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, a second isolation structure located on the same side of the substrate as the first isolation structure and in an alignment mark area, the second isolation structure surrounding a plurality of second isolation openings, and the reflectivity of the first isolation openings being different from that of the second isolation openings. When the display panel and the cover plate are aligned, the cover plate and the display panel can be precisely laminated, and the alignment accuracy is high.

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 traditional display panel, a fine metal mask (FMM) is usually used to realize the patterning of a light-emitting pixel. 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 traditional 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] a second isolation structure located on the same side of the substrate as the first isolation structure and in the alignment mark area, the second isolation structure surrounding a plurality of second isolation openings;

[0010] The reflectivity of the first isolation openings is different from the reflectivity of the second isolation openings.

[0011] In an embodiment, the display panel further comprises a plurality of light-emitting devices, at least part of the light-emitting devices being located in the first isolation openings.

[0012] The first conductive layer is located between the second isolation structure and the substrate, at least part of the first conductive layer is exposed to the second isolation opening, and the reflectivity of the first conductive layer is different from the reflectivity of the light-emitting device.

[0013] Preferably, the first conductive layer includes a plurality of first sub-conductive layers, the substrate includes a second conductive layer, and adjacent first sub-conductive layers are electrically connected through the second conductive layer.

[0014] Preferably, the display panel further includes a frame area, the frame area at least partially surrounds the display area; and the first conductive layer and the second conductive layer are located in the frame area.

[0015] Preferably, the substrate further includes an insulating layer located between the first conductive layer and the second conductive layer, the insulating layer includes a through hole, the first conductive layer extends to the through hole and is electrically connected with the second conductive layer.

[0016] In an embodiment, the first isolation structure and the second isolation structure are arranged in the same layer.

[0017] Preferably, 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 orthographic projection of the second part on the substrate is located within the orthographic projection of the first part on the substrate.

[0018] The second isolation 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 orthographic projection of the fourth part on the substrate is located within the orthographic projection of the third part on the substrate.

[0019] Preferably, the first isolation structure further includes 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.

[0020] The second isolation structure further includes a sixth part located on the side of the fourth part close to the substrate, and the orthographic projection of the fourth part on the substrate is located within the orthographic projection of the sixth part on the substrate.

[0021] In an embodiment, the display panel further includes a pixel definition layer, in the display area, the pixel definition layer surrounds a plurality of pixel openings, in the alignment mark area, the pixel definition layer surrounds a plurality of first redundant pixel openings, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the first isolation opening on the substrate, and the orthographic projection of the first redundant pixel opening on the substrate is located within the orthographic projection of the second isolation opening on the substrate.

[0022] The first conductive layer is at least partially exposed to the first redundant pixel opening and the second isolation opening in communication.

[0023] In an embodiment, the display panel further includes a frame area, the frame area at least partially surrounds the display area, and the alignment mark area is located in the frame area.

[0024] Preferably, in the first direction, the alignment mark area is located on at least one side of the display area; in the second direction, the alignment mark area is located on at least one side of the display area; the first direction intersects the second direction;

[0025] Preferably, the second isolation opening comprises a first sub-isolation opening, the first sub-isolation opening is adjacent to the edge of the display area and is arranged circumferentially along the edge of the display area.

[0026] Preferably, the normal projection of the first sub-isolation opening on the substrate is located on the same straight line close to the edge of the display area.

[0027] In an embodiment, the light emitting device comprises a first electrode layer, a first light emitting functional layer and a second electrode layer which are sequentially stacked, the first electrode layer is located between the first isolation structure and the substrate, and at least part of the first electrode layer is exposed to the first isolation opening; the first light emitting functional layer and the second electrode layer are located in the first isolation opening.

[0028] The first electrode layer is provided in the same layer as the first conductive layer.

[0029] In an embodiment, the display panel further comprises a non-alignment mark area, the non-alignment mark area is located on at least part of the circumferential side of the display area.

[0030] The display panel further comprises a third isolation structure located in the non-alignment mark area, the third isolation structure is provided in the same layer as the first isolation structure.

[0031] Preferably, the display panel further comprises a frame area, the frame area at least partially surrounds the display area, and the non-alignment mark area is located in the frame area.

[0032] Preferably, the third isolation structure surrounds a plurality of third isolation openings, and the display panel further comprises a redundant light emitting device, at least part of the redundant light emitting device is located in the third isolation opening, and at least part of the redundant light emitting device is overlapped with the third isolation structure.

[0033] Preferably, the redundant light emitting device is provided in the same layer as the light emitting device.

[0034] The second aspect of the present application provides a display panel, the display panel comprises a display area and an alignment mark area, the alignment mark area is located on at least part of the circumferential side of the display area.

[0035] The display panel comprises:

[0036] a substrate;

[0037] a pixel defining layer located on one side of the substrate, the pixel defining layer surrounds a plurality of pixel openings in the display area, and surrounds a plurality of first redundant pixel openings in the alignment mark area.

[0038] a plurality of light emitting devices, at least part of which is located in the pixel opening;

[0039] The first conductive layer is located between the pixel defining layer and the substrate, and at least part of the first conductive layer is exposed to the first redundant pixel opening. The first conductive layer has a reflectivity different from that of the light-emitting device.

[0040] In one embodiment, the first conductive layer includes a plurality of first sub-conductive layers, and the substrate includes a second conductive layer. Adjacent first sub-conductive layers are electrically connected by the second conductive layer.

[0041] Preferably, the substrate further includes an insulating layer located between the first conductive layer and the second conductive layer. The insulating layer includes a through hole, and the first conductive layer extends to the through hole and is electrically connected to the second conductive layer.

[0042] In one embodiment, the first isolation structure and the second isolation structure are further included, and are located on a side of the pixel defining layer away from the substrate. The first isolation structure surrounds a plurality of first isolation openings, and the second isolation structure surrounds a plurality of second isolation openings.

[0043] The first conductive layer is at least partially exposed to the first redundant pixel opening and the second isolation opening.

[0044] The first conductive layer is at least partially exposed to the first redundant pixel opening and the second isolation opening.

[0045] Preferably, the first isolation structure includes a first part and a second part stacked together. The first part is located on a side of the second part away from the substrate, and the second part has a projection on the substrate within a projection range of the first part on the substrate.

