Display panel, manufacturing method thereof and display device

Abstract

This application relates to a display panel, including a first optical functional layer and a second optical functional layer. The first optical functional layer includes a plurality of optical pattern portions, each corresponding to at least a portion of the light-emitting elements. The second optical functional layer is stacked on the side of the first optical functional layer away from the display layer group, and the orthographic projection of the second optical functional layer on the substrate covers the orthographic projection of the first optical functional layer on the substrate. The refractive index of the first optical functional layer is greater than that of the second optical functional layer. When light (oblique light emitted by the light-emitting elements) passes through the first optical functional layer with the higher refractive index and enters the second optical functional layer, refraction occurs, causing the oblique light to transform into light that is closer to the positive viewing angle, that is, the light converges towards the center of the light-emitting elements, thereby achieving a converging effect of the display light and thus improving the display brightness of the display panel. A method for manufacturing a display panel and a display device are also provided.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] OLED (Organic Light-Emitting Diode) display panels are being used more and more widely due to their advantages such as self-illumination, high contrast, and flexibility.

[0003] The light emitted from the light-emitting elements of an OLED display panel passes through multiple film layers before reaching the light-emitting surface of the display panel. Each film layer has a certain absorption effect on the light, resulting in a reduction in the brightness of the light reaching the light-emitting surface, which affects the display brightness of the display panel and thus affects the display effect of the display panel. Summary of the Invention

[0004] Therefore, it is necessary to provide a display panel that can improve the display brightness.

[0005] According to one aspect of this application, a display panel is provided, comprising:

[0006] substrate;

[0007] A display layer assembly, disposed on the substrate, the display layer assembly including a plurality of light-emitting elements; and

[0008] An optical functional layer group is located on the side of the display layer group opposite to the substrate, and the optical functional layer group includes:

[0009] The first optical functional layer includes a plurality of optical pattern portions, wherein the plurality of optical pattern portions are disposed in a one-to-one correspondence with at least a portion of the light-emitting elements;

[0010] A second optical functional layer is stacked on the side of the first optical functional layer away from the display layer group, and the orthogonal projection of the second optical functional layer on the substrate covers the orthogonal projection of the first optical functional layer on the substrate.

[0011] The refractive index of the first optical functional layer is greater than that of the second optical functional layer.

[0012] In the aforementioned display panel, since the refractive index of the first optical functional layer is greater than that of the second optical functional layer, when light (oblique light emitted by the light-emitting element) passes through the first optical functional layer with a higher refractive index and enters the second optical functional layer, refraction occurs, causing the oblique light to transform into light that is more inclined towards the positive viewing angle. That is, the light moves closer to the center of the light-emitting element, thereby achieving the effect of converging display light and thus improving the display brightness of the display panel.

[0013] In one embodiment, the optical pattern portion includes a central portion and an edge portion surrounding the central portion, the thickness of the edge portion decreasing from the central portion toward the edge portion.

[0014] In one embodiment, the orthographic projection of the edge portion onto the substrate is offset from that of the light-emitting element.

[0015] In one embodiment, the thickness of the edge portion continuously decreases from the middle portion toward the edge portion to form a slope on the side of the edge portion away from the substrate.

[0016] In one embodiment, the thickness of the middle portion is uniformly set, and the surface of the edge portion facing away from the substrate is constructed as an outwardly convex arc-shaped slope.

[0017] In one embodiment, the slope angle γ of the slope surface satisfies the condition: 15 degrees ≤ γ ≤ 50 degrees.

[0018] In one embodiment, the thickness of the edge portion continuously decreases along the direction from the middle portion toward the edge portion;

[0019] The optical pattern portion has an outwardly convex arc-shaped surface on the side of its surface facing away from the substrate.

[0020] In one embodiment, the orthographic projection of the optical pattern portion on the substrate covers the orthographic projection of the corresponding light-emitting element on the substrate.

[0021] In one embodiment, the display layer group includes a pixel definition layer that defines a plurality of pixel opening regions and non-opening regions surrounding the pixel opening regions, and the light-emitting element is disposed in the pixel opening regions;

[0022] The orthographic projection of the optical pattern portion onto the substrate covers the orthographic projection of the corresponding pixel opening area onto the substrate, and overlaps with the orthographic projection of the non-opening area onto the substrate.

[0023] In one embodiment, the second optical functional layer directly covers the surface of the first optical functional layer on the side facing away from the display layer group.

[0024] In one embodiment, the display panel further includes a color resist layer assembly located on the side of the display layer assembly facing away from the substrate, the color resist layer assembly comprising:

[0025] A light-shielding color-blocking layer has multiple first openings, and the multiple first openings are arranged in a one-to-one correspondence with at least a portion of the light-emitting elements;

[0026] Multiple color filters are disposed in the multiple first openings;

[0027] Wherein, the color filter is located on the side of the second optical functional layer opposite to the display layer group; or

[0028] The color filter is located between the corresponding optical pattern portion and the second optical functional layer, and the refractive index of the optical pattern portion is greater than the refractive index of the color filter.

[0029] In one embodiment, each of the first openings is directly opposite the corresponding light-emitting element, and the minimum distance between the edge of the orthographic projection of the light-emitting element on the substrate and the edge of the orthographic projection of the corresponding optical pattern portion on the substrate is a first distance L1.

[0030] The minimum distance between the edge of the orthographic projection of the light-emitting element on the substrate and the edge of the orthographic projection of the first opening on the substrate is the second distance L2;

[0031] The first distance and the second distance satisfy the condition: L1 < L2.

[0032] In one embodiment, the range of the first distance is: 1 micrometer ≤ L1 ≤ 5 micrometers; the range of the second distance is:

[0033] 5 micrometers ≤ L2 ≤ 9 micrometers.

[0034] In one embodiment, the display panel further includes an encapsulation layer located between the display layer group and the optical functional layer group;

[0035] The refractive index of the first optical functional layer is less than or equal to the refractive index of the encapsulation layer.

