Head-up display glass, head-up display system and vehicle

Abstract

The invention provides head-up display glass, a head-up display system and a vehicle, the head-up display glass comprises an outer glass plate, an inner glass plate and a middle layer clamped between the outer glass plate and the inner glass plate, the outer glass plate comprises a first surface and a second surface, and the inner glass plate comprises a third surface and a fourth surface. The middle layer is connected to the second surface and the third surface; the head-up display glass is provided with a display area, and the display area is used for reflecting projection light to form a head-up display image; the head-up display glass further comprises a functional reflecting layer and a sub-image eliminating layer, the functional reflecting layer has at least 10% of reflectivity for P polarized light incident at the incidence angle of 55 degrees, the surface roughness of the sub-image eliminating layer is larger than or equal to 11 nm, and the functional reflecting layer and the sub-image eliminating layer are not located on the same surface. In the thickness direction of the head-up display glass, the functional reflection layer at least covers the sub-image elimination layer, and the sub-image elimination layer at least covers the display area.

Description

Technical Field

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

[0002] With the development of vehicle technology, consumers have higher and higher requirements for vehicle driving safety. Therefore, the application of head-up display (HUD) function in modern vehicles has become increasingly widespread. The HUD function is usually applied to the front windshield, and its purpose is to minimize the driver's line of sight while driving, so as to enhance the safety of the vehicle while driving.

[0003] However, the existing front windshield generally uses laminated glass, which is composed of at least two glass plates with a certain curvature and a polymer adhesive layer. When the projection light emitted by the projection device of the head-up display system passes through the two surfaces of the laminated glass in contact with the air, it will be reflected, and the reflected light on the two surfaces will be offset, so that the images formed by the reflected light on the two surfaces interfere with each other and form a double image. The double image will interfere with the driver's vision while driving, reducing the safety of the vehicle while driving.

[0004] The projection light emitted by a traditional projection device is mainly S-polarized light. To eliminate ghosting, a wedge-shaped polymer adhesive layer or a wedge-shaped glass plate can be used to make the upper and lower thicknesses of the laminated glass change in a wedge shape, so that the reflected images on the two surfaces seen by the driver basically overlap, which can ultimately greatly eliminate the ghosting problem, such as patents CN101038349A, US2002172804A1 and US2007148472A1.

[0005] There is also a technical solution in the prior art that utilizes the Brewster effect of P-polarized light to eliminate ghosting. The projection light emitted by the projection device is mainly P-polarized light. When the P-polarized light enters the glass from the air or enters the air from the glass at the Brewster angle, there is almost no reflection, thereby eliminating ghosting. For example, patents CN114341710A and CN114710955A, etc., have a better effect of eliminating ghosting when the incident angle is the Brewster angle or a small angle deviating from the Brewster angle. However, since the existing vehicle technology tends to increase the inclination of the front windshield, the incident angle of the projection light incident on the laminated glass is getting larger and larger, and the incident angle may even reach 75°. When the P-polarized light enters the glass from the air or enters the air from the glass at an incident angle of more than 70°, there is still a high reflectivity, for example, greater than 3% or even greater than 5%, which leads to the problem that the P-polarized light incident at an incident angle of more than 70° has a serious decrease in the reflectance ratio of the primary and secondary images, and it is still impossible to eliminate ghosting in practical applications. Moreover, with the popularization and application of AR-HUD, the field of view FOV of the head-up display system is getting larger and larger, for example, above 10°×3°. Although there is no ghosting in the central area of ​​the head-up display image, the incident angle of the projection light in the edge area of ​​the head-up display image deviates a lot from the Brewster angle, resulting in a serious decrease in the reflectance ratio of the primary and secondary images in the edge area. In practical applications, ghosting still cannot be eliminated. Summary of the invention

[0006] The purpose of this application is to provide a head-up display glass, a head-up display system and a vehicle, which can eliminate the ghosting of the head-up display image, realize ghost-free head-up display with high incident angle and large field of view FOV, and improve the safety of the vehicle while driving.

[0007] In a first aspect, an embodiment of the present application provides a head-up display glass. The head-up display glass comprises an outer glass plate, an inner glass plate, and an intermediate layer sandwiched between the outer glass plate and the inner glass plate, the outer glass plate comprises a first surface and a second surface, the first surface and the second surface are arranged opposite to each other along the thickness direction of the outer glass plate, the inner glass plate comprises a third surface and a fourth surface, the third surface and the fourth surface are arranged opposite to each other along the thickness direction of the inner glass plate, and the intermediate layer is connected to the second surface and the third surface.

[0008] The head-up display glass has a display area, and the display area is used to reflect projection light to form a head-up display image.

[0009] The head-up display glass also includes a functional reflective layer and a secondary image elimination layer, the functional reflective layer has a reflectivity of at least 10% for P-polarized light incident at an incident angle of 55°, the surface roughness of the secondary image elimination layer is greater than or equal to 11 nm, and the functional reflective layer and the secondary image elimination layer are not located on the same surface.

[0010] Along the thickness direction of the head-up display glass, the functional reflective layer at least covers the secondary image elimination layer, and the secondary image elimination layer at least covers the display area.

[0011] In one embodiment, the secondary image elimination layer is disposed on the first surface, and / or the second surface, and / or the third surface, and / or the fourth surface.

[0012] The functional reflective layer is disposed on the second surface, and / or the third surface, and / or the fourth surface, and / or in the intermediate layer.

[0013] In one embodiment, the head-up display glass includes a light-transmitting area and a shielding area, the visible light transmittance of the light-transmitting area is greater than or equal to 70%, the visible light transmittance of the shielding area is less than or equal to 5%, the visible light transmittance of the display area is greater than or equal to 70%, the display area is located in the light-transmitting area, and the functional reflective layer at least covers the light-transmitting area.

[0014] In one embodiment, the functional reflective layer is closer to the fourth surface than the secondary image elimination layer.

[0015] In one embodiment, the number of the secondary image elimination layers is two, and the secondary image elimination layers are disposed on the first surface and the fourth surface.

[0016] In one embodiment, the number of the secondary image elimination layer is only one, and the secondary image elimination layer is disposed on the first surface or the fourth surface.

[0017] In one embodiment, the secondary image elimination layer is disposed on the first surface and / or the second surface, and the secondary image elimination layer is formed by etching and removing a portion of glass material in a thickness direction of the outer glass plate.

[0018] In one embodiment, the secondary image elimination layer is disposed on the third surface and / or the fourth surface, and the secondary image elimination layer is formed by etching and removing a portion of glass material in a thickness direction of the inner glass plate.

[0019] In one embodiment, the etching removal process is an ion source process, a high-power pulsed magnetron sputtering process or a chemical etching process.

[0020] In one embodiment, the surface roughness of the secondary image elimination layer is greater than or equal to 15 nm and less than or equal to 100 nm.

[0021] In one embodiment, the surface roughness of the secondary image elimination layer is greater than or equal to 35 nm and less than or equal to 75 nm.

[0022] In one embodiment, the functional reflective layer is selected from at least one of a high-low refractive index stack, a metal stack, a holographic film, and a stacked polymer film.

[0023] In one embodiment, the head-up display glass further includes a heat insulation layer, and the heat insulation layer is selected from at least one of a single silver nano-coating, a double silver nano-coating, a triple silver nano-coating, a quadruple silver nano-coating, an ITO nano-coating, a FTO nano-coating, and an infrared blocking micro-coating. The total solar energy transmittance of the head-up display glass having the heat insulation layer is less than or equal to 55%.

[0024] In one embodiment, the secondary image elimination layer and the heat insulation layer are located on the same surface, and the heat insulation layer does not exist in the area where the secondary image elimination layer is located.

[0025] In a second aspect, an embodiment of the present application provides a head-up display system. The head-up display system includes a projection device and the head-up display glass, wherein the projection device is located on one side of the inner glass plate and emits projection light to the display area of ​​the head-up display glass, and the projection light contains at least 80% of P-polarized light.

[0026] The functional reflection layer reflects the incident projection light to form a main image of the head-up display image, and the secondary image elimination layer diffusely reflects the incident projection light to form a secondary image of the head-up display image.

[0027] The functional reflective layer has a first main image reflectivity Rp10 for P polarized light incident at an incident angle of 55°, and Rp10≥10%.

[0028] The secondary image eliminating layer has a first secondary image reflectivity Rp11 for P polarized light incident at an incident angle of 55°, and Rp11≤0.01%.

[0029] In one embodiment, the functional reflective layer has a second main image reflectivity Rp20 for P-polarized light incident at an incident angle of 60°, and Rp20≥12%.

[0030] The secondary image eliminating layer has a second secondary image reflectivity Rp21 for P polarized light incident at an incident angle of 60°, and Rp21≤0.05%.

[0031] In one embodiment, the functional reflective layer has a third main image reflectivity Rp30 for P-polarized light incident at an incident angle of 65°, and Rp30≥15%.

