Display panel

Abstract

To provide a display panel, a display module, and a display device that improve light emission effect and efficiency.SOLUTION: A display panel includes a substrate 10, a light-emitting device layer 20, a light extraction film group layer 30, and a package structure 31 that are stacked. The light emitting device layer 30 is provided on a side of the substrate, the light extraction film group layer is provided on a side of the light emitting device layer opposite to the substrate, the light extraction film group layer includes at least two light extraction layers provided in a stacked manner, the at least two light extraction layers include a main extraction layer 31 and at least one layer of sub-extraction layer 32, the sub-extraction layer 32 is provided on one side or an opposite both sides of the main extraction layer 31, and a refractive index of the main extraction layer 31 is greater than that of the sub-extraction layer 32.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application relates to the field of display technology, and particularly to display panels.

Background Art

[0002] The display of organic light-emitting diodes (OLEDs) has advantages such as low cost, wide viewing angle, low driving voltage, fast response speed, rich emission colors, simple manufacturing process, and the ability to achieve large-area flexible displays, and is regarded as one of the most promising display technologies. However, this display technology still has room for improvement.

Summary of the Invention

[0003] Embodiments of this application provide a display panel.

[0004] In a first aspect, embodiments of this application include a substrate, a light-emitting device layer provided on one side of the substrate, and at least two light extraction layers provided on the side of the light-emitting device layer facing away from the substrate and stacked. The at least two light extraction layers include a main extraction layer and at least one sub-extraction layer. The sub-extraction layer is provided on one side or both opposite sides of the main extraction layer. A light extraction film group layer in which the refractive index of the main extraction layer is greater than the refractive index of the sub-extraction layer, and a package structure provided on the side of the light extraction film group layer facing away from the substrate, and provide a display panel comprising the same.

[0005] According to an embodiment of the first aspect of this application, the sub-extraction layer includes at least one first sub-extraction layer. The at least one first sub-extraction layer is provided on the side of the main extraction layer facing the substrate, and the refractive index of the package structure is smaller than the refractive index of the main extraction layer.

[0006] Optionally, the package structure is provided on the surface of the light extraction film group layer.

[0007] Optionally, the refractive index n2 of the main extraction layer is 1.7 to 2.6, and / or the refractive index of the package structure is 1.4 to 2.0.

[0008] Optionally, the refractive index n1 of the first sub-extraction layer is 1.2 to 1.6.

[0009] Optionally, for any two of at least two light extraction layers, the difference Δn1 in the refractive indices of the two light extraction layers is greater than 0.5 and less than 1.4.

[0010] Optionally, the thickness of the main extraction layer is greater than the thickness of the first sub-extraction layer.

[0011] Optionally, the thickness range of the first sub-extraction layer is 5 nm < d1 < 40 nm, and the thickness range of the main extraction layer is 20 nm < d2 < 70 nm.

[0012] Optionally, the total thickness of the light extraction film group layer is 50 nm < D1 = d1 + d2 < 110 nm.

[0013] According to the embodiment of the first aspect of the present application, the package structure includes at least two package layers provided in a stacked manner. The at least two package layers include a main package layer and at least one sub-package layer. The at least one sub-package layer is provided on one side or both opposite sides of the main package layer, and the refractive index of the main package layer is smaller than the refractive index of the sub-package layer.

[0014] Optionally, the at least one sub-package layer includes at least one first sub-package layer and at least one second sub-package layer. The at least one first sub-package layer and the at least one second sub-package layer are provided on both opposite sides of the main package layer. The refractive index n4 of the first sub-package layer is 1.4 to 2.0, the refractive index n5 of the main package layer is 1.4 to 1.6, and the refractive index n6 of the second sub-package layer is 1.4 to 2.0.

[0015] Selectively, at least one subpackage layer is provided on opposite sides of the main package layer, and the refractive indices of the subpackage layers located on opposite sides of the main package layer are the same.

[0016] Selectively, the number of sub-package layers provided on one side of the main package layer may be multiple, and the refractive index of the multiple sub-package layers gradually increases in the direction from the main package layer to the sub-package layers.

[0017] According to an embodiment of the first aspect of this application, if the refractive index difference Δn2(n4-n5 or n6-n5) < 0.2 between any two package layers in at least two package layers, then the refractive index difference between the main extraction layer and the first sub-package layer is 0.6 < Δn3(n2-n4) < 1.2, and n2 is selectably between 2.2 and 2.6.

[0018] According to an embodiment of the first aspect of this application, the refractive index of the first sub-extraction layer is smaller than the refractive index of the first sub-package layer.

[0019] Selectively, n1 is 1.4 to 1.6, n2 is 2.0 to 2.4, n4 is 1.7 to 2.0, n5 is 1.4 to 1.6, and n6 is 1.7 to 2.0, and the difference between the refractive index of the main extraction layer and the refractive index of the first subpackage layer is 0 ≤ Δn4(n2-n4) < 0.5.

[0020] According to an embodiment of the first aspect of this application, the sub-extraction layer includes at least one first sub-extraction layer, the at least one first sub-extraction layer is provided on the substrate-facing side of the main extraction layer, the sub-extraction layer further includes at least one second sub-extraction layer, the at least one second sub-extraction layer is located on the substrate-backward side of the main extraction layer, and the refractive index of the second sub-extraction layer is smaller than the refractive index of the package structure.

[0021] Optionally, the refractive index n1 of the first sub-extraction layer is 1.2 to 1.6, the refractive index n2 of the main extraction layer is 1.7 to 2.6, and the refractive index n3 of the second sub-extraction layer is 1.2 to 1.6.

[0022] According to an embodiment of the first aspect of the present application, the package structure includes at least two package layers provided in a stacked manner. The at least two package layers include a main package layer and at least one sub-package layer. The at least one sub-package layer includes at least one first sub-package layer and at least one second sub-package layer. The at least one first sub-package layer and the at least one second sub-package layer are provided on both opposite sides of the main package layer. The refractive index of the main package layer is smaller than the refractive index of the sub-package layer, and the refractive index of the second sub-extraction layer is smaller than the refractive index of the first sub-package layer.

[0023] Optionally, the refractive index n4 of the first sub-package layer is 1.4 to 2.0, the refractive index n5 of the main package layer is 1.4 to 1.6, and the refractive index n6 of the second sub-package layer is 1.4 to 2.0.

