Display panels and electronic devices

Abstract

The embodiments of the present application provide a display panel and electronic device, relating to the field of display technology. The display panel includes a substrate, a pixel defining layer, an isolation structure, and multiple light-emitting units. The pixel defining layer is located on one side of the substrate and defines multiple pixel openings. The isolation structure is located on a side of the pixel defining layer away from the substrate and encloses multiple isolation openings. The isolation openings are connected to corresponding pixel openings. At least a portion of the light-emitting unit is disposed on a side of the substrate facing away from the pixel defining layer. The light-emitting unit includes a first electrode, and the pixel openings partially expose the first electrode. The pixel defining layer has multiple steps connected in sequence on the side away from the substrate in a direction away from the substrate, and at least a portion of the multiple steps correspond to the sidewalls of the first electrode. The present application makes it less likely to damage the first electrode during the formation of the display panel, thereby improving the display effect of the display panel.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and an electronic device. Background Art

[0002] Organic light-emitting diodes (OLEDs) and flat-panel displays based on technologies such as light-emitting diodes (LEDs) have become a mainstream display panel technology, widely used in a variety of consumer electronics products, including mobile phones, televisions, laptops, and desktop computers, due to their advantages of high image quality, power efficiency, thin design, and wide application range. Traditionally, the production of display panels involves patterning the luminous pixels using a fine metal mask (FMM). While FMM technology is mature and boasts extensive mass production experience, it also suffers from limited precision, high development costs, and long development cycles. FMM-free technology eliminates the limitations of traditional OLED processes on display size, resolution, and other performance characteristics, offering the advantages of high performance, full-scale scalability, and agile delivery. Patents CN118251982A, CN115666161A, CN116648095A, CN117062489A, CN118678742A, CN118785761A, CN115224220A, CN118678729A, CN118660529A, and CN118660589A describe the non-fine metal mask technology for reference.

[0003] However, there are still some problems with display panels that need to be solved urgently. Summary of the Invention

[0004] In order to overcome the technical problems mentioned in the above technical background, an embodiment of the present application provides a display panel, wherein the display panel includes:

[0005] substrate;

[0006] a pixel defining layer, located on one side of the substrate, wherein the pixel defining layer defines a plurality of pixel openings;

[0007] an isolation structure, located on a side of the pixel defining layer away from the substrate, the isolation structure enclosing a plurality of isolation openings, the isolation openings being in communication with the corresponding pixel openings;

[0008] a plurality of light-emitting units, at least part of each of the light-emitting units being disposed on a side of the substrate facing away from the pixel defining layer, the light-emitting units comprising a first electrode, the pixel opening exposing a portion of the first electrode;

[0009] Wherein, along a direction away from the substrate, a side of the pixel defining layer away from the substrate has a plurality of steps connected in sequence, and at least part of the plurality of steps corresponds to a side wall of the first electrode.

[0010] In some possible implementations, the display panel further includes:

[0011] a raising layer, at least partially located between the substrate and the pixel defining layer, the raising layer comprising a plurality of raised portions spaced apart from each other, the orthographic projections of sidewalls of the raised portions away from the first electrode on the substrate being outside the orthographic projection of the first electrode on the substrate, and the plurality of steps corresponding to the sidewalls of the first electrode and the sidewalls of the raised portions away from the first electrode;

[0012] Preferably, the orthographic projection of the side wall of the elevated portion close to the first electrode on the substrate is located within the orthographic projection of the first electrode on the substrate.

[0013] In some possible embodiments, in a cross-section along the thickness direction of the display panel and passing through the centroid of the pixel opening, a distance between an orthographic projection of a side wall of the raised portion away from the first electrode on the substrate and an edge of the orthographic projection of the first electrode on the substrate is greater than or equal to 0.5 μm and less than or equal to 1.5 μm;

[0014] Preferably, the first electrode includes a first plane and a second plane, the first plane is a side of the first electrode facing the substrate, the second plane is a side of the first electrode away from the substrate, and the sidewall connects the first plane and the second plane;

[0015] Preferably, the isolation structure covers the plurality of steps.

[0016] In some possible implementations, the display panel further includes:

[0017] a conductive layer located on one side of the substrate, the conductive layer comprising a plurality of conductive traces arranged at intervals;

[0018] an insulating layer, located on a side of the conductive layer away from the substrate, and provided with a first via hole penetrating the insulating layer along a thickness direction of the substrate, wherein the first via hole exposes a portion corresponding to the conductive trace;

[0019] a transfer layer, the transfer layer comprising a plurality of transfer portions spaced apart from each other, at least a portion of the transfer portion being located in the first via hole and electrically connected to the conductive trace, and at least a portion of the transfer portion extending to a side of the insulating layer facing away from the substrate;

[0020] a filling layer, the filling layer comprising a plurality of filling portions arranged at intervals, the filling portions being located on a side of the transition portion away from the substrate and filling the first via hole, the first electrode being located on a side of the transition portion and the filling portion away from the substrate, the first electrode being electrically connected to the transition portion;

[0021] Preferably, there is a gap between the orthographic projection of the elevated portion on the substrate and the orthographic projection of the transition portion on the substrate, or the orthographic projection of the substrate and the edge of the orthographic projection of the transition portion on the substrate of the side of the elevated portion facing the transition portion overlap; or the side wall of the elevated portion close to the first electrode is within the range of the orthographic projection of the substrate and the orthographic projection of the transition portion on the substrate;

[0022] Preferably, the raised portion and the adapter portion are connected;

[0023] Preferably, the raised portion and the adapter portion are integrally formed;

[0024] Preferably, along a direction away from the substrate, a height of any one of the plurality of steps is less than a sum of thicknesses of the first electrode and the transition portion;

[0025] Preferably, the plurality of steps include a first step, and along a direction away from the substrate, a height of the first step is equal to a thickness of the raised portion;

[0026] Preferably, the plurality of steps include a second step, the second step is connected to the first step, the second step is located on a side of the first step away from the substrate, and a height of the second step in a direction away from the substrate is equal to a thickness of the first electrode;

[0027] Preferably, the orthographic projection of the first via hole on the substrate is located within the orthographic projection of the isolation opening on the substrate;

[0028] Preferably, the orthographic projection of the first via hole on the substrate is located within the orthographic projection of the pixel opening on the substrate;

[0029] Preferably, in a cross section along the thickness direction of the display panel and passing through the centroid of the pixel opening, a distance between edges of orthographic projections of two adjacent first electrodes on the substrate is greater than or equal to 1.2 μm and less than or equal to 1.4 μm.

[0030] In some possible implementations, along a direction away from the substrate, a thickness of the raised portion is equal to a thickness of the transition portion;

[0031] Preferably, the raised portion and the transition portion are made of the same layer and material;

[0032] Preferably, the raised portion and the adapter portion are connected to each other;

[0033] Preferably, along a direction away from the substrate, the thickness of the raised portion is greater than or equal to 100Å and less than or equal to 400Å.

[0034] In some possible implementations, the first electrode includes a first sub-electrode portion, a second sub-electrode portion, and a third sub-electrode portion stacked in sequence in a direction away from the substrate, and the first sub-electrode portion contacts the transition portion and the raised portion on a side facing the substrate;

[0035] Preferably, the material of the first sub-electrode portion is the same as that of the transition portion and the raised portion;

[0036] Preferably, the material of the raised portion includes indium tin oxide.

