A method of measuring a parameter of a display panel

Abstract

The application provides a method for measuring parameters of a display panel, the display panel comprising a substrate and a pixel definition layer arranged on one side of the substrate, the pixel definition layer defining a plurality of pixel openings and comprising sidewalls facing the pixel openings, a width of a normal projection of the sidewalls on the substrate being a first line width of the display panel, the method comprising: taking a photo of the display panel on a side of the pixel definition layer away from the substrate and obtaining a target image, the target image comprising a plurality of boundary lines dividing a plurality of color zones, the plurality of boundary lines comprising a first boundary line surrounding a light-emitting zone and a second boundary line close to the first boundary line; obtaining a first coordinate corresponding to a first target point on the first boundary line and a second coordinate corresponding to a second target point on the second boundary line and close to the first target point; and calculating a distance between the first coordinate and the second coordinate as a first parameter measurement result of the first line width. The method can accurately determine the parameter measurement result of the measurement index of the display panel.

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

[0002] In recent years, organic light emitting technology has developed rapidly. In the preparation process of traditional display panels, fine metal mask (FMM) is usually used to realize the patterning of light emitting pixels. FMM technology is mature and has rich mass production experience. However, FMM technology also has the problems of limited precision, high development cost and long development cycle. The fine metal mask-free technology eliminates the limitations of traditional OLED process on display screen size, resolution and other screen performance, and has the advantages of high performance, full size and agile delivery. The patents CN118251982A, CN115666161A and CN116648095A describe the related content of fine metal mask-free technology, which are referred to for reference.

[0003] In the preparation process of a display panel, some key measurement parameters such as the line width of a pixel definition layer and the MVP line width (the line width from the mask area to the VPDL) need to be accurately measured and controlled to ensure that the display performance of the finally produced display panel can meet the design requirements. At present, CD (Critical Dimension) measurement equipment is generally used to measure two-dimensional sizes such as line width and pitch, but since the boundary points cannot be clearly determined, the parameter measurement results corresponding to the measurement parameters cannot be accurately determined.

[0004] Therefore, how to improve the accuracy of parameter measurement of a display panel is a technical problem to be solved by those skilled in the art at present. SUMMARY

[0005] The present application aims to provide a method, device, terminal equipment, computer readable storage medium and computer program product for measuring parameters of a display panel, which aims to improve the accuracy of parameter measurement of a 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 arranged on one side of the substrate, the pixel definition layer defines a plurality of pixel openings and includes a side wall facing the pixel openings, the width of the projection of the side wall on the substrate is a first line width of the display panel, and the method includes:

[0007] photographing the display panel from a side of the pixel definition layer away from the substrate, and obtaining a target image, wherein the target image comprises a plurality of boundary lines dividing a plurality of color partitions, the plurality of color partitions comprise a light emitting area corresponding to the pixel opening, and the plurality of boundary lines comprise a first boundary line surrounding the light emitting area and a second boundary line close to the first boundary line;

[0008] 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;

[0009] calculating a distance between the first coordinate and the second coordinate as a first parameter measurement result of the first line width.

[0010] In one of the embodiments, the display panel further comprises an isolation structure located on the side of the pixel definition layer away from the substrate, the isolation structure encloses a plurality of isolation openings, the isolation openings are in communication with the corresponding pixel openings, and at the same position of the communication isolation opening and the pixel opening, a distance between an edge of a normal projection of the pixel definition layer on the substrate and an edge of a normal projection of the isolation structure on the substrate is a second line width of the display panel, the plurality of boundary lines further comprise a third boundary line located on a side of the second boundary line away from the first boundary line, and the method further comprises:

[0011] obtaining a third coordinate corresponding to a third target point located on the third boundary line and close to the second target point;

[0012] calculating a distance between the third coordinate and the first coordinate as a second parameter measurement result of the second line width.

[0013] In one of the embodiments, the isolation structure comprises a first layer and a second layer stacked in sequence in a direction away from the substrate, a normal projection of a side of the first layer close to the second layer on the substrate is located within a normal projection of the second layer on the substrate, at the same position of the isolation opening, a distance between an edge of the normal projection of the side of the first layer close to the second layer on the substrate and an edge of the normal projection of the second layer on the substrate is a third line width of the display panel, the plurality of boundary lines further comprise 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 comprises:

[0014] obtaining a fourth coordinate corresponding to a fourth target point located on the fifth boundary line and close to the third target point;

[0015] A distance between the fourth coordinate and the third coordinate is calculated as a third parameter measurement result of the third line width.

[0016] In one of the embodiments, a distance between an edge of a normal projection of the first layer on the substrate close to the second layer and an edge of the substrate away from the direction of the isolation opening is a fourth line width of the display panel; the plurality of boundary lines further comprises a sixth boundary line located on a side of the fifth boundary line away from the first boundary line; the method further comprises:

[0017] A fifth coordinate corresponding to a fifth coordinate point located on the sixth boundary line and close to the fourth coordinate point is obtained;

[0018] A distance between the fourth coordinate and the fifth coordinate is calculated as a fourth parameter measurement result of the fourth line width.

[0019] In one of the embodiments, a distance between an edge of a normal projection of the second layer on the substrate and an edge of the substrate away from the direction of the isolation opening is a fifth line width of the display panel; the method further comprises:

[0020] A distance between the third coordinate and the fifth coordinate is calculated as a fifth parameter measurement result of the fifth line width.

[0021] In one of the embodiments, a distance between an edge of a normal projection of the pixel definition layer on the substrate and an edge of the substrate away from the direction of the isolation opening is a sixth line width of the display panel; the method further comprises:

[0022] A distance between the first coordinate and the fifth coordinate is calculated as a sixth parameter measurement result of the sixth line width.

[0023] In one of the embodiments, the method further comprises:

[0024] 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 as a seventh parameter measurement result of a seventh line width.

[0025] In one of the embodiments, an included angle between the side wall and the pixel definition layer close to the substrate is a first angle of the display panel, and the method further comprises:

[0026] A thickness of the pixel definition layer is obtained as a seventh parameter measurement result of a seventh line width of the display panel;

[0027] A first ratio between the seventh parameter measurement result and the first parameter measurement result is calculated.

[0028] calculating an inverse tangent function value of the first ratio, and taking the inverse tangent function value as an eighth parameter measurement result of the first angle.

[0029] In one of the embodiments, the method further comprises:

[0030] determining a target measurement index; the target measurement index is any one of the measurement indexes; the measurement indexes 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;

[0031] obtaining a target offset value corresponding to the target measurement index;

[0032] calibrating a target parameter measurement result corresponding to the target measurement index by using the target offset value, to obtain an updated target parameter measurement result.

[0033] In one of the embodiments, the method further comprises:

[0034] obtaining a target standard parameter corresponding to the target measurement index;

[0035] calculating a difference between a target parameter measurement result of the target measurement index and the target standard parameter;

[0036] if the difference is greater than a preset difference threshold, determining that the display panel does not meet a preset standard.

[0037] In one of the embodiments, the obtaining of the target image comprises:

[0038] obtaining a target region image containing a target region in the display panel; the target region is a region where a graphical line corresponding to a measurement index is located; the graphical line includes the substrate, the pixel definition layer, and the isolation structure;

[0039] labeling a to-be-measured region corresponding to the graphical line in the target region image;

[0040] performing image processing on the to-be-measured region to obtain a target image.

