Cover plate and preparation method thereof, display panel and display device

Abstract

The present application relates to a kind of cover plate and its preparation method, display panel and display device, it is related to display technical field, the first hardening coating in the cover plate includes body part and micro-nano structure array, micro-nano structure array includes multiple array arranged micro-nano structure, the height value of micro-nano structure in first direction, the maximum value of width in second direction and the first spacing between the highest point of the side of adjacent two micro-nano structures away from substrate are less than the minimum value of pre-set wavelength, and pre-set wavelength includes at least part wave band of visible light wavelength, so that at least part visible light wavelength can be identified. Micro-nano structure array makes the refractive index of light present progressive continuity change, to avoid the reflection phenomenon caused by refractive index sharp change, realizes the low reflectivity of cover plate surface. Display panel and display device use the cover plate also increase service life.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a cover plate and its preparation method, a display panel, and a display device. Background Technology

[0002] With the development of display technology, the surface coating of the cover plate of display products needs to have low reflectivity to ensure the display effect of electronic products used outdoors.

[0003] Existing cover plates achieve low reflectivity by applying an anti-reflective coating (AR) to their hard coating surface; however, the design of the anti-reflective coating significantly reduces the scratch resistance of the cover plate surface. Summary of the Invention

[0004] Therefore, it is necessary to provide a cover plate and its preparation method, a display panel, and a display device to address the above problems.

[0005] To achieve the above objectives, in one aspect, the present invention provides a cover plate, comprising:

[0006] substrate;

[0007] A first hardened coating is located on one side of the substrate; the first hardened coating includes a body portion and a micro / nano structure array, the body portion is located on the substrate, and the micro / nano structure array protrudes from the body portion in a direction away from the substrate;

[0008] The micro / nano structure array comprises multiple arrayed micro / nano structures; in a first direction, the height of each micro / nano structure is less than the minimum value of a preset wavelength, and the first direction is perpendicular to the substrate; in a second direction, the maximum width of each micro / nano structure is less than the minimum value of the preset wavelength, and the second direction is parallel to the substrate; and in the second direction, the distance between the highest points of two adjacent micro / nano structures on the side away from the substrate is a first distance, which is less than the minimum value of the preset wavelength; the preset wavelength includes at least a portion of the visible light wavelength band.

[0009] In one embodiment, the shape of the orthographic projection of the micro / nanostructure onto the substrate includes a polygon;

[0010] Optionally, the polygon has a side length greater than or equal to 6;

[0011] Optionally, the polygon is a regular hexagon.

[0012] In one embodiment, the height of the body portion in the first direction ranges from 3μm to 30μm.

[0013] In one embodiment, the material of the first hardened coating includes a high-hardness resin material with a functionality greater than or equal to 9.

[0014] Optionally, the high-hardness resin material accounts for 20%-50% of the composition of the first hardened coating material.

[0015] In one embodiment, the material of the first hardened coating further includes inorganic nanoparticles;

[0016] Optionally, the inorganic nanoparticles include alumina particles or silicon oxide particles;

[0017] Optionally, the inorganic nanoparticles account for 5%-20% of the composition of the material in the first hardened coating;

[0018] Alternatively, the material of the first hardened coating may also include a fluorinated hydrophobic agent;

[0019] Optionally, the proportion of the fluoride hydrophobic agent in the material of the first hardened coating ranges from 5% to 20%.

[0020] Alternatively, the material of the first hardened coating may also include inorganic nanoparticles and fluoride hydrophobic agents;

[0021] Optionally, the inorganic nanoparticles account for 4%-27% of the composition of the first hardened coating material, and the fluorinated hydrophobic agent accounts for 1%-3% of the composition of the first hardened coating material.

[0022] In one embodiment, the substrate includes a central region and an edge region, the edge region surrounding the central region;

[0023] The cover plate further includes: a light-shielding frame located on the side of the substrate away from the first hardened coating, covering the edge area;

[0024] Optionally, the material of the light-shielding frame includes a mixture of carbon black particles and optical adhesive material, wherein the carbon black particles account for less than 5% of the composition of the light-shielding frame material.

[0025] In one embodiment, the preset wavelength includes the entire band of the visible light wavelength.

[0026] On the other hand, this application also provides a method for preparing a cover plate, comprising:

[0027] Provide substrate;

[0028] A first material layer is formed on one side of the substrate;

[0029] The first material layer is imprinted using a first mold to form a micro-nano structure array;

[0030] The first material layer having the micro-nano structure array is cured to form a first hardened coating.

[0031] On the other hand, this application also provides a display panel, the display panel comprising:

[0032] Substrate;

[0033] A light-emitting functional layer is located on the substrate;

[0034] An encapsulation layer that covers the light-emitting functional layer;

[0035] The cover plate described above is connected to the encapsulation layer via a light-shielding frame.

[0036] On the other hand, this application also provides a display device, including the aforementioned display panel.

[0037] Compared with existing technologies, the above technical solution has the following advantages:

[0038] In the cover plate, display panel, and display device, the cover plate includes a substrate and a first hardened coating. The first hardened coating is disposed on one side of the substrate and includes a body portion and a micro / nanostructure array. The body portion is located on the substrate, and the micro / nanostructure array protrudes from the body portion in a direction away from the substrate. The micro / nanostructure array includes multiple arrayed micro / nanostructures. In a first direction, the height of each micro / nanostructure is less than a minimum value of a preset wavelength, and the first direction is perpendicular to the substrate. In a second direction, the maximum width of each micro / nanostructure is less than a minimum value of a preset wavelength, and the second direction is parallel to the substrate. In the second direction, the first distance between the highest points of two adjacent micro / nanostructures on the side away from the substrate is less than a minimum value of a preset wavelength.

