Display panel, preparation method thereof and display device

Abstract

The invention relates to a display panel, a preparation method thereof and a display device. The display panel includes: a substrate; the auxiliary electrode is arranged on one side of the substrate; the undercut structure is arranged on one side of the substrate; the undercut structure comprises a first sub-part and a second sub-part which are stacked in the direction away from the substrate; the end part of the second sub-part protrudes out of the side surface of the first sub-part, and the protruding end part of the second sub-part and the side surface of the first sub-part are encircled to form a bottom notch; the auxiliary structure is arranged at the bottom notch of the partial bottom cutting structure; the light-emitting functional layer is arranged on one side of the substrate; part of the light-emitting functional layer covers part of the auxiliary electrode and exposes part of the auxiliary electrode; and the first electrode is arranged on one side, far away from the substrate, of the light-emitting functional layer and extends to the exposed auxiliary electrode by means of the auxiliary structure so as to be electrically connected with the auxiliary electrode. The electric connection performance of the first electrode and the auxiliary electrode can be 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] OLED (Organic Light-Emitting Diode) displays have the advantages of being foldable, bendable, and having narrow bezels, and have broad application prospects. With the continuous development of display technology, the demand for large-size display screens is increasing. In some technologies, the larger the screen size of the OLED display panel, the larger the size of the cathode, and the larger the size of the cathode, the greater the resistance of the cathode, which in turn makes the voltage drop (IR drop) on the cathode greater, affecting the uniformity of the screen display and increasing the display power consumption. In response to the above problems, the related technology uses auxiliary electrode technology to overlap the auxiliary electrode with the cathode. However, the electrical connection performance between the cathode and the auxiliary electrode needs to be improved. Summary of the invention

[0003] Based on this, it is necessary to provide a display panel and a manufacturing method thereof, and a display device that can improve the electrical connection performance between the first electrode and the auxiliary electrode.

[0004] In a first aspect, an embodiment of the present application provides a display panel, including:

[0005] substrate;

[0006] An auxiliary electrode, disposed on one side of the substrate;

[0007] An undercut structure is provided on one side of the substrate; the undercut structure comprises a first sub-section and a second sub-section stacked in a direction away from the substrate; an end of the second sub-section protrudes from a side surface of the first sub-section, and the protruding end of the second sub-section and the side surface of the first sub-section are combined to form an undercut;

[0008] a light-emitting functional layer, arranged on one side of the substrate, the light-emitting functional layer covers a portion of the auxiliary electrode and exposes a portion of the auxiliary electrode; the orthographic projection of the protruding end of the second sub-portion on the substrate covers the orthographic projection of the exposed auxiliary electrode on the substrate;

[0009] An auxiliary structure, provided at the undercut of part of the undercut structure;

[0010] The first electrode is arranged on a side of the light-emitting functional layer away from the substrate, and is extended to the exposed auxiliary electrode by means of the auxiliary structure to be electrically connected to the auxiliary electrode.

[0011] In one embodiment, the auxiliary structure has a slope, the slope surface of the slope intersects with the thickness direction of the substrate, and the first electrode extends to the exposed auxiliary electrode via the slope surface of the slope;

[0012] Optionally, part of the auxiliary structure fills part of the undercut of the undercut structure;

[0013] Optionally, the auxiliary structure also covers a portion of the surface of the second sub-portion on a side away from the first sub-portion.

[0014] In one embodiment, the display panel further comprises a pixel defining layer, the light-emitting functional layer comprises a plurality of light-emitting portions, a plurality of pixel openings are provided on the pixel defining layer, and the light-emitting portions are arranged corresponding to the pixel openings;

[0015] The auxiliary structure is arranged on the same layer as the pixel defining layer.

[0016] In one embodiment, the undercut structure comprises an insulating material;

[0017] Optionally, the first sub-section and the second sub-section are both made of insulating materials;

[0018] Optionally, the first sub-section and the second sub-section are made of the same material, and both the first sub-section and the second sub-section are made of organic materials;

[0019] Optionally, the first sub-section and the second sub-section are both inorganic materials;

[0020] Optionally, one of the first sub-section and the second sub-section is an organic material, and the other is an inorganic material;

[0021] Optionally, the first sub-section is a conductive material, and the second sub-section is an insulating material;

[0022] The first sub-portion is a metal oxide material, and the second sub-portion is an inorganic material or an organic material. In one embodiment, the orthographic projection of the undercut structure on the substrate surrounds at least part of the orthographic projection of the auxiliary electrode on the substrate;

[0023] Optionally, the orthographic projection of the first sub-portion on the substrate overlaps with the orthographic projection of the auxiliary electrode on the substrate;

[0024] Optionally, the orthographic projection of the first sub-portion on the substrate covers the orthographic projection edge of the auxiliary electrode on the substrate;

[0025] Optionally, an orthographic projection of the first sub-portion on the substrate is connected to an orthographic projection of the auxiliary electrode on the substrate.

[0026] In one embodiment, the display panel also includes a plurality of second electrodes disposed between the substrate and the light-emitting functional layer, and the plurality of second electrodes are arranged at intervals; the second electrode and the auxiliary electrode are insulated from each other; the auxiliary electrode is electrically connected to a first potential, and the second electrode is electrically connected to a second potential.

[0027] In one embodiment, the auxiliary electrode is disposed in the same layer as the second electrode;

[0028] Optionally, an orthographic projection of the auxiliary electrode on the substrate is spaced apart from an orthographic projection of the second electrode on the substrate.

[0029] In one embodiment, the display panel further comprises an array film layer disposed on one side of the substrate; a second electrode line electrically connected to the second potential is disposed in the array film layer, and the second electrode is electrically connected to the second electrode line;

[0030] Optionally, a first electrode line electrically connected to the first potential is provided in the array film layer, and the auxiliary electrode is electrically connected to the first electrode line;

[0031] Optionally, the first electrode line and the second electrode line are arranged in the same layer and are insulated from each other;

[0032] Optionally, the auxiliary electrode and the second electrode line are arranged in the same layer and are insulated from each other.

[0033] In one of the embodiments, the auxiliary electrode has an orthographic projection on the substrate in the shape of a grid;

[0034] Optionally, the auxiliary electrode comprises an electrode mesh, the electrode mesh comprises a plurality of electrode strips arranged crosswise, and the orthographic projections of the plurality of electrode strips on the substrate are in a grid shape;

[0035] The undercut structure is provided on both sides of at least part of the electrode strips in the width direction;

[0036] Optionally, an orthographic projection of the electrode mesh on the substrate and an orthographic projection of the second electrode on the substrate are arranged at an interval.

