Head-up display system

Abstract

The present application relates to a head-up display system, comprising a laminated glass (10) and a projection device (20), the laminated glass (10) comprising an outer glass sheet (101), a thermoplastic interlayer (103) and an inner glass sheet (102), the laminated glass (10) having a first head-up display area (110) and a second head-up display area (120), the projection device (20) capable of generating a first polarization (P1) and a second polarization (P2), the first polarization (P1) comprising at least about 70% P-polarized light and the second polarization (P2) comprising at least about 70% P-polarized light.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application filed on November 30, 2021, with application number 202111445611.3, entitled "Head-Up Display System," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of head-up displays, and in particular to head-up display systems. [Background technology]

[0003] A head-up display (HUD) is a driver-centered, blind-operated, multi-function instrument panel that projects important driving information such as speed and navigation onto the windshield in front of the driver, allowing the driver to see important driving information such as speed and navigation without having to lower or turn their head or take their eyes off the road, thereby improving driving safety.

[0004] The appropriate incidence angle for a traditional HUD generally does not exceed 70°. However, with the development of HUD technology, more technologies, such as augmented reality head-up displays (AR-HUDs), have emerged. AR-HUDs require a larger incidence angle range to project larger display image sizes and meet the demand for a larger field of view (FOV). As the incidence angle increases, the ghosting problem in the projection image of the head-up display becomes more serious and more difficult to solve. Traditional HUD systems cannot meet the large projection size demands of AR-HUDs. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, the embodiments of the present application provide a head-up display system, the technical solutions of which are as follows: [Means for solving the problem]

[0006] A head-up display system including a laminated glass and a projection device, the laminated glass includes an outer glass sheet, a thermoplastic intermediate layer, and an inner glass sheet, the thermoplastic intermediate layer being bonded between the outer glass sheet and the inner glass sheet; the laminated glass has a first head-up display area and a second head-up display area, the first head-up display area having a visible light transmittance of about 60% or more, and the second head-up display area having a visible light transmittance of about 30% or less; the projection device is capable of generating a first polarization and a second polarization, the first polarization comprising at least about 70% P polarization and the second polarization comprising at least about 70% P polarization; the first polarized light is incident on the first head-up display area at an incident angle α of approximately 45° to 70°, the first head-up display area having a first reflectivity of at least approximately 15% for P-polarized light incident at 65° and used to display a first head-up display image; The second polarized light is incident on the second head-up display area at an incident angle β of approximately 60° to 85°, and the second head-up display area has a second reflectivity of at least approximately 10% for P polarized light incident at approximately 65° and is used to display a second head-up display image.

[0007] In some embodiments, the outer glass pane has a first surface and a second surface, the inner glass pane has a third surface and a fourth surface, and the thermoplastic intermediate glass pane has a second surface and a third surface. layer is adhered between the second surface and the third surface, the first head-up display area has a first reflective film, the first reflective film being located on the second surface, the third surface, or the fourth surface; the second head-up display area has a second reflective film, the second reflective film being located on the second surface, the third surface, or the fourth surface; The first reflective film and the second reflective film are made of the same material or different materials.

[0008] In some embodiments, the second head-up display area further comprises a visible light barrier layer, the visible light barrier layer being located on the first surface, the second surface, the third surface or the fourth surface, or on at least one surface of the thermoplastic intermediate layer, or within the thermoplastic intermediate layer, and the visible light barrier layer being closer to the first surface than the second reflective film.

[0009] In some embodiments, the extinction coefficient of the material of the visible light barrier layer is k, and the k is about 4.0×10 -6 That's all.

[0010] In some embodiments, the first reflective film is a transparent nano-membrane.

[0011] In some embodiments, the second reflective film is a transparent nano-membrane.

[0012] In some embodiments, the area of ​​the first head-up display area is greater than the area of ​​the second head-up display area.

[0013] In some embodiments, the first head-up display area is located in a central area of ​​the laminated glass, and the second head-up display area is located in a peripheral area of ​​the laminated glass.

[0014] In some embodiments, the virtual image distance of the first head-up display area is between about 7 meters and 100 meters, and the virtual image distance of the second head-up display area is between about 1 meter and 5 meters.

[0015] In some embodiments, the first head-up display area has a visible light transmittance of about 70% or more, and the second head-up display area has a visible light transmittance of about 10% or less.

[0016] In some embodiments, the proportion of P polarized light in the second polarization is less than or equal to the proportion of P polarized light in the first polarization.

[0017] In some embodiments, the brightness of the second polarization is less than or equal to the brightness of the first polarization, the brightness of the second polarization is greater than or equal to about 5000 nits, and the brightness of the first polarization is greater than or equal to about 8000 nits.

[0018] In some embodiments, the R4L(a) of the reflected color of the first head-up display area and the second head-up display area is about 4 or less, and the R4L(b) of the reflected color is about 4 or less.

[0019] In some embodiments, the dimension of the second head-up display area along a direction perpendicular to the bottom edge of the laminated glass is greater than or equal to about 30 cm.

[0020] In some embodiments, the reflectivity of the first head-up display region for P-polarized light in a wavelength range of approximately 460 nm to 630 nm is The difference between the maximum and minimum values ​​( extreme difference ) is within about 4%.

[0021] In some embodiments, the reflectivity of the second head-up display region for P-polarized light in a wavelength range of approximately 460 nm to 630 nm is The difference between the maximum and minimum values ​​( extreme difference ) is within about 4%.

[0022] In some embodiments, the transparent nanofilm is formed by sequentially stacking a high refractive index material and a low refractive index material, the refractive index of the high refractive index material being greater than about 1.8 and the refractive index of the low refractive index material being less than about 1.7, the high refractive index material being a compound containing at least one element selected from the group consisting of Ti, Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, Ta, and rare earth elements, and the low refractive index material being selected from at least one of oxides of Si, nitrogen oxides of Si, carbon oxides of Si, oxides of Al, and mixtures thereof.

[0023] In some embodiments, the outermost layer of the transparent nanofilm is a compound containing at least one of the elements Ti, Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, Ta, and rare earth elements, and the thickness of the outermost layer is about 4.5 nm or more.

[0024] In some embodiments, the transparent nanofilm comprises at least a conductive layer and a dielectric layer, the conductive layer being located between two dielectric layers, and the conductive layer containing at least one metal element selected from the group consisting of Ag, Ni, Cr, Cu, Fe, Mn, Pt, Ti, Zn, Sn, Al, Si, and rare earth elements.

