Display panel, manufacturing method thereof and display device

Abstract

Embodiments of the present application provide a display panel, a manufacturing method thereof and a display device. The display panel comprises a substrate, a display layer located on one side of the substrate, the display layer comprising light emitting devices and a pixel definition layer located between adjacent light emitting devices, and a light extraction layer located on a side of the display layer away from the substrate, the light extraction layer comprising a stacked cushion layer, a first refractive layer and a second refractive layer, the first refractive layer being located between the cushion layer and the second refractive layer. The present application can adjust the shape of the first refractive layer by using the cushion layer, and the first refractive layer does not need to use its own thickness to form a structure with an inclined angle, thereby liberating the restriction on the material of the first refractive layer and increasing the richness of the optional materials of the first refractive layer.

Description

TECHNICAL FIELD

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

[0002] OLED (Organic Light-Emitting Diode) has the characteristics of self-luminous, and does not need to set an additional light source when applied in the display field, which is conducive to the light and thin of the whole display device, and can realize the manufacturing of flexible display screen. The OLED display panel also has the advantages of high brightness, low power consumption, fast response, high definition, good flexibility and high luminous efficiency, which can meet the new needs of consumers for display technology. However, in the current organic light emitting display technology, part of the large-angle light emitted by the light emitting device is limited in the display panel and cannot be emitted out of the display panel to contribute to the pixel light emission, which affects the overall light extraction efficiency of the light emitting device. SUMMARY

[0003] The embodiments of the present application provide a display panel, a manufacturing method thereof and a display device to solve the technical problem of improving the light extraction efficiency of the light emitting device.

[0004] In a first aspect, the embodiments of the present application provide a display panel, which comprises:

[0005] a substrate;

[0006] a display layer located on one side of the substrate, the display layer comprising light emitting devices and a pixel definition layer located between adjacent light emitting devices;

[0007] a light extraction layer located on the side of the display layer away from the substrate, the light extraction layer comprising a stack of a pad layer, a first refractive layer and a second refractive layer, the first refractive layer being located between the pad layer and the second refractive layer.

[0008] In a second aspect, the embodiments of the present application further provide a display device comprising the display panel provided by any of the embodiments of the present application.

[0009] In a third aspect, the embodiments of the present application further provide a manufacturing method of a display panel, which comprises:

[0010] forming a substrate;

[0011] forming a display layer on the substrate, the display layer comprising light emitting devices and a pixel definition layer located between adjacent light emitting devices;

[0012] manufacturing a pad layer on the display layer;

[0013] manufacturing a first refractive layer on the pad layer by using an inorganic film forming process;

[0014] A raw material for forming the second refractive layer is provided, and the raw material is mixed with a solvent to obtain a mixed solution;

[0015] The mixed solution is coated on a side of the first refractive layer away from the substrate to form the second refractive layer.

[0016] The display panel, the manufacturing method thereof, and the display device provided by the embodiments of the present application have the following beneficial effects: the light extraction layer is arranged in the light emitting direction of the light emitting device, and the light extraction layer can be used to improve the light emitting efficiency of the light emitting device. In the embodiments of the present application, the light extraction layer includes the stacked pad layer, the first refractive layer, and the second refractive layer, the pad layer is arranged at the bottom of the stacked structure, and the pad layer can adjust the shape of the first refractive layer, so that the interface where the first refractive layer and the second refractive layer contact each other forms a functional interface with an inclination. The functional interface can be used to deflect the large-angle light emitted by the light emitting device, reduce the probability of total reflection of the light inside the display panel, and thus improve the light emitting efficiency of the light emitting device. In the embodiments of the present application, the first refractive layer does not need to use its own thickness to form a structure with an inclination, thereby liberating the restriction on the material of the first refractive layer and increasing the richness of the optional materials of the first refractive layer. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor.

[0018] Figure 1 A display panel schematic diagram provided by the embodiments of the present application;

[0019] Figure 2 Another display panel partial top view schematic diagram provided by the embodiments of the present application;

[0020] Figure 3 Another display panel partial top view schematic diagram provided by the embodiments of the present application; Figure 2 A cross-sectional schematic diagram at the tangent A-A` position;

[0021] Figure 4 Another display panel partial top view schematic diagram provided by the embodiments of the present application;

[0022] Figure 5 Another display panel partial top view schematic diagram provided by the embodiments of the present application; Figure 4 A cross-sectional schematic diagram at the tangent B-B` position;

[0023] Figure 6 Another display panel partial top view schematic diagram provided by the embodiments of the present application;

[0024] Figure 7 For Figure 6 A schematic view of a cross section at the tangent C-C` position;

[0025] Figure 8 Another schematic view of a display panel provided by an embodiment of the present application;

[0026] Figure 9 Another schematic view of a display panel provided by an embodiment of the present application;

[0027] Figure 10 Another schematic view of a display panel provided by an embodiment of the present application;

[0028] Figure 11 Another schematic view of a display panel provided by an embodiment of the present application;

[0029] Figure 12 Another schematic view of a display panel provided by an embodiment of the present application;

[0030] Figure 13 Another schematic view of a display panel provided by an embodiment of the present application;

[0031] Figure 14 Another schematic view of a display panel provided by an embodiment of the present application;

[0032] Figure 15 Another schematic view of a display panel provided by an embodiment of the present application;

[0033] Figure 16 Another schematic view of a display panel provided by an embodiment of the present application;

[0034] Figure 17 Another schematic view of a display panel provided by an embodiment of the present application;

[0035] Figure 18 Another schematic view of a display panel provided by an embodiment of the present application;

[0036] Figure 19 Another schematic view of a display panel provided by an embodiment of the present application;

[0037] Figure 20 Another schematic view of a display panel provided by an embodiment of the present application;

[0038] Figure 21 A schematic view of a display device provided by an embodiment of the present application;

[0039] Figure 22 A flow chart of a manufacturing method of a display panel provided by an embodiment of the present application. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0042] Figure 1 A schematic diagram of a display panel provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the display panel includes a substrate 10 , a display layer 20 and a light extraction layer 30 .

[0043] The display layer 20 is located on one side of the substrate 10; the display layer 20 includes a light-emitting device 21 and a pixel definition layer 22 located between adjacent light-emitting devices 21. The pixel definition layer 22 is used to separate adjacent light-emitting devices 21. The light-emitting device 21 is an organic light-emitting diode or an inorganic light-emitting diode. The light-emitting device 21 includes a stacked first electrode, a light-emitting layer, and a second electrode. An encapsulation layer 40 is provided on the side of the display layer 20 away from the substrate 10. The encapsulation layer 40 is used to isolate water and oxygen to ensure the service life of the light-emitting device 21. Optionally, the encapsulation layer 40 includes at least one inorganic layer and at least one organic layer. An array layer 50 is also provided between the display layer 20 and the substrate 10. The array layer 50 includes a pixel circuit, which is used to drive the light-emitting device 21 to emit light.

[0044] The light extraction layer 30 is located on the side of the display layer 20 away from the substrate 10. The light extraction layer 30 includes a stacked cushion layer 33, a first refractive layer 31, and a second refractive layer 32, with the first refractive layer 31 located between the cushion layer 33 and the second refractive layer 32. In some embodiments, a touch layer is further provided on the side of the display layer 20 away from the substrate 10 to enable the touch function of the display panel. Optionally, the touch layer is located on the side of the light extraction layer 30 closer to the substrate 10.

