Display panel and manufacturing method therefor

Abstract

The present application discloses a display panel and a manufacturing method therefor. The display panel comprises a substrate, a planarization layer, and a light-emitting layer. The planarization layer is located on the substrate. The light-emitting layer is located on the side of the planarization layer away from the substrate, and comprises a plurality of light-emitting structures arranged at intervals and a plurality of auxiliary electrodes. Each light-emitting structure comprises a first electrode located on the planarization layer, a light-emitting material layer located on the side of the first electrode away from the substrate, and a second electrode located on the side of the light-emitting material layer away from the substrate. The plurality of auxiliary electrodes are located on the planarization layer and at least partially in direct contact with the planarization layer, and each auxiliary electrode is used for connecting the second electrodes of two adjacent light-emitting structures. The display panel, the auxiliary electrodes, and the first electrodes are all located on the planarization layer, thereby facilitating the manufacturing of the auxiliary electrodes and facilitating the reduction of the impact on the first electrodes during the manufacturing of the auxiliary electrodes.

Description

Display panel and manufacturing method thereof Technical Field

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

[0002] With the rapid development of technology, OLED display panels have become the preferred display panel for mobile phones, computers, and other devices due to their advantages such as fast response time, high brightness, and wide viewing angle. In OLED display panels, the cathode generally uses a large surface electrode. The connection performance between the cathodes of different sub-pixels directly affects the cathode continuity and the display quality of the display panel.

[0003] Summary of the Invention

[0004] The present application discloses a display panel, comprising:

[0005] substrate;

[0006] a planarization layer located on the substrate;

[0007] A light-emitting layer is located on the side of the planarization layer facing away from the substrate, and the light-emitting layer includes a plurality of light-emitting structures and a plurality of auxiliary electrodes arranged at intervals; the light-emitting structure includes a first electrode located on the planarization layer, a light-emitting material layer located on the side of the first electrode facing away from the substrate, and a second electrode located on the side of the light-emitting material layer facing away from the substrate; a plurality of auxiliary electrodes are located on the planarization layer and at least partially in direct contact with the planarization layer, and the auxiliary electrodes are used to connect the second electrodes of two adjacent light-emitting structures.

[0008] In some embodiments, the auxiliary electrode is provided in the same layer as the first electrode;

[0009] The auxiliary electrode is made of the same material as the first electrode.

[0010] In some embodiments, the planarization layer has two bottom cut grooves partially located below the auxiliary electrode and with openings located on opposite sides of the auxiliary electrode; the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode have their ends respectively located in the two bottom cut grooves and are both connected to the auxiliary electrode.

[0011] In some embodiments, the display panel includes a supporting top layer located on the side of the auxiliary electrode facing away from the substrate, the orthographic projection of the auxiliary electrode in the thickness direction of the display panel is located within the orthographic projection of the supporting top layer in the thickness direction of the display panel, and the auxiliary electrode, the supporting top layer and the planarization layer form two grooves located on opposite sides of the auxiliary electrode; the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode have their ends respectively located in the two grooves and are both connected to the auxiliary electrode.

[0012] In some embodiments, the display panel further comprises a pixel defining layer located on a side of the planarization layer facing away from the substrate; the pixel defining layer is provided with a plurality of pixel openings and a plurality of electrode connection openings, and the electrode connection openings are spaced between two adjacent pixel openings;

[0013] The plurality of pixel openings correspond one-to-one to the plurality of light-emitting structures; the first electrode is at least partially exposed from the pixel opening, and at least a portion of the light-emitting material layer is located within the pixel opening;

[0014] The plurality of electrode connection openings correspond one-to-one to the plurality of auxiliary electrodes; the auxiliary electrodes are located in the electrode connection openings.

[0015] In some embodiments, the display panel further includes an encapsulation layer, which is located on a side of the light-emitting layer facing away from the substrate and includes an inorganic layer covering the light-emitting layer.

[0016] In some embodiments, the light-emitting material layer is a single-layer light-emitting material layer, or a multi-layer light-emitting material layer composed of at least two stacked layers.

[0017] The present application also discloses a method for preparing a display panel, the method comprising:

[0018] providing a substrate;

[0019] forming a planarization layer on the substrate;

[0020] A light-emitting layer is formed on the side of the planarization layer facing away from the substrate; the light-emitting layer includes a plurality of light-emitting structures and a plurality of auxiliary electrodes arranged at intervals; the light-emitting structure includes a first electrode located on the planarization layer, a light-emitting material layer located on the side of the first electrode facing away from the substrate, and a second electrode located on the side of the light-emitting material layer facing away from the substrate; the plurality of auxiliary electrodes are located on the planarization layer and at least partially in direct contact with the planarization layer, and the auxiliary electrodes are used to connect the second electrodes of two adjacent light-emitting structures.

[0021] In some embodiments, forming a light-emitting layer on a side of the planarization layer facing away from the substrate includes:

[0022] forming a first electrode material layer and an auxiliary electrode material layer on a side of the planarization layer facing away from the substrate;

[0023] Etching the first electrode material layer and the auxiliary electrode material layer to form the first electrode and the auxiliary electrode;

[0024] A light-emitting material layer and a second electrode are formed on a side of the first electrode facing away from the substrate.

[0025] In some embodiments, the auxiliary electrode is formed simultaneously with the first electrode;

[0026] The auxiliary electrode is made of the same material as the first electrode.

[0027] In some embodiments, after forming the first electrode and the auxiliary electrode, the method includes:

[0028] forming two undercut grooves corresponding to each auxiliary electrode in the planarization layer, wherein the two undercut grooves corresponding to each auxiliary electrode are partially located below the auxiliary electrode, and openings of the two undercut grooves are respectively located on opposite sides of the auxiliary electrode;

[0029] After the light-emitting layer is formed, the ends of the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode are respectively located in the two undercut grooves and are both connected to the auxiliary electrode.

