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

Abstract

The utility model discloses a head-up display aluminum film, a front windshield and a head-up display system, the head-up display aluminum 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, an aluminum layer, a low-refractive-index layer and a second high-refractive-index layer which are stacked in sequence; the aluminum layer is arranged between the first high refractive index layer and the low refractive index layer, and the thickness of the aluminum layer is 10-20 nm. Under the large angle of 45-75 degrees, the light guide plate has high reflectivity to P polarized light, the reflection mean value is stable, and ghosting can be effectively eliminated.

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 aluminum film, a windshield, and a head-up display system. Background Art

[0002] A HUD, or heads-up display, projects important driving information such as speed and navigation onto the windshield in front of the driver, allowing the driver to access a wealth of information without taking their eyes off the road. The HUD uses the windshield as a fusion of virtual images and real scenes. Light from the HUD is reflected through the windshield to the human eye, allowing the driver to see the projected virtual image. However, the windshield has a certain thickness and two surfaces. The same beam of incident light typically reflects twice on the first and second surfaces of the windshield. These two reflected rays do not completely overlap, and the two rays reach the human eye in a staggered manner. The image reflected from the first surface of the windshield is the main image we need, while the image reflected from the second surface is what is commonly referred to as ghosting. The presence of ghosting not only reduces image quality but also causes dizziness to the viewer, affecting the driver's driving experience.

[0003] A common solution to the ghosting problem is to change the shape and thickness of the PVB film on the windshield. Wedge-shaped PVB film allows the driver to observe a clear image, effectively solving the ghosting problem. However, there are also some disadvantages. For example, the wedge-shaped PVB film needs to be designed according to each HUD-equipped vehicle model; it cannot completely eliminate ghosting, and a certain degree of ghosting can still be detected when evaluating the final image.

[0004] 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

[0005] The purpose of the utility model is to provide a head-up display aluminum film, a windshield and a head-up display system. The head-up display aluminum film is attached to the inner surface below the windshield of a car, can reflect P-polarized light, and can eliminate the ghosting phenomenon produced by the windshield at a wide viewing angle.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by a specific embodiment of the present invention is as follows:

[0007] A head-up display aluminum film is used in the middle of a car's front windshield laminated glass to reflect P-polarized light. The film comprises a substrate layer, one side of which is provided with a coating layer prepared by a magnetron sputtering coating process. The coating layer comprises a first high-refractive index layer and a low-refractive index layer stacked in sequence, and the aluminum layer has a thickness of 10 to 20 nm.

[0008] 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 2 to 10 nm.

[0009] In one or more embodiments of the present invention, the low refractive index layer is a silicon dioxide layer with a thickness of 80 to 120 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 4 to 7 nm.

[0011] 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 hard coating layer has a thickness of 3 to 5 μm.

[0012] In one or more embodiments of the present invention, the hard coating layer is an acrylic resin layer.

[0013] In one or more embodiments of the present invention, the substrate layer is a PET layer.

[0014] Another specific embodiment of the present invention provides a technical solution as follows:

[0015] A windshield comprising a glass body, the glass body comprising inner glass, outer glass, and the above-mentioned head-up display aluminum film disposed between the inner glass and the outer glass, wherein an adhesive layer is provided on a side of a base material layer of the head-up display aluminum film facing away from the coating layer, the head-up display aluminum film being adhered to the inner surface of the outer glass via the adhesive layer, with the coating layer facing the inner glass.

[0016] Another specific embodiment of the present invention provides a technical solution as follows:

[0017] 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°.

[0018] 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.