[0039] Since the preset wavelength includes at least a portion of the visible light wavelength band, and the maximum values ​​of the height of the micro / nanostructure in the first direction, the width in the second direction, and the first spacing between two adjacent micro / nanostructures are all less than the minimum value of the preset wavelength, at least a portion of the visible light wavelength band cannot be identified. The micro / nanostructure array causes a gradual and continuous change in the refractive index of light, thereby avoiding reflection caused by drastic changes in refractive index and achieving low reflectivity on the cover surface. Compared to existing methods of preparing anti-reflective coatings on a first hardened coating, the first hardened coating of this application achieves both low reflectivity and good wear resistance.

[0040] Furthermore, the thickness of the display panel based on this cover plate is reduced, while the visual effect of the display is also better. The visual effect of the display device is also improved. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This application provides a schematic diagram of the cross-sectional structure of a cover plate according to an embodiment;

[0043] Figure 2 This is an enlarged top view of a cover plate structure provided in an embodiment of this application;

[0044] Figure 3 This is an enlarged cross-sectional schematic diagram of a first hardened coating provided in an embodiment of this application;

[0045] Figure 4 This is a top view of a first hardened coating provided in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the cross-sectional structure of another cover plate provided in an embodiment of this application;

[0047] Figure 6 A top view of another cover plate provided in an embodiment of this application;

[0048] Figure 7 A schematic diagram illustrating the fabrication process of the cover plate provided in this application embodiment;

[0049] Figure 8 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application.

[0050] Explanation of reference numerals in the attached figures: 01-substrate; 011-central area; 012-edge area; 03-first hardened coating; 031-body; 032-micro / nano structure array; 033-micro / nano structure; 04-substrate; 05-light-emitting functional layer; 06-encapsulation layer; 07-filling material layer. Detailed Implementation

[0051] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be more thorough and complete.

[0052] 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 this application.

[0053] It should be understood that when a layer is referred to as "on," "adjacent to," or "connected to" other layers, it can be directly on, adjacent to, or connected to other layers, or there can be intervening layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," or "directly connected to" other layers, there are no intervening layers.

[0054] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0055] Based on the background information, the cover plate includes a substrate and a hard coating and an anti-reflective coating sequentially stacked on the substrate. The hard coating is mainly used to increase the hardness and scratch resistance of the cover plate, while the anti-reflective coating is used to reduce the reflectivity of the cover plate. The anti-reflective coating is generally composed of a high-refractive-index coating and a low-refractive-index coating, and common processes include magnetron sputtering or wet coating. This type of anti-reflective coating has poor abrasion resistance; its steel wool abrasion resistance is less than 300 cycles, making it prone to scratches and reducing visual appeal. Furthermore, the addition of the anti-reflective coating also increases the thickness of the cover plate.

[0056] Based on this, this application provides a cover plate, a display panel, and a display device. The cover plate includes a substrate and a first hardened coating. The first hardened coating is disposed on one side of the substrate and includes a body portion and a micro / nano structure array. The body portion is located on the substrate, and the micro / nano structure array protrudes from the body portion in a direction away from the substrate. The micro / nano structure array includes multiple arrayed micro / nano structures. In a first direction, the height of each micro / nano structure is less than a minimum value of a preset wavelength, and the first direction is perpendicular to the substrate. In a second direction, the maximum width of each micro / nano structure is less than a minimum value of a preset wavelength, and the second direction is parallel to the substrate. In the second direction, the first distance between the highest points of two adjacent micro / nano structures on the side away from the substrate is less than a minimum value of a preset wavelength.

[0057] Since the preset wavelength includes at least a portion of the visible light wavelength band, and the maximum height of the micro / nanostructure in the first direction, the maximum width in the second direction, and the first spacing between the highest points of two adjacent micro / nanostructures on the side furthest from the substrate are all less than the minimum value of the preset wavelength, at least a portion of the visible light wavelength cannot be identified. The micro / nanostructure array causes a gradual and continuous change in the refractive index of light, thereby avoiding reflection caused by drastic changes in refractive index and achieving low reflectivity on the cover surface. Compared to existing methods of preparing anti-reflective coatings on a first hardened coating, the first hardened coating of this application achieves both low reflectivity and good wear resistance.

[0058] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] refer to Figure 1 , Figure 1 This application provides a schematic cross-sectional view of a cover plate according to an embodiment; see reference. Figure 2 , Figure 2 This application provides an enlarged top view of a cover plate structure according to an embodiment of the present application; the cover plate includes:

[0060] substrate01;

[0061] The first hardened coating 03 is located on one side of the substrate 01. The first hardened coating 03 includes a body portion 031 and a micro-nano structure array 032. The body portion 031 is located on the substrate 01, and the micro-nano structure array 032 protrudes from the body portion 031 in a direction away from the substrate 01.

