Head-up display glass and head-up display system

Abstract

The present application provides a head-up display glass and a head-up display system, wherein the head-up display glass comprises an outer surface and an inner surface arranged opposite to each other, a transparent nano film capable of reflecting P polarized light is arranged on the inner surface, and the transparent nano film comprises a first high refractive index layer, a second high refractive index layer, a first low refractive index layer, a third high refractive index layer and a second low refractive index layer sequentially stacked on the inner surface, the refractive indexes of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer are greater than 1.8, and the refractive indexes of the first low refractive index layer and the second low refractive index layer are less than or equal to 1.8. The technical solution of the present application can solve the problems of unclear HUD images presented by traditional head-up display glass, so that the driver or passenger can see the HUD image more clearly, improve visual comfort, and enhance the user experience.

Description

Technical Field

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

[0002] Head Up Display (HUD) systems are increasingly used in vehicles. They can display virtual HUD images in real time in the driver's field of view, allowing the driver to observe driving information such as vehicle speed, engine speed, fuel consumption, tire pressure, navigation, and information from external smart devices without turning or lowering his head, which can greatly enhance driving safety and improve the driving experience.

[0003] At present, the head-up display system usually includes a projection device and a window glass. The window glass has an inner surface facing the inside of the car and an outer surface facing the outside of the car. The projection device projects the image information onto the inner surface of the window glass and enters the driver's eyes through reflection from the window glass. The traditional projection device mainly generates projection light containing S-polarized light, which is reflected at the inner surface from air to glass and at the outer surface from glass to air, respectively, thereby generating two offset images, the so-called ghosting phenomenon, resulting in unclear HUD images and poor visual comfort. Summary of the invention

[0004] Based on this, the present application provides a head-up display glass and a head-up display system, which can solve the problem of unclear HUD images presented by traditional head-up display glass, so that the driver or passenger can see the HUD image more clearly, improve visual comfort, and enhance the user experience.

[0005] In a first aspect, the present application provides a head-up display glass, comprising an outer surface and an inner surface arranged opposite to each other, wherein a transparent nanofilm capable of reflecting P-polarized light is arranged on the inner surface, and the transparent nanofilm comprises a first high refractive index layer, a second high refractive index layer, a first low refractive index layer, a third high refractive index layer and a second low refractive index layer stacked in sequence on the inner surface, wherein the refractive indexes of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer are greater than 1.8, and the refractive indexes of the first low refractive index layer and the second low refractive index layer are less than or equal to 1.8.

[0006] In a possible implementation manner, the refractive index of the first high refractive index layer is lower than that of the second high refractive index layer, and the difference between the refractive index of the first high refractive index layer and the second high refractive index is greater than or equal to 0.3.

[0007] In a possible implementation, the head-up display glass has a reflectivity of at least 13% for P-polarized light incident at an incident angle of 38° to 85°.

[0008] In a possible implementation, the head-up display glass has a reflectivity of at least 16% for P-polarized light incident at an incident angle of 55° to 85°.

[0009] In a possible implementation, the head-up display glass has a reflectivity of at least 18% for P-polarized light incident at an incident angle of 65°.

[0010] In a possible implementation manner, the reflectivity range of the head-up display glass to P-polarized light incident at an incident angle of 65° within a wavelength range of 460 nm-630 nm is less than or equal to 6%.

[0011] In a possible implementation manner, the thickness of the first low refractive index layer is 130nm-200nm, the thickness of the third high refractive index layer is 20nm-80nm, and the thickness of the second low refractive index layer is 80nm-130nm.

[0012] In a possible implementation manner, the thickness of the first high refractive index layer is 25 nm-75 nm, or the thickness of the first high refractive index layer is 85 nm-145 nm, or the thickness of the first high refractive index layer is greater than or equal to 200 nm.

[0013] In a possible implementation manner, the thickness of the second high refractive index layer is 5 nm-35 nm, or the thickness of the second high refractive index layer is 80 nm-145 nm, or the thickness of the second high refractive index layer is 190 nm-230 nm.

[0014] In a possible implementation manner, the thickness of the first high refractive index layer is 85 nm-145 nm, and the thickness of the second high refractive index layer is 5 nm-35 nm.

[0015] In a possible implementation manner, the thickness of the first high refractive index layer is 85 nm-145 nm, and the thickness of the second high refractive index layer is 190 nm-230 nm.

[0016] In a possible implementation manner, the thickness of the first high refractive index layer is 25 nm-75 nm, and the thickness of the second high refractive index layer is 80 nm-145 nm.

[0017] In a possible implementation manner, the thickness of the first high refractive index layer is 25 nm-75 nm, and the thickness of the second high refractive index layer is 190 nm-230 nm.

[0018] In a possible implementation, the head-up display glass includes laminated glass, the laminated glass includes an outer layer of glass, an inner layer of glass, and an intermediate layer arranged between the outer layer of glass and the inner layer of glass, the surface of the outer layer of glass away from the intermediate layer is the outer surface, the surface of the inner layer of glass away from the intermediate layer is the inner surface, the outer layer of glass is tinted glass and / or the intermediate layer is a tinted intermediate layer, and the visible light transmittance of the head-up display glass is greater than or equal to 70%.

[0019] In a possible implementation, the head-up display glass further includes one or more of an anti-fingerprint film, a heat insulation film, and an electric heating film.

[0020] In a second aspect, the present application provides a head-up display system, comprising a projection device and the head-up display glass as described above, wherein the projection device is used to generate projection light including 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°.

[0021] In a possible implementation, the projection light forms a head-up display main image through reflection by the transparent nanofilm, and the projection light forms a head-up display secondary image through reflection by the outer surface, and the ratio of the reflectivity of the head-up display main image to the reflectivity of the head-up display secondary image is greater than 10.

