Optical film having lenticular structure

Abstract

The application relates to an optical film with a microlens structure, comprising a substrate layer and a microlens structure formed thereon. The microlens structure is a circular convex bump as a whole, has a conical protrusion in the center, and has a cross section in the shape of a combination of a triangle and a semicircle arc. The cross section of the conical protrusion is an isosceles triangle, so that light convergence is optimized, light scattering and light energy loss are reduced, optical gain effect is improved, optical uniformity and brightness are balanced, and light of different incident angles is adapted. The cross section of the circular convex bump is an ellipse or a semicircle, the front projection of the conical protrusion is a circle, the junction of the conical protrusion and the circular convex bump is a continuous surface, brightness is improved, and stress is dispersed. The top end of the conical protrusion is a round corner, wear resistance is optimized, stress concentration is reduced, the conical protrusions are closely arranged to increase light capturing area, and uniform light distribution is realized. In addition, an anti-absorption back coating layer is arranged on the back of the substrate layer to prevent stacking adsorption between film pieces. The microlens structure optical film can also be matched with a brightness enhancement film to make a bonded microlens brightness enhancement film.

Description

Technical Field

[0001] This application relates to the field of optical film technology, and in particular to an optical film having a microlens structure. Background Technology

[0002] In today's display technology, the requirements for optical film performance in various display products are becoming increasingly stringent. As a key component for improving display effects, brightness enhancement films, particularly traditional microlens-type films, have made some progress in the field of optical films. Leveraging their unique microlens structure, they exhibit advantages such as high shielding and high diffusion. This characteristic allows microlens films to effectively reduce light leakage and improve image contrast and clarity in many applications, positively impacting display performance. However, the optical efficiency of microlens films still lags significantly behind that of prism-structured brightness enhancement films. Prism-structured brightness enhancement films, through their unique microstructure, can efficiently converge and directionally propagate light, thereby achieving higher optical gain and improving display brightness. Therefore, how to effectively improve the optical gain effect while retaining the core advantages of high shielding and high diffusion of microlens films has become a crucial challenge in the field of optical film technology. Current research and exploration focus on improvements in material selection, structural design, and manufacturing processes, but a comprehensive and mature solution has yet to be found.

[0003] Meanwhile, with the continuous emergence of new display technologies such as OLED, Mini-LED, and Micro-LED, brightness enhancement films are facing unprecedented opportunities and challenges. New display technologies place higher demands on the optical performance, functional versatility, and cost control of brightness enhancement films. Market demand for display products continues to upgrade, requiring not only higher brightness and better color performance, but also continuous improvement in the optical effects of existing optical films to meet increasingly diverse market needs.

[0004] Microlens films, as an important type of brightness enhancement product for displays, have advantages over prism sheets in terms of shielding and scratch resistance. Good shielding effectively prevents light scattering and interference, improving image clarity and depth; excellent scratch resistance ensures the stability and reliability of the film during long-term use, reducing the risk of display quality degradation due to surface scratches. Therefore, it is necessary to optimize the composite microlens structure to overcome the limitations of traditional microlens films in terms of optical gain, enabling the product to achieve improved optical gain while retaining high shielding and high abrasion resistance. Utility Model Content

[0005] The purpose of this application is to provide a novel compound microlens structure design that, while retaining high shielding and high wear resistance, improves optical gain, overcoming the limitations of traditional microlens films in terms of optical gain. This objective is achieved through the following technical solution: The optical film with a microlens structure of this application includes a substrate layer and a microlens structure;

[0006] The microlens structure is formed on the substrate layer;

[0007] The microlens structure has a three-dimensional convex hull with a conical protrusion in the center.

[0008] The cross-sectional shape of the microlens structure is a combination of a triangle and a semicircle.

[0009] In one embodiment, the cross-section of the conical protrusion is an isosceles triangle, and the vertex angle of the isosceles triangle is in the range of 80° to 150°.

[0010] In one embodiment, the cross-section of the circular convex hull is an ellipse or a semicircle, and the diameter of the circle projected from the front is in the range of 10 μm to 100 μm.

[0011] In one embodiment, the frontal projection of the conical protrusion is a circle, and the diameter within the frontal projection of the circular protrusion is in the range of 5 μm to 50 μm.

[0012] In one embodiment, the junction between the conical protrusion and the circular bulge is a continuous surface.

[0013] In one embodiment, the tip of the conical protrusion is rounded.