[0030] In some embodiments, after forming the auxiliary electrode, the method includes:

[0031] A supporting top layer is formed on a side of the auxiliary electrode facing away from the substrate; the orthographic projection of the auxiliary electrode in the thickness direction of the display panel is located within the orthographic projection of the supporting top layer in the thickness direction of the display panel, and the auxiliary electrode, the supporting top layer, and the planarization layer form two grooves located on opposite sides of the auxiliary electrode;

[0032] After the light-emitting layer is formed, the ends of the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode are respectively located in the two grooves and are both connected to the auxiliary electrode.

[0033] In some embodiments, after forming the auxiliary electrode, the method includes:

[0034] forming a top material layer on a side of the planarization layer, the first electrode, and the auxiliary electrode facing away from the substrate;

[0035] Etching the top material layer in the area outside the auxiliary electrode to form a supporting top layer;

[0036] The two opposite sides of the etched auxiliary electrode are etched so that the orthographic projection of the auxiliary electrode in the thickness direction of the display panel is located within the orthographic projection of the supporting top layer in the thickness direction of the display panel, and the auxiliary electrode, the supporting top layer and the planarization layer form two grooves located on the opposite sides of the auxiliary electrode.

[0037] In some embodiments, after forming the first electrode and the auxiliary electrode, the method includes:

[0038] A pixel defining layer is formed on the planarization layer and on the side of the first electrode and the auxiliary electrode facing away from the substrate; the pixel defining layer is provided with a plurality of pixel openings and a plurality of electrode connection openings, and the electrode connection openings are spaced between two adjacent pixel openings; wherein the plurality of pixel openings correspond one-to-one to the plurality of light-emitting structures; the first electrode is at least partially exposed from the pixel opening, and at least a portion of the light-emitting material layer is located within the pixel opening; the plurality of electrode connection openings correspond one-to-one to the plurality of auxiliary electrodes; and the auxiliary electrode is located within the electrode connection opening.

[0039] In some embodiments, after forming the first electrode and the auxiliary electrode, the method includes:

[0040] A pixel defining layer is formed on the planarization layer and on a side of the first electrode and the auxiliary electrode facing away from the substrate; the pixel defining layer is provided with a plurality of pixel openings and a plurality of electrode connection openings, and the electrode connection openings are arranged between two adjacent pixel openings; wherein the plurality of pixel openings correspond one-to-one to the plurality of light-emitting structures; the first electrode is at least partially exposed from the pixel openings; the plurality of electrode connection openings correspond one-to-one to the plurality of auxiliary electrodes; the auxiliary electrodes are located within the electrode connection openings and exposed from the electrode connection openings;

[0041] forming two undercut grooves corresponding to each auxiliary electrode in the planarization layer, wherein the two undercut grooves corresponding to each auxiliary electrode are partially located below the auxiliary electrode, and openings of the two undercut grooves are respectively located on opposite sides of the auxiliary electrode;

[0042] After the light-emitting layer is formed, the ends of the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode are respectively located in the two undercut grooves and are both connected to the auxiliary electrode.

[0043] In some embodiments, at least a portion of the plurality of light-emitting structures are first light-emitting structures having a first light-emitting color, and at least a portion are second light-emitting structures having a second light-emitting color; and forming a light-emitting material layer and a second electrode on a side of the first electrode facing away from the substrate includes:

[0044] forming a light-emitting material layer of a first light-emitting structure on a side of the first electrode facing away from the substrate;

[0045] forming a second electrode of the first light-emitting structure on a side of the light-emitting material layer of the first light-emitting structure facing away from the substrate;

[0046] removing the light-emitting material of the first light-emitting structure and the second electrode of the first light-emitting structure in the region for forming the second light-emitting structure;

[0047] forming a light-emitting material layer of the second light-emitting structure in a region for forming the second light-emitting structure and located on a side of the first electrode facing away from the substrate;

[0048] In the region for forming the light emitting structure, a second electrode of the second light emitting structure is formed on a side of the light emitting material layer of the second light emitting structure facing away from the substrate.

[0049] In some embodiments, after forming the second electrode of the first light emitting structure, the method includes:

[0050] forming a first inorganic layer on a side of the second electrode of the first light emitting structure facing away from the substrate;

[0051] Before forming the light-emitting material layer of the second light-emitting structure located on the side of the first electrode facing away from the substrate in the region for forming the second light-emitting structure, the method further comprises: removing the first inorganic layer;

[0052] After forming the second electrode of the second light emitting structure, the method further includes forming a second inorganic layer on a side of the second electrode of the second light emitting structure facing away from the substrate, wherein the second inorganic layer is connected to the first inorganic layer.

[0053] In some embodiments, the light-emitting structures have the same light-emitting color, and forming a light-emitting material layer and a second electrode on a side of the first electrode facing away from the substrate includes:

[0054] A light emitting material layer and a second electrode are formed in sequence on a side of the first electrode facing away from the substrate.

[0055] In some embodiments, after forming a light-emitting layer on a side of the planarization layer facing away from the substrate, the method includes:

[0056] An encapsulation layer is formed on a side of the light-emitting layer facing away from the substrate, and the encapsulation layer includes an inorganic layer covering the light-emitting layer.

[0057] Compared with related technologies, in the display panel and preparation method thereof of the present application, the auxiliary electrode and the first electrode are both located on the planarization layer, which facilitates the preparation of the auxiliary electrode and helps to reduce the impact on the first electrode while preparing the auxiliary electrode.

[0058] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0060] FIG1 is a partial cross-sectional view of a display panel provided in an embodiment of the present application;

[0061] FIG2 is a partial cross-sectional view of another display panel provided in an embodiment of the present application;

[0062] FIG3 is a flow chart of a method for manufacturing a display panel provided in an embodiment of the present application;

[0063] 4 to 14 are partial process diagrams of manufacturing a display panel according to an embodiment of the present application;

[0064] 15 to 17 are partial manufacturing process diagrams of another display panel provided in an embodiment of the present application;

[0065] 18 to 20 are schematic diagrams of layer structures of different light-emitting structures. DETAILED DESCRIPTION

[0066] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with this specification. Rather, they are merely examples of apparatus and methods consistent with certain aspects of this specification, as detailed in the appended claims.

