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; the light-emitting device comprises a substrate, a plurality of isolation structures, a dielectric layer and a plurality of light-emitting units, the light-emitting units are arranged on the side, away from the substrate, of the dielectric layer, the first openings surround the corresponding light-emitting units, and each light-emitting unit comprises a first electrode, a light-emitting layer and a second electrode which are sequentially arranged in a stacked mode in the direction away from the substrate; the light-emitting layers in the adjacent light-emitting units are separated through a first opening; the isolation structure is at least partially located in the first opening, and the second electrode is in lap joint with the side, away from the substrate, of the isolation structure. According to the display panel provided by the invention, the second electrode in the light-emitting unit is in lap joint with the side, away from the substrate, of the isolation structure, the lap joint effect of the second electrode and the isolation structure is improved, the contact resistance is reduced, pixel dark spots caused by poor lap joint are avoided, and the display performance of the display panel 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, the performance of current OLED display products 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 that can improve the cathode overlapping effect and enhance the display performance.

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

[0006] substrate;

[0007] A plurality of isolation structures are disposed on one side of the substrate;

[0008] A dielectric layer is disposed on a side of the isolation structure away from the substrate, and the dielectric layer is provided with a plurality of first openings;

[0009] A plurality of light-emitting units are arranged on a side of at least part of the dielectric layer away from the substrate, the first opening is arranged around the corresponding light-emitting unit, the light-emitting unit comprises a first electrode, a light-emitting layer and a second electrode sequentially stacked in a direction away from the substrate, and the light-emitting layers in adjacent light-emitting units are separated by the first opening;

[0010] The isolation structure is at least partially located in the corresponding first opening, and the second electrode overlaps with a side of the isolation structure away from the substrate.

[0011] In one embodiment, the display panel includes a plurality of the isolation structures, a second opening is formed between adjacent isolation structures, an orthographic projection of the second opening on the substrate is located within an orthographic projection of the first opening on the substrate, and the orthographic projection of the second opening on the substrate at least partially surrounds an orthographic projection of the light emitting unit on the substrate;

[0012] Preferably, the isolation structure includes a first part and a second part, the second electrode overlaps a side of the first part away from the substrate, the light-emitting layer is arranged between the side of the second part away from the substrate and the second electrode, and the second opening is formed between the first part of the isolation structure and the second part adjacent to the isolation structure;

[0013] Preferably, the side of the first portion away from the substrate includes a first region and a second region, the first region is located on a side of the second region away from the second opening, the first region overlaps the second electrode, and the light-emitting layer is disposed between the second region and the second electrode;

[0014] Preferably, the second electrodes in adjacent light-emitting units are separated by the second opening;

[0015] Preferably, the first portion of the isolation structure is electrically connected to the second portion of an adjacent isolation structure through the substrate.

[0016] In one embodiment, the isolation structure includes a first supporting portion and a second supporting portion, wherein the second supporting portion is located on a side of the first supporting portion away from the substrate;

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

[0018] Preferably, the material of the second supporting portion includes titanium.

[0019] In one embodiment, the first supporting portion includes a first sub-supporting portion and a second sub-supporting portion, the first sub-supporting portion is located between the second sub-supporting portion and the substrate, and the orthographic projection of the second sub-supporting portion on the substrate is located within the orthographic projection of the first sub-supporting portion on the substrate;

[0020] Preferably, the material of the first sub-support portion includes at least one of molybdenum and titanium, and the material of the second sub-support portion includes aluminum.

[0021] In one embodiment, the dielectric layer includes a pixel defining layer, the pixel defining layer is located on a side of the isolation structure away from the substrate, the pixel defining layer defines a plurality of pixel openings, the pixel defining layer covers an edge of the first electrode, and the pixel opening exposes the first electrode, and the first opening penetrates the pixel defining layer.

[0022] In one embodiment, the dielectric layer further includes a planarization layer, the planarization layer is located between the pixel definition layer and the substrate, the planarization layer partially covers the isolation structure, and the first opening penetrates the planarization layer.

[0023] In one embodiment, the display panel further includes a first encapsulation layer, and the first encapsulation layer at least covers the second electrode;

[0024] Preferably, the first encapsulation layer covers the first opening and the second electrode;

[0025] Preferably, the display panel further comprises a second encapsulation layer, wherein the second encapsulation layer is located on a side of the first encapsulation layer away from the substrate;

[0026] Preferably, the display panel further comprises a third encapsulation layer, and the third encapsulation layer is located on a side of the second encapsulation layer away from the substrate.