[0045] A protective layer is provided on a side of the light extraction layer 30 away from the substrate 10, and an optical adhesive layer is provided between the protective layer and the light extraction layer 30. The protective layer may be a rigid protective layer or a flexible protective layer.

[0046] The light extraction layer 30 is arranged in the light emitting direction of the light emitting device 21, and can improve the light emitting efficiency of the light emitting device 21. The light extraction layer 30 includes a stacked pad layer 33, a first refractive layer 31 and a second refractive layer 32. The pad layer 33 is arranged at the bottom of the stacked structure, and can adjust the shape of the first refractive layer 31. As shown in Figure 1 At the position of the circled area Q, the pad layer 33 forms a structure with an inclined angle. The first refractive layer 31 arranged above the pad layer 33 can also form an inclined structure (the inclined structure refers to the inclination relative to the plane of the substrate) according to the shape of the pad layer 33. In addition, the interface between the first refractive layer 31 and the second refractive layer 32 forms a functional interface with an inclination. The functional interface can deflect the large-angle light emitted by the light emitting device 21. After the action of the functional interface, the light is deflected to the normal direction of the display panel. The probability of total reflection of the light in the display panel is reduced, thereby improving the light emitting efficiency of the light emitting device 21. The normal direction is parallel to the direction e perpendicular to the plane of the substrate 10. In the embodiment, the first refractive layer 31 does not need to form a structure with an inclined angle by using its own thickness, thereby liberating the restriction on the material of the first refractive layer 31, and increasing the richness of the optional material of the first refractive layer 31.

[0047] In an embodiment, Figure 2 Another partial top view of a display panel is provided in the embodiment. Figure 3 For Figure 2 A cross-sectional view at the position of the tangent A-A' is shown in FIG. 3. For the sake of clarity, the structure of the light extraction layer 30 is shown. Figure 2 In FIG. 3, only the shape of the pad layer 33 and the light emitting device 21 are shown. Figure 2 In FIG. 3, the arrangement of the light emitting device 21 is only illustrative, and is not a limitation on the present application. The light emitting device 21 can be arranged in other forms. Figure 2 It can be seen that the pad layer 33 has an opening K, that is, the pad layer 33 is a patterned structure. Figure 2 In FIG. 3, the shape of the opening K is only illustrative. The shape of the opening K can be designed according to the shape of the light emitting device 21.

[0048] In combination with Figure 3As shown, in the direction e perpendicular to the plane of the substrate 10, the opening K overlaps with the light-emitting device 21. Also, the cushion layer 33 overlaps with the pixel definition layer 22. It can also be said that the cushion layer 33 is located obliquely above the light-emitting device 21. Since the cushion layer 33 has the opening K, the side wall B of the cushion layer 33 close to the light-emitting device 21 is inclined. The inclination of the side wall B means that a non-zero angle is formed between the side wall B and the plane parallel to the plane of the substrate 10, so as to form a structure with an inclined angle by using the shape of the cushion layer 33. Here, the side wall B is the inner wall of the opening K. In addition, in the embodiments of the present invention, the overlapping of the cushion layer 33 and the pixel definition layer 22 is understood as partial overlapping of the cushion layer 33 and the pixel definition layer 22; or, the cushion layer 33 completely overlaps with the pixel definition layer 22.

[0049] In the embodiments of the present invention, the first refractive layer 31 covers the upper surface and the side wall B of the cushion layer 33. The upper surface of the cushion layer 33 is the surface on the side away from the substrate 10. The first refractive layer 31 can also form an inclined structure adapting to the shape of the cushion layer 33, so that the first refractive layer 31 has a functional surface G, and the functional surface G has a first slope angle θ1, where θ1 < 90°. Figure 3 It is shown in the figure that the acute angle formed by the functional surface G and the plane perpendicular to the plane of the substrate 10 is the first slope angle θ1. The interface where the functional surface G contacts the second refractive layer 32 is a functional interface, and the functional interface can deflect the large-angle light emitted by the light-emitting device 21 to improve the light extraction efficiency of the light-emitting device 21. In the embodiments of the present invention, the first refractive layer 31 does not need to form a structure with an inclined angle by using its own thickness, thus liberating the material limitation of the first refractive layer 31 and increasing the richness of the optional materials for the first refractive layer 31.

[0050] In some embodiments, the refractive index of the first refractive layer 31 is n1, and the refractive index of the second refractive layer 32 is n2, where n1 < n2. That is, the refractive index of the first refractive layer 31 is less than the refractive index of the second refractive layer 32. When the large-angle light emitted by the light-emitting device 21 is incident from the first refractive layer 31 to the second refractive layer 32, the light travels from an optically thinner medium to an optically denser medium, so the incident angle is greater than the refraction angle. Compared with the incident light, the angle between the refracted light (such as Figure 3 the light S1 in the figure) entering the second refractive layer 32 and the direction e becomes smaller, that is, the light entering the second refractive layer 32 deflects towards the front view direction of the display panel, so as to reduce the probability of total internal reflection of the light inside the display panel and improve the light extraction efficiency of the light-emitting device 21. As shown in the optical path of the light S2, when the large-angle light emitted by the light-emitting device 21 is incident from the second refractive layer 32 to the first refractive layer 31, the light travels from an optically denser medium to an optically thinner medium, and total internal reflection can occur when the incident angle is greater than the critical angle. Compared with the incident light, the angle between the total internal reflection light and the direction e also becomes smaller, which can also improve the light extraction efficiency of the light-emitting device 21.

[0051] Figure 3 The embodiment is equivalent to disposing the pad layer 33 around the light emitting device 21, and the pad layers 33 corresponding to the adjacent light emitting devices 21 are connected to each other, and it can be considered that the pad layer 33 completely overlaps the pixel definition layer 22. In addition, in combination with Figure 2 , the pad layer 33 has the opening K, and the pad layer 33 is disposed in a surrounding manner in the four directions of the light emitting device 21, in other words, the pad layer 33 forms a closed figure in the direction surrounding the light emitting device 21. In another embodiment, the pad layer 33 overlaps the pixel definition layer 22, and the pad layer 33 has a gap in the direction surrounding the light emitting device 21.

[0052] In another embodiment, the pad layer 33 partially overlaps the pixel definition layer 22. Figure 4 Another partial top view schematic diagram of a display panel provided by an embodiment of the present application is shown in Figure 5 , and Figure 4 A cross-sectional view at the position of the tangent line B-B` is shown in Figure 4 , and Figure 5 In combination with , one pad layer 33 corresponds to one light emitting device 21, the pad layer 33 has the opening K, the opening K overlaps the light emitting device 21, and the pad layer 33 surrounding the light emitting device 21 is a structure isolated from each other. The first refractive layer 31 covers the pad layer 33, and the pattern shape of the first refractive layer 31 is the same as the shape of the pad layer 33.

