Display panel, preparation method thereof, display module and alignment method thereof

Abstract

The application provides a display panel and a preparation method thereof, a display module and an alignment method thereof. The display panel comprises: a substrate; a first isolation structure located on one side of the substrate and in a display area, the first isolation structure surrounding a plurality of first isolation openings; an alignment structure located on the same side of the substrate as the first isolation structure and in an alignment mark area, the width of the alignment structure being greater than the width of the first isolation structure between adjacent first isolation openings in a first direction; the reflectivity of the first isolation structure being different from the reflectivity of the alignment structure; and a plurality of light emitting devices, at least part of the light emitting devices being located in the first isolation openings. The width of the alignment structure is greater than the width of the first isolation opening, and the reflectivity of the alignment structure located in the alignment mark area is different from the reflectivity of the first isolation structure located in the display area, so that the alignment structure and the first isolation structure differ in structure, which is conducive to accurately identifying or obtaining the position of the alignment mark area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel, a preparation method thereof, a display module and an alignment method thereof. BACKGROUND

[0002] In the preparation process of a conventional display panel, a fine metal mask (FMM) is usually used to realize the patterning of light-emitting pixels. The FMM technology is mature and has rich mass production experience. However, the 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 the conventional OLED process on the size, resolution and other performance of the display screen, and has the advantages of high performance, full-size and agile delivery. The patents CN118251982A, CN115666161A, CN116648095A, CN117062489A, CN118678742A, CN118785761A, CN115224220A, CN118678729A, CN118660529A and CN118660589A disclose the related content of the fine metal mask-free technology, which are referred to for reference.

[0003] However, the current display panel still cannot meet the requirements well. SUMMARY

[0004] Therefore, the embodiments of the present application provide a display panel, a preparation method thereof, a display module and an alignment method thereof.

[0005] The first aspect of the present application provides a display panel, which comprises a display area and an alignment mark area, and the alignment mark area is located on at least part of the circumferential side of the display area.

[0006] The display panel comprises:

[0007] a substrate;

[0008] a first isolation structure located on one side of the substrate and in the display area, the first isolation structure surrounding a plurality of first isolation openings;

[0009] an alignment structure located on the same side of the substrate as the first isolation structure and in the alignment mark area, the width of the alignment structure being greater than the width of the first isolation structure between adjacent first isolation openings in the first direction; and the reflectivity of the first isolation structure is different from the reflectivity of the alignment structure.

[0010] a plurality of light-emitting devices, at least part of the light-emitting devices being located in the first isolation openings.

[0011] In one embodiment, the reflectivity of the alignment structure is greater than the reflectivity of the first isolation structure.

[0012] Preferably, the ratio of the reflectivity of the alignment structure to the reflectivity of the first isolation structure is 2-10;

[0013] Preferably, the reflectivity of the alignment structure is greater than or equal to 50% and less than or equal to 100%, and the reflectivity of the first isolation structure is greater than or equal to 10% and less than or equal to 40%;

[0014] Preferably, the thickness of the first isolation structure is different from the thickness of the alignment structure.

[0015] In an embodiment, the first isolation structure comprises a first portion and a second portion stacked, the first portion is located on the side of the second portion away from the substrate, and the orthographic projection of the second portion on the substrate is within the orthographic projection of the first portion on the substrate.

[0016] The alignment structure comprises a third portion and a fourth portion stacked, the third portion is located on the side of the fourth portion away from the substrate, and the orthographic projection of the fourth portion on the substrate overlaps with the orthographic projection of the third portion on the substrate; the reflectivity of the third portion is different from the reflectivity of the first portion.

[0017] Preferably, the reflectivity of the third portion is greater than the reflectivity of the first portion.

[0018] Preferably, the first portion and the third portion are disposed in the same layer, and the second portion and the fourth portion are disposed in the same layer.

[0019] In an embodiment, the first isolation structure further comprises a fifth portion located on the side of the second portion close to the substrate, and the orthographic projection of the second portion on the substrate is within the orthographic projection of the fifth portion on the substrate.

[0020] Preferably, the material of the third portion is the same as the material of the second portion, and / or the material of the fourth portion is the same as the material of the fifth portion.

[0021] Preferably, the material of the third portion comprises aluminum, and the material of the first portion comprises titanium.

[0022] Preferably, the third portion and the second portion are disposed in the same layer, and the fourth portion and the fifth portion are disposed in the same layer.

[0023] Preferably, the thickness of the third portion is less than or equal to the thickness of the second portion.

[0024] In an embodiment, the alignment structure further comprises a sixth portion located on the side of the fourth portion close to the substrate, and the orthographic projection of the fourth portion on the substrate is within the orthographic projection of the sixth portion on the substrate, and the orthographic projection of the fourth portion on the substrate is within the orthographic projection of the third portion on the substrate.

[0025] Preferably, the first portion and the third portion are disposed in the same layer, the second portion and the fourth portion are disposed in the same layer, and the fifth portion and the sixth portion are disposed in the same layer.

[0026] In one embodiment, the first isolation structure comprises a first portion and a second portion stacked, the first portion is located on a side of the second portion away from the substrate, and a projection of the second portion on the substrate is within a projection of the first portion on the substrate;

[0027] The alignment structure comprises a seventh portion, a third portion and a fourth portion stacked, the third portion is located on a side of the fourth portion away from the substrate, a projection of the fourth portion on the substrate overlaps with a projection of the third portion on the substrate, a projection of the seventh portion on the substrate overlaps with a projection of the third portion on the substrate, the first portion is disposed in the same layer as the third portion, and the second portion is disposed in the same layer as the fourth portion;

[0028] Preferably, the reflectivity of the seventh portion is different from the reflectivity of the first portion.

[0029] Preferably, the reflectivity of the seventh portion is greater than the reflectivity of the first portion.

[0030] In one embodiment, the display panel further comprises a frame region, the frame region at least partially surrounds the display region, and the alignment mark region is located in the frame region.

[0031] Preferably, in the first direction, the alignment mark region is located on at least one side of the display region; in the second direction, the alignment mark region is located on at least one side of the display region; and the first direction intersects the second direction.

[0032] Preferably, a projection of the alignment structure on the substrate coincides with a projection of the frame region on the substrate.

[0033] Preferably, an edge of the projection of the alignment structure on the substrate near the display region extends circumferentially along an edge of the display region.

[0034] Preferably, the alignment structure is disposed adjacent to the display region.

[0035] In one embodiment, the display panel further comprises a non-alignment mark region, the non-alignment mark region is located on at least a part of the circumferential side of the display region.

[0036] The display panel further comprises a second isolation structure located in the non-alignment mark region, and the second isolation structure is disposed in the same layer as the first isolation structure.

[0037] Preferably, the display panel further comprises a frame region, the frame region at least partially surrounds the display region, and the non-alignment mark region is located in the frame region.

[0038] Preferably, the second isolation structure surrounds a plurality of second isolation openings, the display panel further comprises redundant light emitting devices, at least part of the redundant light emitting devices are located in the second isolation openings, and at least part of the redundant light emitting devices are overlapped with the second isolation structure.

[0039] Preferably, the redundant light emitting devices are disposed in the same layer as the light emitting devices.

[0040] In one embodiment, further comprising:

[0041] A pixel defining layer between the first isolation structure and the alignment structure and the substrate;

[0042] In the display area, the pixel defining layer surrounds a plurality of pixel openings, a projection of the pixel opening on the substrate is within a projection range of the first isolation opening on the substrate;

[0043] In the alignment mark area, a projection of the alignment structure on the substrate is within a projection range of the pixel defining layer on the substrate.

[0044] The second aspect of the present application provides a display panel, the display panel comprising a display area and an alignment mark area, the alignment mark area being located on at least part of the periphery of the display area;

[0045] The display panel comprises:

[0046] A substrate;

[0047] A first isolation structure on one side of the substrate and in the display area, the first isolation structure surrounding a plurality of first isolation openings;

[0048] An alignment structure on the same side of the substrate as the first isolation structure and in the alignment mark area, in the first direction, the width of the alignment structure being greater than the width of the first isolation structure between adjacent first isolation openings; the distance from the side of the alignment structure facing away from the substrate to the substrate is not the same as the distance from the side of the first isolation structure facing away from the substrate to the substrate;

[0049] A plurality of light emitting devices, at least some of which are located in the first isolation openings.

