Display panel and display device

Abstract

Embodiments of the present invention provide a display panel and a display device. The display panel includes: a substrate; a light-emitting device layer located on one side of the substrate; the light-emitting device layer includes a plurality of light-emitting devices; a light extraction layer located on a side of the light-emitting device layer away from the substrate; the light extraction layer includes a first refractive index unit and a second refractive index unit with different refractive indices; in a direction perpendicular to the plane of the substrate, the first refractive index unit overlaps with the light-emitting device; the first refractive index unit includes a central portion and a functional portion surrounding the central portion, and the thickness of the functional portion gradually changes in a direction from the central portion to the functional portion; the second refractive index unit is located on a side of the first refractive index unit away from the substrate, and the second refractive index unit at least covers the functional portion. The present invention can improve the light extraction efficiency of the light-emitting device.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode), an organic light-emitting diode, has the characteristic of self-luminescence. When used in the display field, it does not require an additional light source, which is conducive to the overall thinness of the display device and can realize the production of flexible display screens. OLED display panels also have the advantages of high brightness, low power consumption, fast response, high clarity, good flexibility, and high luminous efficiency, which can meet consumers' new demands 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 confined to the inside of the display panel and cannot be emitted from the display panel to contribute to the pixel light emission, affecting the overall light output efficiency of the light-emitting device. Summary of the Invention

[0003] Embodiments of the present invention provide a display panel and a display device to solve the technical problem of improving the light extraction efficiency of a light emitting device.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, comprising:

[0005] substrate;

[0006] A light-emitting device layer is located on one side of the substrate; the light-emitting device layer includes a plurality of light-emitting devices;

[0007] The light extraction layer is located on the side of the light emitting device layer away from the substrate; the light extraction layer includes a first refractive index unit and a second refractive index unit with different refractive indices; wherein,

[0008] The first refractive index unit overlaps with the light-emitting device in a direction perpendicular to the plane of the substrate; the first refractive index unit includes a central portion and a functional portion surrounding the central portion, and the thickness of the functional portion gradually changes in a direction from the central portion to the functional portion;

[0009] The second refractive index unit is located on a side of the first refractive index unit away from the substrate, and the second refractive index unit at least covers the functional part.

[0010] In a second aspect, based on the same inventive concept, an embodiment of the present invention further provides a display device, comprising the display panel provided by any embodiment of the present invention.

[0011] The display panel and display device provided by the embodiments of the present invention have the following beneficial effects: a light extraction layer is provided on the side of the light-emitting device away from the substrate. The first refractive index unit in the light extraction layer overlaps with the light-emitting device, and the first refractive index unit includes a central portion and a functional portion. The thickness of the functional portion gradually changes in the direction from the central portion to the functional portion, and the second refractive index unit covers the functional portion. The large refractive index relationship between the first refractive index unit and the second refractive index unit cooperates with the thickness change of the functional portion, so that the interface where the functional portion and the second refractive index unit contact each other forms a functional interface. When part of the large-angle light emitted by the light-emitting device enters the second refractive index unit through the functional portion, it will be refracted at the interface where the two contact. The refracted light will be deflected toward the normal viewing direction of the display panel, so that the angle between the light and the normal viewing direction becomes smaller, which can increase the probability of light being emitted from the display panel, thereby improving the light extraction efficiency of the light-emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0013] Figure 1 A partial schematic diagram of a display panel provided by an embodiment of the present invention;

[0014] Figure 2 for Figure 1 A schematic diagram of a cross section at the mid-tangent line A-A';

[0015] Figure 3 A schematic diagram of another display panel provided by an embodiment of the present invention;

[0016] Figure 4 Schematic diagrams of other display panels provided by embodiments of the present invention;

[0017] Figure 5 A schematic diagram of another display panel provided by an embodiment of the present invention;

[0018] Figure 6 A schematic diagram of another display panel provided by an embodiment of the present invention;

[0019] Figure 7 A schematic diagram of another display panel provided by an embodiment of the present invention;

[0020] Figure 8 A schematic diagram of another display panel provided by an embodiment of the present invention;

[0021] Figure 9A schematic diagram of another display panel provided by an embodiment of the present invention;

[0022] Figure 10 A schematic diagram of another display panel provided by an embodiment of the present invention;

[0023] Figure 11 for Figure 10 A schematic cross-sectional view at the midline BB';

[0024] Figure 12 A schematic diagram of another display panel provided by an embodiment of the present invention;

[0025] Figure 13 Schematic diagrams of other display panels provided by embodiments of the present invention;

[0026] Figure 14 A partial schematic diagram of another display panel provided by an embodiment of the present invention;

[0027] Figure 15 A partial schematic diagram of another display panel provided by an embodiment of the present invention;

[0028] Figure 16 for Figure 10 Another cross-sectional view at the midline BB';

[0029] Figure 17 A partial schematic diagram of another display panel provided by an embodiment of the present invention;

[0030] Figure 18 for Figure 10 Another cross-sectional view at the midline BB';

[0031] Figure 19 A schematic diagram of another display panel provided by an embodiment of the present invention;

[0032] Figure 20 A schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a display panel, in which a light extraction layer is arranged on the light-emitting side of the light-emitting device in the display panel, and a functional interface formed between refractive units with different refractive indices in the light extraction layer is used to deflect large-angle light, so as to reduce the angle between the light after the deflection and the normal viewing direction of the display panel, thereby increasing the probability of light being emitted from the display panel and improving the light extraction efficiency of the light-emitting device.

[0036] Figure 1 A partial schematic diagram of a display panel provided by an embodiment of the present invention, Figure 2 for Figure 1 A schematic cross-sectional view at the midline AA'. Figure 3 A schematic diagram of another display panel provided by an embodiment of the present invention.

[0037] Combine Figure 1 and Figure 2 To understand the structure of the display panel provided by the embodiment of the present invention, Figure 1 Only the first refractive index unit 31 in the light extraction layer 30 is shown. Figure 1 The first refractive index unit 31 in the top view is a graphical structure. The shape of the first refractive index unit 31 is schematically shown and does not limit the present invention. Specifically, the shape of the first refractive index unit 31 can be designed according to the shape of the light-emitting device in the display panel.

