Laminated glass and head up display system

Abstract

The present application provides laminated glass and a head up display system. The laminated glass comprises an outer glass pane, an inner glass pane, a bonding layer, and a reflective coating. The reflective coating is provided on a second surface or a third surface of the laminated glass, and is used for reflecting P‑polarized light. When measured from the side of a fourth surface, the laminated glass has minimum reflectance for P-polarized light that is incident at an angle of incidence of 65° and has a wavelength falling within a range of 450-650 nm, wherein the minimum reflectance is greater than or equal to 13%. When measured from the side of a first surface, the laminated glass has reflected color Lab values for visible light that is incident at an angle of incidence of at least one of 55°, 60°, 65°, 70°, 75° and 80° and has a wavelength falling within a range of 380-780 nm, wherein a and b values satisfy that -2≤a≤2 and -2≤b≤2. The laminated glass and the head up display system provided by the present application have good head up display and neutral appearance color effects.

Description

Laminated glass and head-up display system

[0001] This application claims priority to Chinese Patent Application No. 2024112138209, filed with the China Patent Office on August 31, 2024, entitled "Laminated Glass and Head-Up Display System", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of head-up display technology, specifically to a laminated glass and head-up display system. Background Technology

[0003] Head-up display (HUD) systems are increasingly used in fields such as automobiles, and laminated glass is one of the key design elements in HUDs. However, current HUD designs struggle to balance the requirements of head-up display with a neutral color scheme. Summary of the Invention

[0004] This application provides a laminated glass and head-up display system with good head-up display and neutral color effect.

[0005] On one hand, this application provides a laminated glass, comprising:

[0006] The outer glass panel includes a first surface and a second surface disposed opposite to each other;

[0007] The inner glass panel includes a third surface and a fourth surface disposed opposite to each other;

[0008] An adhesive layer is disposed between the second surface and the third surface, and connects the outer glass plate and the inner glass plate; and

[0009] A reflective coating is provided on the second surface or the third surface for reflecting P-polarized light;

[0010] Measured from one side of the fourth surface, the laminated glass has a minimum reflectivity of 13% or greater for P-polarized light with wavelengths in the range of 450 nm to 650 nm incident at an incident angle of 65°.

[0011] Measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least one incident angle of 55°, 60°, 65°, 70°, 75° and 80°, and the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2.

[0012] In one possible embodiment, measured from the fourth surface side, the laminated glass has a maximum reflectivity for P-polarized light with wavelengths in the range of 450nm-650nm incident at an incident angle of 65°, and the difference between the maximum reflectivity and the minimum reflectivity is less than or equal to 4%.

[0013] In one possible embodiment, -1≤a≤1, and / or -1≤b≤1.

[0014] In one possible embodiment, measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least two incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2;

[0015] Alternatively, measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least three incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2;

[0016] Alternatively, measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least four incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2;

[0017] Alternatively, measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm that is incident at at least five incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2;

[0018] Alternatively, measured from the first surface side, the laminated glass has a reflective color Lab value for visible light in the wavelength range of 380nm-780nm incident at all incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2.

[0019] In one possible embodiment, the reflective coating includes a conductive reflective layer and a color adjustment layer, wherein the conductive reflective layer is made of silver metal or a silver alloy, and the silver alloy is an alloy of silver with at least one of gold, aluminum, copper, indium, nickel, chromium, tin, titanium and platinum.

[0020] The color adjustment layer is closer to the adhesive layer than the conductive reflective layer. The color adjustment layer includes at least one high refractive index layer and at least one low refractive index layer stacked together. The high refractive index layer and the low refractive index layer are alternately arranged. The refractive index of the high refractive index layer is greater than or equal to 1.8, and the refractive index of the low refractive index layer is less than 1.8.

[0021] In one possible embodiment, the reflective coating further includes a dielectric layer, which is directly disposed on the second surface or the third surface, and the conductive reflective layer is directly disposed on the dielectric layer. The physical thickness of the dielectric layer is 20 nm to 80 nm, and the refractive index of the dielectric layer is greater than or equal to 1.9.

[0022] In one possible embodiment, the dielectric layer comprises 2 to 5 dielectric sublayers, wherein the material of any dielectric sublayer is selected from at least one oxide, nitride, or oxynitride of zinc, titanium, silicon, aluminum, tin, zirconium, nickel, indium, chromium, tungsten, gallium, yttrium, niobium, copper, samarium, antimony, magnesium, manganese, vanadium, hafnium, tantalum, molybdenum, and bismuth.

[0023] In one possible embodiment, at least one high refractive index layer comprises 2 to 5 high refractive index sublayers, wherein the difference in refractive index between two adjacent high refractive index sublayers is greater than or equal to 0.1.

[0024] In one possible embodiment, the reflective coating further includes a barrier layer disposed between the conductive reflective layer and the color adjustment layer, the barrier layer being in direct contact with the conductive reflective layer, the material of the barrier layer being selected from at least one element or alloy of titanium, copper, zirconium, niobium, silicon, antimony, tin, zinc, indium, aluminum, nickel, chromium, magnesium, and manganese, the physical thickness of the conductive reflective layer being 8 nm to 20 nm, and the physical thickness of the barrier layer being 0.5 nm to 5 nm.

[0025] In one possible embodiment, the physical thickness of any of the high refractive index layers is 5 nm to 80 nm, and the physical thickness of any of the low refractive index layers is 20 nm to 80 nm.

[0026] In one possible embodiment, the difference between the total physical thickness of all high refractive index layers and the total physical thickness of all low refractive index layers in the color adjustment layer is less than or equal to 30 nm.

[0027] In one possible embodiment, the total physical thickness of all high refractive index layers in the color adjustment layer is greater than the total physical thickness of all low refractive index layers.

[0028] In one possible embodiment, the reflective coating further includes a protective layer disposed on the side of the color adjustment layer opposite to the conductive reflective layer. The protective layer is the layer of the reflective coating closest to the adhesive layer, and the physical thickness of the protective layer is 7 nm to 25 nm. The material of the protective layer is selected from at least one nitride or oxide of zinc, titanium, silicon, aluminum, tin, zirconium, nickel, indium, chromium, tungsten, gallium, yttrium, niobium, copper, samarium, antimony, magnesium, manganese, vanadium, hafnium, tantalum, molybdenum, and bismuth.

[0029] In one possible embodiment, the total solar transmittance of the laminated glass is less than or equal to 62%, and the visible light transmittance of the laminated glass is greater than 70%.

[0030] In one possible embodiment, the total physical thickness of the reflective coating is less than or equal to 230 nm, and the sheet resistance of the reflective coating is less than 5 Ω / □.

[0031] On the other hand, this application also provides a head-up display system, including a projection device and the laminated glass, wherein the projection device is used to generate projection light, the projection light contains at least 80% P-polarized light, and the projection light is incident on a fourth surface of the laminated glass at an incident angle of 55° to 80°.

