Display panel and display apparatus

Abstract

Disclosed in the present application are a display panel and a display apparatus. The display panel comprises: a light-emitting device layer and a light extraction layer, wherein the light-emitting device layer comprises a light-emitting layer and a pixel defining layer, which are arranged spaced apart from each other; the light extraction layer is located on a light emergent side of the light-emitting layer, and the light extraction layer comprises a plurality of micro-lenses and a planarization layer; each micro-lens has a first refractive index n1, the planarization layer completely covers light emergent sides of the plurality of micro-lenses, and surfaces of the micro-lenses facing the light-emitting device layer are exposed relative to the planarization layer; the planarization layer has a second refractive index n2, and n1<n2; and in the thickness direction of the light-emitting device layer, projections of the micro-lenses on the plane where the light-emitting device layer is located and a projection of the pixel defining layer on the plane where the light-emitting device layer is located at least partially overlap with each other. In the present application, the front light emission intensity can be increased by means of a light extraction layer, and by means of the cooperation of arrayed micro-lenses and a planarization layer, the light emission efficiency of sub-pixels of different colors is adjusted, such that the consistency of the brightnesses of the colors in a low brightness can be improved, thereby ameliorating the color cast, and remarkably improving the display effect.

Description

Display panel and display device Technical Field

[0001] The present application relates to, but is not limited to, the field of display technology, and specifically to a display panel and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) display panels can emit light using either a single-layer light-emitting device or a tandem (stacked) device. Tandem devices drive multiple light-emitting layers in series, significantly increasing brightness compared to single-layer devices. However, at low brightness levels, because the current density of tandem devices is less than half that of single-layer devices, color shift is more severe. Therefore, stacked OLED display panels using tandem devices are more prone to noticeable color shift and unevenness.

[0003] To improve color shift and color unevenness, gamma compensation is typically applied to laminated OLED display panels. However, at low brightness, the actual luminous efficiency of different color sub-pixels varies. For example, green sub-pixels typically have higher luminous efficiency, while blue sub-pixels typically have lower luminous efficiency. Gamma compensation often fails to ensure consistent brightness gain across all color sub-pixels, leading to significant color shift in laminated OLED display panels at low brightness. SUMMARY OF THE INVENTION

[0004] Embodiments of the present application provide a display panel and a display device to improve the technical problem of severe color shift of a stacked OLED display panel at low brightness.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] A display panel according to an embodiment of the present application includes a light-emitting device layer and a light extraction layer, wherein:

[0007] The light-emitting device layer includes a light-emitting layer and a pixel definition layer;

[0008] The light extraction layer is located on the light-emitting side of the light-emitting layer, and includes a plurality of microlenses and a flat layer. Each of the microlenses has a first refractive index n1. The flat layer completely covers the light-emitting sides of the plurality of microlenses, and surfaces of the microlenses facing the light-emitting device layer are exposed relative to the flat layer. The flat layer has a second refractive index n2, and n1<n2 is satisfied.

[0009] The thickness direction of the light-emitting device layer is defined as a first direction, and along the first direction, projections of the microlenses and the pixel definition layer on the plane where the light-emitting device layer is located at least partially overlap.

[0010] Accordingly, a display device according to an embodiment of the present application includes the display panel as described above in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0012] FIG1 is a schematic cross-sectional view of a display panel according to an embodiment of the present application;

[0013] FIG2 is a schematic diagram of a partially enlarged structure of area A in FIG1 ;

[0014] FIG3 is another schematic cross-sectional view of the display panel according to an embodiment of the present application;

[0015] FIG4 is a schematic diagram of a partially enlarged structure of area B in FIG3 ;

[0016] FIG5 is a schematic top view of the structure of a display panel according to an embodiment of the present application;

[0017] FIG6 is another schematic top view of the structure of the display panel according to the embodiment of the present application;

[0018] FIG7 is another schematic top view of the display panel according to an embodiment of the present application;

[0019] FIG8 is a schematic flow chart of a method for manufacturing a display panel according to an embodiment of the present application;

[0020] Reference numerals:

[0021] 10-light-emitting device layer; 11-light-emitting layer; 111-first light-emitting unit; 112-second light-emitting unit; 113-third light-emitting unit; 114-cross section; 12-pixel definition layer; 121-pixel opening; 122-fourth surface; 13-first electrode layer; 131-third region; 14-second electrode layer; 20-light extraction layer; 21-microlens; 211-first surface; 212-second surface; 213-third surface; 214-first microlens; 215-second microlens; 22-flat layer; 23-first inorganic layer; 24-second inorganic layer; 30-encapsulation layer; 31-first region; 32-second region; 40-driving circuit layer; 50-substrate; 60-support column. Implementation Method

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0023] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0024] An embodiment of the present application provides a display panel.

[0025] In some embodiments, an orthographic projection of the planar layer on the plane where the cross section of the display panel is located covers at least a portion of an orthographic projection of the microlens on the plane where the cross section is located.

[0026] In some embodiments, the microlens has a first surface and a second surface disposed opposite to each other along a first direction, the second surface is disposed toward the pixel definition layer, and the first surface is disposed away from the pixel definition layer;

[0027] The lateral direction of the light emitting device layer is defined as a second direction. Along the second direction, the first surface has a first size L1, and the second surface has a second size L2, satisfying L1<L2.

[0028] In some embodiments, the microlens further has a third surface connected between the first surface and the second surface;

[0029] There is an included angle α between the third surface and the second surface, and the light-emitting layer has a maximum light output angle β, which satisfies the following conditions: 0°<α<90°, 90°≤α+β.

[0030] In some embodiments, a direction intersecting the second direction is defined as a third direction, the plurality of microlenses include a plurality of first microlenses and second microlenses arranged at intervals, each first microlens extends along the third direction, and each second microlens extends along the second direction.

[0031] In some embodiments, the light-emitting layer arranged at intervals includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit;

[0032] Along the first direction, the orthographic projection of the first microlens on the plane where the light-emitting device layer is located is located between the orthographic projections of the adjacent first light-emitting unit and the second light-emitting unit on the plane where the light-emitting device layer is located, and the orthographic projection of the second microlens on the plane where the light-emitting device layer is located is located between the orthographic projections of the adjacent second light-emitting unit and the third light-emitting unit on the plane where the light-emitting device layer is located.

