Reflection assembly and head-up display system

Abstract

The utility model discloses a reflection assembly and a head-up display system, and the reflection assembly comprises a P light reflection film which can be disposed on the inner surface of a front windshield and is used for reflecting P light emitted by a projection assembly; the shadow eliminating glass comprises a glass body arranged on the inner surface of the P light reflecting film and a plurality of protruding structures arranged on the inner surface of the glass body, the protruding structures are provided with first surfaces, and the distance between the first surfaces and the inner surface of the glass body is gradually increased in the direction from the bottom to the top of the glass body. The reflection assembly and the head-up display system can eliminate ghosting in the head-up display system, and have the advantages of wide application range and low cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of head-up display systems, and in particular relates to a reflective component and a head-up display system. Background Art

[0002] At present, after years of development, the head-up display system (also known as HUD or HUD system) has greatly improved the ghosting problem caused by reflective glass. People have greatly reduced the ghosting problem through solutions such as wedge-shaped glass and P-light reflective film. However, the most fundamental problem of solving ghosting has not yet been solved.

[0003] While wedge-shaped glass can effectively address the ghosting problem, it has several drawbacks. First, due to the nature of this method, the wedge-shaped film must be designed specifically for each HUD-equipped vehicle. Second, completely eliminating ghosting requires precise optics and wedge angles, significantly increasing costs. This method is only effective at narrow viewing angles.

[0004] P-light reflective film utilizes the characteristics of the Brewster angle to reduce the reflected light at the first interface between the light and the glass to near zero, thereby eliminating ghosting. This solution is much simpler than wedge-shaped glass. However, due to the properties of this method, namely that the incident angle of the light is only near the Brewster angle, the viewing area will become very narrow. In actual operation, this method still cannot completely eliminate ghosting. In addition, to correct the image distortion problem caused by the curved front windshield, the head-up display system usually matches the corresponding quadratic curved surface reflector in the projection component. This reflector has very strict precision requirements and is therefore expensive, increasing costs.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0006] The purpose of the utility model is to provide a reflective component and a head-up display system, which can eliminate ghosting in the head-up display system and have the advantages of wide application range and low cost.

[0007] In order to achieve the above-mentioned purpose, a specific embodiment of the present invention provides a technical solution as follows: a reflective component for use in a head-up display system, the reflective component comprising:

[0008] A P-light reflective film can be provided on the inner surface of the windshield to reflect the P-light emitted by the projection assembly;

[0009] The shadow-eliminating glass includes a glass body arranged on the inner surface of the P-light reflecting film, and a plurality of protruding structures arranged on the inner surface of the glass body. The protruding structures have a first surface, and the distance between the first surface and the inner surface of the glass body gradually increases from the bottom to the top of the glass body.

[0010] In one or more embodiments of the present invention, the angle α between the first surface and the inner surface of the glass body is 0.5-5°.

[0011] In one or more embodiments of the present invention, the protruding structure is a wedge-shaped structure, and the wedge-shaped structure includes a second surface disposed opposite to the first surface, and the second surface is connected to the inner surface of the glass body.

[0012] In one or more embodiments of the present invention, a plurality of the protruding structures are sequentially connected and arranged on the inner surface of the glass body.

[0013] In one or more embodiments of the present invention, the surface of the protruding structure is chemically etched to form a fog layer on the surface of the protruding structure.

[0014] In one or more embodiments of the present invention, the inner surface of the glass body where no protruding structures are provided is chemically etched to form a haze layer on the surface of the protruding structures.

[0015] In one or more embodiments of the present invention, the P-light reflective film includes a substrate layer, a hard coating layer, a silicon single layer, a nickel-chromium alloy layer and a silicon dioxide layer stacked in sequence, the substrate layer is connected to the inner surface of the windshield, and the silicon dioxide layer is connected to the glass body.

[0016] In one or more embodiments of the present invention, the P-light reflective film further includes an ink layer disposed on a side of the substrate layer facing away from the hard coating layer.

