Vehicle-mounted anti-reflection film
By designing an anti-reflective film with interlocking privacy and optical matching layers, the problem of driver visual interference caused by light reflection from in-vehicle touchscreens is solved, achieving good anti-reflective effects from different viewing angles and improving driving safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2026-04-03
AI Technical Summary
The light reflected from the in-vehicle touchscreen onto the windshield can obstruct the driver's view, especially in low light conditions, posing a significant safety hazard.
Design an automotive anti-reflective film that employs interleaved first and second privacy layers, including gratings extending in different directions with differentiated grating thickness and spacing, combined with an optical matching layer and a surface coating, to optimize the light propagation path and reduce reflected light.
It effectively disperses and guides light, reduces the intensity and amount of reflected light, improves driving safety, adapts to the light distribution needs under different viewing angles, and reduces the interference of reflected light on the driver's vision.
Smart Images
Figure CN224081841U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of automotive touch screens, and in particular to an automotive anti-reflective film. Background Technology
[0002] With rapid economic development and rising living standards, cars have become commonplace in households. For convenience and comfort, most users request touchscreens, also known as in-vehicle touchscreens, which primarily include navigation, center console, imaging, and entertainment systems. However, when an in-vehicle touchscreen is operating, the light emitted from the display module travels in all directions, creating reflections on the windshield that interfere with the driver's vision. These reflections are particularly pronounced at night, on cloudy days, or in poor lighting conditions, easily causing visual illusions and posing a significant safety hazard. Utility Model Content
[0003] To address the problem of light reflecting off existing in-vehicle displays onto the windshield and affecting the driver's vision, this application provides an in-vehicle anti-reflective film.
[0004] This application provides a vehicle-mounted anti-reflective film, which adopts the following technical solution:
[0005] A vehicle-mounted anti-reflective film includes a first direction, a second direction, and a third direction that intersect each other, and further includes:
[0006] substrate;
[0007] A privacy screen includes a first privacy screen and a second privacy screen. The first privacy screen covers a substrate, and the second privacy screen covers the first privacy screen. The first privacy screen includes a plurality of first gratings extending along a first direction, and the plurality of first gratings are spaced apart along a second direction. The second privacy screen includes a plurality of second gratings extending along a second direction, and the plurality of second gratings are spaced apart along the first direction.
[0008] Surface coating, covering the second privacy layer;
[0009] In this arrangement, the spacing between the middle of each first grating in the second direction is greater than the spacing at the edge, and adjacent second gratings are arranged at equal intervals.
[0010] By adopting the above technical solution, the thickness of the first grating and the second grating is 10-50 μm, the first grating and the second grating are inclined at 5-15° to the substrate, and the spacing between each second grating is 10-50 μm.
[0011] By adopting the above technical solution, the spacing between the first gratings on both sides of the first privacy layer is 10-20 μm, and the spacing between the first gratings in the middle of the first privacy layer is 20-30 μm.
[0012] By adopting the above technical solution, the cross-sections of both the first grating and the second grating are trapezoidal.
[0013] By adopting the above technical solution, there is a first light-transmitting part between two adjacent first gratings on both sides of the first privacy layer, and the light transmission angle of the first light-transmitting part is α, which satisfies: 25°≤α≤40°. There is a second light-transmitting part between the first gratings in the middle of the first privacy layer, and the light transmission angle of the second light-transmitting part is β, which satisfies: 40°<β≤60°.
[0014] By adopting the above technical solution, there is a third light-transmitting part between two adjacent second gratings, and the light transmission angle of the third light-transmitting part is θ, 40°<θ≤60°.
[0015] By adopting the above technical solution, a film layer is provided on the surface of the first light-transmitting part, the second light-transmitting part and the third light-transmitting part facing the substrate, and the film layer is made of silicon dioxide or magnesium fluoride.
[0016] By adopting the above technical solution, the vehicle anti-reflective film also includes an optical matching layer disposed between the substrate and the first privacy layer, wherein the refractive index of the optical matching layer is between the refractive index of the substrate and the refractive index of the first privacy layer.
[0017] By adopting the above technical solution, the surface coating includes a base layer, an intermediate layer and a top layer. The top layer is far away from the base layer relative to the intermediate layer. The base layer covers the second privacy layer. The base layer is an anti-reflective layer, the intermediate layer is a hydrophobic layer, and the top layer is a wear-resistant layer.
