Wide-viewing-angle head-up display film, front windshield and head-up display system
By using a wide viewing angle head-up display film in the HUD system, the difficulty of customizing wedge glass and ghosting problems are solved, and the clear projection effect is achieved at a wide viewing angle.
Patent Information
- Application Number
- CN202422357477.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-26
AI Technical Summary
In the existing HUD system, wedge-shaped glass needs to be customized for each model, which leads to difficulty in mass production, and still has ghosting problems in installation deviations, and cannot work normally from a wide viewing angle.
A wide-view angle head-up display film is adopted, including a substrate layer and a P-polarized light inverter layer. By bonding and fixing on the inner surface of the front glass, the reflectivity of the P-polarized light and the contrast of the reflected images of the inner and outer surfaces is improved.
Effectively eliminate ghosting, improve the sharpness and brightness of the projected image, suitable for wide viewing angles, providing users with better image quality and viewing experience.
Smart Images
Figure CN223078497U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of head-up display (HUD), and particularly relates to a wide-view head-up display film, a front windshield and a head-up display system. Background Art
[0002] A heads-up display (hereinafter referred to as HUD) system, also known as a head-up display system, is used to project important driving information such as speed and navigation onto the windshield in front of the driver, enabling the driver to view important driving information such as speed and navigation without having to lower or turn their head as much as possible. The HUD uses the windshield as a combiner for virtual images and real scenes, and the light from the HUD is reflected by the windshield to the human eye, allowing the driver to see the projected virtual image. The windshield has a certain thickness, that is, it has two surfaces. When a beam of light in the optical engine is incident at an oblique angle, due to the different refractive indices of air and glass media, the light will be reflected and refracted at the first surface of the windshield respectively; and after the refracted light reaches the second surface of the glass, it will continue to be reflected and refracted. The two reflected lights do not completely coincide, and the two will reach the human eye in a staggered form, forming two images with the same content and staggered positions, resulting in double images. The existence of double images not only reduces the imaging quality, but also brings a sense of dizziness to the viewer, affecting the driving experience of the driver.
[0003] The current mainstream solution to solve the double-image problem is still to use wedge-shaped glass, which can eliminate double images to a certain extent and enhance the user experience. However, this method has certain drawbacks. The wedge angle is affected by the position of the image source and the incident angle. Therefore, the HUD needs to be customized for each vehicle model, which restricts the mass production of the HUD; secondly, in practice, there are still double images due to reasons such as the installation deviation between the windshield and the HUD; finally, since the HUD system usually has a specific effective viewing angle range, observers outside this range are located on the reflection path of the light and cannot receive the correct projected image completely. Therefore, in the case of a wide viewing angle, the HUD processed by this method cannot work properly. Summary of the Utility Model
[0004] The purpose of this application is to provide a wide-view head-up display film, a front windshield and a head-up display system to solve the technical problems in the prior art that using wedge-shaped glass to solve the double-image problem requires customization for each vehicle model, restricts mass production, there are still double images due to installation deviation, and the double-image problem cannot be solved under a wide viewing angle.
[0005] To achieve the above object, the first aspect of this application provides a wide-view head-up display film, including:
[0006] A substrate layer;
[0007] A P-polarized light high-reflection layer is disposed on one side of the substrate layer. The P-polarized light high-reflection layer includes a silicon layer, a high-refractive-index layer, and a low-refractive-index layer sequentially arranged in a direction away from the substrate layer.
[0008] Among them, the refractive index of the high-refractive-index layer is 2.0 to 2.3, and the refractive index of the low-refractive-index layer is 1.45 to 1.5.
[0009] In one or more embodiments, the high-refractive-index layer is a nickel-chromium alloy layer, and the thickness of the high-refractive-index layer is 25 to 35 nm.
[0010] In one or more embodiments, the low-refractive-index layer is a silicon dioxide layer, and the thickness of the low-refractive-index layer is 90 to 110 nm.
[0011] In one or more embodiments, the thickness of the silicon layer is 1 to 10 nm.
[0012] In one or more embodiments, the substrate layer is a PET substrate layer, and the total light transmittance of the substrate layer is greater than or equal to 90%.
[0013] In one or more embodiments, a hardening layer is further included, and the hardening layer is disposed between the substrate layer and the P-polarized light high-reflection layer.
[0014] In one or more embodiments, the thickness of the hardening layer is 3 to 5 μm.
