Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device, the display panel comprises a substrate, a planarization layer, a light emitting layer and a reflection layer, the planarization layer is arranged on one side of the substrate, and the planarization layer is provided with a pixel opening; the light-emitting layer is arranged on the side, away from the substrate, of the planarization layer, and at least part of the light-emitting layer is located in the pixel opening; the reflecting layer is arranged on the side, away from the substrate, of the planarization layer, and the orthographic projection of the reflecting layer on the substrate and the orthographic projection of the slope part on the substrate are at least partially overlapped. According to the display panel, the propagation path and the emergent angle of the light rays are changed, so that more light rays can be emitted from the display panel, the light extraction efficiency can be improved, and the optical performance is improved.

Description

Technical Field

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

[0002] Organic Light Emitting Display (OLED) and flat-panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, the light extraction efficiency of current display devices needs to be improved. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a display panel and a manufacturing method thereof, and a display device, which are conducive to improving light extraction efficiency.

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

[0006] substrate;

[0007] A planarization layer is disposed on one side of the substrate, and a pixel opening is opened in the planarization layer; the pixel opening includes a bottom wall and a side wall, and the side wall includes a slope portion;

[0008] A light-emitting layer is disposed on a side of the planarization layer away from the substrate, wherein at least a portion of the light-emitting layer is located in the pixel opening;

[0009] The reflective layer is arranged on a side of the planarization layer away from the substrate, and an orthographic projection of the reflective layer on the substrate at least partially overlaps with an orthographic projection of the slope portion on the substrate.

[0010] In one embodiment, the display panel further includes:

[0011] A reflective structure is arranged on a side of the reflective layer away from the substrate, and an orthographic projection of the slope portion on the substrate is located within an orthographic projection of the reflective structure on the substrate;

[0012] Preferably, an orthographic projection of the slope portion on the substrate is located within an orthographic projection of the reflective layer on the substrate.

[0013] In one embodiment, the reflective structure comprises:

[0014] A first light-transmitting layer is disposed on a side of the light-emitting layer away from the substrate, the first light-transmitting layer fills the pixel opening and at least covers the slope portion;

[0015] A second light-transmitting layer is disposed on a side of the first light-transmitting layer away from the substrate, and a refractive index of the second light-transmitting layer is smaller than a refractive index of the first light-transmitting layer;

[0016] Preferably, the distance between the surface of the first light-transmitting layer away from the substrate and the bottom wall is greater than the depth of the pixel opening;

[0017] Preferably, the first light-transmitting layer comprises a heat-curable optical adhesive;

[0018] Preferably, the refractive index of the second light-transmitting layer is 1-1.5;

[0019] Preferably, the second light-transmitting layer comprises a hollow silicon dioxide layer;

[0020] Preferably, the second light-transmitting layer comprises a lithium fluoride layer;

[0021] Preferably, the second light-transmitting layer comprises an organic material layer having a porous structure.

[0022] In one embodiment, the planarization layer includes a first planarization portion and a second planarization portion;

[0023] In a direction perpendicular to the substrate, the thickness of the first planarized portion is smaller than the thickness of the second planarized portion, and an orthographic projection of the second planarized portion on the substrate is located on an outer peripheral side of an orthographic projection of the first planarized portion on the substrate;

[0024] Preferably, the bottom wall is located on a surface of the first planarized portion away from the substrate, and the side wall is located on a surface of the second planarized portion away from the substrate;

[0025] Preferably, the angle formed by the slope portion and the plane where the bottom wall is located ranges from 20° to 55°;

[0027] Preferably, the slope portion comprises an inclined surface or a curved surface;

[0028] Preferably, an orthographic projection of an end portion of the pixel opening close to the substrate on the substrate is located within an orthographic projection of an end portion of the pixel opening far from the substrate on the substrate.

[0029] In one embodiment, the display panel includes a first electrode, the first electrode is disposed between the substrate and the light-emitting layer, and the first electrode is at least partially exposed to the pixel opening; the first electrode and the reflective layer are an integral structure;

[0030] Preferably, the orthographic projection of the reflective layer on the substrate is located on the outer peripheral side of the orthographic projection of the first electrode on the substrate; preferably, the orthographic projection of the reflective layer on the substrate is located within the orthographic projection of the light-emitting layer on the substrate;

[0031] Preferably, the display panel comprises a second electrode, the second electrode is arranged on a side of the light-emitting layer away from the first electrode, and the second electrode, the light-emitting layer and the first electrode form a light-emitting unit;

[0032] Preferably, the first electrodes of adjacent light-emitting units are arranged at intervals;

[0033] Preferably, the first electrode comprises an anode, and the second electrode comprises a cathode;

[0034] Preferably, the display panel comprises an insulating layer, the insulating layer is arranged between the reflective layer and the light-emitting layer, and the orthographic projection of the insulating layer on the substrate is located on the outer peripheral side of the orthographic projection of the bottom wall on the substrate;

[0035] Preferably, the insulating layer comprises organic glue or inorganic material.

[0036] In one embodiment, the reflective layer is disposed on a side of the light-emitting layer away from the substrate, and an orthographic projection of the slope portion on the substrate is located within an orthographic projection of the reflective layer on the substrate;

[0037] Preferably, the orthographic projection of the reflective layer on the substrate is located on the outer peripheral side of the orthographic projection of the bottom wall on the substrate.