[0053] Figure 3 , and Figure 5 The embodiment shows the case that the pad layer 33 overlaps the pixel definition layer 22. In another embodiment, the pad layer 33 overlaps the light emitting device 21. Figure 6 Another partial top view schematic diagram of a display panel provided by an embodiment of the present application is shown in Figure 7 , and Figure 6 A cross-sectional view at the position of the tangent line C-C` is shown in Figure 6 , and Figure 7 In combination with Figure 7 , in the direction e perpendicular to the plane where the substrate 10 is located, the pad layer 33 overlaps the light emitting device 21. In other words, the pad layer 33 is located directly above the light emitting device 21. One pad layer 33 corresponds to one light emitting device 21, and the adjacent pad layers 33 are isolated from each other. As shown in Figure 7 , the edge of the pad layer 33 forms a structure with an inclined angle, and the first refractive layer 31 is covered on the pad layer 33, so that the first refractive layer 31 forms the functional surface G, and the functional surface G has the first slope angle θ1.The functional surface G of the first refractive layer 31 forms an acute angle with a plane perpendicular to the substrate 10, and the acute angle is a first slope angle θ1. The refractive index of the first refractive layer 31 is n1, and the refractive index of the second refractive layer 32 is n2, and n1>n2. The large-angle light emitted by the light-emitting device 21 is emitted from the first refractive layer 31 to the second refractive layer 32, and the light is emitted from the dense medium to the sparse medium. The light is refracted on the functional interface formed by the functional surface G of the first refractive layer 31 and the second refractive layer 32, and the refraction angle is larger than the incidence angle. Compared with the incident light, the angle between the refracted light and the direction e is also smaller, thereby improving the light extraction efficiency of the light-emitting device 21. In this embodiment, the functional surface G of the first refractive layer 31 is in contact with the second refractive layer 32 to form a functional interface. When the light emitted by the light-emitting device 21 passes through the functional interface, the light is emitted from the dense medium to the sparse medium. After the action of the functional interface, the large-angle light is deflected to the normal direction of the display panel, and the probability of total reflection of the light in the display panel is reduced, thereby improving the light extraction efficiency of the light-emitting device 21. The shape of the pad layer 33 has an inclined angle structure, and the first refractive layer 31 does not need to use its own thickness to form a structure with an inclined angle, thereby liberating the restriction on the material of the first refractive layer 31 and increasing the richness of the optional materials of the first refractive layer 31.

[0054] The prior art includes a scheme in which a high-refractive-index material and a low-refractive-index material cooperate to improve the light extraction efficiency of a light-emitting device. The refractive index difference between the high-refractive-index material and the low-refractive-index material needs to satisfy a certain range. In the prior art scheme, the low-refractive-index material cannot be made lower, so the refractive index of the high-refractive-index material is also limited. In the prior art, the refractive index of the high-refractive-index material is greater than 1.6. The reflectivity of the high-refractive-index material is high, which leads to a large reflectivity of the high-refractive-index material to ambient light, thereby affecting the overall reflectivity of the display panel.

[0055] In some embodiments of the present application, the refractive index of the first refractive layer 31 is n1, and n1≤1.4. The refractive index of the second refractive layer 32 is n2, and n2≤1.6. In the embodiments of the present application, the shape of the first refractive layer 31 is adjusted by the pad layer 33, so the first refractive layer 31 can be made of a material with a lower refractive index. When the refractive index n1 of the first refractive layer 31 is less than or equal to 1.4, the refractive index n2 of the second refractive layer 32 can be set to be not greater than 1.6, while ensuring that the difference between the refractive index of the first refractive layer 31 and the refractive index of the second refractive layer 32 satisfies the design requirement. In this way, the surface refractive index of the high-refractive-index layer in the light extraction layer 30 can be reduced, and the reflectivity of the high-refractive-index layer can be reduced, thereby reducing the overall reflectivity of the display panel.

[0056] In some embodiments, the material of the first refractive layer 31 comprises an inorganic material. When the first refractive layer 31 is made by an inorganic film forming process, the thickness of the first refractive layer 31 is relatively thin, and the first refractive layer 31 can adapt to the shape of the cushion layer 33 to form an inclined structure. In addition, the use of inorganic materials can make the first refractive layer 31 have a lower refractive index, so that the refractive index of the first refractive layer 31 can be lower than the refractive index of a conventional low-refractive organic layer, without the need to develop an organic material with a lower refractive index. When the refractive index of the first refractive layer 31 is reduced, the refractive index of the second refractive layer 32 can also be appropriately reduced, provided that the difference between the refractive index of the first refractive layer 31 and the refractive index of the second refractive layer 32 meets the design requirements. The second refractive layer 32 is a surface film layer of the light extraction layer 30 away from the display layer 20. When the refractive index of the second refractive layer 32 is reduced, the surface reflectivity of the second refractive layer 32 can be reduced, thereby reducing the reflection of ambient light by the overall structure of the display panel and improving the display effect.

[0057] In some embodiments, the material of the first refractive layer 31 comprises one or more of silicon nitride, silicon oxynitride, silicon oxide, titanium oxide, or aluminum oxide.

[0058] In an embodiment, the material of the first refractive layer 31 comprises silicon oxide.

[0059] In embodiments of the present application, the material of the second refractive layer 32 comprises an organic material, so that the refractive index of the second refractive layer 32 is greater than the refractive index of the first refractive layer 31, and the interface between the first refractive layer 31 and the second refractive layer 32 forms a functional interface. In combination with the scheme in which the first refractive layer 31 comprises an inorganic material, the refractive index of the first refractive layer 31 is lower than the refractive index of a conventional low-refractive organic layer. When the difference between the refractive index of the first refractive layer 31 and the refractive index of the second refractive layer 32 meets the design requirements, the refractive index of the second refractive layer 32 can be reduced, thereby reducing the surface reflectivity of the second refractive layer 32, reducing the reflection of ambient light by the overall structure of the display panel, and improving the display effect.

[0060] In some embodiments, the material of the cushion layer 33 comprises an organic material. The thickness of the cushion layer 33 made of an organic material is relatively thick, which can facilitate the formation of a structure with an inclined angle.

[0061] In some embodiments, the refractive index of the cushion layer 33 is n3, and n1 < n3 ≤ n2. The refractive index of the cushion layer 33 is greater than the refractive index of the first refractive layer 31, and the refractive index of the cushion layer 33 is less than or equal to the refractive index of the second refractive layer 32. The material of the cushion layer 33 can be selected from a wider range.

[0062] In some embodiments, the material of the cushion layer 33 is the same as that of the second refractive layer 32 , which reduces the diversity of materials required for manufacturing the light extraction layer 30 and simplifies the manufacturing process.

[0063] In some embodiments, the materials of the cushion layer 33 and the second refractive layer 32 include, but are not limited to, acrylic resin, epoxy resin, phenolic resin, polyamide resin, or polyimide resin.

[0064] In some embodiments, the thickness of the first refractive layer 31 is less than the thickness of the cushion layer 33. In the display panel provided by the embodiment of the present invention, the shape of the first refractive layer 31 is adjusted by the shape of the cushion layer 33, so that the first refractive layer 31 forms an inclined structure, and the thickness of the first refractive layer 31 itself does not need to be made too thick.

