Glass for head-up display and head-up display system

Abstract

A head-up display glass (100) and a head-up display system (1000) are provided. The head-up display glass (100) includes a laminated glass and a reflective coating (40). The laminated glass includes an outer glass sheet (10), a polymer interlayer (30), and an inner glass sheet (20). The reflective coating (40) includes a laminated inner barrier layer (41), an improvement layer (42), and at least one laminate structure (43). The inner barrier layer (41) can prevent the improvement layer (42) from being destroyed by alkali metal ions on the glass surface during heat treatment, and prevent the improvement layer (42) from being oxidized by oxygen diffusion. The improvement layer (42) can further improve the reflectance of the reflective coating (40) for P-polarized light, while keeping the reflectance of the reflective coating (40) for visible light low. As a result, when a driver inside a vehicle visually observes a reflected image on the head-up display glass (100), he or she can only observe the reflected image on the reflective coating (40), eliminating the visual ghost phenomenon. In addition, the visible light reflectance of this head-up display glass (100) is 15% or less, so no noticeable reflected shadows are observed inside the vehicle.

Description

[Technical field]

[0001] REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202210282494.1, filed on March 22, 2022, for the invention titled "Glass for Head-Up Display and Head-Up Display System," the entire contents of which are incorporated herein by reference.

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

[0003] With the development of science and technology, head-up display (HUD) systems are increasingly being used in vehicles. The head-up display system of a vehicle can display important driving information, such as speed, engine RPM, fuel consumption, tire pressure, navigation, and information from external smart devices, in real time within the driver's field of vision. This allows the driver to view driving information without lowering his / her head, which helps to avoid distributing the driver's attention to the road ahead. In addition, the driver no longer needs to adjust his / her eyes to observe the road in the distance and the nearby instruments, which helps to avoid eye fatigue, greatly increasing driving safety and improving the driving experience.

[0004] At present, head-up display technology is mainly realized by two methods: light-emitting imaging and projection imaging. Among them, projection imaging is a method of projecting images using the head-up display glass itself or a separately installed optical element. Reflecting the projected image using the head-up display glass is the simplest structure. Since the general head-up display glass is laminated glass, the light from the projection light source of the head-up display system is reflected when passing through the two surfaces of the laminated glass that are in contact with the air, and the reflected images on the two surfaces are misaligned to form two mutually interfering ghost images, which greatly limits the clarity of the projected display image. Summary of the Invention

[0005] An object of the present application is to provide a head-up display glass and a head-up display system capable of displaying a clear image without the ghost phenomenon.

[0006] The present application provides a glass for a head-up display. The glass for a head-up display includes a laminated glass and a reflective coating capable of reflecting P-polarized light. The laminated glass includes an outer glass sheet, a polymer intermediate layer, and an inner glass sheet, and the polymer intermediate layer is sandwiched between the outer glass sheet and the inner glass sheet. The reflective coating includes a laminated internal barrier layer, an improvement layer, and at least one laminated structure, the internal barrier layer is provided on a surface of the inner glass sheet away from the polymer intermediate layer, and the laminated structure includes a high refractive index layer and a low refractive index layer sequentially laminated along a direction away from the internal barrier layer, the refractive index of the high refractive index layer being 1.8 or more, and the refractive index of the low refractive index layer being less than 1.7. The improvement layer is provided between the internal barrier layer and the laminated structure, or the improvement layer is provided between the high refractive index layer and the low refractive index layer.

[0007] The reflectance of the glass for a head-up display for P-polarized light incident at an incident angle θ is Y, where θ satisfies 60°≦θ≦75° and Y satisfies Y≧15%.

[0008] When θ satisfies 65°≦θ≦75°, Y satisfies Y≧20%, and when θ satisfies 70°≦θ≦75°, Y satisfies Y≧27%.

[0009] The reflectance of glass for head-up displays for vertically incident visible light is 15% or less.

[0010] The material of the inner barrier layer includes at least one of oxides of Zn, Sn, Ti, Si, Al, Nb, Zr, Ni, Mg, Cr, and Ta elements and oxides of alloys thereof, or at least one of nitrides of Si, Al, Zr, B, and Ti elements and nitrides of alloys thereof.

[0011] The material of the improvement layer includes at least one of the elements Ni, Cr, Fe, Ti, Mo, Cu, Al, Au, Sn, Zr, In, Si, Nb, Ge, W, Ta, Pd, and Pt, and alloys thereof.

[0012] The element or alloy in the improved layer has a crystal structure, and the improved layer has a thickness of 1 nm to 40 nm.

[0013] The element or alloy in the improved layer has an amorphous structure, and the improved layer has a thickness of 1 nm to 5 nm.

[0014] The reflective coating further includes an outer barrier layer disposed on a surface of the at least one laminate structure remote from the inner barrier layer.

[0015] The material of the outer barrier layer includes at least one of nitrides of the elements Si, Al, Zr, Ti, B, and Ni, and nitrogen oxides of alloys thereof.

[0016] The thickness of the outer barrier layer is 3 nm to 30 nm.

[0017] The refractive index of the inner glass pane and the refractive index of the polymer interlayer differ by no more than 0.1, and the refractive index of the outer glass pane and the refractive index of the polymer interlayer differ by no more than 0.1.

[0018] Among the Lab values ​​of the reflective color of the glass for head-up displays measured from the reflective coating side, the a value ranges from -8 to 3, and the b value ranges from -12 to 0.

[0019] The present application further provides a glass for a head-up display, the glass for a head-up display comprising a laminated glass and a reflective coating capable of reflecting P-polarized light. The laminated glass comprises an outer glass sheet, a polymer interlayer, and an inner glass sheet, the polymer interlayer being sandwiched between the outer glass sheet and the inner glass sheet. The reflective coating comprises a laminated improvement layer and at least one laminate structure, the laminate structure comprising: Inner glass plate The head-up display glass includes a high refractive index layer and a low refractive index layer sequentially laminated along a direction away from the incident light, the high refractive index layer having a refractive index of 1.8 or more and the low refractive index layer having a refractive index of less than 1.7. The head-up display glass has a reflectance Y for P-polarized light incident at an incident angle θ, where θ satisfies 60°≦θ≦75° and Y satisfies Y≧15%.

[0020] The reflective coating further includes an inner barrier layer disposed on a surface of the inner glass pane remote from the polymer interlayer.