[0033] In some embodiments, the material of the microlens includes an inorganic material, and the inorganic material includes any one of epoxy resin, acrylic, SiO2 material, and SiON material, or a mixture of several of them.

[0034] In some embodiments, the material of the planar layer includes organic material and / or organic-inorganic hybrid material.

[0035] In some embodiments, the first refractive index n1 and the second refractive index n2 satisfy: 1.3≤n1≤1.6, 1.5≤n2≤1.9.

[0036] In some embodiments, the orthographic projection of the planar layer on the plane where the cross section is located completely covers the orthographic projection of the microlens on the plane where the cross section is located.

[0037] In some embodiments, the display panel further includes an encapsulation layer; the encapsulation layer is located between the light emitting device layer and the light extraction layer.

[0038] In some embodiments, the orthographic projection of the planar layer on the plane where the cross section is located only covers the orthographic projection of the microlens on the plane where the cross section is located; the light extraction layer also includes a portion located between the microlens and the planar layer to separate the microlens and the planar layer.

[0039] In some embodiments, the portion between the microlens and the planar layer includes a first inorganic layer, and the first inorganic layer is configured to separate the microlens from the planar layer.

[0040] In some embodiments, the light extraction layer further includes a second inorganic layer, and the second inorganic layer is disposed on a side of the planar layer facing away from the first inorganic layer.

[0041] In some embodiments, the light-emitting device layer further includes a first electrode layer, which covers a side of the light-emitting layer facing the light extraction layer and contacts the pixel definition layer.

[0042] In some embodiments, the light emitting device layer further includes a second electrode layer, and the second electrode layer is located on a side of the light emitting layer facing away from the light extraction layer.

[0043] In some embodiments, the display panel further includes a driving circuit layer and a substrate, wherein:

[0044] The driving circuit layer is located on a side of the light emitting device layer away from the light extraction layer;

[0045] The substrate is located on a side of the driving circuit layer away from the light emitting device layer. Beneficial effects

[0046] A display panel according to an embodiment of the present application includes: a light-emitting device layer and a light extraction layer, wherein the light-emitting device layer includes a light-emitting layer and a pixel definition layer arranged at intervals, the light extraction layer is located on the light-emitting side of the light-emitting layer, the light extraction layer includes a plurality of microlenses and a flat layer, each microlens has a first refractive index n1, the flat layer covers the light-emitting side of the plurality of microlenses, and the surface of the microlenses facing the light-emitting device layer is exposed relative to the flat layer, the flat layer has a second refractive index n2, and satisfies n1<n2, and along the thickness direction of the light-emitting device layer, the projections of each microlens and the pixel definition layer on the plane where the light-emitting device layer is located at least partially overlap. The display panel can improve the front light output intensity of the display panel through the light extraction layer, and at the same time, the light output efficiency of sub-pixels of different colors can be further adjusted by cooperating with the arrayed microlenses in the light extraction layer and the flat layer, thereby improving the brightness consistency of sub-pixels of each color at low brightness, thereby improving color deviation and significantly improving the display effect.

[0047] The following is a further description of the embodiments of the present application with reference to the accompanying drawings and specific embodiments:

[0048] In this application, the display panel refers to a laminated OLED display panel.

[0049] Stacked OLED display panels can utilize tandem devices for light generation. Tandem devices drive multiple light-emitting layers in series, significantly increasing brightness compared to single-layer devices. However, at low brightness levels, because the current density of tandem devices is less than half that of single-layer devices, color point shift is more severe, making stacked OLED display panels more susceptible to noticeable color shift and unevenness. To improve these issues, gamma compensation is often used on stacked OLED display panels. However, conventional gamma compensation methods have several drawbacks. First, gamma compensation involves burning the screen into different blocks and selecting the luminance and chromaticity of one block (usually the center block) as the target values ​​for compensation. Other blocks may still fall short of the set specifications or exhibit noticeable color unevenness and mura. Second, the actual luminous efficiency of different color sub-pixels varies. For example, green (G) sub-pixels typically have higher luminous efficiency, while blue (B) sub-pixels typically have lower luminous efficiency, resulting in a greenish tint at low brightness levels. That is to say, at low brightness, gamma compensation is usually difficult to ensure the consistency of brightness gain of each color sub-pixel, so the stacked OLED display panel still has serious color deviation.

[0050] Furthermore, during the evaporation process of the tandem device's light-emitting layer, the light-emitting layers of adjacent sub-pixels, particularly the red (R) and green (G) sub-pixels, can overlap, creating a leakage circuit. This can cause sub-pixels to light up simultaneously, leading to the problem of adjacent sub-pixels lighting up simultaneously on a monochrome display. Furthermore, when the tandem device's operating temperature fluctuates dramatically, the drive current, which is related to the mobility of the thin-film transistor (TFT), is significantly affected by the operating temperature. This leakage circuit, which can be considered a shunt current outside the original circuit, also causes current fluctuations in this branch during drastic temperature fluctuations. Furthermore, this leakage current is not uniform, exacerbating brightness and color unevenness on the screen and making control more difficult. Therefore, leakage current exacerbates the tandem device's temperature-dependent color shift and affects brightness and color unevenness, leading to even more severe low-brightness color point shifts after gamma compensation.

[0051] Based on the above problems, an embodiment of the present application provides a display panel, which improves the front light output intensity of the display panel by setting a light extraction layer on the light output side of the light-emitting layer. At the same time, the arrayed microlenses in the light extraction layer cooperate with the flat layer to further adjust the light output efficiency of sub-pixels of different colors, thereby improving the brightness consistency of sub-pixels of each color under low brightness, thereby improving the color deviation of the display panel and improving the display effect.