[0036] According to another aspect of this application, a method for manufacturing a display panel is provided, comprising:

[0037] Provide a substrate;

[0038] A display layer group and an optical functional layer group are sequentially formed on the substrate. The display layer group includes a plurality of light-emitting elements. The optical functional layer group is located on the side of the display layer group away from the substrate. The optical functional layer group includes a first optical functional layer and a second optical functional layer stacked on the side of the first optical functional layer away from the display layer group. The first optical functional layer includes a plurality of optical pattern portions, and the plurality of optical pattern portions are disposed in a one-to-one correspondence with at least a portion of the light-emitting elements. The orthographic projection of the second optical functional layer on the substrate covers the orthographic projection of the first optical functional layer on the substrate. The refractive index of the first optical functional layer is greater than the refractive index of the second optical functional layer.

[0039] According to another aspect of this application, a display device is provided, including a display panel as described in any of the above embodiments. Attached Figure Description

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0041] Figure 1 This is a cross-sectional schematic diagram of a display panel according to one embodiment of this application;

[0042] Figure 2 This is a cross-sectional schematic diagram of a display panel according to another embodiment of this application;

[0043] Figure 3 This is a cross-sectional schematic diagram of the display panel in another embodiment of this application;

[0044] Figure 4 for Figure 3 The diagram shown is a cross-sectional view of the display panel after the second optical functional layer has been removed.

[0045] Figure 5 This is a cross-sectional schematic diagram of a display panel according to one embodiment of this application;

[0046] Figure 6 for Figure 5 The diagram shown is a cross-sectional view of the display panel after the second optical functional layer has been removed.

[0047] Figure 7 This is a cross-sectional schematic diagram of a display panel in related technologies;

[0048] Figure 8 This is a partial cross-sectional schematic diagram of a display panel in one embodiment of the related art;

[0049] Figure 9 for Figure 2 and Figure 8 Comparison of the gain simulation effect of the display panel in the illustrated embodiment;

[0050] Figure 10 This is a schematic diagram of the structure of the thin-film transistor in a display panel shown in one embodiment of this application;

[0051] Figure 11 This is a flowchart illustrating a method for manufacturing a display panel according to an embodiment of this application.

[0052] Figure 12 This is a schematic diagram of the structure of a display device according to an embodiment of this application. Detailed Implementation

[0053] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0055] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0056] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0057] Furthermore, in the instruction manual, the phrase "planar distribution diagram" refers to the diagram when the target part is viewed from above, and the phrase "cross-sectional diagram" refers to the diagram when the target part is viewed from the side as a cross-section taken by vertically cutting the target part.

[0058] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0059] With the rapid development of display technology, OLED display panels, compared to traditional LCD panels, have advantages such as high resolution, high color gamut, and low power consumption, and have been widely used in people's lives. However, in related technologies, after the light emitted by the light-emitting element passes through the encapsulation layer and other layers, the light has a specific directionality, resulting in low utilization of the light emitted from the screen and poor color accuracy.

[0060] Therefore, it is necessary to provide a display panel that can improve the light extraction rate, thereby increasing the display brightness.

[0061] The display panel in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0062] Figure 1 A cross-sectional schematic diagram of a display panel according to an embodiment of this application is shown; Figure 2 A cross-sectional schematic diagram of a display panel according to another embodiment of this application is shown; Figure 3 A cross-sectional schematic diagram of a display panel according to another embodiment of this application is shown. For ease of description, the accompanying drawings only show structures relevant to the embodiments of this application.

[0063] Please see the appendix Figure 1-3 The display panel disclosed in at least one embodiment of this application includes a substrate 10, a display layer group 20, and an optical functional layer group (not shown in the figure).

[0064] Display layer group 20 is disposed on substrate 10, and display layer group 20 includes a plurality of light-emitting elements 21. Optical functional layer group is located on the side of display layer group 20 away from substrate 10. Optical functional layer group includes a first optical functional layer (not shown) and a second optical functional layer 44 stacked on the side of the first optical functional layer away from display layer group 20. The first optical functional layer includes a plurality of optical pattern portions 42, and the plurality of optical pattern portions 42 are disposed in a one-to-one correspondence with at least a portion of the light-emitting elements 21. The orthographic projection of the second optical functional layer 44 on the substrate covers the orthographic projection of the first optical functional layer on the substrate.

[0065] It should be noted that the one-to-one correspondence between the multiple optical pattern sections 42 and at least some of the light-emitting elements 21 refers to the one-to-one correspondence in quantity between the optical pattern sections 42 and at least some of the light-emitting elements 21, and the corresponding positions of the optical pattern sections 42 and the light-emitting elements 21, so that the light emitted by the light-emitting elements 21 can pass through the optical pattern sections 42 and exit. For example, in one embodiment, the orthographic projection of the optical pattern section 42 on the substrate 10 completely covers the orthographic projection of the corresponding light-emitting element 21 on the substrate 10. In this way, it is ensured as much as possible that the light emitted by the light-emitting element 21 can pass through the optical pattern section 42 and the second optical functional layer 44 sequentially and exit.

[0066] It should also be noted that the stacked arrangement of the first optical functional layer and the second optical functional layer 44 means that the first optical functional layer and the second optical functional layer 44 can be stacked in direct contact, or they can be stacked without direct contact, such as with a central film layer between the first optical functional layer and the second optical functional layer 44. In summary, the second optical functional layer 44 is located on the side of the first optical functional layer away from the display layer group 20. For example, in one embodiment, such as... Figure 1 and Figure 2As shown, the second optical functional layer 44 directly covers the first optical functional layer. As another implementation, such as... Figures 3-5 As shown, the second optical functional layer 44 is located above the first optical functional layer, but it does not directly cover the surface of the first optical functional layer that is away from the display layer group 20.

[0067] In the embodiments of this application, the refractive index of the first optical functional layer is greater than the refractive index of the second optical functional layer 44. Because the refractive index of the first optical functional layer is greater than the refractive index of the second optical functional layer 44, such as... Figure 1 and Figure 2 As shown, when light (oblique light emitted by light-emitting element 21) passes through the optical pattern section 42 with a high refractive index, it is refracted, causing the oblique light to be transformed into light that is more inclined to the positive viewing angle, that is, the light moves closer to the center line of light-emitting element 21, thereby achieving the effect of converging display light, thereby improving the brightness of the positive viewing angle and improving the display brightness of the display panel.