[0038] like Figure 2 As shown, the display panel includes a substrate 10, a light-emitting device layer 20, and a light extraction layer 30. The light-emitting device layer 20 is located on one side of the substrate 10 and includes a plurality of light-emitting devices 21 and a pixel-defining layer 22. The pixel-defining layer 22 is used to separate adjacent light-emitting devices 21. The light-emitting devices 21 are organic light-emitting diodes or inorganic light-emitting diodes. Figure 2The light-emitting device 21 is only simplified in the figure. Optionally, the light-emitting device 21 includes a first electrode, a light-emitting layer, and a second electrode that are stacked. The display panel also includes a pixel circuit located between the substrate 10 and the light-emitting device layer 20. The pixel circuit is coupled to the light-emitting device 21, and the pixel circuit is used to drive the light-emitting device 21 to emit light. An encapsulation layer 40 is also provided on the side of the light-emitting device layer 20 away from the substrate 10. The encapsulation layer 40 is used to encapsulate the light-emitting device 21 to isolate water and oxygen and ensure the service life of the light-emitting device 21. In some embodiments, the encapsulation layer 40 is a rigid encapsulation, and the encapsulation layer 40 includes encapsulation glass. In other embodiments, the encapsulation layer 40 is a flexible encapsulation, and the encapsulation layer 40 includes at least one inorganic encapsulation layer and at least one organic encapsulation layer.

[0039] The light extraction layer 30 is located on a side of the light emitting device layer 20 away from the substrate 10 ; the light extraction layer 30 includes a first refractive index unit 31 and a second refractive index unit 32 with different refractive indices.

[0040] In the direction e perpendicular to the plane of the substrate 10, the first refractive index unit 31 overlaps with the light emitting device 21; the first refractive index unit 31 includes a central portion 31a and a functional portion 31b. Figure 1 It can be seen that the functional portion 31 b surrounds the central portion 31 a.

[0041] The second refractive index unit 32 is located on a side of the first refractive index unit 31 away from the substrate 10 and covers at least the functional portion 31b. The thickness of the functional portion 31b gradually changes from the central portion 31a to the functional portion 31b. Figure 2 As shown in FIG. 3 , the thickness of the functional portion 31b gradually decreases in the direction from the center portion 31a to the functional portion 31b. In other words, the thickness of the functional portion 31b gradually decreases in the direction parallel to the plane of the substrate 10 and from the center of the light emitting device 21 to the edge of the light emitting device 21. In another embodiment, as Figure 3 As shown, the thickness of the functional portion 31 b gradually increases from the central portion 31 a toward the functional portion 31 b. Figure 3 In the embodiment, the surrounding relationship between the functional portion 31b and the central portion 31a can be referred to Figure 1 Understand.

[0042] exist Figure 2In the embodiment, the thickness of the functional portion 31b gradually decreases in the direction from the central portion 31a to the functional portion 31b, and the refractive index of the first refractive index unit 31 is set to be greater than the refractive index of the second refractive index unit 32. Part of the large-angle light emitted by the light-emitting device 21 will first hit the functional portion 31b, and then enter the second refractive index unit 32 through the functional portion 31b, and the light will be refracted at the interface where the functional portion 31b and the second refractive index unit 32 contact. Large-angle light refers to light emitted by the light-emitting device 21 with a large angle between it and the normal viewing direction of the display panel. The normal viewing direction when the user uses the display panel is the direction perpendicular to the display panel. It can be understood that the normal viewing direction is parallel to the direction e perpendicular to the plane where the substrate 10 is located. When the light emitted by the light-emitting device 21 propagates along the direction e perpendicular to the plane where the substrate 10 is located, the angle between the light and the normal viewing direction is 0. According to the law of refraction of light, when light is incident from a denser medium into a beam medium, the angle of incidence is less than the angle of refraction. Then Figure 2 In the embodiment, large-angle light is incident on the second refractive index unit 32 through the functional portion 31b and then refracted, and the propagation direction of the light is deflected toward the normal viewing direction of the display panel, so that the angle between the light and the normal viewing direction becomes smaller, which can increase the probability of light being emitted from the display panel, thereby improving the light extraction efficiency of the light-emitting device 21.

[0043] exist Figure 3 In the embodiment, the thickness of the functional portion 31b gradually increases from the central portion 31a toward the functional portion 31b, and the refractive index of the first refractive index unit 31 is set to be smaller than the refractive index of the second refractive index unit 32. When part of the large-angle light emitted by the light-emitting device 21 enters the second refractive index unit 32 through the functional portion 31b, the light will be refracted at the interface between the functional portion 31b and the second refractive index unit 32. At this time, the light enters the denser medium from the less optically dense medium, and the incident angle is greater than the refraction angle. Figure 3 As shown in the embodiment, large-angle light is incident on the second refractive index unit 32 through the functional part 31b and then refracted. The propagation direction of the light will be deflected toward the normal viewing direction of the display panel, so that the angle between the light and the normal viewing direction becomes smaller, which can increase the probability of light being emitted from the display panel, thereby improving the light output efficiency of the light-emitting device 21.

[0044] In a display panel provided by an embodiment of the present invention, a light extraction layer 30 is disposed on the side of the light-emitting device 21 away from the substrate 10. In the light extraction layer 30, a first refractive index unit 31 overlaps the light-emitting device 21. The first refractive index unit 31 includes a central portion 31a and a functional portion 31b. The thickness of the functional portion 31b gradually changes from the central portion 31a toward the functional portion 31b. Second refractive index units 32 cover the functional portion 31b. The relationship between the refractive indices of the first and second refractive index units 31 and 32, combined with the thickness variation of the functional portion 31b, creates a functional interface at the interface between the functional portion 31b and the second refractive index unit 32. When a portion of high-angle light emitted by the light-emitting device 21 passes through the functional portion 31b and enters the second refractive index unit 32, it is refracted at the interface. The refracted light is deflected toward the normal viewing direction of the display panel, reducing the angle between the light and the normal viewing direction. This increases the probability of light exiting the display panel, thereby improving the light extraction efficiency of the light-emitting device 21.

[0045] In the embodiments of the present invention, the relationship between the refractive indices of the first refractive index unit 31 and the second refractive index unit 32 is coordinated with the thickness variation of the functional portion 31b, so that the interface between the functional portion 31b and the second refractive index unit 32 forms a functional interface. The following first describes some embodiments in which the refractive index of the first refractive index unit 31 is greater than the refractive index of the second refractive index unit 32, and the thickness of the functional portion 31b gradually decreases from the central portion 31a toward the functional portion 31b.

[0046] In some embodiments, Figure 4 Schematic diagrams of other display panels provided by embodiments of the present invention, such as Figure 4 As shown, the display panel includes a color resist layer 50, which includes color resist units 51. The color resist layer 50 is located on a side of the light extraction layer 30 away from the light-emitting device layer 20. The refractive index of the first refractive index unit 31 is greater than the refractive index of the second refractive index unit 32. The display panel also includes a black matrix 60, which has a first opening K1. In a direction e perpendicular to the plane of the substrate 10, the first opening K1 overlaps with the light-emitting device 21, and the black matrix 60 overlaps with the pixel-defining layer 22. Figure 4The position of the black matrix 60 is only schematically indicated. In an embodiment of the present invention, the color resist unit 51 includes at least a red color resist unit, a green color resist unit and a blue color resist unit. The color resist unit 51 has a filtering function, which can allow light of a specific color to pass through and filter out light of other colors except the specific color. For example, the red color resist unit can allow red light to pass through. In the application, the red light in the ambient light can penetrate the red color resist unit, and after the red light is reflected by the structure below the red color resist unit, it cannot be emitted by the adjacent color resist units of other colors, and the reflected light is confined to the inside of the panel and cannot be emitted, thereby reducing the reflectivity of the display panel to the ambient light. The color resist layer 50 in the embodiment of the present invention is equivalent to an anti-reflection layer, which has the function of reducing the reflection of the display panel to the ambient light, and can improve the display effect of the display panel.