[0024] Optionally, the thickness range of the first sub-extraction layer is 0 < d1 < 40 nm, the thickness range of the main extraction layer is 30 nm < d2 < 70 nm, and the thickness range of the second sub-extraction layer is 20 nm < d3 < 50 nm.

[0025] Optionally, the total thickness of the light extraction film group layer is 70 nm < D2 = d1 + d2 + d3 < 160 nm.

[0026] Optionally, the refractive index difference between any two of the at least two light extraction layers is 0.5 < Δn5 (n2 - n1 or n2 - n3) < 1.4.

[0027] Optionally, n3 is 1.4 to 1.6, n4 is 1.8 to 2.0, n5 is 1.4 to 1.6, and n6 is 1.8 to 2.0.

[0028] Optionally, when the refractive index difference between any two of at least two package layers is Δn6 (n4 - n5 or n6 - n5) < 0.4, the refractive index difference between the first sub-package layer and the second sub-extraction layer is 0 ≤ Δn7 (n4 - n3) < 0.5.

[0029] According to an embodiment of the first aspect of the present application, the light-emitting device layer includes a plurality of light-emitting units, and the orthographic projection of each of the light-emitting units on the substrate is located within the orthographic projection area of the light extraction film group layer on the substrate.

[0030] Alternatively, the light-emitting device layer includes a light-emitting unit of a first color and a light-emitting unit of a second color. The orthographic projection of the light-emitting unit of the first color on the substrate is all located within the orthographic projection area of the light extraction film group layer on the substrate, and the orthographic projection of the light-emitting unit of the second color on the substrate is all located outside the orthographic projection area of the light extraction film group layer on the substrate. <{

[0031] Optionally, the first color is blue, and the second color is red or green.

[0032] In the second aspect, an embodiment of the present application provides a display module including the above display panel.

[0033] In the third aspect, an embodiment of the present application provides a display device including the above display panel or the above display module.

[0034] The present application has at least the following technical effects compared with the prior art.

[0035] In the display panel according to the present application, a light extraction film group layer and a package structure are designed above the light-emitting device layer. The light extraction film group layer is designed with a multi-layer structure, and by combining the refractive indices of at least two light extraction layers, the effect of improving the light output effect and efficiency is achieved.

Brief Description of the Drawings

[0036] The features, advantages, and technical effects of exemplary embodiments of this application will be described below with reference to the drawings.

[0037] [Figure 1] This is a schematic diagram of the structure of the display panel in an embodiment of this application. [Figure 2] This is a schematic diagram of the structure of another display panel according to the embodiment of this application. [Figure 3] This is a schematic diagram of yet another display panel structure of an embodiment of the present application. [Figure 4] This is a schematic diagram of yet another display panel structure of an embodiment of the present application. [Figure 5] This is a schematic diagram of yet another display panel structure of an embodiment of the present application. [Modes for carrying out the invention]

[0038] The features and exemplary embodiments of each aspect of this application are described in detail below. Many specific details are provided in the following detailed description to provide a complete understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is solely for the purpose of providing a better understanding of this application by illustrating examples. At least some known structures and technologies are not illustrated in the drawings and the following description so as not to unnecessarily obscure this application. The size of some structures may be exaggerated for clarity. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0039] In the following description, the terms "direction" refer to the directions shown in the figures and do not limit the specific configuration of the array substrate and display panel of this application. In the description of this application, unless otherwise explicitly stated and limited, the terms "mounting" and "connection" should be understood in a broad sense, for example, meaning that a connection may be fixed, detachably connected, integrally connected, directly connected, or indirectly connected. Those skilled in the art will be able to understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0040] The display panel suffers from low light emission efficiency due to mismatch in refractive index of the film layer and energy loss at the interface between the electrode and the organic material.

[0041] In view of this, the embodiments of this application provide a display panel and a display device that can improve light emission efficiency. To better understand this application, each embodiment of the display panel and the display device will be described below with reference to the drawings.

[0042] The following describes, first, the display panel according to the embodiment of this application, and the display panel according to the embodiment of this application may be an OLED display panel.

[0043] In a first embodiment, the embodiment of the present application provides a display panel, as shown in Figures 1 to 3, the display panel comprises a substrate 10, a light-emitting device layer 20 provided on the substrate 10 side, at least two light extraction layers provided on the side of the light-emitting device layer 20 facing away from the substrate 10 and laminated, the at least two light extraction layers comprising a main extraction layer 31 and at least one sub-extraction layer, the sub-extraction layer provided on one side or both opposing sides of the main extraction layer 31, and a light extraction film group layer 30 in which the refractive index of the main extraction layer 31 is greater than the refractive index of the sub-extraction layer, and a package structure provided on the side of the light extraction film group layer facing away from the substrate.

[0044] In some embodiments, as shown in Figures 4 and 5, the substrate 10 may be a substrate having a certain circuit structure for driving a light-emitting device layer 20 located thereon to display light emission. Optionally, the substrate 10 may include a base and an array substrate, and the array substrate may include a drive circuit. For example, the array substrate may include a first conductive layer, a second conductive layer, and a third conductive layer, which are provided on one side of the base and arranged in layers. An insulating layer is provided between adjacent conductive layers. Exemplarily, a pixel drive circuit provided on the array substrate includes a transistor and a storage capacitor. The transistor includes a semiconductor, a gate electrode, a source electrode, and a drain electrode. The storage capacitor includes a first electrode and a second electrode. As an example, the gate electrode and the first electrode may be located in the first conductive layer, the second electrode in the second conductive layer, and the source electrode and drain electrode in the third conductive layer. The display panel further includes a pixel definition layer 24, which is provided on a substrate and includes a pixel limiting portion and a pixel aperture. A light-emitting structure 22 is provided within the pixel aperture to realize light-emitting display of the display panel. The substrate 10 can provide the display panel with functions such as buffering, protection, or support. The substrate 10 may be a flexible substrate 10, and its material may include one or more of the following: polyimide (PI), polyethylene naphthalate two formic acid glycol ester (PEN), or polyethylene terephthalate (PET). The substrate 10 may also be a rigid substrate 10, for example, a glass substrate 10.

[0045] The light-emitting device layer 20 is provided on the substrate 10 side, and the light-emitting device layer 20 can display light by driving an electrical signal, and the emitted light can pass through the light extraction film group layer 30 and the package structure 40.