[0018] By adopting the above technical solution, the thickness of the substrate is 0.1 to 0.3 mm, the total thickness of the first privacy layer and the second privacy layer is 0.05 to 0.15 mm, and the thickness of the surface coating is 0.01 to 0.05 mm.
[0019] Compared with the prior art, this application includes at least one of the following beneficial technical effects:
[0020] 1. By setting a first grating and a second grating extending in different directions, a special optical structure is formed. This structure can effectively disperse and guide light, reducing concentrated reflection of light in a single direction. In particular, the design of the central spacing of the first grating being greater than the spacing on both sides makes the distribution of light in the center and on both sides more reasonable, enabling better control of the direction of light propagation and reducing the interference of reflected light on the driver's vision;
[0021] 2. The unique structural design allows the anti-reflective film to process light from multiple angles and directions, effectively reducing the intensity and amount of reflected light, thereby significantly reducing the interference of reflected light on the driver's vision and improving driving safety;
[0022] 3. The differentiated design of the two sides of the first privacy grating can better adapt to the light distribution requirements under different viewing angles. On the sides, the smaller spacing can more effectively block light and reduce lateral reflection; in the middle, the larger spacing helps to distribute light evenly and improves forward light transmission, thus achieving a good anti-reflection effect under different viewing angles. Attached Figure Description
[0023] Figure 1 This is an exploded view of the vehicle-mounted anti-reflective film in the embodiments of this application.
[0024] Figure 2 This is a top view of the privacy screen layer in an embodiment of this application.
[0025] Figure 3 This is an exploded view of the vehicle-mounted anti-reflective film in the embodiments of this application.
[0026] In the picture:
[0027] 1. Substrate; 2. Privacy shield; 3. Surface coating; 21. First privacy shield; 22. Second privacy shield; 23. First grating; 24. Second grating; 26. First light-transmitting part; 27. Second light-transmitting part; 28. Third light-transmitting part; X, first direction; Y, second direction; Z, third direction. Detailed Implementation
[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.
[0030] To more clearly describe the technical solution, we define as follows: Figure 1 The first direction X, the second direction Z, and the third direction Y shown in the diagram are intersecting. Preferably, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. It can be understood that the first direction X, the second direction Y, and the third direction Z are not absolutely perpendicular to each other, but can be at a certain angle.
[0031] Specifically, refer to Figures 1 to 3This application provides an automotive anti-reflective film, which includes a substrate 1, a privacy layer 2, and a surface coating 3 arranged sequentially along a third direction Z. The privacy layer 2 covers the substrate 1, and the surface coating 3 covers the privacy layer 2. In this embodiment, the substrate 1 is preferably made of PET material, and an adhesive layer is provided between the substrate 1 and the privacy layer 2. Further, in this embodiment, the privacy layer 2 includes a first privacy layer 21 and a second privacy layer 22. The first privacy layer 21 covers the substrate 1, the second privacy layer 22 covers the first privacy layer 21, and the surface coating 3 covers the second privacy layer 22. The first privacy layer 21 includes a plurality of first gratings 23 extending along a first direction X, and the plurality of first gratings 23 are spaced apart along a second direction Y. The second privacy layer 22 includes a plurality of second gratings 24 extending along the second direction Y, and the plurality of second gratings 24 are spaced apart along the first direction X. The spacing in the middle of each first grating 23 is greater than the spacing on both sides, and adjacent second gratings 24 are arranged at equal intervals. By setting a first grating 23 and a second grating 24 extending in different directions, light can be effectively dispersed and guided, reducing concentrated reflection of light in a single direction. The design of the first grating 23 having a larger spacing in the middle than on both sides makes the distribution of light in the middle and on both sides more reasonable, better controlling the direction of light propagation and reducing the interference of reflected light on the driver's vision.
[0032] In some embodiments, the surface coating 3 includes a base layer, an intermediate layer, and a top layer, with the top layer being farther from the base layer than the intermediate layer. The base layer covers the second privacy layer 22. The base layer is an anti-reflective layer, the intermediate layer is a hydrophobic layer, and the top layer is a wear-resistant layer. In other embodiments, the surface coating 3 may include one or more of an anti-fingerprint coating, an anti-scratch coating, a hardened coating, and an anti-glare coating, which are not limited herein.
