Head-up display glass and head-up display system

Abstract

The present application discloses a head-up display glass and a head-up display system. The head-up display glass includes laminated glass and a reflective film layer; the laminated glass includes an outer glass plate, a polymer interlayer, and an inner glass plate; the reflective film layer includes an inner barrier layer, an improvement layer, and at least one laminated structure arranged in a stacked manner. The inner barrier layer can block the damage of alkali metal ions on the glass surface to the improvement layer during the heat treatment process and block the oxidation of the improvement layer caused by the diffusion of oxygen. The improvement layer can further improve the reflectivity of the reflective film layer to P-polarized light while maintaining a low reflectivity of the reflective film layer to visible light, so that when the driver inside the vehicle visually observes the reflective image of the head-up display glass, only the reflective image of the reflective film layer can be observed, thus eliminating the visual ghosting phenomenon; moreover, the reflectivity of the head-up display glass in the present application to visible light is less than or equal to 15%, and no obvious reflection phenomenon can be observed inside the vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of glass products, and particularly to a head-up display glass and a head-up display system. Background Art

[0002] With the development of science and technology, head-up display (HUD) systems are increasingly used in vehicles. The head-up display system in a vehicle can display important driving information, such as speed, engine revolutions, fuel consumption, tire pressure, navigation, and information of external intelligent devices, in real time in the driver's field of vision. This enables the driver to see the driving information without having to lower their head, thus avoiding distraction of the driver's attention from the road ahead; at the same time, it enables the driver not to have to adjust their eyes between observing the distant road and the nearby instrument panel, which can avoid eye fatigue and greatly enhance driving safety and improve the driving experience.

[0003] Currently, the realization of head-up display technology mainly adopts two methods: light-emitting imaging and projection imaging. Among them, projection imaging uses the head-up display glass itself or an additional optical element for projection display, and using the head-up display glass to reflect the projection image is the simplest structure. Generally, the head-up display glass is laminated glass. When the light emitted by the projection light source of the head-up display system passes through the two surfaces of the laminated glass in contact with the air, reflection will occur, and the reflection images on the two surfaces will shift to form two interfering double images, which greatly limits the clarity of the projection display image. Summary of the Invention

[0004] The purpose of the present application is to provide a head-up display glass and a head-up display system, and the head-up display glass can clearly form an image without double-image phenomenon.

[0005] The present application provides a head-up display glass, including laminated glass and a reflective film layer, and the reflective film layer can reflect P-polarized light;

[0006] The laminated glass includes an outer glass plate, a polymer intermediate layer, and an inner glass plate, and the polymer intermediate layer is sandwiched between the outer glass plate and the inner glass plate;

[0007] The reflective film layer includes an inner barrier layer, an improvement layer, and at least one stacked structure arranged in layers. The inner barrier layer is provided on the surface of the inner glass plate facing away from the polymer intermediate layer. The stacked structure includes a high refractive index layer and a low refractive index layer stacked in sequence in a direction away from the inner barrier layer. The refractive index of the high refractive index layer ≥ 1.8, and the refractive index of the low refractive index layer < 1.7;

[0008] The improvement layer is provided between the inner barrier layer and the stacked structure; or, the improvement layer is provided between the high refractive index layer and the low refractive index layer.

[0009] Among them, the reflectivity of the head-up display glass for P-polarized light incident at an incident angle θ is Y, 60° ≤ θ ≤ 75°, and Y ≥ 15%.

[0010] Among them, when 65° ≤ θ ≤ 75°, Y ≥ 20%; when 70° ≤ θ ≤ 75°, Y ≥ 27%.

[0011] Among them, the reflectivity of the head-up display glass for vertically incident visible light is ≤ 15%.

[0012] Among them, the material of the inner barrier layer is selected from at least one of the oxides of elements Zn, Sn, Ti, Si, Al, Nb, Zr, Ni, Mg, Cr, Ta and the oxides of their alloys, or is selected from at least one of the nitrides of elements Si, Al, Zr, B, Ti and the nitrides of their alloys.

[0013] Among them, the material of the improvement layer is selected from at least one of the simple substances of elements Ni, Cr, Fe, Ti, Mo, Cu, Al, Au, Sn, Zr, In, Si, Nb, Ge and their alloys.

[0014] Among them, the simple substance or alloy in the improvement layer has a crystal structure, and the thickness of the improvement layer is 1 nm to 40 nm.

[0015] Among them, the simple substance or alloy in the improvement layer has an amorphous structure, and the thickness of the improvement layer is 1 nm to 5 nm.

[0016] Among them, the reflective film layer further includes an outer barrier layer, and the outer barrier layer is provided on the surface of at least one stacked structure away from the inner barrier layer.

[0017] Among them, the material of the outer barrier layer is selected from at least one of the nitrides of elements Si, Al, Zr, Ti, B, Ni and the oxynitrides of their alloys.

[0018] Among them, the thickness of the outer barrier layer is 3 nm to 30 nm.

[0019] Among them, the difference between the refractive index of the inner glass plate and the refractive index of the polymer intermediate layer is not greater than 0.1, and the difference between the refractive index of the outer glass plate and the refractive index of the polymer intermediate layer is not greater than 0.1.

[0020] Among them, when measuring the a value in the Lab value of the reflection color of the head-up display glass from the side of the reflective film layer, the range of the a value is between -8 and 3, and the range of the b value is between -12 and 0.

[0021] This application also provides a head-up display system, including a projection light source and the head-up display glass as above. The projection light source is used to generate P-polarized light, and the P-polarized light is projected onto the reflective film layer.