[0046] The light-emitting device layer 20 may include a plurality of light-emitting units distributed in an array, and each light-emitting unit may include a second electrode layer 21, a light-emitting structure 22, and a first electrode layer 23 arranged in order from bottom to top, with the second electrode layer 21 being closer to the substrate 10 than the first electrode layer 23. In some embodiments, the refractive index of the light-emitting structure 22 is 1.8 to 2.1, i.e., refractive index = 1.8 to 2.1. Exemplarily, the refractive index of the light-emitting structure 22 is 1.8, 1.9, 2.0, or 2.1. Unless otherwise specified, the refractive index described herein refers to the refractive index of the material for light with a wavelength of 460 nm.

[0047] Selectively, the second electrode layer 21 may be an anode, the light-emitting structure 22 may be a layered structure made of an organic light-emitting material, and the first electrode layer 23 may be a cathode. The second electrode layer 21 can employ a three-layer laminated structure of a transparent conductive layer, a reflective conductive layer, and a transparent conductive layer having total internal reflection properties. The transparent conductive layer can be made of one or more materials selected from indium tin oxide (ITO), indium zinc oxide (IZO), and aluminum zinc oxide (AZO). The reflective conductive layer can be made of silver or copper. The first electrode layer 23 may be made of ITO. The second electrode layer 21 and the light-emitting structure 22 may be arranged in an array, and the first electrode layer 23 may be formed so that the entire layer covers each light-emitting structure 22, or it may be provided so as to be arranged in an array corresponding to each light-emitting structure 22. This application does not limit the specific structure of the first electrode layer 23. The light-emitting unit of this embodiment may include multiple colored light-emitting units, for example, a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit, and the different colored light-emitting units are arranged according to a predetermined rule, and this application does not limit the specific arrangement rule.

[0048] Continuing to refer to Figures 1 to 3, the light extraction film group layer 30 is provided on the side of the light-emitting device layer 20 that faces away from the substrate 10, and the light extraction film group layer 30 can cover and protect the light-emitting device layer 20 from above. The package structure 40 is provided on the side of the light extraction film group layer 30 that faces away from the substrate 10, and the package structure 40 can cover and protect the light extraction film group layer 30 and the light-emitting device layer 20 from above.

[0049] The cooperation between the light extraction film group layer 30 and the package structure 40 allows for adjustment of the optical interference distance, suppression of external light reflection, and improvement of light extraction efficiency.

[0050] The light extraction film group layer 30 includes at least two stacked light extraction layers, the at least two light extraction layers including a main extraction layer 31 and a sub-extraction layer 32. The sub-extraction layer 32 includes at least one layer, and the sub-extraction layer 32 is provided on one side or both opposing sides of the main extraction layer 31, with the refractive index of the main extraction layer 31 being greater than that of the sub-extraction layer 32. The at least two light extraction layers can increase the optical interference distance and improve the light extraction efficiency.

[0051] In some embodiments, the sub-extraction layer 32 includes at least one layer, and the refractive index of the sub-extraction layer 32 located on one side of the main extraction layer 31 gradually decreases in the direction from the main extraction layer 31 to the sub-extraction layer 32.

[0052] Exemplary, the sub-extraction layer 32 is provided on the side of the main extraction layer 31 facing the substrate 10, and the sub-extraction layer 32 includes multiple layers, and the refractive index of the multiple sub-extraction layers 32 provided on the side of the main extraction layer 31 facing the substrate 10 gradually decreases in the direction from the main extraction layer 31 to the sub-extraction layer 32.

[0053] Exemplary, the sub-extraction layer 32 is provided on the side of the main extraction layer 31 facing the substrate 10, and also on the side of the main extraction layer 31 facing away from the substrate 10. The sub-extraction layer 32 provided on the side of the main extraction layer 31 facing the substrate 10 includes multiple layers, and the refractive index of the multiple layers of the sub-extraction layer 32 provided on the side of the main extraction layer 31 facing the substrate 10 gradually decreases in the direction from the main extraction layer 31 to the sub-extraction layer 32. The sub-extraction layers 32 provided on opposite sides of the main extraction layer 31 each include multiple layers, and the sub-extraction layer 32 provided on the side of the main extraction layer 31 facing away from the substrate 10 includes multiple layers, and the refractive index of the multiple layers of the sub-extraction layer 32 provided on the side of the main extraction layer 31 facing away from the substrate 10 gradually decreases in the direction from the main extraction layer 31 to the sub-extraction layer 32. Referring to Figure 1, the direction of the arrow includes the direction from the main extraction layer 31 to the sub-extraction layer 32.

[0054] In some embodiments, the sub-extraction layer 32 provided on the side of the main extraction layer 31 facing the substrate 10 is at least two layers, and the sub-extraction layer 32 provided on the side of the main extraction layer 31 facing away from the substrate 10 is a single layer, or the sub-extraction layer 32 provided on the side of the main extraction layer 31 facing the substrate 10 is a single layer, and the sub-extraction layer 32 provided on the side of the main extraction layer 31 facing away from the substrate 10 is at least two layers.

[0055] In some embodiments, the material of the photo-extraction film group layer 30 is an organic material. Exemplarily, the material of the photo-extraction film group layer 30 includes polymer resins such as polyethersulfone (PES), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyimide (PI), polycarbonate (PC), triacetylcellulose (TAC), and cellulose acetate propionate (CAP). The photo-extraction film group layer 30 can be deposited using a single chamber, saving one deposition chamber compared to conventional optical structures. The materials of the multiple sub-extraction layers 32 may be the same, or they may be different.

[0056] In the display panel according to the embodiment of this application, a light extraction film group layer 30 and a package structure 40 are designed above the light-emitting device layer 20, the light extraction film group layer is designed as a multilayer structure, and by combining the refractive indices of at least two light extraction layers, the effect of improving light emission effect and efficiency is achieved.

[0057] Referring to Figure 2, in some embodiments, the sub-extraction layer 32 includes at least one first sub-extraction layer 321, the at least one first sub-extraction layer 321 is provided on the side of the main extraction layer 31 facing the substrate 10, and the refractive index of the package structure 40 is smaller than that of the main extraction layer 31.

[0058] According to the embodiment of this application, the refractive index of the first sub-extraction layer 321 is lower than that of the main extraction layer 31, and the refractive index of the main extraction layer 31 is higher than that of the package structure 40. A structure with low refractive index, high refractive index, and low refractive index can be formed above the light-emitting device layer 20, and a microcavity can be formed between it and the light-emitting device layer 20. The light emitted from the light-emitting device layer 20 is enhanced by the action of the microcavity, thereby improving the light emission efficiency.

