CN117320879A - Composite glass panel with first reflective layer and second reflective layer - Google Patents

Abstract

The invention relates to a composite glass plate (1) with a projection area (B) and a main see-through area (H), which at least includes an outer glass plate (2) with an outer surface (I) and an inner surface (II). Inner glass pane (3) of surface (III) and inner surface (IV), thermoplastic intermediate layer (4), opaque masking layer (5), first reflective layer (6) and second reflective layer (7), in which projection Area (B) is arranged outside the main see-through area (H) and the first reflective layer is adapted to reflect s-polarized light, at least in the projection area (B) and arranged in contact with the inner surface (3) of the inner glass plate (3) IV) Adjacent, a second reflective layer (7) adapted to reflect p-polarized light, arranged at least in the projection area (B) and between the outer glass plate (2) and the inner glass plate (3), an opaque shielding layer (5) is arranged outside the main see-through area (H) and is spatially arranged behind the second reflective layer (7) when viewed from the inside through the composite glass plate (1), and when viewed through the composite glass plate (1) When viewed vertically, the projection area (B) is completely located in the area of the composite glass plate (1) where the opaque shielding layer (5) is arranged.

Description

Composite glass panel with first reflective layer and second reflective layer

Technical field

The invention relates to a composite glass plate having a first reflective layer and a second reflective layer, a projection assembly and uses of the composite glass plate.

Background technique

Modern cars are increasingly equipped with so-called heads-up displays (HUD). Using a projector, usually in the dashboard area, the image is projected onto the windshield, where it is reflected and perceived by the driver as a virtual image behind the windshield (from his perspective). As a result, important data such as current driving speed, navigation or warning messages can be projected into the driver's field of vision, which he can perceive without having to take his eyes off the road. Head-up displays can therefore significantly improve traffic safety.

DE 10 2014 220 189 A1 discloses a head-up display projection assembly operated with p-polarized radiation, wherein the windscreen has a reflective structure that reflects the p-polarized radiation in the direction of the observer. US2004/0135742A1 also discloses a head-up display projection assembly using p-polarized radiation with a reflective structure. In WO 96/19347 A3 a multilayer polymer layer is proposed as a reflective structure.

WO 2022/073894A1 discloses a vehicle glass pane for a head-up display, which comprises at least one transparent glass pane, at least one masking strip in the edge region of the glass pane and at least one reflective layer for light reflection applied by printing , which is arranged in the area of the masking strip, towards the interior of the vehicle relative to the masking strip. A plurality of reflective layers may be provided, arranged such that a (partial) peripheral image is generated.

Stereoscopic imaging techniques can be used to generate two-dimensional images that convey an impression of space. This takes advantage of the different perspectives perceived by the observer's two eyes when viewing close objects. Stereoscopic images can also be artificially generated by photographing an object from two different viewpoints corresponding to the different perspectives of a pair of eyes, and then simultaneously displaying the captured image only to the observer's left or right eye, depending on the recording angle in each case. A two-dimensional image such that the corresponding eye cannot perceive the corresponding image of the other eye. As a result of binocular viewing from different viewing angles, observers gain depth perception despite using only two-dimensional images.

Head-up displays for stereoscopic information display are already known from DE 10 2009 054 232 A1, WO 2003 102 666 A1 and JP 2009 008 722A. DE 10 2016 205 700 A1 discloses a stereoscopic display device for vehicles. DE 10 2015 205 167 A1 describes a method for operating an autostereoscopic field display device of a vehicle, a corresponding control device and a corresponding computer program. DE 10 2019 218 627 A1 discloses an augmented reality head-up display suitable for displaying stereoscopic content. US2019/0204491A1 and CN 205899144U disclose three-dimensional head-up displays.

When designing a display based on head-up display technology, care must be taken that the image display device has a correspondingly high power, so that the projected image has sufficient brightness, especially in the case of incident sunlight, and is easy to be recognized by the observer. This requires an image display device of a certain size and is associated with corresponding power consumption.

Contents of the invention

There is a need for an improved composite glass plate for a projection assembly suitable for stereoscopic information display and through which the projection assembly has a good contrast ratio of an image (even an image produced with a backlight) and also has a low power consumption. It is an object of the present invention to provide such an improved composite glass pane, its use and an improved projection assembly with an improved composite glass pane.

According to the invention, this object is achieved by a composite glass pane according to claim 1, a projection assembly and use according to the accompanying claims. Preferred embodiments are apparent from the dependent claims.

A composite glass pane according to the present invention includes an outer glass pane, a thermoplastic intermediate layer, a first reflective layer, a second reflective layer, an opaque shielding layer and an inner glass pane.

Composite glass panels have a main see-through area and a projection area.

Composite glass panels are provided in vehicle window openings to isolate the interior from the external environment. In the context of the present invention, "inner glass pane" means the glass pane of the composite glass pane facing the interior of the vehicle. "Exterior glass pane" refers to the glass pane facing the external environment. The composite glass pane is preferably a windscreen for a vehicle (especially a windscreen for a motor vehicle, such as a passenger car or a truck).

A composite glass panel has an upper edge and a lower edge and two side edges extending between them. "Top edge" means the edge pointing upward in the installation position. "Lower edge" means the edge pointing downwards in the installation position. In the case of windshields, the upper edge is often called the "roof edge"; the lower edge is called the "engine edge."

The outer and inner glass panes have outer and inner surfaces, respectively, and peripheral side edges extending therebetween. In the context of the present invention, "outside surface" refers to the main surface facing the external environment in the installation position. In the context of the present invention, "inside surface" means the main surface facing inwards in the mounting position. The inner side surface of the outer glass pane and the outer side surface of the inner glass pane face each other and are joined to each other by a thermoplastic intermediate layer. Thus, the outside surface of the outer glass pane faces away from the thermoplastic intermediate layer, and the inside surface of the outer glass pane faces the thermoplastic intermediate layer. The outer surface of the inner glass pane faces the thermoplastic intermediate layer and the inner surface of the inner glass pane faces away from the thermoplastic intermediate layer.