[0046] The second isolation structure includes a third part and a fourth part stacked together. The third part is located on a side of the fourth part away from the substrate, and the fourth part has a projection on the substrate within a projection range of the third part on the substrate.

[0047] Preferably, the first isolation structure further includes a fifth part located on a side of the second part close to the substrate, and the second part has a projection on the substrate within a projection range of the fifth part on the substrate.

[0048] The second isolation structure further includes a sixth part located on a side of the fourth part close to the substrate, and the fourth part has a projection on the substrate within a projection range of the sixth part on the substrate.

[0049] The third aspect of the present application provides a preparation method of a display panel, comprising:

[0050] On one side of the substrate, and in the display area, a first electrode layer is prepared, and in the alignment mark area, a first conductive layer is prepared.

[0051] The first isolation structure surrounding a plurality of first isolation openings is prepared on the side of the first electrode layer away from the substrate, and the second isolation structure surrounding a plurality of second isolation openings is prepared on the side of the first conductive layer away from the substrate; at least part of the first electrode layer is exposed to the first isolation openings, and at least part of the first conductive layer is exposed to the second isolation openings.

[0052] The first light-emitting functional layer and the second electrode layer are sequentially prepared in the first isolation openings to obtain a plurality of light-emitting devices, and the reflectivity of the first conductive layer is different from the reflectivity of the light-emitting devices.

[0053] In an embodiment, the step of preparing the first isolation structure surrounding a plurality of first isolation openings on the side of the first electrode layer away from the substrate and preparing the second isolation structure surrounding a plurality of second isolation openings on the side of the first conductive layer away from the substrate comprises:

[0054] The third isolation material layer, the second isolation material layer and the first isolation material layer are sequentially prepared on the side of the first electrode layer away from the substrate in the display area and the frame area.

[0055] The first isolation material layer, 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 second isolation structure.

[0056] The fourth aspect of the present application provides a display module, which comprises a display area and a frame area, and the frame area is located on at least part of the circumferential side of the display area; the frame area comprises an alignment mark area;

[0057] The display module comprises:

[0058] a substrate;

[0059] 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;

[0060] a second isolation structure located on the same side of the substrate as the first isolation structure and in the alignment mark area, the second isolation structure surrounding a plurality of second isolation openings;

[0061] a plurality of light-emitting devices, at least part of which is located in the first isolation opening;

[0062] a first conductive layer located between the second isolation structure and the substrate, at least part of the first conductive layer being exposed to the second isolation opening; the reflectivity of the first conductive layer is different from the reflectivity of the light-emitting devices.

[0063] a touch wiring located in the frame area, and the orthographic projection of the touch wiring on the substrate partially overlaps the orthographic projection of the second isolation structure on the substrate.

[0064] In one embodiment, the second isolation opening includes a first sub-isolation opening, the first sub-isolation opening is adjacent to an edge of the display area and is arranged circumferentially along the edge of the display area; the orthographic projection of the touch trace on the substrate is spaced apart from the orthographic projection of a portion of the first sub-isolation opening on the substrate;

[0065] The cover is located on a side of the touch line facing away from the substrate, wherein the orthographic projection of the cover on the substrate covers the orthographic projection of the display area and the frame area on the substrate;

[0066] Preferably, 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.

[0067] A fifth aspect of the present application provides a method for aligning a display module, comprising:

[0068] Acquire a first image of a first surface flush with a surface of the first conductive layer facing away from the substrate, and acquire a second image of the cover plate; on the first surface, a reflectivity of the first conductive layer is different from a reflectivity of the first electrode layer;

[0069] determining a boundary of the display area or the frame area based on the first image, and determining a boundary of the ink area based on the second image;

[0070] The cover plate is aligned with the display panel based on the boundary of the display area or the frame area and the boundary of the ink area.

[0071] In one embodiment, the second isolation opening includes a first sub-isolation opening, the first sub-isolation opening is adjacent to an edge of the display area and is arranged circumferentially along the edge of the display area;

[0072] The step of determining the boundary of the display area or the frame area based on the first image includes:

[0073] determining, based on the first image, that the first sub-isolation opening is close to an edge of the display area;

[0074] In a first direction, edges on the same side of the display area are fitted into a first straight line; in a second direction, edges on the same side of the display area are fitted into a second straight line; the first direction intersects the second direction;

[0075] A boundary of the display area or the frame area is determined based on the first straight line and the second straight line.

[0076] According to the display panel provided in the embodiment of the present application, the reflectivity of the first conductive layer is different from the reflectivity of the light-emitting device. When the display panel is aligned, the alignment mark area can be clearly identified. For example, when the display panel and the cover plate are aligned, it is beneficial to accurately fit the cover plate and the display panel, and the alignment accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1A cross-sectional structure schematic diagram of a display panel in an embodiment of the present application.

[0078] Figure 2 A top view structure schematic diagram of a display panel in an embodiment of the present application.

[0079] Figure 3 A top view structure schematic diagram of a display panel in another embodiment of the present application.

[0080] Figure 4 A top view structure schematic diagram of a display panel in another embodiment of the present application.

[0081] Figure 5 A cross-sectional structure schematic diagram of a display panel in the prior art.

[0082] Figure 6 A cross-sectional structure schematic diagram of a display panel in another embodiment of the present application.

[0083] Figure 7 A cross-sectional structure schematic diagram of a display panel in another embodiment of the present application.

[0084] Figure 8 A top view structure schematic diagram of a display panel in another embodiment of the present application.

[0085] Figure 9 A cross-sectional structure schematic diagram of a display panel in another embodiment of the present application.

[0086] Figure 10 A flowchart of a preparation method of a display panel in an embodiment of the present application.

[0087] Figure 11 A flowchart of a preparation of a first functional material layer and a first electrode material layer in an embodiment of the present application.

[0088] Figure 12 A cross-sectional structure schematic diagram of a display module in an embodiment of the present application.

[0089] Figure 13 A top view structure schematic diagram of a display module in an embodiment of the present application.

[0090] Figure 14 A top view structure schematic diagram of a display module in another embodiment of the present application.

