Head-up display glass and head-up display system

Abstract

Provided in the present application are head-up display (HUD) glass and an HUD system. The HUD glass comprises laminated glass and a transparent nano-film, wherein the transparent nano-film can reflect P-polarized light. In the present application, by means of using a SiZrOx layer or a SiZrMoY layer as the outermost protective layer of a transparent nano film, a lower refractive index is maintained, and the hardness and extinction coefficient of the film layer are improved, such that the transparent nano film maintains a higher reflectivity on P-polarized light to ensure the high quality of HUD images and adapt to the exposed use environment in vehicles, and also makes the reflection spectrum of the transparent nano film for the P-polarized light smoother, which is conducive to realizing the neutral color display of the HUD images.

Description

Head-up display glass and head-up display system

[0001] Cross-reference information

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on November 3, 2023, with application number 202311457600.6 and invention name “Head-up display glass and head-up display system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of automotive glass, and specifically provides a head-up display glass and a head-up display system. Background Art

[0004] A head-up display (HUD) is a driver-centric, blind-operated, multi-functional instrument panel. Its function is to project important driving information, such as speed and navigation, onto the windshield in front of the driver, allowing the driver to see these vital information without looking away from the road ahead, thus improving driving safety.

[0005] Conventional HUD projection devices project primarily S-polarized light onto the windshield. This S-polarized light reflects off both the interior and exterior surfaces of the windshield, producing a primary image for the HUD display and a secondary image that acts as a ghost. To mitigate or eliminate the secondary image, a wedge-shaped PVB can be used as an intermediate bonding layer on the windshield, allowing the secondary image to overlap with the primary image.

[0006] With technological advancements, HUD projection devices that primarily emit P-polarized light can be used. In conjunction with Brewster's law, glass essentially reflects no P-polarized light incident at the Brewster angle. Therefore, providing a P-polarized light-enhancing reflection coating on the windshield can produce the primary image displayed by the HUD without generating a secondary image. For example, Chinese patent CN116568501A discloses a composite glass panel for a head-up display system with P-polarized radiation. A second coating is provided on the second surface (i.e., the interior surface) of the second glass panel (i.e., the inner glass panel) facing away from the middle layer. The P-polarized radiation is used to generate the HUD image. The second coating comprises a first layer of a dielectric material having a refractive index greater than or equal to 1.6 and a second layer of a dielectric material having a refractive index less than or equal to 1.6. The second layer is exposed inside the vehicle and comprises a dielectric material based on silicon oxide (SiO2). The SiO2 film layer has a low surface hardness, making the second coating easily scratched by fine sand or other hard components, thereby affecting the overall appearance of the windshield and even reducing the quality of the HUD image.

[0007] Summary of the Invention

[0008] In order to solve the above technical problems, the purpose of this application is to provide a head-up display glass and a head-up display system. The head-up display glass can improve the surface hardness of the P-polarized light enhanced reflective coating without reducing the HUD image quality, so that the P-polarized light enhanced reflective coating can better adapt to the exposed use environment in the car.

[0009] To achieve the above-mentioned object, the present application provides a head-up display glass, characterized in that the head-up display glass comprises:

[0010] Laminated glass, comprising an outer glass pane, an inner glass pane, and a thermoplastic interlayer disposed between the outer glass pane and the inner glass pane, wherein the outer glass pane comprises a first surface and a second surface opposite to each other, the inner glass pane comprises a third surface and a fourth surface opposite to each other, and the thermoplastic interlayer is disposed between the second surface and the third surface; and

[0011] a transparent nanofilm disposed on the fourth surface, capable of reflecting P-polarized light, comprising an outermost protective layer farthest from the fourth surface, the outermost protective layer being a SiZrOx layer or a SiZrMOy layer, wherein x satisfies 1<x<3, y satisfies 1<y<3, and M is selected from one or a combination of two or more of W, Nb, Ta, Y, Hf, and Al;

[0012] The refractive index n of the outermost protective layer is 1.50-1.60, and the extinction coefficient k of the outermost protective layer is 0.00001-0.001.

[0013] In some embodiments, the pencil hardness of the outermost protective layer is ≥9H.

[0014] In some embodiments, the outermost protective layer has a physical thickness of 30 nm to 120 nm.

[0015] In some embodiments, the outermost protective layer is formed by a magnetron sputtering process, and the sputtering target of the outermost protective layer is a SiZr alloy target or a SiZrM alloy target.

[0016] In some embodiments, the SiZr alloy target comprises 50%-70% Si and 30%-50% Zr, and the SiZrM alloy target comprises 50%-75% Si, 10%-40% Zr, and 0.1%-15% M, by mass percentage.

[0017] In some embodiments, M is selected from a combination of two or more of W, Nb, Ta, Y, Hf, and Al, and the mass ratio between the element with the highest content and the element with the lowest content in the combination is 1-2.

[0018] In some embodiments, the target power supply for the outermost protective layer is a high-power pulsed magnetron sputtering power supply, and the operating voltage of the magnetron sputtering outermost protective layer is 550V-1200V, the operating current is 200A-1000A, and the duty cycle is 5%-15%.

[0019] In some embodiments, the transparent nanofilm further includes at least one stacked structure, wherein the stacked structure is disposed between the fourth surface and the outermost protective layer, and each stacked structure includes a high refractive index layer and a low refractive index layer stacked in sequence, wherein the refractive index of the high refractive index layer is 1.61-2.75, and the refractive index of the low refractive index layer is 1.35-1.60.

[0020] In some embodiments, the high refractive index layer and the low refractive index layer are formed by a magnetron sputtering process, the target power supply of the low refractive index layer is a medium frequency magnetron sputtering power supply, and the duty cycle of magnetron sputtering of the low refractive index layer is 100%.

[0021] In some embodiments, the target power source of the high refractive index layer is a medium frequency magnetron sputtering power source, and the duty cycle of magnetron sputtering of the high refractive index layer is 100%.

[0022] In some embodiments, the target power source of at least one of the high refractive index layers is a high-power pulsed magnetron sputtering power source, and the duty cycle of magnetron sputtering of at least one of the high refractive index layers is 5%-15%.

[0023] In some embodiments, the outermost protective layer is in direct contact with the low refractive index layer in the nearest stacked structure, and the physical thickness of the outermost protective layer is 30 nm to 110 nm.

[0024] In some embodiments, the physical thickness of the low refractive index layer in the closest stacked structure is greater than the physical thickness of the outermost protective layer.

[0025] In some embodiments, an optical adjustment layer is further provided between the outermost protective layer and the low refractive index layer in the closest stacked structure, the refractive index of the optical adjustment layer is 2.10-2.75, and the physical thickness of the outermost protective layer is 60nm-120nm.

[0026] In some embodiments, the physical thickness of the outermost protective layer is greater than the thickness of the optical conditioning layer.

[0027] In some embodiments, the optical adjustment layer is formed by a magnetron sputtering process, the target power source of the optical adjustment layer is a high-power pulsed magnetron sputtering power source, and the duty cycle of magnetron sputtering of the optical adjustment layer is 5%-15%.

[0028] In some embodiments, at least one high refractive index layer includes at least two high refractive index sublayers, the refractive index of the high refractive index sublayer closest to the fourth surface is 1.61-2.10, and the refractive index of the high refractive index sublayer farthest from the fourth surface is 2.11-2.75.