[0032] The secondary image eliminating layer has a third secondary image reflectivity Rp31 for P polarized light incident at an incident angle of 65°, and Rp31≤0.8%.

[0033] In one embodiment, the functional reflective layer has a fourth main image reflectivity Rp40 for P-polarized light incident at an incident angle of 70°, and Rp40 ≥ 20%.

[0034] The secondary image eliminating layer has a fourth secondary image reflectivity Rp41 for P polarized light incident at an incident angle of 70°, and Rp41≤2.5%.

[0035] In one embodiment, the functional reflective layer has a fifth main image reflectivity Rp50 for P-polarized light incident at an incident angle of 75°, and Rp50 ≥ 28%.

[0036] The secondary image eliminating layer has a fifth secondary image reflectivity Rp51 for P polarized light incident at an incident angle of 75°, and Rp51≤4%.

[0037] In a third aspect, an embodiment of the present application provides a vehicle, comprising a vehicle body and the head-up display system, wherein the head-up display system is installed at an opening of the vehicle body, and the projection device is installed inside the vehicle body.

[0038] The present application provides a head-up display glass, a head-up display system and a vehicle. By forming a secondary image elimination layer in a local area of ​​the head-up display glass, the reflectivity of P-polarized light when entering the glass from the air or from the glass into the air at a high angle of incidence is greatly reduced, that is, the secondary image reflectivity of the head-up display image is greatly reduced, and the main and secondary image reflectivity ratio of the head-up display image can be greatly improved, so as to achieve the effect of eliminating ghosting at high incident angles and large field of view FOV, making the head-up display image quality clearer. Therefore, the clarity and readability of HUD imaging at higher incident angles (55°~75°) are met, and the safety of the vehicle during driving is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of the vehicle provided for this application;

[0040] Figure 2 A cross-sectional schematic diagram of a first embodiment of a head-up display system provided by the present application;

[0041] Figure 3 A schematic diagram of the top view structure of the head-up display glass provided in this application;

[0042] Figure 4 A cross-sectional schematic diagram of a second embodiment of the head-up display system provided by the present application;

[0043] Figure 5 A cross-sectional schematic diagram of a third embodiment of the head-up display system provided by the present application;

[0044] Figure 6A schematic cross-sectional view of a fourth embodiment of the head-up display system provided in the present application.

[0045] The nouns corresponding to the various figure marks in the figure are: vehicle 1000, vehicle body 200, head-up display system 100, head-up display glass 10, light-transmitting area 11, shielding area 12, display area 13, outer glass plate 14, first surface 141, second surface 142, middle layer 15, inner glass plate 16, third surface 161, fourth surface 162, functional reflective layer 17, first shielding layer 18, second shielding layer 19, projection device 20, projection light a, secondary image elimination layer M, incident angle θ. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0047] In the embodiments of the present application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. And "multiple" in this application refers to two or more.

[0048] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of the vehicle provided for this application, Figure 2 A schematic cross-sectional view of a first embodiment of a head-up display system provided in the present application.

[0049] An embodiment of the present application provides a vehicle 1000, such as Figure 1 The vehicle 1000 may be, but is not limited to, a sedan, a multi-purpose vehicle (MPV), a sport / suburban utility vehicle (SUV), an off-road vehicle (ORV), a pickup truck, a van, a bus, a truck, etc. In the specific implementation of the present application, the vehicle 1000 takes a sedan as an example.

[0050] For ease of description, in this application, the width direction of the vehicle 1000 is defined as the X-axis direction, the length direction is defined as the Y-axis direction, and the height direction is defined as the Z-axis direction; wherein the X-axis, Y-axis, and Z-axis directions are perpendicular to each other.

[0051] It should be noted that the directional terms such as "top", "bottom", "left", "right", "front" and "back" mentioned in the description of this application are based on the attached specification. Figure 1 The description of the orientation of the vehicle 1000 shown is based on the forward direction in the length direction of the vehicle 1000 as the positive direction of the X-axis, the direction from the left to the right in the width direction of the vehicle 1000 as the positive direction of the Y-axis, and the direction away from the ground in the width direction of the vehicle 1000 as the positive direction of the Z-axis.

[0052] like Figure 1 and Figure 2 As shown, the vehicle 1000 includes a head-up display system 100 and a vehicle body 200. The head-up display system 100 includes a head-up display glass 10 and a projection device 20. The head-up display glass 10 is installed at the opening of the vehicle body 200, and the head-up display glass 10 divides the vehicle body 200 into the outside of the vehicle body 200 and the inside of the vehicle body 200. The projection device 20 is installed inside the vehicle body 200. It should be noted that the head-up display glass 10 can be used as the front windshield, rear windshield, side window glass, corner window glass or sunroof glass of the vehicle 1000. In the specific implementation manner of the present application, the head-up display glass 10 is described and illustrated by taking the front windshield as an example.

[0053] The projection device 20 is used to emit the projection light a. The head-up display glass 10 is used to reflect the projection light a and allow the reflected projection light a to enter the driver's eyes to form a head-up display image, so that the driver can observe the head-up display image without lowering his head, allowing the driver's line of sight to observe the real-time situation outside the vehicle body 200 for a longer time, and at the same time, it is easier to obtain necessary information for auxiliary driving such as driving information and entertainment information, greatly improving the safety of the vehicle 1000 when driving.

[0054] In this embodiment, the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 75°. The projection light a mainly contains P polarized light. Exemplarily, the projection light a contains at least 80% P polarized light. The higher the proportion of P polarized light in the projection light a, the more conducive it is to eliminating the ghosting phenomenon of HUD imaging and the more it can meet the needs of the driver wearing polarization selective sunglasses to observe the head-up display image. Optionally, the projection light a contains at least 90% P polarized light, or the projection light a contains at least 95% P polarized light, or the projection light a contains at least 99% P polarized light, or even the projection light a contains 100% P polarized light.

[0055] See also Figure 3 , Figure 3 This is a schematic diagram of the top view of the head-up display glass provided in this application. It should be noted that: Figure 3 Schematic diagram of the structure of the head-up display glass observed by the eyes from the interior side of the vehicle.

[0056] In this embodiment, the head-up display glass 10 has a light-transmitting area 11 and a shielding area 12. The shielding area 12 is arranged circumferentially around the light-transmitting area 11. The light-transmitting area 11 has a high visible light transmittance, which allows the driver to observe the outside environment through the light-transmitting area 11. The shielding area 12 is usually called a black border area. The shielding area 12 has a low visible light transmittance, which is used to shield, protect and enhance the overall aesthetics. Exemplarily, the visible light transmittance of the light-transmitting area 11 is greater than or equal to 70%. The visible light transmittance of the shielding area 12 is less than or equal to 5%.

[0057] At least one display area 13 ( Figure 3 The display area 13 is used to reflect the incident projection light a to form a head-up display image. The head-up display image can display the driving information of the vehicle 1000, various patterns or play videos, and can also be used in various scenes such as welcoming guests, creating atmosphere, watching movies and working. Specifically, the head-up display image is used to display driving parameters, including vehicle speed, engine speed, fuel consumption, tire pressure, warning information, mileage, etc. It can also be used to display weather temperature, entertainment information, and can also be used for dynamic navigation, night vision, real-life maps, etc. The display area 13 is located in the light-transmitting area 11, that is, the orthographic projection of the display area 13 along the thickness direction of the head-up display glass 10 is located in the light-transmitting area 11. The number of display areas 13 can be as follows: Figure 3 In other embodiments, the number of display areas 13 may be two, three or even more. When the number of display areas 13 is greater than or equal to two, the total area of ​​the display areas 13 is equal to the sum of the areas of all display areas 13. The shape of the display area 13 may be as follows: Figure 3 The rectangle shown can of course also be a triangle, a circle, a trapezoid, etc.

[0058] It should be noted that the shape of the display area 13 and the number of the display areas 13 can be set according to the actual application requirements of the vehicle 1000, and are not limited to the following. Figure 3 The shape and number of display areas 13 are shown.

[0059] Please refer again Figure 2 and Figure 3The head-up display glass 10 is a laminated glass structure. The head-up display glass 10 includes an outer glass plate 14, an intermediate layer 15, and an inner glass plate 16. The outer glass plate 14, the intermediate layer 15, and the inner glass plate 16 are stacked in sequence along the thickness direction of the head-up display glass 10. The intermediate layer 15 connects the outer glass plate 14 and the inner glass plate 16. When the head-up display glass 10 is installed on the vehicle body 200, the outer glass plate 14 faces the outside of the vehicle body 200, and the inner glass plate 16 faces the inside of the vehicle body 200.

