Glass for a head-up display and a head-up display system including the same

Abstract

A glass for a head-up display (HUD) is provided. The glass for the HUD includes a laminated glass (10) having a first surface (10-1) and a second surface (10-2) facing each other, and the second surface (10-2) has a display area (31) and a non-display area (32). In the display area (31), a first nanofilm (20-1) is provided, and the first nanofilm (20-1) includes at least one first high refractive index layer (21-1) and at least one first low refractive index layer (22-1) alternately stacked from the second surface (10-2) outward, the first high refractive index layer (21-1) having a refractive index of 1.9 to 2.7, and the first low refractive index layer (22-1) having a refractive index of 1.3 to 1.8. The reflectance of the display area (31) for P-polarized light incident at 55° to 75° is 10% or more, and the reflectance of the non-display area (32) for visible light incident at 0° to 10° is less than the reflectance of the display area (31) for visible light incident at 0° to 10°. This HUD glass is not only low cost, but also provides a clear HUD image and little visual interference from the glass, ensuring safety and comfort while driving. Further, a HUD system is provided.

Description

Technical Field

[0001] Cross - reference to related applications This application claims the priority of the prior application with the title of "Glass for Head - Up Display and Head - Up Display System Containing the Same" and the Chinese Patent Application No. 202111230958.6 filed on October 21, 2021. All the contents of the above - mentioned prior application are incorporated into this application by reference.

[0002] This application relates to the technical field of Head - Up Display (HUD), and specifically, to glass for HUD and a HUD system including the same.

Background Art

[0003] HUD is being increasingly widely applied in automobiles. An in - vehicle HUD system utilizes the principle of light reflection to display important driving information on the front windshield. In existing front windshields, in order to realize the function of HUD, a generally wedge - shaped polyvinyl butyral (PVB) layer is used as the intermediate layer of the front windshield. However, the manufacturing process of the wedge - shaped PVB layer is complex, the cost is high, and the applicability is poor. Therefore, it is necessary to use PVB layers with different specifications according to different vehicle models. Therefore, in order to solve the problems of high cost and poor applicability of existing glass for HUD, it is necessary to provide a new type of glass for HUD.

Summary of the Invention

[0004] In view of the above, this application provides glass for HUD that not only has a low cost, but also has a clear HUD image and less visual interference of the glass, so as to ensure driving safety and comfort.

[0005] In a first aspect, the present application provides a glass for a HUD. The glass for a HUD includes a laminated glass having a first surface and a second surface facing away from each other, and the second surface has a display area and a non-display area. In the display area, a first nanofilm is provided, and the first nanofilm includes at least one first high refractive index layer and at least one first low refractive index layer laminated alternately outward from the second surface. The refractive index of the first high refractive index layer is 1.9 to 2.7, and the refractive index of the first low refractive index layer is 1.3 to 1.8. The reflectivity of the display area for P-polarized light incident at 55° to 75° is 10% or more, and the reflectivity of the non-display area for visible light incident at 0° to 10° is smaller than the reflectivity of the display area for visible light incident at 0° to 10°.

[0006] In the glass for a HUD of the present application, since a nanofilm is provided in the display area, the display area has a relatively high P-polarized light reflectivity. Therefore, it is ensured that the display area can display a clear image. Due to the design that the reflectivity of the non-display area for visible light incident at 0° to 10° is smaller than the reflectivity of the display area for visible light incident at 0° to 10°, the mirror effect of the non-display area is weakened, the visual interference of reflection in the non-display area is reduced, and the safety and comfort during driving can be ensured.

[0007] Optionally, the difference between the reflectivity of the display area for visible light incident at 0° to 10° and the reflectivity of the non-display area for visible light incident at 0° to 10° is 2% or more.

[0008] Optionally, the reflectivity of the display area for visible light incident at 0° to 10° is 10% to 30%.

[0009] Optionally, the reflectivity of the non-display area for visible light incident at 0° to 10° is 1% to 15%.

[0010] Optionally, the reflectivity of the non-display area for P-polarized light incident at 55° to 75° is smaller than the reflectivity of the display area for P-polarized light incident at 55° to 75°.

[0011] Optionally, the second surface further has a transition region located between the display region and the non-display region, and the reflectance of the transition region for visible light incident at 0° to 10° is greater than the reflectance of the non-display region for visible light incident at 0° to 10°, and is less than the reflectance of the display region for visible light incident at 0° to 10°.

[0012] Optionally, the non-display region is an exposed cover glass.

[0013] Optionally, in the non-display region, a second nanofilm is provided, and the second nanofilm includes at least one second high refractive index layer and at least one second low refractive index layer provided alternately outward from the second surface. The refractive index of the second high refractive index layer is 1.9 to 2.7, the refractive index of the second low refractive index layer is 1.3 to 1.8, and the thickness of the second nanofilm is smaller than the thickness of the first nanofilm.

[0014] Optionally, the thickness of the second high refractive index layer is smaller than the thickness of the first high refractive index layer.

[0015] Optionally, the thickness of the second low refractive index layer is smaller than the thickness of the first low refractive index layer.

[0016] Optionally, the first low refractive index layer includes at least two first low refractive index sub-layers, the second low refractive index layer includes at least two second low refractive index sub-layers, and the thickness of the first low refractive index sub-layer farthest from the cover glass in the first low refractive index layer is greater than the thickness of the second low refractive index sub-layer farthest from the cover glass in the second low refractive index layer.

[0017] Optionally, the first high refractive index layer includes at least two first high refractive index sub-layers, the second high refractive index layer includes at least two second high refractive index sub-layers, and the thickness of the first high refractive index sub-layer closest to the cover glass in the first high refractive index layer is greater than the thickness of the second high refractive index sub-layer closest to the cover glass in the second high refractive index layer.

[0018] Optionally, among the Lab values of the color in the display area and the Lab values of the color in the non-display area, the a values are both 2 or less, and the b values are both 2 or less.

[0019] Optionally, the absolute value of the difference between the a value of the color in the display area and the a value of the color in the non-display area is 2 or less, and the absolute value of the difference between the b value of the color in the display area and the b value of the color in the non-display area is 2 or less.

[0020] Optionally, the HUD glass further includes one or more of an anti-fingerprint film, a heat-insulating film, an electrically heated film, an ultraviolet-cutting film, and an anti-fogging film.

[0021] Optionally, in the non-display area, a second nanofilm is provided. The second nanofilm includes at least one second high refractive index layer and at least one second low refractive index layer that are alternately provided outward from the second surface. The refractive index of the second high refractive index layer is 1.9 to 2.7, and the refractive index of the second low refractive index layer is 1.3 to 1.8. The second nanofilm is different from the first nanofilm.

[0022] Optionally, the second nanofilm and the first nanofilm are different in at least one of the material of each layer, the arrangement of each layer, and the thickness of each layer.

[0023] Optionally, the second nanofilm and the first nanofilm have the same material of each layer and the same arrangement of each layer, and the thickness of at least one layer is different among the thicknesses of each layer.

[0024] Optionally, the first nanofilm or the second nanofilm is manufactured by a film removal method or a non-uniform coating method. The film removal method includes one or more of a dry etching method, a wet etching method, and a masking method.

[0025] Optionally, the first nanofilm first forms the second nanofilm in the display area and the non-display area, and then performs film removal on the second nanofilm in the display area by a film removal method. i. Fabricate a first nanofilm in the display areaIt is obtained by such a method, or the second nanofilm first forms a first nanofilm in the display area and the non-display area, and then performs film removal on the first nanofilm in the non-display area by a film removal method. i. Fabricate a second nanofilm in the non-display area It is obtained by such a method.

[0026] In a second aspect of the present application, a head-up display (HUD) system is provided. The HUD system includes a projection unit for generating P-polarized light and the glass for HUD described in the first aspect, and the P-polarized light is incident on the display area.

[0027] Since the HUD system provided in the second aspect of the present application employs the glass for HUD of the present application, it can present a clear image, has less visual interference, and has relatively high safety and comfort.

