Vehicle window glass

Abstract

The invention provides vehicle window glass which comprises an outer glass plate, an inner glass plate, a bonding layer, a low-radiation layer and a light-emitting element, and light emitted by the light-emitting element can penetrate through the low-radiation layer to enter the interior of a vehicle. The inner glass plate provided with the low-radiation layer has a first transmittance TL1 for light emitted by the light-emitting element, and TL1 is larger than or equal to 80%. The emissivity e of the window glass measured from the fourth surface side is less than 0.3. The vehicle window glass provided by the invention can be well matched with a light-emitting element for use, so that the overall brightness of a lighting / atmosphere lamp can be kept; when the light emitted by the light-emitting element entering the vehicle penetrates through the inner glass plate and the low-radiation layer, the defects that the color richness of the atmosphere lamp is reduced, the brightness of the atmosphere lamp is reduced, the color of the atmosphere lamp is cast or the overall brightness of the illumination / atmosphere lamp is not uniform are overcome. The vehicle window glass provided by the invention also has excellent effects of heat insulation in summer and heat preservation in winter.

Description

Technical Field

[0001] The present application relates to the technical field of glass manufacturing, and specifically provides a vehicle window glass. Background Art

[0002] As vehicles become more intelligent, the demand for intelligent light control is increasing day by day, so as to provide car drivers and passengers with more scene and atmosphere experiences. Luminous glass with ambient light effects is usually used to enhance or create the atmosphere inside the car, and has been widely valued by manufacturers and favored by consumers.

[0003] As the size of the sunroof glass gets bigger and bigger, especially the panoramic sunroof glass or panoramic skylight glass on electric vehicles, the interior space of the vehicle becomes very hot in the summer due to the high temperature environment and strong direct sunlight, and becomes very cold in the winter due to the heat loss in the vehicle caused by the low external temperature. More and more vehicles achieve the effect of "warm in winter and cool in summer" by adding a film layer with low radiation performance on the surface of the sunroof glass close to the interior space. In summer, the low radiation film layer can reduce the long-wave heat radiation emitted by the heated sunroof glass to the interior of the vehicle, and can isolate heat from entering the interior of the vehicle; in winter, the low radiation film layer can reduce the heat inside the vehicle from radiating to the external environment, avoiding heat loss in the vehicle.

[0004] At present, some high-end cars are often equipped with multiple functions. For example, a vehicle with both ambient light effect and low radiation effect is provided. Since the light that produces the ambient light effect is transmitted from the inside of the vehicle to the inside of the vehicle, it must pass through the low radiation film layer to reach the inside of the vehicle and be observed by the driver and passengers inside the vehicle.

[0005] When the low-emissivity film layer in the prior art is used in conjunction with luminous glass with an ambient light effect, it has the disadvantages of reducing the richness of the ambient light color, lowering the brightness of the ambient light, causing the color of the ambient light to be biased, or causing the overall brightness of the lighting / ambience light to be uneven. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the purpose of the present application is to provide a vehicle window glass, the low-emissivity film layer of the vehicle window glass has a low influence on the reflectivity and absorptivity of the light producing the ambient light effect, and the ratio of the transmitted colors of red, green and blue is uniform, thereby providing a vehicle with both ambient light effect and low-emissivity effect, the color of the ambient light effect is rich and without color cast, the brightness is high and the overall uniformity is provided.

[0007] To achieve the above object, the present application provides a vehicle window glass, the vehicle window glass comprising an outer glass plate, an inner glass plate and an adhesive layer, the outer glass plate comprising a first surface and a second surface, the inner glass plate comprising a third surface and a fourth surface, the adhesive layer being located between the second surface and the third surface;

[0008] The vehicle window glass further comprises a low-emissivity layer and a light-emitting element, wherein the low-emissivity layer is arranged on the fourth surface, the light-emitting element is installed on the vehicle window glass, and the light emitted by the light-emitting element can pass through the fourth surface and the low-emissivity layer;

[0009] The inner glass plate provided with the low-emissivity layer has a first transmittance TL1 for the light emitted by the light-emitting element, and the TL1 is ≥ 80%;

[0010] The emissivity of the vehicle window glass measured from the fourth surface side is e<0.3.

[0011] In the above-mentioned window glass, the low-emissivity layer is arranged on the fourth surface of the inner glass plate, that is, on the inner surface of the window glass, to reduce the emissivity of the window glass. Preferably, the emissivity of the window glass measured from the fourth surface side is e≤0.25, or e≤0.2.

[0012] In the above-mentioned vehicle window glass, preferably, the light emitting element is provided on the first surface, or on the second surface, or on the third surface, or between the second surface and the third surface, or on the end surface of the outer glass plate.

[0013] In the above vehicle window glass, preferably, the light emitting element is arranged on the fourth surface, or on the end surface of the inner glass plate; the vehicle window glass further comprises at least one light extraction element, and the light emitted by the light emitting element passes through the fourth surface and the low-emissivity layer and enters the interior of the vehicle after being transmitted by the light extraction element;

[0014] The light extraction element is disposed on the second surface, or on the third surface, or between the second surface and the third surface.

[0015] In the above vehicle window glass, preferably, the TL1 ≥ 85%, or the TL1 ≥ 90%, or the TL1 ≥ 92%.

[0016] In the above-mentioned vehicle window glass, preferably, the light emitted by the light emitting element has a transmission color RGB value after passing through the fourth surface and the low-emissivity layer, and the RGB value satisfies: R:G≥1 and / or R:B≥1.

[0017] In the above-mentioned vehicle window glass, preferably, 1:1.01≤R:G≤1:0.99 and 1:1.01≤R:B≤1:0.99.

[0018] In the above-mentioned vehicle window glass, preferably, 1:1.005≤R:G≤1:0.995, and / or 1:1.005≤R:B≤1:0.995.

[0019] In the above-mentioned vehicle window glass, preferably, the low-emissivity layer includes at least one transparent conductive oxide (TCO) layer, the total physical thickness of the transparent conductive oxide layer is 50nm-300nm, and the material of the transparent conductive oxide layer is selected from one or a combination of two or more of doped zinc oxide, indium tin oxide (ITO), and fluorine-doped tin oxide (FTO), and the doped zinc oxide is zinc oxide doped with one or a combination of two or more of aluminum, tungsten, hafnium, gallium, yttrium, niobium, and neodymium.

[0020] In the above-mentioned vehicle window glass, preferably, the low-emissivity layer also includes at least two first dielectric layers, each of the transparent conductive oxide layers is located between two adjacent first dielectric layers, and the material of the first dielectric layer is selected from one or a combination of two or more of oxides, nitrides and oxynitrides of Zn, Ti, Si, Al, Sn, Se, Zr, Ni, In, Cr, W, Ca, Y, Nb, Cu and Sm.