[0017] In one or more embodiments of the present invention, the P-light reflective film is bonded to the shadow-eliminating glass via an optical adhesive film.

[0018] A specific embodiment of the present invention further provides a head-up display system, comprising:

[0019] windshield;

[0020] The reflective assembly as described above is provided on the inner surface of the windshield;

[0021] The projection component is used to emit P light onto the reflection component.

[0022] Compared with the existing technology, the reflective component and head-up display system of the present invention move the P-light reflective film from the interlayer of the windshield to the inner surface of the windshield, and then affix a layer of shadow-eliminating glass to the inner surface of the P-light reflective film. The shadow-eliminating glass utilizes the Fresnel lens principle and is provided with a number of raised structures on its inner surface. The raised structure has a first surface. Along the direction from the bottom to the top of the glass body, the distance between the first surface and the inner surface of the glass body gradually increases. The raised structure changes the optical path of the reflected light generated by the projection component irradiating the inner surface of the glass body, avoiding its reflection into the user's line of sight, so that only the reflected light of the P-light reflective film appears in the user's line of sight, thereby solving the ghosting problem. In addition, since the reflective component of the present invention is attached to the windshield, there are no requirements for the shape and structure of the windshield, so it can be applied to the windshields of various models, without the need to customize the windshield, reducing costs and expanding the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a structural light path diagram of a head-up display system (without a raised structure in the annular glass) in an example of the present invention;

[0025] Figure 2 This is a structural optical path diagram of a head-up display system in an example of the present utility model;

[0026] Figure 3 This is a schematic structural diagram of a P light reflective film in an example of the present invention;

[0027] Figure 4 This is a schematic diagram of imaging of the head-up display system in Example 1 of the present utility model;

[0028] Figure 5 This is a schematic diagram of imaging of the head-up display system in comparative example 1 of the present invention.

[0029] Description of main reference numerals:

[0030] 1. Reflection component; 11. P-light reflection film; 111. Base material layer; 112. Hard coating layer; 113. Silicon single substance layer; 114. Nickel-chromium alloy layer; 115. Silicon dioxide layer; 116. Ink layer; 12. Shadow-eliminating glass; 121. Glass body; 122. Raised structure; 1221. First surface; 1222. Second surface; 2. Projection component; 3. Windshield. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0032] Ghosting occurs because the windshield has thickness. Two images of equal size but not overlapping will appear at the inner and outer reflection interfaces of the windshield, and the distance between the two images is positively correlated with the thickness of the glass. That is, the thinner the glass, the closer the two ghost images are, and the less likely they are to occur. Reducing the thickness of the windshield will greatly shorten the distance between the two images. However, the thickness of the windshield cannot be reduced indefinitely, which poses a challenge to the strength, toughness and other properties of the windshield, and will also greatly increase the difficulty of manufacturing, thereby increasing costs. The most important issue is safety. The thinner the glass, the greater the harm to the human body after it breaks. Therefore, there is a need to set a limit on the thickness of thin glass. The P light reflective film in the prior art is located in the middle of the windshield.

[0033] like Figure 2 As shown, a head-up display system in an example of the present invention includes a windshield 3, a reflective component 1 and a projection component 2, the reflective component 1 includes a P-light reflective film 11 and an anisotropic glass 12; the P-light reflective film 11 is arranged on the inner surface of the windshield 3, and is used to reflect the P-light emitted by the projection component; the anisotropic glass 12 includes a glass body 121 arranged on the inner surface of the P-light reflective film 11, and a plurality of protruding structures 122 arranged on the inner surface of the glass body 121, the protruding structure 122 having a first surface 1221, and the distance between the first surface 1221 and the inner surface of the glass body 121 gradually increases along the direction from the bottom to the top of the glass body 121.