[0052] Please refer to Figures 1 and 2 together. Figure 1 illustrates a cross-sectional structure of a display panel according to an embodiment of the present application, while Figure 2 illustrates a partially enlarged view of area A in Figure 1. The display panel provided by an embodiment of the present application includes a light-emitting device layer 10 and a light extraction layer 20. The light-emitting device layer 10 includes a light-emitting layer 11 and a pixel definition layer 12, spaced apart from each other. The light extraction layer 20 is located on the light-emitting side of the light-emitting layer 11 and includes a plurality of microlenses 21 and a planarization layer 22. Each microlens 21 has a first refractive index n1. The planarization layer 22 completely covers the light-emitting side of the plurality of microlenses 21, with the surfaces of the microlenses 21 facing the light-emitting device layer 10 exposed relative to the planarization layer 22. The planarization layer 22 has a second refractive index n2, satisfying n1 < n2. The thickness direction of the light-emitting device layer 10 is defined as a first direction X. Along the first direction X, the projections of each microlens 21 and the pixel definition layer 12 on the plane of the light-emitting device layer 10 at least partially overlap. For example, the first direction X may be perpendicular to the plane of the light-emitting device layer 10.

[0053] In some examples, the pixel definition layer 12 has a plurality of spaced pixel openings 121, and the light-emitting layer 11 is located within the corresponding pixel openings 121. Each sub-pixel includes a light-emitting layer 11 located within the pixel opening 121. The light-emitting layer 11 comprises at least two layers. The light-emitting device layer 10 may further include a first electrode layer 13 and a second electrode layer 14. The first electrode layer 13 is disposed on a side of the light-emitting layer 11 facing the light extraction layer 20 and in contact with the pixel definition layer 12. The second electrode layer 14 is located on a side of the light-emitting layer 11 facing away from the light extraction layer 20.

[0054] In some examples, the display panel may further include a driving circuit layer 40 and a substrate 50 . The driving circuit layer 40 is located on a side of the light emitting device layer 10 facing away from the light extraction layer 20 . The substrate 50 is located on a side of the driving circuit layer 40 facing away from the light emitting device layer 10 .

[0055] In some examples, the orthographic projection of the microlens 21 on the plane where the light-emitting device layer 10 is located can be completely located within the orthographic projection of the corresponding pixel definition layer 12, or the orthographic projection of the microlens 21 on the plane where the light-emitting device layer 10 is located can also be partially located within the orthographic projection of the corresponding pixel definition layer 12.

[0056] Specifically, both the microlens 21 and the flat layer 22 are made of translucent materials. Because the first refractive index n1 of the microlens 21 is less than the second refractive index n2 of the flat layer 22, a portion of the light emitted by the light-emitting layer 11 is totally reflected when it strikes the interface formed by the microlens 21 and the flat layer 22 at a certain angle, as shown by light path a in Figure 1. Another portion of the light emitted by the light-emitting layer 11 can pass directly through the flat layer 22 and exit, as shown by light path b in Figure 1. Another portion of the light emitted by the light-emitting layer 11, after entering the interior of the microlens 21, can be adjusted at the refractive angle at the interface formed by the microlens 21 and the flat layer 22 before exiting. Therefore, the light extraction layer 20 can play a role in converging light.

[0057] The display panel of the embodiment of the present application can improve the front light output intensity of the display panel through the light extraction layer 20, and at the same time, through the cooperation of the arrayed microlens 21 in the light extraction layer 20 and the flat layer 22, further adjust the light output efficiency of sub-pixels of different colors. For example, the light output efficiency of the green sub-pixel can be reduced, or the efficiency of the red sub-pixel can be increased, so as to improve the brightness consistency of sub-pixels of each color under low brightness, thereby improving color deviation and significantly improving the display effect.

[0058] In some embodiments, the material of the microlens 21 may include an inorganic material, such as epoxy resin, acrylic, SiO2 material, or SiON material, or a mixture thereof. For example, the material of the microlens 21 may be photoresist. This makes the microlens 21 easy to pattern and convenient to manufacture and mold.

[0059] In some embodiments, the material of the planar layer 22 may include an organic material and / or an organic-inorganic hybrid material. For example, the organic material may be a material doped with ZrO2 or TiO2 nanoparticles, or a mixture thereof, and the organic-inorganic hybrid material may be a metalloxane material. Thus, the planar layer 22 may be made of a transparent material with a certain mechanical strength, thereby achieving a better light-collecting effect while providing better packaging for the display panel.

[0060] In some embodiments, the microlens 21 has a first light transmittance T1 , and the planar layer 22 has a second light transmittance T2 , satisfying: 50%≤T1, 80%≤T2.

[0061] In some embodiments, the first refractive index n1 and the second refractive index n2 satisfy the following conditions: 1.3≤n1≤1.6, 1.5≤n2≤1.9. For example, the first refractive index n1 may be any one or both of 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, and 1.6. The second refractive index n2 may be any one or both of 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, and 1.9.

[0062] The microlens 21 and the flat layer 22 can ensure the light focusing effect while taking into account the packaging effect, thus having better practicality.

[0063] Continuing with Figures 1 and 2 , in some embodiments, the orthographic projection of the planar layer 22 on the plane of the display panel's cross section 114 covers at least a portion of the orthographic projection of the microlens 21 on the plane of the cross section 114. This facilitates reducing the thickness of the display panel, better meeting the requirements for thinness and lightness in practical applications.

[0064] In some embodiments, the microlens 21 has a first surface 211 and a second surface 212 arranged opposite each other along a first direction X. The second surface 212 is arranged toward the pixel definition layer 12, and the first surface 211 is arranged away from the pixel definition layer 12. The lateral direction of the light-emitting device layer 10 is defined as a second direction Y. Along the second direction Y, the first surface 211 has a first dimension L1, and the second surface 212 has a second dimension L2, such that L1 < L2. For example, the second direction Y can be parallel to the plane of the light-emitting device layer 10.

[0065] In some examples, the first surface 211 and the second surface 212 may both be planes parallel to the plane where the light emitting device layer 10 is located. The first surface 211 and the second surface 212 may both be rectangular in shape.

