A projection type head-up display structure

Abstract

This utility model relates to the field of projection head-up display technology, specifically a projection head-up display structure. It includes a windshield (1), an adhesive layer (2), and flexible glass (3). The flexible glass (3) comprises a glass layer (4) and a coating layer (5). The flexible glass (3) is bonded to the windshield (1) via the adhesive layer (2). The radius of curvature of the flexible glass (3) and the surface curvature error of the windshield (1) are ≤0.3mm. The adhesive layer (2) is bonded to the inner surface of the glass layer (4) of the flexible glass (3), and the coating layer (5) is bonded to the outer surface of the glass layer (3). The projection head-up display structure of this utility model eliminates the need for a rear shell, reducing material and processing costs. It can cover the curved surfaces of windshields of different vehicle models and has advantages such as low processing and bonding difficulty, strong maintainability, and wide adaptability.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle head-up display technology, and more specifically, relates to a projection head-up display structure. Background Technology

[0002] PHUD (Projected Head-Up Display), as a projection-type head-up display, provides convenient display of vehicle information by projecting it onto a specific area within the driver's field of vision. Its core lies in the optical performance and installation feasibility of the reflective screen. In existing technologies, most solutions involve direct coating of the windshield, which has the following drawbacks: the windshield's curved surface is complex, making direct coating difficult (yield <60%), and the coating layer is easily affected by the glass forming process (e.g., high temperature causing film oxidation); the coating is integrally formed with the windshield, requiring complete replacement for later maintenance, resulting in high costs (single set replacement cost > 5000 RMB); the glass body is thick (typically > 3mm), which cannot meet the PHUD's requirement for a lightweight reflective surface. In summary, existing PHUD reflective screens mostly rely on a back shell for structural support, which has the following drawbacks: high cost: the back shell requires mold injection molding, with a single back shell cost > 50 RMB; poor adaptability: the curved surface of the back shell needs to be precisely matched with the windshield, leading to customized development for different vehicle models; complex maintenance: the back shell is fixed integrally with the glass layer, making it impossible to replace the reflective screen separately. Therefore, there is room for improvement in the structure of existing technologies.

[0003] Existing technology includes a head-up display system (publication number CN215219325U) comprising a head-up display host and a display screen. The head-up display host includes a projection imaging device for emitting excitation light, and the display screen includes two stacked glass layers and a doped nanocrystalline light-emitting layer. The doped nanocrystalline light-emitting layer can receive the excitation light emitted by the projection imaging device. The head-up display host emits excitation light that illuminates the doped nanocrystalline light-emitting layer, exciting the nanocrystalline light-emitting material to emit light. Because the light emission is in the form of excitation, the head-up display host can be installed in a more flexible location, has a wider display area, and displays richer content.

[0004] However, this technology does not address the technical issues and solutions of this application. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a projection head-up display structure that is simple in structure, can eliminate the back shell, reduces material and processing costs, can cover the curved surface of windshields of different car models, and has the advantages of low processing and bonding difficulty, strong maintainability, and wide adaptability, in order to address the shortcomings of the existing technology.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] This utility model is a projection head-up display structure, including a windshield, an adhesive layer, and flexible glass. The flexible glass includes a glass layer and a coating layer. The flexible glass is bonded to the windshield by the adhesive layer. The radius of curvature of the flexible glass and the surface curvature error of the windshield are ≤0.3mm. The adhesive layer is attached to the inner side of the glass layer of the flexible glass, and the coating layer is attached to the outer side of the glass layer.

[0008] The glass layer of the flexible glass is aluminosilicate glass, PC, PMMA, PET, TPU, or TPE.

[0009] The flexible glass is made of aluminosilicate glass or borosilicate glass.

[0010] The flexible glass has a glass layer thickness of 0.05-2.0 mm and a coating layer thickness of 80-150 nm. The adhesive layer thickness is 0.02-0.1 mm.

[0011] The adhesive layer is a peelable elastic adhesive layer, which includes a hot melt adhesive layer and a VHB tape layer.

[0012] The flexible glass has protruding serrated positioning bosses at the edge of the glass layer, with the highest point of the serrated positioning bosses having a height of 0.05-1.0 mm.