[0022] The present application provides a head-up display glass and a head-up display system. By adding an inner barrier layer and an improvement layer in the reflective film layer, the inner barrier layer can block the damage of alkali metal ions on the glass surface to the improvement layer during the heat treatment process and block the oxidation of the improvement layer caused by the diffusion of oxygen. The improvement layer can further increase the reflectivity of the reflective film layer to P-polarized light while maintaining a low reflectivity of the reflective film layer to visible light. Under the combined action of the inner barrier layer, the improvement layer and the laminated structure, the formed reflective film layer has a high reflectivity to P-polarized light. Therefore, when the driver inside the vehicle visually observes the reflection imaging of the head-up display glass, only the reflection image of the reflective film layer can be observed, thus eliminating the visual ghosting phenomenon. Moreover, the reflectivity of the head-up display glass in the present application to visible light is less than or equal to 15%, and no obvious reflection phenomenon can be observed inside the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of a vehicle equipped with the head-up display system according to the embodiment of the present application;

[0025] Figure 2 is Figure 1 Structural schematic diagram of the head-up display system in the vehicle shown;

[0026] Figure 3 is Figure 2 Cross-sectional structural schematic diagram of the first embodiment of the head-up display glass in the head-up display system shown;

[0027] Figure 4 is Figure 3 Structural schematic diagram of the first example of the reflective film layer in the first embodiment of the head-up display glass shown;

[0028] Figure 5 is Figure 3 Structural schematic diagram of the second example of the reflective film layer in the first embodiment of the head-up display glass shown;

[0029] Figure 6 is Figure 3 Structural schematic diagram of the third example of the reflective film layer in the first embodiment of the head-up display glass shown;

[0030] Figure 7 is Figure 3Schematic diagram of the fourth example of the reflective film layer in the first embodiment of the head-up display glass shown;

[0031] Figure 8 is Figure 3 Schematic diagram of the fifth example of the reflective film layer in the first embodiment of the head-up display glass shown;

[0032] Figure 9 is Figure 3 Schematic diagram of the sixth example of the reflective film layer in the first embodiment of the head-up display glass shown;

[0033] Figure 10 is Figure 3 Schematic diagram of the first example of the reflective film layer in the second embodiment of the head-up display glass shown;

[0034] Figure 11 is Figure 3 Schematic diagram of the second example of the reflective film layer in the second embodiment of the head-up display glass shown. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0036] Please refer to Figure 1 , Figure 1 which shows a schematic diagram of a vehicle 1 equipped with a head-up display system 1000 according to an embodiment of the present application.

[0037] The vehicle 1 includes a head-up display system 1000 and a vehicle body 2000. The head-up display system 1000 is disposed on the vehicle body 2000 and is used to display important driving information, such as speed, engine speed, fuel consumption, tire pressure, navigation, and information of an external intelligent device, in real time in the driver's field of vision.

[0038] Please refer to Figure 2 , Figure 2 is Figure 1 a schematic diagram of the head-up display system 1000 in the vehicle 1 shown.

[0039] 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 installed on the vehicle body 2000, and the projection light source 200 is located inside the vehicle body 2000. The head-up display glass 100 has opposite first and second side surfaces 101 and 102. When the head-up display glass 100 is installed on the vehicle, the first side surface 101 faces the outside of the vehicle, and the second side surface 102 faces the inside of the vehicle.

[0040] The projection light source 200 is installed inside the vehicle. The projection light source 200 generates 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. Part of the P-polarized light is incident on the second side surface 102 at an incident angle θ and is reflected on the second side surface 102. Part of the P-polarized light passes through the head-up display glass 100 and reaches the first side surface 101, and is reflected on the first side surface 101. The second side surface 102 of the head-up display glass 100 facing the inside of the vehicle has a high reflectivity to P-polarized light, and the first side surface 101 facing the outside of the vehicle has a low reflectivity to P-polarized light. When the driver inside the vehicle visually observes the reflected image (HUD display image) of the head-up display glass 100, only the reflected image of the second side surface 102 can be observed, thereby eliminating the visual ghosting phenomenon.

[0041] Among them, the projection light source 200 generating P-polarized light can be understood as that the projection light rays generated by the projection light source 200 contain at least 80% of P-polarized light. The higher the proportion of P-polarized light in the projection light rays, the higher the brightness and clarity of the head-up display image, and the easier it is to eliminate the visual ghosting phenomenon. More preferably, it contains at least 90% of P-polarized light, and particularly 100% of P-polarized light, that is, the projection light rays are basically pure P-polarized light.

[0042] See Figure 3 , Figure 3 is Figure 2 a schematic cross-sectional structure diagram of the first embodiment of the head-up display glass 100 in the head-up display system 1000 shown. Among them, for the convenience of description, it is defined that Figure 2 the thickness direction of the head-up display glass 100 shown is the X-axis direction.

[0043] The head-up display glass 100 includes laminated glass and a reflective film layer 40. The reflective film layer 40 can reflect P-polarized light. Along the X-axis direction, the laminated glass sequentially includes an outer glass plate 10, a polymer intermediate layer 30, and an inner glass plate 20. The polymer intermediate layer 30 is sandwiched between the outer glass plate 10 and the inner glass plate 20.

[0044] The outer glass plate 10 has a first surface 11 and a second surface 12. The first surface 11 and the second surface 12 are oppositely arranged. The second surface 12 faces the polymer intermediate layer 30. The first surface 11 is the interface between the outer glass plate 10 and the air, that is, the first side surface 101 of the head-up display glass 100. The inner glass plate 20 has a third surface 21 and a fourth surface 22. The third surface 21 and the fourth surface 22 are oppositely arranged. The third surface 21 faces the polymer intermediate layer 30, and the fourth surface 22 faces away from the polymer intermediate layer 30. In one embodiment, the difference between the refractive index of the outer glass plate 10 and the refractive index of the polymer intermediate layer 30 is not greater than 0.1, and the difference between the refractive index of the inner glass plate 20 and the refractive index of the polymer intermediate layer 30 is not greater than 0.1.

