Head-up display film, front windshield and head-up display system
By setting a silicon layer and a specific coating layer structure in the HUD film, the problem of poor adhesion of the reflective film is solved, the adhesion and durability of the film are improved, and the stability and imaging effect of the HUD are ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-03-17
AI Technical Summary
The reflective film of the HUD film has poor adhesion to the substrate surface, which affects normal use.
A silicon layer with a thickness of 1 nm to 5 nm is disposed between the substrate layer and the coating layer, and a specific combination of coating layer structures, including a first reflective layer, a second reflective layer and a capping layer, is prepared by magnetron sputtering coating process.
This improved the interlayer adhesion and environmental resistance of the head-up display film, ensuring the stability and imaging effect of the HUD.
Smart Images
Figure CN224005362U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of head-up display technology, specifically relating to a head-up display film, a windshield, and a head-up display system. Background Technology
[0002] HUD, or Head-Up Display, is a display device that projects important information into the driver's field of vision, allowing the driver to view information without looking down, thus improving driving safety and ease of operation. Due to its advantages such as improved driving safety, enhanced driving experience, and reduced visual fatigue, the application of HUDs is constantly expanding.
[0003] With the continuous development of technology, the functions of HUD are constantly being updated, and people's requirements for HUD are also constantly increasing. HUD film is generally composed of a substrate and a reflective film on the surface of the substrate. However, as the HUD film is used for a longer period of time, the adhesion of the reflective film to the substrate surface becomes worse, affecting the normal use of the HUD film.
[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content
[0005] The purpose of this invention is to provide a head-up display film, a windshield, and a head-up display system. The head-up display film has superior adhesion between the substrate layer and the layer structure thereon, and also has superior environmental resistance.
[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:
[0007] A head-up display film includes a substrate layer and a coating layer disposed on one side of the substrate layer, wherein the coating layer includes a first reflective layer, a second reflective layer and a capping layer stacked sequentially.
[0008] A silicon layer is provided between the substrate layer and the coating layer, and the thickness of the silicon layer is 1nm to 5nm.
[0009] In one or more embodiments of this utility model, the silicon layer thickness is 2nm.
[0010] In one or more embodiments of this utility model, the first reflective layer is a nickel-chromium alloy layer with a thickness of 2nm to 10nm;
[0011] The second reflective layer is an aluminum layer with a thickness of 10nm to 20nm.
[0012] In one or more embodiments of the present invention, the capping layer includes a silicon dioxide layer disposed on the second reflective layer and a nickel-chromium alloy layer disposed on the silicon dioxide layer;
[0013] The thickness of the silicon dioxide layer is 80nm to 120nm, and the thickness of the nickel-chromium alloy layer is 4nm to 7nm.
[0014] In one or more embodiments of this utility model, the first reflective layer is a nickel-chromium alloy layer with a thickness of 10nm to 20nm;
[0015] The second reflective layer is a silver layer with a thickness of 15nm to 20nm.
[0016] In one or more embodiments of the present invention, the capping layer includes a nickel-chromium alloy layer disposed on the second reflective layer and a niobium oxide layer disposed on the nickel-chromium alloy layer;
[0017] The thickness of the nickel-chromium alloy layer is 2nm to 6nm, and the thickness of the niobium oxide layer is 30nm to 45nm.
[0018] In one or more embodiments of the present invention, a hardening coating is further provided between the substrate layer and the silicon layer, and the thickness of the hardening coating is 3μm to 5μm.
[0019] In one or more embodiments of this utility model, the substrate layer is a PC layer, a TAC layer, or a PET layer.
[0020] The technical solution provided by another specific embodiment of this utility model is as follows:
[0021] A windshield includes a glass body, the glass body including an inner glass, an outer glass, and a head-up display film disposed between the inner glass and the outer glass. The substrate layer of the head-up display film has an adhesive layer on the side facing away from the coating layer. The head-up display film is attached to the inner surface of the outer glass through the adhesive layer, and the coating layer faces the inner glass.
[0022] The technical solution provided by another specific embodiment of this utility model is as follows:
[0023] A head-up display system includes a windshield and a projection light source, the projection light source being used to emit P-polarized light to the windshield.
[0024] Compared with the prior art, the head-up display film of this invention has excellent interlayer adhesion and superior resistance to environmental testing. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the head-up display film in Embodiment 1 of this utility model;
[0027] Figure 2 This is a schematic diagram of the head-up display film in Embodiment 2 of this utility model.
[0028] Explanation of key figure labels:
[0029] 1. PET substrate; 2. Acrylic resin layer; 3. Silicon layer; 4. Nickel-chromium alloy layer; 5. Aluminum layer; 6. Silica layer; 7. Silver layer; 8. Niobium oxide layer. Detailed Implementation
[0030] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.