Brief Description of the Drawings

[0028] FIG. 1 is a schematic diagram showing the structure of the glass for HUD according to one embodiment of the present application. FIG. 2 is a schematic diagram showing the structure of the laminated glass according to one embodiment of the present application. FIG. 3 is a schematic diagram showing the structure of the nanofilm according to one embodiment of the present application. FIG. 4 is a schematic diagram showing the structure of the nanofilm according to another embodiment of the present application. FIG. 5 is a schematic diagram showing the structure of the nanofilm according to another embodiment of the present application. FIG. 6 is a schematic diagram showing the structure of the glass for HUD according to another embodiment of the present application. FIG. 7 is a schematic diagram showing the structure of the glass for HUD according to another embodiment of the present application. FIG. 8 is a schematic diagram showing the structure of the nanofilm according to one embodiment of the present application. FIG. 9 is a schematic diagram showing the structure of the nanofilm according to another embodiment of the present application. FIG. 10 is a schematic diagram showing the structure of the nanofilm according to another embodiment of the present application. FIG. 11 is a schematic diagram showing the partition of the second surface of the laminated glass according to one embodiment of the present application. FIG. 12 is a schematic diagram showing the partition of the second surface of the laminated glass according to another embodiment of the present application. FIG. 13 is a schematic diagram showing the partition of the second surface of the laminated glass according to another embodiment of the present application. FIG. 14 is a schematic diagram showing the partition of the second surface of the laminated glass according to another embodiment of the present application. FIG. 15 is a schematic diagram showing the partition of the second surface of the laminated glass according to another embodiment of the present application. FIG. 16 is a schematic diagram showing the structure of the glass for HUD according to another embodiment of the present application. FIG. 17 is a schematic diagram showing the structure of the HUD system according to one embodiment of the present application.

MODE FOR CARRYING OUT THE INVENTION

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

[0030] For ease of understanding, some terms related to the present application are explained as follows. The refractive index refers to the refractive index of the material when the wavelength of the transmitted light is 550 nm. The visible light reflectance refers to the visible light reflectance when the incident angle is 0° to 10° (i.e., when incident perpendicularly). The direction from the second surface outward means the direction away from the laminated glass body from the second surface of the laminated glass.

[0031] Referring to FIG. 1, FIG. 1 is a schematic diagram showing the structure of the glass for HUD according to one embodiment of the present application. The glass for HUD includes a laminated glass 10 having opposite first surface 10-1 and second surface 10-2, and a nanofilm 20 is provided on the second surface 10-2 of the laminated glass 10. Referring to FIG. 2, FIG. 2 is a schematic diagram showing the structure of the laminated glass according to one embodiment of the present application. The laminated glass 10 includes an outer glass plate 11, an inner glass plate 13, and an intermediate layer 12 provided between the outer glass plate 11 and the inner glass plate 13. The outer glass plate 11 has a first surface 11-1 and a second surface 11-2, and the first surface 11-1 of the outer glass plate 11 is, that is, the first surface 10-1 of the laminated glass 10 . The inner glass plate 13 has a first surface 13-1 and a second surface 13-2, and the first surface 13-1 of the inner glass plate 13 is, that is, the second surface 10-2 of the laminated glass 10 . The second surface 11-2 of the outer glass plate 11 and the second surface 13-2 of the inner glass plate 13 are adhesively fixed to the two surfaces of the intermediate layer 12 respectively. When the glass for HUD of the present application is applied, the first surface 13-1 of the inner glass plate 13 is located inside the vehicle window (inside the automobile), that is, the second surface 10-2 of the laminated glass 10 is located inside the vehicle window. The first surface 11-1 of the outer glass plate 11 is located outside the vehicle window (outside the automobile), that is, the first surface 10-1 of the laminated glass 10 is located outside the vehicle window. In the embodiment of the present application, the nanofilm 20 is provided on the first surface 13-1 of the inner glass plate 13.

[0032] In an embodiment of the present application, the nanofilm includes at least one high refractive index layer and at least one low refractive index layer that are alternately laminated. The refractive index of the high refractive index layer is 1.9 or more, and the refractive index of the low refractive index layer is 1.8 or less. Referring to FIG. 3, FIG. 3 is a schematic diagram showing the structure of a nanofilm according to one embodiment of the present application. In the glass for HUD, the nanofilm 20 includes a high refractive index layer 21 and a low refractive index layer 22 that are alternately laminated along the outward direction, and the outward direction is the direction from the second surface of the laminated glass to the outside. The nanofilm having the above structure can effectively improve the P-polarized light reflectivity of the glass for HUD and improve the sharpness of the image while satisfying the good light transmittance of the glass for HUD.

[0033] In an embodiment of the present application, the high refractive index layer is made of a high refractive index material. The refractive index of the high refractive index material is 1.9 or more. Specifically, the refractive index of the high refractive index material can be 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, or higher, but is not limited thereto. By reasonably designing the material and thickness of the high refractive index layer, the nanofilm can have excellent mechanical properties, chemical properties, and thermal stability, and can have a relatively long service life. In addition, the P-polarized light reflectivity of the nanofilm can be further improved, and other optical indicators can also be optimized. In some embodiments of the present application, the refractive index of the high refractive index material is 1.9 to 2.7. In some embodiments of the present application, the high refractive index layer includes a plurality of high refractive index sub-layers. Specifically, the high refractive index sub-layer can have 2 layers, 3 layers, 4 layers, or 5 layers, but is not limited thereto. Referring to FIG. 4, FIG. 4 is a schematic diagram showing the structure of a nanofilm according to another embodiment of the present application. In FIG. 4, the nanofilm 20 includes a high refractive index layer 21 and a low refractive index layer 22. The high refractive index layer 21 includes a high refractive index sub-layer 21a and a high refractive index sub-layer 21b. The high refractive index sub-layer 21a is closer to the second surface 10-2 of the laminated glass 10. In some embodiments of the present application, the refractive index of the high refractive index sub-layer 21a is 1.9 to 2.2, and the refractive index of the high refractive index sub-layer 21b is 2.3 or more. In some embodiments of the present application, the high refractive index layer includes two or more high refractive index sub-layers. The refractive index of any one high refractive index sub-layer is greater than the refractive index of another high refractive index sub-layer closer to the second surface 10-2 of the laminated glass 10. For example, the high refractive index layer includes three high refractive index sub-layers. The three high refractive index sub-layers are, respectively, a high refractive index sub-layer a, a high refractive index sub-layer b, and a high refractive index sub-layer c along the direction away from the second surface 10-2 of the laminated glass 10. The high refractive index sub-layer a is close to the inner glass plate, and the high refractive index sub-layer c is close to the low refractive index layer. In this case, the refractive index of the high refractive index sub-layer b is greater than the refractive index of the high refractive index sub-layer a, and the refractive index of the high refractive index sub-layer c is greater than the refractive index of the high refractive index sub-layer b.

[0034] In some embodiments of the present application, the high refractive index material contains oxides of at least one element among Zn, Sn, Ti, Nb, Zr, Ni, In, Al, Ce, W, Mo, Sb, and Bi. In some embodiments of the present application, the high refractive index material contains nitrides or oxynitrides of at least one element among Si, Al, Zr, Y, Ce, and La. In some embodiments of the present application, the refractive index of the high refractive index material is 2.35 or more, and the high refractive index material is TiO x TiO x N y or one or more selected from doped TiO x . In some embodiments of the present application, the refractive index of the high refractive index material is 1.9 or more and 2.35 or less, and the high refractive index material is ZnSnO x Si 3 N 4 ZnO, or AZO (aluminum-doped zinc oxide).

