Automobile window interlayer and manufacturing method thereof

Abstract

The invention relates to an automobile window interlayer, which comprises a first glass sheet and a second glass sheet, the first glass sheet and the second glass sheet are arranged in parallel and at a distance from each other, the first glass sheet and the second glass sheet are respectively provided with an inward facing surface and an outward facing surface, and at least one reflective structure and at least one light outcoupling element, where the at least one light outcoupling element is in contact with the at least one reflective structure and / or with the inwardly facing surface of the first glass sheet for coupling light out of the first glass sheet. The invention also relates to a vehicle equipped with such a vehicle window interlayer and to a method for producing such a vehicle window interlayer.

Description

[0001] This invention relates to an automotive window interlayer. It also relates to a vehicle equipped with the aforementioned automotive window interlayer, and a method for manufacturing the automotive window interlayer.

[0002] In recent years, the automotive industry has developed rapidly, and one of the fastest-growing technologies is car windows. Early car windows were simply single-pane glass, but today they have evolved into advanced panels that incorporate multiple layers of glass and integrate various technologies. The emergence of functional layers is an example of this development. These functional layers can change the transparency of the window based on the electric current applied to them. This switchable functional layer offers numerous advantages.

[0003] Another trend in the automotive industry is ambient lighting. Ambient lighting is increasingly being used as part of vehicle interior design. Light strips (most commonly LED strips) are placed in various locations within the vehicle for decorative purposes. Some light strips even have functionalities, such as alerting the driver. In the past, attempts have been made to couple light onto vehicle glass panels, directing the light output to desired locations and shapes. This can be achieved by aligning LED light sources with the edges of a glass pane and performing localized mechanical milling on the glass. Due to the localized variations in the glass surface, the light propagating within the glass is coupled out at the milled shape. While there is a desire to apply these lighting functions to automotive windows, this technology has not yet achieved significant success. In general, two main problems prevent these solutions from becoming viable.

[0004] First, a major drawback of the known solution is that these shapes are clearly visible when the LED light source is on. However, due to its milled structure, these shapes remain clearly visible even when the LED light source is off, thus affecting visibility. Second, when the light source shines on the glass panel, the luminous intensity of the milled shapes on the glass panel is quite uneven, which significantly diminishes its appearance. That is, the further away from the light source, the lower the intensity of the output coupled light. Furthermore, the same phenomenon was observed on the sides of the glass panel. This results in only a very small area being uniformly illuminated by the milled portions of the glass panel where light output is coupled. This problem is exacerbated by the use of tinted glass, as tinted glass absorbs more light, further reducing the intensity of available light. However, the trend in the automotive industry is towards increasingly larger window sizes (at least sunroofs). Therefore, there is a need to develop an automotive window interlayer to significantly reduce the aforementioned drawbacks of existing solutions. Especially when the lighting is off, this interlayer should have a smaller impact on the window, and more importantly, a more uniform appearance.

[0005] Therefore, the first objective of this invention is to provide an automotive window that can achieve more uniform light output coupling.

[0006] A second objective of this invention is to provide a car window that reduces the visibility of light output coupling when the headlights are not on.

[0007] A third objective of this invention is to provide a more easily adjustable optical output coupling structure.

[0008] The fourth objective of this invention is to provide an alternative lighting solution for automotive windows.

[0009] This invention provides an automotive window interlayer, comprising: - A first glass sheet, and an optional second glass sheet, the first glass sheet and the optional second glass sheet being substantially parallel and spaced apart from each other, the first glass sheet and the optional second glass sheet each having an inwardly facing surface and an outwardly facing surface; - At least one reflective structure, preferably disposed between the inward-facing surface of the first glass sheet and the inward-facing surface of the second glass sheet, wherein the at least one reflective structure is preferably a polymer-based reflective structure; - At least one light output coupling element, wherein the at least one light output coupling element is in contact with the at least one reflective structure and / or in contact with the inwardly facing surface of the first glass sheet, for coupling light out from the first glass sheet, preferably, the at least one first adhesive layer is disposed between the reflective structure and the first glass sheet, and the at least one second adhesive layer is disposed between the reflective structure and the second glass sheet, preferably, the light transmittance of the automotive window interlayer is less than 70%.

[0010] Here, the inward-facing surfaces of the first and second glass panes can be defined as the sides of the first and second glass panes facing each other. The outward-facing surfaces of the first and second glass panes can be defined as the sides of the first and second glass panes facing away from each other. Automotive window interlayers can be arranged in at least two directions within a vehicle. In a first direction, the first glass pane can be the outer glass pane of the vehicle. The first glass pane can be in contact with the external environment. In a second direction, the first glass pane can be the inner glass pane. In this case, the first glass pane can face the interior of the vehicle, such as the interior of the passenger compartment. The choice of direction depends on specific requirements. If light needs to be transmitted into the vehicle interior, it is preferable to arrange the first glass pane as the inner glass pane. Alternatively, if light needs to be transmitted outwards, the first glass pane can be arranged as the outer glass pane. Glass panes spaced apart from each other can be close to each other. The term "spaced apart" here can be understood as one or more layers of material being disposed between the first and second glass panes. Therefore, the first and second glass layers can be relatively close, for example, separated only by an adhesive layer. The term "fundamentally parallel" can be understood as parallel but with a deviation of a few degrees, such as 0.5 degrees, 1 degree, 2 degrees, 3 degrees, 4 degrees, or 5 degrees of non-parallelism. For example, this includes a car window interlayer containing a wedge-shaped adhesive layer to address ghosting issues in head-up displays. The first glass pane may form a light-guiding layer, at least locally. It is conceivable that the first and second glass panes at least partially overlap, preferably completely overlap.