[0068] For example, the material of the first optical functional layer may be polytetrafluoroethylene or polystyrene, and the material of the second optical functional layer 44 may be at least one of acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, or other materials with lower refractive index, such as fluorides.

[0069] It is understandable that by making the refractive index of the first optical functional layer greater than that of the second optical functional layer 44, the light emission rate of the display panel can be improved to a certain extent by refracting and converging light. The brightness and color of the display panel are significantly improved when viewed from the front. However, the problem of lower brightness at non-frontal viewing angles is still unavoidable. When viewing the display from a wide angle, the original colors cannot be seen, only a blurry image, or even complete black or white, which affects the user experience of the product.

[0070] Based on this, such as Figures 1-4As shown, in some embodiments, the optical pattern portion 42 includes a central portion A and an edge portion B surrounding the central portion A, with the thickness of the edge portion B decreasing from the central portion A to the edge portion B. It should be understood that when the thickness of each portion of the optical pattern portion 42 is the same, the transmittance of each portion is also the same. Based on this, since the optical path of the light emitted by the light-emitting element 21 is shorter and the attenuation is smaller at a normal viewing angle, while the optical path of the light emitted by the light-emitting element 21 is longer and the attenuation is greater at a wide viewing angle, the light emitted at a normal viewing angle passes through the thicker central portion A of the optical pattern portion 42, while the light emitted at a wide viewing angle (side view) passes through the thinner edge portion B of the optical pattern portion 42. This ensures that the brightness of the emitted light at a normal viewing angle and the brightness at a wide viewing angle remain consistent, thus ensuring that the displayed brightness seen by the human eye at both normal and wide viewing angles remains consistent, thereby improving the display quality of the display panel.

[0071] In one implementation, the orthographic projection of the edge portion B of the optical pattern section 42 onto the substrate 10 is offset from that of the light-emitting element 21. Thus, the edge portion B, with its higher transmittance, can further compensate for the significant attenuation caused by the optical path at side viewing angles, thereby ensuring consistent light output brightness across the display panel from both the orthographic and side viewing angles, and guaranteeing display uniformity.

[0072] It should be noted that the thickness of edge portion B decreases from the middle portion A towards edge portion B. This means that the thickness of edge portion B can decrease continuously or intermittently, but the overall trend is one of decreasing thickness. For example, the thickness of edge portion B can continuously decrease from the middle portion A towards edge portion B, forming a slope 420 on the side of edge portion B facing away from the substrate 10. This further ensures that the light output brightness at different viewing angles is consistent with the light output brightness at the front viewing angle, thus improving the display quality of the display panel.

[0073] In some embodiments, such as Figures 1-4 As shown, the thickness of the middle portion A of the optical pattern section 42 is uniform, and the edge portion B of the optical pattern section 42 has an outwardly convex arc-shaped slope 420 on the side facing away from the substrate 10. This allows light emitted from a positive or narrow viewing angle to pass through the middle portion A, while light emitted from a wide viewing angle (side view) passes through the thinner edge portion B of the optical pattern section 42, maintaining consistent brightness between positive / narrow viewing angles and wide viewing angles. Furthermore, the light emitted by the light-emitting element 21 is refracted through the slope 420, reducing the divergence angle of the emitted light and converging it to increase the light output rate, effectively improving the display brightness of the display panel. Additionally, this slope 420 has a larger solid angle, resulting in more light emitted from the positive viewing angle, thus improving light convergence.

[0074] It should be noted that, as Figure 1-4 As shown, in this embodiment, the thickness of the edge portion B of the optical pattern portion 42 gradually decreases from the middle portion A to the edge portion B, forming a slope structure that is an arc-shaped slope 420 that convexes outward in a direction away from the middle portion A of the optical pattern portion 42. It is hoped that, without being limited by theoretical constraints, the inventors of this application have attempted, as... Figure 7 As shown, the edge portion B of the optical pattern section 42, facing away from the substrate 10, is constructed as an arc-shaped slope 420 that convexes towards the middle portion A of the optical pattern section 42. Figure 8 As shown, it illustrates Figure 1-4 and Figure 7 Simulation renderings of two different curved slopes at 420°, with waveform line C representing the settings. Figures 1-4 The light gain curve of the display panel with the arc-shaped slope 420 shown is represented by the waveform line D, which indicates the setting. Figure 7 The diagram shows the light gain curve of the display panel with the curved slope 420. The horizontal axis represents the vertical coordinate of the curved slope 420 in the coordinate system, and the vertical axis represents the light gain of the display panel. Figure 8 As shown, in this embodiment, the peak optical gain corresponding to the arc-shaped slope 420 reaches more than 20%, which is greater than... Figure 7 The peak gain corresponding to the arc-shaped slope 420 shown is 15%. The reason for this is that the solid angle of the light source of the arc-shaped slope 420 in this embodiment is larger, which results in more light rays being emitted at a more positive angle.

[0075] It should be noted that the light intensity of the display panel without the curved slope 420 is β, and the light intensity with the curved slope 420 is δ. The light gain here refers to the light intensity of the emitted light from the display panel, which is the gain ratio between the state with the curved slope 420 and the state without the curved slope 420, i.e., (δ-β) / β.

[0076] In some embodiments, the slope angle γ of the slope 420 satisfies the condition: 15 degrees ≤ γ ≤ 50 degrees. It should be noted that the slope angle of the slope 420 refers to the angle between the tangent of the plane or curved surface of the slope 420 and the plane where the optical pattern portion 42 is located. When the slope angle of the slope 420 is set to 15 degrees to 50 degrees, preferably 45 degrees, when the light emitted by the light-emitting element 21 is refracted by the edge portion B of the optical pattern portion 42, the refracted light tends to be more focused towards the light in front of the viewer, which can achieve a better light-gathering effect, thereby improving the brightness of the display panel in front of the viewer and reducing the power consumption of the display panel.