[0035] In an embodiment of the present application, the low refractive index layer is made of a low refractive index material, the refractive index of the low refractive index material is 1.8 or less, and the refractive index of the low refractive index material can be specifically 1.8, 1.7, 1.6, 1.55, 1.4, 1.3, or lower, but is not limited thereto. By reasonably designing the material and thickness of the low refractive index layer, the nanofilm can have excellent mechanical properties, chemical properties, and thermal stability, and can have a relatively long service life. In addition, the P-polarized reflectance of the nanofilm can be further improved, and other optical indicators can also be optimized. In some embodiments of the present application, the refractive index of the low refractive index material is 1.3 to 1.8. In some embodiments of the present application, the low refractive index layer includes a plurality of low refractive index sub-layers, and the low refractive index sub-layers can specifically have 2 layers, 3 layers, 4 layers, or 5 layers, but are not limited thereto. In some embodiments of the present application, the refractive index of the low refractive index material is 1.55 or less, and the low refractive index material is SiO 2 Al 2 O 3 or MgF 2It can be one or more selected from among them. In some embodiments of the present application, the low refractive index material includes a material having an antireflection function, and the material having an antireflection function is porous SiO 2 or porous Al 2 O 3 It may be. In some embodiments of the present application, the low refractive index layer is a film layer having a stepped refractive index such as a moth-eye film or a gradient film.

[0036] In some embodiments of the present application, there are a plurality of high refractive index layers and low refractive index layers, that is, the nanofilm includes at least two high refractive index layers and at least two low refractive index layers. Referring to FIG. 5, FIG. 5 is a schematic diagram showing the structure of a nanofilm according to another embodiment of the present application. The nanofilm includes two high refractive index layers and two low refractive index layers. The high refractive index layers and the low refractive index layers are alternately laminated, that is, the high refractive index layer 21, the low refractive index layer 22, the high refractive index layer 23, and the low refractive index layer 24 are alternately laminated.

[0037] During driving, in order to ensure safe driving, it is desirable for the HUD glass to present a clear image so that the driver can easily obtain driving information. At the same time, it is desirable to clearly see the situation outside the vehicle through the HUD glass. The nanofilm of the present application has a relatively high P-polarized reflectance R p and thus can clearly present an image in the display area. However, since the nanofilm has a relatively high P-polarized reflectance R pWhen having [a certain property], since the nanofilm also has a relatively high visible light reflectivity, when using the glass for HUD as the front windshield of a vehicle, a mirror effect occurs on the inner surface of the front windshield, causing the objects inside the vehicle to be reflected on the inner surface of the front windshield, which may thereby affect the driver's visual comfort and further the driving safety. To solve the above problems, the inventor of the present application has improved the glass for HUD, so that the glass for HUD can present a clear image while having a relatively good visual effect. In the glass for HUD of the present application, the second surface of the laminated glass has a display area (HUD area) and a non-display area (LR (low reflectivity) area). The display area refers to the area where the projection unit projects P-polarized light, that is, the area where driving information is displayed, and the non-display area refers to the area where there is no need to display driving information in the glass for HUD. In an embodiment of the present application, the visible light reflectivity of the non-display area is smaller than that of the display area.

[0038] In an embodiment of the present application, a nanofilm is provided on the display area of the second surface of the laminated glass. This nanofilm can improve the P-polarized light reflectivity of the display area, and thus, a clear HUD image can be displayed in front of the laminated glass. In an embodiment of the present application, the P-polarized light reflectivity of the display area is 10% or more, the incident angle of the P-polarized light is 55° - 75°, and the incident angle of the P-polarized light can specifically be 55°, 60°, 65°, 70°, or 75°, but is not limited thereto. In the present application, the P-polarized light reflectivity of the display area can specifically be 10%, 13%, 15%, 20%, or 25%, but is not limited thereto. In an embodiment of the present application, the reflectivity of the non-display area for the P-polarized light incident at 55° - 75° is smaller than the reflectivity of the display area for the P-polarized light incident at 55° - 75°.

[0039] In some embodiments of the present application, the glass for HUD has a visible light transmittance in the display area greater than 70%, thereby ensuring driving safety as much as possible. In some embodiments of the present application, considering that the display area only occupies a part of the glass for HUD, even if the display area has a relatively high visible light reflectivity and a relatively low visible light transmittance, the visual impact on the whole glass for HUD is relatively small. The visible light transmittance in the display area of the glass for HUD may be 50% - 70%, thereby improving the sharpness of the image in the display area while ensuring driving safety. In the embodiments of the present application, the visible light transmittance in the non-display area of the glass for HUD is 70% or more.

[0040] In the embodiments of the present application, the visible light reflectivity of the display area is 10% or more. In some embodiments of the present application, the visible light reflectivity R H of the display area is 10% - 30%, and the visible light reflectivity of the display area may specifically be 10%, 15%, 20%, 25%, or 30%, but is not limited thereto. In the embodiments of the present application, the visible light reflectivity of the non-display area is 1% - 15%. In some embodiments of the present application, the visible light reflectivity of the non-display area is 1% - 5%, and the visible light reflectivity of the non-display area may specifically be 1%, 2%, 3%, 4%, or 5%, but is not limited thereto. In some embodiments of the present application, the visible light reflectivity of the non-display area is 6% - 8%, and the visible light reflectivity of the non-display area may specifically be 6%, 7%, or 8%, but is not limited thereto. In some embodiments of the present application, the visible light reflectivity of the non-display area is 9% - 15%, and the visible light reflectivity of the non-display area may specifically be 9%, 10%, 11%, 12%, 13%, 14%, or 15%, but is not limited thereto.

[0041] In the present application, the difference between the visible light reflectance of the display area and the visible light reflectance of the non-display area is 2% or more. Specifically, the difference between the visible light reflectance of the display area and the visible light reflectance of the non-display area may be 2%, 5%, 7%, 10%, or 15%, but is not limited thereto. The greater the difference between the visible light reflectance of the display area and the visible light reflectance of the non-display area, the more the comfort of the HUD glass is improved, and the clearer the image of the HUD becomes.

[0042] In some embodiments of the present application, no nanofilm is provided in the non-display area of the second surface of the laminated glass, and the non-display area is the exposed laminated glass. That is, on the second surface of the laminated glass, the nanofilm is provided only in the display area, and the nanofilm covers only a partial area of the second surface. With this structure, it is possible to avoid visual interference caused by the mirror effect of the nanofilm. Referring to FIG. 6, FIG. 6 is a schematic diagram showing the structure of the HUD glass according to another embodiment of the present application. In FIG. 6, a nanofilm 20 is provided on the second surface 10-2 of the laminated glass 10, and the area of the nanofilm 20 is smaller than the area of the second surface 10-2. When the non-display area is the exposed laminated glass, the visible light reflectance R L of the non-display area is the visible light reflectance of the second surface of the laminated glass. In the embodiment of the present application, the visible light reflectance of the second surface of the laminated glass is 6% to 8%. Specifically, the visible light reflectance of the second surface of the laminated glass may be 6%, 6.5%, 7%, or 8%, but is not limited thereto.

[0043] In some embodiments of the present application, a nanofilm is also provided in the non-display area. To ensure that the visible light reflectance of the non-display area is smaller than that of the display area, the nanofilm in the non-display area is not the same as the nanofilm in the display area. Since the nanofilm has a certain reflection color, the nanofilm in the non-display area may destroy the color consistency of the overall appearance of the glass and also affect the visual effect of the HUD glass. In some embodiments of the present application, the absolute value of the difference between the a value of the color in the display area and the a value of the color in the non-display area is 2 or less. For example, when the a value of the color in the display area is -3, the color of the non-display area a value of is between (-5) and (-1). In some embodiments of the present application, the absolute value of the difference between the b value of the color in the display area and the b value of the color in the non-display area is 2 or less. For example, when the b value of the color in the display area is -8, the b value of the color in the non-display area is between (-10) and (-6). The smaller the absolute value of the difference between the a value of the color in the display area and the a value of the color in the non-display area, and the smaller the absolute value of the difference between the b value of the color in the display area and the b value of the color in the non-display area, the smaller the color difference between the display area and the non-display area, and the better the appearance consistency of the HUD glass. Here, the Lab value is based on the Lab color model, and the L value, a value, and b value correspond to L, a, and b in the Lab value (or Lab color value), respectively. L is the luminance channel, and a and b are two color channels. In some embodiments of the present application, the difference between the a value of the color in the display area and the a value of the color in the non-display area is 2 or less, and preferably, the difference between the a value of the color in the display area and the a value of the color in the non-display area is between (-8) and 0. The difference between the b value of the color in the display area and the b value of the color in the non-display area is 2 or less, and preferably, the difference between the b value of the color in the display area and the b value of the color in the non-display area is between (-12) and 0. The nanofilm having a values and b values within the above ranges exhibits intermediate colors, so the HUD glass can have a relatively good visual effect.