[0037] In some possible implementations, the transition portion includes a first transition sub-portion and a second transition sub-portion connected to each other, the first transition sub-portion being located on a side of the insulating layer away from the substrate, and the second transition sub-portion extending along the insulating layer toward a sidewall of the first via hole into the first via hole to form a recessed structure and contact the conductive trace;

[0038] Preferably, the distance between the side of the filling portion away from the substrate and the substrate is equal to the distance between the side of the first adapter portion away from the substrate and the substrate;

[0039] Preferably, a side of the filling portion away from the substrate is parallel to a plane of the substrate.

[0040] In some possible implementations, the orthographic projection of the first transfer sub-part on the substrate surrounds the orthographic projection of the second transfer sub-part on the substrate;

[0041] Preferably, the material of the filling layer is the same as that of the insulating layer;

[0042] Preferably, the material of the filling layer includes organic material.

[0043] In some possible implementations, the display panel further includes:

[0044] a plurality of packaging units, each of the packaging units being located on a side of the corresponding light-emitting unit away from the substrate, and each of the packaging units extending from a side of the isolation structure toward the isolation opening to a side of the isolation structure away from the substrate;

[0045] Preferably, the display panel further comprises a second encapsulation layer located on a side of the encapsulation unit away from the substrate, and a third encapsulation layer located on a side of the second encapsulation layer away from the substrate;

[0046] Preferably, the plurality of packaging units corresponding to the plurality of light-emitting units are arranged at intervals;

[0047] Preferably, a gap exists between the packaging unit located on a side of the isolation structure away from the substrate and a side of the isolation structure away from the substrate;

[0048] Preferably, the materials of the encapsulation unit and the third encapsulation layer both include inorganic materials;

[0049] Preferably, the material of the second encapsulation layer includes organic material.

[0050] In some possible implementations, the isolation structure includes a first isolation portion and a second isolation portion stacked sequentially in a direction away from the substrate, wherein an orthographic projection of a side of the first isolation portion away from the substrate on the substrate is located within an orthographic projection of the second isolation portion on the substrate;

[0051] Preferably, the light-emitting unit further comprises a light-emitting functional portion and a second electrode sequentially stacked in a direction away from the substrate, the light-emitting functional portion is located on a side of the first electrode away from the substrate, and the second electrode is electrically connected to the second isolation portion;

[0052] Preferably, the isolation structure further comprises a third isolation portion located on a side of the first isolation portion facing the substrate, and the second electrode of the light-emitting unit is electrically connected to the third isolation portion;

[0053] Preferably, the material of the third isolation portion includes molybdenum or titanium; and / or the material of the first isolation portion includes aluminum, silver or copper; and / or the material of the second isolation portion includes titanium or molybdenum.

[0054] In some possible implementations, the present application further provides a display panel, comprising:

[0055] substrate;

[0056] a raising layer, located on one side of the substrate, the raising layer comprising a plurality of raising portions arranged at intervals;

[0057] a pixel defining layer, located on a side of the padding layer away from the substrate, the pixel defining layer defining a plurality of pixel openings;

[0058] an isolation structure, located on a side of the pixel defining layer away from the substrate, the isolation structure enclosing a plurality of isolation openings, the isolation openings being in communication with the corresponding pixel openings;

[0059] a plurality of light-emitting units, at least part of each of the light-emitting units being disposed on a side of the substrate facing the pixel defining layer, each of the light-emitting units comprising a first electrode, and the pixel opening exposing a portion of the first electrode;

[0060] In which, the orthographic projection of the side wall of the elevated portion away from the first electrode on the substrate is outside the orthographic projection of the first electrode on the substrate, or the orthographic projection of the side wall of the elevated portion away from the first electrode on the substrate coincides with the edge of the orthographic projection of the first electrode on the substrate, and the orthographic projection of the side wall of the elevated portion close to the first electrode on the substrate is within the orthographic projection of the first electrode on the substrate.

[0061] In some possible implementations, the display panel further includes:

[0062] a conductive layer, located between the substrate and the padding layer, the conductive layer comprising a plurality of conductive traces arranged at intervals;

[0063] an insulating layer, located between the conductive layer and the padding layer, wherein a first via hole penetrating the insulating layer is provided on the insulating layer along a thickness direction of the substrate, and wherein the first via hole exposes a portion corresponding to the conductive trace;

[0064] a transfer layer, the transfer layer comprising a plurality of transfer portions spaced apart from each other, at least a portion of the transfer portion being located in the first via hole and electrically connected to the conductive trace, and at least a portion of the transfer portion extending to a side of the insulating layer facing away from the substrate;

[0065] a filling layer, the filling layer comprising a plurality of filling portions arranged at intervals, the filling portions being located on a side of the transition portion away from the substrate and filling the first via hole, the first electrode being located on a side of the transition portion and the filling portion away from the substrate, the first electrode being electrically connected to the transition portion;

[0066] Preferably, the raised portion is connected to the adapter portion;

[0067] Preferably, a distance between an orthographic projection of a side wall of the raised portion away from the first electrode on the substrate and an edge of the orthographic projection of the first electrode on the substrate is greater than or equal to 0.5 μm and less than or equal to 1.5 μm;

[0068] Preferably, a distance between edges of orthographic projections of two adjacent first electrodes on the substrate is greater than or equal to 1.2 μm and less than or equal to 1.4 μm;

[0069] Preferably, along a direction away from the substrate, the thickness of the raised portion is greater than or equal to 100Å and less than or equal to 400Å.

[0070] In some possible implementations, the present application further provides a method for preparing a display panel, the method comprising:

[0071] providing a substrate;

[0072] forming a first electrode on one side of the substrate;

[0073] A pixel defining layer and an isolation structure are formed on a side of the first electrode away from the substrate, wherein the pixel defining layer defines a plurality of pixel openings, and the isolation structure encloses a plurality of isolation openings, wherein the isolation openings are connected to the corresponding pixel openings;

[0074] A light-emitting unit is formed, wherein at least a portion of the light-emitting unit is disposed on a side of the substrate facing the pixel defining layer, the light-emitting unit includes the first electrode, the pixel opening exposes a portion of the first electrode, and along a direction away from the substrate, the side of the pixel defining layer away from the substrate has a plurality of steps connected in sequence, and at least a portion of the plurality of steps corresponds to the side wall of the first electrode.

[0075] In some possible implementations, before the step of forming the first electrode on one side of the substrate, the method further includes:

[0076] A raising layer is formed on one side of the substrate, the raising layer including a plurality of raised portions arranged at intervals, the orthographic projection of the side wall of the raising portion away from the first electrode on the substrate is located outside the orthographic projection of the first electrode on the substrate, or the orthographic projection of the side wall of the raising portion away from the first electrode on the substrate coincides with the edge of the orthographic projection of the first electrode on the substrate, the orthographic projection of the side wall of the raising portion close to the first electrode on the substrate is located within the orthographic projection of the first electrode on the substrate, and the plurality of steps correspond to the side wall of the first electrode and the raising portion.

[0077] In some possible implementations, the present application further provides an electronic device, which includes the display panel described in the present application, or includes a display panel prepared by the method for preparing the display panel described in the present application.

