Display panel and manufacturing method thereof

Abstract

The invention discloses a display panel and a manufacturing method thereof. The display panel comprises a first substrate, a flat layer, a first electrode, a light-emitting layer and a second electrode which are sequentially arranged. The surface, far away from the first substrate, of the flat layer has concave-convex morphology; the first electrode continues the concave-convex morphology of the flat layer; the light-emitting layer continues the concave-convex morphology of the second electrode; the second electrode continues the concave-convex morphology of the light-emitting layer. The concave-convex morphology is easy to prepare through the double-flat-layer structure, the first electrode, the light-emitting layer and the second electrode form the concave-convex morphology, an original light propagation path is changed through the reflection effect and the refraction effect of the concave-convex morphology, light propagating at a large angle is reduced, total reflection in the display panel is reduced, and the display quality is improved. Therefore, the light extraction efficiency of the display panel is improved.

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 manufacturing method thereof. Background Art

[0002] Display panels, such as OLED (Organic Light-Emitting Diode) or QLED (Quantum Dot Light Emitting Diodes), have been increasingly widely used in various display devices such as mobile phones, tablets, computers, and televisions due to their self-luminous characteristics.

[0003] However, these self-luminous display panels generally have the problem of low light extraction efficiency.

[0004] Summary of the Invention

[0005] The purpose of the present application is to provide a display panel with high light extraction efficiency and a method for manufacturing the same.

[0006] The present application discloses a display panel, comprising:

[0007] first base;

[0008] a flat layer located on one side of the first substrate, the flat layer comprising a first flat layer close to the first substrate and a second flat layer away from the first substrate, the first flat layer having a flat surface close to the second flat layer, and the second flat layer having a concave-convex morphology;

[0009] a first electrode, located on a side of the flat layer away from the first substrate, the first electrode continuing the concave-convex morphology of the flat layer;

[0010] a light-emitting layer, located on a side of the first electrode away from the first substrate, the light-emitting layer continuing the concave-convex morphology of the first electrode;

[0011] The second electrode is located on a side of the light-emitting layer away from the first electrode, and the second electrode continues the concave-convex morphology of the light-emitting layer.

[0012] Optionally, the display panel further includes a pixel defining layer, the pixel defining layer is located between the first electrode and the light-emitting layer, and the pixel defining layer defines a pixel area and a non-pixel area; the concave-convex morphology of the planar layer is located in the pixel area.

[0013] Optionally, the concavo-convex topography of the planar layer includes a plurality of first convex structures, and the first convex structures convex toward the first electrode.

[0014] Optionally, a height of the first protruding structure in the first direction is less than or equal to a thickness of the second planar layer.

[0015] Optionally, the display panel further includes an isolation layer, wherein the isolation layer is located between the first flat layer and the second flat layer, and the thickness of the isolation layer is less than or equal to 500 nm.

[0016] Optionally, an angle between a portion of the outer surface of the first protruding structure and the first direction is greater than or equal to 40° and less than or equal to 60°.

[0017] Optionally, orthographic projections of a plurality of the first protrusion structures in the first direction are distributed in an edge region of an orthographic projection of the pixel area in the first direction.

[0018] Optionally, orthographic projections of the plurality of first protrusion structures in the first direction completely cover an orthographic projection area of ​​the pixel area in the first direction.

[0019] Optionally, the display panel further comprises a filling layer located on a side of the second electrode away from the light-emitting layer, a lens structure is provided in the filling layer, and the lens structure protrudes in a direction away from the second electrode.

[0020] Optionally, the orthographic projection of the lens structure in the first direction partially overlaps with the pixel area, and the overlapping area is greater than or equal to half of the orthographic projection area of ​​the lens structure in the first direction and is smaller than the orthographic projection area of ​​the lens structure in the first direction; the lens structure covers part of the concave-convex morphology.

[0021] Optionally, a plurality of lens structures are provided in the filling layer, and the plurality of lens structures are arranged around the edge of the pixel area.

[0022] Optionally, the refractive index of the lens structure is greater than the refractive index of the non-lens structure area in the filling layer.