[0045] The reflective film layer 40 is provided on the fourth surface 22 of the inner glass plate 20. When the head-up display glass 100 is installed on a vehicle, the reflective film layer 40 faces the interior of the vehicle. The surface of the reflective film layer 40 facing away from the fourth surface 22 is the second side surface 102. The reflective film layer 40 has a relatively high reflectivity to the P-polarized light emitted by the projection light source 200, and the first surface 11 of the outer glass plate 10 has a relatively low reflectivity to the P-polarized light, thereby eliminating the visual ghosting phenomenon.

[0046] In this embodiment, the reflectivity of the head-up display glass 100 to the P-polarized light incident at an incident angle θ is Y. In one embodiment, 60° ≤ θ ≤ 75°, and Y ≥ 20%. In another embodiment, 65° ≤ θ ≤ 75°, and Y ≥ 20%. In another embodiment, when 70° ≤ θ ≤ 75°, Y ≥ 27%.

[0047] Please refer to Figures 4 to 9 , Figure 4 is Figure 3 the schematic structural diagram of the first example of the reflective film layer 40 in the first embodiment of the head-up display glass 100 shown in Figure 5 is Figure 3 the schematic structural diagram of the second example of the reflective film layer 40 in the first embodiment of the head-up display glass 100 shown in Figure 6 is Figure 3 the schematic structural diagram of the third example of the reflective film layer 40 in the first embodiment of the head-up display glass 100 shown in Figure 7 is Figure 3 the schematic structural diagram of the fourth example of the reflective film layer 40 in the first embodiment of the head-up display glass 100 shown in Figure 8 is Figure 3 the schematic structural diagram of the fifth example of the reflective film layer 40 in the first embodiment of the head-up display glass 100 shown in Figure 9 is Figure 3 the schematic structural diagram of the sixth example of the reflective film layer 40 in the first embodiment of the head-up display glass 100 shown in. Wherein, the positive direction of the X-axis in the figure is the direction away from the inner barrier layer 41.

[0048] In the first embodiment, the reflective film layer 40 includes an inner barrier layer 41, an improvement layer 42, and at least one stacked structure 43 that are stacked. The inner barrier layer 41 is disposed on the fourth surface 22 of the inner glass plate 20. In the direction away from the inner barrier layer 41, that is, in the positive direction of the X axis shown in the figure, that is, from the fourth surface 22 towards the direction away from the outer glass plate 10, the inner barrier layer 41 and the stacked structure 43 are stacked in sequence. Each stacked structure 43 includes a high refractive index layer 431 and a low refractive index layer 432 that are stacked in sequence to form a high refractive index layer / low refractive index layer structure. Among them, the refractive index of the high refractive index layer 431 is ≥1.8, and the refractive index of the low refractive index layer 432 is <1.7. In some embodiments, the refractive index of the high refractive index layer 431 is ≥2.0, and in other embodiments, the refractive index of the high refractive index layer 431 is ≥2.2. In this application, "stacked" includes direct contact and indirect contact.

[0049] Among them, when the reflective film layer 40 is heat-treated, the inner barrier layer 41 can block the damage of the alkali metal ions on the fourth surface 22 of the inner glass plate 20 to the improvement layer 42, and block the oxidation of the improvement layer 42 due to the diffusion of oxygen, which is beneficial to improving the thermal stability of the reflective film layer 40. The material of the inner barrier layer 41 is selected from at least one of oxides of elements such as Zn, Sn, Ti, Si, Al, Nb, Zr, Ni, Mg, Cr, Ta and their alloy oxides, or selected from at least one of nitrides of elements such as Si, Al, Zr, B, Ti and their alloy nitrides. Examples of the inner barrier layer 41 include a SiO2 layer (silicon oxide layer), a ZnSnOx layer (zinc tin oxide layer), a Si3N4 layer (silicon nitride layer), and a ZrSiNx layer (zirconium silicon nitride layer). In one embodiment, the thickness of the inner barrier layer 41 is ≥3 nm, and in another embodiment, the thickness of the inner barrier layer 41 is ≥5 nm.

[0050] Among them, the improvement layer 42 has a certain reflection effect on P-polarized light, can further improve the reflectivity of the reflective film layer 40 to P-polarized light, and at the same time keep the reflective film layer 40 having a low reflectivity to visible light, so as to meet the requirements of the head-up display glass 100 having a high reflectivity to P-polarized light and a low reflectivity to visible light. In one embodiment, the material of the improvement layer 42 is selected from at least one of elements such as Ni, Cr, Fe, Ti, Mo, Cu, Al, Au, Sn, Zr, In, Si, Nb, Ge and their alloys. Examples of the improvement layer 42 include an amorphous Si layer, a crystalline Si layer, a Ti layer, an Al layer, a NiCr layer, etc.

[0051] In one embodiment, the element or alloy in the improvement layer 42 has a crystal structure, and the thickness of the improvement layer is 1 nm to 40 nm. Preferably, the thickness of the improvement layer 42 is greater than 5 nm, and more preferably, the thickness of the improvement layer 42 is 10 nm to 30 nm. Examples of the improvement layer 42 having a crystal structure include Ti, Mo, Al, and Si.

[0052] In another embodiment, the element or alloy in the improvement layer 42 has an amorphous structure, and the thickness of the improvement layer 42 is 1 nm to 5 nm.

[0053] Compared with the improvement layer 42 having an amorphous structure, the improvement layer 42 having a crystal structure has higher optical properties and lower visible light reflectivity, and can further improve the reflectivity of the reflective film layer 40 to P-polarized light, obtain lower visible light reflectivity, and better visible light transmittance.