[0066] In some examples, assuming that the orthographic projection of the microlens 21 on the plane of the light-emitting device layer 10 is completely within the orthographic projection of the corresponding pixel definition layer 12, the pixel definition layer 12 has a fourth surface 122 facing the second surface 212, and the central axis of the second surface 212 may not coincide with the central axis of the fourth surface 122. Along the second direction Y of the light-emitting device layer 10, the fourth surface 122 has a fifth dimension L5, and the second dimension L2 of the second surface 212 may be greater than the fifth dimension L5. When the second dimension L2 of the second surface 212 is greater than the fifth dimension L5, on the side of the pixel definition layer 12 facing any pixel along the second direction Y, the second surface 212 may extend beyond the fourth surface 122, and have an offset d along the second direction Y, satisfying 0μm≤d≤2μm. Exemplarily, the offset d can be any one or any two of 0 μm, 0.2 μm, 0.4 μm, 0.6 μm, 0.8 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, and 2.0 μm. In this way, the microlens 21 is slightly offset in the direction of pixel light emission, which is more conducive to the wiring arrangement within the surface. In addition, it is understandable that the second surface 212 and the fourth surface 122 can also be coaxially arranged. The second dimension L2 of the second surface 212 can also be less than or equal to the fifth dimension L5. There is no specific limitation on this.

[0067] In some examples, the microlens 21 further includes a third surface 213 connected between the first surface 211 and the second surface 212. The third surface 213 is located within the light-emitting range of the corresponding light-emitting layer 11. An angle α is formed between the third surface 213 and the second surface 212, and the light-emitting layer 11 has a maximum light-emitting angle β, satisfying the following conditions: 0° < α < 90°, 90° ≤ α + β. The maximum light-emitting angle β is the angle between the maximum-angled outgoing light ray and the normal c perpendicular to the plane of the light-emitting device layer 10.

[0068] In other words, the third surface 213 can be parallel to the light ray b with the highest angle emitted by the light-emitting layer 11, or can be at a certain angle to the light ray b with the highest angle emitted by the light-emitting layer 11. In this way, when the third surface 213 acts as a total reflection surface, it can ensure that more light emitted by the light-emitting layer 11 is reflected, thereby greatly improving the light extraction efficiency of the corresponding pixel.

[0069] In some examples, the third surface 213 is a plane. In this way, the cross-section of the microlens 21 in the XZ plane formed by the first direction X and the second direction Y is a trapezoid, which can better focus light to the front of the display panel and reduce the light reflected back into the display panel, thereby achieving a better focusing effect.

[0070] In other examples, the third surface 213 may also be a curved surface, and the bending direction of the curved surface may be toward the inside of the microlens 21 or toward the outside of the microlens 21, which is not specifically limited.

[0071] It will be appreciated that, in the embodiment of the present application, a plurality of microlenses 21 constitute a microlens array and are disposed around corresponding sub-pixels. Parameters such as the first dimension L1 of the first surface 211, the second dimension L2 of the second surface 212, the shape of the first surface 211, the shape of the second surface 212, the shape of the third surface 213, and the angle α between the extension direction of the third surface 213 and the second surface 212 of each microlens 21 can all vary. The spacing between the microlenses 21 can be the same or different. The shapes and sizes of the multiple third surfaces 213 of the same microlens 21 located in different light-emitting layers 11 can also vary. The specific shape, size, and arrangement of the microlenses 21 should be configured and adjusted based on the specific light extraction efficiency requirements of the extracted sub-pixels to meet the requirements of the corresponding optical path. The effects of film thickness on light extraction, packaging, and mechanical properties should also be considered. In actual production, the specific design can be based on the dimensions of the mounting substrate and the corresponding array substrate. A larger total reflection interface area results in higher light-collecting efficiency. In this way, the light extraction layer 20 of the embodiment of the present application can be suitable for different application scenarios such as medium and small-sized and curved display screens.

[0072] Continuing with Figures 1 and 2 , in some embodiments, the orthographic projection of the planar layer 22 on the plane of the cross section 114 completely covers the orthographic projection of the microlenses 21 on the plane of the cross section 114. In this case, the plurality of microlenses 21 and the planar layer 22 are disposed on the same layer, and the plurality of microlenses 21 are located within the planar layer 22. The second surfaces 212 of the microlenses 21 are not covered by the planar layer 22. The planar layer 22 covers the plurality of microlenses 21 and contacts the first surfaces 211 and the third surfaces 213 of the microlenses 21.

[0073] In some embodiments, the display panel of the embodiment of the present application may further include an encapsulation layer 30 , which is located between the light emitting device layer 10 and the light extraction layer 20 .

[0074] In some examples, the encapsulation layer 30 has a first region 31 and a second region 32 spaced apart on a side facing away from the light-emitting device layer 10, with the microlens 21 located in the first region 31. The second region 32 is located corresponding to the pixel opening 121. The second surface 212 is attached to the first region 31, and the planar layer 22 is in contact with the second region 32.

[0075] For example, the central axis of the second region 32 may be coaxial with the central axis of the corresponding pixel opening 121 .

[0076] Specifically, the encapsulation layer 30 is light-transmissive. A resonant cavity is typically formed within the encapsulation layer 30 , whereby a portion of the light emitted by the light-emitting layer 11 undergoes continuous total reflection within the encapsulation layer 30 . Ultimately, after reaching a light-emitting angle, the light passes through the interface between the encapsulation layer 30 and the planar layer 22 and exits the display panel through the planar layer 22 .

[0077] In some examples, when both the first surface 211 and the second surface 212 are parallel to the plane of the light-emitting device layer 10, the microlens 21 has a first height h1 μm along the first direction X. The pixel definition layer 12 has a second height h2 μm along the first direction X, and the encapsulation layer 30 has a third height h3 μm along the first direction X, satisfying the following: h1 = δ × (h2 + h3), 0.5 ≤ δ ≤ 1. Exemplarily, δ is in the range of 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0, or any two of these. The second height h2 is in the range of 5 to 20 μm, for example, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, or 20 μm, or any two of these. The third height h3 may be 20 μm.