[0044] In this application, when a nanofilm is provided in the non-display area, the nanofilm in the display area is the first nanofilm, and the nanofilm in the non-display area is the second nanofilm. The second nanofilm and the first nanofilm are different in at least one of the materials of each layer, the arrangement of each layer, and the thickness of each layer. For ease of production and manufacturing, preferably, the second nanofilm and the first nanofilm have the same materials of each layer and the same arrangement of each layer, and at least one layer has a different thickness among the thicknesses of each layer. In the embodiments of this application, the visible light reflectivity of the first nanofilm is greater than that of the second nanofilm, and the P-polarized light reflectivity of the first nanofilm is greater than that of the second nanofilm. Referring to FIG. 7, FIG. 7 is a schematic diagram showing the structure of the glass for HUD according to another embodiment of this application. In FIG. 7, the nanofilm 20 includes a first nanofilm 20-1 and a second nanofilm 20-2. The first nanofilm 20-1 is provided in the display area of the second surface 10-2 of the laminated glass, and the second nanofilm 20-2 is provided in the non-display area of the second surface 10-2 of the laminated glass. The lower the visible light reflectivity of the second nanofilm, the more helpful it is to improve the safety and comfort during vehicle driving. In some embodiments of this application, the difference between the visible light reflectivity of the first nanofilm and the visible light reflectivity of the second nanofilm is 2% or more. As can be understood, since the first nanofilm is provided in the display area and the second nanofilm is provided in the non-display area, the visible light reflectivity R H of the display area and the visible light reflectivity R L of the non-display area have a difference of 2% or more. R H and R L The greater the difference between them, the better the visual effect of the glass for HUD. The display area can clearly display driving information, and the situation outside the vehicle can be clearly seen through the non-display area. The visible light reflectivity R H of the display area and the visible light reflectivity R L of the non-display area may specifically be 2%, 3%, 4%, 5%, 6%, or higher, but is not limited thereto. In some embodiments of this application, the visible light reflectivity of the display area is 16%, and the visible light reflectivity of the non-display area is 14%. The visible light reflectivity RH and the visible light reflectance R of the non-display area L The difference from is 2%.

[0045] In some embodiments of the present application, the thickness of the second nanofilm is smaller than the thickness of the first nanofilm. When the thickness of the second nanofilm is relatively thin, the visible light reflectance of the second nanofilm tends to decrease. In some embodiments of the present application, the first nanofilm includes a first high refractive index layer and a first low refractive index layer alternately provided outward from the second surface of the laminated glass. The second nanofilm includes a second high refractive index layer and a second low refractive index layer alternately provided outward from the second surface of the laminated glass. The thickness of the second high refractive index layer is smaller than the thickness of the first high refractive index layer. In some embodiments of the present application, the thickness of the second low refractive index layer is smaller than the thickness of the first low refractive index layer. Referring to FIG. 8, FIG. 8 is a schematic diagram showing the structure of a nanofilm according to one embodiment of the present application. The nanofilm includes a first nanofilm 20-1 and a second nanofilm 20-2. The first nanofilm 20-1 includes a first high refractive index layer 21-1 and a first low refractive index layer 22-1. The second nanofilm 20-2 includes a second high refractive index layer 21-2 and a second low refractive index layer 22-2. Here, the thickness of the second high refractive index layer 21-2 is smaller than the thickness of the first high refractive index layer 21-1, and the thickness of the second low refractive index layer 22-2 is smaller than the thickness of the first low refractive index layer 22-1. With the above structural arrangement, the visible light reflectance of the second nanofilm can be effectively reduced, the visible light reflectance of the second nanofilm can be made lower than the visible light reflectance of the first nanofilm, and the color difference between the first nanofilm and the second nanofilm can be made smaller.

[0046] In the present application, when the first high refractive index layer includes a plurality of first high refractive index sub-layers, the thickness of the first high refractive index layer refers to the sum of the thicknesses of the plurality of first high refractive index sub-layers. Similarly, when the first low refractive index layer includes a plurality of first low refractive index sub-layers, the thickness of the first low refractive index layer refers to the sum of the thicknesses of the plurality of first low refractive index sub-layers. In some embodiments of the present application, the first low refractive index layer includes at least two first low refractive index sub-layers, the second low refractive index layer includes at least two second low refractive index sub-layers, and the thickness of the first low refractive index sub-layer in the first low refractive index layer that is farthest from the laminated glass is greater than the thickness of the second low refractive index sub-layer in the second low refractive index layer that is farthest from the laminated glass. Referring to FIG. 9, FIG. 9 is a schematic diagram showing the structure of a nanofilm according to another embodiment of the present application. The nanofilm includes a first nanofilm 20-1 and a second nanofilm 20-2. The first nanofilm 20-1 includes a first high refractive index layer 21-1 and a first low refractive index layer 22-1, and the first low refractive index layer 22-1 includes a first low refractive index sub-layer 22a-1 and a first low refractive index sub-layer 22b-1. The first low refractive index sub-layer 22b-1 is farther from the laminated glass. The second nanofilm 20-2 includes a second high refractive index layer 21-2 and a second low refractive index layer 22-2, and the second low refractive index layer 22-2 includes a second low refractive index sub-layer 22a-2 and a second low refractive index sub-layer 22b-2. The second low refractive index sub-layer 22b-2 is farther from the laminated glass, and the thickness of the second low refractive index sub-layer 22b-2 is smaller than the thickness of the first low refractive index sub-layer 22b-1.

[0047] In some embodiments of the present application, the first high refractive index layer includes at least two first high refractive index sub-layers, the second high refractive index layer includes at least two second high refractive index sub-layers, and the thickness of the first high refractive index sub-layer closest to the laminated glass among the first high refractive index layers is greater than the thickness of the second high refractive index sub-layer closest to the laminated glass among the second high refractive index layers. Referring to FIG. 10, FIG. 10 is a schematic diagram showing the structure of a nanofilm according to another embodiment of the present application. The nanofilm includes a first nanofilm 20-1 and a second nanofilm 20-2. The first nanofilm 20-1 includes a first high refractive index layer 21-1 and a first low refractive index layer 22-1, and the first high refractive index layer 21-1 includes a first high refractive index sub-layer 21a-1 and a first high refractive index sub-layer 21b-1. The first high refractive index sub-layer 21a-1 is closer to the laminated glass. The second nanofilm 20-2 includes a second high refractive index layer 21-2 and a second low refractive index layer 22-2, and the second high refractive index layer 21-2 includes a second high refractive index sub-layer 21a-2 and a second high refractive index sub-layer 21b-2. The second high refractive index sub-layer 21a-2 is closer to the laminated glass, and the thickness of the second high refractive index sub-layer 21a-2 is smaller than the thickness of the first high refractive index sub-layer 21a-1.

[0048] By adjusting the thicknesses of the high refractive index layer and the low refractive index layer in the first nanofilm and the second nanofilm, the present application can make the visible light reflectivity of the second nanofilm lower than that of the first nanofilm, thereby realizing the effect of achieving both projection and low reflectivity in the glass for HUD, and improving the driving safety and comfort.

[0049] In some embodiments of the present application, the second surface of the laminated glass further has a transition region located between the display region and the non-display region, and the visible light reflectance of the transition region is greater than that of the non-display region and less than that of the display region. By providing a transition region between the display region and the non-display region, the colors of the display region and the non-display region can have a certain degree of gradation, whereby the glass for HUD can have good appearance harmony. In the embodiments of the present application, the visible light reflectance of the transition region may change regularly. For example, in the direction from the display region to the non-display region, the visible light reflectance of the transition region tends to decrease. The visible light reflectance of the transition region may change irregularly.