[0041] In one of the embodiments, the performing of the image processing on the to-be-measured region to obtain a target image comprises:

[0042] for each pixel in the to-be-measured region, determining a gray scale value corresponding to each basic color channel of the pixel;

[0043] determining a gray scale value range corresponding to each basic color channel, and determining a target color channel according to the gray scale value ranges;

[0044] The boundary line is determined according to the distribution of the gray scale values of each target gray scale value in the target color channel in a preset direction, and the color partition is divided according to the boundary line to obtain a target image.

[0045] In one of the embodiments, the determination of the gray scale value range corresponding to each basic color channel and the determination of the target color channel according to each gray scale value range comprises:

[0046] For each basic color channel, the gray scale value contrast corresponding to the basic color channel is determined.

[0047] The basic color channel with the maximum gray scale value contrast is determined as the target color channel.

[0048] In one of the embodiments, if the edge of the graphic line is a straight line or a convex line, the determination of the boundary line according to the distribution of the gray scale values of each target gray scale value in the target color channel in a preset direction and the division of the color partition according to the boundary line to obtain a target image comprises:

[0049] The gray scale value variation of each target gray scale value in the target color channel in a measurement direction is determined, the boundary line is determined according to the region with the maximum gray scale value variation, and the color partition is divided according to the boundary line to obtain a target image.

[0050] In one of the embodiments, the determination of the gray scale value variation of each target gray scale value in the target color channel in a measurement direction, the determination of the boundary line according to the region with the maximum gray scale value variation, and the division of the color partition according to the boundary line to obtain a target image comprise:

[0051] A line graph is generated along the measurement direction for each target gray scale value in the target color channel; the horizontal axis of the line graph represents the pixel position along the measurement direction, and the vertical axis represents the gray scale value.

[0052] The region with the maximum gray scale value variation is determined based on the line graph, the boundary line is determined according to the region with the maximum gray scale value variation, and the color partition is divided according to the boundary line to obtain a target image.

[0053] In one of the embodiments, if the edge of the graphic line is a diagonal line, the determination of the boundary line according to the distribution of the gray scale values of each target gray scale value in the target color channel in a preset direction and the division of the color partition according to the boundary line to obtain a target image comprise:

[0054] The boundary line corresponding to the diagonal line is determined according to the distribution of the gray scale values of each target gray scale value in the target color channel in the direction of the diagonal line, and the color partition is divided according to the boundary line to obtain a target image.

[0055] In a second aspect, the present application provides a device for measuring a parameter of a display panel. The device comprises:

[0056] an image acquisition module, configured to take a photo of the display panel from a side of the pixel definition layer away from the substrate, and acquire a target image, wherein the target image comprises a plurality of boundary lines dividing a plurality of color partitions, the plurality of color partitions comprise a light emitting area corresponding to the pixel opening, and the plurality of boundary lines comprise a first boundary line surrounding the light emitting area and a second boundary line close to the first boundary line;

[0057] 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;

[0058] a parameter measurement result calculation module, configured to calculate a distance between the first coordinate and the second coordinate as a first parameter measurement result of the first line width.

[0059] In a third aspect, the present application provides a terminal device. The terminal device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the above method when executing the computer program.

[0060] In a fourth aspect, the present application provides a computer readable storage medium. The computer readable storage medium stores a computer program, and the computer program is executable on a processor to implement the steps of the above method.

[0061] In a fifth aspect, the present application provides a computer program product. The computer program product comprises a computer program, and the computer program is executable on a processor to implement the steps of the above method.

[0062] The embodiment of the present application provides a kind of method for measuring the parameter of display panel, in the method, display panel includes substrate and the pixel definition layer of being arranged to substrate side, pixel definition layer defines multiple pixel openings, and include the side wall towards pixel opening, the width of the orthographic projection of side wall on substrate is the first line width of display panel;By being photographed to display panel on the side of pixel definition layer away from substrate, obtain target image;Target image includes multiple boundary lines divided into multiple color partitions, multiple color partitions include the light-emitting region corresponding to pixel opening, and multiple boundary lines include the first boundary line surrounding light-emitting region and the second boundary line close to first boundary line;It also means that the structure of display panel can be determined according to each color partition and boundary line in target image, then the first coordinate corresponding to the first target point located on first boundary line is obtained, and the second coordinate corresponding to the second target point located on second boundary line and close to first target point;The first parameter measurement result of the first line width of display panel is determined according to the distance between the first target point on the first boundary line and the second target point on the second boundary line in target image.Therefore, the parameter measurement result of the measurement index of display panel can be accurately determined by the method.

[0063] It can be understood that the device for measuring the parameter of display panel, terminal equipment, computer readable storage medium and computer program product provided by the embodiment of the present application have the same beneficial effects as described above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0064] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of specific embodiments or prior art. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0065] Figure 1 A schematic diagram of a pixel structure is provided for the embodiment of the present application.

[0066] The label details involved in the above drawings are as follows:

[0067] 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;

[0068] Figure 2 A structural schematic diagram of a display panel is provided for the embodiment of the present application.

[0069] Figure 3 A flowchart of a method for measuring a parameter of a display panel according to an embodiment of the present application is provided.

[0070] Figure 4 A corresponding relationship diagram between a boundary line and a mask structure according to an embodiment of the present application is provided.

[0071] Figure 5 A process schematic diagram of photographing a target region according to an embodiment of the present application is provided.

[0072] Figure 6 A schematic diagram of a bump according to an embodiment of the present application is provided.

[0073] Figure 7 A structural schematic diagram of a device for measuring a parameter of a display panel according to an embodiment of the present application is provided.

[0074] Figure 8 A structural schematic diagram of a terminal device according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0075] Figure 1 A schematic diagram of a pixel structure according to an embodiment of the present application is provided. In the pixel structure, a metal mask (FMM) is replaced by a I-shaped structure to perform RGB patterning, so that each pixel point can be correctly aligned and form a required color pattern. By accurately controlling a mask structure, efficient RGB patterning can be achieved without the FMM.

[0076] In the preparation process of a display panel, some key measurement parameters need to be accurately measured and controlled, such as the line width of a pixel definition layer and the line width from a mask region to a VPDL, so as to ensure that the display performance of the finally produced display panel can meet the design requirements. At present, a CD (Critical Dimension) measurement device is generally used to measure two-dimensional sizes such as line width and pitch, but since the boundary points cannot be clearly determined, the parameter measurement result corresponding to the measurement parameter cannot be accurately determined.

[0077] The method for measuring a parameter of a display panel according to an embodiment of the present application can be executed by a processor of a terminal device when running a corresponding computer program.

[0078] Specifically, the terminal device in the embodiment can be a device containing image processing software in an AOI (Automatic Optical Inspection) station, and the image processing software can be EDA (Electronic Design Automation). The AOI system integrates a high-resolution camera, a light source, an optical lens, a terminal device, and a mechanical moving platform to realize rapid and accurate detection of a product.

[0079] Figure 2 A structural schematic diagram of a display panel is provided in the embodiment of the present application. As shown in the figure, Figure 2 In the embodiment, 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 a side wall facing the pixel openings. The width of the orthogonal projection of the side wall on the substrate is the first line width of the display panel.

[0080] Specifically, the display panel includes a substrate and a pixel definition layer (PDL) disposed on one side of the substrate. The substrate is the basic support structure of the display panel. The pixel definition layer defines a plurality of pixel openings through its structural design. The pixel opening is an opening reserved by the pixel definition layer, used to accommodate a light-emitting material (such as an organic light-emitting layer in OLED) or an area for controlling the arrangement of liquid crystal molecules, and is the core light-emitting part of the pixel area.

[0081] Each pixel opening corresponds to a pixel unit, and a plurality of pixel units are needed in the display panel to display an image. The pixel openings are isolated from each other to ensure that each pixel unit works independently; the plurality of pixel openings together constitute a complete display area.