[0065] In some embodiments, Figure 8 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 8 As shown, the pad layer 33 overlaps with the pixel definition layer 22, and the pad layer 33 has an opening K, which overlaps with the light-emitting device 21. The first refractive layer 31 includes a first subsection 31a and a second subsection 31b. The first subsection 31a covers at least a portion of the pad layer 33 on the side away from the substrate 10; in the direction e perpendicular to the plane of the substrate 10, the second subsection 31b overlaps with the light-emitting device 21. The first subsection 31a and the second subsection 31b are an integrated structure, that is, the first subsection 31a and the second subsection 31b are connected to each other, and the two can be manufactured in the same process. Figure 8 As shown, the side of the pad layer 33 proximal to the light-emitting device 21 has an inclined sidewall. The interface between the first portion 31a covering the inclined sidewall and the second refractive layer 32 serves as a functional interface. In this embodiment, the first refractive layer 31 does not need to be patterned to remove the second portion 31b during fabrication, simplifying the manufacturing process.

[0066] In some embodiments, the first refractive layer 31 is a whole-layer structure, that is, the first refractive layers 31 corresponding to adjacent light-emitting devices 21 are connected to each other.

[0067] In some embodiments, Figure 9 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 9As shown, the display panel also includes a color filter layer 60, which can reduce the reflectivity of the display panel. The color filter layer 60 is located between the display layer 20 and the light extraction layer 30. The color filter layer 60 includes a plurality of filter units 61; the filter units 61 include at least a red filter unit, a green filter unit, and a blue filter unit. The display panel also includes a black matrix BM. In the direction e perpendicular to the plane of the substrate 10, the black matrix BM overlaps with the pixel definition layer 22, and the filter units 61 overlap with the light-emitting device 21; wherein the second subsection 31b covers the filter units 61. The color filter layer 60 is located between the encapsulation layer 40 and the light extraction layer 30. The second subsection 31b is in contact with the filter units 61. The filter unit 61 comprises an organic material, while the first refractive layer 31 in the embodiment of the present invention comprises an inorganic material. The first refractive layer 31 and the filter unit 61 are manufactured using different processes. Therefore, when the second portion 31 b is covered on the filter unit 61, the second portion 31 b and the filter unit 61 will not dissolve each other and affect their respective performance.

[0068] In addition, if Figure 9 As shown, in a direction e perpendicular to the plane of the substrate 10, the second portion 31b of the first refractive layer 31 overlaps the light-emitting device 21, and the second refractive layer 32 overlaps the light-emitting device 21. In other words, the second refractive layer 32 covers the second portion 31b. In this embodiment of the present invention, the first refractive layer 31 comprises an inorganic material, and the second refractive layer 32 comprises an organic material. The first and second refractive layers 31, 32 comprise different materials. When the second refractive layer 32 is manufactured using a solvent coating process, the second refractive layer 32 and the first refractive layer 31 do not dissolve in each other during the manufacturing process, ensuring the stability of their respective performance. Furthermore, the first refractive layer 31 acts as a spacer between the filter unit 61 and the second refractive layer 32, preventing dissolution between the filter unit 61 and the second refractive layer 32. Furthermore, the solvent coating process for manufacturing the second refractive layer 32 facilitates a thinner thickness of the second refractive layer 32. When used in foldable display solutions, this helps improve the bendability of the display panel.

[0069] In some embodiments, Figure 10 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 10 As shown, the thickness D2 of the second section 31b is less than the thickness D1 of the first section 31a. In the embodiment of the present invention, the first refractive layer 31 comprises an inorganic material and is fabricated using an inorganic film-forming process, such as a chemical vapor deposition process. When the first refractive layer 31 is formed at the inclined sidewall of the cushion layer 33, the film thickness at this location is relatively thin due to process limitations, resulting in the thickness D2 of the second section 31b being less than the thickness D1 of the first section 31a.

[0070] like Figure 10As shown, the display panel includes a touch layer 70, which includes touch electrodes, providing the display panel with touch functionality. The touch layer 70 includes a touch metal layer and an insulating layer, with the touch electrodes located in the touch metal layer. An insulating layer is provided on the outer surface of the touch layer 70, away from the substrate 10, to protect the touch electrodes. The insulating layer is made of an inorganic material. Optionally, the insulating layer includes silicon nitride. In some embodiments, the second subsection 31b contacts the insulating layer in the touch layer 70. The material of the second subsection 31b includes silicon oxide. The refractive index of silicon nitride is greater than that of silicon oxide, resulting in a higher reflectivity of light at the interface where the second subsection 31b contacts the touch layer 70. Setting a smaller thickness D2 of the second subsection 31b, that is, reducing the thickness D2 of the second subsection 31b in contact with the touch layer 70, can reduce the reflectivity at the interface where the second subsection 31b contacts the touch layer 70 by utilizing the principle of thin film interference.

[0071] In some embodiments, Figure 11 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 11 As shown, the display panel further includes a color filter layer 60, which includes a plurality of filter units 61. In a direction e perpendicular to the plane of the substrate 10, the filter units 61 overlap with the light-emitting devices 21. The filter units 61 are multiplexed into the second refractive layer 32. The filter units 61 are made of an organic material, and their refractive index is lower than that of a conventional high-refractive-index organic layer. In other words, multiplexing the filter units 61 into the second refractive layer 32 can reduce the refractive index of the high-refractive-index layer in the light extraction layer 30, thereby reducing the surface reflectivity of the second refractive layer 32 and, consequently, the overall reflectivity of the display panel.

[0072] like Figure 11 As shown, the display panel further includes a black matrix BM, which overlaps with the pixel definition layer 22. A pad layer 33 covers the black matrix BM. Figure 11 The position of the black matrix BM is only schematically shown. In another embodiment, the black matrix BM is located on one side of the source / drain substrate 10 of the light extraction layer 30 , which is not shown in the figure here.

[0073] In some embodiments, Figure 12 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 12As shown, the filter unit includes a first filter unit 61a and a second filter unit 61b with different colors, wherein the refractive index of the first filter unit 61a is less than that of the second filter unit 61b. The first filter unit 61a overlaps the first light emitting device 21a, and the second filter unit 61b overlaps the second light emitting device 21b, and the light emitting colors of the first light emitting device 21a and the second light emitting device 21b are different. The refractive index of the first refractive layer 31 stacked with the first filter unit 61a is n 1-1 The refractive index of the first refractive layer 31 stacked with the second filter unit 61b is n 1-2 , wherein n 1-1 < n 1-2 In this embodiment, the refractive index of the first refractive layer 31 corresponding to the light emitting device with different colors can be designed differently. When the filter unit is multiplexed as the second refractive layer 32, the size of the first refractive layer 31 is adjusted according to the refractive index of the filter unit overlapping the first refractive layer 31, so that the difference in refractive index between the first refractive layer 31 and the filter unit satisfies the design requirements, and the first refractive layer 31 and the filter unit are in contact with each other to form a functional interface for improving the light emitting efficiency of the light emitting device.

[0074] In some embodiments, Figure 12 In the embodiment, the first light emitting device 21a is a red light emitting device, the first filter unit 61a is a red filter unit, the second light emitting device 21b is a green light emitting device, and the second filter unit 61b is a green filter unit.

[0075] In some other embodiments, Figure 12 In the embodiment, the first light emitting device 21a is a red light emitting device, the first filter unit 61a is a red filter unit, the second light emitting device 21b is a blue light emitting device, and the second filter unit 61b is a blue filter unit.