[0019] Compared to existing technologies, the head-up display aluminum film of this invention reflects P-polarized light and has a high P-polarized light reflectivity. It eliminates windshield ghosting at wide viewing angles, providing better image quality and viewing experience, and enhances display contrast. Furthermore, since most drivers currently wear polarized sunglasses, which are typically P-polarized, the P-polarized light-reflecting properties of this head-up display aluminum film make it more comfortable and provide clearer images for drivers wearing polarized sunglasses. Furthermore, the aluminum used is inexpensive, and the roll-to-roll filming process is highly efficient, making it suitable for a wide range of vehicle types. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 This is a schematic structural diagram of a head-up display aluminum film in one embodiment of the present utility model;

[0022] Figure 2 Schematic diagram of the incident angle and reflection angle of P-polarized light in one embodiment of the present invention;

[0023] Figure 3 This is a reflection curve of a head-up display aluminum film when the P light machine in Example 1 emits light at 45 degrees;

[0024] Figure 4 This is a reflection curve of a head-up display aluminum film when the P light machine in Example 1 emits 50° light;

[0025] Figure 5 This is a reflection curve of a head-up display aluminum film when the P light machine in Example 1 emits light at 55°;

[0026] Figure 6 This is a reflection curve of a head-up display aluminum film when the P light engine in Example 1 emits 60° light;

[0027] Figure 7 This is a reflection curve of a head-up display aluminum film when the P light engine in Example 1 emits light at 65°;

[0028] Figure 8 This is a reflection curve of a head-up display aluminum film when the P light machine in Example 1 emits 70° light;

[0029] Figure 9 This is a reflection curve of a head-up display aluminum film when the P light machine in Example 1 emits light at 75°;

[0030] Figure 10 This is the reflection curve of a head-up display aluminum film when the P light machine emits 60° light in Example 2;

[0031] Figure 11 This is the reflection curve of a head-up display aluminum film when the P light machine in Example 3 emits 60° light.

[0032] Description of main reference numerals:

[0033] 1. Base material layer; 2. Hard coating layer; 3. First high refractive index layer; 4. Aluminum layer; 5. Low refractive index layer; 6. Second high refractive index layer. DETAILED DESCRIPTION

[0034] 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.

[0035] A specific embodiment of the present invention provides a head-up display aluminum film, such as Figure 1 As shown, it includes a substrate layer 1, a hard coating layer 2, a first high refractive index layer 3, an aluminum layer 4, a low refractive index layer 5 and a second high refractive index layer 6 which are stacked in sequence.

[0036] Specifically, substrate layer 1 is a PET layer with a thickness of 100 μm, 125 μm, or 188 μm. To ensure the film's light transmittance, the PET layer has a total light transmittance of at least 90%. Hard coating layer 2 is an acrylic resin layer with a thickness of 3 to 5 μm, specifically Arakawa Chemical CHT-X1.

[0037] Furthermore, both the first high-refractive-index layer 3 and the second high-refractive-index layer 6 are nickel-chromium alloy layers with a refractive index of 2.2nd. The thickness of the first high-refractive-index layer 3 is 2 to 10 nm, and the thickness of the second high-refractive-index layer 6 is 4 to 7 nm. The aluminum layer 4 is 10 to 20 nm thick and has a refractive index of 1.35nd. The low-refractive-index layer 5 is a silicon dioxide layer with a thickness of 80 to 120 nm and a refractive index of 1.46nd. The present invention utilizes this layered design to effectively reflect P-polarized light, resulting in clearer projected images.

[0038] Another specific embodiment of the present invention provides a windshield, which includes a glass body, which includes an inner glass, an outer glass, and the above-mentioned head-up display aluminum film arranged between the inner glass and the outer glass. The head-up display aluminum film has a base layer provided with an adhesive layer on the side facing away from the coating layer. The head-up display aluminum film is adhered to the inner surface of the outer glass through the adhesive layer, and the coating layer faces the inner glass.

[0039] 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. The projection light source is specifically a P light machine, which 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.

[0040] 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 aluminum 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 aluminum 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.

[0041] 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.

[0042] Example 1

[0043] A head-up display aluminum 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 5 nm, an aluminum layer with a thickness of 11 nm, a silicon dioxide layer with a thickness of 90 nm, and a nickel-chromium alloy layer with a thickness of 5 nm, which are stacked in sequence.