[0067] The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the present disclosure. Unless otherwise defined, technical or scientific terms used in this specification should have the same ordinary meaning as those having ordinary skill in the art to which this application belongs. The terms "first," "second," and similar terms used in this specification and claims do not denote any order, quantity, or importance, but are simply used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a limitation of quantity, but rather indicate the presence of one. "Multiple" or "several" means two or more. Unless otherwise indicated, terms such as "front," "rear," "lower," and / or "upper" are used for convenience only and are not intended to limit the scope of the present disclosure to a specific location or spatial orientation. Terms such as "include" or "comprising" mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect.

[0068] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. As used in this specification and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0069] The present application provides a display panel and a method for manufacturing the same. The display panel includes a substrate, a planarization layer, and a light-emitting layer. The planarization layer is located on the substrate. The light-emitting layer is located on the side of the planarization layer facing away from the substrate. The light-emitting layer includes multiple spaced light-emitting structures and multiple auxiliary electrodes. The light-emitting structures include a first electrode located on the planarization layer, a light-emitting material layer located on the side of the first electrode facing away from the substrate, and a second electrode located on the side of the light-emitting material layer facing away from the substrate. The multiple auxiliary electrodes are located on the planarization layer and at least partially in direct contact with the planarization layer. The auxiliary electrodes are used to connect the second electrodes of two adjacent light-emitting structures. In the above display panel, both the auxiliary electrodes and the first electrodes are located on the planarization layer, which facilitates the preparation of the auxiliary electrodes and helps minimize the impact on the first electrodes during the preparation of the auxiliary electrodes. The direct contact between the auxiliary electrodes and the planarization layer prevents the adverse effects of etching the metal layer on the pixel defining layer and the first electrodes, as compared to the electrode structure formed by depositing a metal layer on the pixel defining layer and then etching it in the related art.

[0070] The display panel mentioned in this application may be an OLED display panel.

[0071] Some embodiments of the display panel and the manufacturing method thereof provided by the present application are described in detail below with reference to Figures 1 to 20.

[0072] First, referring to FIG1 and, if necessary, in conjunction with FIG2 and FIG18 to FIG20 , an embodiment of the present application provides a display panel 100 . The display panel 100 includes a substrate 10 , a planarization layer 58 , and a light emitting layer 20 .

[0073] A planarization layer 58 is located on the substrate 10 .

[0074] The light-emitting layer 20 is located on the side of the planarization layer 58 away from the substrate 10, and the light-emitting layer 20 includes a plurality of light-emitting structures 201 and a plurality of auxiliary electrodes 202 arranged at intervals; the light-emitting structure 201 includes a first electrode 21 located on the planarization layer 58, a light-emitting material layer 22 located on the side of the first electrode 21 away from the substrate 10, and a second electrode 23 located on the side of the light-emitting material layer 22 away from the substrate 10; the plurality of auxiliary electrodes 202 are located on the planarization layer 58 and are at least partially in direct contact with the planarization layer 58, and the auxiliary electrodes 202 are used to connect the second electrodes 23 of two adjacent light-emitting structures 201.

[0075] Here, the first electrode 21 may be an anode, and the second electrode 23 may be a cathode. The first electrode 21 may be formed of three stacked metal layers of ITO, silver, and ITO. The second electrode 23 may be formed of two stacked metal layers of magnesium and silver.

[0076] The planarization layer 58 mentioned here may be an organic material layer.

[0077] In some embodiments, the auxiliary electrode 202 is disposed in the same layer as the first electrode 21. This co-layer arrangement can be understood as simultaneous formation through the same manufacturing process. For example, a first electrode material layer can be disposed on the planarization layer 58, and the first electrode 21 and the auxiliary electrode 202 can be simultaneously formed by etching. Co-layering the auxiliary electrode 202 and the first electrode 21 facilitates simplifying the manufacturing processes of the auxiliary and first electrodes, thereby simplifying the manufacturing process of the display panel.

[0078] Of course, the first electrode and the auxiliary electrode may also be formed asynchronously, for example, by etching the first electrode material layer separately, or by etching different electrode material layers separately or simultaneously.

[0079] In some embodiments, the auxiliary electrode 202 is made of the same material as the first electrode 21 , so that the two can be formed simultaneously.

[0080] It can be understood that in some other embodiments, the two materials may also be different.

[0081] In some embodiments, the planarization layer 58 has two undercut grooves 502 and 503 partially located below the auxiliary electrode 202 and with openings located on opposite sides of the auxiliary electrode 202. The second electrodes 23 of two adjacent light-emitting structures 201 connected to the auxiliary electrode 202 have their ends located in the two undercut grooves 502 and 503, respectively, and are both connected to the auxiliary electrode 202.

[0082] For example, as shown in FIG1 , the planarization layer 58 has two undercut grooves 502 and 503 partially located below the auxiliary electrode 202 and openings located on opposite sides of the auxiliary electrode 202 in the width direction W. The auxiliary electrode 202 connects the second electrodes 231 and 232 of two adjacent light-emitting structures 2011 and 2012. One end of the second electrode 231 of the light-emitting structure 2011 is located in the undercut groove 502, and one end of the second electrode 232 of the light-emitting structure 2012 is located in the undercut groove 503.

[0083] 2 , in some other embodiments, the display panel 200 includes a supporting top layer 60 located on a side of the auxiliary electrode 202 facing away from the substrate 10. The orthographic projection of the auxiliary electrode 202 in the thickness direction T of the display panel 200 is located within the orthographic projection of the supporting top layer 60 in the thickness direction T of the display panel 200. The auxiliary electrode 202, the supporting top layer 60, and the planarization layer 58 form two grooves 601 and 602 located on opposite sides of the auxiliary electrode 202. The second electrodes 233 and 234 of the two adjacent light-emitting structures 2013 and 2014 connected to the auxiliary electrode 202 have their ends located in the two grooves 601 and 602, respectively, and are both connected to the auxiliary electrode 202.

[0084] Specifically, as shown in FIG2 , the auxiliary electrode 202 may have a dimension in the width direction W that is smaller than the dimension of the supporting top layer 60 in the width direction W. Opposite ends of the auxiliary electrode 202 in the width direction W, together with the supporting top layer 60 and the planarization layer 58, form two grooves 601 and 602 located on opposite sides of the auxiliary electrode 202 in the width direction W. One end of the second electrode 233 of the light-emitting structure 2013 is located in the groove 601, and one end of the second electrode 234 of the light-emitting structure 2014 is located in the groove 602.