[0059] In some embodiments, the package structure 40 is provided on the surface of the light extraction film group layer 30, and the package structure 40 provides protection to the light extraction film group layer 30, while also working in cooperation with the light extraction film group layer 30 to improve light emission efficiency.

[0060] In some embodiments, the refractive index n2 of the main extraction layer 31 is 1.7 to 2.6, i.e., n2 is 1.7 to 2.6, and / or the refractive index of the package structure 40 is 1.4 to 2.0, i.e., refractive index = 1.4 to 2.0.

[0061] For example, the refractive index n2 of the main extraction layer 31 is 1.7, 1.8, 1.9, 2.0, 2.1, 2.3, 2.5, or 2.6, and the refractive index of the package structure 40 is 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0.

[0062] In this application, a system is formed that can adjust the light emission direction of the light-emitting device layer 20 and / or improve the light emission efficiency of the light-emitting device layer 20 by matching the refractive indices of the light extraction film group layer 30 and the package structure 40, thereby increasing the light emission efficiency and achieving a good light emission effect.

[0063] In some embodiments, the refractive index n1 of the first sub-extraction layer is 1.2 to 1.6. For example, the refractive index n1 of the first sub-extraction layer is 1.2, 1.3, 1.4, 1.5, or 1.6.

[0064] In the first sub-extraction layer 321 and the main extraction layer 31, a low refractive index and a high refractive index arrangement are formed, and multiple light rays are refracted at the interface between them and enter the main extraction layer 31, thereby increasing the light emission efficiency.

[0065] In some embodiments, the difference in refractive index between any two of the at least two light extraction layers is 0.5 < Δn1(n2-n1) < 1.4. Exemplary examples of Δn1 values ​​include 0.6, 0.8, 0.9, 1.0, 1.1, 1.2, or 1.3.

[0066] When the difference in refractive index between any two light extraction layers is within the above range, the refractive indices of the light extraction film layer group can be matched to improve the light extraction efficiency.

[0067] In some embodiments, the thickness of the main extraction layer 31 is greater than the thickness of the first sub-extraction layer 321. Optionally, the thickness range of the first sub-extraction layer 321 is 5 nm < d1 < 40 nm, and the thickness range of the main extraction layer 31 is 20 nm < d2 < 70 nm. Optionally, the total thickness of the light extraction film group layer 30 is 50 nm < D1 = d1 + d2 < 110 nm. Exemplarily, the value of d1 is 8 nm, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm or 38 nm, and the value of d2 is 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm or 65 nm.

[0068] When the thickness of each layer of the light extraction film group layer 30 is within the above range, the combination with its refractive index can be ensured, and a good light extraction effect can be realized.

[0069] In some embodiments, the package structure 40 includes at least two package layers provided in a stacked manner. The at least two package layers include a main package layer 41 and at least one sub-package layer 42. The at least one sub-package layer 42 is provided on one side or both opposite sides of the main package layer. The refractive index of the main package layer 41 is smaller than the refractive index of the sub-package layer 42.

[0070] Two or more package layers can cooperate with the light extraction film group layer 30 to increase the optical interference distance and improve the light extraction efficiency.

[0071] In some embodiments, the sub-package layer (42) includes at least one layer, and the refractive index of the sub-package layer (42) located on one side of the main package layer (41) gradually decreases in the direction from the main package layer (41) to the sub-package layer (42).

[0072] For example, the subpackage layer 42 is provided only on the side of the main package layer 41 facing the substrate 10, the subpackage layer 42 includes multiple layers, and the refractive index of the multiple subpackage layers provided on the side of the main package layer 41 facing the substrate 10 gradually increases in the direction from the main extraction layer 31 to the sub extraction layer 32.

[0073] Exemplary, the subpackage layer 42 is provided on the side of the main package layer 41 facing the substrate 10, and also on the side of the main package layer 41 facing away from the substrate 10. The subpackage layer 42 provided on the side of the main package layer 41 facing the substrate 10 includes multiple layers, and the refractive index of the multiple layers of the subpackage layer 42 provided on the side of the main package layer 41 facing the substrate 10 gradually increases in the direction from the main package layer 41 to the subpackage layer. The subpackage layer 42 provided on the side of the main package layer 41 facing away from the substrate 10 also includes multiple layers, and the refractive index of the multiple layers of the subpackage layer provided on the side of the main package layer 41 facing away from the substrate 10 gradually increases in the direction from the main package layer 41 to the subpackage layer 42. Referring to Figure 1, the direction of the arrow includes the direction from the main package layer 41 to the subpackage layer 42.

[0074] In some embodiments, the subpackage layer 42 provided on the side of the main package layer 41 facing the substrate 10 is at least two layers, and the subpackage layer 42 provided on the side of the main package layer 41 facing away from the substrate 10 is a single layer, or the subpackage layer 42 provided on the side of the main package layer 41 facing the substrate 10 is a single layer, and the subpackage layer 42 provided on the side of the main package layer 41 facing away from the substrate 10 is at least two layers.

[0075] In some embodiments, the at least one subpackage layer includes at least one first subpackage layer 421 and at least one second subpackage layer 422, wherein the at least one first subpackage layer 421 and at least one second subpackage layer 422 are provided on opposite sides of the main package layer 41, with the refractive index n4 of the first subpackage layer 421 being 1.4 to 2.0, the refractive index n5 of the main package layer 41 being 1.4 to 1.6, and the refractive index n6 of the second subpackage layer 422 being 1.4 to 2.0.

[0076] For example, the values ​​of n4 are 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9; the values ​​of n5 are 1.4, 1.5, or 1.6; and the values ​​of n6 are 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0.

[0077] In the display panel according to the embodiment of this application, a light extraction film group layer 30 and a package structure 40 are designed above the light-emitting device layer 20. The light extraction film group layer 30 and the package structure 40 are designed as a multilayer structure, and by matching the refractive indices of at least two light extraction layers with the refractive indices of at least two package layers, the effect of improving light emission effect and efficiency is achieved. Here, the refractive index of the main extraction layer 31 is greater than the refractive index of the sub-extraction layer 32, and the refractive index of the main package layer 41 is less than the refractive index of the sub-package layer 42. A low refractive index, high refractive index, low refractive index, high refractive index structure is formed above the light-emitting device layer 20, forming a microcavity between it and the light-emitting device layer 20. As a result, the light emitted by the light-emitting device layer 20 is enhanced by the action of the microcavity, and the light emission efficiency can be improved. If the refractive index of the sub-extraction layer 32 is low, energy loss between the light-emitting device layer 20 and the light extraction film group layer 30 can be reduced.