[0077] In other embodiments, such as Figures 5-6As shown, the surface of the optical pattern portion 42 facing away from the substrate 10 is constructed as an outwardly convex arc-shaped surface. Specifically, the thickness of the middle portion A of the optical pattern portion 42 gradually decreases from the middle position towards the edge, thus forming an arc-shaped slope extending from the middle position to the edge on the surface of the optical pattern portion 42 facing away from the substrate 10. This allows the emitted light at a wide viewing angle (side viewing angle) to exit through the thinner edge portion B of the optical pattern portion 42, ensuring that the emitted light brightness at a normal viewing angle and at a wide viewing angle remains consistent. Furthermore, it can converge the light and improve the light extraction rate, effectively increasing the display brightness of the display panel. In the embodiments of this application, the light-emitting element 21 includes at least an organic light-emitting material layer. As one implementation, the organic light-emitting material layer may include low-molecular-weight organic materials or high-molecular-weight organic materials. The light-emitting element 21 may also include functional film layers such as a hole transport layer, a hole injection layer, an electron transport layer, and an electron injection layer.

[0078] In some embodiments, the orthographic projection of the optical pattern section 42 on the substrate 10 covers the orthographic projection of the corresponding light-emitting element 21 on the substrate 10. This ensures that the light emitted by the light-emitting element 21 can pass through the optical pattern section 42 and the second optical functional layer 44 as much as possible, thereby improving light convergence. It is worth emphasizing that, taking a top-emitting OLED display panel as an example, evaporation materials such as organic light-emitting materials have poor stability and cannot be patterned using traditional etching processes. Instead, an evaporation process with a mask is used. The evaporation process involves placing the evaporation material in a vacuum environment and heating it to evaporate or sublimate the material. A mask assembly is provided between the cavity for evaporating the evaporation material and the display substrate 10 to be evaporated. The mask assembly has mask openings corresponding to the areas to be evaporated, while areas not to be evaporated do not have mask openings. The evaporated or sublimated evaporation material adheres to the display substrate 10 to be evaporated through the mask openings, thereby directly forming a patterned film layer. Ideally, the mask openings of the mask assembly correspond to the positions of the pixel openings used to deposit the organic light-emitting material, allowing the evaporated material to be precisely deposited on the corresponding positions of the display substrate 10. However, the precision of the fine metal mask is at the micrometer level, and the alignment accuracy with the display substrate 10 is extremely high. Typically, when the offset between the position of the mask opening of the fine metal mask and the position of the pixel opening exceeds 5 micrometers, the evaporated organic light-emitting material is prone to color mixing abnormalities during display.

[0079] To ensure deposition accuracy, the area of ​​the pixel opening region is typically larger than the area of ​​the deposited organic light-emitting material layer. Therefore, in some embodiments, the pixel definition layer 26 defines multiple pixel opening regions and non-opening regions surrounding the pixel opening regions. The light-emitting element 21 is disposed in the pixel opening region. The orthographic projection of the optical pattern portion 42 on the substrate 10 covers the orthographic projection of the corresponding pixel opening region on the substrate 10, and overlaps with the orthographic projection of the non-opening region on the substrate 10. In this way, it can be further ensured that the light emitted by the light-emitting element 21 can pass through the first optical functional layer and the second optical functional layer 44 in sequence, thereby improving the light focusing ability.

[0080] It is worth emphasizing that in some related technologies, a color filter layer and a black matrix (BM) are used to form a color resist layer instead of a traditional polarizer. For example... Figure 9 As shown, in related technologies, a display panel typically includes a substrate 01, a driving layer group 02 disposed on the substrate 01, a display layer group located on the side of the driving layer group 02 away from the substrate 01, the display layer group including multiple light-emitting elements 03, and a color resist layer group located on the side of the display layer group away from the substrate 01. The color resist layer group typically includes multiple light-filtering color resists 04 and at least a light-shielding color resist layer 05 surrounding each light-filtering color resist 04. The light-filtering color resists 04 are arranged one-to-one with the light-emitting elements 03 to filter the light emitted by the light-emitting elements 03, allowing light of the corresponding color to pass through while blocking light of other colors from passing through. Furthermore, when ambient light enters the display panel and is reflected by the reflective film layer in the display panel, the light-filtering color resist 04 can filter the reflected light before it is emitted to the light-emitting surface of the display panel, reducing the impact of reflected ambient light on the display effect. Therefore, the color resist layer group can replace a polarizer to achieve the function of adjusting the display light. Furthermore, since existing polarizers typically consist of multiple layers, including a polarizing layer and a protective layer, replacing them with a color resist layer assembly can effectively reduce the number of layers, contributing to a thinner and lighter display panel. However, existing display panels using color resist layer assemblies still suffer from insufficient brightness when viewed directly. Achieving a certain brightness would increase system power consumption and affect product lifespan. Additionally, the light-shielding color resist layer 05 prevents color crosstalk caused by different colors of light emitted from two adjacent color resist layers, thus avoiding impact on display. However, the presence of the light-shielding color resist layer 05 prevents the light emitted by the light-emitting element 03 from achieving a wide light-emitting angle, affecting the display panel's performance at wide viewing angles. While reducing the size of the light-shielding color resist layer 05 and increasing the size of the light-filtering color resist 04 could achieve a wider light-emitting angle, it would also increase the amount of ambient light passing through the light-filtering color resist 04, resulting in more ambient light being reflected in the display panel and affecting the display effect.