[0085] In some embodiments, the material of the supporting top layer 60 is an inorganic material.

[0086] Of course, in other embodiments, the supporting top layer may be made of other materials.

[0087] In some embodiments, the display panel 100 further includes a pixel defining layer 40 located on the side of the planarization layer 58 facing away from the substrate 10 ; the pixel defining layer 40 is provided with a plurality of pixel openings 401 and a plurality of electrode connection openings 402 , and the electrode connection openings 402 are spaced apart between two adjacent pixel openings 401 .

[0088] The plurality of pixel openings 401 correspond one-to-one to the plurality of light emitting structures 201 . The first electrode 21 is at least partially exposed from the pixel opening 401 , and at least a portion of the light emitting material layer 22 is located within the pixel opening 401 .

[0089] The plurality of electrode connection openings 402 correspond one-to-one to the plurality of auxiliary electrodes 202 . The auxiliary electrodes 202 are located in the electrode connection openings 402 .

[0090] In some embodiments, the display panel 100 further includes an encapsulation layer 30 . The encapsulation layer 30 is located on a side of the light-emitting layer 20 facing away from the substrate 10 and includes an inorganic layer 31 covering the light-emitting layer 20 .

[0091] As shown in FIG. 1 , the encapsulation layer 30 may further include an organic layer 32 located on a side of the inorganic layer 31 facing away from the substrate 10 , and another inorganic layer 33 located on a side of the organic layer 32 facing away from the substrate.

[0092] As shown in FIG1 , the display panel 100 may include a pixel driver circuit layer 50 between a substrate 10 and a light-emitting layer 20. The pixel driver circuit layer 50 includes a pixel driver circuit for driving the light-emitting structure 201. The pixel circuit includes a thin film transistor 501. The thin film transistor 501 includes an active layer 51, a gate electrode 52 located on a side of the active layer 51 facing away from the substrate 10, a first electrode 53, and a second electrode 54. One of the first electrode 53 and the second electrode 54 is a source electrode, and the other is a drain electrode. The pixel driver circuit may also include a capacitor (not shown).

[0093] The pixel driving circuit layer further includes a gate insulating layer 55, an interlayer dielectric layer 56, an interlayer dielectric layer 57, and a planarization layer 58. The gate insulating layer 55 is located between the active layer 51 and the gate electrode 52. The interlayer dielectric layer 56 is located on the side of the gate electrode 52 facing away from the substrate 10. The first electrode 53 and the second electrode 54 are electrically connected to the active layer 51 via vias penetrating the gate insulating layer 55, the interlayer dielectric layer 56, and the interlayer dielectric layer 57. The planarization layer 58 is located on the side of the first electrode 53 and the second electrode 54 facing away from the substrate 10, covering the exposed interlayer dielectric layer 57.

[0094] It is understood that the planarization layer 58 here may be the top layer of the pixel driving circuit layer 50. Of course, in some other embodiments, the planarization layer may also be another planarization layer of the pixel driving circuit layer 50 away from the substrate 10.

[0095] 18 to 20 , the light-emitting material layer 22 referred to in this application may be a single-layer light-emitting material layer. For example, as shown in FIG18 , the light-emitting structure 201 may include an anode layer AE1 (corresponding to the first electrode 21 ), a hole transport layer HTL1 , a light-emitting material layer EML1 , an electron transport layer ETL1 , and a cathode layer CE (corresponding to the second electrode 23 ).

[0096] Of course, the light-emitting material layer 22 may also be a multi-layer light-emitting material layer composed of at least two stacked layers.

[0097] For example, two stacked light-emitting material layers are shown in Figure 19. As shown in Figure 19, the layer structure of the light-emitting structure 201 may include an anode layer AE1 (corresponding to the first electrode 21), a hole transport layer HTL1, a light-emitting material layer EML11, a bonding layer CGL1, a light-emitting material layer EML12, an electron transport layer ETL1 and a cathode layer CE (corresponding to the second electrode 23).

[0098] For another example, a three-layer stacked light-emitting material layer is shown in Figure 20. As shown in Figure 20, the layer structure of the light-emitting structure 201 may include an anode layer AE1 (corresponding to the first electrode 21), a hole transport layer HTL1, a light-emitting material layer EML11, a bonding layer CGL11, a light-emitting material layer EML12, a bonding layer CGL12, a light-emitting material layer EML13, an electron transport layer ETL1, and a cathode layer CE (corresponding to the second electrode 23).

[0099] Referring to FIG. 3 and, if necessary, in combination with FIG. 4 to FIG. 20 , the present application further provides a method for manufacturing a display panel, the method comprising the following steps S101 to S105:

[0100] In step S101 , a substrate 10 is provided.

[0101] In step S103 , a planarization layer 58 is formed on the substrate 10 .

[0102] In step S105, a light-emitting layer 20 is formed on the side of the planarization layer 58 away from the substrate 10; the light-emitting layer 20 includes a plurality of light-emitting structures 201 and a plurality of auxiliary electrodes 202 arranged at intervals; the light-emitting structure 201 includes a first electrode 21 located on the planarization layer 58, a light-emitting material layer 22 located on the side of the first electrode 21 away from the substrate 10, and a second electrode 23 located on the side of the light-emitting material layer 22 away from the substrate 10; the plurality of auxiliary electrodes 202 are located on the planarization layer 58 and are at least partially in direct contact with the planarization layer 58, and the auxiliary electrodes 202 are used to connect the second electrodes 23 of two adjacent light-emitting structures 201.

[0103] As shown in FIG. 4 , in step S101 , a substrate 10 is provided.

[0104] The substrate 10 may be a silicon-based substrate.

[0105] As shown in FIG. 5 , in step S103 , a planarization layer 58 is formed on the substrate 10 .