[0015] To achieve the above object, a second aspect of the present application provides a front windshield, including an inner surface and an outer surface disposed opposite to each other. The inner surface is provided with the wide-view head-up display film according to any one of the above embodiments, and the P-polarized light high-reflection layer of the wide-view head-up display film is adhesively fixed to the inner surface on a side away from the substrate layer.
[0016] In one or more embodiments, after the inner surface of the front windshield is attached to the wide-view head-up display film, the average reflectivity of the P-polarized light incident at an angle of 40° in the spectral range of 400 to 700 nm is greater than 18%, and the average reflectivity of the P-polarized light incident at an angle of 60° is greater than 22%.
[0017] To achieve the above object, a third aspect of the present application provides a head-up display system, including:
[0018] The front windshield according to any one of the above embodiments, with an HUD area provided on the inner surface;
[0019] A projection light source, the light-emitting end of which is aligned with the HUD area, and the projection light source is used to emit P-polarized light to the HUD area.
[0020] Distinct from the prior art, the beneficial effects of the present application are as follows:
[0021] The head-up display film of the present application has a high reflectivity to P-polarized light. After being applied to the inner side of the front windshield, on the one hand, it can improve the clarity and brightness of the projected image, and on the other hand, it can increase the contrast between the reflected images on the inner and outer surfaces of the front windshield, thereby eliminating the ghosting problem. In particular, since it solves the ghosting problem by increasing the contrast between the reflected images on both sides of the glass, it is applicable to a wide viewing angle and provides better image quality and viewing experience for users. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0023] Figure 1 It is a schematic structural diagram of an embodiment of the wide-view head-up display film of the present application;
[0024] Figure 2 It is a schematic structural diagram of another embodiment of the wide-view head-up display film of the present application;
[0025] Figure 3 It is a schematic structural diagram of an embodiment of the front windshield of the present application;
[0026] Figure 4 It is a schematic structural diagram of an embodiment of the head-up display system of the present application;
[0027] Figure 5 It is the reflectivity curve of the inner side of the front windshield with the head-up display film of Example 1 to P-polarized light;
[0028] Figure 6 It is the reflectivity curve of the inner and outer sides of the front windshield without the head-up display film to P-polarized light;
[0029] Figure 7 It is the reflectivity curve of the inner side of the front windshield with the films of Example 1, Example 2 and Comparative Example 1 to P-polarized light at an incident angle of 60°. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0031] Currently, the HUD system uses a wedge-shaped glass placed on the front windshield to solve the problem of eliminating double images. However, due to the influence of the image source position and the incident angle, each vehicle model requires a customized wedge-shaped glass, which restricts the mass production of the HUD system. Moreover, due to installation deviations, the wedge-shaped glass still cannot completely avoid the double image phenomenon.
[0032] In addition, since the HUD system usually has a specific effective viewing angle range, observers outside this range are located on the reflection path of the light and cannot fully receive the correct projected image. Therefore, in the case of a wide viewing angle, the HUD processed by the method of using a wedge-shaped glass cannot work properly.
[0033] To solve the above problems, the applicant has developed a new type of wide-view head-up display film. This head-up display film can be applied to the inner surface of the front windshield and can effectively solve the double image problem at a wide viewing angle of 40 - 60°. Among them, this head-up display film can effectively increase the reflectivity of the inner surface of the front windshield for P-polarized light, improve the contrast of the images on the inner and outer surfaces of the front windshield, and thus solve the double image problem.
[0034] Specifically, please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of the wide-view head-up display film of this application.
[0035] As Figure 1 shown, the film includes a substrate layer 10 and a P-polarized light enhanced reflection layer 20 disposed on one side of the substrate layer 10. The P-polarized light enhanced reflection layer 20 includes a silicon layer 201, a high refractive index layer 202, and a low refractive index layer 203 arranged in sequence along the direction away from the substrate layer 10.
[0036] Among them, the refractive index of the high refractive index layer 202 is 2.0 - 2.3, and the refractive index of the low refractive index layer 203 is 1.45 - 1.5.
[0037] In one embodiment, the high refractive index layer 202 can be made of nickel-chromium alloy, and its thickness can be set to 25 - 35 nm. In other embodiments, the high refractive index layer 202 can also be made of other materials that meet the refractive index requirements and light transmittance requirements, and can also achieve the effects of this embodiment.
[0038] In one embodiment, the low refractive index layer 203 can be made of silica, and its thickness can be set to 90 - 110 nm. In other embodiments, the low refractive index layer 203 can also be made of other materials that meet the refractive index requirements and light transmittance requirements, and the effects of this embodiment can also be achieved.