[0021] The material of the improved layer has a crystal structure, and the improved layer has a thickness of 1 nm to 40 nm.

[0022] The material of the improved layer has an amorphous structure, and the improved layer has a thickness of 1 nm to 5 nm.

[0023] The material of the improvement layer includes at least one of the elements Ni, Cr, Fe, Ti, Mo, Cu, Al, Au, Sn, Zr, In, Si, Nb, Ge, W, Ta, Pd, and Pt, and alloys thereof.

[0024] Among the Lab values ​​of the reflective color of the glass for head-up displays measured from the reflective coating side, the a value ranges from -8 to 3, and the b value ranges from -12 to 0.

[0025] The present application further provides a head-up display system, comprising a projection light source for generating P-polarized light and the above-mentioned head-up display glass, wherein the P-polarized light is projected onto a reflective coating.

[0026] The present application provides a glass for a head-up display and a head-up display system. By adding an internal barrier layer and an improvement layer to the reflective coating, the internal barrier layer can prevent the improvement layer from being destroyed by alkali metal ions on the glass surface during heat treatment, and can prevent the improvement layer from being oxidized by oxygen diffusion. The improvement layer can further improve the reflectance of the reflective coating for P-polarized light, while keeping the reflectance of the reflective coating for visible light low. Due to the cooperation of the internal barrier layer, the improvement layer, and the laminated structure, the formed reflective coating has a high reflectance for P-polarized light, so that when a driver inside a vehicle observes the reflected image of the glass for a head-up display with his / her eyes, he / she can only observe the reflected image of the reflective coating, and the visual ghost phenomenon is eliminated. In addition, the visible light reflectance of the glass for a head-up display of the present application is 15% or less, and no noticeable reflection is observed inside the vehicle. [Brief description of the drawings]

[0027] In order to more clearly describe the technical solutions of the embodiments of the present application or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings by these drawings without creative efforts. [Figure 1] 1 is a schematic configuration diagram of a vehicle equipped with a head-up display system according to an embodiment of the present application. [Diagram 2] FIG. 2 is a schematic configuration diagram of a head-up display system of the vehicle shown in FIG. [Diagram 3] 3 is a schematic diagram showing a cross-sectional structure of a first embodiment of a head-up display glass in the head-up display system shown in FIG. 2. [Figure 4]FIG. 4 is a schematic configuration diagram of a first example of a reflective coating in the first embodiment of the head-up display glass shown in FIG. 3. [Diagram 5] FIG. 4 is a schematic configuration diagram of a second example of a reflective coating in the first embodiment of the head-up display glass shown in FIG. 3. [Figure 6] FIG. 4 is a schematic configuration diagram of a third example of a reflective coating in the first embodiment of the head-up display glass shown in FIG. 3. [Figure 7] FIG. 4 is a schematic configuration diagram of a fourth example of a reflective coating in the first embodiment of the head-up display glass shown in FIG. [Figure 8] FIG. 4 is a schematic configuration diagram of a fifth example of a reflective coating in the first embodiment of the head-up display glass shown in FIG. 3. [Figure 9] FIG. 4 is a schematic configuration diagram of a sixth example of a reflective coating in the first embodiment of the head-up display glass shown in FIG. [Figure 10] FIG. 4 is a schematic configuration diagram of a first example of a reflective coating in a second embodiment of the head-up display glass shown in FIG. 3. [Figure 11] FIG. 4 is a schematic configuration diagram of a second example of a reflective coating in the second embodiment of the head-up display glass shown in FIG. 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, the technical solutions of the embodiments of the present application will be described clearly and completely with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments that a person skilled in the art can obtain without creative efforts belong to the protection scope of the present application.

[0029] Referring to FIG. 1, FIG. 1 is a schematic configuration diagram of a vehicle 1 equipped with a head-up display system 1000 according to an embodiment of the present application.

[0030] The vehicle 1 includes a head-up display system 1000 and a vehicle body 2000. The head-up display system 1000 is provided in the vehicle body 2000 and is used to display important driving information, such as speed, engine RPM, fuel economy, tire pressure, navigation, and information from an external smart device, in the driver's field of vision in real time.

[0031] Referring to FIG. 2, FIG. 2 is a schematic configuration diagram of the head-up display system 1000 of the vehicle 1 shown in FIG.

[0032] The head-up display system 1000 includes a head-up display glass 100 and a projection light source 200. The head-up display glass 100 is mounted on a vehicle body 2000, and the projection light source 200 is located inside the vehicle body 2000. The head-up display glass 100 has a first side surface 101 and a second side surface 102 that face each other. When the head-up display glass 100 is mounted on a vehicle, the first side surface 101 faces the exterior of the vehicle, and the second side surface 102 faces the interior of the vehicle.

[0033] The projection light source 200 is mounted inside the vehicle and is used to generate P-polarized light. The P-polarized light is projected onto the second-side surface 102 of the head-up display glass 100 facing the inside of the vehicle. Some of the P-polarized light is incident on the second-side surface 102 at an incident angle θ and is reflected by the second-side surface 102, and some of the P-polarized light passes through the head-up display glass 100 to reach the first-side surface 101 and is reflected by the first-side surface 101. Since the second-side surface 102 of the head-up display glass 100 facing the inside of the vehicle has a relatively high P-polarized light reflectance and the first-side surface 101 facing the outside of the vehicle has a relatively low P-polarized light reflectance, when a driver in the vehicle visually observes the reflected image (HUD image) of the head-up display glass 100, only the reflected image of the second-side surface 102 is observed, and the visual ghost phenomenon is eliminated.

[0034] Here, the projection light source 200 generating P-polarized light can be understood to mean that the projection light generated by the projection light source 200 contains at least 80% P-polarized light. The higher the proportion of P-polarized light in the projection light, the brighter and clearer the head-up display image will be, and the easier it is to eliminate the visual ghost phenomenon. The projection light generated by the projection light source 200 preferably contains at least 90% P-polarized light, and more preferably contains 100% P-polarized light, i.e., the projection light is essentially pure P-polarized light.

[0035] Referring to Fig. 3, Fig. 3 is a schematic diagram showing a cross-sectional structure of a first embodiment of the head-up display glass 100 in the head-up display system 1000 shown in Fig. 2. For convenience of explanation, the thickness direction of the head-up display glass 100 shown in Fig. 2 is defined as the X-axis direction.