[0037] In one embodiment, the auxiliary electrode includes a plurality of electrode portions arranged at intervals, and the display panel includes a plurality of undercut structures arranged corresponding to the plurality of electrode portions;

[0038] The orthographic projection of the undercut structure on the substrate surrounds at least a portion of the orthographic projection of the corresponding electrode portion on the substrate;

[0039] Optionally, the display panel further comprises an array film layer provided on one side of the substrate, a first electrode line electrically connected to a first potential is provided in the array film layer, and the plurality of electrode portions are all electrically connected to the first electrode line;

[0040] Optionally, the orthographic projection of the electrode portion on the substrate is outside the orthographic projection range of the second electrode on the substrate;

[0041] Optionally, the orthographic projection of the second electrode on the substrate is block-shaped;

[0042] Optionally, the orthographic projection of the second electrode on the substrate surrounds the orthographic projection of the electrode portion on the substrate;

[0043] Optionally, the orthographic projection of the second electrode on the substrate is an annular projection, and the annular projection surrounds a portion of the orthographic projection of the electrode portion on the substrate;

[0044] Optionally, at least one auxiliary structure is provided at the undercut of each undercut structure;

[0045] Optionally, a plurality of the auxiliary structures arranged at intervals are provided at the bottom cut of each bottom cut structure.

[0046] In one embodiment, the auxiliary electrode includes an electrode grid and a plurality of electrode portions, the electrode grid includes a plurality of electrode strips arranged crosswise, the orthographic projections of the plurality of electrode strips on the substrate are in a grid shape, and the electrode portions are arranged at the intersections of the electrode strips; the electrode grid and / or the electrode portions are electrically connected to a first potential.

[0047] In a second aspect, an embodiment of the present application provides a method for preparing a display panel, comprising:

[0048] providing a substrate;

[0049] forming an auxiliary electrode on one side of the substrate;

[0050] An undercut structure is formed on one side of the substrate; the undercut structure comprises a first sub-section and a second sub-section stacked in a direction away from the substrate; an end of the second sub-section protrudes from a side surface of the first sub-section, and the protruding end of the second sub-section and the side surface of the first sub-section together form an undercut;

[0051] An auxiliary structure is formed on one side of the substrate; the auxiliary structure is disposed at the bottom cut of a portion of the bottom cut structure;

[0052] A light-emitting functional layer is formed on one side of the substrate; the light-emitting functional layer covers a portion of the auxiliary electrode and exposes a portion of the auxiliary electrode; the orthographic projection of the protruding end of the second sub-portion on the substrate covers the orthographic projection of the exposed auxiliary electrode on the substrate;

[0053] A first electrode is formed on a side of the light-emitting functional layer away from the substrate; wherein the first electrode is further extended to the exposed auxiliary electrode by means of the auxiliary structure to be electrically connected to the auxiliary electrode.

[0054] In a third aspect, an embodiment of the present application provides a display device, comprising the display panel in any embodiment of the first aspect.

[0055] The display panel and its preparation method and display device provided by the embodiments of the present application, by setting the bottom cut structure, on the one hand, when evaporating the light-emitting functional layer, the auxiliary electrode located below the end of the second sub-section can be exposed by controlling the evaporation angle; on the other hand, when evaporating the first electrode, the first electrode can cover the exposed auxiliary electrode by controlling the evaporation angle. By setting the auxiliary structure, the first electrode can be extended to the exposed auxiliary electrode, thereby achieving electrical connection with the auxiliary electrode. Furthermore, the auxiliary structure is conducive to making the thickness of the first electrode uniform and the film layer continuous, thereby helping to reduce the connection resistance between the first electrode and the auxiliary electrode, thereby improving the electrical connection performance between the first electrode and the auxiliary electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] FIG. 1 is a partial plan view of a display panel provided in one embodiment of the present application.

[0058] Figure 2 It is a schematic diagram of the AA cross-sectional structure in Figure 1.

[0059] Figure 3 It is a schematic diagram of the BB cross-sectional structure in Figure 1.

[0060] Figure 4 FIG. 1 is a schematic diagram of the connection between the first electrode and the auxiliary electrode of the display panel shown in FIG. 1 .

[0061] Figure 5 It is a partial plan view of a substrate, an auxiliary electrode and a second electrode of the display panel shown in FIG1 .

[0062] Figure 6 for Figure 5 Schematic diagram of the CC cross-section structure.

[0063] Figure 7 It is a partial plan view of a substrate, an auxiliary electrode, a second electrode and an undercut structure of the display panel shown in FIG1 .

[0064] Figure 8 for Figure 7 Schematic diagram of the DD cross-section structure.

[0065] Fig. 9 It is a partial plan view of the auxiliary electrode, the second electrode, the auxiliary structure, the undercut structure and the pixel defining layer of the display panel shown in FIG1 .

[0066] Fig.10 for Fig. 9 Schematic diagram of the EE cross-sectional structure.

[0067] Fig.11 for Fig. 9 Schematic diagram of the FF cross-sectional structure.

[0068] Fig.12 A partial plan view of an auxiliary electrode, a second electrode, an auxiliary structure, an undercut structure and a pixel defining layer of another display panel provided in one embodiment of the present application.

[0069] Fig.13 for Fig.12 Schematic diagram of the GG cross-sectional structure.

[0070] Fig.14 A partial plan view of an auxiliary electrode, a second electrode, an auxiliary structure, an undercut structure and a pixel defining layer of another display panel provided in an embodiment of the present application.

[0071] Fig.15 for Fig.14 Schematic diagram of the HH cross-sectional structure.

[0072] Fig.16 A partial plan view of an auxiliary electrode, a second electrode, an auxiliary structure, an undercut structure and a pixel defining layer of another display panel provided in an embodiment of the present application.

[0073] Fig.17 for Fig.16 Schematic diagram of the II cross-section structure.

[0074] Fig.18 A partial plan view of an auxiliary electrode, a second electrode, an auxiliary structure, an undercut structure and a pixel defining layer of another display panel provided in an embodiment of the present application.