[0091] Figure 15 A cross-sectional structure schematic diagram of a display module in another embodiment of the present application.

[0092] Figure 16 A flowchart of an alignment method of a display module in an embodiment of the present application.

[0093] Figure 17 FIG. 1 is a structural schematic diagram of a first image in an embodiment of the present application. DETAILED DESCRIPTION

[0094] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than 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 are within the scope of protection of the present application.

[0095] In addition, in order to better illustrate the present application, numerous specific details are given in the following detailed description. 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 well known to those skilled in the art are not described in detail in order to highlight the main ideas of the present application.

[0096] 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.

[0097] In addition, if the terms "first", "second", etc. are used, they are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0098] The first aspect of the present application provides a display panel, referring to Figure 1 FIG. 1 is a cross-sectional structural schematic diagram of a display panel, which includes a display area AA and a positioning mark area S1. The positioning mark area S1 is located on at least a part of the periphery of the display area AA.

[0099] Optionally, the display panel further includes a non-display area NA, which at least partially surrounds the display area AA, and the positioning mark area S1 is located in the non-display area NA. In this way, the setting of the positioning mark area S1 hardly affects the display effect of the display panel.

[0100] Optionally, referring to Figures 2 to 4 FIG. 2 is a top view structural schematic diagram of a display panel, in which, in a first direction x, the positioning mark area S1 is located on at least one side of the display area AA; in a second direction y, the positioning mark area S1 is located on at least one side of the display area AA; and the first direction x intersects the second direction y.

[0101] For example, referring to Figure 2 in the first direction x, the positioning mark area S1 is located on one side of the display area AA; for example, referring to Figure 3 in the second direction y, the positioning mark area S1 is located on one side of the display area AA; and for example, referring to Figure 4In the first direction x, the alignment mark area S1 is located on both sides of the display area AA; in the second direction y, the alignment mark area S1 is located on both sides of the display area AA. It can be understood that as long as the alignment mark area S1 exists, the accurate identification of the display panel can be realized, which is conducive to the accurate alignment of the display panel and the remaining film layers, for example, the accurate alignment of the display panel and the cover plate. It can be understood that the larger the area of the alignment mark area S1 in the frame area NA, the more accurate the alignment.

[0102] For example, the alignment mark area S1 coincides with the frame area NA, and the orthographic projection of the second isolation structure 300 on the substrate 100 coincides with the orthographic projection of the alignment mark area S1 on the substrate 100.

[0103] Optionally, the display panel comprises: a substrate 100, a first isolation structure 200, a second isolation structure 300, a plurality of light emitting devices 400 and a first conductive layer 510.

[0104] 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.

[0105] Optionally, the second isolation structure 300 is located on the same side of the substrate 100 as the first isolation structure 200 and in the alignment mark area S1, and the second isolation structure 300 surrounds a plurality of second isolation openings 310.

[0106] Optionally, the reflectivity of the first isolation opening 210 is different from the reflectivity of the second isolation opening 310. It can be understood that the reflectivity of the first isolation opening 210 is different from the reflectivity of the second isolation opening 310 means that after the same light is irradiated into the first isolation opening 210 and the second isolation opening 310, the reflectivity of the light reflected by the first isolation opening 210 and the second isolation opening 310 is different. For example, the first isolation opening 210 and the second isolation opening 310 have different film layer structures, and the reflectivity of the light to the film layer structures in the first isolation opening 210 and the second isolation opening 310 is different.

[0107] In one embodiment, 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 is located between the first isolation structure 200 and the substrate 100, and at least part of the first electrode layer 410 is exposed to the first isolation opening 210; the light emitting functional layer 420 and the second electrode layer 430 are located in the first isolation opening 210.

[0108] 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).

[0109] Optionally, the first conductive layer 510 is located between the second isolation structure 300 and the substrate 100, at least part of the first conductive layer 510 is exposed to the second isolation opening 310, and the reflectivity of the first conductive layer 510 is different from the reflectivity of the light-emitting device 400. According to the display panel provided in the embodiments of the present application, the reflectivity of the first conductive layer 510 is different from the reflectivity of the light-emitting device 400, and the alignment mark area S1 can be clearly identified when the display panel is aligned. For example, when the display panel is aligned with the cover plate, the cover plate and the display panel can be precisely laminated, and the alignment accuracy is high.

[0110] The inventors of the present application find that in the prior art display panel, referring to Figure 5 The cross-sectional structure diagram of the display panel is shown in the figure, and the first isolation structure 200 is included in the display area AA and the frame area NA, so that the distribution of the isolation structure and the isolation opening of the display area AA and the frame area NA is 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 problem in the prior art is that due to the consistency of the first isolation structure 200 in the display area AA and the frame area NA, the edge of the display area AA or the edge close to the display area AA of the frame area NA cannot be accurately obtained when the display panel is aligned, so that only the appearance of the cover plate and the display panel can be aligned when aligned, and the cutting accuracy of the display panel or the cover plate is poor, which leads to low lamination accuracy, and thus the yield of the display module obtained is low.

[0111] To solve the above problems, the inventors of the present application set a positioning mark area S1 in the frame area NA, and do not set other film layers in the second isolation opening 310 in the positioning mark area S1, so that the first conductive layer 510 is directly exposed in the second isolation opening 310, and the reflectivity of the first conductive layer 510 is different from the reflectivity of the light emitting device 400. When the display panel and the cover plate are positioned, the position of the positioning mark area S1 can be accurately obtained, and then the edge position of the display area AA can be obtained, so that the accurate positioning of the display panel and the cover plate is realized.

[0112] For example, the first electrode layer 410 is provided in the same layer as the first conductive layer 510. For another example, the first electrode layer 410 is made of the same material as the first conductive layer 510. Since the first electrode layer 410 is away from the substrate 100 on the side of the first light emitting functional layer 420 and the second electrode layer 430, the reflectivity of the first conductive layer 510 is greater than the reflectivity of the light emitting device 400.

[0113] In one embodiment, the second isolation structure 300 is provided in the same layer as the first isolation structure 200. Thus, the second isolation structure 300 and the first isolation structure 200 can be prepared by the same preparation process.