[0031] A specific embodiment of this utility model provides a head-up display film, including a substrate layer, on which a hardening coating, a silicon layer and a coating layer are sequentially disposed. The coating layer includes a first reflective layer, a second reflective layer and a capping layer sequentially stacked.
[0032] Specifically, the substrate layer is made of PC (polycarbonate), TAC (triacetate), or PET (polyethylene terephthalate), and the thickness can be selected as 50μm, 100μm, 125μm, or 188μm. The hardening coating is an acrylic resin layer with a thickness of 3μm to 5μm, and the acrylic resin can be selected from Arakawa Chemical CHT-X1-NS.
[0033] Furthermore, both the silicon layer and the coating layer are prepared using a magnetron sputtering deposition process. The thickness of the silicon layer is 1 nm to 5 nm, specifically 1 nm, 2 nm, 3 nm, 4 nm, or 5 nm, preferably 2 nm. By incorporating the silicon layer, the adhesion of the coating layer to the substrate layer can be improved, maintaining the stability of the head-up display film structure, thereby also improving the environmental resistance of the head-up display film.
[0034] Furthermore, the second reflective layer is an aluminum layer or a silver layer. When the second reflective layer is an aluminum layer, the thickness of the aluminum layer is 10nm to 20nm. The first reflective layer is a nickel-chromium alloy layer with a thickness of 2nm to 10nm. The capping layer includes a silicon dioxide layer disposed on the aluminum layer and a nickel-chromium alloy layer disposed on the silicon dioxide layer. The thickness of the silicon dioxide layer is 80nm to 120nm, and the thickness of the nickel-chromium alloy layer is 4nm to 7nm.
[0035] When the second reflective layer is a silver layer, the thickness of the silver layer is 15nm to 20nm, the first reflective layer is a nickel-chromium alloy layer, and the thickness is 10nm to 20nm; the capping layer includes a nickel-chromium alloy layer disposed on the second reflective layer and a niobium oxide layer disposed on the nickel-chromium alloy layer, the thickness of the nickel-chromium alloy layer is 2nm to 6nm, and the thickness of the niobium oxide layer is 30nm to 45nm.
[0036] The first reflective layer is made of nickel-chromium alloy, which can improve the reflectivity of the head-up display film. By improving optical reflection, the imaging effect of the head-up display film is enhanced. In addition, it can also improve the adhesion of the second reflective layer.
[0037] The second reflective layer can be either aluminum or silver. Aluminum has high reflectivity across a wide spectral range, reflecting light of different wavelengths, while silver has high reflectivity in both the visible and infrared regions. Choosing either aluminum or silver as the second reflective layer ensures excellent light reflection in the head-up display (HUD) film. However, silver is more prone to oxidation than aluminum. Therefore, when using silver as the second reflective layer, a nickel-chromium alloy layer and a niobium oxide layer are chosen as capping layers. When the nickel-chromium alloy layer is formed by magnetron sputtering, no oxygen is present in the gas environment, preventing silver oxidation. Furthermore, the nickel-chromium alloy layer also acts as a barrier, protecting the silver layer and reducing the likelihood of subsequent oxidation. The niobium oxide layer also acts as a barrier, improving the environmental performance of the HUD film. Additionally, the nickel-chromium alloy layer and niobium oxide layer also enhance the reflectivity of the HUD film, improving imaging performance.
[0038] When the second reflective layer is an aluminum layer, selecting a silicon dioxide layer and a nickel-chromium alloy layer as the capping layer can not only protect the inner structure of the head-up display film and improve the ambient light performance, but also optimize the light reflection performance of the head-up display film.
[0039] Another specific embodiment of the present invention provides a windshield, including a glass body, the glass body including an inner glass, an outer glass and the aforementioned head-up display film disposed between the inner glass and the outer glass, the substrate layer of the head-up display film having an adhesive layer on the side opposite to the coating layer, the head-up display film being adhered to the inner surface of the outer glass through the adhesive layer, and the coating layer facing the inner glass side.
[0040] Another specific embodiment provides a head-up display system, including the aforementioned windshield and a projection light source, the projection light source being used to emit P-polarized light to the windshield.
[0041] The present invention will be further described in detail below with reference to specific embodiments.
[0042] Example 1
[0043] A 125 μm thick PET substrate 1 is used. An acrylic resin layer 2 with a thickness of 4 μm is coated onto the PET substrate 1. After coating, a silicon layer 3 is prepared on the acrylic resin layer 2 using a magnetron sputtering deposition process. The silicon layer 3 is made of Si (metallic silicon) and has a thickness of 2 nm. On the silicon layer 3, a 5 nm thick nickel-chromium alloy layer 4, a 15 nm thick aluminum layer 5, a 90 nm thick silicon dioxide layer 6, and a 5 nm thick nickel-chromium alloy layer 4 are sequentially prepared using a magnetron sputtering deposition process to obtain the head-up display film.