[0078] In some embodiments, at least one subpackage layer is provided on both opposing sides of the main package layer, and the refractive indices of the subpackage layers located on both opposing sides of the main package layer are the same. For example, the refractive index of the first subpackage layer 421 may be 1.5, the refractive index of the main package layer 41 may be 1.4, and the refractive index of the second subpackage layer 422 may be 1.5. When the refractive indices of the first subpackage layer 421 and the second subpackage layer 422 are the same, light loss at the interface can be reduced and the light emission efficiency can be improved.

[0079] The refractive index of the first subpackage layer 421 and the refractive index of the second subpackage layer 422 may be different. For example, the refractive index of the first subpackage layer 421 may be 1.5, the refractive index of the main package layer 41 may be 1.4, and the refractive index of the second subpackage layer 422 may be 1.6.

[0080] The material of the subpackage layer may be an inorganic material, and the first subpackage layer 421 and the second subpackage layer 422 may contain one or more inorganic insulating materials selected from the group consisting of aluminum oxide, titanium oxide, tantalum oxide, hafnium oxide, zinc oxide, silicon oxide, silicon nitride, and silicon oxynitride.

[0081] In some embodiments, the first subpackage layer 421 and the second subpackage layer 422 may include an inorganic insulating layer containing a nonmetallic element such as silicon oxide, silicon nitride, or silicon oxynitride. The materials of the first subpackage layer 421 and the second subpackage layer 422 may be the same or different. For example, the first subpackage layer 421 may contain silicon oxynitride, and the second subpackage layer 422 may contain silicon nitride, but are not limited to these.

[0082] The material of the main package layer 41 may be an organic material, and the organic material can reduce the internal stress of the first subpackage layer 421 and / or the second subpackage layer 422. The material of the main package layer 41 may also include polymer materials. Polymer materials may include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyvinyl sulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, acrylic resin (e.g., polymethyl methacrylate, polyacrylic acid, etc.), or any combination thereof.

[0083] In some embodiments, if the difference in refractive index Δn2(n4-n5 or n6-n5) < 0.2 between any two of the at least two package layers, then the difference in refractive index of the light extraction layer is 0.6 < Δn3(n2-n1) < 1.2, and selectively, n2 = 2.2 to 2.6.

[0084] For example, the values ​​of Δn3 are 0.7, 0.8, 0.9, 1.0, or 1.1, and the values ​​of n2 are 2.2, 2.3, 2.4, 2.5, or 2.6.

[0085] When the difference in refractive index between the package layers is small, in order to achieve refractive index matching, the difference in refractive index between the light extraction layers must also be small.

[0086] In some embodiments, n1=1.4~1.6, n2=2.0~2.4, n4=1.7~2.0, n5=1.4~1.6, and n6=1.7~2.0, and the difference between the refractive index of the main extraction layer 31 and the refractive index of the first subpackage layer 421 is 0≦Δn4(n2-n4)<0.5. exemplified, the value of Δn4 is 0.1, 0.2, 0.3, or 0.4.

[0087] If the light extraction film group layer 30 and the package film group layer 40 are arranged in an alternating pattern of low / high / low / high refractive index, and the difference between the refractive index of the main extraction layer 31 and the refractive index of the first sub-package layer 421 is small, the light extraction efficiency can be further improved.

[0088] Referring to Figure 3, in some embodiments, the sub-extraction layer 32 includes at least one first sub-extraction layer 321, the at least one first sub-extraction layer 321 being located on the side of the main extraction layer facing the substrate 10, and the sub-extraction layer 32 further includes at least one second sub-extraction layer 322, the at least one second sub-extraction layer 322 being located on the side of the main extraction layer 31 away from the substrate 10, and the refractive index of the second sub-extraction layer 322 being smaller than the refractive index of the package structure.

[0089] The photo-extraction film group layer 30 includes, from bottom to top, a first sub-extraction layer 321, a main extraction layer 31, and a second sub-extraction layer 322. The refractive index of the main extraction layer 31 is greater than that of the first sub-extraction layer 321, and the refractive index of the main extraction layer 31 is greater than that of the second sub-extraction layer 322, forming a system with low refractive index, high refractive index, and low refractive index in the photo-extraction film group layer 30.

[0090] A microcavity is formed between the light extraction film group layer 30, the package structure 40, and the light-emitting device layer 20. The light emitted from the light-emitting device layer 20 is amplified by the action of the microcavity, thereby improving the light emission efficiency.

[0091] The materials of the first sub-extraction layer 321 and the second sub-extraction layer 322 may be the same or different. In some embodiments, the material of the photoextraction film group layer 30 is an organic material, which reduces stress between film layers and improves the adjustability of the panel's shape, for example, enabling winding or folding. Exemplarily, the material of the photoextraction film group layer 30 includes polymer resins such as polyethersulfone (PES), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyimide (PI), polycarbonate (PC), triacetylcellulose (TAC), and cellulose acetate propionate (CAP). The photoextraction film group layer 30 can be deposited using a single chamber, saving one deposition chamber compared to conventional optical structures.

[0092] In some embodiments, the refractive index n1 of the first sub-extraction layer 321 is 1.2 to 1.6, the refractive index n2 of the main extraction layer 31 is 1.7 to 2.6, and the refractive index n3 of the second sub-extraction layer 322 is 1.2 to 1.6.

[0093] For example, the values ​​of n1 are 1.2, 1.3, 1.4, 1.5, or 1.6; the values ​​of n2 are 1.7, 1.8, 1.9, 2.0, 2.1, 2.3, 2.5, or 2.6; and the values ​​of n3 are 1.2, 1.3, 1.4, 1.5, or 1.6.

[0094] By ensuring that the refractive index of each layer in the light extraction film group is within the above range, it is possible to guarantee that each layer cooperates with each other and achieve a good light extraction effect.

[0095] In some embodiments, the package structure 40 includes at least two stacked package layers, the at least two package layers include a main package layer 41 and at least one sub-package layer, the at least one sub-package layer includes at least one first sub-package layer 421 and at least one second sub-package layer 422, the at least one first sub-package layer 421 and at least one second sub-package layer 422 are provided on opposite sides of the main package layer 41, the refractive index of the main package layer 41 is smaller than the refractive index of the sub-package layer 42, and the refractive index of the second sub-extraction layer 322 is smaller than the refractive index of the first sub-package layer 421.