[0078] Compared with the prior art, this application has the following beneficial effects:

[0079] The present application provides a display panel and electronic device. By setting the pixel defining layer to include multiple steps at the side wall of the first electrode, the step difference of the pixel defining layer at the side wall of the first electrode can be reduced, and the pixel defining layer can be made flatter at the first electrode, so that the pixel defining layer is less likely to crack at the side wall of the first electrode, and the first electrode is not easily damaged during the process of forming the display panel, thereby improving the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0081] Figure 1 A schematic cross-sectional view of a display panel provided in an embodiment of the present application;

[0082] Figure 2 A schematic diagram of a partial top view of a display panel provided in an embodiment of the present application;

[0083] Figure 3a Provided in the embodiments of this application Figure 2 One of the cross-sectional diagrams at AA in the middle;

[0084] Figure 3b Provided in the embodiments of this application Figure 2 The second cross-sectional diagram at AA in the middle;

[0085] Figure 4 Provided in the embodiments of this application Figure 2 The third cross-sectional diagram at AA in the middle;

[0086] Figure 5 Provided in the embodiments of this application Figure 2 The fourth cross-sectional diagram at AA in the middle;

[0087] Figure 6 Provided in the embodiments of this application Figure 2 The fifth cross-sectional diagram at AA in the middle;

[0088] Figure 7 The display panel provided in the embodiment of the present application includes a cross-sectional schematic diagram of a first encapsulation layer;

[0089] Figure 8 A cross-sectional schematic diagram of a display panel provided in an embodiment of the present application including a second encapsulation layer and a third encapsulation layer;

[0090] Figure 9A schematic flow chart of a method for manufacturing a display panel provided in an embodiment of the present application;

[0091] Figure 10 A schematic cross-sectional view of forming a conductive layer and an insulating layer on one side of a substrate according to an embodiment of the present application;

[0092] Figure 11 A cross-sectional schematic diagram of forming a padding layer and a transfer layer on a side of an insulating layer away from a substrate according to an embodiment of the present application;

[0093] Figure 12 A cross-sectional schematic diagram of forming a filling layer on a side of a transition portion away from a substrate according to an embodiment of the present application;

[0094] Figure 13 A cross-sectional view of forming a first electrode on a side of the filling portion, the transition portion, and the raised portion away from the substrate provided in an embodiment of the present application;

[0095] Figure 14 This is a schematic cross-sectional view of a pixel defining layer formed on a side of the first electrode away from the substrate and an isolation structure located on a side of the pixel defining layer away from the substrate provided in an embodiment of the present application.

[0096] Figure markings: 1. substrate; 2. pixel defining layer; 21. pixel opening; 3. isolation structure; 31. first isolation portion; 32. second isolation portion; 33. third isolation portion; 4. first electrode; 41. first sub-electrode portion; 42. second sub-electrode portion; 43. third sub-electrode portion; 5. light-emitting function portion; 6. second electrode; 7. light-emitting unit; 8. step; 81. first step; 82. second step; 9. isolation opening; 10. raised portion; 11. insulating layer; 111. first via hole; 12. conductive trace; 13. filling portion; 14. transfer portion; 141. first transfer sub-portion; 142. second transfer sub-portion; 15. packaging unit; 16. second packaging layer; 17. third packaging layer. DETAILED DESCRIPTION

[0097] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0098] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0099] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0100] In the description of this application, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0101] It should be noted that, in the absence of conflict, different features in the embodiments of the present application can be combined with each other.

[0102] Increasing the density of light-emitting units (i.e., pixel density) in display panels is an important approach to improving display quality. However, current display panels manufactured using fine metal evaporation mask (FMM) technology are currently unable to achieve further increases in light-emitting unit density due to technical limitations. The inventors have discovered, through extensive research, that to address this technical issue, isolation structures can be incorporated into some display panels. During the full-layer evaporation of the light-emitting layer and the second electrode, these can be disconnected at the isolation structures. Through multiple evaporation and etching processes (i.e., light-emitting unit patterning), light-emitting units of different colors can be formed in different isolation openings.

[0103] A display panel in the related art includes a substrate, a pixel definition layer and an isolation structure stacked sequentially on one side of the substrate, and a light-emitting unit located within an isolation opening enclosed by the isolation structure. The light-emitting unit includes a first electrode located between the substrate and the pixel definition layer. Because the first electrode has a certain thickness in a direction away from the substrate, the pixel definition layer has a large step difference at the sidewalls of the first electrode, which makes it prone to cracks in the pixel definition layer. During the subsequent production of the display panel, etching solution can easily intrude into the first electrode through the cracks in the pixel definition layer, damaging the first electrode and thus affecting the luminous effect of the corresponding light-emitting unit. Furthermore, water vapor can easily intrude into the isolation structure through the cracks in the pixel definition layer, causing pitting in part of the isolation structure's film layer.

[0104] In order to solve the above-mentioned technical problems, the inventors have innovatively designed the following technical solutions, and the specific implementation solutions of this application will be described in detail below with reference to the accompanying drawings. It should be noted that the defects existing in the solutions in the above-mentioned prior art are the results obtained by the inventors after practice and careful research. Therefore, the discovery process of the above-mentioned technical problems and the solutions proposed in this embodiment below for the above-mentioned problems should all be the contributions made by the inventors to this application in the process of invention and creation, and should not be understood as technical contents known to those skilled in the art.

[0105] See Figure 1 This embodiment provides a display panel, which includes a substrate 1, a pixel defining layer 2, an isolation structure 3 and a plurality of light-emitting units 7.

[0106] The pixel defining layer 2 is located on one side of the substrate 1 , and the pixel defining layer 2 defines a plurality of pixel openings 21 .

[0107] The isolation structure 3 is located on a side of the pixel defining layer 2 away from the substrate 1 . The isolation structure 3 encloses a plurality of isolation openings 9 , which are connected to corresponding pixel openings 21 .

[0108] At least part of the light emitting unit 7 is disposed on the side of the substrate 1 facing the pixel defining layer 2 . The light emitting unit 7 includes a first electrode 4 , and the pixel opening 21 exposes a portion of the first electrode 4 . That is, at least part of the light emitting unit 7 is located within the pixel opening 21 .

[0109] In which, along the direction Z away from the substrate 1 , the side of the pixel defining layer 2 away from the substrate 1 has a plurality of steps 8 connected in sequence, and at least part of the plurality of steps 8 corresponds to the side wall of the first electrode 4 .

[0110] In the related art, cracks are generated in the pixel defining layer 2 at the sidewalls of the first electrode 4 .

[0111] In this embodiment, the pixel defining layer 2 is configured to include a plurality of steps 8 at the side wall of the first electrode 4. Normally, the sum of the heights of at least some of the steps 8 among the plurality of steps 8 is equal to the height of the discontinuity at the side wall of the first electrode 4, that is, the height of at least some of the steps 8 among the plurality of steps 8 is less than the height of the discontinuity at the side wall of the first electrode 4. In this way, the height of a single step 8 among the plurality of steps 8 can be reduced, that is, the discontinuity of the pixel defining layer 2 at the side wall of the first electrode 4 can be reduced, making the pixel defining layer 2 smoother at the first electrode 4, thereby making it less likely for the pixel defining layer 2 to crack at the side wall of the first electrode 4, and less likely for water vapor to penetrate the isolation structure 3 through the pixel defining layer 2, and less likely for some film layers in the isolation structure 3 to produce pitting.