[0013] The coating layer has a p-light reflectance >10% and a s-light reflectance <40%; simultaneously, the s-light reflectance >10% and the p-light reflectance <40%.

[0014] The flexible glass has a radius of curvature R = 800-2000 mm.

[0015] The surface hardness of the glass layer is ≥6H.

[0016] The working principle and beneficial effects of this utility model are as follows:

[0017] The projection-type head-up display structure of this utility model involves directly bonding flexible glass to the corresponding position on the windshield via an adhesive layer. The flexible glass is pre-formed using a hot bending process, and its radius of curvature is pre-set according to the curvature of the windshield to ensure a reliable fit between the flexible glass's radius of curvature and the windshield's surface. The flexible glass includes a glass layer and a coating layer. The coating layer is formed on the outer surface of the glass using a PVD (Physical Vapor Deposition) process, ensuring reliable P-light reflectivity and S-light reflectivity. Furthermore, the flexible glass meets the impact resistance requirements: surface hardness ≥6H, suitable for vehicle vibration environments. During assembly, after the glass layer (glass substrate) is hot-bent and shaped, it undergoes PVD coating to form the coating layer. An adhesive layer is then applied to the inner surface of the glass layer. The glass layer is aligned with the windshield, pressure is applied for bonding, and the pressure holding time is controlled. This ultimately forms a projection-type head-up display structure reliably bonded to the windshield. The installation process is simple and cost-effective. Attached Figure Description

[0018] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0019] Figure 1 This is a schematic diagram of the projection-type head-up display screen structure described in this utility model;

[0020] Figure 2 This is a schematic diagram of the projection-type head-up display screen structure described in this utility model;

[0021] Figure 3 This is a partially enlarged structural diagram of the flexible glass in the projection head-up display screen structure of this utility model;

[0022] The labels in the attached diagram are as follows: 1. Windshield; 2. Adhesive layer; 3. Flexible glass; 4. Glass layer; 5. Coating layer. Detailed Implementation

[0023] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0024] As attached Figure 1 - Appendix Figure 3As shown, this utility model is a projection-type head-up display structure, including a windshield 1, an adhesive layer 2, and flexible glass 3. The flexible glass 3 includes a glass layer 4 and a coating layer 5. The flexible glass 3 is bonded to the windshield 1 by the adhesive layer 2. The radius of curvature of the flexible glass 3 and the surface curvature error of the windshield 1 are ≤0.3mm. The adhesive layer 2 is bonded to the inner surface of the glass layer 4 of the flexible glass 3, and the coating layer 5 is bonded to the outer surface of the glass layer 4. To address the shortcomings of the prior art, an improved technical solution is proposed. During structural installation, the flexible glass is directly bonded to the corresponding positions on the windshield via an adhesive layer. The flexible glass is pre-formed using a hot bending process (curvature radius R = 800-2000mm at room temperature). The curvature radius of the flexible glass is pre-set according to the windshield's surface curvature to ensure a reliable fit between the flexible glass's curvature radius and the windshield's surface. The flexible glass comprises a glass layer 4 and a coating layer 5. The coating layer is formed on the outer surface of the glass using a PVD (Physical Vapor Deposition) process, reliably ensuring both P-light reflectivity and S-light reflectivity. Furthermore, the flexible glass meets the impact resistance requirements: surface hardness ≥ 6H, satisfying the requirements of automotive vibration environments (10-2000Hz, 20g acceleration). During flexible glass assembly, the glass layer (glass substrate) is heat-bent and shaped, then coated with PVD to form a coating layer. An adhesive layer is then applied to the inner surface of the glass layer. The glass layer is aligned with the windshield, and a pressure of 0.3-0.5 MPa is applied for bonding, with a pressure holding time of 20-30 seconds. This ultimately forms a projection-type head-up display structure that reliably adheres to the windshield. The installation process is simple, reducing costs. The projection-type head-up display structure described in this invention is simple in structure, eliminates the need for a back cover, reduces material and processing costs, can cover the curved surfaces of windshields of different vehicle models, and has advantages such as low processing and bonding difficulty, strong maintainability, and wide adaptability.

[0025] The glass layer 4 of the flexible glass 3 is made of aluminosilicate glass, PC, PMMA, PET, TPU, or TPE. PC is polycarbonate, PMMA is polymethyl methacrylate, PET is polyethylene terephthalate, TPU is thermoplastic polyurethane, and TPE is thermoplastic elastomer. All of the above materials can be used as the material for the glass layer 4 of the flexible glass 3.

