Alignment detection method and system for display panel, and display panel

Abstract

Embodiments of the present application provide a display panel alignment detection method and system, and a display panel. The display panel includes a back plate, a plurality of alignment patterns on one side of the back plate, and a plurality of light emitting elements. The plurality of alignment patterns correspond to the plurality of light emitting elements one by one. The method includes: obtaining a detection image of the light emitting elements and the alignment patterns in a first direction perpendicular to a light emitting surface of the display panel; and determining an alignment result of the light emitting elements according to a relative position relationship between the light emitting elements and the corresponding alignment patterns in the detection image. Compared with the related art, the embodiments of the present application can reduce the difficulty of alignment detection of the display panel and improve the accuracy of alignment detection of the display panel.

Description

Technical Field

[0001] This application belongs to the field of display technology, and in particular relates to a method and system for aligning a display panel, and a display panel. Background Technology

[0002] With the development of display technology, the application of sub-millimeter light-emitting diode (Mini LED) display panels and micro light-emitting diode (Micro LED) display panels is becoming increasingly widespread. Because Micro LEDs and Mini LEDs need to be transferred to the backplane through mass transfer technology, alignment detection of Micro LEDs and Mini LEDs is particularly important to ensure display quality.

[0003] However, the inventors of this application have discovered that current alignment detection methods for display panels are difficult to implement and prone to missed detections and false detections. Summary of the Invention

[0004] This application provides a method and system for aligning a display panel, and a display panel, which can reduce the difficulty of aligning a display panel and improve the accuracy of aligning a display panel.

[0005] In a first aspect, embodiments of this application provide a method for aligning a display panel. The display panel includes a back panel and a plurality of alignment patterns and a plurality of light-emitting elements located on one side of the back panel. The plurality of alignment patterns correspond one-to-one with the plurality of light-emitting elements. The method includes: acquiring detection images of the light-emitting elements and alignment patterns along a first direction perpendicular to the light-emitting surface of the display panel; and determining the alignment result of the light-emitting elements based on the relative positional relationship between the light-emitting elements and the corresponding alignment patterns in the detection images.

[0006] According to the first aspect of this application, each alignment pattern is located in the bonding region of the corresponding light-emitting element, and the size of the alignment pattern is greater than or equal to the size of the light-emitting element; the alignment result of the light-emitting element is determined based on the relative positional relationship between the light-emitting element in the detection image and the corresponding alignment pattern, specifically including: when there is no light-emitting element in the alignment pattern, or when the boundary of the alignment pattern is blocked by the light-emitting element, it is determined that there is an alignment deviation of the light-emitting element corresponding to the alignment pattern.

[0007] In this way, the embodiments of this application can accurately determine whether there is a misalignment of the light-emitting element simply by judging whether there is a light-emitting element in the alignment pattern or whether the boundary of the alignment pattern is blocked by the light-emitting element. This simplifies the alignment detection process, greatly reduces the difficulty of alignment detection of the display panel, and avoids missed detection and false detection of the light-emitting element.

[0008] According to any of the foregoing embodiments of the first aspect of this application, before determining that there is a misalignment of the light-emitting element corresponding to the alignment pattern when there is no light-emitting element in the alignment pattern or the boundary of the alignment pattern is blocked by a light-emitting element, the method further includes: when there is an object in the alignment pattern and the alignment pattern is not blocked by the object, obtaining the measured area and / or measured shape of the object, and determining whether the measured area is within a preset area range and / or whether the measured shape is the target shape; when there is no object in the alignment pattern, or when there is an object in the alignment pattern and the measured area is not within the preset area range and / or the measured shape is not the target shape, determining that there is no light-emitting element in the alignment pattern.

[0009] In this way, when there are objects in the alignment pattern, the interference of foreign objects other than light-emitting elements on the alignment detection results can be eliminated by judging the area and / or shape of the objects, thereby further improving the accuracy of the alignment detection results.

[0010] According to any of the foregoing embodiments of the first aspect of this application, at least one side of the alignment pattern is provided with distance scale lines and / or angle scale lines.

[0011] In this way, by providing distance scale lines and / or angle scale lines on at least one side of the alignment pattern, it is convenient for inspectors to accurately determine the offset of the light-emitting element and / or the rotation angle of the light-emitting element when re-inspecting the alignment of the light-emitting element with a microscope.

[0012] According to any of the foregoing embodiments of the first aspect of this application, before determining that there is a misalignment of the light-emitting element corresponding to the alignment pattern when there is no light-emitting element in the alignment pattern or the boundary of the alignment pattern is blocked by a light-emitting element, the method further includes: when the boundary of the alignment pattern is blocked by an object, obtaining the measured area and / or measured shape of the object, and determining whether the measured area is within a preset area range and / or whether the measured shape is a target shape; when the measured area is not within the preset area range and / or the measured shape is not a target shape, determining that the alignment pattern is not blocked by a light-emitting element; when the measured area is within the preset area range and / or the measured shape is a target shape, determining that the alignment pattern is blocked by a light-emitting element.

[0013] In this way, when the boundary of the alignment pattern is obscured by an object, the interference of foreign objects other than the light-emitting element on the alignment detection results can be eliminated by judging the area and / or shape of the object, thereby further improving the accuracy of the alignment detection results.

[0014] According to any of the foregoing embodiments of the first aspect of this application, when the measured area is within a preset area range and the measured shape is the target shape, it is determined that the alignment pattern is blocked by the light-emitting element.

[0015] In this way, both the area and shape of the object are judged, which is equivalent to "double insurance" and reduces the probability of foreign objects being misjudged as light-emitting elements, thereby improving the accuracy of the alignment detection results.

[0016] According to any of the foregoing embodiments of the first aspect of this application, after determining the alignment result of the light-emitting element based on the relative positional relationship between the light-emitting element and the corresponding alignment pattern in the detection image, the method further includes: if it is determined that there is an alignment deviation of the light-emitting element, determining the offset of the light-emitting element based on the distance between the boundary of the light-emitting element and the boundary of the corresponding alignment pattern; and / or, determining the rotation angle of the light-emitting element based on the angle between the boundary of the light-emitting element and the boundary of the corresponding alignment pattern.