[0075] Fig.19 for Fig.18 Schematic diagram of the JJ cross-section structure.

[0076] Fig. 20 A partial plan view of an auxiliary electrode, a second electrode, an auxiliary structure, an undercut structure and a pixel defining layer of another display panel provided in an embodiment of the present application.

[0077] Fig.21 for Fig. 20 Schematic diagram of the KK cross-section structure.

[0078] Fig. 22 A partial plan view of an auxiliary electrode, a second electrode, an auxiliary structure, an undercut structure and a pixel defining layer of another display panel provided in an embodiment of the present application.

[0079] Fig.23 for Fig. 22 Schematic diagram of the LL cross-section structure.

[0080] Fig.24 for Fig. 22 Schematic diagram of the MM cross-sectional structure.

[0081] Fig.25 A flow chart of a method for preparing a display panel provided in one embodiment of the present application.

[0082] Description of reference numerals:

[0083] 10. Display panel; 11. Substrate; 12. Auxiliary electrode; 121. Electrode mesh; 1211. Electrode strip; 122. Electrode portion; 13. Bottom cut structure; 13a. Bottom cut; 131. First sub-portion; 132. Second sub-portion; 14. Light-emitting functional layer; 141. Light-emitting portion; 15. Auxiliary structure; 151. Slope; 16. First electrode; 17. Pixel defining layer; 17a. Pixel opening; 18. Second electrode; 19. Array film layer; 191. First electrode line; 192. Second electrode line. DETAILED DESCRIPTION

[0084] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0085] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, they do not represent any order, quantity or importance, but are only used to distinguish different components. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present application, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0087] In the first aspect, referring to FIG. 1, Figure 2 , Figure 3 and Figure 4 As shown, the embodiment of the present application provides a display panel 10, including a substrate 11, an auxiliary electrode 12, an undercut structure 13, a light-emitting functional layer 14, an auxiliary structure 15 and a first electrode 16. The first electrode 16 may be a cathode or an anode. When the first electrode 16 is a cathode, the auxiliary electrode 12 is an auxiliary cathode. When the first electrode 16 is an anode, the auxiliary electrode 12 is an auxiliary anode.

[0088] Specifically, the auxiliary electrode 12 is arranged on one side of the substrate 11. The undercut structure 13 is arranged on one side of the substrate 11. The undercut structure 13 includes a first sub-portion 131 and a second sub-portion 132 stacked in a direction away from the substrate 11. The end of the second sub-portion 132 protrudes from the side of the first sub-portion 131, and the protruding end of the second sub-portion 132 and the side of the first sub-portion 131 are surrounded to form a bottom cut 13a. The light-emitting functional layer 14 is arranged on one side of the substrate 11, and the light-emitting functional layer 14 covers part of the auxiliary electrode 12 and exposes part of the auxiliary electrode 12. The orthographic projection of the protruding end of the second sub-portion 132 on the substrate 11 covers the orthographic projection of the exposed auxiliary electrode 12 on the substrate 11. The auxiliary structure 15 is arranged at the bottom cut 13a of the partial undercut structure 13. The first electrode 16 is arranged on the side of the light-emitting functional layer 14 away from the substrate 11, and extends to the exposed auxiliary electrode 12 with the help of the auxiliary structure 15, so as to be electrically connected to the auxiliary electrode 12.

[0089] Here, the undercut structure 13 is a "large top and small bottom" structure. By setting the undercut structure 13, on the one hand, the evaporated material can be isolated; on the other hand, when evaporating the material, the shielding effect of the undercut structure 13 can be used to expose part of the surface of the auxiliary electrode 12. It can be understood that the display area of ​​the display panel 10 includes a light-emitting area and a non-light-emitting area, wherein the light-emitting position is the light-emitting area, and the auxiliary electrode 12 is arranged in the non-light-emitting area. The light-emitting functional layer 14 covers the light-emitting area and the non-light-emitting area. The light-emitting functional layer 14 may include at least one of a common layer and an organic light-emitting layer.

[0090] The display panel 10 provided in the embodiment of the present application refers to Figure 4 As shown, by providing the undercut structure 13, on the one hand, when evaporating the light-emitting functional layer 14, the evaporation angle of the light-emitting functional layer 14 can be controlled, such as the evaporation angle of the light-emitting functional layer 14 is as shown in FIG. Figure 4 As shown by the dotted line a in the figure, the auxiliary electrode 12 located below the end of the second sub-portion 132 is exposed; on the other hand, when the first electrode 16 is evaporated, the evaporation angle of the first electrode 16 can be controlled, such as the evaporation angle of the first electrode 16 is as shown in FIG. Figure 4 As shown by the dotted line b in FIG. 1 , the first electrode 16 covers the exposed auxiliary electrode 12. Figure 2 As shown, by providing the auxiliary structure 15, during evaporation, the first electrode 16 can be extended to the exposed auxiliary electrode 12, thereby achieving electrical connection with the auxiliary electrode 12. Furthermore, the auxiliary structure 15 is conducive to making the thickness of the first electrode 16 uniform and the film layer continuous, thereby helping to reduce the connection resistance between the first electrode 16 and the auxiliary electrode 12, thereby improving the electrical connection performance between the first electrode 16 and the auxiliary electrode 12. Figure 3 As shown, in the area where the auxiliary structure 15 is not set, during evaporation, the bottom cut structure 13 separates the light-emitting functional layer 14 on the auxiliary electrode 12 from the light-emitting functional layer 14 on the bottom cut structure 13, so that the light-emitting functional layer 14 on the auxiliary electrode 12 and the light-emitting functional layer 14 on the bottom cut structure 13 cannot be connected.

[0091] It can be understood that by providing the auxiliary electrode 12 , the resistance of the first electrode 16 can be reduced, which is not only beneficial to reducing the power consumption of the display panel 10 , but also beneficial to improving the brightness uniformity.

[0092] In one embodiment, referring to Figure 2 As shown, the auxiliary structure 15 has a slope 151, the slope surface of the slope 151 intersects with the thickness direction of the substrate 11, and the first electrode 16 extends to the exposed auxiliary electrode 12 via the slope surface of the slope 151. Here, the slope surface of the slope 151 can be understood as the inclined surface of the slope 151.