[0021] In the above-mentioned vehicle window glass, preferably, the outer glass plate is transparent glass, extra-transparent glass or tinted glass; wherein:

[0022] The total iron content of the transparent glass in terms of Fe2O3 is less than or equal to 0.1wt%, and the visible light transmittance of the transparent glass is greater than or equal to 85%;

[0023] The total iron content of the ultra-clear glass in terms of Fe2O3 is less than or equal to 0.015wt%, and the visible light transmittance of the ultra-clear glass is greater than or equal to 90%;

[0024] The total iron content of the tinted glass calculated as Fe2O3 is 0.9wt% to 2.2wt%, the visible light transmittance of the tinted glass is less than 85%, and the tinted glass is green glass, gray glass, blue glass or brown glass.

[0025] In the above-mentioned vehicle window glass, preferably, the outer glass plate is single-layer glass, hollow glass, vacuum glass or laminated glass.

[0026] In the above-mentioned vehicle window glass, preferably, the visible light transmittance TL2 of the inner glass plate and the visible light transmittance TL3 of the inner glass plate provided with the low-emissivity layer satisfy: TL3 / TL2≥0.95, or TL3 / TL2≥1.

[0027] In the above-mentioned vehicle window glass, preferably, the visible light transmittance TL2 of the inner glass plate is ≥85%, or TL2 ≥90%; the visible light transmittance TL3 of the inner glass plate with a low-emissivity layer is ≥81%, or TL3 ≥85%, or TL3 ≥90%.

[0028] In the above-mentioned vehicle window glass, preferably, the haze of the inner glass plate provided with the low-emissivity layer is less than or equal to 1%;

[0029] Alternatively, the haze of the inner glass sheet provided with the low-emissivity layer is less than or equal to 0.5%;

[0030] Alternatively, the haze of the inner glass sheet provided with the low-emissivity layer is less than or equal to 0.3%.

[0031] In the above-mentioned vehicle window glass, preferably, the inner glass plate is transparent glass or extra-transparent glass;

[0032] Wherein, the total iron content of the transparent glass in terms of Fe2O3 is less than or equal to 0.1wt%, and the visible light transmittance of the transparent glass is greater than or equal to 85%;

[0033] The total iron content of the ultra-transparent glass in terms of Fe2O3 is less than or equal to 0.015wt%, and the visible light transmittance of the ultra-transparent glass is greater than or equal to 90%.

[0034] In the above-mentioned vehicle window glass, preferably, the bonding layer is a transparent thermoplastic polymer film or a colored thermoplastic polymer film, the thickness of the bonding layer is 0.38mm-2.28mm, the material of the thermoplastic polymer film is selected from one or a combination of more than two of polyvinyl butyral, polyurethane, ethylene-vinyl acetate copolymer and ionic polymer; the visible light transmittance of the transparent thermoplastic polymer is greater than or equal to 80%; the visible light transmittance of the colored thermoplastic polymer film is less than or equal to 50%, or less than or equal to 20%, or less than or equal to 10%, or less than or equal to 5%.

[0035] In the above-mentioned vehicle window glass, preferably, the light-emitting element is selected from at least one of LED, OLED, MircoLED, MiniLED, and EL elements.

[0036] In the above-mentioned vehicle window glass, preferably, the light extraction element is selected from at least one of a carved structure inside the inner glass plate, a carved structure on the third surface of the inner glass plate, a printed structure on the third surface of the inner glass plate, a film layer on the third surface of the inner glass plate, and a thin film located between the outer glass plate and the inner glass plate.

[0037] In the above-mentioned vehicle window glass, preferably, an infrared reflection layer is provided between the outer glass plate and the bonding layer; and the total solar energy transmittance of the vehicle window glass is less than or equal to 55%, or less than or equal to 30%, or less than or equal to 20%, or less than or equal to 15%;

[0038] The infrared reflection layer comprises at least one metal layer and at least two second dielectric layers, the metal layer is located between the two second dielectric layers, the material of the metal layer is selected from one of silver, gold, copper, aluminum, platinum and alloys of two or more of these metals, and the material of the second dielectric layer is selected from one of oxides, nitrides and oxynitrides containing one or a combination of two or more of Zn, Ti, Si, Al, Sn, Se, Zr, Ni, In, Cr, W, Ca, Y, Nb, Cu, Sm, La, Mg, Ce, Mo, Sb and Bi.

[0039] In the above-mentioned vehicle window glass, preferably, the vehicle window glass also includes a dimming element, the bonding layer includes a first bonding layer and a second bonding layer, the dimming element is arranged between the first bonding layer and the second bonding layer, and the dimming element is selected from at least one of a polymer dispersed liquid crystal film, a suspended particle film, an electrochromic film, and a dye liquid crystal film.

[0040] In the above-mentioned vehicle window glass, preferably, the a value of the reflected color of the inner surface of the vehicle window glass satisfies -5≤a≤2, and the b value satisfies -11≤b≤0.

[0041] The vehicle window glass provided by the present application uses an inner glass plate and a low-emissivity layer with a relatively high visible light transmittance, which can be used well with the light-emitting element, and is conducive to maintaining the overall brightness of the lighting / atmosphere light. Moreover, by controlling the RGB ratio of the transmission color of the inner glass plate and the low-emissivity layer to be relatively close, it is conducive to making the inner glass plate with a low-emissivity layer close to or almost the same as the effect of using transparent glass, ensuring that the light emitted by the light-emitting element entering the vehicle will not reduce the richness of the color of the atmosphere light, reduce the brightness of the atmosphere light, cause the color of the atmosphere light to be biased, or make the overall brightness of the lighting / atmosphere light uneven when passing through the inner glass plate and the low-emissivity layer.

[0042] The vehicle window glass provided in the present application has an emissivity of e<0.3 measured from the fourth surface side, that is, the emissivity of the vehicle window glass on the inside of the vehicle is e<0.3. In summer, it can effectively block the heat outside the vehicle from being transferred to the inside of the vehicle, and in winter, it can block the heat inside the vehicle from being lost to the outside, thereby achieving the excellent effect of heat insulation in summer and heat preservation in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A partial cross-sectional schematic diagram of a first embodiment of the vehicle window glass provided in the present application.

[0044] Figure 2 A partial cross-sectional schematic diagram of a second embodiment of the vehicle window glass provided in the present application.

[0045] Figure 3 It is a partial cross-sectional schematic diagram of a third embodiment of the vehicle window glass provided in the present application.

[0046] Figure 4 It is a partial cross-sectional schematic diagram of a fourth embodiment of the vehicle window glass provided in the present application.

[0047] Figure 5 It is a partial cross-sectional schematic diagram of a fifth embodiment of the vehicle window glass provided in the present application.

[0048] Figure 6 It is a partial cross-sectional schematic diagram of a sixth embodiment of the vehicle window glass provided in the present application. DETAILED DESCRIPTION

[0049] In order to have a clearer understanding of the technical features, objectives and beneficial effects of the present application, the technical solution of the present application is now described in detail below, but it should not be construed as a limitation on the applicable scope of the present application.