[0025] In some embodiments, the dimension of the second head-up display area along a direction perpendicular to the side edge of the laminated glass is 30 cm or more, or the dimension of the second head-up display area along a direction perpendicular to the top edge of the laminated glass is 30 cm or more. In some embodiments, the material of the visible light barrier layer comprises at least one of an inorganic absorbing material and an organic absorbing material.

[0026] The details of one or more embodiments of the application are set forth below, and other features, objects, and advantages of the application will be apparent from the specification and claims. [Brief explanation of the drawings]

[0027] In order to more clearly explain the technical solutions in the embodiments of the present application or the prior art, the following briefly introduces drawings necessary for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings based on the disclosed drawings without any creative efforts.

[0028] [Figure 1] 1 is a schematic diagram showing a partial structure of a head-up display system according to an embodiment. [Figure 2] 1 is a schematic diagram showing the structure of a laminated glass in one embodiment. [Figure 3]FIG. 2 is a schematic diagram showing the structure of a laminated glass in another example. [Figure 4] FIG. 2 is a schematic diagram showing the structure of a laminated glass in another example. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and are not all embodiments. Based on the embodiments of the present application, all other embodiments that can be obtained by those skilled in the art without any creative efforts fall within the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the specification of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0031] (term) Unless otherwise stated or contradictory, terms or phrases used herein have the following meanings: In the present invention, numerical ranges include the two endpoints of the numerical range unless otherwise specified. In the present invention, a "layer" may be understood as a single layer or a stack of multiple layers. In the present invention, the thickness is the physical thickness. In the present invention, the refractive index is the refractive index at a wavelength of 550 nm for transmitted light. In the present invention, the angle of incidence is the angle between the projection light beam generated by the projection device and the surface normal of the fourth surface of the laminated glass when the projection light beam is incident on the fourth surface. To facilitate the description of the reflective performance of the laminated glass, the reflectance of P-polarized light described in the present invention is calculated in accordance with ISO 9050 by measuring the reflectance spectrum of P-polarized light of the laminated glass at a predetermined incident angle using a Cary 7000.

[0032] In the present invention, the main symbols and their meanings are as follows: Rp(HT) indicates the reflectance of P-polarized light (in accordance with ISO9050) measured at the first head-up display area, which is the measurement position from the inner glass plate side of the laminated glass (i.e., the fourth surface), when the incident angle is 65°. Rp(LT) indicates the reflectance of P-polarized light (in accordance with ISO9050) measured at the second head-up display area, which is the measurement position from the inner glass plate side of the laminated glass (i.e., the fourth surface), when the incident angle is 65°. RL(HT) indicates the visible light reflectance measured at the first head-up display area, which is the measurement position from the inner glass sheet side of the laminated glass (i.e., the fourth surface). RL(LT) indicates the visible light reflectance measured at the second head-up display area, which is the measurement position from the inner glass sheet side of the laminated glass (i.e., the fourth surface). TL(HT) indicates the integrated visible light transmittance (in accordance with ISO 9050) measured at the first head-up display area, which is the measurement position, from the outer glass sheet side (i.e., the first surface) of the laminated glass, when light is normally incident. TL(LT) indicates the integrated visible light transmittance (in accordance with ISO9050) measured at the second head-up display area, which is the measurement position from the outer glass sheet side (i.e., the first surface) of the laminated glass, when light is normally incident. R4L(a) denotes the red-green value of a visible light color based on the CIE 1976, D65 illuminant at a given angle of incidence. R4L(b) denotes the yellow-blue value of the color of visible light based on the CIE 1976, D65 illuminant at a given angle of incidence.

[0033] In response to the demand for large-size projection and solving the ghost problem of projected image, the present invention provides a head-up display system.

[0034] In one embodiment, as shown in FIG. 1, the head-up display system includes a laminated glass 10 and a projection device 20, and the laminated glass 10 has a first head-up display area 110 and a second head-up display area 120.

[0035] The projection device 20 is used to output relevant text and image information, such as speed, engine RPM, fuel economy, tire pressure, dynamic navigation, night vision, and real-world maps, onto the laminated glass 10 for viewing by an observer 01 inside the vehicle, thereby realizing a head-up display (HUD) and, ultimately, an augmented reality head-up display (AR-HUD). The projection device 20 is a device known to those skilled in the art, including, but not limited to, a laser, a light-emitting diode (LED), a liquid crystal display (LCD), a digital light processing (DLP), an electroluminescence (EL), a cathode ray tube (CRT), a vacuum fluorescent display (VFD), a collimator lens, a spherical correction lens, a convex lens, a concave lens, a reflector, and / or a polarizer. The position and incident angle of the projection device 20 can be adjusted to accommodate observers 01 at different positions or heights inside the vehicle.

[0036] Furthermore, the projection device 20 may include multiple sub-projection devices, such as a sub-projection device for projecting a first polarized light P1 and a sub-projection device for projecting a second polarized light P2, where the projection device 20 can generate the first polarized light P1 and the second polarized light P2, where the first polarized light P1 contains at least about 70% P-polarized light and the second polarized light P2 contains at least about 70% P-polarized light. It can be understood that the projection device 20 may be a single projection device, and the internal optical path design can be used to simultaneously project the first polarized light P1 and the second polarized light P2.

[0037] In the present invention, the visible light transmittance TL(HT) of the first head-up display area 110 is about 60% or more, and the visible light transmittance TL(LT) of the second head-up display area 120 is about 30% or less.

[0038] In the present invention, the first polarized light P1 is incident on the first head-up display area 110 at an incident angle α of approximately 45° to 70°, and the reflectance Rp(HT) of the P polarized light of the first head-up display area 110 is approximately 15% or more, and is used to display the first head-up display image.

[0039] In the present invention, the second polarized light P2 is incident on the second head-up display area 120 at an incident angle β of approximately 60° to 85°, and the reflectance Rp(LT) of P-polarized light of the second head-up display area 120 is approximately 10% or more and is used to display the second head-up display image.

[0040] The head-up display system of the present invention can reflect light projected at a large incident angle, display high brightness images, and suppress the ghosting problem.