[0029] In some embodiments, the reflectivity of the head-up display glass for P-polarized light with wavelengths of 629 nm, 529 nm, and 469 nm incident at an incident angle of 65° is R1, R2, and R3, respectively, where R1 is ≥19%, R2 is ≥19%, and R3 is ≥19%.

[0030] The present application also provides a head-up display system, which includes a projection device and the head-up display glass as described above, wherein the projection device is used to generate projection light containing P-polarized light, the proportion of P-polarized light in the projection light is greater than or equal to 80%, and the projection light is incident on the transparent nanofilm at an incident angle of 38° to 85°.

[0031] In the head-up display glass provided in the present application, a SiZrOx layer or a SiZrMOy layer is used as the outermost protective layer of the transparent nanofilm. Compared with the traditional SiO2 layer as the outermost layer of the transparent nanofilm, while maintaining a lower refractive index, the hardness and extinction coefficient of the film layer are improved. This not only enables the transparent nanofilm to maintain a high reflectivity for P-polarized light to ensure high brightness and high contrast of the HUD image, but also is more conducive to the exposed use of the transparent nanofilm on the surface inside the vehicle. It also unexpectedly makes the reflection spectrum of the transparent nanofilm for P-polarized light smoother, which is conducive to achieving neutral color display of the HUD image. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic structural diagram of the head-up display system provided in this application.

[0033] FIG2 is an enlarged cross-sectional schematic diagram of the first embodiment of the transparent nanofilm provided in this application.

[0034] FIG3 is an enlarged cross-sectional schematic diagram of a second embodiment of the transparent nanofilm provided in this application.

[0035] FIG4 is an enlarged cross-sectional schematic diagram of a third embodiment of the transparent nanofilm provided in this application.

[0036] FIG5 is an enlarged cross-sectional schematic diagram of a fourth embodiment of the transparent nanofilm provided in the present application.

[0037] FIG6 is an enlarged cross-sectional schematic diagram of the fifth embodiment of the transparent nanofilm provided in this application.

[0038] FIG7 is an enlarged cross-sectional schematic diagram of a sixth embodiment of the transparent nanofilm provided in the present application. DETAILED DESCRIPTION

[0039] In order to have a clearer understanding of the technical features, objectives and beneficial effects of the present application, the technical solution of the present application is now described in detail below, but it should not be understood as limiting the scope of implementation of the present application.

[0040] Unless otherwise specified or incompatible therewith, terms and phrases used in this application shall have the following meanings:

[0041] In this application, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features.

[0042] The values ​​of x, y, and t in the chemical formula: If clearly defined, they shall be within the defined ranges. If not clearly defined, they may be determined based on the stoichiometric, substoichiometric, or superstoichiometric deposition methods used in the magnetron sputtering process.

[0043] High-temperature heat treatment: high-temperature heat treatment of at least 500°C, such as the 550°C to 720°C deadweight bending process or press bending process for producing automotive glass.

[0044] Refractive index: The refractive index is the refractive index at a wavelength of 550nm.

[0045] As shown in Figure 1, the present application provides a head-up display system comprising a projection device 100 and a head-up display glass 200. The projection device 100 is configured to generate projection light 101 comprising P-polarized light, with the P-polarized light comprising greater than or equal to 80% of the projection light 101. The projection device 100 is mounted inside a vehicle, and the head-up display glass 200 is typically mounted on the vehicle at an installation angle of 18° to 45°. The installation angle is the angle between the head-up display glass 200 and the horizontal plane when the head-up display glass 200 is mounted on the vehicle, indicating the degree of inclination of the head-up display glass 200.

[0046] In order to realize the head-up display function, the head-up display glass 200 is provided with a transparent nanofilm 14 capable of reflecting P-polarized light. The projection light 101 generated by the projection device 100 is incident on the transparent nanofilm 14 at an incident angle of 38° to 85°. The transparent nanofilm 14 can reflect part of the projection light 101 to form a head-up display (HUD) image that is recognized by the driver's eyes. Compared with traditional head-up display glass that can only be used with S-polarized light projection light, the head-up display glass 200 and head-up display system provided in this application can meet the usage needs of drivers wearing sunglasses. The head-up display glass 200 has an exterior surface and an interior surface. When the head-up display glass 200 is installed on a vehicle, the exterior surface is the side exposed to the outside of the vehicle, and the interior surface is the side exposed to the inside of the vehicle. The transparent nanofilm 14 is provided on the interior surface.

[0047] The projection device 100 is used to output relevant text and image information such as speed, engine speed, fuel consumption, tire pressure, dynamic navigation, night vision, real-life map, etc. onto the head-up display glass 200, so that it can be observed by observers in the car, realizing a head-up display (HUD) or even an augmented reality head-up display (AR-HUD). The projection device 100 is an element known to those skilled in the art, including but not limited to lasers, light-emitting diodes (LEDs), liquid crystal displays (LCDs), digital light processing (DLPs), electroluminescence (EL), cathode ray tubes (CRTs), vacuum fluorescent tubes (VFDs), collimators, spherical correction lenses, convex lenses, concave lenses, reflectors and / or polarizers. At the same time, the position and incident angle of the projection device 100 are adjustable to suit observers at different positions or heights in the car.

[0048] In Figure 1 , the head-up display glass 200 includes laminated glass and a transparent nanofilm 14. The laminated glass comprises an outer glass pane 11, an inner glass pane 13, and a thermoplastic interlayer 12 disposed between the outer and inner glass panes. The outer glass pane 11 includes a first surface 111 and a second surface 112, which are opposed to each other. The inner glass pane 13 includes a third surface 131 and a fourth surface 132, which are opposed to each other. The thermoplastic interlayer 12 is disposed between the second surface 112 and the third surface 131. In this application, the transparent nanofilm 14 serves as a P-polarized light-enhancing reflective coating. Disposed on the fourth surface 132, the transparent nanofilm 14 reflects P-polarized light, thereby increasing the laminated glass's reflectivity for P-polarized light and achieving a ghost-free head-up display function.

[0049] As shown in Figures 2 to 7, the transparent nanofilm 14 provided in the present application includes an outermost protective layer 141 farthest from the fourth surface 132, and the outermost protective layer 141 is a SiZrOx layer or a SiZrMOy layer, wherein x satisfies 1<x<3, y satisfies 1<y<3, and M is selected from one or a combination of more than two of W, Nb, Ta, Y, Hf, and Al; the refractive index n of the outermost protective layer 141 is 1.50-1.60, and the extinction coefficient k of the outermost protective layer 141 is 0.00001-0.001. The present application adopts a SiZrOx layer or a SiZrMOy layer as the outermost protective layer 141 of the transparent nanofilm 14. Compared with the traditional SiO2 layer as the outermost layer of the transparent nanofilm 14, while maintaining a lower refractive index, the film hardness and extinction coefficient k are improved. This can not only enable the transparent nanofilm 14 to maintain a high reflectivity for P-polarized light to ensure high brightness and high contrast of the HUD image, but also be more conducive to the exposed use of the transparent nanofilm 14 on the surface inside the vehicle. It also unexpectedly makes the reflection spectrum of the transparent nanofilm 14 for P-polarized light smoother, which is conducive to achieving a neutral color display of the HUD image; and it also reduces the visible light reflectivity of the head-up display glass 200 to natural light inside the vehicle, which is conducive to improving the instrument panel reflection problem when the head-up display glass 200 is used as the front windshield.