[0050] like Figures 1 to 6 As shown, a vehicle window glass provided by the present application is installed on a vehicle, and the vehicle window glass comprises an outer glass plate 10, an inner glass plate 30 and an adhesive layer 20, wherein the outer glass plate 10 comprises a first surface 11 and a second surface 12, the inner glass plate 30 comprises a third surface 31 and a fourth surface 32, and the adhesive layer 20 is located between the second surface 12 and the third surface 31. When the vehicle window glass is installed on the vehicle, the first surface 11 is away from the adhesive layer 20 and in contact with the vehicle exterior environment, the second surface 12 is close to the adhesive layer 20; the third surface 31 is close to the adhesive layer 20, and the fourth surface 32 is away from the adhesive layer 20 and close to the vehicle interior environment; the adhesive layer 20 connects the second surface 12 and the third surface 31.

[0051] The vehicle window glass also includes a low-emissivity layer 40 and a light-emitting element 50, wherein the low-emissivity layer 40 is disposed on the fourth surface 32, and the light-emitting element 50 is installed on the vehicle window glass. The light emitted by the light-emitting element 50 can pass through the fourth surface 32 and the low-emissivity layer 40 and enter the interior of the vehicle; the light emitted by the light-emitting element 50 can bring lighting effects or ambient light effects to the interior of the vehicle.

[0052] Among them, the inner glass plate 30 provided with the low-emissivity layer 40 has a first transmittance TL1 for the light emitted by the light emitting element 50, and the TL1 is ≥80%; the TL1 can be specifically exemplified as 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, etc. The present application adopts the inner glass plate and the low-emissivity layer with TL1 ≥ 80%, which can be well used with the light emitting element 50, which is conducive to maintaining the overall brightness of the lighting / ambience lamp. Moreover, by controlling the RGB ratio of the transmission color of the inner glass plate and the low-emissivity layer to be relatively close, it is conducive to making the effect of the inner glass plate with the low-emissivity layer close to or almost the same as that of the transparent glass, ensuring that the light emitted by the light emitting element 50 entering the vehicle will not have the disadvantages of reducing the richness of the color of the atmosphere lamp, reducing the brightness of the atmosphere lamp, causing the color of the atmosphere lamp to be biased, or making the overall brightness of the lighting / ambience lamp uneven when the light is transmitted through the inner glass plate 30 and the low-emissivity layer 40. The light emitted by the light emitting element 50 is visible light, that is, the wavelength of the light emitted by the light emitting element 50 is in the range of 380nm to 780nm. Preferably, the TL1 is ≥85%, or the TL1 is ≥90%, or the TL1 is ≥92%.

[0053] Among them, the emissivity e of the vehicle window glass measured from the side of the fourth surface 32 is less than 0.3, so that the vehicle window glass has a low emissivity. The emissivity of the vehicle window glass without the low emissivity layer 40 is about 0.9. The vehicle window glass with low emissivity can achieve the effect of heat insulation in summer and heat preservation in winter. The emissivity e of the vehicle window glass can be specifically exemplified as 0.29, or 0.28, or 0.27, or 0.26, or 0.25, or 0.20, or 0.18, or 0.15, etc.; preferably, the emissivity e of the laminated glass 1 is e≤0.25, or e≤0.2. The vehicle window glass provided in the present application has a low emissivity e, which can better block the heat exchange between the inside and outside of the vehicle, and achieve the effect of heat insulation in summer and heat preservation in winter on the basis of omitting the setting of the sunshade in the vehicle.

[0054] exist Figure 1In the embodiment, the light emitting element 50 is disposed on the third surface 31 , and the light emitted by the light emitting element 50 directly passes through the inner glass plate 30 , the fourth surface 32 and the low-emissivity layer 40 into the interior of the vehicle. In some other embodiments, it can be understood that the light-emitting element 50 can be arranged on the first surface 11, and the light emitted by the light-emitting element 50 directly passes through the outer glass plate 10, the bonding layer 20, the inner glass plate 30, the fourth surface 32 and the low-emissivity layer 40 to enter the interior of the vehicle; or, the light-emitting element 50 can also be arranged on the second surface 12, and the light emitted by the light-emitting element 50 directly passes through the bonding layer 20, the inner glass plate 30, the fourth surface 32 and the low-emissivity layer 40 to enter the interior of the vehicle; or, the light-emitting element 50 can also be arranged between the second surface 12 and the third surface 31, for example, in the bonding layer 20, and the light emitted by the light-emitting element 50 directly passes through part of the bonding layer 20, the inner glass plate 30, the fourth surface 32 and the low-emissivity layer 40 to enter the interior of the vehicle; or, the light-emitting element 50 can also be arranged on the end face 13 of the outer glass plate 10, and the light emitted by the light-emitting element 50 directly passes through part of the outer glass plate 10, the bonding layer 20, the inner glass plate 30, the fourth surface 32 and the low-emissivity layer 40 to enter the interior of the vehicle.

[0055] exist Figure 2 and Figure 3 In the embodiment, the light emitting element 50 is arranged on the fourth surface 32, and the vehicle window glass further includes at least one light extraction element 60. The light emitted by the light emitting element 50 passes through the fourth surface 32 and the low-emissivity layer 40 after being transmitted by the light extraction element 60 and enters the interior of the vehicle; the light extraction element 60 is arranged on the second surface 12, or on the third surface 31, or between the second surface 12 and the third surface 31.

[0056] like Figure 2 As shown, the vehicle window glass also includes a light-guiding element 70, and the light-emitting element 50 and the light-guiding element 70 are arranged on the fourth surface 32 through a fixing device 90. The low-emissivity layer 40 is not arranged in the area where the light-emitting element 50 and the light-guiding element 70 cover the fourth surface 32. The light emitted by the light-emitting element 50 is coupled into the inner glass plate 30 through the light-guiding element 70, and the light emitted by the light-emitting element 50 transmitted in the inner glass plate 30 is coupled out from the fourth surface 32 after being transmitted by the light extraction element 60, and passes through the low-emissivity layer 40 into the interior of the vehicle, thereby achieving a lighting effect or an ambient light effect.

[0057] and Figure 2 The difference is, Figure 3The area where the light-emitting element 50 and the light-guiding element 70 cover the fourth surface 32 is provided with the low-emissivity layer 40. The light emitted by the light-emitting element 50 passes through the low-emissivity layer 40 through the light-guiding element 70 and is then coupled into the inner glass plate 30. The light emitted by the light-emitting element 50 transmitted in the inner glass plate 30 is coupled out from the fourth surface 32 after being transmitted by the light extraction element 60, and passes through the low-emissivity layer 40 to enter the interior of the vehicle, thereby achieving a lighting effect or an ambient light effect.