[0041] Optionally, the first head-up display area 110 may have a different area than the second head-up display area 120 and may display different content. In some embodiments, The area of ​​the first head-up display area 110 is larger than that of the second head-up display area 120, so that the content displayed in the first head-up display area 110 is more comprehensive and convenient for the driver to observe, and can display information such as dynamic navigation, real-world maps, etc. The second head-up display area 120 can display only necessary driving safety information, such as vehicle speed, fuel efficiency, and rearview mirror content.

[0042] Optionally, the first head-up display area 110 is at a different location than the second head-up display area 120 . In some embodiments, The first head-up display area 110 is located in the central area of ​​the laminated glass, and the second head-up display area 120 is located in the peripheral area of ​​the laminated glass.

[0043] As can be appreciated, the peripheral region of the laminated glass includes a top region, a side region, and a bottom region.

[0044] In some embodiments, The second head-up display area 120 is located at the bottom edge of the laminated glass, which ensures driving safety and meets the standard requirements for automobile windshields.

[0045] Furthermore, in the present invention, in order to meet the projection demands of the second head-up display area 120, the dimension (width) of the second head-up display area 120 along the direction perpendicular to the bottom edge of the laminated glass is about 30 cm or more.

[0046] Furthermore, the dimension (width) of the second head-up display area 120 along a direction perpendicular to the side edge of the laminated glass is 30 cm or more. The dimension (width) of the second head-up display area 120 along a direction perpendicular to the top edge of the laminated glass may be approximately 30 cm or more.

[0047] As can be seen, the projection device 20 can generate various angles of polarization, such that a first polarization P1 is incident on the first head-up display area 110 at an angle of incidence α of about 45° to 70°, and a second polarization P 2 is incident on the second head-up display area 120 at an incident angle β of approximately 60° to 85°.

[0048] Optionally, the first head-up display area 110 and the second head-up display area 120 have a different virtual image distance VID. In some embodiments, The virtual image distance VID1 of the first head-up display area 110 is about 7 meters to 100 meters, thereby realizing a large-sized image display of the AR-HUD. 2is about 1 meter to 5 meters, thereby fusing the Augmented Reality Head-Up Display (AR-HUD) and the Windshield Head-Up Display (W-HUD) to simultaneously perform dynamic and static display. Optionally, the distance of VID1 can be varied and adjusted, including but not limited to automatically adjusting VID1 to, for example, about 7 meters to 50 meters based on road conditions to achieve dynamic display of AR-HUD images.

[0049] The first head-up display area 110 is necessary for driving safety, so the visible light transmittance TL(HT) of the first head-up display area 110 is about 60% or more. fruit In an embodiment, TL(HT) is greater than or equal to about 70%, thereby meeting the safety standard requirements for automotive glass.

[0050] The visible light transmittance TL(LT) of the second head-up display area 120 is about 30% or less, which is necessary to suppress high-angle ghosting. A lower visible light transmittance of the second head-up display area 120 contributes to suppressing ghosting and improving the contrast of the second head-up display image. In addition, a lower visible light transmittance of the second head-up display area 120 contributes to a larger application range of the incident angle β of the second polarized light P2, thereby enabling large-sized incident angle projection of the HUD. In some embodiments, TL(LT) is about 30% or less, and in some fruit In the example, TL(LT) is about 10% or less, and fruit In the example, TL (LT) is approximately 5% or less, and some fruit In the example, TL(LT) is about 2% or less, and fruit In an embodiment, TL(LT) is about 1% or less.

[0051] In the present invention, the incident angle α at which the projection device 20 projects onto the first head-up display area 110 is an angle or angle range between about 45° and 70°. In some embodiments,, α is an angle or range of angles between about 50° and 70°. In some embodiments, , α is an angle or range of angles between about 55° and 68°. In some embodiments, , α is an angle or range of angles between about 50° and 65°.

[0052] In the present invention, the projection device 20 is adapted to project onto the second head-up display area 120, and the incident angle β required to suppress high-angle ghosting is an angle or angle range between approximately 60° and 85°. The advantage of the second head-up display area 120, which can suppress ghosting, especially high-angle ghosting, can be fully utilized. For example, when the incident angle is approximately 70° or more, a high-contrast display image can be realized by projecting onto the second head-up display area 120, while suppressing ghosting. In some embodiments, , β is equal to or greater than about 68°; In some embodiments, , β is about 70° or more, In some embodiments, , β is about 75° or more.

[0053] In the present invention, the first polarization projected by the projection device 20 contains at least about 70% P polarization, and the second polarization projected by the projection device 20 contains at least about 70% P polarization, which is advantageous for suppressing ghosting. In some embodiments, , the first polarization comprises at least about 90% P polarization, and the second polarization comprises at least about 90% P polarization. In some embodiments, The first polarization comprises approximately 100% P-polarized light, and the second polarization comprises approximately 100% P-polarized light, thus contributing to HUD projection and reducing the complexity of the projection device.

[0054] Considering the power consumption saving by matching the projection device 20 with the design of the first head-up display area 110 and the second head-up display area 120, ,beforeThe proportion of P-polarized light in the second polarization is equal to or less than the proportion of P-polarized light in the first polarization, e.g., the first polarization includes about 100% P-polarized light and the second polarization includes about 70% P-polarized light and about 30% S-polarized light, or the second polarization includes about 80% P-polarized light and about 20% S-polarized light, or the second polarization includes about 90% P-polarized light and about 10% S-polarized light.

[0055] Considering that the projection device 20 is matched with the design of the first head-up display area 110 and the second head-up display area 120 to save power consumption, ,before The brightness of the second polarization is less than or equal to the brightness of the first polarization, the brightness of the second polarization is greater than or equal to about 5000 nits, and the brightness of the first polarization is greater than or equal to about 8000 nits. For example, the brightness of the first polarization is about 15000 nits and the brightness of the second polarization is about 12000 nits, or the brightness of the second polarization is about 10000 nits, or the brightness of the second polarization is about 8000 nits, or the brightness of the second polarization is about 5000 nits.

[0056] To obtain high-brightness images and suppress ghosting, in the present invention, the reflectance Rp(HT) of the first head-up display area 110 for P-polarized light incident at an angle of about 65° is about 15% or more. The reflectance Rp(LT) of the second head-up display area 120 for P-polarized light incident at an angle of about 65° is about 10% or more. In some embodiments, , Rp(LT) is about 15% or more, In some embodiments, , Rp(LT) is about 20% or more, which is advantageous for obtaining a clear image.