The outside surface of the outer glass pane is called surface I. The inside surface of the outer glass pane is called surface II. The outside surface of the inner glass pane is called surface III. The inside surface of the inner glass pane is called surface IV.

According to the invention, the projection area is arranged outside the main see-through area. This means that the projected area and the main perspective area do not overlap each other. In a preferred embodiment, the main see-through area and the projection area are arranged at a distance from each other, ie in this embodiment the main see-through area and the projection area are not arranged adjacent to each other. In another embodiment, the projection area and the main see-through area are arranged adjacent to each other, ie in this embodiment the main see-through area and the projection area are arranged immediately adjacent to each other.

The first reflective layer is adapted to reflect s-polarized light. Therefore, the first reflective layer is an s-polarized light reflective layer. The first reflective layer is not a p-polarized light reflective layer. According to the invention, the first reflective layer is arranged adjacent to the inner surface of the inner glass pane and at least in the projection area.

The second reflective layer is adapted to reflect p-polarized light. Therefore, the second reflective layer is a p-polarized light reflective layer. The second reflective layer is not an s-polarized light reflective layer. According to the invention, the second reflective layer is arranged at least in the projection area and between the outer glass pane and the inner glass pane, ie between the outer glass pane and the thermoplastic intermediate layer or between the inner glass pane and the thermoplastic intermediate layer. between.

As mentioned above, both the first reflective layer and the second reflective layer are arranged at least in the projection area. Therefore, when viewed vertically through the composite glass pane, the first reflective layer and the second reflective layer completely overlap, at least in the projection area. The projection area does not have a section in which the first reflective layer is not arranged when viewed vertically through the composite glass pane, and also does not have a section in which the second reflective layer is not arranged when viewed vertically through the composite glass pane.

The first reflective layer preferably reflects at least 10%, particularly preferably at least 30%, of the s-polarized light incident on the first reflective layer. The s-polarized light has a wavelength range of 400 nm to 700 nm, preferably 450 nm to 650 nm, and an incident angle of 55°. to 75°. Particularly preferably, the first reflective layer reflects 50% or more, particularly preferably 80% or more, even more particularly preferably 90% or more, and especially 95% or more of the light incident on the first reflective layer. s-polarized light on the layer.

The second reflective layer preferably reflects at least 10%, particularly preferably at least 30%, of the p-polarized light incident on the second reflective layer, the p-polarized light having a wavelength range of 400 nm to 700 nm, preferably 450 nm to 650 nm, and an incident angle of 55°. to 75°. Particularly preferably, the second reflective layer reflects 50% or more, particularly preferably 80% or more, more particularly preferably 90% or more, and especially 95% or more incident on the second reflective layer. p-polarized light on the layer.

An opaque shielding layer is arranged outside the main see-through area and is spatially arranged behind the second reflective layer when viewed from the inside through the composite glass pane. Therefore, in the installed state of the composite glass pane according to the invention in a vehicle, the second reflective layer is located at a smaller distance from the interior of the vehicle than the opaque shielding layer.

Since according to the invention the first reflective layer is arranged adjacent to the inner side surface of the inner glass pane and the opaque shielding layer is arranged between the outer glass pane and the inner glass pane, the opaque shielding layer is also spatially arranged between the first reflective layer and the inner glass pane. behind the layer. Therefore, in the installed state of the composite glass pane according to the invention in a vehicle, the first reflective layer is located at a smaller distance from the interior of the vehicle than the opaque shielding layer.

Furthermore, since the first reflective layer is arranged adjacent to the inner side surface of the inner glass panel and the second reflective layer is arranged between the outer glass panel and the inner glass panel, in the installation state of the composite glass panel according to the present invention in the vehicle , the first reflective layer is closer to the interior of the vehicle than the second reflective layer.

Since the opaque shielding layer is arranged outside the main see-through area, the transparency of the composite glass sheet in the main see-through area is not affected by the opaque shielding layer.

According to the invention, when viewed vertically through the composite glass pane, the projected area is entirely located in the area of the composite glass pane in which the opaque masking layer is arranged. Thus, in a vertical view through the composite glass pane or in an orthogonal projection through the composite glass pane, the projected area is arranged to overlap the opaque masking layer. Therefore, the projected area has no segments that do not overlap with the opaque masking layer.

In a preferred embodiment of the composite glass pane according to the invention, the first reflective layer is arranged substantially over its entire surface adjacent to the inner surface of the inner glass pane. A “substantially full-surface arrangement” of the first reflective layer is understood to mean a full-surface arrangement or a full-surface arrangement minus a peripheral edge area having a width of, for example, 5 mm to 50 mm. The width of the peripheral edge area may be constant or variable.

In another preferred embodiment, the first reflective layer is arranged adjacent to the inner surface of the inner glass pane in an area that, when viewed vertically through the composite glass pane, is entirely located in the area where the opaque shielding layer is arranged middle. Particularly preferably, the first reflective layer is arranged only in the projection area.

In a preferred embodiment of the composite glass pane according to the invention, the second reflective layer is arranged substantially over the entire surface between the outer glass pane and the inner glass pane. A “substantially full-surface arrangement” of the second reflective layer is understood to mean a full-surface arrangement or a full-surface arrangement minus a peripheral edge area having a width of, for example, 5 mm to 50 mm. The width of the peripheral edge area may be constant or variable.

In another preferred embodiment, the second reflective layer is arranged between the outer glass pane and the inner glass pane in an area which, when viewed vertically through the composite glass pane, is entirely located in the area where the opaque shielding layer is arranged . Particularly preferably, the second reflective layer is arranged only in the projection area.

In a preferred embodiment, the first reflective layer and the second reflective layer completely overlap when viewed vertically through the composite glass sheet. In this embodiment, in a vertical view through the composite glass pane, the first reflective layer therefore has no sections that do not overlap with the second reflective layer, and the second reflective layer does not have sections that do not overlap with the first reflective layer. section. In this embodiment, the first reflective layer and the second reflective layer are thus arranged uniformly.

