Wear-resistant optical structure and brightness enhancement film

Abstract

The utility model discloses a kind of wear-resistant optical structure and brightening film, it is related to optical film technical field.The wear-resistant optical structure, comprising: substrate layer;Microstructure layer is arrayed on substrate layer along preset direction;Smooth auxiliary agent layer is sprayed on the upper surface of microstructure layer;Wherein, microstructure layer is isosceles right prism, and the refractive index of isosceles right prism is greater than 1.6, to make optical structure have high brightness and wear resistance.The utility model, solve the existing brightening film product using high refractive index photocuring coating, but due to the relationship of chemical structure, nature is all relatively hard brittle, without resilience and toughness, therefore wear-resistant characteristics are all bad;And, conventional wear-resistant brightening film product is through the R corner structure of prism top angle, to disperse friction stress, and produce wear-resistant effect;But this mode destroys the integrity of prism microstructure, thus loss optical benefit, make brightening film product brightness reduce, not conducive to the purpose of improving the brightness of brightening film.

Description

Technical Field

[0001] This utility model relates to the field of optical film technology, and in particular to a wear-resistant optical structure and a brightness enhancement film. Background Technology

[0002] As displays demand increasingly higher brightness, conventional brightness enhancement films can only address this by continuously increasing the refractive index of the functional layer coating. However, a higher refractive index means greater hardness and brittleness, resulting in a less wear-resistant microstructure for the brightness enhancement film, thus limiting the application scenarios for high-brightness enhancement films.

[0003] Existing brightness enhancement films utilize high-refractive-index photocurable coatings, but due to their chemical structure, they are generally hard and brittle, lacking resilience and toughness, resulting in poor abrasion resistance. Furthermore, conventional abrasion-resistant brightness enhancement films achieve their abrasion resistance by dispersing frictional stress through the rounded corner structure at the prism's apex; however, this method disrupts the integrity of the prism's microstructure, thus sacrificing optical efficiency and reducing the brightness of the film, hindering its intended brightness enhancement purpose. Additionally, the rounded corner structure increases the contact area at the apex, correspondingly increasing the risk of adsorption. Currently, no effective solutions have been proposed to address these problems. Utility Model Content

[0004] Purpose of the utility model: To provide a wear-resistant optical structure and a brightness enhancement film, so as to at least solve one of the problems existing in the prior art.

[0005] Technical solution: A wear-resistant optical structure, comprising: Substrate layer; Microstructure layers are arrayed on the substrate layer along a predetermined direction; and A slip-enhancing agent layer is sprayed onto the upper surface of the microstructure layer; The microstructure layer is an isosceles right-angle prism with a refractive index greater than 1.6, so that the optical structure has high brightness and wear resistance.

[0006] Preferably, the isosceles right-angle prism has a refractive index of 1.64.

[0007] Preferably, the thickness of the slip agent layer is 1-5 μm.

[0008] Preferably, the isosceles right-angle prism has a width of 20-300 μm and a height of 10-40 μm.

[0009] Preferably, the microstructure layer further includes rounded corner prisms respectively disposed on both sides of the edge of the substrate layer; The height of the rounded corner prism is greater than the height of the isosceles right-angle prism.

[0010] Preferably, the slip agent layer contains nanoparticles; The diameter of the nanoparticles is 10-50 nm.

[0011] Preferably, the slip agent layer also contains a microcapsule self-healing structure.

[0012] Preferably, the substrate layer is PET, and the thickness of the PET is 50-500μm.

[0013] Preferably, the substrate layer is one of PET, PC, PMMA or PS.

[0014] To achieve the above objectives, according to another aspect of this application, a brightness enhancement film is also provided.

[0015] The brightness enhancement film according to this application includes the aforementioned wear-resistant optical structure.

[0016] Beneficial Effects: In this embodiment, a slip-adhesive layer is sprayed onto the upper surface of the microstructure layer. The microstructure layer is an isosceles right-angle prism with a refractive index greater than 1.6, enabling the optical structure to possess high brightness and wear resistance. This achieves the goal of improving wear resistance and maintaining high brightness, thus realizing the technical effect of ensuring high brightness while also possessing high wear resistance. This solves the problems of existing brightness enhancement film products using high-refractive-index photocurable coatings, which, due to their chemical structure, are relatively hard and brittle, lacking resilience and toughness, resulting in poor wear resistance. Furthermore, conventional wear-resistant brightness enhancement film products achieve wear resistance by dispersing frictional stress through the R-angle structure at the prism's apex; however, this method destroys the integrity of the prism's microstructure, thus sacrificing optical benefits and reducing the brightness of the brightness enhancement film, which is detrimental to its goal of improving brightness. Additionally, the R-angle structure increases the apex contact area, correspondingly increasing the product's adsorption risk. Attached Figure Description

[0017] Figure 1 This is a planar schematic diagram of the wear-resistant optical structure of this utility model; and Figure 2 This is a planar schematic diagram of another wear-resistant optical structure of this utility model.

