Composite light enhancement film with scratch-proof function

Abstract

The utility model discloses a kind of composite light-increasing films with scratch-proof function, including base layer, first light-increasing layer and second light-increasing layer, first light-increasing film is fixedly connected with base layer upper end, first light-increasing film is equipped with a plurality of first prism column at base layer one end, second light-increasing layer is equipped with in first light-increasing layer top, second light-increasing layer and first light-increasing layer between also be equipped with buffer layer, second light-increasing layer is equipped with a plurality of second prism column at first light-increasing layer one end, first prism column and second prism column are all set as isosceles trapezoidal, second prism column upper end is fixedly connected with protective layer. The technical scheme of the utility model can increase light-increasing effect, and when certain light-increasing layer is abraded, another light-increasing layer can make compensation to prevent light dark area, and isosceles trapezoidal prism column can increase top stress, avoid the problem of collapse and breakage caused by the stress difference of commonly used three prisms due to top too thin, thereby increase the scratch resistance of light-increasing film, and protective layer can further protect light-increasing film.

Description

Technical Field

[0001] This utility model relates to the field of brightness enhancement film, and in particular to a composite brightness enhancement film with anti-scratch function. Background Technology

[0002] Brightness enhancement film, also known as BEF, is an optical film with a uniform prism pattern precisely molded on the surface of highly transparent PET using acrylic resin. When assembled in front of a backlight, it focuses the light emitted by the light source toward the user of the display device, which can increase the brightness of the front by about 100% (when two orthogonal BEFs are used, there is a vertical BEF). Furthermore, light that is not used outside the viewing angle is recycled according to the light reflection effect and focused toward the user at the most appropriate angle.

[0003] A common brightness enhancement film (BEF) consists of a substrate and a prism structure layer. The prism structure layer is composed of many triangular prism strips arranged on the first optical surface of the substrate to converge light. These prism strips are arranged in one direction to form a prism array. When using the brightness enhancement film, the release paper on the back is peeled off, and the film is adhered to the object to be used through the adhesive layer. However, before use, when the brightness enhancement film comes into contact with other objects, its surface is easily worn or scratched, which can damage the film and affect its performance. Utility Model Content

[0004] The main purpose of this invention is to propose a composite brightness enhancement film with anti-scratch function, aiming to solve the technical problem that existing brightness enhancement films are prone to wear or scratches on the surface.

[0005] To achieve the above objectives, this utility model proposes a composite brightness enhancement film with anti-scratch function, comprising a base layer, a first brightness enhancement layer, and a second brightness enhancement layer. The first brightness enhancement film is fixedly connected to the upper end of the base layer. A plurality of first prism pillars are provided at the end of the first brightness enhancement film away from the base layer. A second brightness enhancement layer is provided above the first brightness enhancement layer. A buffer layer is also provided between the second brightness enhancement layer and the first brightness enhancement layer. A plurality of second prism pillars are provided at the end of the second brightness enhancement layer away from the first brightness enhancement layer. Both the first and second prism pillars are arranged in an isosceles trapezoidal shape. A protective layer is fixedly connected to the upper surface of the second prism pillar.

[0006] Preferably, it further includes a protective film, the first end of which is attached to the upper end of the protective layer and wrapped around the lower end of the base layer and attached to the base layer, and the tail end of which is wrapped around the base layer to the upper end of the protective layer and fixedly connected to the first end, so that the brightness enhancement film is completely wrapped inside the protective film.

[0007] Preferably, the protective film has an adhesive strip at its tail end, and the adhesive strip is bonded to the head end of the protective film.

[0008] Preferably, the protective layer is prepared by SiO2 / Al2O3 particles and UV-curable polyurethane acrylate (PUA) via a sol-gel method.

[0009] Preferably, the base layer is a PET film, wherein the PET film is doped with 3-5% glass microspheres.

[0010] The technical solution of this utility model has the following beneficial effects: The technical solution of this utility model increases the brightness enhancement effect by setting a dual brightness enhancement layer and a second brightness enhancement layer. When one brightness enhancement layer is worn, the other brightness enhancement layer can compensate to prevent the appearance of dark areas. The isosceles trapezoidal prism column can increase the force on the top and avoid the problem of breakage caused by the poor force on the top of the commonly used triangular prism due to its thin top, thereby increasing the scratch resistance of the brightness enhancement film. The protective layer can further protect the brightness enhancement film. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of a composite brightness enhancement film with anti-scratch function according to an embodiment of the present invention.