[0017] In this way, when a misalignment is found in the light-emitting element, the offset and / or rotation angle of the light-emitting element can be accurately determined, which can provide a reference for subsequent repair work, and at the same time provide a position correction reference for the transfer of the next batch of light-emitting elements.

[0018] According to any of the foregoing embodiments of the first aspect of this application, the alignment pattern includes an alignment frame with N sides, where N ≥ 3.

[0019] In this way, by setting the alignment pattern as a frame, on the one hand, since the middle area of ​​the alignment frame is hollowed out, no coating material is needed, thus reducing production costs; on the other hand, it is easier to determine the relative positional relationship between the light-emitting element and the boundary of the alignment frame, reducing the difficulty of alignment detection.

[0020] According to any of the foregoing embodiments of the first aspect of this application, N = 4.

[0021] In this way, since the shape of the light-emitting element is usually close to a rectangle, setting the alignment pattern as an alignment frame with four sides can make the shape of the alignment frame match the shape of the light-emitting element more closely, making it easier to determine the relative positional relationship between the light-emitting element and the boundary of the alignment frame, thereby reducing the difficulty of alignment detection.

[0022] According to any of the foregoing embodiments of the first aspect of this application, the material of the alignment pattern is an insulating material.

[0023] In this way, since the alignment pattern is made of insulating material, short circuits between the alignment pattern and electronic components or metal traces in the display panel can be avoided, thus improving the circuit stability of the display panel.

[0024] According to any of the foregoing embodiments of the first aspect of this application, the backplane includes a substrate, a driving device layer and a pixel definition layer stacked together. The pixel definition layer has a plurality of openings, and each opening is provided with a bonding point to which the light-emitting element is bonded. The alignment pattern is located in the opening, or the alignment pattern is located on the surface of the pixel definition layer away from the substrate.

[0025] According to any of the foregoing embodiments of the first aspect of this application, the material of the alignment pattern is different from the material of the pixel definition layer.

[0026] In this way, by using a material different from the material of the pixel definition layer to set the alignment pattern, the recognition of the alignment pattern can be improved, so that the alignment pattern can be clearly identified in the detection image, and thus the relative positional relationship between the light-emitting element and the corresponding alignment pattern can be accurately determined.

[0027] Secondly, embodiments of this application provide a alignment detection system for a display panel. The display panel includes a back panel and multiple alignment patterns and multiple light-emitting elements located on one side of the back panel. The multiple alignment patterns correspond one-to-one with the multiple light-emitting elements. The system includes: an image acquisition module, used to acquire detection images of the light-emitting elements and alignment patterns along a first direction perpendicular to the light-emitting surface of the display panel; and a processing module, used to determine the alignment result of the light-emitting elements based on the relative positional relationship between the light-emitting elements and the corresponding alignment patterns in the detection images.

[0028] Thirdly, embodiments of this application provide a display panel, which includes a back plate and a plurality of alignment patterns and a plurality of light-emitting elements located on one side of the back plate. The plurality of alignment patterns correspond one-to-one with the plurality of light-emitting elements, and each alignment pattern is located in the bonding area of ​​the corresponding light-emitting element.

[0029] According to an embodiment of the third aspect of this application, the alignment pattern includes an alignment frame with N sides, where N ≥ 3.

[0030] According to any of the foregoing embodiments of the third aspect of this application, the material of the alignment pattern is an insulating material.

[0031] According to any of the foregoing embodiments of the third aspect of this application, at least one side of the alignment pattern is provided with distance scale lines and / or angle scale lines.

[0032] This application discloses a method and system for aligning a display panel, including a back panel, multiple alignment patterns and multiple light-emitting elements located on one side of the back panel, with each alignment pattern corresponding to one of the multiple light-emitting elements. The method includes: acquiring detection images of the light-emitting elements and alignment patterns along a first direction perpendicular to the light-emitting surface of the display panel; and determining the alignment result of the light-emitting elements based on the relative positional relationship between the light-emitting elements and their corresponding alignment patterns in the detection images. Compared to related technologies, this application determines the alignment result of the light-emitting elements based on the relative position between the light-emitting elements and their corresponding alignment patterns, eliminating the need for extensive mathematical calculations. This reduces the difficulty of aligning the display panel, and because the relative position between the light-emitting elements and their corresponding alignment patterns is more intuitive and easier to judge, it reduces the probability of missed detections and false detections, thereby improving the accuracy of the alignment detection of the display panel. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A top view schematic diagram of a display panel provided in an embodiment of this application;

[0035] Figure 2 A schematic flowchart illustrating a alignment detection method for a display panel provided in an embodiment of this application;

[0036] Figure 3 This is a partial cross-sectional schematic diagram of a display panel provided in an embodiment of this application;

[0037] Figure 4 A partial top view of a display panel provided in an embodiment of this application;

[0038] Figure 5 A partial top view of a display panel provided in an embodiment of this application;

[0039] Figure 6 Another schematic flowchart of the alignment detection method for the display panel provided in the embodiments of this application;

[0040] Figure 7 This is another schematic flowchart of the alignment detection method for a display panel provided in an embodiment of this application;

[0041] Figure 8 This is another schematic flowchart of the alignment detection method for a display panel provided in an embodiment of this application;

[0042] Figure 9 A partial top view of a display panel provided in an embodiment of this application;

[0043] Figure 10 A top view of the alignment pattern in the display panel provided in an embodiment of this application;

[0044] Figure 11 A schematic diagram of a alignment pattern in a display panel provided in an embodiment of this application;

[0045] Figure 12 This is another structural schematic diagram of the alignment pattern in the display panel provided in the embodiments of this application;

[0046] Figure 13 This is a partial cross-sectional schematic diagram of a display panel provided in an embodiment of this application;

[0047] Figure 14 A schematic diagram of a display panel alignment detection system provided in an embodiment of this application;

[0048] Figure 15 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0049] Figure 16 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0050] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0052] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0053] In the embodiments of this application, the term "electrical connection" can refer to a direct electrical connection between two components, or it can refer to an electrical connection between two components via one or more other components.

[0054] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0055] Before describing the technical solutions provided in the embodiments of this application, in order to facilitate understanding of the embodiments of this application, this application first specifically explains the problems existing in the prior art:

[0056] As mentioned above, the inventors of this application have discovered that current alignment detection methods for display panels are difficult to implement and prone to missed detections and false detections.