[0022] In a possible implementation manner, when the projection light enters the head-up display glass at an incident angle of 55°, a ratio of a reflectivity of the head-up display primary image to a reflectivity of the head-up display secondary image is greater than 480.

[0023] In a possible implementation manner, when the projection light enters the head-up display glass at an incident angle of 65°, a ratio of a reflectivity of the head-up display primary image to a reflectivity of the head-up display secondary image is greater than 45.

[0024] In a possible implementation, when measured from one side of the outer surface and incident on the head-up display glass at an incident angle of 65°, based on a D65 light source, the a value in the Lab value of the reflected color of the head-up display glass is less than or equal to 1, and the b value is less than or equal to 2.5.

[0025] The head-up display glass and head-up display system provided by the present application can better replace the traditional head-up display glass with a wedge-shaped intermediate layer, obtain a clear HUD image with no visual ghosting and high reflectivity, and can also meet the needs of drivers wearing sunglasses. It can also be used with projection light with an incident angle in the range of 38°-85°, and can meet the use of AR-HUD with a field of view angle greater than or equal to 10°, achieving image display at a longer distance and larger size, thereby further improving visual comfort and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying any creative work.

[0027] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0028] Figure 2 is a schematic diagram of the structure of a head-up display system provided in an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of the structure of a head-up display glass provided in an embodiment of the present application;

[0030] Figure 4 It is a schematic diagram of the structure of the transparent nanofilm provided in the embodiment of the present application. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can also be implemented in other ways different from those described herein, and therefore, the present application is not limited to the following embodiments.

[0032] For ease of understanding, the terms involved in the embodiments of the present application are first explained.

[0033] Thickness: physical thickness.

[0034] Refractive index: It is the refractive index of the transmitted light at a wavelength of 550nm.

[0035] Incident angle: It is the angle between the projection light generated by the projection device when it is incident on the head-up display glass and the surface normal at the incident position.

[0036] The present application provides a head-up display glass and a head-up display system, which can solve the problem that the HUD image presented by the traditional head-up display glass is not clear, so that the driver or passenger can see the HUD image more clearly. Since the traditional head-up display glass uses a wedge-shaped intermediate layer to eliminate ghosting, it has the disadvantages of high material cost, high process difficulty, different wedge angles need to be designed for different car models, and poor applicability. The head-up display glass provided by the present application can better replace this traditional head-up display glass. At the same time, this traditional head-up display glass can only be used with projection light with an incident angle in the range of 60°-70°, and the field of view (FOV) of the corresponding HUD image is usually less than 5°, which can only realize close-range and small-size image display. Moreover, as the range of the incident angle increases, the ghosting problem of the head-up display projection imaging becomes more and more serious, and the ghosting problem cannot be completely solved by relying solely on the wedge-shaped intermediate layer. Compared with this traditional head-up display glass, the head-up display glass provided in the present application can also be used with projection light with an incident angle in the range of 38°-85°, and can meet the use of AR-HUD (augmented reality head-up reality) with a field of view angle greater than or equal to 10°, achieving longer distance and larger size image display, thereby further improving visual comfort and enhancing the user experience.

[0037] See also Figure 1 The vehicle 1000 includes a vehicle body 200 and a head-up display system 100. The head-up display system 100 is connected to the vehicle body 200. The head-up display system 100 includes a projection device 20 and a head-up display glass 10.

[0038] It should be noted that Figure 1 The purpose is only to schematically describe the connection relationship between the vehicle body 200 and the head-up display system 100, and it does not specifically limit the connection position, specific structure and quantity of each device. The structure illustrated in the embodiment of the present application does not constitute a specific limitation on the vehicle 1000. In other embodiments of the present application, the vehicle 1000 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The illustrated components can be implemented in hardware, software, or a combination of software and hardware.

[0039] The head-up display glass 10 may be a front windshield of the vehicle 1000, and the projection device 20 may be disposed inside the vehicle. Figure 2, the projection device 20 emits projection light toward the head-up display glass 10, and the projection light is reflected by the head-up display glass 10, and the image presented is received by the human eye. The angle a between the center line of the projection light beam emitted by the projection device 20 and the surface normal 1 at the incident position of the head-up display glass 10 ranges from 38° to 85° (including the endpoint values ​​38° and 85°). In order to avoid using a wedge-shaped intermediate layer with a larger wedge angle, the projection light emitted by the projection device 20 includes P-polarized light, and the proportion of P-polarized light in the projection light is greater than or equal to 80%, preferably greater than or equal to 90%, more preferably greater than or equal to 95%, or even 100% (that is, the projection light is pure P-polarized light). The present application uses P-polarized light for projection, and utilizes the fact that P-polarized light has a low reflectivity when incident on the glass and air interface, especially that basically no reflection occurs when incident at the Brewster angle θB, and the transparent nanofilm can reflect part of the P-polarized light, thereby completely eliminating the visual ghosting phenomenon; compared with traditional head-up display glass that can only be used with S-polarized light projection light, the improved head-up display glass and head-up display system of the present application can meet the usage needs of drivers wearing sunglasses.

[0040] It is understandable that the head-up display glass provided by the present application can also be used with projection light having an incident angle in the range of 38°-85°, which greatly expands the incident angle range of the projection light, so that the projection device 20 can emit projection light to a larger area on the head-up display glass 10, and the projection light can be reflected by the head-up display glass 10 to form an image, and even the projection light emitted by the projection device 20 can be reflected and formed in the entire area of ​​the head-up display glass 10. When the incident angle of the projection light on the head-up display glass 10 is 38° and 85°, the head-up display glass 10 can produce a clear HUD image with the projection light, and has a good display effect.