[0038] In one embodiment, the display panel includes a first encapsulation layer, the first encapsulation layer is disposed between the light-emitting layer and the first light-transmitting layer, and the orthographic projection of the light-emitting layer on the substrate is located within the orthographic projection of the first encapsulation layer on the substrate;

[0039] Preferably, the display panel further comprises a second encapsulation layer, wherein the second encapsulation layer is located on a side of the first encapsulation layer away from the substrate;

[0040] Preferably, the second light-transmitting layer includes the second encapsulation layer;

[0041] Preferably, the display panel further comprises a third encapsulation layer, and the third encapsulation layer is located on a side of the second encapsulation layer away from the substrate;

[0042] Preferably, the refractive index of the first light-transmitting layer is greater than or equal to the refractive index of the first encapsulation layer.

[0043] Based on the same inventive concept, the present application also discloses a method for preparing a display panel, the method comprising:

[0044] A planarization layer is formed on one side of the substrate,

[0045] and forming a pixel opening in the planarization layer; wherein the pixel opening comprises a bottom wall and a side wall, and the side wall comprises a slope portion;

[0046] A light-emitting layer and a reflective layer are formed on a side of the planarization layer away from the substrate; wherein the light-emitting layer is at least partially located in the pixel opening, and the orthographic projection of the reflective layer on the substrate at least partially overlaps with the orthographic projection of the slope portion on the substrate. In one embodiment, the step of forming a planarization layer on one side of the substrate and forming a pixel opening in the planarization layer includes:

[0047] The planarization layer is pattern-exposed and opened by a half-tone process to form a first planarization portion and a second planarization portion; wherein the thickness of the first planarization portion is less than the thickness of the second planarization portion, and a portion of the second planarization portion that is higher than the first planarization portion is enclosed with the first planarization portion to form the pixel opening;

[0048] Preferably, after the step of forming a light-emitting layer and a reflective layer on a side of the planarization layer away from the substrate, the preparation method further comprises: forming a first encapsulation layer on a side of the light-emitting layer away from the substrate;

[0049] Preferably, after the step of forming a first encapsulation layer on a side of the light-emitting layer away from the substrate, the preparation method further comprises:

[0050] A first light-transmitting layer and a second light-transmitting layer are formed on a side of the first encapsulation layer away from the substrate; wherein the first light-transmitting layer fills the pixel opening and at least covers the slope portion; the second light-transmitting layer is disposed on a side of the first light-transmitting layer away from the substrate, and the refractive index of the second light-transmitting layer is less than the refractive index of the first light-transmitting layer;

[0051] Preferably, the step of forming a light-emitting layer and a reflective layer on a side of the planarization layer away from the substrate comprises: manufacturing a first electrode and the reflective layer on the same layer, wherein the reflective layer is located on the outer peripheral side of the first electrode and covers the slope portion; forming an insulating layer on a side of the reflective layer away from the substrate, wherein the insulating layer is disconnected at the pixel opening; and forming the light-emitting layer on a side of the first electrode away from the substrate.

[0052] Preferably, the step of forming a light-emitting layer and a reflective layer on a side of the planarization layer away from the substrate comprises: manufacturing a light-emitting layer, forming the reflective layer on a side of the light-emitting layer away from the substrate, wherein the reflective layer is disconnected at the pixel opening.

[0053] Based on the same inventive concept, the present application also discloses a display device, which includes the above-mentioned display panel.

[0054] Compared with the prior art, the display panel provided in the present application can reflect part of the light emitted by the light-emitting layer by setting a reflective layer on the slope portion, especially can reflect the light with a larger incident angle and emit it at a smaller angle, thereby changing the propagation path and the emission angle of the light, so that more light can be emitted from the display panel, which can improve the light extraction efficiency and enhance the optical performance.

[0055] At the same time, the pixel opening is directly opened on the planarization layer to limit the range of light emitted by the light-emitting layer to form a pixel display area, which can save a mask process originally used to define the pixel light-emitting area, thereby simplifying the process flow. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0057] Figure 1 is a structural schematic diagram of a related display panel;

[0058] Figure 2 A schematic diagram of the structure of a display panel provided in one embodiment of the present application;

[0059] Figure 3 A schematic diagram of the structure of a planarization layer of a display panel provided in one embodiment of the present application;

[0060] Figure 4 A schematic diagram of the structure of a display panel provided in another embodiment of the present application;

[0061] Figure 5 A schematic diagram of the structure of a display panel provided in another embodiment of the present application;

[0062] Figure 6 A schematic diagram of the structure of a display panel provided in another embodiment of the present application;

[0063] Figure 7 A flow chart of a method for preparing a display panel provided in another embodiment of the present application;

[0064] Figure 8 A schematic diagram of a portion of the structure of a display panel during the preparation process provided by an embodiment of the present application;

[0065] Fig. 9 A schematic diagram of a portion of the structure of a display panel during the preparation process provided by an embodiment of the present application;

[0066] Fig.10 A schematic diagram of a portion of the structure of a display panel during the preparation process provided by an embodiment of the present application;

[0067] Fig.11 A schematic diagram of a portion of the structure of a display panel during the preparation process provided by another embodiment of the present application;

[0068] Fig.12 A partial structural schematic diagram of a display panel during the preparation process provided by another embodiment of the present application.