[0076] In some other embodiments, the refractive index relationship of the filter units corresponding to the red light emitting device, the green light emitting device and the blue light emitting device in the display panel is: the refractive index of the red filter unit > the refractive index of the green filter unit > the refractive index of the blue filter unit. The refractive index relationship of the first refractive layer 31 stacked with each filter unit is: the refractive index of the first refractive layer 31 stacked with the red filter unit > the refractive index of the first refractive layer 31 stacked with the green filter unit > the refractive index of the first refractive layer 31 stacked with the blue filter unit.

[0077] The above Figure 3 In the embodiment, the functional surface G of the first refractive layer 31 is a plane, and the included angle between the functional surface G and the pointing pad layer 33 formed by the plane parallel to the substrate 10 is a first slope angle θ1.

[0078] AsFigure 3 As shown in the figure, the cushion layer 33 includes a functional part 331, the thickness of the functional part 331 gradually increases from the center of the light emitting device 21 to the edge of the light emitting device 21; the first refractive layer 31 covering the functional part 331 at the position of the functional surface G. The functional part 331 has a second slope angle θ2, θ2<90°; the sidewall of the functional part 331 is inclined, wherein the sidewall is a plane, and the sidewall forms an angle with the plane parallel to the substrate 10, and the angle is the second slope angle θ2. The first refractive layer 31 covering the sidewall of the cushion layer 33 forms the planar functional surface G. The first slope angle θ1 of the functional surface G in the first refractive layer 31 and the second slope angle θ2 of the functional part 331 have a correlation.

[0079] In other embodiments, the functional surface G is a curved surface. Figure 13 Another schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 4. Figure 13 As shown in the figure, the first refractive layer 31 has a functional surface G, the functional surface G is in contact with the second refractive layer 32, the functional surface G is a curved surface, and the tangent plane of the functional surface G forms an angle with the plane parallel to the substrate 10, and the angle is the first slope angle θ1. Wherein, θ1<90°. In the embodiment of the present application, the shape of the first refractive layer 31 is adjusted by the cushion layer 33, the cushion layer 33 includes a functional part 331, the thickness of the functional part 331 gradually increases from the center of the light emitting device 21 to the edge of the light emitting device 21; the sidewall of the functional part 331 near the light emitting device 21 is inclined and curved, and the first refractive layer 31 covering the sidewall of the cushion layer 33 forms a curved functional surface G. The tangent plane of the sidewall forms an angle with the plane parallel to the substrate 10, and the angle is the second slope angle θ2, θ2<90°. Figure 13 The functional surface G is a convex surface protruding towards the inside of the second refractive layer 32 in the figure. In another embodiment, the functional surface G is a convex surface protruding away from the second refractive layer 32, which is not shown in the figure.

[0080] In the description of the following embodiments, the functional surface G of the first refractive layer 31 is still shown as a plane in the figure.

[0081] In some embodiments, Figure 14 Another schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 4. Figure 14 As shown in the figure, the light emitting device includes first and second light emitting devices 21a and 21b with different light emitting colors, the first refractive layer 31 includes first and second sub-refractive units 311 and 312, the first sub-refractive unit 311 is adjacent to the first light emitting device 21a, and the second sub-refractive unit 312 is adjacent to the second light emitting device 21b; the first slope angle of the first sub-refractive unit 311 is θ 1-1, the first slope angle of the second sub-refraction unit 312 is θ 1-2 , θ 1-1 <θ 1-2 In combination with the above Figure 3 , it is understood that the size of the first slope angle θ1 affects the effect of the functional interface on improving the light emitting efficiency of the light emitting device. The smaller the first slope angle θ1, the greater the effect on improving the light emitting efficiency of the light emitting device, that is, more light can be diverted to a greater extent to improve the light emitting efficiency of the light emitting device. In the embodiment of the present application, the size of the first slope angle in the first refraction layer 31 corresponding to different light emitting devices is designed differently, which can make the light emitting efficiency of the first light emitting device 21a improve to a greater extent than the light emitting efficiency of the second light emitting device 21b. When the service life of the first light emitting device 21a is short, its light emitting efficiency can be improved to appropriately reduce its light emitting brightness, thereby compensating for its low service life.

[0082] In some embodiments, the first light emitting device 21a is a blue light emitting device, and the second light emitting device 21b is a red light emitting device or a green light emitting device.

[0083] In another embodiment, the first slope angle corresponding to the green light emitting device is smaller than the first slope angle corresponding to the red light emitting device.

[0084] In another embodiment, the first slope angle corresponding to the green light emitting device is equal to the first slope angle corresponding to the red light emitting device.

[0085] As shown in Figure 14 , the second slope angle of the pad layer 33 stacked with the first sub-refraction unit 311 is θ 2-1 , the second slope angle of the pad layer 33 stacked with the second sub-refraction unit 312 is θ 2-2 , θ 2-1 <θ 2-2 The embodiment of the present application adjusts the structure of the first refraction layer 31 by using the pad layer 33, and the functional surface can be formed by covering the inclined side wall of the pad layer 33 on the pad layer 33. By setting θ 2-1 <θ 2-2 , θ 1-1 <θ 1-2 , thereby realizing the differential design of the size of the first slope angle in the first refraction layer 31 corresponding to different light emitting devices.

[0086] Figure 14 As shown in , the thickness of the pad layer 33 stacked with the first sub-refraction unit 311 is different from the thickness of the pad layer 33 stacked with the second sub-refraction unit 312, that is, the size of the second slope angle θ2 is adjusted by adjusting the thickness of the pad layer 33.

[0087] Figure 15Another display panel schematic diagram provided by the embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the display panel includes a substrate 10, a plurality of light emitting devices 21, a plurality of first sub-refraction units 311, and a plurality of second sub-refraction units 312. The plurality of light emitting devices 21 are arranged on the substrate 10. The plurality of first sub-refraction units 311 are arranged on the substrate 10 and are adjacent to the plurality of light emitting devices 21. The plurality of second sub-refraction units 312 are arranged on the substrate 10 and are adjacent to the plurality of light emitting devices 21. The plurality of first sub-refraction units 311 and the plurality of second sub-refraction units 312 are arranged in a staggered manner. Figure 15 As shown in FIG. 5, the thickness of the pad layer 33 stacked with the first sub-refraction unit 311 is substantially the same as the thickness of the pad layer 33 stacked with the second sub-refraction unit 312. The size of the second slope angle θ2 is adjusted by adjusting the inclination degree of the sidewall of the pad layer 33, so that θ 2-1 <θ 2-2 .