[0041] See also Figure 3 The head-up display glass 10 includes a laminated glass 11 and a transparent nano-film 12. The laminated glass 11 includes an inner surface 1120 and an outer surface 1100 that are arranged opposite to each other. The inner surface 1120 is the surface facing the interior of the vehicle when the laminated glass 11 is installed in the vehicle 1000, and the transparent nano-film 12 is arranged on the inner surface 1120. Exemplarily, when visible light is vertically incident on the head-up display glass 10, the visible light transmittance of the head-up display glass 10 is greater than or equal to 70%, which meets the regulatory requirements for the front windshield of the vehicle 1000.

[0042] Please refer again Figure 2Depositing the transparent nanofilm 12 on the inner surface 1120 of the laminated glass 11 can increase the reflection of the head-up display glass to P-polarized light, so that when the P-polarized light is incident on the transparent nanofilm 12, it is reflected with a higher reflectivity to form a head-up display main image 201, and the P-polarized light entering the laminated glass is reflected with a lower reflectivity at the junction of the outer surface 1100 of the laminated glass 11 and the air to form a head-up display secondary image 202, and the P-polarized light forming the head-up display secondary image 202 will also be absorbed by the laminated glass and reflected again by the transparent nanofilm 12, further weakening the reflectivity of the head-up display secondary image 202, thereby obtaining a clear HUD image with no visual ghosting and high reflectivity.

[0043] It should be noted that the laminated glass 11 used as the front windshield is usually curved, but the shape of the laminated glass 11 is not limited to the shape described above, and it can be any shape that meets the requirements for the use of vehicle window glass, for example, the laminated glass 11 can also be in the shape of a flat plate, and the embodiments of the present application do not have strict requirements on the shape of the laminated glass 11. Exemplarily, the laminated glass 11 has a vertical curvature radius from the bottom edge to the top edge. In order to facilitate the design and production of the head-up display glass 10, the vertical curvature radius is 4000mm-20000mm.

[0044] The laminated glass 11 includes an outer glass 110, an inner glass 112, and an intermediate layer 111 disposed between the outer glass 110 and the inner glass 112. The surface of the outer glass 110 away from the intermediate layer 111 is the outer surface 1100, and the surface of the inner glass 112 away from the intermediate layer 111 is the inner surface 1120. The transparent nano film 12 is disposed on the inner surface 1120 of the inner glass 112. Exemplarily, the outer glass 110 and the inner glass 112 can be made of transparent glass or tinted glass, such as tinted green glass, tinted gray glass, etc., but the visible light transmittance of the outer glass 110 and the inner glass 112 must be greater than or equal to 70%. The material of the outer glass 110 and the inner glass 112 can include soda-lime silicate glass, borosilicate glass, or aluminosilicate glass, etc. The thickness of the outer glass 110 may be 1.5 mm to 3.5 mm, such as 1.6 mm, 1.8 mm, 2.1 mm, 2.5 mm, 3.0 mm, 3.5 mm, etc. The thickness of the inner glass 112 may be 0.7 mm to 2.5 mm, such as 0.7 mm, 0.9 mm, 1.1 mm, 1.6 mm, 2.1 mm, 2.5 mm, etc. Exemplarily, the thickness of the inner glass 112 is less than that of the outer glass 110. For example, the thickness of the outer glass 110 is at least 0.3 mm greater than that of the inner glass 112. The use of a thinner inner glass 112 may form a laminated glass structure with an asymmetric thickness. On the basis of reducing the total thickness of the head-up display glass to achieve lightweight, the strength of the head-up display glass is improved to a certain extent, and the quality of the head-up display image can be further improved.

[0045] The middle layer 111 is used to connect the outer glass 110 and the inner glass 112, so that the head-up display glass 10 presents a sandwich structure as a whole, so as to improve the safety of the head-up display glass 10 and meet the safety standards and regulatory requirements of vehicle window glass. The material of the middle layer 111 can be polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), thermoplastic polyurethane elastomer (TPU) or ionic polymer film (SGP), etc. Exemplarily, the middle layer 111 can be a single-layer structure or a multi-layer structure, and the multi-layer structure can be exemplified by a double-layer structure, a three-layer structure, a four-layer structure, a five-layer structure, etc. The middle layer 111 can also have other functions, such as setting at least one colored area as a shadow band to reduce the interference of sunlight to the human eye, 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 multi-layer structure has a higher plasticizer content to have a sound insulation function. In order to eliminate ghosting, traditional head-up display glass usually uses a wedge-shaped intermediate layer with a wedge angle of at least 0.3mrad, which makes the design, production and debugging of the head-up display system more difficult. The head-up display glass provided in this application can be directly replaced with an ordinary intermediate layer of equal thickness. It is understandable that the present application may also select a wedge-shaped intermediate layer with a smaller wedge angle, for example, the wedge angle of the wedge-shaped intermediate layer is 0.01 to 0.15 mrad, such as 0.01 mrad, 0.02 mrad, 0.03 mrad, 0.04 mrad, 0.05 mrad, 0.06 mrad, 0.07 mrad, 0.08 mrad, 0.09 mrad, 0.10 mrad, 0.11 mrad, 0.12 mrad, 0.13 mrad, 0.14 mrad, 0.15 mrad, etc., so that the perspective double image generated by the scene in the external environment of the vehicle through the head-up display glass can be further eliminated. The wedge-shaped intermediate layer with a smaller wedge angle can be obtained by a simple stretching process, so that the reflection double image and the perspective double image can be eliminated at the same time in a low-cost manner, and a higher quality head-up display image and observation effect can be obtained. The intermediate layer 111 can be a transparent intermediate layer or a colored intermediate layer, and its visible light transmittance is greater than or equal to 80%, preferably greater than or equal to 85%, and more preferably greater than or equal to 90%. The thickness of the middle layer 111 may be 0.38 mm-1.6 mm, for example, 0.38 mm, 0.5 mm, 0.76 mm, 1.14 mm, 1.52 mm, 1.6 mm, etc.