[0034] It should be noted that the projection component 2 projects vehicle information and other information onto the reflection component 1, which is reflected into the user's field of vision through the P-light reflection film 11 in the reflection component 1, so that the user can obtain vehicle information at the position of the windshield 3. Among them, vehicle information may include time, vehicle speed, fuel consumption and other information. In the present utility model, the projection component 2 can be a common P-light machine on the market, that is, vehicle information and other information are projected onto the reflection component 1 in the form of P-light. The P-light reflection film 11 can also be a common P-light reflection film 11 on the market. P-light (Parallel light) is a type of linearly polarized light, and its electric field vibration direction is parallel to the incident plane. In optics, P-light and S-light are distinguished according to the polarization direction of light. The electric field vibration direction of S-light (Senkrecht, meaning vertical) is perpendicular to the incident plane.

[0035] It is understandable that if Figure 1 As shown, when the P light of the projection component 2 is transmitted to the shadow-eliminating glass 12, part of the P light will pass through the shadow-eliminating glass 12 to the P light reflecting film 11, and part of the P light will be reflected on the inner surface of the shadow-eliminating glass 12 into the user's line of sight. The light reflected from the inner surface of the shadow-eliminating glass 12 is the source of the ghosting.

[0036] To eliminate this situation, Figure 2 As shown, the distance between the first surface 1221 of the raised structure 122 in the anoblique glass 12 and the inner surface of the glass body 121 gradually increases from the bottom to the top. This changes the path of light reflected from the inner surface of the anoblique glass 12, preventing it from being reflected into the user's field of view. The reflection angle i2 in the figure is significantly different from the emission angle i6, thus eliminating ghosting.

[0037] As shown in the figure, in a specific application scenario, assuming that the refractive index of the annular glass 12 is n and the refractive index of air is 1, the following relationship can be derived from the geometric relationship and the law of refraction:

[0038] i1=i2

[0039] sin i1=nsinθ

[0040] i3=θ+α=i4

[0041] i5=i4+α

[0042] sin i6=nsin i5

[0043] Thus we can conclude that:

[0044] sin i6=nsin(θ+2α)

[0045] sin i²=nsinθ

[0046] Obviously, i2 and i6 differ, and there is a functional relationship between them and angle α (the angle α between the first surface 1221 and the inner surface of the glass body 121). Controlling angle α and incident angle i1 allows the light reflected from the first surface 1221 to be directed toward the loading platform (the vehicle's loading platform), while the light reflected from the P-light reflective film 11 is directed toward the driver's seat (i.e., within the user's field of view), ultimately eliminating ghosting.

[0047] Preferably, the angle α between the first surface 1221 and the inner surface of the glass body 121 is 0.5-5°.

[0048] Specifically, the raised structure 122 can be considered a wedge-shaped structure, comprising a second surface 1222 disposed opposite the first surface 1221. The second surface 1222 is connected to the inner surface of the glass body 121. The first surface 1221 can be considered the working surface of the raised structure 122. Specifically, the P-light emitted by the projection assembly 2 enters through the first surface 1221, passes through the anaglyph glass 12, and reaches the P-light reflective film 11. The light reflected by the P-light reflective film 11 then exits through the first surface 1221. This is also the primary structure for eliminating ghosting. The angle α is the angle between the first surface 1221 and the second surface 1222.

[0049] Preferably, the raised structures 122 and the glass body 121 in the shadow-eliminating glass 12 are an integrated structure. For example, glass of conventional thickness is processed so that one surface of the glass has several raised structures 122 as shown in the figure, thereby obtaining the shadow-eliminating glass 12.

[0050] Preferably, a plurality of protrusion structures 122 are sequentially connected and arranged on the inner surface of the glass body 121 . This arrangement allows the P light emitted by the projection assembly 2 to pass through the first surface 1221 as much as possible before being incident on the P light reflective film 11 .