[0088] In another embodiment, Figure 16 Another display panel schematic diagram provided by the embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the display panel includes a substrate 10, a plurality of light emitting devices 21, a plurality of first sub-refraction units 311, and a plurality of second sub-refraction units 312. The plurality of light emitting devices 21 are arranged on the substrate 10. The plurality of first sub-refraction units 311 are arranged on the substrate 10 and are adjacent to the plurality of light emitting devices 21. The plurality of second sub-refraction units 312 are arranged on the substrate 10 and are adjacent to the plurality of light emitting devices 21. The plurality of first sub-refraction units 311 and the plurality of second sub-refraction units 312 are arranged in a staggered manner. Figure 16 As shown in FIG. 6, the pad layer 33 includes a functional part 331 and a third part 332 connected to each other. In the direction parallel to the plane of the substrate 10, the distance between the third part 332 and the light emitting device 21 is greater than the distance between the functional part 331 and the light emitting device 21. The first refraction layer 31 covers the functional part 331 and the third part 332. The thickness of the part of the first sub-refraction unit 311 covering the third part 332 is d1, and the thickness of the part of the second sub-refraction unit 312 covering the third part 332 is d2, where d1 < d2. In the embodiment of the present application, the first refraction layer 31 includes inorganic material. When the first refraction layer 31 is deposited into a film on the pad layer 33, the thickness of the first refraction layer 31 deposited at the inclined sidewall position of the functional part 331 affects the size of the first slope angle θ1. By setting d1 < d2, θ 1-1 <θ 1-2 , thereby realizing the differential design of the size of the first slope angle in the first refraction layer 31 corresponding to different light emitting devices.

[0089] In another embodiment, Figure 17 Another display panel schematic diagram provided by the embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the display panel includes a substrate 10, a plurality of light emitting devices 21, a plurality of first sub-refraction units 311, and a plurality of second sub-refraction units 312. The plurality of light emitting devices 21 are arranged on the substrate 10. The plurality of first sub-refraction units 311 are arranged on the substrate 10 and are adjacent to the plurality of light emitting devices 21. The plurality of second sub-refraction units 312 are arranged on the substrate 10 and are adjacent to the plurality of light emitting devices 21. The plurality of first sub-refraction units 311 and the plurality of second sub-refraction units 312 are arranged in a staggered manner. Figure 17 As shown in FIG. 6, the display area of the display panel includes a first display area AA1 and a second display area AA2. The light transmittance of the first display area AA1 is greater than the light transmittance of the second display area AA2. The density of the light emitting devices in the first display area AA1 is less than the density of the light emitting devices in the second display area AA2, or the size of the light emitting devices in the first display area AA1 is less than the size of the light emitting devices in the second display area AA2. The first sub-refraction unit 311 is adjacent to the first light emitting device 21a, and the first light emitting device 21a and the first sub-refraction unit 311 are located in the first display area AA1. The second sub-refraction unit 312 is adjacent to the second light emitting device 21b, and the second light emitting device 21b and the second sub-refraction unit 312 are located in the second display area AA2. The first slope angle of the first sub-refraction unit 311 is θ 1-1 , and the first slope angle of the second sub-refraction unit 312 is θ 1-2 , θ 1-1 <θ 1-2 . In this embodiment, θ1-1 <θ 1-2 , the light-emitting brightness of the first light-emitting device 21a can be improved, the brightness of the first display area AA1 is improved, and the brightness difference between the first display area AA1 and the second display area AA2 is reduced.

[0090] In some embodiments, as shown in FIG. 3, the second slope angle of the pad layer 33 stacked with the first sub-refraction unit 311 is θ Figure 17 2-1 The second slope angle of the pad layer 33 stacked with the second sub-refraction unit 312 is θ 2-2 2-1 <θ 2-2 The embodiment of the present application adjusts the structure of the first refraction layer 31 by using the pad layer 33, and the inclined side wall of the pad layer 33 can form a functional surface when the first refraction layer 31 is covered on the pad layer 33. By setting θ 2-1 <θ 2-2 , θ 1-1 <θ 1-2 , and θ 1-1 <θ 1-2 .

[0091] Figure 17 In the embodiment, the thickness of the pad layer 33 stacked with the first sub-refraction unit 311 is basically the same as the thickness of the pad layer 33 stacked with the second sub-refraction unit 312. The size of the second slope angle θ2 is adjusted by adjusting the inclination of the side wall of the pad layer 33, so that θ 2-1 <θ 2-2 .

[0092] In some other embodiments, the thickness of the pad layer 33 stacked with the first sub-refraction unit 311 is different from the thickness of the pad layer 33 stacked with the second sub-refraction unit 312. The size of the second slope angle θ2 is adjusted by adjusting the thickness of the pad layer 33, so that θ 2-1 <θ 2-2 This is not illustrated in the figure.

[0093] In some other embodiments, Figure 18 Another display panel provided by the embodiment of the present application is shown in FIG. 4, and the display panel is a display panel 40. The display panel 40 comprises a first display area AA1 and a second display area AA2. The first display area AA1 and the second display area AA2 are arranged in a staggered manner, and the first display area AA1 and the second display area AA2 are arranged in a staggered manner. Figure 18 ​​As shown, the cushion layer 33 includes a functional portion 331 and a third sub-portion 332 that are connected to each other. In the direction parallel to the plane of the substrate 10, the distance between the third sub-portion 332 and the light-emitting device 21 is greater than the distance between the functional portion 331 and the light-emitting device 21; the first refractive layer 31 covers the functional portion 331 and the third sub-portion 332; wherein, the thickness of the portion of the first sub-refractive unit 311 covering the third sub-portion 332 is d1, and the thickness of the portion of the second sub-refractive unit 312 covering the third sub-portion 332 is d2, where d1 < d2. Setting d1 < d2 can achieve θ 1-1 < θ 1-2 , and further achieve differential design of the magnitude of the first slope angle in the first refractive layer 31 corresponding to the light-emitting devices in the first display area AA1 and the second display area AA2.

[0094] In some embodiments, as Figure 8 shown, the second refractive layer 32 includes a fourth sub-portion 324 and a fifth sub-portion 325. In the direction e perpendicular to the plane of the substrate 10, it overlaps with the fourth sub-portion 324 and the light-emitting device 21, and the fifth sub-portion 325 overlaps with the pixel defining layer 22; the fourth sub-portion 324 and the adjacent fifth sub-portion 325 are both connected to each other. Then the second refractive layer 32 is a whole film layer covering the side of the first refractive layer 31 away from the substrate 10. During manufacturing, there is no need to perform patterning on the second refractive layer 32, which can simplify the process manufacturing, and the second refractive layer 32 can also play a certain flattening role.

[0095] In some embodiments, Figure 19 Another schematic diagram of a display panel provided by an embodiment of the present invention is shown as Figure 19 shown. The second refractive layer 32 includes a plurality of independent second refractive units 32y, and the pattern of the second refractive index unit 32y is the same as the pattern of the cushion layer 33. The first refractive layer 31 is a whole layer structure. A partial sub-portion of the first refractive layer 31 overlaps with the pixel defining layer 22 of the cushion layer, and a partial sub-portion of the first refractive layer 31 overlaps with the light-emitting device 21. In this embodiment, the second refractive layer 32 is a patterned structure. By using the cushion layer 33 to adjust the shape of the first refractive layer 31 and setting the pattern of the second refractive index unit 32y in the second refractive layer 32 to be the same as the pattern of the cushion layer 33, a functional interface can be formed at the interface where the second refractive index unit 32y contacts the first refractive layer 31, so as to turn the light emitted by the light-emitting device 21 using the functional interface, reduce the probability of total internal reflection of light inside the display panel, and improve the light extraction efficiency of the light-emitting device.