[0050] In one embodiment, the first isolation structure comprises a first portion and a second portion stacked, the first portion being on the side of the second portion facing away from the substrate, and a projection of the second portion on the substrate being within a projection range of the first portion on the substrate;

[0051] The alignment structure comprises a seventh portion, a third portion and a fourth portion stacked, the third portion being on the side of the fourth portion facing away from the substrate, and a projection of the fourth portion on the substrate overlapping a projection of the third portion on the substrate; a projection of the seventh portion on the substrate overlaps a projection of the third portion on the substrate, the first portion and the third portion are provided in the same layer, and the second portion and the fourth portion are provided in the same layer.

[0052] In one embodiment, the first isolation structure comprises a first portion, a second portion and a fifth portion stacked, the first portion being on the side of the second portion facing away from the substrate, a projection of the second portion on the substrate being within a projection range of the first portion on the substrate, and a projection of the second portion on the substrate being within a projection range of the fifth portion on the substrate;

[0053] The alignment structure comprises the third part and the fourth part which are stacked, the third part is located on the side of the fourth part away from the substrate, and the orthographic projection of the fourth part on the substrate overlaps the orthographic projection of the third part on the substrate; the second part is arranged in the same layer as the third part, and the fifth part is arranged in the same layer as the fourth part;

[0054] Preferably, the thickness of the third part is less than or equal to the thickness of the second part.

[0055] The third aspect of the present application provides a preparation method of a display panel, comprising:

[0056] Preparation of a first electrode layer on one side of the display area of the substrate;

[0057] Preparation of a first isolation structure on the side of the first electrode layer away from the substrate, and preparation of an alignment structure in the alignment mark area; the first isolation structure surrounds a plurality of first isolation openings, and at least part of the first electrode layer is exposed in the first isolation openings; in the first direction, the width of the alignment structure is greater than the width of the first isolation structure between adjacent first isolation openings; the reflectivity of the alignment structure is different from the reflectivity of the first isolation structure;

[0058] Preparation of a first light-emitting functional layer and a second electrode layer in the first isolation openings in sequence to obtain a plurality of light-emitting devices.

[0059] In one embodiment, the step of preparing the first isolation structure on the side of the first electrode layer away from the substrate comprises:

[0060] Preparation of a third isolation material layer, a second isolation material layer and a first isolation material layer on the side of the first electrode layer away from the substrate in the display area and the frame area in sequence;

[0061] The first isolation material layer is subjected to a patterning process to obtain a first part, and the first isolation material layer corresponding to the alignment mark area is removed;

[0062] The second isolation material layer and the third isolation material layer are subjected to a patterning process to obtain the first isolation structure and the alignment structure.

[0063] The fourth aspect of the present application provides a display module, the display module comprising a display area and a frame area, the frame area being located on at least part of the peripheral side of the display area; the frame area comprises an alignment mark area;

[0064] The display module comprises:

[0065] A substrate;

[0066] A first isolation structure located on one side of the substrate and in the display area, the first isolation structure surrounding a plurality of first isolation openings;

[0067] The alignment structure is located on the same side of the substrate as the first isolation structure and is located in the alignment mark area. In the first direction, the width of the alignment structure is greater than the width of the first isolation structure between adjacent first isolation openings. The reflectivity of the alignment structure is different from the reflectivity of the first isolation structure.

[0068] The plurality of light emitting devices, at least part of the light emitting devices are located in the first isolation opening;

[0069] The touch control wire is located in the frame area. The orthogonal projection of the touch control wire on the substrate partially overlaps the orthogonal projection of the alignment structure on the substrate.

[0070] In an embodiment, the orthogonal projection of the touch control wire on the substrate is spaced apart from the orthogonal projection of the part of the alignment structure close to the edge of the display area on the substrate;

[0071] Preferably, the display module further comprises: a cover plate located on the side of the touch control wire away from the substrate, the orthogonal projection of the cover plate on the substrate covers the orthogonal projection of the display area and the frame area on the substrate;

[0072] Preferably, the cover plate comprises an ink area and a transparent area, the ink area is arranged corresponding to the frame area, and the transparent area is arranged corresponding to the display area.

[0073] The fifth aspect of the present application provides an alignment method of a display module, comprising:

[0074] Obtaining a first image of a first surface flush with the surface of the alignment structure away from the substrate, and obtaining a second image of the cover plate; on the first surface, the reflectivity of the first isolation structure is different from the reflectivity of the alignment structure;

[0075] Determining the boundary of the display area or the frame area based on the first image, and determining the boundary of the ink area based on the second image;

[0076] Aligning the cover plate with the display panel based on the boundary of the display area or the frame area and the boundary of the ink area.

[0077] In an embodiment, the first isolation structure comprises a first part, a second part and a third part stacked, and the first part is located on the side of the second part away from the substrate; the alignment structure comprises a third part and a fourth part stacked, and the third part is located on the side of the fourth part away from the substrate;

[0078] Obtaining a first image of a first surface flush with the surface of the alignment structure away from the substrate comprises:

[0079] Obtaining an image of a plane flush with the surface of the third part away from the substrate.

[0080] In an embodiment, the step of determining the boundary of the display area or the frame area based on the first image comprises:

[0081] determine, based on the first image, that the alignment structure is close to an edge of the display area;

[0082] fitting the edges on the same side of the display area as a first straight line in a first direction, and fitting the edges on the same side of the display area as a second straight line in a second direction, the first direction intersecting the second direction;

[0083] determining a boundary of the display area or the frame area based on the first straight line and the second straight line.

[0084] According to the display panel provided in the embodiments of the present application, the width of the alignment structure is greater than the width of the first isolation opening, so that the alignment structure and the first isolation structure are different in structure, which is beneficial to accurately identifying or obtaining the position of the alignment mark area, and the reflectivity of the alignment structure in the alignment mark area is different from the reflectivity of the first isolation structure in the display area, which is more beneficial to improving the accuracy of obtaining the alignment mark area, and is further beneficial to obtaining the boundary of the display area, for example, when the display panel and the cover plate are aligned, the cover plate and the display panel are accurately laminated, and the alignment accuracy is high. BRIEF DESCRIPTION OF DRAWINGS

[0085] Figure 1 FIG. 1 is a schematic diagram of a cross-sectional structure of a display panel in an embodiment of the present application.

[0086] Figure 2 FIG. 2 is a schematic diagram of a top view structure of a display panel in an embodiment of the present application.

[0087] Figure 3 FIG. 3 is a schematic diagram of a top view structure of a display panel in another embodiment of the present application.

[0088] Figure 4 FIG. 4 is a schematic diagram of a top view structure of a display panel in another embodiment of the present application.

[0089] Figure 5 FIG. 5 is a schematic diagram of a cross-sectional structure of a display panel in the prior art.

[0090] Figure 6 FIG. 6 is a schematic diagram of a cross-sectional structure of a display panel in another embodiment of the present application.

[0091] Figure 7 FIG. 7 is a schematic diagram of a cross-sectional structure of a display panel in another embodiment of the present application.

[0092] Figure 8 FIG. 8 is a schematic diagram of a cross-sectional structure of a display panel in another embodiment of the present application.

[0093] Figure 9 FIG. 9 is a schematic diagram of a cross-sectional structure of a display panel in another embodiment of the present application.

[0094] Figure 10A flowchart of a method for manufacturing a display panel in an embodiment of the present application.

[0095] Figures 11-12 A flowchart of a method for manufacturing a display panel in an embodiment of the present application.

[0096] Figure 13 A sectional structure diagram of a display module in an embodiment of the present application.

[0097] Figure 14 A top view structure diagram of a display module in an embodiment of the present application.