[0039] In one embodiment, the thickness of the silicon layer 201 can be set to 1 - 10 nm.
[0040] In one embodiment, the substrate layer 10 can be made of PET material, and preferably the total light transmittance is greater than or equal to 90%.
[0041] In this application, there is no relevant limitation on the thickness of the substrate layer 10. When applied, the substrate layer 10 is located on the outermost side to protect the P-polarized light enhancement reflection layer 20 inside. The substrate layer 10 with a corresponding thickness can be selected based on actual needs. Exemplarily, the substrate layer 10 can be a PET substrate with a thickness of 100μm, 125μm, or 188μm. Of course, in other embodiments, the substrate layer 10 can also be other resin materials commonly used in the art, such as PC, PMMA, etc.
[0042] In order to improve the mechanical strength of the head-up display film and extend its service life, please refer to Figure 2 , Figure 2 is a schematic structural diagram of another embodiment of the wide-view head-up display film of this application. As Figure 2 shown, in another embodiment, a hardening layer 30 is further arranged between the substrate layer 10 and the P-polarized light enhancement reflection layer 20 of the head-up display film.
[0043] In one embodiment, the thickness of the hardening layer 30 can be 3 - 5μm. In other embodiments, it can also be adjusted accordingly based on actual working conditions as long as the light transmittance requirements are met.
[0044] In this application, there is no limitation on the material of the hardening layer 30. It can be prepared by a wet coating process using any hardening resin material commonly used in the art. Exemplarily, the hardening layer 30 can be obtained by coating and curing a hardening coating of model CHT-X1.
[0045] Based on the head-up display films of the above embodiments, they have a high reflectivity for P-polarized light. After being applied to the inner side of the front windshield 2, on the one hand, it can improve the clarity and brightness of the projected image, and on the other hand, it can increase the contrast between the reflected images on the inner and outer surfaces of the front windshield 2, thereby eliminating the ghosting problem. In particular, since it solves the ghosting problem by increasing the contrast between the reflected images on both sides of the glass, it is applicable to a wide viewing angle and provides better image quality and viewing experience for users.
[0046] In addition, in some embodiments, in order to further enhance the effect of improving the contrast of the reflected images on both sides of the windshield 2 by the above-mentioned head-up display film, one side of the P-polarized light enhanced reflection layer 20 of the head-up display film can be blackened to further enhance the contrast and make the projected image more distinct and clear.
[0047] The present application also provides a windshield. Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of an embodiment of the windshield of the present application.
[0048] As Figure 3 shown, the windshield 2 includes an inner surface and an outer surface arranged oppositely, and the inner surface of the windshield 2 is provided with the wide-view head-up display film 1 of any of the above embodiments.
[0049] Among them, the side of the P-polarized light enhanced reflection layer 20 of the wide-view head-up display film 1 facing away from the substrate layer 10 is adhesively fixed to the inner surface.
[0050] By attaching the wide-view head-up display film 1 of any of the above embodiments to the inner surface of the windshield 2 in this embodiment, the reflectivity of the inner surface to P-polarized light can be effectively improved, and the reflectivity of the outer surface to P-polarized light can be correspondingly reduced, thereby significantly improving the contrast of the reflected images on the front and back sides of the windshield 2 and solving the problem of double images.
[0051] The present application also provides a head-up display system. Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of an embodiment of the head-up display system of the present application.
[0052] As Figure 4 shown, the head-up display system includes a projection light source 3 and the windshield 2 of any of the above embodiments.
[0053] Among them, the inner surface of the windshield 2 is provided with a HUD area; the light emitting end of the projection light source 32 is aligned with the HUD area for emitting P-polarized light to the HUD area.
[0054] The beneficial effects of the technical solution of the present application will be further elaborated in detail below in combination with specific embodiments.
[0055] Example 1:
[0056] A head-up display film includes a PET substrate layer, a hardening coating, a silicon layer, a nickel-chromium alloy layer, and a silica layer arranged in sequence. Among them, the thickness of the PET substrate layer is 125 μm, the hardening coating is obtained by coating with a coating of model CHT-X1, the thickness of the hardening coating is 3 μm, the thickness of the silicon layer is 3 nm, the thickness of the nickel-chromium alloy layer is 30 nm, and the thickness of the silica layer is 100 nm.