[0093] In this way, not only can the first electrode 16 be easily extended from the top of the bottom cut structure 13 to the exposed auxiliary electrode 12, but it is also beneficial to make the thickness of the first electrode 16 uniform and the film layer continuity good, thereby reducing the connection resistance between the first electrode 16 and the auxiliary electrode 12, and further improving the electrical connection performance between the first electrode 16 and the auxiliary electrode 12.

[0094] It is understandable that the auxiliary structure 15 may be disposed only on one side of the undercut structure 13 close to the auxiliary electrode 12 , and the embodiment of the present application does not specifically limit the specific structure of the auxiliary structure 15 .

[0095] It should be noted that the light-emitting functional layer 14 also covers the auxiliary structure 15 , that is, the light-emitting functional layer 14 covers the slope surface of the slope 151 , and the first electrode 16 on the slope 151 is located on the side of the light-emitting functional layer away from the slope 151 .

[0096] In one embodiment, part of the auxiliary structure 15 fills part of the undercut 13a of the undercut structure 13. In this way, the contact surface between the auxiliary structure 15 and the undercut structure 13 can be increased, thereby improving the connection stability between the two.

[0097] In one embodiment, the auxiliary structure 15 also covers a portion of the surface of the second sub-portion 132 away from the first sub-portion 131. In this way, the contact surface between the auxiliary structure 15 and the undercut structure 13 can be further increased, thereby improving the connection stability between the two.

[0098] In one embodiment, referring to Figure 2 As shown, the display panel 10 further includes a pixel defining layer 17, the light-emitting function layer 14 includes a plurality of light-emitting portions 141, and a plurality of pixel openings 17a are provided on the pixel defining layer 17, and the light-emitting portions 141 are arranged corresponding to the pixel openings 17a. The auxiliary structure 15 is arranged in the same layer as the pixel defining layer 17. In this way, when the pixel defining layer 17 is manufactured, the auxiliary structure 15 can be manufactured simultaneously, which is conducive to reducing the manufacturing process of the display panel 10, thereby reducing the manufacturing cost and difficulty.

[0099] It should be noted that the plurality of light-emitting portions 141 include a plurality of first light-emitting portions, a plurality of second light-emitting portions, and a plurality of third light-emitting portions, and the first light-emitting portions, the second light-emitting portions, and the third light-emitting portions are respectively used to emit light of different colors. Exemplarily, the light-emitting functional layer 14 may include a first common layer and a second common layer, the first common layer being disposed between the light-emitting portion 141 and the substrate 11, and the second common layer being disposed on the side of the light-emitting portion 141 facing away from the substrate 11.

[0100] In one embodiment, the display panel 10 further includes a plurality of second electrodes 18 disposed between the substrate 11 and the light-emitting functional layer 14, and the plurality of second electrodes 18 are arranged at intervals. The second electrodes 18 are insulated from the auxiliary electrodes 12; the auxiliary electrodes 12 are electrically connected to the first potential, and the second electrodes 18 are electrically connected to the second potential.

[0101] Specifically, the plurality of second electrodes 18 correspond to the plurality of light emitting portions 141 one by one, and each light emitting portion 141 is disposed on a side of the corresponding second electrode 18 away from the substrate 11. When the first electrode 16 is a cathode, the second electrode 18 is an anode. When the first electrode 16 is an anode, the second electrode 18 is a cathode.

[0102] In one embodiment, the auxiliary electrode 12 is disposed in the same layer as the second electrode 18, and the auxiliary electrode 12 is insulated from the second electrode 18. Thus, when the second electrode 18 is manufactured, the auxiliary electrode 12 can be manufactured simultaneously, which is beneficial to reducing the manufacturing process of the display panel 10, thereby reducing the manufacturing cost and difficulty.

[0103] In one embodiment, referring to Figure 5 and Figure 6 As shown, the auxiliary electrode 12 and the second electrode 18 are formed in the same process. Figure 7 and Figure 8 As shown, the undercut structure 13 is then made. In further reference, Fig. 9 , Fig.10 and Fig.11 As shown, the pixel defining layer 17 and the auxiliary structure 15 are then simultaneously manufactured.

[0104] In one embodiment, the undercut structure 13 includes an insulating material, which is beneficial for the undercut structure 13 to have a better insulating property and reduces the possibility of electrical crosstalk between the auxiliary electrode 12 and other metal film layers.

[0105] In one embodiment, the first sub-portion 131 and the second sub-portion 132 are both made of insulating materials. In this way, the undercut structure 13 can have good insulating properties, so that the auxiliary electrode 12 can be separated from other metal film layers by the undercut structure 13 to prevent electrical crosstalk.

[0106] In one embodiment, the first sub-portion 131 and the second sub-portion 132 are made of the same material, and both the first sub-portion 131 and the second sub-portion 132 are made of organic materials. In this way, the undercut structure 13 is made of the same material, which can reduce the manufacturing cost of the undercut structure 13. Exemplarily, the undercut structure 13 can be made by photoresist.

[0107] Furthermore, when the undercut structure 13 is made of the same organic material, the cross-sectional shape of the undercut structure 13 may be an inverted trapezoid.

[0108] In one embodiment, the first sub-portion 131 and the second sub-portion 132 are made of different materials. In this way, the morphology of the undercut structure 13 can be formed by selective etching.

[0109] In one embodiment, the first sub-portion 131 and the second sub-portion 132 are made of different materials, and both the first sub-portion 131 and the second sub-portion 132 are made of inorganic materials. In this way, the morphology of the undercut structure 13 can be formed by selective etching. Exemplarily, the first sub-portion 131 is a silicon nitride layer, and the second sub-portion 132 is a silicon oxide layer. Alternatively, the first sub-portion 131 is a silicon nitride layer, and the second sub-portion 132 is an inorganic pixel definition layer material.

[0110] In one embodiment, when the materials of the first sub-portion 131 and the second sub-portion 132 are different, one of the first sub-portion 131 and the second sub-portion 132 may be an organic material and the other may be an inorganic material. In this way, the morphology of the undercut structure 13 may be formed by selective etching. For example, the first sub-portion 131 is a silicon nitride layer and the second sub-portion 132 is an organic pixel definition layer material.

[0111] In one embodiment, the first sub-portion 131 is a conductive material, and the second sub-portion 132 is an insulating material. In this way, the morphology of the undercut structure 13 can be formed by selective etching. It should be noted that when the first sub-portion 131 is a conductive material, the first sub-portion 131 does not contact the second electrode 18, so that the two are insulated.

