Laminated glass and head-up display system

Abstract

The invention provides laminated glass and a head-up display system. The laminated glass comprises an outer glass plate, an inner glass plate, a bonding layer and a reflecting coating. And the reflecting coating is arranged on the second surface or the third surface of the laminated glass and is used for reflecting the P polarized light. And measured from one side of the fourth surface, the laminated glass has the minimum reflectivity for P polarized light which is incident at an incident angle of 65 degrees and has the wavelength in the range of 450-650 nm, and the minimum reflectivity is greater than or equal to 13%. And measured from one side of the first surface, the laminated glass has a reflection color Lab value for visible light which is incident at at least one incidence angle of 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees and 80 degrees and has the wavelength in the range of 380 nm to 780 nm, and a and b values meet the following conditions:-2 < = a < = 2,-2 < = b < = 2. The laminated glass and the head-up display system provided by the invention have good head-up display and appearance neutral color effects.

Description

Technical Field

[0001] The present application relates to the technical field of head-up display, and in particular to a laminated glass and a head-up display system. Background Art

[0002] Head Up Display (HUD) is increasingly used in automotive and other fields, among which laminated glass is one of the key points in HUD design. The design of laminated glass in existing HUD is difficult to take into account both the requirements of head up display and neutral color of appearance. Summary of the invention

[0003] The present application provides a laminated glass and a head-up display system with good head-up display and neutral color effect in appearance.

[0004] In one aspect, the present application provides a laminated glass, comprising:

[0005] An outer glass plate, comprising a first surface and a second surface disposed opposite to each other;

[0006] The inner glass plate comprises a third surface and a fourth surface disposed opposite to each other;

[0007] an adhesive layer, disposed between the second surface and the third surface, and connecting the outer glass plate and the inner glass plate; and

[0008] A reflective coating, provided on the second surface or the third surface, for reflecting P-polarized light;

[0009] The laminated glass has a minimum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65° measured from the fourth surface, and the minimum reflectivity is greater than or equal to 13%;

[0010] Measured from the first surface side, the laminated glass has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least one incident angle of 55°, 60°, 65°, 70°, 75° and 80°, and a value and b value satisfy: -2≤a≤2, -2≤b≤2.

[0011] In a possible embodiment, measured from the fourth surface side, the laminated glass has a maximum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65°, and a difference between the maximum reflectivity and the minimum reflectivity is less than or equal to 4%.

[0012] In a possible embodiment, -1≤a≤1, and / or -1≤b≤1.

[0013] In a possible embodiment, measured from the first surface side, the laminated glass has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least two incident angles of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2;

[0014] Alternatively, the laminated glass has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least three incident angles of 55°, 60°, 65°, 70°, 75° and 80° measured from the first surface side, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2;

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

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

[0017] Alternatively, measured from the first surface side, the laminated glass has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at all incident angles of 55°, 60°, 65°, 70°, 75° and 80°, and a value and b value satisfy: -2≤a≤2, -2≤b≤2.

[0018] In a possible embodiment, the reflective coating includes a conductive reflective layer and a color adjustment layer, the conductive reflective layer is made of silver metal or a silver alloy, and the silver alloy is an alloy of silver and at least one of gold, aluminum, copper, indium, nickel, chromium, tin, titanium and platinum;

[0019] The color adjustment layer is closer to the bonding layer than the conductive reflective layer, and the color adjustment layer includes at least one high refractive index layer and at least one low refractive index layer stacked in layers, the high refractive index layers and the low refractive index layers 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.

[0020] In a 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, and 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.

[0021] In a possible embodiment, the dielectric layer includes 2 to 5 dielectric sublayers, and 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.

[0022] In a possible embodiment, the at least one high refractive index layer includes 2 to 5 high refractive index sub-layers, and the difference in refractive index between two adjacent high refractive index sub-layers is greater than or equal to 0.1.

[0023] In a possible embodiment, the reflective coating further includes a barrier layer, which is disposed between the conductive reflective layer and the color adjustment layer, and is in direct contact with the conductive reflective layer. A material of the barrier layer is selected from at least one of titanium, copper, zirconium, niobium, silicon, antimony, tin, zinc, indium, aluminum, nickel, chromium, magnesium, and manganese, or an alloy thereof. 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.

[0024] In a 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.

[0025] In a 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.

[0026] In a 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.

[0027] In a possible embodiment, the reflective coating further includes a protective layer, which is disposed on a side of the color adjustment layer away from the conductive reflective layer, the protective layer is a layer of the reflective coating closest to the bonding 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 nitride 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.

[0028] In a possible embodiment, the total solar energy 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%.

[0029] In a possible embodiment, the total physical thickness of the reflective coating is less than or equal to 230 nm, and the square resistance of the reflective coating is less than 5Ω / □.

