P-light transparent nano reflecting film, front windshield and head-up display system

Abstract

The utility model discloses a P-light transparent nano reflecting film, a front windshield and a head-up display system. The reflecting film comprises a base material layer, and a hardening layer, a first niobium oxide coating, a first zinc aluminum oxide coating, a silver coating, a nickel-chromium coating, a second zinc aluminum oxide coating and a second niobium oxide coating which are sequentially formed on one side of the base material layer, and when the thickness of the nickel-chromium plating layer is not more than 2nm, the thickness of the silver plating layer is 10-14nm. According to the utility model, the structure is simple, the p-light reflection on the inner surface is effectively eliminated, ghosting can be weakened or eliminated under a large visual angle, and clear images with enough brightness can be provided for a driver.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the head-up display technical field, concretely relates to a P light transparent nanometer reflection film, front windshield glass and head-up display system. BACKGROUND

[0002] AR-HUD is the front field of the development of vehicle HUD, and is the only way for the development of vehicle HUD. The first generation of AR-HUD has taken shape, but it still has a long way to go to meet people's expectations and imagination. At present, the core difficulty that prevents the development of AR-HUD is algorithm fusion, the fusion of virtual and reality, which is a very challenging task for algorithms. In addition, ghosting caused by the reflection of the front windshield glass is also a problem that needs to be solved.

[0003] At present, after years of research and development, the ghosting problem has been greatly improved. People have effectively improved the ghosting problem through wedge-shaped PVB film, P light transparent nanometer reflection film and other methods. However, under a large viewing angle, the ghosting phenomenon is still obvious. The realization of AR-HUD technology not only depends on algorithm fusion, but also the entire front windshield glass without ghosting is an important indicator of its performance. The wedge-shaped PVB film uses a sandwich structure to sandwich PVB glue between two pieces of glass as a front cover. By adjusting the shape of the PVB film to design a wedge angle, the two images of ghosting are superimposed by using the wedge angle, thereby eliminating ghosting. However, the visible area of this scheme is limited, and when the viewing angle is large, the ghosting phenomenon is still obvious. The P light transparent nanometer reflection film uses Brewster's angle to reduce the reflection of P light from the projection unit and the first interface of the glass to near zero. The transmitted light is reflected into the eye through the P light reflection film, thereby eliminating ghosting. However, when the incident angle is within a certain range above and below the Brewster angle, the brightness of the P light reflection image will be less than 1% of the original image, that is, the imaging brightness may be affected.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a P light transparent nanometer reflection film, a sandwich structure and a HUD device.

[0005] The information disclosed in this BACKGROUND section is only intended to increase an understanding of the general background of the present application, and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is already known to those of ordinary skill in the art. SUMMARY

[0006] The utility model aims at providing a P light transparent nanometer reflection film, a front windshield glass and a head-up display system, which are used to solve the problem of ghosting in the existing head-up display system under a large viewing angle.

[0007] In order to achieve the above-mentioned purpose, the technical scheme provided by the utility model in one specific embodiment is as follows:

[0008] The P light transparent nano reflective film is used for reflecting P polarized light in the middle of the laminated glass of the front windshield of the automobile, and comprises a substrate layer, and sequentially formed on one side of the substrate layer: a hardening layer, a first niobium oxide plating layer, a first zinc aluminum oxide plating layer, a silver plating layer, a nickel chromium plating layer, a second zinc aluminum oxide plating layer and a second niobium oxide plating layer; wherein when the thickness of the nickel chromium plating layer is not more than 2nm, the thickness of the silver plating layer is 10-14nm.

[0009] In one or more embodiments of the utility model, the thickness of the nickel chromium plating layer is 0.1-2nm.

[0010] In one or more embodiments of the utility model, the thickness of the first niobium oxide plating layer is 10-30nm.

[0011] In one or more embodiments of the utility model, the thickness of the first zinc aluminum oxide plating layer is 10-30nm.

[0012] In one or more embodiments of the utility model, the thickness of the second zinc aluminum oxide plating layer is 40-80nm.

[0013] In one or more embodiments of the utility model, the thickness of the second niobium oxide plating layer is 10-30nm.

[0014] In one or more embodiments of the utility model, the substrate is a high molecular substrate film with a total light transmittance of 90%.

[0015] In one or more embodiments of the utility model, the substrate is a PET (polyethylene terephthalate) substrate film with a thickness of 50-188μm or a TAC (triacetyl cellulose) substrate film with a thickness of 60-80μm.

