A vehicle projection screen structure

Abstract

The utility model belongs to vehicle parts technical field, more specifically, it is related to a kind of vehicle projection reflection screen structure. Including flexible glass layer (2), adhesive layer (3), rear shell (4), flexible glass layer (2) is adhered rear shell (4) by adhesive layer (3) and forms screen structure, rear shell (4) is close to windshield glass (1), rear shell (4) lower part is fixedly clamped in the positioning groove (6) on instrument desk (5), screen structure is curved surface structure.The vehicle projection reflection screen structure described in the utility model, simple structure can effectively solve the high-difficulty problem of coating, realize flexible glass layer replacement alone, realize the stability of reflectivity promotion.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle parts technology, and more specifically, it relates to a vehicle projection reflective screen structure. Background Technology

[0002] PHUD (Panoramic 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 use direct coating on 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 (replacement cost per set > 5000 RMB); the glass body is thick (typically > 3mm), which cannot meet the PHUD's requirement for a lightweight reflective surface.

[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 vehicle projection reflective screen structure that is simple in structure, can effectively solve the high difficulty of coating, can realize the individual replacement of flexible glass layer, and can improve reflectivity stability, 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 vehicle projection reflective screen structure, including a flexible glass layer, an adhesive layer, and a rear shell. The flexible glass layer is bonded to the rear shell through the adhesive layer to form a screen structure. The rear shell is close to the windshield, and the lower part of the rear shell is fixedly installed in a positioning groove on the dashboard. The screen structure is a curved structure.

[0008] The curvature deviation between the screen structure and the inner surface of the windshield is ≤0.2mm.

[0009] The flexible glass layer has a thickness of 0.05-2.0 mm and is made of aluminosilicate glass or borosilicate glass.

[0010] The outer surface of the rear shell is close to the inner surface of the windshield. The inner surface of the rear shell is bonded to the inner surface of the flexible glass layer through an adhesive layer. A coating layer is provided on the outer surface of the flexible glass layer, with the coating layer facing the end of the vehicle projection device. The coating layer thickness is 50-200nm.

[0011] The adhesive layer is a peelable elastic adhesive, which is a modified hot melt adhesive or a TPE composite adhesive; the adhesive layer thickness is 0.1-0.3mm.

[0012] The rear shell is made of injection molded parts or aluminum parts.

[0013] When the rear shell is selected as an injection molded part, it is made of PC, ABS, PMMA or PE alloy. When the rear shell 4 is selected as an aluminum part, it is made of aluminum-copper, aluminum-silicon, aluminum-magnesium or aluminum-magnesium-silicon or aluminum-zinc-magnesium alloy.

[0014] The inner surface of the rear shell is provided with multiple positioning protrusions near the edge. When the inner surface of the flexible glass layer is connected to the inner surface of the rear shell through an adhesive layer, the edge of the flexible glass layer is configured to abut against the positioning area formed by the multiple positioning protrusions.

[0015] The surface error of the back shell and the flexible glass layer is <0.05mm.

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

[0017] The vehicle projection reflective screen structure described in this utility model no longer uses the method of pasting the screen structure onto the windshield. Instead, after the screen structure is manufactured, a gap exists between the screen structure and the windshield. The screen structure is fixed in a positioning groove on the dashboard by the structure of the rear shell, with the lower part of the rear shell being fixedly clipped in. During the manufacturing of the screen structure, the flexible glass layer (glass substrate) is heat-bent and shaped, and then coated using PVD / CVD processes to form a coating layer. A functional adhesive layer / glue is applied to the inner surface of the rear shell. Pressure is applied between the flexible glass layer and the rear shell, and the pressure holding time is controlled to achieve reliable bonding and form the screen structure. This approach offers several advantages: First, it is technologically feasible: the glass layer and coating layer are processed independently, and the hot bending process creates a reliable, adaptable curved surface (yield > 90%), solving the high difficulty of direct coating. Second, it is maintainable: the adhesive layer is peelable, and the reflective screen layer formed by the flexible glass layer and coating layer can be replaced separately. Glass damage does not lead to the entire product being scrapped, reducing maintenance costs to 30% of traditional solutions. Third, it is adaptable: the combination of the flexible glass layer and the pre-formed rear shell can adapt to the windshield curved surfaces of more than 80% of vehicle models (no need for customized windshields). Fourth, it has excellent optical performance: the coating layer is unaffected by windshield processing, improving reflectivity stability. 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 vehicle projection reflective screen structure described in this utility model;

[0020] Figure 2 This is a schematic diagram of the vehicle projection reflective screen structure described in this utility model;

[0021] Figure 3 This is a top cross-sectional view of the vehicle projection reflective screen structure described in this utility model.

[0022] Figure 4 This is a side cross-sectional view of the vehicle projection reflective screen structure described in this utility model.