[0027] Based on the same inventive concept, the present application also discloses a method for preparing a display panel, which comprises:

[0028] forming a plurality of isolation structures on one side of the substrate;

[0029] forming a dielectric layer on a side of the isolation structure away from the substrate;

[0030] forming a plurality of first openings on the dielectric layer, wherein the isolation structure is at least partially located in corresponding first openings;

[0031] A light-emitting layer is formed on a side of the dielectric layer away from the substrate, and adjacent light-emitting layers are separated by the first opening;

[0032] A second electrode is formed on a side of the light emitting layer away from the substrate, and the second electrode overlaps with a side of the isolation structure away from the substrate.

[0033] In one embodiment, a second opening is further formed between adjacent isolation structures, the orthographic projection of the second opening on the substrate is located within the orthographic projection of the first opening on the substrate, and the orthographic projection of the second opening on the substrate at least partially surrounds the orthographic projection of the light emitting unit on the substrate;

[0034] Preferably, the isolation structure includes a first part and a second part, the second electrode overlaps a side of the first part away from the substrate, the light-emitting layer is arranged between the side of the second part away from the substrate and the second electrode, and the second opening is formed between the first part of the isolation structure and the second part adjacent to the isolation structure;

[0035] Preferably, the dielectric layer includes a pixel defining layer and a planarization layer, and the dielectric layer is formed on a side of the isolation structure away from the substrate, including:

[0036] a planarizing layer on a side of the isolation structure away from the substrate;

[0037] forming a pixel defining layer on a side of the planarization layer away from the substrate, wherein the pixel defining layer defines a plurality of pixel openings;

[0038] Preferably, the planarization layer includes a first side wall and a second side wall located at the first opening and arranged opposite to each other, the pixel defining layer includes a third side wall and a fourth side wall located at the first opening and arranged opposite to each other, the angle between the plane where the first side wall is located and the substrate is β, the angle between the plane where the third side wall is located and the substrate is θ, and the evaporation angle of the light-emitting layer is α, satisfying β>α>θ;

[0039] Preferably, in the first opening, the dimension of the first portion along the width direction of the first opening away from the substrate is less than or equal to L2, L2 = (H1-H2) / tanα-(H1-H2) / tanβ; wherein H1 is the height of the planarization layer, and H2 is the height of the isolation structure.

[0040] Based on the same inventive concept, the present application also discloses a display device, which includes the above-mentioned display panel or a display panel prepared by the above-mentioned display panel preparation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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.

[0042] Figure 1 is a schematic diagram of a related display panel;

[0043] Figure 2 is a schematic diagram of a hierarchical structure of a related display panel;

[0044] Figure 3 A schematic diagram of a display panel provided in an embodiment of the present application;

[0045] Figure 4 A schematic diagram of the layer structure of a display panel provided in an embodiment of the present application;

[0046] Figure 5A top view of an isolation structure of a display panel provided in an embodiment of the present application;

[0047] Figure 6 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0048] Figure 7 A top view of an isolation structure of a display panel provided by another embodiment of the present application;

[0049] Figure 8 A schematic diagram of an isolation structure of a display panel provided in an embodiment of the present application;

[0050] Fig. 9 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0051] Fig.10 A schematic diagram of an isolation structure of a display panel provided in another embodiment of the present application;

[0052] Fig.11 A flow chart of a method for preparing a display panel is provided for another embodiment of the present application;

[0053] Figures 12a to 12d is a schematic diagram of a method for preparing a display panel in another embodiment of the present application;

[0054] Fig.13 FIG. 4 is a schematic diagram of a method for manufacturing a display panel in another embodiment of the present application.

[0055] Marking Description:

[0056] 100, display panel; 200, evaporation source;

[0057] 1. substrate; 11. first opening; 111. first side wall; 112. second side wall;

[0058] 2. Isolation structure; 21. Isolation opening; 22. Second opening; 23. First part; 231. First area; 232. Second area; 24. Second part; 25. Third part; 26. Fourth part;

[0059] 3. Light-emitting unit; 31. First electrode; 32. Light-emitting layer; 33. Second electrode;

[0060] 5. first supporting portion; 51. first sub-supporting portion; 52. second sub-supporting portion;

[0061] 6. A second supporting portion;

[0062] 7. Dielectric layer; 71. Pixel defining layer; 711. Pixel opening; 712. Third side wall; 713. Fourth side wall; 72. Planarization layer; 721. First side wall; 722. Second side wall. DETAILED DESCRIPTION

[0063] 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.