[0047] exist Figure 4 In an embodiment, the refractive index of the color resist unit 51 is less than the refractive index of the first refractive index unit 31. That is, the refractive index of the color resist unit 51 is less than the refractive index of the high-refractive material in the light extraction layer 30. In a display panel including the color resist layer 50 and the light extraction layer 30, the light extraction layer 30 can be used to improve the light extraction efficiency of the light-emitting device 21, and the color resist layer 50 can be used to reduce the reflectivity of the display panel to ambient light. In addition, the color resist unit 51 is arranged on the side of the light extraction layer 30 away from the substrate 10. Then, in the module structure in which the light extraction layer 30 and the color resist layer 50 are stacked, the film layer with a smaller refractive index is located at the outermost side of the module structure, which can reduce the refractive index difference between the module structure and the film layer above it (such as optical glue or protective cover), thereby reducing the surface reflectivity of the outer surface of the module structure, thereby further reducing the reflectivity of the display panel to ambient light and improving the display effect.

[0048] In an embodiment of the present invention, the first refractive index unit 31 is a patterned structure that overlaps the light-emitting device 21 and is covered by the second refractive index unit 32. From the perspective of the display panel as a whole, in some embodiments, the second refractive index unit 32 is a continuous layer that covers multiple first refractive index units 31. This provides a relatively flat substrate for the fabrication of film layers above the light extraction layer 30. In other embodiments, the second refractive index unit 32 is a patterned structure that covers at least the functional portion 31b of the first refractive index unit 31.

[0049] In the embodiment of the present invention, Figure 2 or Figure 3As shown, the pixel defining layer 22 has a second opening, and the light-emitting device 21 is located in the second opening; the second opening is not marked in the figure, but the side wall 22B of the second opening is marked. In the direction e perpendicular to the plane of the substrate 10, at least part of the functional portion 31b overlaps with the side wall 22B. Such an arrangement can ensure that the large-angle light emitted by the light-emitting device 21 can be irradiated on the interface where the functional portion 31b and the second refractive index unit 32 contact each other, so as to utilize the interface where the functional portion 31b and the second refractive index unit 32 contact each other to refract the large-angle light, so that the refracted light is deflected in the normal viewing direction of the display panel, thereby improving the light extraction efficiency of the light-emitting device 21.

[0050] In another embodiment, Figure 5 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 5 As shown, the display panel includes a color resist unit 51; the second refractive index unit 32 is multiplexed into the color resist unit 51. The refractive index of the first refractive index unit 31 is greater than that of the second refractive index unit 32. In other words, the color resist unit 51 is multiplexed into a low refractive index layer within the light extraction layer 30. In this embodiment, the second refractive index unit 32 cooperates with the first refractive index unit 31 to improve the light extraction efficiency of the light-emitting device 21. Furthermore, the second refractive index unit 32 has light filtering properties, which can be used to reduce the display panel's reflection of ambient light. This embodiment integrates the structure that improves the light extraction efficiency of the light-emitting device 21 with the structure that reduces the display panel's reflectivity, reducing the thickness of the display panel module and improving its overall flexibility. Furthermore, in this embodiment, the refractive index of the color resist unit 51 is lower than that of the first refractive index unit 31. The color resist unit 51 is located at the outermost edge of the integrated module structure, minimizing the refractive index difference between the module structure and the film layer above it. This reduces the surface reflectivity of the module structure's outer surface, further reducing the display panel's reflectivity of ambient light and improving the display quality.

[0051] like Figure 5 As shown, the black matrix 60 is located on the side of the light-emitting device layer 20 away from the substrate 10, and the first refractive index unit 31 is located in the first opening K1 of the black matrix 60. The second refractive index unit 32, that is, the color resist unit 51, is at least partially located in the first opening K1. The black matrix 60 can act as a spacer between adjacent second refractive index units 32. The black matrix 60 overlaps with the pixel defining layer 22. The black matrix 60 can also shield the metal structure located below it from light, preventing the metal structure from reflecting ambient light, thereby further reducing the reflectivity of the display panel to ambient light.

[0052] In another embodiment, Figure 6 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 6As shown, the second refractive index unit 32 is multiplexed into the color resist unit 51, the first refractive index unit 31 is located in the first opening K1, and a transparent medium structure 70 is provided between the first refractive index unit 31 and the black matrix 60, and the second refractive index unit 32 covers the transparent medium structure 70. Optionally, the transparent medium structure 70 includes optical glue. In this embodiment, the second refractive index unit 32 cooperates with the first refractive index unit 31 to improve the light extraction efficiency of the light-emitting device 21, and the second refractive index unit 32 also has a filtering function to reduce the reflectivity of the display panel to ambient light. The transparent medium structure 70 is provided between the first refractive index unit 31 and the black matrix 60, which can prevent the second refractive index unit 32 from being too thick in a local position and affecting the wide-angle light extraction of the light-emitting device 21, thereby avoiding the problem of large viewing angle color deviation.

[0053] In an embodiment of the present invention, the light-emitting device 21 includes a red light-emitting device, a green light-emitting device, and a blue light-emitting device. In some embodiments, the transparent medium structure 70 is not filled between the first refractive index unit 31 and the black matrix 60 at the position overlapping with the blue light-emitting device; and the transparent medium structure 70 is filled between the first refractive index unit 31 and the black matrix 60 at the position overlapping with the green light-emitting device. Such a setting can balance the differences in luminous efficiency and service life of light-emitting devices of different colors, and improve the service life of the blue light-emitting device by improving the light extraction efficiency of the blue light-emitting device. In addition, among the three colors of red, green and blue, the human eye is more sensitive to green light. Avoiding the large visual color deviation of the green light-emitting device can avoid display color deviation and improve the overall display effect of the display panel.