[0036] The head-up display glass 100 includes a laminated glass and a reflective coating 40 capable of reflecting P-polarized light. The laminated glass includes an outer glass plate 10, a polymer interlayer 30, and an inner glass plate 20, in that order along the X-axis direction, with the polymer interlayer 30 sandwiched between the outer glass plate 10 and the inner glass plate 20.

[0037] The outer glass sheet 10 has a first surface 11 and a second surface 12. The first surface 11 and the second surface 12 are disposed opposite each other. The second surface 12 faces the polymer interlayer 30. The first surface 11 is an interface between the outer glass sheet 10 and the air, i.e., a surface 101 on the first side of the head-up display glass 100. The inner glass sheet 20 has a third surface 21 and a fourth surface 22. The third surface 21 and the fourth surface 22 are disposed opposite each other. The third surface 21 faces the polymer interlayer 30. The fourth surface 22 faces away from the polymer interlayer 30. In one embodiment, the difference between the refractive index of the outer glass sheet 10 and the refractive index of the polymer interlayer 30 is 0.1 or less, and the difference between the refractive index of the inner glass sheet 20 and the refractive index of the polymer interlayer 30 is 0.1 or less.

[0038] The reflective coating 40 is provided on the fourth surface 22 of the inner glass plate 20. When the head-up display glass 100 is installed in a vehicle, the reflective coating 40 faces the inside of the vehicle. The surface of the reflective coating 40 away from the fourth surface 22 is the second side surface 102. Since the reflectance of the reflective coating 40 is relatively high for the P-polarized light emitted from the projection light source 200 and the P-polarized light reflectance of the first surface 11 of the outer glass plate 10 is relatively low, the visual ghost phenomenon is eliminated.

[0039] In this embodiment, the reflectance of the head-up display glass 100 for P-polarized light incident at an incident angle θ is defined as Y. In one embodiment, when 60°≦θ≦75°, Y≧15%. In another embodiment, when 65°≦θ≦75°, Y≧20%. In another embodiment, when 70°≦θ≦75°, Y≧27%.

[0040] Referring to Figs. 4 to 9, Fig. 4 is a schematic diagram of a first example of the reflective coating 40 in the first embodiment of the glass for head-up display 100 shown in Fig. 3. Fig. 5 is a schematic diagram of a second example of the reflective coating 40 in the first embodiment of the glass for head-up display 100 shown in Fig. 3. Fig. 6 is a schematic diagram of a third example of the reflective coating 40 in the first embodiment of the glass for head-up display 100 shown in Fig. 3. Fig. 7 is a schematic diagram of a fourth example of the reflective coating 40 in the first embodiment of the glass for head-up display 100 shown in Fig. 3. Fig. 8 is a schematic diagram of a fifth example of the reflective coating 40 in the first embodiment of the glass for head-up display 100 shown in Fig. 3. Fig. 9 is a schematic diagram of a sixth example of the reflective coating 40 in the first embodiment of the glass for head-up display 100 shown in Fig. 3. The positive direction of the X-axis shown in the drawings is a direction away from the inner barrier layer 41.

[0041] In a first embodiment, the reflective coating 40 includes an internal barrier layer 41, an improvement layer 42, and at least one laminated structure 43. The internal barrier layer 41 is provided on the fourth surface 22 of the inner glass sheet 20. The internal barrier layer 41 and the laminated structure 43 are laminated in a direction away from the internal barrier layer 41, i.e., along the positive direction of the X-axis shown in the drawing, i.e., the direction away from the outer glass sheet 10 at the fourth surface 22. Each laminated structure 43 includes a high refractive index layer 431 and a low refractive index layer 432 laminated in order to form a high refractive index layer / low refractive index layer structure. The refractive index of the high refractive index layer 431 is 1.8 or more, and the refractive index of the low refractive index layer 432 is less than 1.7. In some embodiments, the refractive index of the high refractive index layer 431 is 2.0 or more. In some other embodiments, the refractive index of the high refractive index layer 431 is 2.2 or more. In this application, the term "lamination" includes direct contact and indirect contact.

[0042] During the heat treatment, the internal barrier layer 41 of the reflective coating 40 can prevent the destruction of the improvement layer 42 caused by the alkali metal ions on the fourth surface 22 of the inner glass sheet 20, and can prevent the oxidation of the improvement layer 42 caused by the diffusion of oxygen, which is advantageous for improving the thermal stability of the reflective coating 40. The material of the internal barrier layer 41 includes at least one of oxides of Zn, Sn, Ti, Si, Al, Nb, Zr, Ni, Mg, Cr, and Ta elements and oxides of alloys thereof, or at least one of nitrides of Si, Al, Zr, B, and Ti elements and nitrides of alloys thereof. Examples of the internal barrier layer 41 include a SiO2 layer (silicon oxide layer), ZnSnO x layer (zinc tin oxide layer), Si3N4 layer (silicon nitride layer), ZrSiN x layer (silicon and zirconium nitride). In one embodiment, the inner barrier layer 41 has a thickness of 3 nm or more, and in another embodiment, the inner barrier layer 41 has a thickness of 5 nm or more.

[0043] The improvement layer 42 has a certain degree of reflection effect for P-polarized light, and can further improve the P-polarized light reflectance of the reflective coating 40 while keeping the visible light reflectance of the reflective coating 40 low, thereby meeting the requirements of the head-up display glass 100 for a relatively high P-polarized light reflectance and a relatively low visible light reflectance. In one embodiment, the material of the improvement layer 42 includes at least one of Ni, Cr, Fe, Ti, Mo, Cu, Al, Au, Sn, Zr, In, Si, Nb, Ge, W, Ta, Pd, and Pt elements and their alloys. Examples of the improvement layer 42 include an amorphous Si layer, a crystalline Si layer, a Ti layer, an Al layer, and a NiCr layer.

[0044] In one embodiment, the element or alloy in the improved layer 42 has a crystalline structure, and the thickness of the improved layer is 1 nm to 40 nm. The thickness of the improved layer 42 is preferably greater than 5 nm, and more preferably, the thickness of the improved layer 42 is 10 nm to 30 nm. Examples of the improved layer 42 having a crystalline structure include Ti, Mo, Al, and Si.

[0045] In another embodiment, the element or alloy in the improved layer 42 has an amorphous structure, and the thickness of the improved layer 42 is between 1 nm and 5 nm.