[0057] The structure and materials of the laminated glass are designed to ensure that the reflectance Rp(HT) of the first head-up display area 110 for P-polarized light incident at approximately 65° is approximately 15% or more, and the reflectance Rp(LT) of the second head-up display area 120 for P-polarized light incident at approximately 65° is approximately 10% or more.

[0058] FIG. 2 is a schematic diagram showing the structure of a laminated glass 10 according to an embodiment. The laminated glass 10 includes an outer glass sheet 101, a thermoplastic intermediate layer 103, and an inner glass sheet 102. The outer glass sheet has a first surface 1011 and a second surface 1012. The inner glass sheet has a third surface 1021 and a fourth surface 1022. The thermoplastic intermediate layer 103 is bonded between the second surface 1012 and the third surface 1021.

[0059] The first head-up display area 110 has a first reflective film 104, and the second head-up display area 120 has a second reflective film 105. In this embodiment, the first reflective film 104 and the second reflective film 105 are made of the same material and are both located on the third surface 1021, so only one plating step is required, which makes the process simple and easy to implement.

[0060] In some embodiments, The first reflective film 104 and the second reflective film 105 may be independently positioned on the second surface 1012, the third surface 1021, or the fourth surface 1022. The materials of the two may be different, thereby realizing a wider variety of products and meeting different functional needs. For example, the first reflective film 104 and the second reflective film 105 may be made of different materials, and the first reflective film 104 may be positioned on the second surface 1012, and the second reflective film 105 may be positioned on the fourth surface 1022.

[0061] Optionally, the number of the first reflective films 104 in the first head-up display area 110 is at least 1, and the number of the second reflective films 104 in the second head-up display area 120 is at least 1. 105 The number of is at least 1.

[0062] Optionally, the first reflective film 104 and / or the second reflective film 105 is a transparent nano-film. In this embodiment, both the first reflective film 104 and the second reflective film 105 are transparent nano-films. The transparent nano-film can be formed by sequentially laminating a high refractive index material and a low refractive index material. The refractive index of the high refractive index material is greater than about 1.8, and the refractive index of the low refractive index material is less than about 1.7. The high refractive index material is a compound containing at least one element among Ti, Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, Ta, rare earth elements, etc. In some embodiments, It is a compound having resistance to acid and base, such as SiN, ZnSnO x ZnSnMgO x TiO x including, but not limited to, SiZrN, ZrN, etc. The low refractive index material is selected from at least one of oxides of Si, oxynitrides of Si, oxycarbides of Si, oxides of Al, and mixtures thereof. For example, a mixture of SiO2 and SiO x N y SiAlO x porous Al2O3, porous SiO2, etc. Optionally, the low refractive index material can include one or more of other metal elements and their compounds and mixtures. The metal elements include, but are not limited to, Zr, Nb, Ti, Sb, Sn, Zn, In, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, Ta, rare earth elements, etc. For example, the oxide of Si contains one or more of ZrO2, SiN, MoO2, Y2O3. Furthermore, the mass percentage of the metal element in the oxide of Si is 30% or less. For example, if the oxide of Si contains MgO, then the mass of MgO / (the mass of the oxide of Si + the mass of MgO) is about 30% or less. When the mass percentage of the metal element exceeds about 30%, it becomes difficult to obtain a low refractive index material with a refractive index of about 1.6 or less. Therefore, the mass percentage of the metal element does not exceed about 30%. In some embodiments, The mass percentage of the metal element exceeds about 10%. In addition, the range of the value of x is about 1 < x ≦ 2, and the range of the value of y is about 1 < y ≦ 2.

[0063] To meet the aesthetic requirements of HUD, the inner glass plate From the perspective To avoid red / yellow In some embodiments, The R4L(a) of the reflected color of the first head-up display area and the second head-up display area is about 4 or less, and the R4L(b) of the reflected color is about 4 or less. This contributes to preventing the inner glass plate side from becoming red / yellow. However, some transparent nano-films have difficulty achieving the above objective, assuming that the Rp(HT) and Rp(LT) and the corresponding spectrum are smooth by simply adjusting the thickness of the film system. Therefore, In some embodiments, The outermost layer of the transparent nanofilm is a compound containing at least one element selected from the group consisting of Ti, Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, Ta, and rare earth elements. In some embodiments, , compounds that are resistant to acids and bases, such as SiN, ZnSnO x , ZnSnMgO x , TiO x The outermost layer may have a thickness of about 4.5 nm or more, and the thickness of the outermost layer may be about 4.5 nm or more, but is not limited to the thickness of the inner glass plate side. From the perspective It becomes difficult to prevent the color from turning red / yellow.

[0064] Furthermore, the transparent nanofilm includes at least a conductive layer and a dielectric layer, and the conductive layer is located between two dielectric layers, and the conductive layer contains at least one metal element selected from the group consisting of Ag, Ni, Cr, Cu, Fe, Mn, Pt, Ti, Zn, Sn, Al, Si, and rare earth elements; for example , Ag, or an Ag alloy. The dielectric layer contains at least one element selected from the group consisting of Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, Ta, and rare earth elements. In some embodiments, , contains at least oxides of Zn and Sn, and / or contains at least nitride of Si. In some embodiments,The dielectric layer is a single layer, In some embodiments, ZnSnO contains at least two elements, Zn and Sn, with the atomic ratio of Zn to Sn being about 0.4 to 0.6. x ZnSnO using a ceramic target x For example, by using the sputtering method, it is possible to fabricate a ZnSnMgO x ZnSnMgO using ceramic target x Layers can be created.

[0065] Optionally, the second head-up display area further has a visible light barrier layer, which is located on the first surface, the second surface, the third surface or the fourth surface, or on at least one surface of the thermoplastic intermediate layer, or within the thermoplastic intermediate layer, and which is closer to the first surface 1011 than the second reflective film 105.

[0066] As shown in FIG. 2, in this embodiment, the visible light barrier layer 106 is located on the first surface 1011 .