[0096] In other embodiments, Figure 20 Another schematic diagram of a display panel provided by an embodiment of the present invention is shown as Figure 20As shown, the second refractive layer 32 includes a plurality of mutually independent second refractive units 32y, and the first refractive layer 31 includes a plurality of mutually independent first refractive units 31y. The pattern of the second refractive units 32y is identical to that of the first refractive units 32y. In this embodiment, both the first refractive layer 31 and the second refractive layer 32 are patterned structures. The shape of the first refractive units 31y is adjusted using the cushion layer 33, and the pattern of the second refractive index units 32y is set to be identical to that of the first refractive units 31y. This allows a functional interface to be formed at the interface where the second refractive index units 32y contact the first refractive units 31y. This functional interface can be used to redirect light emitted by the light-emitting device 21, reducing the probability of total internal reflection of light within the display panel and improving the light extraction efficiency of the light-emitting device.

[0097] In some embodiments, as Figure 1 As shown, the refractive index of the first refractive layer 31 gradually decreases in a direction perpendicular to the plane of the substrate 10 and directed from the display layer 20 toward the light extraction layer 30. That is, the refractive index of the first refractive layer 31 gradually decreases along the light-emitting direction of the light-emitting device 21. This configuration results in a smaller refractive index for the first refractive layer 31 in contact with the second refractive layer 32. This creates a significant difference in refractive index across the interface between the first refractive layer 31 and the second refractive layer 32. This increases the difference between the refraction angle and the incident angle of light when it passes through the functional interface. After passing through the functional interface, the light is more deflected toward the normal viewing direction of the display panel, further reducing the probability of total internal reflection of the light within the display panel.

[0098] In some embodiments, the material of the first refractive layer 31 includes an inorganic material and is fabricated using an inorganic film-forming process. During fabrication, the refractive index of the first refractive layer 31 can be adjusted by adjusting the film-forming process conditions, such as adjusting the nitrogen / oxygen ratio in the raw materials. This allows the refractive index of the first refractive layer 31 to gradually decrease along the light-emitting direction of the light-emitting device 21.

[0099] In other embodiments, Figure 1 As shown, the refractive index of the second refractive layer 32 gradually decreases in a direction perpendicular to the plane of the substrate 10 and directed from the display layer 20 toward the light extraction layer 30. In other words, the refractive index of the second refractive layer 32 gradually decreases along the light emitting direction of the light emitting device 21. This allows the second refractive layer 32 in contact with the first refractive layer 31 to have a larger refractive index, resulting in a significant refractive index difference across the interface between the first refractive layer 31 and the second refractive layer 32.

[0100] In some embodiments of the present invention, the second refractive layer 32 includes an organic material and can be manufactured using a solution coating process. Doping nanoparticles into an organic material with a high refractive index can adjust the refractive index of the final second refractive layer 32 .

[0101] In some embodiments, the second refractive layer 32 is doped with nanoparticles. The smaller the particle size of the nanoparticles, the less impact they have on the refractive index of the second refractive layer 32. Along the light emitting direction of the light emitting device 21, the particle size of the nanoparticles doped in the second refractive layer 32 gradually decreases, which can cause the refractive index of the second refractive layer 32 to gradually decrease along the light emitting direction of the light emitting device 21.

[0102] In other embodiments, the second refractive layer 32 is doped with nanoparticles. The lower the doping density of the nanoparticles, the smaller the effect of the nanoparticles on the refractive index of the second refractive layer 32. Along the light emitting direction of the light emitting device 21, the doping density of the nanoparticles doped in the second refractive layer 32 gradually decreases, which can cause the refractive index of the second refractive layer 32 to gradually decrease along the light emitting direction of the light emitting device 21.

[0103] In other embodiments, the second refractive layer 32 is doped with nanoparticles, and the portion of the second refractive layer 32 in contact with the first refractive layer 31 and the portion of the second refractive layer 32 away from the first refractive layer 31 are doped with different types of nanoparticles, and the different types of nanoparticles themselves have different refractive indices, thereby enabling the refractive index of the second refractive layer 32 to gradually decrease along the light emitting direction of the light emitting device 21.

[0104] Based on the same inventive concept, an embodiment of the present invention further provides a display device, Figure 21 A schematic diagram of a display device provided by an embodiment of the present invention is shown in FIG. Figure 21 As shown, the display device includes a display panel 100 provided by any embodiment of the present invention. The structure of the display panel 100 has been described in the above-mentioned display panel embodiment and will not be repeated here. The display device provided by the embodiment of the present invention can be, for example, an electronic device such as a mobile phone, a computer, a television, an in-vehicle display, or a smart wearable device.

[0105] Based on the same inventive concept, an embodiment of the present invention further provides a method for manufacturing a display panel, which can be used to manufacture the display panel provided by any embodiment of the present invention. The display panel embodiment and the display panel manufacturing method embodiment can be understood by reference to each other.

[0106] Figure 22 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention is shown in FIG. Figure 22 As shown, the production method includes:

[0107] Step S101: forming a substrate 10;

[0108] Step S102: forming a display layer 20, the display layer 20 is located on the substrate 10, the display layer 20 includes a light emitting device 21 and a pixel definition layer 22 located between adjacent light emitting devices 21;

[0109] Step S103: making a cushion layer 33, the cushion layer 33 is located on the display layer 20;

[0110] Step S104: using an inorganic film forming process to make a first refractive layer 31 on the cushion layer 33;

[0111] Step S105: providing a raw material for forming a second refractive layer 32, mixing the raw material with a solvent to obtain a mixed solution;

[0112] Step S106: coating the mixed solution on the side of the first refractive layer 31 away from the substrate 10 to form the second refractive layer 32.

[0113] The cushion layer 33, the first refractive layer 31, and the second refractive layer 32 stacked in the embodiment of the present application together constitute a light extraction layer 30, which can improve the light extraction efficiency of the light emitting device 21. The cushion layer 33 can process the shape of the first refractive layer 31. The first refractive layer 31 is made by an inorganic film forming process, and the second refractive layer 32 is made by a solution coating process. In the film forming process of the second refractive layer 32, the first refractive layer 31 can isolate and protect the film layer below it, preventing the solvent in the mixed solution from penetrating into the film layer below, causing mutual solubility. In addition, the second refractive layer 32 is made by a solution coating process, which can make the thickness of the second refractive layer 32 relatively thin compared with the scheme of making a refractive layer by a solvent-free process, which is beneficial to improving the bending performance of the display panel in the foldable display scheme.

[0114] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

[0115] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized by, The display panel includes: substrate; A display layer is located on one side of the substrate; the display layer includes light-emitting devices and a pixel definition layer located between adjacent light-emitting devices; a light extraction layer located on a side of the display layer away from the substrate; the light extraction layer comprises a stacked cushion layer, a first refractive layer, and a second refractive layer, wherein the first refractive layer is located between the cushion layer and the second refractive layer; The first refractive layer has a functional surface, the functional surface contacts the second refractive layer, and the functional surface has a first slope angle θ1, θ1<90°; wherein, The functional surface is a plane, and the angle formed by the functional surface and the plane parallel to the substrate pointing to the pad layer is the first slope angle; or the functional surface is a curved surface, and the angle formed by the tangent plane of the functional surface and the plane parallel to the substrate pointing to the pad layer is the first slope angle.