[0078] Through the above-described embodiment, the display panel can be encapsulated by the encapsulation layer 30 to isolate it from corrosion caused by moisture and other factors. At the same time, the light extraction layer 20 improves the front light intensity. By adjusting the shape and distribution of the arrayed microlenses 21, the light extraction efficiency of different color sub-pixels can be specifically adjusted. This can improve the brightness consistency of each color sub-pixel at low brightness, thereby improving color shift and significantly enhancing the display effect. In addition, the light extraction layer 20 is located on the side of the encapsulation layer 30 facing away from the light-emitting device layer 10, resulting in a simple film structure and easy processing in different steps.

[0079] Please refer to Figures 3 and 4 together. Figure 3 illustrates another cross-sectional structure of the display panel of an embodiment of the present application, and Figure 4 illustrates a locally enlarged structure of area B in Figure 3. In other embodiments, the orthographic projection of the flat layer 22 on the plane where the cross section 114 is located only covers the portion of the orthographic projection of the microlens 21 on the plane where the cross section 114 is located. The light extraction layer 20 also includes a portion located between the microlens 21 and the flat layer 22 to separate the microlens 21 and the flat layer 22. At this time, the flat layer 22 is located on the side of the multiple microlenses 21 away from the light-emitting device layer 10, and the multiple microlenses 21 and the flat layer 22 are layered.

[0080] In some examples, the side of the first electrode layer 13 facing away from the light-emitting layer 11 includes spaced third regions 131. The side of the microlens 21 facing the pixel definition layer 12 extends through the third regions 131 and contacts the pixel definition layer 12. In other words, the second surface 212 extends through the third regions 131 and is attached to the fourth surface 122 of the pixel definition layer 12. In this way, the microlens 21 can fully block the leakage path between adjacent sub-pixels, thereby improving brightness and color unevenness and color shift caused by leakage, further enhancing the display quality of the display panel.

[0081] In some embodiments, the portion between the microlens 21 and the planar layer 22 may include a first inorganic layer 23, and the first inorganic layer 23 is located between the microlens 21 and the planar layer 22. In other words, the first inorganic layer 23 covers the first electrode layer 13 and the microlens 21, and the planar layer 22 covers the side of the first inorganic layer 23 facing away from the light-emitting device layer 10 and the microlens 21. The first inorganic layer 23 can separate the microlens 21 and the planar layer 22.

[0082] In some examples, the first inorganic layer 23 is light-transmissive. Along the first direction X, the first inorganic layer 23 has a thickness t, satisfying t≤5 μm.

[0083] In some examples, the first inorganic layer 23 has a third refractive index n3, satisfying n3=n1. Thus, the first inorganic layer 23 and the microlenses 21 together form a continuous low-refractive-index film layer, and the interface between the first inorganic layer 23 and the planar layer 22 is configured as a total reflection interface. This significantly reduces film thickness and reduces manufacturing difficulty.

[0084] In other examples, the first inorganic layer 23 has a third refractive index n3, satisfying n3=n2. Thus, the first inorganic layer 23 and the planar layer 22 together form a high-refractive-index film layer, and the interface between the microlens 21 and the first inorganic layer 23 is configured as a total internal reflection interface. In other examples, the third refractive index n3 can also satisfy n1≤n3≤n2, and the specific setting can be determined as needed.

[0085] In some embodiments, the light extraction layer 20 of the embodiment of the present application may further include a second inorganic layer 24 , and the second inorganic layer 24 is disposed on a side of the planar layer 22 facing away from the first inorganic layer 23 .

[0086] Through the above-mentioned display panel, the display panel uses the light extraction layer 20 to increase the front light intensity, and adjusts the shape and distribution of the arrayed microlenses 21 to specifically adjust the light extraction efficiency of different color sub-pixels, which can improve the brightness consistency of each color sub-pixel under low brightness, thereby improving color deviation and significantly improving the display effect. In addition, the microlens 21 is attached to the third area 131 of the pixel definition layer 12, so that the light-emitting layer 11 of adjacent sub-pixels in the light-emitting device layer 10 cannot be overlapped, and has a certain mechanical strength, thereby greatly improving the effect of leakage on color deviation. In addition, the first inorganic layer 23, the flat layer 22 and the second inorganic layer 24 can together form a packaging structure, and can also play a packaging role in isolating water vapor and other erosions. At the same time, there is no need to set up an additional packaging layer 30, further reducing the overall thickness of the display panel.

[0087] The display panel of the embodiment of the present application is described below from a top view.

[0088] Please refer to Figure 5, which shows a top view of the display panel of an embodiment of the present application. The cross-sectional structure shown in Figure 1 and / or Figure 3 may correspond to the structure after being cut along the LL direction in Figure 5. In some embodiments, the display panel may further include a support column 60 for supporting the film layer. The direction intersecting with the second direction Y is defined as the third direction Z. The plurality of microlenses 21 may include a plurality of first microlenses 214 and second microlenses 215 arranged at intervals, each first microlens 214 may extend along the third direction Z, and each second microlens 215 may extend along the second direction Y. Exemplarily, the second direction Y and the third direction Z are both parallel to the plane where the light-emitting device layer 10 is located, and the second direction Y and the third direction Z are perpendicular to each other.

[0089] In some examples, each first microlens 214 has a third size L3 along the third direction Z, and each second microlens 215 has a fourth size L4 along the second direction Y, satisfying: L4<L3.

[0090] In some embodiments, the spaced-apart light-emitting layer 11 may include a first light-emitting unit 111, a second light-emitting unit 112, and a third light-emitting unit 113. Along the first direction X, the orthographic projection of the first microlens 214 on the plane where the light-emitting device layer 10 is located is located between the orthographic projections of the adjacent first light-emitting unit 111 and the second light-emitting unit 112 on the plane where the light-emitting device layer 10 is located, and the orthographic projection of the second microlens 215 on the plane where the light-emitting device layer 10 is located is located between the orthographic projection of the adjacent third light-emitting unit 113 on the plane where the light-emitting device layer 10 is located and the orthographic projection of the second light-emitting unit 112 on the plane where the light-emitting device layer 10 is located, and / or, between the orthographic projection of the adjacent third light-emitting unit 113 and the first light-emitting unit 111 on the plane where the light-emitting device layer 10 is located. Exemplarily, the first light-emitting unit 111 is a green light-emitting layer, the second light-emitting unit 112 is a red light-emitting layer, and the third light-emitting unit 113 is a blue light-emitting layer.