[0069] Marking Description:

[0070] 100. Display panel; 1. Substrate; 2. Planarization layer; 20. Pixel opening; 201. First planarization portion; 202. Second planarization portion; 203. Slope portion; 3. Light-emitting unit; 31. First electrode; 32. Light-emitting layer; 33. Second electrode; 4. Insulating layer; 5. Reflection structure; 51. First light-transmitting layer; 52. Second light-transmitting layer; 61. First encapsulation layer; 62. Second encapsulation layer; 63. Third encapsulation layer; 7. Reflection layer. DETAILED DESCRIPTION

[0071] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0072] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0073] In display devices, large-angle emitted light is often bounded by total reflection between stacked interfaces, which increases light loss and affects the light extraction efficiency of the device. Therefore, it is crucial for display devices to improve the original light output path through reasonable structural design so that as much light as possible can be extracted.

[0074] Reference Figure 1 As shown, it is a schematic diagram of the structure of a related display panel, which includes a substrate 1 and a pixel definition layer arranged in a direction away from the substrate 1, a light-emitting unit 3 and a first encapsulation layer 61, a second encapsulation layer 62 and a third encapsulation layer 63. After long-term research by the inventor, it is found that since the first encapsulation layer 61 generally adopts a high-refractive material and the second encapsulation layer 62 generally adopts a low-refractive material, a high-low-refractive interface will be formed between the first encapsulation layer 61 and the second encapsulation layer 62, so that most of the light is constrained in a waveguide mode due to total reflection, affecting the light extraction efficiency. Among them, the waveguide mode refers to the light being constrained to propagate in a certain structure due to the difference in refractive index between the film layers. For example, when the light is emitted from the first encapsulation layer 61 with a higher refractive index to the second encapsulation layer 62 with a lower refractive index, since the incident angle of most of the light is greater than the critical angle, total reflection occurs, and it is constrained to propagate in the first encapsulation layer 61 (as shown by the arrow in the figure).

[0075] Based on this, the present application provides a solution for a display panel, as detailed in the following embodiments.

[0076] Reference Figure 2 As shown, an embodiment of the present application discloses a display panel 100, which includes a substrate 1, a planarization layer 2, a light-emitting layer 32 and a reflective layer 7, wherein the planarization layer 2 is arranged on one side of the substrate 1, the planarization layer 2 is provided with a pixel opening 20, the pixel opening 20 includes a bottom wall and a side wall, and the side wall includes a slope portion 203. The light-emitting layer 32 is arranged on the side of the planarization layer 2 away from the substrate 1, and the light-emitting layer 32 is at least partially located in the pixel opening 20. The reflective layer 7 is arranged on the side of the planarization layer 2 away from the substrate 1, and the orthographic projection of the reflective layer 7 on the substrate 1 at least partially overlaps with the orthographic projection of the slope portion 203 on the substrate 1.

[0077] Specifically, the surrounding side wall and bottom wall together enclose the pixel opening 20, and the side wall of the pixel opening 20 has a slope portion 203, and the reflective layer 7 covers part or all of the slope portion 203. In the pixel opening 20, the light emitted by the light-emitting layer 32 can be divided into small-angle light, medium-angle light, and large-angle light according to the angle of upward incidence. The small-angle light is close to the vertical direction of the substrate 1, the large-angle light is close to the parallel direction of the substrate 1, and the medium-angle light is between the two. Among them, the small-angle light can be emitted directly upward, and the large-angle light can be transmitted to the reflective layer 7 above the slope portion 203, and is totally reflected by the reflective layer 7 and emitted at a small angle.

[0078] The display panel 100 provided in the embodiment of the present application can reflect part of the light emitted by the light-emitting layer 32 by setting a reflective layer 7 on the slope portion 203, especially can reflect the light with a larger incident angle and emit it at a smaller angle, thereby changing the propagation path and the emission angle of the light, so that more light can be emitted from the display panel 100, which can improve the light extraction efficiency and enhance the optical performance.

[0079] At the same time, the pixel opening 20 is directly opened on the planarization layer 2 to limit the range of light emitted by the light-emitting layer 32 to form a pixel display area, which can save a mask process originally used to define the pixel light-emitting area, thereby simplifying the process flow.

[0080] Reference Figure 4 As shown, in one embodiment, the display panel 100 further includes a reflective structure 5 , which is disposed on a side of the reflective layer 7 away from the substrate 1 , and the orthographic projection of the slope portion 203 on the substrate 1 is located within the orthographic projection of the reflective structure 5 on the substrate 1 .

[0081] Optionally, the orthographic projection of the slope portion 203 on the substrate 1 is located within the orthographic projection of the reflective layer 7 on the substrate 1. Specifically, the reflective structure 5 and the reflective layer 7 both cover the slope portion 203.

[0082] In this embodiment, part of the light, such as medium-angle light and part of the large-angle light, can be reflected to the reflective layer 7 on the slope portion 203 through the reflective structure 5, and then emitted at a smaller angle after being reflected by the reflective layer 7. By combining the light that is difficult to emit with the reflective layer 7 on the slope, the light emission path is changed to become small-angle light that is easy to emit, thereby further enhancing the light emission efficiency.