[0067] In another embodiment, the structure of the laminated glass is as shown in Figure 3, and the visible light barrier layer 106 of the second head-up display area 120 is located on the second surface 1012. Specifically, the laminated glass 10 has a first head-up display area 110 and a second head-up display area 120. First head-up display area 110 The laminated glass includes an outer glass sheet 101, a thermoplastic intermediate layer 103, a first reflective film 104, and an inner glass sheet 102, and has a second head-up display area 120 The laminated glass includes an outer glass sheet 101, a visible light barrier layer 106, a thermoplastic intermediate layer 103, a second reflective film 105, and an inner glass sheet 102. The outer glass sheet 101 has a first surface 1011 and a second surface 1012, and the inner glass sheet 102 has a third surface 1021 and a fourth surface 1022.

[0068] In another embodiment, as shown in Figure 4, the visible light barrier layer 106 of the second head-up display area 120 is located inside the thermoplastic interlayer 103. Specifically, the laminated glass 10 has a first head-up display area 110 and a second head-up display area 120. First head-up display area 110 The laminated glass includes an outer glass sheet 101, a thermoplastic intermediate layer 103, a first reflective film 104, and an inner glass sheet 102, and has a second head-up display area 120 The laminated glass includes a laminated outer glass sheet 101, a thermoplastic intermediate layer 103 including a visible light barrier layer 106, a second reflective film 105, and an inner glass sheet 102. The outer glass sheet 101 has a first surface 1011 and a second surface 1012, and the inner glass sheet 102 has a third surface 1021 and a fourth surface 1022.

[0069] Optionally, a visible light barrier layer 106 The number of is at least 1.

[0070] The structure of the laminated glass of the present invention includes, but is not limited to, the configurations listed below. In the first head-up display area, When the first reflective film is located on the second surface, the structure is outer glass sheet / first reflective film / thermoplastic interlayer / inner glass sheet. When the first reflective film is located on the third surface, the structure is outer glass sheet / thermoplastic interlayer / first reflective film / inner glass sheet. When the first reflective coating is located on the fourth surface, the structure is outer glass sheet / thermoplastic interlayer / inner glass sheet / first reflective coating. In the second head-up display area, When the visible light barrier layer is located on the first surface and the second reflective film is located on the second surface, the structure is visible light barrier layer / outer glass sheet / second reflective film / thermoplastic intermediate layer / inner glass sheet. When the visible light barrier layer is located on the first surface and the second reflective film is located on the third surface, the structure is visible light barrier layer / outer glass sheet / thermoplastic intermediate layer / second reflective film / inner glass sheet. When the visible light barrier layer is located on the first surface and the second reflective film is located on the fourth surface, the structure is visible light barrier layer / outer glass sheet / thermoplastic intermediate layer / inner glass sheet / second reflective film, When the visible light barrier layer is located on the second surface and the second reflective film is located on the visible light barrier layer, the structure is outer glass sheet / visible light barrier layer / second reflective film / thermoplastic intermediate layer / inner glass sheet. When the visible light barrier layer is located on the second surface and the second reflective film is located on the third surface, the structure is outer glass sheet / visible light barrier layer / thermoplastic intermediate layer / second reflective film / inner glass sheet. When the visible light barrier layer is located on the second surface and the second reflective film is located on the fourth surface, the structure is outer glass sheet / visible light barrier layer / thermoplastic intermediate layer / inner glass sheet / second reflective film. When the second reflective film is located on the third surface and the visible light barrier layer is located on the second reflective film, the structure is outer glass sheet / thermoplastic intermediate layer / visible light barrier layer / second reflective film / inner glass sheet. When the visible light barrier layer is located on the third surface and the second reflective film is located on the fourth surface, the structure is outer glass sheet / thermoplastic intermediate layer / visible light barrier layer / inner glass sheet / second reflective film. When the visible light barrier layer is located on the fourth surface and the second reflective film is located on the visible light barrier layer, the structure is outer glass sheet / thermoplastic interlayer / inner glass sheet / visible light barrier layer / second reflective film, Or, it is made up of outer glass sheet / thermoplastic intermediate layer + visible light barrier layer / second reflective film / inner glass sheet. Alternatively, it may be configured as outer glass sheet / thermoplastic intermediate layer + visible light barrier layer / inner glass sheet / second reflective film. As can be appreciated, "thermoplastic interlayer + visible light barrier layer" indicates that the visible light barrier layer is located on either surface of the thermoplastic interlayer or within the thermoplastic interlayer, and this structure can be achieved by addition or joining.

[0071] To obtain the second head-up display area, optionally, the extinction coefficient k of the material of the visible light barrier layer is about 4.0×10 -6 More preferably, the extinction coefficient k of the material of the visible light barrier layer is about 1.0×10 -5 More preferably, the extinction coefficient k of the material of the visible light barrier layer is about 1.0×10 -4 More preferably, the k of the material of the visible light barrier layer is 1.0×10 -3 More preferably, the extinction coefficient k of the material of the visible light barrier layer is about 1.0×10 -2 More preferably, the extinction coefficient k of the material of the visible light barrier layer is about 1.0×10 -1 That's all. The larger the extinction coefficient of the material of the visible light barrier layer, the more remarkable the absorption effect, making it easier to obtain the second head-up display area and at the same time contributing to reducing the thickness of the visible light barrier layer. When the extinction coefficient k of the material of the visible light barrier layer is about 4.0 × 10 -6 If it is less than 1000 nm, the thickness of the visible light barrier layer will be too thick, for example, greater than about 2 mm.

[0072] Furthermore, the material of the visible light barrier layer contains at least one of an inorganic absorbing material and an organic absorbing material, for example, the material of the visible light barrier layer contains an inorganic absorbing material, for example, the material of the visible light barrier layer contains an organic absorbing material, for example, the material of the visible light barrier layer contains an inorganic absorbing material and an organic absorbing material.

[0073] Furthermore, the inorganic absorbent material contains at least one of carbon, iron, zirconium, silicon, aluminum, copper, nickel, cobalt, manganese, tungsten, chromium, zinc, tellurium, tin, titanium, or indium. For example, black inorganic absorbent materials include magnetite, carbon black, RuO, NiO, TiO, TiO-Al2O3, iron oxide, complex oxides of the group consisting of Cu-Fe-Mn, Cu-Cr, Cu-Cr-Mn, Cu-Cr-Mn-Ni, Cu-Cr-Fe, and Co-Cr-Fe, titanium black, titanium nitride, titanium oxynitride, etc. A typical carbon black dye is FW200 (Degussa). Further, for example, colored inorganic absorbent materials include iron oxide, chromium oxide, mixed phase oxides, and colored or transparent metal oxides include, for example, TiO2, low valent titanium oxide, titanium oxynitride, Fe2O3, Fe3O4, SnO2, Cr2O3, ZnO, CuO, NiO, and other metal oxides, including (Ti,Cr,Sb)O2, CoAl2O4 (Tenar's Blue), ZnAl2O4 (Linmann Green), (Fe,Cr)2O3, and sulfides such as CdS, including, for example, mica, synthetic mica, talc, sericite, kaolin, glass, or other siliceous materials, which may be present in a homogeneous or continuous layer, either singly or as a mixture of several types.

