A high-transmittance composite film for liquid crystal displays

Abstract

This utility model relates to the field of composite films and discloses a high-transmittance composite film for liquid crystal displays. The high-transmittance composite film for liquid crystal displays includes a base layer, a microlens array disposed on one side of the base layer, the microlens array being hot-pressed onto one side of the base layer, an optical functional layer structure disposed on the side of the base layer where the microlens array is formed, the optical functional layer structure including an optical functional layer and a protective film, the optical functional layer having a protective film on the side of the optical functional layer facing away from the base layer, an anti-reflection layer structure disposed on the side of the base layer facing away from the microlens array, and a composite film protective structure disposed on the side of the anti-reflection layer structure facing away from the base layer. Through integrated structural design and precise material matching, it effectively reduces interface loss and stray light scattering during light transmission, improves light transmittance and light utilization to optimize display brightness, and also has multiple protective properties such as antistatic, anti-fouling, and anti-scratch.

Description

Technical Field

[0001] This utility model relates to the field of composite films, specifically a high-transmittance composite film for liquid crystal displays. Background Technology

[0002] As LCD technology extends to scenarios such as 8K ultra-high definition, automotive wide-temperature range, and outdoor high brightness, the market has placed stringent demands on the light transmittance, viewing angle and color consistency, and weather resistance of displays. As a core component for regulating light transmission and optimizing display effects, the performance of high-transmittance composite film directly determines the picture quality and lifespan of the display.

[0003] Existing composite films mostly adopt a discrete structure with independent functional layers stacked together. The lack of integrated design between functional layers leads to a surge in the number of interfaces and a significant increase in reflection loss. As a key structure for improving light utilization, the existing technology usually fabricates microlens arrays into independent thin films and then attaches them to the substrate surface with optical adhesive. This not only adds two interfaces, but also results in poor refractive index matching between the adhesive layer and the microlens array, which easily leads to stray light scattering. To address this, we propose a high-transmittance composite film for liquid crystal displays. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a high-transmittance composite film for liquid crystal displays, thus solving the aforementioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a high-transmittance composite film for liquid crystal displays, comprising a base layer;

[0006] A microlens array is disposed on one side of the substrate, and the microlens array is formed by hot pressing on one side of the substrate.

[0007] An optical functional layer structure is provided on the side of the substrate where the microlens array is formed. The optical functional layer structure includes an optical functional layer and a protective film. The optical functional layer is on the side of the microlens array away from the substrate, and the protective film is provided on the other side of the optical functional layer.

[0008] An antireflective layer structure disposed on the side of the substrate opposite to the microlens array;

[0009] A composite membrane protective structure is disposed on the side of the anti-reflective layer structure opposite to the base layer.

[0010] Preferably, the optical functional layer includes a phase compensation layer and an optically transparent adhesive. The phase compensation layer is coated on the side of the microlens array facing away from the substrate, and the other side of the phase compensation layer is bonded to the optically transparent adhesive.

[0011] Preferably, the side of the optically transparent adhesive that faces away from the phase compensation layer is bonded to the protective film, and the optically transparent adhesive corresponds to the liquid crystal display screen.

[0012] Preferably, the antireflective layer structure includes an antireflective underlayer and an antireflective middle layer. The antireflective underlayer is physically deposited on the side of the substrate facing away from the microlens array, and the antireflective middle layer is physically deposited on the other side of the antireflective underlayer.

[0013] Preferably, the antireflection layer structure further includes an antireflection layer high layer, wherein the antireflection layer high layer is physically deposited on the side of the antireflection layer opposite to the antireflection layer.

[0014] Preferably, the composite film protective structure includes an antistatic layer and a transition coating layer. The antistatic layer is coated on the side of the antireflective layer away from the antireflective intermediate layer, and the other side of the antistatic layer is coated with a transition coating layer.

[0015] Preferably, the composite membrane protective structure further includes an antifouling layer, and the side of the transition coating layer opposite to the antistatic layer is coated with an antifouling layer.