[0014] In one embodiment, the microlens structure is arranged in a honeycomb pattern, a matrix pattern, or an irregular pattern.

[0015] In one embodiment, the microlens structures are arranged closely together.

[0016] In one embodiment, an anti-adsorption back coating is also included, which is formed on the back side of the substrate layer.

[0017] In one embodiment, a microlens structure optical film is combined with a lower brightness enhancement film to form a microlens prism composite brightness enhancement film.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] The optical film with a compound microlens structure proposed in this application maintains high shielding and high wear resistance, effectively overcoming the limitations of traditional microlens films in optical performance. The microlens structure integrates a circular convex hull and a central conical protrusion. This compound structure not only enhances the focusing ability of light, but also optimizes the light path. The circular convex hull and the central conical protrusion together can enhance the light converging ability, enabling the light to be concentrated and guided more efficiently, thereby improving the overall optical performance.

[0020] The microlens structure features a cross-sectional shape combining triangles and semicircles, optimizing light refraction and reflection while precisely controlling the light propagation path. The apex angle, ranging from 80° to 150°, can be adjusted to meet specific application requirements and achieve optimal optical performance. The diameter of the front-projected circle of the circular convex hull ranges from 10μm to 100μm, while the diameter of the front-projected circle of the conical convex bulge ranges from 5μm to 50μm. This ensures both the stability of the microlens structure and optimizes light focusing. By adjusting these two dimensional parameters, efficient convergence and guidance of light can be achieved, thereby enhancing optical gain.

[0021] The junction between the conical protrusion and the circular convex hull is a continuous surface, which helps reduce light scattering and reflection losses at the junction, improves light transmittance and utilization, and further enhances the optical gain effect. The rounded tip of the conical protrusion reduces stress concentration, improves the wear resistance of the microlens structure, and also reduces light scattering through a smooth transition, contributing to improved optical performance. In summary, the compound microlens structure design of this application improves the optical gain effect through structural optimization while maintaining high shielding and high wear resistance. Attached Figure Description

[0022] Figure 1 This is a schematic cross-sectional view of an optical film with a microlens structure in one embodiment of this application;

[0023] Figure 2 This is a top view schematic diagram of an optical film with a microlens structure in one embodiment of this application;

[0024] Figure 3 This is a top view schematic diagram of an optical film with a microlens structure in another embodiment of this application;

[0025] Figure 4 This is a top view schematic diagram of an optical film with a microlens structure in another embodiment of this application.

[0026] Explanation of reference numerals in the attached figures: 100, substrate layer; 200, microlens structure; 210, circular bulge; 220, conical protrusion. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0028] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] As a key optical component, the performance of optical films directly affects the display effect and user experience of various optical devices. With consumers' increasing demands for display quality, brightness, and contrast, traditional microlens films are gradually failing to meet the increasingly stringent application requirements in terms of optical gain, shielding properties, and abrasion resistance. This application provides a novel microlens structure 200 optical film aimed at improving optical performance. The following sections will elaborate on the specific design, construction, and advantages of this optical film with the microlens structure 200. Please refer to... Figures 1 to 4 As shown, in a preferred embodiment of this application, the optical film with a microlens structure 200 includes a substrate layer 100 and a microlens structure 200. The microlens structure 200 is formed on the substrate layer 100. The three-dimensional shape of the microlens structure is a circular convex hull 210 with a conical protrusion 220 in the center. The cross-sectional shape of the microlens structure 200 is a combination of a triangle and a semicircular arc.

[0031] The optical film with microlens structure 200 of this application is an optical element with unique optical performance and structural features. Its core components include a substrate layer 100 and a microlens structure 200 formed on the substrate layer 100. The microlens structure 200 is generally shaped like a circular convex hull 210, with a conical protrusion 220 located at the center of the circular convex hull 210. This complex structure optimizes the optical control capability of the optical film. Furthermore, in terms of cross-sectional shape, the cross-section of the microlens structure 200 is not a conventional shape, but rather a combination of a triangle and a semicircle. The complex design, including the circular convex hull 210 and the central conical protrusion 220, combined with the triangular and semicircular cross-sectional shape, allows for more effective focusing and convergence of light. When light is incident on the surface of the optical film, the circular convex 210 acts as a basic optical element to initially refract and converge the light, while the central conical convex 220 further converges and guides the light, allowing the light to pass through the optical film more concentratedly, reducing light scattering and loss, thereby improving the optical gain effect, making the light passing through the optical film brighter and stronger, and improving the overall performance of the optical system.

