Head-up display glass and head-up display system

Abstract

A head-up display glass and a head-up display system are provided. The head-up display glass includes an outer layer glass, an inner layer glass, an intermediate layer, and a reflective coating. The intermediate layer is installed between the second surface of the outer layer glass and the third surface of the inner layer glass. The reflective coating is installed on the fourth surface of the inner layer glass, and the reflective coating can reflect P-polarized light. The reflective coating includes at least one low-emissivity layer and at least one laminated structure installed in layers. Each laminated structure includes a high refractive index layer and a low refractive index layer laminated in sequence. In each laminated structure, the high refractive index layer is closer to the fourth surface than the low refractive index layer. The refractive index of the high refractive index layer is 1.8 or more, and the refractive index of the low refractive index layer is less than 1.8. This application can achieve both the head-up display (HUD), heat insulation, and low-emissivity multiple performances, enabling the driver or passenger to more clearly observe a clear and ghost-free head-up display image.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and particularly to head-up display glass and a head-up display system.

Background Art

[0002] A vehicle equipped with a head-up display (HUD) system can display important driving information such as speed, engine speed, fuel consumption, tire pressure, navigation, etc., and information of external smart devices in real time in the driver's field of vision. Thereby, the driver can observe the information of devices such as the dashboard without lowering the head, so as to prevent the driver from being distracted from the attention to the road ahead, and at the same time, there is no need for the driver to adjust the eyes to observe the distant road and the nearby instruments, so that eye fatigue can be avoided, driving safety can be greatly improved, and the driving experience can be enhanced. Currently, it is difficult for the laminated glass applied to the head-up display system to achieve both the multiple performances of head-up display (HUD), heat insulation, and low emissivity.

Summary of the Invention

[0003] Embodiments of this application provide a head-up display glass and a head-up display system that can achieve both the multiple performances of head-up display (HUD), heat insulation, and low emissivity, so that drivers and passengers can observe the head-up display image more clearly, and improve the visual comfort, thermal comfort, and driving safety of users.

[0004] In a first aspect, the present application provides a head-up display glass. The head-up display glass includes an outer layer glass, an inner layer glass, an intermediate layer, and a reflective coating. The outer layer glass includes a first surface and a second surface that are oppositely disposed. The inner layer glass includes a third surface and a fourth surface that are oppositely disposed. The third surface and the second surface are oppositely disposed. The intermediate layer is disposed between the second surface and the third surface. The reflective coating is disposed on the fourth surface. The reflective coating can reflect P-polarized light. The reflective coating includes at least one low-emissivity layer and at least one laminated structure that are laminated. Each laminated structure includes a high refractive index layer and a low refractive index layer that are sequentially laminated. In each laminated structure, the high refractive index layer is closer to the fourth surface than the low refractive index layer. The refractive index of the high refractive index layer is 1.8 or more, and the refractive index of the low refractive index layer is less than 1.8.

[0005] In one possible embodiment, the material of the low-emissivity layer is ITO, FTO, or doped zinc oxide. The doping element in the doped zinc oxide includes at least one of yttrium (Y), calcium (Ca), tin (Sn), indium (In), copper (Cu), magnesium (Mg), tungsten (W), hafnium (Hf), zirconium (Zr), aluminum (Al), silver (Ag), platinum (Pt), and gold (Au).

[0006] In one possible embodiment, when the thickness of the low-emissivity layer is 30 nm or more and 100 nm or less, the emissivity of the head-up display glass measured on the inner layer glass side is 0.85 or less.

[0007] In one possible embodiment, when the thickness of the low-emissivity layer is greater than 100 nm and 200 nm or less, the emissivity of the head-up display glass measured on the inner layer glass side is 0.5 or less.

[0008] In one possible embodiment, when the thickness of the low-emissivity layer is greater than 200 nm, the emissivity of the head-up display glass measured on the inner layer glass side is 0.2 or less.

[0009] In one possible embodiment, at least one low-emission layer is in direct contact with the fourth surface and / or the low refractive index layer.

[0010] In one possible embodiment, the total thickness of the low refractive index layer is greater than the total thickness of the high refractive index layer.

[0011] In one possible embodiment, the outer layer glass is tinted glass, the direct solar energy transmittance of the outer layer glass is less than 70%, the visible light transmittance of the outer layer glass is greater than 80%, and the absorption rate of the outer layer glass for P-polarized light is 3% or more.

[0012] In one possible embodiment, the intermediate layer is a rectangular intermediate layer or a wedge-shaped intermediate layer with a wedge angle of 0.01 mrad to 0.18 mrad.

[0013] In one possible embodiment, the total solar energy transmittance of the head-up display glass is 65% or less.

[0014] In one possible embodiment, the reflectance of the head-up display glass for P-polarized light incident at an incident angle of 65° is 18% or more.

[0015] In one possible embodiment, the reflectance of the head-up display glass for P-polarized light with wavelengths of 469 nm, 532 nm, and 629 nm incident at an incident angle of 65° is all 13% or more.

[0016] In one possible embodiment, the ratio of the reflectance of the main image to the reflectance of the sub-image of the head-up display glass for P-polarized light incident at an incident angle of 65° is 25 or more.

[0017] In one possible embodiment, the visible light transmittance of the head-up display glass is 70% or more, and among the Lab values of the reflected color of the head-up display glass for visible light incident at an incident angle of 65° measured on the outer glass side, the a value is 1 or less, and the reflectance of the head-up display glass for visible light incident at an incident angle of 65° measured on the inner glass side is less than 30%.

[0018] In one possible embodiment, the reflective coating includes two low-emissivity layers. One low-emissivity layer is located between the fourth surface and at least one laminated structure, and the other low-emissivity layer is located outside the low refractive index layer farthest from the fourth surface in the at least one laminated structure.

[0019] In one possible embodiment, at least one low-emissivity layer is located within at least one laminated structure, and the low-emissivity layer located within the laminated structure forms a "low-emissivity layer / low refractive index layer" structure instead of the high refractive index layer of the laminated structure.

[0020] In one possible embodiment, the total thickness of the low refractive index layers in the reflective coating is greater than the total thickness of the high refractive index layers.

[0021] In one possible embodiment, the visible light transmittance of the outer glass is 80% or more, the direct solar energy transmittance of the outer glass is 60% or less, the visible light transmittance of the intermediate layer is 80% or more, and the direct solar energy transmittance of the intermediate layer is less than 70%.

[0022] In one possible embodiment, the high refractive index layer includes at least two high refractive index sub-layers, the refractive index difference between two adjacent high refractive index sub-layers is 0.1 or more, and / or the low refractive index layer includes at least two low refractive index sub-layers.

[0023] In a second aspect, the present application provides a head-up display system. The head-up display system includes a projection device and the above-mentioned head-up display glass. The projection device is used to generate a projection light beam including at least 80% P-polarized light, and the projection light beam is incident on the reflective coating at an incident angle of 45° to 85°.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0025] Hereinafter, specific embodiments of the present application will be clearly described with reference to the drawings.