As mentioned above, the second reflective layer is arranged between the outer glass pane and the inner glass pane. In a preferred embodiment, the second reflective layer is arranged between the inner glass pane and the thermoplastic intermediate layer. In another preferred embodiment, the second reflective layer is arranged between the outer glass pane and the thermoplastic intermediate layer.

The first reflective layer is preferably embodied as a reflective coating or reflective film.

The second reflective layer is preferably embodied as a reflective coating or reflective film.

In the embodiment in which the second reflective layer is embodied as a reflective film and the second reflective layer is arranged between the inner glass pane and the thermoplastic intermediate layer, the composite glass pane preferably further comprises a first adhesive layer, said first adhesive layer The second reflective layer, which is arranged between the second reflective layer and the inner glass pane and is implemented as a reflective film, is bonded to the inner glass pane via a first adhesive layer.

In the embodiment in which the second reflective layer is embodied as a reflective film and is arranged between the outer glass pane and the thermoplastic intermediate layer, the composite glass pane preferably further comprises a first adhesive layer arranged The second reflective layer, which is between the second reflective layer and the outer glass pane and is implemented as a reflective film, is bonded to the outer glass pane by a first adhesive layer.

Preferably, the first adhesive layer is a thermoplastic polymer layer or optically clear adhesive (OCA).

In the embodiment in which the first reflective layer is implemented as a reflective film, the composite glass pane preferably further comprises a second adhesive layer, which is arranged between the first reflective layer and the inner glass pane and is implemented as a reflective film. The first reflective layer of the film is bonded to the inner glass pane via a second adhesive layer. In these embodiments, the first reflective layer is therefore preferably not arranged immediately adjacent the inner surface of the inner glass pane, but rather the second adhesive layer is arranged between the inner surface of the inner glass pane and the first reflective layer.

Preferably, the second adhesive layer is a thermoplastic polymer layer or optically clear adhesive (OCA).

Suitable optically clear adhesives (OCAs) are known to those skilled in the art.

The first adhesive layer or the second adhesive layer embodied as a thermoplastic polymer layer independently comprise at least one thermoplastic polymer, preferably ethylene vinyl acetate (EVA), polyvinyl butyral (PVB) or polyurethane. (PU) or mixtures or copolymers or derivatives thereof, PVB is particularly preferred. The thermoplastic polymer layer is usually formed from a thermoplastic film (bonding film). The thickness of the thermoplastic polymer layer is preferably from 0.2 mm to 2 mm, particularly preferably from 0.3 mm to 1 mm, for example 760 μm (microns). The thermoplastic polymer layer may be formed from a single film or from more than one film.

In a preferred embodiment, the second reflective layer is implemented as a reflective coating of the outer surface of the inner glass pane.

In another preferred embodiment, the second reflective layer is implemented as a reflective coating on the inner surface of the outer glass pane, provided that the opaque shielding layer is spatially arranged above the second reflective layer when viewed from the inside through the composite glass pane. behind.

The second reflective layer can also be embodied as a reflective coating of a thermoplastic intermediate layer.

The opaque masking layer is preferably a peripheral, ie frame-like, masking layer which is therefore arranged in the peripheral edge region. The peripheral opaque masking layer also serves as UV protection for the mounting adhesive of the composite glass panels.

Embodiments in which the projection area is arranged adjacent the lower edge of the composite glass pane are particularly preferred. In this case, the projection area can be arranged directly adjacent to the lower edge or indirectly adjacent to it. "Indirectly adjacent" is understood to mean that the projection area is not directly adjacent to the lower edge, but is arranged, for example, a few centimeters away from this edge, for example 1 cm to 10 cm, preferably 1 cm to 5 cm.

Since the projection area is entirely located in the region of the composite glass pane in which the opaque shielding layer is arranged when viewed vertically through the composite glass pane, the opaque shielding layer is also preferably arranged at least in the region adjacent to the lower edge of the composite glass pane.

In a preferred embodiment of the composite glass pane according to the invention, the opaque screening layer is arranged at least partially in the peripheral edge area and, in particular, in a section overlapping the projection area, said opaque screening layer has a ratio of A larger width in a different section than this section.

In the context of the present invention, an opaque masking layer is a layer that prevents penetration through a composite glass pane. The transmission of light of the visible spectrum through the opaque shielding layer is at most 10%, preferably at most 5%, particularly preferably at most 2%, more particularly preferably at most 1%, especially at most 0.1%. The opaque shielding layer is preferably black.

The opaque masking layer is preferably a coating consisting of one or more layers. However, as an alternative it can also be an opaque element, such as a film, inserted into the composite glass pane. According to a preferred embodiment of the composite glass pane, the opaque masking layer consists of a single layer. This has the advantage of particularly simple and economical production of composite glass panes, since only a single layer has to be formed for the opaque masking layer.

The opaque masking layer is in particular an opaque cover print made of dark, preferably black, enamel.

An opaque masking layer implemented as an opaque cover print can be formed over the entire surface. The cover print can also be translucent at least in sections, for example as a grid of dots, strips or squares. Alternatively, the overlay print may also have a gradient, for example from an opaque to a translucent overlay. Preferably, the masking layer embodied as an opaque cover print is formed over the entire surface, at least in the projection area.

In a preferred embodiment, the opaque masking layer is implemented as an opaque cover print on the inside surface of the outer glass pane.

In another embodiment, the opaque masking layer is implemented as an opaque colored area of the thermoplastic interlayer.

In one embodiment, the composite glass pane has an integrally formed and opaquely colored thermoplastic interlayer in one area.