[0032] The combined triangular and semi-circular cross-sectional shape guides the propagation of light within the microlens structure 200. The triangular portion, with its specific angles and shape, refracts incident light in a regular manner, directing it in a predetermined direction. The semi-circular portion acts as a smooth transition and further converges the light, preventing abrupt changes and scattering during propagation. This precise control of the light propagation path allows for more orderly light transmission through the optical film, improving light utilization and reducing energy loss due to light scattering.

[0033] The three-dimensional structure of the circular convex hull 210 and the conical protrusion 220, along with the special cross-sectional shape design, enables the microlens structure 200 to maintain relatively stable optical performance under light incident at different angles and wavelengths. Due to the symmetry and regularity of the structural design, the propagation process of light within the microlens structure 200 is minimally affected, preventing significant fluctuations in optical performance due to minor changes in the incident angle or wavelength. This is crucial for the normal operation of the optical system under various environmental conditions, ensuring that the optical device consistently maintains stable display effects and optical performance.

[0034] In the optical film with microlens structure 200, the cross-sectional shape of the conical protrusion 220 corresponding to the central conical protrusion 220 of the microlens structure 200 is designed as an isosceles triangle. Through optical calculations and experimental verification, its angle range is controlled between 80° and 150° to achieve optimal performance of the optical film in different application scenarios. When the apex angle of the isosceles triangle is within the range of 80° to 150°, the conical protrusion 220 can more effectively converge the incident light. If the apex angle is too small, the refraction angle of the light on the cone surface changes too drastically, which may cause the light to be too concentrated in a very small area. This will not only increase the mutual interference between light rays, but may also cause diffraction and other adverse phenomena in the subsequent propagation of the light, reducing the utilization rate of the light. If the apex angle is too large, the converging effect of the cone on the light will be weakened, and efficient light concentration cannot be achieved. Controlling the apex angle within this range allows the light to be refracted more gently and effectively on the cone surface, converging the light to a suitable area, improving the optical gain effect, and enhancing the focusing ability of the optical film. Furthermore, it helps balance the optical uniformity and brightness of the optical film. When the apex angle is between 80° and 150°, the light, after being refracted by the conical protrusion 220, can form a relatively uniform light distribution on the surface of the optical film, avoiding local over-brightness or under-brightness, thereby ensuring the overall brightness and color uniformity of the displayed image. In practical applications, the angle at which light enters the optical film is diverse. The isosceles triangle apex angle range of 80° to 150° allows the conical protrusion 220 to better adapt to light with different incident angles. For a wide range of incident angles, the cross-section of the conical protrusion within this angle range can effectively refract and converge the light, reducing fluctuations in optical performance caused by changes in the incident angle.

[0035] From a manufacturing process perspective, controlling the vertex angle of the isosceles triangle within the range of 80° to 150° simplifies the manufacturing process of the microlens structure 200. With existing micro-nano fabrication technologies, precise processing and manufacturing can be achieved relatively easily, reducing the requirements for processing equipment and processes. Simultaneously, due to the reduced processing difficulty, the scrap rate during manufacturing will also decrease accordingly, thereby lowering production costs and enhancing the product's market competitiveness. This is of great significance for the large-scale production of optical films with the microlens structure 200 and can promote the widespread application of this technology in more fields.

[0036] In the optical film with microlens structure 200, the cross-sectional shape of the circular convex hull 210 within the microlens structure 200 is either elliptical or semi-circular. The diameter of the circle projected onto the optical film surface (i.e., the front side) by the circular convex hull 210 is controlled within the range of 10μm to 100μm. When the cross-section is semi-circular, the refraction and reflection of light on the convex hull surface are relatively regular, enabling more uniform convergence and diffusion of light, suitable for scenarios requiring high uniformity of light distribution, such as some display devices requiring uniform illumination. When the cross-section is elliptical, due to the different major and minor axes of the ellipse, the propagation characteristics of light in different directions will vary. This difference can be used for more precise deflection and focusing control of light. For example, in applications requiring enhanced light in a specific direction, the circular convex hull 210 with an elliptical cross-section can better meet the requirements. By adjusting the ratio of the major and minor axes of the ellipse, the propagation direction and convergence degree of light can be flexibly changed, thereby achieving the regulation of light propagation characteristics.