[0030] On the other hand, the present 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% of P-polarized light, and the projection light is incident on the fourth surface of the laminated glass at an incident angle of 55° to 80°.

[0031] The laminated glass and head-up display system provided by the present application are provided with a reflective coating on the second surface of the outer glass plate or the third surface of the inner glass plate, so that when measured from the fourth surface side, the laminated glass has a minimum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65°, and the minimum reflectivity is greater than or equal to 13%, so that the laminated glass has a high reflectivity for the main projection light for realizing the head-up display function, thereby ensuring a good head-up display effect; and when measured from the first surface side, the laminated glass has a reflective color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least one incident angle of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2, so that the color of the reflected light of the laminated glass is neutral, thereby ensuring a good appearance neutral color effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0033] Figure 1 A schematic diagram of the structure of the head-up display system provided in this application;

[0034] Figure 2 A cross-sectional schematic diagram of an embodiment of the laminated glass provided in the present application;

[0035] Figure 3 A cross-sectional schematic diagram of another embodiment of the laminated glass provided in the present application;

[0036] Figure 4 A cross-sectional schematic diagram of an embodiment of the reflective coating provided in the present application;

[0037] Figure 5 A schematic cross-sectional view of another embodiment of the reflective coating provided in the present application;

[0038] Figure 6 for Figure 4 The reflective coating shown also includes a cross-sectional schematic diagram of a dielectric layer;

[0039] Figure 7 for Figure 4 The reflective coating shown also includes a cross-sectional schematic diagram of a barrier layer;

[0040] Figure 8 for Figure 4 The reflective coating shown also includes a cross-sectional schematic diagram of a dielectric layer and a barrier layer;

[0041] Fig. 9 for Figure 8 The reflective coating shown also includes a cross-sectional schematic diagram of a protective layer;

[0042] Fig.10 The reflection spectrum curves of Examples 1-5 of Table 1 and Table 2 provided in this application;

[0043] Fig.11 The reflectance spectrum curves of Examples 6-10 in Tables 3 and 4 provided in this application.

[0044] Description of reference numerals:

[0045] Head-up display system 1000; projection device 200; projection light 21; laminated glass 100; outer glass plate 10; inner glass plate 20; bonding 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 DESCRIPTION

[0046] The technical solution provided by the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0047] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can 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. in the specification and claims of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but may optionally include one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0049] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of the head-up display system 1000 provided in the present 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, and 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 it is incident on the inner surface of the laminated glass 100.

[0050] Please refer to Figure 2 and Figure 3 , Figure 2 is a cross-sectional schematic diagram of an embodiment of the laminated glass 100 provided in the present application, Figure 3 This is a cross-sectional schematic diagram of another embodiment of the laminated glass 100 provided in the present application. The laminated glass 100 comprises an outer glass plate 10, an inner glass plate 20, an adhesive layer 30 and a reflective coating 40. The outer glass plate 10 is located outside the vehicle when the laminated glass 100 is in a vehicle-mounted state, and the inner glass plate 20 is located inside the vehicle when the laminated glass 100 is in a vehicle-mounted state. The adhesive layer 30 is used to connect the outer glass plate 10 and the inner glass plate 20, and the reflective coating 40 is disposed between the outer glass plate 10 and the inner glass plate 20. In the present application, the laminated glass 100 may be a front windshield.

[0051] In one or more embodiments of the present application, unless explicitly stated, the visible light transmittance (TL) represents the transmittance of the laminated glass 100 to vertically incident visible light measured and calculated according to standard ISO9050, the a value represents the red-green value of the visible light reflection color at a specified incident angle measured and 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 reflection color at a specified incident angle measured and calculated based on the CIE1976 Lab color space and the D65 light source, and the total solar energy transmittance (TTS) is obtained by measurement and calculation according to standard ISO9050.

[0052] The outer glass plate 10 includes a first surface 101 and a second surface 102 disposed opposite to each other. The inner glass plate 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 front windshield, the first surface 101 faces the outside of the vehicle and serves as the outer surface of the laminated glass 100, and the fourth surface 202 faces the inside of the vehicle and serves as the inner surface of the laminated glass 100. The outer glass plate 10 is transparent glass or tinted glass, the thickness of the outer glass plate 10 is 0.7 mm to 4.0 mm, and the visible light transmittance of the outer glass plate 10 is greater than or equal to 80%. The inner glass plate 20 is transparent glass or tinted glass, the thickness of the inner glass plate 20 is 0.7 mm to 4.0 mm, and the visible light transmittance of the inner glass plate 20 is greater than or equal to 80%. The total iron content of the transparent glass (in terms of Fe2O3) 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 of the tinted glass (in terms of Fe2O3) 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 transparent glass with a thickness of 2.1 mm and a visible light transmittance of 89%, and the inner glass plate 20 can be a green glass with a thickness of 1.6 mm and a visible light transmittance of 83%, or a green glass with a thickness of 2.1 mm and a visible light transmittance of 80%. The thickness of the outer glass plate 10 can be the same as or different from the thickness of the inner glass plate 20. In the following embodiments, unless otherwise specified, the thickness of the outer glass plate 10 is the same as the thickness of the inner glass plate 20.

