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 isolation structure is arranged on one side of the substrate, a plurality of isolation openings used for containing the light emitting units are defined by the isolation structure, the isolation structure comprises a first supporting part and a second supporting part, the second supporting part comprises a first surface and a second surface which are oppositely arranged, and the second surface is located between the substrate and the first surface; the second supporting part further comprises a first side face connected with the first surface and the second surface, and the first side face is provided with a concave-convex structure. The concave-convex structure is arranged on the side surface of the isolation structure, so that the binding force between the isolation structure and the packaging layer can be improved, and liquid medicine is prevented from entering between the side surface of the second supporting part and the packaging layer when wet etching is carried out on an area outside the current color light-emitting unit; therefore, the first supporting part is corroded and the light-emitting unit of the current color is eroded, pixel dark spots are caused, 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 packaging effect and display performance.

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

[0006] substrate;

[0007] An isolation structure, disposed on one side of the substrate, the isolation structure encloses a plurality of isolation openings for accommodating light-emitting units, the isolation structure comprises a first supporting portion and a second supporting portion, the second supporting portion being located on a side of the first supporting portion away from the substrate;

[0008] The second supporting portion includes a first surface and a second surface that are arranged opposite to each other, and the second surface is located between the substrate and the first surface; the second supporting portion also includes a first side surface connecting the first surface and the second surface, and the first side surface is provided with a concave-convex structure.

[0009] In one embodiment, the second supporting portion includes a first protective layer, a first metal layer, and a second protective layer which are stacked and sequentially arranged away from the substrate, the first side surface includes a second side surface located on the first metal layer, and the concavo-convex structure is arranged on the second side surface;

[0010] Preferably, the material of the first protective layer and the second protective layer includes titanium, and the material of the first metal layer includes aluminum.

[0011] In one embodiment, the concavo-convex structure includes burrs;

[0012] Preferably, the material of the second supporting portion includes metal, and the burrs are formed by oxidation of the metal when it is exposed to air.

[0013] In one embodiment, the light-emitting unit includes a first electrode, a light-emitting layer, and a second electrode sequentially stacked on the substrate, and the light-emitting layer and the second electrode are located in the isolation opening;

[0014] Preferably, the display panel also includes a pixel defining layer, which is located between the isolation structure and the substrate, and the pixel defining layer defines a plurality of pixel openings corresponding to the isolation openings respectively, and the pixel openings are connected to the corresponding isolation openings, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the corresponding isolation opening on the substrate, and the pixel defining layer covers the gaps between adjacent first electrodes and the edges of the first electrodes, so that the pixel openings expose the first electrodes.

[0015] In one embodiment, the first support portion includes a first sub-support portion and a second sub-support portion, the first sub-support portion is located between the second sub-support portion and the substrate, the orthographic projection of the second sub-support portion on the substrate is located within the orthographic projection of the first sub-support portion on the substrate, and the second electrode overlaps the first sub-support portion;

[0016] Preferably, a lap step is provided on the second sub-support portion, and an edge of the second electrode overlaps the lap step;

[0017] Preferably, the material of the second sub-support portion includes aluminum, and the material of the first sub-support portion includes molybdenum.

[0018] In one embodiment, the display panel further includes a first encapsulation layer, the first encapsulation layer covers the isolation structure and the light-emitting unit, and the first encapsulation layer is connected to the concave-convex structure.

[0019] In one embodiment, the isolation openings include a first type of openings, a second type of openings and a third type of openings, and the first type of openings, the second type of openings and the third type of openings respectively define the light-emitting units with different colors of emitted light.

[0020] Based on the same inventive concept, the present application also discloses a method for preparing a display panel, which comprises:

[0021] sequentially forming a stacked first support layer, a first protective layer and a first metal layer on one side of the substrate;

[0022] Patterning the first metal layer;

[0023] forming a second protective layer on the patterned first metal layer and on the first protective layer in an area not covered by the first metal layer;

[0024] Patterning the first protective layer and the second protective layer, removing the first protective layer and the second protective layer in the area on the first supporting layer not covered by the first protective layer, and retaining the second protective layer on the second side surface of the first metal layer; wherein the second side surface is a surface on the first metal layer connecting the first protective layer and the second protective layer;

[0025] The first supporting layer is patterned to form a first supporting portion; the orthographic projection of the first supporting portion on the substrate is located within the orthographic projection of the patterned first metal layer on the substrate;

[0026] The second protective layer is patterned, and the second protective layer on the second side is removed, so that the second side is exposed to the air to form burrs, so as to form an isolation structure, and the isolation structure encloses a plurality of isolation openings for accommodating light-emitting units.