[0016] Compared with the prior art, this utility model provides a high-transmittance composite film for liquid crystal displays, which has the following beneficial effects:

[0017] This high-transmittance composite film for LCD displays, through its integrated structural design and precise material matching, effectively reduces interface loss and stray light scattering during light transmission. It can significantly improve light transmittance and light utilization to optimize display brightness, and ensure color consistency across all viewing angles through polarization correction. It also has multiple protective properties such as antistatic, anti-fouling, and anti-scratch, extending its service life while providing clear and stable display effects for various scenarios. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an exploded view of the structure of this utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of the high-transmittance composite film structure of this utility model;

[0021] Figure 4 This is a cross-sectional schematic diagram of the anti-reflective layer structure of this utility model.

[0022] In the diagram: 1. Base layer; 2. Phase compensation layer; 3. Optical transparent adhesive; 4. Protective film; 5. Anti-reflective layer structure; 6. Antistatic layer; 7. Transition coating layer; 8. Antifouling layer; 9. Microlens array; 10. Anti-reflective bottom layer; 11. Anti-reflective middle layer; 12. Anti-reflective top layer. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-4 A high-transmittance composite film for liquid crystal displays includes a base layer 1;

[0025] The microlens array 9 is disposed on one side of the substrate 1, and the microlens array 9 is formed by hot pressing on one side of the substrate 1.

[0026] An optical functional layer structure is provided on the side of the base layer 1 where the microlens array 9 is formed. The optical functional layer structure includes an optical functional layer and a protective film 4. The optical functional layer is on the side of the microlens array 9 away from the base layer 1, and the protective film 4 is provided on the other side of the optical functional layer.

[0027] An antireflective layer structure 5 is disposed on the side of the base layer 1 opposite to the microlens array 9;

[0028] A composite membrane protective structure is installed on the side of the anti-reflective layer structure 5 that is away from the base layer 1.

[0029] Furthermore, the optical functional layer includes a phase compensation layer 2 and an optical transparent adhesive 3. The phase compensation layer 2 is coated on the side of the microlens array 9 facing away from the base layer 1, and the other side of the phase compensation layer 2 is bonded to the optical transparent adhesive 3. The phase compensation layer 2 is made of liquid crystal polymer material and is coated on the microlens array 9. The base layer 1 is made of COP substrate.

[0030] Furthermore, the side of the optically transparent adhesive 3 facing away from the phase compensation layer 2 is bonded to the protective film 4. The optically transparent adhesive 3 corresponds to the liquid crystal display screen, and the protective film 4 is used to protect the optically transparent adhesive 3. When applying the film, the protective film 4 is peeled off.

[0031] Furthermore, the antireflective layer structure 5 includes an antireflective base layer 10 and an antireflective middle layer 11. The antireflective base layer 10 is physically deposited on the side of the base layer 1 facing away from the microlens array 9. The antireflective middle layer 11 is physically deposited on the other side of the antireflective base layer 10. The antireflective base layer 10 uses a high refractive index material, such as TiO2 or Ti3O5, and the antireflective middle layer 11 uses a medium refractive index material, such as Al2O3, and improves hardness and scratch resistance.

[0032] Furthermore, the antireflection layer structure 5 also includes an antireflection layer 12. The antireflection layer 11 has the antireflection layer 12 physically deposited on the side opposite to the antireflection layer 10. The antireflection layer 12 is made of a low refractive index material, such as SiO2.

[0033] Furthermore, the composite film protective structure includes an antistatic layer 6 and a transition coating layer 7. The antistatic layer 6 is coated on the side of the antireflective layer 12 away from the antireflective middle layer 11, and the other side of the antistatic layer 6 is coated with the transition coating layer 7. The antistatic layer 6 is used for antistatic purposes and is made of inorganic oxide materials to reduce dust adhesion.