[0046] Compared with the improvement layer 42 having an amorphous structure, the improvement layer 42 having a crystalline structure has better optical properties and lower visible light reflectance, so that the P-polarized light reflectance of the reflective coating 40 can be further improved, and a lower visible light reflectance and better visible light transmittance can be obtained.

[0047] The material of the high refractive index layer 431 in the laminate structure 43 includes at least one of oxides of Zn, Sn, Ti, Nb, Zr, Ni, In, Al, Ce, W, Mo, Sb, and Bi elements and oxides of alloys thereof, or at least one of nitrides of Si, Al, Zr, Y, Ce, and La elements, nitrogen oxides and nitrides of alloys thereof, and nitrogen oxides. xIn one embodiment, the high refractive index layer 431 has a thickness of 30 nm to 85 nm. In another embodiment, the high refractive index layer 431 has a thickness of 40 nm to 65 nm.

[0048] As can be understood, the high refractive index layer 431 can include one or more sub-layer structures, i.e., if the high refractive index layer 431 includes one sub-layer structure, the refractive index of this single sub-layer structure is 1.8 or more, and if the high refractive index layer 431 includes multiple sub-layer structures, the refractive index of each of the multiple sub-layer structures is 1.8 or more.

[0049] The material of the low refractive index layer 432 in the laminate structure 43 includes at least one of oxides of Si, Al, Zr, and B elements and oxides of alloys thereof. x In one embodiment, the low refractive index layer 432 has a thickness of 35 nm to 130 nm. In another embodiment, the low refractive index layer 432 has a thickness of 50 nm to 100 nm.

[0050] As can be appreciated, the low refractive index layer 432 can include one or more sub-layer structures, i.e., if the low refractive index layer 432 includes one sub-layer structure, the refractive index of this single sub-layer structure is less than 1.7, and if the low refractive index layer 432 includes multiple sub-layer structures, the refractive index of each of the multiple sub-layer structures is less than 1.7.

[0051] In some examples, as shown in FIG. 4 and FIG. 5, the improvement layer 42 is provided between the internal barrier layer 41 and the laminate structure 43. When the reflective coating 40 has one laminate structure 43, as shown in FIG. 4, the improvement layer 42 is located between the internal barrier layer 41 and the high refractive index layer 431 of the laminate structure 43. When the reflective coating 40 has a plurality of laminate structures 43, the improvement layer 42 is located between the internal barrier layer 41 and the first laminate structure 43 facing from the internal barrier layer 41 in the positive direction of the X-axis. When the reflective coating 40 has two laminate structures 43, as shown in FIG. 5, the improvement layer 42 is located between the internal barrier layer 41 and the first laminate structure 43 facing from the internal barrier layer 41 in the positive direction of the X-axis. Specifically, the improvement layer 42 is located between the internal barrier layer 41 and the high refractive index layer 431 of the first laminate structure 43.

[0052] In some other examples, as shown in Figs. 6 to 9, the improvement layer 42 is provided in at least one laminate structure 43. Specifically, the improvement layer 42 is provided between the high refractive index layer 431 and the low refractive index layer 432 of the laminate structure 43. When the reflective coating 40 includes one laminate structure 43, the improvement layer 42 is located between the high refractive index layer 431 and the low refractive index layer 432 of the laminate structure 43, as shown in Fig. 6. When the reflective coating 40 includes a plurality of laminate structures 43, in one case, the improvement layer 42 may be located between two adjacent laminate structures 43. As shown in Fig. 7, when the reflective coating 40 includes two laminate structures 43, the improvement layer 42 is located between the low refractive index layer 432 of the first laminate structure 43 and the high refractive index layer 431 of the second laminate structure 43, which are located in the positive direction of the X-axis from the inner barrier layer 41. In another case, the improvement layer 42 may be located between the high refractive index layer 431 and the low refractive index layer 432 of any one of the laminate structures 43 .

[0053] As shown in FIG. 8, the reflective coating 40 includes two laminate structures 43, and the improvement layer 42 is located between the high refractive index layer 431 and the low refractive index layer 432 of the first laminate structure 43 facing in the positive direction of the X-axis from the inner barrier layer 41.

[0054] As shown in FIG. 9, the reflective coating 40 includes two laminate structures 43, and the improvement layer 42 is located between a high refractive index layer 431 and a low refractive index layer 432 of the second laminate structure 43 facing in the positive direction of the X-axis from the inner barrier layer 41.

[0055] In the reflective coating 40 of the head-up display glass 100 according to the embodiment of the present application, the internal barrier layer 41 prevents the destruction of the improvement layer 42 in the reflective coating 40 caused by the alkali metal ions of the inner glass plate 20, and also prevents the oxidation of the improvement layer 42 caused by the diffusion of oxygen. The combined use of the improvement layer 42 and the laminated structure 43 further improves the P-polarized light reflectance of the reflective coating 40, preventing the occurrence of visual ghosting when P-polarized light is projected onto the head-up display glass 100, while maintaining a relatively high visible light transmittance and a relatively low visible light reflectance of the reflective coating 40, so that the head-up display glass 100 meets the requirements for safe driving, and no obvious shadow reflection is observed from inside the vehicle.

[0056] 10 and 11, Fig. 10 is a schematic diagram of a first example of the reflective coating 40 in the second embodiment of the head-up display glass 100 shown in Fig. 3. Fig. 11 is a schematic diagram of a second example of the reflective coating 40 in the second embodiment of the head-up display glass 100 shown in Fig. 3.

[0057] The reflective coating 40 in the second embodiment differs from the reflective coating 40 in the first embodiment in that the reflective coating 40 in the second embodiment further includes an outer barrier layer 44. That is, in the second embodiment, the reflective coating 40 includes an inner barrier layer 41, an improvement layer 42, at least one laminated structure 43, and an outer barrier layer 44. The inner barrier layer 41, the laminated structure 43, and the outer barrier layer 44 are laminated in order along the positive direction of the X-axis, that is, the direction away from the outer glass sheet 10 at the fourth surface 22.