[0054] Among them, the material of the high refractive index layer 431 in the stacked structure 43 is selected from at least one of oxides of elements such as Zn, Sn, Ti, Nb, Zr, Ni, In, Al, Ce, W, Mo, Sb, and Bi and their alloy oxides, or selected from nitrides, oxynitrides of elements such as Si, Al, Zr, Y, Ce, and La and their alloy nitrides, oxynitrides. Examples of the high refractive index layer 431 include TiO x etc. In one embodiment, the thickness of the high refractive index layer 431 is 30 nm to 85 nm; in another embodiment, the thickness of the high refractive index layer 431 is 40 nm to 65 nm.

[0055] It can be understood that the high refractive index layer 431 may contain one or more sub-layer structures. That is, when the high refractive index layer 431 contains one sub-layer structure, the refractive index of the single sub-layer structure is ≥1.8, and when the high refractive index layer 431 contains multiple sub-layer structures, the refractive indices of the multiple sub-layer structures are all ≥1.8.

[0056] Among them, the material of the low refractive index layer 432 in the stacked structure 43 is selected from at least one of oxides of elements such as Si, Al, Zr, and B and their alloy oxides. Examples of the low refractive index layer 432 include SiO x etc. In one embodiment, the thickness of the low refractive index layer 432 is 35 nm to 130 nm; in another embodiment, the thickness of the low refractive index layer 432 is 50 nm to 100 nm.

[0057] It can be understood that the low refractive index layer 432 may contain one or more sub-layer structures. That is, when the low refractive index layer 432 contains one sub-layer structure, the refractive index of the single sub-layer structure is <1.7, and when the low refractive index layer 432 contains multiple sub-layer structures, the refractive indices of the multiple sub-layer structures are all <1.7.

[0058] In some examples, such as Figure 4 and Figure 5 shown, the improvement layer 42 is disposed between the inner barrier layer 41 and the stacked structure 43. When the reflective film layer 40 has a stacked structure 43, such as Figure 4 shown, the improvement layer 42 is located between the inner barrier layer 41 and the high refractive index layer 431 in the stacked structure 43. When the reflective film layer 40 has multiple stacked structures 43, the improvement layer 42 is located between the inner barrier layer 41 and the first stacked structure 43 arranged in the positive X-axis direction from the inner barrier layer 41. As Figure 5 shown, the reflective film layer 40 has two stacked structures 43, and the improvement layer 42 is located between the inner barrier layer 41 and the first stacked structure 43 in the positive X-axis direction from the inner barrier layer 41. Specifically, the improvement layer 42 is located between the inner barrier layer 41 and the high refractive index layer 431 of the first stacked structure 43.

[0059] In some other examples, such as Figures 6 to 9 shown, the improvement layer 42 is disposed in at least one stacked structure 43. Specifically, the improvement layer 42 is disposed between the high refractive index layer 431 and the low refractive index layer 432 of the stacked structure 43. When the reflective film layer 40 has a stacked structure 43, such as Figure 6 shown, the improvement layer 42 is located between the high refractive index layer 431 and the low refractive index layer 432 of the stacked structure 43. When the reflective film layer 40 has multiple stacked structures 43, in one case, the improvement layer 42 can be located between two adjacent stacked structures 43. As Figure 7 shown, the reflective film layer 40 has two stacked structures 43, and the improvement layer 42 is located between the low refractive index layer 432 of the first stacked structure 43 in the positive X-axis direction from the inner barrier layer 41 and the high refractive index layer 431 of the second stacked structure 43; in another case, the improvement layer 42 can be located between the high refractive index layer 431 and the low refractive index layer 432 of any stacked structure 43,

[0060] such as Figure 8 shown, the reflective film layer 40 has two stacked 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 stacked structure 43 in the positive X-axis direction from the inner barrier layer 41,

[0061] such as Figure 9 shown, the reflective film layer 40 has two stacked 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 second stacked structure 43 in the positive X-axis direction from the inner barrier layer 41.

[0062] In the reflective film layer 40 of the head-up display glass 100 provided by the embodiments of the present application, the inner barrier layer 41 is used to block the damage of the alkali metal ions in the inner glass plate 20 to the improvement layer 42 in the reflective film layer 40 and to block the oxidation of the improvement layer 42 caused by the diffusion of oxygen. The improvement layer 42 and the laminated structure 43 are used in combination to further improve the reflectivity of the reflective film layer 40 to P-polarized light, so that no visual ghosting phenomenon occurs when the P-polarized light is projected onto the head-up display glass 100. At the same time, the reflective film layer 40 can also maintain a high visible light transmittance and a low visible light reflectivity, so that the head-up display glass 100 meets the requirements of safe driving and no obvious reflection phenomenon can be observed from inside the vehicle.

[0063] See Figure 10 and Figure 11 , Figure 10 is Figure 3 a schematic structural diagram of the first example of the reflective film layer 40 in the second embodiment of the head-up display glass 100 shown. Figure 11 is Figure 3 a schematic structural diagram of the second example of the reflective film layer 40 in the second embodiment of the head-up display glass 100 shown.

[0064] The difference between the reflective film layer 40 in the second embodiment and the reflective film layer 40 in the first embodiment is that the reflective film layer 40 in the second embodiment further includes an outer barrier layer 44. That is, in the second embodiment, the reflective film layer 40 includes an inner barrier layer 41, an improvement layer 42, at least one laminated structure 43, and an outer barrier layer 44. Along the positive X-axis direction, that is, from the fourth surface 22 away from the outer glass plate 10, the inner barrier layer 41, the laminated structure 43, and the outer barrier layer 44 are laminated in sequence.