[0050] In some embodiments, the pencil hardness of the outermost protective layer 141 is ≥9H, so as to facilitate the naked use of the transparent nanofilm 14 on the surface inside the vehicle.

[0051] In some embodiments, the outermost protective layer 141 has a physical thickness of 30 nm to 120 nm, and specific examples include 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm, 65 nm, 70 nm, 75 nm, 80 nm, 85 nm, 90 nm, 95 nm, 100 nm, 105 nm, 110 nm, 115 nm, and 120 nm. It is understood that if the physical thickness of the outermost protective layer 141 is less than 30 nm, it is not conducive to improving the hardness, wear resistance, and scratch resistance of the transparent nanofilm 14. If the physical thickness of the outermost protective layer 141 is greater than 120 nm, it is not conducive to controlling the production cost of the transparent nanofilm 14 and the neutral color display of the HUD image.

[0052] The transparent nanofilm 14 can be deposited layer by layer on the fourth surface 132 through a magnetron sputtering process. By optimizing the material and thickness of each layer of the transparent nanofilm 14, the transparent nanofilm 14 can withstand subsequent high-temperature heat treatment of at least 500°C and other bending forming processes, and the optical and mechanical properties of the obtained head-up display glass 200 can meet the use standards of vehicle glass.

[0053] Specifically, the outermost protective layer 141 is formed by a magnetron sputtering process. The sputtering target of the outermost protective layer 141 is a SiZr alloy target or a SiZrM alloy target. The SiZr alloy target can be sputtered and deposited in a process gas of Ar and O2 to form a SiZrOx layer, and the SiZrM alloy target can be sputtered and deposited in a process gas of Ar and O2 to form a SiZrMOy layer. Wherein, x satisfies 1<x<3, y satisfies 1<y<3, and M is selected from one or a combination of two or more of W (tungsten), Nb (niobium), Ta (tantalum), Y (yttrium), Hf (hafnium), and Al (aluminum).

[0054] The SiZr alloy target comprises, by mass percentage, 50%-70% Si (silicon) and 30%-50% Zr (zirconium). Specifically, for example, it comprises 55% Si and 45% Zr, or 58% Si and 42% Zr, or 60% Si and 40% Zr, or 62% Si and 38% Zr, or 64% Si and 36% Zr. The SiZrM alloy target comprises, by mass percentage, 50%-75% Si, 10%-40% Zr, and 0.1%-15% M. Specific examples include 50% Si, 40% Zr, and 10% M, or 54% Si, 38% Zr, and 8% M, or 56% Si, 30% Zr, and 14% M, or 58% Si, 37% Zr, and 5% M, or 60% Si, 28% Zr, and 12% M, or 65% Si, 30% Zr, and 5% M. It is understood that the SiZr alloy target or SiZrM alloy target may also contain unavoidable impurity elements, such as Fe (iron), Cr (chromium), Ca (calcium), Ti (titanium), Cu (copper), Mn (manganese), O (oxygen), N (nitrogen), etc., and the content of the impurity elements is less than 0.1%, more preferably less than 0.01%.

[0055] From the perspective of balancing the hardness and refractive index of the SiZrMOy layer, the M content in the SiZrM alloy target is preferably 0.1%-15%, and specific examples include 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc., and more preferably 1%-14%, or 2%-12%, or 5%-10%. It will be understood that when M is selected from a combination of two or more of W, Nb, Ta, Y, Hf, and Al, the M content is the sum of the contents of the combination of the two or more. For example, the M content is 10%. When M is only one element, it can be 10% Al, or 10% W, or 10% Nb; when M is a combination of two elements, it can be 8% Al and 2% W, or 5% Al and 5% Ta, or 4% Nb and 6% Y; when M is a combination of three elements, it can be 3% Al, 3% W and 4% Hf, or 2% Ta, 3% Y and 5% Al; when M is a combination of four elements, it can be 4% Al, 2% W, 2% Hf and 2% Nb.

[0056] Preferably, when M is selected from a combination of two or more of W, Nb, Ta, Y, Hf, and Al, the mass ratio between the element with the highest content and the element with the lowest content in the combination is 1-2, and specific examples include 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, and 2. For example, if M is 5% Al and 7% Ta, the mass ratio of Ta to Al is 1.2. For another example, if M is 3% Al, 3% W, and 4% Hf, the mass ratio of Hf to Al or W is 1.33. More preferably, the mass ratio is 1-1.5.

[0057] The target power source for the outermost protective layer 141 is preferably a high-power pulsed magnetron sputtering power source (HiPIMS power source). The HiPIMS power source can supply hundreds of kilowatts or even megawatts of instantaneous high power to the sputtering target in short pulses during the sputtering deposition process, thereby increasing the ionization rate of the sputtering target, allowing the SiZrOx layer and the SiZrMOy layer to have more chemical bonds, enhancing the adhesion of the outermost protective layer 141, and improving the surface hardness of the outermost protective layer 141. At the same time, the SiZrOx layer and the SiZrMOy layer are deposited more loosely, further reducing the refractive index of the outermost protective layer 141. Preferably, the operating voltage for magnetron sputtering the outermost protective layer 141 is 550V-1200V, the operating current is 200A-1000A, and the duty cycle is 5%-15%. The operating voltage may be exemplified by 550V, 600V, 650V, 700V, 750V, 800V, 850V, 900V, 950V, 1000V, 1050V, 1100V, 1150V, 1200V, etc.; more preferably, the operating voltage is 600V-1000V. The operating current may be exemplified by 200A, 300A, 400A, 500A, 600A, 700A, 800A, 900A, 1000A, etc.; more preferably, the operating current is 500A-900A. The duty cycle may be exemplified by 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0058] The outer glass plate 11 is transparent or tinted glass, with a thickness of 0.7 mm to 4 mm and a visible light transmittance greater than 70%. The inner glass plate 13 is transparent or tinted glass, with a thickness of 0.7 mm to 4 mm and a visible light transmittance greater than 70%. Preferably, at least one of the outer glass plate 11 and the inner glass plate 13 is tinted glass, thereby providing a better display background for the HUD image and improving the contrast between the HUD image and the display background. The total iron content (calculated as Fe2O3) of the transparent glass is less than or equal to 0.1%, even less than or equal to 0.05%, and further less than or equal to 0.01%, and the visible light transmittance of the transparent glass is 80% to 95%. The total iron content (calculated as Fe2O3) of the tinted glass is 0.1% to 0.8%, even 0.1% to 0.5%, and the visible light transmittance of the tinted glass is 75% to 90%. In the present application, the thickness of the outer glass plate 11 is preferably greater than that of the inner glass plate 13. The thickness of the outer glass plate 11 can be 2.1 mm to 4 mm, and the thickness of the inner glass plate 13 is 0.7 mm to 1.8 mm. For example, the thickness of the outer glass plate 11 is at least 0.3 mm greater than that of the inner glass plate 13. The use of a thinner inner glass plate 13 can form a laminated glass structure with an asymmetric thickness. On the basis of reducing the total thickness of the head-up display glass 200 to achieve lightweighting, it can also improve the strength of the head-up display glass 200 to a certain extent, and further improve the quality of the HUD image.

