Display panel and display device

Abstract

The application provides a display panel and a display device with the display panel, and relates to the technical field of display. The display panel comprises a display substrate and a functional layer. The functional layer is arranged on one side of the light-emitting surface of the display substrate and is made of a composite material. The composite material comprises a base material and a crystallization inhibitor for inhibiting crystallization of the base material. In this way, the problem of crystallization of the functional layer during the operation of the display panel can be effectively improved, so that the display effect and the service life of the display panel are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel and a display device having the same. BACKGROUND

[0002] With the continuous development of display technology, consumers have higher and higher requirements for display panels. The display effect and service life of the display panel are important indicators for consumers and panel manufacturers to measure the quality of the display panel, and an important factor affecting the display effect and service life of the display panel is the stability of the material of the functional film layer of the display panel. Specifically, during the working process of the display panel, as the working environment temperature of the display panel rises, the material of some functional film layers may crystallize, thereby affecting the display effect and service life of the display panel.

[0003] Therefore, there is an urgent need to provide a new solution to reduce the risk of crystallization of the functional layer of the display panel, thereby improving the display effect and service life of the display panel. SUMMARY

[0004] The first aspect of the present application provides a display panel, comprising a display substrate and a functional layer. The functional layer is arranged on one side of the light-emitting surface of the display substrate and is made of a composite material. The composite material comprises a base material and a crystallization inhibitor for inhibiting crystallization of the base material.

[0005] In the above solution, by using the composite material containing the crystallization inhibitor to prepare the functional layer, the phenomenon of crystallization of the functional layer during the working process of the display panel can be effectively improved, thereby improving the display effect and service life of the display panel.

[0006] In combination with the first aspect, in some embodiments, the base material is an organic material with a refractive index greater than 1.7, and the crystallization inhibitor is doped in the base material.

[0007] In the above solution, the design scheme of using the organic material with a refractive index greater than 1.7 as the base material can improve the coupling effect of the functional layer on light, thereby improving the light-emitting efficiency of the display panel.

[0008] In combination with the first aspect, in some embodiments, the crystallization inhibitor is an organic material containing at least one hydroxyl group. Further, the organic material includes at least one of a phenolic derivative and an alcoholic derivative.

[0009] In the above solution, the crystallization inhibitor reduces the ability of the molecules of the base material to migrate under heat by forming an interaction with the molecules of the base material, thereby playing a role in reducing the crystallization of the base material.

[0010] In some embodiments, the crystallization inhibitor is an organic material having a dahn value less than 45. Further, the organic material includes at least one of polytetrafluoroethylene, polyethylene, and polypropylene.

[0011] In the above aspect, the crystallization inhibitor reduces the crystallization ability of the substrate by reducing the migration and aggregation ability of the molecules of the substrate, thereby reducing the interaction between the molecules of the substrate.

[0012] In some embodiments, the crystallization inhibitor is an organic material having a dahn value less than 45 and an organic material including at least one hydroxyl group.

[0013] In the above aspect, the crystallization inhibitor is not limited to a certain type of material, thereby increasing the selection range of the crystallization inhibitor.

[0014] In some embodiments, the mass of the crystallization inhibitor accounts for 0.1% to 10% of the total mass of the substrate and the crystallization inhibitor.

[0015] In the above aspect, by limiting the mass ratio of the crystallization inhibitor to the substrate in the composite material for preparing the functional layer, the crystallization ability of the functional layer can be reduced while the optical performance of the functional layer is not substantially affected.

[0016] In some embodiments, the mass of the crystallization inhibitor accounts for 0.1% to 1% of the total mass of the substrate and the crystallization inhibitor.

[0017] In some embodiments, the substrate is N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine.

[0018] In some embodiments, the display substrate includes a substrate and a plurality of sub-pixel units disposed on the substrate. Each sub-pixel unit includes a first electrode, a light-emitting layer, and a second electrode stacked on the substrate, and the functional layer is located on a side of the second electrode away from the substrate.

[0019] In some embodiments, the functional layer is a light extraction layer disposed on a surface of the side of the second electrode away from the substrate.

[0020] In the above aspect, by disposing the light extraction layer close to the light-emitting layer, the light extraction efficiency of the display panel can be further improved.

[0021] In some embodiments, the display panel further includes an encapsulation layer including a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence on the side of the light extraction layer away from the substrate.

[0022] The second aspect of the present application provides a display device, comprising the display panel of any one of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows.

[0024] Figure 1 is a plan view of a display panel according to an embodiment of the present application.