[0065] In this embodiment, the outer barrier layer 44 is disposed on the side of the outermost laminated structure away from the inner barrier layer 41 in the positive X-axis direction from the inner barrier layer 41, that is, the outer barrier layer 44 is disposed on the surface of the low refractive index layer 432 of the outermost laminated structure 43 facing away from the inner barrier layer 41. As Figure 10 shown, the reflective film layer 40 in this example has one laminated structure 43, and the outer barrier layer 44 is disposed on the surface of the low refractive index layer 432 of the laminated structure 43 facing away from the inner barrier layer 41. As Figure 11 shown, the reflective film layer 40 in this example has two laminated structures 43, and the outer barrier layer 44 is disposed on one side of the outermost laminated structure 43 in the positive X-axis direction from the inner barrier layer 41. Specifically, the outer barrier layer 44 is disposed on the surface of the low refractive index layer 432 of the second laminated structure 43 in the positive X-axis direction from the inner barrier layer 41 facing away from the inner barrier layer 41.

[0066] Among them, when the reflective film layer 40 is heat-treated, the outer barrier layer 44 helps to improve the thermal stability of the reflective film layer 40, prevent the improvement layer 42 in the reflective film layer 40 from being oxidized, and improve the mechanical and chemical stability of the reflective film layer 40. In one embodiment, the material of the outer barrier layer 44 is selected from at least one of nitrides of Si, Al, Zr, Ti, B, Ni elements and oxynitrides of their alloys. Examples of the outer barrier layer 44 include a Si3N4 layer (silicon nitride layer). The outer barrier layer 44 is preferably a silicon nitride layer doped with Al or Zr. In one embodiment, the thickness of the outer barrier layer 44 is 3 nm to 30 nm to avoid problems that the thickness of the outer barrier layer 44 is greater than 30 nm, which may affect the reflectivity of P-polarized light or the reflected appearance color.

[0067] In the reflective film layer 40 of the head-up display glass 100 provided in this embodiment, the outer barrier layer 44 is used to block the intrusion of oxygen in the environment into the reflective film layer 40, so as to prevent the improvement layer 42 in the reflective film layer 40 from being oxidized, which is beneficial to improving the mechanical and chemical stability of the reflective film layer 40. At the same time, it can also maintain that the reflective film layer 40 has a high reflectivity to P-polarized light and a low reflectivity to visible light, so that the head-up display glass 100 meets the requirements of automotive glass.

[0068] Examples 1-7 and Comparative Examples 1-4

[0069] Example 1

[0070] Example 1 provides a head-up display glass 100, which includes an outer glass plate 10, a polymer intermediate layer 30, an inner glass plate 20, and a reflective film layer 40 stacked in sequence. Among them, the reflective film layer 40 in this embodiment adopts the structure of the first example of the reflective film layer 40 in the above-mentioned second embodiment. Specifically, the structure of the reflective film layer 40 can be deposited on the inner glass plate 20 in sequence, then formed according to the high-temperature (550-650 °C) forming process of automotive glass, then the polymer intermediate layer 30 is sandwiched between the inner glass plate 20 and the outer glass plate 10, and finally high-pressure lamination is performed to form the head-up display glass 100.

[0071] From the fourth surface 22 of the inner glass plate 20 in the direction away from the outer glass plate 10, that is, from the inner glass plate 20 towards the vehicle interior, the reflective film layer 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 stacked in sequence. In this embodiment, the high refractive index layer 431 and the low refractive index layer 432 together form a stacked structure 43, and the improvement layer 42 is provided between the inner barrier layer 41 and the stacked structure 43.

[0072] Among them, the outer glass plate 10 and the inner glass plate 20 are both ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer intermediate layer 30 is polyvinyl butyral (PVB), with a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer, with a thickness of 10 nm. The improvement layer 42 is a NiCr layer, with a thickness of 1.5 nm. The high refractive index layer 431 in the stacked structure 43 is TiO X layer, with a thickness of 66 nm. The low refractive index layer 432 in the stacked structure 43 is a SiO2 layer, with a thickness of 72 nm. The outer barrier layer 44 is a Si3N4 layer, with a thickness of 10 nm.

[0073] Example 2

[0074] Example 2 provides a head-up display glass 100, which includes an outer glass plate 10, a polymer intermediate layer 30, an inner glass plate 20, and a reflective film layer 40 stacked in sequence. Among them, the outer glass plate 10 and the inner glass plate 20 are both ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer intermediate layer 30 is polyvinyl butyral (PVB), with a thickness of 0.76 mm.

[0075] From the fourth surface 22 of the inner glass plate 20 in the direction away from the outer glass plate 10, that is, from the inner glass plate 20 towards the vehicle interior, the reflective film layer 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 stacked in sequence. In this embodiment, the high refractive index layer 431 and the low refractive index layer 432 together form a stacked structure 43, and the improvement layer 42 is disposed in the stacked structure 43.

[0076] Among them, the inner barrier layer 41 is a Si3N4 layer, with a thickness of 33 nm. The high refractive index layer 431 is TiO X layer, with a thickness of 57 nm. The improvement layer 42 is a NiCr layer, with a thickness of 1.9 nm. The low refractive index layer 432 is a SiO2 layer, with a thickness of 86 nm. The outer barrier layer 44 is a Si3N4 layer, with a thickness of 6.5 nm.

[0077] Example 3

[0078] Example 3 provides a head-up display glass 100, which is different from that of Example 2 in that the reflective film layer 40 in the head-up display glass 100 of Example 3 does not include the outer barrier layer 44. The reflective film layer 40 in this embodiment adopts the structure of the third example of the reflective film layer 40 in the above first embodiment.

