Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device.The display panel comprises a substrate, an isolation structure and a reserved conductive structure, the isolation structure is arranged on one side of the substrate, and a plurality of isolation openings are defined by the isolation structure; the reserved conductive structure is arranged between the substrate and the isolation structure, and the reserved conductive structure is electrically connected with the isolation structure. According to the display panel, the reserved conductive structure is additionally arranged between the isolation structure and the substrate, the reserved conductive structure is electrically connected with the isolation structure, cathode voltage can be provided, when lap joint between the cathode of the light-emitting unit and the isolation structure is poor, the reserved conductive structure can be electrically connected with the cathode, dark spot repair is achieved, and the display effect is improved. Therefore, the reject ratio is reduced and the display performance is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a method for preparing the same, and a display device. Background Art

[0002] Organic Light Emitting Diode (OLED) and flat panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, current OLED display products are prone to dark spot problems and display performance needs to be improved. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a display panel and a preparation method thereof and a display device that are helpful to reduce the dark spot defect rate and improve the display performance.

[0005] Based on the above purpose, the present application provides a display panel, which includes:

[0006] substrate;

[0007] An isolation structure is disposed on one side of the substrate, and the isolation structure encloses a plurality of isolation openings;

[0008] A reserved conductive structure is disposed between the substrate and the isolation structure, and the reserved conductive structure is electrically connected to the isolation structure.

[0009] In one embodiment, the display panel further includes a second electrode, the second electrode is located in the isolation opening, and the second electrode overlaps the isolation structure.

[0010] In one embodiment, the isolation structure includes a support portion and a crown portion, the crown portion is located on a side of the support portion away from the substrate, and an orthographic projection of a side of the support portion close to the crown portion on the substrate is located within an orthographic projection of the crown portion on the substrate; the support portion overlaps the second electrode;

[0011] Preferably, the orthographic projection of the support portion on the substrate is located within the orthographic projection of the reserved conductive structure on the substrate.

[0012] In one embodiment, the reserved conductive structure includes a reserved overlapping portion, and the orthographic projection of the reserved overlapping portion on the substrate is located within the orthographic projection of the second electrode on the substrate;

[0013] Preferably, the orthographic projection of the reserved overlapping portion on the substrate does not overlap with the orthographic projection of the supporting portion on the substrate.

[0014] In one embodiment, the support portion includes a first support portion and a second support portion, and the first support portion is located between the substrate and the second support portion;

[0015] Preferably, the second electrode overlaps the first supporting portion;

[0016] Preferably, the second electrode is also overlapped with the second supporting portion;

[0017] Preferably, the orthographic projection of a side of the second supporting portion close to the first supporting portion on the substrate is located within the orthographic projection of the first supporting portion on the substrate;

[0018] Preferably, the orthographic projection of a side of the second supporting portion close to the first supporting portion on the substrate is located within the orthographic projection of a side of the second supporting portion close to the crown on the substrate;

[0019] Preferably, the first supporting portion and the reserved conductive structure are made of the same material;

[0020] Preferably, the material of the first supporting portion and the reserved conductive structure includes molybdenum;

[0021] Preferably, the material of the second supporting portion includes aluminum;

[0022] Preferably, the material of the crown comprises titanium.

[0023] In one embodiment, the display panel includes a pixel defining layer, and the pixel defining layer is located on a side of the isolation structure close to the reserved conductive structure;

[0024] Preferably, the second electrode is at least partially located on a side of the pixel defining layer away from the substrate;

[0025] Preferably, the pixel defining layer comprises a first via hole, and the reserved conductive structure is electrically connected to the isolation structure through the first via hole;

[0026] Preferably, the orthographic projection of the reserved conductive structure on the substrate is located within the orthographic projection of the pixel defining layer on the substrate;

[0027] Preferably, an orthographic projection of the isolation structure on the substrate is located within an orthographic projection of the pixel defining layer on the substrate.

[0028] In one embodiment, the display panel further includes a covering layer, and the reserved conductive structure is located on a side of the covering layer away from the substrate;

[0029] Preferably, the orthographic projection of the reserved conductive structure on the substrate is located within the orthographic projection of the covering layer on the substrate.

[0030] In one embodiment, the pixel defining layer and the covering layer enclose a plurality of pixel openings, the pixel openings are located within the isolation openings, and the second electrode covers the pixel openings;

[0031] Preferably, the pixel defining layer is located on a side of the cover layer away from the substrate.

[0032] In one embodiment, the display panel further includes a first electrode and a light-emitting functional layer, wherein the first electrode, the light-emitting functional layer and the second electrode are sequentially stacked in a direction away from the substrate to form a light-emitting unit, and the light-emitting functional layer is at least located in the pixel opening;

[0033] Preferably, the covering layer is located on a side of the first electrode away from the substrate;

[0034] Preferably, the covering layer covers the edges of the first electrodes and the gaps between adjacent first electrodes;

[0035] Preferably, the first electrode comprises an anode, and the second electrode comprises a cathode.