[0112] At the same time, since the pixel defining layer 2 has a better coverage effect on the first electrode 4, in the subsequent preparation process of the display panel, for example, in the process of patterning the isolation structure 3, the corresponding etching solution is not easy to invade the first electrode 4 through the pixel defining layer 2, and is not easy to damage the first electrode 4, so that it is not easy to cause the corresponding light-emitting unit 7 to produce dark spots, thereby improving the display effect of the display panel.

[0113] Based on the above design, this embodiment reduces the step difference of the pixel defining layer 2 at the side wall of the first electrode 4 by setting the pixel defining layer 2 to include multiple steps 8 at the side wall of the first electrode 4, making the pixel defining layer 2 smoother at the first electrode 4, thereby making it less likely for the pixel defining layer 2 to crack at the side wall of the first electrode 4, and making it less likely for the first electrode 4 to be damaged during the formation of the display panel, thereby improving the display effect of the display panel.

[0114] For some possible implementations, see again Figure 1 The light emitting unit 7 further includes a light emitting functional portion 5 and a second electrode 6 stacked in sequence along a direction Z away from the substrate 1 . The light emitting functional portion 5 is located on a side of the first electrode 4 away from the substrate 1 .

[0115] The provision of the isolation structure 3 enables the display panel to form film layers of light-emitting units of different colors in different isolation openings 9 without the need for a fine mask. Specifically, when forming the light-emitting material layer, the light-emitting material layer is separated by the isolation structure 3 to form a plurality of spaced light-emitting functional units 5. When forming the second electrode material layer, the second electrode material layer is separated by the isolation structure 3 to form a plurality of spaced second electrodes 6. The isolation structure 3 includes a conductive material, and the second electrodes 6 are electrically connected to the isolation structure 3. A first electrode 4, a light-emitting functional unit 5, and a second electrode 6 form a light-emitting unit 7. The first electrode 4 can be an anode, and the second electrode 6 can be a cathode.

[0116] In this way, different light-emitting units 7 can be made independent of each other, thereby reducing crosstalk between adjacent light-emitting units 7 and improving the display effect of the display panel. At the same time, due to the presence of the isolation structure 3, the light-emitting material layer and the second electrode material layer in the light-emitting unit 7 of each color in the display panel can be first prepared on the entire surface and then patterned, thereby eliminating the need for a fine mask and further reducing the production cost of the display panel.

[0117] For some possible implementations, see Figure 2-3b The display panel also includes a raising layer, at least part of which is located between the substrate 1 and the pixel defining layer 2, and the raising layer includes a plurality of raised portions 10 arranged at intervals, and the orthographic projection of the side of the raised portion 10 away from the first electrode 4 on the substrate 1 is located outside the orthographic projection of the first electrode 4 on the substrate 1, and the plurality of steps 8 correspond to the side wall of the first electrode 4 and the side of the raised portion 10 away from the first electrode 4, wherein “the side of the raised portion 10 away from the first electrode 4” refers to the side wall of the raised portion 10 away from the first electrode 4.

[0118] Optionally, the orthographic projection of the side of the raised portion 10 close to the first electrode 4 on the substrate 1 is located within the orthographic projection of the first electrode 4 on the substrate 1 , and “the side of the raised portion 10 close to the first electrode 4 ” refers to the side wall of the raised portion 10 close to the first electrode 4 .

[0119] Optionally, the first electrode 4 includes a first plane and a second plane, the first plane is the side of the first electrode 4 facing the substrate 1, the second plane is the side of the first electrode 4 away from the substrate 1, and the sidewall connects the first plane and the second plane.

[0120] Corresponding steps 8 are formed on the pixel defining layer 2 at positions corresponding to the raised portions 10 . Therefore, the steps 8 correspond to the sidewalls of the first electrode 4 and the side of the raised portion 10 away from the first electrode 4 .

[0121] In this embodiment, a raised portion 10 is provided below the side wall of the first electrode 4, so that the pixel defining layer 2 at the side wall of the first electrode 4 can be raised, thereby reducing the step difference of the pixel defining layer 2 at the side wall of the first electrode 4, making the pixel defining layer 2 flatter at the first electrode 4, thereby making it less likely for cracks to form in the pixel defining layer 2 at the side wall of the first electrode 4.

[0122] For some possible implementations, see again Figure 2 and Figure 3a The display panel further includes a conductive layer, an insulating layer 11, a transfer layer and a filling layer.

[0123] The conductive layer is located on one side of the substrate 1 , and includes a plurality of conductive traces 12 arranged at intervals.

[0124] The insulating layer 11 is located on a side of the conductive layer away from the substrate 1 . A first via hole 111 is provided through the insulating layer 11 along the thickness direction Z of the substrate 1 . The first via hole 111 exposes a portion corresponding to the conductive trace 12 .

[0125] The transition layer includes a plurality of transition portions 14 spaced apart from each other. At least a portion of the transition portion 14 is located in the first via hole 111 and electrically connected to the conductive trace 12 . At least a portion of the transition portion 14 also extends to a side of the insulating layer 11 facing away from the substrate 1 .

[0126] The filling layer includes a plurality of filling portions 13 arranged at intervals. The filling portion 13 is located on the side of the transition portion 14 away from the substrate 1 and fills the first via 111 . The first electrode 4 is located on the side of the transition portion 14 and the filling portion 13 away from the substrate 1 . The first electrode 4 is electrically connected to the transition portion 14 .

[0127] The display panel further includes a pixel circuit (not shown) located between the substrate 1 and the conductive trace 12 . The conductive trace 12 is electrically connected to both the pixel circuit and the first electrode 4 . Thus, the signal of the pixel circuit can be transmitted to the first electrode 4 through the conductive trace 12 .

[0128] The transition portion 14 is electrically connected to both the conductive trace 12 and the first electrode 4. Therefore, the signal of the conductive trace 12 can be transmitted to the first electrode 4 through the transition portion 14. The first electrode 4 is usually recessed toward the substrate 1 at the first via hole 111. In this embodiment, the recessed portion of the first electrode 4 at the first via hole 111 is filled by the filling portion 13, which can make the first electrode 4 flatter at the first via hole 111, thereby further improving the display effect of the display panel.

[0129] Optionally, the orthographic projection of the first via hole 111 on the substrate 1 is located within the orthographic projection of the isolation opening 9 on the substrate 1 .

[0130] Optionally, the orthographic projection of the first via hole 111 on the substrate 1 is located within the orthographic projection of the pixel opening 21 on the substrate 1 .

[0131] In the related art, if the first via 111 is set on the side of the isolation structure 3 close to the substrate 1, it is not easy to reduce the spacing between adjacent light-emitting units 7, which is not conducive to forming a display panel with a high pixel density; if the orthographic projection of the first via 111 on the substrate 1 is set to be located within the orthographic projection of the pixel opening 21 on the substrate 1, the first electrode 4 will be recessed toward the direction of the substrate 1 at the first via 111, and eventually the film layers such as the light-emitting functional part 5 and the second electrode 6 will also be recessed toward the direction of the substrate 1, thereby affecting the display effect and reliability of the display panel.

[0132] In this embodiment, the transition portion 14 is electrically connected to the conductive trace 12 and the first electrode 4, and the filling portion 13 fills the recessed portion of the first electrode 4 at the first via hole 111, and the first via hole 111 is set to be located on the side of the pixel opening 21 close to the substrate 1. In this way, not only can the film layers such as the first electrode 4, the light-emitting functional portion 5 and the second electrode 6 be made flatter at the first via hole 111, but it is also more conducive to reducing the spacing between adjacent light-emitting units 7, thereby forming a display panel with a higher pixel density.