[0112] In one embodiment, the first sub-section 131 is a metal oxide material, and the second sub-section 132 is an inorganic material or an organic material. Exemplarily, the material of the first sub-section 131 is indium gallium zinc oxide (IGZO), and the second sub-section 132 is an organic pixel definition layer material or an inorganic pixel definition layer material.

[0113] In one embodiment, the orthographic projection of the undercut structure 13 on the substrate 11 surrounds at least part of the orthographic projection of the auxiliary electrode 12 on the substrate 11. In this way, it can be ensured that a part of the auxiliary electrode 12 is located at the bottom cut 13a of the undercut structure 13, so that when the light-emitting functional layer 14 is evaporated, the undercut structure 13 can form a barrier to ensure that the part of the auxiliary electrode 12 located at the bottom cut 13a can be exposed, so as to facilitate the electrical connection of the first electrode 16.

[0114] In one embodiment, the orthographic projection of the undercut structure 13 on the substrate 11 surrounds the entire orthographic projection of the auxiliary electrode 12 on the substrate 11. That is, the entire periphery of the auxiliary electrode 12 is surrounded by the undercut structure 13. In this way, when the light-emitting functional layer 14 is evaporated, the exposed area of ​​the auxiliary electrode 12 can be larger, which is beneficial to reduce the electrical connection resistance between the first electrode 16 and the auxiliary electrode 12.

[0115] In one embodiment, the orthographic projection of the first sub-portion 131 on the substrate 11 overlaps with the orthographic projection of the auxiliary electrode 12 on the substrate 11. This helps to reduce the occupied area of ​​the undercut structure 13 and the auxiliary electrode 12 in the display area, thereby improving the aperture ratio.

[0116] In one embodiment, the orthographic projection of the first sub-portion 131 on the substrate 11 covers the orthographic projection edge of the auxiliary electrode 12 on the substrate 11. In this way, the undercut structure 13 can wrap the edge of the auxiliary electrode 12, which is conducive to the undercut structure 13 of the insulating material to isolate the auxiliary electrode 12 from other metal film layers, thereby reducing the possibility of electrical crosstalk.

[0117] In one embodiment, the orthographic projection of the first sub-portion 131 on the substrate 11 is connected to the orthographic projection of the auxiliary electrode 12 on the substrate 11. In this way, the undercut structure 13 can wrap the edge of the auxiliary electrode 12, which is conducive to the undercut structure 13 of the insulating material to isolate the auxiliary electrode 12 from other metal film layers, thereby reducing the possibility of electrical crosstalk.

[0118] In one embodiment, referring to Figure 5 As shown, the orthographic projection of the auxiliary electrode 12 on the substrate 11 is spaced apart from the orthographic projection of the second electrode 18 on the substrate 11. This helps to insulate the auxiliary electrode 12 from the second electrode 18 and avoid electrical interference between the two.

[0119] In one embodiment, referring to Fig.12 and Fig.13 As shown, the display panel 10 further includes an array film layer 19 disposed on one side of the substrate 11; a second electrode line 192 electrically connected to the second potential is disposed in the array film layer 19, and the second electrode 18 is electrically connected to the second electrode line 192. Specifically, the orthographic projection of the second electrode 18 on the substrate 11 overlaps with the orthographic projection of the second electrode line 192 on the substrate.

[0120] In one embodiment, referring to Fig.14 , Fig.15 , Fig.16 , Fig.17As shown, the array film layer 19 is provided with a first electrode line 191 electrically connected to the first potential, and the auxiliary electrode 12 is electrically connected to the first electrode line 191. Specifically, the orthographic projection of the auxiliary electrode 12 on the substrate 11 overlaps with the orthographic projection of the first electrode line 191 on the substrate.

[0121] In one embodiment, referring to Fig.15 As shown, the first electrode lines 191 and the second electrode lines 192 are disposed in the same layer and insulated from each other. In this way, the first electrode lines 191 and the second electrode lines 192 can be manufactured simultaneously, which is beneficial to reducing the manufacturing process of the display panel 10, thereby reducing the manufacturing cost and difficulty.

[0122] In one embodiment, referring to Fig.18 and Fig.19 As shown, the auxiliary electrode 12 and the second electrode line 192 are disposed in the same layer and insulated from each other. Thus, when the second electrode line 192 is manufactured, the auxiliary electrode 12 can be manufactured simultaneously, which is beneficial to reduce the manufacturing process of the display panel 10, thereby reducing the manufacturing cost and difficulty.

[0123] In one embodiment, the orthographic projection of the auxiliary electrode 12 on the substrate 11 is in a grid shape. This is beneficial to increasing the area of ​​the auxiliary electrode 12, thereby reducing resistance, and is beneficial to separating the auxiliary electrode 12 from the second electrode 18, so that the two are insulated.

[0124] In one embodiment, referring to Fig.12 As shown, the auxiliary electrode 12 includes an electrode mesh 121, and the electrode mesh 121 includes a plurality of electrode strips 1211 arranged crosswise, and the orthographic projections of the plurality of electrode strips 1211 on the substrate 11 are in a grid shape. It should be noted that, Fig.12 Only a partial structure of the auxiliary electrode 12 is shown. The overall structure of the auxiliary electrode 12 is in a grid shape, and the second electrode 18 is located in the mesh. At least part of the electrode strips 1211 are provided with undercut structures 13 on both sides in the width direction. In this way, when the light-emitting functional layer 14 is evaporated, the exposed area of ​​the auxiliary electrode 12 can be larger, which is conducive to reducing the electrical connection resistance between the first electrode 16 and the auxiliary electrode 12.

[0125] In one embodiment, the orthographic projection of the undercut structure 13 on the substrate 11 surrounds the entire orthographic projection of the electrode mesh 121 on the substrate 11. In this way, when the light-emitting functional layer 14 is evaporated, the exposed area of ​​the auxiliary electrode 12 can be larger, which is beneficial to reduce the electrical connection resistance between the first electrode 16 and the auxiliary electrode 12.

[0126] For example, Fig.12 As shown, the auxiliary structure 15 can be arranged at the intersection of the electrode strips 1211 , so as to improve the electrical connection performance between the first electrode 16 and the auxiliary electrode 12 .

