Head-up display silver film, front windshield and head-up display system

Abstract

The utility model discloses a head-up display silver film, a front windshield and a head-up display system, the head-up display silver film comprises a base material layer, and one side of the base material layer is provided with a coating layer prepared through a magnetron sputtering coating technology. The coating layer comprises a first high-refractive-index layer, a silver layer, a second high-refractive-index layer and a third high-refractive-index layer which are stacked in sequence; wherein the silver layer is arranged between the first high refractive index layer and the second high refractive index layer, and the thickness of the silver layer is 15-20 nm. The head-up display silver film can effectively reflect P polarized light, so that projected images are clearer and higher in brightness, and the problem of ghosting is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of head-up display, and in particular relates to a head-up display silver film, a windshield and a head-up display system. Background Art

[0002] Head-up display (HUD) is a technology that projects vehicle information directly into the driver's field of view. It can project information such as vehicle speed, navigation instructions, and driver assistance systems directly onto the windshield, allowing the driver to access this information while simultaneously observing the road. However, HUD also has its drawbacks, including a common phenomenon called ghosting, which significantly impacts the viewing experience.

[0003] A common solution to eliminating ghosting is to use a wedge-shaped PVB film on the windshield. Windshields are constructed with two layers of glass sandwiched between a layer of PVB film. While the PVB film on standard windshields is typically uniform across the top and bottom, modifying the film into a wedge shape shifts the traditional "uniform thickness" to "thick at the top and thin at the bottom," creating a three-dimensional wedge angle and, in turn, giving the windshield a "thick at the top and thin at the bottom" appearance. Light refracted from the first surface of the glass changes its reflection height and angle upon reaching the second surface, causing the two virtual images formed by the incident light on the first and second surfaces to overlap, thereby reducing ghosting.

[0004] However, the method of using wedge-shaped PVB film also has some disadvantages. The complete elimination of ghosting requires precise optics and wedge angles, but there are cumulative tolerances in actual production, and the ghosting and main image cannot be completely overlapped. In addition, the cost of customized wedge-shaped PVB film is also relatively high.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0006] The purpose of the present invention is to provide a head-up display silver film, a windshield and a head-up display system. The head-up display silver film in the present invention can effectively reflect P-polarized light and solve the ghosting problem.

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A head-up display silver film, which acts on the middle of the laminated glass of an automobile windshield to reflect P-polarized light, comprises a substrate layer, one side of which is provided with a coating layer prepared by a magnetron sputtering coating process, the coating layer comprising a first high refractive index layer, a silver layer, a second high refractive index layer, and a third high refractive index layer stacked in sequence; wherein the silver layer is provided between the first high refractive index layer and the second high refractive index layer, and the thickness of the silver layer is 15 to 20 nm.

[0009] In one or more embodiments of the present invention, the first high refractive index layer is a nickel-chromium alloy layer with a thickness of 10 to 20 nm.

[0010] In one or more embodiments of the present invention, the second high refractive index layer is a nickel-chromium alloy layer with a thickness of 2 to 6 nm.

[0011] In one or more embodiments of the present invention, the third high refractive index layer is a niobium oxide layer with a thickness of 30 to 45 nm.

[0012] In one or more embodiments of the present invention, a hard coating layer is further provided between the substrate layer and the first high refractive index layer, and the thickness of the hard coating layer is 3 to 5 μm.

[0013] In one or more embodiments of the present invention, the hard coating layer is an acrylic resin layer.

[0014] In one or more embodiments of the present invention, the substrate layer is a PET layer.

[0015] Another specific embodiment of the present invention provides a technical solution as follows:

[0016] A windshield comprising a glass body, the glass body comprising an inner glass, an outer glass, and the aforementioned head-up display silver film disposed between the inner and outer glass, wherein an adhesive layer is provided on a side of a substrate layer of the head-up display silver film facing away from the coating layer, the head-up display silver film being adhered to the inner surface of the outer glass via the adhesive layer, with the coating layer facing the inner glass.

