Multilayer composite brightness enhancement film

Abstract

The utility model relates to the technical field of optical films, in particular to a multilayer composite brightness enhancement film. The technical scheme comprises a base material film layer. According to the utility model, the brightness enhancement film layer, the light scattering film layer, the anti-reflection film layer, the polarizing film layer, the anti-fouling film layer and other structures are matched, and the brightness enhancement film layer and the light scattering film layer enable a light source to be more uniform through uniform scattering and light direction adjustment, so that uneven brightness and color cast are avoided. The anti-reflection film layer keeps the primary color of display content by reducing surface reflection, and interference of an external light source is avoided. And the polarizing film layer is used for ensuring the polarization control of light, so that the chromatic aberration and uneven brightness caused by watching at different angles are reduced. And then the fluorocarbon coating and the hard coating are arranged in the anti-fouling film layer on the surface of the polarizing film layer, and when the fluorocarbon coating and the hard coating are combined for use, the hard coating provides physical protection, and the durability of the surface is enhanced. Finally, the fluorocarbon coating provides anti-fouling and easy-to-clean functions from chemical and physical properties.

Description

Technical Field

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

[0002] A gloss-enhancing film is a coating used to improve the gloss and brightness of an object's surface. It typically consists of specific optical materials or chemical coatings that enhance the surface's shine by increasing light reflection or refraction. This type of film is commonly found in electronic products, displays, automotive surfaces, eyeglass lenses, and many other fields. Traditional single-layer gloss-enhancing films, due to their optical properties, can cause problems such as color cast and uneven reflection while increasing brightness. Furthermore, they perform relatively poorly in resisting stains and fingerprints, easily leaving fingerprints, oil stains, and other marks, affecting the appearance.

[0003] Therefore, this utility model designs a multi-layer composite brightening film. Utility Model Content

[0004] The purpose of this invention is to address the problems of color cast and uneven reflection that arise from the optical properties of traditional single-layer brightness enhancement films while improving brightness. Furthermore, these films often exhibit relatively poor resistance to stains and fingerprints, easily leaving fingerprints, oil stains, and other marks that affect the appearance. Therefore, a multi-layer composite brightness enhancement film is proposed.

[0005] The technical solution of this utility model is as follows: a multilayer composite brightness enhancement film, including a substrate film layer, and further including: a brightness enhancement film layer, a light scattering film layer, an anti-reflection film layer, a polarizing film layer and an anti-fouling film layer sequentially attached to the substrate film layer; the anti-fouling film layer includes a fluorocarbon coating and a hard coating layer coated in layers.

[0006] Optionally, the brightening film layer has concave and convex structures on both its upper and lower surfaces to guide incident light to the user's viewing angle, and the upper and lower surfaces of the brightening film layer are bonded to the substrate film layer and the light scattering film layer.

[0007] Optionally, the upper surface of the light scattering film is provided with a nanostructure for scattering light, and the side of the light scattering film away from the brightening film is bonded to the anti-reflection film.

[0008] Optionally, the anti-reflective film layer is designed as a multilayer film, and the side of the anti-reflective film layer away from the light scattering film layer is bonded to the polarizing film layer with optical adhesive.

[0009] Optionally, the side of the polarizing film layer away from the anti-reflective film layer is bonded to the anti-fouling film layer with optical adhesive.

[0010] Optionally, the fluorocarbon coating may be made of silicon nitride, aluminum oxide, or hard resin.

[0011] Optionally, the hard coating material may be fluorinated ethylene propylene copolymer, fluorinated polymer and polytetrafluoroethylene.

[0012] Optionally, the thickness of the fluorocarbon coating is between 5 μm and 50 μm, and the thickness of the hard coating is between 2 μm and 50 μm.

[0013] In summary, this application includes at least one of the following beneficial technical effects:

[0014] This invention utilizes a combination of a brightness enhancement film, a light scattering film, an anti-reflection film, a polarizing film, and an anti-fouling film. The brightness enhancement film and light scattering film uniformly scatter and adjust the direction of light, making the light source more uniform and thus avoiding uneven brightness and color cast. The anti-reflection film reduces surface reflection, maintaining the original colors of the displayed content and preventing interference from external light sources. The polarizing film ensures polarization control of light, reducing color difference and brightness unevenness caused by viewing from different angles. The anti-fouling film layer on the surface of the polarizing film contains a fluorocarbon coating and a hard coating. When used together, the hard coating provides physical protection and enhances surface durability. Finally, the fluorocarbon coating provides anti-fouling and easy-to-clean properties through chemical and physical means. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a multilayer composite brightening film according to this utility model is provided;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the antifouling membrane layer.

[0018] Reference numerals: 1. Substrate film layer; 2. Brightening film layer; 3. Light scattering film layer; 4. Anti-reflection film layer; 5. Polarizing film layer; 6. Anti-fouling film layer; 61. Fluorocarbon coating; 62. Hard coating layer. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0020] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0021] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0025] like Figures 1 to 3As shown, this utility model proposes a multilayer composite brightness enhancement film, including a substrate film layer 1, and further comprising: a brightness enhancement film layer 2, a light scattering film layer 3, an anti-reflection film layer 4, a polarizing film layer 5, and an anti-fouling film layer 6 sequentially attached to the substrate film layer 1; the anti-fouling film layer 6 includes a layered coated fluorocarbon coating 61 and a hard coating layer 62. The fluorocarbon coating 61 is made of silicon nitride, aluminum oxide, and hard resin, while the hard coating layer 62 is made of fluorinated ethylene-propylene copolymer, fluorinated polymer, and polytetrafluoroethylene (PTFE). Fluorinated ethylene-propylene copolymer is a fluorinated polymer, usually copolymerized from ethylene and propylene, possessing excellent properties similar to PTFE, but easier to process. Fluorinated polymers refer to all fluorinated polymers, typically exhibiting excellent heat resistance, corrosion resistance, and chemical stability, and are widely used in applications in extreme environments. Polytetrafluoroethylene (PTFE) is a typical fluorinated polymer and one of the most common fluoropolymers, commonly known by the commercial name "Teflon". The thickness of the fluorocarbon coating 61 ranges from 5 μm to 50 μm, and the thickness of the hard coating 62 ranges from 2 μm to 50 μm, depending on the type of coating, application requirements, and coating process.