[0057] Example 2:
[0058] A head-up display film, comprising a PET substrate layer, a hardening coating, a silicon layer, a nickel-chromium alloy layer, and a silicon dioxide layer arranged in sequence. Among them, the thickness of the PET substrate layer is 125 μm, the hardening coating is obtained by coating with a coating of model CHT-X1, the thickness of the hardening coating is 3 μm, the thickness of the silicon layer is 7 nm, the thickness of the nickel-chromium alloy layer is 30 nm, and the thickness of the silicon dioxide layer is 100 nm.
[0059] Example 3:
[0060] A head-up display film, comprising a PET substrate layer, a hardening coating, a silicon layer, a nickel-chromium alloy layer, and a silicon dioxide layer arranged in sequence. Among them, the thickness of the PET substrate layer is 125 μm, the hardening coating is obtained by coating with a coating of model CHT-X1, the thickness of the hardening coating is 3 μm, the thickness of the silicon layer is 7 nm, the thickness of the nickel-chromium alloy layer is 30 nm, and the thickness of the silicon dioxide layer is 100 nm.
[0061] Example 4:
[0062] A head-up display film, comprising a PET substrate layer, a hardening coating, a silicon layer, a nickel-chromium alloy layer, and a silicon dioxide layer arranged in sequence. Among them, the thickness of the PET substrate layer is 100 μm, the hardening coating is obtained by coating with a coating of model CHT-X1, the thickness of the hardening coating is 5 μm, the thickness of the silicon layer is 1 nm, the thickness of the nickel-chromium alloy layer is 35 nm, and the thickness of the silicon dioxide layer is 110 nm.
[0063] Example 5:
[0064] A head-up display film, comprising a PET substrate layer, a hardening coating, a silicon layer, a nickel-chromium alloy layer, and a silicon dioxide layer arranged in sequence. Among them, the thickness of the PET substrate layer is 188 μm, the hardening coating is obtained by coating with a coating of model CHT-X1, the thickness of the hardening coating is 3 μm, the thickness of the silicon layer is 10 nm, the thickness of the nickel-chromium alloy layer is 25 nm, and the thickness of the silicon dioxide layer is 90 nm.
[0065] Comparative Example 1:
[0066] A head-up display film, comprising a PET substrate layer, a hardening coating, a nickel-chromium alloy layer, and a silicon dioxide layer arranged in sequence. Among them, the thickness of the PET substrate layer is 125 μm, the hardening coating is obtained by coating with a coating of model CHT-X1, the thickness of the hardening coating is 3 μm, the thickness of the nickel-chromium alloy layer is 30 nm, and the thickness of the silicon dioxide layer is 100 nm.
[0067] Effect Example:
[0068] The head-up display films of Example 1, 2 and Comparative Example 1 were respectively bonded to the inner side of the front windshield glass. Among them, the silicon dioxide layer was bonded to the front windshield glass through an optical adhesive.
[0069] Using a projection light source, P-polarized light is projected onto the inner side surface of the front windshield glass with the film of Example 1 attached at incident angles of 40° and 60° respectively. The reflectance of the inner and outer surfaces of the front windshield glass for P-polarized light is detected by a reflectance detector; at the same time, the front windshield glass without the head-up display film attached is used as a control to detect the reflectance of its inner and outer surfaces for P-polarized light, and Figure 5 and Figure 6 .
[0070] Please refer to Figure 5 and Figure 6 , Figure 5 is the reflectance curve of the inner side surface of the front windshield glass with the head-up display film of Example 1 attached for P-polarized light, Figure 6 is the reflectance curve of the inner and outer side surfaces of the front windshield glass without the head-up display film attached for P-polarized light.
[0071] As Figure 6 shown, at a 40° angle, the average reflectances of the inner and outer surfaces of the uncoated glass for P-polarized light are 4.83% and 4.2% respectively, and the contrast ratio is only 1.2, and the double image phenomenon will be very obvious, affecting the driver's viewing experience; at a 60° angle, the average reflectances of the inner and outer surfaces of the uncoated glass for P-polarized light are 9.23% and 6.4%, and the contrast ratio is only 1.5, and the double image phenomenon will be very obvious, affecting the driver's viewing experience.
[0072] As Figure 5 shown, at a 40° angle, the average reflectance of P-polarized light on the inner surface of the front windshield glass after film application is 18.13%, and the reflectance of P-polarized light on the outer surface is 0.11%. At this time, the contrast ratio exceeds 100, and there is almost no double image; at a 60° angle, the average reflectance of P-polarized light on the inner surface of the front windshield glass after film application is 22.04%, and the reflectance of P-polarized light on the outer surface is close to 0. At this time, only one beam of light reaches the human eye, and the double image can be completely eliminated.