[0064] 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.

[0065] 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, CN116583135A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, and CN117500332A record relevant technical solutions of the isolation structure 2, and their contents are incorporated into this application by reference for reference.

[0066] Reference Figure 1-2As shown, it is a schematic diagram of the structure of a related display panel, which includes a substrate 1 and an isolation structure 2 arranged on one side of the substrate 1. The isolation structure 2 encloses an isolation opening 21 for accommodating a light-emitting unit 3. Adjacent light-emitting units 3 are separated by the isolation structure 2. The light-emitting units 3 generally include R, G, and B, which are respectively used to emit red light, green light, and blue light. Therefore, the isolation opening 21 also includes multiple types of openings for accommodating different light-emitting units 3. Among them, the light-emitting unit 3 includes a first electrode 31, a light-emitting layer 32, and a second electrode 33, which are stacked and sequentially away from the substrate 1, and the second electrode 33 overlaps the isolation structure 2.

[0067] By setting an isolation structure 2 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 evaporation on the entire surface of 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. Therefore, the process of evaporation using the isolation structure 2 does not need to consider the positioning accuracy during evaporation, so that the gap between the light-emitting units 3 can be designed to be smaller in size to increase the pixel density.

[0068] The second electrode 33 needs to be overlapped with the side wall of the isolation structure 2 to achieve circuit conduction. However, the overlap effect between the second electrode 33 and the isolation structure 2 is currently poor, and there is a risk of dark spots in pixels.

[0069] Based on this, the present application provides a display panel solution, as detailed in the following embodiments.

[0070] Reference Figure 3-Figure 5 As shown, an embodiment of the present application discloses a display panel 100, which includes a substrate 1, a plurality of light-emitting units 3, a plurality of isolation structures 2 and a dielectric layer 7. The dielectric layer 7 is arranged on a side of the isolation structure 2 away from the substrate 1. The dielectric layer 7 is provided with a plurality of first openings 71. The plurality of light-emitting units 3 are arranged on a side of at least a portion of the dielectric layer 7 away from the substrate 1. The first openings 11 are arranged around the corresponding light-emitting units 3. The light-emitting units 3 include a first electrode 31, a light-emitting layer 32 and a second electrode 33 which are sequentially stacked in a direction away from the substrate 1. The light-emitting layers 32 in adjacent light-emitting units 3 are separated by the first openings 11.

[0071] The isolation structure 2 is at least partially located in the corresponding first opening 11 , and the second electrode 33 overlaps a side of the isolation structure 2 away from the substrate 1 .

[0072] After long-term research, the inventors found that the second electrode 33 is usually evaporated on the entire surface of the evaporation source 200. In the actual preparation process, due to the evaporation angle of the evaporation source 200, the isolation structure 2 presents a large upper and small lower structure, which will block the evaporation material during evaporation, resulting in a thinner cathode evaporated below the isolation structure 2, resulting in a poor overlap between the second electrode 33 and the isolation structure 2, and there is a risk of dark pixels. At the same time, the poor etching flatness of the sidewall of the isolation structure 2 will also affect the overlap between the second electrode 33 and the isolation structure 2.

[0073] The display panel 100 provided in this embodiment is provided with a first opening 11 and an isolation structure 2 , wherein the first opening 11 is provided around the corresponding light emitting unit 3 , and the first opening 11 separates the light emitting layer 32 in the adjacent light emitting unit 3 to avoid crosstalk.

[0074] At the same time, the isolation structure 2 is at least partially located in the first opening 11, and the isolation structure 2 overlaps the second electrode 33 in the light-emitting unit 3 with the side of the isolation structure 2 away from the substrate 1. Compared with the solution of overlapping the second electrode 33 with the side wall of the isolation structure 2, the second electrode 33 in this embodiment can be made thicker without the obstruction of the isolation structure, thereby improving the overlapping effect of the second electrode 33 and the isolation structure 2, reducing the contact resistance, avoiding pixel dark spots caused by poor overlapping, and improving the display performance of the display panel 100.

[0075] At the same time, compared with the side wall of the isolation structure 2 , the side of the isolation structure 2 away from the substrate 1 has better flatness and better overlapping effect with the second electrode 33 .

[0076] In a specific embodiment, the first electrode 31 is an anode and the second electrode 33 is a cathode. Different voltages are configured on the first electrode 31 and the second electrode 33 to form a voltage difference between the first electrode 31 and the second electrode 33, thereby generating a current and driving the light-emitting layer 32 to emit light.