[0023] Optionally, the filling layer includes a first filling layer located on the side of the second electrode away from the light-emitting layer; and a second filling layer located on the side of the first filling layer away from the second electrode; the lens structure is located in the second filling layer; the first filling layer includes a second protruding structure protruding toward the second electrode, and the orthographic projection of the second protruding structure in the first direction is located on the side of the lens structure away from the pixel area.

[0024] Optionally, the first filling layer includes a plurality of second protrusion structures, and the orthographic projections of the plurality of second protrusion structures in the first direction are arranged around the periphery of the lens structure.

[0025] Optionally, the first electrode is a reflective electrode, and the second electrode is a transmissive electrode.

[0026] Optionally, the first electrode is a transmissive electrode, and the second electrode is a reflective electrode.

[0027] The present application also discloses a method for manufacturing a display panel, comprising:

[0028] providing a first substrate;

[0029] A flat layer, a first electrode, a light-emitting layer and a second electrode are sequentially formed on one side of the first substrate; the flat layer has a concave-convex morphology, and the first electrode, the light-emitting layer and the second electrode continue the concave-convex morphology of the flat layer.

[0030] Optionally, the flattening layer includes a first flattening layer, an isolation layer, and a second flattening layer; when preparing the flattening layer, a negative resist is first coated on one side of the first substrate, and the exposed and developed layers are formed into the first flattening layer; an isolation layer is prepared on the side of the first flattening layer away from the first substrate; a positive resist is coated on the side of the isolation layer away from the first flattening layer, and the exposed and developed layers are formed into a second flattening layer having a concave-convex morphology.

[0031] Optionally, the manufacturing method of the display panel includes forming an encapsulation layer on a side of the second electrode away from the light-emitting layer; forming a lens structure on a side of the encapsulation layer away from the second electrode; forming a filling layer on a side of the encapsulation layer away from the second electrode, the filling layer wrapping the lens structure; and disposing a second substrate on a side of the filling layer away from the encapsulation layer.

[0032] Optionally, the manufacturing method of the display panel includes providing a second substrate; forming a second filling layer on one side of the second substrate, wherein the second filling layer has a concave structure on a side away from the second substrate; forming a first filling layer on a side of the second filling layer away from the second substrate, wherein the first filling layer fills the concave structure; bonding the first substrate and the second substrate through the first filling layer.

[0033] Compared with the related art, the present application makes it easy to prepare the concave-convex morphology through a double-flat layer structure, so that the first electrode, the light-emitting layer and the second electrode form a concave-convex morphology. The reflection and refraction of the concave-convex morphology change the original light propagation path, reduce the light propagating at large angles, thereby reducing the total reflection within the display panel and improving the light extraction efficiency of the display panel.

[0034] 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

[0035] 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.

[0036] FIG1 is a schematic structural diagram of an embodiment of a display panel of the present application.

[0037] FIG2 is a schematic structural diagram of another embodiment of a display panel of the present application.

[0038] FIG3 is a schematic structural diagram of another embodiment of a display panel of the present application.

[0039] FIG4 is a schematic structural diagram of another embodiment of a display panel of the present application.

[0040] FIG5 is a schematic structural diagram of another embodiment of a display panel of the present application.

[0041] FIG. 6 is a top view schematically showing the arrangement of the lens structure of an embodiment of a display panel of the present application.

[0042] FIG. 7 is a top view schematically showing the arrangement of the lens structure of another embodiment of the display panel of the present application.

[0043] FIG8 is a schematic top view of the arrangement of the first protruding structures of an embodiment of a display panel of the present application.

[0044] FIG9 is a schematic top view of the arrangement of the first protrusion structure of another embodiment of the display panel of the present application.

[0045] FIG. 10 is a schematic diagram of a manufacturing process of a display panel according to an embodiment of the present application.

[0046] FIG. 11 is a schematic diagram of the manufacturing process of the middle planar layer of an embodiment of the display panel of the present application.

[0047] FIG. 12 is a schematic diagram of a manufacturing process of a partial structure of a display panel according to an embodiment of the present application.

[0048] FIG. 13 is a schematic diagram of the manufacturing process of a partial structure of another embodiment of a display panel of the present application.