[0017] Another specific embodiment of the present invention provides a technical solution as follows:

[0018] A head-up display system includes the above-mentioned windshield and a projection light source. The inner surface of the windshield is provided with a head-up display area. The projection light source is used to emit P-polarized light to the head-up display area. The incident angle of the P-polarized light is 45° to 75°.

[0019] In one or more embodiments of the present invention, the incident angle is the angle between the incident light of the P-polarized light and the normal of the windshield.

[0020] Compared with the existing technology, the utility model has a silver layer in the head-up display silver film, which has excellent environmental test resistance performance. The performance of the head-up display silver film remains unchanged after the test. Although silver has a certain cost, it is low in cost compared with the wedge-shaped PVB film, has high roll-to-roll film forming efficiency, and is applicable to a wide range of vehicle models.

[0021] The head-up display silver film has a high reflectivity for P-polarized light, making the projection clearer and brighter, which helps improve the visibility and comfort of the driver when viewing the HUD display content.

[0022] When the HUD silver film is applied to the windshield, the reflectivity of the outer surface of the glass for P-polarized light is almost zero, minimizing ghosting. Painting the back of the film black further eliminates ghosting. Furthermore, it provides clearer images and greater comfort for drivers wearing polarized sunglasses. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of a head-up display silver film in one embodiment of the present utility model;

[0025] Figure 2 Schematic diagram of the incident angle and reflection angle of P-polarized light in one embodiment of the present invention;

[0026] Figure 3 This is a reflection curve of a head-up display silver film when the P light machine in Example 1 emits light at 45 degrees;

[0027] Figure 4 This is a reflection curve of a head-up display silver film when the P light machine in Example 1 emits light at 50°;

[0028] Figure 5 This is a reflection curve of a head-up display silver film when the P light machine in Example 1 emits light at 55°;

[0029] Figure 6 This is a reflection curve of a head-up display silver film when the P light machine in Example 1 emits light at 60°;

[0030] Figure 7 This is a reflection curve of a head-up display silver film when the P light machine in Example 1 emits light at 65°;

[0031] Figure 8 This is a reflection curve of a head-up display silver film when the P light machine in Example 1 emits light at 70°;

[0032] Figure 9 This is a reflection curve of a head-up display silver film when the P light machine in Example 1 emits light at 75°;

[0033] Figure 10 This is the reflection curve of a head-up display silver film when the P light machine emits 60° light in Example 2;

[0034] Figure 11 This is the reflection curve of a head-up display silver film when the P light machine in Example 3 emits 60° light.

[0035] Description of main reference numerals:

[0036] 1. Base material layer; 2. Hard coating layer; 3. First high refractive index layer; 4. Silver layer; 5. Second high refractive index layer; 6. Third high refractive index layer. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0038] A specific embodiment of the present invention provides a head-up display silver film, such as Figure 1 As shown, it includes a substrate layer 1, on which a hard coating layer 2, a first high refractive index layer 3, a silver layer 4, a second high refractive index layer 5 and a third high refractive index layer 6 are sequentially stacked.

[0039] Specifically, the substrate layer 1 is a PET layer having a thickness of 100 μm, 125 μm, or 188 μm. Based on the light transmittance of the film, the PET layer preferably has a total light transmittance of at least 90%. The hard coating layer 2 is an acrylic resin layer, specifically Arakawa Chemical CHT-X1.

[0040] Furthermore, both the first high refractive index layer 3 and the second high refractive index layer 5 are nickel-chromium alloy layers with a refractive index of 2.2nd. The first high refractive index layer 3 has a thickness of 10-20nm, and the second high refractive index layer 5 has a thickness of 2-6nm. The silver layer 4 has a thickness of 15-20nm and a refractive index of 0.135nd. The third high refractive index layer 6 is a niobium oxide layer with a thickness of 30-45nm and a refractive index of 2.3nd.

[0041] The utility model specifically combines the above layer structures and controls the thickness of each layer, so that the head-up display silver film can effectively reflect P-polarized light, making the projected image clearer and brighter, and effectively solving the ghosting problem.