[0046] See also Figure 4, the transparent nano film 12 includes a high refractive index layer 121 and a low refractive index layer 122. The refractive index of the high refractive index layer 121 is greater than 1.8, preferably greater than or equal to 1.85, and more preferably greater than or equal to 1.9; the refractive index of the low refractive index layer 122 is less than or equal to 1.8, preferably less than or equal to 1.7, and more preferably less than or equal to 1.6. Exemplarily, the transparent nano film 12 includes a first high refractive index layer 121a, a second high refractive index layer 121b, a first low refractive index layer 122a, a third high refractive index layer 121c, and a second low refractive index layer 122b sequentially deposited on the inner surface 1120. Through the design matching of the first high refractive index layer 121a, the second high refractive index layer 121b, the first low refractive index layer 122a, the third high refractive index layer 121c and the second low refractive index layer 122b, the head-up display glass has a reflectivity of at least 13% for P-polarized light incident at an incident angle of 38° to 85°, meeting the requirements of a larger field of view (FOV) and even the requirements of AR-HUD, and can ensure that the optical properties, mechanical properties and appearance color of the transparent nanofilm 12 all meet the comprehensive requirements of vehicle window glass.

[0047] The material of the high refractive index layer 121 includes 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. The high refractive index layer 121 includes a first high refractive index layer 121a, a second high refractive index layer 121b and a third high refractive index layer 121c. Specifically, the refractive indexes of the first high refractive index layer 121a, the second high refractive index layer 121b and the third high refractive index layer 121c are all greater than 1.8, preferably greater than or equal to 1.9. In order to better achieve that the optical properties, mechanical properties and appearance color of the transparent nanofilm 12 meet the comprehensive requirements of the vehicle window glass, the refractive index of the first high refractive index layer 121a is preferably 1.9-2.2, which can be exemplified by 1.9, 2.0, 2.1, 2.2, etc. In order to better achieve that the optical properties, mechanical properties and appearance color of the transparent nanofilm 12 meet the comprehensive requirements of vehicle window glass, the refractive index of the second high refractive index layer 121b and the third high refractive index layer 121c is preferably greater than 2.2, more preferably greater than or equal to 2.3, and even preferably greater than or equal to 2.4, and can be 2.5, 2.65, 2.72, etc. The material of the first high refractive index layer 121a may include zinc tin oxide (ZnSnO x ), magnesium-doped zinc tin oxide (ZnSnMgO x ), titanium-doped zinc tin oxide (ZnSnTiO x ), zirconium-doped zinc tin oxide (ZnSnZrO x ), Silicon Aluminum Nitride (SiAlN x), silicon zirconium nitride (SiZrN x ), Silicon Aluminum Oxynitride (SiAlON x ), silicon zirconium oxynitride (SiZrON x ), Silicon Nitride (SiN x )、ZrO x ), zinc oxide (ZnO x ), aluminum-doped zinc oxide (AZO), hafnium- and aluminum-doped zinc oxide (HAZO), yttrium-doped zinc oxide (YZO), and gallium-doped zinc oxide (GZO). The material of the second high refractive index layer 121b and the material of the third high refractive index layer 121c may include titanium oxide (TiO x ), niobium oxide (Nb2O5), silicon zirconium nitride (SiZrN x ). The value of x can be determined according to whether the magnetron sputtering process is deposited in a stoichiometric, substoichiometric or superstoichiometric manner.

[0048] The material of the low refractive index layer 122 includes at least one of an oxide or nitride or carbide or fluoride of Si, Al, Mg, or Zr. The low refractive index layer 122 includes a first low refractive index layer 122a and a second low refractive index layer 122b. Specifically, the refractive index of the first low refractive index layer 122a and the second low refractive index layer 122b is equal to or less than 1.8, preferably less than or equal to 1.7, more preferably less than or equal to 1.6, and can be exemplified by 1.52, 1.50, 1.47, 1.38, etc. The material of the first low refractive index layer 122a and the material of the second low refractive index layer 122b can include silicon oxide (SiO2), aluminum oxide (Al2O3), magnesium oxide (MgO), and magnesium fluoride (MgF).

[0049] In order to obtain a HUD image with a high reflectance, the head-up display glass 10 of the present application has a reflectivity of at least 13% for P-polarized light incident at an incident angle of 38° to 85°; preferably, the head-up display glass 10 has a reflectivity of at least 16% for P-polarized light incident at an incident angle of 55° to 85°; more preferably, the head-up display glass has a reflectivity of at least 18%, or at least 20%, or at least 22%, or at least 24% for P-polarized light incident at an incident angle of 65°, which helps to realize the commercial application of head-up display glass products.

[0050] In some embodiments, the refractive index of the first high refractive index layer 121a is lower than the refractive index of the second high refractive index layer 121b, and the difference between the refractive index of the first high refractive index layer 121a and the refractive index of the second high refractive index layer 121b is greater than or equal to 0.3, and the difference can be specifically exemplified as 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc. By designing and matching the refractive indices of the first high refractive index layer 121a and the second high refractive index layer 121b, the reflection spectrum of the head-up display glass 10 for P polarized light can be made smoother on the basis of obtaining a HUD image with a high reflectance ratio. Specifically, the reflectivity range of the head-up display glass 10 for P polarized light incident at an incident angle of 65° in the wavelength range of 460nm-630nm is less than or equal to 6%, preferably less than or equal to 5%, more preferably less than or equal to 3%, or even less than or equal to 2%, thereby achieving a color-neutral display of the HUD image as much as possible.