[0026] Embodiments of the present application provide a head-up display glass, a head-up display system, and a vehicle, which can achieve both head-up display (HUD), heat insulation, and low-emission multiple performances, enabling drivers and passengers to more clearly observe a clear and ghost-free head-up display image, thereby improving the visual comfort, thermal comfort, and driving safety of users.

[0027] FIG. 1 is a schematic diagram showing the structure of a vehicle 300 provided by an embodiment of the present application.

[0028] Referring to FIG. 1, the vehicle 300 may include a vehicle body 310 and a head-up display system 200 connected to the vehicle body 310. The head-up display system 200 may include a projection device 210 and a head-up display glass 100.

[0029] The head-up display glass 100 may be the front glass of the vehicle 300, and the projection device 210 may be mounted inside the vehicle body 310. The projection device 210 can emit projection light rays to the head-up display glass 100. The projection light rays are incident on the head-up display glass 100 at an incident angle of 45° to 85°. After being reflected by the head-up display glass 100, the projection light rays enter the human eye, allowing the human eye to observe a clear and ghost-free head-up display image located in front of the head-up display glass 100.

[0030] The projection light beam emitted by the projection device 210 contains at least 80% P-polarized light. The head-up display glass 100 of the present application can reflect the P-polarized light to form a head-up display image. The higher the proportion of P-polarized light in the projection light beam, the easier it is to eliminate the visual ghosting phenomenon of the head-up display image. More preferably, the projection light beam contains at least 90% P-polarized light, particularly 100% P-polarized light, that is, the projection light beam is substantially pure P-polarized light. The head-up display glass 100 of the present application has a reflectivity of 18% or more, more preferably 20% or more, for P-polarized light incident at an incident angle of 65°, which enhances the brightness and vividness of the head-up display image and improves driving safety.

[0031] Here, in order to realize a full-color display of the head-up display image, the reflectivities of the head-up display glass 100 of the present application for P-polarized light with wavelengths of 469 nm, 532 nm, and 629 nm incident at an incident angle of 65° are all 13% or more, preferably all 15% or more, more preferably all 18% or more, and even more preferably all 20% or more.

[0032] Here, the total solar energy transmittance Tts of the head-up display glass 100 of the present application is 65% or less, preferably 60% or less, more preferably 55% or less, even more preferably 50% or less, and even more preferably 45% or less. Therefore, it has excellent heat insulation performance and enhances the thermal comfort inside the vehicle.

[0033] Here, the emissivity of ordinary laminated glass is generally about 0.9. The emissivity of the head-up display glass 100 of the present application measured inside the vehicle is 0.85 or less, more preferably 0.5 or less, even more preferably 0.3 or less, and even more preferably 0.2 or less. Therefore, it has good low-emissivity performance, can reduce the entry of heat radiation from outside the vehicle into the interior of the vehicle 300 in summer, and can reduce the dissipation of the heat inside the vehicle to the outside of the vehicle 300 in winter. Therefore, it is advantageous for meeting the requirements of energy conservation and environmental protection.

[0034] Here, among the Lab values of the reflection color of the head-up display glass 100 of the present application for visible light incident at an incident angle of 65° measured outside the vehicle, the a value is 1 or less, which prevents the color from tending towards red when observing the head-up display glass 100 outside the vehicle and maintains the overall beauty.

[0035] Here, the visible light transmittance of the head-up display glass 100 of the present application is 70% or more, which can meet the safety driving requirements of vehicle glass. In order to reduce the reflection formed by objects inside the vehicle, such as the dashboard, on the head-up display glass 100 that obstructs the driver's view, the reflectance of the head-up display glass 100 of the present application for visible light incident at an incident angle of 65° measured inside the vehicle is less than 30%, preferably 25% or less.

[0036] FIG. 2 is a schematic diagram showing the structure of the head-up display glass of the head-up display system shown in FIG. 1.

[0037] Referring to FIG. 2, the head-up display glass 100 can include an outer layer glass 10, an intermediate layer 20, an inner layer glass 30, and a reflective coating 40. The outer layer glass 10, the intermediate layer 20, and the inner layer glass 30 are sequentially laminated to form laminated glass. The reflective coating 40 is installed on the surface of the inner layer glass 30 away from the intermediate layer 20, and the reflective coating 40 can reflect P-polarized light.

[0038] The purpose of FIG. 2 is only to illustrate the connection relationship of the outer glass 10, the intermediate layer 20, the inner glass 30, and the reflective coating 40, and does not specifically limit the connection positions, specific structures, and numbers of each component. The configuration shown in the embodiments of the present application does not constitute a specific limitation on the head-up display glass 100. In other embodiments of the present application, the head-up display glass 100 may include more components or fewer components than those shown, or combine some components, or divide some components, or have different component arrangements. The illustrated components can be realized by hardware, software, or a combination of software and hardware.

[0039] Continuing to refer to FIG. 2, the outer layer glass 10 can include a first surface 101 and a second surface 102 that are oppositely disposed. The first surface 101 is a surface closer to the outside of the vehicle in the outer layer glass 10, and the second surface 102 is a surface closer to the intermediate layer 20 in the outer layer glass 10. Exemplarily, the thickness range of the outer layer glass 10 may be 1.8 mm or more. Specifically, for example, it may be 1.9 mm, 2.0 mm, 2.1 mm, 2.5 mm, 2.8 mm, 3.0 mm, 3.2 mm, 3.5 mm, etc. The outer layer glass 10 may be transparent glass or colored glass. The colored glass may be green glass, gray glass, etc. The colored glass has a certain absorption effect on P polarization. Therefore, the P polarization reaching the first surface 101 of the outer layer glass 10 can be reduced, the luminance of the sub-image formed by the reflection of the light rays projected onto the first surface 101 can be further weakened, the ghost problem of the head-up display glass 100 can be solved, and the head-up display image formed by the reflection of the light rays projected onto the reflective coating 40 can be sharpened. At the same time, when colored glass is adopted as the outer layer glass 10, the influence of the reflective coating 40 on the reflection color outside the vehicle can be reduced, which is beneficial to improving the design freedom of the reflective coating 40. In addition, the colored glass also has a certain absorption effect on infrared rays, ultraviolet rays, etc., and further brings heat insulation and sunscreen effects. The material of the outer layer glass 10 can include sodium calcium silicate, borosilicate, aluminosilicate, etc.

[0040] In one possible embodiment, the direct solar energy transmittance TE of the outer layer glass 10 can be less than 70%, the visible light transmittance of the outer layer glass 10 can be greater than 80%, and the absorption rate of the outer layer glass 10 for P polarization can be 3% or more.