[0018] The attached figures are labeled as follows: 10. Substrate layer; 20. Microstructure layer; 30. Smooth and slippery additive layer; 40. Rounded prism. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figure 1-2 As shown, this application relates to a wear-resistant optical structure and a brightness enhancement film. Figure 1 As shown, the wear-resistant optical structure includes: a substrate layer 10; the substrate layer 10 refers to the mechanical support base of the entire structure; it has good optical transparency, mechanical strength, dimensional stability and adhesion to the microstructure layer 20.

[0024] A microstructure layer 20 is arrayed on the substrate layer 10 along a preset direction. The microstructure layer 20 is periodically arrayed along the preset direction and can be formed by processes including but not limited to UV curing or molding. The preset direction can be a horizontal direction or the X-axis direction in a two-coordinate system.

[0025] A slip agent layer 30 is sprayed onto the upper surface of the microstructure layer 20; it can reduce the surface friction coefficient and reduce the wear of the prism apex angle by external friction; at the same time, it forms a transfer lubricating film under external scratching action to maintain the integrity of the microstructure; and prevent the prism apex angle from being rounded off, so as to maintain the optical performance without degradation.

[0026] The microstructure layer 20 is an isosceles right-angle prism with a refractive index greater than 1.6, so that the optical structure has high brightness and wear resistance.

[0027] It is important to know that the characteristics of an isosceles right-angle prism are that the apex angle of the prism is 90° and the waist angle is 45°; the incident light is refracted and totally reflected at the interface between the inclined plane of the prism and the air; and the directional focusing of light is achieved and the brightness of the emitted light is improved through the principle of geometric optics.

[0028] At the same time, a refractive index greater than 1.6 is used, that is, high refractive index optical materials are employed. For example, high refractive index UV-curable optical adhesives (sulfur-based acrylates).

[0029] This application retains the sharp corner structure at the top of the brightening film. By spraying a slip agent, the tip of the microstructure has a slip property, thereby improving the wear resistance of the product. There is no risk of adsorption and the optical benefits are not compromised.

[0030] The high-brightness enhancement film product prepared by this application uses a light-curing coating with a refractive index of 1.6 or higher, and a slip agent is sprayed on the prism apex corner of the enhancement film to solve the problem of the high-brightness enhancement film product being not wear-resistant.

[0031] As can be seen from the above description, this application achieves the following technical effects: In this embodiment, a slip agent layer 30 is applied to the upper surface of the microstructure layer 20. The microstructure layer 20 is an isosceles right-angle prism with a refractive index greater than 1.6, enabling the optical structure to possess high brightness and wear resistance. This achieves the goal of improving wear resistance and maintaining high brightness, thus realizing the technical effect of ensuring high brightness while also possessing high wear resistance. This solves the problems of existing brightness enhancement film products using high-refractive-index photocurable coatings, which, due to their chemical structure, are relatively hard and brittle, lacking resilience and toughness, resulting in poor wear resistance. Furthermore, conventional wear-resistant brightness enhancement film products achieve wear resistance by dispersing frictional stress through the R-angle structure at the prism's apex; however, this method destroys the integrity of the prism's microstructure, thus sacrificing optical benefits and reducing the brightness of the brightness enhancement film, which is detrimental to its goal of improving brightness. Additionally, the R-angle structure increases the apex contact area, correspondingly increasing the product's adsorption risk.

[0032] Furthermore, the isosceles right-angle prism has a refractive index of 1.64. This means it can achieve good brightness while also ensuring good physical properties.

[0033] Furthermore, the thickness of the slip agent layer 30 is 1-5 μm. It is understood that by adopting a thickness within the above-mentioned range, a continuous and complete low-friction protective film can be formed, effectively isolating external friction; at the same time, this thickness has a negligible impact on the absorption and scattering of visible light, and hardly reduces the brightness of the optical structure.