[0051] In some embodiments, the thickness of the first low refractive index layer 122a is 130nm-200nm, the thickness of the third high refractive index layer 121c is 20nm-80nm, and the thickness of the second low refractive index layer 122b is 80nm-130nm; in some embodiments, the thickness of the first high refractive index layer 121a is 25nm-75nm, or 85nm-145nm, or not less than 200nm; in some embodiments, the thickness of the second high refractive index layer 121b is 5nm-35nm, or 80nm-145nm, or 190nm-230nm; by matching the thickness design of the first high refractive index layer 121a, the second high refractive index layer 121b, the first low refractive index layer 122a, the third high refractive index layer 121c and the second low refractive index layer 122b, the HUD image can have a high reflectance, a color-neutral display as much as possible, meet the comprehensive requirements of a larger field of view, and the head-up display glass has an excellent appearance color.

[0052] In some embodiments, the thickness of the first high refractive index layer 121a is 85 nm-145 nm, and the thickness of the second high refractive index layer 121b is 5 nm-35 nm.

[0053] In some embodiments, the thickness of the first high refractive index layer 121a is 85 nm-145 nm, and the thickness of the second high refractive index layer 121b is 190 nm-230 nm.

[0054] In some embodiments, the thickness of the first high refractive index layer 121a is 25 nm to 75 nm, and the thickness of the second high refractive index layer 121b is 80 nm to 145 nm.

[0055] In some embodiments, the thickness of the first high refractive index layer 121a is 25 nm to 75 nm, and the thickness of the second high refractive index layer 121b is 190 nm to 230 nm.

[0056] In some embodiments, the outer glass 110 is tinted glass and / or the middle layer 111 is a tinted middle layer. The tinted glass and the tinted middle layer have more absorption of P-polarized light, which can further reduce the reflectivity of the head-up display secondary image 202 and greatly improve the reflectivity ratio of the head-up display main image 201 and the head-up display secondary image 202.

[0057] Please refer again Figure 2 The present application also provides a head-up display system 100, including a projection device 20 and a head-up display glass 10, the projection device 20 is used to generate projection light including 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 12 at an incident angle of 38° to 85°.

[0058] In some embodiments, the projection light is reflected by the transparent nanofilm 12 to form a head-up display main image 201, and is reflected by the outer surface 1100 to form a head-up display secondary image 202. The ratio of the reflectivity of the head-up display main image 201 to the reflectivity of the head-up display secondary image 202 is greater than 10, so that even if the projection light is incident on the transparent nanofilm 12 at incident angles of 38° and 85°, a clear HUD image can still be obtained, which can meet the use of a larger field of view or even AR-HUD.

[0059] In some embodiments, when the projection light is incident at an incident angle of 55°, a ratio of a reflectivity of the head-up display primary image to a reflectivity of the head-up display secondary image is greater than 480.

[0060] In some embodiments, when the projection light is incident at an incident angle of 65°, a ratio of a reflectivity of the head-up display primary image to a reflectivity of the head-up display secondary image is greater than 45.

[0061] In some embodiments, measured from the outer surface side, the head-up display glass has a Lab value of a reflection color at an incident angle of 65°, wherein the a value is less than or equal to 1 and the b value is less than or equal to 2.5, so that the head-up display glass has an excellent appearance color.

[0062] The projection device 20 is used to output relevant text and image information such as speed, engine speed, fuel consumption, tire pressure, dynamic navigation, night vision, real-view map, etc. to the head-up display glass 10, so that it can be observed by observers in the car, realizing head-up display (HUD) or even augmented reality head-up display (AR-HUD). The projection device 20 is an element known to those skilled in the art, including but not limited to laser, light emitting diode (LED), liquid crystal display (LCD), digital light processing (DLP), electroluminescence (EL), cathode ray tube (CRT), vacuum fluorescent tube (VFD), collimator, spherical correction lens, convex lens, concave lens, reflector and / or polarizer, etc. At the same time, the position and incident angle of the projection device 20 are adjustable to suit observers at different positions or heights in the car.

[0063] In some embodiments, the head-up display glass 10 may further include one or more of an anti-fingerprint film, a heat insulation film, and an electric heating film.

[0064] The anti-fingerprint film can be disposed on the transparent nano film 12 and cover at least a portion of the transparent nano film 12 to prevent fingerprints and the like from contaminating the transparent nano film 12, thereby ensuring a higher quality head-up display.

[0065] The thermal insulation film can be arranged on the surface of the outer glass 110 close to the middle layer 111 and / or the surface of the inner glass 112 close to the middle layer 111. The thermal insulation film can be one or more of a single silver thermal insulation film, a double silver thermal insulation film, a triple silver thermal insulation film, a quadruple silver thermal insulation film or a transparent conductive oxide (TCO) thermal insulation film; wherein, the single silver thermal insulation film, the double silver thermal insulation film, the triple silver thermal insulation film, the quadruple silver thermal insulation film, and the transparent conductive oxide (TCO) thermal insulation film refer to transparent nano thermal insulation films having one silver layer, two silver layers, three silver layers, four silver layers, and a TCO layer, respectively. In addition to the silver layer or the TCO layer, the transparent nano thermal insulation film also includes at least two dielectric layers, and the dielectric layer can be used to protect the silver layer or the TCO layer and adjust the optical properties, appearance color, etc. of the thermal insulation film. The thermal insulation film can make the interior of the vehicle have better riding comfort. The single silver thermal insulation film, double silver thermal insulation film, triple silver thermal insulation film, quadruple silver thermal insulation film, and TCO thermal insulation film can be directly set on the surface of the outer glass 110 close to the middle layer 111 and / or the surface of the inner glass 112 close to the middle layer 111 through a magnetron sputtering deposition process.