[0133] In the first embodiment, see again Figure 3a There is a gap between the orthographic projection of the elevated portion 10 on the substrate 1 and the orthographic projection of the transition portion 14 on the substrate 1 , and the orthographic projection of the side of the elevated portion 10 away from the first electrode 4 on the substrate 1 is outside the orthographic projection of the first electrode 4 on the substrate 1 .

[0134] In the second embodiment, see again Figure 3b There is a gap between the orthographic projection of the elevated portion 10 on the substrate 1 and the orthographic projection of the transition portion 14 on the substrate 1 , and the orthographic projection of the side of the elevated portion 10 away from the first electrode 4 on the substrate 1 coincides with the edge of the orthographic projection of the first electrode 4 on the substrate 1 .

[0135] In the third embodiment, please refer again to Figure 4 The orthographic projection of the side of the raised portion 10 facing the transition portion 14 on the substrate 1 coincides with the edge of the orthographic projection of the transition portion 14 on the substrate 1 , and the orthographic projection of the side of the raised portion 10 away from the first electrode 4 on the substrate 1 coincides with the edge of the orthographic projection of the first electrode 4 on the substrate 1 .

[0136] In the fourth embodiment, see Figure 5 The orthographic projection of the side of the raised portion 10 facing the transition portion 14 on the substrate 1 coincides with the edge of the orthographic projection of the transition portion 14 on the substrate 1 , and the orthographic projection of the side of the raised portion 10 away from the first electrode 4 on the substrate 1 is outside the orthographic projection of the first electrode 4 on the substrate 1 .

[0137] In the above four embodiments, along the direction Z away from the substrate 1 , the height of any one of the multiple steps 8 is less than the sum of the thicknesses of the first electrode 4 and the transition portion 14 .

[0138] Optionally, the plurality of steps 8 include a first step 81 , and along the direction Z away from the substrate 1 , a height H1 of the first step 81 is equal to a thickness H2 of the elevated portion 10 .

[0139] Optionally, the multiple steps 8 include a second step 82, which is connected to the first step 81 and is located on the side of the first step 81 away from the substrate 1. Along the direction Z away from the substrate 1, the height H3 of the second step 82 is equal to the thickness H5 of the first electrode 4.

[0140] In the related art, the pixel defining layer 2 forms only one step 8 at the side wall of the first electrode 4 , and the height of the step 8 is equal to the sum of the thicknesses of the first electrode 4 and the transition portion 14 .

[0141] In another embodiment, the raised portion 10 may also extend to the side of the transition portion 14 close to the substrate 1 , that is, the orthographic projection of the side wall of the raised portion 10 close to the first electrode 4 on the substrate 1 is located within the orthographic projection range of the transition portion 14 on the substrate 1 .

[0142] In this embodiment, the pixel defining layer 2 forms a first step 81 at the elevated portion 10. The first step 81 corresponds to the elevated portion 10. Therefore, the height H1 of the first step 81 is equal to the thickness H2 of the elevated portion 10. Because the orthographic projection of the side of the elevated portion 10 closest to the first electrode 4 on the substrate 1 is within the orthographic projection of the first electrode 4 on the substrate 1, the elevated portion 10 does not cover the sidewalls of the first electrode 4. The pixel defining layer 2 forms a second step 82 at the sidewalls of the first electrode 4. The second step 82 corresponds to the sidewalls of the first electrode 4. Therefore, the height H3 of the second step 82 is equal to the thickness H5 of the first electrode 4.

[0143] In this way, the step 8, whose original height is equal to the sum of the thicknesses of the first electrode 4 and the transition portion 14, is set to include a first step 81 and a second step 82, and the height of any one of the first step 81 and the second step 82 is less than the sum of the thicknesses of the first electrode 4 and the transition portion 14, thereby reducing the step difference of the pixel defining layer 2 at the side wall of the first electrode 4, making the pixel defining layer 2 smoother at the first electrode 4, and making it less likely for the pixel defining layer 2 to generate cracks at the side wall of the first electrode 4.

[0144] Preferably, the isolation structure 3 covers a plurality of steps 8 .

[0145] Since the height of each step 8 in the multiple steps 8 is smaller than the height of the step formed by the pixel defining layer 2 at the side wall of the first electrode 4 in the related art, when the isolation structure 3 covers the multiple steps 8, the isolation structure 3 can be made more stable, and the isolation structure 3 can be made flatter at the multiple steps 8, thereby further improving the reliability of the display panel.

[0146] Preferably, see again Figure 3a In a cross-section along the thickness direction of the display panel and passing through the centroid of the pixel opening 21, a distance D1 between the orthographic projection of the side of the raised portion 10 away from the first electrode 4 on the substrate 1 and the edge of the orthographic projection of the first electrode 4 on the substrate 1 is greater than or equal to 0.5 μm and less than or equal to 1.5 μm.

[0147] For example, the distance D1 can be 0.5μm, 0.7μm, 1μm, 1.2μm, 1.4μm or 1.5μm, etc. Reasonable setting of the distance D1 can not only reduce the step difference of the pixel defining layer 2 at the side wall of the first electrode 4, but also reduce the spacing between adjacent light-emitting units 7, thereby being more conducive to improving the pixel density of the display panel.

[0148] Optionally, see again Figure 3a In a cross section along the thickness direction of the display panel and passing through the centroid of the pixel opening 21 , a distance D2 between edges of the orthographic projections of two adjacent first electrodes 4 on the substrate 1 is greater than or equal to 1.2 μm and less than or equal to 1.4 μm.

[0149] For example, the distance D2 may be 1.2 μm, 1.3 μm, or 1.4 μm. Reasonable setting of the distance D2 can reduce the spacing between adjacent light-emitting units 7 , thereby being more conducive to improving the pixel density of the display panel.

[0150] For some possible implementations, see again Figure 4 , along the direction Z away from the substrate 1 , the thickness of the raised portion 10 is equal to the thickness of the transition portion 14 .

[0151] Optionally, the raised portion 10 and the transition portion 14 are made of the same layer and the same material.

[0152] In this embodiment, the raised portion 10 is formed simultaneously with the formation of the transition portion 14 . Thus, no special process is required to form the raised portion 10 , thereby reducing the process cost of forming the raised portion 10 .

[0153] Optionally, see again Figure 5 The raising portion 10 and the connecting portion 14 are connected to each other.

[0154] In this embodiment, the raised portion 10 and the transition portion 14 can be regarded as a whole, and the orthographic projection of the first electrode 4 on the substrate 1 is located within the figure composed of the orthographic projections of the raised portion 10 and the transition portion 14 on the substrate 1, and the area of ​​the orthographic projection of the first electrode 4 on the substrate 1 is smaller than the area of ​​the figure composed of the orthographic projections of the raised portion 10 and the transition portion 14 on the substrate 1.

[0155] The raised portion 10 and the adapter portion 14 are integrally formed, and there is no gap between the raised portion 10 and the adapter portion 14. The signal of the first trace is transmitted to the first electrode 4 through the adapter portion 14 and the raised portion 10. This is not only more conducive to transmitting the signal of the first electrode 4, but also makes the first electrode 4 flatter.