[0081] In some embodiments, such as Figures 2-6As shown, the display panel also includes a color resist layer assembly 50, which is located on the side of the display layer assembly 20 facing away from the substrate 10. The color resist layer assembly 50 includes a light-shielding color resist layer 52 and a plurality of light-filtering color resists 54. The light-shielding color resist layer 52 has a plurality of first openings 56 (see...). Figure 4 Each of the plurality of first openings 56 is disposed in a one-to-one correspondence with at least a portion of the light-emitting elements 21, and a plurality of color filter resistors 54 are disposed in the plurality of first openings 56. For example, as Figure 2 As shown, in one embodiment, the light-shielding color resist layer 52 and the light-filtering color resist 54 are disposed in different layers. The light-filtering color resist 54 is located on the side of the second optical functional layer 44 opposite to the display layer group 20. The orthographic projection of the light-filtering color resist 54 on the substrate 10 covers the orthographic projection of the corresponding optical pattern portion 42 on the substrate 10, and overlaps with the orthographic projection of the light-shielding color resist layer 52 on the substrate 10. For example, as... Figures 3-6 As shown, in another embodiment, the light-shielding color resist layer 52 and the light-filtering color resist 54 are disposed in the same layer. The light-filtering color resist 54 is located between the corresponding optical pattern portion 42 and the second optical functional layer 44, and is disposed in the corresponding first opening 56.

[0082] It should be noted that the color filter 54 is a color filter that allows light of a specific wavelength range to pass through. In other words, the color filter 54 can be configured to allow light of a certain color to pass through, enabling sub-pixels to emit light of the corresponding color. In some embodiments, multiple color filters 54 may include a first color filter, a second color filter, and a third color filter. The first color filter allows light of the first color to pass through, the second color filter allows light of the second color to pass through, and the third color filter allows light of the third color to pass through. The first, second, and third colors can each be a primary color; for example, the first color can be red, the second color can be green, and the third color can be blue.

[0083] It should also be noted that the light-shielding color resist layer 52 is a color resist that can block light. Multiple color filters 54 and the light-shielding color resist layer 52 give the color resist layer group 50 multiple light-transmitting areas corresponding one-to-one with the light-emitting element 21 and opaque areas between adjacent light-transmitting areas. The opaque areas prevent the colors of each sub-pixel from interfering with each other, avoiding color mixing between sub-pixels, thereby improving the resolution and display effect of the display panel. In some embodiments, the light-shielding color resist layer 52 can be a black matrix. The material of the black matrix can absorb light, thus playing a light-shielding role. For example, the material of the black matrix can include resin and black pigment. The resin can be acrylic resin. Alternatively, the material of the black matrix can also include metals, such as chromium. In other embodiments, in the opaque areas, the first color filter color resist, the second color filter color resist, and the third color filter color resist can be stacked. That is, by stacking the three colors of the color filter color resist 54, an opaque area is formed, which can replace the black matrix, eliminating the need to additionally fabricate a black matrix. This allows the black matrix process to be omitted during the manufacturing of the display panel, thereby simplifying the manufacturing process and reducing the production cost of the display panel.

[0084] In some embodiments, the color filter 54 is located between the corresponding optical pattern section 42 and the second optical functional layer 44, and the refractive index of the first optical functional layer is greater than that of the color filter 54. It can be understood that when light (oblique light emitted by the light-emitting element 21) passes through the optical pattern section 42 with a higher refractive index and enters the color filter 54 with a lower refractive index, refraction occurs, causing the oblique light to transform into light that is more inclined towards the positive viewing angle. That is, the light converges towards the center of the light-emitting element 21, thereby achieving a converging effect of the displayed light, thus improving the brightness at the positive viewing angle. Reducing the power consumption of the display panel can achieve high brightness at the positive viewing angle. Meanwhile, ambient light enters from the surface of the display panel and undergoes a first refraction after passing through the second optical functional layer 44. After being deflected, it reaches the color filter 54 and the optical pattern section 42. When passing through the color filter 54 and the optical pattern section 42, it undergoes a second refraction and is deflected to reach the metal film layer (e.g., the source and drain layers of a thin-film transistor). After being reflected by the metal film layer, the reflected light reaches the position of the light-shielding color filter layer 52 and is absorbed by the light-shielding color filter layer 52. This can avoid the color accuracy of the display being affected by a large amount of reflection of ambient light in the display panel.

[0085] It is worth emphasizing that the light-shielding color resist layer 52 has the function of blocking and absorbing light, which can prevent crosstalk between the light emitted by each light-emitting element 21 and thus affect the display quality of the display panel. At the same time, due to the presence of the light-shielding color resist layer 52, the light extraction efficiency of each light-emitting element 21 will be affected to a certain extent. When the light emitted from the light-emitting element 21 reaches the location of the light-shielding color resist layer 52, it will be absorbed by the light-shielding color resist layer 52, which will affect the light output brightness of the display panel, especially the light output brightness at a wide viewing angle. In some embodiments, by setting the thickness of the edge portion B of the optical pattern portion to decrease from the middle portion A to the edge portion B, when the light emitted from the light-emitting element 21 reaches the location of the optical pattern portion 42, the optical pattern portion 42 can refract and converge the light emitted from the light-emitting element 21, thereby increasing the light extraction efficiency of the light-emitting element 21 to a certain extent. This can improve the light output brightness of the display panel at the front viewing angle (viewing angle of 0 or a small angle) and improve the visibility of the display panel at the side viewing angle (wider viewing angle).

[0086] In some embodiments, such as Figure 3 and Figure 6 As shown, the color filter 54 includes a main body 542 covering the optical pattern portion 42, and an extension 544 located between the main body 542 and the sidewall of the first opening 56. In this way, on the one hand, the light focusing ability can be improved, and on the other hand, the light emitted from the light-emitting element 21 can be passed through the color filter 54 to achieve the filtering effect.

[0087] As one implementation, the edge portion B of the optical pattern portion 42 corresponding to the color filter 54 is also formed with a slope, so that more light can be emitted at a more positive angle.