[0053] The adhesive layer 30 is disposed between the second surface 102 and the third surface 201, and connects the outer glass plate 10 and the inner glass plate 20. It is understandable 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. The present application does not make any specific limitation on 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). The present application does not make any specific limitation on 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 a 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 thermoplastic polymer film or a 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 ionomer (Sentry Glas Plus, SGP). When the bonding 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 bonding layer 30 can be, but not limited to, 80%, 85%, 90%, or 95%. When the bonding 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 bonding layer 30 can be, but not limited to, 80%, 85%, or 90%. The colored thermoplastic polymer film can be selected from a gray thermoplastic polymer film, a green thermoplastic polymer film, or a blue thermoplastic polymer film. Exemplarily, the bonding layer 30 can be a single-layer structure or a multi-layer structure. The multi-layer structure can be exemplified by a double-layer structure, a three-layer structure, a four-layer structure, a five-layer structure, etc. The bonding layer 30 may also have other functions, such as providing at least one colored area to serve as a shadow band to reduce the interference of sunlight to the human eye, or adding an infrared absorber to provide sun protection or heat insulation functions, or adding an ultraviolet absorber to provide ultraviolet isolation functions, or at least one layer of the multi-layer structure has a higher plasticizer content to provide a sound insulation function.

[0055] The reflective coating 40 is disposed on the second surface 102 or the third surface 201, and is used to reflect the projection light 21 to form a head-up display image. In the present application, the reflective coating 40 is formed by a plurality of film layers stacked in sequence. The reflective coating 40 disposed on the second surface 102 can be disposed in any area of ​​the second surface 102, or the reflective coating 40 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 the reflective coating 40 can cover the entire third surface 201. Figure 2As shown, 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. The laminated glass 100 in this embodiment includes the outer glass plate 10, the reflective coating 40, the bonding layer 30 and the inner glass plate 20 which are sequentially stacked. Figure 3 As shown, in an embodiment in which 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. The laminated glass 100 in this embodiment includes an outer glass plate 10, an adhesive layer 30, a reflective coating 40 and an inner glass plate 20 which are stacked in sequence.

[0056] The wavelength of the projection light 21 may be in the range of 380 nm to 780 nm. The projection light 21 may contain at least 80% of P-polarized light. The higher the proportion of P-polarized light in the projection light 21, the more conducive it is to meeting the use needs of drivers wearing sunglasses and the easier it is to eliminate the visual ghosting phenomenon of the head-up display image. Exemplarily, the projection light 21 contains at least 85% of P-polarized light, or the projection light 21 contains at least 90% of P-polarized light, or the projection light 21 contains at least 95% of P-polarized light, or even the projection light 21 is 100% of P-polarized light, that is, the projection light 21 is basically pure P-polarized light.

[0057] In order to eliminate the image ghosting of the head-up display, the conventional front windshield usually adopts the bonding layer 30 with a wedge angle of at least 0.3 mrad, which makes it difficult to design, produce, and debug the imaging effect of the head-up display system 1000. The laminated glass 100 provided in the present application realizes the head-up display function by using the reflective coating 40 and the projection light with the proportion of P polarized light greater than or equal to 80%, and can adopt a common equal-thickness bonding layer 30 to save costs and reduce the difficulty of design, production, and debugging. The wedge angle of the equal-thickness bonding layer 30 is substantially equal to 0, and the cross-sectional shape is roughly rectangular. It is understandable that the present application may also select a bonding layer 30 with a smaller wedge angle, for example, the wedge angle of the bonding layer 30 is 0.01-0.15 mrad, such as 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., which can further eliminate the perspective ghosting generated by the scenery in the external environment of the vehicle passing through the laminated glass 100. The bonding layer 30 with a smaller wedge angle can be obtained by a simple stretching process, so that the reflective ghosting and the perspective ghosting can be eliminated at the same time in a low-cost manner, and a higher quality head-up display image and observation effect can be obtained.

[0058] The laminated glass 100 has a minimum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65° measured from the fourth surface 202, and the minimum reflectivity is greater than or equal to 13%. The minimum reflectivity can be specifically exemplified by 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, etc.

[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 can meet national standard requirements when used as a front windshield, for example, the visible light transmittance of the laminated glass 100 is greater than or equal to 70%, and measured from the side of the fourth surface 202, the laminated glass 100 has a maximum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65°, and the maximum reflectivity is less than or equal to 25%.