[0079] That is, in the direction away from the outer glass plate 10 from the fourth surface 22 of the inner glass plate 20, that is, in the direction from the inner glass plate 20 to the interior of the vehicle, the reflective film layer 40 includes an inner barrier layer 41, a high refractive index layer 431, an improvement layer 42, and a low refractive index layer 432 that are stacked in sequence. In this embodiment, the high refractive index layer 431 and the low refractive index layer 432 together form a stacked structure 43, and the improvement layer 42 is disposed in the stacked structure 43.

[0080] Example 4

[0081] Example 4 provides a head-up display glass 100, which includes an outer glass plate 10, a polymer intermediate layer 30, an inner glass plate 20, and a reflective film layer 40 that are stacked in sequence. In the direction away from the outer glass plate 10 from the fourth surface 22 of the inner glass plate 20, that is, in the direction from the inner glass plate 20 to the interior of the vehicle, the reflective film layer 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 that are stacked in sequence.

[0082] Among them, both the outer glass plate 10 and the inner glass plate 20 are ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer intermediate layer 30 is polyvinyl butyral (PVB), with a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer, with a thickness of 28 nm. The high refractive index layer 431 is a TiO X layer, with a thickness of 57 nm. The improvement layer 42 is a Ti layer, with a thickness of 3.5 nm. The low refractive index layer 432 is a SiO2 layer, with a thickness of 75 nm. The outer barrier layer 44 is a Si3N4 layer, with a thickness of 10 nm.

[0083] Example 5

[0084] Example 5 provides a head-up display glass 100, which includes an outer glass plate 10, a polymer intermediate layer 30, an inner glass plate 20, and a reflective film layer 40 that are stacked in sequence. In the direction away from the outer glass plate 10 from the fourth surface 22 of the inner glass plate 20, that is, in the direction from the inner glass plate 20 to the interior of the vehicle, the reflective film layer 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 that are stacked in sequence.

[0085] Among them, both the outer glass plate 10 and the inner glass plate 20 are ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer intermediate layer 30 is polyvinyl butyral (PVB), with a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer, with a thickness of 42 nm. The high refractive index layer 431 is a TiO XThe layer has a thickness of 60 nm. The improvement layer 42 is an Al layer with a thickness of 2 nm. The low refractive index layer 432 is a SiO2 layer with a thickness of 62 nm. The outer barrier layer 44 is a Si3N4 layer with a thickness of 12 nm.

[0086] Example 6

[0087] Example 5 provides a head-up display glass 100, which includes an outer glass plate 10, a polymer intermediate layer 30, an inner glass plate 20, and a reflective film layer 40 stacked in sequence. From the fourth surface 22 of the inner glass plate 20 in the direction away from the outer glass plate 10, that is, from the inner glass plate 20 towards the interior of the vehicle, the reflective film layer 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 stacked in sequence. The reflective film layer 40 in this example adopts the structure of the first example of the reflective film layer 40 in the second example above.

[0088] Among them, both the outer glass plate 10 and the inner glass plate 20 are ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer intermediate layer 30 is polyvinyl butyral (PVB), with a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer with a thickness of 52 nm. The improvement layer 42 is an amorphous Si layer with a thickness of 3.2 nm. The high refractive index layer 431 is a TiO X layer with a thickness of 35 nm. The low refractive index layer 432 is a SiO2 layer with a thickness of 98 nm. The outer barrier layer 44 is a Si3N4 layer with a thickness of 5 nm.

[0089] Example 7

[0090] Example 5 provides a head-up display glass 100, which includes an outer glass plate 10, a polymer intermediate layer 30, an inner glass plate 20, and a reflective film layer 40 stacked in sequence. From the fourth surface 22 of the inner glass plate 20 in the direction away from the outer glass plate 10, that is, from the inner glass plate 20 towards the interior of the vehicle, the reflective film layer 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 stacked in sequence. The reflective film layer 40 in this example adopts the structure of the first example of the reflective film layer 40 in the second example above.

[0091] Among them, both the outer glass plate 10 and the inner glass plate 20 are ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer intermediate layer 30 is polyvinyl butyral (PVB), with a thickness of 0.76 mm. The inner barrier layer 41 is a Si3N4 layer with a thickness of 50 nm. The improvement layer 42 is a crystalline Si layer with a thickness of 26 nm. The high refractive index layer 431 is a TiO XThe layer has a thickness of 35 nm. The low refractive index layer 432 is a SiO2 layer with a thickness of 49 nm. The outer barrier layer 44 is a Si3N4 layer with a thickness of 12 nm.

[0092] Comparative Example 1

[0093] Comparative Example 1 provides a head-up display glass, which includes an outer glass plate, a polymer interlayer, an inner glass plate, and a reflective film layer stacked in sequence. Among them, the reflective film layer includes a high refractive index layer and a low refractive index layer stacked in sequence. The high refractive index layer is attached to the inner glass plate, and no inner barrier layer, improvement layer, and outer barrier layer are provided in the reflective film layer.

[0094] Among them, both the outer glass plate and the inner glass plate are ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer interlayer is polyvinyl butyral (PVB) with a thickness of 0.76 mm. The high refractive index layer is a TiO X layer with a thickness of 72 nm. The low refractive index layer is a SiO2 layer with a thickness of 103 nm.

[0095] Comparative Example 2

[0096] Comparative Example 2 provides a head-up display glass, which includes an outer glass plate, a polymer interlayer, an inner glass plate, and a reflective film layer stacked in sequence. Among them, the reflective film layer includes a high refractive index layer and a low refractive index layer stacked in sequence. The high refractive index layer is attached to the inner glass plate, and no inner barrier layer, improvement layer, and outer barrier layer are provided in the reflective film layer.

[0097] Among them, both the outer glass plate and the inner glass plate are ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer interlayer is polyvinyl butyral (PVB) with a thickness of 0.76 mm. The high refractive index layer is a TiO X layer with a thickness of 62 nm. The low refractive index layer is a SiO2 layer with a thickness of 98 nm.

