View angle expanding optical film and display device

Abstract

According to the technical scheme of the visual angle expanding optical film, on the premise that screen brightness is not sacrificed, the viewing effect of a display device at different angles is improved, a microstructure is provided with a flat top face and a complex side face form, each side face is composed of two or more inclined faces with different slopes, and therefore the visual angle expanding optical film is formed. The light is scattered in a wider direction through multiple reflections and refractions, so that the viewing angle range is expanded. Diffusion particles with refractive indexes different from those of microstructure materials are embedded in the microstructures and serve as secondary scattering sources of the light rays, the scattering effect of the light rays is further enhanced, and the light rays are distributed more evenly. Uniform distribution of light in the medium is promoted, and the definition and visual comfort of the medium are kept. The utility model further provides a display device comprising the display panel and the visual angle expanding optical film, the problems that a traditional display device is limited in visual angle, color shifts, uneven in brightness and the like are solved, the consistent and high-quality display effect is achieved, and the visual experience is improved.

Description

Technical Field

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

[0002] In display technology, expanding viewing angles has become a key issue in improving user experience. Traditional display devices, such as liquid crystal displays (LCDs) and organic light-emitting diode displays (OLEDs), often face the problem of limited viewing angles. In particular, the viewing angle range is limited in the directions perpendicular and parallel to the display panel, typically only covering around 65°-70°. This greatly limits the comfort and clarity of users when viewing content at different angles.

[0003] A new technology currently being adopted by the industry is the incorporation of trapezoidal microstructures on or within display screens. By finely adjusting their slope, the path of light propagation is effectively altered, redirecting some of the light originally parallel to the screen outward, thereby expanding the optical viewing angle. This approach not only improves brightness uniformity and color saturation when the screen is viewed at an angle, but also enhances visual quality when viewed from the side.

[0004] However, although the trapezoidal microstructure has made some progress in expanding the viewing angle, its effect is still limited by the design of a single-layer structure. Specifically, due to the physical limitations of light when passing through the microstructure, especially the lack of flexibility in light control in the vertical and parallel directions, the final optical viewing angle expansion range is still relatively limited. Therefore, in the field of viewing angle expansion optical films and display devices, the key issues that still need to be solved include: how to design more efficient microstructures to achieve a wider range of optical viewing angle expansion, and how to control manufacturing costs and improve production efficiency while ensuring the display effect. Utility Model Content

[0005] The purpose of the present application is to provide a viewing angle-expanding optical film that can improve the width of the optical viewing angle in different directions while maintaining brightness, so that the image of the display screen can be seen more clearly at different angles. The viewing angle-expanding optical film of the present application includes a plurality of sequentially arranged microstructures, with a gap between two adjacent microstructures;

[0006] The microstructure includes a top surface and side surfaces, the top surface of the microstructure is a plane, and the side surfaces of the microstructure include more than two inclined surfaces with different slopes, including at least one inclined surface with an inclination angle in the range of 60-80° and another inclined surface with an inclination angle in the range of 50-70°.

[0007] In one embodiment, the two sides of the microstructure are symmetrically arranged.

[0008] In one embodiment, the microstructures are disposed on a substrate, and the microstructures are parallel to each other.

[0009] In one embodiment, the spacing length between the microstructures is in the range of 2-10 μm.

[0010] In one embodiment, the slope of the microstructure gradually increases from the center to both sides.

[0011] In one embodiment, the microstructure includes diffusion particles, and the particle size of the diffusion particles is in the range of 0.5-5 μm.

[0012] In one embodiment, the side surface of the microstructure consists of two inclined surfaces with different slopes.

[0013] In one embodiment, the outer side of one side surface is a first inclined surface, and the other inclined surface is a second inclined surface. The inclination angle of the first inclined surface is in the range of 60-80°, the inclination angle of the second inclined surface is in the range of 50-70°, and the inclination angle of the first inclined surface is greater than the inclination angle of the second inclined surface.