[0074] Furthermore, the organic absorbing material is at least one selected from aromatic metal complexes, aliphatic metal complexes, aromatic metal complexes, memercaptophenol-based metal complexes, cyanine dyes, methine dyes, naphthoquinone dyes, anthraquinone dyes, metal phthalocyanine complexes, vanadium oxide phthalocyanine, oxycopper phthalocyanine, metal phthalocyanine derivative complexes, olefin functional groups, alcohol functional groups, phenol functional groups, ether functional groups, benzene functional groups, aldehyde functional groups, ketone functional groups, halogenated hydrocarbon functional groups, ester functional groups, carboxylic acid functional groups, azo pigments, anthraquinone pigments, indigo or thioindigo derivatives, diketopyrrolopyrrole pigments, perylene pigments, phthalocyanine pigments, etc. Examples of black absorbing materials include dark azo pigments, perylene black pigments, and aniline black pigments. Red pigments include DPP-Irgazin Rot BO (manufacturer: Ciba), Chinquaisia ​​Margenta RT355D (manufacturer: Ciba), Hostaperm Rot E2B70 (manufacturer: Hoechst-Clariant), Sicotrans Rot L2817 (manufacturer: BASF), carmine red, thioindigo, DC Rot 6 (also known as Lithol Red 13), and DC Rot 33 (also known as Acid Fuchsin).Blue pigments include Hostaperm Blau AFL (manufacturer: Hoechst-Clariant), Irgazin Blau A3RN (manufacturer: Ciba), Paliogen Blau L6470 (manufacturer: BASF), Berlin Blue, and FDC Blau 1 (also known as Bright Blue). Green pigments include Monastral Green 64 Spezial (manufacturer: Zeneca-ICI), Hostapem Gruen 8G (manufacturer: Hoechst-Clariant), and DC Gruen 5 (also known as Alizarin Cyanine Green F).Yellow pigments include Irgazin Gelb 5GTL (manufacturer: Ciba), Irgacolor Gelb 2GLMA (manufacturer: Ciba), FDC Gelb 5 (also known as Tartrazine), and FDC Gelb 6 (also known as Sunset Yellow).

[0075] The inorganic and organic absorbing materials may be present in the coating / film layer / film sheet / gel, etc., either singly or as a mixture of two or more. For example, carbon black may be present in the ink, and NiCrO x can be used as a layer alone. The organic absorbing material can be present in colored PVB or colored EVA. Typical commercially available ink products include black ink, colored ink, infrared heat insulating ink, conductive ink, luminescent ink, high temperature ink, low temperature ink, colored glaze, black glaze, etc. Materials for the visible light barrier layer include, but are not limited to, one or more of black ink for automotive glass, colored ink, infrared heat insulating ink, colored glaze, and black glaze. Typical colored PVBs include colored PVB, blue PVB, black PVB, gray PVB, etc. Typical colored EVAs include colored EVA, blue EVA, black EVA, and gray EVA. In some embodiments, The material of the visible light barrier layer is selected from a PVB film containing carbon black, which contributes to reducing the impact of ordinary ink on the local temperature of the glass during the hot bending process of the outer glass sheet and / or the inner glass sheet, thereby reducing defects such as light distortion of the glass.

[0076] The reflectance spectrum of the P-polarized light corresponding to the Rp(HT) of the present invention is smooth, i.e., at least within a wavelength range of about 460 nm to 630 nm, and the spectral reflectance curve of the P-polarized light measured from the inner glass plate side of the first head-up display area has a corresponding spectral reflectance (based on 100% incident radiation) within a range of about 4%; for example, within about 2%, thereby meeting commercial demand. The "extreme difference" is the difference between the maximum reflectance and the minimum reflectance for P-polarized light in the wavelength range of about 460 nm to 630 nm in the first head-up display area.

[0077] The reflectance spectrum of the P-polarized light corresponding to the Rp(LT) of the present invention is smooth, i.e., at least within a wavelength range of about 460 nm to 630 nm, and the spectral reflectance curve of the P-polarized light measured from the inner glass plate side of the second head-up display area has a corresponding spectral reflectance (based on 100% incident radiation) that is within about 4% of its extreme difference; for example , within about 2%, thereby meeting commercial demand. The "extreme difference" is the difference between the maximum reflectance and the minimum reflectance for P-polarized light in the wavelength range of about 460 nm to 630 nm in the second head-up display area.

[0078] The following description will be further explained with reference to specific examples and comparative examples. Unless otherwise specified, the raw materials used in the following specific examples may be commercially available, and the equipment used may be commercially available unless otherwise specified. Cut .

[0079] (Examples 1 to 3 and Comparative Examples 1 to 3) The projection light source in the head-up display systems of Examples 1 to 3 and Comparative Examples 1 to 3 is an LED-backlit TFT-LCD projector, which further includes multiple reflectors. By adjusting the position of the projector and the angle and incident direction of the emitted light, the display image observed by the observer can be made as clear as possible.

