Optical composite film and display device

Abstract

The utility model relates to an optical composite film. The optical composite film sequentially comprises a first prism layer, a first base material layer, a haze attaching layer, a second prism layer, a second base material layer and a high-haze diffusion layer from top to bottom. Wherein the first prism layer adopts a microstructure design, the bottom width of the first prism layer is smaller than that of the second prism layer, the bad phenomenon of light interference is avoided, the second prism layer is composed of a prism group composed of high prisms and low prisms, and multi-angle and multi-layer regulation and control of light are achieved. In addition, due to the arrangement of the haze attaching layer and the high-haze diffusion layer, the diffusion effect and the shielding performance of the optical composite film are enhanced. Through the integrated design, the functions of a traditional multi-layer optical film and a diffusion plate are combined into a single film, the product weight and thickness are reduced, the product structure and the assembly process are simplified, and the production efficiency and reliability are improved. High optical gain is maintained, high shielding performance is achieved, and the advantages of improving display image quality, reducing product weight and thickness, simplifying product structure and assembly process and the like are achieved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an optical composite film and a display device. Background Art

[0002] In today's society, as people's living standards continue to improve, entertainment methods are becoming increasingly rich and diverse. As a bridge connecting the information world and daily life, electronic products such as televisions, mobile phones, computers and tablets have shown a blowout growth in market demand. These electronic products have not only become necessities for people to obtain information and enjoy entertainment, but have also shaped the face of modern life to a large extent. In this context, optical composite films, as one of the key components to enhance the display effect and user experience of electronic products, have also ushered in unprecedented opportunities and challenges in their technological development and market demand.

[0003] In recent years, optical composite film technology has made certain achievements, from the initial simple stacking of multi-layer composite film materials to the successful integration of key components such as polarizers and diffusers into a single composite film structure. This technological innovation has reduced production costs, simplified production processes, and improved production efficiency. However, despite the many achievements of integrated optical composite film technology, it still faces some urgent problems in its further development and widespread application.

[0004] How to further improve the optical performance of composite films, such as higher light transmittance, more uniform brightness distribution, and wider viewing angle range, while ensuring the integrated structural strength of the composite film, is the focus and difficulty of current technology research and development. As electronic products develop towards higher definition and lower energy consumption, how to reduce the production cost of composite films while achieving longer service life and better environmental adaptability is also an important issue facing the industry. In addition, with the continuous emergence of new technologies such as 5G and the Internet of Things, how to better integrate optical composite film technology with these cutting-edge technologies to support the development of more intelligent and personalized electronic products is also a problem that needs to be explored and solved in depth. Utility Model Content

[0005] The purpose of the present application is to provide an optical composite film, which can combine the application of optical films in display devices into a single sheet; the composite film simultaneously satisfies the focusing and diffusion effects, replaces the diffusion film and the diffusion plate, integrates the POP composite film and the diffusion film into one, and replaces the use of the optical film + diffusion plate. The optical composite film of the present application includes a first prism layer, a first substrate layer, a haze bonding layer, a second prism layer, a second substrate layer, and a high haze diffusion layer from top to bottom;

[0006] The bottom width of the first prism layer is less than that of the second prism layer. The second prism layer is composed of prism groups, and one prism group includes one high prism and more than one low prism;

[0007] Wherein, the first prism layer, the first substrate layer, the haze bonding layer, the second prism layer, the second substrate layer and the high-haze diffusion layer are sequentially connected to form a whole. The haze of the haze bonding layer is in the range of 40% - 90%, and the haze of the high-haze diffusion layer is greater than 90%.

[0008] In one embodiment, the bottom width of the first prism layer is in the range of 20 - 25 μm.

[0009] In one embodiment, the structure of the first prism layer is an up-and-down jitter curve-shaped triangular structure.

[0010] In one embodiment, the bottom width of the prism in the second prism layer is in the range of 60 - 70 μm.

[0011] In one embodiment, the prism group in the second prism layer is composed of one high prism and one low prism. The bottom width of the high prism is in the range of 65 - 70 μm, and the bottom width of the low prism is in the range of 60 - 65 μm.

[0012] In one embodiment, the prism structures in the first prism layer and the second prism layer are isosceles triangle structures, and the apex angle is in the range of 70° to 100°.