[0050] In some embodiments of the present application, the glass for HUD further includes one or more of an anti-fingerprint film, a heat-insulating film, an electrically heated film, an ultraviolet-cutting film, and an anti-fogging film. In some embodiments of the present application, the anti-fingerprint film is provided on the second surface 10-2 of the laminated glass and covers at least the display area. Preferably, the anti-fingerprint film covers both the display area and the non-display area to prevent the display area from being soiled by fingerprints or the like, thereby realizing a HUD with a higher quality display area. In an embodiment of the present application, the heat-insulating film may be provided on the second surface of the outer glass plate of the laminated glass, on the second surface of the inner glass plate of the laminated glass, or between the second surface of the outer glass plate and the second surface of the inner glass plate of the laminated glass. The heat-insulating film may be one or more of a single-silver heat-insulating film, a double-silver heat-insulating film, a triple-silver heat-insulating film, a quadruple-silver heat-insulating film, a heat-insulating / heat-absorbing PVB, and a heat-insulating film based on a metal material or a non-metal material such as NiCr or TiN. The single-silver heat-insulating film, the double-silver heat-insulating film, the triple-silver heat-insulating film, and the quadruple-silver heat-insulating film respectively refer to transparent nano heat-insulating films having one silver layer, two silver layers, three silver layers, and four silver layers. The transparent nano heat-insulating film includes at least two dielectric layers in addition to the silver layer. The heat-insulating film can improve the riding comfort inside the vehicle. The single-silver heat-insulating film, the double-silver heat-insulating film, the triple-silver heat-insulating film, and the quadruple-silver heat-insulating film can be directly disposed on the second surface of the outer glass plate of the laminated glass or the second surface of the inner glass plate of the laminated glass by magnetron sputtering deposition, or can be disposed on the surface of the intermediate layer. The intermediate layer may be polyethylene terephthalate (PET). Then, an intermediate layer with a single-silver heat-insulating film, a double-silver heat-insulating film, a triple-silver heat-insulating film, and a quadruple-silver heat-insulating film disposed between the second surface of the outer glass plate of the laminated glass and the second surface of the inner glass plate of the laminated glass is disposed.

[0051] In some embodiments of the present application, the electric heating film is provided on the second surface of the outer glass plate of the laminated glass, on the second surface of the inner glass plate of the laminated glass, or on the second surfaces of both the outer glass plate and the inner glass plate. The electric heating film may be any one of a single-silver-based electric heating film, a double-silver-based electric heating film, a triple-silver-based electric heating film, a quadruple-silver-based electric heating film, and a quintuple-silver-based electric heating film. By providing at least two bus bars between the second surface of the outer glass plate and the second surface of the inner glass plate, the current of the power supply can be input into the electric heating film, thereby causing the electric heating film to generate heat to heat the laminated glass, realizing the functions of removing frost, fog, and even ice and snow, further improving the driving safety, and preventing the display area from being interfered by the environment and unable to realize the HUD. Here, the single-silver-based electric heating film, the double-silver-based electric heating film, the triple-silver-based electric heating film, the quadruple-silver-based electric heating film, and the quintuple-silver-based electric heating film refer to transparent nano-conductive films having one silver layer, two silver layers, three silver layers, four silver layers, and five silver layers, respectively. The transparent nano-conductive film includes at least two dielectric layers in addition to the silver layer.

[0052] In some embodiments of the present application, the heat insulation / heat absorption PVB and the ultraviolet cut-off film may be provided between the second surface of the outer glass plate and the second surface of the inner glass plate. The heat insulation / heat absorption PVB and the ultraviolet cut-off film can be obtained by adding an infrared reflection component, an infrared absorption component, and / or an ultraviolet absorption component to the standard PVB.

[0053] In some embodiments of the present application, the anti-fog film is provided on the second surface 10-2 of the laminated glass and covers at least the display area. Preferably, the anti-fog film covers both the display area and the non-display area. The anti-fog film can prevent the realization of the HUD function in the display area from being affected by water mist, etc. The anti-fog film can further reduce the influence of water mist on the signals of the sensors attached to the laminated glass, and ensure the recognition accuracy of sensors such as cameras and lidar.

[0054] In this application, the position and size of the display area and the position and size of the non-display area can be adjusted according to needs. Referring to FIG. 11, FIG. 11 is a schematic diagram showing the partition of the second surface of the laminated glass according to one embodiment of this application. In FIG. 11, the second surface of the laminated glass includes a display area 31 and a non-display area 32, and the display area 31 is located in the middle of the glass for HUD. Referring to FIG. 12, FIG. 12 is a schematic diagram showing the partition of the second surface of the laminated glass according to another embodiment of this application. In FIG. 12, the second surface of the laminated glass includes two display areas 31, and the area other than the display area 31 is the non-display area 32. Since the nano film has a more prominent mirror effect on nearby objects, that is, the reflection of objects closer to the inner surface of the glass for HUD is clearer, the bottom of the glass for HUD is provided as a non-display area. Referring to FIG. 13, FIG. 13 is a schematic diagram showing the partition of the second surface of the laminated glass according to another embodiment of this application. In FIG. 13, the non-display area 32 is provided at the bottom of the second surface. Referring to FIG. 14, FIG. 14 is a schematic diagram showing the partition of the second surface of the laminated glass according to another embodiment of this application. The second surface in FIG. 14 includes a display area 31, a non-display area 32, and a transition area 33 located between the display area 31 and the non-display area 32. Referring to FIG. 15, FIG. 15 is a schematic diagram showing the partition of the second surface of the laminated glass according to another embodiment of this application. The second surface in FIG. 15 includes two display areas 31 and three non-display areas 32, and the display areas are located in the middle area of the second surface.

[0055] In this application, the area of the display area is smaller than the area of the second surface of the inner glass plate, and the area of the display area can be adjusted according to needs. In some embodiments of this application, the area of the display area is 25 mm 2 or more, and specifically, the area of the display area is 50 mm 2 , 100 mm 2 , 200 mm 2 , 500 mm 2 , 1000 mm2 、5000 mm 2 or 10000 mm 2 etc., but not limited thereto. If the area of the display region is less than 25 mm 2 , the projected image is relatively small, the driving information that can be projected is relatively small, and inconvenience in use occurs. In some embodiments of the present application, in order to realize an Augmented Reality Head-up Display (AR-HUD), the area of the display region is 500 mm 2 or more, and the area of the display region may be, for example, 120000 mm 2 .

[0056] The glass for HUD according to the present application can present a clear image in the display region, while having a low visible light reflectance in the non-display region, weakening the mirror effect, reducing the reflection in the vehicle interior, and realizing safe driving.

[0057] The glass for HUD of the present application can be manufactured in various ways. In some embodiments of the present application, the glass for HUD is manufactured by a thin film patterning method (film removal method). The film removal method refers to reducing the thickness of a certain film layer or directly removing a certain film layer by removing a part of the already manufactured film layer. For example, first, a first nanofilm is manufactured on the second surface of the laminated glass, and after the first nanofilm is formed in the display region and the non-display region, film removal is performed on the first nanofilm in the non-display region to meet the requirements in the non-display region, and then a second nanofilm can be manufactured in the non-display region. In some embodiments of the present application, first, a second nanofilm is manufactured on the second surface of the laminated glass, and after the second nanofilm is formed in the display region and the non-display region, film removal is performed on the second nanofilm in the display region to manufacture the first nanofilm and meet the requirements in the display region.

[0058] In the embodiments of the present application, the film removal method includes one or more of a dry etching method (e.g., laser, etc.), a wet etching method (e.g., etching paste, acid etching, etc.), and a masking method (e.g., removable adhesive, cover plate, etc.). In a specific manufacturing process, different film removal processes can be used according to the material of the film. In some embodiments of the present application, the structure of the first nanofilm is ZnSnO x (38 nm) / TiO 2 (52 nm) / SiO 2 (115 nm) (ZnSnO x (38 nm) is on the side closer to the glass). In this case, the glass for HUD is manufactured by the masking method. Specifically, a cover plate is used to cover the non-display area, the first nanofilm is manufactured in the display area, and the cover plate is removed to obtain the glass for HUD. In some embodiments of the present application, the second nanofilm structure of is a film system composed of ZnSnO x (18 nm) / SiO 2 (28 nm) / ZnSnO x (102 nm) / SiO 2 (90 nm). The second nanofilm is manufactured simultaneously in the display area and the non-display area, and then the film layer in the display area is removed using a laser to obtain the display area not covered by the second nanofilm. Then, a cover plate is used to cover the non-display area, the first nanofilm is manufactured in the display area, and the glass for HUD is obtained. The structure of the first nanofilm is ZnSnO x (38 nm) / TiO 2 (52 nm) / SiO 2 (115 nm).

