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

Abstract

The utility model discloses a head-up display film, a front windshield and a head-up display system. The head-up display film comprises a light deflection layer; the base material layers are arranged on the two surfaces of the light deflection layer; the optical adhesive layer is arranged between the light deflection layer and the base material layer; and the light deflection layer is used for converting P polarized light or S polarized light incident from one side into S polarized light or P polarized light and emitting the S polarized light or P polarized light to the other side. When the head-up display film is applied to an interlayer of laminated glass, the reflectivity of the inner-layer glass is smaller than 0.05% and the reflectivity of the outer-layer glass is larger than 15.5% for P polarized light which is incident to the inner surface of the inner-layer glass at an angle of 30-40 degrees relative to the film, so that the problem of ghosting is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of head-up display (HUD), and particularly relates to a head-up display film, a front windshield and a head-up display system. Background Art

[0002] A head-up display (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, so that the driver can see important driving information such as speed and navigation without lowering or turning the head as much as possible.

[0003] At present, the mainstream HUDs in the market are generally windshield type (W-HUD) and augmented reality type (AR-HUD), and their functions cannot be realized without the front windshield. When light passes through the windshield, reflection and refraction will occur. Similarly, the refracted light beam will refract and reflect again on the rear surface of the glass. Since the two reflected lights do not completely overlap, a ghosting phenomenon will occur, that is, the human eye will see two staggered virtual images with the same content. The ghosting phenomenon not only destroys the image quality, but most importantly, it will affect driving safety. Currently, the ghosting phenomenon is eliminated by adding a wedge angle to the interlayer PVB in the windshield, but this method also has certain drawbacks. First, the wedge angle is related to the image source position and the light incident angle, so the wedge angle of each vehicle type's HUD is different and cannot be mass-produced uniformly. Second, in actual production, the installation of the windshield, HUD and other in-vehicle devices cannot be error-free. Therefore, the ghosting phenomenon will still occur. Finally, the requirements for the equipment and the installation accuracy of the equipment by HUD are very strict, resulting in high costs and being not conducive to commercialization.

[0004] In addition to the ghosting problem, too high temperature is also a common problem of current automotive HUDs. During actual driving of the vehicle, various weather conditions will be encountered, so the corresponding ambient brightness cannot remain unchanged. The large range of fluctuations in ambient brightness requires the projection emitter to emit extremely high brightness and a brightness control system. Therefore, reasonable heat dissipation of the bulb is a practical problem that needs to be considered. At the same time, although the HUD is used inside the vehicle, direct exposure to sunlight will inevitably cause the temperature to be too high, affecting its service life. Moreover, the temperature inside the vehicle will also be too high. Summary of the Utility Model

[0005] The purpose of this application is to provide a head-up display film, a front windshield and a head-up display system to solve the technical problems in the prior art that adding a wedge angle to the interlayer PVB in the windshield to eliminate the ghosting phenomenon cannot be mass-produced uniformly, the ghosting phenomenon still exists due to installation errors, and the installation accuracy requirements are too strict and not conducive to commercialization.

[0006] To achieve the above object, a first aspect of the present application provides a head-up display film, comprising:

[0007] A light deflection layer;

[0008] A substrate layer disposed on both sides of the light deflection layer;

[0009] An optical adhesive layer disposed between the light deflection layer and the substrate layer;

[0010] Wherein, the light deflection layer is configured to convert incident P-polarized light or S-polarized light on one side into S-polarized light or P-polarized light and emit it to the other side.

[0011] In one or more embodiments, the light deflection layer is a half-wave plate, and the thickness of the light deflection layer is 20 - 45 μm.

[0012] In one or more embodiments, the substrate layer is a TAC layer, a PMMA layer or a PC layer, and the total light transmittance of the substrate layer is greater than or equal to 90%.

[0013] In one or more embodiments, the thickness of the optical adhesive layer is 10 - 200 μm.

[0014] In one or more embodiments, it further includes an infrared barrier layer, and the infrared barrier layer is disposed on one side of the substrate layer facing away from or towards the light deflection layer.

[0015] In one or more embodiments, the thickness of the infrared barrier layer is 2 - 5 μm.

[0016] To achieve the above object, a second aspect of the present application provides a front windshield, comprising an inner glass and an outer glass arranged in a stacked manner, and the head-up display film according to any one of the above embodiments, and the head-up display film is disposed between the inner glass and the outer glass.