[0106] After step S103, an intermediate structure 1001 as shown in FIG5 can be formed. The intermediate structure 1001 can include a driving circuit layer 50. The planarization layer 58 can be the top layer of the driving circuit layer 50. Specifically, in some embodiments, the driving circuit layer 50 can be formed on a provided substrate 10. The top layer of the driving circuit layer 50 is the formed planarization layer 58.

[0107] Of course, in some other embodiments, the planarization layer may also be an independent film layer located on the side of the driving circuit layer facing away from the substrate. Accordingly, the step of forming the planarization layer may be performed after forming the driving circuit layer.

[0108] In some embodiments, step S105 may include the following steps S1051 to S1053:

[0109] As shown in FIG. 6 , in step S1051 , a first electrode material layer and an auxiliary electrode material layer are formed on a side of the planarization layer 58 facing away from the substrate 10 .

[0110] After step S1051 , an intermediate structure 1002 as shown in FIG6 can be formed. In the intermediate structure 1002 , the auxiliary electrode material layer and the first electrode material layer can be the same material layer, for example, both are the first electrode material layer 210 .

[0111] Of course, in some other embodiments, the two may also be different material layers.

[0112] It is understood that before forming the first electrode material layer 210, a through hole connected to the thin film transistor in the driving circuit layer can be provided in the planarization layer 58. When forming the first electrode material layer 210, a conductive structure can be formed in the through hole.

[0113] As shown in FIG. 7 , in step S1052 , the first electrode material layer and the auxiliary electrode material layer are etched to form the first electrode 21 and the auxiliary electrode 202 .

[0114] After step S1052 , the intermediate structure 1003 as shown in FIG. 7 may be formed.

[0115] If the first electrode material layer and the auxiliary electrode material layer are both the first electrode material layer 210 , the first electrode 21 and the auxiliary electrode 202 can be formed by photolithography on the first electrode material layer 210 using the same mask.

[0116] As shown in FIG. 8 to FIG. 14 , in step S1053 , a light-emitting material layer 22 and a second electrode 23 are formed on a side of the first electrode 21 facing away from the substrate 10 .

[0117] As shown in FIG6 and FIG7 , in some embodiments, the auxiliary electrode 202 is formed simultaneously with the first electrode 21 ;

[0118] The auxiliary electrode 202 is made of the same material as the first electrode 21 .

[0119] As shown in FIG8 , after forming the first electrode and the auxiliary electrode in step S1052 , the method includes step S10531 :

[0120] In step S10531, two undercut grooves corresponding to each auxiliary electrode 202 are formed in the planarization layer 58. The two undercut grooves corresponding to each auxiliary electrode 202 have a portion located below the auxiliary electrode 202, and the openings of the two undercut grooves are respectively located on opposite sides of the auxiliary electrode 202.

[0121] After step S10531 , an intermediate structure 1004 as shown in FIG8 is formed. In the intermediate structure 1004 , the planarization layer 58 has two undercut grooves 502 and 503 partially located below the auxiliary electrode 202 and openings located on opposite sides of the auxiliary electrode 202 in the width direction W.

[0122] Accordingly, after forming the light-emitting material layer and the second electrode (i.e., forming the entire light-emitting layer), the ends of the second electrodes 23 of the two adjacent light-emitting structures 201 connected to the auxiliary electrode 202 are respectively located in the two bottom cut grooves and are both connected to the auxiliary electrode 202.

[0123] As shown in FIG9 , after forming the first electrode and the auxiliary electrode in step S1052, specifically after step S10531, the method further includes step S10532:

[0124] In step S10532, a pixel defining layer 40 is formed on the side of the planarization layer 58, the first electrode 21, and the auxiliary electrode 202 facing away from the substrate 10. The pixel defining layer 40 is provided with a plurality of pixel openings 401 and a plurality of electrode connection openings 402, with the electrode connection openings 402 being spaced apart between two adjacent pixel openings 401. The plurality of pixel openings 401 correspond one-to-one to the plurality of light-emitting structures 201. The first electrode 21 is at least partially exposed from the pixel openings 401, and at least a portion of the light-emitting material layer 22 is located within the pixel openings 401. The plurality of electrode connection openings 402 correspond one-to-one to the plurality of auxiliary electrodes 202, and the auxiliary electrodes 202 are located within the electrode connection openings 402. Specifically, the intermediate structure 1005 shown in FIG. 9 may be shown.

[0125] In some embodiments, at least a portion of the plurality of light-emitting structures 201 are first light-emitting structures having a first light-emitting color, such as the light-emitting structure 2011 shown in FIG1 , and at least a portion are second light-emitting structures having a second light-emitting color, such as the light-emitting structure 2012 shown in FIG1 . At least a portion of the first light-emitting structures and the second light-emitting structures are disposed adjacent to each other.

[0126] After step S10532, the method includes the following steps S10533 to S10537:

[0127] As shown in FIG. 10 , in step S10533 , a light-emitting material layer 22 of a first light-emitting structure is formed on a side of the first electrode 21 facing away from the substrate 10 .

[0128] In step S10534 , a second electrode 23 of the first light-emitting structure is formed on a side of the light-emitting material layer 22 of the first light-emitting structure facing away from the substrate 10 .

[0129] After step S10533 and step S10534 , the intermediate structure 1006 shown in FIG. 10 may be formed.

[0130] In the intermediate structure 1006, the light-emitting material layer 22 and the second electrode 23 of the first light-emitting structure can be formed by forming the material layers corresponding to the light-emitting material layer and the second electrode within the entire area of ​​the display panel, and the light-emitting material layer and the second electrode located in the entire area are formed by etching respectively.

[0131] As shown in FIG. 11 and FIG. 12 , in step S10535 , the light-emitting material of the first light-emitting structure and the second electrode 23 of the first light-emitting structure in the region for forming the second light-emitting structure are removed.

[0132] As shown in Figure 11, when removing the light-emitting material of the first light-emitting structure and the first electrode of the first light-emitting structure in the area used to form the second light-emitting structure, PR glue or other protective layers can be applied above the area where the first light-emitting structure is located to protect the various structures within the area of ​​the first light-emitting structure, such as the intermediate structure 1007 shown in Figure 11.