[0114] Optionally, referring to Figure 1 The first isolation structure 200 includes a first part 201 and a second part 202, 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. For example, 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 made of the same material, for example, the material of the second part 202 is aluminum. Alternatively, the second part 202 can be designed as a structure 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 made of molybdenum is located between the substrate 100 and the conductive film layer made of aluminum. For example, the second part 202 includes 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 to electrically connect the first electrode layers 410 of adjacent light emitting devices 400 to each other, so as to realize the full-area cathode. The material of the first part 201 can be an organic material, 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.

[0115] Optionally, referring to Figure 7The second isolation structure 300 includes a stacked third portion 301 and a fourth portion 302, the third portion 301 is located on the side of the fourth portion 302 facing away from the substrate 100, and the orthographic projection of the fourth portion 302 on the substrate 100 is located within the range of the orthographic projection of the third portion 301 on the substrate 100.

[0116] For example, the first part 201 and the third part 301 are arranged on the same layer, and the second part 202 and the fourth part 302 are arranged on the same layer.

[0117] Optionally, the first isolation structure 200 further includes a fifth portion 203 located on a side of the second portion 202 close to the substrate 100 , and the orthographic projection of the second portion 202 on the substrate 100 is within the orthographic projection range of the fifth portion 203 on the substrate 100 .

[0118] Optionally, the second isolation structure 300 further includes a sixth portion 303 located on a side of the fourth portion 302 close to the substrate 100, and the orthographic projection of the fourth portion 302 on the substrate 100 is located within the orthographic projection of the sixth portion 303 on the substrate 100. For example, the fifth portion 203 and the sixth portion 303 are disposed on the same layer.

[0119] In one embodiment, referring to Figure 6 In the schematic diagram of the cross-sectional structure of the display panel shown, the first conductive layer 510 includes multiple first sub-conductive layers 511, and the substrate 100 includes a second conductive layer 110. Adjacent first sub-conductive layers 511 are electrically connected via the second conductive layer 110. This facilitates connecting the spaced first sub-conductive layers 511 as a whole, which can serve as a shielding layer to prevent interference between the panel's gate drive signal lines (GiP signal lines) and the touch control traces (TP trace lines) in the substrate 100.

[0120] It can be understood that the gate driving signal line (GiP signal line) in the panel is located on a side of the second conductive layer 110 away from the first sub-conductive layer 511 .

[0121] Optionally, the display panel further includes a frame area NA, which at least partially surrounds the display area AA; the first conductive layer 510 and the second conductive layer 110 are located in the frame area NA.

[0122] For example, the display panel includes a non-display area, the non-display area surrounds the display area AA, and the frame area NA is located in the non-display area.

[0123] Optionally, the substrate 100 further includes an insulating layer located between the first conductive layer 510 and the second conductive layer. The insulating layer includes a through hole. The first conductive layer 510 extends to the through hole and is electrically connected to the second conductive layer.

[0124] In one embodiment, the first sub-conductive layer 511 is in a mesh structure, and the second conductive layer is also in a mesh structure. The first sub-conductive layer 511 and the second conductive layer are electrically connected by wires.

[0125] In one embodiment, referring to Figure 1 , the display panel further includes a pixel defining layer 1000. In the display area AA, the pixel defining layer 1000 surrounds a plurality of pixel openings 1100. In the alignment mark area S1, the pixel defining layer 1000 surrounds a plurality of first redundant pixel openings 1200. The orthographic projection of the pixel openings 1100 on the substrate 100 is located within the orthographic projection range of the first isolation openings 210 on the substrate 100. The orthographic projection of the first redundant pixel openings 1200 on the substrate 100 is located within the orthographic projection range of the second isolation openings 310 on the substrate 100. The first conductive layer 510 is at least partially exposed to the first redundant pixel openings 1200 and the second isolation openings 310. Thus, the first conductive layer 510 exposed in the first redundant pixel openings 1200 and the second isolation openings 310 has different reflectivity from the light emitting device 400.

[0126] For example, the first electrode layer 410 is exposed to the pixel openings 1100 and the first isolation openings 210.

[0127] Optionally, referring to Figure 4 , the second isolation openings 310 include first sub-isolation openings 311. The first sub-isolation openings 311 are adjacent to the edges of the display area AA and are arranged circumferentially along the edges of the display area AA. For example, the orthographic projection of the first sub-isolation openings 311 on the substrate 100 is located on the same straight line close to the edges of the display area AA. For example, in the first direction x, the orthographic projection of the first sub-isolation openings 311 on the substrate 100 located on the same side of the display area AA is located on the same straight line L1 close to the edges of the display area AA. In the second direction y, the orthographic projection of the first sub-isolation openings 311 on the substrate 100 located on the same side of the display area AA is located on the same straight line L2 close to the edges of the display area AA.

[0128] In one embodiment, referring to Figure 7 , a cross-sectional structure schematic diagram of the display panel, and Figure 8 , a top view structure schematic diagram of the display panel, the display panel further includes a non-alignment mark area S2. The non-alignment mark area S2 is located on at least part of the circumferential side of the display area AA. For example, in the frame area NA, the area outside the alignment mark area S1 can be the non-alignment mark area S2.

[0129] Optionally, the non-alignment mark area S2 is located in the frame area NA.

[0130] Optionally, the display panel further comprises a third isolation structure 600 located in the non-alignment mark area S2, and the third isolation structure 600 is arranged in the same layer as the first isolation structure 200.

[0131] For example, the third isolation structure 600 and the first isolation structure 200 are prepared by the same preparation process.

[0132] Optionally, the third isolation structure 600 surrounds a plurality of third 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 third isolation opening 610, and at least part of the redundant light emitting device 700 overlaps with the third isolation structure 600. For example, the 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 overlaps with the third isolation structure 600. Thus, the third isolation structure 600 is conductive, and after overlapping with the fourth conductive layer 730, it can act as a shielding layer to prevent interference between the gate driving signal line (GiP signal line) in the substrate 100 and the touch trace 800 (TP trace line).

[0133] 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 third isolation structure 600 and the redundant light emitting device 700 can be prepared by the same preparation process.

[0134] Optionally, the second isolation structure 300 is electrically connected with the third isolation structure 600. For example, adjacent second isolation structure 300 and third isolation structure 600 overlap through the fourth conductive layer 730.