[0049] FIG. 14 is a schematic diagram of the manufacturing process of a partial structure of another embodiment of a display panel of the present application.

[0050] Explanation of the reference numerals: first substrate, 10; color filter layer 11; flat layer, 20; first flat layer, 21; second flat layer, 22; first protruding structure, 221; isolation layer, 23; first electrode, 30; pixel defining layer, 40; protruding column, 41; light-emitting layer, 50; second electrode, 60; encapsulation layer, 70; first inorganic encapsulation layer, 71; first organic encapsulation layer, 72; second inorganic encapsulation layer, 73; filling layer, 80; lens structure, 81; first filling layer, 82; second filling layer, 83; second protruding structure, 84; second substrate, 90; pixel area, 100; non-pixel area, 200. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In the related art, the display panel has low light extraction efficiency due to the waveguide effect and total reflection.

[0055] To solve the above technical problems, the present application provides a display panel, which includes:

[0056] a first substrate 10;

[0057] a flat layer 20 located on one side of the first substrate 10, the flat layer 20 including a first flat layer 21 close to the first substrate 10 and a second flat layer 22 away from the first substrate 10; the first flat layer 21 having a flat surface close to the second flat layer 22, and the second flat layer 22 having a concave-convex morphology;

[0058] The first electrode 30 is located on a side of the planar layer 20 away from the first substrate 10 , and the first electrode 30 continues the concave-convex morphology of the planar layer 20 ;

[0059] The light-emitting layer 50 is located on a side of the first electrode 30 away from the first substrate 10 , and the light-emitting layer 50 continues the concave-convex morphology of the first electrode 30 ;

[0060] The second electrode 60 is located on a side of the light emitting layer 50 away from the first electrode 30 . The second electrode 60 continues the concave-convex morphology of the light emitting layer 50 .

[0061] The present application uses a double-flat layer structure to make it easy to prepare a concave-convex morphology, so that the first electrode, the light-emitting layer and the second electrode form a concave-convex morphology. The reflection and refraction of the concave-convex morphology change the original light propagation path, reduce the light propagating at large angles, thereby reducing the total reflection within the display panel, and thus improving the light extraction efficiency of the display panel.

[0062] The following is a detailed description of the embodiments of the present application that are consistent with the above-mentioned creative concepts.

[0063] As shown in FIG1 , the first substrate 10 may be a rigid first substrate. Specifically, the rigid first substrate may be a glass first substrate or a PMMA (Polymethyl methacrylate) first substrate. Of course, the first substrate 10 may also be a flexible first substrate. Specifically, the flexible first substrate may be a PET (Polyethylene terephthalate) first substrate, a PEN (Polyethylene naphthalate two formic acid glycol ester) first substrate, or a PI (Polyimide) first substrate.

[0064] As shown in Figure 1, the flat layer 20 is located on one side of the first substrate 10. In an exemplary embodiment, a driving structure layer is provided between the first substrate 10 and the flat layer 20, which is not shown in the figure. The specific structure of the driving structure layer is flexibly set according to actual needs, and this application does not limit this. The flat layer 20 covers the first substrate 10, and the surface of the flat layer 20 on the side away from the first substrate 10 has a concave-convex morphology. The flat layer 20 includes an organic material layer, for example, it can be a photoresist material, and the concave-convex morphology can be prepared by an exposure process. The concave-convex morphology includes a first convex structure 221, and the first convex structure 221 protrudes from the flat layer 20 in a direction away from the first substrate 10. The slope angle of the surface of the first convex structure 221 on the side away from the first substrate 10 is α, 40°≤α≤60°. The slope angle α refers to the angle between the surface of the first protrusion structure 221 away from the first substrate 10 and the first direction. 40°≤α≤60° means that a portion of the surface of the first protrusion structure 221 away from the first substrate 10 has an angle α between 40° and 60° with the first direction. The portion can be any region of the surface of the first protrusion structure 221 away from the first substrate 10. In this embodiment, the first direction is a direction perpendicular to the plane of the first substrate 10.