Opaque masking layers implemented as opaque colored areas of a thermoplastic interlayer can also be achieved by using a thermoplastic interlayer assembled from an opaque thermoplastic film and a transparent thermoplastic film. The opaque thermoplastic film and the transparent thermoplastic film are preferably arranged offset from each other so that the two films do not overlap when viewed through the composite glass pane. The transparent film and the opaque film are made of, or preferably contain, the same plastic. Materials from which both opaque and transparent films can be formed are those also described for the thermoplastic interlayer. The opaque film is preferably a tinted film, which may be of different colours, in particular black.

From the perspective of a vehicle occupant, the first reflective layer and the second reflective layer are arranged in the projection area and spatially in front of the opaque shielding layer when viewed through the composite glass pane. The first reflective layer and the second reflective layer appear opaque in areas of the composite glass sheet spatially disposed in front of the opaque masking layer. The first reflective layer is a transparent reflective layer. The second reflective layer is preferably transparent in the area in front of the opaque masking layer; however, it may itself be opaque. It goes without saying that in the embodiment in which the second reflective layer is opaque, on the composite glass plate, only the area where the second reflective layer is arranged, when viewed vertically through the composite glass plate, is entirely located where the opaque shielding layer is arranged area so that the transparency of the composite glass sheet in the main see-through area is not affected by the opaque second reflective layer.

The expression "when looking through the composite glass pane" means that the observer is looking through the composite glass pane from the inside, ie the inside surface of the inner glass pane is the surface of the inner glass pane closest to the observer. When composite glass panels are installed in a vehicle, "interior" refers to the interior of the vehicle. In the context of the present invention, "spatially in front" means that one layer is arranged spatially farther from the outer surface of the outer glass pane than the other layer.

The composite glass pane may further comprise a coating which is implemented as a protective coating and/or an antifouling layer and/or a waterproofing layer and is arranged on a surface of the first reflective layer facing away from the inner glass pane.

Suitable protective coatings and/or antifouling and/or waterproofing layers are known to those skilled in the art.

The additional coating is preferably embodied as a hydrophobic film and advantageously protects the first reflective layer from external influences, in particular contamination. Hydrophobic films are coatings that are highly resistant to the deposition of liquids, salts, grease and dirt, for example, and are advantageously particularly easy to clean. For example, fingerprints due to the user's touch can be avoided. Suitable hydrophobic membranes and their design and production are described, for example, in WO2005/084943, WO2007/012779 or WO2010/079299. Such hydrophobic coatings are already applied and used, for example, on the outer surfaces of exterior glass panels of vehicles. In this use, this hydrophobic membrane has good durability for two or more years. Thanks to the hydrophobic coating, water droplets slide off the glass easily, giving the driver a better view through the windshield when it rains. Advantageously, the use of a hydrophobic film on the surface of the first reflective layer of the composite glass pane facing away from the inner glass pane provides that the film is not directly exposed to erosion or friction from the windscreen wipers and therefore has extended durability.

In the context of the present invention, "hydrophobicity" means that the film has certain wetting properties, i.e. the contact angle of water with the surface is greater than 90°. Preferably, the hydrophobic film is also oleophobic, ie the contact angle between the surface and oil is greater than 50°. The hydrophobic film is advantageously transparent and in no way impairs the view through the glazing or channel, or the perceptibility of radiated light (eg reflected light).

In a preferred embodiment, a hydrophobic membrane is provided with a contact angle to water of >100°, preferably >110°. Such a hydrophobic film ensures particularly good anti-fouling and water-repellent properties of the surface and correspondingly reduces the frequency of cleaning. Such membranes are in particular fluorine-containing organic compounds, such as those also described in DE 198 48 591. Such hydrophobic membranes are, for example, products based on perfluoropolyethers or fluorosilanes. These are, for example, layers applied in liquid form, for example by spraying, dip and flow coating or using cloth. As an alternative, the hydrophobic membrane can be obtained as a nanolayer system, applied for example by chemical or physical vapor deposition.

In one embodiment of the composite glass pane according to the invention, a coating embodied as an antifouling layer and/or a waterproofing layer is provided, said coating being applied on a surface of the first reflective layer facing away from the inner glass pane, and, Furthermore, it is applied to the areas of the inner surface of the inner glass pane which are not covered by the first reflective layer. In other words, the coating forms a seal over the entire inside surface of the composite glass pane and towards the interior (eg, vehicle interior). This has the advantage that the protective and/or anti-fouling and/or water-repellent properties of the coating can also be provided over the entire surface. Furthermore, the production of this inward-facing full-surface seal is simple, efficient and cost-effective to implement.

A composite glass pane according to the invention may optionally have an additional opaque cover print on the inside surface of the outer glass pane, on the outside surface of the inner glass pane or on the inside surface of the inner glass pane, provided that the additional opaque cover print is arranged on the main In areas outside the perspective area and outside the projection area.

The additional opaque cover print is preferably arranged on the inner surface of the inner glass pane, in particular in the peripheral edge region. Preferably, in this embodiment, no first reflective layer is arranged in the area where the additional opaque cover print is arranged on the inner surface of the inner glass pane. The opaque cover print arranged on the inner surface of the inner glass pane has a favorable effect on the bonding properties with respect to the mounting adhesive of the composite glass pane with which the composite glass pane can be bonded to the vehicle.

An opaque overprint is attached, in particular an overprint of a dark (preferably black) enamel.

Suitable first reflective layers that reflect s-polarized light and suitable second reflective layers that reflect p-polarized light are known to those skilled in the art.

The first reflective layer and/or the second reflective layer preferably comprise a group selected from the group consisting of aluminum, tin, titanium, copper, chromium, cobalt, iron, manganese, zirconium, cerium, yttrium, silver, gold, platinum and palladium or mixtures thereof at least one metal in .

In a preferred embodiment of the invention, the first reflective layer and/or the second reflective layer is a reflective coating comprising a stack of thin films, ie a layer sequence of thin single layers. The thin film stack contains one or more silver-based conductive layers. The silver-based conductive layer gives the reflective coating basic reflective properties as well as infrared reflection effect and conductivity. The conductive layer is silver-based. The conductive layer preferably contains at least 90% by weight of silver, particularly preferably at least 99% by weight of silver, more particularly preferably at least 99.9% by weight of silver. The silver layer may have doping such as palladium, gold, copper or aluminum. Silver-based materials are particularly suitable for reflecting p-polarized light. The thickness of the coating is from 5 μm to 50 μm, preferably from 8 μm to 25 μm.