[0060] The outer glass plate 14 may be at least one of soda-lime glass, high-aluminum glass, lithium-aluminum glass, or borosilicate glass. The outer glass plate 14 includes a first surface 141 and a second surface 142. The first surface 141 and the second surface 142 are disposed opposite to each other along the thickness direction of the outer glass plate 14. When the head-up display glass 10 is mounted on the vehicle body 200, the first surface 141 of the outer glass plate 14 faces the outside of the vehicle body 200 and serves as the outer surface of the head-up display glass 10, which is the surface of the head-up display glass 10 in contact with the air outside the vehicle. The second surface 142 of the outer glass plate 14 faces the intermediate layer 15.

[0061] The inner glass plate 16 may be at least one of soda-lime glass, high-aluminum glass, lithium-aluminum glass, or borosilicate glass. The inner glass plate 16 includes a third surface 161 and a fourth surface 162. The third surface 161 and the fourth surface 162 are disposed opposite to each other along the thickness direction of the inner glass plate 16. When the head-up display glass 10 is mounted on the vehicle body 200, the fourth surface 162 of the inner glass plate 16 faces the interior of the vehicle body 200 and serves as the inner surface of the head-up display glass 10, which is the surface of the head-up display glass 10 in contact with the air in the vehicle. The third surface 161 of the inner glass plate 16 faces the intermediate layer 15.

[0062] The outer glass plate 14 is transparent glass or tinted glass, and the thickness of the outer glass plate 14 is 1.5 mm to 4 mm. The visible light transmittance of the outer glass plate 14 is greater than or equal to 70%. The inner glass plate 16 is transparent glass or tinted glass, and the thickness of the inner glass plate 16 is greater than or equal to 0.7 mm to 3.5 mm. The visible light transmittance of the inner glass plate 16 is greater than or equal to 70%. Exemplarily, the outer glass plate 14 and the inner glass plate 16 are both transparent glass with a thickness of 2.1 mm and a visible light transmittance of 88%.

[0063] The intermediate layer 15 is connected to the second surface 142 of the outer glass plate 14 and the third surface 161 of the inner glass plate 16. The intermediate layer 15 is used to bond the outer glass plate 14 and the inner glass plate 16 together to form a head-up display glass 10 of a laminated glass structure, so that the head-up display glass 10 meets the safety standards and regulatory requirements of more scenarios. The thickness of the intermediate layer 15 is 0.5 mm to 2.28 mm. For example, the thickness of the intermediate layer 15 can be but is not limited to 0.5 mm, or 0.76 mm, or 1.14 mm, or 1.52 mm, or 1.9 mm, or 2.28 mm. The intermediate layer 15 is a transparent thermoplastic polymer film or a colored thermoplastic polymer film. 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 (SGP). When the middle layer 15 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 middle layer 15 can be, but not limited to, 80%, 85%, 90%, 95%, etc. When the middle layer 15 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 middle layer 15 can be, but not limited to, 80%, 85%, 90%, etc. The colored thermoplastic polymer film can be a gray thermoplastic polymer film, a green thermoplastic polymer film, or a blue thermoplastic polymer film. The middle layer 15 can be a single-layer structure or a multi-layer structure. The multi-layer structure can be, for example, a double-layer structure, a three-layer structure, a four-layer structure, a five-layer structure, etc. The middle layer 15 may also have other functions, such as providing at least one colored area as a shadow band to reduce the interference of sunlight to the eyes, or adding an infrared absorber to have a sunscreen or heat insulation function, or adding an ultraviolet absorber to have an ultraviolet shielding function, or at least one layer of the multilayer structure has a higher plasticizer content to have a sound insulation function. Exemplarily, the middle layer 15 is made of transparent PVB with a thickness of 0.76 mm and a visible light transmittance of 88%.

[0064] The head-up display glass 10 also includes a functional reflective layer 17. The functional reflective layer 17 at least covers the light-transmitting area 11. That is, the area of ​​the functional reflective layer 17 is greater than or equal to the area of ​​the light-transmitting area 11. The functional reflective layer 17 is used to increase the reflectivity of the head-up display glass 10 to P-polarized light. When the projection light a is incident on the display area 13 of the head-up display glass 10, the functional reflective layer 17 can reflect the projection light a, and the reflected projection light a forms a head-up display image that can be observed by the driver. The functional reflective layer 17 can be provided on the second surface 142 of the outer glass plate 14, and / or on the third surface 161 of the inner glass plate 16, and / or on the fourth surface 162 of the inner glass plate 16, and / or in the intermediate layer 15. Figure 2 In the embodiment, the functional reflective layer 17 is disposed on the fourth surface 162 of the inner glass plate 16. Exemplarily, the functional reflective layer 17 covers at least 70% of the fourth surface 162, or at least 80%, or at least 85%, or at least 90%, or at least 95%, or even 100%.

[0065] The functional reflective layer 17 is used to improve the reflectivity of the display area 13 to P polarized light. The functional reflective layer 17 can be at least one of a high-low refractive index stack, a metal stack, a holographic film, a stacked polymer film, and the like.

[0066] The functional reflective layer 17 may be a high-low refractive index stack, the high-low refractive index stack includes at least one stacked structure, each stacked structure includes a high refractive index layer and a low refractive index layer stacked in sequence, the refractive index of the high refractive index layer is greater than or equal to 1.9, the refractive index of the low refractive index layer is less than 1.8, the physical thickness of the high-low refractive index stack is 100nm to 800nm, and the high refractive index layer and the low refractive index layer may be deposited on the fourth surface 162 by a physical vapor deposition process (PVD), in particular, a magnetron sputtering process. The high-low refractive index stack may consist of only one "high refractive index layer / low refractive index layer" stacked structure, or may include at least two stacked structures, for example, may consist of two stacked structures, three stacked structures, or four stacked structures. The material of the high refractive index layer may include oxides or alloy oxides or nitrides or oxynitrides of zirconium (Zr), niobium (Nb), silicon (Si), antimony (Sb), tin (Sn), zinc (Zn), indium (In), aluminum (Al), nickel (Ni), chromium (Cr), magnesium (Mg), manganese (Mn), vanadium (V), tungsten (W), hafnium (Hf), tantalum (Ta), molybdenum (Mo), gallium (Ga), yttrium (Y), bismuth (Bi), titanium (Ti), etc., and specific examples include zinc tin oxide (ZnSnO x ), titanium oxide (TiO x ), niobium oxide (NbO x ), silicon nitride (SiN x ), Silicon Aluminum Nitride (SiAlN x ), silicon zirconium nitride (SiZrN x ) etc. In order to better achieve that the optical properties, mechanical properties and appearance color of the functional reflective layer 17 meet the comprehensive requirements of vehicle window glass, the high refractive index layer can be a single-layer structure or a multi-layer structure, for example, including at least two 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. The material of the low refractive index layer can include oxides or alloy oxides or nitrogen oxides or carbides or fluorides of silicon (Si), aluminum (Al), magnesium (Mg), zirconium (Zr), etc., and specific examples include silicon oxide (SiO2), silicon aluminum oxide (SiAlO x), silicon zirconium oxide (SiZrO x ), aluminum oxide (Al2O3), magnesium oxide (MgO), magnesium fluoride (MgF), etc. In order to better achieve that the optical properties, mechanical properties and appearance color of the functional reflective layer 17 meet the comprehensive requirements of vehicle window glass, the low refractive index layer can be a single-layer structure or a multi-layer structure, for example, including at least two low refractive index sub-layers.

[0067] The functional reflective layer 17 may be a metal stack, which includes at least two dielectric layers and at least one metal layer, each metal layer being located between two adjacent dielectric layers, and the physical thickness of the metal stack is 100 nm to 500 nm, and the metal layer and the dielectric layer may be deposited on the second surface 142 or the third surface 161 by a physical vapor deposition process (PVD), in particular a magnetron sputtering process. The number of metal layers may be 1, 2, 3, 4 or 5, and the material of the metal layer may be selected from at least one of silver (Ag), gold (Au), copper (Cu) and aluminum (Al), and the material of the metal layer may preferably be silver or a silver alloy. The silver alloy is an alloy of silver and at least one of copper (Cu), gold (Au), platinum (Pt), nickel (Ni), chromium (Cr), titanium (Ti), aluminum (Al), indium (In), zinc (Zn), and tin (Sn), and the silver content in the silver alloy is greater than or equal to 90%, preferably greater than or equal to 95%. The material of the dielectric layer is selected from at least one oxide, nitride, or oxynitride of Zn, Ti, Si, Al, Sn, Se, Zr, Ni, In, Cr, W, Ca, Y, Nb, Cu, and Sm. For example, zinc tin oxide (ZnSnO x ), aluminum-doped zinc oxide (AZO), titanium oxide (TiO x ), silicon zirconium nitride (SiZrN), silicon aluminum nitride (SiALN), silicon aluminum oxide (SiAlO), etc.

[0068] The functional reflective layer 17 can be a holographic film. A holographic (HOE) film refers to a film based on the principle of holographic action. An interference pattern is formed in the holographic film. After the projection light a is incident on the holographic film, it diffracts under the action of the interference pattern to form an image that can be observed by the occupants of the vehicle. The use of a holographic film is conducive to improving the geometric design freedom of the incident angle of the projection light a and is conducive to reducing or even eliminating ghosting. Preferably, the thickness of the holographic film is preferably 100 μm to 600 μm, and specific examples include 100 μm, 120 μm, 150 μm, 180 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 550 μm, 600 μm, etc., and more preferably 50 μm to 300 μm.