[0073] From the above data, it can be seen that the head-up display film of Example 1 can significantly increase the reflectance of the inner surface of the glass for P-polarized light and correspondingly reduce the reflectance of the outer surface of the glass for P-polarized light, and can improve the double image phenomenon to the greatest extent.
[0074] Furthermore, using a projection light source, P-polarized light is projected onto the inner side surface of the front windshield glass with the films of Example 2 and Comparative Example 1 attached at an incident angle of 60° respectively. The reflectance of the inner surface of the front windshield glass for P-polarized light is detected by a reflectance detector, and Figure 7 , Figure 7 is the reflectance curve of the inner side surface of the front windshield glass with the films of Example 1, 2 and Comparative Example 1 attached for P-polarized light at an incident angle of 60°.
[0075] As Figure 7As shown, at an incident angle of 60°, the average reflectance of P-polarized light on the inner surface of the front windshield glass with the films of Example 1, Example 2, and Comparative Example 1 attached is 22.04%, 26.06%, and 18.75% respectively. It can be seen that the reflectance increases significantly after adding the silicon layer, and the reflectance increases with the increase in the thickness of the silicon layer. At the same time, since there is no silicon layer primer in Comparative Example 1, the adhesion of the coating is very poor and cannot meet the process requirements.
[0076] Among them, at an angle of 60°, the average reflectance of P-polarized light on the inner surface of the front windshield glass after applying the film is 26.06%, and the reflectance of P-polarized light on the outer surface is close to 0. At this time, only one beam of light reaches the human eye, and the ghosting can be completely eliminated.
[0077] Based on the above effect examples, it can be seen that the head-up display film of the present application can significantly increase the reflectance of P-polarized light on the inner surface of the front windshield glass, improve the contrast of the reflected images on both sides of the front windshield glass, and effectively solve the ghosting problem.
[0078] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.
[0079] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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 wide viewing angle head-up display film, characterized in that, Comprising: A substrate layer; A P-polarized light enhanced reflection layer disposed on one side of the substrate layer, the P-polarized light enhanced reflection layer including a silicon layer, a high refractive index layer, and a low refractive index layer sequentially arranged in a direction away from the substrate layer; Wherein, the refractive index of the high refractive index layer is 2.0 - 2.3, and the refractive index of the low refractive index layer is 1.45 - 1.
5.
2. The wide-view head-up display film according to claim 1, wherein The high refractive index layer is a nickel-chromium alloy layer, and the thickness of the high refractive index layer is 25 - 35 nm.
3. The wide-view head-up display film according to claim 1, wherein The low refractive index layer is a silicon dioxide layer, and the thickness of the low refractive index layer is 90 - 110 nm.
4. The wide viewing angle head-up display film according to claim 1, wherein The thickness of the silicon layer is 1 - 10 nm.
5. The wide viewing angle head-up display film according to claim 1, wherein The substrate layer is a PET substrate layer, and the total light transmittance of the substrate layer is greater than or equal to 90%.
6. The wide-view head-up display film according to claim 1, characterized in that, It further includes a hardening layer, and the hardening layer is disposed between the substrate layer and the P-polarized light enhanced reflection layer.
7. The wide-view head-up display film according to claim 6, wherein, The thickness of the hardening layer is 3 - 5 μm.
8. A windshield, characterized in that, Comprising an inner surface and an outer surface arranged opposite to each other, the inner surface is provided with the wide-view head-up display film according to any one of claims 1 to 7, and the side of the P-polarized light enhanced reflection layer of the wide-view head-up display film away from the substrate layer is adhesively fixed to the inner surface.
9. The front windshield according to claim 8, wherein, After the inner surface of the front windshield glass is attached to the wide-view head-up display film, the average reflectivity of the P-polarized light incident at an angle of 40° in the spectral range of 400 - 700 nm is greater than 18%, and the average reflectivity of the P-polarized light incident at an angle of 60° is greater than 22%.
10. A head-up display system, characterized in that, Comprising: The front windshield glass according to claim 8 or 9, with an HUD area provided on the inner surface; A projection light source, the light emitting end of which is aligned with the HUD area, and the projection light source is used to emit P-polarized light to the HUD area.