[0088] It should be noted that the difference between the refractive index of the first optical functional layer and the refractive index of the color filter 54 should not be too small, otherwise it will be difficult to achieve a good light-converging effect. Correspondingly, the difference between the refractive index of the first optical functional layer and the refractive index of the color filter 54 should also not be too large. If the difference in refractive index between the two is too large, on the one hand, total internal reflection will easily occur at the interface where the first optical functional layer and the color filter 54 come into contact, resulting in light loss. On the other hand, the light-converging effect after passing through the optical pattern section 42 and the color filter 54 will be too strong, which will easily cause excessive brightness attenuation at the side or oblique viewing angle. For example, a difference between the refractive index of the first optical functional layer and the refractive index of the color filter 54 greater than 0.1 can achieve a good light-converging effect. A difference between the refractive index of the first optical functional layer and the refractive index of the color filter 54 less than 0.8 can not only avoid excessive light loss due to total internal reflection, but also avoid excessive brightness attenuation at the side or oblique viewing angle. In a preferred embodiment, the difference between the refractive index of the first optical functional layer and the refractive index of the color filter 54 is greater than or equal to 0.2 and less than or equal to 0.5. For example, the difference between the refractive index of the first optical functional layer and the refractive index of the color filter 54 is, for example, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5. This results in a better light-gathering effect, reduces light loss caused by total internal reflection, and minimizes brightness attenuation at side and oblique viewing angles, enabling large-angle light emission and improving the display effect of the display panel at wide viewing angles.

[0089] For example, the refractive index n1 of the color filter 54 can be 1.0 to 2.0, for example, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0. The refractive index n2 of the first optical functional layer can be 1.1 to 2.0, for example, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0. The refractive index n3 of the second optical functional layer 44 can be 1.1 to 1.5, for example, 1.1, 1.2, 1.3, 1.4, or 1.5. As one possible implementation, the refractive index n1 of the color filter 54 ranges from 1.0 to 1.5, and the refractive index n2 of the first optical functional layer ranges from 1.3 to 1.8, for example, 1.3, 1.4, 1.5, 1.6, 1.7, or 1.8. This ensures good light transmittance while achieving better light focusing effect.

[0090] For example, the maximum thickness of the first optical functional layer is 2-6 micrometers, the maximum thickness of the second optical functional layer 44 is 1-4 micrometers, and the maximum thickness of the color filter 54 is 2-8 micrometers. It should be noted that, for example, as... Figure 1-4In the illustrated embodiment, the first optical pattern layer includes a plurality of optical pattern portions 42. Therefore, the maximum thickness of the first optical film layer refers to the thickness of the middle portion A of the optical pattern portion 42. The film thickness of the color filter 54 is the same at all positions; therefore, the maximum thickness of the color filter 54 refers to the film thickness at any given position. Since the top surface of the second optical functional layer 44 is planar, the maximum thickness of the second optical functional layer 44 is the distance from the top surface of the second optical functional layer 44 to the surface of the encapsulation layer 30 (see...). Figure 2 ) or the surface 54 cm from the color filter (see Figure 3 ( ) distance.

[0091] For example, such as Figure 5 and Figure 6 In the embodiment shown, the first optical pattern layer includes a plurality of optical pattern portions 42, and the maximum thickness of the first optical film layer refers to the thickness at the middle position of the optical pattern portion 42. Since the color filter 54 is not a film layer of uniform thickness, the maximum thickness of the color filter 54 refers to the maximum distance between its top surface and the surface of the encapsulation layer 30.

[0092] It is understandable that the refractive index of the first optical functional layer, the refractive index of the color filter 54, and the refractive index of the second optical functional layer 44 can be adaptively matched and adjusted according to design requirements, so as to reduce the reflectivity of the display panel to ambient light, improve light convergence, and reduce light attenuation at wide viewing angles.

[0093] In some embodiments, each first opening 56 is directly opposite the corresponding light-emitting element 21. The minimum distance between the edge of the orthographic projection of the light-emitting element 21 on the substrate 10 and the edge of the orthographic projection of the optical pattern portion 42 on the substrate 10 is a first distance L1, and the minimum distance between the edge of the orthographic projection of the light-emitting element 21 on the substrate 10 and the edge of the orthographic projection of the first opening 56 on the substrate 10 is a second distance L2. The first distance and the second distance satisfy the condition: L1 < L2. In this way, there can be a certain distance between the edge of the optical pattern portion 42 and the corresponding light-shielding color resist layer 52. The color resist 54 with a lower refractive index can completely cover the optical pattern portion 42 and fill the gap between the optical pattern portion 42 and the corresponding light-shielding color resist layer 52, thereby ensuring that the oblique light rays emitted from the edge of the light-emitting element 21 can pass through the optical pattern portion 42 and the color resist 54 in sequence, thereby improving the convergence of the light.

[0094] For example, the color filter 54 is disposed within the corresponding first opening 56, and the range of the first distance is: 1 micrometer ≤ L1 ≤ 5 micrometers; the range of the second distance is: 5 micrometers ≤ L2 ≤ 9 micrometers.

[0095] In some embodiments, the orthographic projection of the light-shielding color resist layer 52 on the substrate 10 can overlap with at least a portion (e.g., partially; or, for example, entirely) of the orthographic projection of the pixel driving circuit on the substrate 10. This reduces light reflection caused by external light irradiating the pixel driving circuit, improving the display effect of the display panel. Furthermore, the orthographic projection of the light-shielding color resist layer 52 on the substrate 10 can overlap with the orthographic projection of the transistor (e.g., thin-film transistor) in the pixel driving circuit on the substrate 10. This mitigates the leakage current problem in the transistor caused by external light irradiating the semiconductor layer (the semiconductor layer material includes, for example, silicon).

[0096] In some embodiments, the display panel further includes an encapsulation layer 30 located between the display layer group 20 and the color resist layer group 50, wherein the refractive index of the first optical functional layer is less than that of the encapsulation layer 30. It should be understood that the refractive index of the first optical functional layer is less than that of the encapsulation layer 30. On the one hand, this allows light passing through the encapsulation layer 30 to converge when it passes through the optical pattern section 42. On the other hand, when ambient light is incident on the display panel, it allows the ambient light to be reflected by the refraction of the optical pattern section 42 (which has a lower refractive index) and the encapsulation layer 30 before reaching the reflective film layer (e.g., the metal film layer in the display panel), thereby allowing most of the ambient light to be reflected to the light-shielding color resist layer 52.

[0097] Of course, in another embodiment, the refractive index of the first optical functional layer can also be equal to the refractive index of the encapsulation layer 30, so that light can propagate in a straight line from the encapsulation layer 30 and the first optical functional layer without refraction, which is not limited here.