[0011] By incorporating reflective structures, light loss can be reduced, for example, by minimizing light leakage through the first glass pane into the interlayer of the window. The reflective structure helps reflect light back to the first glass pane, allowing it to penetrate deeper or remain there longer without leaking into adjacent layers. In automotive glass, light leakage typically occurs on the inward-facing surface of the first glass pane. This is because the refractive index of air makes it difficult for light propagating along the plane of the glass pane to leak to the outward-facing surface. Due to the difference in refractive indices between air and glass, air makes it more difficult for light propagating inside the glass pane to escape outwards. However, the inward-facing surface of the glass pane is usually not adjacent to air, but rather to the next layer in the interlayer. According to existing technology, the layer adjacent to the glass pane is typically an adhesive layer. Since the refractive index of the adhesive layer may be roughly on the same order of magnitude as that of the glass, it is not uncommon for light propagating in the glass to leak from the glass pane into the adhesive layer and be at least partially absorbed by it. If this occurs, some light in the light guide is lost. Especially when using colored adhesive layers, leaked light is partially absorbed by the adhesive layer, at least within a portion of the spectrum, and typically does not return completely to the glass pane, at least not in the same color. This spectral variation is even more pronounced if the adjacent medium is a low-emissivity coating containing indium tin oxide (ITO). According to existing technology, light intensity can decrease by up to 10% per 100 mm. The closer the light is to the center of the glass pane, the more light leaks into the window interlayer, and the total light intensity gradient on the window interlayer can even reach as high as 80%, which is clearly visible to the naked eye. This reflective structure can prevent or at least reduce this effect. Therefore, the automotive window interlayer according to the invention provides a particularly superior solution when the automotive window interlayer is at least partially colored. In this respect, if the window interlayer couples light into the vehicle interior, its transmittance can be between 0% and 70%, particularly between 2% and 30%, and more specifically between 5% and 20%. For window interlayer materials that couple light out of the vehicle interior, even higher transmittance can be provided. In this case, the light transmittance can be between 18% and 70%. Furthermore, any of these interlayered window structures can have an additional layer with variable light transmittance. Light transmittance can be understood as the percentage of light incident on the outward-facing surface of the outer glass pane that reaches (particularly from) the inward-facing surface of the inner glass pane. The light transmittance of the interlayer and / or a specific layer can be defined as the percentage of light passing through the interlayer or layer. Preferably, the reflective structure has a specific refractive index such that light coupled into the first glass pane is almost completely reflected back into that glass pane, particularly eliminating light refraction into adjacent layers.

[0012] Preferably, the at least one reflective structure is a polymer-based reflective structure. Studies have found that using polyethylene terephthalate (PET) and / or polyethylene naphthalate (PEN) as the reflective structure can effectively retain light within the light guide. One advantage of polymer-based reflective structures is that their reflection is based on the principle of interference. Furthermore, the reflection can be optimized for specific wavelengths and reflection angles. This allows polymer-based reflective structures to retain more light within the light guide formed by the first glass sheet, thereby reducing reflectivity. Preferably, the first adhesive layer is an ultra-transparent adhesive layer with a transmittance of at least 85%, preferably at least 90% or 95%. It is even conceivable that the transmittance of the first adhesive layer is close to 100%. Preferably, the yellowness index of the first adhesive layer is less than 1 (measured using 3mm thick transparent glass based on ASTM E313 standard). Preferably, the ultra-transparent adhesive layer is a Trosifol ultra-transparent adhesive layer and / or a Saflex Crystal transparent adhesive layer. The first adhesive layer can be a PVB and / or TPU adhesive layer.

[0013] If functional layers, such as PDLC and / or SPD and / or EC, are provided, it is conceivable to integrate the reflective structure into the functional layers. Specifically, the reflective structure formed by PET and / or PEN layers can be formed by one of the PET or PEN layers of the functional layers. In particular, the PET or PEN layer in the functional layers facing the first glass sheet. This is especially advantageous because it completely eliminates the need for one layer.

[0014] At least one optical output coupling element may be configured to couple light out of the plane of the first glass plate. Therefore, at least one optical output coupling element allows light propagating within the plane of the first glass plate to be emitted from the glass plate. At least one optical output coupling element may also be referred to as a light extraction element, used to extract a portion of the light rays passing through the first glass plate, particularly the light rays directed towards the outward-facing surface of the first glass plate.

[0015] The reflective structure can be disposed directly or indirectly on the inward-facing surface of the first glass sheet. The reflective structure can cover almost the entire inward-facing surface of the first glass sheet. This allows the reflective structure to reflect most of the light back to the first glass sheet, thereby reducing light leakage into the window interlayer and contributing to more uniform light output coupling. The reflective structure can extend to optional light-shielding strips. The light-shielding strips can be disposed along a portion or the entire perimeter of the first glass sheet and / or the second glass sheet. If two light-shielding strips are provided, the reflective structure can extend beyond the inner perimeter of at least one light-shielding strip.

[0016] The reflective structure may include one or more non-reflective portions, particularly openings, more specifically through openings. That is, certain portions of the window interlayer may be substantially free of reflective structures. Alternatively, the reflective structure may include one or more local interruptions, particularly when these interruptions locally eliminate the characteristics of the reflective structure. At least one opening and / or interruption in the reflective structure may (but not necessarily) be at least partially aligned with at least one light output coupling element. In the latter case, it is particularly preferred that the opening and / or at least one light output coupling element is at least partially etched onto the inward-facing surface of the first glass sheet, for example by laser etching, mechanical etching, and / or chemical etching. Preferably, the laser-etched light output coupling element can be formed by subsurface laser engraving. The reflective structure may be at least partially printed or overprinted on at least one light output coupling element. Preferably, the overprinted reflective structure may be printed at least on the light output coupling element, preferably on almost the entire surface where the light output coupling element is located. In this case, light scattered into the interior of the window interlayer structure (which is typically absorbed by adjacent layers) can be reflected back. Surprisingly, this not only allows more light to be retained in the light guide but also increases the light intensity output of the light output coupling element. The ink suitable for this application is Ferro's TLU0050A "Lust Reflex Partial Mirror Coating," however, polymer-based inks are preferred. This is especially advantageous if the light output coupling element is transparent or translucent. Optionally, at least one reflective structure can be printed (particularly overprinted) on at least one (preferably each) light output coupling element. In the latter case, it is conceivable to provide a second reflective structure that covers at least one light output coupling element, but preferably also covers most of the surface. Conversely, a first reflective structure can be provided on almost the entire surface, and a second reflective structure can be provided on the first reflective structure in the area of ​​the underlying light output coupling element. This prevents light from leaking through the light output coupling element into the interlayer.

[0017] Preferably (but not necessarily), the reflective structure includes at least one low-refractive-index layer and / or at least one high-refractive-index layer, and more preferably, it includes a plurality of continuously alternating high-refractive-index layers and low-refractive-index layers. Preferably, both the low-refractive-index layer and the high-refractive-index layer are polymer-based refractive-index layers. One of the refractive-index layers (i.e., the low-refractive-index layer or the high-refractive-index layer) may be formed of a PET layer or a PEN layer, while the other layer (i.e., another layer of the high-refractive-index layer or the low-refractive-index layer) may be formed of a polymer base layer (e.g., a coating or resin) coated on the PET or PEN layer. It is conceivable that at least one reflective structure includes a first layer having a low refractive index and at least one layer having a high refractive index. In this application, low refractive index and high refractive index can be understood relative to the refractive index of the light-guiding medium (particularly the first glass sheet and / or the second glass sheet).