[0062] The micro / nano structure array 032 includes multiple arrayed micro / nano structures 033; in the first direction Y, the height of each micro / nano structure 033 is less than the minimum value of a preset wavelength, and the first direction Y is perpendicular to the substrate 01; in the second direction X, the maximum value of the width Z of each micro / nano structure 033 is less than the minimum value of a preset wavelength, and the second direction X is parallel to the substrate; and in the second direction X, the distance between the highest points of two adjacent micro / nano structures 033 on the side away from the substrate 01 is a first distance L, and the first distance L is less than the minimum value of a preset wavelength; the preset wavelength includes at least a portion of the visible light wavelength band.

[0063] Specifically, substrate 01 may include, but is not limited to, a polyimide (CPI) substrate, a polyethylene terephthalate (PET) substrate, or a cellulose triacetate (TAC) substrate. It should be noted that this cover plate can serve as a cover plate for various different display panels, and no specific limitations are made here.

[0064] A first hardening coating 03 is provided on one side of the substrate 01, which increases the hardness of the cover plate. The first hardening coating 03 includes a body portion 031 and a micro / nano structure array 032. It should be noted that in this embodiment, the body portion 031 and the micro / nano structure array 032 are formed integrally; describing them separately is only for better structural description.

[0065] The main body 031 is located on the substrate 01, that is, in contact with the substrate 01. The micro-nano structure array 032 protrudes from the main body 031 in a direction away from the substrate 01. The protrusion can be an arc-shaped protrusion or a conical protrusion, and there is no specific limitation.

[0066] refer to Figure 3 , Figure 3 This is an enlarged cross-sectional schematic diagram of a first hardened coating provided in an embodiment of this application; see reference. Figure 4 , Figure 4 This is a top view of a first hardened coating provided in an embodiment of this application; it should be noted that, Figure 1 for Figure 4 A cross-sectional view along section AA'. Figure 2 for Figure 4 A magnified structural diagram is shown. The micro / nano structure array 032 includes multiple arrayed micro / nano structures 033, that is, the micro / nano structures 033 are arranged sequentially in the row direction and in the column direction.

[0067] In the first direction Y, the height of each micro / nano structure 033 is H, and the height value is less than the minimum value of the preset wavelength; for example, the minimum value of the preset wavelength is 420 nanometers, and the height H of the micro / nano structure 033 is less than 420 nanometers.

[0068] In the second direction X, the width of each micro / nanostructure 033 is Z, and the maximum value of the width Z is less than the minimum value of the preset wavelength; for example, if the minimum preset wavelength is 400 nanometers, the maximum width Z of the micro / nanostructure 033 is less than 400 nanometers. It should be noted that the shape of the micro / nanostructure 033 on the horizontal plane is not specifically limited, therefore its width Z in the horizontal direction can be unequal. For example, when the cross-section of the micro / nanostructure 033 on the horizontal plane is polygonal, the width Z on the diagonal is the maximum value. Therefore, the maximum value of the width Z of the micro / nanostructure 033 in the second direction X needs to be set less than the minimum value of the preset wavelength. Furthermore, in the convex direction, the cross-sectional area of ​​the micro / nanostructure 033 can decrease sequentially. To prevent the micro / nanostructure 033 from recognizing light of the preset wavelength, the width Z of the micro / nanostructure 033 with the largest cross-sectional area in the horizontal direction is the maximum value of the width Z of the micro / nanostructure 033.

[0069] In the second direction X, the distance between the highest points of two adjacent micro / nano structures 033 on the side away from the substrate 01 is the first distance L. The first distance L is less than the minimum value of a preset wavelength. For example, if the minimum value of the preset wavelength is 400 nanometers, the distance between the highest points of two adjacent micro / nano structures 033 on the side away from the substrate 01 is less than 400 nanometers, that is, the first distance L is less than 400 nanometers. It should be noted that this is only an example and does not constitute a specific limitation.

[0070] It should be noted that the preset wavelength includes at least a portion of the visible light wavelength band. The visible light wavelength range is from 380 nanometers to 780 nanometers. Different wavelength bands correspond to different colors. The preset wavelength band can be selected according to specific color requirements, thereby adjusting the height H of the micro / nano structure 033, the maximum value of its width Z in the second direction X, and the first spacing L between the highest points of two adjacent micro / nano structures 033 on the side furthest from the substrate 01. This allows for a wider range of applications for the cover plate.

[0071] For example, in a specific external environment where the ambient light is predominantly red (with a wavelength between 620 nm and 780 nm), when setting up the micro / nano structure 033, the height of the micro / nano structure 033, the maximum value of its width Z in the second direction X, and the first distance L between the highest points of two adjacent micro / nano structures 033 on the side furthest from the substrate 01 all need to be less than 620 nm. In this case, since the size of the micro / nano structure 033 is smaller than the minimum value for the red light wavelength, it cannot recognize the red light wavelength, thus avoiding reflection caused by drastic changes in refractive index. Similarly, when the ambient light is predominantly yellow, blue, green, or violet, the height of the micro / nano structure 033, the maximum value of its width Z in the second direction X, and the first distance L between the highest points of two adjacent micro / nano structures 033 on the side furthest from the substrate 01 all need to be less than the minimum value for the corresponding light wavelength.

[0072] In this embodiment, because the height of the micro / nano structure 033, the maximum value of its width Z in the second direction X, and the first distance L between the highest points of two adjacent micro / nano structures 033 on the side away from the substrate 01 are all less than the minimum value of a preset wavelength, at least some visible light wavelengths cannot be identified. The micro / nano structure array 032 makes the refractive index of light exhibit a gradual and continuous change, thereby avoiding reflection caused by drastic changes in refractive index and achieving low reflectivity on the cover surface. Compared with the existing method of preparing an anti-reflective coating on a first hardened coating 03, the first hardened coating 03 of this application achieves both low reflectivity and good wear resistance. Furthermore, the thickness of the cover can be further reduced without an anti-reflective coating, resulting in a thinner and lighter display panel using the cover.