[0098] Figure 15 A top view structure diagram of a display module in another embodiment of the present application.

[0099] Figure 16 A sectional structure diagram of a display module in another embodiment of the present application.

[0100] Figure 17 A flowchart of an alignment method of a display module in an embodiment of the present application.

[0101] Figure 18 A structure diagram of a first image in an embodiment of the present application. DETAILED DESCRIPTION

[0102] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0103] In addition, in order to better illustrate the present application, a large number of specific details are given in the detailed description below. Those skilled in the art should understand that the present application can also be implemented without some specific details. In some examples, methods and means familiar to those skilled in the art are not described in detail, in order to highlight the main ideas of the present application.

[0104] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0105] In addition, if the terms "first", "second", etc. are used, they are only used for differentiation description, and cannot be understood as indicating or implying relative importance.

[0106] The first aspect of the present application provides a display panel, which refers to Figure 1A cross-sectional structure schematic diagram of the display panel is shown, the display panel comprising a display area AA and a positioning mark area S1, the positioning mark area S1 being located at least on a part of the periphery of the display area AA.

[0107] Optionally, the display panel further comprises a frame area NA, the frame area NA at least partially surrounding the display area AA, and the positioning mark area S1 being located in the frame area NA. In this way, the setting of the positioning mark area S1 hardly affects the display effect of the display panel.

[0108] Optionally, with reference to Figures 2-4 A top view structure schematic diagram of the display panel is shown, in a first direction x, the positioning mark area S1 being located on at least one side of the display area AA; in a second direction y, the positioning mark area S1 being located on at least one side of the display area AA; the first direction x intersecting the second direction y.

[0109] For example, with reference to Figure 2 in the first direction x, the positioning mark area S1 being located on one side of the display area AA; for example, with reference to Figure 3 in the second direction y, the positioning mark area S1 being located on one side of the display area AA; for example, with reference to Figure 4 in the first direction x, the positioning mark area S1 being located on both sides of the display area AA; in the second direction y, the positioning mark area S1 being located on both sides of the display area AA. It can be understood that as long as the positioning mark area S1 exists, the accurate identification of the display panel can be realized, which is conducive to the accurate positioning of the display panel and the remaining film layers, such as the accurate positioning of the display panel and the cover plate. It can be understood that the larger the area occupied by the positioning mark area S1 in the frame area NA, the more accurate the positioning.

[0110] Optionally, the display panel comprises a substrate 100, a first isolation structure 200, a positioning structure 300 and a plurality of light emitting devices 400.

[0111] Optionally, the first isolation structure 200 is located on one side of the substrate 100 and in the display area AA, and the first isolation structure 200 surrounds a plurality of first isolation openings 210; at least part of the light emitting devices 400 are located in the first isolation openings 210.

[0112] Optionally, the light emitting device 400 comprises a first electrode layer 410, a first light emitting functional layer 420 and a second electrode layer 430 which are sequentially stacked, the first electrode layer 410 being located between the first isolation structure 200 and the substrate 100, and at least part of the first electrode layer 410 being exposed to the first isolation opening 210; the first light emitting functional layer 420 and the second electrode layer 430 being located in the first isolation opening 210.

[0113] For example, the first electrode layer 410 can be an anode, and the second electrode layer 430 can be a cathode. The first light-emitting functional layer 420 includes an emitting layer (EML), and can further include at least one of a hole injection layer (HIL), a hole transport layer (HTL), and an electron-blocking layer (EBL) between the anode and the emitting layer (EML), and at least one of an electron injection layer (EIL), an electron transport layer (ETL), and a hole-blocking layer (HBL) between the cathode and the emitting layer (EML).

[0114] Optionally, the alignment structure 300 and the first isolation structure 200 are located on the same side of the substrate 100 and in the alignment mark area S1. In the first direction x, the width W1 of the alignment structure 300 is greater than the width W2 of the first isolation structure 200 between adjacent first isolation openings 210. The reflectivity of the first isolation structure 200 is different from the reflectivity of the alignment structure 300.

[0115] It can be understood that the width W1 of the alignment structure 300 is greater than the width W2 of the first isolation structure 200 between adjacent first isolation openings 210, so that the alignment structure 300 and the first isolation structure 200 are different in structure, which is beneficial to accurately obtain the position of the alignment mark area S1. Moreover, the reflectivity of the alignment structure 300 located in the alignment mark area S1 is different from the reflectivity of the first isolation structure 200 located in the display area AA, which is more beneficial to improve the accuracy of obtaining the alignment mark area S1, and is further beneficial to obtain the boundary of the display area AA. For example, when aligning the display panel and the cover plate, it is beneficial to accurately bond the cover plate and the display panel, and the alignment accuracy is high.

[0116] For example, when the probe using an optical charge-coupled device (CCD) captures the position of the alignment mark area S1, the alignment structure 300 has high brightness and large width, so that the position of the alignment structure 300 can be accurately identified, and the boundary position of the display area AA is further obtained.

[0117] The present application has found that, in the display panel of the prior art, the alignment mark area S1 is located in the display area AA, and the alignment mark area S1 is not easy to be distinguished from the display area AA, and the alignment accuracy is low. Figure 5The cross-sectional structure schematic diagram of the display panel shown includes the first isolation structure 200 in the display area AA and the frame area NA, so that the distribution of the isolation structures of the display area AA and the frame area NA and the isolation openings are consistent. Although the above structure is beneficial to improve the etching uniformity of the first isolation opening 210 and improve the yield of the display panel. However, the existing problem is that due to the consistency of the structure and material of the first isolation structure 200 and the third isolation structure 500, the boundary of the display area AA or the boundary close to the display area AA of the frame area NA cannot be accurately obtained when the display panel is aligned, resulting in that only the shape of the cover plate and the display panel can be aligned when aligning, and there is a problem of cutting precision of the display panel or the cover plate, so that the fitting precision is low, and the yield of the display module obtained is low.

[0118] In view of the above problems, the present application sets the alignment mark area S1 in the frame area NA, and makes the reflectivity of the alignment structure 300 in the alignment mark area S1 different from the reflectivity of the first isolation structure 200, and the width W1 of the alignment structure 300 is greater than the width W2 of the first isolation structure 200 between adjacent first isolation openings 210. In this way, when the display panel and the cover plate are aligned, the position of the alignment mark area S1 can be accurately obtained, and then the boundary position of the display area AA can be obtained, and the accurate alignment of the display panel and the cover plate can be realized.

[0119] In one embodiment, the reflectivity of the alignment structure 300 is greater than the reflectivity of the first isolation structure 200.

[0120] Optionally, the ratio of the reflectivity of the alignment structure 300 to the reflectivity of the first isolation structure 200 is 2-10, for example, it can be 2, 3, 4, 5, 6, 7, 8, 9 or 10, etc. The difference between the reflectivity of the alignment structure 300 and the reflectivity of the first isolation structure 200 is appropriate, which is beneficial to accurately identify the alignment structure 300 when the display panel is aligned.

[0121] Optionally, the reflectivity of the alignment structure 300 is greater than or equal to 50% and less than or equal to 100%, for example, it can be 50%, 60%, 70%, 80%, 90% or 100%, etc. The reflectivity of the first isolation structure 200 is greater than or equal to 10% and less than or equal to 40%, for example, it can be 10%, 20%, 30% or 40%, etc.

[0122] It can be understood that the thickness of the alignment structure 300 and the first isolation structure 200 can be the same or different. Here, the thickness refers to the distance from the side of the first isolation structure 200 away from the substrate 100 to the substrate 100, taking the first isolation structure 200 as an example for illustration.

[0123] Exemplarily, when the thickness of the alignment structure 300 is the same as that of the first isolation structure 200, the probe of the optical charge coupled device (CCD) captures the reflectivity of the surface of the alignment structure 300 away from the substrate 100, and compares the in-plane reflectivity (for example, the reflectivity of the first isolation structure 200 is smaller, and the field of view is darker, and the reflectivity of the alignment structure 300 is larger, and the field of view is brighter), so as to obtain the position of the alignment mark area S1, and further obtain the boundary position of the display area AA.