[0032] The laminated glass and head-up display system provided in this application have a reflective coating on the second surface of the outer glass plate or the third surface of the inner glass plate. This coating, when measured from the fourth surface, results in a minimum reflectivity of 13% or greater for P-polarized light with wavelengths in the 450nm-650nm range incident at a 65° angle of incidence. This ensures high reflectivity for the main projection light used to achieve the head-up display function, guaranteeing a good head-up display effect. When measured from the first surface, the laminated glass has a reflective color Lab value for visible light with wavelengths in the 380nm-780nm range incident at at least one of the angles of incidence (55°, 60°, 65°, 70°, 75°, and 80°). The a and b values ​​satisfy -2≤a≤2 and -2≤b≤2, making the reflected light from the laminated glass neutral in color, thus ensuring a good neutral color appearance. Attached Figure Description

[0033] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0034] Figure 1 is a schematic diagram of a head-up display system provided in this application;

[0035] Figure 2 is a cross-sectional schematic diagram of one embodiment of the laminated glass provided in this application;

[0036] Figure 3 is a cross-sectional schematic diagram of another embodiment of the laminated glass provided in this application;

[0037] Figure 4 is a cross-sectional schematic diagram of one embodiment of the reflective coating provided in this application;

[0038] Figure 5 is a cross-sectional schematic diagram of another embodiment of the reflective coating provided in this application;

[0039] Figure 6 is a cross-sectional schematic diagram showing that the reflective coating shown in Figure 4 also includes a dielectric layer;

[0040] Figure 7 is a cross-sectional schematic diagram showing that the reflective coating shown in Figure 4 also includes a barrier layer;

[0041] Figure 8 is a cross-sectional schematic diagram showing that the reflective coating shown in Figure 4 also includes a dielectric layer and a barrier layer;

[0042] Figure 9 is a cross-sectional schematic diagram showing that the reflective coating shown in Figure 8 also includes a protective layer;

[0043] Figure 10 shows the reflectance spectrum curves of Examples 1-5 provided in Tables 1 and 2 of this application;

[0044] Figure 11 is a reflection spectrum curve of Examples 6-10 provided in Tables 3 and 4 of this application.

[0045] Explanation of reference numerals in the attached drawings: Head-up display system 1000; Projection device 200; Projection beam 21; Laminated glass 100; Outer glass plate 10; Inner glass plate 20; Adhesive layer 30; Reflective coating 40; First surface 101; Second surface 102; Third surface 201; Fourth surface 202; Conductive reflective layer 401; Color adjustment layer 402; High refractive index layer 420; Low refractive index layer 421; Dielectric layer 403; Barrier layer 404; Protective layer 406. Detailed Implementation

[0046] The technical solutions provided in this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort are within the protection scope of this application.

[0047] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0048] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device that includes one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0049] Please refer to Figure 1, which is a schematic diagram of a head-up display system 1000 provided in this application. The head-up display system 1000 includes a projection device 200 and a laminated glass 100. The laminated glass 100 has an outer surface facing the outside of the vehicle and an inner surface facing the inside of the vehicle. The projection light 21 generated by the projection device 200 is incident on the inner surface of the laminated glass 100 at an incident angle θ. The laminated glass 100 can reflect the projection light 21 to form a head-up display image observed by the human eye. The incident angle θ is the angle between the projection light generated by the projection device 200 and the surface normal of the inner surface when the projection light is incident on the inner surface of the laminated glass 100.

[0050] Please refer to Figures 2 and 3. Figure 2 is a cross-sectional schematic diagram of one embodiment of the laminated glass 100 provided in this application, and Figure 3 is a cross-sectional schematic diagram of another embodiment of the laminated glass 100 provided in this application. The laminated glass 100 includes an outer glass panel 10, an inner glass panel 20, an adhesive layer 30, and a reflective coating 40. When the laminated glass 100 is installed in a vehicle, it is located outside the vehicle, and the inner glass panel 20 is located inside the vehicle. The adhesive layer 30 connects the outer glass panel 10 and the inner glass panel 20, and the reflective coating 40 is disposed between the outer glass panel 10 and the inner glass panel 20. In this application, the laminated glass 100 can be a windshield.

[0051] In one or more embodiments of this application, unless otherwise specified, visible light transmittance (TL) represents the transmittance of laminated glass 100 to vertically incident visible light, calculated according to standard ISO 9050; the a-value represents the red-green value of the visible light reflected at a specified incident angle, calculated based on the CIE 1976 Lab color space and D65 light source; the b-value represents the yellow-blue value of the visible light reflected at a specified incident angle, calculated based on the CIE 1976 Lab color space and D65 light source; and the total solar transmittance (TTS) is calculated according to standard ISO 9050.

[0052] The outer glass panel 10 includes a first surface 101 and a second surface 102 disposed opposite to each other. The inner glass panel 20 includes a third surface 201 and a fourth surface 202 disposed opposite to each other. When the laminated glass 100 is used as a windshield, the first surface 101 faces outward of the vehicle and serves as the outer surface of the laminated glass 100, while the fourth surface 202 faces inward of the vehicle and serves as the inner surface of the laminated glass 100. The outer glass panel 10 is transparent or tinted glass, with a thickness of 0.7 mm to 4.0 mm and a visible light transmittance greater than or equal to 80%. The inner glass panel 20 is also transparent or tinted glass, with a thickness of 0.7 mm to 4.0 mm and a visible light transmittance greater than or equal to 80%. The total iron content (calculated as Fe2O3) of the transparent glass is less than or equal to 0.1%, even less than or equal to 0.05%, and further less than or equal to 0.01%, and the visible light transmittance of the transparent glass is 80% to 95%. The total iron content (calculated as Fe2O3) of the tinted glass is 0.1% to 0.8%, preferably 0.1% to 0.5%, and the visible light transmittance of the tinted glass is 80% to 90%. For example, the outer glass plate 10 can be a 2.1 mm thick transparent glass with a visible light transmittance of 89%, and the inner glass plate 20 can be a 1.6 mm thick green glass with a visible light transmittance of 83%, or a 2.1 mm thick green glass with a visible light transmittance of 80%. The thickness of the outer glass plate 10 and the inner glass plate 20 can be the same or different. In the following embodiments, unless otherwise specified, the thickness of the outer glass plate 10 and the inner glass plate 20 is the same as an example.

[0053] An adhesive layer 30 is disposed between the second surface 102 and the third surface 201, connecting the outer glass plate 10 and the inner glass plate 20. It is understood that the second surface 102 of the outer glass plate 10 and the third surface 201 of the inner glass plate 20 are connected by the adhesive layer 30. This application does not specifically limit the material of the adhesive layer 30. Optionally, the material of the adhesive layer 30 may include polyvinyl butyral (PVB) or ethylene-vinyl acetate copolymer (EVA). This application does not specifically limit the thickness of the adhesive layer 30. Optionally, the thickness of the adhesive layer 30 is less than the thickness of the outer glass plate 10. In one possible embodiment, the material of the adhesive layer 30 may be PVB, and the thickness of the adhesive layer 30 may be 0.76 mm. The cross-section of the adhesive layer 30 may be rectangular or wedge-shaped.

[0054] The adhesive layer 30 is a transparent or colored thermoplastic polymer film, and the thickness of the adhesive layer 30 is 0.38 mm to 2.28 mm. For example, the thickness of the adhesive layer 30 can be, but is not limited to, 0.38 mm, 0.76 mm, 1.14 mm, 1.52 mm, 1.9 mm, 2.28 mm, or other values ​​between 0.38 mm and 2.28 mm. The material of the thermoplastic polymer film can be selected from at least one of polyvinyl butyral (PVB), polyurethane (PU), ethylene-vinyl acetate copolymer (EVA), and ionic polymer (Sentry Glas Plus, SGP). When the adhesive layer 30 is a transparent thermoplastic polymer, the visible light transmittance of the transparent thermoplastic polymer is greater than or equal to 80%. For example, the visible light transmittance of the adhesive layer 30 can be, but is not limited to, 80%, 85%, 90%, or 95%. When the adhesive layer 30 is a colored thermoplastic polymer film, the visible light transmittance of the colored thermoplastic polymer film is greater than or equal to 80%. For example, the visible light transmittance of the adhesive layer 30 can be, but is not limited to, 80%, 85%, or 90%. The colored thermoplastic polymer film can be a gray thermoplastic polymer film, a green thermoplastic polymer film, or a blue thermoplastic polymer film. Exemplarily, the adhesive layer 30 can be a single-layer structure or a multi-layer structure. Examples of multi-layer structures include double-layer, triple-layer, quadruple-layer, and five-layer structures. The adhesive layer 30 may also have other functions, such as setting at least one colored area as a shaded area to reduce the interference of sunlight on the human eye, or adding an infrared absorber to have sun protection or heat insulation functions, or adding an ultraviolet absorber to have ultraviolet protection functions, or having a higher plasticizer content in at least one layer of the multi-layer structure to have sound insulation functions.