[0036] In one embodiment, the side surface of the pixel defining layer for forming the pixel opening includes a smooth curved surface and / or a flat surface;

[0037] Preferably, the side surface of the cover layer used for forming the pixel opening comprises a smooth curved surface and / or a flat surface.

[0038] In one embodiment, at least part of the second electrode is electrically connected to the reserved conductive structure;

[0039] Preferably, the reserved conductive structure includes a reserved overlapping portion, and at least a portion of the second electrode is electrically connected to the reserved overlapping portion.

[0040] In one embodiment, the reserved conductive structure is disposed between the isolation structure corresponding to at least part of the isolation opening and the substrate;

[0041] Preferably, the reserved conductive structure is disposed between the isolation structure corresponding to each isolation opening and the substrate. Based on the same inventive concept, the present application also provides a display panel, comprising:

[0042] substrate;

[0043] An isolation structure is disposed on one side of the substrate, and the isolation structure encloses a plurality of isolation openings;

[0044] A reserved conductive structure is disposed between the substrate and the isolation structure, and the reserved conductive structure is electrically connected to the isolation structure;

[0045] The orthographic projection of a side of the isolation structure close to the reserved conductive structure on the substrate is located within the orthographic projection of the reserved conductive structure on the substrate.

[0046] In one embodiment, the display panel further includes a second electrode, the second electrode is located in the isolation opening, and the second electrode is electrically connected to the reserved conductive structure.

[0047] Based on the same inventive concept, the present application also provides a method for preparing a display panel, which comprises:

[0048] forming a reserved conductive structure on one side of the substrate;

[0049] An isolation structure is formed on a side of the reserved conductive structure away from the substrate; wherein the isolation structure encloses a plurality of isolation openings, and the reserved conductive structure is electrically connected to the isolation structure.

[0050] In one embodiment, an isolation structure is formed on a side of the reserved conductive structure away from the substrate, and then the preparation method further includes:

[0051] A light-emitting unit is formed, wherein the light-emitting unit includes a light-emitting functional layer and a second electrode which are sequentially stacked in a direction away from the substrate; the second electrode and the light-emitting functional layer are located in the isolation opening, and the second electrode overlaps the isolation structure; wherein the reserved conductive structure includes a reserved overlapping portion, the orthographic projection of the reserved overlapping portion on the substrate has no overlap with the orthographic projection of the isolation structure on the substrate close to the reserved conductive structure, and the orthographic projection of the reserved overlapping portion on the substrate is located within the orthographic projection of the second electrode on the substrate.

[0052] In one embodiment, after forming a reserved conductive structure on one side of the substrate, the preparation method includes:

[0053] forming a pixel defining layer on a side of the reserved conductive structure away from the substrate;

[0054] A first via hole is formed on the pixel defining layer, and the isolation structure is formed on a side of the pixel defining layer away from the substrate, so that the isolation structure is electrically connected to the reserved conductive structure through the first via hole.

[0055] In one embodiment, forming an isolation structure on a side of the reserved conductive structure away from the substrate includes:

[0056] forming a first supporting layer, a second supporting layer and a third supporting layer in sequence on one side of the substrate in a direction away from the substrate;

[0057] The third supporting layer, the second supporting layer and the first supporting layer are patterned to form a crown, a second supporting portion and a first supporting portion, respectively, and the first supporting portion, the second supporting portion and the crown form the isolation structure; wherein, the orthographic projection of the side of the second supporting portion close to the first supporting portion on the substrate is located within the orthographic projection of the first supporting portion on the substrate and the orthographic projection of the crown on the substrate, and the orthographic projection of the side of the second supporting portion close to the crown on the substrate is located within the orthographic projection of the crown on the substrate.

[0058] In one embodiment, the preparation method further comprises:

[0059] When the second electrode and the isolation structure are poorly overlapped, electrically connecting the second electrode to the reserved conductive structure;

[0060] Preferably, the step of electrically connecting the second electrode to the reserved conductive structure comprises:

[0061] The pixel definition layer is pierced through by laser irradiation to electrically connect the second electrode to the reserved conductive structure.

[0062] Based on the same inventive concept, the present application also provides a display device, which includes the above-mentioned display panel, or includes a display panel prepared by the above-mentioned display panel preparation method.