The first reflective layer may also be implemented as a coated or uncoated reflective film that reflects s-polarized light.

The second reflective layer may also be implemented as a coated or uncoated reflective film that reflects p-polarized light.

The first reflective layer and/or the second reflective layer may be a carrier film with a reflective coating or an uncoated reflective polymer film. The reflective coating preferably includes at least one layer based on a sequence of metallic and/or dielectric layers with alternating refractive indices. The metal-based layer preferably contains or consists of silver and/or aluminum. The dielectric layer may be based, for example, on silicon nitride, zinc oxide, tin zinc oxide, mixed silicon-metal nitrides such as zirconium silicon nitride, zirconium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide or silicon carbide. The above-mentioned oxides and nitrides can be deposited in stoichiometric, substoichiometric or superstoichiometric quantities. They can have dopings such as aluminum, zirconium, titanium or boron. The uncoated reflective polymer film preferably includes or consists of a dielectric polymer layer. The dielectric polymer layer preferably contains polyethylene terephthalate (PET). If the first reflective layer and/or the second reflective layer is embodied as a reflective film, it is preferably 30 μm to 300 μm thick, particularly preferably 50 μm to 200 μm thick, and in particular 100 μm to 150 μm thick.

If the first reflective layer and/or the second reflective layer is embodied as a reflective coating, this is preferably by physical vapor deposition (PVD), particularly preferably by cathode sputtering (“sputtering”), and even more particularly preferably, The surface to be coated is applied by magnetron-enhanced cathode sputtering ("magnetron sputtering"). In principle, however, the coating can also be applied, for example by chemical vapor deposition (CVD), plasma enhanced vapor deposition (PECVD), vapor deposition or atomic layer deposition (ALD).

If the first reflective layer and/or the second reflective layer is a coated reflective film, the coating method CVD or PVD can also be used for production.

According to another preferred embodiment of the composite glass pane of the invention, the second reflective layer is embodied as a coated reflective carrier film or an uncoated polymer film and is preferably arranged between the thermoplastic intermediate layer and the first adhesive layer between. The advantage of this arrangement is that the second reflective layer does not have to be applied to the outer or inner glass pane by means of thin film technologies such as CVD and PVD. This gives the use of a second reflective layer a further advantageous function, such as a more uniform reflection of light on the second reflective layer.

In one embodiment of the composite glass pane according to the invention, the first reflective layer is implemented as a coated reflective carrier film or an uncoated polymer film and is preferably bonded to the inner glass pane by a second adhesive layer the inner surface of.

The second reflective layer can also be embodied as a polyethylene terephthalate (PET)-based film coated with a copolymer layer stack based on PET and/or polyethylene naphthalate (PEN) . The coating is preferably applied on the inner surface, ie the surface facing the interior of the vehicle. Suitable reflective films are described for example in US 5882774A.

When a layer is based on a material, said layer consists mostly of that material, in particular essentially apart from any impurities or dopings. The above-mentioned oxides and nitrides may be deposited stoichiometrically, substoichiometrically, or superstoichiometrically (even though for better understanding, stoichiometric chemical formulas are indicated). They can have dopings such as aluminum, zirconium, titanium or boron.

The outer and inner glass panes are preferably made of glass, especially soda-lime glass, which is customary for window glass panes. In principle, however, the glass pane can also be made of other types of glass (e.g. borosilicate glass, quartz glass, aluminosilicate glass) or transparent plastics (e.g. polymethylmethacrylate or polycarbonate) become. The thickness of the outer and inner glass panes can vary widely. It is preferred to use glass plates with a thickness in the range of 0.8 mm to 5 mm, preferably in the range of 1.4 mm to 2.5 mm, for example a standard thickness of 1.6 mm or 2.1 mm.

In a preferred embodiment, the thickness of the inner glass pane is at most 1.6 mm, particularly preferably at most 1.4 mm, more particularly preferably at most 1.1 mm.

The outer glass pane, inner glass pane and thermoplastic interlayer may be clear and colorless, or tinted or tinted. In a preferred embodiment, the composite glass sheet (including the reflective coating) has a total transmittance greater than 70% in the main see-through area (illuminator A). The term "total transmittance" is based on the motor vehicle window transmittance test process specified in ECE-R 43 Appendix 3 §9.1. The outer glass pane and the inner glass pane can be non-prestressed, partially prestressed or prestressed independently of each other. If at least one of the glass panes is to be prestressed, this can be thermal or chemical prestressing.

Preferably, the inner glass pane is not tinted or colored.

The composite glass pane is preferably curved in one or more spatial directions, as is customary for motor vehicle glass panes, with typical radii of curvature ranging from about 10 cm to about 40 m. However, the composite glass pane can also be flat, for example when it is to be used as a glass pane for buses, trains or tractors.

The thermoplastic intermediate layer contains at least one thermoplastic polymer, preferably ethylene vinyl acetate (EVA), polyvinyl butyral (PVB) or polyurethane (PU) or mixtures or copolymers or derivatives thereof, particularly preferably PVB. The thickness of the intermediate layer is preferably 0.2 mm to 2 mm, particularly preferably 0.3 mm to 1 mm. The thermoplastic interlayer may also be a film with functional properties, such as a film with acoustic damping properties. Preferably, the thermoplastic intermediate layer has a constant thickness, apart from any surface roughness common in the industry, i.e. it does not have a wedge-shaped cross-section.

The thermoplastic interlayer may be formed from a single film or even from more than one film.