[0065] As shown in FIG1 , the display panel of the present application further includes a first electrode 30, a light-emitting layer 50, and a second electrode 60. The first electrode 30 is located on the side of the flat layer 20 away from the first substrate 10, and the first electrode 30 continues the concave-convex morphology of the flat layer 20. The light-emitting layer 50 is located on the side of the first electrode 30 away from the flat layer 20, and the light-emitting layer 50 continues the concave-convex morphology of the first electrode 30. The light-emitting layer 50 can be an OLED (Organic Light-Emitting Diode) light-emitting layer or a QLED (Quantum Dot Light Emitting Diode) light-emitting layer. The second electrode 60 is located on the side of the light-emitting layer 50 away from the first electrode 30, and the second electrode 60 continues the concave-convex morphology of the light-emitting layer 50. In an optional embodiment, the first electrode 30 is a transmissive electrode and the second electrode 60 is a reflective electrode; in another optional embodiment, the first electrode 30 is a reflective electrode and the second electrode 60 is a transmissive electrode.

[0066] As shown in Figure 1, the display panel of the present application further includes a pixel defining layer 40, which is provided with pixel openings, dividing the display panel into a pixel region 100 and a non-pixel region 200. The aforementioned concavo-convex topography is provided within the pixel region 100. For example, the concavo-convex topography may overlap with the pixel defining layer 40 in a direction perpendicular to the first substrate 10, further improving light extraction and reducing the possibility of crosstalk between adjacent sub-pixels.

[0067] As shown in Figures 1 and 8, in an optional embodiment, the concavo-convex topography includes a plurality of first protruding structures 221. The plurality of first protruding structures 221 are located within the pixel region 100 and distributed along the edge of the pixel region 100. That is, the orthographic projections of the first protruding structures 221 in the first direction are distributed along the edge of the orthographic projection of the pixel region 100 in the first direction, and the orthographic projections of the first protruding structures 221 in the first direction are located within the orthographic projection of the pixel region 100 in the first direction and close to the boundary of the pixel region 100. The pixel defining layer 40 has a protruding column 41 structure at the edge of the pixel opening. The protruding column 41 is taller in the first direction than the first protruding structure 221.

[0068] As shown in Figures 1 and 9, in another optional embodiment, the orthographic projections of several first protrusion structures 221 in the first direction cover the orthographic projection area of ​​the pixel area 100 in the first direction. The specific arrangement of the several first protrusion structures 221 is set according to actual needs. For example, they can be arranged neatly in rows and columns, or in a honeycomb shape. Adjacent first protrusion structures 221 can be closely connected, or a certain gap can be retained. When a certain gap is retained, the maximum size of the gap between adjacent first protrusion structures 221 is smaller than the maximum size of the surface of the first protrusion structure 221 close to the first substrate.

[0069] As shown in FIG1 , the display panel of the present application further includes an encapsulation layer 70. The encapsulation layer 70 is located on the side of the second electrode 60 away from the light-emitting layer 50. The encapsulation layer 70 may continue the concave-convex morphology of the second electrode 60, or may not continue the concave-convex morphology of the second electrode 60. The encapsulation layer 70 may be an inorganic encapsulation layer, such as an aluminum oxide (Al2O3) layer, a silicon nitride (SiNx) layer, or a silicon oxide (SiOx) layer; the encapsulation layer 70 may be an organic encapsulation layer, such as an epoxy resin layer, a polyimide (PI) layer, a polymer imide (PBI), or a conventional acrylic material layer. The encapsulation layer 70 may be a single-layer structure or a multi-layer stacked structure.

[0070] As shown in FIG1 , the display panel of the present application further includes a filling layer 80 and a second substrate 90 . The filling layer 80 is located on a side of the encapsulation layer 70 away from the second electrode 60 . The filling layer 80 bonds the second substrate 90 and the encapsulation layer 70 .