[0073] In another embodiment of this application, such as Figure 3 As shown, the height h of the main body 031 in the first direction Y ranges from 3μm to 30μm.

[0074] Specifically, the body part 031 serves as the main support for the first hardened coating 03, ensuring the hardness of the first hardened coating 03. The height h of the body part 031 in the first direction Y ranges from 3μm to 30μm, including the endpoint values. For example, the height h of the body part 031 in the first direction Y can be 3μm, or the height h of the body part 031 in the first direction Y can be 12μm, or the height h of the body part 031 in the first direction Y can be 20μm, or the height h of the body part 031 in the first direction Y can be 26μm, etc. There are no specific limitations; these are just examples.

[0075] In another embodiment of this application, such as Figure 2 or Figure 4 As shown, the shape of the orthographic projection of the micro / nano structure 033 onto the substrate 01 includes polygons;

[0076] Optionally, the polygon has a side length greater than or equal to 6;

[0077] Optionally, the polygon is a regular hexagon.

[0078] Specifically, the shape of the orthographic projection of the micro / nano structure 033 onto the substrate 01 is a polygon, such as a triangle, pentagon, hexagon, octagon, etc., without specific limitations, and can be set according to specific needs.

[0079] In one embodiment, the polygon has a side length greater than or equal to 6 sides, for example, 6 sides, 7 sides, 8 sides, etc., without specific limitation. Setting the side length to be greater than or equal to 6 sides allows for a more refined structure of the micro / nano structure 033, which can further improve light scattering and diffraction effects. Furthermore, micro / nano structures 033 with more side lengths can form more complex three-dimensional networks or support structures, thereby improving the mechanical properties of the first hardened coating 03. In addition, the complex multi-sided micro / nano structure 033 can better disperse stress under load, reducing stress concentration, thereby improving wear resistance and extending the service life of the first hardened coating 03.

[0080] In one embodiment, the polygon can be a regular hexagon (e.g., Figure 4As shown, regular hexagons can be closely arranged on a plane without gaps, making full use of space. Furthermore, regular hexagons possess high symmetry, which makes the scattering and diffraction characteristics of the micro / nano structure 033 similar in different directions, further improving optical performance. In addition, regular hexagonal structures are relatively easy to fabricate in micro / nano fabrication technology. Their regular shape and symmetry make pattern design and alignment during processing easier, improving processing efficiency and precision while reducing manufacturing costs.

[0081] In this embodiment of the application, the orthographic projection of the micro-nano structure 033 on the substrate 01 is set as a polygon, which can make the structure of the micro-nano structure 033 more refined, further improve the light scattering and diffraction effect, and better disperse stress when subjected to force, reduce stress concentration, thereby improving wear resistance and extending the service life of the first hardened coating 03.

[0082] In another embodiment of this application, the material of the first hardened coating 03 includes a high-hardness resin material with a functionality greater than or equal to 9;

[0083] Optionally, the high-hardness resin material accounts for 20%-50% of the composition of the first hardened coating 03.

[0084] Specifically, the material of the first hardened coating 03 can be a high-hardness resin material with a functionality greater than or equal to 9, such as epoxy resin. Epoxy resin has high hardness, high strength and good wear resistance, and has a small shrinkage rate and good dimensional stability after curing, which improves the reliability of the cover plate.

[0085] It should be noted that the surface of the first hardened coating 03, made of a high-hardness resin with a functionality greater than or equal to 9, has a wear resistance of >5000 times. As the surface of the cover plate, the first hardened coating 03 has stronger wear resistance while reducing the need for an anti-reflective coating and thus reducing the thickness of the cover plate.

[0086] It should be noted that the proportion of high-hardness resin material in the first hardened coating 03 ranges from 20% to 50%, including the extreme values. For example, the proportion of high-hardness resin material in the first hardened coating 03 may be 20%, 26%, 33%, or 42%, etc. There are no specific limitations; these are just examples.

[0087] In this embodiment, setting the material of the first hardened coating 03 to a high-hardness resin material with a functionality greater than or equal to 9 can further improve the wear resistance of the first hardened coating 03.

[0088] In another embodiment of this application, the material of the first hardened coating 03 further includes inorganic nanoparticles;

[0089] Optionally, the inorganic nanoparticles include alumina particles or silicon oxide particles;

[0090] Optionally, the inorganic nanoparticles account for 5%-20% of the composition of the material in the first hardened coating 03;

[0091] Alternatively, the material of the first hardened coating 03 may also include a fluorinated hydrophobic agent;

[0092] Optionally, the proportion of the fluoride hydrophobic agent in the material of the first hardened coating 03 ranges from 5% to 20%;

[0093] Alternatively, the material of the first hardened coating 03 may also include inorganic nanoparticles and fluoride hydrophobic agents;

[0094] Optionally, the inorganic nanoparticles account for 4%-27% of the composition of the first hardened coating 03, and the fluorinated hydrophobic agent accounts for 1%-3% of the composition of the first hardened coating 03.