[0037] The circular convex hull 210, with a diameter ranging from 10μm to 100μm, can be well adapted to various sizes and types of optical systems. The tiny circular convex hull 210 can control light propagation, reducing light scattering and loss, thereby improving optical imaging quality. Within the 10μm to 100μm diameter range, the circular convex hull 210 effectively increases the incident area of ​​light, allowing more light to enter the microlens structure 200 and be controlled. The elliptical or semi-circular cross-sectional shape can guide light to undergo specific refraction and reflection within the microlens structure 200, reducing light reflection loss and scattering, and improving light transmittance and utilization. Furthermore, it offers high feasibility and stability in manufacturing processes. This size range is within the achievable range of existing micro-nano fabrication technologies, and existing molding and other processing techniques can accurately manufacture the required circular convex hull 210 structure. Moreover, the relatively stable size and shape design helps reduce errors and defect rates during manufacturing, improving product yield and consistency. Furthermore, this design facilitates the optimization and improvement of manufacturing processes to meet different production scales and cost requirements, providing a strong guarantee for the large-scale production and application of optical films.

[0038] In the optical film with microlens structure 200, the conical protrusion 220 at the center of the microlens structure 200 projects a standard circular shape on its front side in a direction perpendicular to the surface of the optical film. This circular projection is strictly within the front projection range of the circular protrusion 210. Simultaneously, the diameter of the front projection circle of the conical protrusion 220 is controlled within the range of 5μm to 50μm. The selection of this diameter range is based on optimization considerations for light focusing effect. If the diameter is too small (less than 5μm), the light-gathering effect of the conical protrusion 220 will be limited, potentially failing to effectively concentrate sufficient light, resulting in an insignificant optical gain effect. If the diameter is too large (greater than 50μm), the difference in the refraction angle of light on the conical surface will increase, easily causing aberrations and scattering phenomena, affecting the focusing quality of the light. Controlling the diameter within the range of 5μm to 50μm can ensure effective light convergence while reducing aberrations and scattering, enhancing the light-gathering effect, and improving the optical gain performance of the optical film.

[0039] Achieving Precise Optical Control: The diameter of the front-projected circular shape of the conical protrusions 220 of different sizes enables precise control of light at the microscopic level. Within the range of 5μm to 50μm, by adjusting the diameter of the conical protrusions 220, the refraction angle and propagation path of light within the microlens structure 200 can be altered. For example, a smaller diameter allows light to converge more strongly within a smaller area, suitable for applications requiring high-precision spot focusing, such as laser processing and optical storage; while a larger diameter allows for a relatively larger light-converging area and more uniform light distribution, suitable for display and lighting scenarios where high light uniformity is required. This precise optical control capability enables optical films with this microlens structure 200 to adapt to the needs of various complex optical systems, improving the performance and flexibility of optical systems.

[0040] Specifically, the junction of the conical protrusion 220 and the circular convex hull 210 is a continuous surface. This continuous surface design firstly enhances brightness, and secondly, it effectively disperses stress concentration caused by structural stress. When the structure is subjected to external loads, the stress is no longer concentrated at a single point or in a small area, but rather dispersed and transmitted along the specific geometric shape formed by the included angle. For example, when subjected to pressure perpendicular to the structural surface, the continuous surface geometry can decompose the pressure into components along the side of the conical protrusion and the outer surface of the circular convex hull 210, thereby reducing local stress levels, improving the overall load-bearing capacity and fatigue resistance of the structure, and extending its service life.

[0041] To optimize wear resistance, the conical protrusion 220 does not have a sharp tip; instead, the tip is specially designed to form a rounded corner structure. In traditional conical protrusion 220 structures with sharp tips, stress concentrates at the tip region under external loads, making this area a weak point in the structure and prone to fatigue failure or fracture. However, with the rounded corner, stress distribution is significantly improved. The smooth surface of the rounded corner evenly disperses stress into the surrounding material, preventing excessive stress concentration at the tip, thereby improving the load-bearing capacity and fatigue resistance of the conical protrusion 220 and its surrounding structure. When the structure is subjected to impact loads, the rounded corner tip acts as a buffer and disperses the impact force. The rounded corner, through its smooth surface, gradually transfers and disperses the impact force throughout the structure, reducing the magnitude of the impact force in a localized area and improving the structure's impact resistance. During product assembly, sharp tips may cause scratches or damage to surrounding components or operators. Rounded corner tips are safer and will not adversely affect the assembly process. In addition, rounded corners can reduce interference during assembly, making the assembly process smoother and improving assembly efficiency and quality.