[0133] It can be understood that, as shown in Figure 12, when removing the light-emitting material of the first light-emitting structure and the second electrode 23 of the first light-emitting structure in the area for forming the second light-emitting structure, the light-emitting material of the first light-emitting structure and the second electrode of the first light-emitting structure located in the bottom cut groove 502 below the auxiliary electrode 202 connecting the adjacent first light-emitting structure and the second light-emitting structure can be removed at the same time.

[0134] After step S10535, an intermediate structure 1008 as shown in FIG12 is formed. In the intermediate structure 1008, the light emitting material layer and the second electrode in the region for forming the second light emitting structure are removed, and the light emitting material layer and the second electrode in the undercut groove 502 below the auxiliary electrode 202 are also removed.

[0135] As shown in FIG13 , in step S10536 , in the region for forming the second light emitting structure 201 , a light emitting material layer 22 of the second light emitting structure 201 is formed on the side of the first electrode 21 facing away from the substrate 10 ;

[0136] In step S10537 , in the region for forming the light emitting structure 201 , a second electrode 23 of the second light emitting structure 201 is formed on a side of the light emitting material layer 22 of the second light emitting structure 201 facing away from the substrate 10 .

[0137] After steps S10536 and S10537, an intermediate structure 1009 as shown in FIG13 can be formed. In this intermediate structure, the second electrodes of the first light-emitting structure and the second light-emitting structure located on opposite sides of the auxiliary electrode 202 in the width direction W are connected via the auxiliary electrode 202. Furthermore, the first light-emitting structure and the second light-emitting structure have different light-emitting material layers.

[0138] Step S10536 and step S10537 are similar to the above-mentioned steps S10533 and S10534.

[0139] It is understood that a portion of the plurality of light-emitting structures may also be third light-emitting structures having a third luminescent color. Accordingly, in step S10535, the light-emitting material of the first light-emitting structure and the second electrode 23 of the first light-emitting structure in the region for forming the third light-emitting structure may be removed accordingly. In steps S10536 and S10537, the second light-emitting structure is formed in the region for forming the third light-emitting structure. Accordingly, similar steps from step S10535 to step S10537 may be repeated to form the third light-emitting structure in the region for forming the third light-emitting structure.

[0140] Here, the first luminous color, the second luminous color, and the third luminous color can be one of red, green, and blue respectively.

[0141] Of course, each light emitting structure of the display panel may also have only two types of light emitting structures, one emitting a first light emitting color and the other emitting a second light emitting color. Accordingly, the first light emitting color and the second light emitting color may be any two of red, blue, and green.

[0142] In addition, in some other embodiments, each light emitting structure may also have the same light emitting color. Accordingly, after step S1052, especially after step S10532, the method includes the following step S1530:

[0143] In step S1530 , a light-emitting material layer and a second electrode are sequentially formed on a side of the first electrode facing away from the substrate.

[0144] This step S1530 may be similar to step S10533 and step S10534. In this embodiment, after the light emitting material layer and the second electrode are formed, subsequent film layers or structures may be directly disposed.

[0145] In some embodiments, after forming the second electrode 23 of the first light emitting structure 201 in step S1052, specifically after step S10534, the method includes the following step S10538:

[0146] In step S10538 , a first inorganic layer, such as the inorganic layer 311 shown in FIG. 10 , is formed on the side of the second electrode 23 of the first light emitting structure 201 facing away from the substrate 10 .

[0147] Accordingly, in the region for forming the second light-emitting structure 201, before forming the light-emitting material layer 22 of the second light-emitting structure 201 located on the side of the first electrode 21 facing away from the substrate 10, the method further includes: removing the first inorganic layer 311, as shown in FIG12 . This step of removing the first inorganic layer 311 can be performed simultaneously with step S10535 or before step S10535.

[0148] Accordingly, after forming the second electrode 23 of the second light emitting structure 201, the method further includes the following step S10539:

[0149] In step S10539 , a second inorganic layer 312 is formed on the side of the second electrode 23 of the second light emitting structure 201 away from the substrate 10 . The second inorganic layer 312 is connected to the first inorganic layer 311 to form a continuous inorganic layer 31 , as shown in FIG. 13 .

[0150] For each light-emitting structure, all light-emitting colors may be the same. After forming the light-emitting material layer and the second electrode, an encapsulation layer 30 may be formed directly on the side of the light-emitting layer 20 away from the substrate 10 . The encapsulation layer 30 includes an inorganic layer covering the light-emitting layer 20 .

[0151] It should be noted that, in other embodiments, the order of steps S10531 and S10532 may be interchanged, that is, after step S1052 , the pixel defining layer is formed first, and then the undercut grooves 502 and 503 are formed.

[0152] Here, the formation of undercut grooves 502 and 503 is taken as an example for description. In some embodiments, after forming the first electrode and the auxiliary electrode in step S1052, the method includes:

[0153] Step S10531′: forming a pixel defining layer on the planarization layer and on a side of the first electrode and the auxiliary electrode facing away from the substrate; the pixel defining layer is provided with a plurality of pixel openings and a plurality of electrode connection openings, wherein the electrode connection openings are spaced between two adjacent pixel openings; wherein the plurality of pixel openings correspond one-to-one to the plurality of light-emitting structures; the first electrode is at least partially exposed from the pixel openings; the plurality of electrode connection openings correspond one-to-one to the plurality of auxiliary electrodes; the auxiliary electrodes are located within the electrode connection openings and exposed from the electrode connection openings;

[0154] Step S10532′: forming two undercut grooves corresponding to each auxiliary electrode in the planarization layer, wherein the two undercut grooves corresponding to each auxiliary electrode are partially located below the auxiliary electrode, and the openings of the two undercut grooves are located on opposite sides of the auxiliary electrode;

[0155] After the light-emitting layer is formed, the ends of the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode are respectively located in the two undercut grooves and are both connected to the auxiliary electrode.

[0156] It can be understood that, in this embodiment, after step S10532', step S10533 and other subsequent steps may be entered, and the details may still refer to the corresponding steps described above.

[0157] It is understandable that in some other embodiments, the undercut groove may not be provided in the planarization layer 58 , and a groove may be formed on the side of the planarization layer 58 facing away from the substrate 10 .