[0055] A reflective coating 40 is disposed on the second surface 102 or the third surface 201 to reflect the projected light 21 to form a head-up display image. In this application, the reflective coating 40 is formed by sequentially stacking multiple film layers. The reflective coating 40 disposed on the second surface 102 can be disposed in any area of ​​the second surface 102, or it can cover the entire second surface 102. The reflective coating 40 disposed on the third surface 201 can be disposed in any area of ​​the third surface 201, or it can cover the entire third surface 201. As shown in FIG2, in the embodiment where the reflective coating 40 is disposed on the second surface 102, the reflective coating 40 can be directly deposited on the second surface 102 of the outer glass plate 10. In this embodiment, the laminated glass 100 includes the outer glass plate 10, the reflective coating 40, the adhesive layer 30, and the inner glass plate 20, which are sequentially stacked. As shown in Figure 3, in the embodiment where the reflective coating 40 is disposed on the third surface 201, the reflective coating 40 can be directly deposited on the third surface 201 of the inner glass plate 20. In this embodiment, the laminated glass 100 includes an outer glass plate 10, an adhesive layer 30, a reflective coating 40, and an inner glass plate 20 arranged in sequence.

[0056] The wavelength of the projection light 21 can be in the range of 380nm to 780nm. The projection light 21 can contain at least 80% P-polarized light. The higher the proportion of P-polarized light in the projection light 21, the better it meets the usage needs of drivers wearing sunglasses and the easier it is to eliminate visual ghosting phenomena in the head-up display image. For example, the projection light 21 contains at least 85% P-polarized light, or at least 90% P-polarized light, or at least 95% P-polarized light, or even 100% P-polarized light, that is, the projection light 21 is essentially pure P-polarized light.

[0057] To eliminate image ghosting in head-up displays, traditional windshields typically employ an adhesive layer 30 with a wedge angle of at least 0.3 mrad. This makes the design, production, and debugging of the head-up display system 1000 difficult, resulting in poor imaging quality. The laminated glass 100 provided in this application utilizes a reflective coating 40 and projection light with a P-polarized light ratio greater than or equal to 80% to achieve the head-up display function. It can use a common, uniformly thick adhesive layer 30, saving costs and reducing the difficulty of design, production, and debugging. The wedge angle of the uniformly thick adhesive layer 30 is essentially 0, and its cross-sectional shape is roughly rectangular. It is understood that this application may also use an adhesive layer 30 with a smaller wedge angle, such as 0.01 to 0.15 mrad, for example, 0.01 mrad, 0.02 mrad, 0.03 mrad, 0.04 mrad, 0.05 mrad, 0.06 mrad, 0.07 mrad, 0.08 mrad, 0.09 mrad, 0.10 mrad, 0.11 mrad, 0.12 mrad, 0.13 mrad, 0.14 mrad, 0.15 mrad, etc. This can further eliminate the perspective ghosting caused by objects in the vehicle's external environment passing through the laminated glass 100. The adhesive layer 30 with a smaller wedge angle can be obtained through a simple stretching process, thereby eliminating both reflection ghosting and perspective ghosting in a low-cost manner, and obtaining higher quality head-up display images and viewing effects.

[0058] Measured from the fourth surface 202 side, the laminated glass 100 has a minimum reflectivity of 13% or greater for P-polarized light with wavelengths in the range of 450nm-650nm incident at an incident angle of 65°. Specific examples of the minimum reflectivity include 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, and 25%.

[0059] In one possible embodiment, the minimum reflectivity may be greater than 13%. In another possible embodiment, the minimum reflectivity may be greater than or equal to 15%.

[0060] Optionally, in order to ensure that the laminated glass 100 meets national standards when used as a windshield, for example, the visible light transmittance of the laminated glass 100 is greater than or equal to 70%, and the laminated glass 100 has a maximum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm when incident at an incident angle of 65°, the maximum reflectivity is less than or equal to 25%.

[0061] Measured from the first surface 101 side, the laminated glass 100 has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm incident at at least one incident angle of 55°, 60°, 65°, 70°, 75°, and 80°. The a and b values ​​satisfy: -2≤a≤2, -2≤b≤2. The reflectance color Lab value of the laminated glass 100 for visible light, measured from the first surface 101 side, represents the appearance color of the laminated glass 100 when viewed from outside the vehicle. The a and b values ​​satisfy: -2≤a≤2, -2≤b≤2, indicating that the appearance color of the laminated glass 100 is close to or entirely neutral, giving the laminated glass 100 a good appearance, which is beneficial for vehicle body color design and matching more design schemes.

[0062] Optionally, measured from the first surface 101 side, the a value of the reflected color of the laminated glass 100 for visible light with wavelengths in the range of 380nm-780nm incident at an incident angle of 55° is greater than or equal to -2 and less than or equal to 2, and the b value is greater than or equal to -2 and less than or equal to 2; and / or, measured from the first surface 101 side, the a value of the reflected color of the laminated glass 100 for visible light with wavelengths in the range of 380nm-780nm incident at an incident angle of 60° is greater than or equal to -2 and less than or equal to 2, and the b value is greater than or equal to -2 and less than or equal to 2; and / or, measured from the first surface 101 side, the a value of the reflected color of the laminated glass 100 for visible light with wavelengths in the range of 380nm-780nm incident at an incident angle of 65° is greater than or equal to -2 and less than or equal to 2, and the b value is greater than or equal to -2 and less than or equal to 2. And / or, measured from the first surface 101 side, the a value of the reflected color of the laminated glass 100 for visible light with wavelengths in the range of 380nm-780nm incident at an incident angle of 70° is greater than or equal to -2 and less than or equal to 2, and the b value is greater than or equal to -2 and less than or equal to 2; and / or, measured from the first surface 101 side, the a value of the reflected color of the laminated glass 100 for visible light with wavelengths in the range of 380nm-780nm incident at an incident angle of 75° is greater than or equal to -2 and less than or equal to 2, and the b value is greater than or equal to -2 and less than or equal to 2; and / or, measured from the first surface 101 side, the a value of the reflected color of the laminated glass 100 for visible light with wavelengths in the range of 380nm-780nm incident at an incident angle of 80° is greater than or equal to -2 and less than or equal to 2, and the b value is greater than or equal to -2 and less than or equal to 2.

[0063] Since the projection device 200 is actually a surface light source of a certain area, and considering design factors such as the size of the head-up display image and the position of the driver's eye box, the projected light 21 incident on the fourth surface 202 of the laminated glass 100 is usually not a single incident angle. Preferably, measured from the first surface 101 side, the laminated glass 100 has a reflective color Lab value for visible light with wavelengths in the range of 380nm-780nm that are incident at at least two incident angles of 55°, 60°, 65°, 70°, 75° and 80°. The a value and b value satisfy: -2≤a≤2, -2≤b≤2, thereby achieving that the appearance color of the laminated glass 100 has a neutral color at at least two angles when viewed from 55° to 80°.

[0064] Alternatively, preferably, when measured from one side of the first surface 101, the laminated glass 100 has a reflective color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least three incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the a value and b value satisfy: -2≤a≤2, -2≤b≤2, thereby achieving that the appearance color of the laminated glass 100 has a neutral color at at least three angles when viewed from 55° to 80°.

[0065] Alternatively, preferably, when measured from one side of the first surface 101, the laminated glass 100 has a reflective color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least four incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the a value and b value satisfy: -2≤a≤2, -2≤b≤2, thereby achieving a neutral color in the appearance of the laminated glass 100 when viewed at most angles from 55° to 80°.

[0066] Alternatively, preferably, when measured from one side of the first surface 101, the laminated glass 100 has a reflective color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least five incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2, thereby achieving a neutral color in the appearance of the laminated glass 100 when viewed at most angles from 55° to 80°.

[0067] Furthermore, measured from the first surface 101 side, the laminated glass 100 has a reflective color Lab value for visible light with wavelengths in the range of 380nm-780nm that are incident at all incident angles of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and b value satisfy: -2≤a≤2, -2≤b≤2, thereby achieving a neutral color in the appearance of the laminated glass 100 when viewed at all angles from 55° to 80°.