[0054] In other embodiments, Figure 7 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 7 As shown, the first refractive index unit 31 is multiplexed into a color resist unit 51. The refractive index of the first refractive index unit 31 is greater than that of the second refractive index unit 32. In other words, the color resist unit 51 is multiplexed into a high refractive index layer within the light extraction layer 30. In this embodiment, the first refractive index unit 31 cooperates with the second refractive index unit 32 to improve the light extraction efficiency of the light-emitting device 21. Furthermore, the first refractive index unit 31 also has light filtering properties, which can be used to reduce the display panel's reflection of ambient light. This embodiment integrates a structure that improves the light extraction efficiency of the light-emitting device 21 with a structure that reduces the display panel's reflectivity, reducing the thickness of the display panel module and improving its overall flexibility. Furthermore, the refractive index of the second refractive index unit 32 is lower than that of the first refractive index unit 31. Positioned at the outermost edge of the integrated module structure, it reduces the refractive index difference between the module structure and the film layer above it, thereby reducing the surface reflectivity of the module structure's outer surface, further reducing the display panel's reflectivity of ambient light and improving the display quality.

[0055] like Figure 7 As shown, the display panel also includes a black matrix 60, which has a first opening K1. At least the central portion 31a and the functional portion 31b of the first refractive index unit 31 are located within the first opening K1. The first refractive index unit 31 is reused as the color resistance unit 51, and the first refractive index unit 31 overlapping with the light-emitting device 21 is a patterned structure, while the second refractive index unit 32 covers the first refractive index unit 31 and the black matrix 60. The black matrix 60 overlaps with the pixel defining layer 22. The black matrix 60 can block the light emitted by the light-emitting device toward the black matrix 60 to reduce the light emitted in the large-angle direction and improve the large-angle color deviation problem. At the same time, the black matrix 60 can block the metal structure located below it to prevent the metal structure from reflecting ambient light, which can further reduce the reflectivity of the display panel to ambient light.

[0056] 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 first refractive index unit 31 is multiplexed into the color resist unit 51, and the first refractive index unit 31 also includes an edge portion 31c, which surrounds the functional portion 31b and is connected to the functional portion 31b; in the direction e perpendicular to the plane of the substrate 10, at least part of the edge portion 31c overlaps with the black matrix 60. Figure 7 The diagram shows that part of the edge portion 31c is located in the first opening K1 of the black matrix 60. In this embodiment, the first refractive index unit 31 forms a three-segment structure (including a central portion 31a, a functional portion 31b and an edge portion 31c), that is, the color resist unit 51 forms a three-segment structure. Among them, at least part of the edge portion 31c overlaps with the black matrix 60, indicating that the first refractive index unit 31 is located in the first opening K1 of the black matrix 60 and extends outside the first opening K1. The first refractive index unit 31 is multiplexed into the color resist unit 51, so that the color resist unit 51 is deposited at each position in the first opening K1, and the reflected light in the display panel directed to the first opening K1 can be filtered by the color resist unit 51 to reduce the reflectivity of the display panel to the ambient light.

[0057] In one embodiment, if Figure 8 As shown, the thickness of the functional portion 31b gradually decreases from the center portion 31a toward the functional portion 31b. The edge portion 31c is connected to the functional portion 31b, and a groove C is formed between the edge portion 31c and the functional portion 31b, wherein the opening of the groove C faces the side away from the light emitting device 21. The first surface ( Figure 8(not marked in the figure) is a groove wall of the groove C; the first angle between the first surface and the edge portion 31c formed by the plane parallel to the substrate 10 is α, 0°<α≤90°. The first refractive index unit 31 is reused as the color resist unit 51, and the color resist unit 51 is usually manufactured by a graphical process. The display panel provided by the embodiment of the present invention can use grayscale photolithography technology to produce a color resist unit 51 with a groove C during production to form a three-segment structure of the color resist unit 51, that is, to produce a three-segment structure of the first refractive index unit 31. The first refractive index unit 31 has a filtering function, which can reduce the reflectivity of the display panel to the ambient light and improve the display effect. At the same time, the functional part 31b in the first refractive index unit 31 cooperates with the second refractive index unit 32 to redirect the large-angle light emitted by the light-emitting device 21, thereby improving the light extraction efficiency of the light-emitting device 21. This embodiment reuses the first refractive index unit 31, integrating a structure that improves the light extraction efficiency of the light-emitting device 21 with a structure that reduces the reflectivity of the display panel. This reduces the thickness of the display panel module and improves its overall flexibility. Furthermore, the second refractive index unit 32, with a lower refractive index, is located at the outermost side of the integrated module structure, minimizing the refractive index difference between the module structure and the film layer above it. This reduces the surface reflectivity of the module structure's outer surface, further reducing the display panel's reflectivity to ambient light and enhancing the display quality.

[0058] In some embodiments, the depth of the groove C in a direction e perpendicular to the plane of the substrate 10 is no less than half the thickness of the color resist unit 51. This configuration ensures that the interface between the functional portion 31b and the second refractive index unit 32 has a sufficiently large area, ensuring that the functional portion 31b and the second refractive index unit 32 cooperate to redirect more wide-angle light, thereby improving the light extraction efficiency of the light-emitting device 21. It should be noted that the thickness of the color resist unit 51 can be understood as the maximum thickness of the color resist unit in a direction e perpendicular to the plane of the substrate 10.

[0059] In the display panel provided by the embodiment of the present invention, the light emitting device 21 includes at least a red light emitting device, a green light emitting device and a blue light emitting device. Figure 8 In the embodiment, the first surface of the edge portion 31c near the functional portion 31b reflects some of the wide-angle light emitted by the light emitting device 21, thereby affecting the viewing angle brightness of the light emitting device. To reduce the impact of viewing angle brightness on display effects, the inventors proposed another display panel.

[0060] In one embodiment, Figure 9 A schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 9As shown, the light-emitting device includes a first light-emitting device 21-1 and a second light-emitting device 21-2 of different colors; the first angle in the first refractive index unit 31 overlapping with the first light-emitting device 21-1 is α1, and the first angle in the first refractive index unit 31 overlapping with the second light-emitting device 21-2 is α2, wherein α1<α2. In this embodiment, the first refractive index unit 31 is reused as a color resist unit, and the color of the color resist unit matches the luminous color of the light-emitting device below it. The first light-emitting device 21-1 overlaps with the first color resist unit 51-1, and the second light-emitting device 21-2 overlaps with the second color resist unit 51-2. The colors of the first color resist unit 51-1 and the second color resist unit 51-2 are different. As shown Figure 9 As shown in FIG, the first surface of the edge portion 31c close to the functional portion 31b contacts the second refractive index unit 32. There is a refractive index difference between the edge portion 31c and the second refractive index unit 32. The large-angle light emitted by the light-emitting device will be reflected when it hits the edge portion 31c. Figure 9 Considering the two light paths illustrated in the figure, it is assumed that the first light-emitting device 21-1 and the second light-emitting device 21-2 respectively emit wide-angle light beams, and the propagation directions of the two wide-angle light beams are the same. The light beam emitted by the first light-emitting device 21-1 is significantly deviated from the original wide-angle direction after being reflected by the surface of the edge portion 31c in the first color resist unit 51-1. However, the light beam emitted by the first light-emitting device 21-1 is reflected by the surface of the edge portion 31c in the first color resist unit 51-1 and then reflected again inside the groove C, and can still be emitted in the wide-angle direction. In other words, the larger the first angle, the smaller the impact on wide-angle light emission. From this, it can be seen that setting α1<α2 can make the wide-angle light emission of the second light-emitting device 21-2 less affected by the edge portion 31c, that is, the wide-angle brightness of the second light-emitting device 21-2 can be relatively improved. The embodiment of the present invention can make differentiated settings for the first angle in the first refractive index unit 31 corresponding to light-emitting devices of different colors. In some embodiments, the second light-emitting device 21-2 emits green light, the first light-emitting device 21-1 emits red light, or the first light-emitting device 21-1 emits blue light, that is, the second light-emitting device 21-2 is a green light-emitting device. The human eye is more sensitive to green light, ensuring the wide-viewing angle brightness of the green light-emitting device can improve the display effect of the display panel under a wide viewing angle.