[0061] The laminated glass 100 has a reflected color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least one incident angle of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2. The reflected 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 observed from the outside of the vehicle, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2, which means that the appearance color of the laminated glass 100 is close to a neutral color or is a neutral color, so that the laminated glass 100 has a good appearance, which is conducive to the vehicle body color design and matching of 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 a wavelength 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 a wavelength 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 a wavelength 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 side of the first surface 101, the a value of the reflected color of the laminated glass 100 for visible light with a wavelength 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 side of the first surface 101, the a value of the reflected color of the laminated glass 100 for visible light with a wavelength 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 side of the first surface 101, the a value of the reflected color of the laminated glass 100 for visible light with a wavelength 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, combined with design factors such as the size of the head-up display image and the position of the driver's eye box, the projection light 21 incident on the fourth surface 202 of the laminated glass 100 is usually not a single incident angle. Preferably, measured from the side of the first surface 101, the laminated glass 100 has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least two incident angles of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2, so that the appearance color of the laminated glass 100 has a neutral color at at least two angles when observed at 55°~80°.

[0064] Or preferably, measured from the first surface 101 side, the laminated glass 100 has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least three incident angles of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2, so that the appearance color of the laminated glass 100 has a neutral color at at least three angles when observed at 55°-80°.

[0065] Or preferably, measured from the first surface 101 side, the laminated glass 100 has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least four incident angles of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2, so that the appearance color of the laminated glass 100 has a neutral color at most angles when observed at 55°-80°.

[0066] Or preferably, measured from the first surface 101 side, the laminated glass 100 has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least five incident angles of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2, so that the appearance color of the laminated glass 100 has a neutral color at most angles when observed at 55°-80°.

[0067] Even, measured from the side of the first surface 101, the laminated glass 100 has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at all incident angles of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2, so that the appearance color of the laminated glass 100 has a neutral color at all angles when observed at 55°~80°.

[0068] The projection device 200 is used to generate a projection light 21. The projection light 21 contains at least 80% of 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 the head-up display system 1000 provided by the present application are provided with 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, so that the laminated glass 100 has a minimum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65° when measured from the side of the fourth surface 202, and the minimum reflectivity is greater than 13%, so that the laminated glass 100 has a high reflectivity for the main projection light for realizing the head-up display function. reflectivity, thereby ensuring a good head-up display effect; and measured from the side of the first surface 101, the laminated glass 100 has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least one incident angle of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value satisfy: -2≤a≤2, -2≤b≤2, so that the outer surface reflection color of the laminated glass 100 is neutral, thereby ensuring a good appearance neutral color effect.

[0070] In a possible embodiment, the laminated glass 100 has a maximum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65° measured from the fourth surface 202, and a difference between the maximum reflectivity and the minimum reflectivity is less than or equal to 4%. In other words, the extreme difference in reflectivity of the laminated glass 100 for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65° 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 making the difference between the maximum reflectivity and the minimum reflectivity of the laminated glass 100 for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65°, measured from the side of the fourth surface 202, be 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, thereby further achieving a color-neutral display of the projected image on the laminated glass 100 as much as possible without significant local minima and maxima, that is, further improving the display neutrality and comfort of the head-up display image formed by the reflection of the laminated glass 100.

[0073] In a possible embodiment, -1≤a≤1, and / or, -1≤b≤1. By setting -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, please refer to Figure 4 and Figure 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 bonding layer 30 than the conductive reflective layer 401. It can be understood that when the reflective coating 40 is provided 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 provided on the side of the conductive reflective layer 401 away from the second surface 102. When the reflective coating 40 is provided 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 provided on the side of the conductive reflective layer 401 away from the third surface 201. In other words, when the reflective coating 40 is provided on the second surface 102, the outer glass plate 10, the conductive reflective layer 401, the color adjustment layer 402, the bonding layer 30 and the inner glass plate 20 are stacked in sequence. 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 in sequence. The color adjustment layer 402 can adjust the outer surface reflection color of the laminated glass 100, so that when measured from the first surface 101 side, the laminated glass 100 has a reflection color Lab value for visible light with a wavelength in the range of 380nm-780nm incident at at least one incident angle of 55°, 60°, 65°, 70°, 75° and 80°, and the a value and the b value 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 and 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 content of silver in the conductive reflective layer 401 may be greater than or equal to 95%. The thickness of the conductive reflective layer 401 may be between 8 nm and 20 nm, and may be 8 nm, 9 nm, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm or 20 nm, and preferably between 10 nm and 16 nm.

[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 that of the low refractive index layer 421 .