[0018] It is also conceivable that the reflective structure consists at least partially of a single reflective layer. This single reflective layer could be, for example, a single layer comprising PET and / or PEN. However, in some cases, the use of titanium dioxide (TiO2), particularly a sputtered titanium dioxide (TiO2) coating, is also conceivable. Optionally, multiple titanium dioxide (TiO2) layers can be provided. This single layer can contribute 30% of the light reflectivity. However, the disadvantage of such high reflectivity is that it may lead to undesirable aesthetic effects, especially in the case of a sunroof, for example, it is undesirable for rear passengers to see a mirror image of the front passenger or driver (head). Therefore, the total reflectivity as viewed from inside the vehicle is preferably less than 15%. When the term "reflection" is used, it can also be understood as a coating. It is conceivable that at least one coating containing highly reflective particles is provided. For example, this coating can be roller-coated, sprayed, and / or sputtered onto the window interlayer, directly applied to the glass sheet or plastic interlayer (e.g., PET film). By providing at least two (especially multiple) reflective layers, higher reflectivity can be achieved within a specific wavelength range, which is particularly advantageous for automotive applications. While it has been observed that a single reflective structure (e.g., a single reflective layer) can improve the light output coupling efficiency described in this invention, increasing the number of reflective layers can further improve the quality of the light guide layer (i.e., the first glass sheet). Regarding low-refractive-index layers and high-refractive-index layers, these can be understood as the reflective properties of each layer relative to the glass sheet and / or to each other. The initial layer of the reflective structure, i.e., the layer adjacent to or facing the inward-facing surface of the first glass sheet, is preferably a low-refractive-index reflective layer, such as a low-density SiO2 with a refractive index of 1.35 or a low-refractive-index modified adhesive layer. However, preferably, the refractive index of the initial layer is significantly lower than the refractive index of the first glass sheet. The refractive index of the side of the reflective structure facing the first glass sheet can be lower than the refractive index of the first glass sheet. This refractive index can deviate by at least 0.1 relative to the (average) refractive index of the glass. Typically, the refractive index of the glass is about 1.51. It is conceivable that the refractive index of the reflective layer and / or structure is about 1.80 to 3.00, especially in the case of a high-reflectivity layer, preferably 2.3. The critical angle for light reflection inside a light guide (e.g., a light guide formed from a first glass sheet) depends on the refractive index of its adjacent medium. On the air side of the first glass sheet, this critical angle is approximately 41 degrees; on the adhesive layer side of the first glass sheet, it is approximately 77 degrees. Therefore, optimization of reflection is necessary, especially in the range of 41 to 77 degrees. Since the critical angle between the glass and PET is approximately 68.8 degrees, a combination of multiple critical angles provides a suitable (especially excellent) reflective layer material. The refractive index of the low-refractive-index layer can be approximately 1 to 1.4, particularly 1.35. The reflective structure can be at least partially composed of at least one dielectric mirror structure. Due to the high reflectivity of metal-based coatings such as silver or titanium dioxide, selective reflection or so-called interference reflection based on alternating high and low refractive index polymer layers is preferred.These (resin-based) polymer coatings can be modified to exhibit high reflectivity at specific angles. For example, the Toray Picasus polymer coating angle control film has a reflectivity as low as 10% at an incident angle of less than 20 degrees, while its reflectivity is approximately 68% at an incident angle of 70 degrees. 3M also offers similar non-metallic coated films, such as 3MWCF (window tinting film).

[0019] Preferably (but not necessarily), the transmittance of the reflective structure and / or the dielectric mirror structure itself can be approximately 30% or 15%. Since PET and PEN are the most commonly used coating carrier plastic substrates, these, along with most other plastic substrates, have relatively low refractive indices. A structure with at least one high refractive index and at least one low refractive index alternating can be based on a low refractive index substrate with a high refractive index non-metallic coating. Furthermore, the adhesive layer typically also has a low refractive index and can also be used to carry the coating. Studies have found that introducing tint or reducing transmittance in reflective structures (especially dielectric mirrors) can yield surprisingly good results. This can potentially help significantly reduce the transmittance of automotive window interlayers. Therefore, it is sufficient to provide an adhesive layer with a lighter tint and higher transmittance. The combination of the tint of the reflective structure and the reduction of the tint of the adhesive layer creates a synergistic effect. The reflective structure not only reduces light leakage to the adhesive layer, but reducing the thickness of the tinted adhesive layer further enhances this effect. Therefore, performance is significantly improved, especially in terms of light output coupling.

[0020] The outward-facing surface of the first glass pane in an automotive window interlayer can form a light-emitting surface. The outward-facing surface of the second glass pane can form a non-light-emitting surface. However, this only applies when only a single light output coupling element is used, and only the light output is coupled to the first glass pane.

[0021] The automotive window interlayer may include multiple light output coupling elements. Preferably, these light output coupling elements form a light-emitting pattern or shape with each other. It is conceivable that these light output coupling elements are kept at a certain distance from each other. Alternatively, it is also conceivable that at least two light output coupling elements at least partially overlap. At least one light output coupling element may be disposed directly or indirectly on the inward-facing surface of the first glass sheet. Thus, the light output coupling element may be in direct contact with the inward-facing surface of the first glass sheet. However, it is also conceivable that the light output coupling element is at least partially formed on the inward-facing surface of the first glass sheet. In the latter case, at least one light output coupling element may be formed by grooves and / or recessed patterns on the inward-facing surface. At least one light output coupling element may be disposed directly or indirectly on the surface of the reflective structure facing away from the first glass sheet. Thus, in this example, the light output coupling element may be disposed on the side of the reflective structure facing the non-light-emitting side of the window interlayer. The latter allows the reflective structure to substantially cover the entire inward-facing surface of the first glass sheet, which helps to maintain excellent and constant light emissivity through the light output coupling element.

[0022] At least one light output coupling element can be printed, preferably digitally printed. Printing the light output coupling element allows for greater design flexibility. At least one light output coupling element can be at least partially composed of ceramic ink, preferably substantially transparent or translucent ceramic ink. Ceramic ink has been shown to improve the appearance of window interlayers. In particular, transparent and / or translucent ceramic inks can be printed with patterns and / or designs that are virtually invisible when the light is off. This is a significant improvement. It can make it appear like a regular window interlayer while presenting a decorative pattern when light is coupled to the first glass pane. The thickness of the printed ceramic light output coupling element can be between about 1 and 15 micrometers. It is conceivable that the thicknesses of at least two light output coupling elements can be offset from each other. The transparency of the printed transparent light output coupling element is 85%, preferably 90%, more preferably about 95%. In this case, the light output coupling element is substantially invisible when the lighting is off; it is visible when the lighting is on. For this purpose, it is preferable that the thickness of the light output coupling element increases with increasing distance from the light source. If multiple light output coupling elements are used, it is conceivable that each element has a different thickness to compensate for light leakage. Besides changing the printing thickness, it is also conceivable to increase the material density, particularly that the density can increase with increasing distance from the light source. This can compensate for light leakage in the first glass sheet, thereby further improving the uniformity of the output coupled light intensity. Furthermore, it is conceivable to achieve this without adding tinting or reflective structures. If light is coupled into the glass only from one side, the thickness and / or density of at least one light output coupling element located on the glass side opposite the light output coupling side will be the greatest. If light is coupled into the glass sheet from two or more edges, the thickness and / or density of the light output coupling element furthest from the light source will be the greatest. Alternatively, one or more light output coupling elements can be formed on the inward-facing surface and / or reflective structure of the first glass sheet by mechanical etching, chemical etching, and / or laser engraving.