[0069] The functional reflective layer 17 can be a laminated polymer film, and the thickness of the laminated polymer film is preferably 20μm to 500μm, and specific examples include 20μm, 50μm, 80μm, 100μm, 120μm, 150μm, 180μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, 500μm, etc., and more preferably 50μm to 300μm. The laminated polymer film is composed of dozens, hundreds or even thousands of layers of two resin films with different refractive indices alternately laminated together, and the material of the resin film can be at least one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), syndiotactic polystyrene (sPS), polybutylene terephthalate (PBT), polycyclohexane dimethyl terephthalate (PCT), polyetherimide (PEI) and polymethacrylimide (PMI). The laminated polymer film can be obtained on the market, for example, from 3M Company, Toray Industries, Ltd., Sekisui Chemical Industry Co., Ltd., and Eastman Chemical Company.

[0070] The functional reflective layer 17 described in the present application has a reflectivity of at least 10% for P polarized light incident at an incident angle of 55°. Specifically, taking the functional reflective layer 17 as a high-low refractive index stack as an example, the medium refractive index sublayer, the high refractive index sublayer and the low refractive index sublayer are sequentially deposited on the fourth surface 162 of the inner glass plate 16 by a magnetron sputtering process.

[0071] The refractive index of the medium refractive index sublayer is greater than or equal to 1.7 and less than 2.1. The material of the medium refractive index sublayer may include oxides or alloy oxides or nitrides or oxynitrides of zirconium (Zr), niobium (Nb), silicon (Si), antimony (Sb), tin (Sn), zinc (Zn), indium (In), aluminum (Al), nickel (Ni), chromium (Cr), magnesium (Mg), manganese (Mn), vanadium (V), tungsten (W), hafnium (Hf), tantalum (Ta), molybdenum (Mo), gallium (Ga), yttrium (Y), bismuth (Bi), titanium (Ti), etc., and specific examples include SiN x 、SiAlN x 、SiBN x 、SiTiN x 、SiZrN x 、ZnAlO x 、ZnO x , AZO, ZnSnO x 、SiN x O y 、SiBN x O y 、SiTiN x O y 、SiAlN x O y、SiZrN x O y At least one of the above. Wherein, x is greater than 1 and less than or equal to 3, and y is greater than 1 and less than 3. For example, the medium refractive index sublayer is selected to have a thickness of 20.1 nm and a material of ZnSnO x of the film layer.

[0072] The refractive index of the high refractive index sublayer is greater than or equal to 2.1 and less than or equal to 2.72. The material of the high refractive index sublayer may include oxides or alloy oxides or nitrides or oxynitrides of zirconium (Zr), niobium (Nb), silicon (Si), antimony (Sb), tin (Sn), zinc (Zn), indium (In), aluminum (Al), nickel (Ni), chromium (Cr), magnesium (Mg), manganese (Mn), vanadium (V), tungsten (W), hafnium (Hf), tantalum (Ta), molybdenum (Mo), gallium (Ga), yttrium (Y), bismuth (Bi), titanium (Ti), etc., and specific examples include TiN x 、ZrN x 、NbO x 、ZrO x 、TiO x At least one of the above, wherein x is greater than 1 and less than 3. Exemplarily, the high refractive index sublayer is a film layer with a thickness of 59.1 nm and a material of TiO2.

[0073] The refractive index of the low refractive index sublayer is greater than or equal to 1.46 and less than 1.7. The material of the low refractive index sublayer may include oxides or alloy oxides or nitrides or oxynitrides of zirconium (Zr), niobium (Nb), silicon (Si), antimony (Sb), tin (Sn), zinc (Zn), indium (In), aluminum (Al), nickel (Ni), chromium (Cr), magnesium (Mg), manganese (Mn), vanadium (V), tungsten (W), hafnium (Hf), tantalum (Ta), molybdenum (Mo), gallium (Ga), yttrium (Y), bismuth (Bi), titanium (Ti), etc., and specific examples include SiO x 、SiBO x 、SiTiO x 、SiAlO x 、SiZrO x 、SiN x O y 、SiBN x O y 、SiTiN x O y 、SiAlN x O y 、SiZrN x O yAt least one of the above, wherein x is greater than 1 and less than or equal to 3, and y is greater than 1 and less than 3. Exemplarily, the low refractive index sublayer is a film layer with a thickness of 103.6 nm and a material of SiO2.

[0074] It should be noted that in order to better achieve that the optical properties, mechanical properties and appearance color of the functional reflective layer 17 all meet the comprehensive requirements of the window glass for vehicle 1000, the medium refractive index sublayer, the high refractive index sublayer and the low refractive index sublayer can all be single-layer structures, or can all be multi-layer structures, for example, including at least two of the medium refractive index sublayers, at least two of the high refractive index sublayers and / or at least two of the low refractive index sublayers.

[0075] The head-up display glass 10 further includes a first shielding layer 18. The first shielding layer 18 is located in the shielding area 12. The first shielding layer 18 may be connected to the second surface 142 of the outer glass plate 14, and / or connected to the third surface 161 of the inner glass plate 16, and / or connected to the fourth surface 162 of the inner glass plate 16, and / or disposed in the intermediate layer 15. Figure 2 In the embodiment, the first shielding layer 18 is located on the second surface 142 of the outer glass plate 14 and surrounds the edge of the second surface 142 .

[0076] The material of the first shielding layer 18 is selected from at least one of dark ink, opaque polymer film, and dimming film. The dark ink may be ceramic ink or ultraviolet ink, which is printed on the second surface 142, the third surface 161, and / or the fourth surface 162 by screen printing, inkjet printing, or other processes, and then cured or sintered at high temperature to form the first shielding layer 18; the thickness of the first shielding layer 18 formed by the dark ink is 5 μm to 40 μm.

[0077] The opaque polymer film may be a polymer film with body coloring, for example, black or brown coloring components are added during the manufacturing process of the polymer film, etc.; it may also be a polymer film with surface printed ink, paint or pigment, for example, black ink, black paint or brown pigment is printed on the surface of the polymer film, etc.; it may also be a dyed or colored polymer film, for example, the polymer film is colored with black or brown dyes, etc.; the material of the polymer film may be polyvinyl butyral (PVB), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polycarbonate (PC), polymethyl methacrylate (PMMA), etc.; the opaque polymer film is arranged in the middle layer 15, for example, the middle layer 15 may be two sheets of thermoplastic polymer films, and the opaque polymer film is sandwiched between the two sheets of thermoplastic polymer films.

[0078] The dimming film can be a polymer dispersed liquid crystal film (PDLC), a suspended particle film (SPD), an electrochromic film (EC), a dye liquid crystal film (LC), etc. The minimum visible light transmittance of the dimming film is less than or equal to 3%, such as 3%, 2%, 1%, 0.5%, 0%. In addition, the maximum visible light transmittance of the dimming film is set as needed, such as 10%, 20%, 30%, 50%, 70%, 80%, etc. For example: the visible light transmittance of the dimming film can be adjusted between 0% and 20%, between 0.5% and 50%, between 0% and 70%, etc. The dimming film can meet the use requirements of different visible light transmittances in multiple scenarios.

[0079] In this embodiment, two sheets of soda-lime glass with a thickness of 2.1 mm are used as the inner glass plate 16 and the outer glass plate 14 of the head-up display glass 10, and the inner glass plate 16 is placed in a magnetron sputtering coating line for coating deposition, so that a plurality of the medium refractive index sub-layers, a plurality of the high refractive index sub-layers, and a plurality of the low refractive index sub-layers are alternately deposited on the fourth surface 162 of the inner glass plate 16 to form a functional reflective layer 17. Next, the outer glass plate 14 and the inner glass plate 16 with the functional reflective layer 17 are processed according to the bending forming process of automobile glass to obtain the outer glass plate 14 and the inner glass plate 16 with a curved shape. Then, an intermediate layer 15 made of transparent PVB with a thickness of 0.76 mm is sandwiched between the curved outer glass plate 14 and the inner glass plate 16, and the processing is carried out according to the lamination process of automobile glass to form the head-up display glass 10 described in this embodiment.

[0080] like Figure 2 As shown, the projection device 20 in the head-up display system 100 emits a projection light a to the head-up display glass 10, and the projection light a is directly incident on the functional reflective layer 17. On the surface of the functional reflective layer 17 that contacts the air inside the vehicle, part of the projection light a is directly reflected by the functional reflective layer 17 to form a first reflected light, and another part of the projection light a forms a first refracted light. The first reflected light can directly enter the driver's eyes to form a main image of the head-up display image.