[0095] Specifically, the material of the first hardened coating 03 can also be based on a high-hardness resin material with a functionality greater than or equal to 9, with the addition of inorganic nanoparticles. The inorganic nanoparticles can be alumina particles or silicon oxide particles. Since alumina particles or silicon oxide particles have high hardness, they can further increase the wear resistance of the first hardened coating 03.

[0096] The proportion of inorganic nanoparticles in the material of the first hardened coating 03 ranges from 5% to 20%, including endpoint values. For example, the proportion of inorganic nanoparticles in the material of the first hardened coating 03 is 6%, or 10%, or 12%, or 18%, etc. There are no specific limitations; these are just examples.

[0097] In one embodiment, the material of the first hardened coating 03 can also be based on a high-hardness resin material with a functionality greater than or equal to 9, with the addition of a fluorinated hydrophobic agent. The addition of the fluorinated hydrophobic agent can not only further increase the wear resistance of the first hardened coating 03, but also increase the hydrophobicity of the surface of the first hardened coating 03.

[0098] The proportion of the fluorinated hydrophobic agent in the material of the first hardened coating 03 ranges from 5% to 20%, including the endpoint values. For example, the proportion of the fluorinated hydrophobic agent in the material of the first hardened coating 03 is 5%, or 10%, or 15%, or 18%, etc. There are no specific limitations; these are just examples.

[0099] In one embodiment, the material of the first hardened coating 03 can also be based on a high-hardness resin material with a functionality greater than or equal to 9, with the addition of both inorganic nanoparticles and fluorinated hydrophobic agents.

[0100] The inorganic nanoparticles constitute 4%-27% of the first hardened coating 03, and the fluorinated hydrophobic agent constitutes 1%-3% of the material in the first hardened coating 03, including the endpoint values. For example, when the inorganic nanoparticles constitute 4% of the material in the first hardened coating 03, the fluorinated hydrophobic agent constitutes 1%; or when the inorganic nanoparticles constitute 12% of the material in the first hardened coating 03, the fluorinated hydrophobic agent constitutes 2%; or when the inorganic nanoparticles constitute 20% of the material in the first hardened coating 03, the fluorinated hydrophobic agent constitutes 1%, etc. These are not specific limitations but are merely illustrative examples.

[0101] It should be noted that inorganic nanoparticles may also include titanium dioxide particles, etc., and are not specifically limited; this is only an example. Adding these inorganic nanoparticles to the first hardened coating 03 can enhance its hardness, scratch resistance, and corrosion resistance.

[0102] It should also be noted that fluorinated hydrophobic agents can include perfluoroalkyl compounds, fluorosilane compounds, etc., and are not specifically limited to these; this is merely an example. Because the molecular structure of fluorinated hydrophobic agents contains fluorine atoms, which have extremely high electronegativity and a small atomic radius, the fluorine-carbon bond has strong bond energy and low surface energy. When a fluorinated hydrophobic agent acts on the surface of an object, it forms a tightly packed molecular film with the fluorine atoms facing outwards, resulting in extremely low surface energy and thus achieving a hydrophobic effect. Adding this fluorinated hydrophobic agent to the first hardened coating 03 makes it easier to clean and further improves its wear resistance.

[0103] It should also be noted that the first hardened coating 03 also includes a crosslinking agent, a photoinitiator, a solvent, and other mixed solvents, which are used to form the first hardened coating 03.

[0104] In this embodiment, the addition of inorganic nanoparticles and / or fluoride hydrophobic agents to the material of the first hardened coating 03 not only further improves the hardness and wear resistance, but also improves the hydrophobic properties.

[0105] In another embodiment of this application, reference is made to Figure 5 , Figure 5 A schematic cross-sectional view of another cover plate provided in an embodiment of this application; see reference. Figure 6 , Figure 6 A top view of another cover plate provided in an embodiment of this application; the substrate 01 includes a central region 011 and an edge region 012, with the edge region 012 surrounding the central region 011;

[0106] The cover plate also includes: a light-shielding frame 02, located on the side of the substrate 01 away from the first hardened coating 03, covering the edge area 012;

[0107] Optionally, the material of the light-shielding frame 02 includes a mixture of carbon black particles and optical adhesive material, wherein the carbon black particles account for less than 5% of the composition of the material of the light-shielding frame 02.

[0108] Specifically, the substrate 01 includes a central region 011 and an edge region 012. The central region 011 is light-transmitting and provides the display area for the display panel. The edge region 012 surrounds the central region 011. A light-shielding frame 02 is provided on the side of the substrate 01 away from the first hardened coating 03. The light-shielding frame 02 covers the edge region 012 of the substrate 01 to prevent light leakage from the display panel.

[0109] The material of the light-shielding frame 02 can be, but is not limited to, a mixture of carbon black particles and optical adhesive. The optical adhesive can be optically clear adhesive (OCA), and there is no specific limitation. Mixing the optical adhesive with carbon black particles yields a black optical adhesive, achieving the light-shielding effect.

[0110] It should be noted that OCA adhesive has excellent adhesion to various optical materials such as glass and plastic, forming a strong bond between optical components of different materials, ensuring that delamination will not occur during long-term use. Existing light-shielding frames 02 use ink-based frames, but the ink is prone to adhesion failure with the printed surface. Compared to existing ink-based frames, the mixture of carbon black particles and optical adhesive material in this embodiment exhibits better adhesion.

