Composite optical film

Abstract

The utility model discloses a composite optical film, which belongs to the technical field of optical films and comprises an optical film and a plurality of convex structures. The convex structure is located on the surface of the optical film and is provided with an asymmetric prism structure, and the design of the convex structure achieves precise orientation of light and optimization of optical performance. By adopting an advanced precision imprinting process, the composite optical film effectively combines multiple functions of brightness directional enhancement, stray light suppression, picture softness and the like. Excellent mechanical durability and long-acting stability are shown while excellent optical performance is guaranteed. The composite optical film is suitable for various high-end application scenes such as vehicle-mounted display, virtual reality and medical display, the visual experience quality is remarkably improved, and the composite optical film has wide application prospects and industrial value.

Description

Technical Field

[0001] This utility model belongs to the field of optical film technology, and in particular relates to a composite optical film. Background Technology

[0002] Rapid technological advancements have driven the evolution of digital electronic devices towards greater portability, higher brightness, and higher energy efficiency. This trend has fueled innovation in display technology, particularly in developing various solutions to enhance the performance of optical films in backlight systems, while prioritizing environmental protection and energy conservation.

[0003] As consumers' demands for display performance continue to rise, display technology has undergone significant changes. Liquid crystal displays (LCDs) have entered a mature stage, with backlight system performance playing a crucial role in display quality. Diverse application scenarios necessitate displays offering higher contrast ratios, wider color gamuts, and more uniform brightness distribution. Optical film technology has demonstrated significant value in meeting these demands, particularly in improving light efficiency and controlling light transmission.

[0004] Prism-shaped optical films play a crucial role in this process. Through precise structural design and optical engineering, these films effectively utilize the principles of light refraction and reflection to correct and guide the propagation of light. This type of film can effectively concentrate scattered light and recover light that might otherwise be lost, thereby significantly improving the light efficiency of the backlight module. Optimizing the film's materials and microstructure design not only enhances display brightness but also reduces overall energy consumption and heat output, thus improving the device's heat dissipation performance.

[0005] With the increasing prevalence of smart wearable devices, automotive displays, and large-size displays, the importance of optical films in various applications is becoming increasingly prominent. For these emerging markets, continuous innovation in optical film technology aims to meet higher performance requirements and user experience, driving the entire display industry towards greater efficiency and sustainability. Through continuous research and development of new technologies and improvements in manufacturing processes, optical film technology will occupy an important position in future display technologies, providing users with a superior visual experience. In some specific applications (such as automotive displays), besides the dashboard directly in front of the driver, other screens such as the center console or in front of the passenger seat are often not viewed directly, leading to a poorer driving experience (due to lower brightness). Traditional optical films typically employ a symmetrical triangular prism structure (θ1 = θ2). However, this design may have viewing angle limitations in certain specific application scenarios. Utility Model Content

[0006] This invention overcomes the shortcomings of the prior art by providing a composite optical film to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a composite optical film, comprising an optical film sheet and a plurality of protruding structures, wherein the protruding structures are located on the surface of the optical film sheet, the protruding structures are asymmetric prism structures, and the protruding structures form angles θ1 and θ2 with the optical film sheet, wherein the angle θ1 is 20° < θ1 < 60°, and the sum of the angles θ1 and θ2 is less than 120°.

[0008] In a preferred embodiment of this invention, the optical film is a PET substrate film or a pre-coated film.

[0009] In a preferred embodiment of this invention, the protrusions are uniformly distributed on the surface of the optical film.

[0010] In a preferred embodiment of this invention, the protruding structure is integrally formed with the optical film.

[0011] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0012] The composite optical film of this invention adopts an asymmetric prism structure, which, while meeting the brightness enhancement requirements of specific viewing angles, effectively balances brightness orientation, stray light control, and image softening functions through a precision imprinting process, exhibiting excellent optical performance and mechanical durability. It is suitable for applications of composite optical films in automotive, virtual reality, and medical fields. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0015] In the diagram: 10, optical film; 20, raised structure; 30, angle θ1; 40, angle θ2. Detailed Implementation

[0016] The following drawings will disclose several embodiments of this utility model. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these physical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0017] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0018] This embodiment provides a composite optical film that adopts an asymmetric prism structure. While meeting the brightness enhancement requirements of specific viewing angles, it effectively balances brightness orientation, stray light control, and image softening functions through a precision imprinting process, exhibiting excellent optical performance and mechanical durability. It is suitable for applications of composite optical films in automotive, virtual reality, and medical fields.