[0058] In this embodiment, the external barrier layer 44 is provided on the side away from the internal barrier layer 41 of the outermost stacked structure in the positive direction of the X-axis from the internal barrier layer 41, that is, the external barrier layer 44 is provided on the surface away from the internal barrier layer 41 of the low refractive index layer 432 of the outermost stacked structure 43. As shown in FIG. 10, the reflective coating 40 of this embodiment includes one stacked structure 43. The external barrier layer 44 is provided on the surface away from the internal barrier layer 41 of the low refractive index layer 432 of the stacked structure 43. As shown in FIG. 11, the reflective coating 40 of this embodiment includes two stacked structures 43. The external barrier layer 44 is provided on one side of the outermost stacked structure 43 in the positive direction of the X-axis from the internal barrier layer 41. Specifically, the external barrier layer 44 is provided on the surface away from the internal barrier layer 41 of the low refractive index layer 432 of the second stacked structure 43 in the positive direction of the X-axis from the internal barrier layer 41.

[0059] During the heat treatment, the external barrier layer 44 of the reflective coating 40 is advantageous for improving the thermal stability of the reflective coating 40, preventing the oxidation of the improvement layer 42 in the reflective coating 40, and improving the mechanical stability and chemical stability of the reflective coating 40. In one embodiment, the material of the external barrier layer 44 includes at least one of nitrides of Si, Al, Zr, Ti, B, and Ni elements and nitrogen oxides of their alloys. The external barrier layer 44 may, for example, be a Si3N4 layer (silicon nitride layer). The external barrier layer 44 is preferably a silicon nitride layer doped with Al or Zr. In one embodiment, the thickness of the external barrier layer 44 is 3 nm to 30 nm, and since the thickness of the external barrier layer 44 is greater than 30 nm, it is possible to avoid affecting the P-polarized light reflectance or affecting the color of the reflective appearance.

[0060] In the reflective coating 40 of the glass 100 for a head-up display in this embodiment, the external barrier layer 44 blocks the intrusion of oxygen in the environment into the reflective coating 40, thereby preventing oxidation of the improvement layer 42 in the reflective coating 40, improving the mechanical and chemical stability of the reflective coating 40, and maintaining a relatively high P-polarized light reflectance and a relatively low visible light reflectance of the reflective coating 40, so that the glass 100 for a head-up display can meet the requirements of automotive glass.

[0061] Examples 1-7 and Comparative Examples 1-4

[0062] <Example 1>

[0063] Example 1 provides a head-up display glass 100 including an outer glass plate 10, a polymer interlayer 30, an inner glass plate 20, and a reflective coating 40, which are sequentially laminated. The reflective coating 40 of this example adopts the configuration of the first example of the reflective coating 40 of the above-mentioned second example. Specifically, the head-up display glass 100 can be formed by sequentially depositing the structure of the reflective coating 40 on the inner glass plate 20, then forming it according to the high-temperature (550 to 650°C) forming process of automotive glass, then sandwiching the polymer interlayer 30 between the inner glass plate 20 and the outer glass plate 10, and finally performing high-pressure compression bonding.

[0064] The reflective coating 40 includes an inner barrier layer 41, an improvement layer 42, a high refractive index layer 431, a low refractive index layer 432, and an outer barrier layer 44, which are sequentially laminated on the fourth surface 22 of the inner glass sheet 20 along a direction away from the outer glass sheet 10, i.e., along a direction from the inner glass sheet 20 toward the interior of the vehicle. In this embodiment, the high refractive index layer 431 and the low refractive index layer 432 jointly form a laminated structure 43, and the improvement layer 42 is provided between the inner barrier layer 41 and the laminated structure 43.

[0065] The outer glass plate 10 and the inner glass plate 20 are both normal transparent glass (clear glass with a visible light transmittance of ≧70%), and both have a thickness of 2.1 mm. The polymer intermediate layer 30 is polyvinyl butyral (PVB) and has a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer and has a thickness of 10 nm. The improvement layer 42 is a NiCr layer and has a thickness of 1.5 nm. The high refractive index layer 431 in the laminate structure 43 is TiO x The low refractive index layer 432 in the laminate structure 43 is a SiO2 layer and has a thickness of 72 nm. The outer barrier layer 44 is a Si3N4 layer and has a thickness of 10 nm.

[0066] <Example 2>

[0067] Example 2 provides a head-up display glass 100 including an outer glass sheet 10, a polymer interlayer 30, an inner glass sheet 20, and a reflective coating 40, which are laminated in sequence. Both the outer glass sheet 10 and the inner glass sheet 20 are normal transparent glass (clear glass with a visible light transmittance of ≧70%), and both have a thickness of 2.1 mm. The polymer interlayer 30 is polyvinyl butyral (PVB) and has a thickness of 0.76 mm.

[0068] The reflective coating 40 includes an inner barrier layer 41, a high refractive index layer 431, an improvement layer 42, a low refractive index layer 432, and an outer barrier layer 44, which are laminated in this order on the fourth surface 22 of the inner glass sheet 20 along a direction away from the outer glass sheet 10, i.e., along a direction from the inner glass sheet 20 toward the vehicle interior. In this embodiment, the high refractive index layer 431 and the low refractive index layer 432 jointly form a laminated structure 43, and the improvement layer 42 is provided in the laminated structure 43.

[0069] The inner barrier layer 41 is a Si3N4 layer and has a thickness of 33 nm. The high refractive index layer 431 is a TiO xThe outer barrier layer 44 is a Si3N4 layer and has a thickness of 6.5 nm. The improvement layer 42 is a NiCr layer and has a thickness of 1.9 nm. The low index layer 432 is a SiO2 layer and has a thickness of 86 nm. The outer barrier layer 44 is a Si3N4 layer and has a thickness of 6.5 nm.

[0070] <Example 3>

[0071] Example 3 provides a glass 100 for a head-up display. The difference from Example 2 is that the reflective coating 40 in the glass 100 for a head-up display of Example 3 does not include an outer barrier layer 44. The reflective coating 40 of this example employs the configuration of the third example of the reflective coating 40 in the above-mentioned first example.

[0072] The reflective coating 40 includes an inner barrier layer 41, a high refractive index layer 431, an improvement layer 42, and a low refractive index layer 432, which are laminated in this order on the fourth surface 22 of the inner glass sheet 20 along a direction away from the outer glass sheet 10, i.e., along a direction from the inner glass sheet 20 toward the interior of the vehicle. In this embodiment, the high refractive index layer 431 and the low refractive index layer 432 jointly form a laminated structure 43, and the improvement layer 42 is provided in the laminated structure 43.