[0068] The projection device 200 is used to generate projection light 21. The projection light 21 contains at least 80% P-polarized light. The projection light 21 is incident on the fourth surface 202 of the laminated glass 100 at an incident angle θ of 55° to 80°.

[0069] The laminated glass 100 and head-up display system 1000 provided in this application have a reflective coating 40 on the second surface 102 of the outer glass plate 10 or the third surface 201 of the inner glass plate 20. This coating, when measured from the fourth surface 202 side, results in the laminated glass 100 having a minimum reflectivity greater than 13% for P-polarized light with wavelengths in the 450nm-650nm range incident at a 65° incident angle. This ensures that the laminated glass 100 has a high reflectivity for the main projection light used to achieve the head-up display function. The reflectivity ensures a good head-up display effect. Measured from the first surface 101 side, the laminated glass 100 has a reflective color Lab value for visible light with wavelengths in the 380nm-780nm range incident at at least one incident angle of 55°, 60°, 65°, 70°, 75°, and 80°. The a and b values ​​satisfy: -2≤a≤2, -2≤b≤2, making the outer surface of the laminated glass 100 reflect a neutral color, thus ensuring a good neutral color appearance.

[0070] In one possible embodiment, measured from the fourth surface 202 side, the laminated glass 100 has a maximum reflectivity for P-polarized light with wavelengths in the 450nm-650nm range incident at a 65° incident angle, and the difference between the maximum reflectivity and the minimum reflectivity is less than or equal to 4%. In other words, the range of reflectivity of the laminated glass 100 for P-polarized light with wavelengths in the 450nm-650nm range incident at a 65° incident angle is less than or equal to 4%.

[0071] Optionally, the difference between the maximum reflectivity and the minimum reflectivity is less than or equal to 3%, or the difference between the maximum reflectivity and the minimum reflectivity is less than or equal to 2%, or the difference between the maximum reflectivity and the minimum reflectivity is less than or equal to 1%.

[0072] By ensuring that the difference between the maximum and minimum reflectance of the laminated glass 100 for P-polarized light with a wavelength in the range of 450nm-650nm, measured from the fourth surface 202 side, is less than or equal to 4%, the smoothness of the spectrum reflected by the laminated glass 100 for P-polarized light can be effectively improved. This further enables the projection image to be displayed on the laminated glass 100 as color-neutral as possible, without significant local minima and maxima, thus further improving the neutrality and comfort of the head-up display image formed by the reflection of the laminated glass 100.

[0073] In one possible embodiment, -1 ≤ a ≤ 1, and / or -1 ≤ b ≤ 1. By making -1 ≤ a ≤ 1, and / or -1 ≤ b ≤ 1, the appearance color of the laminated glass 100 can be closer to a neutral color.

[0074] In one possible embodiment, referring to Figures 4 and 5, the reflective coating 40 includes a conductive reflective layer 401 and a color adjustment layer 402. Specifically, the reflective coating 40 includes only one conductive reflective layer 401. The color adjustment layer 402 is closer to the adhesive layer 30 than the conductive reflective layer 401. It is understood that when the reflective coating 40 is disposed on the second surface 102, the conductive reflective layer 401 is closer to the second surface 102 than the color adjustment layer 402, and the color adjustment layer 402 is disposed on the side of the conductive reflective layer 401 facing away from the second surface 102. When the reflective coating 40 is disposed on the third surface 201, the conductive reflective layer 401 is closer to the third surface 201 than the color adjustment layer 402, and the color adjustment layer 402 is disposed on the side of the conductive reflective layer 401 facing away from the third surface 201. In other words, when the reflective coating 40 is disposed on the second surface 102, the outer glass plate 10, the conductive reflective layer 401, the color adjustment layer 402, the adhesive layer 30, and the inner glass plate 20 are stacked sequentially. When the reflective coating 40 is disposed on the third surface 201, the outer glass plate 10, the adhesive layer 30, the color adjustment layer 402, the conductive reflective layer 401, and the inner glass plate 20 are stacked sequentially. The color adjustment layer 402 can adjust the reflected color of the outer surface of the laminated glass 100, thereby achieving, when measured from the first surface 101 side, a reflective color Lab value of the laminated glass 100 for visible light with wavelengths in the range of 380nm-780nm incident at at least one incident angle of 55°, 60°, 65°, 70°, 75°, and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2.

[0075] The conductive reflective layer 401 is made of silver or a silver alloy. The silver alloy is an alloy of silver with at least one of gold, aluminum, copper, indium, nickel, chromium, tin, titanium, and platinum. When the conductive reflective layer 401 is made of a silver alloy, the silver content in the conductive reflective layer 401 can be greater than or equal to 95%. The thickness of the conductive reflective layer 401 can be between 8nm and 20nm, specifically examples being 8nm, 9nm, 10nm, 11nm, 12nm, 13nm, 14nm, 15nm, 16nm, 17nm, 18nm, 19nm, or 20nm, preferably 10nm-16nm.

[0076] The color adjustment layer 402 includes at least one high refractive index layer 420 and at least one low refractive index layer 421 stacked together. The refractive index of the high refractive index layer 420 is greater than the refractive index of the low refractive index layer 421.

[0077] This application does not specify the number of high refractive index layers 420 and low refractive index layers 421 in the color adjustment layer 402. In one possible embodiment, the high refractive index layers 420 and the low refractive index layers 421 are alternately arranged. The refractive index of the high refractive index layer 420 is greater than or equal to 1.8, and the refractive index of the low refractive index layer 421 is less than 1.8. It is understood that the color adjustment layer 402 is a stacked structure containing at least one "high refractive index layer 420 / low refractive index layer 421", wherein the high refractive index layer 420 in each stacked structure is closer to the conductive reflective layer 401 than the low refractive index layer 421 therein.

[0078] Optionally, the color adjustment layer 402 may include one, two, three, or four stacked structures, etc. Specifically, in an embodiment where the color adjustment layer 402 includes one stacked structure, the color adjustment layer 402 includes a first high refractive index layer 420 and a first low refractive index layer 421 stacked together. In an embodiment where the color adjustment layer 402 includes two stacked structures, the color adjustment layer 402 includes a first high refractive index layer 420, a first low refractive index layer 421, a second high refractive index layer 420, and a second low refractive index layer 421 stacked sequentially. In an embodiment where the color adjustment layer 402 includes three stacked structures, the color adjustment layer 402 includes a first high refractive index layer 420, a first low refractive index layer 421, a second high refractive index layer 420, a second low refractive index layer 421, a third high refractive index layer 420, and a third low refractive index layer 421 stacked sequentially. In an embodiment where the color adjustment layer 402 includes four stacked structures, the color adjustment layer 402 includes a first high refractive index layer 420, a first low refractive index layer 421, a second high refractive index layer 420, a second low refractive index layer 421, a third high refractive index layer 420, a third low refractive index layer 421, a fourth high refractive index layer 420, and a fourth low refractive index layer 421, which are stacked sequentially.

[0079] The thickness of the high refractive index layer 420 and the thickness of the low refractive index layer 421 can be the same or different. In embodiments where the color adjustment layer 402 includes multiple stacked structures, the thicknesses of the multiple high refractive index layers 420 can be the same or different, and the thicknesses of the multiple low refractive index layers 421 can be the same or different.

[0080] In one possible embodiment, the physical thickness of any of the high refractive index layers 420 is 5 nm to 80 nm, and the physical thickness of any of the low refractive index layers 421 is 20 nm to 80 nm.

[0081] Optionally, the difference between the total physical thickness of all high refractive index layers 420 and the total physical thickness of all low refractive index layers 421 in the color adjustment layer 402 is less than or equal to 30 nm.

[0082] In one possible embodiment, the total physical thickness of all high refractive index layers 420 in the color adjustment layer 402 is greater than the total physical thickness of all low refractive index layers 421. Of course, in other possible embodiments, the total physical thickness of all high refractive index layers 420 in the color adjustment layer 402 may also be less than the total physical thickness of all low refractive index layers 421.