[0041] The intermediate layer 20 is provided between the outer layer glass 10 and the inner layer glass 30. The difference between the refractive index of the intermediate layer 20 and the refractive index of the outer layer glass 20 is less than 0.1, and the difference between the refractive index of the intermediate layer 20 and the refractive index of the inner layer glass 30 is less than 0.1. The intermediate layer 20 forms the head-up display glass 100 of the laminated glass structure by connecting the outer layer glass 10 and the inner layer glass 30, meeting the safety requirements during vehicle use.

[0042] In the present application, by providing the reflective coating 40, the head-up display glass 100 can reflect P-polarized light, forming a clear and ghost-free head-up display image. Thereby, the use of existing wedge-shaped intermediate layers with large wedge angles, such as wedge-shaped PVB that is expensive, difficult to produce and manufacture, and has a wedge angle greater than 0.3 mrad, can be avoided. In the present application, a rectangular intermediate layer with a uniform thickness can be selected. The wedge angle of the rectangular intermediate layer is close to zero, and the production and manufacturing cost of the head-up display glass 100 can be reduced. In the production and manufacturing process of the head-up display glass 100, a wedge-shaped intermediate layer with a small wedge angle can also be formed. For example, by a high-pressure lamination process or a simple stretching process, the rectangular intermediate layer can form a wedge-shaped intermediate layer with a wedge angle of 0.01 mrad to 0.18 mrad. Specifically, the wedge angle can be 0.05 mrad, 0.10 mrad, 0.15 mrad, 0.18 mrad, etc. Therefore, while reducing the cost, reflective ghosts and perspective ghosts can be removed to obtain a higher-quality head-up display image and observation effect.

[0043] Exemplarily, the material of the intermediate layer 20 is a thermoplastic polymer, specifically, it can be PVB (Polyvinyl butyral), EVA (ethylene vinyl acetate), SGP (sentry glass plue), or PU (polyurethane), etc. Of course, the intermediate layer 20 may have a single-layer structure or a multi-layer structure. Examples of the multi-layer structure include a two-layer structure, a three-layer structure, a four-layer structure, a five-layer structure, etc. The intermediate layer 20 can have other functions. For example, by providing at least one coloring region and using it as a shadow zone, the interference of sunlight to the human eye can be reduced. Or, by adding an infrared absorber, a solar radiation shielding function or a heat insulation function can be provided. Or, by adding an ultraviolet absorber, an ultraviolet blocking function can be provided. Or, by having one layer of the multi-layer structure have a higher plasticizer content, the intermediate layer 20 can have a sound insulation function.

[0044] The inner layer glass 30 can include a third surface 301 and a fourth surface 302 provided opposite to each other. The third surface 301 is the surface of the inner layer glass 30 close to the intermediate layer 20, and the fourth surface 302 is the surface of the inner layer glass 30 close to the inside of the vehicle. The third surface 301 and the fourth surface 302 are provided opposite to each other. The thickness range of the inner layer glass 30 may be 0.7 mm to 2.1 mm (including the endpoints 0.7 mm and 2.1 mm), specifically, it can be 0.7 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2.1 mm, etc. Preferably, the thickness of the inner layer glass 30 may be equal to or less than the thickness of the outer layer glass 10. For example, the outer layer glass 10 is at least 0.5 mm thicker than the inner layer glass 30. By using a thinner inner layer glass 30, the head-up display glass 100 can form an asymmetric thickness laminated glass structure, satisfying the safety requirements of the head-up display glass 100 while achieving weight reduction and obtaining a better head-up display effect.

[0045] In one possible embodiment, the projection light rays are incident on the head-up display glass 100 at an incident angle of 45° to 85°. Some of the projection light rays are directly reflected by the reflective coating 40 to form the main image of the head-up display image. Some of the projection light rays enter the head-up display glass 100. The projection light rays reaching the first surface 101 are reflected by the first surface 101 to form the secondary image of the head-up display image. In order to allow a clear and ghost-free head-up display image to be observed by the human eye, it is necessary to make the secondary image as unobservable as possible compared to the main image. Preferably, in the present application, the ratio of the reflectivity Rp4 of the head-up display glass with respect to the P-polarized light incident at an incident angle of 65° to the reflectivity Rp1 of the first surface 101 with respect to the P-polarized light reaching the first surface 101 is 25 or more. Specific examples of the ratio include 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, etc.

[0046] Figure 3 is a schematic diagram showing the imaging process of the head-up display system 200 provided by the embodiment of the present application.

[0047] Referring to Figure 3, the reflective coating 40 is installed on the fourth surface 302 of the inner layer glass 30.

[0048] The projection light rays projected by the projection device 210 are directly incident on the reflective coating 40, and a part of the projection light rays are directly reflected by the reflective coating 40 to form the main image 51 of the head-up display image. A part of the projection light rays pass through the reflective coating 40, the inner layer glass 30, the intermediate layer 20, and the outer layer glass 10 in sequence and reach the first surface 101. Then, a part of them is reflected by the first surface 101 to form the sub-image 52 of the head-up display image. The reflectivity of the reflective coating 40 of the present application with respect to P-polarized light is high, and a clear main image 51 can be formed. Due to the reflection of the reflective coating 40 and the absorption of the head-up display glass 100, the P-polarized light reaching the first surface 101 is significantly reduced. Based on the Brewster angle effect, the reflectivity of the first surface 101 with respect to the P-polarized light reaching the first surface 101 is low, making the sub-image 52 difficult to observe by the human eye.

[0049] FIG. 4 is a schematic diagram showing the structure of the first example of the reflective coating 40 of the head-up display glass 100 provided by the embodiment of the present application. FIG. 5 is a schematic diagram showing the structure of the second example of the reflective coating 40 of the head-up display glass 100 provided by the embodiment of the present application. FIG. 6 is a schematic diagram showing the structure of the third example of the reflective coating 40 of the head-up display glass 100 provided by the embodiment of the present application. FIG. 7 is a schematic diagram showing the structure of the fourth example of the reflective coating 40 of the head-up display glass 100 provided by the embodiment of the present application. FIG. 8 is a schematic diagram showing the structure of the fifth example of the reflective coating 40 of the head-up display glass 100 provided by the embodiment of the present application.

[0050] Referring to FIGS. 4 to 8, the reflective coating 40 includes at least one low-emission layer 41 and at least one laminated structure. Each laminated structure includes a high refractive index layer and a low refractive index layer that are sequentially laminated. The high refractive index layer in each laminated structure is closer to the fourth surface 302 than the low refractive index layer. The refractive index of the high refractive index layer is 1.8 or more, and the refractive index of the low refractive index layer is less than 1.8. The low-emission layer 41 may be located between the fourth surface 302 and at least one laminated structure, and / or may be located outside the low refractive index layer that is farthest from the fourth surface 302 in at least one laminated structure, and / or may be located within the laminated structure. When the low-emission layer 41 is located within the laminated structure, the low-emission layer 41 replaces the high refractive index layer of the laminated structure to form a "low-emission layer / low refractive index layer" structure. Specifically, for example, the reflective coating 40 can be "fourth surface 302 / low-emission layer / at least one laminated structure", or "fourth surface 302 / at least one laminated structure / low-emission layer", or "fourth surface 302 / low-emission layer / at least one laminated structure / low-emission layer", or "fourth surface 302 / at least one laminated structure / low-emission layer / low refractive index layer", or "fourth surface 302 / low-emission layer / low refractive index layer / at least one laminated structure", or "fourth surface 302 / low-emission layer / at least one laminated structure / low-emission layer / low refractive index layer", etc.