[0014] In one embodiment, the projection width of the first inclined surface is in the range of 1-5 μm, the projection width of the second inclined surface is in the range of 1-5 μm, and the width of the top surface of the microstructure is in the range of 1-5 μm.

[0015] In addition, the present application also provides a display device, including a display panel and the aforementioned viewing angle-expanding optical film.

[0016] Compared with the prior art, the present application has the following beneficial effects: the widening viewing angle optical film provided by the present application can improve the width of the optical viewing angle in different directions while maintaining the stability of the brightness. By adopting a plurality of microstructures arranged in sequence and containing a plurality of inclined surfaces with different slopes, the widening viewing angle optical film can more effectively regulate the propagation path of light, so that the light is evenly diverged in multiple directions, thereby expanding the range of optical viewing angle. Compared with the traditional single-layer structure processing method, the optical film of the present application can achieve a wider optical viewing angle in all directions. The present application further effectively avoids excessive scattering of light during propagation by precisely controlling the shape, size and arrangement of the microstructures, and reasonably selecting the refractive index difference between the diffusion particles and the microstructure materials, thereby ensuring the stability of the screen brightness and avoiding the problem of brightness reduction due to the expansion of the viewing angle. By adjusting parameters such as the spacing length between the microstructures, the slope of the microstructures, and the particle size of the diffusion particles, the accuracy of light regulation is further refined to achieve comprehensive optimization of the visual effect.

[0017] The present invention's viewing angle-expanding optical film offers a high degree of design flexibility, allowing the shape, size, and arrangement of the microstructures to be adjusted to meet specific needs, adapting to the demands of different display devices and application scenarios. For example, by adjusting the slope distribution of the microstructure's side surfaces, differentiated optimization for different viewing angles can be achieved, further enhancing the user experience and broadening the application range of display devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a single microstructure in an embodiment of the present application;

[0019] Figure 2 This is a schematic structural diagram of a viewing angle expansion optical film according to an embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of the specific structure of a single microstructure in an embodiment of the present application.

[0021] Description of reference numerals: 100, microstructure; 110, top surface; 120, side surface; 200, diffusion particles. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0024] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] The viewing angle-expanding optical film uses specially designed microstructures 100 to control the propagation path of light using optical principles, making the light diverge evenly in multiple directions, thereby significantly expanding the optical viewing angle range. To improve the viewing effect of display devices at different angles while maintaining brightness stability, this application proposes a new technical solution for a viewing angle-expanding optical film. Figures 1 to 3 As shown, a viewing angle-expanding optical film in a preferred embodiment of the present application is suitable for improving the breadth of the optical viewing angle in different directions while maintaining the brightness. Specifically, it includes a plurality of microstructures 100 arranged in sequence, and there is a gap between two adjacent microstructures 100. The microstructure 100 includes a top surface 110 and a side surface 120. The top surface 110 of the microstructure 100 is a plane, and the side surface 120 of the microstructure 100 includes more than two inclined surfaces with different slopes, including at least one inclined surface with an inclination angle in the range of 60-80° and an inclined surface with an inclination angle in the range of 50-70°. The microstructure 100 includes diffusion particles 200, and the material of the diffusion particles 200 has a different refractive index from the material of the microstructure 100.

[0026] The viewing angle-expanding optical film of the present application improves the width of the optical viewing angle when viewed from different directions without sacrificing the brightness of the screen. The microstructures 100 are spaced apart from each other and have the form of a flat top surface 110 and a complex side surface 120. The design of the side surface 120 is the key to the present application. It is composed of two or more inclined surfaces with different slopes. These inclined surfaces are arranged at specific angles and scatter light in a wider range of directions through multiple reflections and refractions, thereby expanding the viewing angle range. The combination of inclined surfaces with different slopes can guide the light to change its path multiple times inside the microstructure 100, so that the light is no longer limited to a single direction, but is evenly diverged in all directions, significantly improving the width of the viewing angle. By precisely controlling the angle and arrangement of the inclined surfaces, while enhancing the scattering effect, it can also effectively reduce the loss of light in the scattering process, maintain a high light utilization rate, and thus maintain the brightness level of the screen.