[0098] Comparative Example 3

[0099] The difference between the head-up display glass provided by Comparative Example 3 and the head-up display glass 100 of Example 1 is that the inner barrier layer 41 is not provided in the head-up display glass of Comparative Example 3.

[0100] Comparative Example 4

[0101] Comparative Example 4 provides a head-up display glass, which includes an outer glass plate, a polymer interlayer, an inner glass plate, and a reflective film layer stacked in sequence. From the surface of the inner glass plate in the direction away from the outer glass plate, that is, from the inner glass plate towards the interior of the vehicle, the reflective film layer includes an inner barrier layer, a high refractive index layer, a low refractive index layer, an improvement layer, and an outer barrier layer stacked in sequence. The high refractive index layer and the low refractive index layer in Comparative Example 4 together form a stacked structure, and the improvement layer is provided between the stacked structure and the outer barrier layer.

[0102] Among them, both the outer glass plate and the inner glass plate are ordinary transparent glasses (white glass with a visible light transmittance ≥ 70%), with a thickness of 2.1 mm each. The polymer interlayer is polyvinyl butyral (PVB), with a thickness of 0.76 mm.

[0103] The inner barrier layer is a Si3N4 layer with a thickness of 7 nm. The high refractive index layer is a TiO X layer with a thickness of 64 nm. The low refractive index layer is a SiO2 layer with a thickness of 92 nm. The improvement layer is a NiCr layer with a thickness of 1.5 nm. The outer barrier layer is a Si3N4 layer with a thickness of 6 nm.

[0104] Measure the optical indexes of the head-up display glasses of Examples 1 to 7 and Comparative Examples 1 to 4: Measure the visible light transmittance of the head-up display glass and measure the P-polarized light reflectance and visible light reflection color of the head-up display glass from the side of the reflective film layer. Record the results of Examples 1 to 3 and Comparative Examples 1 to 4 in Table 1, and record the results of Examples 4 to 7 in Table 2.

[0105] Table 1 Optical indexes of the head-up display glasses of Examples 1 to 3 and Comparative Examples 1 to 4

[0106]

[0107] Head-up display glasses generally require simultaneously meeting the requirements that the reflectance of visible light < 15% and the reflectance of P-polarized light incident at an incident angle of 60° ≥ 15%, and the reflectance of P-polarized light incident at an incident angle of 65° ≥ 20%. According to Table 1, by comparing Comparative Example 1 and Comparative Example 2, it can be seen that the reflective film layers of Comparative Example 1 and Comparative Example 2 only adopt a stacked structure of a high refractive index layer and a low refractive index layer (TiO X / (SiO2)), it is impossible to simultaneously meet the requirements for the reflectivity of P-polarized light and the reflectivity of visible light of the head-up display glass only by adjusting the thicknesses of the high-refractive-index layer and the low-refractive-index layer. For example, the head-up display glass in Comparative Example 1 meets the requirement that the reflectivity of visible light is less than 15%, but the reflectivities of P-polarized light incident at incident angles of 60° and 65° do not meet the requirements. The head-up display glass in Comparative Example 2 meets the requirements for the reflectivities of P-polarized light incident at incident angles of 60° and 65°, but the reflectivity of visible light does not meet the requirement of being less than 15%. This shows that only by adjusting the thicknesses of the high-refractive-index layer and the low-refractive-index layer, the reflectivity of P-polarized light can be improved to a certain extent. However, as the reflectivity of P-polarized light increases, the reflectivity of visible light also increases correspondingly and even exceeds 15%, not meeting the requirements. Therefore, through analysis, it can be seen that only by setting the stacked structure cannot simultaneously meet the requirements that the head-up display glass has a high reflectivity for P-polarized light and a low reflectivity for visible light.

[0108] According to the data of Examples 1 to 3, in the embodiments of the present application, by providing an inner barrier layer and an improvement layer in the reflective film layer, the reflectivity of the head-up display glass for P-polarized light incident at 60° to 73° is increased to 17% to 35%, or even higher. At the same time, the reflectivity of visible light can still be maintained at <15%, and the head-up display glass can obtain a neutral color. In addition, by comparing Example 3 with Example 2, it can be seen that when the outer barrier layer is not used, the overall thermal stability performance of the reflective film layer is slightly reduced, but the formed head-up display glass can still simultaneously meet the requirements for the reflectivities of P-polarized light and visible light.

[0109] By comparing Comparative Example 3 with Examples 1 to 2, no inner barrier layer is provided in the reflective film layer of Comparative Example 3, 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 damages and oxidizes the improvement layer, thereby reducing the reflection ability of the head-up display glass for P-polarized light.

[0110] By comparing Comparative Example 4 with Examples 1 to 2, although an improvement layer is provided in the reflective film layer of Comparative Example 4, the improvement layer is provided between the stacked structure (TiO X / (SiO2)) and the outer barrier layer (Si3N4). Specifically, the improvement layer is provided on the low-refractive-index layer in the stacked structure. After P-polarized light and visible light are incident on the reflective film layer from inside the vehicle, P-polarized light and visible light will first be absorbed and reflected by the improvement layer and then pass through the high-refractive-index layer / low-refractive-index layer, resulting in a decrease in the overall performance of the reflective film layer. The visible light transmittance of the formed head-up display glass is less than 70%, and the reflectivity of P-polarized light is less than 15% or 20%, all of which do not meet the requirements.