[0082] The side wall refers to the edge portion of the pixel definition layer facing the pixel opening. The first line width of the display panel in the embodiment is the line width of the pixel definition layer, specifically the width of the orthogonal projection of the side wall of the pixel definition layer on the substrate. As shown in the figure, Figure 2 The orthogonal 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.

[0083] Figure 3 A flowchart of a method for measuring parameters of a display panel is provided in the embodiment of the present application. For ease of illustration, only the part related to the embodiment is shown, and the method provided in the embodiment includes the following steps:

[0084] S100: Taking a photo of the display panel on the side of the pixel definition layer away from the substrate and obtaining 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.

[0085] In this embodiment, a high-resolution camera is used to take a picture of the display panel on the side of the pixel definition layer away from the substrate to obtain the target image.

[0086] In the target image, there are multiple color zones, which are separated by boundary lines; different color zones represent different functional areas or structural features of the display panel, such as the light-emitting area corresponding to the pixel opening.

[0087] Figure 4 A diagram showing the correspondence between boundary lines and mask structures provided in this application embodiment; as shown Figure 4 As shown, multiple boundary lines surround the luminous area, including at least the first boundary line. and near the first boundary line And far from the second boundary line of the luminescent region Understandably, the first boundary line Second boundary line The distance between them is the width of the orthographic projection of the sidewall onto the substrate, i.e., the first linewidth.

[0088] S200: Obtain the first coordinates of the first target point located on the first boundary line, and the second coordinates of the second target point located on the second boundary line and close to the first target point.

[0089] Specifically, let's start with the first boundary line. The first target point is determined, and its corresponding first coordinates are obtained. Then, from the second boundary line... A second target point is determined, which is close to the first target point, and the second coordinates corresponding to the second target point are obtained. In this embodiment, from the second boundary line... When determining the second target point, the second boundary line can be used. The point closest to the first target point is designated as the second target point.

[0090] In practical applications, the first boundary line is determined according to actual needs. Select a pixel as the first target point; determine the pixel coordinates of the pixel in the target image, and use these pixel coordinates as the first coordinates of the first target point. Then, for the second boundary line... Traverse the second boundary line For all pixels on the target, calculate the distance between each pixel and the first target point, determine the pixel with the smallest distance as the second target point, and determine the second coordinates corresponding to the second target point.

[0091] S300: 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.

[0092] After the first coordinate and the second coordinate are determined, a distance between the first coordinate and the second coordinate can be determined by calculating a difference between the first coordinate and the second coordinate, and the distance is taken as the first parameter measurement result of the first line width.

[0093] In actual application, a first calculation formula of the first line width can be set in advance, and after the first coordinate and the second coordinate are determined, the first coordinate and the second coordinate are respectively input into the first calculation formula, and the first parameter measurement result of the first line width is output based on the first calculation formula. Figure 2 and Figure 4 As shown in FIGS. 1 and 2, the first parameter measurement result of the first line width = the first coordinate on the first boundary line - the second coordinate on the second boundary line. As shown in FIGS. 1 and 2, the first parameter measurement result of the first line width = the first coordinate on the first boundary line - the second coordinate on the second boundary line.

[0094] The method for measuring a parameter of a display panel provided in the embodiments of the present application, in the method, 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 a sidewall facing the pixel openings, a width of a normal projection of the sidewall on the substrate is a first line width of the display panel; a target image is obtained by taking a photo of the display panel on a side of the pixel definition layer away from the substrate; 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; it is indicated that the structure of the display panel can be determined according to each color partition and boundary line in the target image, then a first coordinate corresponding to a first target point located on the first boundary line is obtained, and a second coordinate corresponding to a second target point located on the second boundary line and close to the first target point is obtained; a first parameter measurement result of the first line width of the display panel is determined according to a distance between the first target point on the first boundary line and the second target point on the second boundary line. Therefore, the method can accurately determine the parameter measurement result of the measurement index of the display panel.

[0095] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in the embodiments, specifically, in the embodiments, the display panel further includes an isolation structure located on the side of the pixel definition layer away from the substrate, the isolation structure is enclosed to form a plurality of isolation openings, the isolation openings are communicated with the corresponding pixel openings, at the same isolation opening and the same pixel opening position in communication, a distance between an edge of a normal projection of the pixel definition layer on the substrate and an edge of a normal projection of the isolation structure on the substrate is 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:

[0096] a third coordinate corresponding to a third target point located on the third boundary line and close to the second target point is obtained.​

[0097] The distance between the third coordinate and the first coordinate is calculated as a second parameter measurement result of the second line width.

[0098] In the embodiment, the display panel further comprises an isolation structure on the side of the pixel definition layer away from the substrate; the isolation structure encloses an isolation opening; and the isolation structure is used to isolate different pixel units. The isolation opening is in communication with the corresponding pixel opening; that is, the isolation opening and the pixel opening are in communication and become the same opening.

[0099] The second line width in the embodiment refers to the line width (MVP) of the mask area to the VPDL. As shown in Figure 2 , at the same isolation opening and the same pixel opening in communication, the edge corresponding position F of the orthographic projection of the pixel definition layer on the substrate, the edge corresponding position D of the orthographic projection of the isolation structure on the substrate, and the distance between the position F and the position D is the second line width of the display panel.

[0100] Corresponding to the target image, the plurality of boundary lines further comprises a third boundary line located on the side of the second boundary line away from the first boundary line. The third boundary line is located on the side of the second boundary line away from the first boundary line. The third boundary line is located on the side of the second boundary line away from the first boundary line. As shown in Figure 4 , the third boundary line is located on the side of the second boundary line away from the first boundary line. The third boundary line is located on the side of the second boundary line away from the first boundary line. The third boundary line is located on the side of the second boundary line away from the first boundary line. The first boundary line, the second boundary line, and the third boundary line are sequentially arranged in the direction gradually away from the light-emitting area. In the embodiment, a third target point is determined on the third boundary line, and a third coordinate corresponding to the third target point is obtained; wherein the point on the third boundary line closest to the second target point is taken 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.

[0101] In actual application, a second calculation formula of the second line width can be set in advance, and after the first coordinate and the third coordinate are determined, 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. As shown in and , the second parameter measurement result corresponding to the second line width = the first coordinate on the first boundary line - the second coordinate on the third boundary line.

[0102] Figure 2 Figure 4

[0103] ​​​​​​​The method described in this embodiment can efficiently and conveniently determine the measurement result of the second parameter corresponding to the second line width of the display panel.

[0104] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Specifically, in this embodiment, the isolation structure includes a first layer and a second layer stacked sequentially along the direction away from the substrate. The orthographic projection of the side of the first layer near 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 the edge of the orthographic projection of the side of the first layer near the second layer on the substrate and the edge of the orthographic projection of the second layer on the substrate is the third linewidth of the display panel. The multiple boundary lines also include a fourth boundary line located on the side of the third boundary line away from the first boundary line and a fifth boundary line located on the side of the fourth boundary line away from the first boundary line. The method further includes:

[0105] Obtain the fourth coordinates of the fourth target point located on the fifth boundary line and close to the third target point;

[0106] Calculate the distance between the fourth and third coordinates, and use it as the third parameter measurement result for the third line width.

[0107] like Figure 2 As shown, in this embodiment, the isolation structure includes a first layer and a second layer, which are stacked sequentially along the 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.