[0042] Another specific embodiment of the present invention provides a windshield, wherein the glass body includes an inner glass, an outer glass, and the above-mentioned head-up display silver film disposed between the inner glass and the outer glass. An adhesive layer is provided on the side of the base material layer of the head-up display silver film facing away from the coating layer. The head-up display silver film is adhered to the inner surface of the outer glass via the adhesive layer, with the coating layer facing the inner glass.

[0043] Another specific embodiment of the present invention provides a head-up display system, including the above-mentioned windshield and a projection light source. The inner surface of the windshield is provided with a head-up display area, and the projection light source is used to emit P-polarized light to the head-up display area. The incident angle of the P-polarized light is 45° to 75°, and the incident angle is the angle between the incident light of the P-polarized light and the normal of the windshield.

[0044] Specifically, due to the refraction of the P polarized light emitted by the P light machine, the incident angle of the P polarized light will change when it enters the glass from the air and reaches the silver film of the head-up display. Figure 2 As shown, taking the incident angle α of P polarized light as 57° as an example, the incident angle of P polarized light when reaching the head-up display silver film is recorded as β, and the specific calculation method of the incident angle β of the light on the film surface is: it is known that the refractive index of air is n1=1, and the refractive index of glass is n2=1.52. The refractive index formula yields n1sinα=n2sinβ, and the data is inserted into it to obtain 1*sin57°=1.52*sinβ, Sinβ=sin57° / 1.52, β=arcsin(0.54), β=32.68°, and the reflection angle of β is about 33 degrees; and so on, according to the above formula, the β value corresponding to different incident angles α can be obtained.

[0045] The present invention is described in detail below with reference to specific embodiments, wherein Figure 3-11 The curve in is the reflectivity curve of β calculated from the incident angle α.

[0046] Example 1

[0047] A head-up display silver film comprises a PET layer with a thickness of 125 μm, an acrylic resin layer with a thickness of 3 μm, a nickel-chromium alloy layer with a thickness of 18 nm, a silver layer with a thickness of 15 nm, a nickel-chromium alloy layer with a thickness of 3 nm, and a niobium oxide layer with a thickness of 35 nm, which are stacked in sequence.

[0048] OCA optical adhesive was used to adhere the head-up display silver film to the inner surfaces of the inner and outer glass of the full-width windshield of the car. A projection light source, namely a P-light machine, was used to emit P-polarized light. The average reflectivity and reflection curve of the head-up display silver film after the P-light machine emitted light at different angles was tested.

[0049] like Figure 3 As shown, the angle of light emitted by the P-light machine is 45°, and the average reflectivity of the head-up display silver film at 380-780nm is 21.67%.

[0050] like Figure 4 As shown, the angle of light emitted by the P-light machine is 50°, and the average reflectivity of the head-up display silver film at 380-780nm is 22.09%.

[0051] like Figure 5 As shown, the angle of light emitted by the P-light machine is 55°, and the average reflectivity of the head-up display silver film at 380-780nm is 22.74%.

[0052] like Figure 6 As shown, the angle of light emitted by the P-light machine is 60°, and the average reflectivity of the head-up display silver film at 380-780nm is 23.26%.

[0053] like Figure 7 As shown, the angle of light emitted by the P-light machine is 65°, and the average reflectivity of the head-up display silver film at 380-780nm is 23.89%.

[0054] like Figure 8 As shown, the angle of light emitted by the P-light machine is 70°, and the average reflectivity of the head-up display silver film at 380-780nm is 24.2%.

[0055] like Figure 9 As shown, the angle of light emitted by the P-light machine is 75°, and the average reflectivity of the head-up display silver film at 380-780nm is 24.58%.

[0056] Example 2

[0057] A head-up display silver film comprises a PET layer with a thickness of 125 μm, an acrylic resin layer with a thickness of 3 μm, a nickel-chromium alloy layer with a thickness of 10 nm, a silver layer with a thickness of 10 nm, a nickel-chromium alloy layer with a thickness of 2 nm, and a niobium oxide layer with a thickness of 30 nm, which are stacked in sequence.