[0051] The material of the low-emissivity layer 41 is a transparent conductive oxide (TCO). For example, specifically, it can be indium tin oxide (ITO), fluone-dopted tin oxide (FTO), or doped zinc oxide. The doping element in the doped zinc oxide can include one or more of yttrium (Y), calcium (Ca), tin (Sn), indium (In), copper (Cu), magnesium (Mg), tungsten (W), hafnium (Hf), zirconium (Zr), aluminum (Al), silver (Ag), platinum (Pt), and gold (Au). For example, specifically, the doped zinc oxide can include aluminum-doped zinc oxide (AZO), hafnium-and aluminum-doped zinc oxide (HAZO), yttrium-doped zinc oxide (YZO), gallium-doped zinc oxide (GZO), etc. The low-emissivity layer 41 directly contacts the fourth surface 302 and / or directly contacts the low-refractive-index layer in at least one laminated structure. Since the thickness of the low-emissivity layer 41 is 30 nm or more, the head-up display glass 100 realizes the head-up display function and has heat insulation and low-emissivity functions. When the thickness of the low-emissivity layer 41 is 30 nm or more and 100 nm or less, the emissivity of the head-up display glass 100 measured inside the vehicle is 0.85 or less. When the thickness of the low-emissivity layer 41 is greater than 100 nm and 200 nm or less, the emissivity of the head-up display glass 100 measured inside the vehicle is 0.5 or less, preferably 0.4 or less, more preferably 0.3 or less, and even more preferably 0.25 or less. When the thickness of the low-emissivity layer 41 is greater than 200 nm, the emissivity of the head-up display glass 100 measured inside the vehicle is 0.2 or less.

[0052] The material of the high refractive index layer can include oxides such as zirconium (Zr), niobium (Nb), silicon (Si), antimony (Sb), tin (Sn), zinc (Zn), indium (In), aluminum (Al), nickel (Ni), chromium (Cr), magnesium (Mg), manganese (Mn), vanadium (V), tungsten (W), hafnium (Hf), tantalum (Ta), molybdenum (Mo), gallium (Ga), yttrium (Y), bismuth (Bi), titanium (Ti), or alloy oxides, or nitrides, or nitrogen oxides. For example, specifically, zinc tin oxide (ZnSnOx), titanium oxide (TiO x ), niobium oxide (NbO x ), silicon nitride (SiN x ), silicon aluminum nitride (SiAlN x ), silicon zirconium nitride (SiZrN x ), etc. can be mentioned, and the value of x is determined based on stoichiometry, sub-stoichiometry, or super-stoichiometry in the magnetron sputtering process. In order to better meet the comprehensive requirements of the window glass in terms of the optical performance, mechanical performance, appearance color, etc. of the reflective coating 40, the high refractive index layer can also be a single-layer structure or a multi-layer structure. For example, it can include at least two high refractive index sub-layers, and the refractive index difference between two adjacent high refractive index sub-layers can be 0.1 or more.

[0053] The material of the low refractive index layer can include oxides such as silicon (Si), aluminum (Al), magnesium (Mg), zirconium (Zr), or alloy oxides, or nitrogen oxides, or carbides, or fluorides. For example, specifically, silicon oxide (SiO2), silicon aluminum oxide (SiAlO x ), silicon zirconium oxide (SiZrO x) Examples include aluminum oxide (Al2O3), magnesium oxide (MgO), magnesium fluoride (MgF), etc. The value of x is determined based on stoichiometry, sub-stoichiometry, or super-stoichiometry in the magnetron sputtering process. In order to better meet the comprehensive requirements of window glass in terms of the optical performance, mechanical performance, appearance color, etc. of the reflective coating 40, the low refractive index layer can also be a single-layer structure or a multi-layer structure. For example, it includes at least two low refractive index sub-layers.

[0054] The reflective coating 40 can include a stacked structure of one "high refractive index layer / low refractive index layer", or can also include at least two stacked structures. For example, the reflective coating 40 can include two stacked structures, three stacked structures, or four stacked structures, etc.

[0055] In one possible embodiment, the total thickness of the low refractive index layer is thicker than the total thickness of the high refractive index layer.

[0056] In the first specific application scenario, as shown in FIG. 4, the reflective coating 40 includes one low-emissivity layer and a stacked structure of one "high refractive index layer / low refractive index layer". Specifically, on the fourth surface 302, a low-emissivity layer 41, a high refractive index layer 42, and a low refractive index layer 43 are sequentially installed.

[0057] In the second specific application scenario, as shown in FIG. 5, the reflective coating 40 includes one low-emissivity layer and a stacked structure of one "high refractive index layer / low refractive index layer", and one low refractive index layer is additionally installed between the low-emissivity layer and the high refractive index layer to form a "low-emissivity layer / low refractive index layer" structure, which is equivalent to the low-emissivity layer being located within one stacked structure and replacing the high refractive index layer in the stacked structure. Specifically, on the fourth surface 302, a low-emissivity layer 41, a first low refractive index layer 43a, a high refractive index layer 42, and a second low refractive index layer 43 are sequentially installed.

[0058] In the third specific application scenario, as shown in FIG. 6, the reflective coating 40 includes a laminated structure of one low-emissivity layer and two "high refractive index layer / low refractive index layer" stacks. Specifically, on the fourth surface 302, a low-emissivity layer 41, a first high refractive index layer 42a, a first low refractive index layer 43a, a second high refractive index layer 42b, and a second low refractive index layer 43b are sequentially installed. The material and thickness of the first low refractive index layer 43a and the material and thickness of the second low refractive index layer 43b may be the same or different. The material and thickness of the first high refractive index layer 42a and the material and thickness of the second high refractive index layer 42b may be the same or different.

[0059] In the fourth specific application scenario, as shown in FIG. 7, the reflective coating 40 includes a laminated structure of two low-emissivity layers and two "high refractive index layer / low refractive index layer" stacks. Specifically, on the fourth surface 302, a first low-emissivity layer 41a, a first high refractive index layer 42a, a first low refractive index layer 43a, a second high refractive index layer 42b, a second low refractive index layer 43b, and a second low-emissivity layer 41b are sequentially installed. The material and thickness of the first low-emissivity layer 41a and the material and thickness of the second low-emissivity layer 41b may be the same or different. The material and thickness of the first low refractive index layer 43a and the material and thickness of the second low refractive index layer 43b may be the same or different. The material and thickness of the first high refractive index layer 42a and the material and thickness of the second high refractive index layer 42b may be the same or different.