[0016] In one or more embodiments of the utility model, the front windshield glass comprises: inner glass, outer glass, and the P light transparent nano reflective film as described above arranged between the inner glass and the outer glass, wherein the substrate layer is close to the outer glass side, the silver plating layer is close to the inner glass side, and a wedge-shaped PVB film is arranged between the reflective film and the inner glass.

[0017] In one or more embodiments of the utility model, the head-up display system comprises the front windshield glass as described above and a projection light source, the projection light source is used for projecting P polarized light to the front windshield glass, the included angle α between the projected P polarized light and the normal line of the front windshield glass is 55°-60°, the average reflectivity of the reflective film to the P polarized light with the above incident angle is 17% or more, and the imaging brightness of the reflected P polarized light is 350nit or more.

[0018] Compared with the prior art, the P light transparent nano reflective film, the front windshield and the head-up display system have the advantages that the P light transparent nano reflective film is applied in the interlayer of the front windshield, specifically, is pasted on the rear surface of the wedge-shaped PVB film, that is, the surface far away from the cab, light emitted by the light source (P light machine) is emitted to the inner surface of the glass at Brewster angle, the P light reflectivity of the surface is almost zero, the light passing through the PVB film reaches the P light reflective film, and finally reaches the human eye through reflection. The ghosting can be weakened or eliminated under a large viewing angle, a clear and bright enough image can be provided for the driver, and an option can be provided for the development of the AR-HUD. BRIEF DESCRIPTION OF DRAWINGS

[0019] 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 needed to be used in the embodiments or the prior art description. Obviously, the drawings described in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 It is a film layer structure schematic view of the P light transparent nano reflective film in an embodiment of the present application.

[0021] Figure 2 It is a structure principle view of the head-up display system in an embodiment of the present application.

[0022] Figure 3 It is a reflectivity curve view of the light on the inner glass surface under different incident angles in an embodiment of the present application.

[0023] Figure 4 It is a reflectivity curve view of the light on the outer glass surface under different incident angles in an embodiment of the present application.

[0024] The list of reference signs: 1, base material layer; 2, hardening layer; 3, first niobium oxide plating layer; 4, first zinc aluminum oxide plating layer; 5, silver plating layer; 6, nickel chromium plating layer; 7, second zinc aluminum oxide plating layer; 8, second niobium oxide plating layer; 9, projection light source; 11, inner glass; 12, wedge-shaped PVB film; 13, reflective film; 14, outer glass. DETAILED DESCRIPTION

[0025] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions of the present application will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0026] The utility model provides a kind of P light transparent nanometer reflection film, as shown in Figure 1 It includes substrate layer 1, and sequentially formed on substrate layer 1: hardening layer 2, first niobium oxide plating layer 3, first zinc-aluminum oxide plating layer 4, silver plating layer 5, nickel-chromium plating layer 6, second zinc-aluminum oxide plating layer 7, second niobium oxide plating layer 8;Wherein when the thickness of nickel-chromium plating layer is not more than 2nm, the thickness of silver plating layer is 10-14nm.

[0027] The substrate layer 1 can be PET substrate, and the thickness can be selected to be 50 μm, 100 μm, 125 μm or 188 μm;It can also be TAC substrate, and the thickness can be selected to be 60 μm or 80 μm.

[0028] Specifically, the preparation method of the reflection film provided by the utility model can be realized as follows: first, a hardening layer 2 (HC Hard-Coating, coating liquid can be selected from model: Gawa Chemical, model CHT-X1) is coated on the substrate layer 1 by precision coating process, and the thickness is 3-5 μm; after coating is completed, first niobium oxide plating layer 3, first zinc-aluminum oxide plating layer 4, silver plating layer 5, nickel-chromium plating layer 6, second zinc-aluminum oxide plating layer 7 and second niobium oxide plating layer 8 are sequentially plated on the hardening layer 2 using magnetron sputtering process, and the reflection film described in the utility model can be completed.

[0029] The thickness of the first niobium oxide plating layer 3 is 10nm-30nm, the thickness of the first zinc-aluminum oxide plating layer 4 is 10nm-30nm, the thickness of the silver plating layer 5 is 10nm-14nm, the thickness of the nickel-chromium plating layer 6 is 0.1nm-2nm, the thickness of the second zinc-aluminum oxide plating layer 7 is 40nm-80nm, and the thickness of the second niobium oxide plating layer 8 is 10nm-30nm.