[0108] In this embodiment, the third linewidth of the display panel is the linewidth of the mask area, specifically the distance between the edge of the orthographic projection of the first layer (closer to the second layer) onto the substrate and the edge of the orthographic projection of the second layer onto the substrate. Specifically, position B corresponds to the edge of the orthographic projection of the first layer (closer to the second layer) onto the substrate, and position D corresponds to the edge of the orthographic projection of the second layer onto the substrate. The distance between positions B and D is the third linewidth of the display panel.

[0109] In the target image, the multiple boundary lines also include the third boundary line. Far from the first boundary line Fourth boundary line on one side and located on the fourth boundary line Far from the first boundary line The fifth boundary line on one side Combining Figure 4 As shown, the fourth boundary line The third boundary line is located on the side away from the first boundary line The fourth boundary line is located on the side away from the first boundary line The fifth boundary line is located on the side away from the first boundary line The fourth boundary line is located on the side away from the first boundary line The fourth boundary line is located on the side away from the first boundary line The third boundary line, the fourth boundary line, and the fifth boundary line are sequentially arranged in a direction gradually away from the light-emitting region.

[0110] In this embodiment, the fourth coordinate point is determined on the fifth boundary line , and a fourth coordinate corresponding to the fourth coordinate point is obtained; wherein the point on the fifth boundary line closest to the third target point is taken 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.

[0111] In actual application, a third calculation formula of the third line width can be set in advance, and after the third coordinate and the fourth coordinate are determined, 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. As shown in Figure 2 and Figure 4 , the third parameter measurement result corresponding to the third line width = the third coordinate on the third boundary line - the fourth coordinate on the fifth boundary line .

[0112] According to the method of this embodiment, the third parameter measurement result corresponding to the third line width of the display panel can be efficiently and conveniently determined.

[0113] In some embodiments, the isolation structure further includes a third layer, the third layer is located on the 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 protrudes from the side wall of the first layer.

[0114] In some embodiments, the cathode of the light-emitting device is overlapped with the third layer.

[0115] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in this embodiment, 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 direction of the isolation opening is the fourth line width of the display panel; the plurality of boundary lines further includes a sixth boundary line located on the side away from the first boundary line of the fifth boundary line; the method further includes:

[0116] obtaining a fifth coordinate corresponding to a fifth coordinate point located on the sixth boundary line and close to the fourth coordinate point;​​​

[0117] The distance between the fourth coordinate and the fifth coordinate is calculated as the fourth parameter measurement result of the fourth line width.

[0118] In combination with Figure 2 It is shown that the fourth line width of the display panel in the embodiment corresponds to the line width of the anode overlap area of the display panel. Specifically, the edge of the orthographic projection of the first layer of the isolation structure on the side close to the second layer corresponds to position B on the substrate, and the edge of the substrate in the opposite direction of the isolation opening corresponds to position A; the distance between position A and position B is the fourth line width of the display panel.

[0119] In the target image, the plurality of boundary lines further include a sixth boundary line located on the side of the fifth boundary line away from the first boundary line. In combination with Figure 4 It is shown that the sixth boundary line is located on the side of the fifth boundary line away from the first boundary line , that is, the fourth boundary line , the fifth boundary line and the sixth boundary line are sequentially arranged in the direction gradually away from the light-emitting area.

[0120] In the embodiment, a fifth coordinate point is determined on the sixth boundary line, and a fifth coordinate corresponding to the fifth coordinate point is obtained; wherein the point on the sixth boundary line closest to the fourth target point is taken as the fifth target point. Then, the distance between the fourth coordinate and the fifth coordinate is calculated, and the distance is determined as the fourth parameter measurement result of the fourth line width.

[0121] In actual application, a fourth calculation formula of the fourth line width can be set in advance, and after the fourth coordinate and the fifth coordinate are determined, the fourth coordinate and the fifth coordinate are respectively input into the fourth calculation formula, and the fourth parameter measurement result of the fourth line width is output based on the fourth calculation formula. In combination with Figure 2 and Figure 4 It is shown that the fourth parameter measurement result corresponding to the fourth line width = the fourth coordinate on the fifth boundary line - the fifth coordinate on the sixth boundary line .

[0122] According to the method of the embodiment, the fourth parameter measurement result corresponding to the fourth line width of the display panel can be efficiently and conveniently determined.

[0123] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in the embodiment, and specifically, in the 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 direction of the isolation opening is the fifth line width of the display panel; the method further comprises:

[0124] The distance between the third coordinate and the fifth coordinate is calculated as the fifth parameter measurement result of the fifth line width.

[0125] 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 direction of the isolation port. As shown in Figure 2 , 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 direction of the isolation port 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 (MA) and the line width of the anode overlap area (AnodeOverlap), that is, MA+AnodeOverlap.

[0126] As shown in Figure 4 , in this embodiment, the fifth target point is determined on the sixth boundary line , and the distance between the fifth target point on the sixth boundary line and the third target point on the third boundary line is calculated, and 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.

[0127] In actual application, after the third parameter measurement result of the third line width and the fourth parameter measurement result of the fourth line width are calculated respectively, 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 is determined as the fifth parameter measurement result of the fifth line width.

[0128] In actual application, the fifth calculation formula of the fifth line width can be set in advance, and after the third coordinate and the fifth coordinate are determined, the third coordinate and the fifth coordinate are 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.

[0129] In this embodiment, as shown in Figure 2 and Figure 4 , the fifth line width = fourth line width + third line width, that is, (fourth coordinate on the fifth boundary line -fifth coordinate on the sixth boundary line )+(third coordinate on the third boundary line -fourth coordinate on the fifth boundary line )=third coordinate on the third boundary line -fifth coordinate on the sixth boundary line .

[0130] According to the method of this embodiment, the fifth parameter measurement result corresponding to the fifth line width of the display panel can be efficiently and conveniently determined.

[0131] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in the embodiments. Specifically, in the embodiments, the distance between the edge of the orthogonal projection of the pixel definition layer on the substrate and the edge of the substrate away from the direction of the isolation opening is the sixth line width of the display panel; the method further comprises:

[0132] The distance between the first coordinate and the fifth coordinate is calculated as the sixth parameter measurement result of the sixth line width.

[0133] The sixth line width of the display panel in the embodiments is the distance between the edge of the orthogonal projection of the pixel definition layer on the substrate and the edge of the substrate away from the direction of the isolation opening. As shown in Figure 2 , the edge of the orthogonal projection of the pixel definition layer on the substrate is position F, and the edge of the substrate away from the direction of 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).

[0134] As shown in Figure 4 , in the embodiments, 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.

[0135] In actual applications, after 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 are calculated, 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 is calculated, and the calculation result is determined as the sixth parameter measurement result of the sixth line width.

[0136] In the embodiments, as shown in Figure 2 and Figure 5 , the sixth line width = the second line width + the third line width + the fourth line width, that is, (the third coordinate on the third boundary line - the fourth coordinate on the fifth boundary line ) + (the fourth coordinate on the fifth boundary line - the fifth coordinate on the sixth boundary line ) + (the first coordinate on the first boundary line - the second coordinate on the third boundary line ) = the first coordinate on the first boundary line - the fifth coordinate on the sixth boundary line .

[0137] In actual application, a sixth calculation formula of the sixth line width can be set in advance, and after the first coordinate and the fifth coordinate are determined, the first coordinate and the fifth coordinate are respectively input into the sixth calculation formula, and a sixth parameter measurement result of the sixth line width is output based on the sixth calculation formula.

[0138] According to the method of the embodiment, the sixth parameter measurement result corresponding to the sixth line width of the display panel can be efficiently and conveniently determined.