[0060] In the fifth specific application scenario, as shown in FIG. 8, the reflective coating 40 includes a laminated structure of one low-emissivity layer and three "high refractive index layer / low refractive index layer" stacks. Specifically, on the fourth surface 302, a low-emissivity layer 41, a first high refractive index layer 42a, a first low refractive index layer 43a, a second high refractive index layer 42b, a second low refractive index layer 43b, a third high refractive index layer 42c, and a third low refractive index layer 43c are sequentially installed. The material and thickness of the first low refractive index layer 43a, the second low refractive index layer 43b, and the third low refractive index layer 43c may be the same or different. The material and thickness of the first high refractive index layer 42a, the second high refractive index layer 42b, and the third high refractive index layer 42c may be the same or different.

[0061] Comparative Examples 1-3 and Examples 1-9

[0062] For easy understanding, terms related to the embodiments of this application will be described.

[0063] Thickness: It is the physical thickness.

[0064] Refractive index: It is the refractive index of transmitted light with a wavelength of 550 nm.

[0065] Incident angle: When the projection light beam generated by the projection device is incident on the head-up display glass, it is the angle between the projection light beam and the surface normal of the incident position.

[0066] Solar energy green glass with a thickness of 2.1 mm: Visible light transmittance TL ≥ 80%, solar energy direct transmittance TE ≤ 60%.

[0067] Ordinary green glass with a thickness of 2.1 mm: Visible light transmittance TL ≥ 80%, solar energy direct transmittance TE > 70%.

[0068] Transparent glass with a thickness of 2.1 mm: Visible light transmittance TL ≥ 90%, solar energy direct transmittance TE > 80%.

[0069] Standard PVB with a uniform thickness of 0.76 mm: Visible light transmittance TL ≥ 85%, solar energy direct transmittance TE > 80%.

[0070] Heat-insulating PVB with a uniform thickness of 0.76 mm: Visible light transmittance TL ≥ 80%, solar energy direct transmittance TE < 70%.

[0071] Transparent glass with a thickness of 1.6 mm: Visible light transmittance TL ≥ 90%, solar energy direct transmittance TE > 80%.

[0072] P-polarized light reflectance Rp: Measured on the inner layer glass 30 side, and based on ISO 9050, the reflectance of the head-up display glass 100 for the projection light incident at an incident angle of 65° is measured and calculated.

[0073] Ratio C of reflectance of main image to reflectance of sub-image: Measured on the inner layer glass 30 side, based on ISO 9050, measure and calculate the reflectance of the head-up display main image and the reflectance of the head-up display sub-image generated by the projection light incident at an incident angle of 65°, and calculate based on "Ratio of reflectance of main image to reflectance of sub-image = Reflectance of head-up display main image / Reflectance of head-up display sub-image".

[0074] Visible light reflectance RL4 of the fourth surface: Measured on the inner layer glass 30 side, based on ISO 9050, measure and calculate the reflectance of the head-up display glass 100 for visible light incident at an incident angle of 65°.

[0075] a value RL1(a) of the visible light reflection color of the first surface: Measured on the outer layer glass 10 side, in the case of an incident angle of 65°, calculate based on the CIE Lab color model based on the D65 light source and a 10° viewing angle, and the a value represents the values of red and green.

[0076] Visible light transmittance TL: Based on the standard ISO 9050, measure and calculate the visible light transmittance of the head-up display glass 100 for visible light incident at an incident angle of 8°.

[0077] Emissivity e: Measured on the inner layer glass 30 side, measured using a Fourier infrared spectrometer, and calculated and calibrated based on the standard EN12898.

[0078] Total solar energy transmittance Tts: Measure and calculate the total solar energy transmittance of the head-up display glass 100 based on the standard ISO 9050 at an incident angle of 8°.

[0079] Measuring on the inner layer glass side: It is to measure the light rays incident on the head-up display glass 100 from the inner layer glass 30 side, which is equivalent to measuring the light rays incident on the head-up display glass 100 from the inside of the vehicle after the head-up display glass 100 is installed on the vehicle.

[0080] Measured on the outer glass side: It is to measure the light beam incident on the head-up display glass 100 from the outer glass 10 side, which corresponds to measuring the light beam incident on the head-up display glass 100 from the outside of the vehicle after the head-up display glass 100 is attached to the vehicle.

[0081] Comparative Examples 1-2 and Examples 1-4

[0082] Prepare the outer glass 10, the intermediate layer 20 and the inner glass 30 of Comparative Examples 1-2 and Examples 1-4, and deposit the reflective coating 40 of Comparative Examples 1-2 and Examples 1-4 on the fourth surface 302 of the inner glass 30 by a process such as magnetron sputtering. Then, process and manufacture by the vehicle glass manufacturing process. The reflective coating 40 can withstand at least a high-temperature heat treatment of 560°C and a bending forming process, and obtain the head-up display glass 100 of Comparative Examples 1-2 and Examples 1-4.

[0083] For the outer glass 10, solar energy green glass with a thickness of 2.1 mm, ordinary green glass, or transparent glass (ordinary transparent glass) can be selected. For the intermediate layer 20, standard PVB or heat-insulating PVB with a thickness of 0.76 mm can be selected. For the inner glass 30, transparent glass with a thickness of 1.6 mm is selected.

[0084] Comparative Example 1

[0085] The outer glass 10 is solar energy green glass with a thickness of 2.1 mm, the intermediate layer 20 is heat-insulating PVB with a thickness of 0.76 mm, and the inner glass 30 is transparent glass with a thickness of 1.6 mm.

[0086] Reflective coating 40: Not installed.

[0087] Comparative Example 2

[0088] The outer glass 10 is a transparent glass with a thickness of 2.1 mm, the intermediate layer 20 is a standard PVB with a uniform thickness of 0.76 mm, and the inner glass 30 is a transparent glass with a thickness of 1.6 mm.

[0089] Reflection coating 40: On the fourth surface 302, SiAlN with a thickness of 28.6 nm x High refractive index layer, TiO with a thickness of 45.8 nm x High refractive index layer, SiO2 low refractive index layer with a thickness of 111 nm are sequentially deposited.

[0090] Example 1

[0091] The outer glass 10 is a transparent glass with a thickness of 2.1 mm, the intermediate layer 20 is a standard PVB with a uniform thickness of 0.76 mm, and the inner glass 30 is a transparent glass with a thickness of 1.6 mm.

[0092] Reflection coating 40: On the fourth surface 302, an ITO low-emission layer with a thickness of 163.6 nm, TiO with a thickness of 45.8 nm x High refractive index layer, SiO2 low refractive index layer with a thickness of 114.4 nm are sequentially deposited.

