Optical diffusion film
By setting arc-shaped particle protrusions and introducing perovskite quantum dots on the surface of the light diffusion layer of the optical diffusion film, the organic combination of the light diffusion layer and the surface microstructure is achieved, solving the problems of light efficiency improvement and light source uniformity, and realizing a more efficient light field diffusion effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU XINXIN TAIJING TECH CO LTD
- Filing Date
- 2025-09-30
- Publication Date
- 2026-08-04
AI Technical Summary
In existing optical diffusion films, the light diffusion layer and the surface microstructure function independently, failing to form an integrated synergistic diffusion, resulting in limited improvement in light efficiency and poor light source uniformity.
An optical diffusion film is designed by setting arc-shaped or near-arc-shaped particle protrusions as surface microstructures on the surface of the light-emitting diffusion layer, and introducing perovskite quantum dots into the light-incident or light-emitting diffusion layer to form a composite structure to achieve the organic combination of the optical diffusion layer and the surface microstructure.
It significantly improves the uniformity and brightness of light diffusion, avoids the limitations of traditional microstructures that rely on mold imprinting, and improves light efficiency.
Smart Images
Figure CN224594863U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical display and lighting technology, and in particular to an optical diffusion film. Background Technology
[0002] Optical diffusion films are commonly used as structural components in display or lighting devices, such as in backlight modules or light guide assemblies, where they play a role in optical control. Their basic principle is to utilize the interface between media with different refractive indices, causing light emitted from a light source to be reflected, refracted, and scattered within and on the surface of the film, thereby homogenizing a point or line light source into a planar light source. In recent years, quantum dot optical diffusion films, as a novel functional film material, have been widely used in backlight module structures.
[0003] Existing technology, such as Chinese Patent No. CN218630256U, discloses an optical functional plate, which is composed of an incident light diffusion layer, a light-emitting layer, and an emitted light diffusion layer connected sequentially. Several non-interval microstructures are disposed on the surface of the emitted light diffusion layer away from the light-emitting layer. These microstructures are directly formed on the surface of the diffusion plate by die-printing, thereby improving the light diffusion effect and increasing the center brightness of the plate. Simultaneously, diffusion particles (diffusers) are added to both the incident and emitted light diffusion layers, and these diffusion particles (diffusers) are embedded into the layers through an extrusion composite molding process to achieve the light diffusion effect.
[0004] Although existing light diffusion films / plates mostly adopt a composite mode of "intra-layer diffusion + surface microstructure", the two functions are relatively independent and have failed to form an integrated synergistic diffusion mechanism at the structural design level, resulting in limited improvement in luminous efficiency. At the same time, the non-uniformity of the diffusion particle distribution can also cause local light field instability, affecting the homogenization effect of the light source.
[0005] Therefore, how to achieve an organic combination between the light diffusion layer and the surface microstructure in the structural design, and realize light field diffusion through the structured surface, has become a technical problem that urgently needs to be solved in this field. Utility Model Content
[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an optical diffusion film with a novel structure, so as to achieve the organic combination of optical diffusion layer and surface microstructure, thereby improving light efficiency.
[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution:
[0008] An optical diffusion film includes an incident light diffusion layer, a light transmission layer, and an outgoing light diffusion layer connected in sequence. The outgoing light diffusion layer has a surface microstructure on the side away from the light transmission layer. The surface microstructure is composed of multiple particle protrusions partially exposed on the outer surface of the outgoing light diffusion layer. The cross-section of the particle protrusions is arc-shaped or approximately arc-shaped.
[0009] Furthermore, perovskite quantum dots are distributed in the light-incident or light-outcrystal diffusion layer.
[0010] In summary, this invention has the following beneficial effects: By setting microstructures on the surface of the light-emitting diffusion layer and using diffusion particles directly as surface microstructures, this invention forms a composite structure of "surface protrusion scattering." This structure can utilize the hemispherical protrusions on the light-emitting surface to refract and scatter light at multiple angles, thereby significantly improving the uniformity of light diffusion. At the same time, it avoids the limitation of traditional microstructures that must rely on mold imprinting to achieve the microstructure. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the product structure of the optical diffusion film of this utility model.
[0012] Reference numerals: 1. Incident light diffusion layer; 2. Transmitting light layer; 3. Exit light diffusion layer; 4. Surface microstructure; 5. Particle; 6. First diffusing particle; 7. Second diffusing particle. Detailed Implementation
[0013] The present invention will be further described in detail below with reference to the accompanying drawings.
[0014] like Figure 1 As shown, an optical diffusion film includes an incident light diffusion layer 1, a light transmission layer 2, and an exit light diffusion layer 3 connected in sequence. The exit light diffusion layer 3 has a surface microstructure 4 on the side away from the light transmission layer 2. The surface microstructure 4 is composed of multiple particle protrusions 5 partially exposed on the outer surface of the exit light diffusion layer 3. The cross-section of the particle protrusions 5 is arc-shaped or approximately arc-shaped.
[0015] By forming arc-shaped or near-arc-shaped particle protrusions 5 on the outer surface of the light diffusion layer 3, not only can the refractive and scattering interfaces on the film surface be increased at the structural level, but the limitation of traditional microstructures that must rely on mold imprinting to achieve microstructures is also avoided. This patent achieves an organic combination between the light diffusion layer and the surface microstructure 4, realizing light field diffusion through the structured surface and improving light efficiency.
[0016] In the above, particle 5 is a diffusing particle. One end of the diffusing particle is exposed outside the light-emitting diffusion layer 3 and is hemispherical. Multiple hemispheres are continuously distributed on the surface of the light-emitting diffusion layer 3 to form a thin film surface microstructure 4. The diffusing particles protrude on the film surface in the form of hemispheres. The optical curvature of the hemispheres helps to improve brightness uniformity and enhance the light field diffusion effect.