[0063] Compared with the prior art, the display panel provided in the present application can provide a cathode voltage by adding a reserved conductive structure between the isolation structure and the substrate. The reserved conductive structure is electrically connected to the isolation structure. When the cathode of the light-emitting unit is poorly overlapped with the isolation structure, the reserved conductive structure can be electrically connected to the cathode to achieve dark spot repair, thereby reducing the defective rate and improving display performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0065] Figure 1 is a schematic diagram of a related display panel;

[0066] Figure 2 A schematic diagram of the structure of a display panel provided in one embodiment of the present application;

[0067] Figure 3 A schematic diagram of a partial structure of a display panel provided in an embodiment of the present application;

[0068] Figure 4 A schematic diagram of a partial structure of a display panel provided in another embodiment of the present application;

[0069] Figure 5 A schematic diagram of the structure of a display panel during preparation provided by another embodiment of the present application;

[0070] Figure 6 A schematic diagram of the structure of a display panel during preparation provided by another embodiment of the present application;

[0071] Figure 7 A schematic diagram of the structure of a display panel during preparation provided by another embodiment of the present application;

[0072] Figure 8 is a flow chart of a method for preparing a display panel in another embodiment of the present application;

[0073] Fig. 9 A schematic diagram of the structure of a display panel provided in another embodiment of the present application.

[0074] Marking Description:

[0075] 100. Display panel;

[0076] 1. Substrate;

[0077] 2. Isolation structure; 21. Isolation opening; 22. Support portion; 221. First support portion; 222. Second support portion; 23. Crown portion;

[0078] 3. Light-emitting unit; 31. First electrode; 32. Light-emitting functional layer; 33. Second electrode;

[0079] 4. Reserve conductive structure; 41. Reserve overlap;

[0080] 5. Covering layer; 51. Pixel opening;

[0081] 6. Pixel defining layer; 61. First via hole. DETAILED DESCRIPTION

[0082] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0083] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0084] Patent applications CN118251982A, 202410864269.8, PCT / CN2024 / 098407, PCT / CN2024 / 102783, PCT / CN2024 / 098217, PCT / CN2024 / 099419, PCT / CN2024 / 099072, CN117979755A, CN11799 8900A, CN117062489A, CN117580403A, CN116583155A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, and CN117500332A record relevant technical solutions of isolation structures, and their contents are incorporated into this application by reference for reference.

[0085] Reference Figure 1 , is a structural schematic diagram of a related display panel, the display panel 100 includes a substrate 1 and an isolation structure 2 arranged on one side of the substrate 1, the isolation structure 2 encloses a plurality of isolation openings 21 for accommodating light-emitting units 3, and adjacent light-emitting units 3 are separated by the isolation structure 2.

[0086] Among them, an isolation structure 2 is set at the gap between the light-emitting units 3 to separate the functional film layers of adjacent light-emitting units 3. In this way, in the evaporation process of multiple functional film layers, it is only necessary to perform full-surface evaporation on the display panel without the need to use a mask plate to evaporate the area where the light-emitting unit is located to form a functional film layer.

[0087] After long-term research, the inventors found that due to the existence of the eaves structure in the isolation structure 2, the cathode layer of the light-emitting unit 3 may not be in sufficient contact with the isolation structure 2 during evaporation, thus affecting the display.

[0088] Based on this, the present application provides a display panel solution, as detailed in the following embodiments.

[0089] Reference Figure 2 As shown, an embodiment of the present application provides a display panel 100 , which includes a substrate 1 , an isolation structure 2 and a reserved conductive structure 4 .

[0090] The isolation structure 2 is disposed on one side of the substrate 1 and encloses a plurality of isolation openings 21. The reserved conductive structure 4 is disposed between the substrate 1 and the isolation structure 2 and is electrically connected to the isolation structure 2.

[0091] The display panel 100 provided in this embodiment adds a reserved conductive structure 4 between the isolation structure 2 and the substrate 1. The reserved conductive structure 4 is electrically connected to the isolation structure 2 and can provide a cathode voltage. With such a configuration, when the cathode of the light-emitting unit 3 is poorly overlapped with the isolation structure 2, the reserved conductive structure 4 can be electrically connected to the cathode to achieve dark spot repair, thereby reducing the defective rate and improving the display performance.

[0092] Specifically, when dark spots occur due to poor cathode overlap, laser technology is used to connect the cathode in the corresponding area to the reserved conductive structure 4 to restore current transmission, so that the pixels that were originally unable to emit light can resume their light-emitting function and eliminate the dark spots, thereby avoiding affecting surrounding pixels and reducing the risk of damage to other parts of the display panel.

[0093] Continue to refer to Figure 2 As shown, in one embodiment, the display panel 100 further includes a second electrode 33 . The second electrode 33 is located in the isolation opening 21 . The second electrode 33 overlaps the isolation structure 2 .

[0094] The second electrode 33 is overlapped with the isolation structure 2, so that the isolation structure 2 connects the second electrodes 33 of different light-emitting units 3, so that the isolation structure 2 and the second electrodes 33 of the light-emitting units 3 form a common electrode for driving. During later repair, the second electrode 33 can be electrically connected to the reserved conductive structure 4.