[0059] The thermoplastic interlayer 12 is a transparent or colored thermoplastic polymer film, and has a visible light transmittance greater than 70%. The visible light transmittance of the thermoplastic interlayer 12 may be, but is not limited to, 75%, 80%, 85%, or 90%. The thermoplastic interlayer 12 is used to bond the outer glass panel 11 and the inner glass panel 13 together to form a laminated glass structure. Preferably, the thermoplastic interlayer 12 is a colored thermoplastic polymer film, which may be gray, green, or blue. This provides a better display background for the HUD image and improves the contrast between the HUD image and the display background. The thermoplastic polymer film may be made of at least one of polyvinyl butyral (PVB), polyurethane (PU), ethylene-vinyl acetate copolymer (EVA), and ionomer (SGP). The thickness of the thermoplastic intermediate layer 12 is 0.38 mm to 2.28 mm, and specifically can be but not limited to 0.38 mm, 0.76 mm, 1.14 mm, 1.52 mm, 1.9 mm, 2.28 mm, or other values ​​between 0.38 mm and 2.28 mm.

[0060] In the present application, the thermoplastic interlayer 12 can be a single-layer structure or a multi-layer structure. Examples of multi-layer structures include double-layer structures, triple-layer structures, quadruple-layer structures, and pentalayer structures. The thermoplastic interlayer 12 can also have other functions, such as providing at least one tinted area to act as a shadow band to reduce sunlight interference to the human eye, adding infrared absorbers to provide sun protection or heat insulation, adding ultraviolet absorbers to provide ultraviolet protection, or having at least one layer of a multi-layer structure with a higher plasticizer content to provide sound insulation. Traditional head-up display glass typically uses wedge-shaped PVB with a wedge angle of at least 0.3 mrad to eliminate ghosting (secondary images), making the design, production, and commissioning of head-up display systems relatively difficult. The head-up display glass 200 provided in this application can be directly replaced with a standard thermoplastic interlayer of uniform thickness, with a wedge angle substantially equal to zero. It is understandable that the present application may also use a wedge-shaped thermoplastic interlayer with a smaller wedge angle. Preferably, the wedge angle of the wedge-shaped thermoplastic interlayer is 0.01-0.15 mrad, and specific examples include 0.01 mrad, 0.02 mrad, 0.03 mrad, 0.04 mrad, 0.05 mrad, 0.06 mrad, 0.07 mrad, 0.08 mrad, 0.09 mrad, 0.10 mrad, 0.11 mrad, 0.12 mrad, 0.13 mrad, 0.14 mrad, 0.15 mrad, etc. This can further eliminate perspective ghosting caused by scenes in the vehicle's external environment passing through the head-up display glass 200. The wedge-shaped thermoplastic interlayer with a smaller wedge angle can be obtained through a simple stretching process, thereby being able to simultaneously eliminate reflective ghosting and perspective ghosting in a low-cost manner, thereby obtaining a higher-quality head-up display image and observation effect.

[0061] The head-up display glass 200 further includes a light-shielding layer 15 disposed around the perimeter of the head-up display glass 200. The area where the light-shielding layer 15 is disposed has a low visible light transmittance, shielding and protecting interior components from direct sunlight and causing aging and damage, thereby increasing the service life of the components. The light-shielding layer 15 also shields the interior components, ensuring an overall aesthetic appearance when viewed from the outside. The area of ​​the head-up display glass 200 where the light-shielding layer 15 is disposed is referred to as the peripheral zone. The visible light transmittance of the peripheral zone is less than or equal to 5%, preferably less than or equal to 3%, more preferably less than or equal to 1%, or even substantially zero, i.e., completely opaque. The area of ​​the head-up display glass 200 where the light-shielding layer 15 is not disposed is referred to as the central zone. The head-up display glass 200 provided herein can be used as a front windshield. To meet safety standards, the visible light transmittance of the central zone is greater than or equal to 70%.

[0062] In Figures 2 to 7, the transparent nanofilm 14 also includes at least one stacked structure, which is arranged between the fourth surface 132 and the outermost protective layer 141. 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 1.61-2.75, and the refractive index of the low refractive index layer is 1.35-1.60.

[0063] The material of the high refractive index layer is selected from at least one of oxides, nitrides or oxynitrides of Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi and Ta. Specific examples of materials for the high refractive index layer include zinc tin oxide (ZnSnOt), magnesium-doped zinc tin oxide (ZnSnMgOt), titanium-doped zinc tin oxide (ZnSnTiOt), zirconium-doped zinc tin oxide (ZnSnZrOt), silicon aluminum nitride (SiAlNt), silicon zirconium nitride (SiZrNt), silicon aluminum oxynitride (SiAlONt), silicon zirconium oxynitride (SiZrONt), silicon nitride (SiNt), zirconium oxide (ZrOt), zinc oxide (ZnOt), aluminum-doped zinc oxide (AZO), hafnium- and aluminum-doped zinc oxide (HAZO), yttrium-doped zinc oxide (YZO), gallium-doped zinc oxide (GZO), titanium oxide (TiOt), niobium oxide (Nb2O5), and silicon zirconium nitride (SiZrNt). The high refractive index layer is formed by a magnetron sputtering process, and the value of t can be determined according to whether the magnetron sputtering process is deposited in a stoichiometric manner, a substoichiometric manner, or a superstoichiometric manner.

[0064] In some embodiments, in consideration of production cost control and process convenience, the target power supply of the high refractive index layer is a medium frequency magnetron sputtering power supply (MF power supply), and the duty cycle of magnetron sputtering of the high refractive index layer is 100%.

[0065] In other embodiments, in order to better achieve the optical properties, mechanical properties, and appearance color of the transparent nanofilm 14, the target power supply of at least one of the high refractive index layers is a high-power pulsed magnetron sputtering power supply (HiPIMS power supply), and the duty cycle of the magnetron sputtering of at least one of the high refractive index layers is 5%-15%. It can be understood that the target power supply of one of the multiple high refractive index layers is a HiPIMS power supply, and the remaining target power supplies are MF power supplies; or the target power supplies of all high refractive index layers can be HiPIMS power supplies; from the perspective of balancing cost and performance, it is preferred that the target power supply of the high refractive index layer in the laminated structure closest to the outermost protective layer is a HiPIMS power supply.

[0066] The material of the low-refractive-index layer is selected from at least one of an oxide, nitride, carbide, or fluoride of Si, Al, or Mg. Specific examples of the material of the low-refractive-index layer include silicon oxide (SiO2), aluminum oxide (Al2O3), magnesium oxide (MgO), and magnesium fluoride (MgF). The low-refractive-index layer is formed by a magnetron sputtering process, with the target power supply of the low-refractive-index layer being a medium-frequency magnetron sputtering power supply, and the duty cycle of the magnetron sputtering of the low-refractive-index layer being 100%.