[0124] Alternatively, the thickness of the first isolation structure 200 is different from that of the alignment structure 300. For example, when the thickness of the first isolation structure 200 is greater than that of the alignment structure 300, the probe of the optical charge coupled device captures the reflectivity of the surface of the alignment structure 300 away from the substrate 100 (it can be understood that the reflectivity of the first isolation structure 200 in the plane is 0), and compares the in-plane reflectivity, so as to obtain the position of the alignment mark area S1, and further obtain the edge position of the display area AA; for another example, when the thickness of the first isolation structure 200 is greater than that of the alignment structure 300, the probe of the optical charge coupled device captures the reflectivity of the surface of the first isolation structure 200 away from the substrate 100 (it can be understood that the reflectivity of the alignment structure 300 in the plane is 0), and compares the in-plane reflectivity, so as to obtain the position of the alignment mark area S1, and further obtain the edge position of the display area AA.

[0125] In one embodiment, referring to Figure 1 The first isolation structure 200 comprises a first part 201 and a second part 202 which are stacked, the first part 201 is located on the side of the second part 202 away from the substrate 100, and the orthographic projection of the second part 202 on the substrate 100 is located within the orthographic projection of the first part 201 on the substrate 100. Exemplarily, the second part 202 can be designed as an independent film layer, that is, there is no physical interface in the second part 202, and each part is composed of the same material, for example, the material of the second part 202 is aluminum. Alternatively, the second part 202 can be designed as being composed of at least two stacked film layers. For example, the second part 202 is formed by stacking two conductive film layers. The materials of the two conductive film layers can be molybdenum and aluminum respectively, and the conductive film layer composed of molybdenum is located between the substrate 100 and the conductive film layer composed of aluminum. Exemplarily, the second part 202 comprises a conductive subpart, or the second part 202 itself is a conductive structure. The second part 202 and the first electrode layer 410 of the light emitting device 400 are overlapped, so that the first electrode layers 410 of the adjacent light emitting devices 400 are electrically connected to each other, thereby realizing the full-area cathode. The material of the first part 201 can be an organic material or an inorganic material or a metal material. In the case where the first part 201 is a metal material, the material of the first part 201 can be titanium.

[0126] Optionally, the alignment structure 300 comprises a third part 301 and a fourth part 302, the third part 301 is located on the side of the fourth part 302 away from the substrate 100, and the orthographic projection of the fourth part 302 on the substrate 100 overlaps the orthographic projection of the third part 301 on the substrate 100; the reflectivity of the third part 301 is different from the reflectivity of the first part 201.

[0127] For example, the orthographic projection of the fourth part 302 on the substrate 100 is located within the orthographic projection of the third part 301 on the substrate 100. The alignment structure 300 and the first isolation structure 200 can be prepared by the same preparation process.

[0128] For example, the first isolation structure 200 and the alignment structure 300 can be prepared by the same preparation process and by using the same material. For example, the first part 201 and the third part 301 are arranged in the same layer, and the second part 202 and the fourth part 302 are arranged in the same layer. For example, the reflectivity of the third part 301 is greater than the reflectivity of the first part 201. At this time, when the display panel is aligned, the probe of the optical charge coupled device captures the reflectivity of the surface of the first part 201 and the third part 301 away from the plane of the substrate 100, and the reflectivity of the first part 201 and the third part 301 is different, thereby facilitating the determination of the boundary of the display area AA.

[0129] In one embodiment, referring to Figure 6 The first isolation structure 200 further comprises a fifth part 203 located on the side of the second part 202 close to the substrate 100, and the orthographic projection of the second part 202 on the substrate 100 is located within the orthographic projection of the fifth part 203 on the substrate 100.

[0130] Optionally, the third part 301 and the second part 202 are arranged in the same layer, and the fourth part 302 and the fifth part 203 are arranged in the same layer. For example, the orthographic projection of the third part 301 on the substrate 100 is located within the orthographic projection of the fourth part 302 on the substrate 100.

[0131] For example, the material of the third part 301 is the same as the material of the second part 202, and the material of the fourth part 302 is the same as the material of the fifth part 203. For example, the material of the third part 301 comprises aluminum, and the material of the first part 201 comprises titanium. At this time, the thickness of the first isolation structure 200 is greater than the alignment structure 300, and the reflectivity of the first isolation structure 200 is less than the reflectivity of the alignment structure 300.

[0132] It should be noted that the reflectivity herein refers to the reflectivity of the surface of the film layer away from the substrate 100. For example, the reflectivity of the third part 301 refers to the reflectivity of the surface of the third part 301 away from the substrate 100.

[0133] It should be noted that the thickness herein refers to the thickness in the direction perpendicular to the plane where the substrate 100 is located. Taking the thickness of the first isolation structure 200 as an example, the thickness of the first isolation structure 200 refers to the thickness of the first isolation structure 200 in the direction perpendicular to the plane where the substrate 100 is located, or the distance from the surface of the first isolation structure 200 away from the substrate 100 to the substrate 100 in the direction perpendicular to the plane where the substrate 100 is located.

[0134] Exemplarily, the thickness of the third part 301 is less than or equal to the thickness of the second part 201.

[0135] In one embodiment, referring to FIG. 1, the alignment structure 300 further includes a sixth part 303 located on the side of the fourth part 302 close to the substrate 100, the orthographic projection of the fourth part 302 on the substrate 100 is located within the orthographic projection range of the sixth part 303 on the substrate 100, and the orthographic projection of the fourth part 302 on the substrate 100 is located within the orthographic projection range of the third part 301 on the substrate 100. Figure 7

[0136] Optionally, the first part 201 and the third part 301 are disposed in the same layer, the second part 202 and the fourth part 302 are disposed in the same layer, and the fifth part 203 and the sixth part 303 are disposed in the same layer. In this way, the first isolation structure 200 and the alignment structure 300 can be prepared by the same preparation process. At this time, the reflectivity of the first part 201 is different from the reflectivity of the third part 301, for example, the first part 201 and the third part 301 can be prepared by using different materials.

[0137] In one embodiment, referring to FIG. 1, the alignment structure 300 further includes a sixth part 303 located on the side of the fourth part 302 close to the substrate 100, the orthographic projection of the fourth part 302 on the substrate 100 is located within the orthographic projection range of the sixth part 303 on the substrate 100, and the orthographic projection of the fourth part 302 on the substrate 100 is located within the orthographic projection range of the third part 301 on the substrate 100. Figure 8 ​The cross-sectional structure schematic diagram of the display panel is shown, the first isolation structure 200 includes a first part 201 and a second part 202 which are stacked, the first part 201 is located on the side of the second part 202 away from the substrate 100, and the orthographic projection of the second part 202 on the substrate 100 is located in the orthographic projection range of the first part 201 on the substrate 100; the alignment structure 300 includes a seventh part 304, a third part 301 and a fourth part 302 which are stacked, the third part 301 is located on the side of the fourth part 302 away from the substrate 100, the orthographic projection of the fourth part 302 on the substrate 100 and the orthographic projection of the third part 301 on the substrate 100 overlap, the orthographic projection of the seventh part 304 on the substrate 100 and the orthographic projection of the third part 301 on the substrate 100 overlap, the first part 201 and the third part 301 are provided in the same layer, and the second part 202 and the fourth part 302 are provided in the same layer; the reflectivity of the seventh part 304 is different from the reflectivity of the first part 201. At this time, the thickness of the first isolation structure 200 is less than the thickness of the alignment structure 300. Exemplarily, the reflectivity of the seventh part 304 is greater than the reflectivity of the first part 201; for example, when the display panel is aligned, the probe of the optical charge coupled device captures the reflectivity of the plane where the surface of the seventh part 304 away from the substrate 100 is located, at this time, the reflectivity of the plane corresponding to the first part 201 is 0, thereby facilitating the determination of the boundary of the display area AA; for another example, when the display panel is aligned, the probe of the optical charge coupled device captures the reflectivity of the plane where the surface of the first part 201 away from the substrate 100 is located, at this time, the reflectivity of the plane corresponding to the third part 301 is 0, thereby facilitating the determination of the boundary of the display area AA.