[0071] As shown in FIG1 , in an optional embodiment, the planarization layer 20 includes a first planarization layer 21 and a second planarization layer 22. The first planarization layer 21 is positioned between the first substrate 10 and the second planarization layer 22. The side of the first planarization layer 21 closest to the first substrate 10 is bonded to the first substrate 10, while the side away from the first substrate 10 is flattened through pre-baking, exposure, development, and post-baking. The second planarization layer 22 is positioned on the side of the first planarization layer 21 away from the first substrate 10. The second planarization layer 22 is formed into first protruding structures 221 through pre-baking, exposure, development, and post-baking. The height of the first protruding structures 221 in the first direction is less than or equal to the thickness of the second planarization layer 22. The second planarization layer 22 may or may not be fully exposed. The thickness of the first planarization layer 21 may range from 1 μm to 3 μm, for example, 1 μm, 1.5 μm, 2 μm, 2.5 μm, or 3 μm. The thickness of the second planarization layer 22 may range from 1 μm to 2 μm, for example, 1 μm, 1.3 μm, 1.5 μm, 1.7 μm, or 2 μm. The thickness of the first planar layer 21 is greater than that of the second planar layer 22. Both the first planar layer 21 and the second planar layer 22 are made of an organic material, such as a photoresist. The first planar layer 21 and the second planar layer 22 can be made of the same photoresist material or different photoresist materials. When the first planar layer 21 and the second planar layer 22 are made of different photoresists, the first planar layer 21 can optionally be made of a negative photoresist and the second planar layer 22 can be made of a positive photoresist. This can take into account the advantages of both positive and negative photoresists, resulting in a better morphology for the first protruding structure 221 and a better flattening effect for the planar layer 20. The positive photoresist can be made of methyl methacrylate, styrene, or phenylene dioxide, while the negative photoresist can be made of nitrostyrene, styrene acrylonitrile copolymer, or styrene furazan copolymer.

[0072] As shown in Figures 1 and 2, in an optional embodiment, the planarization layer 20 further includes an isolation layer 23. The isolation layer 23 is located between the first planarization layer 21 and the second planarization layer 22. The isolation layer 23 may be an inorganic material layer, such as a silicon nitride (SiNx) or silicon oxide (SiOx) material layer. The thickness of the isolation layer 23 is less than or equal to 500 nm. Optionally, the thickness of the isolation layer 23 is 300 nm, 350 nm, 370 nm, 400 nm, or 421 nm. The provision of the isolation layer 23 can effectively prevent the problem of material miscibility between the first planarization layer 21 and the second planarization layer 22.

[0073] As shown in FIG5 , in an optional embodiment, the encapsulation layer 70 includes a first inorganic encapsulation layer 71, a first organic encapsulation layer 72, and a second inorganic encapsulation layer 73. The first inorganic encapsulation layer 71 is located on the side of the second electrode 60 away from the light-emitting layer 50. The side of the first inorganic encapsulation layer 71 near the second electrode 60 is in contact with the second electrode 60, and the side away from the second electrode 60 has a concave-convex morphology that continues the second electrode 60. The first organic encapsulation layer 72 is located on the side of the first inorganic encapsulation layer 71 away from the second electrode 60. The side of the first organic encapsulation layer 72 near the first inorganic encapsulation layer 71 is in contact with the first inorganic encapsulation layer 71, and the surface of the side away from the first inorganic encapsulation layer 71 is prepared as a flat surface. The second inorganic encapsulation layer 73 is located on the side of the first organic encapsulation layer 72 away from the first inorganic encapsulation layer 71. Both opposing surfaces of the second inorganic encapsulation layer 73 are flat. The refractive index n of the organic encapsulation layer is approximately 1.5, and the refractive index n of the inorganic encapsulation layer is approximately 1.8. A lens structure 81 is provided on the side of the second inorganic encapsulation layer 73 away from the first organic encapsulation layer 72. The lens structure 81 can be hemispherical or a columnar structure with a semicircular cross-section, or other structures similar to the above structures. The lens structure 81 protrudes in the direction away from the second electrode 60. The filling layer 80 covers and wraps the lens structure 81, that is, the lens structure 81 is located in the filling layer 80. The material of the lens structure 81 is different from that of the filling layer 80. The refractive index of the filling layer 80 is n=1.4, and the refractive index of the lens structure 81 is ≥1.5. For example, the refractive index of the lens structure 81 can be 1.5, 1.52, 1.55, 1.6, 1.7, etc. This method optimizes the light output angle of the first inorganic encapsulation layer 71, and effectively solves the problem that light is trapped in the first organic encapsulation layer 72 and cannot be effectively emitted. It also solves the problem that the high refractive index first organic encapsulation layer 72 material is difficult to print due to the doping of scattering particles, which clogs the nozzle.