[0023] The labels in the attached diagram are as follows: 1. Windshield; 2. Flexible glass layer; 3. Adhesive layer; 4. Rear shell; 5. Dashboard; 6. Positioning groove; 7. Coating layer; 8. Positioning boss. Detailed Implementation

[0024] 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:

[0025] As attached Figure 1 - Appendix Figure 4 As shown, this utility model is a vehicle projection reflective screen structure, including a flexible glass layer 2, an adhesive layer 3, and a rear shell 4. The flexible glass layer 2 is bonded to the rear shell 4 through the adhesive layer 3 to form the screen structure. The rear shell 4 is close to the windshield 1, and the lower part of the rear shell 4 is fixedly fastened in a positioning groove 6 on the dashboard 5. The screen structure is a curved structure. To address the shortcomings of the prior art, an improved technical solution is proposed. In the structure setup, instead of pasting the screen structure directly onto the windshield, a gap exists between the screen structure and the windshield after fabrication. The screen structure is fixed in place by the rear shell structure, with the lower part of the rear shell 4 fixedly fastened in the positioning groove 6 on the dashboard 5. During screen structure fabrication, the flexible glass layer (glass substrate) is heat-bent and shaped, and then coated using PVD / CVD processes (environmental cleanliness Class 1000) to form a coating layer; a functional adhesive layer / glue is applied to the inner surface of the back shell (coating accuracy ±0.02mm); a pressure of 0.5-1.0MPa is applied between the flexible glass layer and the back shell, and the pressure is held for 30-60s to achieve reliable bonding and form the screen structure. This approach offers several advantages: First, it is technologically feasible. The glass layer and coating layer are processed independently, and the hot bending process creates a reliable, adaptable curved surface (yield > 90%), solving the high difficulty of direct coating. Second, it is maintainable. The adhesive layer is peelable, and the reflective screen layer formed by the flexible glass layer and coating layer can be replaced separately. Glass damage does not lead to the entire product being scrapped, reducing maintenance costs to 30% of traditional solutions. Third, it is adaptable. The combination of the flexible glass layer and the pre-formed rear shell can adapt to the windshield curved surfaces of more than 80% of vehicle models (no need for customized windshields). Fourth, it has excellent optical performance. The coating layer is unaffected by windshield processing, improving reflectivity stability (reflectivity fluctuation < 5% in environments ranging from -40℃ to 85℃). This effectively improves the overall performance of the product. The vehicle projection reflective screen structure described in this invention is simple in structure and effectively solves the high difficulty of coating, allows for the separate replacement of the flexible glass layer, and improves reflectivity stability.

[0026] The curvature deviation between the screen structure and the inner surface of the windshield 1 is ≤0.2mm. The flexible glass layer 2 has a thickness of 0.05-2.0mm and is made of aluminosilicate glass or borosilicate glass. In forming the screen structure, a coating is first applied to the surface of the flexible glass layer. The flexible glass layer uses flexible glass (such as aluminosilicate glass or borosilicate glass) with a thickness of 0.05-2.0mm, processed through hot bending (curved surface forming at room temperature, curvature radius R = 500-2000mm) or hot bending (shaped at 300-600℃ to adapt to complex curved surfaces) processes to ensure that the curvature deviation with the inner surface of the windshield of the target vehicle is ≤0.2mm, thus improving the adaptability of the screen structure.

[0027] The outer surface of the rear shell 4 is close to the inner surface of the windshield 1. The inner surface of the rear shell 4 is bonded to the inner surface of the flexible glass layer 2 via an adhesive layer 3. A coating layer 7 is disposed on the outer surface of the flexible glass layer 2, facing the vehicle projection device end; the coating layer 7 has a thickness of 50-200nm. In the above structure, a PVD (physical vapor deposition) or CVD (chemical vapor deposition) pre-coating is used on the outer surface of the glass (facing the PHUD projection end) to form a coating layer. The coating layer is a high-reflectivity dielectric film (P-light reflectivity > 10%, S-light reflectivity < 40% or S-light reflectivity > 10%, P-light reflectivity < 40%, for the average reflectivity of the 380nm-780nm wavelength band), with a film thickness of 50-200nm (to avoid interference fringes). The function of the reflective glass: as the core reflective surface of the PHUD projection, the flexible glass has an impact resistance of ≥ 300MPa (meeting the requirements of the vehicle vibration environment).

[0028] The adhesive layer 3 is a peelable elastic adhesive, which is a modified hot melt adhesive or a TPE composite adhesive; the thickness of adhesive layer 3 is 0.1-0.3mm. In the above structure, the material of the adhesive layer is a peelable elastic adhesive (such as a modified hot melt adhesive or a TPE composite adhesive), with a thickness of 0.1-0.3mm, possessing the following characteristics: adhesive strength: ≥5N / cm (ensuring no detachment between the glass and the rear shell); temperature resistance: maintaining elasticity at -40℃ to 85℃ (adapting to temperature differences and deformation in the vehicle); maintainability: peelable after heating to 120-150℃ (allowing for individual replacement of the glass layer); function: used only for mechanical fixation, does not participate in optical reflection (avoiding optical distortion of the adhesive layer), and compensates for assembly errors (<0.1mm) between the glass and the rear shell through elastic deformation.