The composite glass sheet according to the invention can be produced according to a method comprising at least:

a) providing a stack sequence having a projection area and a main see-through area, said stack sequence including an outer glass pane, an inner glass pane, a thermoplastic intermediate layer, an opaque masking layer, a first reflective layer and a second reflective layer,

wherein the outer glass plate has an outer surface facing away from the thermoplastic intermediate layer and an inner surface facing the intermediate layer, and the inner glass plate has an outer surface facing the thermoplastic intermediate layer and facing away from the thermoplastic intermediate layer the inner surface of

the projection area is arranged outside the main perspective area,

said first reflective layer adapted to reflect s-polarized light, arranged at least in said projection area and adjacent said inner side surface of said inner glass pane,

The second reflective layer is adapted to reflect p-polarized light, is arranged at least in the projection area, and is arranged between the outer glass pane and the thermoplastic interlayer or between the thermoplastic interlayer and the inner glass pane. between,

the opaque masking layer is disposed outside the main see-through area and spatially disposed behind the second reflective layer when viewed from the inside through the composite glass pane, and

When viewed vertically through the composite glass sheet, the projection area is entirely located in the area of the composite glass sheet where the opaque masking layer is disposed.

b) Joining the sequence of stacks by lamination to form a composite glass pane having a projection area and a main see-through area.

The invention also relates to a projection assembly comprising a composite glass pane according to the invention and at least one image display device. The at least one image display device is directed toward the projection area and is arranged such that the inside surface of the inner glass pane is the surface of the inner glass pane closest to the image display device. The angle of incidence of the light emitted by the at least one image display device is preferably 55° to 80°, particularly preferably 62° to 77°.

Therefore, the present invention also relates to a projection assembly, which at least includes:

- A composite glass panel having a projection area and a main see-through area, the composite glass panel comprising at least: an outer glass plate, an inner glass plate, a thermoplastic intermediate layer, an opaque shielding layer, a first reflective layer and a second reflective layer, wherein The outer glass pane has an outside surface facing away from the thermoplastic interlayer and an inside surface facing the thermoplastic interlayer, and the inner glass pane has an outside surface facing the thermoplastic interlayer and an inside surface facing away from the thermoplastic interlayer. surface, the projection area being arranged outside the main see-through area, the first reflective layer being adapted to reflect s-polarized light, being arranged at least in the projection area and being arranged in contact with the inner glass plate Adjacent to the inner surface, the second reflective layer is adapted to reflect p-polarized light, is arranged at least in the projection area, and is arranged between the outer glass pane and the thermoplastic intermediate layer or between the thermoplastic intermediate layer and between said inner glass panes, said opaque shielding layer being disposed outside said primary see-through area and spatially disposed behind said second reflective layer when viewed from the inside through said composite glass panes, and when viewed vertically through the composite glass sheet, the projection area is entirely located in the area of the composite glass sheet where the opaque shielding layer is disposed,

as well as

- at least one image display device directed towards the projection area and arranged such that the inner surface of the inner glass pane is the surface of the inner glass pane closest to the image display device.

In one embodiment, the projection assembly has exactly one image display device which emits s-polarized light and p-polarized light alternately. This can be achieved, for example, by an image display device having a circular rotating aperture. The light cones of the emitted s-polarized light and the light cones of the emitted p-polarized light are slightly offset spatially, for example, 1 mm to 2 mm from each other. The s-polarized light emitted from the image display device is reflected by the first reflective layer, and the p-polarized light emitted from the image display device is reflected by the second reflective layer.

The image emitted by the image display device using s-polarized light is different from the image emitted by the image display device using p-polarized light. In particular, one image corresponds to the image for the right eye and the other image corresponds to the image for the left eye. Therefore, different content is displayed for the observer's right and left eyes. An image emitted with s-polarized light by the image display device and an image emitted with p-polarized light by the image display device are implemented, and corresponding projected virtual images are arranged relative to each other so that there is a stereoscopic virtual image for the observer.

In particular, in this embodiment, the difference between an image emitted with s-polarized light by the image display device and an image emitted with p-polarized light by the image display device is that the images are recorded from different viewing angles.

Optionally, in this embodiment, the projection assembly may further include a camera and a control element, the camera is used to determine the position of the observer's right eye and left eye, and the control element is used to determine the position of the observer based on the measured eye position. The incident angle of s-polarized light emitted by the image display device and/or the incident angle of p-polarized light emitted by the image display device is controlled.

In an alternative embodiment of the projection assembly according to the invention, the projection assembly has two image display means, one of which emits s-polarized light and the other which emits p-polarized light.

An image emitted by an image display device that emits s-polarized light is different from an image emitted by an image display device that emits p-polarized light. In particular, one image corresponds to the image for the right eye and the other image corresponds to the image for the left eye. Therefore, different content is displayed for the observer's right and left eyes. An image emitted with s-polarized light by one image display device and an image emitted with p-polarized light by another image display device are implemented, and corresponding projected virtual images are arranged relative to each other so that there is a stereoscopic virtual image for the observer.

In particular, in this embodiment, the difference between an image emitted with s-polarized light by one image display device and an image emitted with p-polarized light by another image display device is that the images are recorded from different viewing angles.

Optionally, in this embodiment, the projection assembly may also include a camera and a control element, the camera is used to determine the position of the observer's right eye and left eye, and the control element is used to determine the position of the observer's right eye and left eye according to the measured position of the eye. To control the incident angle of s-polarized light emitted by one image display device and/or the incident angle of p-polarized light emitted by another image display device.

In an embodiment of the projection assembly according to the invention, in which, in the composite glass pane, the first reflective layer also extends over the main see-through area, the projection assembly may have additional image display means from The interior is directed towards the main see-through area and emits s-polarized light which is reflected by the first reflective layer also arranged in the main see-through area.

In an embodiment of the projection assembly according to the invention, in which, in the composite glass pane, the second reflective layer also extends over the main see-through area, the projection assembly can also have additional image display means, said additional image display means It is directed from the inside towards the main see-through area and emits p-polarized light which is reflected by a second reflective layer also arranged in the main see-through area.

Suitable image display devices are known to those skilled in the art.