[0135] For example, the isolation structure between adjacent second isolation opening 310 and third isolation opening 610 is the second isolation structure 300 or the third isolation structure 600.

[0136] 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).

[0137] 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 first conductive layer 510 and the second conductive layer 110 are overlapped, and the third isolation structure 600 and the redundant light emitting device 700 are overlapped, the entire frame area forms a conductive layer, which is beneficial to avoid interference between the GiP signal line and the touch trace.

[0138] 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.

[0139] It should be noted that, Figures 1 to 10 In the middle, Figure 1 , Figure 6 may be Figure 4 In the middle, the cross-sectional structure schematic diagram along the direction of AA' can be, Figure 7 may be Figure 8 In the middle, the cross-sectional structure schematic diagram along the direction of BB' can be.

[0140] The second aspect of the present application provides a display panel, referring to Figure 9 The cross-sectional structure schematic diagram of the display panel is shown, the display panel includes a display area AA and a positioning mark area S1, and the positioning mark area S1 is located on at least part of the circumferential side of the display area AA.

[0141] 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 positioning mark area S1 is located in the frame area NA. Therefore, the setting of the positioning mark area S1 hardly affects the display effect of the display panel.

[0142] Optionally, the display panel includes a substrate 100, a pixel definition layer 1000, a plurality of light emitting devices 400, and a first conductive layer 510.

[0143] Optionally, the pixel defining layer 1000 is located on one side of the substrate 100, and the pixel defining layer 1000 surrounds a plurality of pixel openings 1100 in the display area AA, and surrounds a plurality of first redundant pixel openings 1200 in the alignment mark area S1. At least part of the light emitting device 400 is located in the pixel opening 1100.

[0144] Optionally, the first conductive layer 510 is located between the pixel defining layer 1000 and the substrate 100, and at least part of the first conductive layer 510 is exposed to the first redundant pixel opening 1200. The reflectivity of the first conductive layer 510 is not the same as the reflectivity of the light emitting device 400.

[0145] In an embodiment, the first conductive layer 510 includes a plurality of first sub-conductive layers 511, and the substrate 100 includes a second conductive layer 110. Adjacent first sub-conductive layers 511 are electrically connected by the second conductive layer 110. In this way, the first sub-conductive layers 511 arranged at intervals can be connected as a whole, which can act as a shielding layer to avoid interference between the panel gate driving signal line (GiP signal line) and the touch trace line (TP trace line) in the substrate 100.

[0146] Optionally, the substrate 100 further includes an insulating layer located between the first conductive layer 510 and the second conductive layer. The insulating layer includes a through hole, and the first conductive layer 510 extends to the through hole and is electrically connected to the second conductive layer.

[0147] In a specific embodiment, the first sub-conductive layer 511 is a mesh structure, and the second conductive layer is also a mesh structure. The first sub-conductive layer 511 and the second conductive layer can be electrically connected by a wire.

[0148] In an embodiment, referring to Figure 1 The display panel further includes a first isolation structure 200 and a second isolation structure 300 located on the side of the pixel defining layer 1000 away from the substrate 100. The first isolation structure 200 surrounds a plurality of first isolation openings 210. The second isolation structure 300 surrounds a plurality of second isolation openings 310. 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. The orthographic projection of the first redundant pixel opening 1200 on the substrate 100 is located within the orthographic projection range of the second isolation opening 310 on the substrate 100. The first conductive layer 510 is at least partially exposed to the first redundant pixel opening 1200 and the second isolation opening 310.

[0149] Optionally, referring to Figure 1The 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. For example, the second part 202 can be designed as an independent film layer, i.e., 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. For example, 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 to electrically connect the first electrode layers 410 of the adjacent light emitting devices 400 to each other, thereby realizing the full-area cathode. The material of the first part 201 can be an organic material, 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.

[0150] Optionally, the second isolation structure 300 comprises 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, and 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.

[0151] For example, 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.

[0152] Optionally, 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.

[0153] Optionally, the second isolation structure 300 further comprises a sixth part 303 located on the side of the fourth part 302 close to the substrate 100, and the orthographic projection of the fourth part 302 on the substrate 100 is located within the orthographic projection of the sixth part 303 on the substrate 100. For example, the fifth part 203 and the sixth part 303 are provided in the same layer.

[0154] It should be noted that the display panel of the present embodiment can be combined with the display panel described above as a whole or in part, and details are not repeated here.

[0155] The third aspect of the present application provides a preparation method of a display panel, which refers to Figure 10A flowchart of a preparation method of a display panel is shown. The preparation method of the display panel comprises the following steps.

[0156] S100: A first electrode layer is prepared on one side of a substrate, and a first conductive layer is prepared in an alignment mark area.

[0157] 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.

[0158] S200: A first isolation structure surrounding a plurality of first isolation openings is prepared on a side of the first electrode layer away from the substrate, and a second isolation structure surrounding a plurality of second isolation openings is prepared on a side of the first conductive layer away from the substrate; at least part of the first electrode layer is exposed in the first isolation opening, and at least part of the first conductive layer is exposed in the second isolation opening.

[0159] It should be noted that the first isolation structure and the second isolation structure are consistent with the previous description, and will not be described in detail here.

[0160] In one embodiment, the step of preparing the first isolation structure surrounding a plurality of first isolation openings on a side of the first electrode layer away from the substrate, and preparing the second isolation structure surrounding a plurality of second isolation openings on a side of the first conductive layer away from the substrate comprises: sequentially preparing a third isolation material layer, a second isolation material layer and a first isolation material layer on a side of the first electrode layer away from the substrate in the display area and the frame area; and performing a patterning process on the first isolation material layer, the second isolation material layer and the third isolation material layer to obtain the first isolation structure and the second isolation structure.

[0161] S300: 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.

[0162] The reflectivity of the first conductive layer is different from the reflectivity of the light-emitting device.

[0163] For example, the step of sequentially preparing the first light-emitting functional layer and the second electrode layer in the first isolation opening comprises: sequentially preparing a first light-emitting functional material layer 42 and a second electrode material layer 43 in the first isolation opening 210 and the second isolation opening 310, and the details are described with reference to Figure 11 ; removing the first light-emitting functional material layer 42 and the second electrode material layer 43 in the second isolation opening 310 to expose the first conductive layer 510, and the details are described with reference to Figure 1 .