[0138] For example, the material of the seventh part 304 includes aluminum, and the material of the first part 201 includes titanium.

[0139] Optionally, the edge of the orthographic projection of the alignment structure 300 on the substrate 100 near the display area AA extends along the edge of the display area AA in the circumferential direction. In this way, the edge of the orthographic projection of the alignment structure 300 on the substrate 100 extends in the circumferential direction by a suitable length, and the edge is almost arranged in a straight line, which is more conducive to the probe capturing the position of the alignment structure 300.

[0140] Optionally, the alignment structure 300 is provided adjacent to the display area AA. Since the alignment structure 300 and the first isolation structure 200 have different structures, when the alignment structure 300 is provided adjacent to the display area AA, it is beneficial to accurately identify the position of the alignment structure 300, thereby improving the accuracy of the obtained boundary of the display area AA.

[0141] It can be understood that, when the alignment structure 300 is prepared, the alignment structure 300 has a preset distance from the edge of the display area AA to the display area AA, and after the probe of the optical charge coupled device is captured to the edge of the display area AA extending in a straight line, the position of the edge is calculated with the preset distance to obtain the boundary of the display area AA; the alignment structure 300 is arranged adjacent to the display area AA to improve the accuracy of the preset distance, and then to improve the accuracy of the obtained boundary of the display area AA.

[0142] It can be understood that, since the material of the alignment structure 300 is the same as that of the first isolation structure 200, the alignment structure 300 has conductivity and can be used as a shielding layer to prevent interference between the panel-in-gate driving signal line (GiP signal line) and the touch trace line (TP trace line) in the substrate 100.

[0143] For example, the orthographic projection of the alignment structure 300 on the substrate 100 coincides with the orthographic projection of the frame area NA on the substrate 100. Thus, the effect of shielding the interference between the panel-in-gate driving signal line (GiP signal line) and the touch trace line (TP trace line) is excellent.

[0144] In one embodiment, referring to Figure 4 , the display panel further comprises a non-alignment identification area S2, and the non-alignment identification area S2 is located on at least part of the periphery of the display area AA. For example, in the frame area NA, the area outside the alignment identification area S1 can be the non-alignment identification area S2.

[0145] Optionally, referring to Figure 9 , the cross-sectional structure diagram of the display panel, the display panel further comprises a second isolation structure 600 located in the non-alignment identification area S2, and the second isolation structure 600 is arranged in the same layer as the first isolation structure 200. It can be understood that the second isolation structure 600 and the first isolation structure 200 are prepared by the same preparation process.

[0146] Optionally, the second isolation structure 600 surrounds a plurality of second isolation openings 610, and the display panel further comprises a redundant light emitting device 700, at least part of the redundant light emitting device 700 is located in the second isolation opening 610, and at least part of the redundant light emitting device 700 is overlapped with the second isolation structure 600. For example, the second redundant light emitting device 700 comprises a third conductive layer 710, a third light emitting functional layer 720 and a fourth conductive layer 730, and the fourth conductive layer 730 is overlapped with the second isolation structure 600. Thus, the second isolation structure 600 is conductive, and after being overlapped with the fourth conductive layer 730, it can be used as a shielding layer to prevent interference between the gate driving signal line (GiP signal line) and the touch trace line (TP trace line) in the substrate 100.

[0147] Optionally, the redundant light-emitting device 700 is arranged in the same layer as the light-emitting device 400. For example, the third light-emitting functional layer 720 is arranged in the same layer as the first light-emitting functional layer 420, the third conductive layer 710 is arranged in the same layer as the first electrode layer 410, and the fourth conductive layer 730 is arranged in the same layer as the second electrode layer 430. The light-emitting device 400 and the redundant light-emitting device 700 can be prepared by using the same preparation process.

[0148] Optionally, the alignment structure 300 is electrically connected to the second isolation structure 600.

[0149] For example, the alignment structure 300 is electrically connected to the first isolation structure 200.

[0150] In one embodiment, with reference to Figure 1 The display panel can further include a pixel definition layer 1000 between the first isolation structure 200 and the alignment structure 300 and the substrate 100. In the display area AA, the pixel definition layer 1000 surrounds a plurality of pixel openings 1100, and the orthographic projection of the pixel opening 1100 on the substrate 100 is located within the orthographic projection range of the first isolation opening 210 on the substrate 100. In the alignment mark area S1, the orthographic projection of the alignment structure on the substrate 100 is located within the orthographic projection range of the pixel definition layer 1000 on the substrate 100.

[0151] It can be understood that, when the first electrode layer 410 is prepared, an electrode material layer is prepared in the display area AA and the frame area NA, and the electrode material layer is patterned to obtain the first electrode layer 410 in the display area AA and the first conductive layer 310 in the alignment mark area S1. The first conductive layer 310 includes a plurality of sub-conductive layers 311, and the orthographic projection of the pixel definition layer 1000 on the substrate 100 covers the orthographic projection of the plurality of sub-conductive layers 311 on the substrate 100. For example, the number of the plurality of sub-conductive layers 311 is at least two.

[0152] For example, the alignment structure 300 extends in a direction away from the display area AA, and the orthographic projection of the alignment structure 300 on the substrate 100 covers the orthographic projection of the plurality of sub-conductive layers 311 on the substrate 100.

[0153] Exemplarily, the substrate 100 can be a substrate substrate. In some embodiments, the substrate substrate can be a glass-based substrate. In some embodiments, the substrate substrate can include an organic resin material such as epoxy, triazine, silicone or polyimide. For example, the substrate substrate can be a FR4 type printed circuit board (PCB), or can be a flexible PCB that is easy to deform. In some embodiments, the substrate substrate can include a ceramic material such as silicon nitride, aluminum nitride or aluminum trioxide, or include a metal or a metal compound. For example, the substrate substrate can be a metal core printed circuit board (MCPCB) or a metal copper clad laminate (MCCL).

[0154] For example, the substrate 100 includes a gate driving signal line (GiP signal line), and in the frame area NA, the GiP signal line is prone to interference with the touch trace; in the frame area NA of one embodiment of the present application, the alignment structure 300 is connected with the first isolation structure 200 and the second isolation structure 600, the second isolation structure 600 is overlapped with the redundant light emitting device 700, the entire frame area forms a conductive layer, which is beneficial to avoid interference between the GiP signal line and the touch trace.

[0155] It should be noted that, in this paper, the film layers arranged in the same layer can be prepared by the same process, or the film layers arranged in the same layer can be prepared by the same preparation process and using the same material.

[0156] It should be noted that, Figures 1-9 In the middle, Figure 1 , Figure 6 , Figure 7 , Figure 8 may be Figure 4 In the middle, the cross-sectional structure schematic diagram along the direction of AA' can be, Figure 9 may be Figure 4 In the middle, the cross-sectional structure schematic diagram along the direction of BB' can be.

[0157] The second aspect of the present application provides a display panel, referring to Figure 1 The display panel includes a display area AA and an alignment mark area S1, and the alignment mark area S1 is located on at least part of the circumferential side of the display area AA.

[0158] Optionally, the display panel further includes a frame area NA, and the frame area NA at least partially surrounds the display area AA, and the alignment mark area S1 is located in the frame area NA. Therefore, the setting of the alignment mark area S1 hardly affects the display effect of the display panel.

[0159] Optionally, the display panel comprises: a substrate 100, a first isolation structure 200, an alignment structure 300, and a plurality of light emitting devices 400.

[0160] Optionally, the first isolation structure 200 is located on one side of the substrate 100 and in the display area AA, and the first isolation structure 200 surrounds a plurality of first isolation openings 210; at least part of the light emitting devices 400 are located in the first isolation openings 210.