[0023] To achieve the desired light output coupling in the light guide (i.e., the first glass plate), light scattering particles can be dispersed in at least one light output coupling element. These light scattering particles can be zirconium dioxide particles, nickel particles, etc. To increase the amount of light coupled out from the first glass plate, these light scattering particles can be randomly dispersed within the light output coupling element.

[0024] The window interlayer may also include at least one adhesive layer disposed between at least one reflective structure and a second glass pane. This adhesive layer may also be referred to as a bonding layer. According to this example, the window interlayer includes a single adhesive layer. By disposing of the adhesive layer between the reflective structure and the second glass pane, it can be (at least partially) ensured that light in the light guide does not leak into the adhesive layer. Therefore, more light can be retained when light is coupled out from the first glass pane, and the uniformity of light intensity in the width or length direction of the entire window interlayer can be improved. The light transmittance of at least one adhesive layer can be between 10% and 30%, particularly between 8% and 25%, more specifically 13%. This design is particularly advantageous if the adhesive layer is located between the first glass pane and the reflective layer, and the reflective structure or dielectric mirror structure can reduce the light transmittance of the entire window interlayer. However, if the adhesive layer is located between the first glass pane and the reflective layer, it is preferable to use an ultra-transparent adhesive layer and impart its coloring properties in a second adhesive layer located on the other side of the reflective layer. It is conceivable, and even preferred, that the reflective structure (especially a dielectric mirror) contributes approximately 50% to the coloring of the window interlayer to the adhesive layer. At least one adhesive layer may comprise at least two distinct portions in a direction from the first glass sheet to the second glass sheet, wherein at least a portion of the second portion is colored. The first and second portions are formed by two adhesive layers fused together. After fusion, the adhesive layers form a single adhesive layer. It is particularly noteworthy that the adhesive layers can be directly fused together, thus eliminating the need for additional intermediate layers. It is conceivable that a reflective structure is disposed on, or at least partially within, the first portion of the adhesive layer.

[0025] As an alternative to a single adhesive layer, an automotive window interlayer may include a first adhesive layer and a second adhesive layer, wherein the second adhesive layer is at least partially tinted. The first adhesive layer may be positioned closest to the first glass pane, and the second adhesive layer closest to the second glass pane. A functional layer may be disposed between the first and second adhesive layers. This functional layer may, for example, switch between transparent and opaque. Such a functional layer may be formed as an interlayer comprising a pair of thermoplastic layers (typically PET or PEN) with a functional film, such as liquid crystal, disposed between the PET or PEN layers. At least one reflective structure may be at least partially (preferably almost completely) disposed between the first glass pane and the first adhesive layer. However, at least one reflective structure may also be disposed between the first and second adhesive layers (preferably a polymer-based reflective structure). It is conceivable that, in the latter case, when the reflective structure is disposed between the first and second adhesive layers, the refractive index of the side of the reflective structure facing the first glass pane and / or the first adhesive layer will deviate from the refractive index of the first adhesive layer and / or the first glass pane. If a functional layer (e.g., PDLC and / or SPD and / or EC) is provided, it is conceivable that a reflective structure can be integrated within the functional layer. Specifically, a reflective structure formed by PET and / or PEN layers can be formed by one of the PET or PEN layers of the functional layer. In particular, the PET or PEN layer facing the first glass sheet in the functional layer can form a reflective structure.

[0026] In addition to these layers, the reflective structure may also be at least partially composed of micron and / or nanostructures, preferably formed on the inward-facing surface of the first glass sheet and / or on the side of the first adhesive layer (if coated) facing the first glass sheet.

[0027] The automotive window interlayer may also include at least one first light source for coupling light into the first glass sheet. Preferably, the light source is a plurality of LED light sources, but one or more laser (stimulated emission of light) light sources may also be provided to varying degrees. The at least one first light source may be disposed on the inward-facing surface and / or outward-facing surface of the first glass sheet, particularly toward the inward-facing surface and / or outward-facing surface. It should be noted that the present invention relates to a (decorative) automotive window interlayer, and therefore cannot be compared with conventional displays (e.g., displays of mobile devices) in terms of light coupling. This is mainly because the automotive window interlayer is preferably transparent (if desired) so that it can be viewed through the window. Therefore, coupling light into the first glass sheet in an inconspicuous manner is particularly difficult. Optionally, a portion of the side of the first glass sheet facing at least one light source (i.e., the inward-facing surface and / or outward-facing surface) is provided with one or more recesses, particularly grooves and / or recess patterns, wherein the grooves are sized such that light emitted from the light source can be coupled into the first glass sheet. Preferably, the light source and the groove are positioned close to the edge of the first glass sheet, preferably near a light-shielding strip (if present) on the outward-facing surface of the first glass sheet. Preferably, the shape and / or design of the groove allows light to couple onto the first glass sheet, particularly in that most of the light is coupled onto the first glass sheet in a direction opposite to the light-shielding strip. Optionally, a reflective material, such as tape or aluminum foil, may be provided on the side of the first glass sheet facing away from the first light source (at least in the area opposite the light source).

[0028] Optionally, the automotive window interlayer may further include a second light source for coupling light into the second glass pane. The second light source can be positioned similarly to the first light source. Therefore, it is conceivable that the light source faces the outward-facing surface and / or the inward-facing surface of the second glass pane. Optionally, grooves or channels similar to those on the first glass pane are provided on the second glass pane for coupling light into it.

[0029] Therefore, it is conceivable that the interlayer of a car window could also include: - At least one second reflective structure, preferably disposed between the inward-facing surface of the first glass sheet and the inward-facing surface of the second glass sheet; - At least one second light output coupling element, wherein the at least one second light output coupling element is in contact with the at least one reflective structure and / or with the inward-facing surface and / or outward-facing surface of the second glass sheet, for coupling light out of the second glass sheet. Similar effects to those of the first light output coupling element and the first reflective structure can be achieved for the second light output coupling element and the second reflective structure. It is conceivable that more reflective structures can be provided. The invention is not limited to providing light output coupling to only a single glass sheet, but can be similarly applied to other glass sheets in a car window interlayer.