[0111] In one embodiment, the proportion of carbon black particles in the material of the light-shielding frame 02 is less than 5%, including endpoint values. For example, the proportion of carbon black particles in the material of the light-shielding frame 02 is 1%, or the proportion of carbon black particles in the material of the light-shielding frame 02 is 3.5%, or the proportion of carbon black particles in the material of the light-shielding frame 02 is 5%, etc., without specific limitations, and is only for illustrative purposes.

[0112] In this embodiment, the material of the light-shielding frame 02 is a mixture of carbon black particles and optical adhesive material, which further improves the adhesion between the cover plate and the display panel.

[0113] In another embodiment of this application, the preset wavelength includes the entire band of visible light wavelengths.

[0114] Specifically, the preset wavelength can be the entire visible light wavelength band, that is, the preset wavelength band is from 380 nanometers to 780 nanometers. At this time, the height value of the micro-nano structure 033 on the cover plate surface, the maximum value of the width Z in the second direction Y, and the first distance L between the highest points of two adjacent micro-nano structures 033 on the side away from the substrate 01 are all less than the minimum value of 380 nanometers. The micro-nano structure 033 cannot recognize the entire visible light band, and at this time, there is no limitation on the external ambient light.

[0115] It should be noted that each micro / nano structure 033 is protruding. At this time, the cross-sectional area of ​​the micro / nano structure 033 along the first direction Y will gradually decrease with the direction of protrusion. In the second direction X, the maximum value of the width Z of the micro / nano structure 033 is the maximum value of the width Z of the micro / nano structure 033 near the bottom of the body part 031. The maximum value of the width Z of each micro / nano structure 033 is less than the minimum value of 380 nanometers. That is to say, the maximum value of the width Z of the micro / nano structure 033 near the bottom of the body part 031 is less than 380 nanometers. Along the direction of protrusion, the width of the cross-section of the micro / nano structure 033 can gradually decrease.

[0116] At this point, in the second direction X, the first spacing L between the highest points of two adjacent micro / nano structures 033 on the side away from the substrate 01 is also less than the minimum value of 380 nanometers, meaning that there is no spacing between the bottoms of the micro / nano structures 033 near the body portion 031. Continuous micro / nano structures 033 can further improve the light scattering and diffraction effects.

[0117] It should be noted that when the preset wavelength includes the entire visible light wavelength band, the height of each micro / nano structure 033 in the first direction Y can be 87 nm, 150 nm, 200 nm, 270 nm, 300 nm, 340 nm, 375 nm, etc. When the preset wavelength includes the entire visible light wavelength band, the maximum width of each micro / nano structure 033 in the second direction X can be 90 nm, 130 nm, 210 nm, 280 nm, 300 nm, 340 nm, 355 nm, etc. When the preset wavelength includes the entire visible light wavelength band, the distance between the highest points of two adjacent micro / nano structures 033 on the side away from the substrate 01, i.e., the first distance L, can be 90 nm, 130 nm, 210 nm, 280 nm, 300 nm, 340 nm, 355 nm, etc. The height value of the micro / nano structure 033, the maximum value of the width Z in the second direction X, and the first spacing L between the highest points of two adjacent micro / nano structures 033 on the side away from the substrate 01 are not specifically limited and can be set as needed.

[0118] In this embodiment, the preset wavelength setting covers the entire spectrum of visible light, which enables the cover to achieve low reflectivity under outdoor light, thus broadening the application range of the cover.

[0119] Based on the cover plate described above, refer to Figure 7 , Figure 7 This is a schematic diagram of the fabrication process of the cover plate provided in the embodiments of this application; this application also provides a method for fabricating the cover plate, including:

[0120] S10: Provide substrate 01;

[0121] S20: A first material layer is formed on one side of the substrate 01;

[0122] S30: The first material layer is imprinted using the first mold to form a micro-nano structure array 032;

[0123] S40: The first material layer with micro-nano structure array 032 is cured to form a first hardened coating 03.

[0124] Specifically, in this embodiment, the micro / nano structure array 032 is formed using a nanoimprint lithography process, which requires the initial fabrication of a first mold. The height of the micro / nano structure 033, the maximum width Z in the second direction X, and the first spacing L between the highest points of two adjacent micro / nano structures 033 on the side furthest from the substrate 01 are set according to specific needs. Then, based on these values, a first mold with a specific pattern of micro / nano structures 033 is fabricated. Typically, high-precision original patterns are created on silicon wafers or other hard materials using techniques such as electron beam lithography or focused ion beam etching. Then, a replication layer of hard material such as nickel is formed on the original pattern through processes such as electroplating to improve the hardness and wear resistance of the first mold, facilitating subsequent imprinting operations.

[0125] The provided substrate 01 may include, but is not limited to, a polyimide (CPI) substrate, a polyethylene terephthalate (PET) substrate, or a cellulose triacetate (TAC) substrate.

[0126] First, the surface of substrate 01 is cleaned to remove dust, oil, and other impurities. This is typically done using organic solvents such as acetone or ethanol for ultrasonic cleaning, followed by rinsing with deionized water and drying.

[0127] Subsequently, a first material layer is formed on one side of the substrate 01, including coating the substrate 01 with the first material layer. The coating method can employ techniques such as spin coating, spray coating, or blade coating. A suitable coating method is selected based on the properties of the first material layer and specific process requirements to control the thickness and uniformity of the first material layer. For example, during spin coating, the thickness of the first material layer is precisely controlled by adjusting the rotation speed and time. It should be noted that the material of the first material layer is the same as the material of the first hardened coating 03. Before curing, the first material layer has fluidity to facilitate filling the gaps within the micro / nano structure of the first mold during the imprinting process.