[0027] In one embodiment, the method for preparing the display panel further includes:

[0028] forming a first encapsulation layer on the isolation structure and in the isolation opening, wherein the first encapsulation layer is connected to the second side surface;

[0029] Preferably, the second protective layer on the second side surface of the first metal layer is removed, and then the method further comprises:

[0030] Patterning the first protective layer so that a side surface of the first protective layer, a side surface of the second protective layer and the second side surface form a first side surface, and the first side surface is a plane;

[0031] Preferably, the patterning of the first protective layer and the second protective layer includes:

[0032] Patterning the first protective layer and the second protective layer by dry etching;

[0033] Preferably, the step of patterning the first supporting layer to form a first supporting portion includes:

[0034] The first supporting layer is patterned by dry etching to form a first supporting portion.

[0035] Based on the same inventive concept, the present application also discloses a display device, which includes the above-mentioned display panel.

[0036] Compared with the prior art, the isolation structure in the display panel provided by the present application includes a first supporting part and a second supporting part, and a concave-convex structure is arranged on the side of the second supporting part. The concave-convex structure can enhance the bonding force between the side of the second supporting part and the encapsulation layer, thereby preventing the liquid from entering from the side of the second supporting part and the encapsulation layer when wet etching is performed on the area outside the current color light-emitting unit, causing the first supporting part to corrode and erode the current color light-emitting unit, resulting in dark spots in the pixels, thereby improving the display performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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.

[0038] Figure 1 is a schematic diagram of a related display panel;

[0039] Figure 2 is a schematic diagram of a hierarchical structure of a related display panel;

[0040] Figure 3 A schematic diagram of the layer structure of a display panel provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0042] Figure 5 A schematic diagram of an isolation structure in a display panel provided in an embodiment of the present application;

[0043] Figure 6 A schematic diagram of an isolation structure in a display panel provided in another embodiment of the present application;

[0044] Figure 7 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0045] Figure 8 A flow chart of a method for preparing a display panel is provided for another embodiment of the present application;

[0046] Figures 9a to 9f FIG. 4 is a schematic diagram of a method for manufacturing a display panel in another embodiment of the present application.

[0047] Marking Description:

[0048] 100. Display panel;

[0049] 1. Substrate;

[0050] 2. Isolation structure; 21. Isolation opening;

[0051] 3. Light-emitting unit; 31. First electrode; 32. Light-emitting layer; 33. Second electrode;

[0052] 4. The first encapsulation layer;

[0053] 5. first support portion; 51. first sub-support portion; 52. second sub-support portion; 53. overlapping step;

[0054] 6. second support portion; 61. first surface; 62. second surface; 63. first side surface; 64. first protective layer; 65. first metal layer; 651. second side surface; 66. second protective layer;

[0055] 7. pixel definition layer; 71. pixel opening;

[0056] 8. The first supporting layer. DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] Reference Figure 1-2 As shown, it is a structural schematic diagram 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 the 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 above-mentioned isolation opening 21 also includes a plurality of types of openings for accommodating different light-emitting units 3.

[0060] Among them, an isolation structure 2 is set at the gap between the light-emitting units 3 to separate the functional film layers of adjacent light-emitting units 3. In this way, in the evaporation process of multiple functional film layers, it is only necessary to perform 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.

[0061] After long-term research, the inventors found that the bonding force between the side 22 of the isolation structure 2 and the first encapsulation layer 4 is poor, resulting in the liquid entering from between the side 22 of the isolation structure 2 and the first encapsulation layer 4 when wet etching is performed on the area outside the current color light-emitting unit 3, causing the isolation structure 2 to corrode and erode the light-emitting material of the current color light-emitting unit 3, resulting in dark spots in the pixels.