[0067] In Figures 2 to 5 , the outermost protective layer 141 is in direct contact with the first, second, and third low-refractive-index layers 143, 145, and 147 in the closest stacked structure. Together, the outermost protective layer 141, 143, 145, and 147 form the outermost low-refractive-index layer of the transparent nanofilm 14. The outermost protective layer 141 not only serves as the outermost layer of the transparent nanofilm 14 to improve its mechanical properties, but also, together with the first, second, and third low-refractive-index layers 143, 145, and 147, adjusts the optical properties and color of the transparent nanofilm 14. This facilitates the exposed use of the transparent nanofilm 14 on the interior surface of vehicle glass. This also helps reduce production costs. Preferably, the outermost protective layer 141 has a physical thickness of 30 nm to 110 nm. More preferably, the physical thickness of the outermost protective layer 141 is 30 nm-100 nm, or 30 nm-90 nm, or 30 nm-80 nm, or 30 nm-70 nm, or 30 nm-60 nm, etc.

[0068] As shown in FIG2 , the transparent nanofilm 14 includes a laminated structure, which includes a first high refractive index layer 142 and a first low refractive index layer 143. The transparent nanofilm 14 specifically includes a first high refractive index layer 142, a first low refractive index layer 143, and an outermost protective layer 141 sequentially deposited on the fourth surface 132. The outermost protective layer 141 is in direct contact with the first low refractive index layer 143 in the laminated structure. The physical thickness of the first high refractive index layer 142 is 30 nm to 120 nm, and the physical thickness of the first low refractive index layer 143 is 5 nm to 90 nm. Optionally, the physical thickness of the first low refractive index layer 143 in the laminated structure is greater than the physical thickness of the outermost protective layer 141.

[0069] As shown in FIG3 , the transparent nanofilm 14 includes two stacked structures. The first stacked structure includes a first high refractive index layer 142 and a first low refractive index layer 143, and the second stacked structure includes a second high refractive index layer 144 and a second low refractive index layer 145. The transparent nanofilm 14 specifically includes a first high refractive index layer 142, a first low refractive index layer 143, a second high refractive index layer 144, a second low refractive index layer 145, and an outermost protective layer 141 sequentially stacked and deposited on the fourth surface 132. The outermost protective layer 141 is in direct contact with the second low refractive index layer 145 in the second stacked structure. The physical thickness of the first high refractive index layer 142 is 5 nm to 190 nm, the physical thickness of the first low refractive index layer 143 is 5 nm to 110 nm, the physical thickness of the second high refractive index layer 144 is 30 nm to 120 nm, and the physical thickness of the second low refractive index layer 145 is 5 nm to 90 nm. Optionally, the physical thickness of the second low refractive index layer 145 in the second stacked structure is greater than the physical thickness of the outermost protective layer 141 .

[0070] As shown in Figure 4, the transparent nanofilm 14 includes three stacked structures, the first stacked structure includes a first high refractive index layer 142 and a first low refractive index layer 143, the second stacked structure includes a second high refractive index layer 144 and a second low refractive index layer 145, and the third stacked structure includes a third high refractive index layer 146 and a third low refractive index layer 147. The transparent nanofilm 14 specifically includes a first high refractive index layer 142, a first low refractive index layer 143, a second high refractive index layer 144, a second low refractive index layer 145, a third high refractive index layer 146, a third low refractive index layer 147 and an outermost protective layer 141 deposited in sequence on the fourth surface 132, and the outermost protective layer 141 is in direct contact with the third low refractive index layer 147 in the third stacked structure. The physical thickness of the first high refractive index layer 142 is 120 nm to 190 nm, the physical thickness of the first low refractive index layer 143 is 5 nm to 50 nm, the physical thickness of the second high refractive index layer 144 is 110 nm to 190 nm, the physical thickness of the second low refractive index layer 145 is 20 nm to 110 nm, the physical thickness of the third high refractive index layer 146 is 30 nm to 120 nm, and the physical thickness of the third low refractive index layer 147 is 5 nm to 90 nm. Optionally, the physical thickness of the third low refractive index layer 147 in the third stacked structure is greater than the physical thickness of the outermost protective layer 141.

[0071] In some embodiments, at least one high refractive index layer is composed of a plurality of high refractive index sublayers, that is, at least one high refractive index layer includes at least two high refractive index sublayers, and the refractive indices of the two adjacent high refractive index sublayers are different. In order to better achieve that the optical properties, mechanical properties, and appearance color of the transparent nanofilm 14 all meet the comprehensive requirements of vehicle window glass, it is preferred that the refractive index of the high refractive index sublayer closest to the fourth surface 132 is 1.61-2.10, and the refractive index of the high refractive index sublayer farthest from the fourth surface is 2.11-2.75. Preferably, the refractive index of the high refractive index sublayer farthest from the fourth surface is at least 0.3 greater than the refractive index of the high refractive index sublayer closest to the fourth surface 132. Considering the aspects of being conducive to production cost control and the convenience of film system design, it is preferred that the at least one high refractive index layer includes two high refractive index sublayers or three high refractive index sublayers.

[0072] As shown in Figure 5, the transparent nanofilm 14 includes two stacked structures, the first stacked structure includes a first high refractive index layer 142 and a first low refractive index layer 143, and the second stacked structure includes a second high refractive index layer 144 and a second low refractive index layer 145. The second high refractive index layer 144 includes two high refractive index sublayers, namely a high refractive index sublayer 1441 directly in contact with the first low refractive index layer 143 and a high refractive index sublayer 1442 directly in contact with the second low refractive index layer 145. The refractive index of the high refractive index sublayer 1441 can be exemplified as 1.9-2.2, and the refractive index of the high refractive index sublayer 1442 can be exemplified as 2.5-2.75.

[0073] In Figures 6 and 7, an optical adjustment layer 150 is further provided between the outermost protective layer 141 and the nearest low-refractive index layer in the laminated structure. The refractive index of the optical adjustment layer 150 is 2.10-2.75. The outermost protective layer 141 independently constitutes the outermost low-refractive index layer of the transparent nanofilm 14, which can further improve the hardness, wear resistance, and scratch resistance of the transparent nanofilm 14. At the same time, together with the optical adjustment layer 150, it forms a new laminated structure that can not only enable the transparent nanofilm 14 to maintain a high reflectivity for P-polarized light to ensure high brightness and high contrast of the HUD image, but also facilitate the exposed use of the transparent nanofilm 14 on the interior surface of the vehicle. Preferably, the physical thickness of the outermost protective layer 141 is 60nm-120nm. More preferably, the physical thickness of the outermost protective layer 141 is 70nm-120nm, or 80nm-120nm, or 90nm-120nm, or 100nm-120nm.

[0074] The material of the optical adjustment layer 150 is selected from at least one of the oxides, nitrides, or oxynitrides of Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, and Ta. Specific examples of the material of the optical adjustment layer 150 include zinc tin oxide (ZnSnOt), silicon nitride (SiNt), zirconium oxide (ZrOt), titanium oxide (TiOt), niobium oxide (Nb2O5), and silicon zirconium nitride (SiZrNt). The optical adjustment layer 150 is formed by a magnetron sputtering process, and the target power supply of the optical adjustment layer 150 is a medium frequency magnetron sputtering power supply (MF power supply) or a high power pulsed magnetron sputtering power supply (HiPIMS power supply). When using an MF power supply, the duty cycle of magnetron sputtering the optical adjustment layer 150 is 100%. When using a HiPIMS power supply, the duty cycle of magnetron sputtering the optical adjustment layer 150 is 5%-15%. The value of t can be determined according to whether the magnetron sputtering process is deposited in a stoichiometric, substoichiometric or superstoichiometric manner.