[0077] Please continue to refer to Figure 4 As shown, in one embodiment, a second opening 22 is formed between adjacent isolation structures 2, and the orthographic projection of the second opening 22 on the substrate 1 is located within the orthographic projection of the first opening 11 on the substrate 1, and the orthographic projection of the second opening 22 on the substrate 1 surrounds the orthographic projection of the light emitting unit 3 on the substrate 1. The second opening 22 is used to separate the light emitting layer 32 in adjacent light emitting units 3.

[0078] Please refer to Figure 4 and 5As shown, in one embodiment, the isolation structure 2 includes a first part 23 and a second part 24, the second electrode 33 overlaps the side of the first part 23 away from the substrate 1, a light-emitting layer 32 is arranged between the side of the second part 24 away from the substrate 1 and the second electrode 33, and a second opening 22 is formed between the first part 23 of the isolation structure 2 and the second part 24 of the adjacent isolation structure 2 to isolate the light-emitting layer 32 in the adjacent light-emitting unit 3.

[0079] The light-emitting layer 32 is evaporated on the entire surface. By controlling the evaporation angle, the light-emitting layer 32 is evaporated on the side of the second portion 24 away from the substrate 1 and is not evaporated on the side of the first portion 23 away from the substrate 1 .

[0080] Please continue to refer to Figure 5 , the isolation structure 2 also includes a third part 25 and a fourth part 26 , and the first part 23 , the second part 24 , the third part 25 and the fourth part 26 are connected at the ends to form a ring.

[0081] In a specific embodiment, in one of the embodiments, the orthographic projection of the light-emitting unit 3 on the substrate 1 is a first rectangle, the orthographic projection of the isolation structure 2 on the substrate 1 is a second rectangle, the first rectangle is located within the second rectangle, and when the light-emitting layer 32 is evaporated, it is evaporated from one side of the rectangle, so that the light-emitting layer 32 can be evaporated on the side of the second part 24 away from the substrate 1, but not evaporated on the side of the first part 23 away from the substrate 1.

[0082] Reference Figure 6 and 7 As shown, in one embodiment, the side of the first portion 23 away from the substrate 1 includes a first region 231 and a second region 232, the first region 231 is located on the side of the second region 232 away from the second opening 22, the first region 231 overlaps with the second electrode 33, and a light-emitting layer 32 is provided between the second region 232 and the second electrode 232. At this time, the light-emitting layers 32 of different light-emitting units 3 are separated by the second opening 22. Since the light-emitting layer 32 evaporated to the second region 232 is disconnected from other regions, it will not affect the light-emitting layers 32 in other regions. At the same time, it is ensured that the side of the first portion 23 away from the substrate 1 can have a second electrode 33 with a large enough area to ensure the overlapping effect.

[0083] In a specific embodiment, the first portion 23 of the isolation structure 2 and the second portion 24 of the adjacent isolation structure 2 are electrically connected through the substrate 1, and the second electrode 33 is connected in series through the isolation structure 2, so that the isolation structure 2 and the second electrode 33 constitute a common electrode for driving. In another embodiment, the first portion 23 of the isolation structure 2 and the second portion 24 of the adjacent isolation structure 2 can be connected to the second power line VSS respectively, and driven respectively. The second power line VSS is connected to the second power supply voltage, and the second power supply voltage can be a negative voltage or 0V.

[0084] In one embodiment, the display panel 100 further includes a first encapsulation layer, which covers the second electrode 33 and is used to protect the second electrode 33. Preferably, the first encapsulation layer covers the first opening 11 and the second electrode 33, and is used to protect the first opening 11 and the second electrode 33. Preferably, the first encapsulation layer is an inorganic layer, and the inorganic layer has high density to isolate water and oxygen.

[0085] In another embodiment, the display panel 100 further includes a second encapsulation layer, which is located on a side of the first encapsulation layer away from the substrate 1, which is beneficial to improving the encapsulation effect. Preferably, the second encapsulation layer is an organic layer, so as to have a greater thickness to flatten the surface of the display panel.

[0086] Furthermore, the display panel 100 further includes a third encapsulation layer, which is located on a side of the second encapsulation layer away from the substrate 1, further improving the encapsulation effect. Preferably, the third encapsulation layer is an inorganic layer, realizing inorganic-organic-inorganic three-layer encapsulation.