[0033] In this embodiment, the thickness of the substrate 1 is 0.1–0.3 mm, the total thickness of the first privacy layer 21 and the second privacy layer 22 is 0.05–0.15 mm, and the thickness of the surface coating 3 is 0.01–0.05 mm. Reasonably limiting the thickness of each layer helps to balance the optical performance, mechanical performance, and cost of the anti-reflective film. The substrate 1 serves as the supporting structure for the entire anti-reflective film. Its thickness of 0.1–0.3 mm provides sufficient mechanical strength to ensure the stability and durability of the anti-reflective film during use, without adding unnecessary weight and cost due to excessive thickness. The total thickness of the first privacy layer 21 and the second privacy layer 22 is within the range of 0.05–0.15 mm, which ensures the effective implementation of privacy and anti-reflective functions while maintaining a certain degree of flexibility for easy installation and adaptation to different shaped vehicle displays. The surface coating 3 has a thickness of 0.01–0.05 mm, which meets the requirements for anti-fingerprint, anti-scratch, and anti-glare functions without affecting light transmittance due to excessive thickness. It also helps control the overall thickness of the anti-reflective film, enabling it to better adapt to existing vehicle display structures and facilitate widespread application.
[0034] Furthermore, in some embodiments, the thickness of the first grating 23 and the second grating 24 is 10–50 μm, the first grating 23 and the second grating 24 are inclined at 5–15° to the substrate 1, and the spacing between each second grating 24 is 10–50 μm. This ensures that the gratings effectively guide light without affecting light transmittance due to excessive thickness, or failing to achieve anti-reflective function due to excessive thinness. The tilt angle allows light to undergo a certain degree of refraction and scattering after entering the anti-reflective film, further reducing the generation of reflected light.
[0035] Specifically, the spacing between the first gratings 23 on both sides of the first privacy layer 21 is 10–20 μm, and the spacing between the first gratings 23 in the middle of the first privacy layer 21 is 20–30 μm. This differentiated design can better adapt to the light distribution requirements under different viewing angles. On both sides, the smaller spacing can more effectively block light and reduce lateral reflection; in the middle, the larger spacing helps to distribute light evenly and improves forward light transmittance, thus achieving a good anti-reflection effect under different viewing angles.
[0036] In some embodiments, both the first grating 23 and the second grating 24 have trapezoidal cross-sections. The trapezoidal cross-section design allows light to undergo multiple refractions and reflections upon entering the grating, thereby further reducing direct reflection. This structure is similar to a gradient refractive index design in optics, effectively guiding light along the slanted side of the grating, reducing direct reflection and improving the anti-reflection effect. In other embodiments, the cross-sections of the first grating 23 and the second grating 24 may also be rectangular or parallelogram-shaped, without limitation.
[0037] A first light-transmitting portion 26 is located between two adjacent first gratings 23 on both sides of the first privacy layer 21. The light transmission angle of the first light-transmitting portion 26 is α, satisfying: 25°≤α≤40°. A second light-transmitting portion 27 is located between the first gratings 23 in the middle of the first privacy layer 21. The light transmission angle of the second light-transmitting portion 27 is β, satisfying: 40°<β≤60°. This differentiated design can better adapt to the light distribution requirements under different viewing angles. A smaller light transmission angle α can effectively block side light and reduce side reflection; a larger light transmission angle β helps to evenly distribute light in the forward direction and improves forward light transmission, thus achieving a good anti-reflection effect under different viewing angles.
[0038] Furthermore, a third light-transmitting portion 28 is provided between two adjacent second gratings 24. The light transmission angle of the third light-transmitting portion 28 is θ, where 40° < θ ≤ 60°. This ensures a more uniform light distribution between the second gratings 24, avoiding uneven light distribution caused by excessively large or small light transmission angles. A reasonable light transmission angle can effectively reduce the generation of reflected light while ensuring sufficient light transmittance, thus improving the overall performance of the anti-reflective film.
[0039] In some embodiments, a film layer is provided on the surface of the first light-transmitting portion 26, the second light-transmitting portion 27, and the third light-transmitting portion 28 facing the substrate 1. The film layer is made of silicon dioxide or magnesium fluoride. Silicon dioxide and magnesium fluoride have good optical properties and chemical stability, which can effectively reduce the reflection of light in these areas. The low refractive index characteristics of silicon dioxide and magnesium fluoride can further optimize the light propagation path, reduce the generation of reflected light, and improve the anti-reflection effect.