[0095] Reference Figures 2 to 4 As shown, in some embodiments, the isolation structure 2 includes a support portion 22 and a crown portion 23, the crown portion 23 is located on the side of the support portion 22 away from the substrate 1, and the orthographic projection of the side of the support portion 22 close to the crown portion 23 on the substrate 1 is located within the orthographic projection of the crown portion 23 on the substrate 1.

[0096] Preferably, the support portion 22 overlaps the second electrode 33 .

[0097] Preferably, the orthographic projection of the support portion 22 on the substrate 1 is located within the orthographic projection of the reserved conductive structure 4 on the substrate 1 .

[0098] Among them, at least the portion of the isolation structure 2 away from the substrate 1 is set to be wide at the top and narrow at the bottom, so that the isolation structure 2 can block the light-emitting functional layer 32 of the adjacent light-emitting unit 3, so as to reduce the current crosstalk problem of the adjacent light-emitting unit 3. Furthermore, the second electrode 33 covers the portion of the reserved conductive structure 4 that exceeds the projection range of the support portion 22, and the two can establish an electrical connection, so that the pixel that originally could not emit light normally due to poor cathode overlap can restore the light-emitting function, thereby reducing the dark spot defect.

[0099] Reference Figure 3 As shown, in one embodiment, the reserved conductive structure 4 includes a reserved overlapping portion 41 , and the orthographic projection of the reserved overlapping portion 41 on the substrate 1 is located within the orthographic projection of the second electrode 33 on the substrate 1 .

[0100] Preferably, the orthographic projection of the reserved overlapping portion 41 on the substrate 1 does not overlap with the orthographic projection of the supporting portion 22 on the substrate 1 .

[0101] Among them, the reserved overlap portion 41 is the portion of the reserved conductive structure 4 that exceeds the support portion 22, which can provide a conductive overlap area for later repair. The reserved overlap portion 41 can be electrically connected to the second electrode 33 through laser repair, and the dark spots caused by poor cathode overlap can be repaired in the conductive overlap area, which can reduce the dark spot defect rate.

[0102] Reference Figure 3 As shown, in one embodiment, the support portion 22 includes a first support portion 221 and a second support portion 222, and the first support portion 221 is located between the substrate 1 and the second support portion 222. Preferably, the second electrode 33 overlaps the first support portion 221.

[0103] Preferably, the second electrode 33 is also overlapped with the second supporting portion 222 .

[0104] Preferably, the orthographic projection of a side of the second supporting portion 222 close to the first supporting portion 221 on the substrate 1 is located within the orthographic projection of the first supporting portion 221 on the substrate 1 .

[0105] The second electrode 33 covers a portion of the first support portion 221 and extends to the second support portion 222 .

[0106] Preferably, the orthographic projection of the second support portion 222 close to the first support portion 221 on the substrate 1 is located within the orthographic projection of the second support portion 222 close to the crown portion 23 on the substrate 1. That is, the second support portion 222 is an inverted trapezoidal structure that is wide at the top and narrow at the bottom.

[0107] Preferably, the first supporting portion 221 and the reserved conductive structure 4 are made of the same material.

[0108] Preferably, the material of the first supporting portion 221 and the reserved conductive structure 4 includes molybdenum.

[0109] Preferably, the material of the second supporting portion 222 includes aluminum.

[0110] Preferably, the material of crown 23 comprises titanium.

[0111] In this embodiment, the isolation structure 2 is a three-layer structure. During the preparation of the isolation structure 2, when the second support portion 222 is side-engraved to reduce its size, the first support portion 221 can provide protection to the bottom layer structure and improve the impact of the side engraving on other film layers.

[0112] Of course, in another embodiment, refer to Figure 4 As shown, the support portion 22 can be a single-layer structure. In this case, the isolation structure 2 is a two-layer structure consisting of the support portion 22 and the crown portion 23.

[0113] Reference Figure 2 , Figure 3 As shown, in one embodiment, the display panel 100 further includes a pixel defining layer 6 , and the pixel defining layer 6 is located on a side of the isolation structure 2 close to the reserved conductive structure 4 .

[0114] Preferably, the second electrode 33 is at least partially located on a side of the pixel defining layer 6 away from the substrate 1 .

[0115] The reserved conductive structure 4 is separated from part of the second electrode 33 by the pixel defining layer 6, so that the two can be prevented from directly contacting each other and the electrical interference between different layers can be reduced. When repair is needed, the pixel defining layer 6 can be pierced to connect the originally separated second electrode 33 with the reserved conductive structure 4, so as to repair the dark spot.

[0116] Preferably, the pixel defining layer 6 includes a first via hole 61, and the reserved conductive structure 4 is electrically connected to the isolation structure 2 through the first via hole 61. Specifically, the reserved conductive structure 4 is electrically connected to the isolation structure 2 through the conductive material of the first via hole 61.

