Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises a substrate, a pixel definition layer, a light-emitting element, a reflecting part and a light extraction layer, wherein the pixel definition layer is arranged on one side of the substrate and is provided with a first pixel opening; at least part of the light-emitting element is formed in the first pixel opening; the reflecting part is at least formed on the side wall of the first pixel opening and is used for reflecting light emitted by the light-emitting element; the light extraction layer comprises a light extraction unit arranged in the light emitting direction of the light emitting element, the light extraction unit comprises a convex part, and the convex part is used for receiving the light reflected by the reflecting part and adjusting the light emitting direction. The display panel can improve the light emitting efficiency of the positive visual angle and reduce the power consumption.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode), also known as organic electroluminescence display or organic light-emitting semiconductor (Organic Electroluminescence Display, OLED), is a current-type organic light-emitting device that emits light through the injection and recombination of carriers.

[0003] Currently, OLED is a hot topic in current research, but its display quality needs to be further improved. Summary of the invention

[0004] The present application mainly provides a display panel and a display device, which can improve the light output efficiency at a normal viewing angle and reduce power consumption.

[0005] In order to solve the above technical problems, the technical solution adopted in the present application is: to provide a display panel, which includes a substrate, a pixel definition layer, a light-emitting element, a reflective member and a light extraction layer; wherein the pixel definition layer is arranged on one side of the substrate, and is provided with a first pixel opening; at least part of the light-emitting element is formed in the first pixel opening; the reflective member is formed at least on the side wall of the first pixel opening, and is used to reflect the light emitted by the light-emitting element; the light extraction layer includes a light extraction unit arranged in the light emitting direction of the light-emitting element, and the light extraction unit includes a convex portion, and the convex portion is used to receive the light reflected by the reflective member and adjust the light emission direction.

[0006] Wherein, the reflective element further extends from the side wall of the first pixel opening to the bottom wall of the first pixel opening.

[0007] Preferably, the reflective element further extends from the sidewall of the first pixel opening to a side of the pixel definition layer facing away from the substrate.

[0008] Among them, the light-emitting element includes a first electrode, a light-emitting material layer and a second electrode stacked in sequence in a direction away from the substrate; the material of the reflective member includes a conductive material, wherein the reflective member extending to the bottom wall of the first pixel opening is located between the first electrode and the light-emitting material layer, and is electrically connected to the first electrode.

[0009] Preferably, the material of the reflective element is the same as that of the first electrode.

[0010] Preferably, the first electrode is an anode.

[0011] Among them, the light-emitting element includes a first electrode, a light-emitting material layer, and a second electrode that are sequentially stacked in a direction away from the substrate, and the reflecting member is reused as the first electrode.

[0012] Preferably, the first electrode is an anode.

[0013] Among them, the display panel further includes an insulating layer, which is disposed between the reflecting member outside the bottom wall of the first pixel opening and the light-emitting material layer outside the bottom wall of the first pixel opening.

[0014] Preferably, the refractive index range of the insulating layer is 1.35 - 1.7.

[0015] Among them, the material of the insulating layer is the same as the material of the pixel defining layer.

[0016] Preferably, the material of the insulating layer / the pixel defining layer includes at least one of silicon oxide, silicon nitride, silicon oxynitride, and organic glue.

[0017] Among them, in a direction away from the light-emitting element, the orthographic projection of the reflecting member on the substrate protrudes relative to the orthographic projection of the convex portion on the substrate.

[0018] Preferably, the convex portion has an annular structure, and the light extraction unit further includes a flat portion, and the convex portion is disposed around the flat portion.

[0019] Preferably, the width of the convex portion is less than 1 micron.

[0020] Preferably, the material of the light extraction layer includes at least one of silicon nitride and silicon oxynitride.

[0021] Among them, the display panel further includes a packaging layer, which is disposed on a side of the light extraction layer away from the substrate.

[0022] Preferably, the refractive indices of the reflecting member and the light extraction layer are less than the refractive index of the packaging layer.

[0023] Preferably, the refractive index range of the light extraction layer is 1.35 - 1.7.

[0024] Among them, the number of the first pixel openings is multiple, and the number of the light extraction units is multiple, and different light extraction units are correspondingly disposed for different first pixel openings.