[0074] As shown in FIG3 , in an optional embodiment, the encapsulation layer 70 includes a first inorganic encapsulation layer 71. The first inorganic encapsulation layer 71 is located on the side of the second electrode 60 away from the light-emitting layer 50. The side of the first inorganic encapsulation layer 71 proximal to the second electrode 60 is in contact with the second electrode 60, while the side away from the second electrode 60 has a concave-convex morphology that continues the second electrode 60. The filling layer 80 is located on the side of the first inorganic encapsulation layer 71 facing away from the second electrode 60. The filling layer 80 includes a first filling layer 82 and a second filling layer 83. One side of the second filling layer 83 is in contact with the second substrate 90, and the side of the second filling layer 83 facing away from the second substrate 90 is provided with a plurality of recessed structures. These recessed structures may be hemispherical, semicircular, or other similar structures. The first filling layer 82 is located on the side of the second filling layer 83 facing away from the second substrate 90. A portion of the first filling layer 82 fills the recessed structures of the second filling layer 83 to form the lens structure 81. The other portion of the first filling layer 82 is bonded to the second filling layer 83 and the first inorganic encapsulation layer 71. The refractive index n of the second filling layer 83 is approximately 1.5, and the refractive index of the first filling layer 82 is 1.5≤n≤1.8. For example, the refractive index of the first filling layer 82 can be 1.5, 1.52, 1.55, 1.6, 1.8, etc. This approach reduces total internal reflection at the interface between the first inorganic encapsulation layer 71 and the first filling layer 82, while also reducing color mixing and crosstalk issues through the focusing effect of the lens structure 81.

[0075] As shown in Figures 3, 6, and 7, in an optional embodiment, the lens structure 81 is located at the edge of the pixel area 100. Specifically, the orthographic projection of the lens structure 81 in the first direction partially overlaps with the orthographic projection of the pixel area 100 in the first direction, and the area of ​​the overlapping portion is greater than half the orthographic projection area of ​​the lens structure 81 in the first direction and less than the orthographic projection area of ​​the lens structure 81 in the first direction. The orthographic projection of the lens structure 81 in the first direction covers the highest point of at least one first protrusion structure 221. Optionally, multiple lens structures 81 are arranged around the edge of the pixel area 100.

[0076] As shown in Figure 4, in an optional embodiment, a second protruding structure 84 is further provided on the side of the second filling layer 83 facing away from the second substrate 90. The second protruding structure 84 protrudes from the surface of the second filling layer 83 toward the second electrode 60. The first filling layer 82 covers and wraps the second protruding structure 84, that is, the second protruding structure 84 is located within the first filling layer 82. The orthographic projection of the second protruding structure 84 in the first direction is located on the side of the orthographic projection of the lens structure 81 in the first direction away from the pixel area. Optionally, the orthographic projections of several second protruding structures 84 in the first direction surround the outer side of the orthographic projection of the lens structure 81 in the first direction. The second protruding structure 84 can be in the shape of a closely packed hemispherical shape, a cylinder with a trapezoidal cross section, or a cylinder with a semicircular cross section. The second protruding structure 84 can reflect light into the lens structure 81 through total internal reflection, thereby improving the light extraction efficiency and reducing the problems of color mixing and crosstalk.

[0077] As shown in Figures 3 and 4, in an optional embodiment, the display panel of the present application further includes a color filter layer 11. When the first electrode 30 is a transmissive electrode and the second electrode 60 is a reflective electrode, the color filter layer 11 is located between the first substrate 10 and the planar layer 20, and the orthographic projection of the color filter layer 11 in the first direction covers the outer boundary of the pixel area 100 and the lens structure 81. When the first electrode 30 is a reflective electrode and the second electrode 60 is a transmissive electrode, the color filter layer 11 is located between the second substrate 90 and the filling layer 80, and the orthographic projection of the color filter layer 11 in the first direction covers the outer boundary of the pixel area 100 and the lens structure 81.