[0087] Please continue to refer to Figure 4 As shown, in one embodiment, the dielectric layer 7 includes a pixel defining layer 71, which is located on the side of the isolation structure 2 away from the substrate 1, and the pixel defining layer 71 defines a plurality of pixel openings 711. The pixel defining layer 71 covers the edge of the first electrode 31, and the pixel opening 711 exposes the first electrode 31, and the first opening 11 passes through the pixel defining layer 71.

[0088] The pixel defining layer 71 determines the shape and position of the light-emitting unit 3 and separates the first electrode 31 from the isolation structure 2. Thus, the first electrode 31 can have a larger design area without contacting the isolation structure 2, so that the light-emitting unit 3 has a larger effective light-emitting area. At the same time, the first opening 11 penetrates the pixel defining layer 71, dividing the pixel defining layer 71 into independent units, each of which corresponds to a light-emitting unit 3.

[0089] In one embodiment, the dielectric layer 7 further includes a planarization layer 72, the planarization layer 72 is located between the pixel definition layer 71 and the substrate 1, the planarization layer 72 partially covers the isolation structure 2, and the first opening 11 passes through the planarization layer 72. The planarization layer 72 plays a planarization role. Optionally, the planarization layer 72 is an insulating material, which plays an insulating role, and can insulate the isolation structure 2 from the first electrode 31, and insulate the non-contact position between the substrate 1 and the first electrode 31. The first opening 11 passes through the pixel definition layer 71 and the planarization layer 72, so that the side of the isolation structure 2 away from the substrate 1 is at least partially exposed, so as to facilitate the overlap of the second electrode 33.

[0090] Please continue to refer to Figure 8 As shown, in one embodiment, the isolation structure 2 includes a first support portion 5 and a second support portion 6, and the second support portion 6 is located on a side of the first support portion 5 away from the substrate 1, wherein the orthographic projection of the side of the first support portion 5 close to the second support portion 6 on the substrate 1 is located within the orthographic projection of the second support portion 6 on the substrate 1. In this way, the isolation structure 2 forms a T-shaped structure, so that the isolation structure 2 can block the second electrode 33 of the adjacent light-emitting unit 3. The second electrodes 33 of the adjacent light-emitting units 3 are disconnected, so that the first encapsulation layer can completely wrap each second electrode 33 to avoid etching the target light-emitting unit 3 during patterning. Further, the second support portion 6 can be formed by dry etching, and the first support portion 5 can be formed by wet etching, and the different etching rates of different materials are used to form a T-shaped structure.

[0091] Exemplarily, a red light-emitting unit 3 is prepared first, and after the first electrode 31, the red light-emitting layer and the second electrode 33 are evaporated on the entire surface, it is necessary to perform patterning, that is, the first electrode 31, the red light-emitting layer and the second electrode 33 in other areas outside the target red light-emitting area are etched away, and since the second electrodes 33 of adjacent light-emitting units 3 are disconnected and each second electrode 33 is completely wrapped by the first encapsulation layer, the first electrode 31, the red light-emitting layer and the second electrode 33 in the target red light-emitting area can be prevented from being etched. Preferably, the material of the second support portion 6 includes titanium, etc., to ensure good conductivity and good wet etching resistance, so as to form a T-shaped structure.

[0092] Please refer to Fig. 9 and 10 As shown, in one embodiment, the first support portion 5 includes a first sub-support portion 51 and a second sub-support portion 52, the first sub-support portion 51 is located between the second sub-support portion 52 and the substrate 1, and the orthographic projection of the second sub-support portion 52 on the substrate 1 is located within the orthographic projection of the first sub-support portion 51 on the substrate 1. In this way, the isolation structure 2 forms an I-shaped structure, wherein the first sub-support portion 51 is used to increase the adhesion between the second sub-support portion 52 and the substrate 1 to improve the electrical connection effect. Preferably, the material of the first sub-support portion 51 includes molybdenum, titanium, etc., and the material of the second sub-support portion 52 includes aluminum, etc., which can ensure good conductivity.

[0093] Based on the same inventive concept, Fig.11 As shown, another embodiment of the present application discloses a method for preparing a display panel, which includes the following steps:

[0094] Step S10, forming a plurality of isolation structures 2 on one side of the substrate 1; Fig.12a .

[0095] Step S20, forming a dielectric layer 7 on the side of the isolation structure 2 away from the substrate 1; Figure 12b .

[0096] Step S30, forming a plurality of first openings 11 on the dielectric layer 7, wherein the isolation structure 2 is at least partially located in the corresponding first openings 11; Fig.12c .