[0025] Figure 2 is a cross-sectional view of the display panel in the MN direction in Figure 1

[0026] Figure 3 is a scanning electron microscope (SEM) image of a light extraction layer corresponding to the comparative example according to an embodiment of the present application.

[0027] Figure 4a is a scanning electron microscope (SEM) image of a light extraction layer corresponding to example 1 according to an embodiment of the present application.

[0028] Figure 4b is a scanning electron microscope (SEM) image of a light extraction layer corresponding to example 2 according to an embodiment of the present application.

[0029] Figure 4c is a scanning electron microscope (SEM) image of a light extraction layer corresponding to example 3 according to an embodiment of the present application.

[0030] Figure 4d is a scanning electron microscope (SEM) image of a light extraction layer corresponding to example 4 according to an embodiment of the present application.

[0031] Figure 4e is a scanning electron microscope (SEM) image of a light extraction layer corresponding to example 5 according to an embodiment of the present application.

[0032] Figure 5a is a scanning electron microscope (SEM) image of a light extraction layer corresponding to example 6 according to an embodiment of the present application.

[0033] Figure 5b is a scanning electron microscope (SEM) image of a light extraction layer corresponding to example 9 according to an embodiment of the present application.

[0034] Figure 6 is a relationship between the refractive index and the wavelength of a light extraction layer prepared from the material obtained from the comparative example 1 and example 5 according to the present application.

[0035] Figure 7 ​The transmittance and wavelength of the light extraction layer prepared from the material obtained according to the application Example 1 and the application Example 5 are related. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0037] Currently, it is a general trend to replace liquid crystal display technology and fluorescent lamp lighting technology with organic electroluminescent device (OLED: Organic Light Emission Diodes) technology in display panels. Therefore, improving the light-emitting effect of the OLED device can effectively improve the user experience of the display panel. The OLED device includes a cathode, an anode, and a light-emitting layer disposed between the cathode and the anode. When a voltage is applied to the cathode and the anode, and the positive and negative charges in the light-emitting layer are acted on by an electric field, the positive and negative charges further recombine in the organic light-emitting layer in the light-emitting layer to generate photons, that is, OLED electroluminescence is generated. In order to improve the display effect of the display panel, some functional film layers are usually arranged on the light-emitting side of the OLED device. For example, in order to improve the out-coupling efficiency of the OLED device, a high-refractive film layer is usually added on the cathode. This film layer is called a light extraction layer (Capping Layer, CPL), so that the light originally limited in the OLED device can be emitted out of the OLED device, thereby improving the light-emitting efficiency of the OLED device. However, the material of the CPL layer is prone to crystallization in a long-time high-temperature environment, thereby affecting the light-emitting effect of the OLED device, and further directly affecting the display effect of the display panel.

[0038] In view of this, the embodiments of the application provide a display panel, and refer to the plan view of the display panel shown in Figure 1 and the corresponding Figure 2 in Figure 1 The cross-sectional view of the MN direction in the display panel in It can be seen that the display panel includes a display substrate 100 and a functional layer 200. The functional layer 200 is arranged on one side of the light-emitting surface of the display substrate 100 and is made of a composite material. The composite material includes a base material and a crystallization inhibitor for inhibiting crystallization of the base material. In this way, the design scheme of the functional layer 100 containing the crystallization inhibitor capable of inhibiting crystallization of the base material in the material of the functional layer 100 makes the crystallization problem of the functional layer 100 of the display panel working in a long-time high-temperature environment effectively improved, thereby reducing the influence of the high-temperature environment on the performance of the functional layer 200, and further improving the display effect and the service life of the display panel.

[0039] The structure of the display panel is then described in more detail, and the specific positions and functions of the functional layer are described in detail in combination with the film layer structure of the display panel, as follows.

[0040] In some embodiments, the display substrate includes a substrate and a plurality of sub-pixel units disposed on the substrate. Each sub-pixel unit includes a first electrode, a light-emitting layer, and a second electrode stacked on the substrate, and the functional layer is located on a side of the second electrode facing away from the substrate. For example, referring to Figure 1 The plan view of the display panel shows that the display panel includes a display area AA and a non-display area NA surrounding the display area AA, and the display substrate 100 of the display panel includes a substrate 110 and a plurality of sub-pixel units 120 arranged in an array on the substrate 100 in the corresponding display area AA. Specifically, the plurality of sub-pixel units 120 are divided into red (Red) sub-pixel units, i.e., sub-pixels R, green (Green) sub-pixel units, i.e., sub-pixels G, and blue (Blue) sub-pixel units, i.e., sub-pixels B, which include an anode 121, a light-emitting layer 122, and a cathode 123 stacked on the substrate 110, and a functional layer 200 is disposed on a side of the cathode 123 facing away from the substrate 110.