[0083] Reference Figure 4 As shown, in one embodiment, the reflective structure 5 includes a first light-transmitting layer 51 and a second light-transmitting layer 52, the first light-transmitting layer 51 is disposed on a side of the light-emitting layer 32 away from the substrate 1, the first light-transmitting layer 51 fills the pixel opening 20, and at least covers the slope portion 203. That is, the first light-transmitting layer 51 extends outward from the pixel opening 20 to the periphery of the pixel opening 20. The second light-transmitting layer 52 is disposed on a side of the first light-transmitting layer 51 away from the substrate 1, and the refractive index of the second light-transmitting layer 52 is less than the refractive index of the first light-transmitting layer 51.

[0084] Optionally, the distance H1 between the surface of the first light-transmitting layer 51 away from the substrate 1 and the bottom wall is greater than the depth H2 of the pixel opening 20. That is, the first light-transmitting layer 51 can fill the entire pixel opening 20 and extend outward to cover the slope portion 203. Optionally, the first light-transmitting layer 51 includes a heat-curing optical adhesive. For example, the heat-curing optical adhesive is filled in the pixel opening 20 and extends outward to form the first light-transmitting layer 51.

[0085] Optionally, the refractive index of the second light-transmitting layer 52 is within a range of 1-1.5. For example, the refractive index of the second light-transmitting layer 52 may be 1, 1.1, 1.2, 1.3, 1.4, 1.5, or the like.

[0086] Optionally, the second light-transmitting layer 52 includes a hollow silicon dioxide layer.

[0087] Optionally, the second light-transmitting layer 52 includes a lithium fluoride layer.

[0088] Optionally, the second light-transmitting layer 52 includes an organic layer with a porous structure. The air in the pores of the organic layer can be used to reduce the refractive index of the entire material. The refractive index of air is 1, which is lower than that of most organic materials. For example, hollow silica is added to the organic material, and the second light-transmitting layer 52 is formed on the first light-transmitting layer 51 by a printing process.

[0089] Among them, the first light-transmitting layer 51 adopts a high refractive index material, the second light-transmitting layer 52 adopts a low refractive index material, and a high-low refractive interface is formed between the second light-transmitting layer 52 and the first light-transmitting layer 51, which reflects the light emitted by the light-emitting unit 3 and then emits it outward from the pixel opening 20, thereby changing the propagation path and emission angle of the light, so that more light can be emitted from the display panel 100, which can improve the light extraction efficiency and enhance the optical performance.

[0090] Reference Figure 2 , Figure 3 As shown, in one embodiment, the planarization layer 2 includes a first planarization portion 201 and a second planarization portion 202. With the direction perpendicular to the substrate 1 as the thickness or height direction, the thickness of the first planarization portion 201 is less than the thickness of the second planarization portion 202. The orthographic projection of the second planarization portion 202 on the substrate 1 is located on the outer peripheral side of the orthographic projection of the first planarization portion 201 on the substrate 1, so that the portion of the second planarization portion 202 that is higher than the first planarization portion 201 and the first planarization portion 201 together enclose a pixel opening 20.

[0091] Specifically, by thickening the planarization layer and performing patterned exposure and opening operations on the film layer in combination with a halftone process, the pixel opening 20 can be accurately defined, and while achieving this purpose, the use of pixel definition masks can be reduced. The bottom wall of the pixel opening 20 is located on the surface of the first planarization portion 201 away from the substrate 1, and the side wall of the pixel opening 20 is located on the surface of the second planarization portion 202 away from the substrate 1.

[0092] Specifically, the thickness of the planarization layer 2 is the thickness of the second planarization portion 202. The greater the thickness of the planarization layer 2, the greater the depth of the pixel opening 20. For example, the depth H2 of the pixel opening 20 may be 2 μm.

[0093] Optionally, the angle a formed by the slope portion 203 and the plane where the bottom wall of the pixel opening 20 is located is in the range of 20°-55°. Optionally, the slope portion 203 includes an inclined surface or a curved surface. That is, the slope of the inclined surface is in the range of 20°-55°, or the angle at which the tangent surface at a certain point on the curved surface deviates from the plane where the planarization layer 2 is located is in the range of 20°-55°. For example, the angle a can be 20°, 30°, 35°, 40°, 45°, 50°, 55°, etc.

[0094] Optionally, the orthographic projection of the end of the pixel opening 20 close to the substrate 1 on the substrate 1 is located within the orthographic projection of the end of the pixel opening 20 far from the substrate 1 on the substrate 1. That is, the pixel opening 20 is an inverted trapezoidal hole or an inverted conical hole that is wide at the top and narrow at the bottom, and with the center of the pixel opening 20 as a reference, the inclination direction of the slope portion 203 is low inside and high outside.

[0095] The structural design of the pixel opening 20 helps to form a required light propagation path and improve the stability of the pixel light emitting structure.

[0096] Reference Figure 5 As shown, in one embodiment, the display panel 100 includes a first electrode 31, which is disposed between the substrate 1 and the light-emitting layer 32, and a portion of the first electrode 31 is exposed in the pixel opening 20. In addition, the first electrode 31 and the reflective layer 7 are an integral structure and can be made of the same material and the same layer.