[0075] As shown in Figure 6, the transparent nanofilm 14 includes a laminated structure and an optical adjustment layer 150, the laminated structure includes a first high refractive index layer 142 and a first low refractive index layer 143, the transparent nanofilm 14 specifically includes a first high refractive index layer 142, a first low refractive index layer 143, an optical adjustment layer 150 and an outermost protective layer 141 sequentially stacked and deposited on the fourth surface 132, the optical adjustment layer 150 is in direct contact with the first low refractive index layer 143, and the outermost protective layer 141 and the optical adjustment layer 150 together constitute a new laminated structure, and the transparent nanofilm 14 is equivalent to actually including two laminated structures. Among them, the physical thickness of the optical adjustment layer 150 is 30nm-120nm. Optionally, the physical thickness of the outermost protective layer 141 is greater than the thickness of the optical adjustment layer 150.

[0076] As shown in Figure 7, the optical adjustment layer 150 is composed of multiple optical adjustment sublayers, that is, the optical adjustment layer 150 includes at least two optical adjustment sublayers, namely, a first optical adjustment sublayer 1501 in direct contact with the first low refractive index layer 143 and a second optical adjustment sublayer 1502 in direct contact with the outermost protective layer 141. The refractive index of the first optical adjustment sublayer 1501 can be exemplified as 1.9-2.2, and the refractive index of the second optical adjustment sublayer 1502 can be exemplified as 2.5-2.75.

[0077] The head-up display glass 200 provided herein maintains a high reflectivity for P-polarized light, ensuring high brightness and contrast for the HUD image. Preferably, the reflectivities R1, R2, and R3 for P-polarized light incident at a 65° angle of incidence with wavelengths of 629nm, 529nm, and 469nm are ≥19%, ≥19%, and ≥19%, respectively. The improved reflectivity of the head-up display glass 200 for P-polarized light can also reduce the transmission power of the projection device 100, reduce heat generation, and even reduce the size of the projection device 100. Furthermore, the head-up display glass 200 provided herein unexpectedly smoothes the reflection spectrum of P-polarized light, facilitating neutral color display of the HUD image. Preferably, the difference between the maximum and minimum values ​​of R1, R2, and R3 is less than or equal to 3%, more preferably less than or equal to 2%, and even more preferably less than or equal to 1%.

[0078] Comparative Examples 1-3 and Examples 1-10

[0079] In the present application, a 2.1 mm thick transparent glass substrate was prepared, and the film layer structures of Comparative Examples 1-3 and Examples 1-10 were deposited on the surface of the transparent glass substrate by a magnetron sputtering process. The transparent glass substrate having the film layer structure was subjected to a high-temperature heat treatment of at least 500° C., and then the refractive index n and extinction coefficient k of the test samples of Comparative Examples 1-3 and Examples 1-10 were measured, and the measurement results were recorded in Table 1.

[0080] Comparative Example 1: transparent glass substrate / SiO2 layer, the sputtering target is a pure Si target.

[0081] Comparative Example 2: Transparent Glass Substrate / SiZrO X The sputtering target is a SiZr alloy target, which contains 64% Si and 36% Zr.

[0082] Comparative Example 3: Transparent glass substrate / ZrO2 layer, sputtering target is ZrO 1.4 Ceramic target.

[0083] In the magnetron sputtering processes of Comparative Examples 1-3, the process gases are Ar and O2, the target power supply is MF power supply, and the duty cycle is 100%.

[0084] Example 1-3: Transparent glass substrate / SiZrO X The sputtering target is a SiZr alloy target, which contains 64% Si and 36% Zr.

[0085] Example 4: Transparent Glass Substrate / SiZrAlO XThe sputtering target is a SiZrAl alloy target, which contains 58.5% Si, 36.5% Zr and 5% Al.

[0086] Example 5-6: Transparent glass substrate / SiZrAlWO X The sputtering target is a SiZrAlW alloy target, which contains 55% Si, 35% Zr, 5% Al and 5% W.

[0087] Example 7: Transparent Glass Substrate / SiZrAlTaO X The sputtering target is a SiZrAlTa alloy target, which contains 54% Si, 34% Zr, 5% Al and 7% Ta.

[0088] Examples 8-9: Transparent Glass Substrate / SiZrYNbO X The sputtering target is a SiZrYNb alloy target, which contains 56% Si, 34% Zr, 5% Y and 5% Nb.

[0089] Example 10: Transparent Glass Substrate / SiZrAlTaO X The sputtering target is a SiZrAlTa alloy target, which contains 71% Si, 17% Zr, 5% Al and 7% Ta.

[0090] In the magnetron sputtering process of Examples 1-10, the process gases are Ar and O2, the target power supply is a HiPIMS power supply, and the duty cycle is 5% to 15%.

[0091] Table 1: Measurement results of test samples of Comparative Examples 1-3 and Examples 1-10

[0092] It can be seen from Table 1 that Comparative Examples 1 and 2 use MF power supply for magnetron sputtering, although they can obtain SiO2 layers with a refractive index n≤1.6 and SiZrO Xlayer, but their extinction coefficients k are all 0. Comparative Example 3 uses an MF power supply for magnetron sputtering to obtain a high-refractive-index ZrO2 layer with a refractive index n=2.24 and an extinction coefficient k=0.00054. Compared with Comparative Examples 1-3, Examples 1-10 use a HiPIMS power supply for magnetron sputtering, using a SiZr alloy target or a SiZrM alloy target to obtain a SiZrOx layer or SiZrMOy layer with a refractive index n=1.50-1.60. While maintaining a low refractive index, the extinction coefficient k of the SiZrOx layer or SiZrMOy layer is increased to 0.00001-0.001, making the SiZrOx layer or SiZrMOy layer more suitable as the outermost protective layer 141 of the transparent nanofilm 14, making the reflection spectrum of the transparent nanofilm 14 for P-polarized light smoother, which is conducive to achieving a neutral color display of the HUD image. Optionally, the refractive index n of the SiZrOx layer or SiZrMOy layer serving as the outermost protective layer 141 is 1.50-1.57, or 1.51-1.56, or 1.52-1.55, etc. Optionally, the extinction coefficient k of the SiZrOx layer or SiZrMOy layer serving as the outermost protective layer 141 is 0.00003-0.0009, or 0.00008-0.0008, or 0.0001-0.0007.

[0093] Comparative Examples 4-5 and Examples 11-12

[0094] An outer glass plate 11, a thermoplastic interlayer 12, and an inner glass plate 13 are prepared. The outer glass plate 11 is 2.1 mm thick transparent glass (white glass), the thermoplastic interlayer 12 is 0.76 mm thick standard transparent PVB, and the inner glass plate 13 is 2.1 mm thick transparent glass (white glass). The transparent nanofilms in Comparative Examples 4-5 and Examples 11-12 are deposited on the fourth surface 132 of the inner glass plate 13 by a magnetron sputtering process. Then, the glass is processed and manufactured according to the vehicle glass production process to obtain the head-up display glass in Comparative Examples 4-5 and Examples 11-12.

[0095] A head-up display system is formed by combining a projection device with the head-up display glass of Comparative Examples 4-5 and Examples 11-12. The projection device generates projection light containing at least 99% P-polarized light. The projection light is incident on the transparent nanofilm at an incident angle of 38°-85°. The position of the projection device and the incident angle of the projection light are adjusted so that the head-up display image observed by the observer is clearest. The P-polarized light reflectivity, reflected color, and visible light transmittance are measured and calculated, and the film hardness test is performed. The test results are recorded in Table 2.