[0058] exist Figure 4 , Figure 5 and Figure 6 In the embodiment, the light emitting element 50 is arranged on the end surface 33 of the inner glass plate 30; the vehicle window glass also includes at least one light extraction element 60, and the light emitted by the light emitting element 50 passes through the fourth surface 32 and the low-emissivity layer 40 after being transmitted by the light extraction element 60 to enter the interior of the vehicle; the light extraction element 60 is arranged on the second surface 12, or on the third surface 31, or between the second surface 12 and the third surface 31.

[0059] like Figure 4 As shown, the size of the outer glass plate 10 is larger than that of the inner glass plate 30, the light-emitting element 50 is arranged on the end surface 33 of the inner glass plate 30 through the fixing device 90, the fixing device 90 does not cover the low-emissivity layer 40, and the light-guiding element 70 is not required. The light emitted by the light-emitting element 50 directly passes through the end surface 33 of the inner glass plate 30 and is input into the inner glass plate 30. The light emitted by the light-emitting element 50 transmitted in the inner glass plate 30 is output from the fourth surface 32 after being transmitted by the light extraction element 60, and passes through the low-emissivity layer 40 to enter the interior of the vehicle, thereby achieving a lighting effect or an ambient light effect.

[0060] and Figure 4 The difference is, Figure 5 The fixing device 90 shown covers the low-emissivity layer 40, and there is no need for a light-guiding element 70. The light emitted by the light-emitting element 50 directly passes through the end face 33 of the inner glass plate 30 and is input into the inner glass plate 30. The light emitted by the light-emitting element 50 transmitted in the inner glass plate 30 is output from the fourth surface 32 after being transmitted by the light extraction element 60, and passes through the low-emissivity layer 40 into the interior of the vehicle, thereby achieving a lighting effect or an ambient light effect.

[0061] exist Figures 1 to 5 In the embodiment, the outer glass plate 10 is a single piece of glass, which is beneficial to reduce the thickness and weight of the window glass, thereby achieving lightweight. Figure 6In the embodiment, the outer glass plate 10 is a laminated glass, which includes a first glass plate 100, an intermediate layer 102 and a second glass plate 101. It is understandable that the outer glass plate 10 can also be an insulating glass or a vacuum glass. The outer glass plate 10 is laminated glass, insulating glass or vacuum glass, which is beneficial to improve the overall strength and heat insulation and sound insulation performance of the vehicle window glass.

[0062] In the present application, the light emitted by the light emitting element 50 has a transmission color RGB value after passing through the fourth surface 32 and the low-emissivity layer 40, and the RGB value satisfies: R:G≤1 and / or R:B≤1, thereby avoiding excessive proportion of red light and causing visual discomfort.

[0063] Preferably, 1:1.01≤R:G≤1:0.99 and 1:1.01≤R:B≤1:0.99, by controlling the RGB ratio of the transmission color of the inner glass plate and the low-emissivity layer to be relatively close, it is beneficial to make the inner glass plate with the low-emissivity layer close to or almost the same as the effect of using transparent glass, ensuring that the light emitted by the light-emitting element 50 entering the vehicle will not reduce the richness of the color of the ambient light, reduce the brightness of the ambient light, cause the color of the ambient light to be biased, or make the overall brightness of the lighting / ambience light uneven when passing through the inner glass plate 30 and the low-emissivity layer 40. More preferably, 1:1.005≤R:G≤1:0.995, and / or 1:1.005≤R:B≤1:0.995.

[0064] The outer glass plate 10 may be transparent glass, ultra-transparent glass or tinted glass; wherein the total iron content (in terms of Fe2O3) of the transparent glass is less than or equal to 0.1wt%, and the visible light transmittance of the transparent glass is greater than or equal to 85%; the total iron content (in terms of Fe2O3) of the ultra-transparent glass is less than or equal to 0.015wt%, and the visible light transmittance of the ultra-transparent glass is greater than or equal to 90%; the tinted glass can block the radiant heat of visible light and sunlight, so that the vehicle has a privacy function and a better heat insulation effect. The total iron content (in terms of Fe2O3) of the tinted glass is 0.9wt% to 2.2wt%, and specifically, it can be 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.05%, 2.1% or 2.2%, etc., but not limited thereto. The visible light transmittance of the tinted glass is less than 85%, preferably less than 70%, more preferably 5% to 45%, and specifically 5%, 10%, 15%, 20%, 30%, 40% or 45%, etc., but not limited thereto. The tinted glass may be green glass, gray glass, blue glass, brown glass, etc. In some embodiments, the tinted glass uses green glass with a visible light transmittance of 75%-83%; in some embodiments, the tinted glass uses gray glass with a visible light transmittance of 34%-45%; in some embodiments, the tinted glass uses gray glass with a visible light transmittance of 10%-33%.

[0065] The thickness of the outer glass plate 10 is 1.6 mm to 4.0 mm. For example, the thickness of the outer glass plate 10 can be 1.6 mm, 1.8 mm, 2.1 mm, 2.3 mm, 2.6 mm, 3.2 mm, 3.5 mm, 4.0 mm, etc., but is not limited thereto. In terms of the safety strength of the vehicle, the thickness of the outer glass plate 10 is preferably 2.1 mm to 3.5 mm. The material of the outer glass plate 10 can be soda-lime glass, high-aluminum glass, lithium-aluminum glass, borosilicate glass, etc.

[0066] Among them, the inner glass plate 30 can be transparent glass (standard white glass) or ultra-transparent glass (ultra-white glass); the total iron content of transparent glass is less than or equal to 0.1wt%, and the visible light transmittance of transparent glass is greater than or equal to 85%; the total iron content of ultra-transparent glass is less than or equal to 0.015wt%, and the visible light transmittance of ultra-transparent glass is greater than or equal to 90%. The thickness of the inner glass plate is 0.7mm-3.5mm. Exemplarily, the thickness of the inner glass plate 30 can be 0.7mm, 0.9mm, 1.1mm, 1.5mm, 1.6mm, 1.8mm, 2.1mm, 2.3mm, 2.6mm, 3.2mm, 3.5mm, etc., but not limited to this. Considering the lightweight of the vehicle, it is preferred that the thickness of the inner glass plate 30 is 0.7mm-2.1mm. The material of the inner glass plate 30 can be soda-lime glass, high aluminum glass, lithium aluminum glass or borosilicate glass.

[0067] The visible light transmittance TL2 of the inner glass plate 30 and the visible light transmittance TL3 of the inner glass plate 30 provided with the low-emissivity layer 40 satisfy: TL3 / TL2≥0.95, or TL3 / TL2≥1, that is, the low-emissivity layer 40 hardly reduces the visible light transmittance TL3 of the inner glass plate 30 provided with the low-emissivity layer 40, and thus hardly affects the lighting effect / ambient light effect of the light-emitting element 50. Preferably, the visible light transmittance TL2 of the inner glass plate 30 is ≥85%, or TL2≥90%; the visible light transmittance TL3 of the inner glass plate 30 provided with the low-emissivity layer 40 is ≥81%, or TL3≥85%, or TL3≥90%.

