in the measurement direction, determining the boundary line according to the area with the largest grayscale value variation, and dividing the color partitions according to the boundary line to obtain the target image includes: Generate a line graph for each target grayscale value in the target color channel along the measurement direction; the horizontal axis of the line graph represents the corresponding pixel position along the measurement direction, and the vertical axis represents the grayscale value; The region with the largest grayscale value variation is determined based on the line graph, the boundary line is determined according to the region with the largest grayscale value variation, and color partitions are divided according to the boundary line to obtain a target image.

16. The method according to claim 12, characterized in that If the edge of the graphic circuit is a slant line, determining the boundary line according to the grayscale value distribution of each target grayscale value in the target color channel in a preset direction, and dividing the color partitions according to the boundary line to obtain the target image includes: According to the grayscale value distribution of each target grayscale value in the target color channel in the oblique line direction, a boundary line corresponding to the oblique line is determined, and the color partitions are divided according to the boundary line to obtain a target image.

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