[0034] Of course, this thickness can be achieved through precision spraying, such as ultrasonic spraying, which is easy to control in mass production and consumes less material.

[0035] Furthermore, the isosceles right-angle prism has a width of 20-300 μm and a height of 10-40 μm. This allows for precise optical control. By using a height within the aforementioned range that is sufficiently large compared to the wavelength of visible light, and adhering to the principles of geometric optics, it enables efficient and precise control of light, avoiding stray light caused by diffraction effects. Simultaneously, it is easily achieved through precision rolling or UV curing processes, and the prism itself possesses sufficient mechanical strength, making it resistant to deformation or damage under pressure.

[0036] like Figure 2 As shown, the microstructure layer 20 also includes rounded corner prisms 40 respectively disposed on both sides of the edge of the substrate layer 10; The rounded-corner prism 40 has a greater height than the isosceles right-angle prism. This provides better protection for the isosceles right-angle prism, thereby improving its wear resistance and extending its service life. The rounded-corner prism 40 is an isosceles prism.

[0037] It is important to know that in applications such as backlight modules, the light incident angle at the edge of the panel is often larger and the light intensity is weaker. Therefore, the taller rounded corner prism 40 has a stronger light deflection and collection capability, which can bring the more tilted and weaker light from the edge area back to the front view.

[0038] It can also eliminate dark or bright edges. Through this differentiated microstructure design, the brightness of the entire light-emitting surface can be uniformized, effectively solving the unevenness problem of dark or bright edges that is common in traditional uniform arrays, and achieving excellent full-screen uniformity.

[0039] Furthermore, the slip agent layer 30 contains nanoparticles; The nanoparticles have a diameter of 10-50 nm. This allows for enhanced wear resistance; as a hard filler, the nanoparticles significantly improve the coating's hardness and scratch resistance. It also maintains transparency, as the nanoparticle size (10-50 nm) is much smaller than the wavelength of visible light, preventing significant Rayleigh scattering and ensuring the coating remains highly transparent without affecting optical performance. Furthermore, it optimizes surface properties; the nanoparticles can adjust the coating's surface microstructure and friction characteristics, and also provide additional benefits such as superhydrophobicity (lotus effect).

[0040] Furthermore, the slip-forming agent layer 30 also incorporates a microcapsule self-healing structure. Understandably, when a minor scratch occurs on the coating surface causing the capsule to rupture, the repair agent will flow out and, through polymerization reactions at the scratch location using, but not limited to, ambient light, heat, or moisture in the air, fill and heal the scratch. Simultaneously, this extends the product's lifespan, significantly improving its durability and long-term appearance and optical quality, while reducing maintenance requirements.

[0041] Furthermore, the substrate layer 10 is PET, and the thickness of the PET is 50-500 μm. This ensures good physical properties while also allowing for a variety of sizes to be selected, thus meeting diverse application needs.

[0042] Furthermore, the substrate layer 10 is one of PET, PC, PMMA, or PS. It is understood that this allows for the selection of multiple materials.

[0043] It is important to know that PET (polyethylene terephthalate) has good optical properties, mechanical strength and cost-effectiveness, making it suitable for making optical films.

[0044] PC (polycarbonate) has high toughness, impact resistance, and high temperature resistance, making it suitable for harsh environments.

[0045] PMMA (acrylic) has extremely high light transmittance and weather resistance, and good surface hardness.

[0046] PS (polystyrene) is characterized by low cost, ease of processing, and good optical properties.

[0047] This application also relates to a brightness enhancement film, including the aforementioned wear-resistant optical structure.

[0048] To better understand this application, the following embodiments are provided for further illustration: I. Fabrication of wear-resistant optical structures: By using a microstructure roller transfer method on a 125µm optical PET substrate, a photocurable adhesive with a refractive index greater than 1.6 is molded and transferred onto its surface to obtain a prism structure with a height of 35µm and a 90-degree apex angle.

[0049] Then, a layer of high-slip additive is sprayed onto the surface of the prism structure to obtain a high-brightness, wear-resistant, and brightening film product.

[0050] II. Test Method: Optical measurement was performed using BM-7A. Using a fixed weight, a brightening film is attached to the bottom. The back of the brightening film is used to rub the front of the brightening film sample to be tested. The linear speed is 8cm / second, the single-pass distance is 15cm, and one round trip is counted as one cycle.

[0051] Example 1 The prism microstructure was fabricated using UV adhesive with a refractive index of 1.61 and coated with F361 slip agent from Guangdong Aona Polymer Co., Ltd.