[0051] From the driver's (user's) perspective, the area below the windshield 3 generally shows the front cover of the vehicle rather than road information. Therefore, the reflective assembly 1 of the present invention can be attached to the bottom of the windshield 3, that is, the idle area below the windshield 3 is utilized without affecting the driver's viewing of road information from the middle of the windshield 3.

[0052] Since the raised structure 122 in the shadow-eliminating glass 12 can concentrate the direction of light, when the external sunlight is strong, the reflective component will also reflect the light from the loading platform above the dashboard into the human eye, thereby affecting the driving experience. Therefore, the surface of the raised structure 122 is chemically etched to form a fog layer on the surface of the raised structure 122.

[0053] In one or more embodiments of the present invention, the inner surface of the glass body 121 where the protrusions 122 are not provided is chemically etched to form a haze layer on the surface of the protrusions 122. This creates a certain degree of haze on the inner surface of the anodizing glass 12, thereby eliminating the effects of light beams and reflected light.

[0054] Chemical etching is a common method of etching the glass surface using chemical solutions. For example, the content of dissolved salt components in the etching solution is 0.1% to 1%. Dissolved salt components include H2SO4, HCl, HNO3, etc.

[0055] like Figure 3 As shown in a specific example, the P-type light reflective film 11 includes a substrate layer 111, a hard coating layer 112, a silicon single-element layer 113, a nickel-chromium alloy layer 114, and a silicon dioxide layer 115, which are stacked in sequence. The substrate layer 111 is connected to the inner surface of the windshield 3, and the silicon dioxide layer 115 is connected to the glass body 121. Each layer of the P-type light reflective film 11 is made of common materials on the market. For example, the substrate layer 111 is PET (polyethylene terephthalate) substrate layer 111; the hard coating layer 112 can be formed by applying a CHT-X1 coating solution.

[0056] The P-light reflecting film 11 can not only reflect P-light but also natural light, and has strong adaptability.

[0057] Furthermore, the P-light reflective film 11 also includes an ink layer 116 disposed on the side of the substrate layer 111 facing away from the hard coating layer 112. The ink layer 116 can function as a black printing layer, that is, the background of the light beam reflected by the P-light reflective film 11 seen by the user is black, making it easier for the user to clearly see the reflected imaging information of the P-light reflective film 11.

[0058] Specifically, the P light reflective film 11 is bonded to the shadow-eliminating glass 12 via an optical adhesive film. The P light reflective film 11 can also be bonded to the windshield 3 via an optical adhesive film. The optical adhesive film can be a commonly used adhesive film in the art, such as an OCA optical adhesive film.

[0059] The head-up display system of the present invention is described in detail below based on specific embodiments and comparative examples.

[0060] Example 1

[0061] The inner surface of 2mm thick glass was processed to form a glass body and several raised structures. Chemical etching (with a 0.1% H₂SO₄ etching solution) was then performed to produce the shadow-eliminating glass. A P-light reflective film was applied to the outer surface of the shadow-eliminating glass. Angle α was set to 0.5°, resulting in a reflective assembly.

[0062] Example 2

[0063] The inner surface of 2mm thick glass was processed to form a glass body and several raised structures. Chemical etching (with a 0.1% H₂SO₄ etching solution) was then performed to produce the shadow-eliminating glass. A P-light reflective film was applied to the outer surface of the shadow-eliminating glass. Angle α was set at 2°, resulting in a reflective assembly.

[0064] Example 3

[0065] The inner surface of 2mm thick glass is processed to form a glass body and several raised structures. Chemical etching (with a 0.5% H₂SO₄ etching solution) is then performed to produce the shadow-eliminating glass. A P-light reflective film is applied to the outer surface of the shadow-eliminating glass. Angle α is set to 0.5°, resulting in a reflective assembly.

[0066] Example 4

[0067] The inner surface of 2mm thick glass is processed to form a glass body and several raised structures. Chemical etching (with a 0.5% H₂SO₄ etching solution) is then performed to produce the shadow-eliminating glass. A P-light reflective film is applied to the outer surface of the shadow-eliminating glass. Angle α is set at 2°, resulting in a reflective assembly.