[0034] Furthermore, the composite membrane protective structure also includes an antifouling layer 8. The transition coating layer 7 is coated with an antifouling layer 8 on the side opposite to the antistatic layer 6. The transition coating layer 7 is used to connect the antifouling layer 8 and the antistatic layer 6. The transition coating layer 7 is made of silane-modified acrylic resin. The antifouling layer 8 is used to reduce stain adhesion. The antifouling layer 8 is made of perfluoropolyether material.

[0035] Structural Description:

[0036] Base layer 1: This is the base layer, made of COP material, and is a flat sheet. It serves as the core carrier to support the functional layer and provides a low-loss substrate for light transmission.

[0037] Phase compensation layer 2: This is a phase compensation layer made of liquid crystal polymer material. It is a thin film that uniformly covers the microlens array. By adjusting the molecular orientation, it corrects the polarization shift of the liquid crystal emitted light, ensuring consistent color at different viewing angles.

[0038] Optical transparent adhesive 3: This is an optical transparent adhesive, in the form of a bubble-free colloid, which bonds the phase compensation layer and the protective film, and is then precisely bonded to the LCD screen to ensure continuous light transmission;

[0039] Protective film 4: This is a protective film, a smooth and flexible film that protects the surface of the optically transparent adhesive during transportation. The optically transparent adhesive can be exposed by peeling off the film when applying it.

[0040] Antireflection layer structure 5: This is an antireflection layer structure, which is composed of three layers of thin film continuously stacked. The whole structure is transparent. It achieves antireflection and antireflection through gradient refractive index design, thereby improving the light transmittance of the composite film.

[0041] Antistatic layer 6: This is an antistatic layer made of inorganic oxide materials. It is an ultra-thin transparent coating that covers the anti-reflective layer, releasing the static electricity accumulated on the film surface and reducing dust adsorption.

[0042] Transition Coating Layer 7: This is a transition coating layer made of silane-modified acrylic resin. It is a thin film that connects the antistatic layer and the antifouling layer. It utilizes the dual-functionality of the coating layer to achieve a strong bond between the two layers and solve the peeling problem.

[0043] Anti-fouling layer 8: This is an anti-fouling layer made of perfluoropolyether material. It is an ultra-thin film on the outermost layer of the composite film. It blocks fingerprints and oil stains from adhering through its low surface energy characteristics, and also has wear resistance and high and low temperature resistance.

[0044] Microlens array 9: This is a microlens array, which is integrally formed with the base layer through hot pressing. It is a hemispherical raised array that focuses the divergent light from the backlight into a directional beam, thereby improving light utilization.

[0045] Anti-reflection substrate 10: This is an anti-reflection substrate made of a high refractive index material. It is a thin film physically deposited on the substrate. The high refractive index characteristic is used to control the light refraction angle and provide optical support for the anti-reflection structure.

[0046] Anti-reflective intermediate layer 11: This is an anti-reflective intermediate layer made of medium refractive index material. It is a thin film deposited on the anti-reflective bottom layer to achieve a smooth transition of refractive index, while resisting external scratches and preventing light scattering.

[0047] Anti-reflection layer 12: This is an anti-reflection layer, made of low refractive index material, which is a thin film deposited in the middle layer of the anti-reflection layer. It forms a refractive index gradient with the air and works with the other two layers to cancel out reflected light.