[0017] In one or more embodiments, for P-polarized light incident on the inner surface of the inner glass at an angle of 30 - 40° with respect to the surface of the inner glass, the reflectivity of the inner glass is less than 0.05%, and the reflectivity of the outer glass is greater than 15.5%.

[0018] To achieve the above object, a third aspect of the present application provides a front windshield, comprising an inner glass and an outer glass arranged in a stacked manner, and the head-up display film according to some embodiments, and the head-up display film is disposed between the inner glass and the outer glass. The front windshield has a barrier rate for infrared rays with λ = 940 nm greater than 88%, a barrier rate for infrared rays with λ = 1400 nm greater than 84.2%, and a barrier rate for infrared rays in the entire wavelength band greater than 82.5%.

[0019] To achieve the above object, a fourth aspect of the present application provides a head-up display system, including:

[0020] The front windshield glass described in any of the above embodiments, wherein the inner surface of the inner layer glass is provided with a HUD area;

[0021] A projection light source, the light emitting end thereof being aligned with the HUD area, and the projection light source is configured to emit P-polarized light to the HUD area at an incident angle of 30 to 40° with respect to the inner surface of the inner layer glass.

[0022] Different from the prior art, the beneficial effects of the present application are:

[0023] When the head-up display film of the present application is applied to the interlayer of the laminated glass, for the P-polarized light incident on the inner surface of the inner layer glass at an angle of 30 to 40° with respect to the film, the reflectivity of the inner layer glass is less than 0.05%, and at the same time, the reflectivity of the outer layer glass can be made greater than 15.5%, thereby effectively solving the ghosting problem;

[0024] When the head-up display film of the present application is applied to the interlayer of the laminated glass, it can effectively isolate infrared rays. The blocking rate for infrared rays with λ = 940 nm is greater than 88%, the blocking rate for infrared rays with λ = 1400 nm is greater than 84.2%, and the blocking rate for infrared rays in the full wavelength band is greater than 82.5%;

[0025] The head-up display film of the present application adopts a symmetric structure and has excellent thermal stability. The film does not warp after overheating at 80°. Description of the Drawings

[0026] 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 use in 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, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of an embodiment of the head-up display film of the present application;

[0028] Figure 2 It is a schematic structural diagram of the application state of an embodiment of the head-up display film of the present application;

[0029] Figure 3 It is a reflectivity curve diagram of light incident from air to glass at an incident angle of 30 to 40°;

[0030] Figure 4 It is a reflectivity curve diagram of light incident from glass to air at an incident angle of 30 to 40°;

[0031] Figure 5 It is a schematic structural diagram of another embodiment of the head-up display film of the present application;

[0032] Figure 6 It is a schematic structural diagram of yet another embodiment of the head-up display film of the present application;

[0033] Figure 7 It is a schematic structural diagram of one embodiment of the front windshield of the present application;

[0034] Figure 8 It is a schematic structural diagram of one embodiment of the head-up display system of the present application.

[0035] As shown in the figure:

[0036] Front windshield 1;

[0037] Head-up display film 10; light polarization layer 101; optical adhesive layer 102; substrate layer 103; infrared barrier layer 104;

[0038] Inner layer glass 20;

[0039] Outer layer glass 30;

[0040] Projection light source 40. Detailed implementation manners

[0041] In order to enable those skilled in the art to better understand the technical solutions in the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of 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.

[0042] Since the windshield itself has a certain thickness, it has two surfaces, an inner surface and an outer surface. When a beam of light in the light 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 respectively at the first surface of the windshield; and after the refracted light reaches the second surface of the glass, it will continue to be reflected and refracted. Therefore, the same incident beam of light usually undergoes two reflections on the first and second surfaces of the windshield, and these two reflected lights do not completely coincide, and they will reach the human eye in a staggered form; the lights reflected by the inner and outer layers of glass enter the eye simultaneously, forming two images with the same content and staggered positions, that is, double images are generated.

[0043] Especially in double-layer laminated glass, the ghosting problem is more serious. In the prior art, a wedge angle is added to the interlayer PVB in the windshield to eliminate the ghosting phenomenon, but this method also has certain disadvantages. First, the wedge angle is related to the image source position and the incident angle of the light, so the wedge angle of the HUD of each model is different and cannot be mass-produced uniformly. Secondly, in actual production, it is impossible to install the windshield, HUD and other equipment in the car without errors, so ghosting will still occur. Finally, HUD has very strict requirements on the equipment and the installation accuracy of the equipment, which makes the cost very high and is not conducive to commercialization.