[0117] Preferably, the orthographic projection of the reserved conductive structure 4 on the substrate 1 is located within the orthographic projection of the pixel defining layer 6 on the substrate 1 .

[0118] Preferably, the orthographic projection of the isolation structure 2 on the substrate 1 is located within the orthographic projection of the pixel defining layer 6 on the substrate 1 .

[0119] The pixel defining layer 6 is disposed between the reserved conductive structure 4 and the isolation structure 2 , covers the reserved conductive structure 4 , and supports the isolation structure 2 .

[0120] Reference Figure 2 , Figure 3 As shown, in one embodiment, the display panel 100 further includes a covering layer 5 , and the reserved conductive structure 4 is located on a side of the covering layer 5 away from the substrate 1 .

[0121] Preferably, the orthographic projection of the reserved conductive structure 4 on the substrate 1 is located within the orthographic projection of the cover layer 5 on the substrate 1 .

[0122] Reference Figure 2 , Figure 3 As shown, in one embodiment, the pixel defining layer 6 and the covering layer 5 together enclose a plurality of pixel openings 51, the pixel openings 51 correspond to the isolation openings 21 one by one, the pixel openings 51 are located inside the isolation openings 21, and the second electrode 33 covers the pixel openings 51. The pixel defining layer 6 is located on the side of the covering layer 5 away from the substrate 1, and the pixel defining layer 6 and the covering layer 5 together determine the shape and position of the light emitting unit 3, and separate the first electrode 31 from the isolation structure 2 in a direction perpendicular to the substrate 1.

[0123] As shown in reference 2, in one embodiment, the display panel 100 further includes a first electrode 31 and a light-emitting functional layer 32. The first electrode 31, the light-emitting functional layer 32 and the second electrode 33 are sequentially stacked in a direction away from the substrate 1 to form a light-emitting unit 3. The light-emitting functional layer 32 is partially or entirely located in the pixel opening 51, and the first electrode 31 is partially exposed to the pixel opening 51. At the same time, the light-emitting functional layer 32 and the second electrode 33 are located in the isolation opening 21. By configuring different voltages on the first electrode 31 and the second electrode 33, a voltage difference is formed between the first electrode 31 and the second electrode 33, and the light-emitting functional layer 32 is driven to emit light. Optionally, the first electrode 31 is an anode and the second electrode 33 is a cathode.

[0124] Preferably, the cover layer 5 is located on a side of the first electrode 31 away from the substrate 1 .

[0125] Preferably, the covering layer 5 covers the edges of the first electrodes 31 and the gaps between adjacent first electrodes 31 .

[0126] In some embodiments, the side surface of the pixel defining layer 6 for forming the pixel opening 51 is a smooth curved surface or a flat surface, specifically a flat surface inclined at a certain angle; of course, part of it may be a smooth curved surface and part of it may be a flat surface.

[0127] Preferably, the side surface of the cover layer 5 for forming the pixel opening 51 includes a smooth curved surface and / or a flat surface.

[0128] Specifically, part of the side surface of the cover layer 5 and the side surface of the pixel defining layer 6 form a smooth side wall of the pixel opening 51 , and the second electrode 33 extends outward from the pixel opening 51 along the smooth side wall and overlaps the isolation structure 2 .

[0129] In one embodiment, when at least a portion of the second electrode 33 is poorly overlapped with the isolation structure 2 , the second electrode 33 is electrically connected to the reserved conductive structure 4 .

[0130] Specifically, laser technology can be used to establish a connection between the second electrode 33 and the reserved conductive structure 4 in the corresponding area to restore current transmission, so that the pixel that originally could not emit light normally can restore the light-emitting function and eliminate the dark spot. In one embodiment, the reserved conductive structure 4 includes a reserved overlap portion 41, and at least part of the second electrode 33 is electrically connected to the reserved overlap portion 41.

[0131] In some embodiments, the isolation openings 21 include a first type of opening, a second type of opening, and a third type of opening. The first type of opening, the second type of opening, and the third type of opening are respectively used to accommodate light-emitting units 3 with different colors of emitted light, thereby enhancing the richness of the display of the display panel 100. Exemplarily, the light-emitting units 3 of different colors include light-emitting units R, light-emitting units B, and light-emitting units G. Furthermore, the first type of openings, the second type of openings, and the third type of openings can be set as needed, and their sizes may be different, and there is no specific limitation. In one embodiment, the above-mentioned reserved conductive structure 4 is arranged between the isolation structure 2 corresponding to at least some of the isolation openings 21 among all the isolation openings 21 and the substrate 1.