[0096] P-polarized light reflectivity: From the transparent nanofilm side, the reflectivity of the head-up display glass for P-polarized light with wavelengths of 629nm, 529nm, and 469nm incident at an incident angle of 65° is measured and calculated according to ISO9050: R1, R2, and R3, respectively.

[0097] Reflected color: Measured from the first surface at a 0° angle of incidence, using a D65 illuminant and a 10° field of view. Calculate the a and b values ​​according to the CIE Lab color model. The a value represents red and green, and the b value represents yellow and blue.

[0098] Visible light transmittance TL: The transmittance of the head-up display glass to visible light with a wavelength of 380nm-780nm is measured and calculated according to ISO9050;

[0099] Film hardness test: Pencil hardness test of transparent nanofilm was conducted according to GB / T 6739-2006. Gel pen hardness test was conducted according to GB / T 6739-2006, using 0.5mm gel pen refill instead of pencil. Abrasion resistance test of transparent nanofilm was conducted according to GB / T 18915.2-2013.

[0100] Table 2: Test results of Comparative Examples 4-5 and Examples 11-12

[0101] In Table 2: the TiOt sub-layer of the second high refractive index layer and the outermost protective layer are magnetron sputtered using a HiPIMS power supply, and the other film layers are magnetron sputtered using an MF power supply.

[0102] Neither the transparent nanofilms of Comparative Examples 4 nor 5 have an outermost protective layer. The layer of the transparent nanofilm of Comparative Example 4 furthest from the fourth surface is the SiO2 layer of Comparative Example 1, while the layer of the transparent nanofilm of Comparative Example 5 furthest from the fourth surface is the SiZrOx layer of Comparative Example 2. The visible light transmittance, P-polarized light reflectance, and reflected color of the head-up display glass of Comparative Examples 4 and 5 all meet the requirements for implementing head-up display functions. However, the film hardness of the transparent nanofilms of Comparative Example 4 and 5 is not suitable for exposed use on interior vehicle surfaces. Furthermore, compared to Comparative Example 4, the refractive index of the SiZrOx layer of Comparative Example 5 is greater than that of the SiO2 layer of Comparative Example 4, resulting in a certain decrease in the P-polarized light reflectance of Comparative Example 5.

[0103] In Example 11, the SiZrOx layer of Example 1 was set as the outermost protective layer, and in Example 12, the SiZrAlTaO XThe outermost protective layer, which together with the second low-refractive-index layer, constitutes the outermost low-refractive-index layer of the transparent nanofilm, is used. The head-up display glass of Examples 11 and 12 exhibits visible light transmittance, P-polarized light reflectivity, and reflected color that meet the requirements for implementing a head-up display function. Furthermore, the hardness of the transparent nanofilms of Examples 11 and 12 is suitable for exposed use on interior vehicle surfaces. The difference between the maximum and minimum values ​​of the P-polarized light reflectivities R1, R2, and R3 in Example 11 is less than or equal to 0.5%, while the difference between the maximum and minimum values ​​of the P-polarized light reflectivities R1, R2, and R3 in Example 12 is less than or equal to 3%.

[0104] At the same time, the SiZrOx layer of Example 11 and the SiZrAlTaO X The physical thickness of each layer is smaller than the physical thickness of the second low refractive index layer, which is also beneficial to reducing production costs.

[0105] Compared with Comparative Example 5, the refractive index of the SiZrOx layer of Example 11 is lower than that of the SiZrOx layer of Comparative Example 5, the extinction coefficient of the SiZrOx layer of Example 11 is greater than that of the SiZrOx layer of Comparative Example 5, and the P-polarized light reflectivity of Example 11 is improved to a certain extent.

[0106] Examples 13-14

[0107] An outer glass plate 11, a thermoplastic interlayer 12, and an inner glass plate 13 are prepared. The outer glass plate 11 is a 2.1 mm thick transparent glass (white glass), the thermoplastic interlayer 12 is a 0.76 mm thick standard transparent PVB, and the inner glass plate 13 is a 2.1 mm thick transparent glass (white glass). The transparent nanofilm in Examples 13-14 is deposited on the fourth surface 132 of the inner glass plate 13 by a magnetron sputtering process, and then processed and manufactured according to the vehicle glass production process to obtain the head-up display glass in Examples 13-14.

[0108] A head-up display system is formed by combining a projection device with the head-up display glass of Examples 13-14. The projection device generates projection light containing at least 99% P-polarized light. The projection light is incident on the transparent nanofilm at an incident angle of 38°-85°. The position of the projection device and the incident angle of the projection light are adjusted so that the head-up display image observed by the observer is clearest. The P-polarized light reflectivity, reflected color, and visible light transmittance are measured and calculated, and the film hardness test is performed. The test results are recorded in Table 3.

[0109] Table 3: Test results of Examples 13-14

[0110] In Table 3: the outermost protective layer, the first high refractive index layer of Example 13, and the TiOt sublayer of the third high refractive index layer of Example 14 were all magnetron sputtered using a HiPIMS power supply, and the other film layers were magnetron sputtered using an MF power supply.

[0111] In Example 13, the SiZrAlWOx layer of Example 5 is used as the outermost protective layer, which, together with the first low-refractive-index layer, constitutes the outermost low-refractive-index layer of the transparent nanofilm. In Example 14, the SiZrYNbOx layer of Example 8 is used as the outermost protective layer, which, together with the third low-refractive-index layer, constitutes the outermost low-refractive-index layer of the transparent nanofilm. The head-up display glass of Examples 13 and 14 has visible light transmittance, P-polarized light reflectivity, and reflected color that meet the requirements for head-up display functions. Furthermore, the hardness of the transparent nanofilms of Examples 13 and 14 is suitable for exposed use on interior vehicle surfaces. The difference between the maximum and minimum values ​​of the P-polarized light reflectivities R1, R2, and R3 in Example 13 is less than or equal to 3%, while the difference between the maximum and minimum values ​​of the P-polarized light reflectivities R1, R2, and R3 in Example 14 is less than or equal to 1%.

[0112] At the same time, the physical thickness of the outermost protective layer in Example 13 and Example 14 is less than the physical thickness of the low refractive index layer closest to it, which is also beneficial to reducing production costs.

[0113] Examples 15-18

[0114] An outer glass plate 11, a thermoplastic interlayer 12, and an inner glass plate 13 are prepared. The outer glass plate 11 is a 2.1 mm thick transparent glass (white glass), the thermoplastic interlayer 12 is a 0.76 mm thick standard transparent PVB, and the inner glass plate 13 is a 2.1 mm thick transparent glass (white glass). The transparent nanofilms in Examples 15-18 are deposited on the fourth surface 132 of the inner glass plate 13 by a magnetron sputtering process, and then processed and manufactured according to the vehicle glass production process to obtain the head-up display glass in Examples 15-18.