[0161] Optionally, the alignment structure 300 and the first isolation structure 200 are located on the same side of the substrate 100 and in the alignment mark area S1, and in the first direction x, the width W1 of the alignment structure 300 is greater than the width W2 of the first isolation structure 200 between adjacent first isolation openings 210; the distance from the side of the alignment structure 300 away from the substrate 100 to the substrate 100 is not the same as the distance from the side of the first isolation structure 200 away from the substrate 100 to the substrate. For example, when the distance from the side of the first isolation structure 200 away from the substrate 100 to the substrate is greater than the distance from the side of the alignment structure 300 away from the substrate 100 to the substrate 100, the probe of the optical charge-coupled device can capture the reflectivity of the plane in which the surface of the alignment structure 300 away from the substrate 100 is located (it can be understood that the reflectivity of the first isolation structure 200 in the plane is 0), and the reflectivity in the plane is compared, the position of the alignment mark area S1 can be obtained, and the boundary position of the display area AA can be obtained; for another example, when the distance from the side of the first isolation structure 200 away from the substrate 100 to the substrate is greater than the distance from the side of the alignment structure 300 away from the substrate 100 to the substrate, the probe of the optical charge-coupled device can capture the reflectivity of the plane in which the surface of the first isolation structure 200 away from the substrate 100 is located (it can be understood that the reflectivity of the alignment structure 300 in the plane is 0), and the reflectivity in the plane is compared, the position of the alignment mark area S1 can be obtained, and the edge position of the display area AA can be obtained.

[0162] In one embodiment, referring to Figure 8 , the first isolation structure 200 comprises a first part 201 and a second part 202 stacked, the first part 201 is located on the side of the second part 202 away from the substrate 100, and the orthogonal projection of the second part 202 on the substrate 100 is located within the orthogonal projection of the first part 201 on the substrate 100. The alignment structure 300 comprises a seventh part 304, a third part 301 and a fourth part 302 stacked, the third part 301 is located on the side of the fourth part 302 away from the substrate 100, the orthogonal projection of the fourth part 302 on the substrate 100 and the orthogonal projection of the third part 301 on the substrate 100 overlap, the orthogonal projection of the seventh part 304 on the substrate 100 and the orthogonal projection of the third part 301 on the substrate 100 overlap, the first part 201 and the third part 301 are arranged in the same layer, and the second part 202 and the fourth part 302 are arranged in the same layer. At this time, the thickness of the alignment structure is large.

[0163] In one embodiment, referring to Figure 6 , the first isolation structure 200 includes a first portion 201, a second portion 202 and a fifth portion 203 stacked together, the first portion 201 is located on the side of the second portion 202 away from the substrate 100, the orthographic projection of the second portion 202 on the substrate 100 is within the orthographic projection of the first portion 201 on the substrate 100, and the orthographic projection of the second portion 202 on the substrate 100 is within the orthographic projection of the fifth portion 203 on the substrate 100; the alignment structure 300 includes a third portion 301 and a fourth portion 302 stacked together, the third portion 301 is located on the side of the fourth portion 302 away from the substrate 100, and the orthographic projection of the fourth portion 302 on the substrate 100 overlaps with the orthographic projection of the third portion 301 on the substrate 100; the second portion 202 and the third portion 301 are disposed in the same layer, and the fifth portion 203 and the fourth portion 302 are disposed in the same layer.

[0164] Exemplarily, the thickness of the third portion 301 is less than or equal to the thickness of the second portion 202.

[0165] The third aspect of the present application provides a preparation method of a display panel, referring to Figure 10 the flowchart of the preparation method of the display panel, the preparation method of the display panel includes the following steps.

[0166] S100: preparing a first electrode layer in the display area on one side of the substrate.

[0167] For example, the first electrode layer is prepared in the display area on one side of the substrate, and the first conductive layer is prepared in the alignment mark area at the same time.

[0168] It should be noted that the first electrode layer, the display area, the first conductive layer, the alignment mark area and the substrate are consistent with the previous description, and will not be described in detail here.

[0169] S200: preparing a first isolation structure in the display area and an alignment structure in the alignment mark area on the side of the first electrode layer away from the substrate; the first isolation structure encloses a plurality of first isolation openings, and at least part of the first electrode layer is exposed in the first isolation openings.

[0170] Among them, in the first direction, the width of the alignment structure is greater than the width of the first isolation structure between adjacent first isolation openings; the reflectivity of the alignment structure is different from the reflectivity of the first isolation structure.

[0171] It should be noted that the first isolation structure and the alignment structure are consistent with the previous description, and will not be described in detail here.

[0172] In one embodiment, the step of preparing the first isolation structure on the side of the first electrode layer away from the substrate includes: sequentially preparing a third isolation material layer 23, a second isolation material layer 22 and a first isolation material layer 21 on the side of the first electrode layer 410 away from the substrate 100 in the display area AA and the frame area NA, with reference to Figure 11 ; performing a patterning process on the first isolation material layer 21 to obtain the first part 201, and the first isolation material layer 21 corresponding to the alignment mark area S1 is removed, with reference to Figure 12 ; performing a patterning process on the second isolation material layer 22 and the third isolation material layer 23 to obtain the first isolation structure 200 and the alignment structure 300 (with reference to Figure 6 ). In the processing process, since the width of the second isolation material layer 22 at the position corresponding to the alignment structure is large, the etching liquid will hardly etch through the second isolation material layer 22 at this position in the patterning process, so that the thickness of the third part 301 in the alignment structure 300 is smaller than the thickness of the second part 202 in the first isolation structure 200.

[0173] It should be noted that, Figure 11 and Figure 12 20 in the above represents a pixel defining material layer, which is obtained after a pixel opening is formed in the pixel defining material.

[0174] It should be noted that, in Figure 12 , the first photoresist 30 is used to perform a patterning process on the first isolation material layer 21 to obtain the first part 201.

[0175] S300: sequentially preparing a first light-emitting functional layer and a second electrode layer in the first isolation opening to obtain a plurality of light-emitting devices.

[0176] It should be noted that the light-emitting device is consistent with the description above, and will not be described in detail here.

[0177] Exemplarily, the redundant light-emitting device is prepared in the second isolation opening at the same time when the light-emitting device is prepared.

[0178] It should be noted that the display panel prepared by the preparation method of the embodiment can be combined with the display panel described above as a whole or in part, and will not be described in detail here.

[0179] The fourth aspect of the present application provides a display module, with reference to Figure 13 the cross-sectional structure schematic diagram of the display module, the display module includes a display area AA and a frame area NA, the frame area NA is located on at least part of the circumferential side of the display area AA; the frame area NA includes an alignment mark area S1.

[0180] Optionally, the display module comprises: a substrate 100, a first isolation structure 200, an alignment structure 300, a plurality of light emitting devices 400, and a touch wire 800.

[0181] Optionally, the first isolation structure 200 is located on one side of the substrate 100 and in the display area AA, and the first isolation structure 200 surrounds a plurality of first isolation openings 210; at least part of the light emitting devices 400 are located in the first isolation openings 210.

[0182] Optionally, the alignment structure 300 and the first isolation structure 200 are located on the same side of the substrate 100 and in the alignment mark area S1, and in the first direction x, the width W1 of the alignment structure 300 is greater than the width W2 of the first isolation structure 200 between adjacent first isolation openings 210; the reflectivity of the first isolation structure 200 is different from the reflectivity of the alignment structure 300.

[0183] Optionally, the touch wire 800 is located in the frame area NA, and the orthogonal projection of the touch wire 800 on the substrate 100 partially overlaps the orthogonal projection of the alignment structure 300 on the substrate 100 (see the top view structural schematic diagram of the display module shown in Figure 14 and Figure 15 ). Thus, the setting of the touch wire 800 has less shielding effect on the alignment structure 300, which is beneficial to accurately identifying the alignment mark area S1.

[0184] In one embodiment, the orthogonal projection of the touch wire 800 on the substrate 100 is arranged apart from the orthogonal projection of the edge of the part of the alignment structure 300 close to the display area AA on the substrate 100.

[0185] It can be understood that the length of the exposed alignment structure 300 close to the edge of the display area AA in the area surrounded by the touch wire 800 meets the alignment grabbing length, which can meet the requirements.