[0030] It should be noted that no matter PET substrate or TAC substrate, the surface hardness is poor, so a hard layer needs to be coated on the surface of the substrate, and the oxide layer is plated between the silver plating layer and the hard layer, which can not only enhance the adhesion between the metal layer and the organic hard layer, but also not affect the optical performance of the whole plating film, and the main role of the first niobium oxide plating layer 3 and the first zinc-aluminum oxide plating layer 4 is to enhance the adhesion between the metal layer (silver plating layer 5) and the organic hard layer (hard layer 2) while not affecting the optical performance. The optical performance of the reflective film provided by the utility model mainly depends on the silver plating layer 5, and the thickness of the silver plating layer 5 directly determines the reflectivity of the reflective film to P light, so the silver plating layer 5 mainly plays a reflecting role. However, the main material of the silver plating layer 5 is silver, and the metal silver is easily oxidized in the air, and the oxidized silver is black, which greatly affects the light transmittance and reflectivity, so in order to prevent the silver plating layer 5 from being oxidized in the subsequent plating process (mainly the plating of the second zinc-aluminum oxide plating layer 7 and the second niobium oxide plating layer 8 needs to pass oxygen), a nickel-chromium plating layer 6 needs to be plated above the silver plating layer 5, but since the nickel-chromium plating layer 6 has a large absorption to light, the nickel-chromium plating layer 6 should not be too thick, generally not more than 2nm, and it has been verified that the suitable thickness of the silver plating layer 5 is 10-14nm when the nickel-chromium plating layer 6 is not more than 2nm

[0031] Further, in order to improve the weather resistance of the reflective film, the second zinc-aluminum oxide plating layer 7 and the second niobium oxide plating layer 8 are added and the thickness is designed, and the main role is to protect the reflective film layer from corrosion while not affecting the optical performance of the whole reflective film, so as to improve the weather resistance.

[0032] The utility model also provides a front windshield, the front windshield is a wedge-shaped glass, mainly includes: inner glass 11, outer glass 14 is located between the inner glass and the outer glass P light transparent nanometer reflective film 13 is arranged between the inner glass and the outer glass, wherein, the substrate layer 1 is close to the outer glass side, the silver plating layer is close to the inner glass side, and the wedge-shaped PVB film 12 is arranged between the reflective film and the inner glass, the reflective film provided by the utility model is applied to the interlayer of the whole front windshield, and cooperates with the wedge-shaped PVB film 12 to form a wedge-shaped glass Figure 2 As shown in the application scenario.

[0033] The utility model also provides a head-up display system, as shown in Figure 2As shown, the system includes a windshield and a projection light source 9. The projection light source 9 projects P-polarized light onto the windshield. The angle α between the projected P-polarized light and the normal of the windshield is 55°-60°. The reflective film has an average reflectivity of over 17% for P-polarized light at the aforementioned incident angle, and the image brightness after reflection of the P-polarized light is over 350 nits. Specifically, the projection light source 9 (P-optical engine) emits P-polarized light that enters the first surface of the inner glass 11 at a Brewster angle. In this scheme, the incident angle of the P-polarized light is 55°-60° (e.g., ...). Figure 2 The angle α between the P-polarized light and the normal of the windshield is shown in the figure. Since the reflectivity of glass for P-polarized light is almost zero, the P-polarized light that is not reflected on the first surface is almost entirely transmitted. Since the glass is made of resin and the reflective film is also mainly made of resin, the entire windshield can be considered as a single material, and the light does not refract (the actual refraction is negligible). At this time, the angle after the incident light enters the glass from the air and is refracted is calculated to be about 30°-35°. The reflective film in this invention has a reflectivity of more than 17% for P-polarized light with an incident angle of 30°-35°. The light passes through the reflective film 13, reflecting part of the light and transmitting part of the light. The reflected light is refracted and enters the human eye. The transmitted light passes through the surface of the outer glass 14. At this time, the reflectivity of the glass for light is almost zero, so it can be understood as fully transmitted. In summary, only the light reflected by the reflective film 13 enters the human eye, and the light from the front and rear surfaces of the glass is fully transmitted, thus preventing the ghosting problem.

[0034] It is worth noting that two Brewster angles will appear in the above: First: as shown Figure 3 As shown, the reflectivity of the inner glass surface (optically less dense medium entering optically denser medium: air entering glass) at an incident angle of approximately 57° is almost zero; secondly: as Figure 4 As shown, the reflectivity of the outer glass surface (from an optically denser medium to an optically less dense medium: from glass to air) is 0 at an incident angle of approximately 33°. The Brewster angles corresponding to 0 reflectivity for an optically less dense medium entering an optically denser medium and for an optically denser medium entering an optically less dense medium are different.