[0156] Preferably, see again Figure 4Along the direction Z away from the substrate 1, the thickness H2 of the raised portion 10 is greater than or equal to 100 Å and less than or equal to 400 Å. For example, the thickness H2 can be 100 Å, 150 Å, 200 Å, 250 Å, 300 Å, 350 Å, or 400 Å. By properly setting the thickness H2, the height H1 of the first step 81 can be appropriately set without excessively increasing the thickness of the display panel.

[0157] For some possible implementations, see Figure 6 The first electrode 4 includes a first sub-electrode portion 41, a second sub-electrode portion 42 and a third sub-electrode portion 43 which are stacked in sequence along a direction Z away from the substrate 1. The first sub-electrode portion 41 contacts the transition portion 14, the raised portion 10 and the filling portion 13 on the side facing the substrate 1.

[0158] Optionally, the material of the first sub-electrode portion 41 is the same as that of the transition portion 14 and the padding portion 10 .

[0159] Optionally, the material of the raised portion 10 includes indium tin oxide.

[0160] Generally, the bonding effect of two film layers made of the same material is better than the bonding effect of two film layers made of different materials. In this embodiment, the material of the first sub-electrode portion 41 is set to be the same as the material of the transition portion 14 and the raised portion 10, and the side of the first sub-electrode portion 41 facing the substrate 1 is set to be in contact with the transition portion 14, the raised portion 10 and the filling portion 13. This can improve the adhesion between the first sub-electrode and the raised portion 10 and the filling portion 13, thereby improving the stability of the first electrode 4.

[0161] For some possible implementations, see again Figure 6 The transfer portion 14 includes a first transfer sub-portion 141 and a second transfer sub-portion 142 connected to each other. The first transfer sub-portion 141 is located on the side of the insulating layer 11 away from the substrate 1, and the second transfer sub-portion 142 extends along the insulating layer 11 toward the side wall of the first via 111 to form a recessed structure in the first via 111 and contacts the conductive trace 12.

[0162] Optionally, the distance between the side of the filling portion 13 away from the substrate 1 and the substrate 1 is equal to the distance between the side of the first adapter portion 141 away from the substrate 1 and the substrate 1 .

[0163] Optionally, a side of the filling portion 13 away from the substrate 1 is parallel to a plane of the substrate 1 .

[0164] Optionally, the orthographic projection of the first adapter sub-portion 141 on the substrate 1 surrounds the orthographic projection of the second adapter sub-portion 142 on the substrate 1 .

[0165] In this way, the filling portion 13 and the side of the first adapter portion 141 and the raised portion 10 away from the substrate 1 are located on the same plane parallel to the substrate 1, which can further improve the flatness of the first electrode 4, thereby further improving the display effect and performance of the display panel.

[0166] Preferably, the material of the filling layer is the same as that of the insulating layer 11 .

[0167] Optionally, the material of the filling layer includes organic material.

[0168] The filling layer and the insulating layer 11 are both made of organic materials. The insulating layer 11 may be a planarization layer. This makes it easier to form the filling layer and to make the side of the filling portion 13 away from the substrate 1 a flat surface.

[0169] For some possible implementations, see Figure 7 The display panel also includes a plurality of packaging units 15, which are located on the side of the corresponding light-emitting unit 7 away from the substrate 1, and part of the packaging unit 15 extends from the side of the isolation structure 3 toward the isolation opening 9 to the side of the isolation structure 3 away from the substrate 1.

[0170] Optionally, the multiple encapsulation units 15 corresponding to the multiple light-emitting units 7 are arranged at intervals.

[0171] Optionally, a gap exists between the encapsulation unit 15 located on the side of the isolation structure 3 away from the substrate 1 and the side of the isolation structure 3 away from the substrate 1 .

[0172] During the patterning process of the light-emitting unit 7 , the first packaging material layer is disconnected at the isolation structure 3 to form the packaging unit 15 . The packaging unit 15 can completely and independently package the corresponding light-emitting unit 7 , thereby improving the display characteristics of the display panel.

[0173] Preferably, see Figure 8 The display panel further includes a second encapsulation layer 16 located on a side of the encapsulation unit 15 away from the substrate 1 and a third encapsulation layer 17 located on a side of the second encapsulation layer 16 away from the substrate 1 .

[0174] Optionally, the materials of the encapsulation unit 15 and the third encapsulation layer 17 both include inorganic materials, and the material of the second encapsulation layer 16 includes organic materials.

[0175] For example, the encapsulation unit 15 and the third encapsulation layer 17 can be formed by chemical vapor deposition (CVD), and the second encapsulation layer 16 can be formed by inkjet printing (IJP). The second encapsulation layer 16 and the third encapsulation layer 17 can provide a better encapsulation effect on the light-emitting unit 7, thereby further improving the encapsulation quality of the display panel.

[0176] For some possible implementations, see again Figure 7 The isolation structure 3 includes a first isolation portion 31 and a second isolation portion 32 stacked in sequence along a direction Z away from the substrate 1, and the orthographic projection of the side of the first isolation portion 31 away from the substrate 1 on the substrate 1 is located within the orthographic projection of the second isolation portion 32 on the substrate 1.

[0177] Because the second isolating portion 32 is located on the side of the first isolating portion 31 away from the substrate 1 and the lateral width of the second isolating portion 32 is greater than the lateral width of the first isolating portion 31 in a plane parallel to the substrate 1, the second isolating portion 32 disconnects the light-emitting material layer and the second electrode material layer at the isolation structure 3. Thus, the isolation structure 3 formed by the first isolating portion 31 and the second isolating portion 32 makes it easier to independently package each light-emitting unit 7, thereby improving the packaging yield of the display panel.

[0178] Please see again Figure 7 , the second electrode 6 is electrically connected to the second isolation portion 32; the first isolation portion 31 includes a conductive material, and the second electrode 6 corresponding to the light-emitting unit 7 extends to contact the side wall of the first isolation portion 31 to achieve electrical connection between the second electrode 6 corresponding to the light-emitting unit 7 and the first isolation portion 31.

[0179] Please see again Figure 8 The isolation structure 3 further includes a third isolation portion 33 located on the side of the first isolation portion 31 facing the substrate 1 , and the second electrode 6 of the light emitting unit 7 is electrically connected to the third isolation portion 33 .

[0180] Optionally, the material of the third isolation portion 33 includes molybdenum or titanium; and / or the material of the first isolation portion 31 includes aluminum, silver or copper; and / or the material of the second isolation portion 32 includes titanium or molybdenum.

[0181] The third isolation portion 33 includes a conductive material. The second electrode 6 corresponding to the light emitting unit 7 extends to contact the sidewall of the third isolation portion 33 to achieve electrical connection between the second electrode 6 corresponding to the light emitting unit 7 and the third isolation portion 33 .

[0182] Optionally, the orthographic projection of the light emitting functional portion 5 on the substrate 1 is outside the orthographic projection of the third isolation portion 33 on the substrate 1. In this way, the light emitting functional portion 5 does not overlap with the isolation structure 3, thereby effectively improving the crosstalk problem between the light emitting units 7.

[0183] In the related art, water vapor easily intrudes into the first isolation portion 31 through cracks in the pixel definition layer 2 at the sidewall of the first electrode 4 , causing pitting in the first isolation portion 31 .

[0184] In the above manner, the present application can prevent cracks from easily forming on the sidewalls of the first electrode 4 in the pixel defining layer 2 , thereby effectively alleviating the problem of pitting on the first isolation portion 31 .