[0057] To address the challenges and low accuracy of alignment detection for display panels, the inventors of this application first investigated and analyzed the root causes of these technical problems. The specific research and analysis process is as follows:

[0058] The inventors of this application have discovered that in related technologies, the first step is to use algorithms to distinguish the outline of the light-emitting element. Next, a large amount of mathematical calculation is required to determine the current position of the light-emitting element. Then, the calculated current position is compared with the standard position of the light-emitting element to determine the alignment result. On the one hand, due to the large amount of mathematical calculation involved, alignment detection is quite difficult. On the other hand, the complex background on the backplate (containing wiring, adhesive materials, and conductive particles) results in a complex detection image with low outline discrimination, easily leading to missed detections and false detections.

[0059] In view of the inventors’ above-mentioned research findings, the embodiments of this application provide a method and system for aligning a display panel, and a display panel, which can solve the technical problems of high difficulty and low accuracy in aligning display panels in related technologies.

[0060] The technical concept of this application embodiment is as follows: Multiple alignment patterns, each corresponding to a plurality of light-emitting elements, are set on the back panel of the display panel. During alignment detection, a detection image of the light-emitting element and the alignment pattern is first acquired along a first direction perpendicular to the light-emitting surface of the display panel. Then, based on the relative positional relationship between the light-emitting element and the corresponding alignment pattern in the detection image, the alignment result of the light-emitting element is determined. In this way, since the alignment result of the light-emitting element is determined based on the relative position between the light-emitting element and the corresponding alignment pattern, no large amount of mathematical calculation is required, thus reducing the difficulty of alignment detection of the display panel. Furthermore, since the relative position between the light-emitting element and the corresponding alignment pattern is more intuitive and easier to judge, the probability of missed detections and false detections can be reduced, improving the accuracy of alignment detection of the display panel.

[0061] In addition, during the transfer (alignment) of light-emitting elements, the alignment pattern can also serve as an alignment mark for the corresponding light-emitting elements, which is beneficial for achieving accurate alignment of the light-emitting elements.

[0062] The alignment detection method for the display panel provided in the embodiments of this application will be described below.

[0063] like Figure 1 As shown, the display panel 10 includes a back plate 101 and a plurality of alignment patterns 102 and a plurality of light-emitting elements 103 located on one side of the back plate 101. The plurality of alignment patterns 102 correspond one-to-one with the plurality of light-emitting elements 103. Specifically, the alignment patterns 102 and the light-emitting elements 103 can be located on the side of the back plate 101 closest to the light-emitting surface (display surface) of the display panel 10. The alignment patterns 102 can be disposed on the back plate 101, and the light-emitting elements 103 can be bonded to the back plate 101. The back plate 101 can also be called an array substrate or a driving substrate, and a driving circuit is disposed in the back plate 101. Figure 1(not shown) and the bonding points electrically connected to the drive circuit ( Figure 1 (Not shown), the light-emitting element 103 can be bonded to the bonding site. Exemplarily, the light-emitting element 103 may include an LED chip, which includes, but is not limited to, Micro LED chips and Mini LED chips.

[0064] It should be noted that the alignment pattern 102 can be a single pattern or a combination of patterns. When the alignment pattern 102 is a combination of patterns, that is, one alignment pattern 102 can be composed of multiple sub-patterns. Among them, the sub-patterns can include dots, lines or blocks.

[0065] Combination Figure 2 As shown, the alignment detection method for the display panel provided in this application embodiment includes the following steps S201 and S202.

[0066] S201. Acquire a detection image of the light-emitting element and the alignment pattern along a first direction perpendicular to the light-emitting surface of the display panel.

[0067] like Figure 3 As shown, the optical inspection device 301 can operate along a light-emitting surface perpendicular to the display panel (e.g., Figure 3 The optical inspection device 301 acquires an inspection image of the light-emitting element 103 and the alignment pattern 102 in the first direction Z of the surface a in the image. Exemplarily, the optical inspection device 301 includes, but is not limited to, an automatic optical inspection (AOI) device.

[0068] S202. Determine the alignment result of the light-emitting element based on the relative positional relationship between the light-emitting element and the corresponding alignment pattern in the detection image.

[0069] Specifically, the detection image may include multiple alignment patterns 102 and multiple light-emitting elements 103. For any i-th light-emitting element 103, the alignment result of the i-th light-emitting element 103 can be determined according to the relative positional relationship between the i-th light-emitting element 103 and the alignment pattern 102 corresponding to the i-th light-emitting element 103, where i is a positive integer.

[0070] Compared to related technologies, the embodiments of this application determine the alignment result of the light-emitting element 103 based on the relative positional relationship between the light-emitting element 103 and the corresponding alignment pattern 102, without involving a large amount of mathematical calculations. Therefore, it can reduce the difficulty of alignment detection of the display panel. Furthermore, since the relative position between the light-emitting element and the corresponding alignment pattern is more intuitive and easier to judge than extracting the outline of the light-emitting element, it can reduce the probability of missed detection and false detection, and improve the accuracy of alignment detection of the display panel.

[0071] like Figure 4As shown, according to some embodiments of this application, optionally, each alignment pattern 102 can be located in the bonding region P of the corresponding light-emitting element 103. The bonding region P can be provided with a first bonding point 401 and a second bonding point 402. The first bonding point 401 can be bonded to the first electrode of the light-emitting element 103, and the second bonding point 402 can be bonded to the second electrode of the light-emitting element 103. To clearly identify the relative positional relationship between the light-emitting element 103 and the corresponding alignment pattern 102, optionally, the size of the alignment pattern 102 can be greater than or equal to the size of the light-emitting element 103. This avoids the light-emitting element 103 from obscuring the alignment pattern 102 after bonding.

[0072] Accordingly, S202 may specifically include the following steps: when there is no light-emitting element in the alignment pattern, or when the boundary of the alignment pattern is blocked by a light-emitting element, determine that there is an alignment deviation of the light-emitting element corresponding to the alignment pattern.