[0097] Optionally, the orthographic projection of the reflective layer 7 on the substrate 1 is located on the outer peripheral side of the orthographic projection of the first electrode 31 on the substrate 1. The inner edge of the reflective layer 7 is connected to the first electrode 31.

[0098] Optionally, the orthographic projection of the reflective layer 7 on the substrate 1 is located within the orthographic projection of the light emitting layer 32 on the substrate 1 . The outer edge of the reflective layer 7 is located inside the outer edge of the light emitting layer 32 .

[0099] Specifically, a plurality of pixel openings 20 are formed on the planarization layer 2 , and the first electrodes 31 and the reflective layer 7 corresponding to adjacent pixel openings 20 are spaced apart from each other to form an integrated structure.

[0100] Among them, the reflective layer 7 and the first electrode 31 adopt a non-full-surface design, which can not only meet the reflection requirements, but also effectively avoid the screen splitting problem caused by outgas, and ensure the structural stability of the display device. Among them, outgas refers to the phenomenon that the gas inside the material in the display device escapes from the inside of the material under specific conditions (such as temperature changes, heating during the manufacturing process, etc.), which may cause problems such as screen splitting and internal pollution.

[0101] Optionally, the display panel 100 includes a second electrode 33 , and the first electrode 31 , the light-emitting layer 32 , and the second electrode 33 are stacked in a direction away from the substrate 1 to form a light-emitting unit 3 .

[0102] Optionally, the first electrodes 31 of adjacent light emitting units 3 are arranged at intervals. The first electrode 31 is preferably an anode, and the second electrode 33 is preferably a cathode.

[0103] Specifically, a metal layer is laid in the pixel opening 20 to serve as the first electrode 31, and the portion of the metal layer extending to the slope portion 203 serves as a reflective layer 7, which can change the emission path and work together with the high and low folding interfaces between the first light-transmitting layer 51 and the second light-transmitting layer 52 to convert large-angle reflected light that is difficult to emit into small-angle light that is easy to emit.

[0104] Furthermore, the display panel 100 includes an insulating layer 4 disposed between the reflective layer 7 and the light emitting layer 32 , and an orthographic projection of the insulating layer 4 on the substrate 1 is located at the outer peripheral side of an orthographic projection of the bottom wall of the pixel opening 20 on the substrate 1 .

[0105] Specifically, an insulating layer 4 is laid on the side wall of the pixel opening 20 to separate the reflective layer 7 from the light-emitting layer 32, thereby preventing poor light emission and crosstalk problems from occurring at the slope portion 203. The insulating layer 4 adopts a non-full-surface design, which can also avoid screen splitting due to outgas, thereby ensuring the stability of light propagation and the reliability of the display effect.

[0106] Optionally, the insulating layer 4 includes an organic glue material or an inorganic material.

[0107] Reference Figure 6 As shown, in some other embodiments, the first electrode 31 is at least partially exposed to the pixel opening 20 . In this embodiment, the first electrode 31 does not extend to the slope portion 203 .

[0108] The display panel 100 includes a reflective layer 7 , which is disposed between the light emitting layer 32 and the first light-transmitting layer 51 . The orthographic projection of the slope portion 203 on the substrate 1 is located within the orthographic projection of the reflective layer 7 on the substrate 1 .

[0109] Optionally, the orthographic projection of the reflective layer 7 on the substrate 1 is outside the orthographic projection of the end of the pixel opening 20 close to the substrate 1 on the substrate 1. In this way, the reflective layer 7 will not affect the light emitting range of the light emitting unit 3.

[0110] Specifically, the reflective layer 7 covers the slope portion 203 and is disposed between the light-emitting layer 32 and the first light-transmitting layer 51, and can work together with the high-low folding interface between the first light-transmitting layer 51 and the second light-transmitting layer 52 to change the emission path, and convert the large-angle reflected light that is not easy to emit into the small-angle light that is easy to emit. In addition, the reflective layer 7 adopts a non-whole-surface design to meet the transmittance and reflectivity requirements of the screen body, and at the same time, it can effectively avoid the screen splitting problem caused by outgas, and ensure the structural stability of the display device.

[0111] Reference Figure 5 , Figure 6 As shown, in some embodiments, the display panel 100 includes a first encapsulation layer 61, which is disposed between the light-emitting layer 32 and the first light-transmitting layer 51, and the orthographic projection of the light-emitting layer 32 on the substrate 1 is located within the orthographic projection of the first encapsulation layer 61 on the substrate 1, and the first encapsulation layer 61 covers the light-emitting unit 3 to protect the light-emitting unit 3. The first encapsulation layer 61 is an inorganic layer, and the inorganic layer has high density to isolate water and oxygen.

[0112] Optionally, the display panel 100 further includes a second encapsulation layer 62, which is located on a side of the first encapsulation layer 61 away from the substrate 1, which is conducive to improving the encapsulation effect. The second encapsulation layer 62 is an organic layer, so it has a large thickness to flatten the surface of the display panel 100. Optionally, the second encapsulation layer 62 can be used as a second light-transmitting layer, and the refractive index of the second encapsulation layer 62 is less than that of the first light-transmitting layer 51.