[0066] The electric heating film can be arranged on the surface of the outer glass 110 close to the middle layer 111 and / or the surface of the inner glass 112 close to the middle layer 111. The electric heating film can be any one of a double silver electric heating film, a triple silver electric heating film, a quadruple silver electric heating film, and a five silver electric heating film. By arranging at least two busbars in the laminated glass, the current of the power supply can be input into the electric heating film, so that the electric heating film heats up and heats the laminated glass to achieve the functions of defrosting, defogging, and even de-icing and de-snowing, further improving driving safety. Among them, the double silver electric heating film, the triple silver electric heating film, the quadruple silver electric heating film, and the five silver electric heating film refer to transparent nano-conductive films with two silver layers, three silver layers, four silver layers, and five silver layers, respectively. In addition to the silver layer, the transparent nano-conductive film also includes at least two dielectric layers, and the dielectric layer can be used to protect the silver layer and adjust the optical properties, appearance color, etc. of the electric heating film. The electric heating film may be directly disposed on the surface of the outer layer of glass 110 close to the middle layer 111 and / or the surface of the inner layer of glass 112 close to the middle layer 111 by a magnetron sputtering deposition process.

[0067] Comparative Examples 1-3 and Examples 1-6

[0068] An outer layer of glass 110, a middle layer 111 and an inner layer of glass 112 are prepared, wherein the outer layer of glass 110 is 2.1 mm thick tinted green glass, the middle layer 111 is transparent PVB of equal thickness, and the inner layer of glass 112 is transparent glass of 1.6 mm thickness. The transparent nanofilms in Comparative Examples 1-3 and Examples 1-6 are deposited on the inner surface 1120 of the inner layer of glass 112 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 Comparative Examples 1-3 and Examples 1-6.

[0069] Comparative Example 1:

[0070] The transparent nanofilm has a double-layer structure: a TiOx high-refractive index layer with a thickness of 64.8 nm and a SiO2 low-refractive index layer with a thickness of 131.5 nm are sequentially deposited on the inner surface 1120 .

[0071] Comparative Example 2:

[0072] The transparent nanofilm has a three-layer structure: a 45.5nm thick TiOx high refractive index layer, a 25.0nm thick ZnSnOx high refractive index layer, and a 93.0nm thick SiO2 low refractive index layer are sequentially deposited on the inner surface 1120. The refractive index of the TiOx high refractive index layer is greater than that of the ZnSnOx high refractive index layer.

[0073] Comparative Example 3:

[0074] The transparent nanofilm has a four-layer structure: a 10.9 nm thick ZnSnOx high refractive index layer, a 172.4 nm thick SiO2 low refractive index layer, a 63.5 nm thick TiOx high refractive index layer and a 101.3 nm thick SiO2 low refractive index layer are sequentially deposited on the inner surface 1120 .

[0075] Embodiment 1:

[0076] The transparent nanofilm 12 is a five-layer structure: a first high refractive index layer 121a (ZnSnMgOx) with a thickness of 107.6 nm, a second high refractive index layer 121b (TiOx) with a thickness of 18.8 nm, a first low refractive index layer 122a (SiO2) with a thickness of 178.3 nm, a third high refractive index layer 121c (TiOx) with a thickness of 43.3 nm, and a second low refractive index layer 122b (SiO2) with a thickness of 113.2 nm are sequentially deposited on the inner surface 1120. Among them, the refractive index of the first high refractive index layer 121a (ZnSnMgOx) is less than the refractive index of the second high refractive index layer 121b (TiOx).

[0077] Embodiment 2:

[0078] The transparent nanofilm 12 is a five-layer structure: a first high refractive index layer 121a (ZnSnOx) with a thickness of 43.7nm, a second high refractive index layer 121b (TiOx) with a thickness of 93nm, a first low refractive index layer 122a (SiO2) with a thickness of 154.3nm, a third high refractive index layer 121c (TiOx) with a thickness of 49.1nm, and a second low refractive index layer 122b (SiO2) with a thickness of 100nm are sequentially deposited on the inner surface 1120. Among them, the refractive index of the first high refractive index layer 121a (ZnSnOx) is less than the refractive index of the second high refractive index layer 121b (TiOx).

[0079] Embodiment 3:

[0080] The transparent nanofilm 12 is a five-layer structure: a first high refractive index layer 121a (ZnSnOx) with a thickness of 72nm, a second high refractive index layer 121b (TiOx) with a thickness of 199.8nm, a first low refractive index layer 122a (SiO2) with a thickness of 167nm, a third high refractive index layer 121c (TiOx) with a thickness of 28.2nm, and a second low refractive index layer 122b (SiO2) with a thickness of 125.9nm are sequentially deposited on the inner surface 1120. Among them, the refractive index of the first high refractive index layer 121a (ZnSnOx) is less than the refractive index of the second high refractive index layer 121b (TiOx).

[0081] Embodiment 4:

[0082] The transparent nanofilm 12 is a five-layer structure: a first high refractive index layer 121a (ZnSnMgOx) with a thickness of 118nm, a second high refractive index layer 121b (TiOx) with a thickness of 11.9nm, a first low refractive index layer 122a (SiO2) with a thickness of 177.9nm, a third high refractive index layer 121c (TiOx) with a thickness of 52.2nm, and a second low refractive index layer 122b (SiO2) with a thickness of 103.6nm are sequentially deposited on the inner surface 1120. Among them, the refractive index of the first high refractive index layer 121a (ZnSnMgOx) is less than the refractive index of the second high refractive index layer 121b (TiOx).