[0073] See also Figure 4 It is easy to understand that for any j-th alignment pattern, if there is no light-emitting element 103 in the j-th alignment pattern 102, it means that the light-emitting element 103 corresponding to the j-th alignment pattern 102 is missing, and it can be determined that there is an alignment deviation in the light-emitting element 103 corresponding to the j-th alignment pattern 102, where j is a positive integer. When the boundary of the j-th alignment pattern 102 is occluded by the light-emitting element 103, it can also be determined that there is an alignment deviation in the light-emitting element 103 corresponding to the j-th alignment pattern 102. Conversely, when there is a light-emitting element 103 in the j-th alignment pattern 102, and the boundary of the j-th alignment pattern 102 is not occluded by the light-emitting element 103, it can be determined that there is no alignment deviation in the light-emitting element 103 corresponding to the j-th alignment pattern 102.

[0074] It should be noted that when determining whether there is a misalignment between the light-emitting element 103 corresponding to the alignment pattern 102 and the light-emitting element 103, it is possible to first determine whether there is a light-emitting element 103 in the alignment pattern 102, and then determine whether the boundary of the alignment pattern 102 is blocked by the light-emitting element 103; or it is possible to first determine whether the boundary of the alignment pattern 102 is blocked by the light-emitting element 103, and then determine whether there is a light-emitting element 103 in the alignment pattern 102; of course, it is also possible to simultaneously determine whether there is a light-emitting element 103 in the alignment pattern 102 and whether the boundary of the alignment pattern 102 is blocked by the light-emitting element 103. This application embodiment does not limit this.

[0075] In this way, the embodiments of this application can accurately determine whether there is an alignment deviation of the light-emitting element 103 simply by judging whether there is a light-emitting element 103 in the alignment pattern 102 or whether the boundary of the alignment pattern 102 is blocked by the light-emitting element 103. This simplifies the alignment detection process, greatly reduces the difficulty of alignment detection of the display panel, and avoids missed detection and false detection of the light-emitting element.

[0076] like Figure 5 As shown, the inventors of this application considered that there might be foreign objects w (such as conductive particles or other objects) other than the light-emitting element 103 on the back plate 101, and the presence of foreign objects w might affect the alignment detection results. Therefore, in order to improve the accuracy of the alignment detection results, such as Figure 6 As shown, according to some embodiments of this application, optionally, before determining in S604 that there is a misalignment in the light-emitting element corresponding to the alignment pattern, S202 may also include the following steps S602 and S603.

[0077] S602. When there is an object in the alignment pattern and the alignment pattern is not occluded by the object, obtain the measured area and / or measured shape of the object, and determine whether the measured area is within the preset area range and / or whether the measured shape is the target shape.

[0078] Since the area of ​​the foreign object w is usually different from the area of ​​the light-emitting element 103, and the shape of the foreign object w is usually different from the shape of the light-emitting element 103, the foreign object w can be excluded based on the determination of area and / or shape. Specifically, when there is an object (i.e., the light-emitting element 103 or the foreign object w) in the alignment pattern 102, and the alignment pattern 102 is not obscured by the object, the area of ​​the object can be calculated by a target area algorithm (such as the Monte Carlo algorithm). For ease of distinction, this is referred to as the measured area. And / or, when there is an object (i.e., the light-emitting element 103 or the foreign object w) in the alignment pattern 102, the outline (shape) of the object can be extracted. For ease of distinction, this is referred to as the measured shape. After obtaining the measured area and / or the measured shape of the object, it can be determined whether the measured area of ​​the object is within a preset area range and / or whether the measured shape of the object is the target shape. The preset area range and the target shape can be flexibly adjusted according to the actual situation, and this embodiment does not limit them. For example, considering processing errors and image errors, the preset area range can be equal to S ± ΔS, where S represents the area of ​​the predetermined light-emitting element 103, and ΔS represents the area error. For example, considering processing errors and image errors, the target shape can be the predetermined shape or an approximate shape of the light-emitting element 103. For example, when the light-emitting element 103 is rectangular, the target shape can be a right-angled rectangle, a rounded rectangle, or a rectangle missing one or more corners.

[0079] It should be noted that in some specific examples, the area within the alignment pattern 102 can also be obtained. Here, the area within the alignment pattern 102 can specifically be the area within the alignment pattern 102 that is not obscured by an object (light-emitting element 103 or foreign object w). It is easy to understand that when the light-emitting element 103 is located within the alignment pattern 102, the area within the alignment pattern 102 that is not obscured by an object is smaller; while when the light-emitting element 103 is not located within the alignment pattern 102 or a portion of the light-emitting element 103 is located outside the alignment pattern 102, the area within the alignment pattern 102 that is not obscured by an object is larger. Therefore, an area threshold can be set. When the area within the alignment pattern 102 that is not obscured by an object is greater than this area threshold, it is considered that there is no light-emitting element 103 in the alignment pattern 102 or that the alignment pattern 102 is obscured by the light-emitting element 103. It should be noted that the area threshold can be flexibly set according to actual circumstances, and this embodiment does not limit it.

[0080] S603. If there is no object in the alignment pattern, or if there is an object in the alignment pattern but the measured area is not within the preset area range and / or the measured shape is not the target shape, it is determined that there is no light-emitting element in the alignment pattern.

[0081] Specifically, for any j-th alignment pattern, if an object exists in the j-th alignment pattern 102, but the measured area of ​​the object is not within the preset area range and / or the measured shape of the object is not the target shape, it indicates that the object in the j-th alignment pattern 102 is a foreign object w, that is, there is no light-emitting element 103 in the j-th alignment pattern 102, and it can be determined that there is no light-emitting element 103 in the j-th alignment pattern 102. Furthermore, if no object exists in the j-th alignment pattern 102, it indicates that there is neither a light-emitting element 103 nor a foreign object w in the j-th alignment pattern 102, and it can also be determined that there is no light-emitting element 103 in the j-th alignment pattern 102.

[0082] In this way, when there is an object in the alignment pattern 102, by judging the area and / or shape of the object, the interference of foreign objects w other than the light-emitting element 103 on the alignment detection result can be eliminated, and the foreign object w can be misjudged as the light-emitting element 103, thereby further improving the accuracy of the alignment detection result.

[0083] It should be noted that when there is an object in the j-th alignment pattern 102, there is another situation: the j-th alignment pattern 102 contains both a light-emitting element 103 and a foreign object w. In the case where the j-th alignment pattern 102 contains both a light-emitting element 103 and a foreign object w, if the j-th alignment pattern 102 is not obscured, it means that the j-th alignment pattern 102 is neither obscured by the light-emitting element 103 nor by the foreign object w. Therefore, it can be determined that the light-emitting element 103 corresponding to the j-th alignment pattern 102 has no alignment deviation.