[0025] Preferably, the display panel further includes spacer posts, which are disposed on a side of the pixel defining layer away from the substrate and are located between two adjacent light extraction units.

[0026] To solve the above technical problems, another technical solution adopted in this application is: to provide a display device, which includes the display panel in the above embodiment.

[0027] The beneficial effects of this application are as follows: In this application, a reflector is formed at least on the side wall of the first pixel opening. When the light-emitting element emits light, when the emitted light hits the side wall of the first pixel opening, it will be reflected by the reflector, reducing light loss and improving the light extraction efficiency. In this application, a light extraction layer is also provided. The light extraction layer includes light extraction units arranged in the light-emitting direction of the light-emitting element. The orthographic projection of the light extraction units on the substrate covers the orthographic projection of the first pixel opening on the substrate, so that the light emitted by the light-emitting element will pass through the light extraction units and be emitted. The light extraction unit includes a convex portion. After the light reflected by the reflector passes through the convex portion, the emission direction will be changed, causing the light to converge towards the middle of the light extraction unit, improving the light extraction efficiency at the positive viewing angle, improving the display effect of the display panel, and reducing power consumption. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0029] Figure 1 It is a schematic structural diagram of an embodiment of the display panel in this application;

[0030] Figure 2 It is a schematic structural diagram of another embodiment of the display panel in this application;

[0031] Figure 3 It is a schematic structural diagram of another embodiment of the display panel in this application;

[0032] Figure 4 For Figure 3 It is a schematic structural diagram of an embodiment of the light extraction method of the display panel in

[0033] Figure 5 It is a schematic structural diagram of another embodiment of the display panel in this application.

[0034] Description of the reference numerals: 100 display panel; 10 substrate; 20 pixel definition layer; 21 first pixel opening; 22 side wall; 23 bottom wall; 30 light-emitting element; 31 first electrode; 32 light-emitting material layer; 33 second electrode; 34 protective layer; 40 reflector; 50 light extraction layer; 51 light extraction unit; 52 convex portion; 53 flat portion; 60 insulating layer; 70 encapsulation layer; 80 isolation column. Detailed Embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0038] Referring to

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0040] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, this application provides a display panel 100, which includes a substrate 10, a pixel definition layer 20, a light-emitting element 30, a reflector 40, and a light extraction layer 50; wherein, the pixel definition layer 20 is disposed on one side of the substrate 10 and is provided with a first pixel opening 21; at least a part of the light-emitting element 30 is formed in the first pixel opening 21; the reflector 40 is at least formed on the sidewall 22 of the first pixel opening 21 for reflecting the light emitted by the light-emitting element 30; the light extraction layer 50 includes a light extraction unit 51 disposed in the light-emitting direction of the light-emitting element 30, and the light extraction unit 51 includes a convex portion 52 for receiving the light reflected by the reflector 40 and adjusting the light-emitting direction of the light.

[0041] Specifically, the substrate 10 plays a supporting role in the display panel 100. It can be a flexible substrate or a rigid substrate. When the substrate 10 is a flexible substrate, its material can be polyimide. When the substrate 10 is a rigid substrate, its material can be glass or metal. The substrate 10 can be a single-layer or multi-layer structure, and this application does not limit the specific structure of the substrate 10.

[0042] Among them, the main function of the pixel definition layer 20 is to define and limit the shape and size of the pixels to ensure that each pixel can work correctly. Specifically, the setting of the first pixel opening 21 in the pixel definition layer 20 can achieve the precise alignment and positioning of the pixels, ensure the isolation between the pixels, and prevent crosstalk. Among them, in this application, the reflector 40 is at least formed on the sidewall 22 of the first pixel opening 21. When the light-emitting element 30 emits light, when the emitted light reaches the sidewall 22 of the first pixel opening 21, it will be reflected by the reflector 40, reducing light loss and improving the light extraction efficiency. In this application, the light extraction layer 50 is also provided. The light extraction layer 50 includes a light extraction unit 51 disposed in the light-emitting direction of the light-emitting element 30. The orthographic projection of the light extraction unit 51 on the substrate 10 covers the orthographic projection of the first pixel opening 21 on the substrate 10, so that the light emitted by the light-emitting element 30 will pass through the light extraction unit 51 and be emitted. The light extraction unit 51 includes a convex portion 52. After the light reflected by the reflector 40 passes through the convex portion 52, the light-emitting direction will be changed, causing the light to converge towards the middle of the light extraction unit 51, improving the light extraction efficiency of the positive viewing angle, improving the display effect of the display panel 100, and reducing power consumption.