[0044] In order to solve the above problems, the applicant has developed a head-up display film that can be applied to the front laminated glass. The film can make the P-polarized light incident on the glass have only one beam of reflected light, fundamentally solving the ghosting problem.

[0045] Specifically, see Figure 1 , Figure 1 It is a structural schematic diagram of an embodiment of the head-up display film of the present application.

[0046] like Figure 1 As shown, the head-up display film 10 includes a light deflection layer located in the center and substrate layers 103 disposed on both sides of the light deflection layer. The substrate layer 103 is bonded and fixed to the light deflection layer through an optical adhesive layer 102 .

[0047] The light deflection layer is used to convert P-polarized light or S-polarized light incident on one side into S-polarized light or P-polarized light incident on the other side.

[0048] In one embodiment, the substrate layer 103 can be made of TAC, PMMA or PC (polycarbonate) substrates of different thicknesses. According to the light transmittance of the film, a substrate with a total light transmittance of more than 90% is preferred. In some embodiments, in order to improve the adhesion of the substrate layer 103, the surface of the substrate can be subjected to corona treatment, plasma treatment, magnetron sputtering treatment, or a silane coupling agent, surfactant, etc. can be coated on the surface of the substrate, which will not be described in detail here.

[0049] In one implementation, the thickness of the optical adhesive layer 102 may be 10-200 μm. To ensure transmittance, the optical adhesive layer 102 may be made of transparent adhesive.

[0050] In one embodiment, the light deflection layer may adopt a half-wave plate, which can adjust the polarization direction of linearly polarized light. Specifically, assuming that the angle between the vibration plane of the linearly polarized light incident on the light deflection layer and the principal section of the crystal is α, the vibration plane of the projected linearly polarized light turns by an angle of 2α from the original orientation. When P-polarized light enters the half-wave plate, its vibration plane is perpendicular to the surface of the half-wave plate and parallel to the cross-section of the wave plate. The optical axis direction of the half-wave plate makes a 45° angle with its cross-section, and the plane perpendicular to the wave plate along the optical axis direction of the wave plate is the principal section. Therefore, the angle α between the vibration plane of the P-polarized light entering the half-wave plate and the principal section is 45°. As a result, for the linearly polarized light transmitted through the half-wave plate, the angle of its vibration plane turns by 90°, that is, the outgoing light is S-polarized light; conversely, when the incident light is S-polarized light, the outgoing light is P-polarized light.

[0051] In other embodiments, the light deflection layer may also be composed of two quarter-wave plates combined. Alternatively, the light polarization layer 101 may also be other coatings that can achieve the adjustment of the polarization direction of linearly polarized light, and all can achieve the effects of this embodiment.

[0052] In this application, the thickness of the light polarization layer 101 is not limited, as long as it can achieve the adjustment of the polarization direction of linearly polarized light, and a light polarization layer 101 with a high transmittance is preferably selected. All can achieve the effects of this embodiment. In one embodiment, the thickness of the light polarization layer 101 may be 20 - 45 μm.

[0053] Based on the head-up display film 10 of the above embodiments, when it is applied to the interlayer of laminated glass, for the P-polarized light incident on the inner surface of the glass at a specific angle, it can make only the outer surface of the outer layer glass 30 reflect the incident light in the laminated glass, and there is basically no reflection on other layers. Thus, there is only reflected light from one surface of the entire laminated glass for the incident light, effectively solving the ghosting problem.

[0054] The following is a detailed analysis. Please refer to Figure 2 , Figure 2 which is a schematic diagram of the application state structure of an embodiment of the head-up display film of this application.

[0055] As Figure 2 shown, in the application scenario, the projector can be controlled to project P-polarized light onto the inner layer glass 20. The incident light makes an angle θ1 with the inner layer glass 20. Correspondingly, the incident angle and the reflection angle are both i 10 = 90 - θ1.

[0056] When light waves are incident on the interface between two media, if the reflection coefficient is zero, then it is called the non-reflection phenomenon (i.e., total transmission). At this time, the incident angle i of the light wave when the non-reflection phenomenon occurs 10It is called the Brewster angle. According to the characteristics of Brewster's law, when the reflected light and the refracted light form a 90° angle, the P-polarized light in the reflected light disappears. Assuming the refraction angle is i2, it is easy to obtain that i 10 + i2 = 90°. Then, through the refraction formula n1sin i 10 = n2sin i2, the calculation formula for the Brewster angle i 10 = arctan(n2 / n1) can be obtained, where n1 and n2 are the refractive indices of the incident medium and the emerging medium respectively. Thus, substituting the refractive index n1 of air and the refractive index n2 of the inner layer of glass 20 into the above formula, the range of the Brewster angle i 10 can be calculated to be 50 - 60°. That is, as long as the angle θ1 between the incident light and the inner glass is about 30 - 40°, the P-polarized light projected by the projector will almost all pass through the inner glass and reach the interface between the film and the inner glass. Refer to Figure 3 Figure 3 which is the reflectivity curve graph of light incident from air to glass at an incident angle of 30 - 40°. As Figure 3 shown, the reflectivity of the P-polarized light is basically 0, that is, the P-polarized light basically all passes through.