[0080] In Examples 1 to 3 and Comparative Examples 1 to 3, 100% P-polarized light is maintained incident, and projected onto the first head-up display area (HT) and the second head-up display area (LT) in Examples 1 to 3 at incident angles of α=65° and β=75°, respectively, and the ghost effect is observed at the corresponding reflection angles of α=65° and β=75°, respectively. Comparative Example 1

[0081] The 2.1mm thick soda-lime silicate float glass produced by Fuyao Group was used as the substrate. After cutting, edge grinding, cleaning, and drying, it was put into a magnetron sputtering coating line to deposit a 45nm thick ZnSnOx layer, a 52nm thick TiOx layer, a 111nm thick SiO2 layer, and a 5nm thick SiN layer on the entire surface of the substrate, forming a transparent nano-film as a reflective coating. After the coating deposition was completed, the 2.1mm thick soda-lime silicate float glass produced by Fuyao Group was used as the mating substrate and formed using a high-temperature forming process for automotive glass. A 0.76mm thick colorless PVB film was sandwiched between them and the glass was then laminated under high pressure in an autoclave. Example 1

[0082] The 2.1mm thick soda-lime silicate float glass produced by Fuyao Group was used as the substrate. After cutting, edge grinding, cleaning, and drying, it was introduced into a magnetron sputtering coating line for coating deposition. A 45nm thick ZnSnOx layer, a 52nm thick TiOx layer, a 111nm thick SiO2 layer, and a 5nm thick SiN layer were deposited on the entire surface (fourth surface) of the substrate, forming transparent nano-films as the first and second reflective coatings. After coating deposition was completed, the 2.1mm thick soda-lime silicate float glass produced by Fuyao Group was used as the mating substrate and formed using a high-temperature forming process for automotive glass. A 0.76mm thick PVB film was sandwiched between the two and then laminated under high pressure in an autoclave. The PVB film was colorless in the first head-up display area and colored in the second head-up display area (the color PVB film had a 30cm-wide color strip). Comparative Example 2

[0083] The substrate was a 1.8mm thick soda lime silicate float glass produced by the Fuyao Group. After undergoing processes such as cutting, edge polishing, cleaning and drying, it was placed in a magnetron sputtering coating line to perform coating deposition. A 32.5nm thick SiN layer, a 10nm thick AZO layer, a 13.8nm thick Ag layer, a 10nm thick AZO layer, a 77nm thick ZnSnOx layer, a 10nm thick AZO layer, a 5.7nm thick Ag layer, a 10nm thick AZO layer and a 34nm thick SiN layer were deposited on the entire surface of the substrate (the fourth surface), forming a transparent nano-film as a reflective film. After the coating was completed, a 2.1mm thick soda lime silicate float glass produced by Fuyao Group was used as the substrate and molded using the high-temperature molding process for automotive glass. A 0.76mm thick colorless PVB film was then sandwiched between the two and laminated under high pressure in an autoclave. Example 2

[0084] The substrate was a 1.8mm thick soda lime silicate float glass produced by the Fuyao Group. After undergoing processes such as cutting, edge grinding, cleaning and drying, it was placed in a magnetron sputtering coating line to perform coating deposition. A 32.5nm thick SiN layer, a 10nm thick AZO layer, a 13.8nm thick Ag layer, a 10nm thick AZO layer, a 77nm thick ZnSnOx layer, a 10nm thick AZO layer, a 6.2nm thick Ag layer, a 10nm thick AZO layer and a 34nm thick SiN layer were deposited on the entire surface of the substrate (the fourth surface), forming transparent nano-films as the first and second reflective films. After the coating was completed, 2.1mm thick soda lime silicate float glass produced by Fuyao Group was used as the mating substrate. GP265 tempered glass pigment (manufactured by Taoyishiki Glaze Co., Ltd.) was applied to the second head-up display area of ​​the mating substrate (first surface) with a width of 30cm. The mating substrate was sintered at high temperature using the high-temperature forming process used for automotive glass. A 0.76mm thick colorless PVB film was sandwiched between the two and then laminated under high pressure in an autoclave. Comparative Example 3

[0085] The substrate was a 1.1mm thick soda lime silicate float glass produced by the Fuyao Group. After undergoing processes such as cutting, edge polishing, cleaning and drying, it was placed in a magnetron sputtering coating line to deposit a coating. A 5nm thick TiOx layer, a 100nm thick TiSiOx layer and a 110nm thick SiO2 layer were deposited on the entire surface (fourth surface) of the substrate, forming a transparent nano-film as a reflective film. After the coating was completed, the other side (surface 3) of the substrate was treated, washed, dried, and then placed in a magnetron sputtering coating line for coating deposition. A 35nm thick SiN layer, a 10nm thick AZO layer, a 6nm thick Ag layer, a 10nm thick AZO layer, a 91nm thick ZnSnOx layer, a 10nm thick AZO layer, an 11.5nm thick Ag layer, a 10nm thick AZO layer, and a 33.5nm thick SiN layer were sequentially deposited on the entire surface, forming a transparent nano-membrane reflective coating. Fuyao Group's 2.1mm thick soda-lime silicate float glass was used as the substrate, which was formed using a high-temperature forming process for automotive glass. A 0.76mm thick colorless PVB film was sandwiched between the two and then laminated under high pressure in an autoclave. Example 3

[0086] The substrate was a 1.1mm thick soda lime silicate float glass produced by the Fuyao Group. After undergoing processes such as cutting, edge polishing, cleaning and drying, it was placed in a magnetron sputtering coating line to perform coating deposition, depositing a 5nm thick TiOx layer, a 100nm thick TiSiOx layer and a 110nm thick SiO2 layer on the entire surface of the substrate (fourth surface), forming transparent nano-films as the first and second reflective films. After the coating deposition was completed, the other side (third surface) of the substrate was treated and subjected to processes such as cleaning and drying, and then placed in a magnetron sputtering coating line for coating deposition. A 35 nm thick SiN layer, a 10 nm thick AZO layer, a 6 nm thick Ag layer, a 10 nm thick AZO layer, a 91 nm thick ZnSnOx layer, a 10 nm thick AZO layer, an 11.5 nm thick Ag layer, a 10 nm thick AZO layer, and a 33.5 nm thick SiN layer were deposited in this order over the entire surface, forming transparent nano-films as the first and second reflective films. The 2.1mm thick soda lime silicate float glass produced by the Fuyao Group was used as the substrate, and formed using the high-temperature forming process used for automotive glass. A 0.76mm thick colorless PVB film was then sandwiched between the two. A 0.38mm thick, 35cm wide black PVB film was then attached to the second head-up display area on the PVB, and the two were then laminated under high pressure in an autoclave.

[0087] The performance evaluation items and results for Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1.

[0088] [Table 1]

[0089] As can be seen from Table 1, in Comparative Examples 1 to 3, no visible light barrier layer was provided in the second head-up display area, so ghosting in the second head-up display area could not be eliminated. In Examples 1 to 3, a visible light barrier layer was provided in the second head-up display area, so ghosting in the second head-up display area could be eliminated. The present invention not only achieves good head-up display effects in both the first and second head-up display areas, but also ensures that the first head-up display area has high visible light transmittance, and that the second head-up display area has good visible light reflection color, and maintains high P-polarized light reflectance and a smooth reflection spectrum, achieving a polarity difference of less than 4%.