[0096] The package structure 40 includes a first subpackage layer 421, a main package layer 41, and a second subpackage layer 422 in order from bottom to top. The refractive index of the main package layer 41 is smaller than that of the first subpackage layer 421, the refractive index of the main package layer 41 is smaller than that of the second subpackage layer 422, and the refractive index of the second sub-extraction layer 322 is smaller than that of the first subpackage layer 421. The second sub-extraction layer 322 and the package structure 40 form a system with low refractive index, high refractive index, low refractive index, and high refractive index.

[0097] A microcavity is formed between the light extraction film group layer 30, the package structure 40, and the light-emitting device layer 20. The light emitted from the light-emitting device layer 20 is amplified by the microcavity, thereby improving the light emission efficiency.

[0098] In some embodiments, the refractive index n4 of the first subpackage layer 421 is 1.4 to 2.0, the refractive index n5 of the main package layer 41 is 1.4 to 1.6, and the refractive index n6 of the second subpackage layer 422 is 1.4 to 2.0.

[0099] Exemplarily, the value of n4 is 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9, the value of n5 is 1.4, 1.5, or 1.6, and the value of n6 is 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0.

[0100] In the second sub-extraction layer 322, the first sub-package layer 421, the main package layer 41, and the second sub-package layer 422, a system with a low refractive index, a high refractive index, a low refractive index, and a high refractive index is formed, and the light extraction efficiency can be improved.

[0101] In some embodiments, the thickness range of the first sub-extraction layer 321 is 0 < d1 < 40 nm, the thickness range of the main extraction layer 31 is 30 nm < d2 < 70 nm, and the thickness range of the second sub-extraction layer 322 is 20 nm < d3 < 50 nm.

[0102] Exemplarily, the value of d1 is 8 nm, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, or 38 nm, the value of d2 is 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm, or 65 nm, and the value of d3 is 25 nm, 28 nm, 30 nm, 35 nm, 38 nm, | 40 nm, 42 nm, 45 nm, or 48 nm.

[0103] In some embodiments, the total thickness of the light extraction film group layer 30 is 70 nm < D2 = d1 + d2 + d3 < 160 nm, and the difference in refractive index is 0.5 < Δn5 (n2 - n1 or n2 - n3) < 1.4. Exemplarily, the value of Δn5 is 0.7, 0.8, 0.9, 1.0, 1.2, or 1.3.

[0104] By ensuring that the thickness of each layer of the light extraction film group layer is within the above range, the matching with its refractive index can be guaranteed, and a good light extraction effect can be realized. In the embodiments of the present application, the light extraction efficiency can be improved by adjusting the refractive index and thickness of the light extraction film group layer 30 and the package structure 40.

[0105] In some embodiments, the thickness range d4 of the first subpackage layer is 1 to 1.5 μm, the thickness d5 of the main package layer is in the range of 9 to 12 μm, and the thickness d6 of the second subpackage layer is 0.7 to 1.2 μm.

[0106] For example, the values ​​of d4 are 1.0 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, or 1.5 μm; the values ​​of d5 are 9 μm, 10 μm, 11 μm, or 12 μm; and the values ​​of d3 are 0.7 μm, 0.8 μm, 0.9 μm, 1.0 μm, 1.1 μm, or 1.2 μm.

[0107] In some examples, n3 = 1.4 to 1.6, n4 = 1.8 to 2.0, n5 = 1.4 to 1.6, and n6 = 1.8 to 2.0.

[0108] In some embodiments, if the difference in refractive index Δn6(n4-n5 or n6-n5) < 0.4 between any two of the at least two package layers, then the difference between the refractive index of the first subpackage layer 421 and the refractive index of the second subextraction layer 322 is 0 ≤ Δn7(n4-n3) < 0.5. Exemplarily, the value of Δn7 is 0.1, 0.2, 0.3, or 0.4.

[0109] When the difference in refractive index between the package layers is small, in order to achieve refractive index matching, it is necessary that the difference between the refractive index of the first sub-package layer 421 and the refractive index of the second sub-extraction layer 322 be small, which can further improve light extraction efficiency.

[0110] In some embodiments, as shown in Figure 4, the light-emitting device layer 20 includes a plurality of light-emitting units, and the orthographic projection of each unit on the substrate is located within the orthographic projection region on the substrate of the light extraction film group layer.

[0111] The orthographic projection on the substrate of the light extraction film group layer covers the orthographic projection on the substrate of each light-emitting unit, and preferably, the orthographic projection on the substrate of the light extraction film group layer overlaps with the orthographic projection on the substrate of each light-emitting unit, ensuring that the light extraction film group layer 40 is provided directly above each light-emitting unit.

[0112] In some embodiments, as shown in Figure 5, the light-emitting device layer includes a first-color light-emitting unit 20a and a second-color light-emitting unit 20b, wherein the orthographic projection of the first-color light-emitting unit 20a on the substrate 10 lies within the orthographic projection region of the light extraction film group layer 30 on the substrate 10, and the orthographic projection of the second-color light-emitting unit 20b on the substrate 10 lies outside the orthographic projection region of the light extraction film group layer 30 on the substrate 10, and selectively, the first color is blue and the second color is red or green. These are not limited to the present invention.

[0113] In a second embodiment, the embodiment of the present application provides a display module including the above-described display panel.

[0114] The display module according to the embodiment of this application includes a display panel according to any of the embodiments described above, and therefore has the beneficial effects of the display panel according to the embodiments described above, but such a description is omitted here. The display module in the embodiment of this application may include structures such as a polarizing plate, a touch layer, and a cover plate. The polarizing plate is provided between the touch layer and the display panel, and the cover plate is provided on the side of the touch layer that is away from the display panel.

[0115] In a third embodiment, the embodiment of the present application provides a display device including the display panel or the display module described above.

[0116] The display devices in the embodiments of this application include, but are not limited to, devices having display functions such as mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, door access controls, smart landline phones, and consoles.

[0117] The display device according to the embodiment of this application includes a display module or display panel according to any of the embodiments described above, and therefore has the beneficial effects of the display panel of the embodiments described above, but a detailed explanation is omitted here.

[0118] The following embodiments are intended to illustrate the disclosures of this application in more detail, and are merely interpretive in nature, as it will be obvious to those skilled in the art that various modifications and changes can be made within the scope of the disclosures of this application.

[0119] Example 1 The display panel comprises a stacked substrate, a light-emitting device layer, a light extraction film group layer, and a package film group layer.