[0113] Optionally, the display panel 100 further includes a third encapsulation layer 63, which is located on the side of the second encapsulation layer 62 away from the substrate 1, further improving the encapsulation effect. The third encapsulation layer 63 is an inorganic layer, realizing inorganic-organic-inorganic three-layer encapsulation. The inorganic encapsulation can be prepared by chemical vapor deposition, which is beneficial to improving the compactness and encapsulation effect of the encapsulation layer, and the organic encapsulation can be prepared by inkjet printing.

[0114] Optionally, the refractive index of the first light-transmitting layer 51 is greater than or equal to the refractive index of the first encapsulation layer 61. That is, the first light-transmitting layer 51 is a high-refractive material, and the light emitted by the light-emitting unit 3 is emitted from the first encapsulation layer 61, then enters the first light-transmitting layer 51, and then reflects at the high-low refractive interface between the first light-transmitting layer 51 and the second light-transmitting layer 52, so as to adjust the light path, and further reflects at the slope through the reflective layer, so as to enhance the control effect of the light.

[0115] In some embodiments, the pixel opening 20 includes a first type of opening, a second type of opening, and a third type of opening, and the first type of opening, the second type of opening, and the third type of opening are respectively used to accommodate light-emitting units 3 with different colors of emitted light, thereby improving the richness of the display of the display panel 100. Exemplarily, the light-emitting units 3 of different colors include light-emitting units R, light-emitting units B, and light-emitting units G. Further, the first type of opening, the second type of opening, and the third type of opening can be set as needed, and their sizes may be different, and there is no specific limitation.

[0116] Taking the hollow silicon dioxide used in the second light-transmitting layer 52 as an example, the forward intensity changes of each color light of different schemes and their association with power consumption reduction are tested. Among them, scheme one is to form a first light-transmitting layer 51 between the first encapsulation layer 61 and the second encapsulation layer 62, without the second light-transmitting layer 52, and the second encapsulation layer 62 uses a low-refractive material; scheme two is to form a first light-transmitting layer 51 and a second light-transmitting layer 52 between the first encapsulation layer 61 and the second encapsulation layer 62, and the refractive index of the second light-transmitting layer 52 is 1.4; scheme three is to form a first light-transmitting layer 51 and a second light-transmitting layer 52 between the first encapsulation layer 61 and the second encapsulation layer 62, and the refractive index of the second light-transmitting layer 52 is 1.2. After experimental verification, the corresponding forward intensity changes of the light-emitting unit R, the light-emitting unit G, and the light-emitting unit B and their association with power consumption reduction are shown in Table 1, Table 2, and Table 3, respectively.

[0117] Table 1

[0118]

[0119] Table 2

[0120]

[0121] Table 3

[0122]

[0123] The above results show that the light extraction efficiency of the display panel of the present application is greatly improved. For example, when the first light-transmitting layer is matched with the second light-transmitting layer with different parameters, the forward intensity is significantly improved compared with without the second light-transmitting layer. Moreover, as the light extraction efficiency is improved, the power consumption is reduced by a considerable percentage, achieving the dual goals of improving the display effect and reducing power consumption. At the same time, the forward intensity of different colors of light (R, G, B) is also optimized, which helps to improve the accuracy and vividness of the displayed colors, thereby improving the comprehensive display performance of the display device.

[0124] In general, the high-low refracting interface and slope reflection work together in the display device to have a significant impact on the propagation and emission of light. The high-low refracting interface causes light to refract and reflect at the interface, changing the propagation direction of light. When the light that was originally bound to the waveguide mode due to total reflection encounters the low-refracting packaging material on the high-refracting material, its optical path is adjusted. The slope reflection further enhances the light manipulation effect. The angle design of the slope gives it a strong reflective property, which works synergistically with the refraction and reflection of the high-low refracting interface to change the emission path of large-angle reflected light that is difficult to emit, turning it into small-angle light that is easy to emit, thereby achieving the purpose of enhancing light emission efficiency.

[0125] Reference Figure 7 As shown, another embodiment of the present application provides a method for preparing a display panel 100, the method comprising the following steps:

[0126] Step S10, forming a planarization layer 2 on one side of the substrate 1, and forming a pixel opening 20 on the planarization layer 2; wherein the pixel opening 20 includes a bottom wall and a side wall, and the side wall of the pixel opening 20 includes a slope portion 203; Figure 8 shown.

[0127] Step S20, forming a light-emitting layer 32 and a reflective layer 7 on the side of the planarization layer 2 away from the substrate 1; wherein the light-emitting layer 32 is at least partially located in the pixel opening 20, and the orthographic projection of the reflective layer 7 on the substrate 1 at least partially overlaps with the orthographic projection of the slope portion 203 on the substrate 1; Fig. 9 shown.

[0128] The method for preparing the display panel 100 provided in the embodiment of the present application can reflect part of the light emitted by the light-emitting layer 32 by setting a reflective layer 7 on the slope portion 203, especially can reflect the light with a larger incident angle and emit it at a smaller angle, thereby changing the propagation path and the emission angle of the light, so that more light can be emitted from the display panel 100, which can improve the light extraction efficiency and enhance the optical performance.