[0097] Step S40, forming a light-emitting layer 32 on the side of the dielectric layer 7 away from the substrate 1, and separating the light-emitting layers 32 in adjacent light-emitting units 3 by the first opening 11; Fig.12d .

[0098] Step S50, forming a second electrode 33 on a side of the light emitting layer 32 away from the substrate 1, the second electrode 33 overlaps with a side of the isolation structure 2 away from the substrate 1; Figure 4 .

[0099] In the method for preparing the display panel in the present embodiment, a first opening 11 and an isolation structure 2 are formed on one side of a substrate 1, wherein the first opening 11 is arranged around a corresponding light-emitting unit 3, and the first opening 11 separates the light-emitting layer 32 in an adjacent light-emitting unit 3 to avoid crosstalk.

[0100] At the same time, the isolation structure 2 is at least partially located in the first opening 11, and the isolation structure 2 overlaps the second electrode 33 in the light-emitting unit 3 with the side of the isolation structure 2 away from the substrate 1. Compared with the solution of overlapping the second electrode 33 with the side wall of the isolation structure 2, the second electrode 33 in this embodiment can be made thicker without the obstruction of the isolation structure, thereby improving the overlapping effect of the second electrode 33 and the isolation structure 2, reducing the contact resistance, avoiding pixel dark spots caused by poor overlapping, and improving the display performance of the display panel 100.

[0101] In one embodiment, a second opening 22 is further formed between adjacent isolation structures 2, and the orthographic projection of the second opening 22 on the substrate 1 is located within the orthographic projection of the first opening 11 on the substrate 1, and the orthographic projection of the second opening 22 on the substrate 1 at least partially surrounds the orthographic projection of the light-emitting unit 3 on the substrate 1, wherein the second opening 22 is used to isolate the light-emitting layer 32 in the adjacent light-emitting unit 3, referring to Fig. 9 .

[0102] In one embodiment, the isolation structure 2 includes a first portion 23 and a second portion 24, the second electrode 33 overlaps with the side of the first portion 23 away from the substrate 1, a light-emitting layer 32 is disposed between the side of the second portion 24 away from the substrate 1 and the second electrode 33, and a second opening 22 is formed between the first portion 23 of the isolation structure 2 and the second portion 24 of the adjacent isolation structure 2. During preparation, the second electrode 33 overlaps with the side of the first portion 23 away from the substrate 1, and a light-emitting layer 32 is disposed between the side of the second portion 24 away from the substrate 1 and the second electrode 33, referring to Figure 4 .

[0103] In one embodiment, the dielectric layer 7 includes a pixel defining layer 71 and a planarization layer 72. Step S20, forming the dielectric layer 7 on a side of the isolation structure 2 away from the substrate 1, includes the following steps:

[0104] Step S21, planarizing the layer 72 on the side of the isolation structure 2 away from the substrate 1;

[0105] Step S22 , forming a pixel defining layer 71 on a side of the planarization layer 72 away from the substrate 1 , wherein the pixel defining layer 71 defines a plurality of pixel openings 711 .

[0106] Preferably, the planarization layer 72 includes a first side wall 721 and a second side wall 722 located in the first opening 11 and arranged oppositely, the pixel defining layer 71 includes a third side wall 712 and a fourth side wall 713 located in the first opening 11 and arranged oppositely, the angle between the plane where the first side wall 721 is located and the substrate 1 is β, the angle between the plane where the third side wall 712 is located and the substrate 1 is θ, and the evaporation angle of the light-emitting layer 32 is α, satisfying β>α>θ. That is, the light-emitting layer 32 is evaporated on the second side wall 722, the third side wall 712 and the fourth side wall 713, but not on the first side wall 721. At the same time, the light-emitting layer 32 is not evaporated on at least a part of the area on the side of the first portion 23 away from the substrate 1.

[0107] Among them, since the first side wall 721 and the second side wall 722 are formed by etching at the same time, the third side wall 712 and the fourth side wall 713 are formed by etching at the same time, the angle between the plane where the first side wall 721 is located and the substrate 1 is equal to the angle between the plane where the second side wall 722 is located and the substrate 1, and the angle between the plane where the third side wall 712 is located and the substrate 1 is equal to the angle between the plane where the fourth side wall 713 is located and the substrate 1.

[0108] Preferably, in the first opening 11, the dimension of the first portion 23 away from the substrate 1 along the width direction of the first opening 11 (the X direction in the figure) is less than or equal to L2, L2 = (H1-H2) / tanα-(H1-H2) / tanβ; wherein H1 is the height of the planarization layer 72, and H2 is the height of the isolation structure 2. In this way, the light-emitting layer 32 cannot be evaporated on the side of the first portion 23 away from the substrate 1, referring to Fig.12d shown.