[0115] A head-up display system is formed by combining a projection device with the head-up display glass of Examples 15-18. The projection device generates projection light containing at least 99% P-polarized light. The projection light is incident on the transparent nanofilm at an incident angle of 38°-85°. The position of the projection device and the incident angle of the projection light are adjusted so that the head-up display image observed by the observer is clearest. The P-polarized light reflectivity, reflected color, and visible light transmittance are measured and calculated, and the film hardness test is performed. The test results are recorded in Table 4.

[0116] Table 4: Test results of Examples 15-18

[0117] In Table 4: The TiOt sublayer and the outermost protective layer in the optical adjustment layer are magnetron sputtered using a HiPIMS power supply, and the other film layers are magnetron sputtered using an MF power supply.

[0118] In Example 15, the SiZrOx (n=1.54, k=0.00003) of Example 2 was set as the outermost protective layer, in Example 16, the SiZrOx (n=1.50, k=0.00008) of Example 3 was set as the outermost protective layer, in Example 16, the SiZrAlOx (n=1.54, k=0.00005) of Example 4 was set as the outermost protective layer, and in Example 18, the SiZrYNbOx (n=1.56, k=0.00064) of Example 9 was set as the outermost protective layer. The outermost protective layer of Examples 15-18 independently constitutes the outermost low-refractive-index layer of the transparent nanofilm, and an optical adjustment layer is further disposed between the outermost protective layer and the nearest low-refractive-index layer. Together, the outermost protective layer and the optical adjustment layer form a new laminated structure. The visible light transmittance, P-polarized light reflectivity, and reflected color of the head-up display glass of Examples 15-18 all meet the requirements for implementing a head-up display function. The film hardness of the transparent nanofilm of Examples 15-18 is conducive to exposed use on interior vehicle surfaces. Specifically, the difference between the maximum and minimum values ​​of the P-polarized light reflectivities R1, R2, and R3 of Example 15 is less than or equal to 0.5%, the difference between the maximum and minimum values ​​of the P-polarized light reflectivities R1, R2, and R3 of Example 16 is less than or equal to 1.5%, and the difference between the maximum and minimum values ​​of the P-polarized light reflectivities R1, R2, and R3 of Examples 17-18 is less than or equal to 1%.

Claims

1. A head-up display glass, characterized in that: The head-up display glass includes: Laminated glass, the laminated glass comprising an outer glass panel, an inner glass panel and a thermoplastic interlayer arranged between the outer glass panel and the inner glass panel, the outer glass panel comprising a first surface and a second surface opposite to each other, the inner glass panel comprising a third surface and a fourth surface opposite to each other, the thermoplastic interlayer being arranged between the second surface and the third surface; and A transparent nanofilm, wherein the transparent nanofilm is disposed on the fourth surface, the transparent nanofilm can reflect P polarized light, and the transparent nanofilm includes an outermost protective layer farthest from the fourth surface, the outermost protective layer is a SiZrOx layer or a SiZrMOy layer, wherein x satisfies 1<x<3, y satisfies 1<y<3, and M is selected from one or a combination of two or more of W, Nb, Ta, Y, Hf, and Al; The refractive index n of the outermost protective layer is 1.50-1.60, and the extinction coefficient k of the outermost protective layer is 0.00001-0.

001.

2. The head-up display glass according to claim 1, characterized in that: The pencil hardness of the outermost protective layer is ≥9H.

3. The head-up display glass according to claim 1, characterized in that: The physical thickness of the outermost protective layer is 30nm-120nm.

4. The head-up display glass according to claim 1, characterized in that: The outermost protective layer is formed by a magnetron sputtering process, and the sputtering target material of the outermost protective layer is a SiZr alloy target or a SiZrM alloy target.

5. The head-up display glass according to claim 4, characterized in that: In terms of mass percentage, the SiZr alloy target contains 50%-70% Si and 30%-50% Zr, and the SiZrM alloy target contains 50%-75% Si, 10%-40% Zr and 0.1%-15% M.

6. The head-up display glass according to claim 5, characterized in that: M is selected from a combination of two or more of W, Nb, Ta, Y, Hf, and Al, and the mass ratio between the element with the highest content and the element with the lowest content in the combination is 1-2.

7. The head-up display glass according to claim 4, characterized in that: The target power supply of the outermost protective layer is a high-power pulse magnetron sputtering power supply, and the working voltage of magnetron sputtering of the outermost protective layer is 550V-1200V, the working current is 200A-1000A, and the duty cycle is 5%-15%.

8. The head-up display glass according to claim 1, characterized in that: The transparent nanofilm also includes at least one stacked structure, which is arranged between the fourth surface and the outermost protective layer. 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 1.61-2.75, and the refractive index of the low refractive index layer is 1.35-1.

60.

9. The head-up display glass according to claim 8, characterized in that: The high refractive index layer and the low refractive index layer are formed by a magnetron sputtering process, the target power supply of the low refractive index layer is a medium frequency magnetron sputtering power supply, and the duty ratio of magnetron sputtering of the low refractive index layer is 100%.

10. The head-up display glass according to claim 9, characterized in that: The target power source of the high refractive index layer is a medium frequency magnetron sputtering power source, and the duty ratio of magnetron sputtering of the high refractive index layer is 100%.

11. The head-up display glass according to claim 9, characterized in that: The target power source of at least one of the high refractive index layers is a high-power pulsed magnetron sputtering power source, and the duty cycle of magnetron sputtering of at least one of the high refractive index layers is 5%-15%.

12. The head-up display glass according to claim 8, characterized in that: The outermost protective layer is in direct contact with the low refractive index layer in the nearest stacked structure, and the physical thickness of the outermost protective layer is 30nm-110nm.

13. The head-up display glass according to claim 12, characterized in that: The physical thickness of the low refractive index layer in the closest stacked structure is greater than the physical thickness of the outermost protective layer.

14. The head-up display glass according to claim 8, characterized in that: An optical adjustment layer is further arranged between the outermost protective layer and the low refractive index layer in the closest stacked structure. The refractive index of the optical adjustment layer is 2.10-2.75, and the physical thickness of the outermost protective layer is 60nm-120nm.

15. The head-up display glass according to claim 14, characterized in that: The physical thickness of the outermost protective layer is greater than the thickness of the optical adjustment layer.

16. The head-up display glass according to claim 14, characterized in that: The optical adjustment layer is formed by a magnetron sputtering process, the target power supply of the optical adjustment layer is a high-power pulse magnetron sputtering power supply, and the duty ratio of magnetron sputtering of the optical adjustment layer is 5%-15%.

17. The head-up display glass according to claim 8, characterized in that: The at least one high refractive index layer includes at least two high refractive index sublayers, the refractive index of the high refractive index sublayer closest to the fourth surface is 1.61-2.10, and the refractive index of the high refractive index sublayer farthest from the fourth surface is 2.11-2.

75.

18. The head-up display glass according to claim 1, characterized in that: The reflectivities of the head-up display glass for P-polarized light with wavelengths of 629 nm, 529 nm and 469 nm incident at an incident angle of 65° are R1, R2 and R3 respectively, wherein R1 is ≥19%, R2 is ≥19% and R3 is ≥19%.

19. A head-up display system, characterized in that: The head-up display system includes a projection device and a head-up display glass as described in any one of claims 1 to 18, wherein the projection device is used to generate projection light containing P-polarized light, the proportion of P-polarized light in the projection light is greater than or equal to 80%, and the projection light is incident on the transparent nanofilm at an incident angle of 38° to 85°.

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