[0129] In some embodiments, step S10 forms a planarization layer 2 on one side of the substrate 1 and forms a pixel opening 20 in the planarization layer 2, including:

[0130] Step S11, using a halftone process to pattern-expose and open the planarization layer 2 to form a first planarization portion 201 and a second planarization portion 202; wherein the thickness of the first planarization portion 201 is less than the thickness of the second planarization portion 202, and the portion of the second planarization portion 202 that is higher than the first planarization portion 201 is enclosed with the first planarization portion 201 to form a pixel opening 20.

[0131] Optionally, in step S20, a light emitting layer 32 and a reflective layer 7 are formed on a side of the planarization layer 2 away from the substrate 1, and thereafter, the preparation method further comprises:

[0132] Step S30 , forming a first encapsulation layer 61 on a side of the light-emitting layer 32 away from the substrate 1 ; the first encapsulation layer 61 covers the light-emitting layer 32 .

[0133] Optionally, in step S30, a first encapsulation layer 61 is formed on a side of the light emitting layer 32 away from the substrate 1, and thereafter, the preparation method further comprises:

[0134] Step S40, forming a first light-transmitting layer 51 and a second light-transmitting layer 52 on the side of the first encapsulation layer 61 away from the substrate 1; wherein the first light-transmitting layer 51 fills the pixel opening 20 and at least covers the slope portion 203; the second light-transmitting layer 52 is arranged on the side of the first light-transmitting layer 51 away from the substrate 1, and the refractive index of the second light-transmitting layer 52 is less than the refractive index of the first light-transmitting layer 51.

[0135] Optionally, step S20 forms a light-emitting layer 32 and a reflective layer 7 on a side of the planarization layer 2 away from the substrate 1, including: manufacturing a first electrode 31 and a reflective layer 7 on the same layer, wherein the reflective layer 7 is located on the outer peripheral side of the first electrode 31 and covers the slope portion 203; forming an insulating layer 4 on a side of the reflective layer 7 away from the substrate 1, wherein the insulating layer 4 is disconnected at the pixel opening 20; forming a light-emitting layer 32 on a side of the first electrode 31 away from the substrate 1; referring to Fig. 9 , Fig.10 shown.

[0136] Alternatively, step S20 forms a light emitting layer 32 and a reflective layer 7 on the side of the planarization layer 2 away from the substrate 1, including: manufacturing the light emitting layer 32, forming the reflective layer 7 on the side of the light emitting layer 32 away from the substrate 1, and the reflective layer 7 is disconnected at the pixel opening 20; Fig.11 , Fig.12 shown.

[0137] Another embodiment of the present application provides a display device, which includes the display panel in the above embodiment. The display device can be a smart device (such as a mobile phone, VR device, computer, TV, car display, etc.).

[0138] The display device provided in this embodiment has a display panel 100 that can reflect part of the light emitted by the light-emitting layer 32 by setting a reflective layer 7 on the slope portion 203, especially can reflect light with a larger incident angle and emit it at a smaller angle, thereby changing the propagation path and the emission angle of the light, so that more light can be emitted from the display panel 100, which can improve the light extraction efficiency and enhance the optical performance.

[0139] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0140] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0141] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; A planarization layer is disposed on one side of the substrate, and a pixel opening is opened in the planarization layer; the pixel opening includes a bottom wall and a side wall, and the side wall includes a slope portion; A light-emitting layer is disposed on a side of the planarization layer away from the substrate, wherein at least a portion of the light-emitting layer is located in the pixel opening; The reflective layer is arranged on a side of the planarization layer away from the substrate, and an orthographic projection of the reflective layer on the substrate at least partially overlaps with an orthographic projection of the slope portion on the substrate.

2. The display panel according to claim 1, wherein: The display panel further includes: A reflective structure is arranged on a side of the reflective layer away from the substrate, and an orthographic projection of the slope portion on the substrate is located within an orthographic projection of the reflective structure on the substrate; Preferably, an orthographic projection of the slope portion on the substrate is located within an orthographic projection of the reflective layer on the substrate.

3. The display panel according to claim 2, wherein: The reflective structure comprises: A first light-transmitting layer is disposed on a side of the light-emitting layer away from the substrate, the first light-transmitting layer fills the pixel opening and at least covers the slope portion; A second light-transmitting layer is disposed on a side of the first light-transmitting layer away from the substrate, and a refractive index of the second light-transmitting layer is smaller than a refractive index of the first light-transmitting layer; Preferably, the distance between the surface of the first light-transmitting layer away from the substrate and the bottom wall is greater than the depth of the pixel opening; Preferably, the first light-transmitting layer comprises a heat-curable optical adhesive; Preferably, the refractive index of the second light-transmitting layer is 1-1.5; Preferably, the second light-transmitting layer comprises a hollow silicon dioxide layer; Preferably, the second light-transmitting layer comprises a lithium fluoride layer; Preferably, the second light-transmitting layer comprises an organic material layer having a porous structure.