[0098] For example, the encapsulation layer 30 can be a single inorganic layer or a superimposed film of inorganic and organic layers, wherein the inorganic layer is preferably Al2O3, TiO2, or SiN. x SiCN x SiO x One or more of the combined materials, the organic layer can be prepared by inkjet printing technology, and the material of the organic layer is preferably one or more of the combined materials of acrylic, hexamethyl dimethyl ether, polyacrylate, polycarbonate and polystyrene.

[0099] To better understand the beneficial effects of this application, the manufacturing methods of the flexible display panel in some specific embodiments will be described in detail below:

[0100] like Figure 10 As shown, a method for manufacturing a flexible display panel in one embodiment of this application includes the following steps:

[0101] Step S110: Provide a substrate 10;

[0102] In some embodiments, such as Figures 2-5 The substrate 10 may include a substrate 12 and a driving layer assembly formed on the substrate 12. The substrate 12 may include an elastic and ductile organic material such as polyimide (PI). Of course, the substrate 12 is not limited to polyimide and may also include various other elastic and ductile organic materials.

[0103] The driving layer assembly may include a buffer layer 14 and a thin-film transistor 11 formed on the substrate 12. The buffer layer 14 may include at least one organic material such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyacrylate, polyimide, etc., forming a layered structure in the form of a single layer or multiple layers stacked. Alternatively, it may be formed into a single layer or multiple layers stacked from at least one of silicon oxide, silicon nitride, aluminum oxide, aluminum nitride, titanium oxide, or titanium nitride, or may include an organic material layer, an inorganic material layer, or a composite layer of organic and inorganic material layers.

[0104] Thin-film transistor 11 is disposed above buffer layer 14 and can control the emission of each sub-pixel. As one implementation method, such as... Figure 10 As shown, the thin-film transistor 11 may include a semiconductor layer 112, a gate electrode 114, a source electrode 116, and a drain electrode 118. The semiconductor layer 112 may be formed of an amorphous silicon layer, a metal oxide layer, or a polycrystalline silicon layer, or it may be formed of an organic semiconductor material. The semiconductor layer 112 may be covered by a gate insulating layer 16, and the gate electrode 114 may be disposed on the gate insulating layer 16. Considering adhesion to adjacent layers, formability of stacked target layers, and surface flatness, the gate insulating layer 16 may be formed of silicon oxide, silicon nitride, or other insulating organic or inorganic materials. The gate electrode 114 may be covered by an interlayer insulating layer 18 formed of silicon oxide, silicon nitride, and / or other suitable insulating organic or inorganic materials. A portion of the gate insulating layer 16 and the interlayer insulating layer 18 may be removed, after which contact holes are formed to expose predetermined areas of the semiconductor layer 112. The source electrode 116 and the drain electrode 118 may contact the semiconductor layer 112 via the contact holes.

[0105] Step S120: A display layer group 20 and an optical functional layer group are formed on the substrate 10;

[0106] The display layer group 20 includes a plurality of light-emitting elements 21. The optical functional layer group is located on the side of the display layer group 20 away from the substrate 10. The optical functional layer group includes a first optical functional layer and a second optical functional layer 44 stacked on the side of the first optical functional layer away from the display layer group 20. The first optical functional layer includes a plurality of optical pattern portions 42, and the plurality of optical pattern portions 42 are disposed in a one-to-one correspondence with at least a portion of the light-emitting elements 21. The orthographic projection of the second optical functional layer 44 onto the substrate 10 covers the orthographic projection of the first optical functional layer onto the substrate 10. The refractive index of the first optical functional layer is greater than the refractive index of the second optical functional layer 44.

[0107] In some embodiments, due to the complex layer structure of the driving layer group, its top surface may be uneven. The display layer group 20 further includes a planarization layer 22 to form a sufficiently flat top surface. After forming the planarization layer 22, vias can be formed in the planarization layer 22 to expose the source electrode 116 or drain electrode 118 of the driving layer group. Pixel electrodes are formed on the planarization layer 22 and are contacted and connected to the source electrode 116 or drain electrode 118 of the driving layer group through the aforementioned vias.

[0108] In some embodiments, the pixel definition layer 26 is formed on the planarization layer 22 and exposes at least a portion of each pixel electrode. For example, the pixel definition layer 26 may cover at least a portion of the edge of each pixel electrode, thereby exposing at least a portion of each pixel electrode. Thus, the pixel definition layer 26 defines a plurality of pixel definition openings and non-opening areas located between the pixel definition openings, through which a portion or all of the middle portion of the pixel electrode is exposed, and the light-emitting element 21 is disposed within the pixel definition opening.

[0109] The common electrode 28, opposite to the pixel electrode, can cover the entire pixel definition layer 26. It can be made of metals with low power functions, such as silver, lithium, magnesium, calcium, strontium, aluminum, and indium, or a metal compound or alloy material. In some embodiments, the common electrode 28 can be deposited to cover the light-emitting element 21 within the pixel definition opening and the spacing between the pixel definition openings.

[0110] In some embodiments, the step of: prior to forming the color resist layer group 50, is further included.

[0111] An encapsulation layer 30 is formed on the display layer group 20;

[0112] In one embodiment, the encapsulation layer 30 includes a plurality of inorganic encapsulation film layers and at least one organic encapsulation film layer stacked together. The at least one organic encapsulation film layer is disposed between the plurality of inorganic encapsulation film layers, and the plurality of inorganic encapsulation films form a closed space that seals the organic encapsulation film layer. It should be understood that the inorganic encapsulation film layers can minimize or completely prevent the penetration of moisture, oxygen and / or hydrogen into the driving layer and the light-emitting element 21. Therefore, in one embodiment, the inorganic encapsulation film layers and the organic encapsulation film layers can be stacked alternately. The inorganic encapsulation film layers can be set as the uppermost and lowermost layers of the encapsulation unit, and the outermost inorganic encapsulation film layer can completely cover the organic encapsulation film layer, thereby forming a barrier space that can block the entry of water and oxygen.

[0113] Figure 12 A schematic diagram of the structure of a display device according to an embodiment of this application is shown.