[0185] For some possible implementations, see again Figure 2-Figure 4 The present application also provides another display panel, which includes a substrate 1, a cushioning layer, a pixel defining layer 2, an isolation structure 3 and a plurality of light-emitting units 7.

[0186] The raising layer is located on one side of the substrate 1 , and includes a plurality of raising portions 10 arranged at intervals.

[0187] The pixel defining layer 2 is located on a side of the elevated layer away from the substrate 1 , and defines a plurality of pixel openings 21 .

[0188] The isolation structure 3 is located on a side of the pixel defining layer 2 away from the substrate 1 . The isolation structure 3 encloses a plurality of isolation openings 9 , which are connected to corresponding pixel openings 21 .

[0189] At least a portion of the light emitting unit 7 is located in the isolation opening 9 . The light emitting unit 7 includes a first electrode 4 . The pixel opening 21 exposes a portion of the first electrode 4 .

[0190] In which, the orthographic projection of the side of the raised portion 10 away from the first electrode 4 on the substrate 1 is located outside the orthographic projection of the first electrode 4 on the substrate 1, or the orthographic projection of the side of the raised portion 10 away from the first electrode 4 on the substrate 1 coincides with the edge of the orthographic projection of the first electrode 4 on the substrate 1, and the orthographic projection of the side of the raised portion 10 close to the first electrode 4 on the substrate 1 is located within the orthographic projection of the first electrode 4 on the substrate 1.

[0191] In the related art, cracks are easily generated on the sidewalls of the pixel defining layer 2 and the first electrode 4 .

[0192] In this embodiment, a raised portion 10 is provided below the side wall of the first electrode 4 to avoid the formation of a concave structure below the first electrode 4, thereby reducing the step difference of the pixel defining layer 2 at the side wall of the first electrode 4 and making the pixel defining layer 2 smoother at the first electrode 4. As a result, the pixel defining layer 2 is less likely to crack at the side wall of the first electrode 4, water vapor is less likely to penetrate the isolation structure 3 through the pixel defining layer 2, and it is less likely to cause pitting in some film layers in the isolation structure 3.

[0193] At the same time, since the pixel defining layer 2 has a better coverage effect on the first electrode 4, in the subsequent preparation process of the display panel, for example, in the process of patterning the isolation structure 3, the corresponding etching solution is not easy to invade the first electrode 4 through the pixel defining layer 2, and is not easy to damage the first electrode 4, so that it is not easy to cause the corresponding light-emitting unit 7 to produce dark spots, thereby improving the display effect of the display panel.

[0194] The remaining technical solutions of the display panel in this embodiment are the same as those of the display panel in the above embodiment and will not be described again here.

[0195] For some possible implementations, see Figure 1 and Figure 9 , the present application also provides a method for preparing a display panel, the method comprising:

[0196] S10: providing a substrate 1.

[0197] S11 : forming a first electrode 4 on one side of the substrate 1 .

[0198] S12: A pixel defining layer 2 and an isolation structure 3 located on the side of the pixel defining layer 2 away from the substrate 1 are formed on the side of the first electrode 4 away from the substrate 1, the pixel defining layer 2 defines a plurality of pixel openings 21, and the isolation structure 3 encloses a plurality of isolation openings 9, which are connected to the corresponding pixel openings 21.

[0199] S13: A light-emitting unit 7 is formed, and at least a portion of the light-emitting unit 7 is arranged on a side of the substrate 1 facing the pixel defining layer 2. The light-emitting unit 7 includes a first electrode 4, and a pixel opening 21 exposes a portion of the first electrode 4. Along a direction Z away from the substrate 1, a side of the pixel defining layer 2 away from the substrate 1 has a plurality of steps 8 connected in sequence, and at least a portion of the plurality of steps 8 corresponds to the side wall of the first electrode 4.

[0200] In the display panel formed by the above method, the pixel defining layer 2 forms multiple steps 8 at the side wall of the first electrode 4, which can reduce the height of a single step 8 in the multiple steps 8, that is, the step difference of the pixel defining layer 2 at the side wall of the first electrode 4 can be reduced, so that the pixel defining layer 2 is smoother at the first electrode 4, so that the pixel defining layer 2 is not prone to cracks at the side wall of the first electrode 4, water vapor is not easy to invade the isolation structure 3 through the pixel defining layer 2, and it is not easy to cause pitting in some film layers in the isolation structure 3.

[0201] At the same time, since the pixel defining layer 2 has a better coverage effect on the first electrode 4, in the subsequent preparation process of the display panel, for example, in the process of patterning the isolation structure 3, the corresponding etching solution is not easy to invade the first electrode 4 through the pixel defining layer 2, and is not easy to damage the first electrode 4, so that it is not easy to cause the corresponding light-emitting unit 7 to produce dark spots, thereby improving the display effect of the display panel.

[0202] In some possible implementations, before the step of forming the first electrode 4 on one side of the substrate 1, the method further includes:

[0203] See Figure 10 A conductive layer and an insulating layer 11 are formed on one side of the substrate 1 . The conductive layer includes a plurality of conductive traces 12 arranged at intervals. A first via 111 is provided on the insulating layer 11 . The first via 111 exposes a portion of the conductive trace 12 .

[0204] See Figure 11 A raising layer and a transfer layer are formed on the side of the insulating layer 11 away from the substrate 1. The raising layer and the transfer layer are arranged on the same layer. The raising layer includes a plurality of raising portions 10 arranged at intervals, and the transfer layer includes a plurality of transfer portions 14 arranged at intervals. The raising portions 10 and the transfer portions 14 can be electrically connected. At least a portion of the transfer portion 14 is located in the first via 111 and is electrically connected to the conductive trace 12. At least a portion of the transfer portion 14 also extends to the side of the insulating layer 11 away from the substrate 1.

[0205] A raising layer is formed on one side of the substrate 1, and the raising layer includes a plurality of raised portions 10 arranged at intervals. The orthographic projection of the side of the raising portion 10 away from the first electrode 4 on the substrate 1 is located outside the orthographic projection of the first electrode 4 on the substrate 1, or the orthographic projection of the side of the raising portion 10 away from the first electrode 4 on the substrate 1 coincides with the edge of the orthographic projection of the first electrode 4 on the substrate 1, and the orthographic projection of the side of the raising portion 10 close to the first electrode 4 on the substrate 1 is located within the orthographic projection of the first electrode 4 on the substrate 1, and the plurality of steps 8 correspond to the side wall of the first electrode 4 and the raising portion 10.

[0206] See Figure 12A filling layer is formed on the side of the transition portion 14 away from the substrate 1 , and the filling layer includes a plurality of filling portions 13 arranged at intervals. The filling portions 13 are located on the side of the transition portion 14 away from the substrate 1 and fill the first via hole 111 .

[0207] See Figure 13 A first electrode 4 is formed on the side of the filling portion 13 , the transition portion 14 and the raised portion 10 away from the substrate 1 , and the first electrode 4 is electrically connected to the transition portion 14 .

[0208] After the step of forming the first electrode 4 on one side of the substrate 1, the method further includes:

[0209] See Figure 14 A pixel defining layer 2 and an isolation structure 3 are formed on the side of the first electrode 4 away from the substrate 1. The pixel defining layer 2 defines a plurality of pixel openings 21. The isolation structure 3 encloses a plurality of isolation openings 9, which are connected to corresponding pixel openings 21. Corresponding steps 8 are formed on the pixel defining layer 2 at locations corresponding to the raised portions 10.