[0083] Taking an embodiment where the color adjustment layer 402 includes two or more stacked structures as an example, the physical thickness of the first high refractive index layer 420 can be 35nm-75nm, the physical thickness of the first low refractive index layer 421 can be 30nm-70nm, the physical thickness of the second high refractive index layer 420 can be 5nm-30nm, and the physical thickness of the second low refractive index layer 421 can be 25nm-60nm.

[0084] In embodiments where the color adjustment layer 402 includes multiple stacked structures, the refractive indices of the multiple high refractive index layers 420 may be the same or different, and the refractive indices of the multiple low refractive index layers 421 may be the same or different.

[0085] In one possible embodiment, to better achieve the comprehensive requirements of the reflective coating 40 in terms of optical performance, mechanical performance, and appearance color, the high refractive index layer 420 can be a single-layer structure or a multi-layer structure. For example, at least one high refractive index layer 420 may include 2 to 5 high refractive index sublayers, and the refractive index difference between two adjacent high refractive index sublayers may be greater than or equal to 0.1, or even greater than or equal to 0.3. Specifically, the high refractive index layer 420 closest to the conductive reflective layer 401 in the color adjustment layer 402 includes 2 to 5 high refractive index sublayers. Similarly, to better achieve the comprehensive requirements of the reflective coating 40 in terms of optical performance, mechanical performance, and appearance color, the low refractive index layer 421 can be a single-layer structure or a multi-layer structure. For example, each low refractive index layer 421 may include at least two low refractive index sublayers, and the refractive index difference between two adjacent low refractive index sublayers may be greater than or equal to 0.1.

[0086] The high refractive index layer 420 is made of an oxide, nitride, or oxynitride of at least one element or alloy selected from titanium, zirconium, niobium, silicon, antimony, tin, zinc, indium, aluminum, nickel, chromium, magnesium, manganese, vanadium, tungsten, hafnium, tantalum, molybdenum, gallium, yttrium, bismuth, and rare earth elements. For example, the high refractive index layer 420 can be made of zinc tin oxide (ZnSnO). X ), or titanium dioxide (TiO2) X ), or niobium oxide (NbO) X ), or silicon nitride (SiN) X ), or silicon aluminum nitride (SiAlN) X ), or silicon zirconium nitride (SiZrN)X ), X The value can be determined based on the deposition method, such as stoichiometry, substoichiometry, or superstoichiometry, in the magnetron sputtering process.

[0087] The low refractive index layer 421 is made of at least one of the following materials: oxides or alloy oxides of silicon, aluminum, magnesium, or zirconium; oxides of nitrogen; carbides; or fluorides. For example, the low refractive index layer 421 may be made of silicon oxide (SiO2). X ), or silicon aluminum oxide (SiAlO) X ), or silicon zirconium oxide (SiZrO) X ), or aluminum oxide (AlO X ), or magnesium oxide (MgO) X ), or magnesium fluoride (MgF) X ), X The value is determined based on whether the magnetron sputtering process uses stoichiometry, substoichiometry, or superstoichiometry for deposition.

[0088] This embodiment, by comprising at least one high-refractive-index layer 420 and at least one low-refractive-index layer 421 stacked together in the color adjustment layer 402, where the refractive index of the high-refractive-index layer 420 is greater than that of the low-refractive-index layer 421, can effectively adjust the reflected color of the laminated glass 100 to visible light, thereby improving the neutral color effect of the laminated glass 100. By ensuring that the refractive index of the high-refractive-index layer 420 is greater than or equal to 1.8, and the refractive index of the low-refractive-index layer 421 is less than 1.8, i.e., matching the high-refractive-index layer 420 and the low-refractive-index layer 421, it is beneficial to achieve the requirements of reflectivity, reflectance range, and reflected color of visible light for the reflective coating 40. The refractive index in this application is measured based on light at a wavelength of 550 nm.

[0089] Further, referring to Figure 6, the reflective coating 40 further includes at least one dielectric layer 403. The dielectric layer 403 is directly disposed on the second surface 102 or the third surface 201. It is understood that when the reflective coating 40 is disposed on the second surface 102, the dielectric layer 403 is disposed between the second surface 102 and the conductive reflective layer 401. When the reflective coating 40 is disposed on the third surface 201, the dielectric layer 403 is disposed between the third surface 201 and the conductive reflective layer 401. The physical thickness of the dielectric layer 403 is 20 nm to 80 nm. The refractive index of the dielectric layer 403 is greater than or equal to 1.9.

[0090] Referring to Figures 2, 3, and 6, the reflective coating 40 further includes at least one dielectric layer 403. When the reflective coating 40 is disposed on the second surface 102, the dielectric layer 403 is disposed between the outer glass plate 10 and the conductive reflective layer 401. That is, in this embodiment, the outer glass plate 10, the dielectric layer 403, the conductive reflective layer 401, the color adjustment layer 402, the adhesive layer 30, and the inner glass plate 20 are stacked sequentially. When the reflective coating 40 is disposed on the third surface 201, the dielectric layer 403 is disposed between the inner glass plate 20 and the conductive reflective layer 401. That is, in this embodiment, the outer glass plate 10, the adhesive layer 30, the color adjustment layer 402, the conductive reflective layer 401, the dielectric layer 403, and the inner glass plate 20 are stacked sequentially.

[0091] The dielectric layer 403 comprises 2 to 5 dielectric sublayers. The material of any one of the dielectric sublayers is selected from at least one oxide, nitride, or oxynitride selected from zinc, titanium, silicon, aluminum, tin, zirconium, nickel, indium, chromium, tungsten, gallium, yttrium, niobium, copper, samarium, antimony, magnesium, manganese, vanadium, hafnium, tantalum, molybdenum, and bismuth. For example, the material of the dielectric sublayer can be zinc tin oxide (ZnSnO). X ), or titanium dioxide (TiO2) X ), or niobium oxide (NbO) X ), X The value can be determined based on the stoichiometric, substoichiometric, or superstoichiometric deposition methods used in the magnetron sputtering process. The refractive index of the dielectric layer 403 can be greater than or equal to 2.0. The physical thickness of the dielectric layer 403 can be between 30 nm and 60 nm. The dielectric layer 403 can be directly deposited on the second surface 102 of the outer glass plate 10 or on the third surface 201 of the inner glass plate 20.

[0092] This application does not specify the number of dielectric layers 403. To better achieve the comprehensive requirements of the reflective coating 40 in terms of optical performance, mechanical performance, and appearance color, the dielectric layer 403 can be a single-layer structure or a multi-layer structure. For example, the dielectric layer 403 may include 2-5 dielectric sublayers, and the difference in refractive index between two adjacent dielectric sublayers can be greater than or equal to 0.1, and further greater than or equal to 0.3. Preferably, the dielectric layer 403 may include 3 dielectric sublayers, namely, a first lower dielectric sublayer, a first middle dielectric sublayer, and a first upper dielectric sublayer are deposited sequentially from the second surface 102 of the outer glass plate 10 outwards. The first lower dielectric sublayer is directly deposited on the second surface 102 of the outer glass plate 10. The first middle dielectric sublayer is deposited on the surface of the first lower dielectric sublayer facing away from the outer glass plate 10, and the refractive index of the first middle dielectric sublayer is greater than that of the first lower dielectric sublayer. The first upper dielectric sublayer is deposited on the surface of the first middle dielectric sublayer facing away from the first lower dielectric sublayer, and the refractive index of the first upper dielectric sublayer is less than that of the first lower dielectric sublayer. The refractive index of the intermediate dielectric sublayer; or, from the third surface 201 of the inner glass plate 20 outwards, a first lower dielectric sublayer, a first intermediate dielectric sublayer, and a first upper dielectric sublayer are deposited sequentially. The first lower dielectric sublayer is directly deposited on the third surface 201 of the inner glass plate 20. The first intermediate dielectric sublayer is deposited on the surface of the first lower dielectric sublayer away from the inner glass plate 20. The refractive index of the first intermediate dielectric sublayer is greater than that of the first lower dielectric sublayer. The first upper dielectric sublayer is deposited on the surface of the first intermediate dielectric sublayer away from the first lower dielectric sublayer, and the refractive index of the first upper dielectric sublayer is less than that of the first intermediate dielectric sublayer.