[0068] In the present application, the haze of the inner glass plate 30 provided with the low-emissivity layer 40 is less than or equal to 1%; or, the haze of the inner glass plate 30 provided with the low-emissivity layer 40 is less than or equal to 0.5%; or, the haze of the inner glass plate 30 provided with the low-emissivity layer 40 is less than or equal to 0.3%; the haze of the inner glass plate 30 provided with the low-emissivity layer 40 is lower, which is beneficial to improving the lighting effect / atmosphere light effect of the light-emitting element 50.

[0069] Wherein, the bonding layer 20 is a transparent thermoplastic polymer film or a colored thermoplastic polymer film, and the thickness of the bonding layer 20 is 0.38 mm-2.28 mm. For example, the thickness of the bonding layer 20 can be, but is not limited to, 0.38 mm, or 0.76 mm, or 1.14 mm, or 1.52 mm, or 1.9 mm, or 2.28 mm, or other values ​​between 0.38 mm and 2.28 mm. The material of the thermoplastic polymer film can be selected from at least one of polyvinyl butyral (PVB), polyurethane (PU), ethylene-vinyl acetate copolymer (EVA) and ionomer (SGP).

[0070] When the bonding layer 20 is a transparent thermoplastic polymer, the visible light transmittance of the transparent thermoplastic polymer is greater than or equal to 80%. For example, the visible light transmittance of the bonding layer 20 can be but is not limited to 80%, 85%, 90%, 95%, etc.

[0071] When the bonding layer 20 is a colored thermoplastic polymer film, the visible light transmittance of the colored thermoplastic polymer film is less than or equal to 50%. For example, the visible light transmittance of the bonding layer 20 can be, but is not limited to, 50%, or 44%, or 40%, or 38%, or 35%, or 32%, or 30%, or 27%, or 25%, or 23%, or 20%, or 18%, or 16%, or 13%, or 10%, or 8%, or 6%, or 5%, or 2%, or 1%, etc. Preferably, the visible light transmittance of the colored thermoplastic polymer film is less than or equal to 20%; more preferably, the visible light transmittance of the colored thermoplastic polymer film is less than or equal to 10%; further preferably, the visible light transmittance of the colored thermoplastic polymer film is less than or equal to 5%. The colored thermoplastic polymer film can be a gray thermoplastic polymer film, a green thermoplastic polymer film, or a blue thermoplastic polymer film.

[0072] The light emitting element 50 is used to emit light to form a lighting effect or an atmosphere light effect. The light emitted by the light emitting element 50 can be directly incident on the inner glass plate 30, or can be coupled into the inner glass plate 30. The light emitting element 50 can be any one of LED (inorganic light emitting diode), OLED (organic light emitting diode), MircoLED, MiniLED, EL (electroluminescent) elements. The white light emitting diode is generally composed of a combination of red + green + blue three-primary color LEDs.

[0073] The light extraction element 60 is used to transmit the light emitted by the light emitting element 50 entering the inner glass plate 30 to pass through the fourth surface 32 and the low-emissivity layer 40 to enter the interior of the vehicle. For example, the light extraction element 60 can change the direction of the light emitted by the light emitting element 50 transmitted in the inner glass plate 30 by reflection and / or scattering. The light extraction element 60 is selected from at least one of an internal engraved structure of the inner glass plate 30, an engraved structure on the third surface 31 of the inner glass plate 30, a printed structure on the third surface 31 of the inner glass plate 30, a film layer on the third surface 31 of the inner glass plate 30, and a film located between the outer glass plate 10 and the inner glass plate 30. The engraved structure can be formed inside the inner glass plate 30 by laser engraving, or formed on the third surface 31 of the inner glass plate 30. The printed structure can form a reflective ink or a scattering ink on the third surface 31 of the inner glass plate 30 by spraying, screen printing, etc. The film layer can be formed on the third surface 31 of the inner glass plate 30 by chemical vapor deposition or physical vapor deposition process, preferably a magnetron sputtering process. As for the form of a thin film, a commercially available light extraction film may be used.

[0074] The low-emissivity layer 40 is disposed on the fourth surface 32 of the inner glass plate 30, that is, on the inner surface of the window glass, to reduce the emissivity of the window glass. The low-emissivity layer 40 includes at least one transparent conductive oxide (TCO) layer, the material of the transparent conductive oxide layer can be selected from at least one of doped zinc oxide, indium tin oxide (ITO), and fluorine-doped tin oxide (FTO), and the doped zinc oxide can be one or more doped zinc oxides of elements such as aluminum, tungsten, hafnium, gallium, yttrium, niobium, and neodymium, and can specifically be at least one of aluminum-doped zinc oxide (AZO), yttrium-doped zinc oxide (YZO), hafnium- and aluminum-doped zinc oxide (HAZO), tungsten- and aluminum-doped zinc oxide (W-AZO), and gallium-doped zinc oxide (GZO).

[0075] The total physical thickness of the transparent conductive oxide layer in the low-emissivity layer 40 is 50nm-300nm. The low-emissivity layer 40 also includes at least two first dielectric layers, each transparent conductive oxide layer is located between two adjacent first dielectric layers, and the transparent conductive oxide layer and the first dielectric layer can be formed by magnetron sputtering process respectively. By optimizing the material and thickness of the transparent conductive oxide layer and the first dielectric layer, the low-emissivity layer can withstand subsequent high-temperature heat treatment or other bending forming processes, and the optical properties and mechanical properties of the obtained window glass can meet the use standards of automotive glass. In addition, the anti-reflection effect of the low-emissivity layer can also be achieved, which can reduce or even eliminate the obvious reflection of passengers and objects in the car on the sunroof glass due to mirror reflection, avoid visual interference to passengers, especially rear passengers, and improve user experience. Optionally, the material of the first dielectric layer is selected from at least one oxide, nitride, or nitrogen oxide of Zn, Ti, Si, Al, Sn, Se, Zr, Ni, In, Cr, W, Ca, Y, Nb, Cu, and Sm. For example, it can be silicon nitride (SiN), silicon oxide (SiO2), zinc tin oxide (ZnSnOx), zinc aluminum oxide (AZO), titanium oxide (TiOx), silicon zirconium nitride (SiZrNx), silicon aluminum nitride (SiAlNx), silicon aluminum oxide (SiAlOx), etc.

[0076] exist Figures 1 to 6 In the embodiment, the infrared reflection layer 80 can reflect infrared rays in sunlight, thereby reducing the total solar transmittance of the vehicle and improving the thermal comfort of the vehicle interior environment. The total solar transmittance (TTS) of the vehicle window glass with the infrared reflection layer 80 is less than or equal to 55%, more preferably less than or equal to 30%, further less than or equal to 20%, or even less than or equal to 15%. The lower the total solar transmittance, the better the thermal insulation performance of the vehicle window glass.