[0013] In one embodiment, the apex angle is a 90° structure.

[0014] In one embodiment, the prisms in the first prism layer and the second prism layer are made by a transfer method using ultraviolet curable glue, and the refractive index of the ultraviolet curable glue is in the range of 1.5 - 1.7.

[0015] In one embodiment, part of the prisms in the second prism layer are embedded in the haze bonding layer.

[0016] In addition, the present application also provides a display device, which includes the aforementioned optical composite film.

[0017] Compared with the prior art, the present application has the following beneficial effects: The present application provides a novel optical composite film, which can replace the traditional diffusion film and diffusion plate, and realizes the high integration of the optical film and the diffusion function. The optical composite film of the present application sequentially includes a first prism layer, a first substrate layer, a haze bonding layer, a second prism layer, a second substrate layer, and a high-haze diffusion layer from top to bottom. The present application simplifies the optical film and diffusion plate that originally needed to be stacked in multiple layers into a single composite film, greatly reducing the total thickness and weight of the product. The total thickness of the optical composite film of the present application is much lower than that of the traditional "POP + diffusion plate" structure, and the weight of a single composite film is controlled below 1 kg, making the whole display device more lightweight and portable. Moreover, for the assembly manufacturer, only a single optical composite film needs to be assembled, and there is no need to additionally assemble a diffusion plate, significantly improving the assembly efficiency and reducing the manufacturing cost.

[0018] Through unique structural designs (such as the difference in bottom width, the composition of the prism group, etc.), the first prism layer and the second prism layer achieve efficient light condensation and diffusion, while avoiding the phenomenon of light interference between multiple interfaces, effectively reducing abnormal phenomena such as rainbow patterns on the screen and improving the display effect. The high-haze diffusion layer achieves an efficient light diffusion effect, and also reduces the risk of rainbow patterns of the optical film due to its high shielding property, improves the yield of the product manufacturing process, and reduces waste loss. The dual-haze design of the haze bonding layer and the high-haze diffusion layer not only improves the shielding property of the product, but also effectively improves the visual experience of the screen through its unique diffusion mechanism, making the screen softer and more natural, and enhancing the viewing comfort of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the optical composite film in an embodiment of the present application.

[0020] Description of the reference numerals: 100, first prism layer; 200, first substrate layer; 300, haze bonding layer; 400, second prism layer; 500, second substrate layer; 600, high-haze diffusion layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the above objects, features, and advantages of the present application more obvious and understandable, the following detailed description of the specific embodiments of the present application will be given in conjunction with the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. In addition, it should be noted that for the sake of description, only parts related to the present application are shown in the accompanying drawings rather than all the structures. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0022] As used in this application, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices.

[0023] References to "an embodiment" in this document mean that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase may not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] Traditionally, in order to achieve effects such as light concentration, diffusion, and brightening, a combination of multiple optical films and a diffusion plate is often used in electronic products. However, this design increases the complexity and weight of the product, and may also cause interference of light between different interfaces, affecting the uniformity and clarity of the picture. To overcome these drawbacks, this application provides a new optical composite film. The optical composite film of this application will be introduced in detail below. Please refer to Figure 1 In an optical composite film according to a preferred embodiment of this application, the optical film sheets are laminated into a single sheet, satisfying both the light concentration and diffusion effects at the same time. The optical composite film sequentially includes a first prism layer 100, a first substrate layer 200, a haze bonding layer 300, a second prism layer 400, a second substrate layer 500, and a high-haze diffusion layer 600 from top to bottom. The bottom width of the first prism layer 100 is smaller than the bottom width of the second prism layer 400 to avoid poor picture interference. The second prism layer 400 is composed of a prism group. One prism group includes a high prism and one or more low prisms. The high prism is a prism with a relatively high height, and the corresponding bottom width also increases accordingly. The low prism is a prism with a relatively low height, and the corresponding bottom width will also decrease accordingly. Among them, the first prism layer 100, the first substrate layer 200, the haze bonding layer 300, the second prism layer 400, the second substrate layer 500, and the high-haze diffusion layer 600 are sequentially connected to form a whole. The haze of the haze bonding layer 300 is in the range of 40% - 90%, and the haze of the high-haze diffusion layer 600 is greater than 90%.