[0139] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in the embodiment, and specifically, in the embodiment, the method further comprises:

[0140] calculating a difference between the first parameter measurement result of the first line width and the second parameter measurement result of the second line width, and taking the difference as a seventh parameter measurement result of a seventh line width.

[0141] The seventh line width in the 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).

[0142] Specifically, after the first parameter measurement result of the first line width and the second parameter measurement result of the second line width are calculated, a 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.

[0143] According to the method of the embodiment, the seventh parameter measurement result corresponding to the seventh line width of the display panel can be efficiently and conveniently determined.

[0144] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in the embodiment, and specifically, in the embodiment, the included angle between the side wall and the side of the pixel definition layer close to the substrate is a first angle of the display panel, and the method further comprises:

[0145] obtaining a thickness of the pixel definition layer as an eighth parameter measurement result of an eighth line width of the display panel;

[0146] calculating a first ratio between the eighth parameter measurement result and the first parameter measurement result;

[0147] calculating an inverse tangent function value of the first ratio as a ninth parameter measurement result of the first angle.

[0148] Reference Figure 5The first angle in the embodiment is the angle of the pixel definition layer (PDL angle), specifically, the included angle between the sidewall of the pixel definition layer and the side of the pixel definition layer close to the substrate. In the embodiment, the first angle of the display panel is determined according to the thickness of the pixel definition layer and the first line width. Specifically, the thickness of the pixel definition layer is obtained by pre-station RS sampling data, and the eighth parameter measurement result of the eighth line width is measured as the eighth parameter measurement result of the eighth line width.

[0149] Then, according to 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, and 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.

[0150] In actual application, the seventh calculation formula of the first angle can be preset, and after the first parameter measurement result of the first line width and the eighth parameter measurement result of the eighth line width are determined, the first parameter measurement result and the eighth parameter measurement result are input into the seventh calculation formula, and the ninth parameter measurement result of the first angle is output based on the seventh calculation formula.

[0151] In the embodiment, the seventh calculation formula is:

[0152] 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.

[0153] It should be noted that the prior art scheme cannot directly measure the first angle of the display panel, and according to the method of the embodiment, the fifth parameter measurement result of the first angle of the display panel can be efficiently and accurately calculated.

[0154] On the basis of the above-mentioned embodiments, the technical scheme is further described and optimized in the embodiment, specifically, in the embodiment, the method further comprises:

[0155] determining a target measurement index; the target measurement index is any one of the measurement indexes; the measurement indexes 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;

[0156] determining a target offset value corresponding to the target measurement index;

[0157] calibrating the target parameter measurement result corresponding to the target measurement index by using the target offset value to obtain an updated target parameter measurement result.

[0158] The offset value is a system deviation of the measuring device, that is, an inherent deviation between an actual measurement value and a design value measured by the measuring device. Generally, different measuring devices have different offset values for the same measurement index, and the same measuring device has different offset values for different measurement indexes.

[0159] In this embodiment, a target measurement index is first determined from a plurality of measurement indexes. The measurement indexes 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.

[0160] A target offset value corresponding to the target measurement index for the measuring device is then 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.

[0161] In one specific example, the target parameter measurement result is calibrated using the target offset value, which can be subtracted from the target parameter measurement result to obtain the updated target parameter measurement result.

[0162] It should be noted that the specific correspondence between the measurement index and the offset value is not limited in this embodiment. Table 1 is a correspondence table between different measurement indexes and offset values provided by the present application.

[0163] Table 1: Correspondence table between different measurement indexes and offset values

[0164]

[0165] As shown in Table 1, assuming that the target measurement index is the fifth line width, the fifth parameter measurement result corresponding to the target measurement index is X μm, and the target offset value offset of the measuring device for the target measurement index (the fifth line width) is -0.3 μm, the fifth parameter measurement result of the fifth line width needs to be calibrated using the target offset value to obtain the updated fifth parameter measurement result. Specifically, 0.3 μm is subtracted from the calculated fifth parameter measurement result of the fifth line width to obtain the updated fifth parameter measurement result of (X-0.3) μm.

[0166] According to the method of this embodiment, the offset value of the measuring device is used to further correct the parameter measurement result, thereby improving the accuracy of the updated parameter measurement result.

[0167] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in this embodiment. Specifically, in this embodiment, the method further includes:

[0168] obtaining a target standard parameter corresponding to the target measurement index;

[0169] calculating a difference between the target parameter measurement result of the target measurement index and the target standard parameter;

[0170] If the difference is greater than a preset difference threshold, it is determined that the display panel does not meet the preset standard.

[0171] In this embodiment, after obtaining the target parameter measurement result corresponding to the target measurement index, the target standard parameter corresponding to the target measurement index is obtained, and then the target parameter measurement result and the target standard parameter are compared to calculate the difference between the target parameter measurement result of the target measurement index and the target standard parameter.

[0172] The calculated difference is 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.

[0173] 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 target measurement index. 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, if 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.

[0174] According to the method of this embodiment, it can be determined whether the display panel meets the preset standard efficiently and directly.

[0175] Based on the above embodiments, the technical solutions are further described and optimized in this embodiment. Specifically, in this embodiment, the target image is obtained, including:

[0176] Step 1: Obtain a target region image containing a target region in the display panel; the target region is a region where a graphic circuit corresponding to the measurement index is located; the graphic circuit includes a substrate, a pixel definition layer and an isolation structure.

[0177] In the process of manufacturing the display panel, the pixel definition layer needs to be peeled off after it completes its function. Since the structure after peeling off can directly reflect the quality of the pixelization process, this embodiment can obtain a target region image containing a target region in the display panel after the pixel definition layer is peeled off, to measure the parameters of the display panel.

[0178] Specifically, the magnification of the Automatic Optical Inspection (AOI) or Repair (REP) equipment is set, and a high-magnification lens is used to photograph the area containing the graphic lines of the display panel based on the set magnification, obtaining a high-resolution image of the target area. The graphic lines include the substrate, pixel definition layer, and isolation structure.

[0179] After capturing an image of the target area, the automated optical inspection or repair equipment uploads the image to the DFS (Data File Server); the terminal device then retrieves the image of the target area from the DFS server.

[0180] Figure 6 This is a schematic diagram illustrating the process of capturing an image of a target area, as provided in an embodiment of this application. (In conjunction with...) Figure 7 As shown, in a specific embodiment, the shooting parameters are first set: the detection points (InitialPoint) are set according to the graphic line, such as coordinates (x, y), that is, the position of fixed-point shooting is determined; the spacing between detection points (Gap) is set, including horizontal spacing and vertical spacing, and the rows and columns are adjusted to adjust the size of the shooting range; the magnification is adjusted to set the magnification, which is generally set to 10; after completing the shooting parameter settings, the AOI device is used to shoot each detection point according to the layout defined in the array diagram to obtain the target area image.

[0181] In addition, when determining the inspection points, the product coordinates of the graphic circuit are converted into the mechanical coordinates of the imaging device, and the location for fixed-point photography is determined according to the mechanical coordinates, thus determining the inspection points. When there are a large number of inspection points, they can be pre-entered into a table document and then imported into the imaging device.

[0182] In the manufacturing processes 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 patterned circuitry also includes bumps, and the measurement parameters include key dimensions of the bumps, such as height, width, and spacing.

[0183] In practical applications, when using automated optical inspection equipment to capture images of the target area, the time required to complete the measurement is directly proportional to the number of images of the target area captured. Therefore, the number of target area images cannot be increased indefinitely. In order to achieve the initial inspection objectives while avoiding excessively long production time (tact time) for a single product, after completing the initial inspection objectives, some image capture tasks for points that no longer need to be inspected will be deleted to optimize the inspection process and improve efficiency.