[0057] The P-polarized light passing through the inner layer of glass 20 reaches the optical polarization layer 101 after refraction through the substrate layer 103, and S-polarized light is emitted after passing through the optical polarization layer 101. The S-polarized light reaches the outer layer of glass 30 after refraction through the substrate layer 103, and reaches the outer surface of the outer layer of glass 30 after refraction through the inner surface of the outer layer of glass 30. According to the law of refraction, it is easy to obtain that the incident angle of the S-polarized light with respect to the outer surface of the outer layer of glass 30 is 30 - 40° at this time. At an incident angle of 30 - 40°, the reflectivity of the P-polarized light incident from glass to air is extremely low, while the reflectivity of the S-polarized light reaches 10 - 20%. Refer to Figure 4 Figure 4 which is the reflectivity curve graph of light incident from glass to air at an incident angle of 30 - 40°.

[0058] As Figure 4 shown, when the incident angle is 30 - 40°, 10 - 20% of the S-polarized light is reflected by the outer surface of the outer layer of glass 30, while the P-polarized light basically all passes through. Since at this time, the light incident on the outer surface of the outer layer of glass 30 is basically all S-polarized light, the reflection of the outer surface of the outer layer of glass 30 on the optical fiber is greatly improved.

[0059] The reflected S-polarized light only reaches the optical polarization layer 101 after refraction, and becomes P-polarized light again, and then reaches the human eye after refraction, completing the entire projection process.

[0060] ​​During the entire process of light traveling as described above, only one beam of P-polarized light reaches the human eye. Therefore, the reflected images generated on the glass surface are effectively eliminated, thus effectively solving the problem of double images.

[0061] Based on the head-up display film 10 of the above embodiments, the problem of double images in the imaging of the laminated front windshield 1 HUD can be effectively solved. In order to further solve the problems of reduced life of the HUD projector and high heat dissipation requirements caused by excessive temperature, please refer to Figure 5 , Figure 5 which is a schematic structural diagram of another embodiment of the head-up display film of the present application.

[0062] As Figure 5 shown, in another embodiment, the head-up display film 10 further includes an infrared barrier layer 104 disposed on the side of the substrate layer 103 facing away from the light polarization layer 101.

[0063] The infrared barrier layer 104 is used to block the infrared rays outside the vehicle, thereby achieving the purpose of reducing the temperature inside the vehicle and the temperature of the HUD projector. In this embodiment, the infrared barrier layer 104 can be prepared by a coating method using any infrared barrier liquid having infrared barrier performance and a transmittance meeting the requirements. In particular, in order to improve the hardening performance of the film, the infrared barrier liquid and the hardening liquid can also be mixed and then coated to obtain the infrared barrier layer 104. Exemplarily, the ratio of the hardening liquid to the infrared barrier liquid can be 0.5 to 1. The above infrared barrier liquid and hardening liquid are both conventional materials in the art and will not be elaborated here.

[0064] In one embodiment, the thickness of the infrared barrier layer 104 can be 2 to 5 μm and can be adjusted based on the actual working conditions.

[0065] By disposing the infrared barrier layer 104 on the substrate layer 103, the heat outside the vehicle can be effectively isolated, achieving the effect of reducing the heat dissipation requirements of the projector and increasing the life of the projector.

[0066] In this embodiment, the infrared barrier layer 104 is disposed on the side of the substrate layer 103 facing away from the light polarization layer 101. In yet another embodiment, the infrared barrier layer 104 can also be disposed on the side of the substrate layer 103 facing the light polarization layer 101. Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of yet another embodiment of the head-up display film of the present application and can also achieve the effect of this embodiment, and will not be elaborated here.

[0067] The present application also provides a front windshield 1. Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of one embodiment of the front windshield of the present application.

[0068] As Figure 7As shown, the front windshield 1 includes an inner layer of glass 20 and an outer layer of glass 30, and a head-up display film 10 of any of the above embodiments is arranged between the inner layer of glass 20 and the outer layer of glass 30.