[0109] Reference Fig.13 As shown, in another embodiment, in the first opening 11, the dimension of the first portion 23 away from the substrate 1 along the width direction of the first opening 11 is greater than L2. Figure 7 As shown, at this time, the side of the first portion 23 away from the substrate 1 can be divided into a first region 231 and a second region 232. The first region 231 is located on the side of the second region 232 away from the second opening 22. The size of the first region 231 along the width direction of the first opening 11 is equal to L2. The light-emitting layer 32 cannot be evaporated in the first region 231, but can be evaporated in the second region 232. Since the light-emitting layer 32 evaporated to the second region 232 is disconnected from other regions, it will not affect the light-emitting layer 32 in other regions. At the same time, referring to Figure 6 As shown, a side of the first portion 23 away from the substrate 1 may have a second electrode 33 with a sufficiently large area to ensure an overlapping effect.

[0110] In one embodiment, referring to Figure 12b As shown, a planarization layer 72 is first prepared on one side of the substrate 1, the planarization layer 72 covers the isolation structure 2, and then a first electrode 31 is prepared on the side of the planarization layer 72 away from the substrate 1, and then a pixel definition layer 71 is prepared, and then a first opening 11 is formed on the pixel definition layer 71 and the planarization layer 72. In another embodiment, a part of the first opening 11 can be formed after the planarization layer 72 is prepared, and then the pixel definition layer 71 is prepared and another part of the first opening 11 is formed, and the two parts are connected to form a complete first opening 11.

[0111] At the same time, the evaporation angle of the second electrode 33 should be as large as possible to ensure that the second electrode 33 overlaps with the side of the isolation structure 2 away from the substrate 1, and at the same time, it can avoid the second electrode 33 being evaporated to the side wall of the first support portion 5 in the isolation structure 2, thereby disconnecting the second electrodes 33 of adjacent light-emitting units 3.

[0112] The specific structure and materials of the display panel 100 prepared in the display panel preparation method of this embodiment refer to the above-mentioned display panel embodiment, and will not be described again here.

[0113] Another embodiment of the present application discloses 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.).

[0114] In the display device of this embodiment, the display panel 100 is formed by forming a first opening 11 and an isolation structure 2 on one side of the substrate 1, wherein the first opening 11 is arranged around the corresponding light-emitting unit 3, and the first opening 11 isolates the light-emitting layer 32 in the adjacent light-emitting unit 3 to avoid crosstalk. At the same time, the isolation structure 2 is at least partially located in the first opening 11, and the isolation structure 2 overlaps the second electrode 33 in the light-emitting unit 3 with the side of the isolation structure 2 away from the substrate 1. Compared with the solution of overlapping the second electrode 33 with the side wall of the isolation structure 2, the second electrode 33 in this embodiment can be made thicker without the isolation structure blocking, thereby improving the overlapping effect of the second electrode 33 and the isolation structure 2, reducing the contact resistance, avoiding pixel dark spots caused by poor overlapping, and improving the display performance of the display panel 100, thereby improving the performance of the display device.

[0115] 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.

[0116] 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.

[0117] 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; A plurality of isolation structures are disposed on one side of the substrate; A dielectric layer is disposed on a side of the isolation structure away from the substrate, and the dielectric layer is provided with a plurality of first openings; A plurality of light-emitting units are arranged on a side of at least part of the dielectric layer away from the substrate, the first opening is arranged around the corresponding light-emitting unit, the light-emitting unit comprises a first electrode, a light-emitting layer and a second electrode which are sequentially stacked in a direction away from the substrate, and the light-emitting layers in adjacent light-emitting units are separated by the first opening; The isolation structure is at least partially located in the first opening, and the second electrode overlaps a side of the isolation structure away from the substrate.

2. The display panel according to claim 1, wherein: A second opening is formed between adjacent isolation structures, wherein an orthographic projection of the second opening on the substrate is located within an orthographic projection of the first opening on the substrate, and the orthographic projection of the second opening on the substrate at least partially surrounds an orthographic projection of the light emitting unit on the substrate; Preferably, the isolation structure includes a first part and a second part, the second electrode overlaps a side of the first part away from the substrate, the light-emitting layer is arranged between the side of the second part away from the substrate and the second electrode, and the second opening is formed between the first part of the isolation structure and the second part adjacent to the isolation structure; Preferably, the side of the first portion away from the substrate includes a first region and a second region, the first region is located on a side of the second region away from the second opening, the first region overlaps the second electrode, and the light-emitting layer is disposed between the second region and the second electrode; Preferably, the second electrodes in adjacent light-emitting units are separated by the second opening; Preferably, the first portion of the isolation structure is electrically connected to the second portion of an adjacent isolation structure through the substrate.