[0030] It is conceivable that at least one first light output coupling element and at least one second light output coupling element mutually form a three-dimensional light output coupling pattern. This contributes to the overall design and appearance of the car window interlayer. Because of the presence of two reflective structures in this embodiment, the light output intensity of the first and second light output coupling elements can be kept relatively constant over most of the width or length of the car window interlayer. Typically, the reflective structure according to the invention can even allow light to be coupled only along one side (or a portion of that side) while still ensuring constant illumination of the light output coupling elements. This simplifies the design of luminous car window interlayers.

[0031] The first and / or second glass panes may be at least partially made of ultra-transparent glass. Optionally, at least a portion of at least one edge of the first glass pane may be provided with a reflective strip, particularly an aluminum foil strip. This may cause light to be reflected back into the window interlayer, thereby achieving higher light intensity without increasing the light source intensity. If the second glass pane is used as a light guide, this solution may also be adopted on the second glass pane. Furthermore, although not mandatory, at least one of the first and / or second glass panes may have at least one outer layer on its outward-facing surface. This at least one outer layer may be at least partially coated and / or printed. It is conceivable that this at least one outer layer consists at least partially of a low-refractive-index layer, a low-emissivity coating, and / or a layer containing titanium dioxide (TiO2). The low-emissivity coating may be coated on the outward-facing surface of the first glass pane. Preferably, the low-emissivity coating layer is coated on the outward-facing inner glass pane facing the vehicle interior. Providing a low-emissivity coating helps improve in-vehicle comfort and reduce air conditioning energy consumption, at least when in contact with the in-vehicle air. Low-refractive-index layers and / or high-reflectivity layers help reduce light leakage caused by low-emissivity coatings. Of particular note is that low-emissivity coatings alter the spectrum of light each time it is reflected within the light guide. If the light beam meets the critical angle of Snell's law in the light guide medium in contact with the second medium (which in this case might be the low-emissivity coating), the reflected (infrared) light is reduced. This phenomenon causes the color to shift from white to blue as the light travels away from the light source within the light guide. Because this invention allows light to be confined within the light guide and internally reflected within an angle range of 41-77 degrees, the number of reflections is also reduced, resulting in a lower color shift rate compared to older technologies.

[0032] The present invention also relates to a vehicle equipped with an automotive window interlayer according to the present invention, preferably wherein the automotive window interlayer forms a sunroof when the interior is illuminated, or forms other glass besides a sunroof when light shines on the exterior of the vehicle.

[0033] This invention also relates to a method for manufacturing an automotive window interlayer, particularly an automotive window interlayer according to the present invention, comprising the following steps: A) Provide a first glass plate and a second glass plate; B) At least one reflective structure is provided between the first glass sheet and the second glass sheet, preferably, the reflective structure is a polymer-based reflective structure; C) Provide one or more optical output coupling elements, wherein the optical output coupling elements are in contact with the first glass plate provided in step A) and / or with the reflective structure provided in step B).

[0034] D) At least one adhesive layer is provided between the reflective structure and one or more light output coupling elements, or between the reflective structure and the second glass plate. Preferably, the light transmittance of the automotive window interlayer is less than 70%. The advantages of the method according to the invention are the same as those explained for various aspects of the automotive window interlayer. Preferably, the adhesive layer facing the first glass pane is a transparent adhesive layer with a light transmittance greater than 90%. The method may further include the following steps: E) One or more openings are provided in at least one reflective structure.

[0035] In addition (but not necessarily), one or more optical output coupling elements can also be provided by laser engraving, mechanical etching, and / or chemical etching. It is also conceivable that creating one or more openings in the reflective structure is performed simultaneously with providing one or more optical output coupling elements.

[0036] Alternative embodiments of the invention are given by way of the following non-limiting provisions, which may be combined with one or more technical aspects set forth in this application: 1. Automotive window interlayer, including: - A first glass sheet and a second glass sheet, the first glass sheet and the second glass sheet being substantially parallel and spaced apart from each other, the first glass sheet and the second glass sheet each having an inwardly facing surface and an outwardly facing surface; - At least one reflective structure is disposed between the inward-facing surface of the first glass sheet and the inward-facing surface of the second glass sheet; - At least one optical output coupling element, wherein the at least one optical output coupling element is in contact with the at least one reflective structure and / or with the inwardly facing surface of the first glass sheet, for coupling light out of the first glass sheet.

[0037] The light transmittance of the automotive window interlayer is less than 70%.

[0038] 2. The automotive window interlayer according to Clause 1, wherein the reflective structure is disposed directly or indirectly on the inwardly facing surface of the first glass pane.

[0039] 3. The automotive window interlayer according to paragraph 1 or 2, wherein the reflective structure covers almost the entire inward-facing surface of the first glass pane.

[0040] 4. The automotive window interlayer according to any of the preceding claims, wherein the reflective structure includes one or more openings.

[0041] 5. The automotive window interlayer according to Article 4, wherein at least one opening in the reflective structure is at least partially aligned with at least one light output coupling element.

[0042] 6. The automotive window interlayer according to any of the preceding claims, wherein the reflective structure comprises at least one high refractive index layer and / or at least one low refractive index layer, preferably comprising a plurality of continuously alternating high refractive index layers and low refractive index layers.

[0043] 7. The automotive window interlayer according to any of the preceding claims, wherein the reflective structure is at least partially composed of at least one dielectric mirror structure.

[0044] 8. The automotive window interlayer according to Article 6 or 7, wherein the light transmittance of the reflective structure or dielectric mirror structure is approximately 40% to 70%.

[0045] 9. The automotive window interlayer according to any of the preceding claims, wherein the refractive index of at least one side of the reflective structure facing the first glass sheet is lower than the refractive index of the first glass sheet.

[0046] 10. The automotive window interlayer according to any of the preceding claims, wherein the outward-facing surface of the first glass pane of the automotive window interlayer is a light-emitting surface.

[0047] 11. The automotive window interlayer according to any of the preceding claims, wherein the automotive window interlayer includes a plurality of optical output coupling elements.

[0048] 12. The automotive window interlayer according to any of the preceding claims, wherein at least one light output coupling element is disposed directly or indirectly on the inwardly facing surface of the first glass sheet.

[0049] 13. The automotive window interlayer according to any of the preceding claims, wherein at least one light output coupling element is disposed directly or indirectly on the surface of the reflective structure opposite to the first glass sheet.

[0050] 14. The automotive window interlayer according to any of the preceding claims, wherein at least one light output coupling element is a printed, preferably digitally printed, and / or chemically etched, and / or laser-etched light output coupling element.