[0093] By including at least one dielectric layer 403 in the reflective coating 40, the conductive reflective layer 401 can be protected, preventing the material of the glass plate from migrating to the conductive reflective layer 401 during processes such as lamination. At the same time, the dielectric layer 403 can also increase the adhesion between the glass plate and the conductive reflective layer 401, improve the mechanical properties of the reflective coating 40, and adjust the optical properties of the reflective coating 40.

[0094] Further, referring to Figures 7 to 9, the reflective coating 40 further includes a barrier layer 404 and / or a protective layer 406. The barrier layer 404 is disposed between the conductive reflective layer 401 and the color adjustment layer 402. The protective layer 406 is disposed on the side of the color adjustment layer 402 facing away from the conductive reflective layer 401. The barrier layer 404 is in direct contact with the conductive reflective layer 401. The physical thickness of the barrier layer 404 is 0.5 nm to 5 nm, specifically examples include 0.5 nm, 1 nm, 2 nm, 3 nm, 4 nm, or 5 nm. The protective layer 406 is the layer in the reflective coating 40 closest to the adhesive layer 30. The physical thickness of the protective layer 406 is 7 nm to 25 nm, specifically examples include 7 nm, 8 nm, 10 nm, 12 nm, 15 nm, 16 nm, 18 nm, 20 nm, 22 nm, and 25 nm.

[0095] Referring to Figures 2, 3, and 7, the reflective coating 40 also includes a barrier layer 404. When the reflective coating 40 is disposed on the second surface 102, the outer glass plate 10, the conductive reflective layer 401, the barrier layer 404, the color adjustment layer 402, the adhesive layer 30, and the inner glass plate 20 are stacked sequentially. When the reflective coating 40 is disposed on the third surface 201, the outer glass plate 10, the adhesive layer 30, the color adjustment layer 402, the barrier layer 404, the conductive reflective layer 401, and the inner glass plate 20 are stacked sequentially.

[0096] Referring to Figures 2, 3, and 8, the reflective coating 40 further includes a dielectric layer 403 and a barrier layer 404. When the reflective coating 40 is disposed on the second surface 102, the outer glass plate 10, dielectric layer 403, conductive reflective layer 401, barrier layer 404, color adjustment layer 402, adhesive layer 30, and inner glass plate 20 are stacked sequentially. When the reflective coating 40 is disposed on the third surface 201, the outer glass plate 10, adhesive layer 30, color adjustment layer 402, barrier layer 404, conductive reflective layer 401, dielectric layer 403, and inner glass plate 20 are stacked sequentially.

[0097] Referring to Figures 2, 3, and 9, the reflective coating 40 further includes a barrier layer 404 and a protective layer 406. When the reflective coating 40 is disposed on the second surface 102, the outer glass plate 10, the dielectric layer 403, the conductive reflective layer 401, the barrier layer 404, the color adjustment layer 402, the protective layer 406, the adhesive layer 30, and the inner glass plate 20 are stacked sequentially. When the reflective coating 40 is disposed on the third surface 201, the outer glass plate 10, the adhesive layer 30, the protective layer 406, the color adjustment layer 402, the barrier layer 404, the conductive reflective layer 401, the dielectric layer 403, and the inner glass plate 20 are stacked sequentially.

[0098] The material of the barrier layer 404 is selected from at least one element or alloy of titanium, copper, zirconium, niobium, silicon, antimony, tin, zinc, indium, aluminum, nickel, chromium, magnesium, and manganese.

[0099] The material of the protective layer 406 is selected from at least one nitride or oxide of zinc, titanium, silicon, aluminum, tin, zirconium, nickel, indium, chromium, tungsten, gallium, yttrium, niobium, copper, samarium, antimony, magnesium, manganese, vanadium, hafnium, tantalum, molybdenum, and bismuth. For example, the material of the protective layer 406 can be silicon nitride (SiN). X ), or silicon aluminum nitride (SiAlN) X ), or silicon zirconium nitride (SiZrN) X ), X The value can be determined based on whether the magnetron sputtering process uses stoichiometry, substoichiometry, or superstoichiometry for deposition.

[0100] By providing a barrier layer 404, the conductive reflective layer 401 can be protected from oxidation or damage by oxygen or other substances during the magnetron sputtering process. By providing a protective layer 406, overall protection can be formed, thereby improving the overall chemical properties and corrosion resistance of the reflective coating 40, as well as adjusting the optical properties of the reflective coating 40.

[0101] The laminated glass 100 has a total solar transmittance of less than or equal to 62%. The laminated glass 100 has a visible light transmittance of greater than 70%. The reflective coating 40 has a total thickness of less than or equal to 230 nm, and a single layer thickness of less than or equal to 80 nm.

[0102] The sheet resistance of the reflective coating 40 is less than 5Ω / □, making it suitable for electric heating. This enables rapid dehumidification, defrosting, defogging, and even de-icing. Therefore, the laminated glass 100 provided in this application can also have an electric heating function, suitable for power supplies from 36V to 60V. Specifically, the laminated glass 100 also includes a first busbar and a second busbar electrically connected to the reflective coating 40. The first busbar and the second busbar can be electrically connected to the two electrodes of the power supply, respectively, thereby introducing current into the reflective coating 40, so that the reflective coating 40 has a current of at least 500W / m between the first busbar and the second busbar. 2 The heating power density. The first busbar and the second busbar can be selected from one or more of silver paste, copper foil, and aluminum foil.

[0103] In one possible embodiment, the total solar transmittance of the laminated glass 100 may be less than or equal to 61%, or less than or equal to 60%, or less than or equal to 58%. The visible light transmittance of the laminated glass 100 may be greater than or equal to 71%; or greater than or equal to 72%, or greater than or equal to 75%.

[0104] By ensuring that the total solar transmittance of the laminated glass 100 is less than or equal to 62%, the total solar transmittance can be effectively reduced, thereby improving the heat insulation effect of the laminated glass 100. This, in turn, effectively improves the heat insulation effect of the head-up display system using the laminated glass 100, better meeting commercial needs and enhancing the user experience. By ensuring that the visible light transmittance of the laminated glass is greater than 70%, the light transmittance of the laminated glass 100 can be guaranteed, meeting the regulatory requirements for windshields.

[0105] Optionally, the thickness of the conductive reflective layer 401 can be 8nm, 10nm, 11nm, 14nm, 15nm, 16nm, 18nm, or 20nm. By keeping the thickness of the conductive reflective layer 401 within the range of 8nm-20nm, it is possible to avoid the conductive reflective layer 401 being too thick or too thin. If the thickness of the conductive reflective layer 401 is less than 8nm, the sheet resistance of the reflective coating 40 increases, which is not conducive to realizing the heating function of the reflective coating 40, and the reflectivity of P-polarized light is too low, which is not conducive to ensuring that the reflectivity of P-polarized light is greater than or equal to 13%. At the same time, the total solar transmittance of the laminated glass 100 increases, which is not conducive to improving the heat insulation performance. If the thickness of the conductive reflective layer 401 is greater than 20nm, the visible light transmittance of the laminated glass 100 decreases, which is not conducive to ensuring that the visible light transmittance of the laminated glass 100 is greater than 70%, failing to meet the requirements of windshield regulations, and making it difficult to achieve a neutral color reflected from the outer surface of the laminated glass 100, affecting the appearance of the laminated glass 100.

[0106] Optionally, the total thickness of the reflective coating 40 is less than or equal to 220 nm, or less than or equal to 210 nm, or less than or equal to 200 nm. More preferably, the total thickness of the reflective coating 40 is greater than or equal to 100 nm, or greater than or equal to 120 nm, or greater than or equal to 150 nm.