[0164] It should be noted that the light-emitting device is consistent with the previous description, and will not be described in detail here.

[0165] Illustratively, while the light-emitting device is being prepared, a redundant light-emitting device is prepared in the third isolation opening.

[0166] It should be noted that the display panel prepared by the preparation method of this embodiment can be combined with the display panel described above in whole or in part, and will not be described in detail here.

[0167] The fourth aspect of the present application provides a display module, referring to Figure 12 The cross-sectional structural diagram of the display module shown in FIG. 1 includes a display area AA and a frame area NA. The frame area NA is located at least partially around the display area AA. The frame area NA includes an alignment mark area S1 .

[0168] Optionally, the display module includes: a substrate 100 , a first isolation structure 200 , a second isolation structure 300 , a plurality of light-emitting devices 400 , a first conductive layer 510 and a touch trace 800 .

[0169] Optionally, the first isolation structure 200 is located on one side of the substrate 100 and in the display area AA. The first isolation structure 200 encloses a plurality of first isolation openings 210 ; at least some of the light-emitting devices 400 are located in the first isolation openings 210 .

[0170] Optionally, the second isolation 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 . The second isolation structure 300 encloses a plurality of second isolation openings 310 .

[0171] Optionally, the first conductive layer 510 is located between the second isolation structure 300 and the substrate 100 , at least a portion of the first conductive layer 510 is exposed to the second isolation opening 310 , and the reflectivity of the first conductive layer 510 is different from that of the light emitting device 400 .

[0172] Optionally, the touch line 800 is located in the frame area NA, and the orthographic projection of the touch line 800 on the substrate 100 partially overlaps with the orthographic projection of the second isolation structure 300 on the substrate 100 (see Figure 13 and Figure 14 As a result, the touch trace 800 has a small shielding effect on the first conductive layer 510, which is beneficial for accurately identifying the alignment mark area S1.

[0173] It is understandable that the length of the exposed first conductive layer 510 near the edge of the display area AA in the area enclosed by the touch trace 800 satisfies the alignment and gripping length, thus meeting the requirement.

[0174] It can be understood that the side of the first isolation structure 200 and the second isolation structure 300 away from the substrate has an encapsulation layer 10, and the encapsulation layer 10 includes a first encapsulation layer 11, a second encapsulation layer 12, and a third encapsulation layer 13. The first encapsulation layer 11 includes a plurality of encapsulation portions 111, and the encapsulation portions 111 correspond to the first isolation opening 210 and the second isolation opening 310 and are partially located in the first isolation opening 210 and the second isolation opening 310. It should be noted that the encapsulation layer 10 can be an encapsulation layer in the prior art, and will not be described in detail here.

[0175] In one embodiment, the second isolation opening 310 includes a first sub-isolation opening 311, the first sub-isolation opening 311 is adjacent to the edge of the display area AA and is arranged along the edge of the display area AA in a circumferential direction; and the orthographic projection of the touch wire 800 on the substrate 100 is arranged to be spaced from the orthographic projection of the first sub-isolation opening 311 on the substrate 100.

[0176] Optionally, referring to Figure 15 , the display module further includes a cover plate 900 located on the side of the touch wire 800 away from the substrate 100, and the orthographic projection of the cover plate 900 on the substrate 100 covers the orthographic projection of the display area AA and the non-display area NA on the substrate 100.

[0177] It can be understood that the side of the touch wire 800 away from the substrate 100 can be planarized by using an optical adhesive layer 50, so as to facilitate the bonding of the cover plate 900.

[0178] Optionally, the cover plate 900 includes an ink area 910 and a transparent area 920, the ink area 910 is arranged corresponding to the non-display area NA, and the transparent area 920 is arranged corresponding to the display area AA. For example, the orthographic projection of the ink area 910 on the substrate 100 coincides with the orthographic projection of the non-display area NA on the substrate 100, and the orthographic projection of the transparent area 920 on the substrate 100 coincides with the orthographic projection of the display area AA on the substrate 100.

[0179] It can be understood that when aligning, the boundary of the transparent area 920 needs to be aligned with the boundary of the display area AA to achieve high-precision bonding of the cover plate 900 and the display panel.

[0180] It should be noted that the display module in the present embodiment can be combined with the display panel described above in whole or in part, and will not be described in detail here.

[0181] It should be noted that Figure 12 and Figure 15 may be Figure 13 a cross-sectional structure schematic view along the direction of CC'.

[0182] The fifth aspect of the present application provides an alignment method of a display module, referring to Figure 16The alignment method of the display module includes the following steps.

[0183] S400: Obtain a first image of a first surface of the first conductive layer flush with a surface of the substrate, and obtain a second image of the cover plate.

[0184] The reflectivity of the first conductive layer is different from that of the first electrode layer on the first surface. In the first image, the pattern corresponding to the first conductive layer is brighter, and the pattern corresponding to the first electrode layer is darker.

[0185] S500: Determine the boundary of the display area or the frame area based on the first image, and determine the boundary of the ink area based on the second image.

[0186] In one embodiment, the second isolation opening 310 includes a first sub-isolation opening 311 adjacent to the edge of the display area AA and arranged circumferentially along the edge of the display area AA. The step of determining the boundary of the display area or the frame area based on the first image (the schematic diagram of the first image can be referred to Figure 17 ) includes: determining that the first sub-isolation opening 311 is close to the edge of the display area AA based on the first image; fitting the edges on the same side of the display area AA as a first straight line L1 in a first direction x; fitting the edges on the same side of the display area AA as a second straight line L2 in a second direction y; 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.

[0187] It can be understood that when the second isolation opening 310 is made, the first sub-isolation opening 311 has a preset distance between the edge close to the display area AA and the boundary of the display area AA. After the first straight line L1 and the second straight line L2 are recognized, the positions of the first straight line L1 and the second straight line L2 are operated with the preset distance, and the boundary position of the display area AA can be obtained.

[0188] 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.

[0189] S600: Align 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.