[0081] The first refracted light enters the functional reflective layer 17 and the head-up display glass 10. Since the thickness of the functional reflective layer 17 is small and the refractive indexes of the intermediate layer 15, the inner glass plate 16 and the outer glass plate 14 are similar, the propagation path of the first refracted light remains basically unchanged. The first refracted light sequentially passes through the functional reflective layer 17, the inner glass plate 16, the intermediate layer 15, the outer glass plate 14 and reaches the first surface 141 of the outer glass plate 14. According to the reflection characteristics of light and the reversibility of light propagation, at the surface of the first surface 141 in contact with the air outside the vehicle, part of the first refracted light is reflected by the first surface 141 to form the second reflected light, and another part of the first refracted light enters the air outside the vehicle through the first surface 141 to form the second refracted light. The second reflected light propagates to the surface of the functional reflective layer 17 in contact with the air inside the vehicle, and forms the third refracted light to enter the vehicle, and finally enters the driver's eyes to form a secondary image of the head-up display image. It is understandable that the second reflected light will also be reflected again on the surface where the functional reflective layer 17 contacts the air inside the vehicle, and will continue to be reflected and refracted multiple times, eventually forming the fifth refracted light and the sixth refracted light that pass through the surface where the functional reflective layer 17 contacts the air inside the vehicle. However, since their intensity is already very weak, they will not affect the display quality of the main image of the head-up display image, so they are ignored in this application.

[0082] Please refer again Figure 2 and Figure 3 The head-up display glass 10 further comprises at least one secondary image elimination layer M. The secondary image elimination layer M at least covers the display area 13. The secondary image elimination layer M is located in the light-transmitting area 11. Along the thickness direction of the head-up display glass 10, the secondary image elimination layer M completely covers the display area 13. Figure 3 The solid line frame M in the figure is the outline of the secondary image elimination layer M, and the display area 13 is completely disposed in the secondary image elimination layer M. The area of ​​the display area 13 is less than or equal to the area of ​​the secondary image elimination layer M. The secondary image elimination layer M is used to change the surface roughness of the head-up display glass 10 so that the first refracted light is diffusely reflected by the secondary image elimination layer M to reduce the secondary image reflectivity of the head-up display image, thereby greatly improving the primary-to-secondary image reflectivity of the head-up display image. The shape of the secondary image elimination layer M and the number of the secondary image elimination layers M match the shape and number of the display area 13, respectively. The number of the secondary image elimination layers M can be as follows: Figure 3 The shape of the secondary image elimination layer M can be as follows: Figure 3 In other embodiments, the number of the secondary image elimination layers M can be set to two, three or even more according to the actual application requirements of the vehicle 1000, and the shape of the secondary image elimination layer M can also be a triangle, a circle or the like.

[0083] It should be noted that the shape of the secondary image elimination layer M and the number of the secondary image elimination layers M can be set according to the actual application requirements of the vehicle 1000, and are not limited to the following. Figure 3The shape and number of the secondary image elimination layers M are shown. When the number of the secondary image elimination layers M is greater than or equal to two, the total area of ​​the secondary image elimination layers M is equal to the sum of the areas of all the secondary image elimination layers M.

[0084] The secondary image elimination layer M may be disposed on the first surface 141 of the outer glass plate 14, and / or on the second surface 142 of the outer glass plate 14, and / or on the fourth surface 162 of the inner glass plate 16, and / or on the third surface 161 of the inner glass plate 16. The secondary image elimination layer M and the functional reflection layer 17 are not located on the same surface. Along the thickness direction of the head-up display glass 10, the functional reflection layer 17 at least covers the secondary image elimination layer M. That is, the orthographic projection of the secondary image elimination layer M in the thickness direction of the head-up display glass 10 is completely located in the functional reflection layer 17. In this embodiment, as shown in FIG. Figure 2 As shown, the secondary image elimination layer M is provided on the first surface 141 of the outer glass plate 14. The secondary image elimination layer M is farther from the fourth surface 162 of the inner glass plate 6 than the functional reflection layer 17. The surface roughness of the secondary image elimination layer M is greater than or equal to 11 nm. The secondary image elimination layer M causes the first refracted light to be diffusely reflected on the first surface 141 to reduce the intensity of the second reflected light formed by the reflection of the first refracted light, thereby reducing the intensity of the third refracted light formed after the refraction of the second reflected light, and therefore, the intensity of the secondary image of the head-up display image formed by the third refracted light is reduced. It can be understood that the secondary image elimination layer M is used to reduce the secondary image reflectivity of the head-up display image of the HUD imaging and improve the main-to-secondary image reflectivity of the head-up display image of the HUD imaging. Among them, the main-to-secondary image reflectivity of the head-up display image is equal to the ratio of the main image reflectivity of the head-up display image to the secondary image reflectivity of the head-up display image. The main image reflectivity of the head-up display image is expressed as the ratio between the luminous flux of the first reflected light and the luminous flux of the projection light a when the projection light a is incident on the head-up display glass 10. The secondary image reflectivity of the head-up display image is expressed as the ratio between the luminous flux of the third refracted light and the luminous flux of the projection light a.

[0085] Among them, as the incident angle θ of the projection light a incident on the head-up display glass 10 increases to the Brewster angle, especially after the incident angle θ is greater than 65°, the increase in the reflectivity of the secondary image of the head-up display image is greater than the increase in the reflectivity of the main image of the head-up display image, thereby greatly reducing the reflectivity ratio of the main image to the secondary image of the head-up display image, so that the head-up display system with a high incident angle or a large field of view FOV still cannot eliminate the ghosting problem when used. The present application can reduce the reflectivity of the secondary image of the head-up display image formed by the third refracted light through the secondary image elimination layer M, thereby greatly improving the reflectivity ratio of the main image to the secondary image of the head-up display image, avoiding the interference of the secondary image of the head-up display image on the main image, so that the driver's eyes mainly observe the main image formed by the first reflected light, and achieve the effect of eliminating ghosting.

[0086] In this embodiment, during the process of forming the head-up display glass 10, the first surface 141 of the outer glass plate 14 is processed by an etching removal process such as an ion source process, a high power impulse magnetron sputtering process (HIPIMS) or a chemical etching process to obtain the outer glass plate 14 having the secondary image elimination layer M. It should be noted that the etching removal process such as the ion source process, the high power impulse magnetron sputtering process or the chemical etching process is helpful to improve the surface roughness of the local area of ​​the first surface 141 of the outer glass plate 14, thereby controlling the transmittance and reflectivity of the light, such as being used to reduce the reflectivity of the first surface 141 to the first refracted light in the head-up display system 100.

[0087] The ion source process generates plasma through an ion source, and uses the plasma to bombard the first surface 141 of the outer glass plate 14 to change the microstructure of the first surface 141. The ion source process can make a part of the first surface 141 have a certain surface roughness to obtain the secondary image elimination layer M.

[0088] In the high-power pulsed magnetron sputtering process, a HiPIMS power source can be used to supply instantaneous high power of several hundred kilowatts or even megawatts in a short pulse, and process gases argon (Ar) and oxygen (O2) are used to bombard the first surface 141 of the outer glass plate 14 to change the microstructure of the first surface 141. The high-power pulsed magnetron sputtering process can make a part of the first surface 141 have a certain surface roughness to obtain the secondary image elimination layer M.

[0089] In the chemical etching process, due to the characteristics of the chemical solvent, the chemical solvent will process the first surface 141 and the second surface 142 of the outer glass plate 14. Therefore, when the chemical etching process processes the outer glass plate 14, it is necessary to use a patterned photoresist as a mask, and the photoresist is covered on the first surface 141 and the second surface 142 of the outer glass plate 14, so that the photoresist shields the first surface 141 and the second surface 142 where no etching is required to form the secondary image elimination layer M, and exposes the first surface 141 and / or the second surface 142 where etching is required to form the secondary image elimination layer M. The chemical solvent contacts the first surface 141 and the second surface 142 where the photoresist is exposed, and increases the surface roughness of a part of the first surface 141 and a part of the second surface 142. The photoresist material is selected from at least one of AZ 5214E, AZ 1512, AZ 1518, SU-8, SPR 220-3.0, SPR 220-7.0, S1813, S1805, etc. The chemical solvent may be, but is not limited to, buffered hydrofluoric acid (main component is HF, and the buffer component is at least one of HCl, HNO3, H2SO4, NH4F). It can be understood that the two surfaces of the glass plate in the thickness direction are processed by chemical etching process, and the secondary image elimination layer M is formed by etching and removing part of the glass material in the thickness direction of the glass plate.