[0132] Reference Fig. 9 As shown, based on the same inventive concept, another embodiment of the present application provides a display panel, the display panel 100 includes a substrate 1, an isolation structure 2 and a reserved conductive structure 4. The isolation structure 2 is disposed on one side of the substrate 1, and the isolation structure 2 encloses a plurality of isolation openings 21. The reserved conductive structure 4 is disposed between the substrate 1 and the isolation structure 2, and the reserved conductive structure 4 is electrically connected to the isolation structure 2. Among them, the orthographic projection of the side of the isolation structure 2 close to the reserved conductive structure 4 on the substrate 1 is located within the orthographic projection of the reserved conductive structure 4 on the substrate 1.

[0133] The display panel 100 provided in this embodiment adds a reserved conductive structure 4 between the isolation structure 2 and the substrate 1. The reserved conductive structure 4 is electrically connected to the isolation structure 2 to provide a cathode voltage. The portion of the reserved conductive structure 4 that exceeds the isolation structure 2 serves as a reserved conductive overlapping area. In this way, when the cathode of the light-emitting unit 3 and the isolation structure 2 are poorly overlapped, the reserved conductive structure 4 can be electrically connected to the cathode to achieve dark spot repair, thereby reducing the defective rate and improving the display performance.

[0134] Reference Fig. 9As shown, in one embodiment, the display panel 100 also includes a second electrode 33, the second electrode 33 is located in the isolation opening 21, and the second electrode 33 is electrically connected to the reserved conductive structure 4. Specifically, the display panel 100 can be used for vehicle-mounted display, for example, it can be a vehicle-mounted display screen. Based on the fact that vehicle-mounted display products usually have relatively low pixel per inch (PPI) requirements, an overlapping area between the cathode and the reserved conductive structure 4 is reserved in the pixel area. When a dark spot is generated due to poor cathode overlap in the light-emitting unit corresponding to a certain pixel, the cathode in the reserved area can be electrically connected to the reserved conductive structure 4 by laser.

[0135] Based on the same inventive concept, Figure 8 As shown, another embodiment of the present application provides a method for preparing a display panel, comprising:

[0136] Step S10: forming a reserved conductive structure 4 on one side of the substrate 1, which can be referred to Figure 5 ;

[0137] Step S20, forming an isolation structure 2 on the side of the reserved conductive structure 4 away from the substrate 1; wherein the isolation structure 2 encloses a plurality of isolation openings 21, and the reserved conductive structure 4 is electrically connected to the isolation structure 2, which can be referred to Figure 7 .

[0138] The method for preparing the display panel provided in the present embodiment adds a reserved conductive structure 4 before the isolation structure 2 is formed. The reserved conductive structure 4 is electrically connected to the isolation structure 2 and can provide a cathode voltage. In this way, when the cathode of the light-emitting unit 3 and the isolation structure 2 are poorly overlapped, the reserved conductive structure 4 can be electrically connected to the cathode to achieve dark spot repair, thereby reducing the defective rate and improving the display performance.

[0139] In one embodiment, after forming an isolation structure 2 on a side of the reserved conductive structure 4 away from the substrate 1 in step S20, the method for preparing a display panel further includes:

[0140] Step S30, forming a light-emitting unit 3, the light-emitting unit 3 includes a light-emitting functional layer 32 and a second electrode 33 which are sequentially stacked in a direction away from the substrate 1; the second electrode 33 and the light-emitting functional layer 32 are located in the isolation opening 21, and the second electrode 33 overlaps the isolation structure 2; wherein the reserved conductive structure 4 includes a reserved overlapping portion 41, and the orthographic projection of the reserved overlapping portion 41 on the substrate 1 is located within the orthographic projection of the second electrode 33 on the substrate 1, which can be referred to Figure 2 .

[0141] In one embodiment, after forming a reserved conductive structure 4 on one side of the substrate 1 in step S10, the method for preparing a display panel further includes:

[0142] A pixel defining layer 6 is formed on a side of the reserved conductive structure 4 away from the substrate 1;

[0143] A first via hole 61 is formed on the pixel defining layer 6, and an isolation structure 2 is formed on a side of the pixel defining layer 6 away from the substrate 1, so that the isolation structure 2 is electrically connected to the reserved conductive structure 4 through the first via hole 61. Figure 6 , Figure 7 .

[0144] In one embodiment, step S20 includes:

[0145] Step S21, forming a first supporting layer, a second supporting layer and a third supporting layer in sequence on one side of the substrate 1 in a direction away from the substrate 1;

[0146] Step S22, the third supporting layer, the second supporting layer and the first supporting layer are patterned to form a crown 23, a second supporting portion 222 and a first supporting portion 221 respectively, and the first supporting portion 221, the second supporting portion 222 and the crown 23 form an isolation structure 2; wherein, the orthographic projection of the side of the second supporting portion 222 close to the first supporting portion 221 on the substrate 1 is located within the orthographic projection of the first supporting portion 221 on the substrate 1 and the orthographic projection of the crown 23 on the substrate 1, and the orthographic projection of the side of the second supporting portion 222 close to the crown 23 on the substrate 1 is located within the orthographic projection of the crown 23 on the substrate 1.