[0035] The image brightness of a HUD is a very important indicator. Currently, the brightness of the light emitted by the optical engine of an AR-HUD is generally in the range of 10,000-15,000 nits, while the human eye's comfortable range for light brightness is generally above 200 nits. Theoretically, the image brightness of a car windshield is the brightness emitted by the optical engine multiplied by the square of the reflectivity of the P-light reflective film for P-light, i.e., image brightness = optical engine brightness × P-light reflectivity. 2 Based on the brightness emitted by current mainstream AR-HUD optical engines, which is generally 12000 nits, the applicability of the thin film of this utility model in terms of reflectivity is calculated.

[0036] The AR-HUD not only can see the front screen information, but also can see the real-time road conditions, which is the premise of the use of the HUD, and thus the transmittance of the P light reflection film is a fundamental index of the HUD, and it is generally considered that the superposition transmittance of the front screen is greater than or equal to 70%.

[0037] The utility model discloses a reflection film layer design, and the reasonable design of incident angle guarantees the good effect of large angle vehicle-mounted head-up display.

[0038] In order to better embody the technical effect of the utility model, the following specific implementation scheme is used to elaborate the present application in detail:

[0039] Embodiment 1:

[0040] The substrate layer 1 of the embodiment is selected as polyethylene terephthalate (PET), the thickness is selected as 125 mu m, the thickness of the hard layer 2 is selected as 3 mu m, the thickness of the first niobium oxide plating layer 3 is 15 nm, the thickness of the first zinc aluminum oxide plating layer 4 is 15 nm, the thickness of the silver plating layer 5 is 14 nm, the thickness of the nickel-chromium plating layer 6 is 0.5 nm, the thickness of the second zinc aluminum oxide plating layer 7 is 60 nm, and the thickness of the second niobium oxide plating layer 8 is 15 nm.

[0041] The incident angle alpha of the P polarized light is 60 degrees, the P light reflectivity of the incident light on the surface of the reflection film 13 is 34.8%, the imaging brightness is 1453 nit, and the projection information with sufficient brightness can be provided; the superposition transmittance of the glass and the film is 70.0%, and the driver's observation of the road condition information is not affected.

[0042] Embodiment 2:

[0043] The substrate layer 1 of the embodiment is selected as polyethylene terephthalate (PET), the thickness is selected as 188 mu m, the thickness of the hard layer 2 is selected as 3 mu m, the thickness of the first niobium oxide plating layer is 15 nm, the thickness of the first zinc aluminum oxide plating layer is 15 nm, the thickness of the silver plating layer 5 is 12 nm, the thickness of the nickel-chromium plating layer 6 is 0.5 nm, the thickness of the second zinc aluminum oxide plating layer 7 is 60 nm, and the thickness of the second niobium oxide plating layer 8 is 15 nm.

[0044] The incident angle alpha of the P polarized light emitted by the projection light source 9 (P light machine) is 60 degrees, the P light reflectivity of the incident light on the surface of the reflection film 13 is 28.6%, the imaging brightness is 982 nit, and the projection information with sufficient brightness can be provided; the superposition transmittance of the glass and the film is 75.7%, and the driver's observation of the road condition information is not affected.

[0045] Embodiment 3:

[0046] The substrate layer 1 of the embodiment is selected as polyethylene terephthalate (PET) with a thickness of 50 μm, the thickness of the hardening layer 2 is selected as 3 μm, the thickness of the first niobium oxide plating layer is 15 nm, the thickness of the first zinc-aluminum oxide plating layer is 15 nm, the thickness of the silver plating layer 5 is 10 nm, the thickness of the nickel-chromium plating layer 6 is 0.5 nm, the thickness of the second zinc-aluminum oxide plating layer 7 is 60 nm, and the thickness of the second niobium oxide plating layer 8 is 15 nm.

[0047] The incident angle a of the P-polarized light emitted by the projection light source 9 (P light machine) is 60°, the P light reflectivity of the incident light on the surface of the reflective film 13 is measured as 22.5%, the imaging brightness is 608 nit, and the projection information with sufficient brightness can be provided; the superposition transmittance of the glass and the film is 81.1%, and the driver's observation of the road condition information is not affected.