[0061] In some embodiments of the present invention, a display panel includes display areas with different light transmittances. Compared to display areas with lower light transmittances, the light-emitting devices in the display area with higher light transmittances have a lower density or a smaller area size. This results in a lower overall brightness in the display area with higher light transmittances, causing a split-screen display in the display area. In the prior art, the brightness of the light-emitting devices in the display area with higher light transmittances is increased to balance the display brightness of the two areas. However, this seriously affects the service life of the light-emitting devices in the display area with higher light transmittances. In order to reduce the difference in display brightness between areas with different light transmittances, the inventors have proposed another display panel.

[0062] In some embodiments, Figure 10 A schematic diagram of another display panel provided by an embodiment of the present invention, Figure 11 for Figure 10 A schematic diagram of a cross section at the midline BB'. Figure 10 As shown, the display panel includes a display area AA and a non-display area NA. The display area AA includes a first display area AA1 and a second display area AA2. The transmittance of the second display area AA2 is greater than that of the first display area AA1. The light-emitting devices include a first light-emitting device 21-1 and a second light-emitting device 21-2. The first light-emitting device 21-1 is located in the first display area AA1, and the second light-emitting device 21-2 is located in the second display area AA2. Optionally, the density of the second light-emitting devices 21-2 in the second display area AA2 is set to be lower than the density of the first light-emitting devices 21-1 in the first display area AA1, so that the transmittance of the second display area AA2 is greater than that of the first display area AA1. Optionally, the area size of the second light-emitting devices 21-2 in the second display area AA2 is set to be smaller than the area size of the first light-emitting devices 21-1 in the first display area AA1, so that the transmittance of the second display area AA2 is greater than that of the first display area AA1. The second display area AA2 is reserved for optical devices. Optical devices are placed below the second display area AA2. Ambient light can penetrate the second display area AA2 and be utilized by the optical devices, thereby achieving the optical performance of the optical devices. The optical devices can be cameras, infrared sensors, etc.

[0063] like Figure 11As shown, the first refractive index unit 31 is multiplexed as a color resistance unit 51. The first refractive index unit 31 includes a central portion 31a, a functional portion 31b, and an edge portion 31c. A groove C is formed between the edge portion 31c and the functional portion 31b. The first surface of the edge portion 31c on the side close to the functional portion 31b forms a first included angle pointing to the edge portion 31c with the plane where the substrate 10 is located. Among them, the first included angle in the first refractive index unit 31 overlapping with the first light-emitting device 21-1 is α1, and the first included angle in the first refractive index unit 31 overlapping with the second light-emitting device 21-2 is α2, and α1 < α2. Through the above Figure 8 As can be known from the description in the above embodiments, the larger the angle of the first included angle, the smaller the influence on the large-angle light emission. That is, the larger the angle of the first included angle, the more light is emitted at a large angle, and thus the total light emission amount of the light-emitting device can be increased, and the light-emitting efficiency of the light-emitting device can be improved. By setting α1 < α2, the large-angle light emission of the second light-emitting device 21-2 is less affected by the edge portion 31c, the light emission amount of the second light-emitting device 21-2 is increased, and the light-emitting efficiency of the second light-emitting device 21-2 is greater than that of the first light-emitting device 21-1. By improving the light-emitting efficiency of the second light-emitting device 21-2, the light-emitting brightness of the second light-emitting device 21-2 can be improved, so as to balance the brightness difference between the second display area AA2 and the first display area AA1, improve the phenomenon of display split screen, and improve the display effect.

[0064] In another embodiment, Figure 12 is a schematic diagram of another display panel provided by an embodiment of the present invention. As Figure 12 shown, the vertical distance from the surface of the edge portion 31c away from the substrate 10 to the substrate 10 is a first distance D1, and the vertical distance from the surface of the central portion 31a away from the substrate 10 to the substrate 10 is a second distance D2, and the first distance D1 is less than the second distance D2. The edge portion 31c is connected to the functional portion 31b, and in the direction e perpendicular to the plane where the substrate 10 is located, at least part of the edge portion 31c overlaps with the black matrix 60. In this embodiment, the first refractive index unit 31 forms a three-stage structure, that is, the color resistance unit 51 forms a three-stage structure. Among them, at least part of the edge portion 31c overlaps with the black matrix 60, indicating that the first refractive index unit 31 is located within the first opening K1 of the black matrix 60 and extends outside the first opening K1. The first refractive index unit 31 is multiplexed as the color resistance unit 51, so that the color resistance unit 51 is deposited at each position within the first opening K1, and the reflected light incident on the first opening K1 in the display panel can be filtered by the color resistance unit 51 to reduce the reflectivity of the display panel to ambient light. And by setting D1 < D2, the large-angle refracted light passing through the interface where the functional portion 31b contacts the second refractive index unit 32 can directly penetrate the second refractive index unit 32, which can ensure the light emission at a large angle and thus ensure the display brightness at a large angle.

[0065] The above embodiments illustrate a case where the refractive index of the first refractive index unit 31 is greater than the refractive index of the second refractive index unit 32, and the thickness of the functional portion 31b gradually decreases in the direction from the central portion 31a to the functional portion 31b. The following embodiments illustrate a case where the refractive index of the first refractive index unit 31 is less than the refractive index of the second refractive index unit 32, and the thickness of the functional portion 31b gradually increases in the direction from the central portion 31a to the functional portion 31b.