[0077] The infrared reflection layer 80 is disposed between the outer glass plate 10 and the adhesive layer 20, and can be disposed on the second surface 12 of the outer glass plate 10, or on a thermoplastic film such as PET, and the thermoplastic film provided with the infrared reflection layer 80 is sandwiched between the second surface 12 and the adhesive layer 20. In order to make the infrared reflection layer 80 reflect infrared rays in sunlight to the maximum extent, the outer glass plate 10 is preferably transparent glass or extra-transparent glass.

[0078] The infrared reflection layer 80 includes at least one metal layer and at least two second dielectric layers, and each metal layer is located between two adjacent second dielectric layers. The material of the metal layer can be selected from metals or metal alloys such as silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), etc., and the present application is preferably silver metal or silver alloy, wherein the silver alloy is preferably an alloy of silver and at least one of gold, aluminum, copper, and platinum. According to the needs of practical applications, the number of metal layers in the infrared reflection layer 80 can be exemplified as two, three, four, five or even more; taking silver metal or silver alloy as an example, there can be double silver infrared reflection layers, triple silver infrared reflection layers, quadruple silver infrared reflection layers, and five silver infrared reflection layers. The material of the second dielectric layer can be selected from at least one oxide, nitride, or oxynitride of Zn, Ti, Si, Al, Sn, Se, Zr, Ni, In, Cr, W, Ca, Y, Nb, Cu, Sm, La, Mg, Ce, Mo, Sb, and Bi, such as zinc tin oxide (ZnSnOx), zinc oxide (ZnO), tin oxide (SnOx), niobium oxide (NbOx), bismuth oxide (BiOx), zinc aluminum oxide (AZO), zirconium oxide (ZrOx), silicon zirconium nitride (SiZrNx), silicon aluminum nitride (SiALNx), titanium oxide (TiOx), etc.

[0079] Among them, the metal layer and the second dielectric layer can be formed by a magnetron sputtering process respectively, and the thickness of each metal layer is 4nm-20nm. By optimizing the material and thickness of the metal layer and the second dielectric layer, the infrared reflection layer can withstand subsequent high-temperature heat treatment or other bending forming processes, and the optical properties and mechanical properties of the obtained window glass can meet the use standards of automotive glass.

[0080] In some other embodiments, the vehicle window glass further includes a dimming element (not shown), which is disposed between the second surface 12 and the third surface 31. Specifically, the bonding layer 20 includes a first bonding layer and a second bonding layer, and the dimming element is located between the first bonding layer and the second bonding layer. The dimming element is used to adjust the visible light transmittance of the vehicle window glass to meet the optical performance in different usage scenarios.

[0081] The dimming element can be a polymer dispersed liquid crystal film (PDLC), a suspended particle film (SPD), an electrochromic film (EC), a dye liquid crystal film (LC), etc. The minimum visible light transmittance of the dimming element is less than or equal to 10%, such as 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0%, etc., but not limited to this. In addition, the maximum visible light transmittance of the dimming element is set as needed, such as 10%, 20%, 30%, 50%, 70%, 80%, 90%, etc., but not limited to this. For example: the visible light transmittance of the dimming element can be adjusted between 0% and 20%, or between 0.5% and 50%, or between 1% and 70%, etc., or between 5% and 90%, which can meet the requirements of visible light transmittance in multiple scenarios.

[0082] The vehicle window glass provided by the present application is described in detail below through specific embodiments and comparative examples. Figure 2 The inner glass plate 30 and the low-emissivity layer 40 of the vehicle window glass shown are tested:

[0083] Comparative Examples 1-4:

[0084] Comparative Example 1: Both the outer glass plate and the inner glass plate are made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick gray PVB, and no low-emissivity layer is provided;

[0085] Comparative Example 2: Both the outer glass plate and the inner glass plate are made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick gray PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 1, and the SiO2 layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0086] Comparative Example 3: Both the outer glass plate and the inner glass plate are made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick gray PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 1, and the SiO2 layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0087] Comparative Example 4: Both the outer glass plate and the inner glass plate are made of 2.1 mm thick green glass, the bonding layer is made of 0.76 mm thick transparent PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 1, and the SiO2 layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0088] The film layer structures and related parameters of the inner glass plate and the low-emissivity layer of Comparative Examples 1-4 are shown in Table 1.

[0089] Among them, the test methods of various parameters are as follows:

[0090] First transmittance TL1: the transmittance of the inner glass sheet of comparative example 1 and the inner glass sheets with low emissivity layers of comparative examples 2-4 to light with a wavelength of 380nm to 780nm, tested according to the method specified in ISO9050;

[0091] Transmitted color RGB: Based on the standard CIE 1931, the light emitted by the D65 light source is measured and calculated from the side of the low-emissivity layer, and then passes through the fourth surface and the low-emissivity layer, and has a transmitted color RGB value;

[0092] Emissivity e: Measured from the low emissivity layer side using an emissivity meter.

[0093] Visible light reflectivity: Tested according to the method specified in ISO9050, the visible light reflectivity of the window glass is measured and calculated from the fourth side;

[0094] Reflection color a value: Based on the CIE1976 standard, the a value of the reflection color Lab value of the window glass to the light emitted by the D65 light source is measured and calculated from the fourth side;

[0095] Reflection color b value: Based on the standard CIE1976, the b value of the reflection color Lab value of the window glass to the light emitted by the D65 light source is measured and calculated from the fourth side.

[0096] Table 1: Test results of comparative examples 1-4

[0097]

[0098]

[0099] From the contents of Table 1, we can see that:

[0100] The inner glass plate of Comparative Example 1 uses highly transparent glass and is not provided with a low-emissivity layer, so that the ratio of the transmitted color RGB is 1:1.001:1.002, which is almost close to 1:1:1, and the proportion of red light is the lowest. This can ensure that the light transmitted by the light extraction element into the vehicle passes through the inner glass plate without reducing the richness of the color of the ambient light, reducing the brightness of the ambient light, causing the color of the ambient light to be cast, or making the overall brightness of the lighting / ambient light uneven. However, it does not have a low-emissivity effect.

[0101] The inner glass plate of Comparative Example 2 uses highly transparent glass and is provided with a low-emissivity layer, which causes a large color cast in the RGB ratio of the transmitted color, R:G < 1:1.01 and R:B < 1:1.01. When the light entering the vehicle through the light extraction element passes through the inner glass plate and the low-emissivity layer, there are disadvantages such as reduced richness of the color of the ambient light, lowered brightness of the ambient light, color cast of the ambient light, or uneven overall brightness of the lighting / ambience light.

[0102] The inner glass plate of Comparative Example 3 adopts highly transparent glass and is provided with a low-emissivity layer, which causes a large color cast in the RGB ratio of the transmitted color. 1:1.01≤R:B≤1:0.990 meets the requirements, but R:G>1:0.990, so that when the light transmitted by the light extraction element into the vehicle passes through the inner glass plate, there are disadvantages such as reduced richness of the color of the ambient light, lowered brightness of the ambient light, color cast of the ambient light, or uneven overall brightness of the lighting / ambience light.