[0158] 15 to 17 , in some other embodiments, after forming the auxiliary electrode 202 in step S1052 , the method may include the following step S1054 :

[0159] In step S1054, a supporting top layer 60 is formed on the side of the auxiliary electrode 202 facing away from the substrate 10; the orthographic projection of the auxiliary electrode 202 in the thickness direction T of the display panel is located within the orthographic projection of the supporting top layer 60 in the thickness direction T of the display panel, and the auxiliary electrode 202, the supporting top layer 60 and the planarization layer 58 form two grooves 601 and 602 located on opposite sides of the auxiliary electrode 202.

[0160] Correspondingly, after the entire light-emitting layer 20 is formed, the ends of the second electrodes 23 of the two adjacent light-emitting structures 201 connected to the auxiliary electrode 202 are respectively located in the two grooves and are both connected to the auxiliary electrode 202 .

[0161] 15 to 17 , after forming the auxiliary electrode 202 in step S1052 , step S1054 may specifically include steps S10541 to S10543 :

[0162] As shown in FIG. 15 , in step S10541 , a top material layer 600 is formed on the side of the planarization layer 58 , the first electrode 21 and the auxiliary electrode 202 facing away from the substrate 10 , forming an intermediate structure 2001 as shown in FIG. 15 .

[0163] As shown in FIG. 16 , in step S10542 , the top material layer located outside the auxiliary electrode 202 is etched to form a supporting top layer 60 , thereby forming an intermediate structure 2002 as shown in FIG. 16 .

[0164] As shown in Figure 17, in step S10543, the two opposite sides of the etched auxiliary electrode 202 are etched so that the orthographic projection of the auxiliary electrode 202 in the thickness direction T of the display panel is located within the orthographic projection of the supporting top layer 60 in the thickness direction T of the display panel, and the auxiliary electrode 202, the supporting top layer 60 and the planarization layer 58 form two grooves 601 and 602 located on the opposite sides of the auxiliary electrode 202, forming an intermediate structure 2003 as shown in Figure 17.

[0165] The subsequent steps of setting the light-emitting material layer, the second electrode, and the packaging layer in this embodiment are similar to the above-mentioned implementation of setting the bottom cut grooves 502 and 503. Please refer to the above-mentioned related descriptions and will not be repeated here.

[0166] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the present invention and practice of the invention claimed herein. This specification is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this specification and include common knowledge or customary techniques in the art not claimed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present invention being indicated by the following claims.

[0167] It should be understood that the present description is not limited to the exact structure that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.

[0168] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A display panel, characterized in that: include: substrate; a planarization layer, located on the substrate; A light-emitting layer, located on a side of the planarization layer away from the substrate, the light-emitting layer comprising a plurality of light-emitting structures arranged at intervals and a plurality of auxiliary electrodes; The light emitting structure comprises a first electrode located on the planarization layer, a light emitting material layer located on a side of the first electrode facing away from the substrate, and a second electrode located on a side of the light emitting material layer facing away from the substrate; The plurality of auxiliary electrodes are located on the planarization layer and at least partially in direct contact with the planarization layer. The auxiliary electrodes are used to connect the second electrodes of two adjacent light emitting structures.

2. The display panel according to claim 1, wherein: The auxiliary electrode is arranged in the same layer as the first electrode; The auxiliary electrode is made of the same material as the first electrode.

3. The display panel according to claim 1, wherein: The planarization layer has two bottom cut grooves partially located below the auxiliary electrode and openings located on opposite sides of the auxiliary electrode; the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode have their ends respectively located in the two bottom cut grooves and are both connected to the auxiliary electrode.

4. The display panel according to claim 1, wherein: The display panel includes a supporting top layer located on the side of the auxiliary electrode facing away from the substrate, the orthographic projection of the auxiliary electrode in the thickness direction of the display panel is located within the orthographic projection of the supporting top layer in the thickness direction of the display panel, and the auxiliary electrode, the supporting top layer and the planarization layer form two grooves located on opposite sides of the auxiliary electrode; the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode have their ends respectively located in the two grooves and are both connected to the auxiliary electrode.

5. The display panel according to claim 1, wherein: The display panel further comprises a pixel defining layer located on a side of the planarization layer away from the substrate; the pixel defining layer is provided with a plurality of pixel openings and a plurality of electrode connection openings, and the electrode connection openings are arranged between two adjacent pixel openings at intervals; The plurality of pixel openings correspond one-to-one to the plurality of light-emitting structures; The first electrode is at least partially exposed from the pixel opening, and at least a portion of the light-emitting material layer is located in the pixel opening; The plurality of electrode connection openings correspond one-to-one to the plurality of auxiliary electrodes; The auxiliary electrode is located in the electrode connecting opening.

6. The display panel according to any one of claims 1 to 5, characterized in that: The display panel further includes an encapsulation layer, which is located on a side of the light-emitting layer away from the substrate and includes an inorganic layer covering the light-emitting layer.

7. The display panel according to any one of claims 1 to 5, characterized in that: The light-emitting material layer is a single-layer light-emitting material layer, or a multi-layer light-emitting material layer composed of at least two stacked layers.

8. A method for preparing a display panel, characterized in that: The method comprises: providing a substrate; forming a planarization layer on the substrate; A light-emitting layer is formed on the side of the planarization layer facing away from the substrate; the light-emitting layer includes a plurality of light-emitting structures and a plurality of auxiliary electrodes arranged at intervals; the light-emitting structure includes a first electrode located on the planarization layer, a light-emitting material layer located on the side of the first electrode facing away from the substrate, and a second electrode located on the side of the light-emitting material layer facing away from the substrate; the plurality of auxiliary electrodes are located on the planarization layer and at least partially in direct contact with the planarization layer, and the auxiliary electrodes are used to connect the second electrodes of two adjacent light-emitting structures.

9. The method for preparing a display panel according to claim 1, wherein: The forming of a light emitting layer on a side of the planarization layer away from the substrate comprises: forming a first electrode material layer and an auxiliary electrode material layer on a side of the planarization layer facing away from the substrate; Etching the first electrode material layer and the auxiliary electrode material layer to form the first electrode and the auxiliary electrode; A light emitting material layer and a second electrode are formed on a side of the first electrode facing away from the substrate.