[0090] Comparative Examples 1-2 and Examples 1-3

[0091] This embodiment uses Figure 2 Taking the head-up display glass 10 shown as an example, the secondary image elimination layer M is processed by an ion source process to form the first surface 141 of the outer glass plate 14, and the functional reflective layer 17 is arranged on the fourth surface 162 of the inner glass plate 16. By selecting different surface roughnesses of the secondary image elimination layer M for testing, the visible light transmittance of the display area 13 of the head-up display glass 10, the main image reflectivity Rp1, the secondary image reflectivity Rp2 and the image quality of the head-up display image of the HUD imaging are recorded in Table 1, and by determining the main image reflectivity Rp1, the secondary image reflectivity Rp2, the main-to-secondary image reflectivity and the image quality of the head-up display image, it is determined whether the head-up display image formed by the head-up display glass 10 forms a double image.

[0092] The projection device 20 emits a projection light a with a wavelength in the range of 380 nm to 780 nm, and the projection light a contains at least 99% of P polarized light.

[0093] Surface roughness: Measured using a commercially available step profiler.

[0094] Visible light transmittance: measured and calculated using a spectrophotometer according to standard ISO9050.

[0095] The main image reflectance Rp1 of the head-up display image is measured and calculated using a spectrophotometer according to standard ISO9050. Rp10 (55°), Rp20 (60°), Rp30 (65°), Rp40 (70°), and Rp50 (75°) are the main image reflectances when the incident angle θ = 55°, 60°, 65°, 70°, and 75°, respectively.

[0096] Secondary image reflectance Rp2 of the head-up display image: measured and calculated using a spectrophotometer according to standard ISO9050. Rp11 (55°), Rp21 (60°), Rp31 (65°), Rp41 (70°), and Rp51 (75°) are the secondary image reflectances when the incident angle θ = 55°, 60°, 65°, 70°, and 75°, respectively.

[0097] The main-to-secondary image reflectance ratio of the head-up display image is equal to the ratio between the main image reflectivity Rp1 and the secondary image reflectivity Rp2, that is, the main-to-secondary image reflectance ratio = Rp1 / Rp2.

[0098] Image quality: The image quality is expressed as the standard of whether the driver observes a secondary image of the head-up display image when observing the HUD imaging in a dark environment and whether it causes ghosting.

[0099] Table 1: Test results of the head-up display glass 10 of Comparative Examples 1-2 and Examples 1-3

[0100]

[0101]

[0102] From Table 1, we can see that;

[0103] Comparative Example 1 is the head-up display glass 10 in the first embodiment of the head-up display system 100, and Comparative Example 2 is the head-up display glass 10 treated by the ion source process (i.e., the head-up display glass 10 in the second embodiment of the head-up display system 100). Therefore, the comparative example 1 does not have the secondary image elimination layer M, and the comparative example 2 is provided with the secondary image elimination layer M, and the secondary image elimination layer M is provided on the first surface 141 of the outer glass plate 14.

[0104] Comparative Example 1 does not have the secondary image elimination layer M, the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 80%, and the surface roughness of the first surface 141 of the outer glass plate 14 that has not been processed by the etching removal process is 7.2 nm. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 70°, the main image reflectivity of the head-up display image is Rp1 ≥ 10%, or Rp1 ≥ 15%, or Rp1 ≥ 20%; the secondary image reflectivity of the head-up display image is Rp2 ≤ 1%, or Rp2 ≤ 0.5%, or Rp2 ≤ 0.1%; the main and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11 ≥ 300, Rp20 / Rp21 ≥ 100, and Rp30 / Rp31 ≥ 15, but Rp40 / Rp41 is less than 7.5, that is, although the head-up display glass 10 of Comparative Example 1 can meet the use requirements of the incident angle θ of 55° to 65°, it cannot meet the use requirements of the incident angle above 70°.

[0105] Comparative Example 2 has a secondary image elimination layer M, but the surface roughness of the secondary image elimination layer M is less than 11 nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 80%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 70°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥120, and Rp30 / Rp31≥16, but Rp40 / Rp41 is still less than 7.5, that is, although the head-up display glass 10 of Comparative Example 2 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 65°, it still cannot meet the use requirements of incident angles above 70°.

[0106] Embodiment 1 has a secondary image elimination layer M, and the surface roughness of the secondary image elimination layer M is greater than 11 nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 80%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 70°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥400, Rp30 / Rp31≥20, and Rp40 / Rp41 is greater than 7.5, that is, the head-up display glass 10 of embodiment 1 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 70°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 65°, and can meet the use requirements of an incident angle of 70°.

[0107] Embodiment 2 has a secondary image elimination layer M, and the surface roughness of the secondary image elimination layer M is greater than 15 nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 80%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 70°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥1200, Rp30 / Rp31≥25, and Rp40 / Rp41≥8, that is, the head-up display glass 10 of embodiment 2 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 70°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 65°, and can better meet the use requirements of an incident angle of 70°.

[0108] Embodiment 3 has a secondary image elimination layer M, and the surface roughness of the secondary image elimination layer M is greater than 25 nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 75%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 70°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥1200, Rp30 / Rp31≥30, and Rp40 / Rp41≥10, that is, the head-up display glass 10 of embodiment 3 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 70°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 65°, and can well meet the use requirements of an incident angle of 70°.

[0109] Embodiment 4-7

[0110] In order to further verify the influence of the surface roughness of the secondary image elimination layer M on the secondary image reflectivity Rp2 and the image quality of the head-up display image, on the basis of the above test, the surface roughness of the secondary image elimination layer M is further changed for testing, and the obtained visible light transmittance of the display area 13 of the head-up display glass 10, the main image reflectivity Rp1, the secondary image reflectivity Rp2, the main-to-secondary image reflectance ratio and the image quality of the head-up display image of the HUD imaging are recorded in Table 2.

[0111] Table 2: Test results of head-up display glass 10 of Examples 4-7

[0112]

[0113]

[0114] From Table 2, we can see that:

[0115] Embodiment 4 has a secondary image elimination layer M, and the surface roughness of the secondary image elimination layer M is greater than 30nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 75%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 70°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥1200, Rp30 / Rp31≥50, and Rp40 / Rp41≥10, that is, the head-up display glass 10 of embodiment 4 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 70°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 65°, and can well meet the use requirements of an incident angle of 70°.

[0116] Embodiment 5 has a secondary image elimination layer M, and the surface roughness of the secondary image elimination layer M is greater than 40nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 75%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 75°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥1200, Rp30 / Rp31≥120, and Rp40 / Rp41≥20, and even Rp50 / Rp51≥8, that is, the head-up display glass 10 of embodiment 5 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 75°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 70°, and can well meet the use requirements of an incident angle of 75°.

[0117] Embodiment 6 has a secondary image elimination layer M, and the surface roughness of the secondary image elimination layer M is greater than 60nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 70%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 75°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥1200, Rp30 / Rp31≥1500, and Rp40 / Rp41≥50, and even Rp50 / Rp51≥10, that is, the head-up display glass 10 of embodiment 6 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 75°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 70°, and can well meet the use requirements of an incident angle of 75°.

[0118] Embodiment 7 has a secondary image elimination layer M, and the surface roughness of the secondary image elimination layer M is greater than 70nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 70%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 75°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥1200, Rp30 / Rp31≥1500, and Rp40 / Rp41≥90, and even Rp50 / Rp51≥13, that is, the head-up display glass 10 of embodiment 7 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 75°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 70°, and can well meet the use requirements of an incident angle of 75°.

[0119] Embodiment 8-9

[0120] Furthermore, based on the above test, different etching and removal processes of the secondary image elimination layer M are selected for testing, and the obtained visible light transmittance of the display area 13 of the head-up display glass 10, the main image reflectivity Rp1, the secondary image reflectivity Rp2, the main-to-secondary image reflectance ratio and the image quality of the head-up display image of the HUD imaging are recorded in Table 3.

[0121] Table 3: Test results of the head-up display glass 10 of Examples 8-9

[0122]

[0123] From Table 3, we can see that:

[0124] Embodiment 8 has a secondary image elimination layer M, and a high-power pulsed magnetron sputtering process is used to make the surface roughness of the secondary image elimination layer M greater than 55nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 75%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 75°, the secondary image reflectivity of the head-up display image is reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥1200, Rp30 / Rp31≥500, and Rp40 / Rp41≥30, and even Rp50 / Rp51≥9, that is, the head-up display glass 10 of embodiment 8 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 75°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 70°, and can well meet the use requirements of an incident angle of 75°.

[0125] Embodiment 9 has a secondary image elimination layer M, and a chemical etching process is used to form the secondary image elimination layer M on both the first surface 141 and the second surface 142. The surface roughness of the secondary image elimination layer M is greater than 55 nm, and the visible light transmittance of the display area 13 of the head-up display glass 10 is greater than or equal to 70%. When the projection light a is incident on the head-up display glass 10 at an incident angle θ of 55° to 75°, the reflectivity of the secondary image of the head-up display image is greatly reduced, so that the primary and secondary image reflectance ratios of the head-up display image are Rp10 / Rp11≥1000, Rp20 / Rp21≥1200, Rp30 / Rp31≥1500, and Rp40 / Rp41≥600, and even Rp50 / Rp51≥11, that is, the head-up display glass 10 of Example 9 can improve the primary and secondary image reflectance ratios at an incident angle θ of 55° to 75°, especially greatly improve the primary and secondary image reflectance ratios at an incident angle θ of 60° to 70°, and can well meet the use requirements of an incident angle of 75°.