[0051] 15. The automotive window interlayer according to any of the preceding claims, wherein at least one light output coupling element is at least partially composed of ceramic ink, preferably a substantially transparent or translucent ceramic ink.

[0052] 16. The automotive window interlayer according to any of the preceding claims, wherein light scattering particles are dispersed in at least one light output coupling element.

[0053] 17. The automotive window interlayer according to any of the preceding claims, wherein the window interlayer includes at least one adhesive layer disposed between the at least one reflective structure and the second glass pane.

[0054] 18. The automotive window interlayer according to Article 17, wherein the light transmittance of the at least one adhesive layer is between 10% and 30%.

[0055] 19. The automotive window interlayer according to either Article 17 or 18, wherein at least one adhesive layer comprises at least two distinct portions along a direction from the first glass sheet to the second glass sheet, wherein at least the second portion is at least partially colored.

[0056] 20. The automotive window interlayer according to Article 19, wherein the first portion and the second portion are formed by two mutually fused adhesive layers.

[0057] 21. The automotive window interlayer according to Article 19 or 20, wherein the reflective structure is disposed on or at least partially located within the first portion of the adhesive layer.

[0058] 22. The automotive window interlayer according to any of the preceding claims, wherein the automotive window interlayer comprises a first adhesive layer and a second adhesive layer, wherein the second adhesive layer is at least partially colored.

[0059] 23. The automotive window interlayer according to Article 22, wherein the at least one reflective structure is substantially entirely disposed between the first glass pane and the first adhesive layer.

[0060] 24. The automotive window interlayer according to Article 22, wherein the at least one reflective structure is disposed between the first adhesive layer and the second adhesive layer.

[0061] 25. The automotive window interlayer according to Article 24, wherein the refractive index of the side of the reflective structure facing the first adhesive layer is lower than the refractive index of the first glass sheet and / or the first adhesive layer.

[0062] 26. The automotive window interlayer according to any of the preceding claims, wherein the reflective structure is at least partially formed of micron and / or nanostructures, preferably, the micron and / or nanostructures are formed on or inside the inward-facing surface of the first glass sheet.

[0063] 27. The automotive window interlayer according to any of the preceding claims, wherein the automotive window interlayer further includes at least one first light source, wherein the first light source is used to couple light into the first glass sheet.

[0064] 28. The automotive window interlayer according to Article 27, wherein the at least one first light source is disposed on the inward-facing surface and / or the outward-facing surface of the first glass pane.

[0065] 29. The automotive window interlayer according to Article 28, wherein a portion of the side of the first glass sheet facing the at least one light source is provided with one or more recesses, particularly grooves and / or recess patterns, wherein the dimensions of the recesses are all designed to couple light emitted by the light source into the first glass sheet.

[0066] 30. The automotive window interlayer according to any one of Articles 27 to 29 further includes a second light source, wherein the second light source is used to couple light into the second glass sheet.

[0067] 31. The automotive window interlayer as described in Article 30 further includes: - At least one second reflective structure is disposed between the inward-facing surface of the first glass sheet and the inward-facing surface of the second glass sheet; - At least one second optical output coupling element, wherein the at least one second optical output coupling element is in contact with the inwardly facing surface of the second glass sheet for coupling light out of the second glass sheet.

[0068] 32. The automotive glass according to Article 31, wherein the at least one first light output coupling element and the at least one second light output coupling element mutually form a three-dimensional light output coupling pattern.

[0069] 33. The automotive window interlayer according to any of the preceding claims, wherein the first glass pane and / or the second glass pane are at least partially made of ultra-transparent glass.

[0070] 34. The automotive window interlayer according to any of the preceding claims, wherein at least a portion of the edge of the first glass pane is provided with a reflective strip, particularly an aluminum foil strip.

[0071] 35. A vehicle having an automotive window interlayer according to any one of the preceding claims, preferably wherein the automotive window interlayer forms a sunroof.

[0072] 36. A method for manufacturing an automotive window interlayer, particularly comprising manufacturing an automotive window interlayer according to any one of Articles 1 to 34, comprising the following steps: A) Provide a first glass plate and a second glass plate; B) Provide at least one reflective structure between the first glass sheet and the second glass sheet; C) Provide one or more optical output coupling elements, wherein the optical output coupling elements are in contact with the first glass plate provided in step A) and / or with the reflective structure provided in step B); D) Provide at least one adhesive layer between the reflective structure and the one or more optical output coupling elements, or between the reflective structure and the second glass sheet. The light transmittance of the automotive window interlayer is less than 70%.

[0073] 37. A method for manufacturing an automotive window interlayer according to Article 36, comprising the following steps: E) Provide one or more openings in the at least one reflective structure.

[0074] 38. The method for manufacturing automotive window interlayer according to Article 36 or 37, wherein the one or more light output coupling elements are provided by laser cutting, mechanical etching and / or chemical etching.

[0075] The invention will now be further described based on the following non-limiting drawings, in which: - Figure 1 A top view of an automotive window interlayer according to an embodiment of the present invention is shown; - Figure 2 A cross-sectional view of an automotive window interlayer according to an embodiment of the present invention is shown; - Figure 3 This illustrates another scheme for optical coupling in the interlayer of a car window; and - Figure 4 An example of another scheme for the optical output coupling element is shown.

[0076] Figure 1 A schematic diagram of an automotive window interlayer 100 according to a non-limiting embodiment of the present invention is shown. The first glass pane 102 shown is viewed from either the top or bottom, depending on the light-emitting surface of the window interlayer 100. As shown, the automotive window interlayer 100 includes a plurality of light output coupling regions 101. In these regions, light passing through the glass pane is coupled out of the automotive window interlayer 100, making it visible from the outside. The outside here can be the interior or exterior of the vehicle, depending on the light-emitting surface of the window interlayer 100.