[0013] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0014] Reference numerals: 1. Base layer; 2. First brightening layer; 3. Buffer layer; 4. Second brightening layer; 5. Protective layer; 6. First prism column; 7. Second prism column; 8. Glass microspheres; 9. Protective film; 10. Adhesive strip. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0017] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0018] This invention proposes a composite brightness enhancement film with anti-scratch function.

[0019] like Figure 1 As shown in one embodiment of this utility model, a composite brightness enhancement film with anti-scratch function includes a base layer 1, a first brightness enhancement layer 2, and a second brightness enhancement layer 4. The first brightness enhancement film is fixedly connected to the upper end of the base layer 1. A plurality of first prism pillars 6 are provided at the end of the first brightness enhancement film away from the base layer 1. The second brightness enhancement layer 4 is provided above the first brightness enhancement layer 2. A buffer layer 3 is also provided between the second brightness enhancement layer 4 and the first brightness enhancement layer 2. A plurality of second prism pillars 7 are provided at the end of the second brightness enhancement layer 4 away from the first brightness enhancement layer 2. Both the first prism pillars 6 and the second prism pillars 7 are arranged in an isosceles trapezoidal shape. A protective layer 5 is fixedly connected to the upper surface of the second prism pillars 7.

[0020] Specifically, the base layer 1 is made of polyester (PET) film with excellent optical properties and high mechanical strength; the first brightening layer 2 is made of optical-grade acrylic resin, and the second brightening layer 4 is also made of optical-grade acrylic resin to ensure that it matches the first brightening layer 2 in terms of optical performance and physical properties, so as to achieve a better brightening effect; the buffer layer 3 is made of polyurethane (PU) material with good elasticity and optical transparency, which can not only effectively buffer external pressure and protect the prism structure, but also ensure the normal propagation of light and not affect the optical performance of the brightening film; the protective layer 5 is made of a material with high hardness and good light transmittance to achieve the anti-scratch function, such as hardened acrylic resin or silicone coating material, which can effectively resist external scratches without affecting the light transmission.

[0021] The first brightening layer 2 is fabricated, and the mold is processed. According to the design requirements, a mold with an isosceles trapezoidal first prism pillar 6 structure is fabricated using precision machining technology. The mold can be fabricated on a silicon wafer or metal template using processes such as photolithography and etching to ensure the dimensional accuracy of the first prism pillar 6. For example, the upper base side length of the isosceles trapezoid is set to 10-50μm, the lower base side length is set to 20-80μm, and the height is set to 20-100μm. The specific dimensions are determined according to the required brightening effect. After the mold is fabricated, optical grade acrylic resin is heated to a molten state or prepared into a liquid state suitable for pouring. The liquid resin is slowly injected into the mold to ensure that the resin fully fills the first prism pillar 6 structure of the mold and avoids the formation of air bubbles. The resin is cured by hot pressing or ultraviolet light curing. The first brightening layer 2 is tightly bonded to the upper surface of the base layer 1 using optically transparent adhesive.

[0022] The buffer layer 3 is fabricated and installed by heating polyurethane material to a flowable state and forming the buffer layer 3 on the surface of the first brightening layer 2 with the first prism pillar 6 by means of scraping, spraying or pouring, and controlling the thickness of the buffer layer 3 to be between 5 and 20 μm.

[0023] The second brightening layer 4 has the same structure as the first brightening layer 2 and is manufactured in a similar way. Before the buffer layer 3 is fully cured, the second brightening layer 4 is installed so that it can be better bonded to the buffer layer 3.

[0024] For the fabrication and installation of the protective layer 5, if hardened acrylic resin is selected as the material for the protective layer 5, it is mixed to a suitable viscosity and uniformly coated onto the upper surface of the second prism pillar 7 of the second brightening layer 4 by spin coating, spraying or other methods. The coating thickness is generally between 10 and 30 μm. After coating, the protective layer 5 is hardened by thermosetting or ultraviolet curing to form a surface with anti-scratch function.