[0128] Next, the prepared first mold is aligned and tightly bonded to the side of the substrate 01 coated with the first material layer for imprinting, allowing the material of the first material layer to flow into the gaps of the micro-nano structure of the first mold, forming a micro-nano structure array 032. After imprinting is completed, the first mold is separated from the first material layer to obtain the first material layer with the micro-nano structure array 032.

[0129] Subsequently, the first material layer with the micro-nano structure array 032 is subjected to a first curing process to obtain a first hardened coating 03 with the micro-nano structure array 032 (e.g., Figure 1 (As shown).

[0130] In this embodiment, nanoimprint lithography can achieve high-precision structural patterns and reduce the generation of defects. Furthermore, the mold preparation cost of nanoimprint lithography is relatively low, and the molds can be reused multiple times, effectively reducing costs in large-scale production and making it suitable for industrial production.

[0131] In another embodiment of this application, the micro / nano structure array 032 can also be formed using photolithography.

[0132] Specifically, to form the micro / nano structure array 032 using photolithography, the surface of the substrate 01 must first be cleaned to remove dust, oil, and other impurities. This is typically done using organic solvents such as acetone or ethanol for ultrasonic cleaning, followed by rinsing with deionized water and drying.

[0133] Then, a first material layer is coated onto substrate 01. The coating method can be spin coating, spray coating, or blade coating, etc. The appropriate coating method is selected based on the properties of the first material layer and specific process requirements to control the thickness and uniformity of the first material layer. For example, during spin coating, the thickness of the first material layer is precisely controlled by adjusting the rotation speed and time. The first material layer is then cured.

[0134] Next, photoresist is coated onto the first material layer, and the photoresist is then softened to enhance the adhesion between the first material layer and the photoresist. The softening temperature and time vary depending on the type of photoresist.

[0135] Next, the cover plate coated with photoresist is placed in the photolithography machine, and the designed micro / nano structure pattern is projected onto the photoresist through a mask. A suitable light source is selected, such as ultraviolet (UV), deep ultraviolet (DUV), or extreme ultraviolet (EUV), with the wavelength determined based on the photoresist's photosensitivity and the required resolution. For example, for nanoscale resolution photolithography, deep ultraviolet light (e.g., 248nm or 193nm) or extreme ultraviolet light (e.g., 13.5nm) are commonly used. Following exposure, development, etching, and resist removal, a high-precision, high-quality micro / nano structure array 032 is formed.

[0136] In this embodiment, the photolithography process can achieve very high resolution, precisely control the size and shape of the micro / nano structure 033 to achieve nanometer-level precision, and the photolithography process has excellent repeatability, which can produce highly consistent micro / nano structures 033 with higher uniformity.

[0137] Based on the aforementioned cover plate, this application also provides a display panel that uses the aforementioned cover plate as the cover plate for the display panel. (Reference) Figure 8 , Figure 8 This application provides a schematic diagram of the structure of a display panel according to an embodiment of the present application; the display panel includes:

[0138] Substrate 04;

[0139] The light-emitting functional layer 05 is located on the substrate 04;

[0140] Encapsulation layer 06 covers the light-emitting functional layer 05;

[0141] The aforementioned cover plate is connected to the encapsulation layer 06 via the light-shielding frame 02.

[0142] Specifically, substrate 04 includes an array substrate, which may include a base layer and an array layer. The base layer may include a glass substrate or a plastic substrate, etc. The glass substrate provides a flat support structure for the display panel, capable of withstanding various processes in subsequent manufacturing, while ensuring that light can pass through smoothly. Plastic substrates are commonly used in flexible display panels. Their material is generally a polymer such as polyimide (PI), which can achieve flexibility of the display panel while ensuring a certain strength.

[0143] The array layer comprises a large number of regularly arranged thin-film transistor (TFT) arrays and pixel electrodes. These TFTs act as switches and drivers, precisely controlling the signal transmission and display state of each pixel, while the pixel electrodes interact with the light-emitting functional layer 05 to achieve image display. Furthermore, various circuit elements and wiring are integrated on the array substrate for transmitting electrical signals and controlling the operation of the entire display area to realize the display panel's display, signal transmission, and control functions.

[0144] On the side of the array layer away from the base layer, there is also a pixel definition layer. The pixel definition layer is used to isolate adjacent light-emitting units in the light-emitting functional layer 05 to prevent adjacent light-emitting units from affecting each other and thus affecting the light-emitting effect.

[0145] A planarization layer can also be provided between the substrate 04 layer and the light-emitting functional layer 05. This planarization layer can improve the flatness of the display panel surface, improve the yield of subsequent processes, and also protect the substrate from contamination, ensuring the reliability of the display panel.

[0146] The light-emitting functional layer 05 is a key layer for light emission in the display panel. For example, the material of the light-emitting functional layer 05 includes organic light-emitting materials (such as OLEDs). In OLEDs, the light-emitting functional layer 05 is typically composed of multiple sublayers, including a hole injection layer (HIL), a hole transport layer (HTL), an emissive layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL). These sublayers work together to achieve efficient injection, transport, and recombination of electrons and holes, thereby generating efficient light emission (not shown in the figure). It should be noted that this is only an example and does not specifically limit the light-emitting functional layer 05; it can also be a quantum dot material, etc.