[0093] Example 2

[0094] The outer glass 10 is ordinary green glass with a thickness of 2.1 mm, the intermediate layer 20 is a standard PVB with a uniform thickness of 0.76 mm, and the inner glass 30 is a transparent glass with a thickness of 1.6 mm.

[0095] Reflection coating 40: On the fourth surface 302, an ITO low-emission layer with a thickness of 147.6 nm, TiO with a thickness of 58.4 nm x High refractive index layer, SiO2 low refractive index layer with a thickness of 105.3 nm are sequentially deposited.

[0096] Example 3

[0097] The outer glass 10 is solar energy green glass with a thickness of 2.1 mm, the intermediate layer 20 is standard PVB with a uniform thickness of 0.76 mm, and the inner glass 30 is transparent glass with a thickness of 1.6 mm.

[0098] Reflection coating 40: On the fourth surface 302, an ITO low-emissivity layer with a thickness of 30.9 nm, a TiO x high refractive index layer, and an SiO2 low refractive index layer with a thickness of 114.4 nm are sequentially deposited.

[0099] Example 4

[0100] The outer glass 10 is solar energy green glass with a thickness of 2.1 mm, the intermediate layer 20 is heat-insulating PVB with a uniform thickness of 0.76 mm, and the inner glass 30 is transparent glass with a thickness of 1.6 mm.

[0101] Reflection coating 40: On the fourth surface 302, an ITO low-emissivity layer with a thickness of 139.6 nm, an SiO2 low refractive index layer with a thickness of 176.2 nm, a TiO x high refractive index layer, and an SiO2 low refractive index layer with a thickness of 102.5 nm are sequentially deposited.

[0102] The head-up display glass 100 and the projection device 210 of Comparative Examples 1-2 and Examples 1-4 constitute a head-up display system 200. The projection device 210 generates a projection light beam containing at least 99% P-polarized light. The projection light beam is incident on the reflection coating 40 at an incident angle of 45° - 85°. The position of the projection device 210 and the incident angle of the projection light beam are adjusted so that the observer can observe the clearest head-up display image. The P-polarized light reflectivity Rp, the ratio C of the reflectivity of the main image to the reflectivity of the sub-image, the fourth surface visible light reflectivity RL4, the a value RL1(a) of the visible light reflection color of the first surface, the visible light transmittance TL, the emissivity e, the total solar energy transmittance Tts, etc. are measured, and the measurement results of Comparative Examples 1-2 and Examples 1-4 are entered in Table 1.

[0103]

Table 1

[0104] As can be seen from Table 1, for the head-up display glass of Comparative Example 1, since solar energy green glass and heat-insulating PVB were selected, the total solar energy transmittance Tts could be made less than 55%, and it had excellent heat-insulating performance. However, since the head-up display glass of Comparative Example 1 did not have a reflective coating, the P-polarized light reflectance Rp was less than 2%, the ratio C of the reflectance of the main image to the reflectance of the sub-image was less than 2, and the emissivity e was 0.9. That is, the head-up display glass of Comparative Example 1 could not realize a clear and ghost-free head-up display image and did not have low-emission performance either.

[0105] For the head-up display glass of Comparative Example 2, since a reflective coating without a low-emission layer was installed, a clear and ghost-free head-up display image could be realized. However, the a value RL1(a) of the visible light reflection color of the first surface was greater than 1, the emissivity e was 0.9, and the total solar energy transmittance Tts was greater than 70%. That is, when viewed from the outside of the vehicle, the head-up display glass of Comparative Example 2 was reddish in color and did not have heat-insulating performance or low-emission performance.

[0106] For the head-up display glass of Example 1, since a reflective coating containing a low-emission layer was installed, the P-polarized light reflectance Rp≥20%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≥28, the visible light reflectance RL4 of the fourth surface ≤25%, the a value RL1(a) of the visible light reflection color of the first surface ≤1, the visible light transmittance TL≥70%, the emissivity e≤0.2, and the total solar energy transmittance Tts≤65%. That is, the head-up display glass of Example 1 could not only realize a clear and ghost-free head-up display image but also had excellent low-emission performance. Compared with Comparative Example 2, Example 1 had excellent heat-insulating performance without selecting solar energy green glass and heat-insulating PVB.

[0107] Since the head-up display glass of Example 2 is provided with a reflective coating including a low-emission layer, the P-polarized light reflectance Rp ≥ 20%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≥ 30, the visible light reflectance RL4 of the fourth surface ≤ 25%, the a value RL1(a) of the visible light reflection color of the first surface ≤ 1, the visible light transmittance TL ≥ 70%, the emissivity e ≤ 0.25, and the total solar energy transmittance Tts ≤ 65%. That is, the head-up display glass of Example 2 can not only realize a clear and ghost-free head-up display image, but also has excellent low-emission performance. Compared with Comparative Example 2, Example 2 has excellent heat insulation performance without selecting solar energy green glass and heat insulation PVB.

[0108] Since the head-up display glass of Example 3 is provided with a reflective coating including a low-emission layer, the P-polarized light reflectance Rp ≥ 18%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≥ 35, the visible light reflectance RL4 of the fourth surface ≤ 25%, the a value RL1(a) of the visible light reflection color of the first surface ≤ 1, the visible light transmittance TL ≥ 70%, the emissivity e ≤ 0.85, and the total solar energy transmittance Tts ≤ 60%. That is, the head-up display glass of Example 3 can not only realize a clear and ghost-free head-up display image, but also has excellent heat insulation performance and low-emission performance. Compared with Example 1 and Example 2, Example 3 has a small change in the P-polarized light reflectance Rp, significantly improves the ratio C of the reflectance of the main image to the reflectance of the sub-image, and can obtain a clearer and ghost-free head-up display image.

[0109] The head-up display glass of Example 4 is provided with a reflective coating including a low-emission layer, so that the P-polarized light reflectance Rp ≥ 20%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≥ 40, the visible light reflectance RL4 of the fourth surface ≤ 25%, the a value RL1(a) of the visible light reflection color of the first surface ≤ 1, the visible light transmittance TL ≥ 70%, the emissivity e ≤ 0.25, and the total solar energy transmittance Tts ≤ 45%. That is, the head-up display glass of Example 4 can not only realize a clear and ghost-free head-up display image, but also has excellent heat insulation performance and low-emission performance. Compared with Examples 1 to 3, the reflective coating of Example 4 is specifically a "low-emission layer / low refractive index layer / layered structure", which means that the low-emission layer is located within a layered structure and is equivalent to replacing the high refractive index layer in the layered structure. Thereby, the ratio C of the reflectance of the main image to the reflectance of the sub-image of the head-up display glass of Example 4 is further increased.