[0083] Embodiment 5:

[0084] The transparent nanofilm 12 is a five-layer structure: a first high refractive index layer 121a (SiAlNx) with a thickness of 226.9nm, a second high refractive index layer 121b (TiOx) with a thickness of 91.1nm, a first low refractive index layer 122a (SiO2) with a thickness of 161.5nm, a third high refractive index layer 121c (TiOx) with a thickness of 36.6nm, and a second low refractive index layer 122b (SiO2) with a thickness of 114nm are sequentially deposited on the inner surface 1120. Among them, the refractive index of the first high refractive index layer 121a (SiAlNx) is less than the refractive index of the second high refractive index layer 121b (TiOx).

[0085] Embodiment 6:

[0086] The transparent nanofilm 12 is a five-layer structure: a first high refractive index layer 121a (ZnSnOx) with a thickness of 51.5 nm, a second high refractive index layer 121b (TiOx) with a thickness of 199.8 nm, a first low refractive index layer 122a (SiO2) with a thickness of 167 nm, a third high refractive index layer 121c (TiOx) with a thickness of 28.2 nm, and a second low refractive index layer 122b (SiO2) with a thickness of 125.9 nm are sequentially deposited on the inner surface 1120. Among them, the refractive index of the first high refractive index layer 121a (ZnSnOx) is less than the refractive index of the second high refractive index layer 121b (TiOx).

[0087] The head-up display glass of comparative examples 1-3 and embodiments 1-6 and a projection device are used to form a head-up display system. The projection device generates projection light containing at least 99% of 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 observable by the observer is the clearest. The reflectivity Rp, the primary and secondary image reflectance C, the visible light transmittance TL, the reflected colors a and b, etc. are measured and calculated.

[0088] Reflectivity Rp: From the inner surface side, the reflectivity of the head-up display glass to the projection light incident at 38°, 45°, 55°, 65°, 75°, and 85° is measured and calculated according to ISO9050;

[0089] Reflectivity range: From the inner surface side, measure the maximum reflectivity and minimum reflectivity of the head-up display glass within the wavelength range of 460nm-630nm for the projection light incident at 65 degrees. The difference between the maximum reflectivity and the minimum reflectivity is the reflectivity range;

[0090] Main and secondary image reflectance C: From the inner surface side, the reflectance of the head-up display main image and the head-up display secondary image generated by the projection light incident at 38°, 45°, 55°, 65°, 75°, and 85° are measured and calculated according to ISO9050, and calculated according to "main and secondary image reflectance = reflectance of head-up display main image / reflectance of head-up display secondary image";

[0091] Visible light transmittance TL: calculated according to ISO9050;

[0092] Reflected color a, b: measured from the outer surface side at an incident angle of 65°, based on D65 light source and a 10° field of view, calculated according to the CIE Lab color model. The a value represents the red-green value, and the b value represents the yellow-blue value.

[0093] The measurement results of Comparative Examples 1-3 and Examples 1-2 are included in Table 1.

[0094] Table 1: Measurement results of head-up display glasses of comparative examples 1-3 and embodiments 1-2

[0095]

[0096]

[0097] The measurement results of Examples 3-6 are recorded in Table 2.

[0098] Table 2: Measurement results of head-up display glass of Examples 3-6

[0099]

[0100] It can be seen from Table 1 and Table 2 that Comparative Example 1 adopts a transparent nanofilm with a double-layer structure. At any incident angle in the range of 38°-85°, the reflectivity Rp of Comparative Example 1 is less than the reflectivity Rp of Examples 1-6; in particular, in the range of 55°-75°, the reflectivity Rp of Comparative Example 1 is significantly less than the reflectivity Rp of Examples 1-6; when the incident angles are 38°, 55°, 65° and 75°, respectively, the primary and secondary image reflectance C of Comparative Example 1 are less than 10, less than 480, less than 45, and less than 10, respectively; and the a value of the reflected color of Comparative Example 1 is greater than 1; it can be seen that Comparative Example 1 cannot meet the comprehensive requirements of making the HUD image have high reflectivity, as neutral a display as possible, and a larger field of view, and the head-up display glass of Comparative Example 1 does not have an excellent appearance color.

[0101] Comparative Example 2 adopts a transparent nanofilm with a three-layer structure. At any incident angle in the range of 38°-85°, the reflectivity Rp of Comparative Example 2 is less than the reflectivity Rp of Examples 1-6; in particular, in the range of incident angle of 55°-75°, the reflectivity Rp of Comparative Example 2 is significantly less than the reflectivity Rp of Examples 1-6; when the incident angles are 38°, 55°, 65°, 75°, and 85°, respectively, the primary and secondary image reflectance C of Comparative Example 2 are less than 10, less than 480, less than 45, less than 10, and less than 10, respectively; and the a value of the reflected color of Comparative Example 2 is greater than 2; it can be seen that Comparative Example 2 cannot meet the comprehensive requirements of making the HUD image have high reflectivity, as neutral a display as possible, and a larger field of view, and the head-up display glass of Comparative Example 2 does not have excellent appearance color, and even some measurement results of Comparative Example 2 are worse than those of Comparative Example 1.

[0102] Comparative Example 3 uses a transparent nanofilm with a four-layer structure. At any incident angle in the range of 38°-85°, the reflectivity Rp of Comparative Example 3 is less than the reflectivity Rp of Examples 1-6; when the incident angles are 38°, 55° and 65°, respectively, the primary and secondary image reflectance C of Comparative Example 3 are less than 10, less than 480, and less than 45, respectively; it can be seen that Comparative Example 3 cannot meet the comprehensive requirements of making the HUD image have a high reflectivity, a color-neutral display as much as possible, and a larger field of view.