[0077] The present application does not specifically limit the number of high refractive index layers 420 and the number of low refractive index layers 421 in the color adjustment layer 402. In a 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 can be understood that the color adjustment layer 402 is a laminated structure including at least one "high refractive index layer 420 / low refractive index layer 421", and the high refractive index layer 420 in each laminated 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 laminated structure, or two laminated structures, or three laminated structures, or four laminated structures, etc. Specifically, in an embodiment in which the color adjustment layer 402 includes one laminated structure, the color adjustment layer 402 includes a first high refractive index layer 420 and a first low refractive index layer 421 which are laminated. In an embodiment in which the color adjustment layer 402 includes two laminated 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 which are laminated in sequence. In an embodiment in which the color adjustment layer 402 includes three laminated 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 which are laminated in sequence. In an embodiment in which the color adjustment layer 402 includes a four-layer stacking structure, 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 in sequence.

[0079] The thickness of the high refractive index layer 420 may be the same as or different from the thickness of the low refractive index layer 421. In the embodiment where the color adjustment layer 402 comprises a plurality of stacked structures, the thicknesses of the plurality of high refractive index layers 420 may be the same as or different, and the thicknesses of the plurality of low refractive index layers 421 may be the same as or different.

[0080] In a possible embodiment, the physical thickness of any one of the high refractive index layers 420 is 5 nm to 80 nm, and the physical thickness of any one 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 a 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 some 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 the embodiment in which the color adjustment layer 402 includes greater than or equal to two 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 the embodiment where the color adjustment layer 402 includes a plurality of stacked-layer structures, the refractive indices of the plurality of high-refractive-index layers 420 may be the same or different, and the refractive indices of the plurality of low-refractive-index layers 421 may be the same or different.

[0085] In a possible embodiment, in order to better achieve the comprehensive requirements of the optical performance, mechanical performance, appearance color, etc. of the reflective coating 40, 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 can include 2 to 5 high refractive index sub-layers, and the difference in refractive index between two adjacent high refractive index sub-layers can 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 sub-layers. Similarly, in order to better achieve the comprehensive requirements of the optical performance, mechanical performance, appearance color, etc. of the reflective coating 40, 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 can include at least two low refractive index sub-layers, and the difference in refractive index between two adjacent low refractive index sub-layers can be greater than or equal to 0.1.

[0086] The material of the high refractive index layer 420 includes an oxide, nitride or oxynitride of at least one element or alloy of 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 material of the high refractive index layer 420 can be zinc tin oxide (ZnSnO X ), or titanium oxide (TiO X ), or niobium oxide (NbO X ), or silicon nitride (SiN X ), or silicon aluminum nitride (SiAlN X ), or silicon zirconium nitride (SiZrNX ), X The value of can be determined according to the deposition in a stoichiometric, substoichiometric or superstoichiometric manner in the magnetron sputtering process.

[0087] The material of the low refractive index layer 421 includes at least one of silicon, aluminum, magnesium, zirconium oxide, alloy oxide, oxynitride, carbide, or fluoride. For example, the material of the low refractive index layer 421 can be silicon oxide (SiO 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 of is determined according to whether the deposition is carried out in a stoichiometric, substoichiometric or superstoichiometric manner in the magnetron sputtering process.

[0088] In this embodiment, the color adjustment layer 402 includes at least one high refractive index layer 420 and at least one low refractive index layer 421 which are stacked, and the refractive index of the high refractive index layer 420 is greater than the refractive index of the low refractive index layer 421, so that the reflection color of the laminated glass 100 to visible light can be effectively adjusted, and the neutral color effect of the appearance of the laminated glass 100 can be improved. By making the refractive index of the high refractive index layer 420 greater than or equal to 1.8, and the refractive index of the low refractive index layer 421 less than 1.8, that is, the high refractive index layer 420 and the low refractive index layer 421 match, it is conducive to achieving the reflectivity of the reflective coating 40 to P polarized light, the extreme difference of reflection to P polarized light, and the reflection color of visible light. The refractive index in this application is measured based on light with a wavelength of 550nm.

[0089] For further information, please refer 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 can be 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 20nm to 80nm. The refractive index of the dielectric layer 403 is greater than or equal to 1.9.

[0090] Please refer to Figure 2 , Figure 3 and Figure 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 bonding layer 30 and the inner glass plate 20 are stacked in sequence. 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 bonding layer 30, the color adjustment layer 402, the conductive reflective layer 401, the dielectric layer 403 and the inner glass plate 20 are stacked in sequence.