2. The display panel according to claim 1, wherein: The pad layer overlaps the pixel definition layer.

3. The display panel according to claim 1, wherein: The refractive index of the first refractive layer is n1, the refractive index of the second refractive layer is n2, and n1<n2.

4. The display panel according to claim 1, wherein: The material of the first refractive layer includes inorganic material.

5. The display panel according to claim 4, wherein: The first refractive layer includes a silicon oxide layer.

6. The display panel according to claim 1, wherein: The refractive index of the first refractive layer is n1, and n1≤1.

4.

7. The display panel according to claim 1, wherein: The material of the second refractive layer includes organic material.

8. The display panel according to claim 1, wherein: The refractive index of the second refractive layer is n2, and n2≤1.

6.

9. The display panel according to claim 1, wherein: The material of the underlayer includes organic material.

10. The display panel according to claim 3, wherein: The refractive index of the cushion layer is n3, n1< n3≤ n2.

11. The display panel according to claim 10, wherein: The material of the cushion layer is the same as that of the second refractive layer.

12. The display panel according to claim 1, wherein The thickness of the first refractive layer is smaller than the thickness of the cushion layer.

13. The display panel according to claim 1, wherein The pad layer has an opening, and the opening overlaps with the light emitting device.

14. The display panel according to claim 1, wherein The sidewall of the cushion layer close to the light emitting device is inclined, and the first refractive layer covers the upper surface and the sidewall of the cushion layer.

15. The display panel according to claim 1, wherein The first refractive layer includes a first portion and a second portion, wherein the first portion covers at least a portion of the cushion layer on a side of the cushion layer away from the substrate; The second section overlaps with the light emitting device; wherein the first section and the second section are an integrated structure.

16. The display panel of claim 15, wherein the display panel further comprises a color filter layer between the display layer and the light extraction layer, the color filter layer comprising a plurality of filter units; the filter units overlapping the light emitting devices; the second sub-section covers the filter units.

17. The display panel of claim 15, wherein a thickness of the second sub-section is less than a thickness of the first sub-section.

18. The display panel of claim 1, wherein the display panel further comprises a color filter layer, the color filter layer comprising a plurality of filter units; the filter units overlapping the light emitting devices; the filter units are multiplexed as the second refractive layer.

19. The display panel of claim 18, wherein the filter units comprise first filter units and second filter units of different colors, a refractive index of the first filter units being less than a refractive index of the second filter units. The refractive index of the first refractive layer mutually stacked with the first filter unit is n 1-1 The refractive index of the first refractive layer mutually stacked with the second filter unit is n 1-2 wherein n 1-1 < n 1-2 .

20. The display panel of claim 1, wherein the light emitting devices comprise first light emitting devices and second light emitting devices, the first refractive layer comprising first sub-refractive units and second sub-refractive units, the first sub-refractive units being adjacent to the first light emitting devices, the second sub-refractive units being adjacent to the second light emitting devices; The first slope angle of the first sub-refraction unit is θ 1-1 The first slope angle of the second sub-refraction unit is θ 1-2 θ 1-1 < θ 1-2 ; wherein the first light emitting devices and the second light emitting devices are of different light emitting colors.

21. The display panel of claim 1, wherein the light emitting devices comprise first light emitting devices and second light emitting devices, the first refractive layer comprising first sub-refractive units and second sub-refractive units, the first sub-refractive units being adjacent to the first light emitting devices, the second sub-refractive units being adjacent to the second light emitting devices; The first slope angle of the first sub-refraction unit is θ 1-1 The first slope angle of the second sub-refraction unit is θ 1-2 θ 1-1 < θ 1-2 ; a display area of the display panel comprises a first display area and a second display area, a light transmittance of the first display area being greater than a light transmittance of the second display area; wherein the first light emitting devices and the first sub-refractive units are located in the first display area, the second light emitting devices and the second sub-refractive units are located in the second display area.

22. The display panel of claim 20 or 21, wherein the cushion layer comprises a functional sub-section and a third sub-section connected to each other, in a direction parallel to a plane on which the substrate lies, the third sub-section is farther away from the light emitting device than the functional sub-section; in a direction from a center of the light emitting device to an edge of the light emitting device, a thickness of the functional sub-section gradually increases; the first refractive layer covers the functional sub-section and the third sub-section; wherein a thickness of a portion of the first sub-refractive units covering the third sub-section is d1, a thickness of a portion of the second sub-refractive units covering the third sub-section is d2, wherein d1 < d2.

23. The display panel of claim 20 or 21, wherein The pad layer comprises a functional portion, which gradually increases in thickness from the center of the light emitting device to the edge of the light emitting device; the first refractive layer covering the functional portion at the position of the functional surface; The functional portion has a second slope angle θ2, θ2<90°; the sidewall of the functional portion is inclined; wherein the sidewall is a plane, and the sidewall forms an included angle with a plane parallel to the substrate and pointing to the pad layer, and the included angle is the second slope angle; or the sidewall is a curved surface, and the tangent plane of the sidewall forms an included angle with a plane parallel to the substrate and pointing to the pad layer, and the included angle is the second slope angle; the second slope angle of the spacer layer stacked with the first sub-refraction unit is θ 2-1 the second slope angle of the spacer layer stacked with the second sub-refraction unit is θ 2-2 θ 2-1 < θ 2-2 .

24. The display panel of claim 1, wherein The second refractive layer comprises a fourth sub-portion and a fifth sub-portion, the fourth sub-portion overlaps the light emitting device, and the fifth sub-portion overlaps the pixel definition layer; The fourth sub-portion and the fifth sub-portion adjacent to the fourth sub-portion are connected to each other.

25. The display panel of claim 1, wherein The second refractive layer comprises a plurality of second refractive units independent of each other, and the pattern of the second refractive units is the same as the pattern of the pad layer; or the first refractive layer comprises a plurality of first refractive units independent of each other, and the pattern of the second refractive units is the same as the pattern of the first refractive units.

26. The display panel of claim 1, wherein In a direction perpendicular to the plane in which the substrate is located and pointing from the display layer to the light extraction layer, the refractive index of the first refractive layer gradually decreases.

27. The display panel of claim 1, wherein In a direction perpendicular to the plane in which the substrate is located and pointing from the display layer to the light extraction layer, the refractive index of the second refractive layer gradually decreases. The display panel of any one of claims 1 to 27.

28. A display device comprising: The manufacturing method comprises:

29. A method for manufacturing a display panel, comprising: forming a substrate; forming a display layer on the substrate, the display layer comprising light emitting devices and pixel definition layers located between adjacent light emitting devices; forming a pad layer on the display layer; forming a first refractive layer on the pad layer by using an inorganic film forming process; the first refractive layer has a functional surface, the functional surface has a first slope angle θ1, θ1<90°; wherein the functional surface is a plane, and the functional surface forms an included angle with a plane parallel to the substrate and pointing to the pad layer, and the included angle is the first slope angle; or the functional surface is a curved surface, and the tangent plane of the functional surface forms an included angle with a plane parallel to the substrate and pointing to the pad layer, and the included angle is the first slope angle; providing a raw material for forming a second refractive layer, mixing the raw material with a solvent to obtain a mixed solution; coating the mixed solution on the side of the first refractive layer away from the substrate to form the second refractive layer, and the functional surface is in contact with the second refractive layer. ​

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