[0066] In some embodiments, Figure 13 Schematic diagrams of other display panels provided by embodiments of the present invention, such as Figure 13 As shown, the refractive index of the first refractive index unit 31 is less than the refractive index of the second refractive index unit 32, and the display panel includes a color resist unit 51, and the first refractive index unit 31 is multiplexed as the color resist unit 51. It can also be said that the color resist unit 51 is multiplexed as the first refractive index unit 31, that is, the color resist unit 51 is multiplexed as a low refractive index layer in the light extraction layer 30. In this embodiment, the first refractive index unit 31 has the function of cooperating with the second refractive index unit 32 to improve the light extraction efficiency of the light emitting device 21. At the same time, the first refractive index unit 31 also has a filtering characteristic and can be used to reduce the reflection of ambient light by the display panel. This embodiment integrates the structure for improving the light extraction efficiency of the light emitting device 21 and the structure for reducing the reflectivity of the display panel, which can reduce the module thickness of the display panel and is conducive to improving the overall flexibility of the display panel.

[0067] like Figure 13 As shown, the first refractive index unit 31 further includes an edge portion 31c, which surrounds and connects to the functional portion 31b. The functional portion 31b and the central portion 31a are located within the first opening K1 of the black matrix 60. Furthermore, in a direction e perpendicular to the plane of the substrate 10, at least a portion of the edge portion 31c overlaps with the black matrix 60. That is, the black matrix 60 is located on the side of the color resist unit 51 that is closest to the substrate 10. During fabrication, the black matrix 60 is fabricated first, followed by the color resist unit 51. In this embodiment, the first refractive index unit 31 forms a three-segment structure, with the first refractive index unit 31 being multiplexed as the color resist unit 51. This allows the color resist unit 51 to be deposited at every location within the first opening K1. Light reflected from the display panel toward the first opening K1 is filtered by the color resist unit 51, thereby reducing the display panel's reflectivity to ambient light.

[0068] In some embodiments, as described above Figure 5 or Figure 13As shown, the central portion 31a and the functional portion 31b of the first refractive index unit 31 are located within the first opening K1 of the black matrix 60. In some embodiments of the present invention, the color resist unit 51 is reused as the first refractive index unit 31 in the light extraction layer 30, or the color resist unit 51 is reused as the second refractive index unit 32, thereby integrating the structure that improves the light extraction efficiency of the light-emitting device 21 and the structure that reduces the reflectivity of the display panel. This can reduce the module thickness of the display panel and help improve the overall flexibility of the display panel. At the same time, the central portion 31a and the functional portion 31b of the first refractive index unit 31 are located within the first opening K1 of the black matrix 60. The black matrix 60 can not only space adjacent color resist units 51, but also shield the metal structure located below it, thereby reducing the metal structure's reflection of ambient light. In addition, the embodiment of the present invention enables the surfaces of the central portion 31a and the functional portion 31b close to the substrate 10, and the surface of the black matrix 60 close to the substrate 10 to contact the same base layer, and the black matrix 60 can be integrated into a structure for improving the light extraction efficiency of the light-emitting device 21 and a module structure for reducing the reflectivity of the display panel, which can further reduce the module thickness of the display panel and enhance the overall flexibility of the display panel.

[0069] In the embodiment of the present invention, the functional portion 31b has a cutting angle θ, 40°≤θ≤80°, and the thickness of the functional portion 31b gradually changes from the central portion 31a to the direction of the functional portion 31b. The shape of the functional portion 31b can be as follows: Figure 2 or Figure 3 As shown, the second surface M2 of the functional portion 31b away from the substrate 10 is a plane. Figure 2 or Figure 3 In the embodiment, the angle formed by the planar second surface M2 and the plane parallel to the substrate 10 and pointing toward the functional portion 31b is a cut angle θ. In other embodiments, the second surface M2 of the functional portion 31b away from the substrate 10 is a curved surface. Figure 14 A partial schematic diagram of another display panel provided by an embodiment of the present invention, Figure 14 In the figure, the thickness of the functional part 31b gradually decreases in the direction from the central part 31a to the functional part 31b. Figure 4 As shown, when the second surface M2 of the functional portion 31b away from the substrate 10 is a curved surface, the angle formed by the tangent plane of the second surface M2 and the plane parallel to the substrate 10 and pointing to the functional portion 31b is the tangent angle θ. Figure 14 The tangent angle θ is not shown in the figure. The tangent plane can be understood by referring to the concept of tangent plane in mathematical science, which will not be described here.

[0070] In other embodiments, the thickness of the functional portion 31b gradually increases from the central portion 31a to the functional portion 31b, and the second surface M2 of the functional portion 31b away from the substrate 10 is a curved surface, which is not illustrated in the figure.

[0071] The embodiment of the present invention utilizes the interface between the second surface M2 and the second refractive index unit 32 to deflect high-angle light rays incident from the functional portion 31b into the second refractive index unit 32, and limits the range of the cut angle θ of the functional portion 31b. It can be understood that the high-angle light rays have a large acute angle with the normal viewing direction, and the interface between the functional portion 31b and the second refractive index unit 32 can deflect the propagation direction of the high-angle light rays. Some high-angle light rays are deflected toward the normal viewing direction by the interface between the functional portion 31b and the second refractive index unit 32, while some high-angle light rays are deflected away from the normal viewing direction by the interface between the functional portion 31b and the second refractive index unit 32. In other words, when the cut angle θ is fixed, the high-angle light rays that contribute to improving the luminous efficiency of the light-emitting device 21 account for a certain proportion of all high-angle light rays emitted by the light-emitting device 21. As the cut angle θ increases, the proportion of high-angle light rays that contribute to improving the luminous efficiency of the light-emitting device 21 increases and then decreases. In the embodiment of the present invention, 40°≤θ≤80° is set, so that the large-angle light that plays a role in improving the luminous efficiency of the light-emitting device 21 accounts for a relatively large proportion of all large-angle light emitted by the light-emitting device 21, that is, most of the large-angle light is deflected toward the front view direction after refraction at the interface where the second surface M2 and the second refractive index unit 32 contact each other, thereby contributing to improving the light extraction efficiency of the light-emitting device 21.

[0072] In some embodiments, 45°≤θ≤65°.

[0073] In the display panel provided by the embodiment of the present invention, the light emitting device 21 includes at least a red light emitting device, a green light emitting device, and a blue light emitting device. The service life of light emitting devices of different colors varies to a certain extent. The embodiment of the present invention further considers designing different sizes of the cut angle θ in the first refractive index unit 31 corresponding to the light emitting devices of different colors 21 to compensate for the difference in service life between the light emitting devices of different colors 21. In some embodiments, Figure 15 A partial schematic diagram of another display panel provided by an embodiment of the present invention, such as Figure 15As shown, the light-emitting device includes a first light-emitting device 21-1 and a second light-emitting device 21-2 of different colors. The first refractive index unit 31 overlapping with the first light-emitting device 21-1 has a cut angle of θ1, and the first refractive index unit 31 overlapping with the second light-emitting device 21-2 has a cut angle of θ2, where θ1<θ2. When the cut angles fall within a certain range, the larger the cut angle, the more large-angle light can be diverted toward the normal viewing direction by the interface between the functional portion 31b and the second refractive index unit 32. When θ1<θ2, the light extraction efficiency of the second light-emitting device 21-2 is improved more than that of the first light-emitting device 21-1, which means that the light extraction efficiency of the second light-emitting device 21-2 can be further improved, thereby increasing the service life of the second light-emitting device 21-2.