[0110] Comparative Example 3 and Examples 5 to 9

[0111] Prepare the outer glass 10, the intermediate layer 20, and the inner glass 30 of Comparative Example 3 and Examples 5 to 9. For the outer glass 10, select solar energy green glass with a thickness of 2.1 mm. For the intermediate layer 20, select heat-insulating PVB with a thickness of 0.76 mm. For the inner glass 30, select transparent glass with a thickness of 1.6 mm. By processes such as magnetron sputtering, deposit the reflective coating 40 of Comparative Example 3 and Examples 5 to 9 on the fourth surface 302 of the inner glass 30, and then process and manufacture by the vehicle glass manufacturing process. The reflective coating 40 can withstand at least a high-temperature heat treatment of 560°C and a bending forming process, and obtain the head-up display glass 100 of Comparative Example 3 and Examples 5 to 9.

[0112] Comparative Example 3

[0113] Reflective coating 40: On the fourth surface 302, SiAlN with a thickness of 58.4 nm x High refractive index layer, TiO with a thickness of 78.9 nm xA high refractive index layer, a SiO2 low refractive index layer with a thickness of 161.3 nm, and a TiO with a thickness of 27.5 nm x A high refractive index layer and a SiO2 low refractive index layer with a thickness of 107.1 nm are sequentially deposited.

[0114] Example 5

[0115] Reflection coating 40: On the fourth surface 302, an ITO low-emission layer with a thickness of 57.2 nm, and a TiO with a thickness of 83.5 nm x A high refractive index layer, a SiO2 low refractive index layer with a thickness of 161.3 nm, and a TiO with a thickness of 46.9 nm x A high refractive index layer and a SiO2 low refractive index layer with a thickness of 107.1 nm are sequentially deposited.

[0116] Example 6

[0117] Reflection coating 40: On the fourth surface 302, an ITO low-emission layer with a thickness of 175.1 nm, and a TiO with a thickness of 96.1 nm x A high refractive index layer, a SiO2 low refractive index layer with a thickness of 161.3 nm, and a TiO with a thickness of 46.9 nm x A high refractive index layer and a SiO2 low refractive index layer with a thickness of 107.1 nm are sequentially deposited.

[0118] Example 7

[0119] Reflection coating 40: On the fourth surface 302, an ITO low-emission layer with a thickness of 211.7 nm, and a TiO with a thickness of 101.8 nm x A high refractive index layer, a SiO2 low refractive index layer with a thickness of 173.9 nm, and a TiO with a thickness of 43.5 nm x A high refractive index layer and a SiO2 low refractive index layer with a thickness of 100.2 nm are sequentially deposited.

[0120] Example 8

[0121] Reflection coating 40: On the fourth surface 302, an ITO low-emission layer with a thickness of 652.2 nm, and a TiO with a thickness of 101.8 nm xA high refractive index layer, a SiO2 low refractive index layer with a thickness of 173.9 nm, and a TiO with a thickness of 43.5 nm x A high refractive index layer, a SiO2 low refractive index layer with a thickness of 72.3 nm, and an ITO low emissivity layer with a thickness of 21.7 nm are sequentially deposited.

[0122] Example 9

[0123] Reflection coating 40: On the fourth surface 302, an ITO low emissivity layer with a thickness of 961.1 nm, a TiO with a thickness of 17.2 nm x A high refractive index layer, a SiO2 low refractive index layer with a thickness of 52.6 nm, a TiO with a thickness of 17.8 nm x A high refractive index layer, a SiO2 low refractive index layer with a thickness of 64.1 nm, a TiO with a thickness of 59.5 nm x A high refractive index layer, a SiO2 low refractive index layer with a thickness of 96.1 nm are sequentially deposited.

[0124] The head-up display glass 100 and the projection device 210 of Comparative Example 3 and Examples 5 to 9 constitute a head-up display system 200. The projection device 210 generates a projection light beam containing at least 99% P-polarized light. The projection light beam is incident on the reflection coating 40 at an incident angle of 45° to 85°. The position of the projection device 210 and the incident angle of the projection light beam are adjusted so that the observer can observe the clearest head-up display image. The P-polarized light reflectivity Rp, the ratio C of the reflectivity of the main image to the reflectivity of the sub-image, the fourth surface visible light reflectivity RL4, the a value RL1(a) of the visible light reflection color of the first surface, the visible light transmittance TL, the emissivity e, the total solar energy transmittance Tts, etc. are measured, and the measurement results of Comparative Example 3 and Examples 5 to 9 are entered in Table 2.

[0125]

Table 2

[0126] As can be seen from Table 2, since the head-up display glass of Comparative Example 3 was provided with a reflective coating that does not include a low-emissivity layer, a clear and ghost-free head-up display image can be realized, but the emissivity e is 0.9 and it does not have low-emission performance.

[0127] Since the head-up display glass of Example 5 was provided with a reflective coating that includes a low-emissivity layer, the P-polarized reflectance Rp ≧ 25%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≧ 60, the visible light reflectance RL4 of the fourth surface ≦ 30%, the a value RL1(a) of the visible light reflection color of the first surface ≦ 1, the visible light transmittance TL ≧ 70%, the emissivity e ≦ 0.80, and the total solar energy transmittance Tts ≦ 50%. That is, the head-up display glass of Example 5 can not only realize a clear and ghost-free head-up display image, but also has excellent heat insulation performance and low-emission performance.

[0128] Since the head-up display glass of Example 6 was provided with a reflective coating that includes a low-emissivity layer, the P-polarized reflectance Rp ≧ 20%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≧ 55, the visible light reflectance RL4 of the fourth surface ≦ 30%, the a value RL1(a) of the visible light reflection color of the first surface ≦ 1, the visible light transmittance TL ≧ 70%, the emissivity e ≦ 0.20, and the total solar energy transmittance Tts ≦ 45%. That is, the head-up display glass of Example 6 can not only realize a clear and ghost-free head-up display image, but also has excellent heat insulation performance and low-emission performance.

[0129] Since the head-up display glass of Example 7 is provided with a reflective coating including a low-emission layer, the P-polarized light reflectance Rp ≥ 20%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≥ 50, the visible light reflectance RL4 of the fourth surface ≤ 30%, the a value RL1(a) of the visible light reflection color of the first surface ≤ 1, the visible light transmittance TL ≥ 70%, the emissivity e ≤ 0.20, and the total solar energy transmittance Tts ≤ 45%. That is, the head-up display glass of Example 7 can not only realize a clear and ghost-free head-up display image, but also has excellent heat insulation performance and low-emission performance.

[0130] Since the head-up display glass of Example 8 is provided with a reflective coating including a low-emission layer, the P-polarized light reflectance Rp ≥ 20%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≥ 40, the visible light reflectance RL4 of the fourth surface ≤ 25%, the a value RL1(a) of the visible light reflection color of the first surface ≤ 1, the visible light transmittance TL ≥ 70%, the emissivity e ≤ 0.1, and the total solar energy transmittance Tts ≤ 40%. That is, the head-up display glass of Example 8 can not only realize a clear and ghost-free head-up display image, but also has excellent heat insulation performance and low-emission performance.