4. The display panel according to claim 1, wherein: The planarization layer includes a first planarization portion and a second planarization portion; In a direction perpendicular to the substrate, the thickness of the first planarized portion is smaller than the thickness of the second planarized portion, and an orthographic projection of the second planarized portion on the substrate is located on an outer peripheral side of an orthographic projection of the first planarized portion on the substrate; Preferably, the bottom wall is located on a surface of the first planarized portion away from the substrate, and the side wall is located on a surface of the second planarized portion away from the substrate; Preferably, the angle formed by the slope and the plane where the bottom wall is located ranges from 20° to -55°； Preferably, the slope portion comprises an inclined surface or a curved surface; Preferably, an orthographic projection of an end portion of the pixel opening close to the substrate on the substrate is located within an orthographic projection of an end portion of the pixel opening far from the substrate on the substrate.

5. The display panel according to claim 1, wherein: The display panel comprises a first electrode, the first electrode is disposed between the substrate and the light emitting layer, and the first electrode is at least partially exposed to the pixel opening; The first electrode and the reflective layer are an integrated structure; Preferably, the orthographic projection of the reflective layer on the substrate is located on the outer peripheral side of the orthographic projection of the first electrode on the substrate; preferably, the orthographic projection of the reflective layer on the substrate is located within the orthographic projection of the light-emitting layer on the substrate; Preferably, the display panel comprises a second electrode, the second electrode is arranged on a side of the light-emitting layer away from the first electrode, and the second electrode, the light-emitting layer and the first electrode form a light-emitting unit; Preferably, the first electrodes of adjacent light-emitting units are arranged at intervals; Preferably, the first electrode comprises an anode, and the second electrode comprises a cathode; Preferably, the display panel comprises an insulating layer, the insulating layer is arranged between the reflective layer and the light-emitting layer, and the orthographic projection of the insulating layer on the substrate is located on the outer peripheral side of the orthographic projection of the bottom wall on the substrate; Preferably, the insulating layer comprises organic glue or inorganic material.

6. The display panel according to claim 1, wherein: The reflective layer is arranged on a side of the light-emitting layer away from the substrate, and the orthographic projection of the slope portion on the substrate is located within the orthographic projection of the reflective layer on the substrate; Preferably, the orthographic projection of the reflective layer on the substrate is located on the outer peripheral side of the orthographic projection of the bottom wall on the substrate.

7. The display panel according to claim 3, wherein: The display panel comprises a first encapsulation layer, wherein the first encapsulation layer is disposed between the light-emitting layer and the first light-transmitting layer, and an orthographic projection of the light-emitting layer on the substrate is located within an orthographic projection of the first encapsulation layer on the substrate; Preferably, the display panel further comprises a second encapsulation layer, wherein the second encapsulation layer is located on a side of the first encapsulation layer away from the substrate; Preferably, the second light-transmitting layer includes the second encapsulation layer; Preferably, the display panel further comprises a third encapsulation layer, and the third encapsulation layer is located on a side of the second encapsulation layer away from the substrate; Preferably, the refractive index of the first light-transmitting layer is greater than or equal to the refractive index of the first encapsulation layer.

8. A method for preparing a display panel, characterized in that: The method comprises: Forming a planarization layer on one side of the substrate, and forming a pixel opening in the planarization layer; wherein the pixel opening comprises a bottom wall and a side wall, and the side wall comprises a slope portion; A light-emitting layer and a reflective layer are formed on a side of the planarization layer away from the substrate; wherein the light-emitting layer is at least partially located in the pixel opening, and the orthographic projection of the reflective layer on the substrate at least partially overlaps with the orthographic projection of the slope portion on the substrate.

9. The method for preparing a display panel according to claim 8, wherein: The step of forming a planarization layer on one side of the substrate and forming a pixel opening in the planarization layer comprises: The planarization layer is pattern-exposed and opened by a half-tone process to form a first planarization portion and a second planarization portion; wherein the thickness of the first planarization portion is less than the thickness of the second planarization portion, and a portion of the second planarization portion that is higher than the first planarization portion is enclosed with the first planarization portion to form the pixel opening; Preferably, after the step of forming a light-emitting layer and a reflective layer on a side of the planarization layer away from the substrate, the preparation method further comprises: forming a first encapsulation layer on a side of the light-emitting layer away from the substrate; Preferably, after the step of forming a first encapsulation layer on a side of the light-emitting layer away from the substrate, the preparation method further comprises: A first light-transmitting layer and a second light-transmitting layer are formed on a side of the first encapsulation layer away from the substrate; wherein the first light-transmitting layer fills the pixel opening and at least covers the slope portion; the second light-transmitting layer is disposed on a side of the first light-transmitting layer away from the substrate, and the refractive index of the second light-transmitting layer is less than the refractive index of the first light-transmitting layer; Preferably, the step of forming a light-emitting layer and a reflective layer on a side of the planarization layer away from the substrate comprises: manufacturing a first electrode and the reflective layer on the same layer, wherein the reflective layer is located on the outer peripheral side of the first electrode and covers the slope portion; forming an insulating layer on a side of the reflective layer away from the substrate, wherein the insulating layer is disconnected at the pixel opening; and forming the light-emitting layer on a side of the first electrode away from the substrate. Preferably, the step of forming a light-emitting layer and a reflective layer on a side of the planarization layer away from the substrate comprises: manufacturing a light-emitting layer, forming the reflective layer on a side of the light-emitting layer away from the substrate, wherein the reflective layer is disconnected at the pixel opening.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 7, or a display panel prepared by the method for preparing a display panel according to claim 8 or 9.

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