[0040] The automotive anti-reflective film also includes an optical matching layer disposed between the substrate 1 and the first privacy layer 21. The refractive index of the optical matching layer is between that of the substrate 1 and the first privacy layer 21. By providing the optical matching layer, light reflection caused by the difference in refractive index between the substrate 1 and the first privacy layer 21 can be effectively reduced. When light enters the first privacy layer 21 from the substrate 1, without the optical matching layer, the light will be significantly reflected at the interface, causing some light to fail to effectively enter the privacy layer 2 and function. The presence of the optical matching layer makes the transition of light between the substrate 1 and the first privacy layer 21 smoother, allowing more light to enter the privacy layer 2 smoothly, thereby improving the overall optical performance of the anti-reflective film, further reducing the interference of reflected light on the driver's vision, and enhancing the display effect and visibility of the automotive display screen.
[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. An antireflection film for a vehicle, characterized by comprising: The vehicle-mounted anti-reflection film comprises a first direction (X), a second direction (Y) and a third direction (Z) intersecting with each other, and further comprises: a substrate (1); a privacy layer (2) comprising a first privacy layer (21) and a second privacy layer (22), the first privacy layer (21) is covered on the substrate (1), the second privacy layer (22) is covered on the first privacy layer (21), the first privacy layer (21) comprises a plurality of first gratings (23) extending along the first direction (X), and a plurality of the first gratings (23) are spaced apart along the second direction (Y); the second privacy layer (22) comprises a plurality of second gratings (24) extending along the second direction (Y), and a plurality of the second gratings (24) are spaced apart along the first direction (X); a surface coating layer (3) covered on the second privacy layer (22); wherein the pitch of each first grating (23) in the middle of the second direction (Y) is greater than that of the edge, and the adjacent two second gratings (24) are equidistantly arranged.
2. The anti-reflective film for vehicle according to claim 1, wherein: The thickness of the first grating (23) and the second grating (24) is 10-50μm, the first grating (23) and the second grating (24) are inclined to the substrate (1) by 5-15°, and the pitch between each second grating (24) is 10-50μm.
3. The anti-reflective film for vehicle according to claim 2, wherein: The pitch between the first gratings (23) on both sides of the first privacy layer (21) is 10-20μm, and the pitch between the first gratings (23) in the middle of the first privacy layer (21) is 20-30μm.
4. The anti-reflective film for vehicle according to claim 2, wherein: The cross section of the first grating (23) and the second grating (24) is trapezoidal.
5. The anti-reflective film for vehicle according to claim 2, wherein: The first privacy layer (21) has a first light transmission part (26) between the adjacent two first gratings (23) on both sides, the light transmission angle of the first light transmission part (26) is α, and 25°≤α≤40° is satisfied, and the first privacy layer (21) has a second light transmission part (27) between the first gratings (23) in the middle, the light transmission angle of the second light transmission part (27) is β, and 40°<β≤60° is satisfied.
6. The anti-reflective film for vehicle according to claim 5, wherein: The third light transmission part (28) between the adjacent two second gratings (24) has a third light transmission part (28), and the light transmission angle of the third light transmission part (28) is θ, and 40°<θ≤60° is satisfied.
7. The anti-reflective film for vehicle according to claim 6, wherein: The first light transmission part (26), the second light transmission part (27) and the third light transmission part (28) are provided with a film layer on the surface of the side of the substrate (1), and the film layer is made of silicon dioxide or magnesium fluoride.
8. The anti-reflective film for vehicle according to claim 1, wherein: The vehicle-mounted anti-reflection film further comprises an optical matching layer arranged between the substrate (1) and the first privacy layer (21), and the refractive index of the optical matching layer is between the refractive index of the substrate (1) and the refractive index of the first privacy layer (21).
9. The anti-reflective film for vehicle according to claim 1, wherein: The surface coating layer (3) comprises a bottom layer, an intermediate layer and a surface layer, the surface layer is away from the bottom layer relative to the intermediate layer, the bottom layer is covered on the second privacy layer (22), the bottom layer is an anti-reflection layer, the intermediate layer is a hydrophobic layer, and the surface layer is a wear-resistant layer.
10. The anti-reflective film for vehicle according to claim 1, wherein: The thickness of the substrate (1) is 0.1-0.3 mm, the total thickness of the first privacy layer (21) and the second privacy layer (22) is 0.05-0.15 mm, and the thickness of the surface coating layer (3) is 0.01-0.05 mm.