[0073] <Example 4>

[0074] Example 4 provides a glass 100 for a head-up display, which includes an outer glass sheet 10, a polymer interlayer 30, an inner glass sheet 20, and a reflective coating 40, which are laminated in this order on the fourth surface 22 of the inner glass sheet 20 along a direction away from the outer glass sheet 10, i.e., along a direction from the inner glass sheet 20 toward the interior of the vehicle, the reflective coating 40 includes an inner barrier layer 41, a high refractive index layer 431, an improvement layer 42, a low refractive index layer 432, and an outer barrier layer 44, which are laminated in this order.

[0075] The outer glass plate 10 and the inner glass plate 20 are both ordinary transparent glass (clear glass with a visible light transmittance of ≥ 70%) and both have a thickness of 2.1 mm. The polymer interlayer 30 is polyvinyl butyral (PVB) and has a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer and has a thickness of 28 nm. The high refractive index layer 431 is TiO x The outer barrier layer 44 is a Si3N4 layer and has a thickness of 10 nm. The improvement layer 42 is a Ti layer and has a thickness of 3.5 nm. The low refractive index layer 432 is a SiO2 layer and has a thickness of 75 nm. The outer barrier layer 44 is a Si3N4 layer and has a thickness of 10 nm.

[0076] <Example 5>

[0077] Example 5 provides a glass 100 for a head-up display, which includes an outer glass sheet 10, a polymer interlayer 30, an inner glass sheet 20, and a reflective coating 40, which are laminated in this order. The reflective coating 40 includes an inner barrier layer 41, a high refractive index layer 431, an improvement layer 42, a low refractive index layer 432, and an outer barrier layer 44, which are laminated in this order on the fourth surface 22 of the inner glass sheet 20 along a direction away from the outer glass sheet 10, i.e., along a direction from the inner glass sheet 20 toward the inside of the vehicle.

[0078] The outer glass plate 10 and the inner glass plate 20 are both normal transparent glass (clear glass with a visible light transmittance of ≥ 70%) and both have a thickness of 2.1 mm. The polymer interlayer 30 is polyvinyl butyral (PVB) and has a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer and has a thickness of 42 nm. The high refractive index layer 431 is TiO x The outer barrier layer 44 is a Si3N4 layer and has a thickness of 12 nm. The improvement layer 42 is an Al layer and has a thickness of 2 nm. The low refractive index layer 432 is a SiO2 layer and has a thickness of 62 nm. The outer barrier layer 44 is a Si3N4 layer and has a thickness of 12 nm.

[0079] <Example 6>

[0080] Working Example 6provides a glass 100 for a head-up display, which includes an outer glass sheet 10, a polymer intermediate layer 30, an inner glass sheet 20, and a reflective coating 40, which are laminated in this order. The reflective coating 40 includes an inner barrier layer 41, an improvement layer 42, a high refractive index layer 431, a low refractive index layer 432, and an outer barrier layer 44, which are laminated in this order on the fourth surface 22 of the inner glass sheet 20 along a direction away from the outer glass sheet 10, i.e., along a direction from the inner glass sheet 20 toward the interior of the vehicle. The reflective coating 40 of this embodiment adopts the configuration of the first example of the reflective coating 40 in the above-mentioned second embodiment.

[0081] The outer glass plate 10 and the inner glass plate 20 are both normal transparent glass (clear glass with a visible light transmittance of ≧70%) and both have a thickness of 2.1 mm. The polymer interlayer 30 is polyvinyl butyral (PVB) and has a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer and has a thickness of 52 nm. The improvement layer 42 is an amorphous Si layer and has a thickness of 3.2 nm. The high refractive index layer 431 is a TiO x The low refractive index layer 432 is a SiO2 layer and has a thickness of 98 nm. The outer barrier layer 44 is a Si3N4 layer and has a thickness of 5 nm.

[0082] <Example 7>

[0083] Working Example 7 provides a glass 100 for a head-up display, which includes an outer glass sheet 10, a polymer intermediate layer 30, an inner glass sheet 20, and a reflective coating 40, which are laminated in this order. The reflective coating 40 includes an inner barrier layer 41, an improvement layer 42, a high refractive index layer 431, a low refractive index layer 432, and an outer barrier layer 44, which are laminated in this order on the fourth surface 22 of the inner glass sheet 20 along a direction away from the outer glass sheet 10, i.e., along a direction from the inner glass sheet 20 toward the interior of the vehicle. The reflective coating 40 of this embodiment adopts the configuration of the first example of the reflective coating 40 in the second embodiment described above.

[0084] The outer glass plate 10 and the inner glass plate 20 are both normal transparent glass (clear glass with a visible light transmittance of ≥ 70%) and both have a thickness of 2.1 mm. The polymer interlayer 30 is polyvinyl butyral (PVB) and has a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer and has a thickness of 50 nm. The improvement layer 42 is a crystalline Si layer and has a thickness of 26 nm. The high refractive index layer 431 is TiO x The low refractive index layer 432 is a SiO2 layer and has a thickness of 49 nm. The outer barrier layer 44 is a Si3N4 layer and has a thickness of 12 nm.

[0085] <Comparative Example 1>

[0086] Comparative Example 1 provides a head-up display glass including an outer glass sheet, a polymer interlayer, an inner glass sheet, and a reflective coating, the reflective coating including a high refractive index layer and a low refractive index layer, the high refractive index layer being laminated to the inner glass sheet, and the reflective coating not including an inner barrier layer, an improvement layer, and an outer barrier layer.

[0087] The outer and inner glass plates are both ordinary transparent glass (clear glass with a visible light transmittance of ≥ 70%) and both have a thickness of 2.1 mm. The polymer interlayer is polyvinyl butyral (PVB) and has a thickness of 0.76 mm. The high refractive index layer is TiO x The low refractive index layer is a SiO2 layer and has a thickness of 103 nm.

[0088] <Comparative Example 2>

[0089] Comparative Example 2 provides a head-up display glass including an outer glass sheet, a polymer interlayer, an inner glass sheet, and a reflective coating, the reflective coating including a high refractive index layer and a low refractive index layer, the high refractive index layer being laminated to the inner glass sheet, and the reflective coating not including an inner barrier layer, an improvement layer, and an outer barrier layer.

[0090] The outer and inner glass plates are both ordinary transparent glass (clear glass with a visible light transmittance of ≥ 70%) and both have a thickness of 2.1 mm. The polymer interlayer is polyvinyl butyral (PVB) and has a thickness of 0.76 mm. The high refractive index layer is TiO x The low refractive index layer is a SiO2 layer and has a thickness of 98 nm.