[0041] It should be understood that the type and array arrangement of the sub-pixel units included in the display panel are not limited to the schemes in the above examples, and the display panel can also include sub-pixel units that emit light of other colors, such as yellow light. In addition, the display panel is also not limited to the top-emitting manner in the above examples, and the light-emitting layer includes but is not limited to film layer structures such as a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer. These can all be set according to the functional requirements of the display panel, and will not be described here.

[0042] In at least one embodiment, the functional layer is a light extraction layer disposed on the surface of the side of the second electrode facing away from the substrate. In this way, the functional layer is set as a light extraction layer, which changes the optical path to make the originally unemitted light of the display panel finally emit from the display panel, thereby improving the light extraction efficiency of the display panel. In addition, the light extraction layer is disposed close to the light-emitting layer, reducing the loss of light, thereby further improving the light extraction efficiency of the display panel. For example, continuing to refer to Figure 2 It can be seen that the light extraction layer 200a is disposed on the surface of the side of the cathode 123 facing away from the substrate 110, and the light extraction layer 200a serves as the functional layer 200 of the display panel to improve the light extraction coupling efficiency of the display panel.

[0043] It should be understood that the light extraction layer is not limited to being disposed on the surface of the side of the cathode facing away from the substrate, but can also be disposed at other locations, such as between the cathode and the light-emitting layer. In addition, the functional layer is not limited to being a light extraction layer, but can also be a film layer that implements other functions, such as being a film layer with a high relative refractive index in the formation of a lens structure, which can improve the display effect of the display panel at a large viewing angle.

[0044] Based on the above-described scheme in which the functional layer is a light extraction layer, the present embodiment next describes the formulation related to the composite material for preparing the light extraction layer, as follows.

[0045] In some embodiments, the substrate in the composite material for preparing the light extraction layer is an organic material with a refractive index greater than 1.7, and the crystallization inhibitor is doped in the substrate. In at least one embodiment, the substrate is N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine. In this way, the substrate uses an organic material with a refractive index greater than 1.7, so that the design scheme in which the refractive index of the light extraction layer is greater than the refractive index of the second electrode can improve the coupling of light by the light extraction layer, thereby improving the display effect of the display panel. In addition, the preparation of the composite material uses a mature doping process, which saves the material preparation cost.

[0046] In addition to the limitation on the substrate in the composite material for preparing the light extraction layer, the material of the crystallization inhibitor in the composite material is also limited in the present embodiment.

[0047] For example, in some embodiments, the crystallization inhibitor is an organic material containing at least one hydroxyl group. In at least one embodiment, the organic material containing at least one hydroxyl group includes at least one of a phenolic derivative and an alcoholic derivative. The crystallization inhibitor reduces the ability of the molecules of the substrate to migrate upon heating by forming an interaction with the molecules of the substrate, thereby reducing the crystallization of the substrate.

[0048] For another example, in other embodiments, the crystallization inhibitor is an organic material with a Dali value less than 45. In at least one embodiment, the organic material with a Dali value less than 45 includes at least one of polytetrafluoroethylene, polyethylene, and polypropylene. The crystallization inhibitor reduces the crystallization ability of the substrate by reducing the migration and aggregation ability of the molecules of the substrate, thereby reducing the interaction between the molecules of the substrate.

[0049] For another example, in other embodiments, the crystallization inhibitor is an organic material with a Dali value less than 45 and an organic material containing at least one hydroxyl group. In at least one embodiment, the organic material containing at least one hydroxyl group includes at least one of a phenolic derivative and an alcoholic derivative. The organic material with a Dali value less than 45 includes at least one of polytetrafluoroethylene, polyethylene, and polypropylene.

[0050] In this embodiment, after introducing the material selection of each component in the formulation of the composite material for preparing the light extraction layer, the relative mass ratio between each material is also introduced to improve the completeness of the formulation of the composite material for preparing the light extraction layer. The specific content is as follows.