[0027] Diffusing particles 200 with a different refractive index than the material of the microstructure 100 are embedded within the microstructure 100. These particles act as a secondary scattering source for light, further enhancing the scattering effect of the light and making the light distribution more uniform. The introduction of the diffusing particles 200 also helps to balance the light intensity distribution in different directions, reducing visual color difference and uneven brightness. Through their unique scattering properties, the diffusing particles 200 make the light more evenly distributed within the microstructure 100 and after output, improving the overall consistency of the picture and viewing comfort. Complementing the bevel design of the microstructure 100, the diffusing particles 200 further broaden the scattering range of light, allowing the optical film to achieve a high level of viewing effect at different angles.

[0028] Specifically, the two side surfaces 120 of the microstructure 100 are symmetrically arranged, and each microstructure 100 exhibits a high degree of geometric symmetry, with its two main side surfaces 120 showing a mirror-symmetrical relationship with the central axis of the microstructure 100 as a reference. This ensures that when light passes through the microstructure 100, it can be reflected and refracted along a symmetrical path, thereby achieving uniform distribution and effective diffusion of light. The symmetrical side surface 120 design makes the scattering of light in all directions more balanced, avoids the uneven viewing angle caused by the difference in the shape of the side surfaces 120, and helps to improve the viewing consistency of the display device at different angles. The symmetrical side surface 120 structure helps to reduce the ineffective scattering and reflection of light inside the microstructure 100, reduces light loss, and thus improves light utilization efficiency, which is of great significance for maintaining high brightness of the screen and reducing energy consumption. In addition, the symmetrical design simplifies the manufacturing process of the microstructure 100, reduces production difficulty and cost, and during the manufacturing process, it is only necessary to ensure that the shape of the side surface 120 on one side is correct, and the other side can be quickly completed by mirror copying, thereby improving production efficiency and yield rate.

[0029] To enhance the overall stability and repeatability of the microstructures 100, the microstructures 100 are arranged on a substrate in a parallel pattern. This promotes uniformity in the substrate's surface properties, facilitating uniformity in the subsequent deposition, attachment, or reaction of functional materials. The parallel and uniform layout of the microstructures 100 provides a larger effective surface area, which is beneficial for improving surface reaction efficiency and enhancing optical properties (such as reflection, transmission, and scattering). This design facilitates precise manufacturing using advanced micro-nanofabrication technologies, ensuring high precision and consistency of the microstructures 100. This enables large-scale production of micro-nanostructures with identical performance, reducing production costs and improving production efficiency.

[0030] Specifically, the spacing length between the microstructures 100 is within a range of 2-10 μm. By adjusting the spacing length between the microstructures 100 within a range of 2-10 μm, the behavior of light on the surface of the microstructure 100 can be precisely controlled, thereby customizing surface functional properties to meet the needs of different applications. Achieving appropriate spacing can achieve light diffraction, interference, or light guiding effects. In addition, the appropriate spacing length can improve the interface compatibility between the microstructure 100 and the covering material, allowing the material to more evenly fill or coat the surface of the microstructure 100, enhancing the overall strength and durability of the structure.

[0031] Specifically, the slope of the microstructure 100 gradually increases from the center to the sides, or the spacing of the microstructures 100 gradually increases from the center to the sides. These two approaches eliminate the difference between the center and the edges of the display area. A display panel designed with a gradient microstructure 100 can eliminate visual differences caused by angular differences between different areas through slight changes in the microstructure 100, thereby improving uniformity. In a further optimized technical solution, the slopes on both sides of the microstructure 100 change in opposite directions. From one side to the other (which can be referred to as the first direction), the slope of the slope on one side 120 gradually decreases, while the slope of the slope on the other side 120 gradually increases. Typically, when the direction perpendicular to the slope of the side 120 has a component in the first direction, the slope of the side 120 of each microstructure 100 gradually decreases in the first direction. Of course, the relevant rate of change varies depending on the size of the display area and viewing position. Typically, the rate of change of the slope of adjacent microstructures 100 is between 1% and 5%, enabling fine-tuning within a small range.