[0074] In some embodiments, the second light emitting device 21 - 2 emits blue light, and the first light emitting device 21 - 1 emits red light or green light.

[0075] Figure 15 In this embodiment, the thickness of the functional portion 31b gradually decreases in the direction from the central portion 31a toward the functional portion 31b. In other embodiments, the thickness of the functional portion 31b gradually increases in the direction from the central portion 31a toward the functional portion 31b. Furthermore, the size of the cut angle θ in the first refractive index unit 31 overlapping with light-emitting devices of different colors in the display panel is designed differently, which is not illustrated here.

[0076] In other embodiments, the embodiments of the present invention make different settings for the sizes of the cut angles θ of the first refractive index unit 31 in different transmittance regions. Figure 16 for Figure 10 Another cross-sectional diagram at the midline BB'. Figure 16 As shown, the first light-emitting device 21-1 is located in the first display area AA1, and the second light-emitting device 21-2 is located in the second display area AA2. The first refractive index unit 31 overlapping with the first light-emitting device 21-1 has a cut angle of θ1, and the first refractive index unit 31 overlapping with the second light-emitting device 21-2 has a cut angle of θ2, where θ1 < θ2. This arrangement enables the light extraction efficiency of the second light-emitting device 21-2 to be greater than that of the first light-emitting device 21-1. This improves the light extraction efficiency of the second light-emitting device 21-2 and thus increases the brightness of the second light-emitting device 21-2. This balances the brightness difference between the second display area AA2 and the first display area AA1, improves the split-screen display phenomenon, and enhances the display effect.

[0077] Figure 16In the embodiment, it is schematically shown that the thickness of the functional part 31b gradually decreases in the direction from the central part 31a to the functional part 31b. In other embodiments, the thickness of the functional part 31b gradually increases in the direction from the central part 31a to the functional part 31b; and a differential design is made for the size of the cut angle θ in the first refractive index unit 31 where the light-emitting devices in different light transmittance regions of the display panel overlap, and no further schematic drawing is shown here.

[0078] In some embodiments, a differential setting is made for the maximum thickness of the functional part 31b in the first refractive index unit 31 where different light-emitting devices 21 overlap, so as to adjust the light-emitting efficiency of the light-emitting devices 21 by adjusting the thickness of the functional part 31b.

[0079] In one embodiment, a differential design is made for the maximum thickness of the functional part 31b in the first refractive index unit 31 corresponding to different color light-emitting devices 21, so as to compensate for the lifetime difference between different color light-emitting devices 21. Figure 17 Another partial schematic diagram of the display panel provided by the embodiment of the present invention is as Figure 17 shown. The light-emitting colors of the first light-emitting device 21-1 and the second light-emitting device 21-2 are different. The maximum thickness of the functional part 31b in the first refractive index unit 31 overlapping with the first light-emitting device 21-1 is d1, and the maximum thickness of the functional part 31b in the first refractive index unit 31 overlapping with the second light-emitting device 21-2 is d2, where d1 < d2. Figure 17 It is schematically shown in the figure that the thickness of the functional part 31b gradually decreases in the direction from the central part 31a to the functional part 31b. Then, the position where the functional part 31b contacts the central part 31a is the maximum thickness of the functional part 31b. Increasing the maximum thickness of the functional part 31b can increase the surface area of the functional part 31b on the side away from the substrate 10, that is, it can increase the contact area between the functional part 31b and the second refractive index unit 32, so as to deflect more large-angle light rays emitted by the light-emitting device 21, thereby improving the light-emitting efficiency of the light-emitting device 21. Setting d1 < d2 can achieve that the improvement amplitude of the light-emitting efficiency of the second light-emitting device 21-2 is greater than that of the first light-emitting device 21-1, that is, it can more improve the light-emitting efficiency of the second light-emitting device 21-2, thereby improving the service life of the second light-emitting device 上21-2.

[0080] Figure 17 In the embodiment, it is schematically shown that the thickness of the functional part 31b gradually decreases in the direction from the central part 31a to the functional part 31b. In other embodiments, the thickness of the functional part 31b gradually increases in the direction from the central part 31a to the functional part 31b; and a differential design is made for the maximum thickness of the functional part 31b in the first refractive index unit 31 overlapping with different color light-emitting devices, and no further schematic drawing is shown here.

[0081] In some embodiments, the first refractive index unit 31 is multiplexed as a color resistance unit, and the light transmittance of color resistance units of different colors is different. The light transmittance of the color resistance unit and the maximum thickness of the functional part 31b can be designed in cooperation. The higher the light transmittance of the color resistance unit is set, the greater the maximum thickness of the functional part 31b is, so that the improvement amplitude of the light extraction efficiency of the light-emitting device 21 can be increased.

[0082] In other embodiments, the present invention embodiment makes a differential setting for the maximum thickness of the functional part 31b in the first refractive index unit 31 in different light transmittance regions. Figure 18 For Figure 10 Another cross-sectional schematic diagram at the position of the middle tangent B-B'. As Figure 18 shown, the first light-emitting device 21-1 is located in the first display area AA1, the second light-emitting device 21-2 is located in the second display area AA2, the maximum thickness of the functional part 31b in the first refractive index unit 31 overlapping with the first light-emitting device 21-1 is d1, and the maximum thickness of the functional part 31b in the first refractive index unit 31 overlapping with the second light-emitting device 21-2 is d2, where d1 < d2. Such a setting can make the light extraction efficiency of the second light-emitting device 21-2 greater than that of the first light-emitting device 21-1, so that the light-emitting brightness of the second light-emitting device 21-2 can be improved by improving the light extraction efficiency of the second light-emitting device 21-2, thereby balancing the brightness difference between the second display area AA2 and the first display area AA1, improving the phenomenon of display split screen, and improving the display effect.

[0083] Figure 18 In the embodiment, it is schematically shown that the thickness of the functional part 31b gradually decreases in the direction from the central part 31a to the functional part 31b. In other embodiments, in the direction from the central part 31a to the functional part 31b, the thickness of the functional part 31b gradually increases; and a differential design is made for the maximum thickness of the functional part 31b in the first refractive index unit 31 overlapping with the light-emitting devices in different light transmittance regions of the display panel, which is not schematically shown in the drawings here.