[0051] In some embodiments, the mass of the crystallization inhibitor accounts for 0.1% to 10% of the total mass of the substrate and the crystallization inhibitor. In at least one embodiment, the mass of the crystallization inhibitor accounts for 0.1% to 1% of the total mass of the substrate and the crystallization inhibitor. Thus, by limiting the mass percentage of the crystallization inhibitor in the composite material used to prepare the light extraction layer, it is possible to reduce the crystallization ability of the light extraction layer at high-temperature environments, such as 30°C to 120°C, while substantially not affecting the optical properties of the light extraction layer. Optionally, the mass of the crystallization inhibitor accounts for 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.5%, 2.0%, 3.0%, 4.0%, 5.0%, 6.0%, 7.0%, 8.0%, 9.0%, or 10% of the total mass of the substrate and the crystallization inhibitor.

[0052] Based on the formulation of the composite material for preparing the light extraction layer provided in the above embodiments, this embodiment provides several specific embodiments of the composite material, wherein the mass ratio of each component is the ratio of the mass of the component to the total mass of the corresponding composite material, that is, the sum of the mass ratios of the substrate and the crystallization inhibitor is 100%.

[0053] Example 1: 0.1% by mass of 1,4-naphthol was doped into 99.9% by mass of N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, and the mixture was homogeneous to obtain a composite material.

[0054] Example 2: 0.5% by mass of 1,4-naphthol was doped into 99.5% by mass of N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, and the mixture was homogeneous to obtain a composite material.

[0055] Example 3: 1% by mass of 1,4-naphthol was doped with 99% by mass of N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, and the mixture was homogeneous to obtain a composite material.

[0056] Example 4: 5% by mass of 1,4-naphthol was doped with 95% by mass of N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, and the mixture was homogeneous to obtain a composite material.

[0057] Example 5, 10% 1,4-naphthalenediol by mass is doped in 90% N,N'-diphenyl-N,N'-(1- naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0058] Example 6, 0.1% polypropylene by mass is doped in 99.9% N,N'-diphenyl-N,N'-(1- naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0059] Example 7, 0.5% polypropylene by mass is doped in 99.5% N,N'-diphenyl-N,N'-(1- naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0060] Example 8, 1% polypropylene by mass is doped in 99% N,N'-diphenyl-N,N'-(1- naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0061] Example 9, 5% polypropylene by mass is doped in 95% N,N'-diphenyl-N,N'-(1- naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0062] Example 10, 10% polypropylene by mass is doped in 90% N,N'-diphenyl-N,N'-(1- naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0063] Example 11, 0.1% polypropylene and 1,4-naphthalenediol by mass are doped in 99.9% N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0064] Example 12, 0.5% polypropylene and 1,4-naphthalenediol by mass are doped in 99.5% N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0065] Example 13, 1% polypropylene and 1,4-naphthalenediol by mass are doped in 99% N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine by mass, after mixing evenly, a composite material is obtained.

[0066] Example 14, 5% polypropylene and 1,4-naphthalenediol by mass ratio were doped in 95% N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine by mass ratio, and after uniform mixing, a composite material was obtained.

[0067] Example 15, 10% polypropylene and 1,4-naphthalenediol by mass ratio were doped in 90% N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine by mass ratio, and after uniform mixing, a composite material was obtained.

[0068] In addition, in order to better reflect the improvement of the crystallization of the composite material for preparing the functional layer provided in the embodiment, a comparative example is also provided in the embodiment, and the specific scheme is as follows.

[0069] Comparative Example 1, N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine material as a material for preparing a light extraction layer.

[0070] The composite materials obtained in Examples 1-15 and the material in Comparative Example 1 were respectively deposited on the surface of the cathode of the display panel away from the substrate by a gas phase deposition process to form a light extraction layer with the same thickness, specifically 1000A. And using a scanning electron microscope (SEM) to observe the crystallization of the light extraction layer after 240h in a temperature environment of 85°C. And by analyzing the SEM images of different examples and Comparative Example 1, the influence of different crystallization inhibitors on improving the anti-crystallization ability of the light extraction layer can be more clearly seen.

[0071] Comparison Figure 3 And Figure 4a , Figure 4b , Figure 4c , Figure 4d And Figure 4e It can be seen that after doping the crystallization inhibitor 1,4-naphthalenediol in the substrate, the problem of crystallization of the corresponding light extraction layer at high temperature can be effectively improved, and with the increase of the mass ratio of the crystallization inhibitor in the range of 0.1%-10%, the crystallization in the light extraction layer is less and less, even negligible. At the same time, comparison Figure 3 And Figure 5a And Figure 5bIt can be seen that, after another crystallization inhibitor polypropylene is doped in the substrate, the crystallization problem of the corresponding light extraction layer at high temperature can be effectively improved, and the crystallization in the light extraction layer becomes less and less with the increase of the mass ratio of the crystallization inhibitor. Based on the above analysis, it can be seen that the crystallization problem of the corresponding light extraction layer can also be effectively improved by doping 1,4-naphthalene diol and polypropylene, two kinds of crystallization inhibitors, in the substrate.