[0077] Figure 2An example cross-section of an automotive window interlayer 100 is shown. As shown, a first glass pane 103 forms a light guide for the window interlayer 100. A light source 109 is positioned at its edge to couple light into the first glass pane 103. Light 115 propagates along the plane of the first glass pane 103. A second glass pane 104 is positioned at a distance from the inward-facing surface 120 of the first glass pane 103. Various components are positioned between the first glass pane 102 and the second glass pane 104. A light-shielding strip 111 is visible along the edge on the inward-facing surface 117 of the second glass pane 104 and the outward-facing surface 119 of the first glass pane 103. These positions are preferred for the light-shielding strip 111, especially when the first glass pane 103 forms the inner glass pane of the automotive window interlayer 101. The light-shielding strip 111 helps to conceal various (electronic) connections from view. If the light-shielding strip contacts the light guide and is located behind the light source, the strip is preferably white, and / or the light source is a laser. It is conceivable that a second black strip is provided on the white strip. This non-limiting embodiment also illustrates the presence of a first adhesive layer 105 and a second adhesive layer 106. While providing two separate adhesive layers 105 and 106 may offer some advantages, it is not mandatory. The first adhesive layer 105 is particularly an ultra-transparent adhesive layer with a transmittance of at least 85%, preferably at least 90% or 95%. As shown, a reflective structure 108 (which may be polymer-based) is disposed between the first adhesive layer 105 and the second adhesive layer 106. Preferably, the refractive index of the first surface of the reflective structure 108 or the first adhesive layer 105 facing the medium deviates by at least 0.1 relative to the refractive index of the first glass sheet 10 and / or the first adhesive layer 105. Preferably, this reflective refractive index deviates downwards. For this purpose, the first adhesive layer 105 is a transparent adhesive layer 105. The refractive index of this transparent adhesive layer is comparable to that of the glass. Therefore, when the light 115 propagating inside the first glass sheet reaches the first adhesive layer 105, it is easily refracted and continues to propagate within the first adhesive layer 105. By providing the high-reflectivity structure 108, it can be ensured that less light is absorbed, or even reflected back to the first glass sheet 103. Therefore, it is foreseeable that the first glass sheet 103 and the first adhesive layer 105 together constitute a light guide. The reflective structure 108 ensures that the light 115 propagating in the light guide remains within the light guide and does not accidentally leak into the window interlayer 100. The reflective structure 108 can be formed in different ways. It is conceivable that the reflective structure 108 is at least partially composed of a reflective layer and / or coating with significantly different refractive indices. However, it is also conceivable that the reflective structure is at least partially composed of a dielectric mirror structure. Alternatively, the reflective structure 108 can be provided in the first glass sheet 103 in the form of a micron and / or nanostructure. However, in the latter case, it is preferable to provide the reflective structure in other locations within the window interlayer 100.Specifically, when the reflective structure 108 is a micrometer or nanometer structure, it is preferably positioned at the location indicated by the first dashed line 108b. While this location is preferred for micrometer and / or nanometer structures, other examples of the reflective structure 108 can also be positioned at this location. Another alternative location for the reflective structure 108 is indicated by the second dashed line 108a. The location of the first dashed line 108b and the second dashed line 108a is particularly preferred. These locations essentially prevent light 115 propagating in the light guide from leaking into the window interlayer 100, except in areas where light needs to be coupled out of the window interlayer 100. This is primarily because the reflective structure 108 is directly adjacent to the first glass pane 103. One or more light output coupling elements 107 are provided, which can couple light out of the area indicated by 116 of the first glass pane 103. Therefore, when viewed along the direction in which light is coupled out of the area indicated by 116 of the first glass pane, the light output coupling element 107 emits light. Thus, in this embodiment, the window pane 100 includes a light-emitting surface 120 and a non-light-emitting surface 112. Thus, one or more light output coupling elements can be used to display signs, patterns, etc. They emit light when the light source 109 is turned on. The reflective structure 108 according to the invention allows the light output coupling elements 107 to couple light from the first glass plate 103 to the area shown 116 in a certain way, such that almost all coupled light 116 has the same intensity. This makes the appearance of the luminescent pattern more aesthetically pleasing. One or more light output coupling elements 107 can be formed by printing. It is conceivable that the light output coupling elements 107 are formed by printing substantially transparent and / or translucent ceramic ink. This provides great flexibility and precision.

[0078] Figure 3 An example of a car window interlayer 100 is shown, whose structure is largely similar to... Figure 2 The window interlayer shown is similar. However, Figure 3 A different method of coupling light into the first glass plate 103 in the region shown in 115 is illustrated. Figure 2 The light from the edge of the first glass plate 103 couples into different directions. Figure 3The light is coupled into the area shown at 115 from the outward-facing surface 119 of the first glass plate 103. The advantage of this method is that it does not occupy any space in the width direction of the window interlayer 100, nor does it create a single-pane glass area, thus avoiding safety hazards. However, the light absorption of the dark shading strip is also reduced. The light source 109 faces a portion of the outward-facing surface 119 of the first glass plate 103. This outward-facing surface 119 has recessed portions, specifically multiple grooves 113. These grooves 113 couple the light emitted by the light source 109 into the grooves 115 of the first glass plate 103. After the light 115 coupled to the glass plate 103 reaches the light output coupling element 107, the light is coupled out from the area shown at 116 of the first glass plate 103, causing the area of ​​the light output coupling element to appear luminous, at least as observed from the luminous surface 110 of the window interlayer 100. Although in Figure 2 and Figure 3 The light guide uses only a single glass plate 103, but it is conceivable that the same design could be applied to a second glass plate. This might allow light to be coupled out in two different directions, although light could also be coupled out in the same direction.

[0079] Figure 4 Another embodiment of the optical output coupling element 107 of the present invention is shown in simplified schematic form. The figure shows a first glass plate 103, but it should be noted that the same approach can also be used for a second glass plate 104 (not shown), if necessary. In this example, the reflective structure 108 is directly disposed on the inwardly facing surface 120 of the first glass plate. In this example, the reflective structure 108 may be a dielectric mirror structure 108. Subsequently, it is conceivable that at least one optical output coupling element 107 is formed by a partial recess 121 disposed on the reflective structure 108 and the first glass plate 103. It is noteworthy that the recess 121 extends into the first glass plate 103, such that the recessed portion can serve as the optical output coupling element 107.

[0080] The inventive concepts described above are illustrated through several exemplary embodiments. It is conceivable that a single inventive concept (including inventive details) can be applied without simultaneously applying the other details in the examples. It is unnecessary to elaborate on all possible combinations of the above inventive concepts, as those skilled in the art will understand that many inventive concepts can be (re)combined to obtain specific applications and / or alternative embodiments.

[0081] Ordinal numbers used in this document, such as “first,” “second,” and “third,” are for identification purposes only. Therefore, the use of a “second” component does not necessarily require the simultaneous presence of a “first” component. “Complementary” or “synergistic” components refer to components configured to work synergistically with each other. However, for this purpose, these components do not necessarily have to be complementary. The verb “comprising” and its various forms, as used in this patent disclosure, refer not only to “including,” but also to “containing,” “mainly composed of,” “formed by,” and their various forms.

Claims

1. A car window interlayer, comprising: - A first glass sheet and a second glass sheet, the first glass sheet and the second glass sheet being substantially parallel and spaced apart from each other, the first glass sheet and the second glass sheet each having an inwardly facing surface and an outwardly facing surface; - At least one reflective structure disposed between the inwardly facing surface of the first glass sheet and the inwardly facing surface of the second glass sheet, wherein the at least one reflective structure is a polymer-based reflective structure; - At least one optical output coupling element, wherein the at least one optical output coupling element is in contact with the inwardly facing surface of the first glass plate for coupling light out of the first glass plate; - At least one first adhesive layer disposed between the reflective structure and the first glass sheet; and at least one second adhesive layer disposed between the reflective structure and the second glass sheet; The light transmittance of the automotive window interlayer is less than 70%.