[0091] It is understood that the orthographic projection of the first microlens 214 on the plane where the light-emitting device layer 10 is located may not overlap at all with the orthographic projections of the two adjacent light-emitting layers 11 on the plane where the light-emitting device layer 10 is located, or may partially overlap with at least one of the orthographic projections of the two adjacent light-emitting layers 11 on the plane where the light-emitting device layer 10 is located. The orthographic projection of the second microlens 215 on the plane where the light-emitting device layer 10 is located may not overlap at all with the orthographic projections of the two adjacent light-emitting layers 11 on the plane where the light-emitting device layer 10 is located, or may partially overlap with at least one of the orthographic projections of the two adjacent light-emitting layers 11 on the plane where the light-emitting device layer 10 is located.

[0092] For example, the third size L3 of each first microlens 214 along the third direction Z may be larger than the larger one of the size of the first light emitting unit 111 along the third direction Z and the size of the second light emitting unit 112 along the third direction Z.

[0093] By setting the microlens 21 in the above manner, the leakage path between the first light-emitting unit 111 and the second light-emitting unit 112 can be fully blocked, thereby avoiding the problem of adjacent sub-pixels being brightened secretly due to leakage. On the basis of satisfying the luminous efficiency regulation of the three-color light-emitting layer 111, for the third light-emitting unit 113 with low luminous efficiency, there is no need to completely block the leakage path, and a part of the space can be reserved for convenient wiring, so the layout is more flexible.

[0094] 6 , which illustrates another top view of the display panel according to an embodiment of the present application. In other embodiments, each first microlens 214 has a third size L3 along the third direction Z, and each second microlens 215 has a fourth size L4 along the second direction Y, satisfying: L3<L4.

[0095] In some examples, the spaced-apart light-emitting layer 11 may include a first light-emitting unit 111, a second light-emitting unit 112, and a third light-emitting unit 113. Along the first direction X, the orthographic projection of the first microlens 214 on the plane where the light-emitting device layer 10 is located is located between the orthographic projection of the adjacent first light-emitting unit 111 and the orthographic projection of the second light-emitting unit 112 on the plane where the light-emitting device layer 10 is located. The orthographic projection of the second microlens 215 on the plane where the light-emitting device layer 10 is located is located between the orthographic projection of the third light-emitting unit 113 on the plane where the light-emitting device layer 10 is located and the orthographic projection of the second light-emitting unit 112 on the plane where the light-emitting device layer 10 is located, and is located between the orthographic projection of the third light-emitting unit 113 on the plane where the light-emitting device layer 10 is located and the orthographic projection of the first light-emitting unit 111 on the plane where the light-emitting device layer 10 is located. Exemplarily, the first light-emitting unit 111 is a green light-emitting layer, the second light-emitting unit 112 is a red light-emitting layer, and the third light-emitting unit 113 is a blue light-emitting layer.

[0096] It is understood that the orthographic projection of the first microlens 214 on the plane where the light-emitting device layer 10 is located may not overlap at all with the orthographic projections of the two adjacent light-emitting layers 11 on the plane where the light-emitting device layer 10 is located, or may partially overlap with at least one of the orthographic projections of the two adjacent light-emitting layers 11 on the plane where the light-emitting device layer 10 is located. The orthographic projection of the second microlens 215 on the plane where the light-emitting device layer 10 is located may not overlap at all with the orthographic projections of the two adjacent light-emitting layers 11 on the plane where the light-emitting device layer 10 is located, or may partially overlap with at least one of the orthographic projections of the two adjacent light-emitting layers 11 on the plane where the light-emitting device layer 10 is located.

[0097] By setting the microlens 21 in the above manner, the leakage path between the first light-emitting unit 111 and the second light-emitting unit 112 can be fully blocked, thereby avoiding the problem of adjacent sub-pixels being secretly illuminated due to leakage. The leakage path between the first light-emitting unit 111 and the third light-emitting unit 113 and the second light-emitting unit 112 and the third light-emitting unit 113 can also be fully blocked. The length of the microlens 21 around the third light-emitting unit 113 along the second direction Y can be increased, which can improve the light extraction efficiency of the third light-emitting unit 113. In addition, the third dimension L3 of the first microlens 214 along the third direction Z is smaller than the fourth dimension L4 of the second microlens 215 along the second direction Y, which is also beneficial to reducing the number of microlenses 21 per unit area.

[0098] Please refer to Figure 7, which illustrates another top view of the display panel of an embodiment of the present application. In some other embodiments, the spaced-apart light-emitting layer 11 may include first light-emitting units 111, second light-emitting units 112, and third light-emitting units 113 of different shapes and sizes. Along the first direction X, the orthographic projection of the first microlens 214 on the plane where the light-emitting device layer 10 is located is located between the orthographic projection of the adjacent first light-emitting unit 111 on the plane where the light-emitting device layer 10 is located and the orthographic projection of the second light-emitting unit 112 on the plane where the light-emitting device layer 10 is located, and the orthographic projection of the second microlens 215 on the plane where the light-emitting device layer 10 is located is located between the orthographic projection of the third light-emitting unit 113 on the plane where the light-emitting device layer 10 is located and the orthographic projection of the second light-emitting unit 112 on the plane where the light-emitting device layer 10 is located, and / or, is located between the orthographic projection of the third light-emitting unit 113 on the plane where the light-emitting device layer 10 is located and the orthographic projection of the first light-emitting unit 111 on the plane where the light-emitting device layer 10 is located. Exemplarily, the first light-emitting unit 111 is a green light-emitting layer, the second light-emitting unit 112 is a red light-emitting layer, and the third light-emitting unit 113 is a blue light-emitting layer.

[0099] Through the above embodiment, the size, spacing and distribution of the micro lenses 21 can be adjusted to flexibly meet the light focusing requirements and leakage blocking requirements of different patterned pixel arrangements, which has high flexibility.