[0062] Based on this, the present application provides a display panel solution, as detailed in the following embodiments.

[0063] Reference Figure 3 As shown, an embodiment of the present application discloses a display panel 100, which includes a substrate 1 and an isolation structure 2. The isolation structure 2 is arranged on one side of the substrate 1, and the isolation structure 2 encloses a plurality of isolation openings 21 for accommodating the light-emitting unit 3. The isolation structure 2 includes a first supporting portion 5 and a second supporting portion 6. The second supporting portion 6 is located on a side of the first supporting portion 5 away from the substrate 1.

[0064] The second support portion 6 includes a first surface 61 and a second surface 62 that are oppositely arranged, and the second surface 62 is located between the substrate 1 and the first surface 61 ; the second support portion 6 also includes a first side surface 63 connecting the first surface 61 and the second surface 62 , and the first side surface 63 is provided with a concave-convex structure.

[0065] Preferably, the orthographic projection of the first support portion 5 on the substrate 1 is located within the orthographic projection of the second support portion 6 on the substrate 1, so that the isolation structure 2 forms a structure that is larger at the top and smaller at the bottom, which can better block the light-emitting layer of the adjacent light-emitting unit 3 to reduce the current crosstalk problem of the adjacent light-emitting unit 3.

[0066] The isolation structure 2 in the display panel 100 provided in this embodiment includes a first support part 5 and a second support part 6. A concave-convex structure is arranged on the side of the second support part 6. The concave-convex structure can enhance the bonding force between the side of the second support part 6 and the encapsulation layer, thereby preventing the liquid from entering from the side of the second support part 6 and the encapsulation layer when wet etching is performed on the area outside the current color light-emitting unit 3, causing the first support part 5 to corrode and erode the current color light-emitting unit 3, resulting in dark spots in the pixels, thereby improving the display performance of the display panel 100.

[0067] Exemplarily, the light-emitting unit R is first made, and after the encapsulation layer is formed, the area outside the light-emitting unit R is dry-etched to remove the encapsulation layer in the area outside the light-emitting unit R, and then the area outside the light-emitting unit R is wet-etched to remove the light-emitting material and the electrode in the area outside the light-emitting unit R, and then the light-emitting unit B and the light-emitting unit G are made. Among them, the manufacturing order of the light-emitting unit R, the light-emitting unit B and the light-emitting unit G can be adjusted as needed, and there is no specific limitation. In this embodiment, by providing a concave-convex structure on the side of the second support portion 6, the contact area between the first side surface 63 and the encapsulation layer is increased, and the bonding force between the first side surface 63 and the encapsulation layer is improved, so as to avoid that when the area outside the current color light-emitting unit is wet-etched, the liquid enters from the side of the second support portion 6 and the encapsulation layer, causing the first support portion 5 to corrode and erode the current color light-emitting unit, resulting in dark spots in the pixels.

[0068] In one embodiment, the isolation opening 21 includes a first type of opening, a second type of opening, and a third type of opening, and the first type of opening, the second type of opening, and the third type of opening respectively define light-emitting units 3 with different colors of emitted light, thereby improving the richness of the display of the display panel 100. Exemplarily, the light-emitting units of different colors include light-emitting unit R, light-emitting unit B, and light-emitting unit G. Further, the first type of opening, the second type of opening, and the third type of opening can be set as needed, and their shapes and sizes may be different, and are not specifically limited.

[0069] Reference Figure 5 As shown, in one embodiment, the display panel 100 further includes a first encapsulation layer 4, the first encapsulation layer 4 covers the isolation structure 2 and the light-emitting unit 3, the first encapsulation layer 4 is connected to the concave-convex structure, and the first encapsulation layer 4 is used to protect the isolation structure 2 and the light-emitting unit 3. Furthermore, the first encapsulation layer 4 is an inorganic layer, and the inorganic layer has a high density to isolate water and oxygen. In a specific embodiment, the display panel 100 further includes a second encapsulation layer and a third encapsulation layer, the second encapsulation layer is located on the side of the first encapsulation layer 4 away from the substrate 1, and the third encapsulation layer is located on the side of the second encapsulation layer away from the substrate 1. The second encapsulation layer is an organic layer, so it has a large thickness to flatten the surface of the display panel, and the third encapsulation layer is an inorganic layer, realizing inorganic-organic-inorganic three-layer encapsulation.