2. The automotive window interlayer according to claim 1, wherein, The first adhesive layer is an ultra-transparent adhesive layer with a light transmittance of at least 85%, preferably at least 90% or 95%.

3. The automotive window interlayer according to claim 1 or 2, wherein, The reflective structure covers almost the entire inward-facing surface of the first glass sheet.

4. The automotive window interlayer according to any one of the preceding claims, wherein, The reflective structure includes one or more openings.

5. The automotive window interlayer according to claim 4, wherein, At least one opening in the reflective structure is at least partially aligned with at least one optical output coupling element.

6. The automotive window interlayer according to any one of the preceding claims, wherein, The reflective structure includes at least one high refractive index layer and / or at least one low refractive index layer, preferably, it includes a plurality of continuously alternating high refractive index layers and low refractive index layers.

7. The automotive window interlayer according to any of the preceding claims, wherein, The reflective structure is at least partially formed by at least one dielectric mirror structure.

8. The automotive window interlayer according to claim 6 or 7, wherein, The light transmittance of the reflective structure or dielectric mirror structure is approximately 40% to 70%.

9. The automotive window interlayer according to any of the preceding claims, wherein, The refractive index of the reflective structure on at least one side facing the first glass sheet is lower than the refractive index of the first glass sheet.

10. The automotive window interlayer according to any of the preceding claims, wherein, The outward-facing surface of the first glass pane in the automotive window interlayer is a light-emitting surface.

11. The automotive window interlayer according to any of the preceding claims, wherein, The automotive window interlayer includes multiple light output coupling elements.

12. The automotive window interlayer according to any of the preceding claims, wherein, At least one optical output coupling element is disposed directly or indirectly on the inward-facing surface of the first glass plate.

13. The automotive window interlayer according to any of the preceding claims, wherein, At least one optical output coupling element is disposed directly or indirectly on the surface of the reflective structure opposite to the first glass plate.

14. The automotive window interlayer according to any of the preceding claims, wherein, At least one optical output coupling element is a printed, preferably digitally printed, and / or chemically etched, and / or laser-etched optical output coupling element.

15. The automotive window interlayer according to any of the preceding claims, wherein, At least one optical output coupling element is at least partially made of ceramic ink, preferably a substantially transparent or translucent ceramic ink.

16. The automotive window interlayer according to any of the preceding claims, wherein, Light scattering particles are dispersed in at least one optical output coupling element.

17. The automotive window interlayer according to any of the preceding claims, wherein, The light transmittance of the at least one second adhesive layer is between 10% and 30%.

18. The automotive window interlayer according to any of the preceding claims, wherein, At least one adhesive layer comprises at least two distinct portions along the direction from the first glass sheet to the second glass sheet, wherein at least the second portion is at least partially colored.

19. The automotive window interlayer according to claim 18, wherein, The first part and the second part are formed by two adhesive layers fused together.

20. The automotive window interlayer according to claim 18 or 19, wherein, The reflective structure is disposed on the first portion of the adhesive layer or at least partially located within the first portion of the adhesive layer.

21. The automotive window interlayer according to any of the preceding claims, wherein, The at least one reflective structure is disposed between the first adhesive layer and the second adhesive layer.

22. The automotive window interlayer according to claim 21, wherein, The refractive index of the side of the reflective structure facing the first adhesive layer is lower than the refractive index of the first glass sheet and / or the first adhesive layer.

23. The automotive window interlayer according to any of the preceding claims, wherein, The reflective structure is at least partially formed of micron and / or nanostructures, preferably formed on or inside the inward-facing surface of the first glass sheet.

24. The automotive window interlayer according to any of the preceding claims, wherein, The automotive window interlayer also includes at least one first light source, wherein the first light source is used to couple light into the first glass sheet.

25. The automotive window interlayer according to claim 24, wherein, The at least one first light source is disposed on the inward-facing surface and / or the outward-facing surface of the first glass sheet.

26. The automotive window interlayer according to claim 25, wherein, A portion of the side of the first glass sheet facing the at least one light source is provided with one or more recesses, particularly grooves and / or recess patterns, wherein the dimensions of the recesses are all designed to couple light emitted by the light source into the first glass sheet.

27. The automotive window interlayer according to any one of claims 24-26, further comprising a second light source, wherein, The second light source is used to couple light into the second glass plate.

28. The automotive window interlayer according to claim 27, further comprising: - At least one second reflective structure, preferably a polymer-based second reflective structure, is disposed between the inward-facing surface of the first glass sheet and the inward-facing surface of the second glass sheet; - At least one second optical output coupling element, wherein the at least one second optical output coupling element is in contact with the inwardly facing surface of the second glass sheet for coupling light out of the second glass sheet.

29. The automotive glass according to claim 28, wherein, The at least one first optical output coupling element and the at least one second optical output coupling element form a three-dimensional optical output coupling pattern with each other.

30. The automotive window interlayer according to any of the preceding claims, wherein, The first glass sheet and / or the second glass sheet are at least partially made of ultra-transparent glass.

31. The automotive window interlayer according to any of the preceding claims, wherein, At least a portion of the edge of the first glass sheet is provided with a reflective strip, particularly an aluminum foil strip.

32. The automotive window interlayer according to any of the preceding claims, wherein, The reflective structure includes polyethylene terephthalate (PET) and / or polyethylene naphthalate (PEN).

33. A vehicle having an automotive window interlayer according to any of the preceding claims, preferably wherein the automotive window interlayer forms a sunroof.

34. A method for manufacturing an automotive window interlayer, particularly an automotive window interlayer according to any one of claims 1-32, comprising the following steps: A) Provide a first glass plate and a second glass plate; B) Provide at least one polymer-based reflective structure between the first glass sheet and the second glass sheet; C) Provide one or more optical output coupling elements, wherein each optical output coupling element is in contact with the first glass plate provided in step A) and / or with the reflective structure provided in step B); D) Provide at least one adhesive layer between the reflective structure and the one or more optical output coupling elements. The light transmittance of the automotive window interlayer is less than 70%.

35. The method for manufacturing an automotive window interlayer according to claim 34, comprising the following steps: E) Provide one or more openings in the at least one reflective structure.

36. The method for manufacturing an automotive window interlayer according to claim 34 or 35, wherein, The one or more optical output coupling elements are provided by laser cutting, mechanical etching, and / or chemical etching.

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