[0058] Use OCA optical adhesive to stick the head-up display silver film on the inner surface below the full width of the car's windshield, and test the reflectivity average and reflection curve after the P light machine emits light to the head-up display silver film. Figure 10 As shown, the angle of light emitted by the P-light machine is 60°, and the average reflectivity of the head-up display silver film at 380-780nm is 22.21%.

[0059] Example 3

[0060] A head-up display silver film comprises a PET layer with a thickness of 125 μm, an acrylic resin layer with a thickness of 3 μm, a nickel-chromium alloy layer with a thickness of 20 nm, a silver layer with a thickness of 20 nm, a nickel-chromium alloy layer with a thickness of 6 nm, and a niobium oxide layer with a thickness of 45 nm, which are stacked in sequence.

[0061] Use OCA optical adhesive to stick the head-up display silver film on the inner surface below the full width of the car's windshield, and test the reflectivity average and reflection curve after the P light machine emits light to the head-up display silver film. Figure 11 As shown, the angle of light emitted by the P-light machine is 60°, and the average reflectivity of the head-up display silver film at 380-780nm is 27.5%.

[0062] Combining Example 2 and Example 3, it can be seen that at the maximum and minimum values ​​of the thickness range and the angle of light emitted by the P light machine is 60°, the average reflectivity of the head-up display silver film is above 22%.

[0063] In combination with Examples 1-3, all coating thicknesses in the embodiments of the present invention can be used, but considering the issues of efficiency and coating uniformity, Example 1 is preferred, which has good stability and slight changes in the thickness of the upper and lower coating layers are within a controllable range.

[0064] In summary, the high reflectivity of the silver film used in this head-up display (HUD) results in clearer and brighter projected images, enhancing both visibility and comfort for the driver. Furthermore, the glass surface's near-zero reflectivity for P-polarized light minimizes ghosting, which can be further eliminated by coating the back of the film black.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0066] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A head-up display silver film, which acts on the middle of the laminated glass of a car windshield to reflect P-polarized light, characterized in that: The invention comprises a substrate layer, one side of which is provided with a coating layer prepared by a magnetron sputtering coating process, wherein the coating layer comprises a first high refractive index layer, a silver layer, a second high refractive index layer and a third high refractive index layer stacked in sequence; wherein the silver layer is provided between the first high refractive index layer and the second high refractive index layer, and the thickness of the silver layer is 15 to 20 nm.

2. The head-up display silver film according to claim 1, characterized in that: The first high refractive index layer is a nickel-chromium alloy layer with a thickness of 10 to 20 nm.

3. The head-up display silver film according to claim 1, characterized in that: The second high refractive index layer is a nickel-chromium alloy layer with a thickness of 2 to 6 nm.

4. The head-up display silver film according to claim 1, characterized in that: The third high refractive index layer is a niobium oxide layer with a thickness of 30 to 45 nm.

5. The head-up display silver film according to claim 1, characterized in that: A hard coating layer is further provided between the substrate layer and the first high refractive index layer, and the thickness of the hard coating layer is 3 to 5 μm.

6. The head-up display silver film according to claim 5, characterized in that: The hard coating layer is an acrylic resin layer.

7. The head-up display silver film according to claim 1, characterized in that: The substrate layer is a PET layer.

8. The front windshield is characterized by: The head-up display device comprises a glass body, the glass body comprising inner glass, outer glass, and the head-up display silver film according to any one of claims 1 to 7, disposed between the inner glass and the outer glass, wherein an adhesive layer is disposed on a side of a substrate layer of the head-up display silver film facing away from the coating layer, the head-up display silver film is adhered to the inner surface of the outer glass via the adhesive layer, and the coating layer faces the inner glass.

9. Head-up display system, characterized in that: It comprises the windshield and projection light source as described in claim 8, wherein the inner surface of the windshield is provided with a head-up display area, and the projection light source is used to emit P-polarized light to the head-up display area, and the incident angle of the P-polarized light is 45° to 75°.

10. The head-up display system according to claim 9, characterized in that: The incident angle is the angle between the incident light of the P-polarized light and the normal line of the windshield.

Images