[0107] Optionally, the thickness of a single layer of the reflective coating 40 is less than or equal to 70 nm, that is, the maximum thickness of any one film layer or sublayer in the reflective coating 40 is less than or equal to 70 nm.

[0108] By making the total thickness of the reflective coating 40 less than or equal to 230 nm and the thickness of a single layer less than or equal to 80 nm, the excessive thickness of the reflective coating 40 can be avoided, which is beneficial for the production of the reflective coating 40 through magnetron sputtering process and reduces production costs.

[0109] Optionally, the sheet resistance of the reflective coating 40 is less than or equal to 4 Ω / □, or the sheet resistance of the reflective coating 40 is less than or equal to 3 Ω / □. In one possible embodiment, the sheet resistance of the reflective coating 40 may be greater than or equal to 2 Ω / □ and less than or equal to 4 Ω / □.

[0110] Comparative Examples 1-3 and Examples 1-5

[0111] A laminated glass 100 is prepared. Both the outer glass plate 10 and the inner glass plate 20 of the laminated glass 100 are made of transparent glass (i.e., standard clear glass) with a thickness of 2.1 mm. The adhesive layer 30 is made of PVB with a thickness of 0.76 mm. The reflective coating 40 is disposed on the third surface 201 of the inner glass plate 20. The film structure, film material and film thickness of Comparative Examples 1-3 and Example 1 are shown in Table 1.

[0112] Table 1: Film structure, film material, and film thickness of the reflective coatings of Comparative Examples 1-3 and Example 1

[0113] The membrane structure, membrane material, and membrane thickness of Examples 2-5 are shown in Table 2.

[0114] Table 2: Film structure, film material, and film thickness of the reflective coatings in Examples 2-5

[0115] In Tables 1 and 2, the dielectric layer 403 is directly disposed on the third surface 201 of the inner glass plate 20. The film material of the dielectric layer 403 includes at least two of ZnSnO3, TiO2, and AZO. The film material of the conductive reflective layer 401 is Ag. The film material of the barrier layer 404 is NiCr. The film material of the first high refractive index layer of the color adjustment layer 402 includes at least two of AZO, Si3N4, ZnSnO3, and TiO2; the film material of the second high refractive index layer of the color adjustment layer 402 is TiO2; and the film materials of the first low refractive index layer and the second low refractive index layer of the color adjustment layer 402 are SiO2. The film material of the protective layer 406 is Si3N4. The test results of Comparative Examples 1-3 and Example 1 in Table 1 are shown in Table 3.

[0116] Table 3: Test results of Comparative Examples 1-3 and Example 1

[0117] The test results of Examples 2-5 in Table 2 are shown in Table 4.

[0118] Table 4: Test Results of Examples 2-5

[0119] In Tables 3 and 4: Visible light transmittance TL (%): The transmittance of the laminated glass 100 for vertically incident visible light, calculated according to standard ISO 9050. Total solar transmittance TTS (%): Calculated according to standard ISO 9050. Maximum reflectance Rpmax (%): Measured from the fourth surface side, the laminated glass has the maximum reflectance for P-polarized light with wavelengths in the range of 450 nm to 650 nm when incident at a 65° angle; for example, if P-polarized light with wavelengths in the range of 450 nm to 650 nm has a maximum value at a wavelength of 600 nm when incident at a 65° angle, then the reflectance of P-polarized light with a wavelength of 600 nm incident at a 65° angle is the maximum reflectance. Minimum reflectivity Rpmin (%): Measured from the fourth surface side, the laminated glass has minimum reflectivity for P-polarized light with wavelengths in the range of 450nm-650nm incident at a 65° incident angle; for example, if P-polarized light with wavelengths in the range of 450nm-650nm has a minimum at a wavelength of 500nm when incident at a 65° incident angle, then the reflectivity of P-polarized light with wavelengths of 600nm incident at a 65° incident angle is the minimum reflectivity.

[0120] The reflected color Lab measured from one side of the first surface: the a value represents the red-green value of the visible light reflected color at incident angles of 55°, 60°, 65°, 70°, 75°, and 80°, calculated based on the CIE1976 Lab color space and the D65 light source; the b value represents the yellow-blue value of the visible light reflected color at incident angles of 55°, 60°, 65°, 70°, 75°, and 80°, calculated based on the CIE1976 Lab color space and the D65 light source.

[0121] As shown in Figure 10, Figure 10 contains the reflectance spectrum curves of Examples 1-5. Combining Tables 3 and 4 with Figure 10, it can be seen that, compared to Comparative Examples 1-3, the laminated glass 100 of Examples 1-5 provided in this application satisfies the following:

[0122] 1. The sheet resistance of the reflective coating 40 is 2Ω / □~4Ω / □.

[0123] 2. The visible light transmittance of laminated glass 100 is greater than or equal to 70%, and the total solar energy transmittance is less than or equal to 62%, or even less than or equal to 60%, or even less than or equal to 58%.

[0124] 3. Laminated glass 100 has a minimum reflectivity Rpmin for P-polarized light with wavelengths of 450nm-650nm incident at an incident angle of 65°, Rpmin ≥ 13% or Rpmin ≥ 15%.

[0125] 4. Laminated glass 100 has a reflection range range for P-polarized light with wavelengths of 450nm-650nm incident at an incident angle of 65°. The reflection range range is ≤3.5%, or range≤2.5%, or range≤2%, or range≤1.5%, or range≤1%. Reflection range range = Rpmax - Rpmin.

[0126] 5. The a-value of the reflected color of the laminated glass 100 to visible light incident at incident angles of 55°, 60°, 65°, 70°, 75°, and 80° is measured from one side of the first surface 101. The a-value is -2 to 2 and the b-value is -2 to 2, or the a-value is -1 to 1 and the b-value is -2 to 2, or the a-value is -2 to 2 and the b-value is -1 to 1, or even the a-value is -1 to 1 and the b-value is -1 to 1. That is, the reflected color of the outer surface of the laminated glass 100 is close to neutral color or is neutral color when observed at 55°, or 55°-60°, or 55°-65°, or 55°-70°, or 55°-75°, or 55°-80°.

[0127] Comparative Examples 4-6 and Examples 6-10

[0128] Another type of laminated glass 100 is prepared. The outer glass plate 10 and the inner glass plate 20 of the laminated glass 100 are both made of transparent glass with a thickness of 2.1 mm. The adhesive layer 30 is made of wedge-shaped PVB with a thickness of 0.76 mm. The reflective coating 40 is provided on the second surface 102 of the outer glass plate 10. The film structure, film material and film thickness of Comparative Examples 4-6 and Example 6 are shown in Table 4.

[0129] Table 5: Film structure, film material, and film thickness of the reflective coatings of Comparative Examples 4-6 and Example 6

[0130] The membrane structure, membrane material, and membrane thickness of Examples 7-10 are shown in Table 6.

[0131] Table 6: Film structure, film material, and film thickness of the reflective coatings in Examples 7-10

[0132] In Tables 4 and 5, the dielectric layer 403 is directly disposed on the second surface 102 of the outer glass plate 10. The film material of the dielectric layer 403 includes at least two of ZnSnO3, TiO2, and AZO. The film material of the conductive reflective layer 401 is Ag. The film material of the barrier layer 404 is NiCr. The film material of the first high refractive index layer of the color adjustment layer 402 includes at least two of AZO, Si3N4, ZnSnO3, and TiO2; the film material of the second high refractive index layer of the color adjustment layer 402 is TiO2; and the film materials of the first low refractive index layer and the second low refractive index layer of the color adjustment layer 402 are SiO2. The film material of the protective layer 406 is Si3N4. The test results of Comparative Examples 4-6 and Example 6 in Table 5 are shown in Table 7.

[0133] Table 7: Test results of Comparative Examples 4-6 and Example 6

[0134] The test results of Examples 7-10 in Table 6 are shown in Table 8.