[0048] Embodiment 4

[0049] The substrate layer 1 of the embodiment is selected as triacetate cellulose (TAC) with a thickness of 80 μm, the thickness of the hardening layer 2 is selected as 3 μm, the thickness of the first niobium oxide plating layer is 15 nm, the thickness of the first zinc-aluminum oxide plating layer is 15 nm, the thickness of the silver plating layer 5 is 12 nm, the thickness of the nickel-chromium plating layer 6 is 1.5 nm, the thickness of the second zinc-aluminum oxide plating layer 7 is 60 nm, and the thickness of the second niobium oxide plating layer 8 is 15 nm.

[0050] The incident angle a of the P-polarized light emitted by the projection light source 9 (P light machine) is 60°, the P light reflectivity of the incident light on the surface of the reflective film 13 is measured as 27.1%, the imaging brightness is 881 nit, and the projection information with sufficient brightness can be provided; the superposition transmittance of the glass and the film is 72.7%, and the driver's observation of the road condition information is not affected.

[0051] Embodiment 5

[0052] The substrate layer 1 of the embodiment is selected as triacetate cellulose (TAC) with a thickness of 60 μm, the thickness of the hardening layer 2 is selected as 3 μm, the thickness of the first niobium oxide plating layer is 15 nm, the thickness of the first zinc-aluminum oxide plating layer is 15 nm, the thickness of the silver plating layer 5 is 10 nm, the thickness of the nickel-chromium plating layer 6 is 1.5 nm, the thickness of the second zinc-aluminum oxide plating layer 7 is 60 nm, and the thickness of the second niobium oxide plating layer 8 is 15 nm.

[0053] The incident angle a of the P-polarized light emitted by the projection light source 9 (P light machine) is 60°, the P light reflectivity of the incident light on the surface of the reflective film 13 is measured as 21.4%, the imaging brightness is 550 nit, and the projection information with sufficient brightness can be provided; the superposition transmittance of the glass and the film is 77.9%, and the driver's observation of the road condition information is not affected.

[0054] Embodiment 6

[0055] The difference between this embodiment and embodiment 5 is only that the incident angle a of the P-polarized light emitted by the projection light source 9 (P light machine) is 55°, the P light reflectivity of the incident light on the surface of the reflective film 13 is measured to be 17.2%, the imaging brightness is 355 nit, and the projection information with sufficient brightness can be provided; the superposition transmittance of the glass and the film is 77.9%, which does not affect the driver to observe the road condition information.

[0056] Embodiment 7

[0057] The difference between this embodiment and embodiment 5 is only that the incident angle a of the P-polarized light emitted by the projection light source 9 (P light machine) is 58°, the P light reflectivity of the incident light on the surface of the reflective film 13 is measured to be 19.5%, the imaging brightness is 456 nit, and the projection information with sufficient brightness can be provided; the superposition transmittance of the glass and the film is 77.9%, which does not affect the driver to observe the road condition information.

[0058] Comparative Example 1

[0059] The substrate layer 1 of this comparative example is selected to be polyethylene terephthalate (PET) with a thickness of 125 μm, the hard layer 2 has a thickness of 3 μm, the first niobium oxide plating layer has a thickness of 15 nm, the first zinc aluminum oxide plating layer has a thickness of 15 nm, the silver plating layer 5 has a thickness of 12 nm, the nickel-chromium plating layer 6 has a thickness of 3 nm, the second zinc aluminum oxide plating layer 7 has a thickness of 60 nm, and the second niobium oxide plating layer 8 has a thickness of 15 nm. The incident angle a of the P-polarized light emitted by the projection light source 9 (P light machine) is 60°, and the superposition transmittance of the glass and the reflective film is measured to be 68.4%. Due to the too large absorption of the nickel-chromium plating layer to light, the transmittance is insufficient, which will affect the driver to observe the road condition information.

[0060] Comparative Example 2

[0061] The substrate layer 1 of this comparative example is selected to be polyethylene terephthalate (PET) with a thickness of 125 μm, the hard layer 2 has a thickness of 3 μm, the first niobium oxide plating layer has a thickness of 15 nm, the first zinc aluminum oxide plating layer has a thickness of 15 nm, the silver plating layer 5 has a thickness of 12 nm, the nickel-chromium plating layer 6 has a thickness of 0, the second zinc aluminum oxide plating layer 7 has a thickness of 60 nm, and the second niobium oxide plating layer 8 has a thickness of 15 nm. The incident angle a of the P-polarized light emitted by the projection light source 9 (P light machine) is 60°, and the film environmental test effect is very poor, and the film layer falls off after only 4 h.