[0147] In one embodiment, the method for preparing a display panel further includes:

[0148] When the second electrode 33 is poorly overlapped with the isolation structure 2 , the second electrode 33 is electrically connected to the reserved conductive structure 4 .

[0149] Preferably, the second electrode 33 is electrically connected to the reserved conductive structure 4, including:

[0150] The pixel definition layer 6 is penetrated by laser so that the second electrode 33 is electrically connected to the reserved conductive structure 4. Fig. 9 .

[0151] The specific structure, materials, mechanism, etc. of the display panel 100 prepared in the method for preparing the display panel of this embodiment can refer to the above-mentioned display panel embodiment, and will not be described in detail here.

[0152] Another embodiment of the present application provides a display device, which includes the display panel 100 in the above embodiment. The display device can be on a smart device (such as a mobile phone, VR device, computer, television, car display, etc.).

[0153] The display device in this embodiment adds a reserved conductive structure 4 between the isolation structure 2 and the substrate 1. The reserved conductive structure 4 is electrically connected to the isolation structure 2 to provide a cathode voltage. In this way, when the cathode of the light-emitting unit 3 is poorly overlapped with the isolation structure 2, the reserved conductive structure 4 can be electrically connected to the cathode to achieve dark spot repair, thereby reducing the defective rate and improving the display performance.

[0154] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0155] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0156] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate; An isolation structure is disposed on one side of the substrate, and the isolation structure encloses a plurality of isolation openings; A reserved conductive structure is disposed between the substrate and the isolation structure, and the reserved conductive structure is electrically connected to the isolation structure.

2. The display panel according to claim 1, wherein: The display panel further includes a second electrode, the second electrode is located in the isolation opening, and the second electrode overlaps the isolation structure.

3. The display panel according to claim 2, wherein: The isolation structure comprises a support portion and a crown portion, wherein the crown portion is located on a side of the support portion away from the substrate, and an orthographic projection of a side of the support portion close to the crown portion on the substrate is located within an orthographic projection of the crown portion on the substrate; Preferably, the support portion overlaps the second electrode; Preferably, the orthographic projection of the support portion on the substrate is located within the orthographic projection of the reserved conductive structure on the substrate.

4. The display panel according to claim 3, wherein: The reserved conductive structure includes a reserved overlapping portion, and the orthographic projection of the reserved overlapping portion on the substrate is located within the orthographic projection of the second electrode on the substrate; Preferably, the orthographic projection of the reserved overlapping portion on the substrate does not overlap with the orthographic projection of the supporting portion on the substrate.

5. The display panel according to claim 3, wherein: The support portion includes a first support portion and a second support portion, wherein the first support portion is located between the substrate and the second support portion; Preferably, the second electrode overlaps the first supporting portion; Preferably, the second electrode is also overlapped with the second supporting portion; Preferably, the orthographic projection of a side of the second supporting portion close to the first supporting portion on the substrate is located within the orthographic projection of the first supporting portion on the substrate; Preferably, the orthographic projection of a side of the second supporting portion close to the first supporting portion on the substrate is located within the orthographic projection of a side of the second supporting portion close to the crown on the substrate; Preferably, the first supporting portion and the reserved conductive structure are made of the same material; Preferably, the material of the first supporting portion and the reserved conductive structure includes molybdenum; Preferably, the material of the second supporting portion includes aluminum; Preferably, the material of the crown comprises titanium.

6. The display panel according to claim 2, wherein: The display panel comprises a pixel defining layer, and the pixel defining layer is located on a side of the isolation structure close to the reserved conductive structure; Preferably, the second electrode is at least partially located on a side of the pixel defining layer away from the substrate; Preferably, the pixel defining layer comprises a first via hole, and the reserved conductive structure is electrically connected to the isolation structure through the first via hole; Preferably, the orthographic projection of the reserved conductive structure on the substrate is located within the orthographic projection of the pixel defining layer on the substrate; Preferably, an orthographic projection of the isolation structure on the substrate is located within an orthographic projection of the pixel defining layer on the substrate.

7. The display panel according to claim 6, wherein: The display panel further comprises a covering layer, and the reserved conductive structure is located on a side of the covering layer away from the substrate; Preferably, the orthographic projection of the reserved conductive structure on the substrate is located within the orthographic projection of the covering layer on the substrate.

8. The display panel according to claim 7, wherein: The pixel defining layer and the covering layer enclose a plurality of pixel openings, the pixel openings are located within the isolation openings, and the second electrode covers the pixel openings; Preferably, the pixel defining layer is located on a side of the cover layer away from the substrate.