[0126] It should be noted that in Examples 1-9, Rp10 / Rp11 is equal to 1017, which does not mean that Rp10 / Rp11 remains unchanged as the surface roughness of the secondary image elimination layer changes. It is only based on the measurement accuracy and measurement error of Rp11 (55°), and this application does not provide a more accurate description. Similarly, when Rp21 (60°) and Rp31 (65°) are less than or equal to 0.01%, based on the measurement accuracy and measurement error, this application does not provide a more accurate description.

[0127] It can be seen from Table 1, Table 2 and Table 3 that the surface roughness of the secondary image elimination layer M is greater than or equal to 11 nm. Exemplarily, the surface roughness of the secondary image elimination layer M is greater than or equal to 15 nm and less than or equal to 100 nm. Preferably, the surface roughness of the secondary image elimination layer M is greater than or equal to 35 nm and less than or equal to 75 nm.

[0128] The functional reflective layer 17 has a first main image reflectivity Rp10 for P polarized light incident on the head-up display glass at an incident angle θ of 55°, that is, the first main image reflectivity Rp10 of the head-up display image of the HUD imaging is greater than or equal to 10%, and the secondary image elimination layer M has a first secondary image reflectivity Rp11 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 55°, that is, the first secondary image reflectivity Rp11 of the head-up display image of the HUD imaging is less than or equal to 0.01%. The main and secondary image reflectance ratios Rp10 / Rp11 of the head-up display image are ≥1000, which can meet the use requirements of the 55° incident angle, so that the head-up display image at the 55° incident angle is clear without visual double images.

[0129] The functional reflective layer 17 has a second main image reflectivity Rp20 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 60°, that is, the second main image reflectivity Rp20 of the head-up display image of the HUD imaging is greater than or equal to 12%, and the secondary image elimination layer M has a second secondary image reflectivity Rp21 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 60°, that is, the second secondary image reflectivity Rp21 of the head-up display image of the HUD imaging is less than or equal to 0.05%, preferably less than or equal to 0.03%, and more preferably less than or equal to 0.01%. The main and secondary image reflectance ratios of the head-up display image Rp20 / Rp21≥400, or Rp20 / Rp21≥800, or Rp20 / Rp21≥1000, or Rp20 / Rp21≥1200 can meet the use requirements of the 60° incident angle, so that the head-up display image at the 60° incident angle is clear without visual double images.

[0130] The functional reflective layer 17 has a third main image reflectivity Rp30 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 65°, that is, the third main image reflectivity Rp30 of the head-up display image imaged by the HUD is greater than or equal to 15%, and the secondary image elimination layer M has a third secondary image reflectivity Rp31 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 65°, that is, the third secondary image reflectivity Rp31 of the head-up display image imaged by the HUD is less than or equal to 0.8%, preferably less than or equal to 0.5%, or preferably less than or equal to 0.3%, or preferably less than or equal to 0.1%, or preferably less than or equal to 0.05%, or preferably less than or equal to 0.03%, or preferably less than or equal to 0.01%. The primary and secondary image reflectance ratios of the head-up display image are Rp30 / Rp31≥20, or Rp30 / Rp31≥50, or Rp30 / Rp31≥100, or Rp30 / Rp31≥300, or Rp30 / Rp31≥500, or Rp30 / Rp31≥800, or Rp30 / Rp31≥1000, or Rp30 / Rp31≥1500, which can meet the use requirements of an incident angle of 65°, so that the head-up display image at an incident angle of 65° is clear without visual ghosting.

[0131] The functional reflective layer 17 has a fourth main image reflectivity Rp40 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 70°, that is, the fourth main image reflectivity Rp40 of the head-up display image imaged by the HUD is greater than or equal to 20%, and the secondary image elimination layer M has a fourth secondary image reflectivity Rp41 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 70°, that is, the fourth secondary image reflectivity Rp41 of the head-up display image imaged by the HUD is less than or equal to 2.7%, preferably less than or equal to 2.5%, or preferably less than or equal to 2%, or preferably less than or equal to 1.5%, or preferably less than or equal to 1%, or preferably less than or equal to 0.5%, or preferably less than or equal to 0.1%. The primary and secondary image reflectance ratios of the head-up display image are Rp40 / Rp41≥7.5, or Rp40 / Rp41≥8, or Rp40 / Rp41≥10, or Rp40 / Rp41≥20, or Rp40 / Rp41≥30, or Rp40 / Rp41≥50, or Rp40 / Rp41≥90, or Rp40 / Rp41≥100, or Rp40 / Rp41≥500, which can meet the use requirements of an incident angle of 70°, so that the head-up display image at an incident angle of 70° is clear without visual ghosting.

[0132] The functional reflective layer 17 has a fifth main image reflectivity Rp50 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 75°, that is, the fifth main image reflectivity Rp50 of the head-up display image of the HUD imaging is greater than or equal to 28%, and the secondary image elimination layer M has a fifth secondary image reflectivity Rp51 for P polarized light incident on the head-up display glass 10 at an incident angle θ of 75°, that is, the fifth secondary image reflectivity Rp51 of the head-up display image of the HUD imaging is less than or equal to 3.6%, preferably less than or equal to 3%, or preferably less than or equal to 2.5%. The main and secondary image reflectance ratios of the head-up display image Rp50 / Rp51≥8, or Rp50 / Rp51≥9, or Rp50 / Rp51≥10 can meet the use requirements of the 75° incident angle, so that the head-up display image at the 75° incident angle is clear without visual double images.

[0133] Therefore, it can be understood that the head-up display glass 10 with the secondary image elimination layer M can reduce the secondary image reflectivity Rp2 of the head-up display image of the HUD imaging, so that there is no double image when the driver observes the HUD imaging.

[0134] It should be noted that the secondary image elimination layer M may also be disposed on the third surface 161 and / or the fourth surface 162 of the inner glass plate 16 , and the secondary image elimination layer M is formed by etching and removing part of the glass material in the thickness direction of the inner glass plate 16 .

[0135] See also Figure 4 , Figure 4A cross-sectional schematic diagram of a second embodiment of the head-up display system provided by the present application. Figure 2 The embodiment shown is different in that the functional reflective layer 17 in the head-up display glass 10 is deposited on the third surface 161 of the inner glass plate 16. The projection device 20 emits a projection light a to the head-up display glass 10, and the projection light a is directly incident on the fourth surface 162. On the surface of the fourth surface 162 in contact with the air in the vehicle, part of the projection light a is directly reflected by the fourth surface 162 to form a first reflected light, and another part of the projection light a forms a first refracted light. The first reflected light enters the driver's eyes to form a first secondary image of the head-up display image; the first refracted light enters the inner glass plate 16 and propagates to the functional reflective layer 17. Part of the first refracted light is reflected by the functional reflective layer 17 to form a second reflected light, and another part of the first refracted light passes through the functional reflective layer 17, the intermediate layer 15 and the outer glass plate 14 and propagates to the first surface 141, the second reflected light propagates to the fourth surface 162 and forms a second refracted light on the surface of the fourth surface 162 that contacts the air inside the vehicle, the second refracted light enters the vehicle, and finally enters the driver's eyes to form a main image of the head-up display image; part of the first refracted light propagated to the first surface 141 is reflected by the first surface 141 to form a third reflected light, the third reflected light passes through the outer glass plate 14, the middle layer 15, the functional reflective layer 17, and the inner glass plate 16 to propagate to the fourth surface 162, and forms a third refracted light on the surface of the fourth surface 162 that contacts the air inside the vehicle, the third refracted light enters the vehicle, and finally enters the driver's eyes to form a second secondary image of the head-up display image.

[0136] exist Figure 4 In the embodiment, the secondary image elimination layer M is located on the first surface 141, and can reduce the reflectivity of the second secondary image of the head-up display image, so that when the driver observes the head-up display image, no ghosting caused by the second secondary image occurs.

[0137] See also Figure 5 , Figure 5 A cross-sectional schematic diagram of a third embodiment of the head-up display system provided by the present application. Figure 4 The embodiment shown is different in that the number of the secondary image elimination layers M is two. The processing processes of the two secondary image elimination layers M can be the same or different. The orthographic projections of the two secondary image elimination layers M in the thickness direction of the head-up display glass 10 completely overlap. One secondary image elimination layer M is provided on the first surface 141 of the outer glass plate 14 in the head-up display glass 10, and the other secondary image elimination layer M is provided on the fourth surface 162 of the inner glass plate 16 in the head-up display glass 10. The secondary image elimination layer M provided on the first surface 141 can reduce the reflectivity of the second secondary image of the head-up display image, and the secondary image elimination layer M provided on the fourth surface 162 can reduce the reflectivity of the first secondary image of the head-up display image, so that when the driver observes the head-up display image, there is neither a ghost image caused by the first secondary image nor a ghost image caused by the second secondary image.