[0069] For P-polarized light with an incident angle of 30 to 40°, the front windshield 1 reflects the incident light only from the outer surface of the outer layer of glass 30, thereby effectively solving the ghosting problem.

[0070] The present application also provides a head-up display system. Please refer to Figure 8 , Figure 8 which is a schematic structural diagram of an embodiment of the head-up display system of the present application.

[0071] As Figure 8 shown, the head-up display system includes a projection light source 40 and the front windshield 1 of any of the above embodiments.

[0072] Among them, the inner surface of the front windshield 1 is provided with a HUD area; the light-emitting end of the projection light source 40 is aligned with the HUD area and emits P-polarized light to the HUD area at an incident angle of 30 to 40°.

[0073] The following further elaborates in detail the effects of the technical solution of the present application in combination with specific embodiments.

[0074] Example 1:

[0075] A head-up display film includes a half-wave plate, PC substrates symmetrically arranged on both sides of the half-wave plate, an optical adhesive layer arranged between the PC substrate and the half-wave plate, and an infrared barrier layer arranged on the side of the PC substrate facing away from the half-wave plate; wherein, the thickness of the PC substrate is 125 μm, and the thickness of the infrared barrier layer is 2.5 μm.

[0076] Example 2:

[0077] A head-up display film includes a half-wave plate, PC substrates symmetrically arranged on both sides of the half-wave plate, an optical adhesive layer arranged between the PC substrate and the half-wave plate, and an infrared barrier layer arranged on the side of the PC substrate facing away from the half-wave plate; wherein, the thickness of the PC substrate is 175 μm, and the thickness of the infrared barrier layer is 3.5 μm.

[0078] Example 3:

[0079] A head-up display film includes a half-wave plate, PC substrates symmetrically arranged on both sides of the half-wave plate, an optical adhesive layer arranged between the PC substrate and the half-wave plate, and an infrared barrier layer arranged on the side of the PC substrate facing away from the half-wave plate; wherein, the thickness of the PC substrate is 250 μm, and the thickness of the infrared barrier layer is 3.5 μm.

[0080] Example 4:

[0081] A head-up display film, comprising a half-wave plate, infrared barrier layers symmetrically arranged on both sides of the half-wave plate, an optical adhesive layer arranged between the infrared barrier layer and the half-wave plate, and a PC substrate arranged on the side of the infrared barrier layer facing away from the half-wave plate; wherein, the thickness of the PC substrate is 250 μm, and the thickness of the infrared barrier layer is 3.5 μm.

[0082] Example 5:

[0083] A head-up display film, comprising a half-wave plate, TAC substrates symmetrically arranged on both sides of the half-wave plate, an optical adhesive layer arranged between the TAC substrate and the half-wave plate, and an infrared barrier layer arranged on the side of the PC substrate facing away from the half-wave plate; wherein, the thickness of the TAC substrate is 80 μm, and the thickness of the infrared barrier layer is 3.5 μm.

[0084] Example 6:

[0085] A head-up display film, comprising a half-wave plate, infrared barrier layers symmetrically arranged on both sides of the half-wave plate, an optical adhesive layer arranged between the infrared barrier layer and the half-wave plate, and a TAC substrate arranged on the side of the infrared barrier layer facing away from the half-wave plate; wherein, the thickness of the TAC substrate is 60 μm, and the thickness of the infrared barrier layer is 3.5 μm.

[0086] Comparative Example 1:

[0087] A head-up display film, comprising a half-wave plate, PC substrates symmetrically arranged on both sides of the half-wave plate, an optical adhesive layer arranged between the PC substrate and the half-wave plate, and a hardening layer arranged on the side of the PC substrate facing away from the half-wave plate; wherein, the thickness of the PC substrate is 250 μm, and the thickness of the hardening layer is 3.5 μm.

[0088] Comparative Example 2:

[0089] A head-up display film, comprising a half-wave plate, an optical adhesive layer, a PC substrate, and an infrared barrier layer arranged in sequence; wherein, the thickness of the PC substrate is 250 μm, and the thickness of the infrared barrier layer is 3.5 μm.

[0090] Effect Example 1:

[0091] Apply the head-up display films of Examples 1 to 6 and Comparative Example 1 between the inner glass and the outer glass of laminated glass. Then, emit P-polarized light onto the inner glass with a projector. The P-polarized light forms an angle of 30 - 40° with the surface of the inner glass. Use a reflectivity detector to calculate the reflectivity of the incident light on the rear surfaces of the inner glass and the outer glass respectively, and obtain the following table data.