[0042] Specifically, the microlens structure 200 is arranged in a honeycomb, matrix, or random pattern. The hexagonal honeycomb structure has the highest fill rate, fully utilizing the space on the carrier surface and arranging more microlens units within a limited area. This allows for higher optical performance integration on devices of the same size; for example, in display panels, more microlenses can enhance light convergence and diffusion, improving display brightness and contrast. Due to the high symmetry and periodicity of the honeycomb arrangement, light undergoes relatively uniform refraction and scattering when passing through the microlens array, helping to reduce optical distortion and aberrations and improve image quality. The close arrangement of hexagons provides mutual support between microlens units, enhancing the mechanical stability of the entire microlens array. The regularity of the matrix arrangement simplifies the design and manufacturing process of the microlens structure 200. During the optical design phase, the position and parameters of each microlens unit can be accurately calculated using mathematical models, facilitating the simulation and optimization of optical performance. During manufacturing, the matrix-arranged microlens structure 200 can be easily realized using micro-nano fabrication techniques such as photolithography and etching, ensuring high processing precision and consistency. The matrix arrangement can be easily expanded or reduced according to actual needs. By increasing or decreasing the number of rows and columns of microlens units, the size and optical performance of the microlens array can be adjusted to meet the needs of different scales and application scenarios. The irregularly arranged microlens structure 200 can break the optical performance limitations imposed by traditional regular arrangements, achieving some special optical functions. Because there is no fixed geometric relationship between the irregularly arranged microlens units, the propagation path of light passing through the microlens array is more complex and diverse. This complexity gives the microlens structure 200 a certain degree of resistance to external interference (such as light polarization, changes in incident angle, etc.), enabling it to maintain relatively stable optical performance under different environmental conditions. This scalability makes the matrix-arranged microlens structure 200 a promising candidate for applications in various optical devices and systems.

[0043] The microlens structures 200, located on a pre-defined bearing plane or the surface of a specific optical element, are not distributed in a loose, widely spaced manner, but rather arranged closely together. This close arrangement means that adjacent microlens structures 200 are as close as possible in space, with their edges almost seamlessly connected. The center-to-center distance between adjacent microlenses is controlled within an extremely small and precise range, typically less than a specific proportion of the microlens' own bottom diameter (e.g., less than 10%-30% of the bottom diameter; the specific proportion is determined comprehensively based on factors such as the microlens' design purpose, optical performance requirements, and manufacturing capabilities). From a macroscopic perspective, the microlens array presents a highly integrated and continuous appearance; from a microscopic perspective, each microlens unit strictly adheres to the rule of close arrangement, forming a tight and orderly layout with the surrounding microlenses. The closely packed microlens structure 200 increases the area for capturing incident light. When light strikes the surface of the microlens array, the close proximity of the microlenses reduces scattering and loss at the gaps between them, allowing more light to be captured and focused at the predetermined focal point. The closely packed microlens structure 200 also contributes to a more uniform light distribution. Each microlens independently refracts and modulates the light; through close packing, the optical effects between adjacent microlenses complement and coordinate each other, eliminating uneven light distribution and reducing bright spots and dark areas.

[0044] The overall product structure design also includes an anti-adsorption back coating layer, uniformly formed on the back side of the substrate layer 100. During the preparation process, a low-density particle coating can be used to avoid generating high haze and reduce the loss of incident light. The anti-adsorption back coating layer can maintain a certain space between itself and other stacked optical films by means of the added particles, thus avoiding the adsorption between multiple optical films.

[0045] Specifically, a lower brightness enhancement film can also be applied to the back of the substrate layer 100 to form a laminated microlens brightness enhancement film, thereby further improving the brightness output of the display device. Specific Implementation

[0047] The following will further introduce some specific implementation methods to provide a more detailed explanation of the technical solution of this application.

[0048] In Example 1, a microlens structure comprising a circular bulge and a conical protrusion is formed on a substrate layer. The conical protrusion has a cross-sectional angle of 80°, the circular bulge has a front-projected circular diameter of 100 μm, and the conical protrusion has a front-projected circular diameter of 50 μm. The tip of the conical protrusion is rounded. The interface between the circular bulge and the conical protrusion has an included angle.

[0049] In Example 2, the top of the conical protrusion is a sharp angle, and other technical features are consistent with those in Example 1.