[0078] As shown in FIG10 , the present application also discloses a method for manufacturing a display panel, comprising:

[0079] A first substrate 10 is provided.

[0080] A planar layer 20, a first electrode 30, a light emitting layer 50 and a second electrode 60 are sequentially formed on one side of the first substrate 10. The planar layer 20 has a concave-convex topography, and the first electrode 30, the light emitting layer 50 and the second electrode 60 continue the concave-convex topography of the planar layer 20.

[0081] As shown in Figure 11, in an optional embodiment, the planarization layer 20 includes a first planarization layer 21, an isolation layer 23, and a second planarization layer 22. To prepare the planarization layer 20, a negative resist is first applied to one side of the first substrate 10, and then exposed and developed to form the first planarization layer 21. An isolation layer 23 is then applied to the side of the first planarization layer 21 facing away from the first substrate 10. A positive resist is then applied to the side of the isolation layer 23 facing away from the first planarization layer 21, and then exposed and developed to form the second planarization layer 22 having a concave-convex topography, which includes a plurality of first protruding structures 221.

[0082] As shown in FIG12 , in an optional embodiment, the method for manufacturing a display panel further includes forming an encapsulation layer 70 on a side of the second electrode 60 remote from the light-emitting layer 50. A lens structure 81 is formed on a side of the encapsulation layer 70 remote from the second electrode. A filling layer 80 is formed on a side of the encapsulation layer 70 remote from the second electrode 60, the filling layer 80 encapsulating the lens structure. A second substrate 90 is disposed on a side of the filling layer 80 remote from the encapsulation layer 70.

[0083] As shown in FIG13 , in an optional embodiment, the method for manufacturing a display panel further includes providing a second substrate 90. A second filling layer 83 is formed on one side of the second substrate 90. The side of the second filling layer 83 facing away from the second substrate 90 has a recessed structure. A first filling layer 82 is formed on the side of the second filling layer 83 facing away from the second substrate 90. The first filling layer 82 fills the recessed structure to form a lens structure 81. The first substrate 10 and the second substrate 90 are bonded together via the first filling layer 82.

[0084] As shown in FIG14 , in an optional embodiment, the method for manufacturing a display panel further includes providing a second substrate 90. A second filling layer 83 is formed on one side of the second substrate 90. A recessed structure and a second protruding structure 84 are formed on a side of the second filling layer 83 away from the second substrate 90. The second protruding structure 84 is located outside the recessed structure. A first filling layer 82 is formed on a side of the second filling layer 83 away from the second substrate 90. The first filling layer 82 fills the recessed structure to form a lens structure 81. The first filling layer 82 also covers the second protruding structure 84. The first substrate 10 and the second substrate 90 are bonded together via the first filling layer 82.

[0085] 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.

[0086] 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.

[0087] 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: first base; A flat layer, located on one side of the first substrate, the flat layer includes a first flat layer close to the first substrate and a second flat layer far from the first substrate, the first flat layer has a flat surface on one side close to the second flat layer, and the second flat layer has a concave-convex morphology; A first electrode is located on a side of the flat layer away from the first substrate, and the first electrode continues the concave-convex morphology of the flat layer; A light-emitting layer, located on a side of the first electrode away from the first substrate, wherein the light-emitting layer continues the concave-convex morphology of the first electrode; The second electrode is located at a side of the light-emitting layer away from the first electrode, and the second electrode continues the concave-convex morphology of the light-emitting layer.

2. The display panel according to claim 1, characterized in that: The display panel further includes a pixel defining layer, wherein the pixel defining layer defines a pixel area and a non-pixel area; the concavo-convex morphology of the planar layer is located in the pixel area.

3. The display panel according to claim 2, characterized in that: The concavo-convex morphology of the planar layer includes a plurality of first convex structures, and the first convex structures bulge toward the first electrode.

4. The display panel according to claim 3, characterized in that: A height of the first protruding structure in the first direction is less than or equal to a thickness of the second planar layer.