[0092]

[0093]

[0094] As can be seen from the data in the above table, when the head-up display films of Examples 1 to 6 and Comparative Example 1 are applied to laminated glass, for the P-polarized light incident at an angle of 30 to 40° with respect to the film, there is almost no reflection on the inner glass, and the reflectivity of the outer glass is more than 15%, thus effectively solving the problem of double images.

[0095] Effect Example 2:

[0096] The head-up display films of Examples 1 to 6 and Comparative Example 1 are applied between the inner glass and the outer glass of laminated glass, and an optical transmittance detector is used to measure the blocking rates of the laminated glass for infrared light with λ = 1400 nm and infrared light in the full wavelength band, and the following data are obtained.

[0097]

[0098] As can be seen from the above data, when the head-up display films of Examples 1 to 6 are applied to laminated glass, they can effectively block infrared rays and reduce the temperature.

[0099] Effect Example 3:

[0100] The head-up display film of Example 4 is applied between the inner glass and the outer glass of laminated glass, and then a projector is used to emit P-polarized light to the inner glass. The P-polarized light forms an angle of 40 to 50° with respect to the surface of the inner glass. A reflectivity detector is used to calculate the reflectivities of the inner glass and the outer glass for the incident light respectively, and the results are as follows: the reflectivity of the incident light on the inner glass is 1.05%, and the reflectivity on the rear surface of the outer glass is 9.62%.

[0101] Since there is a certain reflectivity on both the inner and outer glasses of the laminated glass, a double image phenomenon will occur.

[0102] Effect Example 4:

[0103] The films of Examples 1 to 6 and Comparative Example 2 are subjected to an over-temperature experiment at 80°. The results show that: the films of Examples 1 to 6 have no warping after the over-temperature at 80°, while the film of Comparative Example 3 has serious warping after the over-temperature at 80°. This is mainly because the film of Comparative Example 2 does not adopt a symmetric structure, and the thermal stability of the film is poor.

[0104] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention 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 invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0105] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner 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 head-up display film, characterized in that, Comprising: A light deflection layer; A substrate layer disposed on both sides of the light deflection layer; An optical adhesive layer disposed between the light deflection layer and the substrate layer; Wherein, the light deflection layer is configured to convert incident P-polarized light or S-polarized light on one side into S-polarized light or P-polarized light and emit it to the other side.

2. The head-up display film according to claim 1, characterized in that, The light deflection layer is a half-wave plate, and the thickness of the light deflection layer is 20 - 45 μm.

3. The head-up display film according to claim 1, wherein The substrate layer is a TAC layer, a PMMA layer or a PC layer, and the total light transmittance of the substrate layer is greater than or equal to 90%.

4. The head-up display film according to claim 1, characterized in that, The thickness of the optical adhesive layer is 10 - 200 μm.

5. The head-up display film according to claim 1, characterized in that, It further includes an infrared barrier layer, and the infrared barrier layer is disposed on one side of the substrate layer facing away from or towards the light deflection layer.

6. The head-up display film according to claim 5, wherein, The thickness of the infrared barrier layer is 2 - 5 μm.

7. A windshield, characterized in that, Comprising a laminated inner glass and outer glass, and the head-up display film according to any one of claims 1 to 6, wherein the head-up display film is disposed between the inner glass and the outer glass.

8. The front windshield according to claim 7, characterized in that, For P-polarized light incident on the inner surface of the inner glass at an angle of 30 - 40° with respect to the surface of the inner glass, the reflectivity of the inner glass is less than 0.05%, and the reflectivity of the outer glass is greater than 15.5%.

9. A front windshield, characterized in that, Comprising a laminated inner glass and outer glass, and the head-up display film according to claim 5 or 6, wherein the head-up display film is disposed between the inner glass and the outer glass, and the front windshield glass has a blocking rate of more than 88% for infrared light with λ = 940 nm, a blocking rate of more than 84.2% for infrared light with λ = 1400 nm, and a blocking rate of more than 82.5% for infrared rays in the entire wavelength band.

10. A head-up display system, characterized in that, Comprising: The front windshield glass according to any one of claims 7 to 9, wherein an HUD area is provided on the inner surface of the inner glass; A projection light source, the light emitting end of which is aligned with the HUD area, and the projection light source is configured to emit P-polarized light to the HUD area at an incident angle of 30 - 40° with respect to the inner surface of the inner glass.

Images