[0043] Please continue to refer to Figure 2 , the reflector 40 further extends from the sidewall 22 of the first pixel opening 21 to the bottom wall 23 of the first pixel opening 21 to form a reflective cup structure. Specifically, the reflector 40 covers the bottom wall 23 and the sidewall 22 of the first pixel opening 21, which can reduce the preparation difficulty of the reflector 40. At the same time, the reflector 40 is cup-shaped, thus forming a reflective cup structure, which can improve the light transmittance and enhance the optical performance of the display panel 100.

[0044] Continue to refer to Figure 2 In one embodiment, the reflective member 40 further extends from the sidewall 22 of the first pixel opening 21 to the side of the pixel defining layer 20 away from the substrate 10. In an application scenario, the length of the reflective member 40 extending on the surface of the pixel defining layer 20 away from the substrate 10 is less than 1 micron to avoid the optical waveguide from affecting the light emission and achieve a better display effect.

[0045] Please continue to refer to Figure 2 The light-emitting element 30 includes a first electrode 31, a light-emitting material layer 32, and a second electrode 33 that are sequentially stacked in a direction away from the substrate 10; the material of the reflective member 40 includes a conductive material. Among them, the reflective member 40 extending to the bottom wall 23 of the first pixel opening 21 is located between the first electrode 31 and the light-emitting material layer 32 and is electrically connected to the first electrode 31. Specifically, in the light-emitting element 30, by supplying power to the first electrode 31 and the second electrode 33, the light-emitting material emits light. The material of the reflective member 40 includes a conductive material, which can be a metal; specifically, the material of the reflective member 40 can include at least one of molybdenum (Mo), titanium (Ti), aluminum (Al), copper (Au), silver (Ag), indium tin oxide (ITO), and indium zinc oxide (IZO). In the direction away from the substrate 10 of the light-emitting element 30, the first electrode 31, the reflective member 40, and the light-emitting material layer 32 are sequentially stacked. Since the reflective member 40 can conduct electricity, the electrical connection between the first electrode 31 and the light-emitting material layer 32 can be achieved.

[0046] In one embodiment, the material of the reflective member 40 is the same as the material of the first electrode 31. Specifically, the reflective member 40 and the first electrode 31 are prepared from the same material, which can simplify the preparation steps and improve the preparation efficiency.

[0047] In one embodiment, the first electrode 31 is an anode and the second electrode 33 is a cathode. The first electrode 31 includes a transparent conductive material, and the transparent conductive material can include at least one of materials such as indium tin oxide (Indium-Tin Oxide, ITO), indium zinc oxide (Indium Zinc Oxide, IZO), aluminum-doped zinc oxide (Aluminum-doped Zinc Oxide, AZO), indium gallium oxide (Indium Gallium Oxide, IGO), indium gallium zinc oxide (Indium Gallium Zinc Oxide, IGZO), indium-tin-zinc oxide (Indium-Tin-Zinc Oxide, ITZO), indium gallium tin oxide (Indim Gallium Tin Oxide, IGTO), and zinc oxide (ZnO).

[0048] In one embodiment, a protective layer 34 is further included on the side of the second electrode 33 away from the substrate 10 to protect the surface of the second electrode 33 on the side away from the substrate 10.

[0049] In the above embodiment, the reflector 40 and the first electrode 31 are two different structures. However, in other embodiments, referring to Figure 3 , at this time, the reflector 40 can also be reused as the first electrode 31, so that the structure of the display panel 100 can be simplified and the manufacturing efficiency can be improved. At this time, the reflector 40 is made of a transparent conductive material.