[0059] In some embodiments of the present application, the first nanofilm structure of is ZnSnO x (14.4 nm) / TiO 2 (58.6 nm) / SiO 2 (112.4 nm) (ZnSnO x (14.4 nm) is on the side closer to the glass). The second nanofilm structure of is ZnSnO x(14.4 nm) / SiO 2 (112.4 nm). The glass for HUD can be fabricated as follows. First, deposit a ZnSnO x film and a TiO 2 film on the second surface of the laminated glass. Next, remove the TiO 2 film in the non-display area so that there is no TiO 2 film. Then, deposit an SiO 2 film simultaneously on both the display area and the non-display area to obtain the glass for HUD.

[0060] In some embodiments of the present application, the first nanofilm structure of is ZnSnO x (38 nm) / TiO 2 (52 nm) / SiO 2 (115 nm), and the second nanofilm structure of is ZnSnO x (47 nm) / TiO 2 (52 nm) / SiO 2 (115 nm). The glass for HUD can be fabricated as follows. First, deposit 47 nm of ZnSnO x on the second surface of the laminated glass, and remove 9 nm of the ZnSnO x in the display area using a film removal method such as laser dry etching. Then, fabricate TiO 2 (52 nm) and SiO 2 (115 nm) to obtain the first nanofilm in the display area and the second nanofilm in the non-display area.

[0061] In some embodiments of the present application, the first nanofilm structure of is ZnSnO x (38 nm) / TiO 2 (52 nm) / SiO 2 (115 nm), and the second nanofilm structure of is ZnSnO x (38 nm) / TiO 2 (52 nm) / SiO 2(110 nm). The glass for HUD can be manufactured as follows. First, a first nanofilm is formed on the second surface of the laminated glass, and SiO with a thickness of 5 nm is removed from the non-display area using an etching paste or a laser etching method to obtain a second nanofilm. 2

[0062] In some embodiments of the present application, the glass for HUD is manufactured using a non-uniform coating method. Since the area of the windshield of an automobile is generally larger than 1.2 m, when using a vacuum coating method such as sputtering, a relatively large coating chamber is required. Also, since the gas introduced into the coating chamber is distributed according to a certain ratio, the deposition thickness of the film layer can be adjusted by changing the distribution ratio of the gas, and different film layers can be formed on the surface of the laminated glass. In some embodiments of the present application, the first nanofilm 2 structure of is ZnSnO x (38 nm) / TiO 2 (52 nm) / SiO 2 (115 nm), and the second nanofilm structure of is ZnSnO x (38 nm) / TiO 2 (52 nm) / SiO 2 (105 nm). ZnSnO x (38 nm) is on the side closer to the laminated glass. The glass for HUD can be manufactured as follows. First, ZnSnO x (38 nm) and TiO 2 (52 nm) are formed on the second surface of the laminated glass. When forming the SiO 2 film, gas is normally introduced into the display area to form a SiO x (38 nm) / TiO 2 (52 nm) film with a thickness of 115 nm on the surface. The flow rate of oxygen gas is increased in the non-display area, and at the end of the coating, the thickness of the SiO 2 film in the non-display area is such that the thickness of the SiO 2 film in the non-display area is that of the SiO 2Less than the thickness of the film, SiO in the non-display area 2 The thickness of the film is 105 nm. Referring to FIG. 16, FIG. 16 is a schematic diagram showing the structure of the glass for HUD according to another embodiment of the present application. The second nanofilm 20-2 is located in the middle of the second surface 10-2 of the laminated glass 10, and the first nanofilm 20-1 is located at the edge of the second surface 10-2 of the laminated glass 10. The glass for HUD having this structure can be manufactured by the non-uniform coating method. Since the gas in the coating chamber is distributed at a certain ratio, the thickness of the second nanofilm changes step by step, which helps to improve the appearance consistency of the glass for HUD.

[0063] The present application further provides a HUD system. The HUD system includes a projection unit for generating P-polarized light and the glass for HUD of the present application. The P-polarized light is incident on the display area. Referring to FIG. 17, FIG. 17 is a schematic diagram showing the structure of the HUD system according to one embodiment of the present application. The HUD system includes a projection unit 200 and the glass for HUD 100 according to the present application. The glass for HUD 100 includes a laminated glass 10 and a nanofilm 20. The projection unit 200 is used to project the relevant character and image information during driving, such as speed, engine speed, fuel consumption, tire pressure, dynamic navigation, night vision, live map, etc., onto the glass for HUD. Thereby, these informations can be observed by the observer's eyes 300. Specifically, the projection unit 200 can generate P-polarized light. The P-polarized light A is incident on the nanofilm 20. The nanofilm 20 directly reflects a part of the polarized light to form a reflected light A1. The reflected light A1 can be directly observed by the observer's eyes 300. Thereby, the observer can obtain the projected information. At the same time, the non-display area of the present application has a relatively low visible light reflectivity and a relatively weak mirror effect. Therefore, the situation outside the vehicle can be clearly seen through the non-display area, and the safety and comfort during driving can be ensured.

[0064] In the embodiments of the present application, the incident angle of P-polarized light incident on the nanofilm 20 is 55° to 75°, and the P-polarized light reflectivity of the nanofilm 20 is 10% or more. Thereby, an HUD can be realized, and furthermore, an AR-HUD can be realized. In the embodiments of the present application, the position of the projection unit 200 and the incident angle of P-polarized light can be adjusted according to the position and height of the observer. In the present application, the ratio of P-polarized light generated by the projection unit 200 is 80% or more, more preferably 90% or more, and even more preferably 100%.

[0065] Hereinafter, the technical solutions of the present application will be further described based on a plurality of embodiments. <Example 1>

[0066] The method for manufacturing the glass for HUD includes the following contents.

[0067] Provide a first glass plate, transfer the first glass plate to a coating production line, and deposit a ZnSnO film with a thickness of 38 nm, a TiO film with a thickness of 52 nm, and a SiO film with a thickness of 115 nm in sequence on the surface of the first glass plate to form a first nanofilm. Use a laser to etch the first nanofilm in the non-display area to perform film removal, and leave a ZnSnO film with a thickness of 10 nm in the non-display area to obtain a second nanofilm. x film, a TiO film with a thickness of 52 nm 2 film, a SiO film with a thickness of 115 nm 2 film are sequentially deposited to form a first nanofilm. Using a laser, the first nanofilm in the non-display area is etched to remove the film, and a ZnSnO film with a thickness of 10 nm is left in the non-display area to obtain a second nanofilm. x film to obtain a second nanofilm.

[0068] The structure of the first nanofilm in the display area is ZnSnO x (38 nm) / TiO 2 (52 nm) / SiO 2 (115 nm).

[0069] The structure of the second nanofilm in the non-display area is ZnSnO x (10 nm).

[0070] After forming a nanofilm on the first glass plate, the first glass plate is used as the inner glass plate of the laminated glass. SG (solar green) glass with a thickness of 2.1 mm manufactured by Fuyao Glass Industry Group Co., Ltd. (a company name, hereinafter abbreviated as Fuyao Group) is used as the outer glass plate. According to the high-temperature forming process of automotive glass, the outer glass plate and the inner glass plate are bent and formed. A colorless PVB film with a thickness of 0.76 mm is prepared. This PVB film is temporarily laminated with the bent outer glass plate and inner glass plate. The nanofilm on the first glass plate is separated from the PVB film. After laminating under high pressure in an autoclave, the glass for HUD is obtained. <Example 2>

[0071] The manufacturing method of the glass for HUD includes the following content.

[0072] Provide the first glass plate, transfer the first glass plate to the coating production line, and deposit a ZnSnO film with a thickness of 38 nm, a TiO film with a thickness of 52 nm, and a SiO film with a thickness of 115 nm on the surface of the first glass plate in sequence to form the first nanofilm. x film, a TiO film with a thickness of 52 nm 2 film, a SiO film with a thickness of 115 nm 2 film in sequence to form the first nanofilm.