[0068] Comparative Example 1

[0069] A P light reflective film is applied to the inner surface of a glass having an actual thickness of 2 mm to obtain a reflective assembly.

[0070] The following tests were performed on the reflective assemblies in Examples 1 to 4 and Comparative Example 1, respectively.

[0071] (1) Transmittance or haze test: Use a haze meter to test. The test standard for the haze meter is ASTM D1003.

[0072] (2) Gloss and DOI value test at 60° incident angle: Use a gloss meter to test according to ISO 2813;

[0073] The data shown in the following table is obtained:

[0074] Transmittance / % Haze / % Glossiness (60°) / GU DOI value Example 1 94.89 5.21 76.12 91.37 Example 2 94.31 5.09 75.99 90.83 Example 3 93.89 12.01 55.64 71.79 Example 4 93.33 11.89 56.27 72.13 Comparative Example 1 95.44 0.77 88.93 97.89

[0075] The reflective components in Examples 1 to 4 and Comparative Example 1 were respectively attached to the inner surface of the windshield of a car, and the projection component was turned on. A tester sat in the driving position of the vehicle to observe the effect of the head-up display system.

[0076] The test results of Example 1 are as follows Figure 4 As shown: There is no ghosting and the image is very clear. Even when the sun is strong, the light from the stage is not reflected, and there is no Tyndall effect affecting the driver.

[0077] The test results of Examples 2 to 4 are substantially consistent with the test results of Example 1.

[0078] The test results of Comparative Example 1 are as follows Figure 5 As shown: The image has ghosting, and the distance between the two ghosting images is about 1.2mm, which affects the driving experience. The mirror image of the loading platform is very obvious, seriously affecting the driving experience and driving safety.

[0079] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0080] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A reflective component for use in a head-up display system, characterized in that: The reflective component comprises: A P-light reflective film can be provided on the inner surface of the windshield to reflect the P-light emitted by the projection assembly; The shadow-eliminating glass includes a glass body arranged on the inner surface of the P-light reflecting film, and a plurality of protruding structures arranged on the inner surface of the glass body. The protruding structures have a first surface, and the distance between the first surface and the inner surface of the glass body gradually increases from the bottom to the top of the glass body.

2. The reflective assembly according to claim 1, wherein: The included angle α between the first surface and the inner surface of the glass body is 0.5-5°.

3. The reflective assembly according to claim 2, characterized in that The protruding structure is a wedge-shaped structure, and the wedge-shaped structure includes a second surface disposed opposite to the first surface, and the second surface is connected to the inner surface of the glass body.

4. The reflective assembly according to claim 1, wherein: A plurality of the protruding structures are sequentially connected and arranged on the inner surface of the glass body.

5. The reflective assembly according to claim 1, wherein: The surface of the protruding structure is chemically etched to form a fog layer on the surface of the protruding structure.

6. The reflective assembly according to claim 1, characterized in that The inner surface of the glass body where no convex structure is provided is chemically etched to form a fog layer on the surface of the convex structure.

7. The reflective assembly according to claim 1, wherein: The P light reflective film includes a substrate layer, a hard coating layer, a silicon single substance layer, a nickel-chromium alloy layer and a silicon dioxide layer stacked in sequence. The substrate layer is connected to the inner surface of the windshield, and the silicon dioxide layer is connected to the glass body.

8. The reflective assembly according to claim 7, characterized in that: The P light reflective film further includes an ink layer disposed on a side of the substrate layer away from the hard coating layer.

9. The reflective assembly according to claim 1, wherein: The P light reflecting film is bonded to the shadow-eliminating glass via an optical adhesive film.

10. A head-up display system, characterized in that: include: windshield; The reflective assembly according to any one of claims 1 to 9, arranged on the inner surface of the windshield; The projection component is used to emit P light onto the reflection component.

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