[0103] The five-layer structure of the transparent nanofilm 12 of Examples 1-6 can meet the comprehensive requirements of making the HUD image have high reflectance, as neutral a color as possible, and a larger field of view, and the head-up display glass 10 of Examples 1-6 has excellent appearance color. Among them, the main and secondary image reflectance C of the head-up display glass of Examples 1, 3, and 5 at an incident angle of 65° are greater than or equal to 60. Among them, the head-up display glass 10 of Examples 1-4 has a reflectivity range of less than or equal to 3% for P polarized light incident at an incident angle of 65° in the wavelength range of 460nm-630nm, and even less than or equal to 2%. Among them, the head-up display glass 10 of Examples 2-4 has an excellent neutral appearance color.

[0104] In the description of this specification, the description with reference to the terms "specific embodiment", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0105] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A head-up display glass, characterized in that: It comprises an outer surface and an inner surface arranged opposite to each other, a transparent nano film capable of reflecting P polarized light is arranged on the inner surface, the transparent nano film is a five-layer structure, the transparent nano film comprises a first high refractive index layer, a second high refractive index layer, a first low refractive index layer, a third high refractive index layer and a second low refractive index layer sequentially stacked on the inner surface, the refractive indexes of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer are greater than 1.8, and the refractive indexes of the first low refractive index layer and the second low refractive index layer are less than or equal to 1.8; The head-up display glass has a reflectivity of at least 13% for P-polarized light incident at an incident angle of 38° to 85°; The head-up display glass can be used with projection light having an incident angle within a range of 38°-85°, the projection light forms a head-up display main image through reflection by the transparent nanofilm, and the projection light forms a head-up display secondary image through reflection by the outer surface, and the ratio of the reflectivity of the head-up display main image to the reflectivity of the head-up display secondary image is greater than 10; The thickness of the second high refractive index layer is 5nm-35nm, or the thickness of the second high refractive index layer is 80nm-145nm, or the thickness of the second high refractive index layer is 190nm-230nm.

2. The head-up display glass according to claim 1, characterized in that: The refractive index of the first high refractive index layer is lower than that of the second high refractive index layer, and the difference between the refractive index of the first high refractive index layer and the second high refractive index is greater than or equal to 0.

3.

3. The head-up display glass according to claim 1, characterized in that: The head-up display glass has a reflectivity of at least 16% for P-polarized light incident at an incident angle of 55° to 85°.

4. The head-up display glass according to claim 1, characterized in that: The head-up display glass has a reflectivity of at least 18% for P-polarized light incident at an incident angle of 65°.

5. The head-up display glass according to claim 4, characterized in that: The head-up display glass has a reflectivity range of less than or equal to 6% for P-polarized light incident at an incident angle of 65° within a wavelength range of 460nm-630nm.

6. The head-up display glass according to any one of claims 1 to 5, characterized in that: The thickness of the first low refractive index layer is 130nm-200nm, the thickness of the third high refractive index layer is 20nm-80nm, and the thickness of the second low refractive index layer is 80nm-130nm.

7. The head-up display glass according to any one of claims 1 to 5, characterized in that: The thickness of the first high refractive index layer is 25nm-75nm, or the thickness of the first high refractive index layer is 85nm-145nm, or the thickness of the first high refractive index layer is greater than or equal to 200nm.

8. The head-up display glass according to any one of claims 1 to 4, characterized in that: The thickness of the first high refractive index layer is 85nm-145nm, and the thickness of the second high refractive index layer is 5nm-35nm.

9. The head-up display glass according to any one of claims 1 to 4, characterized in that: The thickness of the first high refractive index layer is 85nm-145nm, and the thickness of the second high refractive index layer is 190nm-230nm.

10. The head-up display glass according to any one of claims 1 to 4, characterized in that: The thickness of the first high refractive index layer is 25 nm-75 nm, and the thickness of the second high refractive index layer is 80 nm-145 nm.

11. The head-up display glass according to any one of claims 1 to 4, characterized in that: The thickness of the first high refractive index layer is 25 nm-75 nm, and the thickness of the second high refractive index layer is 190 nm-230 nm.

12. The head-up display glass according to any one of claims 1 to 4, characterized in that: The head-up display glass includes laminated glass, which includes an outer layer of glass, an inner layer of glass and an intermediate layer arranged between the outer layer of glass and the inner layer of glass, the surface of the outer layer of glass away from the intermediate layer is the outer surface, the surface of the inner layer of glass away from the intermediate layer is the inner surface, the outer layer of glass is tinted glass and / or the intermediate layer is a tinted intermediate layer, and the visible light transmittance of the head-up display glass is greater than or equal to 70%.

13. The head-up display glass according to any one of claims 1 to 4, characterized in that: The head-up display glass also includes one or more of an anti-fingerprint film, a heat insulation film, and an electric heating film.

14. A head-up display system, characterized in that: It comprises a projection device and a head-up display glass as described in any one of claims 1 to 13, 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°.

15. The head-up display system according to claim 14, characterized in that: When the projection light enters the head-up display glass at an incident angle of 55°, a ratio of a reflectivity of the head-up display primary image to a reflectivity of the head-up display secondary image is greater than 480.

16. The head-up display system according to claim 14, characterized in that: When the projection light enters the head-up display glass at an incident angle of 65°, a ratio of a reflectivity of the head-up display primary image to a reflectivity of the head-up display secondary image is greater than 45.

17. The head-up display system according to claim 14, characterized in that: When light is incident on the head-up display glass at an incident angle of 65° measured from the outer surface, based on a D65 light source, the a value in the Lab value of the reflected color of the head-up display glass is less than or equal to 1, and the b value is less than or equal to 2.5.

Images