[0025] This embodiment enhances the brightness by using a dual brightness enhancement layer 2 and a second brightness enhancement layer 4. When one brightness enhancement layer is worn, the other brightness enhancement layer can compensate to prevent dark areas from appearing. The isosceles trapezoidal prism column can increase the force on the top, avoiding the problem of breakage caused by the poor force on the top of the commonly used triangular prism, thereby increasing the scratch resistance of the brightness enhancement film. The protective layer 5 can further protect the brightness enhancement film.

[0026] Preferably, the brightness enhancement film is further provided with a protective film 9. The first end of the protective film 9 is attached to the upper end of the protective layer 5 and wrapped around the lower end of the base layer 1 and attached to the base layer 1. The tail end of the protective film 9 is wrapped around the base layer 1 to the upper end of the protective layer 5 and fixedly connected to the first end, so that the brightness enhancement film is completely wrapped in the protective film 9. The protective film 9 can be made of PET mold. The protective film 9 further protects the brightness enhancement film and prevents damage to the brightness enhancement film during handling or installation.

[0027] Preferably, the protective film 9 has an adhesive strip 10 at its tail end, which is bonded to the head end of the protective film 9. The adhesive strip 10 fixes the head and tail of the protective film 9 so that it can wrap the light enhancement film.

[0028] Optionally, the isosceles trapezoidal structures of the first prism pillar 6 and the second prism pillar 7 are both narrower at the top and wider at the bottom, and are disposed on the first brightening layer 2 and the second brightening layer 4.

[0029] Preferably, the protective layer 5 is prepared by SiO2 / Al2O3 particles and UV-cured polyurethane acrylate (PUA) through a sol-gel method. It has high hardness and can effectively protect the structure of the second prism pillar 7 of the second brightness enhancement film.

[0030] Preferably, the base layer 1 is a PET film, and the PET film is doped with 3-5% glass microspheres 8 to further improve the light transmittance.

[0031] Preferably, the first prism pillar 6 is embedded in the buffer layer 3, so that the buffer layer 3 can better protect the first prism pillar 6.

[0032] Specifically, the working principle and usage process of this utility model are as follows: the dual brightening setting of the first brightening layer 2 and the second brightening layer 4 increases the brightening effect. When one brightening layer is worn, the other brightening layer can compensate to prevent the appearance of dark areas. The isosceles trapezoidal prism column can increase the force on the top, avoiding the problem of breakage caused by the poor force on the top of the commonly used triangular prism due to its thin top, thereby increasing the scratch resistance of the brightening film. The protective layer 5 can further protect the brightening film.

[0033] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A composite brightness enhancement film with anti-scratch function, comprising a base layer (1), a first brightness enhancement layer (2), and a second brightness enhancement layer (4), characterized in that, The first brightening layer (2) is fixedly connected to the upper end of the base layer (1). The first brightening layer (2) is provided with a plurality of first prism pillars (6) at the end away from the base layer (1). The first brightening layer (2) is provided with a second brightening layer (4) above it. A buffer layer (3) is also provided between the second brightening layer (4) and the first brightening layer (2). The second brightening layer (4) is provided with a plurality of second prism pillars (7) at the end away from the first brightening layer (2). The first prism pillars (6) and the second prism pillars (7) are both arranged in an isosceles trapezoidal shape. A protective layer (5) is fixedly connected to the upper surface of the second prism pillar (7).

2. The composite brightness enhancement film with anti-scratch function according to claim 1, characterized in that, It also includes a protective film (9), the first end of which is attached to the upper end of the protective layer (5) and wrapped around the lower end of the base layer (1) and attached to the base layer (1), and the tail end of the protective film (9) is wrapped around the base layer (1) to the upper end of the protective layer (5) and fixedly connected to the first end, so that the light enhancement film is completely wrapped inside the protective film (9).

3. A composite brightness enhancement film with anti-scratch function according to claim 2, characterized in that, The protective film (9) has an adhesive strip (10) at its tail end, and the adhesive strip (10) is bonded to the head end of the protective film (9).

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