[0017] In a preferred embodiment, the diffusing particles include at least two types of particles 5 with different particle sizes, and the at least two types of particles 5 correspond to the first diffusing particle 6 and the second diffusing particle 7, respectively.
[0018] The first diffusing particle 6 is exposed at one end of the light-emitting diffusing layer 3 in the form of a large hemisphere, and the second diffusing particle 7 is exposed at one end of the light-emitting diffusing layer 3 in the form of a small hemisphere.
[0019] Large and small hemispheres are randomly distributed or arrayed on the surface of the light-emitting diffusion layer 3 to form a thin film surface microstructure 4. By introducing hemispheres of different sizes on the same surface, multi-scale scattering effects can be generated at the structural level. The large hemispheres mainly achieve the refraction and diffusion of large-angle light, while the small hemispheres further diffuse fine light rays, making the light distribution on the panel more delicate and uniform, effectively reducing shadows and improving the overall light emission uniformity.
[0020] Furthermore, the particle size of the first diffusing particle 6 is 10-20 μm, and the particle size of the second diffusing particle 7 is 1-10 μm.
[0021] The light-emitting diffusion layer 3 has a thickness of 5-30 μm, so that one end of the diffused particles protrudes outward from the surface of the light-emitting diffusion layer 3 to form a surface microstructure 4.
[0022] By defining the thickness range of the light diffusion layer 3 and the particle size range of the first diffusion particle 6 and the second diffusion particle 7, some diffusion particles can stably form a protruding structure, avoiding excessive embedding in the light diffusion layer 1 or detachment. This results in a multi-layered scattering effect on the film surface.
[0023] In this application, the incident light diffusion layer 1, the light-transmitting layer 2, and the emitted light diffusion layer 3 are connected by an adhesive, making the optical diffusion film an integrated structure. The adhesive can be a UV-curable resin, a thermosetting resin, or the like, used to fix the diffusion particles.
[0024] Furthermore, the height of the protrusion of the particle 5 does not exceed 2 / 3 of its particle diameter. On the one hand, this ensures good contact surface and bonding strength between the particle 5 and the light-emitting diffusion layer 3; on the other hand, by limiting the height of the protrusion of the particle 5, the problem of easy scratching and damage to the film surface caused by excessive protrusion is avoided.
[0025] In this invention, the diffused particles are one or more of the following: inorganic oxides (e.g., silicon dioxide, titanium dioxide, etc.), organic polymers (PMMA, etc.), and glass microspheres.
[0026] Example 2
[0027] The difference from Example 1 is that the diffused particles include at least two types of particles 5 with different particle sizes, and the at least two types of particles 5 correspond to the first diffused particle 6 and the second diffused particle 7, respectively.
[0028] The first diffusing particle 6 is exposed at one end outside the light-emitting diffusion layer 3 in the form of a large hemisphere. The large hemispheres are randomly distributed or arrayed on the surface of the light-emitting diffusion layer 3 to form a thin film surface microstructure 4.
[0029] The second diffusing particle 7 is embedded inside the light-emitting diffusing layer 3 and is not exposed, so as to achieve in-layer diffusion.
[0030] This structure achieves a dual diffusion path on the light-emitting diffusion layer 3 by combining "surface microstructures 4 + internally embedded particles" in the same layer: the outer hemisphere is responsible for changing the emission direction and distribution of light, while the internal particles are responsible for scattering and diffusing the light. The two work together to effectively improve the light diffusion efficiency and light emission uniformity.
[0031] It should be noted that the optical diffusion film mentioned in the title of this application includes both films and plates. This difference in naming due to variations in flexibility should be covered by the scope of protection of this application and included in the explanation of the title of this application.
[0032] The specific embodiments are merely explanations of this utility model and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this utility model.
Claims
1. An optical diffusion film comprising, in order, a light-entering diffusion layer (1), a light-transmitting layer (2), and a light-exiting diffusion layer (3), characterized in that: The light-emitting diffusion layer (3) has a surface microstructure (4) on the side away from the light-transmitting layer (2). The surface microstructure (4) is composed of multiple particle (5) protrusions that are partially exposed on the outer surface of the light-emitting diffusion layer (3). The cross-section of the particle (5) protrusion is arc-shaped or approximately arc-shaped, and the height of the particle (5) protrusion does not exceed 2 / 3 of its particle diameter. The particle (5) is a diffusion particle, and the diffusion particle includes at least two kinds of particles (5) with different particle sizes, and the at least two kinds of particles (5) correspond to the first diffusion particle (6) and the second diffusion particle (7) respectively. The first diffusion particle (6) is in the form of a large hemisphere at one end exposed outside the light-emitting diffusion layer (3), and the second diffusion particle (7) is in the form of a small hemisphere at one end exposed outside the light-emitting diffusion layer (3). The large and small hemispheres are randomly distributed or arrayed on the surface of the light-emitting diffusion layer (3) to form a thin film surface microstructure (4).
2. The optical diffusion film according to claim 1, characterized in that: The particle size of the first diffusing particle (6) is 10-20 μm; The particle size of the second diffused particle (7) is 1-10 μm.
3. The optical diffusion film according to claim 1, wherein: The thickness of the light-emitting diffusion layer (3) is 5-30 μm, so that one end of the diffusion particle protrudes outward from the surface of the light-emitting diffusion layer (3) to form a surface microstructure (4).
4. The optical diffusion film according to claim 1, wherein: The light-incident diffusion layer (1), the light-transmitting layer (2), and the light-exit diffusion layer (3) are connected by an adhesive method, so that the optical diffusion film forms an integrated structure.