[0032] Specifically, the particle size of the diffusion particles 200 is in the range of 0.5-5 μm. Within this particle size range, the diffusion particles 200 can not only effectively promote the uniform distribution of light in the medium and reduce the spot effect, but also maintain the clarity and visual comfort of the medium, and avoid the problem of excessive scattering caused by excessively large particles or agglomeration caused by too small particles. Setting the particle size of the diffusion particles 200 between 0.5-5 μm helps to scatter light efficiently and evenly inside the medium, thereby improving the coverage of the light source and the softness of the light. The appropriate particle size range helps to reduce the glare and glare caused by direct light exposure, and improves the visual comfort of the product. Although the diffusion particles 200 are added, by precisely controlling the particle size within a smaller range, the absorption and blocking of light by the particles can be minimized, thereby maintaining the high transparency of the medium.

[0033] Specifically, the side surface 120 of the microstructure 100 is composed of two inclined planes with different slopes. These two inclined planes not only contribute to the manipulation of light independently, but the interaction between them further enhances the microstructure 100's ability to control light. By introducing two inclined planes with different slopes, the microstructure 100 can more flexibly adjust the propagation path and direction of light. A steeper inclined plane may cause a larger deflection of light, while a gentler inclined plane may cause light to be scattered or reflected at a gentler angle. This combination makes light management more refined and diversified. In addition, the formation of only the above two-layer structure can simplify the design and manufacturing process, and the parameters of the relevant models can be clear, which is conducive to directly making deterministic design changes in different scenarios without the need for repeated experiments.

[0034] Specifically, the outer side of one side surface 120 is a first inclined surface, and the other inclined surface is a second inclined surface. The inclination angle of the first inclined surface is within the range of 60-80 degrees ( Figure 3 The angle of the second inclined surface is in the range of 50-70° ( Figure 3 The angle of the first bevel is greater than the angle of the second bevel. In a side 120 structure, the portion adjacent to the outer edge is defined as the first bevel, while the opposing bevel is labeled the second bevel. The first bevel's angle is set between 60° and 80° to ensure it provides adequate guidance or support while maintaining structural stability. The second bevel's angle is between 50° and 70°. The second bevel may function differently from the first, providing smooth transitions or reducing stress concentration. This enhances the strength and stability of the structure on the outside (i.e., the side where the first bevel resides).

[0035] Specifically, the projected width of the first inclined surface is within a range of 1-5 μm, the projected width of the second inclined surface is within a range of 1-5 μm, and the width of the top surface 110 of the microstructure 100 is within a range of 1-5 μm. By controlling the projected widths of the first inclined surface, the second inclined surface, and the top surface 110 within a narrow range of 1-5 microns, the manufacturing accuracy and batch-to-batch consistency of the microstructure 100 can be significantly improved. By precisely controlling the widths of the inclined surface and the top surface 110, the optical performance of the microstructure 100 can be optimized, such as improving light capture efficiency, reducing scattering loss, or achieving a specific spectral response.

[0036] In addition, the present application also provides a display device, including a display panel and the aforementioned widening viewing angle optical film. The display device covers a high-performance display panel, which incorporates the widening viewing angle optical film of the present application, and solves the problems of traditional display devices in terms of limited viewing angle, color shift and uneven brightness through technical means. The application of the widening viewing angle optical film, through its microstructure 100 design and optical properties, can effectively widen the viewing angle range of the display device. Whether it is viewed from the front or from the side 120, you can enjoy a consistent and high-quality display effect. The widening viewing angle optical film can reduce the refraction and scattering of light at different viewing angles, thereby maintaining the consistency of color at different viewing angles, avoiding color shift or distortion, and ensuring that the display device can present accurate and rich colors in different environments, thereby enhancing the realism of the visual experience. By precisely controlling the structural parameters of the widening viewing angle optical film, the distribution of light on the screen can be further optimized and the phenomenon of uneven brightness can be reduced.