[0044] Example 2
[0045] A 125 μm thick PET substrate 1 is used. An acrylic resin layer 2 with a thickness of 4 μm is coated onto the PET substrate 1. After coating, a silicon layer 3 is prepared on the acrylic resin layer 2 using a magnetron sputtering deposition process. The silicon layer 3 is made of Si (metallic silicon) and has a thickness of 2 nm. On the silicon layer 3, a 15 nm thick nickel-chromium alloy layer 4, an 18 nm thick silver layer 7, a 5 nm thick nickel-chromium alloy layer 4, and a 40 nm thick niobium oxide layer 8 are sequentially prepared using a magnetron sputtering deposition process to obtain the head-up display film.
[0046] Comparative Example 1
[0047] A 125 μm thick PET substrate was used as the substrate, and an acrylic resin layer with a thickness of 4 μm was coated on the PET substrate. After coating, a 5 nm thick nickel-chromium alloy layer, a 15 nm thick aluminum layer, a 90 nm thick silicon dioxide layer, and another 5 nm thick nickel-chromium alloy layer were sequentially prepared on the acrylic resin layer using a magnetron sputtering deposition process to obtain the head-up display film.
[0048] Comparative Example 2
[0049] A 125 μm thick PET substrate was used as the substrate, and an acrylic resin layer with a thickness of 4 μm was coated on the PET substrate. After coating, a 15 nm thick nickel-chromium alloy layer, an 18 nm thick silver layer, a 5 nm thick nickel-chromium alloy layer, and a 40 nm thick niobium oxide layer were sequentially prepared on the acrylic resin layer using a magnetron sputtering deposition process to obtain the head-up display film.
[0050] Adhesion tests were conducted according to GB / T 9286-2021 "Paints and Varnishes Cross-cut Test", and salt spray resistance tests were conducted according to GB / T2423.17-2024 "Environmental Testing Part 2: Test Methods, Test Ka: Salt Spray". The results are shown in Table 1.
[0051] Table 1 Performance Test Results
[0052]
[0053] As can be seen from Table 1, the head-up display film of this invention has better adhesion and environmental resistance, indicating that by setting a silicon layer between the hardened coating and the coating layer, and combining the specific structural composition of the coating layer, this invention effectively improves the interlayer adhesion and environmental resistance of the head-up display film.
[0054] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A head-up display film, characterized by, The film comprises a substrate layer and a coating layer arranged on one side of the substrate layer, wherein the coating layer comprises a first reflective layer, a second reflective layer and a capping layer arranged in sequence. A silicon layer is arranged between the substrate layer and the coating layer, and the thickness of the silicon layer is 1-5nm.
2. The heads-up display film of claim 1, wherein The thickness of the silicon layer is 2nm.
3. The heads-up display film of claim 1, wherein, The first reflective layer is a nickel-chromium alloy layer, and the thickness of the nickel-chromium alloy layer is 2-10nm. The second reflective layer is an aluminum layer, and the thickness of the aluminum layer is 10-20nm.
4. The heads-up display film of claim 3, wherein, The capping layer comprises a silicon dioxide layer arranged on the second reflective layer and a nickel-chromium alloy layer arranged on the silicon dioxide layer. The thickness of the silicon dioxide layer is 80-120nm, and the thickness of the nickel-chromium alloy layer is 4-7nm.
5. The heads-up display film of claim 1, wherein, The first reflective layer is a nickel-chromium alloy layer, and the thickness of the nickel-chromium alloy layer is 10-20nm. The second reflective layer is a silver layer, and the thickness of the silver layer is 15-20nm.
6. The heads-up display film of claim 5, wherein, The capping layer comprises a nickel-chromium alloy layer arranged on the second reflective layer and a niobium oxide layer arranged on the nickel-chromium alloy layer. The thickness of the nickel-chromium alloy layer is 2-6nm, and the thickness of the niobium oxide layer is 30-45nm.
7. The heads-up display film of claim 1, wherein A hard coating layer is further arranged between the substrate layer and the silicon layer, and the thickness of the hard coating layer is 3-5μm.
8. The heads-up display film of claim 1, wherein, The substrate layer is a PC layer, a TAC layer or a PET layer.
9. A front windshield characterized by, The head-up display film comprises a glass body, wherein the glass body comprises an inner glass, an outer glass and the head-up display film according to any one of claims 1-8 arranged between the inner glass and the outer glass, the substrate layer of the head-up display film is provided with an adhesive layer on the side away from the coating layer, the head-up display film is attached to the inner surface of the outer glass through the adhesive layer, and the coating layer faces the inner glass.
10. A heads-up display system characterized by, The head-up display film comprises the front windshield glass according to claim 9 and a projection light source, wherein the projection light source is used for emitting P-polarized light to the front windshield glass.