9. The display panel according to claim 8, wherein: The display panel further includes a first electrode and a light-emitting functional layer, wherein the first electrode, the light-emitting functional layer and the second electrode are sequentially stacked in a direction away from the substrate to form a light-emitting unit, and the light-emitting functional layer is at least located in the pixel opening; Preferably, the covering layer is located on a side of the first electrode away from the substrate; Preferably, the covering layer covers the edges of the first electrodes and the gaps between adjacent first electrodes; Preferably, the first electrode comprises an anode, and the second electrode comprises a cathode.

10. The display panel according to claim 8, wherein: The side surface of the pixel defining layer for forming the pixel opening comprises a smooth curved surface and / or a flat surface; Preferably, the side surface of the cover layer used for forming the pixel opening comprises a smooth curved surface and / or a flat surface.

11. The display panel according to claim 2, wherein: At least part of the second electrode is electrically connected to the reserved conductive structure; Preferably, the reserved conductive structure includes a reserved overlapping portion, and at least a portion of the second electrode is electrically connected to the reserved overlapping portion.

12. The display panel according to claim 1, wherein: The reserved conductive structure is arranged between the isolation structure corresponding to at least part of the isolation opening and the substrate; Preferably, the reserved conductive structure is arranged between the isolation structure corresponding to each isolation opening and the substrate.

13. A display panel, characterized in that: include: substrate; An isolation structure is disposed on one side of the substrate, and the isolation structure encloses a plurality of isolation openings; A reserved conductive structure is disposed between the substrate and the isolation structure, and the reserved conductive structure is electrically connected to the isolation structure; The orthographic projection of a side of the isolation structure close to the reserved conductive structure on the substrate is located within the orthographic projection of the reserved conductive structure on the substrate.

14. The display panel according to claim 13, wherein: The display panel further includes a second electrode, wherein the second electrode is located in the isolation opening and is electrically connected to the reserved conductive structure.

15. A method for preparing a display panel, characterized in that: include: forming a reserved conductive structure on one side of the substrate; An isolation structure is formed on a side of the reserved conductive structure away from the substrate; wherein the isolation structure encloses a plurality of isolation openings, and the reserved conductive structure is electrically connected to the isolation structure.

16. The method for manufacturing a display panel according to claim 15, wherein: After forming an isolation structure on a side of the reserved conductive structure away from the substrate, the preparation method further comprises: A light-emitting unit is formed, wherein the light-emitting unit includes a light-emitting functional layer and a second electrode which are sequentially stacked in a direction away from the substrate; the second electrode and the light-emitting functional layer are located in the isolation opening, and the second electrode overlaps the isolation structure; wherein the reserved conductive structure includes a reserved overlapping portion, the orthographic projection of the reserved overlapping portion on the substrate has no overlap with the orthographic projection of the isolation structure on the substrate close to the reserved conductive structure, and the orthographic projection of the reserved overlapping portion on the substrate is located within the orthographic projection of the second electrode on the substrate.

17. The method for preparing a display panel according to claim 16, characterized in that: After forming a reserved conductive structure on one side of the substrate, the preparation method comprises: forming a pixel defining layer on a side of the reserved conductive structure away from the substrate; A first via hole is formed on the pixel defining layer, and the isolation structure is formed on a side of the pixel defining layer away from the substrate, so that the isolation structure is electrically connected to the reserved conductive structure through the first via hole.

18. The method for preparing a display panel according to claim 15, wherein: The step of forming an isolation structure on a side of the reserved conductive structure away from the substrate comprises: forming a first supporting layer, a second supporting layer and a third supporting layer in sequence on one side of the substrate in a direction away from the substrate; The third supporting layer, the second supporting layer and the first supporting layer are patterned to form a crown, a second supporting portion and a first supporting portion, respectively, and the first supporting portion, the second supporting portion and the crown form the isolation structure; wherein, the orthographic projection of the side of the second supporting portion close to the first supporting portion on the substrate is located within the orthographic projection of the first supporting portion on the substrate and the orthographic projection of the crown on the substrate, and the orthographic projection of the side of the second supporting portion close to the crown on the substrate is located within the orthographic projection of the crown on the substrate.

19. The method for manufacturing a display panel according to claim 17, wherein: The preparation method further comprises: When the second electrode and the isolation structure are poorly overlapped, electrically connecting the second electrode to the reserved conductive structure; Preferably, the step of electrically connecting the second electrode to the reserved conductive structure comprises: The pixel definition layer is pierced through by laser irradiation to electrically connect the second electrode to the reserved conductive structure.

20. A display device, characterized in that: The display device includes the display panel according to any one of claims 1 to 14, or includes a display panel prepared by the method for preparing a display panel according to any one of claims 15 to 19.

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