[0070] Reference Figure 5 As shown, in one embodiment, the second supporting portion 6 includes a first protective layer 64, a first metal layer 65 and a second protective layer 66 which are stacked and sequentially arranged away from the substrate 1, the first side surface 63 includes a second side surface 651 located on the first metal layer 65, and the concave-convex structure is arranged on the second side surface 651.

[0071] Wherein, wet etching is required when preparing the first support portion 5 , and the first protective layer 64 and the second protective layer 66 are used to protect the first metal layer 65 to avoid etching the first metal layer 65 when the first support portion 5 is wet-etched.

[0072] Preferably, the material of the first protective layer 64 and the second protective layer 66 includes titanium, that is, the first protective layer 64 and the second protective layer 66 are conductive film layers; alternatively, the first protective layer 64 and the second protective layer 66 can also be selectively designed as non-conductive material film layers (such as inorganic film layers).

[0073] Preferably, the material of the first metal layer 65 includes aluminum, etc., which can ensure good conductivity. The second electrodes of the light-emitting units 3 are connected in series through the first metal layer 65, so that the first metal layer 65 and the second electrodes of the light-emitting units 3 constitute a common electrode for easy driving.

[0074] In one embodiment, the concavo-convex structure includes burrs, which can improve the bonding force between the side of the second support portion 6 and the encapsulation layer. Specifically, when preparing the first encapsulation layer 4, the burrs can be embedded in the first encapsulation layer 4, thereby improving the bonding force between the side of the second support portion 6 and the encapsulation layer.

[0075] Preferably, the material of the second support portion 6 includes metal, and the burrs are formed by oxidation of the metal when it is exposed to air. Specifically, the first support portion 5 is first formed by wet etching, and then the first side surface 63 on the second support portion 6 is exposed to air to avoid etching the metal material of the second support portion 6 during wet etching.

[0076] Please continue to refer to Figure 3 As shown, in one embodiment, the light-emitting unit 3 includes a first electrode 31, a light-emitting layer 32, and a second electrode 33 sequentially stacked on the substrate 1, and the light-emitting layer 32 and the second electrode 33 are located in the isolation opening 21. 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, so as to drive the light-emitting layer 32 to emit light.

[0077] Please continue to refer to Figure 3 As shown, in one embodiment, the display panel 100 also includes a pixel defining layer 7, which is located between the isolation structure 2 and the substrate 1, and the pixel defining layer 7 is defined by a plurality of pixel openings 71 corresponding to the isolation openings 21 respectively, and the pixel openings 71 are connected to the corresponding isolation openings 21, and the orthographic projection of the pixel opening 71 on the substrate 1 is located within the orthographic projection of the corresponding isolation opening 21 on the substrate 1, and the pixel defining layer 7 covers the gaps between adjacent first electrodes 31 and the edges of the first electrodes 31, so that the pixel openings 71 expose the first electrodes 31.

[0078] The pixel defining layer 7 determines the shape and position of the light emitting unit 3 and isolates 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.

[0079] Please refer to Figure 6 and 7 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, 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, and the second electrode 33 overlaps the first sub-support portion 51, which is beneficial to ensure the stability of the electrical connection between the second electrode and the first support portion 5.

[0080] Preferably, a overlapping step 53 is provided on the second sub-support portion 52, and the edge of the second electrode 33 overlaps the overlapping step 53. The overlapping step 53 can realize that the second electrode 33 is electrically connected to the first sub-support portion 51 and the second sub-support portion 52 at the same time, thereby improving the electrical connection effect between the second electrode and the first support portion 5.

[0081] Preferably, the material of the second sub-support portion 52 includes aluminum or the like, and the material of the first sub-support portion 51 includes molybdenum or the like.