[0127] In one embodiment, the orthographic projection of the electrode mesh 121 on the substrate 11 is spaced from the orthographic projection of the second electrode 18 on the substrate 11. It can be understood that the area where the second electrode 18 is located is the light-emitting area of ​​the light-emitting portion 141. The above arrangement can prevent the auxiliary electrode 12 from interfering with the electrical connection between the second electrode 18 and the light-emitting portion 141, thereby avoiding the auxiliary electrode 12 from interfering with the light emission of the light-emitting portion 141.

[0128] In one embodiment, the auxiliary electrode 12 includes at least one electrode portion 122, and the display panel 10 includes at least one undercut structure 13; the electrode portion 122 corresponds to the undercut structure 13 one by one. The orthographic projection of the undercut structure 13 on the substrate 11 surrounds at least part of the orthographic projection of the corresponding electrode portion 122 on the substrate 11. In this way, when the light-emitting functional layer 14 is evaporated, the exposed area of ​​the auxiliary electrode 12 can be larger, which is beneficial to reduce the electrical connection resistance between the first electrode 16 and the auxiliary electrode 12.

[0129] In one embodiment, the auxiliary electrode 12 includes a plurality of electrode portions 122 arranged at intervals, and the display panel 10 includes a plurality of undercut structures 13 arranged corresponding to the plurality of electrode portions 122. The orthographic projection of the undercut structure 13 on the substrate 11 surrounds at least a portion of the orthographic projection of the corresponding electrode portion 122 on the substrate 11. In this way, the resistance of the first electrode 16 is further reduced, which not only reduces the power consumption of the display panel 10, but also improves the brightness uniformity.

[0130] In one embodiment, if Fig.14 and Fig.15 As shown, the orthographic projection of the undercut structure 13 on the substrate 11 surrounds the orthographic projection center of the corresponding electrode portion 122 on the substrate 11. In this way, the exposed area of ​​the auxiliary electrode 12 can be larger, which is beneficial to reduce the electrical connection resistance between the first electrode 16 and the auxiliary electrode 12.

[0131] Furthermore, the orthographic projection of the undercut structure 13 on the substrate 11 covers the orthographic projection edge of the corresponding electrode portion 122 on the substrate 11. In this way, the undercut structure 13 can wrap the edge of the electrode portion 122, which is conducive to the undercut structure 13 of the insulating material to isolate the electrode portion 122 from other metal film layers, thereby reducing the possibility of electrical crosstalk.

[0132] In one embodiment, if Fig.15As shown, the display panel 10 further includes an array film layer 19 disposed on one side of the substrate 11, and a first electrode line 191 electrically connected to the first potential is disposed in the array film layer 19, and a plurality of electrode portions 122 are electrically connected to the first electrode line 191. In this way, all the electrode portions 122 can be connected through the first electrode line 191, thereby forming a mesh-like conductive structure.

[0133] In one embodiment, the orthographic projection of the electrode portion 122 on the substrate 11 is spaced from the orthographic projection of the second electrode 18 on the substrate 11. It can be understood that the area where the second electrode 18 is located is the light-emitting area of ​​the light-emitting portion 141. The above arrangement can prevent the auxiliary electrode 12 from interfering with the electrical connection between the second electrode 18 and the light-emitting portion 141, thereby avoiding the auxiliary electrode 12 from interfering with the light emission of the light-emitting portion 141.

[0134] Alternatively, if Fig.14 , Fig.15 Fig.18 and Fig.19 As shown, the orthographic projection of the electrode portion 122 on the substrate 11 is outside the orthographic projection range of the second electrode 18 on the substrate 11 .

[0135] In one embodiment, referring to Figure 5 , Fig.12 and Fig.14 As shown, the orthographic projection of the second electrode 18 on the substrate 11 is a block shape. This is helpful to reduce the difficulty of manufacturing the second electrode 18.

[0136] In one embodiment, referring to Fig.16 and Fig. 20 As shown, the orthographic projection of the second electrode 18 on the substrate 11 surrounds the orthographic projection of the electrode portion 122 on the substrate 11. In this way, the compactness of the arrangement of the second electrode 18 and the auxiliary electrode 12 is improved, thereby improving the aperture ratio.

[0137] In one embodiment, referring to Fig. 20 and Fig.21 As shown, the orthographic projection of the second electrode 18 on the substrate 11 is a ring-shaped projection, and the ring-shaped projection surrounds the partial orthographic projection of the electrode portion 122 on the substrate 11. Further, the partial orthographic projection of the electrode portion 122 on the substrate 11 overlaps with the ring-shaped projection.

[0138] It should be noted that the annular projection has an inner contour and an outer contour. The outer contour of the orthographic projection of the second electrode 18 can be a circle, rectangle, pentagon, hexagon or the like. The inner contour of the orthographic projection of the second electrode 18 can be a circle, rectangle, pentagon, hexagon or the like. In one example, the outer contour of the orthographic projection of the second electrode 18 is a rectangle, and the inner contour of the orthographic projection of the second electrode 18 is a circle.

[0139] In one embodiment, referring to Figure 16-Figure 24 As shown, at least one auxiliary structure 15 is disposed at the bottom cut 13a of each bottom cut structure 13. Specifically, at least one auxiliary structure 15 is disposed on the side of each electrode portion 122 away from the substrate 11, and the at least one auxiliary structure 15 is disposed at a part of the bottom cut 13a of the bottom cut structure 13 corresponding to the electrode portion 122. In this way, it is ensured that the first electrode 16 can extend to the exposed auxiliary electrode 12 through the auxiliary structure 15, thereby achieving electrical connection with the auxiliary electrode 12.

[0140] In one embodiment, referring to Fig. 22 , Fig.23 and Fig.24 As shown, a plurality of auxiliary structures 15 arranged at intervals are provided at the bottom cutout 13a of each bottom cut structure 13. Specifically, a plurality of auxiliary structures 15 are provided on a side of each electrode portion 122 away from the substrate 11, and the plurality of auxiliary structures 15 are spaced apart. In this way, the area of ​​the first electrode 16 located on the auxiliary structure 15 can be increased, thereby facilitating the reduction of the connection resistance between the first electrode 16 and the auxiliary electrode 12.

[0141] Specifically, two auxiliary structures 15 are disposed at the undercut 13 a of the undercut structure 13 , and the two auxiliary structures 15 are disposed opposite to each other.