[0184] Step 2: Label the to-be-measured region corresponding to the graphic line in the target region image.

[0185] Specifically, the measurement position information corresponding to the graphic line of the display panel can be acquired according to the design and process requirements of the display panel, and the to-be-measured region corresponding to the measurement position information can be labeled in the target region image. In addition, the to-be-measured region corresponding to the graphic line can also be labeled in the target region image according to a preset mark (such as an alignment Mark).

[0186] It should be noted that the to-be-measured region corresponding to the graphic line can be marked by a red frame or a line to mark the position of the line width, and the to-be-measured region is obtained. The labeling method is not limited in this embodiment.

[0187] In a specific example, if the edge of the graphic line is convex, the process of determining the to-be-measured region is as follows in combination with a convex point schematic diagram shown in FIG. 3: Figure 7

[0188] The pre-set convex point position to be photographed is acquired; the convex point position is photographed based on the convex point position: the convex point position is photographed by using a high magnification lens of an automatic optical detection device to obtain a high-resolution image of the convex point position, that is, a target region image; and the to-be-measured region corresponding to the measurement position information is labeled in the target region image based on a pre-set convex-shaped mark (Mark), so as to clearly observe the characteristics of the convex point.

[0189] Step 3: Image processing is performed on the to-be-measured region to obtain a target image.

[0190] After the to-be-measured region is determined, image processing is performed on the to-be-measured region, including grayscale processing, to obtain a target image; the target image includes a plurality of structure layers, and each structure layer is used to identify each graphic line in the display panel.

[0191] According to the method of this embodiment, the target region image containing the target region of the display panel is acquired, and then the to-be-measured region corresponding to the graphic line is labeled in the target region image, so that the to-be-measured region of the graphic line in the display panel can be quickly determined, that is, the to-be-measured region of the graphic line is accurately locked to determine the target image, and the efficiency of parameter measurement on the display panel is improved.

[0192] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in this embodiment. Specifically, in this embodiment, the target image is obtained by performing image processing on the to-be-measured region, including:

[0193] For each pixel in the to-be-measured region, the gray scale value corresponding to each basic color channel of the pixel is determined; ​

[0194] determine a target color channel according to the gray scale value range of each basic color channel;

[0195] determine a boundary line according to the gray scale value distribution of each target gray scale value in the target color channel in a preset direction, and divide a color partition according to the boundary line to obtain a target image.

[0196] Specifically, after the to-be-measured region is determined, the target region image is converted into R (red), G (green), and B (blue) data. Specifically, for each pixel point in the to-be-measured region, the color information of the pixel point is decomposed into the gray scale values of the three basic color channels of R (red), G (green), and B (blue); the range of the gray scale values of the basic color channels is 0-255.

[0197] Then, for each basic color channel, the gray scale value range of the gray scale values in the basic color channel is determined, and the gray scale value contrast is further determined. Specifically, the difference between the maximum gray scale value and the minimum gray scale value in the basic color channel is calculated, and the difference represents the gray scale value contrast of each gray scale value in the basic color channel, that is, the gray scale value contrast = the maximum gray scale value in the basic color channel - the minimum gray scale value.

[0198] The gray scale value contrasts corresponding to each basic color channel are compared, and the basic color channel with the maximum gray scale value contrast is determined as the target color channel. For example, if the gray scale value contrast corresponding to each gray scale value in the green channel is the maximum, the green channel is taken as the target color channel.

[0199] In one specific embodiment, the gray scale value range corresponding to each basic color channel is determined, and the target color channel is determined according to the gray scale value range of each basic color channel, including:

[0200] For each basic color channel, the gray scale value contrast corresponding to the basic color channel is determined;

[0201] The basic color channel with the maximum gray scale value contrast is determined as the target color channel.

[0202] It should be noted that different basic color channels exhibit different edges of the convex point, and therefore, the basic color channel with high gray scale contrast is selected as the analysis reference, that is, the basic color channel with the maximum gray scale value contrast is determined as the target color channel of the measurement index for measuring the convex point.

[0203] After the target color channel is determined, a corresponding boundary line is determined according to the gray scale value distribution of each target gray scale value in the target color channel in a preset direction, and a plurality of boundary lines correspond to division of a corresponding color partition, so that the target image is obtained. The target gray scale value is the gray scale value corresponding to the target color channel. The preset direction can be a measurement direction, and the measurement direction includes a horizontal direction and a vertical direction.

[0204] According to the method of the embodiment, by determining the target color channel, determining the boundary line according to the gray scale value distribution of each target gray scale value in the target color channel in the preset direction, and dividing the color partition according to the boundary line, the target image is obtained, so that the edge position of the graphic line can be more easily identified, and therefore the accuracy and convenience of parameter measurement of the display panel can be improved.

[0205] On the basis of the above-mentioned embodiments, the technical solutions are further described and optimized in the embodiment, and specifically,

[0206] If the edge of the graphic line is a straight line or a convex, the boundary line is determined according to the gray scale value distribution of each target gray scale value in the target color channel in the preset direction, and the color partition is divided according to the boundary line, and the target image is obtained, including:

[0207] The gray scale value variation of each target gray scale value in the target color channel in the measurement direction is determined, the boundary line is determined according to the region with the largest gray scale value variation, and the color partition is divided according to the boundary line, and the target image is obtained.

[0208] The gray scale value variation of the gray scale value in the measurement direction refers to the size change of the gray scale value along the measurement direction.

[0209] Specifically, the core of determining the boundary line is to identify the region with the most significant gray scale value variation in the to-be-measured region, that is, the region with the most significant gray scale value variation is generally the edge of the graphic line; in the target image, the region with the most significant gray scale value variation is also the boundary line of the color partition.

[0210] Therefore, after the target gray scale value corresponding to the target color channel is determined, each target gray scale value is arranged along the pixel measurement direction to obtain a one-dimensional target gray scale value; the target gray scale value is differentiated (first derivative) to determine the brightness variation of the target gray scale value, that is, the gray scale value variation of the target gray scale value in the preset direction is obtained. In addition, the difference between adjacent target gray scale values can also be calculated to determine the gray scale value variation of the target gray scale value.

[0211] After determining the gray scale value variation amount of each target gray scale value in the target color channel in the measurement direction, a target gray scale value with the largest luminance variation of the gray scale values is determined, that is, a local maximum value and a local minimum value are determined; a boundary line is determined according to the local maximum value and the local minimum value, and the multiple boundary lines divide the target image into multiple color partitions.

[0212] According to the method of the embodiment, the boundary line can be efficiently and accurately determined from the target image, and the color partitions can be divided according to the boundary line, and the parameter measurement result corresponding to the measurement index can be efficiently and accurately determined based on the target image subsequently.

[0213] Based on the above-mentioned embodiments, the technical solutions are further described and optimized in the embodiment, specifically, in the embodiment, the gray scale value variation amount of each target gray scale value in the target color channel in the measurement direction is determined, and the structure layering is determined according to the region with the largest gray scale value variation amount, and the target image is obtained, including:

[0214] A line graph is generated along the measurement direction for each target gray scale value in the target color channel; the horizontal axis in the line graph represents the pixel point position corresponding to the measurement direction, and the vertical axis represents the gray scale value;

[0215] The region with the largest gray scale value variation amount is determined based on the line graph, the boundary line is determined according to the region with the largest gray scale value variation amount, and the color partitions are divided according to the boundary line, and the target image is obtained.

[0216] The measurement direction includes a horizontal direction and a vertical direction.