[0190] The above describes the basic principles of the present application in conjunction with specific embodiments, but it should be noted that the advantages, benefits, effects and the like mentioned in the present application are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as necessary for each embodiment of the present application. In addition, the above specific details disclosed are only for the purpose of example and understanding, and are not limiting, and the above details do not limit the present application to be necessarily implemented with the above specific details.

[0191] The foregoing description has been presented for the purposes of illustration and description. Furthermore, the description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although several example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, additions, and sub-combinations of the described aspects and embodiments.

Claims

1. A display panel, characterized in that: The display panel includes a display area and an alignment mark area, wherein the alignment mark area is located at least partially around the display area; The display panel includes: substrate; a first isolation structure, located on one side of the substrate and in the display area, wherein the first isolation structure encloses a plurality of first isolation openings; a second isolation structure, located on the same side of the substrate as the first isolation structure and located in the alignment mark area, the second isolation structure enclosing a plurality of second isolation openings; a plurality of light emitting devices, at least some of which are located in the first isolation opening; A first conductive layer is located between the second isolation structure and the substrate, at least a portion of the first conductive layer is exposed to the second isolation opening, and a reflectivity of the first conductive layer is different from a reflectivity of the light emitting device.

2. The display panel according to claim 1, wherein: The first conductive layer includes a plurality of first sub-conductive layers, the substrate includes a second conductive layer, and adjacent first sub-conductive layers are electrically connected through the second conductive layer.

3. The display panel according to claim 2, wherein: The display panel further includes a frame area, the frame area at least partially surrounding the display area; the first conductive layer and the second conductive layer are located in the frame area; And / or, the substrate further includes an insulating layer located between the first conductive layer and the second conductive layer, the insulating layer includes a through hole, and the first conductive layer extends to the through hole and is electrically connected to the second conductive layer.

4. The display panel according to claim 1, wherein: The first isolation structure and the second isolation structure are arranged on the same layer; And / or, the first isolation structure includes a first portion and a second portion stacked together, the first portion is located on a side of the second portion facing away from the substrate, and an orthographic projection of the second portion on the substrate is located within the orthographic projection of the first portion on the substrate; The second isolation structure includes a third portion and a fourth portion stacked together. The third portion is located on a side of the fourth portion facing away from the substrate. The orthographic projection of the fourth portion on the substrate is within the orthographic projection range of the third portion on the substrate.

5. The display panel according to claim 4, wherein: The first isolation structure further includes a fifth portion located on a side of the second portion close to the substrate, wherein an orthographic projection of the second portion on the substrate is within the orthographic projection range of the fifth portion on the substrate; The second isolation structure further includes a sixth portion located on a side of the fourth portion close to the substrate, and an orthographic projection of the fourth portion on the substrate is within a range of an orthographic projection of the sixth portion on the substrate.

6. The display panel according to claim 2, wherein: The display panel further includes a pixel defining layer, wherein in the display area, the pixel defining layer encloses a plurality of pixel openings, and in the alignment mark area, the pixel defining layer encloses a plurality of first redundant pixel openings, wherein the orthographic projections of the pixel openings on the substrate are located within the orthographic projection range of the first isolation openings on the substrate, and the orthographic projections of the first redundant pixel openings on the substrate are located within the orthographic projection range of the second isolation openings on the substrate; The first conductive layer is at least partially exposed to the first redundant pixel opening and the second isolation opening that are in communication with each other.

7. The display panel according to claim 1, wherein: The display panel further includes a frame area, which at least partially surrounds the display area, and the alignment mark area is located in the frame area.

8. The display panel according to claim 7, 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; the first direction intersects with the second direction; And / or, the second isolation opening includes a first sub-isolation opening, and the first sub-isolation opening is adjacent to the edge of the display area and is arranged circumferentially along the edge of the display area.

9. The display panel according to claim 8, wherein: The orthographic projections of the first sub-isolating openings on the substrate are located on a same straight line close to the edge of the display area.

10. The display panel according to claim 2, wherein: The light-emitting device includes a first electrode layer, a first light-emitting functional layer, and a second electrode layer stacked in sequence, wherein the first electrode layer is located between the first isolation structure and the substrate, and at least a portion of the first electrode layer is exposed to the first isolation opening; The first light-emitting functional layer and the second electrode layer are located in the first isolation opening; The first electrode layer and the first conductive layer are arranged in the same layer.

11. The display panel according to claim 2, wherein: The display panel further includes a non-alignment mark area, and the non-alignment mark area is located at least partially around the display area; The display panel further includes a third isolation structure located in the non-alignment mark area, and the third isolation structure is provided in the same layer as the first isolation structure.

12. The display panel according to claim 11, wherein: The display panel further includes a frame area, the frame area at least partially surrounding the display area, and the non-alignment mark area is located in the frame area; And / or, the third isolation structure encloses a plurality of third isolation openings, the display panel further includes redundant light-emitting devices, at least some of the redundant light-emitting devices are located in the third isolation openings, and at least some of the redundant light-emitting devices overlap the third isolation structure.

13. The display panel according to claim 12, wherein: The redundant light emitting device is arranged on the same layer as the light emitting device.

14. A display panel, characterized in that: The display panel includes a display area and an alignment mark area, wherein the alignment mark area is located at least partially around the display area; The display panel includes: substrate; A pixel defining layer is located on one side of the substrate, wherein the pixel defining layer encloses a plurality of pixel openings in the display area and a plurality of first redundant pixel openings in the alignment mark area; a plurality of light emitting devices, at least partially located in the pixel opening; The first conductive layer is located between the pixel defining layer and the substrate. At least a portion of the first conductive layer is exposed to the first redundant pixel opening. The reflectivity of the first conductive layer is different from that of the light emitting device.

15. The display panel according to claim 14, wherein: The first conductive layer includes a plurality of first sub-conductive layers, the substrate includes a second conductive layer, and adjacent first sub-conductive layers are electrically connected through the second conductive layer.

16. The display panel according to claim 15, wherein: The substrate further includes an insulating layer located between the first conductive layer and the second conductive layer. The insulating layer includes a through hole. The first conductive layer extends to the through hole and is electrically connected to the second conductive layer.