[0062] Comparative Example 3

[0063] The substrate layer 1 of the present comparative example is selected as polyethylene terephthalate (PET) with a thickness of 125 μm, the thickness of the hard layer 2 is selected as 3 μm, the thickness of the first niobium oxide plating layer is 15 nm, the thickness of the first zinc aluminum oxide plating layer is 15 nm, the thickness of the silver plating layer 5 is 5 nm, the thickness of the nickel-chromium plating layer 6 is 0.5 nm, the thickness of the second zinc aluminum oxide plating layer 7 is 60 nm, and the thickness of the second niobium oxide plating layer 8 is between 15 nm. The incident angle α of the P-polarized light emitted by the projection light source 9 (P-light machine) is 60°, the P-light reflectivity of the incident light on the film surface is 8.9%, the imaging brightness is 95 nit, and the projection information with sufficient brightness cannot be provided.

[0064] Comparative Example 4:

[0065] The substrate layer 1 of the present comparative example is selected as polyethylene terephthalate (PET) with a thickness of 125 μm, the thickness of the hard layer 2 is selected as 3 μm, the thickness of the first niobium oxide plating layer is 15 nm, the thickness of the first zinc aluminum oxide plating layer is 15 nm, the thickness of the silver plating layer 5 is 20 nm, the thickness of the nickel-chromium plating layer 6 is 0.5 nm, the thickness of the second zinc aluminum oxide plating layer 7 is 60 nm, and the thickness of the second niobium oxide plating layer 8 is between 15 nm. The incident angle α of the P-polarized light emitted by the projection light source 9 (P-light machine) is 60°, the measured superposition transmittance of the glass and the film is 44.9%, the transmittance is seriously insufficient, and the driver's observation of road condition information will be affected.

[0066] The reflectivity, transmittance and brightness of the above-mentioned examples 1-7 and comparative examples 1-4 are tested and calculated respectively, and the specific values are shown in the following table:

[0067] Test method:

[0068] Reflectivity test: Olympus tester.

[0069] Transmittance test: haze meter tester.

[0070] Brightness calculation: brightness = light machine brightness × P-light reflectivity 2 .

[0071]

[0072] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the examples should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0073] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A P light transparent nano reflective film, said reflective film acting in the automotive front windshield laminated glass interlayer for reflecting P polarized light, characterized in that, The hardening layer, the first niobium oxide plating layer, the first zinc-aluminum oxide plating layer, the silver plating layer, the nickel-chromium plating layer, the second zinc-aluminum oxide plating layer and the second niobium oxide plating layer are sequentially formed on one side of the substrate layer, wherein the thickness of the silver plating layer is 10-14 nm when the thickness of the nickel-chromium plating layer is not more than 2 nm.

2. The P-light transparent nanoreflective film according to claim 1, wherein The thickness of the nickel-chromium plating layer is 0.1-2 nm.

3. The P-light transparent nanoreflective film according to claim 1, wherein The thickness of the first niobium oxide plating layer is 10-30 nm.

4. The P-light transparent nanoreflective film according to claim 1, wherein The thickness of the first zinc-aluminum oxide plating layer is 10-30 nm.

5. The P-light transparent nanoreflective film according to claim 1, wherein The thickness of the second zinc-aluminum oxide plating layer is 40-80 nm.

6. The P-light transparent nanoreflective film according to claim 1, wherein The thickness of the second niobium oxide plating layer is 10-30 nm.

7. The P-light transparent nanoreflective film according to claim 1, wherein The substrate layer is a polymer substrate film with a total light transmittance of 90%.

8. The P-light transparent nanoreflective film according to claim 7, wherein, The substrate layer is a PET substrate film with a thickness of 50-188 μm or a TAC substrate film with a thickness of 60-80 μm.

9. Front windshield, characterized in that The front windshield glass comprises: The inner glass, the outer glass and the P light transparent nano reflective film as claimed in any one of claims 1-8 between the inner glass and the outer glass, wherein the substrate layer is close to the outer glass side, the silver plating layer is close to the inner glass side, and a wedge-shaped PVB film is arranged between the reflective film and the inner glass.

10. A heads-up display system characterized by, The front windshield glass as claimed in claim 9 and a projection light source for projecting P polarized light to the front windshield glass, wherein the included angle a between the projected P polarized light and the normal line of the front windshield glass is 55°-60°, the average reflectivity of the reflective film to the P polarized light with the above incident angle is more than 17%, and the imaging brightness after the reflection of the P polarized light is more than 350 nit.

Images