[0142] It should be noted that the auxiliary electrode 12 may include only the electrode mesh 121 but not the electrode portion 122. The auxiliary electrode 12 may include only the electrode portion 122 but not the electrode mesh 121. The auxiliary electrode 12 may include both the electrode mesh 121 and the electrode portion 122.

[0143] In one embodiment, referring to Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the auxiliary electrode 12 includes an electrode mesh 121 and a plurality of electrode portions 122. The electrode mesh 121 includes a plurality of electrode strips 1211 arranged crosswise. The orthographic projections of the plurality of electrode strips 1211 on the substrate 11 are in a grid shape. The electrode portions 122 are arranged at the intersections of the electrode strips 1211. The electrode mesh 121 and / or the electrode portions 122 are electrically connected to the first potential. In this way, on the one hand, there is no need to set the undercut structure 13 at the edge of the electrode strip 1211, which can reduce the number and difficulty of setting the undercut structure 13. On the other hand, it can also make the first electrode 16 and the auxiliary electrode 12 have better electrical connection performance.

[0144] Furthermore, the plurality of electrode portions 122 are evenly arranged at the intersections of the electrode mesh 121 , which is beneficial to further reduce the resistance of the first electrode 16 , which not only reduces the power consumption of the display panel 10 , but also improves the brightness uniformity.

[0145] Second, refer to Fig.25 As shown, the embodiment of the present application provides a method for preparing a display panel 10, which can be used to prepare the display panel 10 in the first aspect. Specifically, the preparation method includes:

[0146] S100: providing a substrate 11.

[0147] S200: forming an auxiliary electrode 12 on one side of the substrate 11. It should be noted that when the auxiliary electrode 12 and the second electrode 18 are in the same layer, the second electrode 18 can be manufactured simultaneously during the process of manufacturing the auxiliary electrode 12. When the auxiliary electrode 12 and the first electrode line 191 or the second electrode line 192 in the array film layer 19 are in the same layer, the first electrode line 191 or the second electrode line 192 can be manufactured simultaneously during the process of manufacturing the auxiliary electrode 12. Exemplarily, the structure of the auxiliary electrode 12 after manufacturing is as follows: Figure 5 and Figure 6 shown.

[0148] S300: forming an undercut structure 13 on one side of the substrate 11. Figure 7 and Figure 8 As shown, the undercut structure 13 includes a first sub-portion 131 and a second sub-portion 132 stacked in a direction away from the substrate 11. The end of the second sub-portion 132 protrudes from the side of the first sub-portion 131, and the protruding end of the second sub-portion 132 and the side of the first sub-portion 131 form an undercut 13a.

[0149] S400: forming an auxiliary structure 15 on one side of the substrate 11. Fig. 9 and Fig.10 As shown, the auxiliary structure 15 is provided at the undercut 13 a of the partial undercut structure 13 .

[0150] S500: forming a light-emitting functional layer 14 on one side of the substrate 11. Referring to FIG. 1, Figure 2 and Figure 3 As shown, the light-emitting functional layer 14 covers part of the auxiliary electrode 12 and exposes part of the auxiliary electrode 12. The orthographic projection of the protruding end of the second sub-portion 132 on the substrate 11 covers the orthographic projection of the exposed auxiliary electrode 12 on the substrate 11.

[0151] S600: forming a first electrode 16 on a side of the light-emitting functional layer 14 away from the substrate 11. Figure 4 The first electrode 16 is further extended to the exposed auxiliary electrode 12 by means of the auxiliary structure 15 to be electrically connected to the auxiliary electrode 12 .

[0152] In one embodiment, the evaporation angle of the first electrode 16 is greater than the evaporation angle of the light-emitting functional layer 14. Specifically, when the light-emitting functional layer 14 is evaporated, the evaporation angle of the light-emitting functional layer 14 is controlled, such as the evaporation angle of the light-emitting functional layer 14 is Figure 4 As shown by the dotted line a in FIG. 1 , the auxiliary electrode 12 located below the end of the second sub-portion 132 is exposed. When the first electrode 16 is evaporated, the evaporation angle of the first electrode 16 is controlled, such as the evaporation angle of the first electrode 16 is as shown in FIG. Figure 4 As shown by the dotted line b in FIG. 1 , the first electrode 16 covers the exposed auxiliary electrode 12 .

[0153] The method for preparing the display panel 10 provided in the embodiment of the present application, by setting the auxiliary structure 15, can enable the first electrode 16 to extend to the exposed auxiliary electrode 12, thereby achieving electrical connection with the auxiliary electrode 12. Furthermore, the auxiliary structure 15 is conducive to making the thickness of the first electrode 16 uniform and the film layer continuity good, which is conducive to reducing the connection resistance between the first electrode 16 and the auxiliary electrode 12, thereby improving the electrical connection performance between the first electrode 16 and the auxiliary electrode 12.

[0154] In a third aspect, an embodiment of the present application provides a display device, comprising the display panel in any embodiment of the first aspect.

[0155] The display device can be a laptop computer, a mobile phone, a wireless device, a personal digital assistant (PDA), a handheld or portable computer, a GPS receiver / navigator, a camera, an MP4 video player, a camcorder, a game console, a watch, a clock, a calculator, a television monitor, a flat-panel display, a computer monitor, a car display (e.g., an odometer display, etc.), a navigator, a cockpit controller and / or display, a display of a camera view (e.g., a display of a rearview camera in a vehicle), an electronic photo, an electronic billboard or sign, a projector, etc.

[0156] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0157] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0158] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A display panel, characterized in that: include: substrate; An auxiliary electrode, disposed on one side of the substrate; An undercut structure is provided on one side of the substrate; the undercut structure comprises a first sub-section and a second sub-section stacked in a direction away from the substrate; an end of the second sub-section protrudes from a side surface of the first sub-section, and the protruding end of the second sub-section and the side surface of the first sub-section are combined to form an undercut; An auxiliary structure, provided at the undercut of part of the undercut structure; A light-emitting functional layer is provided on one side of the substrate; part of the light-emitting functional layer covers part of the auxiliary electrode and exposes part of the auxiliary electrode; the orthographic projection of the protruding end of the second sub-portion on the substrate covers the orthographic projection of the exposed auxiliary electrode on the substrate; The first electrode is arranged on a side of the light-emitting functional layer away from the substrate, and is extended to the exposed auxiliary electrode by means of the auxiliary structure to be electrically connected to the auxiliary electrode.