5. The display panel according to claim 1, characterized in that: The display panel further includes an isolation layer, wherein the isolation layer is located between the first flat layer and the second flat layer, and the thickness of the isolation layer is less than or equal to 500 nm.

6. The display panel according to any one of claims 3 to 5, characterized in that: An angle between a portion of the outer surface of the first protruding structure and the first direction is greater than or equal to 40° and less than or equal to 60°.

7. The display panel according to any one of claims 3 to 5, characterized in that: The orthographic projections of the first protrusion structures in the first direction are distributed in edge regions of the orthographic projections of the pixel region in the first direction.

8. The display panel according to any one of claims 3 to 5, characterized in that: The orthographic projections of the plurality of first protrusion structures in the first direction cover the entire orthographic projection area of ​​the pixel region in the first direction.

9. The display panel according to claim 2, characterized in that: The display panel further includes a filling layer located on a side of the second electrode away from the light-emitting layer. A lens structure is disposed in the filling layer, and the lens structure protrudes in a direction away from the second electrode.

10. The display panel according to claim 9, characterized in that: The orthographic projection of the lens structure in the first direction partially overlaps with the pixel area, and the overlapping area is greater than or equal to half of the orthographic projection area of ​​the lens structure in the first direction, and is smaller than the orthographic projection area of ​​the lens structure in the first direction; the lens structure covers part of the concave-convex morphology.

11. The display panel according to claim 10, characterized in that: A plurality of lens structures are arranged in the filling layer, and the plurality of lens structures are arranged around the edge of the pixel area.

12. The display panel according to any one of claims 9 to 11, characterized in that: The refractive index of the lens structure is greater than the refractive index of the non-lens structure region in the filling layer.

13. The display panel according to any one of claims 9 to 11, characterized in that: The filling layer includes a first filling layer located on a side of the second electrode away from the light-emitting layer; and a second filling layer located on a side of the first filling layer away from the second electrode; the lens structure is located in the second filling layer; the first filling layer includes a second protruding structure protruding toward the second electrode, and the orthographic projection of the second protruding structure in the first direction is located on a side of the lens structure away from the pixel area.

14. The display panel according to claim 13, characterized in that: The first filling layer includes a plurality of second protrusion structures, and the orthographic projections of the plurality of second protrusion structures in the first direction are arranged around the periphery of the lens structure.

15. The display panel according to any one of claims 1 to 5 or claims 9 to 11, characterized in that: The first electrode is a reflective electrode, and the second electrode is a transmissive electrode.

16. The display panel according to any one of claims 1 to 5, characterized in that: The first electrode is a transmissive electrode, and the second electrode is a reflective electrode.

17. A method for manufacturing a display panel, characterized in that: include: providing a first substrate; forming a planar layer, a first electrode, a light-emitting layer and a second electrode in sequence on one side of the first substrate; The flat layer has a concavo-convex morphology, and the first electrode, the light-emitting layer and the second electrode continue the concavo-convex morphology of the flat layer.

18. The method for manufacturing a display panel according to claim 17, characterized in that: The flat layer includes a first flat layer, an isolation layer and a second flat layer. When preparing the flat layer, a negative resist is firstly coated on one side of the first substrate, and then exposed and developed to form the first flat layer. An isolation layer is prepared on the side of the first flat layer away from the first substrate. A positive resist is coated on the side of the isolation layer away from the first flat layer, and then exposed and developed to form a second flat layer with a concave-convex morphology.

19. The method for manufacturing a display panel according to claim 17, wherein: include: forming an encapsulation layer on a side of the second electrode away from the light-emitting layer; A lens structure is formed on a side of the encapsulation layer away from the second electrode; a filling layer is formed on a side of the encapsulation layer away from the second electrode, the filling layer wrapping the lens structure; and a second substrate is arranged on a side of the filling layer away from the encapsulation layer.

20. The method for manufacturing a display panel according to claim 17, wherein: include: providing a second substrate; forming a second filling layer on one side of the second substrate, wherein a side of the second filling layer away from the second substrate has a concave structure; A first filling layer is formed on a side of the second filling layer away from the second substrate, and the first filling layer fills the recessed structure; the first substrate and the second substrate are bonded together through the first filling layer.

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