[0120] The light-emitting device layer includes, from bottom to top, a second electrode layer, a light-emitting structure, and a first electrode layer, with the refractive index of the light-emitting structure being 1.9.

[0121] The photo-extraction film group layer consists of a first sub-extraction layer, a main extraction layer, and a second sub-extraction layer, arranged from bottom to top, all of which are made of organic material. The refractive index of the first sub-extraction layer is n=1.5 and its thickness is d=20nm, the refractive index of the main extraction layer is n=2.2 and its thickness is d=50nm, and the refractive index of the second sub-extraction layer is n=1.5 and its thickness is d=25nm.

[0122] The package film group layers consist of a first subpackage layer, a main package layer, and another first subpackage layer, arranged from bottom to top. The refractive index of the first subpackage layer is n=1.8 and its thickness is d=1.2 μm. The refractive index of the main package layer is n=1.6 and its thickness is d=11 μm. The refractive index of the second subpackage layer is n=1.8 and its thickness is d=1.0 μm. The overall package structure and optical structure are arranged alternately so as to satisfy the low-high-low-high-low-high ratio.

[0123] Example 2 The display panel has a similar structure to the display panel in Example 1, and the differences between the two are as follows.

[0124] The photo-extraction film group layer consists of a first sub-extraction layer, a main extraction layer, and a second sub-extraction layer, all of which are made of organic material. The refractive index of the first sub-extraction layer is n=1.6 and its thickness is d=25nm, the refractive index of the main extraction layer is n=2.3 and its thickness is d=45nm, and the refractive index of the second sub-extraction layer is n=1.4 and its thickness is d=25nm.

[0125] The refractive index of the first subpackage layer is n=1.6 and its thickness is d=1.0 μm; the refractive index of the main package layer is n=1.4 and its thickness is d=9.5 μm; and the refractive index of the second subpackage layer is n=1.7 and its thickness is d=0.7 to 1.0 μm. The difference in n values ​​between the package structures is less than 0.4, and the difference in n values ​​between the package structure and the second sub-extraction layer is within 0.5. The overall package structure and optical structure are arranged so that the refractive index is low, high, low.

[0126] Example 3 The display panel has a similar structure to the display panel in Example 1, and the differences between the two are as follows.

[0127] The optical extraction film group layer includes a first sub-extraction layer and a main extraction layer in order from bottom to top. The refractive index of the first sub-extraction layer is n=1.6 and its thickness is d=25nm, while the refractive index of the main extraction layer is n=2.0 and its thickness is d=45nm.

[0128] The package structure consists of a first subpackage layer, a main package layer, and another first subpackage layer, arranged from bottom to top. The refractive index of the first subpackage layer is n=1.8 and its thickness is d=1.1μm. The refractive index of the main package layer is n=1.4 and its thickness is d=9.5μm. The refractive index of the second subpackage layer is n=1.9 and its thickness is d=1.0μm. The difference between the refractive index of the main extraction layer and the refractive index of the first subpackage layer is within 0.5. The overall package structure and optical structure are arranged alternately to satisfy the low-high-low-high refractive index pattern.

[0129] Example 4 The display panel has a similar structure to the display panel in Example 3, and the differences between the two are as follows.

[0130] The optical extraction film group layer includes a first sub-extraction layer and a main extraction layer in order from bottom to top. The refractive index of the first sub-extraction layer is n=1.5 and its thickness is d=30nm, while the refractive index of the main extraction layer is n=2.1 and its thickness is d=60nm.

[0131] The refractive index of the first subpackage layer is n=1.5 and its thickness is d=1.0 μm, while the refractive index of the main package layer is n=1.3 and its thickness is d=10 μm. The refractive index of the second subpackage layer is n=1.5 and its thickness is d=1.2 μm. The overall package structure and optical structure are arranged alternately to satisfy the low-high-low refractive index pattern. Comparative Example 1

[0132] The display panel has a similar structure to the display panel in Example 1, with the differences being as follows: The light extraction film group layer includes an organic light extraction layer and a LiF layer in that order from bottom to top. The refractive index of the organic light extraction layer is n=2.1 and its thickness is d=75nm, while the refractive index of the LiF layer is n=1.4 and its thickness is d=30nm.

[0133] White light efficiency of Examples 1-4 and Comparative Example 1 [Table 1]

[0134] As can be seen from Table 1, in Examples 1 to 4 of this application, by matching the refractive index and thickness using the light extraction film group layer and package film group layer structure, a system is formed that can adjust the light emission direction of the light-emitting device layer and / or improve the light emission efficiency of the light-emitting device layer, thereby increasing the light emission efficiency and achieving a good light emission effect. Here, the refractive index of the main extraction layer is greater than that of the first sub-extraction layer, and the refractive index of the main extraction layer is greater than that of the package structure, forming a system with low refractive index, high refractive index, and low refractive index in the light extraction film group layer and package structure, forming a microcavity between it and the light-emitting device layer, and the light emitted from the light-emitting device layer is amplified by the action of the microcavity, thereby improving the light emission efficiency. Compared to Comparative Example 1, this application can improve the light emission efficiency by optimizing the structure.

[0135] While this application has been described above with reference to preferred embodiments, various modifications can be made to them and their components can be replaced with equivalents without departing from the scope of this application. In particular, each technical feature described in each embodiment can be combined in any way, provided that there is no structural inconsistency. This application is not limited to the specific embodiments disclosed herein, but includes all technical concepts included in the claims. [Explanation of Symbols]

[0136] In the drawings, the same component is assigned the same reference numeral. The drawings are not drawn to actual scale. 10 Substrate, 20 Light-emitting device layer, 20a First color light-emitting unit, 20b Second color light-emitting unit, 21 Second electrode layer, 22 Light-emitting structure, 23 First electrode layer, 24 Pixel definition layer 30 Light extraction film group layer, 31 Main extraction layer, 32 Sub extraction layer, 321 First sub extraction layer, 322 Second sub extraction layer 40 Package structure, 41 Main package layer, 42 Sub-package layer, 421 First sub-package layer, 422 Second sub-package layer.