[0025] The multi-layer structure realizes precise control of light and also improves the quality and visual experience of the display screen. The first prism layer 100, as the uppermost layer of the optical composite film, adopts a micro-structure design. Its bottom width is set to be smaller than that of the underlying second prism layer 400, effectively avoiding the interference defects that may occur when light propagates between the multi-layer structures, ensuring smooth transmission and uniform distribution of light, thereby reducing stray light and dark areas in the screen and enhancing the clarity and contrast of the screen. The second prism layer 400 consists of prism groups. Each prism group includes a high prism and one or more low prisms, realizing multi-angle and multi-level control of light. Such a combined design enables the second prism layer 400 to flexibly handle light incident from different directions, achieving precise guiding and efficient utilization of light, and further enhancing the brightness and uniformity of the screen.

[0026] The integrated connection of the multi-layer structure realizes a tight and stable connection between the first prism layer 100, the first substrate layer 200, the haze bonding layer 300, the second prism layer 400, the second substrate layer 500, and the high-haze diffusion layer 600 through bonding technology or an integrated molding process, forming an integral optical composite film. Through the precise design and optimization of the multi-layer structure, combined with the haze bonding layer 300 and the high-haze diffusion layer 600 with different haze ranges, the optical composite film effectively reduces interference and scattering during light transmission. The integrated design of the optical composite film replaces the traditional complex combination of multi-layer optical films and diffusion plates, not only reducing the weight and thickness of the product, but also simplifying the product structure and assembly process, and improving production efficiency and reliability.

[0027] In the prior art, the architecture of direct-lit backlight is usually "D + POP + diffusion plate" or "high-haze POP + diffusion plate", which requires the use of a diffusion plate to effectively diffuse the upward light source of the lamp beads and the light-gathering effect of a brightness enhancement film to converge the light source to a fixed viewing angle range to increase the front-viewing brightness. In this application, an integrated architecture of "POP + D" is adopted, and a high-haze diffusion layer 600 (formed by adding titanium dioxide therein) is added below the POP with haze, enabling the product to have high shielding properties while having high optical gain, thereby achieving the effect of integrating the POP optical film and the diffusion plate.

[0028] In the "PPD" architecture composite film of this application, the substrate layer can be selected to be 100 - 250 μm depending on the usage object. The total thickness is much lower than that of the traditional "POP + diffusion plate" architecture. The weight of a single composite film will be less than 1 kg. Compared with the weight of the "POP + diffusion plate", the integration of a single composite film in this application can also make the whole machine lighter and more convenient. In this application, the functions of the optical film and the diffusion plate are combined into a single film, which can be achieved by optical film manufacturers with only appropriate process adjustments. Moreover, the high shielding property of the high haze diffusion layer 600 can effectively improve the product process yield and reduce product scrapping losses. For assembly manufacturers, it can be optimized to only assemble a single optical composite film without assembling the diffusion plate again, which can effectively improve the assembly efficiency and thus reduce costs.

[0029] Compared with the traditional architecture of "upper diffusion film + POP composite film + diffusion plate", in this application, a high haze diffusion layer 600 is added under the high haze POP optical film. The high haze diffusion layer 600 combines light diffusion and improves the shielding effect of the optical film, which can play the same role as the diffusion plate, equivalent to integrating the high haze POP optical film and the diffusion plate into one. This architecture is compounded into an optical film, which can reduce the thickness of the stacked multi-layer optical films to the thickness of a single composite film, indirectly reducing the overall thickness of the display device and making the product thinner and lighter.

[0030] The high shielding property of the composite film product in this application comes from two haze layers, namely the haze bonding layer 300 and the high haze diffusion layer 600. The haze bonding layer 300 obtains a certain haze by adding acrylic microparticles to the bonding resin. With its shielding property, the haze bonding layer 300 can avoid the interference risk generated by the upper and lower prism layers to a certain extent and can also effectively improve the rainbow pattern abnormality of the picture, thus achieving the same effect as the upper diffusion film. Different from the conventional diffusion film, the diffusion effect of the high haze diffusion layer 600 in this application comes from titanium dioxide (the main component is TiO2). The addition of titanium dioxide in the high haze and high diffusivity also has a high shielding effect, which can effectively reduce the rainbow pattern risk of the optical film. The haze of the haze bonding layer 300 is in the range of 40% - 90%, and the haze of the high haze diffusion layer 600 is greater than 90%, enabling the high haze diffusion layer 600 to achieve the same role as the diffusion plate in the traditional architecture, achieving the purpose of the designed diffusion and brightness enhancement integration, being thinner than the traditional multi-layer architecture, making the whole display device lighter, and at the same time improving the film assembly efficiency.