[0026] Furthermore, both the upper and lower surfaces of the brightness enhancement film layer 2 are provided with concave and convex structures to guide incident light to the user's viewing angle. These structures effectively focus and guide incident light in a specific direction. By optimizing light reflection and refraction, the amount of light radiated from the display screen or other light sources is increased, resulting in improved final display brightness. Under the same light source, precise light guidance achieves higher brightness, which helps improve the user's visual experience, especially in high-light environments such as outdoor devices under direct sunlight. The upper and lower surfaces of the brightness enhancement film layer 2 are bonded to the substrate film layer 1 and the light scattering film layer 3.

[0027] The light-scattering film 3 has a nanostructure on its upper surface that scatters light. Through nanoscale surface textures (such as nano-etching or nanoparticles), the direction and angle of light scattering can be controlled more precisely. This texture is typically fabricated using techniques such as nanoimprinting and photolithography. The nanostructure enables more efficient control of light scattering patterns, especially in applications requiring extreme control over the direction and angle of light scattering, such as OLED displays, backlight optimization, and fiber optic transmission. It reduces reflection, enhances optical effects, and improves visual performance, particularly for high-resolution, high-brightness displays. The side of the light-scattering film 3 away from the brightness-enhancing film 2 is bonded to the anti-reflective film 4.

[0028] Furthermore, the anti-reflective film layer 4 features a multi-layer thin-film design. This multi-layer anti-reflective film can be optimized for different wavelengths of light by designing multiple layers with different refractive indices. The refractive index and thickness of each layer can be adjusted according to a specific wavelength of light, allowing the multi-layer film to achieve anti-reflective effects over a wider wavelength range, far exceeding the effect of a single-layer film. The side of the anti-reflective film layer 4 away from the light scattering film layer 3 is bonded to the polarizing film layer 5 using optical adhesive, while the side of the polarizing film layer 5 away from the anti-reflective film layer 4 is bonded to the anti-fouling film layer 6 using optical adhesive.

[0029] In this embodiment, when a multi-layer composite brightness enhancement film is required, a brightness enhancement film layer 2, a light scattering film layer 3, an anti-reflection film layer 4, and a polarizing film layer 5 are sequentially disposed on one side of the substrate film layer 1. These layers are bonded together using adhesives or by hot pressing. The brightness enhancement film layer 2 and the light scattering film layer 3 uniformly scatter and adjust the direction of light, making the light source more uniform and thus avoiding uneven brightness and color cast. The anti-reflection film layer 4 reduces surface reflection, maintaining the original color of the displayed content and avoiding interference from external light sources. The polarizing film layer 5 ensures polarization control of light, reducing color difference and uneven brightness caused by viewing from different angles. An anti-fouling film layer 6 is then disposed on the surface of the polarizing film layer 5. The anti-fouling film layer 6 contains a fluorocarbon coating 61 and a hard coating 62. When the fluorocarbon coating 61 and the hard coating 62 are used together, the hard coating 62 provides physical protection, enhancing the surface durability. The fluorocarbon coating 61 provides stain resistance and easy cleaning through both chemical and physical properties. The combination of these two elements makes the product not only durable but also resistant to contamination during daily use, maintaining a clean appearance. Furthermore, this combination reduces fingerprint and oil residue and prevents scratches and abrasions on the display surface, further enhancing the product's lifespan and appearance. Finally, thanks to the combined effects of the fluorocarbon coating 61 and the hard coating 62, users require less time and effort to clean the surface, making daily maintenance much easier, especially for frequently touched or used devices such as touchscreens and displays.

[0030] The preferred embodiments of this utility model described above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A multilayer composite brightening film, comprising a substrate film layer (1), characterized in that, Also includes: Brightening film layer (2), light scattering film layer (3), anti-reflection film layer (4), polarizing film layer (5) and anti-fouling film layer (6) are sequentially applied to the substrate film layer (1). The antifouling membrane layer (6) includes a layered fluorocarbon coating (61) and a hard coating (62).

2. The multilayer composite brightening film according to claim 1, characterized in that, The brightening film layer (2) has concave and convex structures on both the upper and lower surfaces to guide incident light to the user's viewing angle. The upper and lower surfaces of the brightening film layer (2) are bonded to the substrate film layer (1) and the light scattering film layer (3).

3. The multilayer composite brightening film according to claim 1, characterized in that, The upper surface of the light scattering film (3) is provided with a nanostructure for scattering light, and the side of the light scattering film (3) away from the brightening film (2) is bonded to the anti-reflection film (4).

4. The multilayer composite brightening film according to claim 1, characterized in that, The anti-reflective film layer (4) is a multilayer thin film design, and the side of the anti-reflective film layer (4) away from the light scattering film layer (3) is bonded to the polarizing film layer (5) with optical adhesive.

5. The multilayer composite brightening film according to claim 1, characterized in that, The side of the polarizing film layer (5) away from the anti-reflective film layer (4) is bonded to the anti-fouling film layer (6) with optical adhesive.

6. The multilayer composite brightening film according to claim 1, characterized in that, The thickness of the fluorocarbon coating (61) is between 5 μm and 50 μm, and the thickness of the hard coating (62) is between 2 μm and 50 μm.

Images