According to a preferred embodiment of the projection assembly according to the invention, the at least one image display device (which can for example be a projector or preferably a display) can be implemented independently of each other as a liquid crystal display (LCD), a thin film transistor (TFT) display, a luminescent Diode (LED) displays, organic light-emitting diode (OLED) displays, electroluminescence (EL) displays, micro-LED displays, etc., preferably LCD displays.

The above-described preferred embodiments of a composite glass pane according to the invention also apply mutatis mutandis to a projection assembly according to the invention, and vice versa, said projection assembly comprising a composite glass pane according to the invention and at least one image display device .

The term "p-polarized light" refers to light of the visible spectrum having p-polarization. The indication of polarization direction is based on the plane of incidence of the radiation on the composite glass plate. P-polarized radiation is radiation whose electric field oscillates in the plane of incidence. S-polarized radiation is radiation whose electric field oscillates perpendicular to the plane of incidence. The plane of incidence is generated from the incident vector and the surface normal of the composite glass plate at the geometric center of the illuminated area. In other words, the polarization, ie, in particular, the ratio of p-polarized radiation to s-polarized radiation, is determined at one point of the area illuminated by the light source, preferably at the geometric center of the illuminated area. Since composite glass panes can be curved (for example, when they are implemented as windshields), this affects the plane of incidence of the radiation, so that in the remaining areas polarization ratios may appear slightly deviating from them, which for physical reasons cannot Avoided.

In the context of this application, "projection area" means the area that can be illuminated by the at least one image display device during the use of a composite glass pane in a projection assembly comprising the composite glass pane and the at least one image display device. The area that the driver or observer of the vehicle sees primarily through the composite glass pane is referred to in the context of this application as the "main see-through area".

In the context of the present invention, "transparent" means that the total transmittance of the composite glass pane complies with the legal requirements for windshields and preferably, for visible light, the transmittance is greater than 50%, in particular greater than 60%, for example greater than 70% . Correspondingly, "opaque" means that the light transmission is less than 10%, preferably less than 5%, especially 0%.

The invention also encompasses the use of a composite glass pane according to the invention as a vehicle glazing pane in a mobile device traveling on land, air or water, in particular in a motor vehicle, in particular as a windshield for a head-up display.

Description of drawings

The invention is explained in more detail with reference to the drawings and exemplary embodiments. The drawings are schematic and not drawn to scale. The drawings in no way limit the invention. They describe:

Figure 1 is a plan view of one embodiment of a composite glass panel according to the present invention,

Figure 2 is a cross-section through the embodiment shown in Figure 1,

Figures 3 to 19 are cross-sections in each case through further embodiments of composite glass panes according to the invention,

Figure 20 is a cross-section through one embodiment of a projection assembly according to the present invention,

Figure 21 is an enlarged detail of a cross-section through the embodiment of the projection assembly according to the invention shown in Figure 20,

Figure 22 is a cross-section through one embodiment of a projection assembly according to the present invention, and

Figure 23 is an enlarged detail of a cross-section through the embodiment of the projection assembly according to the invention shown in Figure 22.

Detailed ways

Figure 1 shows a plan view of an embodiment of a composite glass pane 1 according to the invention, and Figure 2 shows a cross section through the composite glass pane 1 shown in Figure 1 along the section line XX'. The composite glass panel 1 shown in Figures 1 and 2 has an upper edge O, a lower edge U and two side edges K. Furthermore, FIG. 1 shows the main perspective area H and the projection area B of the composite glass panel 1 . The composite glass plate 1 shown in Figures 1 and 2 includes an outer glass plate 2 with an outer surface I and an inner surface II, an inner glass plate 3 with an outer surface III and an inner surface IV, a thermoplastic intermediate layer 4, and an opaque shielding layer 5 , the first reflective layer 6 and the second reflective layer 7 . The thermoplastic intermediate layer 4 is arranged between the outer glass pane 2 and the inner glass pane 3 , the outer surface I of the outer glass pane 2 facing away from the thermoplastic intermediate layer 4 , the inner surface II of the outer glass pane 2 facing the thermoplastic intermediate layer 4 , the inner glass pane 3 The outer surface III of the inner glass pane 3 faces the thermoplastic intermediate layer 4 and the inner surface IV of the inner glass pane 3 faces away from the thermoplastic intermediate layer 4 . The outer glass pane 2, the thermoplastic intermediate layer 4, the first reflective layer 6, the second reflective layer 7 and the inner glass pane 3 are atop one another over the entire surface. The projection area B is arranged outside the main perspective area H. In the embodiment shown in Figures 1 and 2, the projection area B is arranged adjacent to the lower edge U. The opaque shielding layer 5 is arranged between the outer glass pane 2 and the inner glass pane 3 at least in the projection area B and is opaque when viewed through the composite glass pane 1 from the inside, that is starting from the inner surface IV of the inner glass pane 3 The shielding layer 5 is arranged spatially behind the first reflective layer 6 and spatially behind the second reflective layer 7 . In the embodiment shown in FIGS. 1 and 2 , the opaque masking layer 5 is embodied as an opaque cover print arranged on the inner surface II of the outer glass pane 2 and in the peripheral edge region, said opaque masking layer being in contact with the projection Area B has a greater width in a section overlapping it than in a section different from this section. When viewed vertically through the composite glass panel 1 , the projection area B is entirely located in the area of the composite glass panel 1 where the opaque shielding layer is disposed.

The thermoplastic interlayer 4 is, for example, an interlayer made of PVB and has a thickness of 0.76 mm. Apart from any roughness common in the trade, the thermoplastic interlayer 4 has a substantially constant thickness - it does not implement a so-called "wedge film".

The outer glass pane 2 and the inner glass pane 3 are made, for example, of soda-lime glass. The outer glass pane 2 has a thickness of, for example, 2.1 mm; the inner glass pane 3 has a thickness of, for example, 1.6 mm or 1.1 mm.