[0073] Using the etching paste manufactured by Merck (a company name), etch the first nanofilm in the non-display area to remove the first nanofilm in the non-display area. That is, the non-display area is the exposed glass surface.

[0074] The structure of the first nanofilm in the display area is ZnSnO(38 nm) / TiO(52 nm) / SiO(115 nm). x (38 nm) / TiO 2 (52 nm) / SiO 2 (115 nm).

[0075] Non-display area: The exposed glass surface.

[0076] Use the first glass plate as the inner glass plate of the laminated glass, use the SG glass with a thickness of 2.1 mm manufactured by the Fuyao Group as the outer glass plate, perform bending forming on the outer glass plate and the inner glass plate according to the high-temperature forming process of automotive glass, prepare a colorless PVB film with a thickness of 0.76 mm, temporarily laminate this PVB film with the bent outer glass plate and inner glass plate, the nanofilm of the first glass plate is separated from the PVB film, and after laminating under high pressure in an autoclave, obtain the glass for HUD. <Example 3>

[0077] The manufacturing method of the glass for HUD includes the following content.

[0078] Provide the first glass plate, transfer the first glass plate to the coating production line, and deposit a ZnSnO film with a thickness of 14.4 nm on the surface of the first glass plate first, cover the non-display area with a cover plate, and deposit a TiO film with a thickness of 58.6 nm on the display area. x Cover the non-display area with a cover plate, deposit a TiO film with a thickness of 58.6 nm on the display area, remove the cover plate, and deposit a SiO film with a thickness of 112.4 nm on the display area and the non-display area to form the first nanofilm and the second nanofilm. 2 Remove the cover plate and deposit a SiO film with a thickness of 112.4 nm on the display area and the non-display area to form the first nanofilm and the second nanofilm. 2 Deposit a SiO film with a thickness of 112.4 nm on the display area and the non-display area to form the first nanofilm and the second nanofilm.

[0079] The structure of the first nanofilm in the display area is ZnSnO(14.4 nm) / TiO(58.6 nm) / SiO(112.4 nm). x (14.4nm) / TiO 2 (58.6nm) / SiO 2 (112.4nm).

[0080] The structure of the second nanofilm in the non-display area is ZnSnO(14.4 nm) / SiO(112.4 nm). x (14.4nm) / SiO 2 (112.4nm).

[0081] Use the first glass plate as the inner glass plate of the laminated glass, use the SG glass with a thickness of 2.1 mm manufactured by the Fuyao Group as the outer glass plate, perform bending forming on the outer glass plate and the inner glass plate according to the high-temperature forming process of automotive glass, prepare a colorless PVB film with a thickness of 0.76 mm, temporarily laminate this PVB film with the bent outer glass plate and inner glass plate, and the nanofilm of the first glass plate is separated from the PVB film. After laminating under high pressure in an autoclave, obtain the glass for HUD. <Example 4>

[0082] The manufacturing method of the glass for HUD includes the following content.

[0083] Provide the first glass plate, transfer the first glass plate to the coating production line, and deposit a ZnSnO film with a thickness of 25 nm, a SiO film with a thickness of 10 nm, a TiO film with a thickness of 70 nm, and a SiO film with a thickness of 110 nm on the surface of the first glass plate in sequence. Use the non-uniform coating method to prepare the TiO film, and adjust the distribution ratio of oxygen gas in the coating chamber by controlling the flow rate of oxygen gas, and deposit TiO films with different thicknesses on the surface of the ZnSnO / SiO film. The thickness of the TiO film in the display area is 60 nm, the thickness of the TiO film in the non-display area is 70 nm, and the thickness of the TiO film in the transition area is greater than 60 nm and less than 70 nm. x film, a SiO film with a thickness of 10 nm 2 film, a TiO film with a thickness of 70 nm 2 film, and a SiO film with a thickness of 110 nm 2 film are deposited in sequence, and the TiO film is prepared using the non-uniform coating method. By controlling the flow rate of oxygen gas, the distribution ratio of oxygen gas in the coating chamber is adjusted, and TiO films with different thicknesses are deposited on the surface of the ZnSnO / SiO film. 2 film, and adjust the distribution ratio of oxygen gas in the coating chamber by controlling the flow rate of oxygen gas. x / SiO 2 film, and deposit TiO films with different thicknesses on the surface of the ZnSnO / SiO film. 2 The thickness of the TiO film in the display area is 60 nm, and the thickness of the TiO film in the non-display area is 70 nm. 2 The thickness of the TiO film in the non-display area is 70 nm, and the thickness of the TiO film in the transition area is greater than 60 nm and less than 70 nm. 2 The thickness of the TiO film in the non-display area is 70 nm, and the thickness of the TiO film in the transition area is greater than 60 nm and less than 70 nm. 2 The thickness of the TiO film in the transition area is greater than 60 nm and less than 70 nm.

[0084] The structure of the first nanofilm in the display area is ZnSnO(25 nm) / SiO(10 nm) / TiO(60 nm) / SiO(110 nm). x (25 nm) / SiO 2 (10 nm) / TiO 2 (60 nm) / SiO 2 (110 nm).

[0085] The structure of the nanofilm in the transition region is ZnSnO x (25nm) / SiO 2 (10 nm) / TiO 2 (60-70nm) / SiO 2 (110 nm).

[0086] The structure of the second nanofilm in the non-display area is ZnSnO x (25nm) / SiO 2 (10 nm) / TiO 2 (70nm) / SiO 2 (110 nm).

[0087] The first glass sheet is used as the inner glass sheet of the laminated glass, and the 2.1 mm thick SG glass manufactured by Fuyao Group is used as the outer glass sheet. According to the high-temperature forming process of automotive glass, the outer glass sheet and the inner glass sheet are bent to prepare a colorless PVB film with a thickness of 0.76 mm. The PVB film is pre-laminated with the bent outer glass sheet and the inner glass sheet. The nano film of the first glass sheet is separated from the PVB film. After lamination under high pressure in an autoclave, the glass for HUD is obtained. <Example 5>

[0088] The method for manufacturing the glass for the HUD includes the following:

[0089] A first glass plate is provided, and the first glass plate is transferred to a coating production line, and a TiO film having a thickness of 10 nm is coated on the surface of the first glass plate. 2 film, 45 nm thick SiO 2 film, and 20 nm thick TiO 2 The films are deposited in order, a cover plate is used to cover the non-display area, and a 150 nm thick SiO 2 Film, 46.5 nm thick TiO 2 film, and 110 nm thick SiO 2 The films are deposited in sequence and the cover plate is removed to obtain the first nanofilm and the second nanofilm.

[0090] The structure of the first nanofilm in the display area is TiO 2 (10 nm) / SiO 2 (45 nm) / TiO 2 (20nm) / SiO 2 (150 nm) / TiO 2 (46.5nm) / SiO 2 (110 nm).

[0091] The structure of the second nanofilm in the non-display area is TiO 2 (10 nm) / SiO 2 (45 nm) / TiO 2 (20nm).

[0092] The first glass sheet is used as the inner glass sheet of the laminated glass, and the 2.1mm thick green glass produced by Fuyao Group is used as the outer glass sheet. According to the high-temperature forming process of automotive glass, the outer glass sheet and the inner glass sheet are bent to prepare a colorless PVB film with a thickness of 0.76mm. The PVB film is pre-laminated with the bent outer glass sheet and the inner glass sheet. The nano film of the first glass sheet is separated from the PVB film. After lamination under high pressure in an autoclave, the glass for HUD is obtained. <Example 6>

[0093] The method for manufacturing the glass for the HUD includes the following:

[0094] Provide a first glass plate, transfer the first glass plate to a coating production line, cover the non-display area with a peelable adhesive, and coat the display area with a 30 nm thick ZnSnO x Film, 30 nm thick TiO 2 The film is then deposited on a porous SiO 2 The sol is used to form a porous SiO 2 film on the display area by a dip-coating method. 2 A layer was prepared (porous SiO 2 The surface of the unpartitioned side of the first glass plate is covered by a masking method so that the layer is formed only on the display area), and the peelable adhesive is removed.