[0031] Specifically, the bottom width of the first prism layer 100 is in the range of 20 - 25 μm. Setting the bottom width of the first prism layer 100 within the above range is beneficial for precise regulation of light when it enters the composite film. The prism structure within this size range can effectively guide light to propagate in a predetermined direction, reducing unnecessary scattering and reflection, and improving the utilization rate and transmission efficiency of light. Due to the precise regulation of light by the first prism layer 100, the light entering the display device is more uniform and stable, enhancing the clarity and contrast of the picture, and reducing the phenomenon of picture blurring and dark areas caused by uneven light distribution.

[0032] Specifically, the structure of the first prism layer 100 is an up-and-down jittery curve-shaped triangular structure. This design is different from planar or single-curvature limitations. By controlling the size, tilt angle of each triangle, and their relative positions, a changing surface topography is constructed, which not only optimizes the refraction and reflection paths of light, but also effectively improves the anti-adsorption function of the prism layer due to its complex surface morphology. The prism layer with an up-and-down jittery curve-shaped triangular structure has multiple tiny concave and convex surfaces and changing angles on its surface. The prism layer can play its optical regulation role more effectively, reduce light loss, contribute to improving the light transmittance and utilization rate, and further enhance the optical efficiency and display effect of the entire optical system. By improving the anti-adsorption function, a continuous and clear picture effect is ensured, thereby enhancing the overall user satisfaction and loyalty.

[0033] Specifically, the bottom width of the prisms in the second prism layer 400 is in the range of 60 - 70 μm. As one of the key layers for light regulation in the optical composite film, the bottom width of the prisms in the second prism layer 400 is carefully set within the range of 60 - 70 μm, taking into account the propagation path and energy distribution of light after it enters the second prism layer 400 from the first prism layer 100, ensuring a smooth transition and efficient conversion of light between the two layers. At the same time, the bottom width range of 60 - 70 μm also provides sufficient structural strength for the prisms, ensuring their stability and durability in a complex stress environment. By precisely controlling the bottom width range of the prisms in the second prism layer 400, production process parameters can be optimized, reducing variability and uncertainty during production, and contributing to improving production efficiency and the yield rate.

[0034] Specifically, the prism group in the second prism layer 400 consists of a high prism and a low prism. The bottom width of the high prism is in the range of 65 - 70 μm, and the bottom width of the low prism is in the range of 60 - 65 μm. The combined design of the high prism and the low prism significantly improves the optical gain effect by optimizing the light propagation path and energy distribution within the layer. When light passes through the prism group, it can experience a fine refraction and reflection process, thereby achieving more precise control of the light direction. At the same time, the combined use of the high prism and the low prism synergistically makes the light propagation within the layer more orderly and efficient, realizing further optimization of the light distribution.

[0035] Specifically, the prism structures in the first prism layer 100 and the second prism layer 400 are isosceles triangle structures, and the apex angle is in the range of 70° to 100°. The two sides of the isosceles triangle are of equal length, enabling the prism to maintain high precision and consistency during manufacturing. At the same time, the apex angle of the isosceles triangle is set in the range of 70° to 100°, ensuring that when light passes through the prism, appropriate refraction and reflection can occur, neither too strong to cause energy loss nor too weak to achieve effective light control. By optimizing the geometric shape and apex angle range of the prism, the optical performance of the optical composite film is improved, including higher light transmittance, lower reflectivity, and more uniform light distribution, etc. The isosceles triangle, as the basic shape of the prism, has the advantages of simple structure and convenient processing, which helps to reduce the manufacturing cost and difficulty of the prism, and improve the production efficiency and yield rate. Preferably, the apex angle is a 90° structure, and the apex angles of the prism structures in the first prism layer 100 and the second prism layer 400 are set as right-angle structures, simplifying the geometric shape of the prism and making it easier to control the precision and consistency during the processing.