[0103] The inner glass plate of Comparative Example 4 uses highly transmittance green glass and is provided with a low-emissivity layer, which causes a large color cast in the RGB ratio of the transmitted color. 1:1.01≤R:G≤1:0.990 meets the requirements, but R:B>1:0.990, so that when the light provided by the light extraction element entering the vehicle passes through the inner glass plate, there are disadvantages such as reduced richness of the color of the ambient light, lowered brightness of the ambient light, color cast of the ambient light, or uneven overall brightness of the lighting / ambience light.

[0104] Comparative Examples 5-6 and Examples 1-2

[0105] Comparative Example 5: Both the outer glass plate and the inner glass plate are made of 2.1 mm thick gray glass, the bonding layer is made of 0.76 mm thick transparent PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 2, and the SiO2 layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0106] Comparative Example 6: Both the outer glass plate and the inner glass plate are made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick transparent PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 2, and the 70 nm SiO2 layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0107] Example 1: The outer glass plate and the inner glass plate are both made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick transparent PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 2, and the SiO2 layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0108] Example 2: The outer glass plate and the inner glass plate are both made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick transparent PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 2, and the SiO2 layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0109] The film layer structures and related parameters of the inner glass plate and the low-emissivity layer of Comparative Examples 5-6 and Examples 1-2 are shown in Table 2.

[0110] Table 2: Test results of Comparative Examples 5-6 and Examples 1-2

[0111]

[0112] From the contents of Table 2, we can see that:

[0113] The inner glass plate of comparative example 5 uses low-transmittance gray glass and is provided with a low-emissivity layer, so that the RGB ratio of the transmitted color has a large color cast, 1:1.01≤R:B≤1:0.990 meets the requirements, but R:G>1:0.990, so that when the light transmitted by the light extraction element into the vehicle passes through the inner glass plate, there are disadvantages such as reducing the richness of the color of the ambient light, reducing the brightness of the ambient light, causing the color of the ambient light to be cast, or making the overall brightness of the lighting / ambience light uneven. In addition, the inner glass plate provided in the low-emissivity layer has a first transmittance TL1 of the light emitted by the light-emitting element that is much less than 80%, which greatly reduces the overall brightness of the lighting / ambience light.

[0114] The inner glass plate of Comparative Example 6 uses transparent glass and is provided with a low-emissivity layer, which causes serious color cast in the RGB ratio of the transmitted color, R:G < 1:1.01 and R:B < 1:1.01, both of which do not meet the requirements. When the light entering the vehicle through the light extraction element passes through the inner glass plate, there are disadvantages such as reduced richness of the color of the ambient light, lowered brightness of the ambient light, color cast of the ambient light, or uneven overall brightness of the lighting / ambience light.

[0115] Embodiment 3-6

[0116] Example 3: The outer glass plate and the inner glass plate are both made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick gray PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 3, and the SiO2 layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0117] Example 4: The outer glass plate and the inner glass plate are both made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick gray PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 3, and the SiZrN layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0118] Example 5: The outer glass plate and the inner glass plate are both made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick gray PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 3, and the SiZrN layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0119] Example 6: The outer glass plate and the inner glass plate are both made of 2.1 mm thick transparent glass, the bonding layer is made of 0.76 mm thick gray PVB, the composition and physical thickness of the low-emissivity layer are shown in Table 3, and the SiZrN layer in the low-emissivity layer is the layer farthest from the fourth surface.

[0120] The film layer structures and related parameters of the inner glass plate and the low-emissivity layer of Examples 3-6 are shown in Table 3.

[0121] Table 3: Test results of Examples 3-6

[0122]

[0123]

[0124] From the contents of Table 2 and Table 3, we can see that:

[0125] The first transmittance TL1 of Examples 1-6 is all above 90%, and the highest can reach above 93%, which is beneficial to maintaining the overall brightness of the lighting / atmosphere light.

[0126] In the transmission color RGB ratio, at least one of R:G and R:B is less than or equal to 1:1, which can avoid visual discomfort caused by excessive proportion of red light. The transmission color RGB ratios of Examples 1-6 all satisfy 1:1.01≤R:G≤1:0.99 and 1:1.01≤R:B≤1:0.99, which is conducive to making the inner glass plate with a low-emissivity layer close to or almost the same as the effect of using transparent glass, ensuring that the light provided by the light extraction element entering the vehicle will not reduce the richness of the color of the ambient light, reduce the brightness of the ambient light, cause the color of the ambient light to be biased, or make the overall brightness of the lighting / ambience light uneven when passing through the inner glass plate.

[0127] The inner surface emissivity of the vehicle window glass of Examples 1-6 is less than 0.25, and the lowest can reach 0.17. The emissivity of these vehicle window glasses is less than or equal to 0.25, which can make the vehicle window glasses have low emissivity. In summer, it can effectively block the heat outside the vehicle from being transferred to the inside of the vehicle, and in winter, it can block the heat inside the vehicle from being lost to the outside, thereby achieving the effect of heat insulation in summer and heat preservation in winter.

[0128] The inner surface reflection color a value of the vehicle window glass of Examples 1-6 satisfies -5≤a≤2, and the b value satisfies -11≤b≤0. The color of the vehicle window glass observed from inside the vehicle is close to a neutral color or a visually comfortable color.

[0129] The visible light reflectivity of the inner surface of the vehicle window glass of Examples 1-6 is less than 4%, and is close to 2% recently, which can reduce or even eliminate the phenomenon of obvious reflections of passengers and objects in the car on the laminated glass due to mirror reflection, avoid visual interference to passengers, especially rear passengers, and improve passenger experience.

Claims

1. A vehicle window glass, characterized in that: The vehicle window glass comprises an outer glass plate, an inner glass plate and a bonding layer, the outer glass plate comprises a first surface and a second surface, the inner glass plate comprises a third surface and a fourth surface, and the bonding layer is located between the second surface and the third surface; The vehicle window glass further comprises a low-emissivity layer and a light-emitting element, wherein the low-emissivity layer is arranged on the fourth surface, the light-emitting element is installed on the vehicle window glass, and the light emitted by the light-emitting element can pass through the fourth surface and the low-emissivity layer; The inner glass plate provided with the low-emissivity layer has a first transmittance TL1 for the light emitted by the light-emitting element, and the TL1 is ≥ 80%; The emissivity of the vehicle window glass measured from the fourth surface side is e<0.

3.

2. The vehicle window glass according to claim 1, characterized in that: The emissivity of the vehicle window glass measured from the fourth surface side is e≤0.25, or e≤0.

2.

3. The vehicle window glass according to claim 1, characterized in that: The light emitting element is disposed on the first surface, or on the second surface, or on the third surface, or between the second surface and the third surface, or on the end surface of the outer glass plate.