[0091] <Comparative Example 3>

[0092] A head-up display glass is provided in Comparative Example 3. The difference from the head-up display glass 100 in Example 1 is that the head-up display glass in Comparative Example 3 is not provided with the inner barrier 41.

[0093] <Comparative Example 4>

[0094] Comparative Example 4 provides a glass for a head-up display, which includes an outer glass sheet, a polymer interlayer, an inner glass sheet, and a reflective coating, which are laminated in this order. The reflective coating includes an inner barrier layer, a high refractive index layer, a low refractive index layer, an improvement layer, and an outer barrier layer, which are laminated in this order on the surface of the inner glass sheet along a direction away from the outer glass sheet, i.e., along a direction from the inner glass sheet toward the inside of the vehicle. The high refractive index layer and the low refractive index layer of Comparative Example 4 jointly form a laminated structure, and the improvement layer is provided between the laminated structure and the outer barrier layer.

[0095] The outer and inner glass sheets are both ordinary transparent glass (clear glass with a visible light transmittance of ≥ 70%) and both have a thickness of 2.1 mm. The polymer interlayer is polyvinyl butyral (PVB) and has a thickness of 0.76 mm.

[0096] The inner barrier layer is a Si3N4 layer with a thickness of 7 nm. The high refractive index layer is a TiO xThe low refractive index layer is a SiO2 layer and has a thickness of 92 nm. The improvement layer is a NiCr layer and has a thickness of 1.5 nm. The outer barrier layer is a Si3N4 layer and has a thickness of 6 nm.

[0097] The optical indexes of the head-up display glass of Examples 1 to 7 and Comparative Examples 1 to 4 are measured. The visible light transmittance of the head-up display glass is measured, and the P-polarized light reflectance and visible light reflection color of the head-up display glass are measured from the reflective coating side. The results of Examples 1 to 3 and Comparative Examples 1 to 4 are shown in Table 1, and the results of Examples 4 to 7 are shown in Table 2.

[0098] [Table 1]

[0099] Glass for head-up displays is usually required to simultaneously satisfy the following: visible light reflectance is less than 15%, reflectance for P-polarized light incident at an incident angle of 60° is 15% or more, and reflectance for P-polarized light incident at an incident angle of 65° is 20% or more. Comparing Comparative Example 1 and Comparative Example 2 with reference to Table 1, the reflective coatings of Comparative Example 1 and Comparative Example 2 have a laminated structure of a high refractive index layer and a low refractive index layer (TiO x / SiO2) is used, and the requirements for the P-polarized light reflectance and the visible light reflectance of the head-up display glass cannot be met simultaneously by simply adjusting the thicknesses of the high refractive index layer and the low refractive index layer. For example, the head-up display glass of Comparative Example 1 meets the requirement of a reflectance of less than 15% for visible light, but does not meet the requirement of a reflectance of P-polarized light incident at an incidence angle of 60° and an incidence angle of 65°. The head-up display glass of Comparative Example 2 meets the requirement of a reflectance of P-polarized light incident at an incidence angle of 60° and an incidence angle of 65°, but does not meet the requirement of a reflectance of less than 15% for visible light. This shows that the P-polarized light reflectance can be increased to a certain extent by simply adjusting the thicknesses of the high refractive index layer and the low refractive index layer, but the visible light reflectance also improves accordingly with the improvement of the P-polarized light reflectance, and further reaches 15% or more, which does not meet the requirements. Therefore, it was found that the requirements for a relatively high reflectance for P-polarized light and a relatively low reflectance for visible light of the head-up display glass cannot be met simultaneously by simply providing a laminated structure.

[0100] In contrast, according to the data of Examples 1 to 3, the examples of the present application provide an inner barrier layer and an improvement layer in the reflective coating, thereby increasing the reflectance of the glass for head-up displays for P-polarized light incident at an angle of 60° to 73° to 17% to 35%. or increase to 16.1% to 33.8%, or increase to 17.3% to 35.1%, or increase to 18.5% to 35.6%, and even further increase the reflectance of the head-up display glass to visible light while still maintaining the reflectance below 15%; The reflective color of the head-up display glass measured from the reflective coating has an a value of -4.2 to -1.8 and a b value of -7.2 to -5.2; In addition, the head-up display glass can have a neutral color. In addition, when comparing Example 3 with Example 2, it can be seen that, although the thermal stability of the entire reflective coating is somewhat decreased when the external barrier layer is not used, the head-up display glass formed can still simultaneously meet the requirements for reflectance for P-polarized light and reflectance for visible light.

[0101] Comparing Comparative Example 3 with Examples 1 and 2, the reflective coating of Comparative Example 3 does not have an internal barrier layer, and the improvement layer (NiCr / 1.5 nm) is in direct contact with the inner glass plate. During high-temperature heat treatment, the diffusion of metal ions and oxygen ions on the surface of the inner glass plate causes destruction and oxidation of the improvement layer, resulting in a decrease in the reflective ability of the head-up display glass for P-polarized light.

[0102] Comparing Comparative Example 4 with Examples 1 and 2, the reflective coating of Comparative Example 4 has an improved layer, but the improved layer has a laminated structure (TiO x The improvement layer is provided between the low refractive index layer (SiO2) and the outer barrier layer (Si3N4). and the outer barrier layer After P polarized light and visible light are incident on the reflective coating from inside the vehicle, the P polarized light and visible light are first absorbed and reflected by the improvement layer and then transmitted through the high refractive index layer / low refractive index layer, which deteriorates the performance of the entire reflective coating, and the visible light transmittance of the formed head-up display glass is less than 70%, and the P polarized light reflectance is less than 15% or less than 20%, neither of which meets the requirements.

[0103] [Table 2]

[0104] According to the data of Examples 4 to 7, the reflectance of the glass for head-up displays for P-polarized light incident at 60° to 73° is 15.2% to 32.4%, or 18.5% to 35.6%, or 19.5% to 37.5%, or 20.1% to 38.8%, and the reflected color of the glass for head-up displays measured from the reflective coating has an a value of -6.2 to -1.7 and a b value of -5.4 to -4.2.