[0050] Please continue to refer to Figure 1 , Figure 2 and Figure 3 , the display panel 100 further includes an insulating layer 60 disposed between the reflector 40 outside the bottom wall 23 of the first pixel opening 21 and the light-emitting material layer 32 outside the bottom wall 23 of the first pixel opening 21. Specifically, considering that if the light-emitting material layer 32 outside the bottom wall 23 of the first pixel opening 21 emits light, it may cause crosstalk of light emitted by two adjacent light-emitting elements 30, and the light-emitting material layer 32 outside the bottom wall 23 of the first pixel opening 21 is prone to uneven deposition. Therefore, allowing the light-emitting material layer 32 outside the bottom wall 23 of the first pixel opening 21 to emit light will also cause uneven display of the display panel 100. The setting of the insulating layer 60 can prevent the light-emitting material layer 32 outside the bottom wall 23 of the first pixel opening 21 from being electrically connected to the reflector 40, thereby preventing the light-emitting material layer 32 outside the bottom wall 23 of the first pixel opening 21 from emitting light, and thus avoiding the above defects.

[0051] In one embodiment, the refractive index range of the insulating layer 60 is 1.35 - 1.7. Specifically, the refractive index of the insulating layer 60 can be 1.35, 1.4, 1.5, 1.6 or 1.7.

[0052] In one embodiment, the material of the insulating layer 60 is the same as that of the pixel defining layer 20. Using the same material to prepare the insulating layer 60 and the pixel defining layer 20 can save the manufacturing process and improve the manufacturing efficiency.

[0053] In one embodiment, the material of the insulating layer 60 / pixel defining layer 20 includes at least one of silicon oxide, silicon nitride, silicon oxynitride, organic glue, and organic resin. Among them, the organic glue materials include polyimide (PI), polyamide, benzocyclobutene (BCB), acrylic resin or phenolic resin, etc., and the organic resin materials include hexamethyldisiloxane, epoxy resin or polyimide (Polyimide, PI), etc.

[0054] Please continue to refer to Figure 1 ,Figure 2 or Figure 3 In the direction away from the light-emitting element 30, the orthographic projection of the reflector 40 on the substrate 10 protrudes relative to the orthographic projection of the convex portion 52 on the substrate 10. Specifically, the length of the reflector 40 or the first electrode 31 located in the first pixel opening 21 is W1, and the distance between the highest points between the two convex portions 52 is also W1, that is, the length of the reflector 40 or the first electrode 31 located in the first pixel opening 21 is the same as the distance between the highest points between the two convex portions 52. Of course, in other embodiments, the length of the reflector 40 or the first electrode 31 located in the first pixel opening 21 and the distance between the highest points between the two convex portions 52 may also be different. At the same time, in the direction parallel to the extension of the substrate 10, the reflector 40 protrudes from the convex portion 52, so that the light reflected by the reflector 40 can be refracted out through the convex portion 52 to a greater extent, avoiding the dissipation of light in the convex portion 52, thereby improving the light-emitting efficiency.

[0055] In one embodiment, the convex portion 52 has an annular structure, and the light extraction unit 51 further includes a flat portion 53, and the convex portion 52 is disposed around the flat portion 53. Specifically, since the flat portion 53 is located in the middle region, the convex portion 52 is disposed around the flat portion 53.

[0056] In one embodiment, the width W2 of the convex portion 52 is less than 1 micron. By limiting the width of the convex portion 52, the need for light to exit from the front view angle can be met, and the display effect can be improved.

[0057] In one embodiment, the material of the light extraction layer 50 includes at least one of silicon nitride and silicon oxynitride. The silicon nitride or silicon oxynitride material is easy to obtain, which is beneficial to the preparation of the light extraction layer.

[0058] Please refer to Figure 5 , the display panel 100 further includes a packaging layer 70, which is disposed on the side of the light extraction layer 50 away from the substrate 10. The design of the packaging layer 70 can prevent water vapor from entering the light-emitting material layer 32 and affecting the service life of the light-emitting element 30.

[0059] In one embodiment, the refractive indices of the reflector 40 and the light extraction layer 50 are less than the refractive index of the packaging layer 70. Specifically, by making the refractive index of the packaging layer 70 greater than the refractive indices of the reflector 40 and the light extraction layer 50, the refractive index of the film layer through which the outgoing light passes gradually increases, so that the outgoing light approaches the normal line after refraction, thereby concentrating the light in the light-emitting direction and improving the front view light-emitting efficiency.

[0060] In one embodiment, the refractive index range of the light extraction layer 50 is 1.35 - 1.7. Specifically, the refractive index of the insulating layer 60 can be 1.35, 1.4, 1.5, 1.6, or 1.7. At the same time, the refractive index of the insulating layer 60 is less than that of the light extraction layer 50, and the refractive index of the light extraction layer 50 is less than that of the encapsulation layer 70.