[0217] In a specific embodiment, the target gray scale value corresponding to the target color channel is determined first, and then a line graph is generated along the measurement direction for each target gray scale value. For example, if the measurement direction is the horizontal direction, the horizontal axis in the line graph represents the pixel point position of each pixel point distributed along the horizontal direction, and the vertical axis represents the gray scale value.

[0218] It can be understood that the core of determining the boundary line is to identify the region with the most significant gray scale value variation in the to-be-measured region, and therefore, the boundary line can be determined according to the peak point position and the valley point position in the line graph after the line graph is determined. In addition, the differential value of the gray scale curve corresponding to each pixel point can be calculated based on the line graph, and the maximum value and the minimum value of the differential value are determined as the boundary line, and then multiple color partitions are divided according to the boundary line.

[0219] It should be noted that when calculating the parameter measurement result corresponding to the measurement index, the parameter measurement result of the measurement index can be determined according to the pixel interval width between the corresponding peak point and the valley point.

[0220] According to the method of the embodiment, the boundary line of the graphic line can be accurately determined, and the color partition can be divided according to the boundary line, and the parameter measurement result corresponding to the measurement index can be accurately determined based on the target image.

[0221] If the edge of the graphic line is a slant line, the differential method cannot be directly used to accurately identify the edge position of the slant line because the gray scale change direction of the slant line is inconsistent with the horizontal direction or the vertical direction. Therefore, based on the above embodiment, the technical solution is further described and optimized in the embodiment. Specifically, in the embodiment, if the edge of the graphic line is a slant line, the boundary line is determined according to the gray scale value distribution of each target gray scale value in the target color channel in a preset direction, and the color partition is divided according to the boundary line to obtain a target image, including:

[0222] The boundary line corresponding to the slant line is determined according to the gray scale value distribution of each target gray scale value in the target color channel in the slant line direction, and the color partition is divided according to the boundary line to obtain a target image.

[0223] It should be noted that if the edge of the graphic line is a slant line, the measurement can be performed in a tilted state. The measurement direction is adjusted by rotating the image or adjusting the direction of the edge detection algorithm to be consistent with the direction of the slant line.

[0224] In addition, the gray scale value distribution of each target gray scale value in the target color channel in the slant line direction can be analyzed along the slant line direction to find the maximum value point and the minimum value point of the target gray scale value along the slant line direction, the boundary line corresponding to the slant line is determined according to the maximum value point and the minimum value point, and the color partition is divided according to the boundary line to determine the target image. The specific value of the maximum value point or the minimum value point is not limited in the embodiment.

[0225] In actual application, a plurality of target area images in a preset time period can be obtained, and the maximum value point and the minimum value point of the target gray scale value are determined for each target area image; the average value of the maximum value points corresponding to the plurality of target area images and the average value of the minimum value points corresponding to the plurality of target area images are determined as the boundary line, and the corresponding color partition is divided according to the boundary line, so that the accuracy of determining the boundary line corresponding to the slant line can be improved.

[0226] According to the method of the embodiment, the boundary line can be accurately determined when the edge of the graphic line is a slant line, and the color partition can be divided.

[0227] It should be noted that, according to the method of the embodiment, the target area image of the AMOLED using the ViP technology is obtained by the AOI device, the FIB (Focused Ion Beam) slicing measurement technology is used for analysis, the parameter measurement result of the measurement index is determined, and the RS (review) measurement is performed; and the method can effectively improve the pixel dark spot problem caused by the CVD1 package suspension and fracture.

[0228] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0229] It should be noted that the information collection process (such as the face image collection process, the fingerprint information collection process, etc.) / feature extraction process involved in the present application is executed with the user's knowledge and permission, that is, the information collection process / feature extraction process meets the legal and regulatory requirements and does not belong to the act of obstructing public interests.

[0230] Figure 8 Fig. 1 shows a structure schematic diagram of a device for measuring a parameter of a display panel provided by an embodiment of the present application. 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 a sidewall facing the pixel openings. A width of a normal projection of the sidewall on the substrate is a first line width of the display panel. Figure 8 Fig. 1 shows a structure schematic diagram of a device for measuring a parameter of a display panel provided by an embodiment of the present application. 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 a sidewall facing the pixel openings. A width of a normal projection of the sidewall on the substrate is a first line width of the display panel.

[0231] The image acquisition module 710 is configured to take a photo of the display panel on the side of the pixel definition layer away from the substrate and acquire a target image. 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. 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.

[0232] The coordinate acquisition module 720 is 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.

[0233] The parameter measurement result calculation module 730 is configured to calculate a distance between the first coordinate and the second coordinate as a first parameter measurement result of the first line width.

[0234] The device for measuring a parameter of a display panel provided by the embodiment of the present application has the same beneficial effects as the method for measuring a parameter of a display panel.

[0235] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0236] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0237] Figure 8 This is a schematic diagram of the structure of a terminal device provided in an embodiment of this application. ​ 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, it implements the steps in the method embodiment for measuring the parameters of the various measurement display panels; or when the processor 802 executes the computer program 803, it implements the functions of each module / unit in the various device embodiments.

[0238] For example, computer program 803 can be divided into one or more modules / units, one or more of which are stored in memory 801 and executed by processor 802 to implement the method of the embodiments of this application. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 803 in terminal device 800. For example, computer program 803 can be divided into multiple modules, each with the following specific functions:

[0239] The image acquisition module is used to take a picture of the display panel on the side of the pixel definition layer away from the substrate and acquire a target image. The target image includes multiple boundary lines that divide multiple color partitions. The multiple color partitions include light-emitting areas corresponding to pixel openings. The multiple boundary lines include a first boundary line surrounding the light-emitting area and a second boundary line close to the first boundary line.

[0240] The coordinate acquisition module is 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;

[0241] The parameter measurement result calculation module is configured to calculate a distance between the first coordinate and the second coordinate as a first parameter measurement result of the first line width.

[0242] In applications, the terminal device 800 can be a desktop computer, a notebook computer, a palm computer, a cloud server, and the like. The terminal device 800 can include but is not limited to a memory 801 and a processor 802. Those skilled in the art can understand that the terminal device 800 can include more or fewer components than those shown in the figure, or combine certain components, or include different components, for example, the terminal device can also include an input / output device, a network access device, a bus, and the like; the input / output device can include a camera, an audio acquisition / player device, a display screen, and the like; the network access device can include a communication module for wireless communication with external devices. ​ The terminal device shown in the figure is merely an example and does not constitute a limitation on the terminal device, and can include more or fewer components than those shown in the figure, or combine certain components, or different components, for example, the terminal device can also include an input / output device, a network access device, a bus, and the like; the input / output device can include a camera, an audio acquisition / player device, a display screen, and the like; the network access device can include a communication module for wireless communication with external devices.

[0243] In applications, the processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, and the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0244] In applications, the memory can be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device; or an external storage device of the terminal device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, and the like; or both an internal storage unit and an external storage device of the terminal device. The memory is used to store an operating system, application programs, a boot loader, data, and other programs, such as program codes of computer programs, and the like. The memory can also be used to temporarily store data that has been output or will be output.

[0245] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to realize the steps in the above-mentioned various method embodiments.

[0246] The embodiment of the present application realizes all or part of the processes in the above-mentioned method embodiments, which can be completed by a computer program instructing related hardware. The computer program can be stored in a computer readable storage medium. When the computer program is executed by a processor, the steps in the above-mentioned various method embodiments can be realized. The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms. The computer readable medium at least includes any entity or device capable of carrying the computer program code to a terminal device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. For example, U disk, mobile hard disk, magnetic disk or optical disk and the like.