[0084] In the case where the j-th alignment pattern 102 contains both a light-emitting element 103 and a foreign object w, if the j-th alignment pattern 102 is obscured, one possibility is that it is obscured by the light-emitting element 103, and another possibility is that it is obscured by the foreign object w. Since the colors (pixel values) of the light-emitting element 103 and the foreign object w are usually different (e.g., the color of the light-emitting element 103 is red, blue, green, or white, while the foreign object w is gray or black), to avoid misjudgment, the pixel values ​​of one or more points in the obscured area of ​​the j-th alignment pattern 102 can be extracted. When the extracted pixel value is not within a preset pixel value range, it is determined that the j-th alignment pattern 102 is obscured by the foreign object w. When the extracted pixel value is within a preset pixel value range, it is determined that the j-th alignment pattern 102 is obscured by the light-emitting element 103. The preset pixel value range can be the pixel value range corresponding to red, blue, green, or white; this embodiment does not limit this. When the pixel values ​​of some extracted points are within a preset pixel value range, while those of others are not, it can be determined that the j-th alignment pattern 102 is simultaneously obscured by the light-emitting element 103 and the foreign object w. As long as it is determined that the j-th alignment pattern 102 is obscured by the light-emitting element 103 (including the case where it is simultaneously obscured by the light-emitting element 103 and the foreign object w), it can be determined that the light-emitting element 103 corresponding to the j-th alignment pattern 102 has an alignment deviation.

[0085] like Figure 7 As shown, according to some embodiments of this application, optionally, before determining in S704 that there is a misalignment in the light-emitting element corresponding to the alignment pattern, S202 may also include the following steps S701 to S703.

[0086] S701. When the boundary of the alignment pattern is occluded by an object, obtain the measured area and / or measured shape of the object, and determine whether the measured area is within the preset area range and / or whether the measured shape is the target shape.

[0087] Specifically, when the boundary of the alignment pattern 102 is obscured by an object (i.e., the light-emitting element 103 or the foreign object w), the measured area of ​​the object can be calculated using a target area algorithm (such as the Monte Carlo algorithm). And / or, when an object (i.e., the light-emitting element 103 or the foreign object w) exists in the alignment pattern 102, the outline (shape) of the object can be extracted; for ease of distinction, this is referred to as the measured shape. After obtaining the measured area and / or the measured shape of the object, it can be determined whether the measured area of ​​the object is within a preset area range and / or whether the measured shape of the object is the target shape. The preset area range and the target shape can be flexibly adjusted according to actual conditions, and this embodiment does not limit this. For example, considering processing errors and image errors, the preset area range can be equal to S ± ΔS, where S represents the predetermined area of ​​the light-emitting element 103, and ΔS represents the area error. For example, taking into account processing errors and image errors, the target shape can be a predetermined shape or approximate shape of the light-emitting element 103. For example, when the light-emitting element 103 is a rectangle, the target shape can be a right-angled rectangle, a rounded rectangle, or a rectangle missing one or more corners.

[0088] S702. When the measured area is not within the preset area range and / or the measured shape is not the target shape, determine that the alignment pattern is not blocked by the light-emitting element.

[0089] Specifically, when the measured area of ​​an object is not within the preset area range and / or the measured shape of the object is not the target shape, it indicates that the alignment pattern 102 is blocked by the foreign object w, and it can be determined that the alignment pattern 102 is not blocked by the light-emitting element 103.

[0090] S703. When the measured area is within the preset area range and / or the measured shape is the target shape, it is determined that the alignment pattern is blocked by the light-emitting element.

[0091] Specifically, when the measured area of ​​the object is within a preset area range and / or the measured shape of the object is the target shape, it can be determined that the alignment pattern 102 is blocked by the light-emitting element 103.

[0092] In this way, when the boundary of the alignment pattern 102 is obscured by an object, the interference of foreign objects w other than the light-emitting element 103 on the alignment detection result can be eliminated by judging the area and / or shape of the object, avoiding misjudging the foreign object w as the light-emitting element 103, and further improving the accuracy of the alignment detection result.

[0093] In some specific embodiments, S703 may optionally include the following steps: when the measured area of ​​the object is within a preset area range and the measured shape of the object is the target shape, determine that the alignment pattern is blocked by the light-emitting element.

[0094] In this way, both the area and shape of the object are judged, which is equivalent to "double insurance" and reduces the probability of foreign objects being misjudged as light-emitting elements, thereby improving the accuracy of the alignment detection results.

[0095] like Figure 8 As shown, according to some embodiments of this application, optionally, after step S202, the alignment detection method of the display panel provided in the embodiments of this application may further include the following steps S801 and / or S802.

[0096] S801. If it is determined that there is a misalignment in the light-emitting element, the offset of the light-emitting element shall be determined according to the distance between the boundary of the light-emitting element and the boundary of the corresponding alignment pattern.

[0097] like Figure 9 As shown, when a misalignment is determined in the light-emitting element 103, the offset of the light-emitting element 103 in the row direction X can be determined based on the distance L1 between the boundary b1 of the light-emitting element 103 and the boundary b1' of the corresponding alignment pattern 102. The extension directions of the boundary b1 of the light-emitting element 103 and the boundary b1' of the alignment pattern 102 can intersect the row direction X. Similarly, the offset of the light-emitting element 103 in the column direction Y can be determined based on the distance L2 between the boundary b2 of the light-emitting element 103 and the boundary b2' of the corresponding alignment pattern 102. The extension directions of the boundary b2 of the light-emitting element 103 and the boundary b2' of the alignment pattern 102 can intersect the column direction Y. It should be noted that distances L1 and L2 can be the minimum straight-line distance, or vertical distance.

[0098] S802. If it is determined that there is a misalignment in the light-emitting element, the rotation angle of the light-emitting element shall be determined according to the angle between the boundary of the light-emitting element and the boundary of the corresponding alignment pattern.

[0099] See also Figure 9 If it is determined that there is a misalignment in the light-emitting element 103, the rotation angle of the light-emitting element 103 can be determined according to the angle θ between the boundary b1 of the light-emitting element 103 and the boundary b1' of the corresponding alignment pattern 102.