[0036] Specifically, the prisms in the first prism layer 100 and the second prism layer 400 are made by a transfer printing method using ultraviolet (UV) curable glue, and the refractive index of the UV curable glue is in the range of 1.5 - 1.7. The UV curable glue transfer printing technology can achieve high-precision replication of the prism structure, ensuring that the size, shape, and angle of each prism meet the design requirements, which helps to improve the overall performance and consistency of the optical composite film. The UV curable glue has the characteristic of rapid curing, which can complete the curing process in a short time, thereby shortening the production cycle and improving the production efficiency. By selecting the UV curable glue with a refractive index in the range of 1.5 - 1.7 as the manufacturing material, fine control of the light propagation characteristics in the prism can be achieved, which helps to optimize the refraction and reflection paths of light and improve the optical efficiency and imaging quality of the optical composite film.

[0037] Specifically, the prism part in the second prism layer 400 is embedded in the haze bonding layer 300. During the manufacturing process, methods such as injection molding, embossing, or laser etching are used to ensure that a part of the top of the prism can be embedded into the matrix of the haze bonding layer 300. In this process, the selection of the material of the haze bonding layer 300 is crucial. It needs to have good flexibility and a certain bonding strength to wrap and fix the prism part while maintaining its own optical properties. After the prism part is embedded in the haze bonding layer 300, the two form a stable overall structure, effectively improving the impact resistance and durability of the product. Even when subjected to external forces, it can better maintain the stability and consistency of the optical performance.

[0038] In addition, the present application also provides a display device, which includes the aforementioned optical composite film.

[0039] Next, the technical solution of the present application will be described in detail with a specific embodiment and compared with the comparative example.

[0040] Example 1

[0041] The schematic diagram of the composite plate structure from top to bottom is the upper prism layer, the upper substrate layer, the haze bonding layer, the lower prism layer, the lower substrate layer, and the high-haze diffusion layer (haze ≥ 90%). A high-haze diffusion layer is added to the lower part of the high-haze POP optical film. The high-haze diffusion layer combines light diffusion and improves the shielding effect of the optical film, which can play the same role as a diffusion plate, equivalent to laminating the high-haze POP optical film and the diffusion plate into one. This architecture is compounded into an optical film, which can reduce the thickness of the stacked multi-layer optical films to the thickness of a single composite film, indirectly reducing the overall thickness of the display device and making the product thinner and lighter.

[0042] In the present application, by using a smaller upper prism structure, the bottom width of the first prism layer is set at 20 - 25 μm to avoid poor picture interference; and the structure of the first prism layer is designed as an up-and-down jitter curve-shaped triangular structure to improve the anti-adsorption function. The second prism layer is designed as a high-low unequal-height prism, and the bottom width range of the prism is 60 - 70 μm, preferably a one-high-one-low prism structure with bottom widths of 70 μm and 60 μm respectively to improve the optical gain effect. The prism structures in the first prism layer and the second prism layer are both isosceles triangle structures, with the apex angle in the range of 70° to 100°, preferably a 90° structure, and the prisms are all obtained by replicating with ultraviolet curable glue, and the refractive index range of the glue is 1.5 - 1.7.

[0043] Comparative Example 1

[0044] In Comparative Example 1, the architecture of "upper diffusion film + POP composite film + diffusion plate" is adopted, and the material thickness of each layer is the same as that in Example 1.

[0045] Comparative Example 2

[0046] In Comparative Example 1, the structure of "high haze POP + diffusion plate" was adopted, and the material thickness of each layer was the same as that in Example 1.

[0047] Table 1 Test results of specific embodiments

[0048] Total thickness (μm) Assembly efficiency Masking property Rainbow pattern Brightness ratio (%) Example 310 High Good Low 113 Comparative example 1 1500 Low Good Low 100 Comparative example 2 1300 Medium Good Medium 95

[0049] From the above test content, it can be seen that the integrated structure of the technical solution of this application can not only reduce the total thickness and the risk of rainbow patterns, improve the assembly efficiency, but also improve the brightness of the optical film to a certain extent. The traditional "D + POP + diffusion plate" structure has the lowest assembly efficiency; the "high haze POP + diffusion plate" stacked structure has more luminance loss. This application adopts the "high haze POP + D" integrated structure, in which the high haze diffusion layer plays the role of replacing the diffusion plate, which is different from the traditional "D + POP + diffusion plate" or "POP + diffusion plate" structure, making the composite film and the diffusion plate integrated. The single composite film structure of integrating POP and the diffusion plate is one of the main key points of this application.