[0050] In Embodiment 3, the junction between the conical protrusion and the circular convex hull is a continuous surface, and the top of the conical protrusion is a sharp angle. Other technical features are consistent with those in Embodiment 1.

[0051] In Example 4, the junction between the conical protrusion and the circular convex hull is a continuous surface, and other technical features are consistent with those in Example 1.

[0052] Comparative Example 1: In Comparative Example 1, the conical protrusion structure is not provided, but the technical features of other parts are consistent with those of Example 1.

[0053] The shielding properties, light uniformity, abrasion resistance, and brightness ratio of each embodiment were tested, and the relevant test results are shown in Table 1.

[0054] Table 1 shows the connection methods, vertex forms, and related test results for each embodiment.

[0055]

[0056] The above tests show that the brightness ratio of the technical solution using the microlens structure of this application can be significantly improved, indicating that any form of microlens structure in the technical solution of this application can improve the brightness ratio. Furthermore, when the apex corner of the microlens structure is rounded, the uniformity of light and wear resistance are improved, and the continuous surface connection method can further improve the brightness ratio.

[0057] As described above, this application provides an optical film with a microlens structure, including a substrate layer and a microlens structure formed thereon. The microlens structure is generally circular with a conical protrusion in the center, forming a compound structure. Its cross-section is a combination of triangles and semicircles. The cross-section of the circular protrusion is elliptical or semicircular, which facilitates light focusing and diffusion, reduces scattering and reflection losses, and improves light transmittance and utilization. Furthermore, the manufacturing process is highly feasible and stable. The junction between the conical protrusion and the circular protrusion is a continuous surface, which can disperse stress, improve structural load-bearing capacity and fatigue resistance, and extend service life. The top of the conical protrusion is specially treated to form rounded corners, improving stress distribution, enhancing load-bearing and impact resistance, reducing assembly interference, and ensuring safety and efficiency.

[0058] Controlling the apex angle of the isosceles triangle in the conical convex cross-section to between 80° and 150° simplifies the manufacturing process, reduces processing difficulty and scrap rate, lowers costs, enhances product competitiveness, and promotes widespread application of the technology. The microlens structure can be honeycomb, matrix, or randomly arranged. The microlens structures are closely arranged on the bearing plane or the surface of a specific optical element, with precise control over the center-to-center distance between adjacent microlenses, increasing the light-capturing area, reducing scattering and loss, and achieving uniform light distribution. The optical film with a microlens structure in this application, through unique structural design, rational arrangement, and optimized manufacturing process, achieves efficient light control, improves optical performance and stability, and simultaneously reduces production costs.

[0059] The above is only one specific implementation of this application, and any other improvements made based on the concept of this application shall be considered within the scope of protection of this application.

Claims

1. An optical film with a microlens structure, characterized in that, Including the substrate layer and microlens structure; The microlens structure is formed on the substrate layer; The microlens structure has a three-dimensional convex hull with a conical protrusion in the center. The cross-sectional shape of the microlens structure is a combination of a triangle and a semicircle.

2. The optical film with a microlens structure according to claim 1, characterized in that, The cross-section of the conical protrusion is an isosceles triangle, and the vertex angle of the isosceles triangle is in the range of 80° to 150°.

3. The optical film with a microlens structure according to claim 1, characterized in that, The cross-section of the circular convex hull is elliptical or semi-circular, and the diameter of the circle projected from the front is in the range of 10μm to 100μm.

4. The optical film with a microlens structure according to claim 3, characterized in that, The frontal projection of the conical protrusion is a circle, and the diameter within the frontal projection of the circular protrusion is in the range of 5μm to 50μm.

5. The optical film with a microlens structure according to claim 1, characterized in that, The junction between the conical protrusion and the circular convex hull is a continuous surface.

6. The optical film with a microlens structure according to claim 1, characterized in that, The top of the conical protrusion has rounded corners.

7. The optical film with a microlens structure according to claim 1, characterized in that, The microlens structure is arranged in a honeycomb pattern, a matrix pattern, or an irregular pattern.

8. The optical film with a microlens structure according to claim 7, characterized in that, The microlens structures are arranged closely together.

9. The optical film with a microlens structure according to claim 1, characterized in that, It also includes an anti-adsorption back coating, which is formed on the back side of the substrate layer.

10. The optical film with a microlens structure according to claim 1, characterized in that, An optical film is combined with a brightness enhancement film to form a microlens prism composite brightness enhancement film.

Images