[0029] The rear shell 4 is made of injection molded material or aluminum. When injection molded, the rear shell 4 is made of PC, ABS, PMMA, or PE alloy; when aluminum, it is made of aluminum-copper, aluminum-silicon, aluminum-magnesium, aluminum-magnesium-silicon, or aluminum-zinc-magnesium alloy. In this structure, the rear shell 4 is pre-formed using a mold, perfectly matching the curved surface of the flexible glass layer formed by hot bending (curvature error < 0.05 mm).

[0030] The inner surface of the rear shell 4 is provided with multiple positioning protrusions 8 near the edge. When the inner surface of the flexible glass layer 2 is connected to the inner surface of the rear shell 4 through the adhesive layer 3, the edge of the flexible glass layer 2 is configured to abut against the positioning area formed by the multiple positioning protrusions 8. With this structure, the flexible glass layer and the rear shell are aligned through the positioning protrusions, ensuring accurate positioning of the flexible glass and the rear shell.

[0031] The surface error of the rear shell 4 and the flexible glass layer 2 is <0.05mm.

[0032] This utility model addresses the problems in the existing technology by employing the following technical means: Material innovation: A flexible glass substrate with a thickness of 0.05-2.0mm (different from traditional thick glass) is selected and pre-formed through a hot bending process to adapt to the curvature of windshields of different vehicle models. A coating is used to achieve P-light reflectivity >10% and S-light reflectivity <40%, or S-light reflectivity >10% and P-light reflectivity <40% (average reflectivity in the 380nm-780nm wavelength band); Process optimization: The glass substrate is pre-coated independently (PVD or CVD method), avoiding conflicts with the windshield forming process, and improving the coating yield to over 90%; Connection method: A peelable adhesive layer (such as hot melt adhesive, VHB) is used to achieve a detachable connection between the glass and the back cover, requiring only the replacement of the reflective screen for later maintenance (reducing costs by 60%); Structural design: A three-layer structure of "coated glass + functional adhesive layer + back cover" is used to achieve a reliable arrangement near the windshield.

[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 vehicle projection screen structure, characterized by: It includes a flexible glass layer (2), an adhesive layer (3), and a back shell (4). The flexible glass layer (2) is bonded to the back shell (4) through the adhesive layer (3) to form a screen structure. The back shell (4) is close to the windshield (1). The lower part of the back shell (4) is fixedly installed in the positioning groove (6) on the dashboard (5). The screen structure is a curved structure.

2. The vehicular projection screen structure of claim 1, wherein: The curvature deviation between the screen structure and the inner surface of the windshield glass (1) is ≤0.2mm.

3. The vehicular projection screen structure of claim 1, wherein: The flexible glass layer (2) has a thickness of 0.05-2.0 mm and is made of aluminosilicate glass or borosilicate glass.

4. The vehicle projection reflective screen structure according to claim 1, characterized in that: The outer surface of the rear shell (4) is close to the inner surface of the windshield (1). The inner surface of the rear shell (4) is bonded to the inner surface of the flexible glass layer (2) by an adhesive layer (3). A coating layer (7) is provided on the outer surface of the flexible glass layer (2). The coating layer (7) faces the end of the vehicle projection device. The thickness of the coating layer (7) is 50-200nm.

5. The vehicular projection screen structure of claim 1, wherein: The adhesive layer (3) is a peelable elastic adhesive, which is a modified hot melt adhesive or a TPE composite adhesive; the thickness of the adhesive layer (3) is 0.1-0.3 mm.

6. The vehicular projection screen structure of claim 1, wherein: The rear shell (4) is made of injection molded parts or aluminum parts.

7. The vehicular projection screen structure of claim 1, wherein: When the back shell (4) is selected as an injection molded part, it is PC, ABS, PMMA or PE alloy. When the back shell (4) is selected as an aluminum part, it is aluminum copper or aluminum silicon or aluminum magnesium or aluminum magnesium silicon or aluminum zinc magnesium alloy.

8. The vehicular projection screen structure of claim 1, wherein: The inner surface of the rear shell (4) is provided with multiple positioning protrusions (8) near the edge. When the inner surface of the flexible glass layer (2) is connected to the inner surface of the rear shell (4) through the adhesive layer (3), the edge of the flexible glass layer (2) is configured to abut against the positioning area formed by the multiple positioning protrusions (8).

9. The vehicular projection screen structure of claim 1, wherein: The surface error of the back shell (4) and the flexible glass layer (2) is <0.05mm.

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