[0147] The encapsulation layer 06 protects the structures in the light-emitting functional layer 05 and the substrate 04 from external environmental factors, such as moisture, oxygen, and dust, thereby improving the stability and lifespan of the display device. The encapsulation layer 06 may include organic encapsulation materials and inorganic light-emitting materials, without specific limitations.

[0148] A cover plate is attached to the side of the encapsulation layer 06 away from the light-emitting functional layer 05. This cover plate serves to protect the internal structure, enhance mechanical strength, and improve optical performance. This cover plate is the one described above, wherein the light-shielding frame 02 on the cover plate is made of a mixture of carbon black particles and optical adhesive material, which provides better adhesion to the encapsulation layer 06. The light-shielding frame 02 acts as a light-shielding element in the display panel, reducing light leakage.

[0149] Because the surface of the first hardened coating 03 of the cover plate away from the substrate 01 is a micro-nano structure array 032, the surface of the display panel has both anti-reflective properties and higher wear resistance, and the total thickness of the display panel is also reduced.

[0150] like Figure 5 As shown, when the light-shielding frame 02 and the encapsulation layer 06 are mounted, a transparent filler material layer 07 needs to be filled between the central area 011 of the substrate 01 and the encapsulation layer 06 to provide support. It should be noted that the central area 011 is the display area of ​​the display panel, so the light transmittance of the filler material layer 07 needs to be high.

[0151] In this embodiment, the cover plate of this application is used as the cover plate of the display panel, which can enhance the wear resistance of the display panel and reduce the reflectivity of the display panel, thereby significantly improving the service life and anti-reflection effect of the display panel.

[0152] In another embodiment of this application, a display device is also provided, including the display panel described above.

[0153] It is understood that the display device in the embodiments of this application can be any product or component with display function, such as OLED display device, QLED display device, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, wearable device, Internet of Things device, etc., and the embodiments disclosed in this application do not limit this.

[0154] In the description of this specification, references to terms such as "some embodiments," "another embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0155] 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 of 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.

[0156] 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 patent application. 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 cover plate, characterized in that, include: substrate; A first hardened coating is located on one side of the substrate; the first hardened coating includes a body portion and a micro / nano structure array, the body portion is located on the substrate, and the micro / nano structure array protrudes from the body portion in a direction away from the substrate; The micro / nano structure array comprises multiple arrayed micro / nano structures; in a first direction, the height of each micro / nano structure is less than the minimum value of a preset wavelength, and the first direction is perpendicular to the substrate; in a second direction, the maximum width of each micro / nano structure is less than the minimum value of the preset wavelength, and the second direction is parallel to the substrate; and in the second direction, the distance between the highest points of two adjacent micro / nano structures on the side away from the substrate is a first distance, which is less than the minimum value of the preset wavelength; the preset wavelength includes at least a portion of the visible light wavelength band.

2. The cover plate according to claim 1, characterized in that, The shape of the orthographic projection of the micro / nano structure onto the substrate includes polygons; Optionally, the polygon has a side length greater than or equal to 6; Optionally, the polygon is a regular hexagon.

3. The cover plate according to claim 1, characterized in that, The height of the main body in the first direction ranges from 3μm to 30μm.

4. The cover plate according to claim 1, characterized in that, The material of the first hardened coating includes a high-hardness resin material with a functionality greater than or equal to 9; Optionally, the high-hardness resin material accounts for 20%-50% of the composition of the first hardened coating material.

5. The cover plate according to claim 4, characterized in that, The material of the first hardened coating also includes inorganic nanoparticles; Optionally, the inorganic nanoparticles include alumina particles or silicon oxide particles; Optionally, the inorganic nanoparticles account for 5%-20% of the composition of the material in the first hardened coating; Alternatively, the material of the first hardened coating may also include a fluorinated hydrophobic agent; Optionally, the proportion of the fluoride hydrophobic agent in the material of the first hardened coating ranges from 5% to 20%. Alternatively, the material of the first hardened coating may also include inorganic nanoparticles and fluoride hydrophobic agents; Optionally, the inorganic nanoparticles account for 4%-27% of the composition of the first hardened coating material, and the fluorinated hydrophobic agent accounts for 1%-3% of the composition of the first hardened coating material.

6. The cover plate according to claim 1, characterized in that, The substrate includes a central region and an edge region, the edge region surrounding the central region; The cover plate further includes: a light-shielding frame located on the side of the substrate away from the first hardened coating, covering the edge area; Optionally, the material of the light-shielding frame includes a mixture of carbon black particles and optical adhesive material, wherein the carbon black particles account for less than 5% of the composition of the light-shielding frame material.

7. The cover plate according to claim 1, characterized in that, The preset wavelength includes all bands of the visible light wavelength.

8. A method for preparing a cover plate, characterized in that, include: Provide substrate; A first material layer is formed on one side of the substrate; The first material layer is imprinted using a first mold to form a micro-nano structure array; The first material layer having the micro-nano structure array is cured to form a first hardened coating.

9. A display panel, characterized in that, The display panel includes: Substrate; A light-emitting functional layer is located on the substrate; An encapsulation layer that covers the light-emitting functional layer; The cover plate according to any one of claims 1-8 is connected to the encapsulation layer by a light-shielding frame.

10. A display device, characterized in that, Includes the display panel as described in claim 9.

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