[0100] In this way, when it is determined that there is a misalignment in the light-emitting element 103, the offset and / or rotation angle of the light-emitting element 103 can be accurately determined, which can provide a reference for subsequent repair work, and can also provide a position correction reference for the transfer of the next batch of light-emitting elements.

[0101] like Figure 10 As shown, according to some embodiments of this application, optionally, at least one side of the alignment pattern 102 may be provided with distance scale lines and / or angle scale lines.

[0102] In this way, by providing distance scale lines and / or angle scale lines on at least one side of the alignment pattern 102, it is convenient for inspectors to accurately know the offset of the light-emitting element and / or the rotation angle of the light-emitting element when re-inspecting the alignment of the light-emitting element with a microscope.

[0103] like Figure 11 As shown, according to some embodiments of this application, optionally, the alignment pattern 102 may include an alignment frame with N sides, where N ≥ 3. For example, the alignment pattern 102 may be an alignment frame with 3 sides, 4 sides, 5 sides, or more than 5 sides. It should be noted that the alignment frame may be a closed shape or a... Figure 12 The figure shown is an open shape.

[0104] In this way, by setting the alignment pattern as a frame, on the one hand, since the middle area of ​​the alignment frame is hollowed out, no coating material is needed, thus reducing production costs; on the other hand, it is easier to determine the relative positional relationship between the light-emitting element and the boundary of the alignment frame, reducing the difficulty of alignment detection.

[0105] In some specific embodiments, N = 4.

[0106] It is easy to understand that since the shape of the light-emitting element 103 is usually approximately rectangular (such as a rounded rectangle), setting the alignment pattern 102 as an alignment frame with 4 sides can make the shape of the alignment frame match the shape of the light-emitting element 103 more closely, making it easier to determine the relative positional relationship between the light-emitting element and the boundary of the alignment frame, thereby reducing the difficulty of alignment detection.

[0107] In some specific embodiments, the material of the alignment pattern 102 may optionally be an insulating material. Specifically, the material of the alignment pattern 102 may be an organic material or an inorganic material. For example, the material of the alignment pattern 102 may be silicon oxide, silicon nitride, polyimide, etc.

[0108] In this way, since the alignment pattern is made of insulating material, short circuits between the alignment pattern and electronic components or metal traces in the display panel can be avoided, thus improving the circuit stability of the display panel.

[0109] The film layer distribution of the alignment pattern 102 will be described below with reference to some embodiments.

[0110] like Figure 13As shown, according to some embodiments of this application, optionally, the backplane 101 may include a substrate 01, a driving device layer 02, and a pixel definition layer PDL stacked together. The pixel definition layer PDL has a plurality of openings k1, and each opening k1 may contain a bonding point 03 to which the light-emitting element 103 is bonded, and the light-emitting element 103. Exemplarily, the alignment pattern 102 may be located in the opening k1. Of course, in other examples, the alignment pattern 102 may also be located on the surface of the pixel definition layer PDL facing away from the substrate 01 (e.g., ...). Figure 13 (Surface b shown).

[0111] In some specific embodiments, the material of the alignment pattern 102 may optionally be different from the material of the pixel definition layer (PDL). For example, the material of the pixel definition layer (PDL) may be polyimide, while the material of the alignment pattern 102 may be other organic or inorganic materials besides polyimide.

[0112] In this way, by using a material different from the material of the pixel definition layer PDL to set the alignment pattern 102, the recognition of the alignment pattern 102 can be improved, so that the alignment pattern 102 can be clearly identified in the detection image, and the relative positional relationship between the light-emitting element 103 and the corresponding alignment pattern 102 can be accurately determined.

[0113] According to some embodiments of this application, optionally, before the light-emitting element 103 is transferred to the back plate 101, an alignment pattern 102 can be formed on the side of the back plate 101 near the light-emitting surface of the display panel using a patterning process. Then, conductive adhesive is coated on the side of the back plate 101 near the light-emitting surface of the display panel. The conductive adhesive contains conductive particles. The conductive adhesive can cover the bonding sites 03 and the alignment pattern 102. Finally, the light-emitting element 103 is transferred onto the back plate 101. By pressing the conductive adhesive, the electrodes of the light-emitting element 103 can be bonded to the bonding sites 03.

[0114] Based on the alignment detection method for the display panel provided in the above embodiments, this application also provides a specific implementation of the alignment detection system for the display panel. Please refer to the following embodiments.

[0115] Combination Figure 1 As shown in this embodiment, the display panel 10 includes a back plate 101 and a plurality of alignment patterns 102 and a plurality of light-emitting elements 103 located on one side of the back plate 101. The plurality of alignment patterns 102 correspond one-to-one with the plurality of light-emitting elements 103.

[0116] like Figure 14 As shown, the alignment detection system 1400 for a display panel provided in this application embodiment includes the following units:

[0117] The image acquisition module 1401 is used to acquire detection images of the light-emitting element and the alignment pattern along a first direction perpendicular to the light-emitting surface of the display panel;

[0118] The processing module 1402 is used to determine the alignment result of the light-emitting element based on the relative positional relationship between the light-emitting element in the detection image and the corresponding alignment pattern.

[0119] The alignment detection system for a display panel according to an embodiment of this application includes a back panel, multiple alignment patterns and multiple light-emitting elements located on one side of the back panel, with each alignment pattern corresponding to one of the multiple light-emitting elements. The system includes: an image acquisition module 1401, used to acquire detection images of the light-emitting elements and alignment patterns along a first direction perpendicular to the light-emitting surface of the display panel; and a processing module 1402, used to determine the alignment result of the light-emitting elements based on the relative positional relationship between the light-emitting elements and their corresponding alignment patterns in the detection images. Compared with related technologies, this embodiment determines the alignment result of the light-emitting elements based on the relative position between the light-emitting elements and their corresponding alignment patterns, without involving a large amount of mathematical calculations. Therefore, it can reduce the difficulty of alignment detection of the display panel. Furthermore, since the relative position between the light-emitting elements and their corresponding alignment patterns is more intuitive and easier to judge, it can reduce the probability of missed detections and false detections, and improve the accuracy of alignment detection of the display panel.

[0120] In some embodiments, the image acquisition module 1401 and the processing module 1402 can be integrated inside the optical inspection equipment. The optical inspection equipment includes, but is not limited to, automatic optical inspection (AOI) equipment.