[0114] Based on the flexible display panel described above, embodiments of this application also provide a display device, which includes the display panel described in any of the above embodiments.

[0115] like Figure 12 As shown, the display device can be a display terminal, such as a tablet computer. In other embodiments, the display device can also be a mobile communication terminal, such as a mobile phone terminal. In still other embodiments, the display device can also be a wearable device, a VR device, an in-vehicle device, etc.

[0116] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display panel, characterized in that, include: substrate; A display layer assembly is disposed on the substrate, and the display layer assembly includes a plurality of light-emitting elements; as well as An optical functional layer group is located on the side of the display layer group opposite to the substrate, and the optical functional layer group includes: The first optical functional layer includes a plurality of optical pattern portions, wherein the plurality of optical pattern portions are disposed in a one-to-one correspondence with at least a portion of the light-emitting elements; A second optical functional layer is stacked on the side of the first optical functional layer away from the display layer group, and the orthogonal projection of the second optical functional layer on the substrate covers the orthogonal projection of the first optical functional layer on the substrate. The refractive index of the first optical functional layer is greater than the refractive index of the second optical functional layer; The display panel further includes a color resist layer assembly, which is located on the side of the display layer assembly facing away from the substrate. The color resist layer assembly includes: A light-shielding color-blocking layer has multiple first openings, and the multiple first openings are arranged in a one-to-one correspondence with at least a portion of the light-emitting elements; Multiple color filters are disposed in the multiple first openings; The optical pattern portion includes a central portion and an edge portion surrounding the central portion, wherein the thickness of the edge portion decreases from the central portion toward the edge portion; The side of the color filter that faces away from the substrate includes a first sub-surface, which corresponds to the edge portion. The distance between the first sub-surface and the substrate along the thickness direction of the substrate decreases from the middle portion to the edge portion.

2. The display panel according to claim 1, characterized in that, The orthographic projection of the edge portion onto the substrate is offset from that of the light-emitting element.

3. The display panel according to claim 2, characterized in that, The thickness of the edge portion continuously decreases from the middle portion toward the edge portion to form a slope on the side of the edge portion away from the substrate.

4. The display panel according to claim 2, characterized in that, The thickness of the middle portion is uniform, and the surface of the edge portion facing away from the substrate is constructed as an outwardly convex arc-shaped slope.

5. The display panel according to claim 4, characterized in that, The slope angle γ of the slope surface satisfies the condition: 15 degrees ≤ γ ≤ 50 degrees.

6. The display panel according to claim 2, characterized in that, The optical pattern portion has an outwardly convex arc-shaped surface on the side of its surface facing away from the substrate.

7. The display panel according to claim 1, characterized in that, The orthographic projection of the optical pattern portion on the substrate covers the orthographic projection of the corresponding light-emitting element on the substrate.

8. The display panel according to claim 1, characterized in that, The display layer group includes a pixel definition layer, which defines a plurality of pixel opening areas and a non-opening area surrounding the pixel opening areas, and the light-emitting element is disposed in the pixel opening area; The orthographic projection of the optical pattern portion onto the substrate covers the orthographic projection of the corresponding pixel opening area onto the substrate, and overlaps with the orthographic projection of the non-opening area onto the substrate.

9. The display panel according to any one of claims 1-8, characterized in that, The second optical functional layer directly covers the surface of the first optical functional layer on the side facing away from the display layer group.

10. The display panel according to any one of claims 1-8, characterized in that, The color filter is located on the side of the second optical functional layer opposite to the display layer group; or The color filter is located between the corresponding optical pattern portion and the second optical functional layer, and the refractive index of the optical pattern portion is greater than the refractive index of the color filter.

11. The display panel according to claim 10, characterized in that, Each of the first openings is directly opposite the corresponding light-emitting element, and the minimum distance between the edge of the orthographic projection of the light-emitting element on the substrate and the edge of the orthographic projection of the corresponding optical pattern portion on the substrate is a first distance L1; The minimum distance between the edge of the orthographic projection of the light-emitting element on the substrate and the edge of the orthographic projection of the first opening on the substrate is the second distance L2; The first distance and the second distance satisfy the condition: L1 < L2.

12. The display panel according to claim 11, characterized in that, The first distance ranges from 1 micrometer to L1 to 5 micrometers; the second distance ranges from 5 micrometers to L2 to 9 micrometers.

13. The display panel according to any one of claims 1-8, characterized in that, The display panel further includes an encapsulation layer located between the display layer group and the optical functional layer group; The refractive index of the first optical functional layer is less than or equal to the refractive index of the encapsulation layer.

14. A method for manufacturing a display panel, characterized in that, include; Provide a substrate; A display layer group and an optical functional layer group are sequentially formed on the substrate. The display layer group includes a plurality of light-emitting elements. The optical functional layer group is located on the side of the display layer group away from the substrate. The optical functional layer group includes a first optical functional layer and a second optical functional layer stacked on the side of the first optical functional layer away from the display layer group. The first optical functional layer includes a plurality of optical pattern portions, and the plurality of optical pattern portions are disposed in a one-to-one correspondence with at least a portion of the light-emitting elements. The orthographic projection of the second optical functional layer on the substrate covers the orthographic projection of the first optical functional layer on the substrate. The refractive index of the first optical functional layer is greater than the refractive index of the second optical functional layer. The display panel further includes a color resist layer assembly, which is located on the side of the display layer assembly facing away from the substrate. The color resist layer assembly includes: A light-shielding color-blocking layer has multiple first openings, and the multiple first openings are arranged in a one-to-one correspondence with at least a portion of the light-emitting elements; Multiple color filters are disposed in the multiple first openings; The optical pattern portion includes a central portion and an edge portion surrounding the central portion, wherein the thickness of the edge portion decreases from the central portion toward the edge portion; The side of the color filter that faces away from the substrate includes a first sub-surface, which corresponds to the edge portion. The distance between the first sub-surface and the substrate along the thickness direction of the substrate decreases from the middle portion to the edge portion.

15. A display device, characterized in that, Includes the display panel as described in any one of claims 1-13.

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