[0072] In addition, with reference to Figure 6 and Figure 7 It can be seen that the transmittance and refractive index between the light extraction layer prepared by the composite material doped with the crystallization inhibitor and the light extraction layer prepared by the substrate without doping the crystallization inhibitor are basically similar, that is, the introduction of the crystallization inhibitor has little effect on the optical performance of the light extraction layer, which can be ignored.

[0073] It should be understood that, in the design process of the display panel, the thickness of the light extraction layer is generally set to 30-150nm, and the thickness of the light extraction layer in the above-mentioned different embodiments and the comparative example 1 is equal, not absolutely equal, but equal within the allowable error range, and the specific thickness of the light extraction layer can be designed according to the functional requirements of the display panel. In addition, the selection of the crystallization inhibitor is not limited to at least one of 1,4-naphthalene diol and polypropylene in the above examples, but at least one of other phenolic derivatives and alcoholic derivatives and polytetrafluoroethylene and polyethylene can also be selected. The above can be designed according to the actual production demand, which will not be described here.

[0074] In some embodiments, with reference to Figure 2 It can be seen that the display panel further comprises an encapsulation layer 300, which comprises a first inorganic encapsulation layer 310, an organic encapsulation layer 320 and a second inorganic encapsulation layer 330 which are sequentially stacked on the side of the light extraction layer 200a away from the substrate 110. The refractive index of the first inorganic encapsulation layer 310 is less than the refractive index of the light extraction layer 200a.

[0075] It should be understood that other film layers can also be provided between the light extraction layer and the encapsulation layer, and the refractive index of the film layer formed on the surface of the light extraction layer away from the substrate is less than or equal to 1.6, that is, less than the refractive index of the light extraction layer, and the film layer can be an inorganic film layer or an organic film layer, such as an optical adhesive layer. In addition, the encapsulation method of the display panel is not limited to the flexible encapsulation scheme in the above examples, but rigid encapsulation can also be achieved by using an encapsulation cover plate and an encapsulation material, which can be designed according to the functional requirements of the display panel, and will not be described here.

[0076] The embodiments of the present application also provide a display device, which comprises the display panel of any one of the above embodiments.

[0077] In at least one embodiment, the display device can be any product or component with display and touch function, such as mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator, etc. The implementation of the display device can refer to the above-mentioned embodiments of the display panel, and the repeated parts will not be described again.

[0078] The above is merely specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A display panel, characterized in that, include: A display substrate includes a substrate and a plurality of sub-pixel units disposed on the substrate. Each sub-pixel unit includes a first electrode, a light-emitting layer, and a second electrode sequentially stacked on the substrate. A functional layer, which is a light extraction layer, is disposed on the surface of the second electrode on the side opposite to the substrate. The functional layer is made of a composite material, which includes a substrate and a crystallization inhibitor, the crystallization inhibitor being used to inhibit the crystallization of the substrate. Wherein, the crystallization inhibitor is an organic material containing at least one hydroxyl group, the organic material including at least one of phenolic derivatives and alcohol derivatives, and / or, the crystallization inhibitor is an organic material with a dyne value of less than 45, the organic material including at least one of polytetrafluoroethylene, polyethylene and polypropylene.

2. The display panel according to claim 1, characterized in that, The substrate is an organic material with a refractive index greater than 1.7, and the crystallization inhibitor is doped into the substrate.

3. The display panel according to claim 1, characterized in that, The composite material was obtained by doping 0.1% 1,4-naphthol with 99.9% N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine by mass and mixing them evenly.

4. The display panel according to claim 1, characterized in that, The mass of the crystallization inhibitor accounts for 0.1% to 10% of the total mass of the substrate and the crystallization inhibitor.

5. The display panel according to claim 4, characterized in that, The mass of the crystallization inhibitor accounts for 0.1% to 1% of the total mass of the substrate and the crystallization inhibitor.

6. The display panel according to claim 1, characterized in that, The substrate is N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine.

7. The display panel according to claim 1, characterized in that, It also includes an encapsulation layer, which comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, which are sequentially stacked on the side of the light extraction layer opposite to the substrate.

8. A display device, characterized in that, The display panel includes any one of claims 1 to 7.

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