[0037] Specific implementation methods, the following introduces some specific implementation methods, further explains the technical solution of the present application through relevant specific examples, and compares the relevant performances. The technical effect of the technical solution of the present application is reflected by comparing the 1 / 2 brightness viewing angle and the brightness of the penetrating light between different embodiments and the comparative examples, and the brightness percentage is based on the brightness of Example 1. Test method: 1 / 2 viewing angle in the vertical direction: the point where the brightness in the vertical direction drops to 1 / 2 of the center brightness is the 1 / 2 viewing angle in the vertical direction. 1 / 2 viewing angle in the parallel direction: the point where the brightness in the parallel direction drops to 1 / 2 of the center brightness is the 1 / 2 viewing angle in the parallel direction. Brightness: Use BM-7 to measure the brightness of the center position of the backlight source. Angle brightness line graph: The brightness is measured from -90° to 90° in a certain direction, and the angle brightness line graph is finally obtained.

[0038] In Example 1, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 5 μm.

[0039] In Example 2, the projection width of the first inclined surface area A1 of the microstructure is 1 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 5 μm.

[0040] In Example 3, the projection width of the first inclined surface area A1 of the microstructure is 5 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 5 μm.

[0041] In Example 4, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 1 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 5 μm.

[0042] In Example 5, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 5 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 5 μm.

[0043] In Example 6, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 1 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 5 μm.

[0044] In Example 7, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 5 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 5 μm.

[0045] In Example 8, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 60°, the inclination angle 1 of the first inclined surface of the microstructure is 50°, and the interval length between adjacent microstructures is 5 μm.

[0046] In Example 9, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 80°, the inclination angle 1 of the first inclined surface of the microstructure is 70°, and the interval length between adjacent microstructures is 5 μm.

[0047] In comparative example 1, no particles are added, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 5 μm.

[0048] In comparative example 2, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 0 μm.

[0049] In comparative example 3, the projection width of the first inclined surface area A1 of the microstructure is 2 μm, the projection width of the second inclined surface area A2 of the microstructure is 2 μm, the width of the microstructure plane area B is 2 μm, the inclination angle 1 of the first inclined surface of the microstructure is 70°, the inclination angle 1 of the first inclined surface of the microstructure is 60°, and the interval length between adjacent microstructures is 15 μm.

[0050] The microstructured coating materials of Examples 1-9 and Comparative Examples 2-3 all contained 15% PMMA particles with a particle size of 3 μm. Comparative Example 1 did not contain any added particles.

[0051] The following table summarizes the test results of various implementation plans, including tests of 1 / 2 viewing angle in the vertical direction, 1 / 2 viewing angle in the parallel direction, brightness, and shielding.

[0052] Table 1 Specific implementation test results table

[0053]

[0054] From the above test results, it can be seen that compared with the comparative example 1 without the added particle microstructure, the solution of the present application has some loss of brightness, but it can be maintained within 5%, and has a larger viewing angle, better shielding, better picture uniformity, and a softer viewing experience. That is, the technical solution of the present application utilizes different slope structures of different inclined surfaces to effectively concentrate light from two directions into the effective viewing angle range to maintain brightness, and the method of adding particles to the microstructure allows light to be scattered within the microstructure, which can further increase the effective viewing angle and at the same time have better shielding and more uniform picture. Since comparative example 2 does not have a microstructure spacing, its viewing angle is narrower and its performance is poorer. Comparative example 3 has an excessively large microstructure spacing. Although its viewing angle can be maintained, its brightness performance is poorer.