[0105] As can be seen from Tables 1 and 2, the head-up display glasses according to Examples 1 to 7 of the present application have an increased reflectance of 17% to 35% for P-polarized light incident at an angle of 60° to 73°. or increased from 15.2% to 38.8%; It may even increase further, but the visible light reflectance remains below 15%. The reflective color of the head-up display glass measured from the reflective coating has an a value of -6.2 to -1.7 and a b value of -7.2 to -4.2;In addition, a neutral color can be obtained, which meets the requirements of automotive glass. Comparing Examples 6 and 7, it can be seen that when a material having a crystalline structure such as nanocrystalline silicon is used as the improvement layer, due to the reflection and transmission properties of crystalline silicon for P-polarized light, the reflective coating formed by using crystalline silicon as the improvement layer can improve the P-polarized light reflectance to a certain extent compared to amorphous silicon, while maintaining a relatively high visible light transmittance and a relatively low visible light reflectance.

[0106] The above contents are merely preferred embodiments of the present application and are not used to limit the scope of the claims of the present application. Those skilled in the art can understand and realize the whole or part of the operation of the above embodiments, and the equivalent changes made by those skilled in the art based on the claims of the present application still belong to the scope of coverage of the present application.

Claims

1. A glass for a head-up display, A laminated glass and a reflective coating capable of reflecting P-polarized light, the laminated glass includes an outer glass sheet, a polymer interlayer, and an inner glass sheet, the polymer interlayer being sandwiched between the outer glass sheet and the inner glass sheet; the reflective coating comprises a laminated internal barrier layer, an improvement layer and at least one laminate structure, the internal barrier layer being provided on a surface of the inner glass sheet away from the polymer interlayer, the laminate structure comprising a high refractive index layer and a low refractive index layer laminated in sequence along a direction away from the internal barrier layer, the refractive index of the high refractive index layer being 1.8 or more, and the refractive index of the low refractive index layer being less than 1.7; The improvement layer is provided between the internal barrier layer and the laminated structure, or the improvement layer is provided between the high refractive index layer and the low refractive index layer. A head-up display glass.

2. The reflectance of the glass for a head-up display with respect to P-polarized light incident at an incident angle θ is Y, θ satisfies 60°≦θ≦75°, and Y satisfies Y≧15%.

2. The glass for a head-up display according to claim 1.

3. When θ satisfies 65°≦θ≦75°, Y satisfies Y≧20%, and when θ satisfies 70°≦θ≦75°, Y satisfies Y≧27%.

3. The glass for a head-up display according to claim 2.

4. The reflectance of the glass for a head-up display for visible light incident vertically is 15% or less.

2. The glass for a head-up display according to claim 1.

5. The material of the inner barrier layer includes at least one of oxides of Zn, Sn, Ti, Si, Al, Nb, Zr, Ni, Mg, Cr, and Ta elements and oxides of alloys thereof, or at least one of nitrides of Si, Al, Zr, B, and Ti elements and nitrides of alloys thereof; The glass for a head-up display according to any one of claims 1 to 4.

6. The material of the improvement layer includes at least one of Ni, Cr, Fe, Ti, Mo, Cu, Al, Au, Sn, Zr, In, Si, Nb, Ge, W, Ta, Pd, and Pt elements and alloys thereof; The glass for a head-up display according to any one of claims 1 to 4.

7. The element or alloy in the improved layer has a crystal structure, and the improved layer has a thickness of 1 nm to 40 nm.

7. The glass for a head-up display according to claim 6.

8. The element or alloy in the improved layer has an amorphous structure, and the thickness of the improved layer is 1 nm to 5 nm.

7. The glass for a head-up display according to claim 6.

9. the reflective coating further comprises an outer barrier layer, the outer barrier layer being disposed on a surface of the at least one laminate structure remote from the inner barrier layer; The glass for a head-up display according to any one of claims 1 to 4.

10. The material of the outer barrier layer includes at least one of nitrides of Si, Al, Zr, Ti, B, and Ni elements and nitrogen oxides of alloys thereof; 10. The glass for a head-up display according to claim 9.

11. The thickness of the outer barrier layer is 3 nm to 30 nm.

10. The glass for a head-up display according to claim 9.

12. the difference between the refractive index of the inner glass sheet and the refractive index of the polymer interlayer is 0.1 or less, and the difference between the refractive index of the outer glass sheet and the refractive index of the polymer interlayer is 0.1 or less.

2. The glass for a head-up display according to claim 1.

13. Among the Lab values ​​of the reflected color of the glass for a head-up display measured from the reflective coating side, the a value ranges from −8 to 3, and the b value ranges from −12 to 0.

2. The glass for a head-up display according to claim 1.

14. A glass for a head-up display, A laminated glass and a reflective coating capable of reflecting P-polarized light, the laminated glass includes an outer glass sheet, a polymer interlayer, and an inner glass sheet, the polymer interlayer being sandwiched between the outer glass sheet and the inner glass sheet; The reflective coating includes a stacked improvement layer and at least one stacked structure, the stacked structure including a high refractive index layer and a low refractive index layer stacked in sequence along a direction away from the inner barrier layer, the high refractive index layer having a refractive index of 1.8 or more, and the low refractive index layer having a refractive index of less than 1.7; The reflectance of the glass for a head-up display with respect to P-polarized light incident at an incident angle θ is Y, θ satisfies 60°≦θ≦75°, and Y satisfies Y≧15%. A head-up display glass.

15. The reflective coating further comprises an internal barrier layer, the internal barrier layer being disposed on a surface of the inner glass sheet away from the polymer interlayer.

15. The glass for a head-up display according to claim 14.

16. The material of the improvement layer has a crystal structure, and the thickness of the improvement layer is 1 nm to 40 nm.

15. The glass for a head-up display according to claim 14.

17. The material of the improvement layer has an amorphous structure, and the thickness of the improvement layer is 1 nm to 5 nm.

15. The glass for a head-up display according to claim 14.

18. The material of the improvement layer includes at least one of Ni, Cr, Fe, Ti, Mo, Cu, Al, Au, Sn, Zr, In, Si, Nb, Ge, W, Ta, Pd, and Pt elements and alloys thereof; The glass for a head-up display according to claim 14 .

19. Among the Lab values ​​of the reflected color of the glass for a head-up display measured from the reflective coating side, the a value ranges from −8 to 3, and the b value ranges from −12 to 0.

15. The glass for a head-up display according to claim 14.

20. A head-up display system, A head-up display glass according to any one of claims 1 to 19, comprising a projection light source for generating P-polarized light, the P-polarized light being projected onto the reflective coating. A head-up display system.

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