[0091] The dielectric layer 403 includes 2 to 5 dielectric sublayers. 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. For example, the material of the dielectric sublayer can be zinc tin oxide (ZnSnO X ), or titanium oxide (TiO X ), or niobium oxide (NbO X ), X The value of can be determined according to whether the magnetron sputtering process is deposited in a stoichiometric, substoichiometric or superstoichiometric manner. 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] The present application does not impose any specific limitation on the number of layers of the dielectric layer 403. In order to better achieve the comprehensive requirements of the optical properties, mechanical properties, appearance color, etc. of the reflective coating 40, the dielectric layer 403 may 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 may be greater than or equal to 0.1, and further greater than or equal to 0.3. Preferably, the dielectric layer 403 may include three dielectric sublayers, namely, a first lower dielectric sublayer, a first middle dielectric sublayer, and a first upper dielectric sublayer are sequentially deposited from the second surface 102 of the outer glass plate 10 outward, 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, the refractive index of the first middle dielectric sublayer is greater than the refractive index 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 the refractive index of the first dielectric sublayer. or, a first lower dielectric sublayer, a first middle dielectric sublayer, and a first upper dielectric sublayer are sequentially deposited outward from the third surface 201 of the inner glass plate 20, the first lower dielectric sublayer is directly deposited on the third surface 201 of the inner glass plate 20, the first middle dielectric sublayer is deposited on the surface of the first lower dielectric sublayer facing away from the inner glass plate 20, the refractive index of the first middle dielectric sublayer is greater than the refractive index 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 the refractive index of the first middle dielectric sublayer.

[0093] By making the reflective coating 40 also include at least one dielectric layer 403, the conductive reflective layer 401 can be protected to prevent the material of the glass plate from migrating to the conductive reflective layer 401 during the lamination process. 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] For further information, please refer 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 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 0.5nm to 5nm, and specifically can be 0.5nm, 1nm, 2nm, 3nm, 4nm or 5nm. The protective layer 406 is the layer closest to the bonding layer 30 in the reflective coating 40. The physical thickness of the protective layer 406 is 7nm to 25nm, and specifically can be 7nm, 8nm, 10nm, 12nm, 15nm, 16nm, 18nm, 20nm, 22nm, 25nm, etc.

[0095] Please refer to Figure 2 , Figure 3 and Figure 7 , the reflective coating 40 further 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 in sequence. 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 in sequence.

[0096] Please refer to Figure 2 , Figure 3 and Figure 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, the dielectric layer 403, 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 in sequence. 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, the dielectric layer 403 and the inner glass plate 20 are stacked in sequence.

[0097] Please refer to Figure 2 , Figure 3 and Fig. 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 in sequence. 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 in sequence.

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

[0099] The material of the protective layer 406 is selected from at least one nitride or nitride 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 deposition is carried out in a stoichiometric, substoichiometric or superstoichiometric manner in a magnetron sputtering process.

[0100] By providing the barrier layer 404, the conductive reflective layer 401 can be protected from being oxidized or damaged by oxygen etc. during the magnetron sputtering process. By providing the protective layer 406, the overall protection can be formed, so that the overall chemical properties and corrosion resistance of the reflective coating 40 can be improved, and the optical properties of the reflective coating 40 can be adjusted.

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

[0102] The square resistance of the reflective coating 40 is less than 5Ω / □, making it suitable for electric heating, so that it can quickly dehumidify, defrost, defog, and even de-ice. Therefore, the laminated glass 100 provided in the present application can also have an electric heating function and is suitable for a power supply of 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 two electrodes of the power supply, respectively, so that the current is introduced into the reflective coating 40, so that the reflective coating 40 has at least 500W / m between the first busbar and the second busbar. 2 The heating power density is 0.04W. Wherein, the first busbar and the second busbar can be made of one or more of silver paste, copper foil and aluminum foil.

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

[0104] By making the total solar transmittance of the laminated glass 100 less than or equal to 62%, the total solar transmittance can be effectively reduced, the heat insulation effect of the laminated glass 100 can be effectively improved, and the heat insulation effect of the head-up display system using the laminated glass 100 can be effectively improved, which is more helpful to meet commercial needs and improve the user experience. By making the visible light transmittance of the laminated glass greater than 70%, the light transmittance of the laminated glass 100 can be guaranteed to meet the regulatory requirements for the front windshield.

[0105] Optionally, the thickness of the conductive reflective layer 401 may be 8 nm, or 10 nm, or 11 nm, or 14 nm, or 15 nm, or 16 nm, or 18 nm, or 20 nm. By making the thickness of the conductive reflective layer 401 within 8 nm-20 nm, the conductive reflective layer 401 can be prevented from being too thick or too thin. If the thickness of the conductive reflective layer 401 is less than 8 nm, the square 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 the P polarized light is too low, which is not conducive to ensuring that the reflectivity of the P polarized light is greater than or equal to 13%. At the same time, the total solar energy 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 20 nm, 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%, and the regulatory requirements for the front windshield cannot be met. It is also difficult to achieve a neutral color for the outer surface reflection color of the laminated glass 100, which affects 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 the total thickness of the reflective coating 40 is less than or equal to 210 nm, or the total thickness of the reflective coating 40 is less than or equal to 200 nm. Also preferably, the total thickness of the reflective coating 40 is greater than or equal to 100 nm, or the total thickness of the reflective coating 40 is greater than or equal to 120 nm, or the total thickness of the reflective coating 40 is greater than or equal to 150 nm.