[0138] See also Figure 6 , Figure 6 A schematic cross-sectional view of a fourth embodiment of the head-up display system provided in the present application.

[0139] and Figure 4 The embodiment shown is different in that the functional reflective layer 17 of the head-up display glass 10 is deposited on the second surface 142 of the outer glass plate 14, and the secondary image elimination layer M is disposed on the fourth surface 162 of the inner glass plate 16 in the head-up display glass 10. The secondary image elimination layer M disposed on the fourth surface 162 can reduce the reflectivity of the first secondary image of the head-up display image, so that when the driver observes the head-up display image, no double image caused by the first secondary image appears.

[0140] Furthermore, the head-up display glass 10 further includes a second shielding layer 19. The second shielding layer 19 is located in the shielding area 12. The second shielding layer 19 covers the fourth surface 162 of the inner glass plate 16 and is arranged around the edge of the fourth surface 162. The orthographic projection of the second shielding layer 19 in the thickness direction of the head-up display glass 10 at least partially overlaps with the orthographic projection of the first shielding layer 18 in the thickness direction of the head-up display glass 10. The second shielding layer 19 is used to increase the shielding effect in the head-up display glass 10. Among them, the structure and material of the second shielding layer 19 are similar to those of the first shielding layer 18.

[0141] In some other embodiments, the head-up display glass 10 further includes a heat insulation layer (not shown). The heat insulation layer and the secondary image elimination layer M are not located on the same surface, for example, the secondary image elimination layer M is located on the first surface 141 and the heat insulation layer is located on the second surface 142, the third surface 161 or the fourth surface 162, and for another example, the secondary image elimination layer M is located on the fourth surface 162 and the heat insulation layer is located on the second surface 142 or the third surface 161.

[0142] Of course, the heat insulation layer and the secondary image elimination layer M can also be located on the same surface, and there is no heat insulation layer in the area where the secondary image elimination layer M is located. It can be understood that first, the heat insulation layer is formed on the surface of the outer glass plate 14 and / or the inner glass plate 16, and then, a part of the heat insulation layer and the glass material are removed by an etching removal process to form the secondary image elimination layer M. The heat insulation layer is selected from at least one of a single silver nano coating, a double silver nano coating, a triple silver nano coating, a quadruple silver nano coating, an ITO nano coating, a FTO nano coating, and an infrared blocking micro coating. The total solar transmittance of the head-up display glass 10 with a heat insulation layer is less than or equal to 55%.

[0143] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A head-up display glass, characterized in that: The head-up display glass comprises an outer glass plate, an inner glass plate, and an intermediate layer sandwiched between the outer glass plate and the inner glass plate, the outer glass plate comprises a first surface and a second surface, the first surface and the second surface are arranged opposite to each other along the thickness direction of the outer glass plate, the inner glass plate comprises a third surface and a fourth surface, the third surface and the fourth surface are arranged opposite to each other along the thickness direction of the inner glass plate, and the intermediate layer is connected to the second surface and the third surface; The head-up display glass has a display area, and the display area is used to reflect the projection light to form a head-up display image; The head-up display glass further includes a functional reflective layer and a secondary image elimination layer, wherein the functional reflective layer has a reflectivity of at least 10% for P-polarized light incident at an incident angle of 55°, the surface roughness of the secondary image elimination layer is greater than or equal to 11 nm, and the functional reflective layer and the secondary image elimination layer are not located on the same surface; Along the thickness direction of the head-up display glass, the functional reflective layer at least covers the secondary image elimination layer, and the secondary image elimination layer at least covers the display area.

2. The head-up display glass according to claim 1, characterized in that: The secondary image elimination layer is disposed on the first surface, and / or the second surface, and / or the third surface, and / or the fourth surface; The functional reflective layer is disposed on the second surface, and / or the third surface, and / or the fourth surface, and / or in the intermediate layer.

3. The head-up display glass according to claim 1, characterized in that: The head-up display glass includes a light-transmitting area and a shielding area, the visible light transmittance of the light-transmitting area is greater than or equal to 70%, the visible light transmittance of the shielding area is less than or equal to 5%, the visible light transmittance of the display area is greater than or equal to 70%, the display area is located in the light-transmitting area, and the functional reflective layer at least covers the light-transmitting area.

4. The head-up display glass according to claim 1, characterized in that: The functional reflective layer is closer to the fourth surface than the secondary image eliminating layer.

5. The head-up display glass according to claim 1, characterized in that: The number of the secondary image elimination layers is two, and the secondary image elimination layers are arranged on the first surface and the fourth surface.

6. The head-up display glass according to claim 1, characterized in that: The number of the secondary image elimination layer is only one, and the secondary image elimination layer is disposed on the first surface or the fourth surface.

7. The head-up display glass according to claim 1, characterized in that: The secondary image elimination layer is disposed on the first surface and / or the second surface, and the secondary image elimination layer is formed by etching and removing a portion of glass material in a thickness direction of the outer glass plate.

8. The head-up display glass according to claim 1, characterized in that: The secondary image elimination layer is disposed on the third surface and / or the fourth surface, and the secondary image elimination layer is formed by etching and removing a portion of glass material in a thickness direction of the inner glass plate.

9. The head-up display glass according to claim 1, characterized in that: The etching removal process is an ion source process, a high-power pulsed magnetron sputtering process or a chemical etching process.

10. The head-up display glass according to claim 1, characterized in that: The surface roughness of the secondary image eliminating layer is greater than or equal to 15 nm and less than or equal to 100 nm.

11. The head-up display glass according to claim 1, characterized in that: The surface roughness of the secondary image elimination layer is greater than or equal to 35 nm and less than or equal to 75 nm.

12. The head-up display glass according to claim 1, characterized in that: The functional reflective layer is selected from at least one of a high-low refractive index stack, a metal stack, a holographic film and a stacked polymer film.

13. The head-up display glass according to claim 1, characterized in that: The head-up display glass also includes a heat insulation layer, which is selected from at least one of a single silver nano-coating, a double silver nano-coating, a triple silver nano-coating, a quadruple silver nano-coating, an ITO nano-coating, a FTO nano-coating, and an infrared blocking micro-coating. The head-up display glass having the heat insulation layer has a total solar energy transmittance less than or equal to 55%.

14. The head-up display glass according to claim 12, characterized in that: The secondary image eliminating layer and the heat insulating layer are located on the same surface, and the heat insulating layer does not exist in the area where the secondary image eliminating layer is located.

15. A head-up display system, characterized in that: The head-up display system comprises a projection device and the head-up display glass according to any one of claims 1 to 14, wherein the projection device is located on one side of the inner glass plate and emits projection light to the display area of ​​the head-up display glass, wherein the projection light contains at least 80% of P-polarized light; The functional reflection layer reflects the incident projection light to form a main image of the head-up display image, and the secondary image elimination layer diffusely reflects the incident projection light to form a secondary image of the head-up display image; The functional reflection layer has a first main image reflectivity Rp10 for P polarized light incident at an incident angle of 55°, Rp10 ≥ 10%; The secondary image eliminating layer has a first secondary image reflectivity Rp11 for P polarized light incident at an incident angle of 55°, and Rp11≤0.01%.

16. The head-up display system according to claim 15, characterized in that: The functional reflection layer has a second main image reflectivity Rp20 for P polarized light incident at an incident angle of 60°, and Rp20 is ≥ 12%; The secondary image eliminating layer has a second secondary image reflectivity Rp21 for P polarized light incident at an incident angle of 60°, and Rp21≤0.05%.

17. The head-up display system according to claim 15, characterized in that: The functional reflection layer has a third main image reflectivity Rp30 for P polarized light incident at an incident angle of 65°, and Rp30 is ≥ 15%; The secondary image eliminating layer has a third secondary image reflectivity Rp31 for P polarized light incident at an incident angle of 65°, and Rp31≤0.8%.

18. The head-up display system according to claim 15, characterized in that: The functional reflection layer has a fourth main image reflectivity Rp40 for P polarized light incident at an incident angle of 70°, and Rp40 is ≥ 20%; The secondary image eliminating layer has a fourth secondary image reflectivity Rp41 for P polarized light incident at an incident angle of 70°, and Rp41≤2.5%.

19. The head-up display system according to claim 15, characterized in that: The functional reflection layer has a fifth main image reflectivity Rp50 for P polarized light incident at an incident angle of 75°, and Rp50 is ≥ 28%; The secondary image eliminating layer has a fifth secondary image reflectivity Rp51 for P polarized light incident at an incident angle of 75°, and Rp51≤4%.

20. A vehicle, characterized in that: The vehicle includes a vehicle body and a head-up display system as described in any one of claims 15 to 19, wherein the head-up display system is installed at an opening of the vehicle body, and the projection device is installed inside the vehicle body.

Images