17. The display panel according to claim 14, wherein: The first isolation structure and the second isolation structure are located on a side of the pixel defining layer facing away from the substrate, the first isolation structure enclosing a plurality of first isolation openings, and the second isolation structure enclosing a plurality of second isolation openings; The orthographic projection of the pixel opening on the substrate is within the orthographic projection range of the first isolation opening on the substrate, and the orthographic projection of the first redundant pixel opening on the substrate is within the orthographic projection range of the second isolation opening on the substrate; The first conductive layer is at least partially exposed to the first redundant pixel opening and the second isolation opening that are in communication with each other.

18. The display panel according to claim 17, wherein: The first isolation structure includes a first portion and a second portion stacked together, the first portion is located on a side of the second portion facing away from the substrate, and an orthographic projection of the second portion on the substrate is within the orthographic projection of the first portion on the substrate; The second isolation structure includes a third portion and a fourth portion stacked together. The third portion is located on a side of the fourth portion facing away from the substrate. The orthographic projection of the fourth portion on the substrate is within the orthographic projection range of the third portion on the substrate.

19. The display panel according to claim 18, wherein: The first isolation structure further includes a fifth portion located on a side of the second portion close to the substrate, wherein an orthographic projection of the second portion on the substrate is within the orthographic projection range of the fifth portion on the substrate; The second isolation structure further includes a sixth portion located on a side of the fourth portion close to the substrate, and an orthographic projection of the fourth portion on the substrate is within a range of an orthographic projection of the sixth portion on the substrate.

20. A method for preparing a display panel, characterized in that: include: On one side of the substrate, a first electrode layer is formed in the display area, and a first conductive layer is formed in the alignment mark area; A first isolation structure is formed on a side of the first electrode layer facing away from the substrate to enclose a plurality of first isolation openings, and a second isolation structure is formed on a side of the first conductive layer facing away from the substrate to enclose a plurality of second isolation openings; At least a portion of the first electrode layer is exposed in the first isolation opening, and at least a portion of the first conductive layer is exposed in the second isolation opening; 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, wherein the reflectivity of the first conductive layer is different from that of the light-emitting devices.

21. The preparation method according to claim 20, characterized in that The step of preparing a first isolation structure enclosing a plurality of first isolation openings on a side of the first electrode layer facing away from the substrate, and preparing a second isolation structure enclosing a plurality of second isolation openings on a side of the first conductive layer facing away from the substrate comprises: On a side of the first electrode layer facing away from the substrate, a third isolation material layer, a second isolation material layer, and a first isolation material layer are sequentially formed in the display area and the frame area; The first isolation material layer, the second isolation material layer and the third isolation material layer are patterned to obtain the first isolation structure and the second isolation structure.

22. A display module, characterized in that: The display module includes a display area and a frame area, wherein the frame area is located at least partially around the display area; the frame area includes an alignment mark area; The display module includes: substrate; a first isolation structure, located on one side of the substrate and in the display area, wherein the first isolation structure encloses a plurality of first isolation openings; a second isolation structure, located on the same side of the substrate as the first isolation structure and located in the alignment mark area, the second isolation structure enclosing a plurality of second isolation openings; a plurality of light emitting devices, at least some of which are located in the first isolation opening; a first conductive layer located between the second isolation structure and the substrate, at least a portion of the first conductive layer being exposed to the second isolation opening; a reflectivity of the first conductive layer being different from a reflectivity of the light-emitting device; A touch line is located in the frame area, and an orthographic projection of the touch line on the substrate partially overlaps with an orthographic projection of the second isolation structure on the substrate.

23. The display module according to claim 22, wherein: The second isolation opening includes a first sub-isolation opening, the first sub-isolation opening is adjacent to an edge of the display area and arranged circumferentially along the edge of the display area; the orthographic projection of the touch trace on the substrate is spaced apart from the orthographic projection of part of the first sub-isolation opening on the substrate; It also includes: a cover plate, located on the side of the touch line away from the substrate, and the orthographic projection of the cover plate on the substrate covers the orthographic projections of the display area and the frame area on the substrate.

24. The display module according to claim 23, 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.

25. A method for aligning a display module, characterized in that: The display module includes a display panel, the display panel includes a display area and an alignment mark area, and the alignment mark area is located at least partially around the display area; The display panel includes: substrate; a first isolation structure, located on one side of the substrate and in the display area, wherein the first isolation structure encloses a plurality of first isolation openings; a second isolation structure, located on the same side of the substrate as the first isolation structure and located in the alignment mark area, the second isolation structure enclosing a plurality of second isolation openings; a plurality of light-emitting devices, at least some of which are located in the first isolation opening; the light-emitting devices include a first electrode layer, a first light-emitting functional layer, and a second electrode layer stacked in sequence, the first electrode layer being located between the first isolation structure and the substrate, and at least some of the first electrode layer being exposed to the first isolation opening; the first light-emitting functional layer and the second electrode layer being located in the first isolation opening; a first conductive layer, located between the second isolation structure and the substrate, at least a portion of the first conductive layer being exposed to the second isolation opening, the reflectivity of the first conductive layer being different from the reflectivity of the light-emitting device; and the first electrode layer being disposed on the same layer as the first conductive layer; The alignment method of the display module includes: Acquire a first image of a first surface flush with a surface of the first conductive layer facing away from the substrate, and acquire a second image of the cover plate; on the first surface, a reflectivity of the first conductive layer is different from a reflectivity of the first electrode layer; determining a boundary of a display area or a frame area based on the first image, and determining a boundary of an ink area based on the second image; The cover plate is aligned with the display panel based on the boundary of the display area or the frame area and the boundary of the ink area.

26. The alignment method according to claim 25, characterized in that: The second isolation opening includes a first sub-isolation opening, wherein the first sub-isolation opening is adjacent to an edge of the display area and is arranged circumferentially along the edge of the display area; The step of determining the boundary of the display area or the frame area based on the first image includes: determining, based on the first image, that the first sub-isolation opening is close to an edge of the display area; In a first direction, the edges located on the same side of the display area are fitted into a first straight line; in a second direction, the edges located on the same side of the display area are fitted into a second straight line; the first direction intersects the second direction; A boundary of the display area or the frame area is determined based on the first straight line and the second straight line.

Images