[0055] As can be seen from the foregoing, this application proposes a technical solution for an optical film with an expanded viewing angle, which improves the viewing effect of a display device at different angles without sacrificing screen brightness. This optical film is achieved by providing specially designed microstructures. These microstructures are arranged in sequence and maintained at intervals. Each microstructure has a flat top surface and side surfaces. The side surfaces are composed of two or more inclined surfaces with different slopes. These inclined surfaces are arranged at specific angles and use multiple reflections and refractions to scatter light in a wider range of directions, thereby expanding the viewing angle range. Diffusing particles with a different refractive index from the microstructure material are also embedded in the microstructure as a secondary scattering source of light, further enhancing the scattering effect of light and making the light distribution more uniform.

[0056] The symmetrical arrangement of the two sides of the microstructure ensures that light is reflected and refracted along symmetrical paths as it passes through the microstructure, achieving uniform distribution and effective diffusion of light. Furthermore, the microstructures are arranged parallel to each other on the substrate, promoting the uniformity of the substrate's surface properties. By adjusting the interval length, slope, and spacing between the microstructures, a gradient design can be used to eliminate differences between the center and edge of the display area, improving uniformity. The particle size of the diffusion particles is in the range of 0.5-5μm, effectively promoting uniform distribution of light in the medium while maintaining the clarity and visual comfort of the medium.

[0057] The side of the microstructure consists of two inclined planes with different slopes. This design enhances the microstructure's ability to control light. The inclination angles and projected widths of the first and second inclined planes are both within a specific range, ensuring structural stability and optimizing optical performance. This application also provides a display device including a display panel and an optical film with an expanded viewing angle. This device solves the problems of traditional display devices such as limited viewing angle, color shift, and uneven brightness, and can present a consistent and high-quality display effect, enhancing the visual experience.

[0058] The above is only a specific implementation of the present application. Any other improvements made based on the concept of the present application are considered to be within the scope of protection of the present application.

Claims

1. An optical film with a widened viewing angle, characterized in that: It comprises a plurality of microstructures (100) arranged in sequence, with a gap between two adjacent microstructures (100); The microstructure (100) includes a top surface (110) and a side surface (120), wherein the top surface (110) of the microstructure (100) is a plane, and the side surface (120) of the microstructure (100) includes two or more inclined surfaces with different slopes, wherein at least one inclined surface has an inclined angle in the range of 60-80 degrees and another inclined surface has an inclined angle in the range of 50-70 degrees.

2. The viewing angle-expanding optical film according to claim 1, wherein: The two side surfaces (120) of the microstructure (100) are symmetrically arranged.

3. The viewing angle-expanding optical film according to claim 1, wherein: The microstructures (100) are arranged on a substrate, and the microstructures (100) are parallel to each other.

4. The viewing angle-expanding optical film according to claim 3, wherein: The spacing length between the microstructures (100) is in the range of 2-10 μm.

5. The viewing angle-expanding optical film according to claim 3, wherein: The slope of the microstructure (100) gradually increases from the center to both sides.

6. The viewing angle-expanding optical film according to claim 1, wherein: The microstructure (100) comprises diffusion particles (200), and the particle size of the diffusion particles (200) is within the range of 0.5-5 μm.

7. The viewing angle-expanding optical film according to claim 1, wherein: The side surface (120) of the microstructure (100) consists of two inclined surfaces with different slopes.

8. The viewing angle-expanding optical film according to claim 7, wherein: The outer side of one side surface (120) is a first inclined surface, and the other inclined surface is a second inclined surface. The inclination angle of the first inclined surface is within the range of 60-80 degrees, and the inclination angle of the second inclined surface is within the range of 50-70 degrees, and the inclination angle of the first inclined surface is greater than the inclination angle of the second inclined surface.

9. The viewing angle-expanding optical film according to claim 8, wherein: The projection width of the first inclined surface is within the range of 1-5 μm, the projection width of the second inclined surface is within the range of 1-5 μm, and the width of the top surface (110) of the microstructure (100) is within the range of 1-5 μm.

10. A display device, characterized in that: The invention comprises a display panel and the viewing angle-expanding optical film according to any one of claims 1 to 9.

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