[0135] Table 8: Test Results of Examples 7-10

[0136] In Tables 7 and 8: the methods for measuring visible light transmittance TL (%), total solar transmittance TTS (%), maximum reflectance Rpmax (%), minimum reflectance Rpmin (%), and reflectance color Lab measured from the first surface side are the same as those in Tables 3 and 4.

[0137] As shown in Figure 11, Figure 11 contains the reflectance spectrum curves of Embodiments 6-10 provided in this application. Referring to Tables 7 and 8 and Figure 11, it can be seen that, compared with Comparative Examples 4-6, the laminated glass 100 of Embodiments 6-10 provided in this application satisfies the following:

[0138] 1. The sheet resistance of the reflective coating 40 is 2Ω / □~4Ω / □.

[0139] 2. The visible light transmittance of laminated glass 100 is greater than or equal to 70%, and the total solar energy transmittance is less than or equal to 60%, or even less than or equal to 58%.

[0140] 3. Laminated glass 100 has a minimum reflectivity Rpmin for P-polarized light with wavelengths of 450nm-650nm incident at an incident angle of 65°, Rpmin ≥ 13% or Rpmin ≥ 15%.

[0141] 4. Laminated glass 100 has a reflection range range for P-polarized light with wavelengths of 450nm-650nm incident at an incident angle of 65°. The reflection range range is ≤3.5%, or range≤2.5%, or range≤2%, or range≤1.5%, or range≤1%. Reflection range range = Rpmax - Rpmin.

[0142] 5. The a-value of the reflected color of the laminated glass 100 to visible light incident at incident angles of 55°, 60°, 65°, 70°, 75°, and 80° is measured from one side of the first surface 101. The a-value is -2 to 2 and the b-value is -2 to 2. In some cases, the a-value is -1 to 1 and the b-value is -1 to 1. This means that the reflected color of the outer surface of the laminated glass 100 is close to neutral color or neutral color at all angles when observed from 55° to 80°.

[0143] The features mentioned above in the specification, claims, and drawings can be combined in any way as long as they are meaningful within the scope of this application. The advantages and features described for the laminated glass 100 are applied accordingly to the head-up display system 1000.

[0144] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. A laminated glass, characterized in that, include: The outer glass panel includes a first surface and a second surface disposed opposite to each other; The inner glass panel includes a third surface and a fourth surface disposed opposite to each other; An adhesive layer is disposed between the second surface and the third surface, and connects the outer glass plate and the inner glass plate; and A reflective coating is provided on the second surface or the third surface for reflecting P-polarized light; Measured from one side of the fourth surface, the laminated glass has a minimum reflectivity of 13% or greater for P-polarized light with wavelengths in the range of 450 nm to 650 nm incident at an incident angle of 65°. Measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least one incident angle of 55°, 60°, 65°, 70°, 75° and 80°, and the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2.

2. The laminated glass according to claim 1, characterized in that, Measured from the fourth surface side, the laminated glass has a maximum reflectivity for P-polarized light with wavelengths in the range of 450nm-650nm incident at an incident angle of 65°, and the difference between the maximum reflectivity and the minimum reflectivity is less than or equal to 4%.

3. The laminated glass according to claim 1, characterized in that, -1≤a≤1, and / or -1≤b≤1.

4. The laminated glass according to claim 1, characterized in that, Measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least two incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2; Alternatively, measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least three incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2; Alternatively, measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm when incident at at least four incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2; Alternatively, measured from the first surface side, the laminated glass has a reflectance color Lab value for visible light with wavelengths in the range of 380nm-780nm that is incident at at least five incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2; Alternatively, measured from the first surface side, the laminated glass has a reflective color Lab value for visible light in the wavelength range of 380nm-780nm incident at all incident angles of 55°, 60°, 65°, 70°, 75° and 80°, where the values ​​a and b satisfy: -2≤a≤2, -2≤b≤2.

5. The laminated glass according to any one of claims 1 to 4, characterized in that, The reflective coating includes a conductive reflective layer and a color adjustment layer. The material of the conductive reflective layer is silver metal or a silver alloy. The silver alloy is an alloy of silver with at least one of gold, aluminum, copper, indium, nickel, chromium, tin, titanium and platinum. The color adjustment layer is closer to the adhesive layer than the conductive reflective layer. The color adjustment layer includes at least one high refractive index layer and at least one low refractive index layer stacked together. The high refractive index layer and the low refractive index layer are alternately arranged. The refractive index of the high refractive index layer is greater than or equal to 1.8, and the refractive index of the low refractive index layer is less than 1.

8.

6. The laminated glass according to claim 5, characterized in that, The reflective coating further includes a dielectric layer, which is directly disposed on the second surface or the third surface. The conductive reflective layer is directly disposed on the dielectric layer. The physical thickness of the dielectric layer is 20 nm to 80 nm, and the refractive index of the dielectric layer is greater than or equal to 1.

9.

7. The laminated glass according to claim 6, characterized in that, The dielectric layer comprises 2 to 5 dielectric sublayers, and the material of any one dielectric sublayer is selected from at least one oxide, nitride, or oxynitride of zinc, titanium, silicon, aluminum, tin, zirconium, nickel, indium, chromium, tungsten, gallium, yttrium, niobium, copper, samarium, antimony, magnesium, manganese, vanadium, hafnium, tantalum, molybdenum, and bismuth.

8. The laminated glass according to claim 5, characterized in that, At least one high refractive index layer comprises 2 to 5 high refractive index sublayers, wherein the difference in refractive index between two adjacent high refractive index sublayers is greater than or equal to 0.

1.

9. The laminated glass according to claim 5, characterized in that, The reflective coating further includes a barrier layer disposed between the conductive reflective layer and the color adjustment layer. The barrier layer is in direct contact with the conductive reflective layer. The material of the barrier layer is selected from at least one element or alloy of titanium, copper, zirconium, niobium, silicon, antimony, tin, zinc, indium, aluminum, nickel, chromium, magnesium, and manganese. The physical thickness of the conductive reflective layer is 8 nm to 20 nm, and the physical thickness of the barrier layer is 0.5 nm to 5 nm.

10. The laminated glass according to claim 5, characterized in that, The physical thickness of any of the high refractive index layers is 5 nm to 80 nm, and the physical thickness of any of the low refractive index layers is 20 nm to 80 nm.

11. The laminated glass according to claim 10, characterized in that, The difference between the total physical thickness of all high-refractive-index layers and the total physical thickness of all low-refractive-index layers in the color adjustment layer is less than or equal to 30 nm.

12. The laminated glass according to claim 10, characterized in that, The total physical thickness of all high-refractive-index layers in the color adjustment layer is greater than the total physical thickness of all low-refractive-index layers.

13. The laminated glass according to claim 5, characterized in that, The reflective coating further includes a protective layer, which is disposed on the side of the color adjustment layer opposite to the conductive reflective layer. The protective layer is the layer closest to the adhesive layer in the reflective coating, and the physical thickness of the protective layer is 7nm to 25nm. The material of the protective layer is selected from at least one nitride or oxide of zinc, titanium, silicon, aluminum, tin, zirconium, nickel, indium, chromium, tungsten, gallium, yttrium, niobium, copper, samarium, antimony, magnesium, manganese, vanadium, hafnium, tantalum, molybdenum, and bismuth.

14. The laminated glass according to claim 1, characterized in that, The total solar transmittance of the laminated glass is less than or equal to 62%, and the visible light transmittance of the laminated glass is greater than 70%.

15. The laminated glass according to claim 1, characterized in that, The total physical thickness of the reflective coating is less than or equal to 230 nm, and the sheet resistance of the reflective coating is less than 5 Ω / □.

16. A head-up display system, characterized in that: The invention includes a projection device and a laminated glass according to any one of claims 1 to 15, the projection device being used to generate projection light rays containing at least 80% P-polarized light rays, the projection light rays being incident on a fourth surface of the laminated glass at an incident angle of 55° to 80°.

Images