[0050] As can be seen from the foregoing, this application proposes a new optical composite film. Through the combination and optimization of multi-layer structures, the optical composite film integrates a first prism layer, a first substrate layer, a haze bonding layer, a second prism layer, a second substrate layer, and a high haze diffusion layer from top to bottom, forming a highly integrated whole. The first prism layer, as the uppermost layer, adopts a micro-structure design, and its bottom width is smaller than that of the second prism layer, effectively avoiding the phenomenon of poor light interference and ensuring the smooth transmission and uniform distribution of light. The second prism layer realizes the multi-angle and multi-level regulation of light through a unique prism group design, including the combination of high prisms and low prisms, enhancing the brightness and uniformity of the picture.

[0051] The multi-layer structures are tightly connected to form a whole, which not only reduces the weight and thickness of the product, but also simplifies the product structure and assembly process, improving production efficiency and reliability. At the same time, in this application, by adding a high haze diffusion layer under the high haze POP optical film, the integration effect of the optical film and the diffusion plate is achieved, reducing the overall thickness and improving the thinness and lightness of the product and the assembly efficiency. The bottom width of the first prism layer is set within the range of 20 - 25 μm, and the up-and-down jitter curve-shaped triangular structure is adopted to optimize the refraction and reflection paths of light and improve the anti-adsorption function.

[0052] In summary, through the optimized design and integrated connection of the multi-layer structure of the optical composite film of this application, the precise regulation and efficient utilization of light are achieved, improving the clarity, contrast, and brightness of the display picture, and providing a more excellent visual experience for the display device. At the same time, its thin and light design and high assembly efficiency also meet the market's demand for product light weight and high-efficiency production.

[0053] The above is only a specific embodiment of the present application, and any improvements made on the premise of the concept of the present application are regarded as the protection scope of the present application.

Claims

1. An optical composite film, characterized in that: The invention comprises, from top to bottom, a first prism layer (100), a first substrate layer (200), a haze bonding layer (300), a second prism layer (400), a second substrate layer (500), and a high haze diffusion layer (600); The bottom width of the first prism layer (100) is smaller than the bottom width of the second prism layer (400), the second prism layer (400) is composed of prism groups, and one of the prism groups includes a high prism and one or more low prisms; The first prism layer (100), the first substrate layer (200), the haze bonding layer (300), the second prism layer (400), the second substrate layer (500) and the high haze diffusion layer (600) are sequentially connected to form a whole, the haze of the haze bonding layer (300) is in the range of 40%-90%, and the haze of the high haze diffusion layer (600) is greater than 90%.

2. The optical composite film according to claim 1, characterized in that: The base width of the first prism layer (100) is in the range of 20-25 μm.

3. The optical composite film according to claim 1, characterized in that: The structure of the first prism layer (100) is a triangular structure with an up-and-down shaking curve.

4. The optical composite film according to claim 3, characterized in that: The base width of the prisms in the second prism layer (400) is in the range of 60-70 μm.

5. The optical composite film according to claim 4, characterized in that: The prism group in the second prism layer (400) consists of a high prism and a low prism, the base width of the high prism is in the range of 65-70 μm, and the base width of the low prism is in the range of 60-65 μm.

6. The optical composite film according to claim 1, characterized in that: The prism structures in the first prism layer (100) and the second prism layer (400) are isosceles triangle structures, with a vertex angle ranging from 70° to 100°.

7. The optical composite film according to claim 6, characterized in that: The top angle is a 90° structure.

8. The optical composite film according to claim 1, characterized in that: The prisms in the first prism layer (100) and the second prism layer (400) are made by transfer printing using ultraviolet light curing glue, and the refractive index of the ultraviolet light curing glue is in the range of 1.5 to 1.

7.

9. The optical composite film according to claim 1, characterized in that: The prism portion in the second prism layer (400) is embedded in the haze matching layer (300).

10. A display device, characterized in that: The optical composite film comprises the optical composite film as claimed in any one of claims 1 to 9.

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