[0095] The structure of the first nanofilm in the display area is ZnSnO x (30 nm) / TiO 2 (30 nm) / porous SiO 2 (110 nm).

[0096] The non-display area is: the exposed glass surface.

[0097] A second glass plate is provided. The second glass plate is colorless glass with a thickness of 2.1 mm. A double-silver heat-insulating film is deposited on the second glass plate. The structure of the double-silver heat-insulating film is ZnSnO x (23 nm) / AZO(10 nm) / Ag(9.7 nm) / AZO(15 nm) / ZnSnO x (67 nm) / AZO(10 nm) / Ag(9.0 nm) / AZO(10 nm) / ZnSnO x (28.5 nm).

[0098] The first glass plate is used as the inner glass plate of the laminated glass, and the second glass plate is used as the outer glass plate. According to the high-temperature forming process of automotive glass, the outer glass plate and the inner glass plate are bent and formed. A colorless PVB film with a thickness of 0.76 mm is prepared. This PVB film is temporarily laminated with the bent outer glass plate and inner glass plate. The nanofilm of the first glass plate is away from the PVB film, and the double-silver heat-insulating film of the second glass plate is close to the PVB film. After laminating under high pressure in an autoclave, the glass for HUD is obtained. The refractive index of the porous SiO 2 layer after high-temperature forming is 1.383. <Effect Example>

[0099] To verify the performance of the glass for HUD manufactured according to this application, this application also provides an effect example.

[0100] 1) Assemble the HUD glasses and the projection unit in Examples 1 to 6 to form a HUD system. The projection unit is a thin-film transistor-liquid crystal display (TFT-LCD) projector that utilizes an LED backlight and can generate P-polarized light. Adjust the position of the projection unit, the angle of the emitted light, and the incident direction so that the displayed image observable by the observer is the clearest. In Examples 1 to 6, maintain the incidence of P-polarized light, make the P-polarized light incident at an incident angle of 60°, measure the P-polarized light reflectance of the HUD glass, and measure the visible light reflectance of the HUD glass. Use a colorimeter to test the chromaticity [Lab (CIE)] of the display area and the non-display area of the HUD glass in Examples 1 to 6, where a represents the chromaticity index of red-green and b represents the chromaticity index of yellow-blue. The property parameters of the HUD glass in Examples 1 to 6 are shown in Table 1.

[0101] Table showing the property parameters of the HUD glass in Examples 1 to 6

Table 1

[0102] As can be seen from Table 1, by the manufacturing method of the HUD glass according to the present application, a display area having a relatively high P-polarized light reflectance and a non-display area having a relatively low visible light reflectance can be obtained on the surface of the laminated glass. Thereby, while ensuring a clear image in the display area, the mirror effect in the non-display area can be weakened, visual interference can be reduced, and the driving safety and comfort can be improved. At the same time, the HUD glass according to the present application can also have functions such as heat insulation. For example, as in Example 6, by adding a double-silver film to the laminated glass, not only can the heat insulation performance of the HUD glass be improved, but also the display quality of the HUD image in the display area is not affected, and it can be ensured that the HUD glass has good HUD functions.

[0103] The above embodiments of the present application describe the structure and composition of the glass for HUD. For example, the specific deposition process and parameters of the film layer, and the specific manufacturing process and parameters of the glass for HUD are not described. As can be understood, all of the above contents are well-known to those skilled in the art, so the parts not described do not affect the protection scope of the present application. In addition, the content of the specification of the present application is a preferred embodiment of the present application, but should not be understood as limiting the scope of the present application. Those skilled in the art can make some improvements and refinements on the premise of not departing from the principle of the present application, and these improvements and refinements are also regarded as within the protection scope of the present application.

Claims

Claim 1 A glass for a head-up display (HUD), wherein the glass for the HUD includes a laminated glass having a first surface and a second surface facing away from each other, and the second surface has a display area and a non-display area, in the display area, a first nanofilm is provided, and the first nanofilm includes at least one first high refractive index layer and at least one first low refractive index layer alternately laminated outward from the second surface, the refractive index of the first high refractive index layer is 1.9 to 2.7, and the refractive index of the first low refractive index layer is 1.3 to 1.8, the reflectivity of the display area for P-polarized light incident at 55° to 75° is 10% or more, and the reflectivity of the non-display area for visible light incident at 0° to 10° is smaller than the reflectivity of the display area for visible light incident at 0° to 10°, in the non-display area, a second nanofilm is provided, and the second nanofilm includes at least one second high refractive index layer and at least one second low refractive index layer alternately provided outward from the second surface, the refractive index of the second high refractive index layer is 1.9 to 2.7, and the refractive index of the second low refractive index layer is 1.3 to 1.8, and the second nanofilm is different from the first nanofilm, the second nanofilm and the first nanofilm have the same material of each layer and the same arrangement of each layer, and among the thicknesses of each layer, at least one layer has a different thickness, characterized in that it is a glass for HUD. Claim 2 The difference between the reflectivity of the display area for visible light incident at 0° to 10° and the reflectivity of the non-display area for visible light incident at 0° to 10° is 2% or more, characterized in that it is the glass for HUD according to claim 1. Claim 3 The reflectivity of the display area for visible light incident at 0° to 10° is 10% to 30%, and the reflectivity of the non-display area for visible light incident at 0° to 10° is 1% to 15%, characterized in that it is the glass for HUD according to claim 1. Claim 4 The reflectivity of the non-display area for P-polarized light incident at 55° to 75° is smaller than the reflectivity of the display area for P-polarized light incident at 55° to 75°, characterized in that it is the glass for HUD according to claim 1. Claim 5 The second surface further has a transition region located between the display region and the non-display region, and the reflectance of the transition region with respect to visible light incident at 0° to 10° is greater than the reflectance of the non-display region with respect to visible light incident at 0° to 10°, and is smaller than the reflectance of the display region with respect to visible light incident at 0° to 10°. The HUD glass according to claim 1, characterized in that.

6. With respect to visible light incident at 0° to 10°, based on the Lab color space, both the a value of the color of the display region and the a value of the color of the non-display region are (-8) to 0, and both the b value of the color of the display region and the b value of the color of the non-display region are (-12) to 0. The HUD glass according to claim 1, characterized in that.

7. With respect to visible light incident at 0° to 10°, the absolute value of the difference between the a value of the color of the display region and the a value of the color of the non-display region is 2 or less, and the absolute value of the difference between the b value of the color of the display region and the b value of the color of the non-display region is 2 or less. The HUD glass according to claim 1, characterized in that.

8. The HUD glass further includes one or more of an anti-fingerprint film, a heat-insulating film, an electric heating film, an ultraviolet-ray cut film, and an anti-fog film. The HUD glass according to claim 1, characterized in that.

9. The thickness of the second nanofilm is smaller than the thickness of the first nanofilm. The HUD glass according to claim 1, characterized in that.

10. The thickness of the second high refractive index layer is smaller than the thickness of the first high refractive index layer, and / or The thickness of the second low refractive index layer is smaller than the thickness of the first low refractive index layer. The HUD glass according to claim 1, characterized in that.

11. The first low refractive index layer includes at least two first low refractive index sub-layers, the second low refractive index layer includes at least two second low refractive index sub-layers, and the thickness of the first low refractive index sub-layer farthest from the laminated glass in the first low refractive index layer is larger than the thickness of the second low refractive index sub-layer farthest from the laminated glass in the second low refractive index layer, or The first high refractive index layer includes at least two first high refractive index sub-layers, the second high refractive index layer includes at least two second high refractive index sub-layers, and the thickness of the first high refractive index sub-layer closest to the laminated glass in the first high refractive index layer is greater than the thickness of the second high refractive index sub-layer closest to the laminated glass in the second high refractive index layer. The glass for HUD according to claim 1, characterized in that.

12. A head-up display (HUD) system, The HUD system includes a projection unit for generating P-polarized light and the glass for HUD according to any one of claims 1 to 11, and the P-polarized light is incident on the display area. The HUD system, characterized in that.

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