4. The vehicle window glass according to claim 1, characterized in that: The light emitting element is disposed on the fourth surface, or on the end surface of the inner glass plate; the vehicle window glass further comprises at least one light extraction element, and the light emitted by the light emitting element passes through the fourth surface and the low-emissivity layer and enters the interior of the vehicle after being transmitted by the light extraction element; The light extraction element is disposed on the second surface, or on the third surface, or between the second surface and the third surface.

5. The vehicle window glass according to claim 1, characterized in that: The TL1≥85%, or the TL1≥90%, or the TL1≥92%.

6. The vehicle window glass according to claim 1, characterized in that: The light emitted by the light emitting element has a transmission color RGB value after passing through the fourth surface and the low-emissivity layer, and the RGB value satisfies: R:G≥1 and / or R:B≥1.

7. The vehicle window glass according to claim 6, characterized in that: 1:1.01≤R:G≤1:0.99 and 1:1.01≤R:B≤1:0.

99.

8. The vehicle window glass according to claim 6, characterized in that: 1:1.005≤R:G≤1:0.995, and / or 1:1.005≤R:B≤1:0.

995.

9. The vehicle window glass according to claim 1, characterized in that: The low-emissivity layer includes at least one transparent conductive oxide layer, the total physical thickness of the transparent conductive oxide layer is 50nm-300nm, the material of the transparent conductive oxide layer is selected from one or a combination of two or more of doped zinc oxide, indium tin oxide, and fluorine-doped tin oxide, and the doped zinc oxide is zinc oxide doped with one or a combination of two or more of aluminum, tungsten, hafnium, gallium, yttrium, niobium, and neodymium.

10. The vehicle window glass according to claim 9, characterized in that: The low-emissivity layer also includes at least two first dielectric layers, each of the transparent conductive oxide layers is located between two adjacent first dielectric layers, and the material of the first dielectric layer is selected from one or a combination of two or more of oxides, nitrides and oxynitrides of Zn, Ti, Si, Al, Sn, Se, Zr, Ni, In, Cr, W, Ca, Y, Nb, Cu and Sm.

11. The vehicle window glass according to claim 1, characterized in that: The outer glass plate is transparent glass, extra-transparent glass or tinted glass; wherein: The total iron content of the transparent glass in terms of Fe2O3 is less than or equal to 0.1wt%, and the visible light transmittance of the transparent glass is greater than or equal to 85%; The total iron content of the ultra-clear glass in terms of Fe2O3 is less than or equal to 0.015wt%, and the visible light transmittance of the ultra-clear glass is greater than or equal to 90%; The total iron content of the tinted glass calculated as Fe2O3 is 0.9wt% to 2.2wt%, the visible light transmittance of the tinted glass is less than 85%, and the tinted glass is green glass, gray glass, blue glass or brown glass.

12. The vehicle window glass according to claim 1, characterized in that: The outer glass plate is single-layer glass, hollow glass, vacuum glass or laminated glass.

13. The vehicle window glass according to claim 1, characterized in that: The visible light transmittance TL2 of the inner glass plate and the visible light transmittance TL3 of the inner glass plate provided with the low-emissivity layer satisfy: TL3 / TL2≥0.95, or TL3 / TL2≥1.

14. The vehicle window glass according to claim 13, characterized in that: The visible light transmittance of the inner glass plate is TL2≥85%, or TL2≥90%; the visible light transmittance of the inner glass plate with a low-emissivity layer is TL3≥81%, or TL3≥85%, or TL3≥90%.

15. The vehicle window glass according to claim 1, characterized in that: The haze of the inner glass sheet with low emissivity layer is less than or equal to 1%; Alternatively, the haze of the inner glass sheet provided with the low-emissivity layer is less than or equal to 0.5%; Alternatively, the haze of the inner glass sheet provided with the low-emissivity layer is less than or equal to 0.3%.

16. The vehicle window glass according to claim 1, characterized in that: The inner glass plate is transparent glass or extra-transparent glass; Wherein, the total iron content of the transparent glass in terms of Fe2O3 is less than or equal to 0.1wt%, and the visible light transmittance of the transparent glass is greater than or equal to 85%; The total iron content of the ultra-transparent glass in terms of Fe2O3 is less than or equal to 0.015wt%, and the visible light transmittance of the ultra-transparent glass is greater than or equal to 90%.

17. The vehicle window glass according to claim 1, characterized in that: The bonding layer is a transparent thermoplastic polymer film or a colored thermoplastic polymer film, the thickness of the bonding layer is 0.38mm-2.28mm, the material of the thermoplastic polymer film is selected from one or a combination of more than two of polyvinyl butyral, polyurethane, ethylene-vinyl acetate copolymer and ionic polymer; the visible light transmittance of the transparent thermoplastic polymer is greater than or equal to 80%; the visible light transmittance of the colored thermoplastic polymer film is less than or equal to 50%, or less than or equal to 20%, or less than or equal to 10%, or less than or equal to 5%.

18. The vehicle window glass according to claim 1, characterized in that: The light-emitting element is selected from at least one of LED, OLED, MircoLED, MiniLED and EL elements.

19. The vehicle window glass according to claim 4, characterized in that: The light extraction element is selected from at least one of a carved structure inside the inner glass plate, a carved structure on the third surface of the inner glass plate, a printed structure on the third surface of the inner glass plate, a film layer on the third surface of the inner glass plate, and a film located between the outer glass plate and the inner glass plate.

20. The vehicle window glass according to claim 1, characterized in that: An infrared reflection layer is provided between the outer glass plate and the bonding layer; and the total solar energy transmittance of the window glass is less than or equal to 55%, or less than or equal to 30%, or less than or equal to 20%, or less than or equal to 15%; The infrared reflection layer comprises at least one metal layer and at least two second dielectric layers, the metal layer is located between the two second dielectric layers, the material of the metal layer is selected from one of silver, gold, copper, aluminum, platinum and alloys of two or more of these metals, and the material of the second dielectric layer is selected from one of oxides, nitrides and oxynitrides containing one or a combination of two or more of Zn, Ti, Si, Al, Sn, Se, Zr, Ni, In, Cr, W, Ca, Y, Nb, Cu, Sm, La, Mg, Ce, Mo, Sb and Bi.

21. The vehicle window glass according to claim 1, characterized in that: The vehicle window glass also includes a dimming element, the bonding layer includes a first bonding layer and a second bonding layer, the dimming element is arranged between the first bonding layer and the second bonding layer, and the dimming element is selected from at least one of a polymer dispersed liquid crystal film, a suspended particle film, an electrochromic film, and a dye liquid crystal film.

22. The vehicle window glass according to claim 1, characterized in that: The a value of the reflected color of the inner surface of the vehicle window glass satisfies -5≤a≤2, and the b value satisfies -11≤b≤0.

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