[0111] Table 2 Optical Indexes of Head-Up Display Glass for Examples 4 to 7

[0112]

[0113]

[0114] As can be seen from Table 1 and Table 2, for the head-up display glass provided in Examples 1 to 7 of the present application, the reflectivity of P-polarized light incident at 60° to 73° increases to 17% to 35%, or even higher, while the reflectivity of visible light can still be maintained at <15%, and a neutral color can be obtained, meeting the requirements of automotive glass. By comparing Examples 6 and 7, it can be seen that when a material with a crystal structure such as nanocrystalline silicon is used as the improvement layer, due to the reflection characteristics and transmission characteristics of crystalline silicon for P-polarized light, compared with amorphous silicon, the reflective film layer formed with crystalline silicon as the improvement layer can, to a certain extent, increase the reflectivity of P-polarized light while maintaining a high visible light transmittance and a low visible light reflectivity.

[0115] The above-disclosed are only the preferred embodiments of the present application. Of course, the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand the entire or partial processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A head-up display glass, characterized in that, It includes laminated glass and a reflective film layer, and the reflective film layer can reflect P-polarized light; The laminated glass includes an outer glass plate, a polymer intermediate layer, and an inner glass plate, and the polymer intermediate layer is sandwiched between the outer glass plate and the inner glass plate; The reflective film layer includes an inner barrier layer, an improvement layer, and at least one stacked structure arranged in layers. The inner barrier layer is provided on the surface of the inner glass plate facing away from the polymer intermediate layer. The stacked structure includes a high refractive index layer and a low refractive index layer stacked in sequence in the direction away from the inner barrier layer. The refractive index of the high refractive index layer is ≥1.8, and the refractive index of the low refractive index layer is <1.

7. The material of the improvement layer is selected from at least one of the simple substances and their alloys of elements such as Ni, Cr, Fe, Ti, Mo, Cu, Al, Au, Sn, Zr, In, Si, Nb, and Ge; The improvement layer is provided between the inner barrier layer and the stacked structure; alternatively, the improvement layer is provided between the high refractive index layer and the low refractive index layer; The reflectivity of the head-up display glass for P-polarized light incident at an incident angle θ is Y, 60°≤θ≤75°, Y≥15%, and the reflectivity of the head-up display glass for vertically incident visible light is ≤15%.

2. The head-up display glass according to claim 1, characterized in that, When 65°≤θ≤75°, Y≥20%.

3. The head-up display glass according to claim 1, wherein When 70°≤θ≤75°, Y≥27%.

4. The head-up display glass according to claim 1, wherein, The material of the inner barrier layer is selected from at least one of the oxides of elements such as Zn, Sn, Ti, Si, Al, Nb, Zr, Ni, Mg, Cr, Ta and their alloy oxides, or selected from at least one of the nitrides of elements such as Si, Al, Zr, B, Ti and their alloy nitrides.

5. The head-up display glass according to claim 1, characterized in that, The simple substance or alloy in the improvement layer has a crystal structure, and the thickness of the improvement layer is 1nm~40nm.

6. The head-up display glass according to claim 5, characterized in that, The thickness of the improvement layer is greater than 5nm, or the thickness of the improvement layer is 10nm~30nm.

7. The head-up display glass according to claim 1, characterized in that, The simple substance or alloy in the improvement layer has an amorphous structure, and the thickness of the improvement layer is 1nm~5nm.

8. The head-up display glass according to claim 1, wherein The reflective film layer further includes an outer barrier layer, and the outer barrier layer is provided on the surface of the at least one stacked structure away from the inner barrier layer. The material of the outer barrier layer is selected from at least one of the nitrides of elements such as Si, Al, Zr, Ti, B, Ni and their alloy oxynitrides; the thickness of the outer barrier layer is 3nm~30nm.

9. The head-up display glass according to claim 1, wherein, The difference between the refractive index of the inner glass plate and the refractive index of the polymer intermediate layer is not greater than 0.1, and the difference between the refractive index of the outer glass plate and the refractive index of the polymer intermediate layer is not greater than 0.

1.

10. The head-up display glass according to claim 1, characterized in that, The range of the a value in the Lab value of the reflection color of the head-up display glass measured from the side of the reflective film layer is between -8 and 3, and the range of the b value is between -12 and 0.

11. The head-up display glass according to claim 1, characterized in that, When the reflective film layer has one stacked structure, the improvement layer is located between the inner barrier layer and the high refractive index layer in the stacked structure; When the reflective film layer has multiple stacked structures, the improvement layer is located between the inner barrier layer and the high refractive index layer of the first set stacked structure.

12. The head-up display glass according to claim 1, wherein, When the reflective film layer has a laminated structure, the improvement layer is located between the high refractive index layer and the low refractive index layer of the laminated structure; When the reflective film layer has a plurality of laminated structures, the improvement layer is located between two adjacent laminated structures, or between the high refractive index layer and the low refractive index layer of any one laminated structure.

13. The head-up display glass according to claim 1, characterized in that, The reflectivity of the head-up display glass to P-polarized light incident at an incident angle of 60° to 73° is 17% to 35%, and the reflectivity of the head-up display glass to visible light is <15%.

14. The head-up display glass according to claim 1, wherein, The refractive index of the high refractive index layer is ≥2.0, or ≥2.2; the thickness of the high refractive index layer is 30 nm to 85 nm, or 40 nm to 65 nm.

15. The head-up display glass according to claim 1, characterized in that, The thickness of the low refractive index layer is 35 nm to 130 nm; or the thickness of the low refractive index layer is 50 nm to 100 nm.

16. The head-up display glass according to claim 1, wherein, The thickness of the inner barrier layer is ≥3 nm, or the thickness of the inner barrier layer is ≥5 nm.

17. A head-up display system, characterized in that, Including a projection light source and the head-up display glass according to any one of claims 1 to 16, the projection light rays generated by the projection light source contain at least 80% of P-polarized light, and the P-polarized light is projected onto the reflective film layer.

Images