Claims

1. circuit board and A light-emitting device layer provided on one side of the substrate, The light-emitting device layer includes at least two light extraction layers, which are provided on the side of the light-emitting device layer facing away from the substrate and are laminated together, the at least two light extraction layers each comprising a main extraction layer and at least one sub-extraction layer, the sub-extraction layer being provided on one side or both opposing sides of the main extraction layer, and the light extraction film group layer having a refractive index greater than that of the sub-extraction layer, The light extraction film group layer comprises a package structure provided on the side facing away from the substrate, The sub-extraction layer includes at least one first sub-extraction layer, the at least one first sub-extraction layer is provided on the substrate-facing side of the main extraction layer, the package structure includes at least two stacked package layers, the at least two package layers include a main package layer and at least one sub-package layer, the at least one sub-package layer is provided on one side or both opposing sides of the main package layer, the refractive index of the main package layer is smaller than the refractive index of the sub-package layer, The at least one subpackage layer includes at least one first subpackage layer and at least one second subpackage layer, and the at least one first subpackage layer and the at least one second subpackage layer are provided on opposite sides of the main package layer. The number of sub-package layers provided on one side of the main package layer is multiple, and the refractive index of the multiple sub-package layers gradually increases in the direction from the main package layer to the sub-package layers. The light-emitting device layer includes a first-color light-emitting unit and a second-color light-emitting unit, wherein the orthographic projection of the first-color light-emitting unit on the substrate is located within the orthographic projection region of the light extraction film group layer on the substrate, and the orthographic projection of the second-color light-emitting unit on the substrate is located outside the orthographic projection region of the light extraction film group layer on the substrate. A display panel characterized in that the first color is blue, and the second color is red or green.

2. The refractive index of the package structure is smaller than the refractive index of the main extraction layer, The display panel according to claim 1, characterized in that the package structure is provided on the surface of the light extraction film group layer.

3. The refractive index n of the main extraction layer ２ The refractive index is 1.7 to 2.6, and the refractive index of the package structure is 1.4 to 2.

0. The refractive index n of the first sub-extraction layer １ It is 1.2 to 1.6, The display panel according to claim 2, characterized in that the difference in refractive index Δn1 between any two of the at least two light extraction layers is greater than 0.5 and less than 1.

4.

4. The thickness of the main extraction layer is greater than the thickness of the first sub-extraction layer. The thickness range of the first sub-extraction layer is 5 nm < d １ <40 nm, and the thickness range of the main extraction layer is 20 nm < d ２ <70nm, The total thickness of the aforementioned light extraction film group layer is 50 nm < D １ = d １ +d ２ The display panel according to claim 2, characterized in that it is <110 nm.

5. The refractive index n of the first sub-package layer ４ is 1.4 to 2.0, and the refractive index n of the main package layer ５ is 1.4 to 1.6, and the refractive index n of the second sub-package layer ６ is 1.4 to 2.0, and the display panel according to claim 2 or 3, characterized in that.

6. The display panel according to claim 1, characterized in that the at least one subpackage layer is provided on both opposing sides of the main package layer, and the refractive index of the subpackage layers located on both opposing sides of the main package layer is the same.

7. The difference in refractive index Δn2(n) between any two of the at least two package layers in the package layer. ４ -n ５ or n ６ -n ５ If ) < 0.2, the difference in refractive index between the main extraction layer and the first subpackage layer is 0.6 < Δn3(n ２ -n ４ ) < 1.2, n ２ The display panel according to claim 5, characterized in that the ratio is 2.2-2.

6.

8. The refractive index of the first sub-extraction layer is smaller than the refractive index of the first sub-package layer. n １ It is 1.4 to 1.6, and n ２ n is 2.0 to 2.4, ４ n is 1.7 to 2.

0. ５ It is 1.4 to 1.6, and n ６ The refractive index is 1.7 to 2.0, and the difference between the refractive index of the main extraction layer and the refractive index of the first sub-package layer is 0 ≤ Δn4(n ２ -n ４ The display panel according to claim 5, characterized in that < 0.

5.

9. The display panel according to claim 1, wherein the sub-extraction layer includes at least one first sub-extraction layer, the at least one first sub-extraction layer is provided on the side of the main extraction layer facing the substrate, the sub-extraction layer further includes at least one second sub-extraction layer, the at least one second sub-extraction layer is located on the side of the main extraction layer facing away from the substrate, and the refractive index of the second sub-extraction layer is smaller than the refractive index of the package structure.

10. The refractive index n of the first sub-extraction layer １ The refractive index n of the main extraction layer is 1.2 to 1.

6. ２ The refractive index n of the second sub-extraction layer is 1.7 to 2.

6. ３ The display panel according to claim 9, characterized in that the value is 1.2 to 1.

6.

11. The package structure includes at least two stacked package layers, the at least two package layers include a main package layer and at least one sub-package layer, the at least one sub-package layer includes at least one first sub-package layer and at least one second sub-package layer, the at least one first sub-package layer and the at least one second sub-package layer are provided on opposite sides of the main package layer, the refractive index of the main package layer is smaller than that of the sub-package layer, and the refractive index of the second sub-extraction layer is smaller than that of the first sub-package layer. The refractive index n of the first subpackage layer ４ The refractive index n of the main package layer is 1.4 to 2.

0. ５ The refractive index n of the second subpackage layer is 1.4 to 1.

6. ６ The display panel according to claim 9 or 10, characterized in that the value is 1.4 to 2.

0.

12. The thickness range of the first sub-extraction layer is 0 < d １ <40 nm, and the thickness range of the main extraction layer is 30 nm < d ２ <70 nm, and the thickness range of the second sub-extraction layer is 20 nm < d ３ <50 nm, The total thickness of the aforementioned light extraction film group layer is 70 nm < D ２ = d １ +d ２ +d ３ The display panel according to claim 9, characterized in that it is <160 nm.

13. The difference in refractive index between any two of the two light extraction layers is 0.5 < Δn5(n ２ -n １ or n ２ -n ３ The display panel according to claim 11, characterized in that < 1.

4.

14. n ３ n is 1.4 to 1.6, ４ n is 1.8 to 2.0, ５ n is 1.4 to 1.6, ６ The display panel according to claim 11, characterized in that the value is 1.8 to 2.

0.

15. The difference in refractive index between any two of the at least two package layers is Δn6(n ４ -n ５ or n ６ -n ５ If ) < 0.4, the difference between the refractive index of the first subpackage layer and the refractive index of the second subextraction layer is 0 ≤ Δn7(n ４ -n ３ The display panel according to claim 11, characterized in that < 0.

5.

16. The display panel according to claim 1, characterized in that the light-emitting device layer includes a plurality of light-emitting units, and the orthographic projection of each of the light-emitting units on the substrate is located within the orthographic projection region on the substrate of the light extraction film group layer.

Images