[0052] At this point, the test results for the brightness enhancement film were as follows: luminance of 7539 cd / m², luminance ratio of 100%, and abrasion resistance of no scratches.

[0053] Example 2 The difference between Example 2 and Example 1 is that UV glue with a refractive index of 1.64 was used to fabricate the prism microstructure.

[0054] At this point, the test results for the brightness enhancement film were as follows: luminance of 7766 cd / m², luminance ratio of 103%, and abrasion resistance of no scratches.

[0055] Example 3 The difference between Example 3 and Example 1 is that a UV glue with a refractive index of 1.68 was used to fabricate the prism microstructure.

[0056] At this point, the test results for the brightness enhancement film were as follows: luminance of 7986 cd / m², luminance ratio of 106%, and abrasion resistance of no scratches.

[0057] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that a UV adhesive with a refractive index of 1.61 was used to fabricate the prism microstructure, and the surface of the microstructure was not coated with F361 slip agent.

[0058] At this point, the test results for the brightness enhancement film were as follows: luminance of 7544 cd / m², luminance ratio of 100%, and abrasion resistance of severe scratch.

[0059] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that a UV adhesive with a refractive index of 1.61 was used to make the prism microstructure. The prism is an isosceles right-angled structure with a base width of 70 μm and a vertex angle of 2 μm. Furthermore, the surface was not coated with F361 slip agent.

[0060] At this point, the test results for the brightness enhancement film were as follows: luminance of 7381 cd / m², luminance ratio of 98%, and abrasion resistance of slight scratches.

[0061] The results of each embodiment and comparative example are shown in Table 1: Table 1 The test results above show that: As can be seen from Examples 1-3 and Comparative Examples 1-2, the brightness enhancement film prepared using this application has excellent wear resistance while possessing high brightness.

[0062] This application also has the following beneficial effects: 1. The key role of high refractive index (>1.6): a higher critical angle for total internal reflection. According to Snell's law, the higher the refractive index of a material, the smaller the critical angle for total internal reflection. This means that light is more easily lost through total internal reflection rather than refraction at the prism's inclined plane, thus greatly improving the efficiency of light utilization. Stronger light deflection ability. High refractive index materials can cause more significant light deflection at the interface, making the microstructure more capable of controlling the light path and the beam more concentrated.

[0063] 2. Reduce the coefficient of friction: The slippery additives (such as silicone) applied by spraying form an extremely slippery film on the surface. When a sharp object scratches the surface, the friction is greatly reduced. Friction is the main mechanical force that causes scratches. Reducing friction directly reduces the possibility of scratches.

[0064] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A wear-resistant optical structure, characterized in that, include: Substrate layer (10); A microstructure layer (20) is arrayed on the substrate layer (10) along a preset direction; and A slip agent layer (30) is sprayed onto the upper surface of the microstructure layer (20); The microstructure layer (20) is an isosceles right-angle prism, and the refractive index of the isosceles right-angle prism is greater than 1.6, so that the optical structure has high brightness and wear resistance.

2. The wear-resistant optical structure according to claim 1, characterized in that, The refractive index of the isosceles right-angle prism is 1.

64.

3. The wear-resistant optical structure according to claim 1, characterized in that, The thickness of the slip agent layer (30) is 1-5 μm.

4. The wear-resistant optical structure according to claim 1, characterized in that, The isosceles right-angle prism has a width of 20-300 μm and a height of 10-40 μm.

5. The wear-resistant optical structure according to claim 1, characterized in that, The microstructure layer (20) also includes rounded corner prisms (40) respectively disposed on both sides of the edge of the substrate layer (10); The height of the rounded corner prism (40) is greater than the height of the isosceles right-angle prism.

6. The wear-resistant optical structure according to claim 1, characterized in that, The slip-enhancing agent layer (30) contains nanoparticles; The diameter of the nanoparticles is 10-50 nm.

7. The wear-resistant optical structure according to claim 1, characterized in that, The slip-enhancing agent layer (30) also contains a microcapsule self-healing structure.

8. The wear-resistant optical structure according to claim 1, characterized in that, The substrate layer (10) is PET, and the thickness of PET is 50-500μm.

9. The wear-resistant optical structure according to claim 1, characterized in that, The substrate layer (10) is one of PET, PC, PMMA or PS.

10. A brightness enhancement film, characterized in that, Includes the wear-resistant optical structure as described in any one of claims 1-9.

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