[0084] In some embodiments, the display panel further includes a touch layer. Figure 19 Another schematic diagram of the display panel provided by the embodiment of the present invention. As Figure 19 shown, the display panel further includes a touch layer 70. The touch layer 70 is located between the encapsulation layer 40 and the light extraction layer 30. The touch layer 70 includes touch electrodes, and the touch layer 70 can implement the touch function of the display panel. Figure 19 The film layer position of the touch layer in the display panel is schematically shown, and only a specific structure of one light extraction layer 30 is schematically shown.

[0085] The embodiment of the present invention further provides a display device, Figure 20A schematic diagram of a display device provided by an embodiment of the present invention, such as Figure 20 As shown, the display device includes a display panel 100 provided by any embodiment of the present invention. The structure of the display panel has been described in the above-mentioned display panel embodiments and will not be repeated here. The display device provided by the embodiment of the present invention includes electronic devices with display functions, such as mobile phones, computers, tablets, televisions, car displays, and smart wearable devices.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that: The display panel includes: substrate; a light-emitting device layer, located on one side of the substrate; the light-emitting device layer includes a plurality of light-emitting devices; A light extraction layer is located on a side of the light emitting device layer away from the substrate; the light extraction layer includes a first refractive index unit and a second refractive index unit with different refractive indices; wherein, The first refractive index unit overlaps with the light-emitting device in a direction perpendicular to the plane of the substrate; the first refractive index unit includes a central portion and a functional portion surrounding the central portion, and the thickness of the functional portion gradually changes in a direction from the central portion to the functional portion; The second refractive index unit is located on a side of the first refractive index unit away from the substrate, and the second refractive index unit at least covers the functional portion; The first refractive index unit further includes an edge portion, the edge portion surrounds the functional portion, and the edge portion is connected to the functional portion; A first angle α formed by a first surface of the edge portion close to the functional portion and a plane parallel to the substrate and pointing toward the edge portion is formed; The light emitting device includes a first light emitting device and a second light emitting device; The first angle in the first refractive index unit overlapping with the first light emitting device is α1, and the first angle in the first refractive index unit overlapping with the second light emitting device is α2, where α1<α2.

2. The display panel according to claim 1, wherein: The refractive index of the first refractive index unit is greater than the refractive index of the second refractive index unit; The thickness of the functional portion gradually decreases in a direction from the central portion toward the functional portion.

3. The display panel according to claim 2, wherein: The display panel includes a color resist layer, the color resist layer includes a color resist unit, and the color resist layer is located on a side of the light extraction layer away from the light emitting device layer.

4. The display panel according to claim 3, wherein: The refractive index of the color resist unit is smaller than the refractive index of the first refractive index unit.

5. The display panel according to claim 2, wherein: The display panel includes a color resist layer, and the color resist layer includes a color resist unit; The second refractive index unit is multiplexed as the color resist unit.

6. The display panel according to claim 5, wherein: The display panel also includes a black matrix, which is located on a side of the light-emitting device layer away from the substrate; the black matrix has a first opening, the first refractive index unit is located in the first opening, and a transparent medium structure is provided between the first refractive index unit and the black matrix.

7. The display panel according to claim 2, wherein: The display panel includes a color resist layer, and the color resist layer includes a color resist unit; The first refractive index unit is multiplexed as the color resist unit.

8. The display panel according to claim 7, wherein: The display panel further includes a black matrix located on a side of the light-emitting device layer away from the substrate; the black matrix has a first opening, and at least the central portion and the functional portion of the first refractive index unit are located within the first opening.

9. The display panel according to claim 8, wherein: In a direction perpendicular to the plane of the substrate, at least a portion of the edge portion overlaps with the black matrix.

10. The display panel according to claim 9, wherein: A groove is formed between the edge portion and the functional portion, and the first surface is a groove wall of the groove; The first angle satisfies: 0°<α≤90°.

11. The display panel according to claim 9, wherein The vertical distance between the surface of the edge portion away from the substrate and the substrate is a first distance, and the vertical distance between the surface of the center portion away from the substrate and the substrate is a second distance, and the first distance is smaller than the second distance.

12. The display panel according to claim 1, wherein The refractive index of the first refractive index unit is smaller than the refractive index of the second refractive index unit; The thickness of the functional portion gradually increases in a direction from the central portion to the functional portion.

13. The display panel according to claim 12, wherein: The display panel includes a color resist layer, and the color resist layer includes a color resist unit; The first refractive index unit is multiplexed as the color resist unit.

14. The display panel according to claim 13, wherein: The first refractive index unit further includes an edge portion, the edge portion surrounds the functional portion, and the edge portion is connected to the functional portion; The display panel further includes a black matrix, the black matrix is ​​located on a side of the light emitting device layer away from the substrate, and the black matrix has a first opening; In a direction perpendicular to the plane of the substrate, at least a portion of the edge portion overlaps with the black matrix.

15. The display panel according to claim 1, wherein The display panel further includes a black matrix, which is located on a side of the light-emitting device layer away from the substrate; the black matrix has a first opening, and the central portion and the functional portion of the first refractive index unit are located in the first opening.

16. The display panel according to claim 1, wherein The functional portion has a cutting angle θ, 40°≤θ≤80°, wherein, When the second surface of the functional portion away from the substrate is a plane, the angle formed by the second surface and the plane parallel to the substrate pointing to the functional portion is the cutting angle θ; alternatively, when the second surface of the functional portion away from the substrate is a curved surface, the angle formed by the tangent plane of the second surface and the plane parallel to the substrate pointing to the functional portion is the cutting angle θ.

17. The display panel according to claim 16, wherein: The light emitting device includes a first light emitting device and a second light emitting device; The cut angle in the first refractive index unit overlapping with the first light emitting device is θ1, and the cut angle in the first refractive index unit overlapping with the second light emitting device is θ2, wherein θ1<θ2.

18. The display panel according to claim 1, wherein The light emitting device includes a first light emitting device and a second light emitting device; The maximum thickness of the functional portion in the first refractive index unit overlapping with the first light emitting device is d1, and the maximum thickness of the functional portion in the first refractive index unit overlapping with the second light emitting device is d2, wherein d1 <d2。 19. The display panel according to any one of claims 1, 17 and 18, wherein: The first light emitting device and the second light emitting device emit different colors of light.

20. The display panel according to any one of claims 1, 17, and 18, wherein: The display area of ​​the display panel includes a first display area and a second display area, and the light transmittance of the second display area is greater than the light transmittance of the first display area; The first light emitting device is located in the first display area, and the second light emitting device is located in the second display area.

21. The display panel according to claim 1, wherein The light emitting device layer includes a pixel defining layer, the pixel defining layer has a second opening, the light emitting device is located in the second opening; the second opening has a sidewall; In a direction perpendicular to the plane of the substrate, at least a portion of the functional portion overlaps with the sidewall.

22. A display device, characterized in that: A display panel comprising any one of claims 1 to 21.

Images