[0082] Based on the same inventive concept, Figure 8 As shown, another embodiment of the present application discloses a method for preparing a display panel, and the method for preparing a display panel includes the following steps:

[0083] Step S10, sequentially forming a stacked first support layer 8, a first protective layer 64 and a first metal layer 65 on one side of the substrate 1; Figure 9a .

[0084] Step S20, patterning the first metal layer 65; Figure 9b .

[0085] Step S30, forming a second protective layer 66 on the patterned first metal layer 65 and on the first protective layer 64 in the area not covered by the first metal layer 65; Fig.9c .

[0086] Step S40, patterning the first protective layer 64 and the second protective layer 66, removing the first protective layer 64 and the second protective layer 66 in the area not covered by the first protective layer 64 on the first supporting layer, and retaining the second protective layer 66 on the second side surface 651 of the first metal layer 65; wherein the second side surface 651 is the surface of the first metal layer 65 connecting the first protective layer 64 and the second protective layer 66; refer to Figure 9d Optionally, the first protective layer 64 and the second protective layer 66 are patterned by dry etching.

[0087] Step S50, patterning the first support layer 8 to form a first support portion 5; the orthographic projection of the first support portion 5 on the substrate 1 is located within the orthographic projection of the patterned first metal layer 65 on the substrate 1; Fig.9e Optionally, the first supporting layer 8 is patterned by dry etching to form the first supporting portion 5 .

[0088] Step S60, patterning the second protective layer 66, removing the second protective layer 66 on the second side 651, exposing the second side 651 to the air to form burrs, so as to form an isolation structure 2, the isolation structure 2 encloses a plurality of isolation openings 21 for accommodating the light-emitting unit 3; Figure 9f At this time, the first protective layer 64 , the first metal layer 65 and the second protective layer 66 form the second supporting portion 6 .

[0089] The isolation structure 2 in the display panel 100 provided in this embodiment includes a first support part 5 and a second support part 6. A concave-convex structure is arranged on the side of the second support part 6. The concave-convex structure can enhance the bonding force between the side of the second support part 6 and the encapsulation layer, thereby preventing the liquid from entering from the side of the second support part 6 and the encapsulation layer when wet etching is performed on the area outside the current color light-emitting unit 3, causing the first support part 5 to corrode and erode the current color light-emitting unit 3, resulting in dark spots in the pixels, thereby improving the display performance of the display panel 100.

[0090] In one embodiment, the method for preparing the display panel 100 further includes the following steps:

[0091] Step S70, forming a first encapsulation layer 4 on the isolation structure 2 and in the isolation opening 21, wherein the first encapsulation layer 4 is connected to the second side surface 651; Figure 7 .

[0092] Preferably, step S60, removing the second protective layer 66 on the second side surface 651 of the first metal layer 65, further includes the following steps:

[0093] The first protective layer 64 is patterned so that the side surface of the first protective layer 64, the side surface of the second protective layer 66 and the second side surface 651 form a first side surface 63, and the first side surface 63 is a plane. That is, the side surface of the first protective layer 64, the side surface of the second protective layer 66 and the second side surface 651 form a complete plane.

[0094] 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.

[0095] 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.).

[0096] The display device in this embodiment has an isolation structure 2 in the display panel 100, which includes a first support portion 5 and a second support portion 6. A concave-convex structure is provided on the side of the second support portion 6. The concave-convex structure can enhance the bonding force between the side of the second support portion 6 and the encapsulation layer, thereby preventing the liquid from entering between the side of the second support portion 6 and the encapsulation layer when wet etching is performed on the area outside the current color light-emitting unit 3, causing the first support portion 5 to corrode and erode the current color light-emitting unit 3, resulting in dark spots in the pixels, thereby improving the display performance of the display panel 100 and thus improving the performance of the display device.

[0097] Patent applications PCT / CN2023 / 134518, 202310759370.2, 202310740412.8, 202310707209.0, and 202311346196.5 record relevant technical solutions of the isolation structure 2, and their contents are incorporated into this application by reference for reference.

[0098] 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.

[0099] 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.