[0026] The glass layer 4 of the flexible glass 3 is made of aluminosilicate glass or borosilicate glass.

[0027] The flexible glass 3 has a glass layer 4 thickness of 0.05-2.0 mm and a coating layer 5 thickness of 80-150 nm. The adhesive layer 2 has a thickness of 0.02-0.1 mm.

[0028] The adhesive layer 2 is a peelable elastic adhesive layer, comprising a hot melt adhesive layer and a VHB tape layer. With this structure, the hot melt adhesive layer can be peeled off after being heated to 120°C. When it is necessary to remove the flexible glass, the flexible glass and the windshield can be separated quickly, as can the adhesive layer and the flexible glass. This facilitates convenient and quick replacement of the flexible glass and reduces maintenance costs.

[0029] The flexible glass 3 has a serrated positioning boss on the edge of the glass layer 4, with the highest point of the serrated positioning boss having a height of 0.05-1.0 mm. In this structure, the serrated positioning boss on the edge of the glass layer allows for mechanical interlocking between the serrated positioning boss and the nano-coating on the windshield surface when the flexible glass is bonded to it, further enhancing adhesion stability.

[0030] The coating layer 5 has a p-light reflectivity >10% and a s-light reflectivity <40%; simultaneously, the s-light reflectivity >10% and the p-light reflectivity <40%. The above structure satisfies the reflectivity requirements.

[0031] The flexible glass 3 has a radius of curvature R of 800-2000 mm. In the above structure, the glass layer of the flexible glass 3 is pre-formed by a hot bending process, achieving a windshield surface curvature error of ≤0.3 mm.

[0032] The surface hardness of the glass layer 4 of the flexible glass 3 is ≥6H. With the above structure, the flexible glass is attached to the windshield and meets the requirements of the vehicle vibration environment (10-2000Hz, 20g acceleration).

[0033] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A projection-type head-up display screen structure, characterized in that: The windshield (1), adhesive layer (2), and flexible glass (3) are included. The flexible glass (3) includes a glass layer (4) and a coating layer (5). The flexible glass (3) is bonded to the windshield (1) through the adhesive layer (2). The radius of curvature of the flexible glass (3) and the surface error of the windshield (1) are ≤0.3mm. The adhesive layer (2) is attached to the inner side of the glass layer (4) of the flexible glass (3), and the coating layer (5) is attached to the outer side of the glass layer (4).

2. The projection-type head-up display screen structure according to claim 1, characterized in that: The glass layer (4) of the flexible glass (3) is aluminosilicate glass, PC, PMMA, PET, TPU, or TPE.

3. The projection-type head-up display structure according to claim 1 or 2, characterized in that: The glass layer (4) of the flexible glass (3) is made of aluminosilicate glass or borosilicate glass.

4. The projection-type head-up display structure according to claim 1 or 2, characterized in that: The thickness of the glass layer (4) of the flexible glass (3) is: 0.05-2.0mm, coating layer (5) thickness: 80-150nm.

5. The projection-type head-up display screen structure according to claim 4, characterized in that: The thickness of the adhesive layer (2) is 0.02-0.1 mm.

6. The projection-type head-up display structure according to claim 1 or 2, characterized in that: The adhesive layer (2) is a peelable elastic adhesive layer, which includes a hot melt adhesive layer and a VHB tape layer.

7. The projection-type head-up display structure according to claim 1 or 2, characterized in that: The flexible glass (3) has a serrated positioning boss on the edge of the glass layer (4), with the highest point of the serrated positioning boss being 0.05-1.0mm.

8. The projection head-up display structure according to claim 1 or 2, characterized in that: The coating layer (5) has a P-light reflectance >10% and an S-light reflectance <40%; at the same time, the S-light reflectance >10% and the P-light reflectance <40%.

9. The projection-type head-up display structure according to claim 1 or 2, characterized in that: The flexible glass (3) has a radius of curvature R = 800-2000 mm.

10. The projection-type head-up display structure according to claim 1 or 2, characterized in that: The surface hardness of the glass layer (4) is ≥6H.

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