[0061] In one embodiment, the number of the first pixel openings 21 is multiple, and the number of the light extraction units 51 is multiple. Different light extraction units 51 are arranged corresponding to different first pixel openings 21. The light extraction units 51 and the first pixel openings 21 are arranged corresponding to each other to improve the light extraction efficiency of the display panel 100.

[0062] Please continue to refer to Figure 5 , in another embodiment, the display panel 100 further includes spacer posts 80, which are arranged on the side of the pixel definition layer 20 away from the substrate 10 and are located between two adjacent light extraction units 51. Specifically, the arrangement of the spacer posts 80 can prevent light crosstalk between light-emitting units of different colors and improve the display effect.

[0063] This application also provides a display device, which includes the display panel 100 in the above embodiment. The display device in the embodiments of the present invention can be any product or component with a display function, such as an electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, or a navigator.

[0064] The above are only the embodiments of this application, and do not limit the patent scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of this application.

Claims

1. A display panel, characterized in that: include: substrate; A pixel definition layer, disposed on one side of the substrate, and having a first pixel opening; a light emitting element, at least partially formed in the first pixel opening; a reflector, formed at least on a side wall of the first pixel opening, for reflecting light emitted by the light emitting element; The light extraction layer comprises a light extraction unit arranged in the light emitting direction of the light emitting element, wherein the light extraction unit comprises a convex portion, and the convex portion is used to receive the light reflected by the reflector and adjust the emitting direction of the light.

2. The display panel according to claim 1, characterized in that: The reflective member further extends from the side wall of the first pixel opening to the bottom wall of the first pixel opening; Preferably, the reflective element further extends from the sidewall of the first pixel opening to a side of the pixel definition layer facing away from the substrate.

3. The display panel according to claim 2, characterized in that: The light-emitting element comprises a first electrode, a light-emitting material layer and a second electrode which are sequentially stacked in a direction away from the substrate; The material of the reflective member includes a conductive material, wherein the reflective member extending to the bottom wall of the first pixel opening is located between the first electrode and the light-emitting material layer, and is electrically connected to the first electrode; Preferably, the material of the reflector is the same as that of the first electrode; Preferably, the first electrode is an anode.

4. The display panel according to claim 2, characterized in that: The light-emitting element comprises a first electrode, a light-emitting material layer and a second electrode which are sequentially stacked in a direction away from the substrate, and the reflector is reused as the first electrode; Preferably, the first electrode is an anode.

5. The display panel according to claim 3 or 4, characterized in that: The display panel further comprises: an insulating layer, disposed between the reflective member located outside the bottom wall of the first pixel opening and the light emitting material layer located outside the bottom wall of the first pixel opening; Preferably, the refractive index of the insulating layer is in the range of 1.35-1.

7.

6. The display panel according to claim 5, characterized in that: The material of the insulating layer is the same as that of the pixel definition layer; Preferably, the material of the insulating layer / the pixel definition layer includes at least one of silicon oxide, silicon nitride, silicon oxynitride, and organic glue.

7. The display panel according to claim 1, characterized in that: In a direction away from the light-emitting element, an orthographic projection of the reflector on the substrate protrudes relative to an orthographic projection of the convex portion on the substrate; Preferably, the convex portion is annular in structure, the light extraction unit further comprises a flat portion, and the convex portion is arranged around the flat portion; Preferably, the width of the protrusion is less than 1 micron; Preferably, the material of the light extraction layer includes at least one of silicon nitride and silicon oxynitride.

8. The display panel according to claim 1, characterized in that: The display panel further comprises: An encapsulation layer is arranged on a side of the light extraction layer away from the substrate; Preferably, the refractive index of the reflector and the light extraction layer is smaller than the refractive index of the encapsulation layer; Preferably, the refractive index of the light extraction layer is in the range of 1.35-1.

7.

9. The display panel according to claim 1, characterized in that: The number of the first pixel openings is multiple, the number of the light extraction units is multiple, and different light extraction units are arranged corresponding to different first pixel openings; Preferably, the display panel further comprises: an isolation column, which is arranged on a side of the pixel definition layer away from the substrate and is located between two adjacent light extraction units.

10. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 9.

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