[0121] In some embodiments, each alignment pattern is located in the bonding region of the corresponding light-emitting element, and the size of the alignment pattern is greater than or equal to the size of the light-emitting element; the processing module 1402 is specifically used to determine that there is an alignment deviation of the light-emitting element corresponding to the alignment pattern when there is no light-emitting element in the alignment pattern, or when the boundary of the alignment pattern is blocked by the light-emitting element.

[0122] In some embodiments, the processing module 1402 is further configured to, when there is an object in the alignment pattern and the alignment pattern is not occluded by the object, obtain the measured area and / or measured shape of the object, and determine whether the measured area is within a preset area range and / or whether the measured shape is the target shape; when there is no object in the alignment pattern, or when there is an object in the alignment pattern and the measured area is not within the preset area range and / or the measured shape is not the target shape, determine that there is no light-emitting element in the alignment pattern.

[0123] In some embodiments, the processing module 1402 is further configured to, when the boundary of the alignment pattern is occluded by an object, obtain the measured area and / or measured shape of the object, and determine whether the measured area is within a preset area range and / or whether the measured shape is a target shape; when the measured area is not within the preset area range and / or the measured shape is not a target shape, determine that the alignment pattern is not occluded by the light-emitting element; when the measured area is within the preset area range and / or the measured shape is a target shape, determine that the alignment pattern is occluded by the light-emitting element.

[0124] In some embodiments, the processing module 1402 is specifically used to determine that the alignment pattern is blocked by the light-emitting element when the measured area is within a preset area range and the measured shape is the target shape.

[0125] In some embodiments, the processing module 1402 is further configured to, when it is determined that there is a misalignment in the light-emitting element, determine the offset of the light-emitting element based on the distance between the boundary of the light-emitting element and the boundary of the corresponding alignment pattern; and / or, determine the rotation angle of the light-emitting element based on the angle between the boundary of the light-emitting element and the boundary of the corresponding alignment pattern.

[0126] In some embodiments, at least one side of the alignment pattern is provided with distance scale lines and / or angle scale lines.

[0127] In some embodiments, the alignment pattern includes an alignment frame with N sides, where N ≥ 3.

[0128] In some embodiments, the alignment pattern includes an alignment frame with N sides, where N = 4.

[0129] In some embodiments, the material of the alignment pattern is an insulating material.

[0130] In some embodiments, the display panel includes a substrate, a driving device layer and a pixel definition layer stacked together. The pixel definition layer has a plurality of openings, and each opening has a bonding point where a light-emitting element is bonded. The alignment pattern is located in the opening, or the alignment pattern is located on the surface of the pixel definition layer away from the substrate.

[0131] In some embodiments, the material of the alignment pattern is different from the material of the pixel definition layer.

[0132] Based on the alignment detection method and system for the display panel provided in the above embodiments, this application also provides a display panel. For example... Figure 15As shown, the display panel 1500 includes a back plate 101 and a plurality of alignment patterns 102 and a plurality of light-emitting elements 103 located on one side of the back plate 101. Each alignment pattern 102 corresponds one-to-one with a light-emitting element 103, and each alignment pattern 102 is located in the bonding region P of the corresponding light-emitting element 103. It should be noted that the display panel 1500 has the same structure as the display panel 10 in the above method embodiment and the above system embodiment; for the sake of brevity, it will not be described again here.

[0133] The display panel 1500 provided in this application embodiment has a plurality of alignment patterns 102 on the back plate 101 of the display panel, which correspond one-to-one with a plurality of light-emitting elements 103. On the one hand, when the light-emitting elements 103 are transferred (aligned), the alignment patterns can also serve as alignment marks for the corresponding light-emitting elements, which is beneficial to achieve accurate alignment of the light-emitting elements. On the other hand, during alignment detection, the alignment result of the light-emitting elements can be determined according to the relative position between the light-emitting elements 103 and the alignment pattern 102 corresponding to each light-emitting element 103, which can reduce the difficulty of alignment detection of the display panel and improve the accuracy of alignment detection of the display panel.

[0134] In some embodiments, alignment pattern 102 may include alignment frame with N sides, where N≥3.

[0135] In some embodiments, the material of the alignment pattern 102 may be an insulating material.

[0136] In some embodiments, at least one side of the alignment pattern 102 may be provided with distance scale lines and / or angle scale lines.

[0137] The display panel 1500 has the same structure as the display panel 10 in the above method embodiment and the above system embodiment, and will not be described again here for the sake of brevity.

[0138] Based on the alignment detection method for the display panel provided in the above embodiments, this application also provides specific implementation methods for electronic devices. Please refer to the following embodiments.

[0139] Figure 16 A schematic diagram of the hardware structure of the electronic device provided in an embodiment of this application is shown.

[0140] The electronic device may include a processor 1601 and a memory 1602 storing computer program instructions.

[0141] Specifically, the processor 1601 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0142] Memory 1602 may include mass storage for data or instructions. For example, and not limitingly, memory 1602 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. In one example, memory 1602 may include removable or non-removable (or fixed) media, or memory 1602 may be non-volatile solid-state memory. Memory 1602 may be internal or external to the integrated gateway disaster recovery device.

[0143] In one example, memory 1602 may be read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0144] Memory 1602 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Therefore, typically, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to one aspect of this application.

[0145] Processor 1601 reads and executes computer program instructions stored in memory 1602 to achieve... Figure 2 The method / steps S201 to S202 in the illustrated embodiment achieve the following: Figure 2 The technical effects achieved by executing the methods / steps shown in the examples are not elaborated here for the sake of brevity.

[0146] In one example, the electronic device may also include a communication interface 1603 and a bus 1610. For example, Figure 16As shown, the processor 1601, memory 1602, and communication interface 1603 are connected through bus 1610 and complete communication with each other.

[0147] The communication interface 1603 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0148] Bus 1610 includes hardware, software, or both, that couples components of an electronic device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 1610 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, this application contemplates any suitable bus or interconnect.

[0149] Furthermore, in conjunction with the alignment detection method for the display panel in the above embodiments, this application embodiment can provide a computer-readable storage medium for implementation. This computer-readable storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the alignment detection methods for the display panel in the above embodiments. Examples of computer-readable storage media include non-transitory computer-readable storage media, such as electronic circuits, semiconductor memory devices, ROM, random access memory, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, and hard disks.