[0100] It can be understood that the display panel of the embodiment of the present application can effectively improve the light extraction efficiency and further improve the color deviation and color unevenness problems under low brightness by adjusting the shape and distribution of the arrayed microlenses 21. At the same time, it can reduce the leakage between adjacent pixels, improve the brightness stealing and overall packaging performance, and comprehensively improve the low-brightness performance of the display panel.

[0101] Accordingly, please refer to FIG8 , which shows a schematic flow chart of a method for manufacturing a display panel according to an embodiment of the present application. The method for manufacturing a display panel according to an embodiment of the present application specifically includes the following steps:

[0102] Step 801 : forming a light-emitting device layer 10 , wherein the light-emitting device layer 10 includes a light-emitting layer 11 and a pixel definition layer 12 .

[0103] Step 802: A light extraction layer 20 is formed on the light-emitting side of the light-emitting layer 11. The light extraction layer 20 includes a plurality of microlenses 21 and a flat layer 22. Each microlens 21 has a first refractive index n1. The flat layer 22 completely covers the light-emitting side of the plurality of microlenses 21, and the surface of the microlenses 21 facing the light-emitting device layer 10 is exposed relative to the flat layer 22. The flat layer 22 has a second refractive index n2, and n1 < n2. The thickness direction of the light-emitting device layer 10 is defined as a first direction X. Along the first direction X, the projections of each microlens 21 and the pixel definition layer 12 on the plane where the light-emitting device layer 10 is located at least partially overlap.

[0104] In some embodiments, the orthographic projection of the planar layer 22 on the plane where the cross section 114 of the display panel is located covers at least a portion of the orthographic projection of the microlens 21 on the plane where the cross section 114 is located.

[0105] In some embodiments, a light extraction layer 20 is formed on the light-emitting side of the light-emitting layer 11, comprising:

[0106] forming a microlens layer on the light-emitting side of the light-emitting layer 11;

[0107] The microlens layer is etched to form a plurality of microlenses 21. The microlens 21 has a first surface 211 and a second surface 212 arranged opposite to each other along a first direction X, the second surface 212 is arranged toward the pixel definition layer 12, and the first surface 211 is arranged away from the pixel definition layer 12. The lateral direction of the light-emitting device layer 10 is defined as a second direction Y. Along the second direction Y, the first surface 211 has a first size L1, and the second surface 212 has a second size L2, satisfying L1<L2.

[0108] A planarization layer 22 is formed on the plurality of microlenses 21 .

[0109] In some embodiments, the microlens 21 further has a third surface 213 connected between the first surface 211 and the second surface 212, and the third surface 213 is located within the light-emitting range of the corresponding light-emitting layer 11; there is an angle α between the third surface 213 and the second surface 212, and the light-emitting layer 11 has a maximum light-emitting angle β, satisfying: 0°<α<90°, 90°≤α+β.

[0110] In some embodiments, a direction intersecting the second direction Y is defined as a third direction Z; the microlens layer is etched to form a plurality of microlenses 21, including:

[0111] The microlens layer is etched to form a plurality of first microlenses 214 and second microlenses 215 arranged at intervals. Each first microlens 214 extends along the third direction Z, and each second microlens 215 extends along the second direction Y.

[0112] In some embodiments, the light-emitting layer 11 arranged at intervals includes a first light-emitting unit 111 , a second light-emitting unit 112 and a third light-emitting unit 113 ;

[0113] Along the first direction X, the orthographic projection of the first microlens 214 on the plane where the light-emitting device layer 10 is located is located between the orthographic projections of the adjacent first light-emitting unit 111 and the second light-emitting unit 112 on the plane where the light-emitting device layer 10 is located, and the orthographic projection of the second microlens 215 on the plane where the light-emitting device layer 10 is located is located between the orthographic projections of the adjacent second light-emitting unit 112 and the third light-emitting unit 113 on the plane where the light-emitting device layer 10 is located.

[0114] In some embodiments, the material of the microlens 21 includes an inorganic material, and the inorganic material includes any one of epoxy resin, acrylic, SiO 2 material, and SiON material, or a mixture of several of them.

[0115] In some embodiments, the material of the planar layer 22 includes organic materials and / or organic-inorganic hybrid materials.

[0116] In some embodiments, the first refractive index n1 and the second refractive index n2 satisfy: 1.3≤n1≤1.6, 1.5≤n2≤1.9.

[0117] In some embodiments, forming a planar layer 22 on the plurality of microlenses 21 includes:

[0118] A flat layer 22 is filled on one side of the plurality of microlenses 21 away from the light emitting device layer 10 , and the orthographic projection of the flat layer 22 on the plane where the cross section 114 is located completely covers the orthographic projection of the microlenses 21 on the plane where the cross section 114 is located.

[0119] In some embodiments, before forming a plurality of microlenses 21 on the light-emitting side of the light-emitting layer 11, the preparation method further includes:

[0120] The encapsulation layer 30 is formed between the light emitting device layer 10 and the light extraction layer 20 .

[0121] In some embodiments, forming a planar layer 22 on the plurality of microlenses 21 includes:

[0122] An isolation portion is formed on a side of the plurality of micro lenses 21 facing away from the light emitting device layer 10;

[0123] A flat layer 22 is formed on the side of the isolation portion away from the plurality of microlenses 21 . The orthographic projection of the flat layer 22 on the plane where the cross section 114 is located only covers the orthographic projection of the microlenses 21 on the plane where the cross section 114 is located. The isolation portion separates the microlenses 21 and the flat layer 22 .

[0124] In some embodiments, the isolation portion includes a first inorganic layer 23 configured to separate the microlens 21 from the planar layer 22 .

[0125] In some embodiments, the preparation method further comprises:

[0126] The second inorganic layer 24 is formed on the side of the planar layer 22 facing away from the first inorganic layer 23 .

[0127] In some embodiments, forming the light emitting device layer 10 includes:

[0128] A first electrode layer 13 is formed on a side of the light emitting layer 11 facing the light extraction layer 20 . The first electrode layer 13 covers the light emitting layer 11 and contacts the pixel definition layer 12 .

[0129] In some embodiments, forming the light emitting device layer 10 further includes:

[0130] The second electrode layer 14 is formed on a side of the light emitting layer 11 facing away from the light extraction layer 20 .