[0048] Working principle: After light enters from the backlight, it first contacts the microlens array 9 on one side of the substrate 1. This array is integrally formed with the substrate through hot pressing, avoiding the interface loss of existing independent film bonding. The hemispherical protrusion structure focuses the diverging backlight light, and the originally scattered light is converged into a directional beam, improving the light utilization rate. At the same time, the COP substrate provides a low-loss transmission substrate for the light, solving the polarization disorder problem of the PET substrate. The focused light enters the phase compensation layer 2 on the surface of the microlens array. Its molecular orientation is precisely controlled, which can specifically correct the polarization shift of the liquid crystal emitted light. After passing through the phase compensation layer, the polarization state of the light tends to be uniform. It is then transmitted to the liquid crystal display screen via optical transparent adhesive 3. The optical transparent adhesive adheres precisely to the display screen, and the protective film 4 protects its surface during transportation. This film can be removed during application, ensuring a bubble-free bond and guaranteeing continuous light transmission. When light exits the display screen and reaches the antireflective layer structure 5 on the other side of the substrate, the gradient refractive index design plays a crucial role. The bottom antireflective layer 10 receives the light first; its high refractive index reduces the angle of refraction. The light then enters the middle antireflective layer 11, where the medium refractive index achieves a smooth transition with the bottom layer. Simultaneously, the high hardness of Al2O3 resists external scratches. To avoid scratches forming light scattering centers, the light ultimately reaches the antireflective layer 12, where the low refractive index forms a gradient connection with the air. The three layers are continuously stacked through physical deposition, and the 180° phase difference of the reflected light cancels each other out. After the emitted light passes through the antireflective layer, the antistatic layer 6 releases the static electricity accumulated on the film surface through free electrons, reducing light scattering caused by dust adsorption due to static electricity. The transition coating layer 7 uses silane groups to form chemical bonds with the inorganic antistatic layer, and the acrylic main chain is compatible with the organic antifouling layer, solving the problem of interlayer peeling. The outermost antifouling layer 8 can block the adhesion of fingerprints and oil stains, and is wear-resistant and resistant to high and low temperatures, ensuring the cleanliness and stability of the film surface.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-transmittance composite film for liquid crystal displays, characterized in that, Including the grassroots level (1); A microlens array (9) is disposed on one side of the base layer (1), and the microlens array (9) is formed by hot pressing on one side of the base layer (1). An optical functional layer structure is provided on the side of the substrate (1) where the microlens array (9) is formed. The optical functional layer structure includes an optical functional layer and a protective film (4). The optical functional layer is on the side of the microlens array (9) away from the substrate (1), and the protective film (4) is provided on the other side of the optical functional layer. An anti-reflection layer structure (5) is disposed on the side of the base layer (1) away from the microlens array (9); A composite membrane protective structure is disposed on the side of the anti-reflective layer structure (5) away from the base layer (1).

2. The high-transmittance composite film for liquid crystal displays according to claim 1, characterized in that, The optical functional layer includes a phase compensation layer (2) and an optical transparent adhesive (3). The phase compensation layer (2) is coated on the side of the microlens array (9) away from the base layer (1), and the other side of the phase compensation layer (2) is bonded to the optical transparent adhesive (3).

3. The high-transmittance composite film for liquid crystal displays according to claim 2, characterized in that, The side of the optically transparent adhesive (3) facing away from the phase compensation layer (2) is bonded to the protective film (4), and the optically transparent adhesive (3) corresponds to the liquid crystal display screen.

4. The high-transmittance composite film for liquid crystal displays according to claim 1, characterized in that, The antireflective layer structure (5) includes an antireflective base layer (10) and an antireflective middle layer (11). The antireflective base layer (10) is physically deposited on the side of the base layer (1) facing away from the microlens array (9), and the antireflective middle layer (11) is physically deposited on the other side of the antireflective base layer (10).

5. A high-transmittance composite film for liquid crystal displays according to claim 4, characterized in that, The antireflection layer structure (5) also includes an antireflection layer (12), and the antireflection layer (11) has the antireflection layer (12) physically deposited on the side opposite to the antireflection layer (10).

6. A high-transmittance composite film for liquid crystal displays according to claim 5, characterized in that, The composite film protective structure includes an antistatic layer (6) and a transition coating layer (7). The antistatic layer (6) is coated on the side of the antireflective layer (12) away from the antireflective middle layer (11), and the other side of the antistatic layer (6) is coated with the transition coating layer (7).

7. A high-transmittance composite film for liquid crystal displays according to claim 6, characterized in that, The composite membrane protective structure also includes an antifouling layer (8), and the transition coating layer (7) is coated with an antifouling layer (8) on the side opposite to the antistatic layer (6).

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