[0210] Please see again Figure 7 , forming a light emitting unit 7 and an encapsulation unit 15 located on a side of the light emitting unit 7 away from the substrate 1 , and at least a portion of the light emitting unit 7 is located in the isolation opening 9 .

[0211] In this embodiment, the above method can form a raised portion 10 at the side wall of the first electrode 4. The raised portion 10 can raise the pixel defining layer 2 at the side wall of the first electrode 4. The raised portion 10 can form multiple steps 8 in the pixel defining layer 2 at the side wall of the first electrode 4, which can reduce the step difference of the pixel defining layer 2 at the side wall of the first electrode 4, making the pixel defining layer 2 smoother at the first electrode 4, thereby making it less likely for the pixel defining layer 2 to form cracks at the side wall of the first electrode 4.

[0212] In some possible implementations, the present application further provides an electronic device, comprising the display panel of the present application, or comprising a display panel produced by the method for producing a display panel of the present application. The electronic device may include a device with image processing capabilities, such as a server, a personal computer, a laptop computer, a mobile phone, a tablet computer, a wearable device, an in-vehicle display device, etc. Because the electronic device includes the display panel of the present application, the display effect of the electronic device is improved.

[0213] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0214] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A display panel, characterized in that: The display panel includes: substrate; a pixel defining layer, located on one side of the substrate, wherein the pixel defining layer defines a plurality of pixel openings; an isolation structure, located on a side of the pixel defining layer away from the substrate, the isolation structure enclosing a plurality of isolation openings, the isolation openings being in communication with the corresponding pixel openings; a plurality of light-emitting units, at least part of each of the light-emitting units being disposed on a side of the substrate facing the pixel defining layer, each of the light-emitting units comprising a first electrode, and the pixel opening exposing a portion of the first electrode; Wherein, along a direction away from the substrate, a side of the pixel defining layer away from the substrate has a plurality of steps connected in sequence, and at least part of the plurality of steps corresponds to a side wall of the first electrode.

2. The display panel according to claim 1, wherein: The display panel further includes: A raising layer is at least partially located between the substrate and the pixel defining layer, and the raising layer includes a plurality of raised portions arranged at intervals, wherein the orthographic projection of the side wall of the raising portion away from the first electrode on the substrate is outside the orthographic projection of the first electrode on the substrate, and the orthographic projection of the side wall of the raising portion close to the first electrode on the substrate is within the orthographic projection of the first electrode on the substrate, and the plurality of steps correspond to the side wall of the first electrode and the side wall of the raising portion away from the first electrode.

3. The display panel according to claim 2, wherein: In a cross section along the thickness direction of the display panel and passing through the centroid of the pixel opening, a distance between an orthographic projection of a side wall of the raised portion away from the first electrode on the substrate and an edge of the orthographic projection of the first electrode on the substrate is greater than or equal to 0.5 μm and less than or equal to 1.5 μm; Alternatively, the isolation structure covers the multiple steps.

4. The display panel according to claim 2, wherein: The display panel further includes: a conductive layer located on one side of the substrate, the conductive layer comprising a plurality of conductive traces arranged at intervals; an insulating layer, located on a side of the conductive layer away from the substrate, and provided with a first via hole penetrating the insulating layer along a thickness direction of the substrate, wherein the first via hole exposes a portion corresponding to the conductive trace; a transfer layer, the transfer layer comprising a plurality of transfer portions spaced apart from each other, at least a portion of the transfer portion being located in the first via hole and electrically connected to the conductive trace, and at least a portion of the transfer portion extending to a side of the insulating layer facing away from the substrate; a filling layer, the filling layer comprising a plurality of filling portions arranged at intervals, the filling portions being located on a side of the transition portion away from the substrate and filling the first via hole, the first electrode being located on a side of the transition portion and the filling portion away from the substrate, the first electrode being electrically connected to the transition portion; There is a gap between the orthographic projection of the raised portion on the substrate and the orthographic projection of the transition portion on the substrate. Alternatively, the orthographic projection of the side of the raised portion facing the transition portion on the substrate coincides with the orthographic projection edge of the transition portion on the substrate. Alternatively, the orthographic projection of the side wall of the elevated portion close to the first electrode on the substrate is located within the orthographic projection range of the transition portion on the substrate.

5. The display panel according to claim 4, wherein: The raised portion and the adapter portion are integrally formed; Alternatively, along a direction away from the substrate, a height of any one of the plurality of steps is less than a sum of thicknesses of the first electrode and the transition portion; Alternatively, the plurality of steps include a first step, and a height of the first step is equal to a thickness of the raised portion in a direction away from the substrate; Alternatively, the plurality of steps include a first step, wherein a height of the first step in a direction away from the substrate is equal to a thickness of the raised portion, and the plurality of steps include a second step, wherein the second step is connected to the first step, the second step is located on a side of the first step away from the substrate, and wherein a height of the second step in a direction away from the substrate is equal to a thickness of the first electrode; Alternatively, the orthographic projection of the first via hole on the substrate is located within the orthographic projection of the isolation opening on the substrate; or, the orthographic projection of the first via hole on the substrate is located within the orthographic projection of the pixel opening on the substrate; Alternatively, in a cross section along the thickness direction of the display panel and passing through the centroid of the pixel opening, a distance between edges of orthographic projections of two adjacent first electrodes on the substrate is greater than or equal to 1.2 μm and less than or equal to 1.4 μm.

6. The display panel according to claim 4, wherein: Along a direction away from the substrate, the thickness of the raised portion is equal to the thickness of the transition portion; Alternatively, the raised portion and the transition portion are made of the same layer and material; Alternatively, along a direction away from the substrate, the thickness of the raised portion is greater than or equal to 100Å and less than or equal to 400Å.

7. The display panel according to claim 4, wherein: The first electrode includes a first sub-electrode portion, a second sub-electrode portion, and a third sub-electrode portion stacked in sequence in a direction away from the substrate. The first sub-electrode portion contacts the transition portion and the raised portion on a side facing the substrate.

8. The display panel according to claim 7, wherein: The material of the first sub-electrode portion is the same as that of the transition portion and the raised portion; Alternatively, the material of the raised portion includes indium tin oxide.

9. The display panel according to claim 4, wherein: The transition portion includes a first transition sub-portion and a second transition sub-portion connected to each other, the first transition sub-portion being located on a side of the insulating layer away from the substrate, and the second transition sub-portion extending along the insulating layer toward the sidewall of the first via hole into the first via hole to form a recessed structure and contact the conductive trace; Alternatively, the distance between the side of the filling portion away from the substrate and the substrate is equal to the distance between the side of the first adapter portion away from the substrate and the substrate; Alternatively, a side of the filling portion away from the substrate is parallel to a plane of the substrate.

10. The display panel according to claim 9, wherein: An orthographic projection of the first transfer sub-portion on the substrate surrounds an orthographic projection of the second transfer sub-portion on the substrate.

11. The display panel according to any one of claims 1 to 10, characterized in that: The isolation structure includes a first isolation portion and a second isolation portion stacked in sequence in a direction away from the substrate, wherein the orthographic projection of the first isolation portion away from the substrate on the substrate is located within the orthographic projection of the second isolation portion on the substrate.

12. An electronic device, characterized in that: The electronic device comprises the display panel according to any one of claims 1 to 11.

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