[0247] The embodiment of the present application provides a computer readable storage medium, which has the same beneficial effects as the above-mentioned method of measuring parameters of a display panel.

[0248] The embodiment of the present application further provides a computer program product, which includes a computer program. The computer program is executed by a processor to realize the steps in the above-mentioned various method embodiments.

[0249] The embodiment of the present application provides a computer program product, which has the same beneficial effects as the above-mentioned method of measuring parameters of a display panel.

[0250] In the above-mentioned embodiments, the description of each embodiment has its own focus. The parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0251] Those skilled in the art can realize that the devices and algorithm steps of the examples described in combination with the embodiments disclosed in the present application can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized by hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0252] In the embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other manners. For example, the embodiments of the device described above are merely schematic, and the mutual coupling or direct coupling or communication connection between the shown or discussed elements can be indirect coupling or communication connection through some interfaces; the indirect coupling or communication connection between the elements can be in electrical, mechanical or other forms.

[0253] The above descriptions are merely used to illustrate the technical solutions of the present application, rather than limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent replacements to some of the technical features; and the modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method of measuring a parameter of a display panel, characterized by, 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 a sidewall facing the pixel openings, a width of a projection of the sidewall on the substrate is a first line width of the display panel, and the method comprises: photographing the display panel from a side of the pixel definition layer away from the substrate and obtaining a target image, wherein the target image comprises a to-be-measured region, and the target image comprises a plurality of boundary lines dividing a plurality of color partitions, the plurality of color partitions comprise a light-emitting region corresponding to the pixel openings, the plurality of boundary lines comprise a first boundary line surrounding the light-emitting region and a second boundary line close to the first boundary line; the process of determining the boundary line comprises: for each pixel in the to-be-measured region, determining a gray scale value corresponding to each basic color channel of the pixel; determining a gray scale value range corresponding to each basic color channel, and determining a target color channel according to each gray scale value range; determining the boundary line according to the gray scale value distribution of each target gray scale value in the target color channel in a preset direction; 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; calculating a distance between the first coordinate and the second coordinate as a first parameter measurement result of the first line width.

2. The method of claim 1, wherein, The display panel further comprises an isolation structure located on a side of the pixel definition layer away from the substrate, the isolation structure encloses a plurality of isolation openings, the isolation openings are in communication with corresponding pixel openings, and at a position of the same isolation opening and the same pixel opening in communication, a distance between an edge of a projection of the pixel definition layer on the substrate and an edge of a projection of the isolation structure on the substrate is a second line width of the display panel, and the plurality of boundary lines further comprise a third boundary line located on a side of the second boundary line away from the first boundary line, and the method further comprises: obtaining a third coordinate corresponding to a third target point located on the third boundary line and close to the second target point; calculating a distance between the third coordinate and the first coordinate as a second parameter measurement result of the second line width.

3. The method of claim 2, wherein, The isolation structure comprises a first layer and a second layer arranged in a stacked manner in a direction away from the substrate, a projection of a side of the first layer close to the second layer on the substrate is located within a projection of the second layer on the substrate, and at a position of the same isolation opening, a distance between an edge of the projection of the side of the first layer close to the second layer on the substrate and an edge of the projection of the second layer on the substrate is a third line width of the display panel, the plurality of boundary lines further comprise 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 comprises: obtaining a fourth coordinate corresponding to a fourth target point located on the fifth boundary line and close to the third target point; calculating a distance between the fourth coordinate and the third coordinate as a third parameter measurement result of the third line width.

4. The method of claim 3, wherein, A distance between an edge of a normal projection of the first layer on the substrate close to the second layer and an edge of the substrate away from a direction of the isolation opening is 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; the method further includes: obtaining a fifth coordinate corresponding to a fifth target point located on the sixth boundary line and close to the fourth target point; calculating a distance between the fourth coordinate and the fifth coordinate as a fourth parameter measurement result of the fourth line width.

5. The method of claim 4, wherein, A distance between an edge of a normal projection of the second layer on the substrate and an edge of the substrate away from the direction of the isolation opening is a fifth line width of the display panel; the method further includes: calculating a distance between the third coordinate and the fifth coordinate as a fifth parameter measurement result of the fifth line width.

6. The method of claim 5, wherein, A distance between an edge of a normal projection of the pixel definition layer on the substrate and an edge of the substrate away from the direction of the isolation opening is a sixth line width of the display panel; the method further includes: calculating a distance between the first coordinate and the fifth coordinate as a sixth parameter measurement result of the sixth line width.

7. The method of claim 4, wherein, The method further includes: calculating a difference between the first parameter measurement result of the first line width and the second parameter measurement result of the second line width as a seventh parameter measurement result of a seventh line width.

8. The method of claim 6, wherein, An included angle between the side wall and 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 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; calculating an inverse tangent function value of the first ratio as a ninth parameter measurement result of the first angle.

9. The method of claim 8, wherein, The method further includes: determining a target measurement index; the target measurement index is any one of the measurement indexes; the measurement indexes 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 index; calibrating a target parameter measurement result corresponding to the target measurement index by using the target offset value to obtain an updated target parameter measurement result.

10. The method of claim 9, wherein, The method further includes: obtaining a target standard parameter corresponding to the target measurement index; calculating a difference between a target parameter measurement result of the target measurement index and the target standard parameter; if the difference is greater than a preset difference threshold, determining 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 obtaining of the target image includes: Obtaining a target region image containing a target region in the display panel; the target region is a region where a graphical line corresponding to a measurement index is located; the graphical line includes the substrate, the pixel definition layer and the isolation structure; Labeling a to-be-measured region corresponding to the graphical line in the target region image; Performing image processing on the to-be-measured region to obtain a target image.

12. The method of claim 11, wherein, The determining of the gray scale value range corresponding to each basic color channel and the determining of a target color channel according to each gray scale value range include: For each basic color channel, determining a gray scale value contrast corresponding to the basic color channel; Determining the basic color channel with the largest gray scale value contrast as the target color channel.

13. The method of claim 11, wherein, If the edge of the graphical line is a straight line or a convex line, the determining of the boundary line according to the gray scale value distribution of each target gray scale value in the target color channel in a preset direction and the dividing of the color partition according to the boundary line to obtain a target image include: Determining a gray scale value variation of each target gray scale value in the target color channel in a measurement direction, determining the boundary line according to the region with the largest gray scale value variation, and dividing the color partition according to the boundary line to obtain a target image.

14. The method of claim 13, wherein, The determining of the gray scale value variation of each target gray scale value in the target color channel in the measurement direction, the determining of the boundary line according to the region with the largest gray scale value variation, and the dividing of the color partition according to the boundary line to obtain a target image include: Generating a polyline graph of each target gray scale value in the target color channel along the measurement direction; the horizontal axis in the polyline graph represents the pixel position corresponding to the measurement direction, and the vertical axis represents the gray scale value; Based on the polyline graph, determining the region with the largest gray scale value variation, determining the boundary line according to the region with the largest gray scale value variation, and dividing the color partition according to the boundary line to obtain a target image.

15. The method of claim 11, wherein, If the edge of the graphical line is a diagonal line, the determining of the boundary line according to the gray scale value distribution of each target gray scale value in the target color channel in a preset direction and the dividing of the color partition according to the boundary line to obtain a target image include: According to the gray scale value distribution of each target gray scale value in the target color channel in the diagonal direction, determining the boundary line corresponding to the diagonal line, and dividing the color partition according to the boundary line to obtain a target image.

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