[0019] like Figure 1 As shown, the composite optical film of this embodiment includes an optical film 10 and several raised structures 20. The raised structures 20 are located on the surface of the optical film 10 and are asymmetrical prism structures. The raised structures 20 and the optical film 10 form angles θ130 and θ240, where θ130 is 20° < θ1 < 60° and the sum of θ130 and θ240 is less than 120°. The lower surface of the optical film 10 in this embodiment is provided with a matte treatment layer to improve the opacity, scratch resistance and image softening of the optical film 10. The haze of the matte treatment layer needs to be controlled within the range of 2% to 55%, with 5% to 35% being the optimal range, which can achieve a balance between light transmittance and light diffusion. It is suitable for light guiding, brightening and anti-glare applications. Such a matte treatment layer can also effectively cover up minor defects, improve the consistency of product appearance and service life. The optical film 10 in this embodiment is a PET substrate film or a pre-processed coating.

[0020] In this embodiment, the raised structures 20 are evenly distributed on the surface of the optical film 10. The raised structures 20 are integrally formed with the optical film 10. In this embodiment, a high-precision embossing roller is used to emboss the surface of the optical film 10 to form the raised structures 20.

[0021] In this embodiment, the advantage of the asymmetrical structure of the protruding structure 20 is that its bottom corner angle design is flexible and can accurately control the emission direction and distribution characteristics of light. By adjusting the angles θ130 and θ240, the optical film 10 can achieve the best brightness distribution and user visual experience.

[0022] In this embodiment, the angle θ130 is adjustable from 20° to 60°, and its design allows the main beam to be deflected towards a specific viewing direction, such as within the horizontal range of 35° to 45°. The main purpose of this adjustment strategy is to increase the relative brightness ratio within this range, reaching at least 25%, to ensure uniform brightness experience for oblique viewers. Thus, by fine-tuning the angle θ130, a uniform brightness distribution can be achieved across different viewing angles, thereby improving user viewing comfort. This design is particularly suitable for multi-angle public displays or multi-angle application scenarios.

[0023] Specifically, in this embodiment, the sum of angles θ240 and θ130 must not exceed 120° to further reduce stray light interference at large angles (e.g., 70°). This design ensures that the intensity of stray light is effectively suppressed over a large angle range, and the relative brightness ratio in the 70° direction is controlled to ≤9%. This design not only reduces the impact of stray light on image clarity but also provides a reasonable technical basis for improving display quality.

[0024] While the present invention has been described above with reference to various embodiments, it should be understood that many changes and modifications can be made without departing from the scope of the present invention. That is, the methods, systems, or devices discussed above are merely examples. Various configurations can be appropriately omitted, substituted, or added to various processes or components. For example, in alternative configurations, methods can be performed in a different order than described, and / or various stages can be added, omitted, and / or combined. Moreover, features described with respect to certain configurations can be combined in various other configurations. Different aspects and elements of the configuration can be combined in a similar manner. Furthermore, as technology develops, many elements are merely examples and do not limit the scope of this disclosure or the claims.

[0025] Specific details are provided in the specification to offer a thorough understanding of exemplary configurations, including implementations. However, configurations can be practiced without these specific details; for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail to avoid obscuring the configuration. This description provides only exemplary configurations and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes can be made to the function and arrangement of the elements without departing from the spirit or scope of this disclosure.

[0026] Furthermore, although each operation can be described as a sequential process, many operations can be executed in parallel or simultaneously. Additionally, the order of operations can be rearranged. A process may have additional steps. Moreover, examples of methods can be implemented using hardware, software, firmware, middleware, code, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware, or code, the program code or code segments used to perform the necessary tasks can be stored in a non-transitory computer-readable medium such as a storage medium and executed by a processor.

[0027] In summary, the above detailed description is intended to be exemplary rather than limiting, and it should be understood that the claims (including all equivalents) are intended to define the spirit and scope of this invention. These embodiments should be understood as illustrative only and not as limiting the scope of protection of this invention. After reading the description of this invention, those skilled in the art can make various alterations or modifications to it, and these equivalent changes and modifications also fall within the scope defined by the claims of this invention.

Claims

1. A composite optical film, characterized in that, It includes an optical film (10) and several protruding structures (20), the protruding structures (20) are located on the surface of the optical film (10), the protruding structures (20) are asymmetric prism structures, the protruding structures (20) and the optical film (10) form angles θ1 (30) and θ2 (40), the angle θ1 (30) is 20° < θ1 < 60°, and the sum of the angles θ1 (30) and θ2 (40) is less than 120°.

2. The composite optical film according to claim 1, characterized in that, The optical film (10) is a PET substrate film or a pre-coated film.

3. The composite optical film according to claim 1, characterized in that, The protruding structures (20) are uniformly distributed on the surface of the optical film (10).

4. The composite optical film according to claim 1, characterized in that, The protruding structure (20) is integrally formed with the optical film (10).

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