[0044] The head-up display aluminum film was adhered to the inner surfaces of the inner and outer glass of the entire width of the car's windshield using OCA optical adhesive. The average reflectivity and reflection curve of the head-up display aluminum film were tested after light from a P-light machine at different angles was emitted.

[0045] like Figure 3As shown, the angle of light emitted by the P-light machine is 45°, and the average reflectivity of the head-up display aluminum film at 380-780nm is 19.9%.

[0046] 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 aluminum film at 380-780nm is 19.76%.

[0047] 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 aluminum film at 380-780nm is 19.58%.

[0048] 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 aluminum film at 380-780nm is 19.48%.

[0049] 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 aluminum film at 380-780nm is 19.55%.

[0050] 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 aluminum film at 380-780nm is 19.56%.

[0051] 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 aluminum film at 380-780nm is 19.59%.

[0052] Example 2

[0053] A head-up display aluminum 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, an aluminum layer with a thickness of 20 nm, a silicon dioxide layer with a thickness of 120 nm, and a nickel-chromium alloy layer with a thickness of 7 nm, which are stacked in sequence.

[0054] The head-up display aluminum film was bonded to the inner surface of the inner and outer glass of the full-width front windshield of the car using OCA optical adhesive, and the reflectivity average and reflection curve of the head-up display aluminum film after the light emitted by the P light machine was tested. 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 aluminum film at 380-780nm is 20.01%.

[0055] Example 3

[0056] A head-up display aluminum 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 2 nm, an aluminum layer with a thickness of 10 nm, a silicon dioxide layer with a thickness of 80 nm, and a nickel-chromium alloy layer with a thickness of 4 nm, which are stacked in sequence.

[0057] Use OCA optical adhesive to stick the head-up display aluminum film to 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 aluminum 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 aluminum film at 380-780nm is 21.99%.

[0058] Combining Examples 2 and 3, at the maximum and minimum thickness ranges, and with the P-light machine emitting light at a 60° angle, the average reflectivity of the head-up display aluminum film is approximately 20%. Combining Examples 1-3, all disclosed coating thicknesses can be used, but due to issues with efficiency and coating uniformity, Example 1 is preferred, as it offers excellent stability and even slight variations in the thickness of the upper and lower coating layers are within a controllable range.

[0059] In summary, the HUD aluminum film in this embodiment has a high reflectivity for P-polarized light, resulting in clearer and brighter projected images, improving visibility and comfort for the driver when viewing HUD content. Furthermore, when the HUD aluminum film is applied behind the windshield, the reflectivity of the outer surface of the windshield for P-polarized light is virtually zero, minimizing ghosting. Furthermore, if desired, the back of the HUD aluminum film can be painted black to further eliminate ghosting.

[0060] 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.

[0061] 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 aluminum film, which acts on the middle of the laminated glass of a car windshield to reflect P-polarized light, characterized in that: It includes a substrate layer, one side of which is provided with a coating layer prepared by a magnetron sputtering coating process, the coating layer includes a first high refractive index layer, an aluminum layer, a low refractive index layer and a second high refractive index layer stacked in sequence, the aluminum layer is arranged between the first high refractive index layer and the low refractive index layer, and the thickness of the aluminum layer is 10 to 20 nm.

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

3. The head-up display aluminum film according to claim 1, characterized in that: The low refractive index layer is a silicon dioxide layer with a thickness of 80 to 120 nm.

4. The head-up display aluminum film according to claim 1, characterized in that: The second high refractive index layer is a nickel-chromium alloy layer with a thickness of 4-7 nm.

5. The head-up display aluminum 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 hard coating layer has a thickness of 3 to 5 μm.

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

7. The head-up display aluminum 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, wherein the glass body comprises inner glass, outer glass, and a head-up display aluminum film according to any one of claims 1 to 7, which is arranged between the inner glass and the outer glass. A base material layer of the head-up display aluminum film is provided with an adhesive layer on a side facing away from the coating layer. The head-up display aluminum 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.

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