[0107] Optionally, the single layer thickness of the reflective coating 40 is less than or equal to 70 nm, that is, the maximum thickness of any film layer or sub-layer 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 single layer thickness less than or equal to 80 nm, the reflective coating 40 can be prevented from being too thick, which is beneficial for producing the reflective coating 40 through a magnetron sputtering process and reducing production costs.

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

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

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

[0113]

[0114] The film structure, film material and film thickness of Examples 2-5 are shown in Table 2.

[0115] Table 2: Film structure, film material and film thickness of the reflective coating of Examples 2-5

[0116]

[0117]

[0118] In Table 1 and Table 2, the dielectric layer 403 is directly contacted with 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 material of the first low refractive index layer and the second low refractive index layer of the color adjustment layer 402 is 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.

[0119] Table 3: Test results of Comparative Examples 1-3 and Example 1

[0120]

[0121] The test results of Examples 2-5 in Table 2 are shown in Table 4.

[0122] Table 4: Test results of Examples 2-5

[0123]

[0124]

[0125] In Tables 3 and 4:

[0126] Visible light transmittance TL (%): the transmittance of the laminated glass 100 to vertically incident visible light measured and calculated according to standard ISO9050.

[0127] Total solar transmittance TTS (%): measured and calculated according to standard ISO9050.

[0128] Maximum reflectivity Rpmax (%): measured from the side of the fourth surface, the laminated glass has a maximum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65°; for example, when P-polarized light with a wavelength in the range of 450nm-650nm is incident at an incident angle of 65°, it has a maximum value at a wavelength of 600nm, then the reflectivity of P-polarized light with a wavelength of 600nm incident at an incident angle of 65° is the maximum reflectivity.

[0129] Minimum reflectivity Rpmin (%): measured from the side of the fourth surface, the laminated glass has a minimum reflectivity for P-polarized light with a wavelength in the range of 450nm-650nm incident at an incident angle of 65°; for example, when P-polarized light with a wavelength in the range of 450nm-650nm is incident at an incident angle of 65°, it has a minimum value at a wavelength of 500nm, then the reflectivity when P-polarized light with a wavelength of 600nm is incident at an incident angle of 65° is the minimum reflectivity.

[0130] 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.

[0131] like Fig.10As shown, Fig.10 is the reflection spectrum curve of Example 1-5. Combining Table 3, Table 4 and Fig.10 It can be seen that compared with comparative examples 1-3, the laminated glass 100 of examples 1-5 provided in the present application meets the following requirements:

[0132] 1. The sheet resistance of the reflective coating 40 is 2Ω / □ to 4Ω / □.

[0133] 2. The visible light transmittance of the laminated glass 100 is greater than or equal to 70%, and the total solar energy transmittance is less than or equal to 62%, even less than or equal to 60%, and even less than or equal to 58%.

[0134] 3. The laminated glass 100 has a minimum reflectivity Rpmin for P-polarized light with a wavelength of 450nm-650nm incident at an incident angle of 65°, Rpmin≥13%, or Rpmin≥15%.

[0135] 4. The laminated glass 100 has a reflection range of range≤3.5%, or range≤2.5%, or range≤2%, or range≤1.5%, or range≤1% for P polarized light with a wavelength of 450nm-650nm incident at an incident angle of 65°. The reflection range=Rpmax-Rpmin.

[0136] 5. When measuring the reflected color of the laminated glass 100 for visible light incident at incident angles of 55°, 60°, 65°, 70°, 75°, and 80° from the first surface 101, the a value is from -2 to 2 and the b value is from -2 to 2, or the a value is from -1 to 1 and the b value is from -2 to 2, or the a value is from -2 to 2 and the b value is from -1 to 1, or even the a value is from -1 to 1 and the b value is from -1 to 1, that is, the reflected color of the outer surface of the laminated glass 100 is close to neutral or is neutral when observed at 55°, or 55°-60°, or 55°-65°, or 55°-70°, or 55°-75°, or 55°-80°.

[0137] Comparative Examples 4-6 and Examples 6-10

[0138] Another laminated glass 100 is prepared, wherein the thickness of the outer glass plate 10 and the inner glass plate 20 of the laminated glass 100 are both transparent glass with a thickness of 2.1 mm, the adhesive layer 30 is wedge-shaped PVB with a thickness of 0.76 mm, and the reflective coating 40 is disposed on the second surface 102 of the outer glass plate 10. The film structures, film materials and film thicknesses of Comparative Examples 4-6 and Example 6 are shown in Table 4.