3. The display panel according to claim 1 or 2, characterized in that: The isolation structure comprises a first supporting portion and a second supporting portion, wherein the second supporting portion is located at a side of the first supporting portion away from the substrate; Wherein, the orthographic projection of a side of the first supporting portion close to the second supporting portion on the substrate is located within the orthographic projection of the second supporting portion on the substrate; Preferably, the material of the second supporting portion includes titanium.

4. The display panel according to claim 3, wherein: The first supporting portion includes a first sub-supporting portion and a second sub-supporting portion, the first sub-supporting portion is located between the second sub-supporting portion and the substrate, and the orthographic projection of the second sub-supporting portion on the substrate is located within the orthographic projection of the first sub-supporting portion on the substrate; Preferably, the material of the first sub-support portion includes at least one of molybdenum and titanium, and the material of the second sub-support portion includes aluminum.

5. The display panel according to claim 1, wherein: The dielectric layer includes a pixel defining layer, which is located on a side of the isolation structure away from the substrate. The pixel defining layer defines a plurality of pixel openings, covers an edge of the first electrode, and allows the pixel openings to expose the first electrode, and the first openings penetrate the pixel defining layer.

6. The display panel according to claim 5, wherein: The display panel further includes a planarization layer, the planarization layer is located between the pixel definition layer and the substrate, the planarization layer partially covers the isolation structure, and the first opening penetrates the planarization layer.

7. The display panel according to claim 1, wherein: The display panel further includes a first encapsulation layer, wherein the first encapsulation layer at least covers the second electrode; Preferably, the first encapsulation layer covers the first opening and the second electrode; Preferably, the display panel further comprises a second encapsulation layer, wherein the second encapsulation layer is located on a side of the first encapsulation layer away from the substrate; Preferably, the display panel further comprises a third encapsulation layer, and the third encapsulation layer is located on a side of the second encapsulation layer away from the substrate.

8. A method for preparing a display panel, characterized in that: include: forming a plurality of isolation structures on one side of the substrate; forming a dielectric layer on a side of the isolation structure away from the substrate; forming a plurality of first openings on the dielectric layer, wherein the isolation structure is at least partially located in corresponding first openings; A light-emitting layer is formed on a side of the dielectric layer away from the substrate, and adjacent light-emitting layers are separated by the first opening; A second electrode is formed on a side of the light emitting layer away from the substrate, and the second electrode overlaps with a side of the isolation structure away from the substrate.

9. The method for preparing a display panel according to claim 8, wherein: A second opening is further formed between adjacent isolation structures, the orthographic projection of the second opening on the substrate is located within the orthographic projection of the first opening on the substrate, and the orthographic projection of the second opening on the substrate at least partially surrounds the orthographic projection of the light emitting unit on the substrate; Preferably, the isolation structure includes a first part and a second part, the second electrode overlaps a side of the first part away from the substrate, the light-emitting layer is arranged between the side of the second part away from the substrate and the second electrode, and the second opening is formed between the first part of the isolation structure and the second part adjacent to the isolation structure; Preferably, the dielectric layer includes a pixel defining layer and a planarization layer, and the dielectric layer is formed on a side of the isolation structure away from the substrate, including: a planarizing layer on a side of the isolation structure away from the substrate; forming a pixel defining layer on a side of the planarization layer away from the substrate, wherein the pixel defining layer defines a plurality of pixel openings; Preferably, the planarization layer includes a first side wall and a second side wall located at the first opening and arranged opposite to each other, the pixel defining layer includes a third side wall and a fourth side wall located at the first opening and arranged opposite to each other, the angle between the plane where the first side wall is located and the substrate is β, the angle between the plane where the third side wall is located and the substrate is θ, and the evaporation angle of the light-emitting layer is α, satisfying β>α>θ; Preferably, in the first opening, the dimension of the first portion along the width direction of the first opening away from the substrate is less than or equal to L2, L2 = (H1-H2) / tanα-(H1-H2) / tanβ; wherein H1 is the height of the planarization layer, and H2 is the height of the isolation structure.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 7 or a display panel manufactured by the method for manufacturing a display panel according to any one of claims 8 to 9.

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