[0150] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0151] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0152] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0153] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0154] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for aligning a display panel, characterized in that, The display panel includes a back panel and multiple alignment patterns and multiple light-emitting elements located on one side of the back panel. Each alignment pattern corresponds one-to-one with each of the multiple light-emitting elements. The back panel includes a substrate, a driving device layer, and a pixel definition layer stacked together. The pixel definition layer has multiple openings, each opening containing a bonding point to which the light-emitting elements are bonded. The method includes: Along a first direction perpendicular to the light-emitting surface of the display panel, a detection image of the light-emitting element and the alignment pattern is acquired; The alignment result of the light-emitting element is determined based on the relative positional relationship between the light-emitting element and the corresponding alignment pattern in the detection image; each alignment pattern is located in the bonding region of the corresponding light-emitting element, and the size of the alignment pattern is greater than or equal to the size of the light-emitting element; The step of determining the alignment result of the light-emitting element based on the relative positional relationship between the light-emitting element and the corresponding alignment pattern in the detected image specifically includes: When there is no light-emitting element in the alignment pattern, or when the boundary of the alignment pattern is blocked by the light-emitting element, it is determined that there is an alignment deviation of the light-emitting element corresponding to the alignment pattern; Wherein, at least one side of the alignment pattern is provided with distance scale lines and / or angle scale lines; before determining that the light-emitting element corresponding to the alignment pattern has an alignment deviation when there is no light-emitting element in the alignment pattern, or when the boundary of the alignment pattern is blocked by the light-emitting element, the method further includes: When there is an object in the alignment pattern and the alignment pattern is not occluded by the object, the measured area and measured shape of the object are obtained, and it is determined whether the measured area is within a preset area range and whether the measured shape is the target shape. If there is no object in the alignment pattern, or if there is an object in the alignment pattern and the measured area is not within the preset area range and / or the measured shape is not the target shape, it is determined that there is no light-emitting element in the alignment pattern.

2. The method according to claim 1, characterized in that, Before determining that there is an alignment deviation of the light-emitting element corresponding to the alignment pattern when there is no light-emitting element in the alignment pattern, or when the boundary of the alignment pattern is blocked by the light-emitting element, the method further includes: When the boundary of the alignment pattern is occluded by an object, the measured area and / or measured shape of the object are obtained, and it is determined whether the measured area is within a preset area range and / or whether the measured shape is the target shape. When the measured area is not within the preset area range and / or the measured shape is not the target shape, it is determined that the alignment pattern is not blocked by the light-emitting element; When the measured area is within the preset area range and / or the measured shape is the target shape, it is determined that the alignment pattern is blocked by the light-emitting element.

3. The method according to claim 1, characterized in that, After determining the alignment result of the light-emitting element based on the relative positional relationship between the light-emitting element and the corresponding alignment pattern in the detected image, the method further includes: If it is determined that there is a misalignment in the light-emitting element, the offset of the light-emitting element is determined based on the distance between the boundary of the light-emitting element and the boundary of the corresponding alignment pattern; and / or, the rotation angle of the light-emitting element is determined based on the angle between the boundary of the light-emitting element and the boundary of the corresponding alignment pattern.

4. The method according to claim 1, characterized in that, The alignment pattern includes an alignment frame with N sides, where N ≥ 3.

5. The method according to claim 1, characterized in that, N=4。 6. The method according to claim 1, characterized in that, The material of the alignment pattern is an insulating material.

7. The method according to claim 1, characterized in that, The alignment pattern is located within the opening, or the alignment pattern is located on the surface of the pixel definition layer opposite to the substrate.

8. The method according to claim 1, characterized in that, The material of the alignment pattern is different from the material of the pixel definition layer.

9. A alignment detection system for a display panel, characterized in that, The display panel includes a backplate and multiple alignment patterns and multiple light-emitting elements located on one side of the backplate. Each alignment pattern corresponds one-to-one with a light-emitting element, and each alignment pattern is located in the bonding area of ​​the corresponding light-emitting element. The backplate includes a substrate, a driving device layer, and a pixel definition layer stacked together. The pixel definition layer has multiple openings, and each opening contains a bonding point for the light-emitting element. The system includes: An image acquisition module is used to acquire detection images of the light-emitting element and the alignment pattern along a first direction perpendicular to the light-emitting surface of the display panel; The processing module is used to determine the alignment result of the light-emitting element based on the relative positional relationship between the light-emitting element and the corresponding alignment pattern in the detection image; Each alignment pattern is located in the bonding region of the corresponding light-emitting element, and the size of the alignment pattern is greater than or equal to the size of the light-emitting element; the processing module is specifically used for: When there is no light-emitting element in the alignment pattern, or when the boundary of the alignment pattern is blocked by the light-emitting element, it is determined that there is an alignment deviation of the light-emitting element corresponding to the alignment pattern; Wherein, at least one side of the alignment pattern is provided with distance scale lines and / or angle scale lines; the processing module is further configured to: when there is an object in the alignment pattern and the alignment pattern is not occluded by the object, obtain the measured area and measured shape of the object, and determine whether the measured area is within a preset area range and whether the measured shape is the target shape. If there is no object in the alignment pattern, or if there is an object in the alignment pattern and the measured area is not within the preset area range and / or the measured shape is not the target shape, it is determined that there is no light-emitting element in the alignment pattern.

10. A display panel, characterized in that, The display panel includes a backplate and multiple alignment patterns and multiple light-emitting elements located on one side of the backplate. Each alignment pattern corresponds one-to-one with a light-emitting element, and each alignment pattern is located in the bonding area of ​​the corresponding light-emitting element. The backplate includes a substrate, a driving device layer, and a pixel definition layer stacked together. The pixel definition layer has multiple openings, and each opening has a bonding point for the light-emitting element to be bonded. Each alignment pattern is located in the bonding area of ​​the corresponding light-emitting element, and the size of the alignment pattern is greater than or equal to the size of the light-emitting element. At least one side of the alignment pattern is provided with distance scale lines and / or angle scale lines.

11. The display panel according to claim 10, characterized in that, The alignment pattern includes an alignment frame with N sides, where N ≥ 3.

12. The display panel according to claim 10, characterized in that, The material of the alignment pattern is an insulating material.

Images