[0090] The technical features of the above embodiments can be combined in any way. For the sake of simplicity, not all possible combinations of the technical features of the above embodiments are described, but as long as there is no contradiction in the combination of these technical features, they should all be considered to be within the scope of the present specification.

[0091] The above examples only represent some embodiments of the present application, and the descriptions are relatively specific and detailed, but this should not be construed as a limitation on the scope of the claims. Those skilled in the art may make minor modifications and improvements without departing from the concept of the present application, and all of these fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent is determined by the appended claims.

Claims

1. A head-up display system including a laminated glass and a projection device, the laminated glass includes an outer glass sheet, a thermoplastic intermediate layer, and an inner glass sheet, the thermoplastic intermediate layer being bonded between the outer glass sheet and the inner glass sheet; the laminated glass has a first head-up display area and a second head-up display area, the first head-up display area having a visible light transmittance of about 60% or more, and the second head-up display area having a visible light transmittance of about 30% or less; the projection device is capable of generating a first polarization and a second polarization, the first polarization comprising at least about 70% P polarization and the second polarization comprising at least about 70% P polarization; the first polarized light is incident on the first head-up display area at an incident angle of approximately 45° to 70°, the first head-up display area having a first reflectivity of at least approximately 15% for P-polarized light incident at 65°, and used to display a first head-up display image; A head-up display system, characterized in that the second polarized light is incident on the second head-up display area at an incident angle of approximately 60° to 85°, and the second head-up display area has a second reflectivity of at least approximately 10% for P polarized light incident at approximately 65°, and is used to display a second head-up display image.

2. the outer glass pane has a first surface and a second surface, the inner glass pane has a third surface and a fourth surface, and the thermoplastic interlayer is adhered between the second surface and the third surface; the first head-up display area has a first reflective film, the first reflective film being located on the second surface, the third surface, or the fourth surface; 2. The head-up display system of claim 1, wherein the second head-up display area has a second reflective film, the second reflective film is located on the second surface, the third surface, or the fourth surface, and the first reflective film and the second reflective film are made of the same or different material.

3. 3. The head-up display system of claim 2, wherein the second head-up display area further comprises a visible light barrier layer, the visible light barrier layer being located on the first surface, the second surface, the third surface or the fourth surface, or on at least one surface of the thermoplastic intermediate layer, or within the thermoplastic intermediate layer, and the visible light barrier layer being closer to the first surface than the second reflective film.

4. The extinction coefficient of the material of the visible light barrier layer is k, and k is approximately 4.0×10 -6 4. The head-up display system according to claim 3, wherein:

5. 3. The head-up display system according to claim 2, wherein the first reflective film is a transparent nano-film and / or the second reflective film is a transparent nano-film.

6. 2. The head-up display system according to claim 1, wherein an area of ​​the first head-up display area is larger than an area of ​​the second head-up display area.

7. 7. The head-up display system according to claim 6, wherein the first head-up display area is located in a central area of ​​the laminated glass, and the second head-up display area is located in a peripheral area of ​​the laminated glass.

8. 2. The head-up display system of claim 1, wherein the virtual image distance of the first head-up display area is approximately 7 meters to 100 meters, and the virtual image distance of the second head-up display area is approximately 1 meter to 5 meters.

9. 2. The head-up display system of claim 1, wherein the visible light transmittance of the first head-up display area is greater than or equal to about 70%, and the visible light transmittance of the second head-up display area is less than or equal to about 10%.

10. 2. The head-up display system of claim 1, wherein a ratio of P-polarized light in the second polarization is equal to or less than a ratio of P-polarized light in the first polarization.

11. 2. The head-up display system of claim 1, wherein the brightness of the second polarization is less than or equal to the brightness of the first polarization, the brightness of the second polarization is greater than or equal to approximately 5000 nits, and the brightness of the first polarization is greater than or equal to approximately 8000 nits.

12. R4L(a) of the reflected color of the first head-up display area and the second head-up display area That is, a* is approximately 4 or less, and the R4L(b) of the reflected color That is, b* 2. The head-up display system of claim 1, wherein: is about 4 or less.

13. The dimension of the second head-up display area along a direction perpendicular to the bottom side of the laminated glass is about 30 cm or more, And / or, the dimension of the second head-up display area along a direction perpendicular to the side edge of the laminated glass is 30 cm or more, and / or the dimension of the second head-up display area along a direction perpendicular to the top edge of the laminated glass is 30 cm or more.

14. 2. The head-up display system of claim 1, wherein the difference between the maximum and minimum values ​​of reflectance for P-polarized light in the wavelength range of approximately 460 nm to 630 nm in the first head-up display area is within approximately 4%, and / or the difference between the maximum and minimum values ​​of reflectance for P-polarized light in the wavelength range of approximately 460 nm to 630 nm in the second head-up display area is within approximately 4%.

15. The transparent nanofilm is formed by sequentially laminating a high refractive index material and a low refractive index material, the refractive index of the high refractive index material being greater than about 1.8, and the refractive index of the low refractive index material being less than about 1.7, the high refractive index material being a compound containing at least one element selected from the group consisting of Ti, Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, Ta, and rare earth elements, and the low refractive index material being selected from at least one of oxides of S, nitrogen oxides of Si, carbon oxides of Si, oxides of Al, and mixtures thereof, and / or the outermost layer of the transparent nanofilm is 6. The head-up display system of claim 5, wherein the outermost layer is a compound containing at least one element selected from the group consisting of Ti, Zr, Nb, Si, Sb, Sn, Zn, In, Al, Ni, Cr, Mg, Mn, V, W, Hf, Ta, Mo, Ga, Y, Bi, Ta, and rare earth elements, and the thickness of the outermost layer is about 4.5 nm or more; and / or the transparent nanofilm includes at least a conductive layer and a dielectric layer, the conductive layer is located between two dielectric layers, and the conductive layer contains at least one metal element selected from the group consisting of Ag, Ni, Cr, Cu, Fe, Mn, Pt, Ti, Zn, Sn, Al, Si, and rare earth elements.

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