10. The method for manufacturing a display panel according to claim 9, wherein: The auxiliary electrode is formed synchronously with the first electrode; The auxiliary electrode is made of the same material as the first electrode.

11. The method for preparing a display panel according to claim 9, wherein: After forming the first electrode and the auxiliary electrode, the method includes: Two undercut grooves corresponding to each auxiliary electrode are formed in the planarization layer, wherein the two undercut grooves corresponding to each auxiliary electrode have a portion located below the auxiliary electrode, and the openings of the two undercut grooves are respectively located on opposite sides of the auxiliary electrode; After the light-emitting layer is formed, the ends of the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode are respectively located in the two undercut grooves and are both connected to the auxiliary electrode.

12. The method for preparing a display panel according to claim 9, wherein: After forming the auxiliary electrode, the method includes: A supporting top layer is formed on a side of the auxiliary electrode away from the substrate; the orthographic projection of the auxiliary electrode in the thickness direction of the display panel is located within the orthographic projection of the supporting top layer in the thickness direction of the display panel, and the auxiliary electrode, the supporting top layer and the planarization layer form two grooves located on opposite sides of the auxiliary electrode; After the light-emitting layer is formed, the ends of the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode are respectively located in the two grooves and are both connected to the auxiliary electrode.

13. The method for preparing a display panel according to claim 12, wherein: After forming the auxiliary electrode, the method comprises: forming a top material layer on a side of the planarization layer, the first electrode and the auxiliary electrode away from the substrate; Etching the top material layer located outside the auxiliary electrode to form a supporting top layer; The two opposite sides of the etched auxiliary electrode are etched so that the orthographic projection of the auxiliary electrode in the thickness direction of the display panel is located within the orthographic projection of the supporting top layer in the thickness direction of the display panel, and the auxiliary electrode, the supporting top layer and the planarization layer form two grooves located on the opposite sides of the auxiliary electrode.

14. The method for preparing a display panel according to any one of claims 9 to 13, characterized in that: After forming the first electrode and the auxiliary electrode, the method includes: A pixel defining layer is formed on the planarization layer and on the side of the first electrode and the auxiliary electrode facing away from the substrate; the pixel defining layer is provided with a plurality of pixel openings and a plurality of electrode connection openings, and the electrode connection openings are arranged between two adjacent pixel openings; wherein the plurality of pixel openings correspond one-to-one to the plurality of light-emitting structures; the first electrode is at least partially exposed from the pixel opening, and at least a portion of the light-emitting material layer is located in the pixel opening; the plurality of electrode connection openings correspond one-to-one to the plurality of auxiliary electrodes; and the auxiliary electrode is located in the electrode connection opening.

15. The method for preparing a display panel according to claim 9, wherein: After forming the first electrode and the auxiliary electrode, the method includes: A pixel defining layer is formed on the planarization layer and the first electrode and the auxiliary electrode on a side away from the substrate; the pixel defining layer is provided with a plurality of pixel openings and a plurality of electrode connection openings, and the electrode connection openings are arranged between two adjacent pixel openings at intervals; wherein the plurality of pixel openings correspond to the plurality of light emitting structures one by one; the first electrode is at least partially exposed from the pixel opening; the plurality of electrode connection openings correspond to the plurality of auxiliary electrodes one by one; the auxiliary electrode is located in the electrode connection opening and exposed from the electrode connection opening; Two undercut grooves corresponding to each auxiliary electrode are formed in the planarization layer, wherein the two undercut grooves corresponding to each auxiliary electrode have a portion located below the auxiliary electrode, and the openings of the two undercut grooves are respectively located on opposite sides of the auxiliary electrode; After the light-emitting layer is formed, the ends of the second electrodes of the two adjacent light-emitting structures connected to the auxiliary electrode are respectively located in the two undercut grooves and are both connected to the auxiliary electrode.

16. The method for manufacturing a display panel according to any one of claims 9 to 13 and 15, characterized in that: At least a portion of the plurality of light-emitting structures are first light-emitting structures having a first light-emitting color, and at least a portion of the plurality of light-emitting structures are second light-emitting structures having a second light-emitting color; The forming of a light emitting material layer and a second electrode on a side of the first electrode facing away from the substrate comprises: forming a light-emitting material layer of a first light-emitting structure on a side of the first electrode facing away from the substrate; forming a second electrode of the first light emitting structure on a side of the light emitting material layer of the first light emitting structure away from the substrate; removing the light-emitting material of the first light-emitting structure and the second electrode of the first light-emitting structure in the region for forming the second light-emitting structure; In a region for forming a second light emitting structure, forming a light emitting material layer of the second light emitting structure located on a side of the first electrode facing away from the substrate; In the region for forming the light emitting structure, a second electrode of the second light emitting structure is formed on a side of the light emitting material layer of the second light emitting structure facing away from the substrate.

17. The method for manufacturing a display panel according to claim 16, wherein: After forming the second electrode of the first light emitting structure, the method includes: forming a first inorganic layer on a side of the second electrode of the first light emitting structure away from the substrate; Before forming a light-emitting material layer of the second light-emitting structure located on a side of the first electrode facing away from the substrate in a region for forming the second light-emitting structure, the method further comprises: removing the first inorganic layer; After forming the second electrode of the second light emitting structure, the method further includes: forming a second inorganic layer on a side of the second electrode of the second light emitting structure away from the substrate, wherein the second inorganic layer is connected to the first inorganic layer.

18. The method for preparing a display panel according to any one of claims 9 to 13 and 15, characterized in that: The light-emitting structures have the same light-emitting color, and the light-emitting material layer and the second electrode are formed on the side of the first electrode away from the substrate, including: A light emitting material layer and a second electrode are sequentially formed on a side of the first electrode facing away from the substrate.

19. The method for preparing a display panel according to claim 18, wherein: After forming a light emitting layer on a side of the planarization layer facing away from the substrate, the method comprises: An encapsulation layer is formed on a side of the light-emitting layer away from the substrate, wherein the encapsulation layer comprises an inorganic layer covering the light-emitting layer.

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