[0131] In some embodiments, before forming the light-emitting device layer 10, the preparation method further includes:

[0132] Providing a substrate 50;

[0133] The driving circuit layer 40 is formed on a side of the substrate 50 facing the light emitting device layer 10 . The driving circuit layer 40 is located on a side of the light emitting device layer 10 facing away from the light extraction layer 20 .

[0134] It can be understood that the preparation method of the display panel of the embodiment of the present application can improve the front light output intensity of the display panel by preparing a light extraction layer 20, and at the same time, by preparing an arrayed microlens 21 in the light extraction layer 20 and cooperating with the flat layer 22, the light output efficiency of different color sub-pixels can be further adjusted, which can improve the brightness consistency of each color sub-pixel under low brightness, thereby improving color deviation and significantly improving the display effect of the prepared display panel.

[0135] Accordingly, the display device provided in the embodiment of the present application includes the display panel as described in any of the above embodiments. The display device can be a mobile phone, a computer, a television, a smart wearable device, etc., which is not particularly limited in this embodiment.

[0136] It can be understood that the display device of the embodiment of the present application can improve the front light output intensity of the display panel through the light extraction layer 20, and at the same time, through the cooperation of the arrayed microlens 21 in the light extraction layer 20 and the flat layer 22, further adjust the light output efficiency of sub-pixels of different colors, thereby improving the brightness consistency of sub-pixels of each color under low brightness, thereby improving color deviation and having a better display effect.

[0137] The above is a detailed introduction to a display panel and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 application.

Claims

1. A display panel, comprising: A light-emitting device layer, the light-emitting device layer comprising a light-emitting layer and a pixel definition layer; A light extraction layer, the light extraction layer is located at the light emitting side of the light emitting layer, the light extraction layer comprises a plurality of microlenses and a flat layer, the microlenses have a first refractive index n1; the flat layer completely covers the light emitting sides of the plurality of microlenses, and the surfaces of the microlenses facing the light emitting device layer are exposed relative to the flat layer, the flat layer has a second refractive index n2, and satisfies n1<n2; The thickness direction of the light-emitting device layer is defined as a first direction; along the first direction, the projections of each of the microlenses and the pixel definition layer on the plane where the light-emitting device layer is located at least partially overlap.

2. The display panel according to claim 1, wherein, The orthographic projection of the planar layer on the plane where the cross section of the display panel is located covers at least part of the orthographic projection of the microlens on the plane where the cross section is located.

3. The display panel according to claim 1, wherein, The microlens has a first surface and a second surface arranged opposite to each other along the first direction, the second surface is arranged toward the pixel definition layer, and the first surface is arranged away from the pixel definition layer; The lateral direction of the light emitting device layer is defined as a second direction; along the second direction, the first surface has a first size L1, and the second surface has a second size L2, satisfying L1<L2.

4. The display panel according to claim 3, wherein, The microlens also has a third surface connected between the first surface and the second surface; An included angle α is formed between the third surface and the second surface, and the light-emitting layer has a maximum light output angle β, which satisfies: 0°<α<90°, 90°≤α+β.

5. The display panel according to claim 1, wherein, The direction intersecting the second direction is defined as a third direction; the plurality of microlenses include a plurality of first microlenses and second microlenses arranged at intervals, each of the first microlenses extends along the third direction, and each of the second microlenses extends along the second direction.

6. The display panel according to claim 5, wherein, The light-emitting layer includes a first light-emitting unit, a second light-emitting unit and a third light-emitting unit; Along the first direction, the orthographic projection of the first microlens on the plane where the light-emitting device layer is located is located between the orthographic projections of the adjacent first light-emitting unit and the second light-emitting unit on the plane where the light-emitting device layer is located, and the orthographic projection of the second microlens on the plane where the light-emitting device layer is located is located between the orthographic projections of the adjacent second light-emitting unit and the third light-emitting unit on the plane where the light-emitting device layer is located.

7. The display panel according to claim 1, wherein, The material of the microlens includes inorganic material, and the inorganic material includes any one or a mixture of epoxy resin, acrylic, SiO2 material and SiON material.

8. The display panel according to claim 1, wherein, The material of the planar layer includes organic material and / or organic-inorganic hybrid material.

9. The display panel according to claim 1, wherein, The first refractive index n1 and the second refractive index n2 satisfy: 1.3≤n1≤1.6, 1.5≤n2≤1.

9.

10. The display panel according to any one of claims 2-9, wherein, The orthographic projection of the flat layer on the plane where the cross section is located completely covers the orthographic projection of the microlens on the plane where the cross section is located.

11. The display panel according to claim 10, wherein, The display panel further includes: An encapsulation layer is located between the light emitting device layer and the light extraction layer.

12. The display panel according to any one of claims 2-9, wherein, The positive projection of the flat layer on the plane where the cross-section is located only covers a part of the positive projection of the microlens on the plane where the cross-section is located; the light extraction layer further includes a part located between the microlens and the flat layer to separate the microlens and the flat layer.

13. The display panel according to claim 12, wherein, The part located between the microlens and the flat layer includes a first inorganic layer, and the first inorganic layer is configured to separate the microlens and the flat layer.

14. The display panel according to claim 13, wherein, The light extraction layer further includes a second inorganic layer, and the second inorganic layer is disposed on a side of the flat layer facing away from the first inorganic layer.

15. The display panel according to claim 1, wherein, The light-emitting device layer further includes a first electrode layer, and the first electrode layer is disposed on a side of the light-emitting layer facing the light extraction layer and is in contact with the pixel definition layer.

16. The display panel according to claim 15, wherein, The light-emitting device layer further includes a second electrode layer, and the second electrode layer is located on a side of the light-emitting layer facing away from the light extraction layer.

17. The display panel according to claim 1, wherein, The display panel further includes: a driving circuit layer, and the driving circuit layer is located on a side of the light-emitting device layer facing away from the light extraction layer; a substrate, and the substrate is located on a side of the driving circuit layer facing away from the light-emitting device layer.

18. A display device, comprising the display panel according to any one of claims 1-17.

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