2. The display panel according to claim 1, characterized in that: The auxiliary structure has a slope, the slope surface of which intersects with the thickness direction of the substrate, and the first electrode extends to the exposed auxiliary electrode via the slope surface of the slope; Optionally, part of the auxiliary structure fills part of the undercut of the undercut structure; Optionally, the auxiliary structure also covers a portion of the surface of the second sub-portion on a side away from the first sub-portion.

3. The display panel according to claim 1, characterized in that: The display panel further comprises a pixel defining layer, the light-emitting function layer comprises a plurality of light-emitting portions, a plurality of pixel openings are arranged on the pixel defining layer, and the light-emitting portions are arranged corresponding to the pixel openings; The auxiliary structure is arranged in the same layer as the pixel defining layer.

4. The display panel according to claim 1, characterized in that: The undercut structure comprises an insulating material; Optionally, the first sub-section and the second sub-section are both made of insulating materials; Optionally, the first sub-section and the second sub-section are made of the same material, and both the first sub-section and the second sub-section are made of organic materials; Optionally, the first sub-section and the second sub-section are made of different materials; Optionally, the first sub-section and the second sub-section are both inorganic materials; Optionally, one of the first sub-section and the second sub-section is an organic material, and the other is an inorganic material; Optionally, the first sub-section is a conductive material, and the second sub-section is an insulating material; Optionally, the first sub-part is a metal oxide material, and the second sub-part is an inorganic material or an organic material.

5. The display panel according to claim 1, characterized in that: The orthographic projection of the undercut structure on the substrate surrounds at least a portion of the orthographic projection of the auxiliary electrode on the substrate; Optionally, the orthographic projection of the first sub-portion on the substrate overlaps with the orthographic projection of the auxiliary electrode on the substrate; Optionally, the orthographic projection of the first sub-portion on the substrate covers the orthographic projection edge of the auxiliary electrode on the substrate; Optionally, an orthographic projection of the first sub-portion on the substrate is connected to an orthographic projection of the auxiliary electrode on the substrate.

6. The display panel according to claim 1, characterized in that: The display panel also includes a plurality of second electrodes disposed between the substrate and the light-emitting functional layer, and the plurality of second electrodes are arranged at intervals; the second electrodes are insulated from the auxiliary electrodes; the auxiliary electrodes are electrically connected to a first potential, and the second electrodes are electrically connected to a second potential.

7. The display panel according to claim 6, characterized in that: The auxiliary electrode is arranged in the same layer as the second electrode; Optionally, an orthographic projection of the auxiliary electrode on the substrate is spaced apart from an orthographic projection of the second electrode on the substrate.

8. The display panel according to claim 6, characterized in that: The display panel further comprises an array film layer disposed on one side of the substrate; a second electrode line electrically connected to the second potential is disposed in the array film layer, and the second electrode is electrically connected to the second electrode line; Optionally, a first electrode line electrically connected to the first potential is provided in the array film layer, and the auxiliary electrode is electrically connected to the first electrode line; Optionally, the first electrode line and the second electrode line are arranged in the same layer and are insulated from each other; Optionally, the auxiliary electrode and the second electrode line are arranged in the same layer and are insulated from each other.

9. The display panel according to claim 6, characterized in that: The orthographic projection of the auxiliary electrode on the substrate is in a grid shape; Optionally, the auxiliary electrode comprises an electrode mesh, the electrode mesh comprises a plurality of electrode strips arranged crosswise, and the orthographic projections of the plurality of electrode strips on the substrate are in a grid shape; The undercut structure is provided on both sides of at least part of the electrode strips in the width direction; Optionally, an orthographic projection of the electrode mesh on the substrate and an orthographic projection of the second electrode on the substrate are arranged at an interval.

10. The display panel according to claim 6, characterized in that: The auxiliary electrode includes a plurality of electrode portions arranged at intervals, and the display panel includes a plurality of undercut structures arranged corresponding to the plurality of electrode portions; The orthographic projection of the undercut structure on the substrate surrounds at least a portion of the orthographic projection of the corresponding electrode portion on the substrate; Optionally, the display panel further comprises an array film layer provided on one side of the substrate, a first electrode line electrically connected to a first potential is provided in the array film layer, and the plurality of electrode portions are all electrically connected to the first electrode line; Optionally, the orthographic projection of the electrode portion on the substrate is outside the orthographic projection range of the second electrode on the substrate; Optionally, the orthographic projection of the second electrode on the substrate is block-shaped; Optionally, the orthographic projection of the second electrode on the substrate surrounds the orthographic projection of the electrode portion on the substrate; Optionally, the orthographic projection of the second electrode on the substrate is an annular projection, and the annular projection surrounds a partial orthographic projection of the electrode portion on the substrate; Optionally, at least one auxiliary structure is provided at the undercut of each undercut structure; Optionally, a plurality of the auxiliary structures arranged at intervals are provided at the bottom cut of each bottom cut structure.

11. The display panel according to claim 6, characterized in that: The auxiliary electrode includes an electrode network and multiple electrode parts. The electrode network includes multiple electrode strips arranged crosswise, and the orthographic projections of the multiple electrode strips on the substrate are in a grid shape. The electrode parts are arranged at the intersections of the electrode strips; the electrode network and / or the electrode parts are electrically connected to the first potential.

12. A method for preparing a display panel, characterized in that: include: providing a substrate; forming an auxiliary electrode on one side of the substrate; An undercut structure is formed on one side of the substrate; the undercut structure comprises a first sub-section and a second sub-section stacked in a direction away from the substrate; an end of the second sub-section protrudes from a side surface of the first sub-section, and the protruding end of the second sub-section and the side surface of the first sub-section together form an undercut; An auxiliary structure is formed on one side of the substrate; the auxiliary structure is disposed at the bottom cut of a portion of the bottom cut structure; A light-emitting functional layer is formed on one side of the substrate; part of the light-emitting functional layer covers part of the auxiliary electrode, and part of the auxiliary electrode is exposed; the orthographic projection of the protruding end of the second sub-portion on the substrate covers the orthographic projection of the exposed auxiliary electrode on the substrate; A first electrode is formed on a side of the light-emitting functional layer away from the substrate; wherein the first electrode is further extended to the exposed auxiliary electrode by means of the auxiliary structure to be electrically connected to the auxiliary electrode.

13. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-11.

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