[0186] It can be understood that the side of the first isolation structure 200 and the alignment structure 300 away from the substrate has a packaging layer 10, and the packaging layer 10 comprises a first packaging layer 11, a second packaging layer 12, and a third packaging layer 13, the first packaging layer 11 comprises a plurality of packaging portions 111, the packaging portions 111 correspond to the first isolation openings 210, and part of the packaging portions 111 are located in the first isolation openings 210. It should be noted that the packaging layer 10 can be a packaging layer in the prior art, which will not be described in detail here.

[0187] Optionally, referring to the cross-sectional structural schematic diagram of the display module shown in Figure 16 , the display module further comprises: a cover plate 900 located on the side of the touch wire 800 away from the substrate 100, and the orthogonal projection of the cover plate 900 on the substrate 100 covers the orthogonal projection of the display area AA and the frame area NA on the substrate 100.

[0188] It can be understood that the optical adhesive layer 50 can be used to flatten the side of the touch wiring 800 away from the substrate 100, facilitating the bonding of the cover plate 900.

[0189] Optionally, the cover plate 900 includes an ink region 910 and a transparent region 920, the ink region 910 is arranged corresponding to the frame region NA, and the transparent region 920 is arranged corresponding to the display region AA. For example, the orthographic projection of the ink region 910 on the substrate 100 coincides with the orthographic projection of the frame region NA on the substrate 100, and the orthographic projection of the transparent region 920 on the substrate 100 coincides with the orthographic projection of the display region AA on the substrate 100.

[0190] It can be understood that when aligning, the boundary of the transparent region 920 needs to be aligned with the boundary of the display region AA to achieve high-precision bonding of the cover plate 900 and the display panel.

[0191] It should be noted that the display module in this embodiment can be combined with the display panel described above in whole or in part, and will not be described in more detail here.

[0192] It should be noted that, Figure 13 and Figure 16 may be Figure 14 a cross-sectional structure schematic view along the direction of CC'.

[0193] The fifth aspect of the present application provides an alignment method of a display module. Referring to Figure 17 the flowchart of the alignment method of the display module, the alignment method of the display module includes the following steps.

[0194] S400: obtaining a first image of a first surface which is flush with the surface of the alignment structure away from the substrate, and obtaining a second image of the cover plate.

[0195] Wherein, on the first surface, the reflectivity of the first isolation structure is different from the reflectivity of the alignment structure.

[0196] In one embodiment, the first isolation structure includes a first part, a second part and a third part stacked, and the first part is located on the side of the second part away from the substrate; the alignment structure includes a third part and a fourth part stacked, and the third part is located on the side of the fourth part away from the substrate.

[0197] Exemplarily, obtaining the first image of the first surface which is flush with the surface of the alignment structure away from the substrate includes: obtaining the image of the plane which is flush with the surface of the third part away from the substrate. On the first surface, the reflectivity of the second part is different from the reflectivity of the third part, and the first part is further arranged on the side of the second part away from the substrate, so that on the first surface, the reflectivity of the second part is almost 0, and the reflectivity of the third part is relatively high. In the first image, the position corresponding to the third part is relatively bright, and the position corresponding to the first part is relatively dark, facilitating accurate identification of the third part.

[0198] S500: Determine a boundary of the display area or the frame area based on the first image, and determine a boundary of the ink area based on the second image.

[0199] In one embodiment, based on the first image (the schematic diagram of the first image can refer to Figure 18 ) The step of determining the boundary of the display area or the frame area includes: determining the edge of the alignment structure 300 close to the display area AA based on the first image; in a first direction x, fitting the edge located on the same side of the display area AA into a first straight line L1; in a second direction y, fitting the edge located on the same side of the display area AA into a second straight line L2; the first direction x intersects the second direction y; and determining the boundary of the display area AA or the frame area NA based on the first straight line L1 and the second straight line L2.

[0200] Similarly, the reflectivity of the ink area and the transparent area of ​​the cover plate is different, and the boundary of the ink area of ​​the cover plate can be obtained by conventional means. It should be noted that the boundary of the ink area of ​​the cover plate here refers to the boundary of the ink area close to the transparent area.

[0201] S600: Aligning the cover plate and the display panel based on the boundary of the display area or the frame area and the boundary of the ink area.

[0202] It is understandable that, during alignment, the display area of ​​the display panel is set to correspond to the transparent area of ​​the cover plate, and the frame area of ​​the display panel is set to correspond to the ink area of ​​the cover plate.

[0203] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0204] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A display panel, characterized by, The display panel comprises a display area, an alignment mark area and a non-alignment mark area, the alignment mark area is located on at least a part of the circumferential side of the display area, and the non-alignment mark area is located on at least a part of the circumferential side of the display area. The display panel comprises: a substrate; a first isolation structure located on one side of the substrate and in the display area, the first isolation structure surrounds a plurality of first isolation openings; an alignment structure located on the same side of the substrate as the first isolation structure and in the alignment mark area, in a first direction, the width of the alignment structure is greater than the width of the first isolation structure between adjacent first isolation openings; the reflectivity of the first isolation structure is different from the reflectivity of the alignment structure; a plurality of light emitting devices, at least part of the light emitting devices are located in the first isolation opening; a second isolation structure located in the non-alignment mark area, the second isolation structure is provided in the same layer as the first isolation structure, and the second isolation structure surrounds a plurality of second isolation openings; redundant light emitting devices, at least part of the redundant light emitting devices are located in the second isolation opening, and at least part of the redundant light emitting devices overlap with the second isolation structure.

2. The display panel of claim 1, wherein, The reflectivity of the alignment structure is greater than the reflectivity of the first isolation structure. And / or, the thickness of the first isolation structure is different from the thickness of the alignment structure.

3. The display panel of claim 2, wherein, The ratio of the reflectivity of the alignment structure to the reflectivity of the first isolation structure is 2-10.

4. The display panel of claim 2, wherein, The reflectivity of the alignment structure is greater than or equal to 50% and less than or equal to 100%, and the reflectivity of the first isolation structure is greater than or equal to 10% and less than or equal to 40%.

5. The display panel of claim 1, wherein, The first isolation structure comprises a first part and a second part stacked, the first part is located on the side of the second part away from the substrate, and the orthographic projection of the second part on the substrate is located within the orthographic projection of the first part on the substrate; The alignment structure comprises a third part and a fourth part stacked, the third part is located on the side of the fourth part away from the substrate, and the orthographic projection of the fourth part on the substrate overlaps with the orthographic projection of the third part on the substrate; the reflectivity of the third part is different from the reflectivity of the first part.

6. The display panel of claim 5, wherein, The reflectivity of the third part is greater than the reflectivity of the first part. And / or, the first part and the third part are provided in the same layer, and the second part and the fourth part are provided in the same layer.

7. The display panel of claim 5, wherein, The first isolation structure further comprises a fifth part located on the side of the second part close to the substrate, and the orthographic projection of the second part on the substrate is located within the orthographic projection of the fifth part on the substrate.

8. The display panel of claim 7, wherein, The material of the third part is the same as the material of the second part, and / or the material of the fourth part is the same as the material of the fifth part; And / or, the material of the third part comprises aluminum, and the material of the first part comprises titanium.

9. The display panel of claim 7 or 8, wherein, The third part and the second part are provided in the same layer, and the fourth part and the fifth part are provided in the same layer.

10. The display panel of claim 9, wherein, The thickness of the third part is less than or equal to the thickness of the second part.

11. The display panel of claim 7, wherein, The alignment structure further comprises a sixth portion located on a side of the fourth portion close to the substrate, a projection of the fourth portion on the substrate is located within a projection range of the sixth portion on the substrate, and a projection of the fourth portion on the substrate is located within a projection range of the third portion on the substrate.

12. The display panel of claim 11, wherein, The first portion and the third portion are arranged in the same layer, the second portion and the fourth portion are arranged in the same layer, and the fifth portion and the sixth portion are arranged in the same layer.