[0131] Since the head-up display glass of Example 9 is provided with a reflective coating including a low-emission layer, the P-polarized light reflectance Rp ≥ 20%, the ratio C of the reflectance of the main image to the reflectance of the sub-image ≥ 45, the visible light reflectance RL4 of the fourth surface ≤ 25%, the a value RL1(a) of the visible light reflection color of the first surface ≤ 1, the visible light transmittance TL ≥ 70%, the emissivity e ≤ 0.1, and the total solar energy transmittance Tts ≤ 45%. That is, the head-up display glass of Example 9 can not only realize a clear and ghost-free head-up display image, but also has excellent heat insulation performance and low-emission performance.

[0132] The above has introduced the embodiments of this application in detail. In the text, specific examples are given to explain the principle and implementation form of this application. The description of the above embodiments is used to assist in the understanding of the method of this application and its core idea. For those skilled in the art, based on the idea of this application, the specific implementation form and application scope can be changed. As described above, the content of this specification should not be understood as a limitation to this application.

Claims

1. A head-up display glass, comprising: an outer layer glass, an inner layer glass, an intermediate layer, and a reflective coating, wherein the outer layer glass includes a first surface and a second surface disposed opposite to each other, the inner layer glass includes a third surface and a fourth surface disposed opposite to each other, the third surface and the second surface are disposed opposite to each other, the intermediate layer is disposed between the second surface and the third surface, the reflective coating is disposed on the fourth surface, and the reflective coating can reflect P-polarized light; the reflective coating includes at least one low-emissivity layer and at least one laminated structure laminated thereon, each of the laminated structures includes a high refractive index layer and a low refractive index layer laminated in sequence, the high refractive index layer in each of the laminated structures is closer to the fourth surface than the low refractive index layer, the refractive index of the high refractive index layer is 1.8 or more, and the refractive index of the low refractive index layer is less than 1.8; A glass for a head-up display, characterized in that.

2. The material of the low-emissivity layer is ITO, FTO, or doped zinc oxide, and the doping element in the doped zinc oxide includes at least one of yttrium (Y), calcium (Ca), tin (Sn), indium (In), copper (Cu), magnesium (Mg), tungsten (W), hafnium (Hf), zirconium (Zr), aluminum (Al), silver (Ag), platinum (Pt), and gold (Au); The head-up display glass according to claim 1, characterized in that.

3. When the thickness of the low-emissivity layer is 30 nm or more and 100 nm or less, the emissivity of the head-up display glass measured on the inner layer glass side is 0.85 or less; The head-up display glass according to claim 1, characterized in that.

4. When the thickness of the low-emissivity layer is greater than 100 nm and 200 nm or less, the emissivity of the head-up display glass measured on the inner layer glass side is 0.5 or less; The head-up display glass according to claim 1, characterized in that.

5. When the thickness of the low-emissivity layer is greater than 200 nm, the emissivity of the head-up display glass measured on the inner layer glass side is 0.2 or less; The head-up display glass according to claim 1, characterized in that.

6. The at least one low-emissivity layer is in direct contact with the fourth surface and / or the low refractive index layer. The head-up display glass according to any one of claims 1 to 5, characterized in that...

7. The total thickness of the low refractive index layer is thicker than the total thickness of the high refractive index layer. The head-up display glass according to any one of claims 1 to 5, characterized in that...

8. The outer layer glass is colored glass, the direct solar energy transmittance of the outer layer glass is less than 70%, the visible light transmittance of the outer layer glass is greater than 80%, and the absorption rate of the outer layer glass for P-polarized light is 3% or more. The head-up display glass according to any one of claims 1 to 5, characterized in that...

9. The intermediate layer is a rectangular intermediate layer or a wedge-shaped intermediate layer with a wedge angle of 0.01 mrad to 0.18 mrad. The head-up display glass according to any one of claims 1 to 5, characterized in that...

10. The total solar energy transmittance of the head-up display glass is 65% or less. The head-up display glass according to any one of claims 1 to 5, characterized in that...

11. The reflectance of the head-up display glass for P-polarized light incident at an incident angle of 65° is 18% or more. The head-up display glass according to any one of claims 1 to 5, characterized in that...

12. The reflectance of the head-up display glass for P-polarized light with wavelengths of 469 nm, 532 nm, and 629 nm incident at an incident angle of 65° is all 13% or more. The head-up display glass according to any one of claims 1 to 5, characterized in that...

13. The ratio of the reflectance of the main image to the reflectance of the sub-image of the head-up display glass for P-polarized light incident at an incident angle of 65° is 25 or more. The head-up display glass according to any one of claims 1 to 5, characterized in that...

14. The visible light transmittance of the head-up display glass is 70% or more. Among the Lab values of the reflected color of the head-up display glass for visible light incident at an incident angle of 65° measured on the outer layer glass side, the a value is 1 or less, and the reflectance of the head-up display glass for visible light incident at an incident angle of 65° measured on the inner layer glass side is less than 30%. The head-up display glass according to any one of claims 1 to 5, characterized in that...

15. The reflective coating includes two low-emissivity layers, one low-emissivity layer is located between the fourth surface and the at least one laminated structure, and the other low-emissivity layer is located outside the low-refractive-index layer farthest from the fourth surface in the at least one laminated structure. The head-up display glass according to any one of claims 1 to 5, characterized in that.

16. At least one low-emissivity layer is located within the at least one laminated structure, and the low-emissivity layer located within the laminated structure forms a "low-emissivity layer / low-refractive-index layer" structure in place of the high-refractive-index layer of the laminated structure. The head-up display glass according to any one of claims 1 to 5, characterized in that.

17. The total thickness of the low-refractive-index layer in the reflective coating is thicker than the total thickness of the high-refractive-index layer. The head-up display glass according to any one of claims 1 to 5, characterized in that.

18. The visible light transmittance of the outer layer glass is 80% or more, the direct solar energy transmittance of the outer layer glass is 60% or less, the visible light transmittance of the intermediate layer is 80% or more, and the direct solar energy transmittance of the intermediate layer is less than 70%. The head-up display glass according to any one of claims 1 to 5, characterized in that.

19. The high-refractive-index layer includes at least two high-refractive-index sub-layers, the refractive index difference between two adjacent high-refractive-index sub-layers is 0.1 or more, and / or the low-refractive-index layer includes at least two low-refractive-index sub-layers. The head-up display glass according to any one of claims 1 to 5, characterized in that.

20. A head-up display system, including a projection device and the head-up display glass according to any one of claims 1 to 19, the projection device is used to generate projection light rays including at least 80% P-polarized light, and the projection light rays are incident on the reflective coating at an incident angle of 45° to 85°. The head-up display system, characterized in that.

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