[0100] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate; An isolation structure, disposed on one side of the substrate, the isolation structure encloses a plurality of isolation openings for accommodating the light-emitting units, the isolation structure comprises a first supporting portion and a second supporting portion, the second supporting portion being located on a side of the first supporting portion away from the substrate; The second supporting portion includes a first surface and a second surface that are arranged opposite to each other, and the second surface is located between the substrate and the first surface; the second supporting portion also includes a first side surface connecting the first surface and the second surface, and the first side surface is provided with a concave-convex structure.

2. The display panel according to claim 1, wherein: The second supporting portion includes a first protective layer, a first metal layer, and a second protective layer which are stacked and sequentially arranged away from the substrate, the first side surface includes a second side surface located on the first metal layer, and the concavo-convex structure is arranged on the second side surface; Preferably, the material of the first protective layer and the second protective layer includes titanium, and the material of the first metal layer includes aluminum.

3. The display panel according to claim 1 or 2, characterized in that: The concavo-convex structure includes burrs; Preferably, the material of the second supporting portion includes metal, and the burrs are formed by oxidation of the metal when it is exposed to air.

4. The display panel according to claim 1, wherein: The light-emitting unit comprises a first electrode, a light-emitting layer and a second electrode sequentially stacked on the substrate, and the light-emitting layer and the second electrode are located in the isolation opening; Preferably, the display panel also includes a pixel defining layer, which is located between the isolation structure and the substrate, and the pixel defining layer defines a plurality of pixel openings corresponding to the isolation openings respectively, and the pixel openings are connected to the corresponding isolation openings, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the corresponding isolation opening on the substrate, and the pixel defining layer covers the gaps between adjacent first electrodes and the edges of the first electrodes, so that the pixel openings expose the first electrodes.

5. The display panel according to claim 4, 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, 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, and the second electrode overlaps the first sub-supporting portion; Preferably, a lap step is provided on the second sub-support portion, and an edge of the second electrode overlaps the lap step; Preferably, the material of the second sub-support portion includes aluminum, and the material of the first sub-support portion includes molybdenum.

6. The display panel according to claim 1, wherein: The display panel further includes a first encapsulation layer, the first encapsulation layer covers the isolation structure and the light-emitting unit, and the first encapsulation layer is connected to the concave-convex structure.

7. The display panel according to claim 1, wherein: The isolation openings include a first type of openings, a second type of openings and a third type of openings, and the first type of openings, the second type of openings and the third type of openings respectively define the light-emitting units with different colors of emitted light.

8. A method for preparing a display panel, characterized in that: include: sequentially forming a stacked first support layer, a first protective layer and a first metal layer on one side of the substrate; Patterning the first metal layer; forming a second protective layer on the patterned first metal layer and on the first protective layer in an area not covered by the first metal layer; Patterning the first protective layer and the second protective layer, removing the first protective layer and the second protective layer in the area on the first supporting layer not covered by the first protective layer, and retaining the second protective layer on the second side surface of the first metal layer; wherein the second side surface is a surface on the first metal layer connecting the first protective layer and the second protective layer; The first supporting layer is patterned to form a first supporting portion; the orthographic projection of the first supporting portion on the substrate is located within the orthographic projection of the patterned first metal layer on the substrate; The second protective layer is patterned, and the second protective layer on the second side is removed, so that the second side is exposed to the air to form burrs, so as to form an isolation structure, and the isolation structure encloses a plurality of isolation openings for accommodating light-emitting units.

9. The method for preparing a display panel according to claim 8, wherein: The method for preparing the display panel further includes: forming a first encapsulation layer on the isolation structure and in the isolation opening, wherein the first encapsulation layer is connected to the second side surface; Preferably, the second protective layer on the second side surface of the first metal layer is removed, and then the method further comprises: Patterning the first protective layer so that a side surface of the first protective layer, a side surface of the second protective layer and the second side surface form a first side surface, and the first side surface is a plane; Preferably, the patterning of the first protective layer and the second protective layer includes: Patterning the first protective layer and the second protective layer by dry etching; Preferably, the step of patterning the first supporting layer to form a first supporting portion includes: The first supporting layer is patterned by dry etching to form a first supporting portion.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 7.

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