[0139] Table 5: Film structure, film material and film thickness of the reflective coatings of Comparative Examples 4-6 and Example 6

[0140]

[0141] The film structure, film material and film thickness of Examples 7-10 are shown in Table 6.

[0142] Table 6: Film structure, film material and film thickness of the reflective coating of Examples 7-10

[0143]

[0144] In Table 4 and Table 5, the dielectric layer 403 is directly contacted with 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 material of the first low refractive index layer and the second low refractive index layer of the color adjustment layer 402 is 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.

[0145] Table 7: Test results of Comparative Examples 4-6 and Example 6

[0146]

[0147]

[0148] The test results of Examples 7-10 in Table 6 are shown in Table 8.

[0149] Table 8: Test results of Examples 7-10

[0150]

[0151] In Tables 7 and 8: the measurement methods of visible light transmittance TL (%), total solar energy transmittance TTS (%), maximum reflectivity Rpmax (%), minimum reflectivity Rpmin (%), and reflected color Lab measured from the first surface side are the same as those in Tables 3 and 4.

[0152] like Fig.11 As shown, Fig.11 The reflectance spectrum curves of Examples 6-10 provided in this application. Fig.11 It can be seen that compared with comparative examples 4-6, the laminated glass 100 of examples 6-10 provided in the present application meets the following requirements:

[0153] 1. The sheet resistance of the reflective coating 40 is 2Ω / □ to 4Ω / □.

[0154] 2. The visible light transmittance of the 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%.

[0155] 3. The laminated glass 100 has a minimum reflectivity Rpmin for P-polarized light with a wavelength of 450nm-650nm incident at an incident angle of 65°, Rpmin≥13%, or Rpmin≥15%.

[0156] 4. The laminated glass 100 has a reflection range of range≤3.5%, or range≤2.5%, or range≤2%, or range≤1.5%, or range≤1% for P polarized light with a wavelength of 450nm-650nm incident at an incident angle of 65°. The reflection range=Rpmax-Rpmin.

[0157] 5. When measuring the reflected color of the laminated glass 100 for visible light incident at incident angles of 55°, 60°, 65°, 70°, 75°, and 80° from the first surface 101, the a value is from -2 to 2 and the b value is from -2 to 2, or even the a value is from -1 to 1 and the b value is from -1 to 1, that is, 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 at 55°-80°.

[0158] The features mentioned in the description, claims and drawings can be combined with each other as desired as long as they are meaningful within the scope of the present application. The advantages and features described for the laminated glass 100 are applicable to the head-up display system 1000 in a corresponding manner.

[0159] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims

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

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

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

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

5. The laminated glass according to any one of claims 1 to 4, It is characterized in that The reflective coating comprises a conductive reflective layer and a color adjustment layer, wherein the conductive reflective layer is made of silver metal or a silver alloy, wherein the silver alloy is an alloy of silver and at least one of gold, aluminum, copper, indium, nickel, chromium, tin, titanium and platinum; The color adjustment layer is closer to the bonding layer than the conductive reflective layer, and the color adjustment layer includes at least one high refractive index layer and at least one low refractive index layer stacked in layers, the high refractive index layers and the low refractive index layers 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, It is characterized in that The reflective coating also 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 20nm to 80nm, and the refractive index of the dielectric layer is greater than or equal to 1.

9.

7. The laminated glass according to claim 6, It is characterized in that The dielectric layer includes 2 to 5 dielectric sublayers, and 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.

8. The laminated glass according to claim 5, It is characterized in that The at least one high refractive index layer includes 2 to 5 high refractive index sub-layers, and the difference in refractive index between two adjacent high refractive index sub-layers is greater than or equal to 0.

1.

9. The laminated glass according to claim 5, It is characterized in that The reflective coating also includes a barrier layer, which is arranged between the conductive reflective layer and the color adjustment layer, and 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 8nm to 20nm, and the physical thickness of the barrier layer is 0.5nm to 5nm.

10. The laminated glass according to claim 5, It is 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, It is 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, It is 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, It is characterized in that The reflective coating further includes a protective layer, which is disposed on a side of the color adjustment layer away from the conductive reflective layer. The protective layer is a layer of the reflective coating closest to the bonding 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 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.

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

16. A head-up display system, Features: It comprises a projection device and the laminated glass according to any one of claims 1 to 15, wherein the projection device is used to generate projection light, the projection light contains at least 80% of P-polarized light, and the projection light is incident on the fourth surface of the laminated glass at an incident angle of 55° to 80°.

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