13. The display panel of claim 1, wherein, The first isolation structure comprises a first portion and a second portion stacked, the first portion is located on a side of the second portion away from the substrate, and a projection of the second portion on the substrate is located within a projection range of the first portion on the substrate. The alignment structure comprises a seventh portion, a third portion and a fourth portion stacked, the third portion is located on a side of the fourth portion away from the substrate, a projection of the fourth portion on the substrate overlaps with a projection of the third portion on the substrate, and a projection of the seventh portion on the substrate overlaps with a projection of the third portion on the substrate; the first portion and the third portion are arranged in the same layer, and the second portion and the fourth portion are arranged in the same layer.

14. The display panel of claim 13, wherein, The reflectivity of the seventh portion is different from the reflectivity of the first portion.

15. The display panel of claim 14, wherein, The reflectivity of the seventh portion is greater than the reflectivity of the first portion.

16. The display panel of claim 1, wherein, The display panel further comprises a frame area at least partially surrounding the display area, and the alignment mark area is located in the frame area.

17. The display panel of claim 16, wherein, In a first direction, the alignment mark area is located on at least one side of the display area; in a second direction, the alignment mark area is located on at least one side of the display area; and the first direction intersects the second direction.

18. The display panel of claim 16 or 17, wherein, A projection of the alignment structure on the substrate coincides with a projection of the frame area on the substrate.

19. The display panel of claim 16 or 17, wherein, An edge of a projection of the alignment structure on the substrate close to the display area extends circumferentially along an edge of the display area. And / or, the alignment structure is arranged adjacent to the display area.

20. The display panel of claim 1, wherein, The display panel further comprises a frame area at least partially surrounding the display area, and the non-alignment mark area is located in the frame area.

21. The display panel of claim 20, wherein, The redundant light emitting device is arranged in the same layer as the light emitting device.

22. The display panel of claim 1, wherein, Further comprising: A pixel definition layer located between the first isolation structure and the alignment structure and the substrate; In the display area, the pixel definition layer surrounds a plurality of pixel openings, and a projection of the pixel opening on the substrate is located within a projection range of the first separation opening on the substrate; In the alignment mark area, a projection of the alignment structure on the substrate is located within a projection range of the pixel definition layer on the substrate.

23. A display panel comprising: The display panel comprises a display area and an alignment mark area, and the alignment mark area is located on at least part of the circumferential side of the display area. The display panel comprises: A substrate; A first isolation structure located on a side of the substrate and in the display area, and the first isolation structure surrounds a plurality of first separation openings; The alignment structure is located on the same side of the substrate as the first isolation structure and is located in the alignment mark area. In a first direction, the width of the alignment structure is greater than the width of the first isolation structure between adjacent first isolation openings. A plurality of light emitting devices, at least part of the light emitting devices are located in the first isolation opening.

24. The display panel of claim 23, wherein, The first isolation structure includes a first part and a second part stacked, the first part is located on the side of the second part away from the substrate, and the orthogonal projection of the second part on the substrate is located within the orthogonal projection of the first part on the substrate. The alignment structure includes a seventh part, a third part and a fourth part stacked, the third part is located on the side of the fourth part away from the substrate, and the orthogonal projection of the fourth part on the substrate overlaps with the orthogonal projection of the third part on the substrate. The orthogonal projection of the seventh part on the substrate overlaps with the orthogonal projection of the third part on the substrate, the first part and the third part are disposed in the same layer, and the second part and the fourth part are disposed in the same layer.

25. The display panel of claim 23, wherein, The first isolation structure includes a first part, a second part and a fifth part stacked, the first part is located on the side of the second part away from the substrate, and the orthogonal projection of the second part on the substrate is located within the orthogonal projection of the first part on the substrate. The orthogonal projection of the second part on the substrate is located within the orthogonal projection of the fifth part on the substrate. The alignment structure includes a third part and a fourth part stacked, the third part is located on the side of the fourth part away from the substrate, and the orthogonal projection of the fourth part on the substrate overlaps with the orthogonal projection of the third part on the substrate. The second part and the third part are disposed in the same layer, and the fifth part and the fourth part are disposed in the same layer.

26. The display panel of claim 25, wherein, The thickness of the third part is less than or equal to the thickness of the second part.

27. A method for preparing a display panel, characterized in that: It includes: A first electrode layer is prepared in a display area on one side of a substrate; A first isolation structure is prepared on the side of the first electrode layer away from the substrate, and an alignment structure is prepared in an alignment mark area. The first isolation structure surrounds a plurality of first isolation openings, and at least part of the first electrode layer is exposed in the first isolation openings; In a first direction, the width of the alignment structure is greater than the width of the first isolation structure between adjacent first isolation openings; and the reflectivity of the alignment structure is different from the reflectivity of the first isolation structure. A first light emitting functional layer and a second electrode layer are sequentially prepared in the first isolation opening to obtain a plurality of light emitting devices.

28. The method of claim 27, wherein, The step of preparing a first isolation structure on the side of the first electrode layer away from the substrate includes: A third isolation material layer, a second isolation material layer and a first isolation material layer are sequentially prepared in the display area and the frame area on the side of the first electrode layer away from the substrate; The first isolation material layer is patterned to obtain a first part, and the first isolation material layer corresponding to the alignment mark area is removed. The second isolation material layer and the third isolation material layer are subjected to a patterning process to obtain the first isolation structure and the alignment structure.

29. A display module, characterized by The display module includes a display area and a frame area, the frame area is located on at least part of the circumferential side of the display area; the frame area includes an alignment mark area; The display module includes: a substrate; a first isolation structure located on one side of the substrate and in the display area, the first isolation structure surrounds a plurality of first isolation openings; an alignment structure located on the same side of the substrate as the first isolation structure and in the alignment mark area, in a first direction, the width of the alignment structure is greater than the width of the first isolation structure between adjacent first isolation openings; the reflectivity of the alignment structure is different from the reflectivity of the first isolation structure; a plurality of light emitting devices, at least part of the light emitting devices are located in the first isolation opening; a touch control trace located in the frame area, the orthogonal projection of the touch control trace on the substrate partially overlaps the orthogonal projection of the alignment structure on the substrate.

30. The display module of claim 29, wherein, The orthogonal projection of the touch control trace on the substrate is spaced apart from the orthogonal projection of part of the alignment structure near the edge of the display area on the substrate.

31. The display module of claim 30, wherein, The display module further includes a cover plate located on the side of the touch control trace away from the substrate, the orthogonal projection of the cover plate on the substrate covers the orthogonal projection of the display area and the frame area on the substrate.

32. The display module of claim 31, wherein, The cover plate includes an ink area and a transparent area, the ink area is arranged corresponding to the frame area, and the transparent area is arranged corresponding to the display area.

33. A method of aligning a display module as claimed in any one of claims 29 to 32, wherein: It includes: acquiring a first image of a first surface flush with the surface of the alignment structure away from the substrate, and acquiring a second image of the cover plate; on the first surface, the reflectivity of the first isolation structure is different from the reflectivity of the alignment structure; based on the first image, the boundary of the display area or the frame area is determined, and based on the second image, the boundary of the ink area is determined; based on the boundary of the display area or the frame area and the boundary of the ink area, the cover plate is aligned with the display panel.

34. The alignment method of claim 33, wherein, The first isolation structure includes a first part, a second part and a third part stacked, the first part is located on the side of the second part away from the substrate; the alignment structure includes a third part and a fourth part stacked, the third part is located on the side of the fourth part away from the substrate; The step of acquiring a first image of a first surface flush with the surface of the alignment structure away from the substrate includes: acquiring an image of a plane flush with the surface of the third part away from the substrate.

35. The alignment method of claim 33, wherein, The step of determining the boundary of the display area or the frame area based on the first image includes: determining the edge of the alignment structure near the display area based on the first image; in a first direction, the edge located on the same side of the display area is fitted as a first straight line; in a second direction, the edge located on the same side of the display area is fitted as a second straight line; the first direction intersects the second direction; based on the first straight line and the second straight line, the boundary of the display area or the frame area is determined.

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