In the embodiment shown in FIGS. 1 and 2 , the first reflective layer 6 is arranged on the inner surface IV of the inner glass pane 3 and the second reflective layer 7 is arranged between the inner glass pane 3 and the thermoplastic intermediate layer 4 . The first reflective layer 6 is adapted to reflect s-polarized radiation. The second reflective layer 7 is adapted to reflect p-polarized radiation.

In the embodiment shown in FIGS. 1 and 2 , the first reflective layer 6 is embodied, for example, as a coating arranged on the inner surface IV of the inner glass pane 3 , and is embodied, for example, as a film containing at least one silver-based conductive layer. Stacked body.

In the embodiment shown in FIGS. 1 and 2 , the second reflective layer 7 is embodied, for example, as a coating arranged on the outer surface III of the inner glass pane 3 , and is embodied, for example, as comprising at least one silver-based conductive layer and one Thin film stack with a sequence of dielectric layers of alternating refractive index.

Figure 3 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 3 differs from the embodiment shown in FIG. 2 only in that the first reflective layer 6 and the second reflective layer 7 are only arranged in the projection area. In this embodiment, the second reflective layer 7 can be implemented as a coating of the outer surface III of the inner glass pane 3 or as a reflective film arranged immediately adjacent to the inner glass pane 3 .

Figure 4 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 4 differs from that shown in FIG. 2 in that a second adhesive layer 9 is arranged between the first reflective layer 6 and the inner glass pane 3 . The second adhesive layer 9 is, for example, an optically clear adhesive. In the embodiment shown in FIG. 4 , the first reflective layer 6 is, for example, a reflective film.

Figure 5 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 5 differs from the embodiment shown in FIG. 4 only in that the first reflective layer 6 and the second reflective layer 7 are only arranged in the projection area. In this embodiment, the second reflective layer 7 can be implemented as a coating of the outer surface III of the inner glass pane 3 or as a reflective film arranged immediately adjacent to the inner glass pane 3 .

Figure 6 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The only difference between the embodiment shown in Figure 6 and the embodiment shown in Figure 2 is that the second reflective layer 7 is not arranged between the inner glass plate 3 and the thermoplastic intermediate layer 4, but is arranged between the thermoplastic intermediate layer 4 and the outer thermoplastic intermediate layer 4. Between the glass plates 2 , an opaque shielding layer 5 is arranged behind the second reflective layer 7 , provided that it is viewed from the inside. Therefore, it goes without saying that the second reflective layer 7 is applied to the opaque shielding layer 5 in the area of the inner surface II of the outer glass pane 2 to which the opaque shielding layer 5 is applied.

Figure 7 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 7 differs from the embodiment shown in FIG. 6 only in that the first reflective layer 6 and the second reflective layer 7 are only arranged in the projection area. In this embodiment, the second reflective layer 7 can be implemented as a coating of the inner surface II of the outer glass pane 2 or as a reflective film arranged adjacent to the outer glass pane 2 .

It goes without saying that the second reflective layer 7 is applied to the opaque screening layer 5 in the area of the inner surface II of the outer glass pane 2 .

Figure 8 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in Figure 8 differs from the embodiment shown in Figure 2 in that a first adhesive layer 8 is arranged between the second reflective layer 7 and the inner glass plate 3, the first adhesive layer 8 being, for example, an optical fiber Transparent adhesive. In the embodiment shown in FIG. 8 , the second reflective layer 7 is, for example, a reflective film.

Figure 9 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in Figure 9 differs from the embodiment shown in Figure 3 in that a first adhesive layer 8 is arranged between the second reflective layer 7 and the inner glass plate 3. The first adhesive layer 8 is, for example, an optical fiber. Clear adhesive.

Figure 10 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 10 differs from the embodiment shown in FIG. 2 in that the opaque masking layer 5 is not implemented as an opaque cover print on the inner surface II of the outer glass pane 2 but is implemented as an opaque thermoplastic intermediate layer 3 Colored area.

In the area adjacent to the upper edge O, the thermoplastic intermediate layer 3 can also, as an alternative, not have a tint, and optionally an opaque cover print can be applied to the inner surface II of the outer glass pane 2, to the inner glass The outer surface III of the plate 3 or the inner surface IV of the inner glass plate 3 is applied.

Figure 11 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 11 differs from the embodiment shown in FIG. 10 only in that the first reflective layer 6 and the second reflective layer 7 are only arranged in the projection area. In this embodiment, the second reflective layer 7 can be implemented as a coating of the outer surface III of the inner glass pane 3 or as a reflective film arranged immediately adjacent to the inner glass pane 3 .

Figure 12 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 12 differs from the embodiment shown in FIG. 8 in that the opaque masking layer 5 is not implemented as an opaque cover print on the inner surface II of the outer glass pane 2 but is implemented as an opaque thermoplastic intermediate layer 3 Colored area.

In the area adjacent to the upper edge O, the thermoplastic intermediate layer 3 can also, as an alternative, not have a tint, and optionally an opaque cover print can be applied to the inner surface II of the outer glass pane 2, to the inner glass The outer surface III of the plate 3 or the inner surface IV of the inner glass plate 3 is applied.

Figure 13 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 13 differs from the embodiment shown in FIG. 12 only in that the second reflective layer 7 is only arranged in the projection area B. As shown in FIG. In this embodiment, the second reflective layer 7 is implemented as a reflective film, for example. In this embodiment, the first adhesive layer 8 is a thermoplastic polymer layer.

Figure 14 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 14 differs from the embodiment shown in FIG. 2 in that a surface embodied as a protective coating or an antifouling and/or waterproofing layer is arranged on the surface of the first reflective layer 6 facing away from the inner glass pane 3 . Coating 10. The coating 10 is implemented, for example, as a hydrophobic coating.

It goes without saying that in the embodiments of composite glass panes according to the invention shown in FIGS. 3 to 13 , in each case optionally on the surface of the first reflective layer 6 facing away from the inner glass pane 3 A coating 10 implemented as a protective coating or an antifouling and/or water-repellent layer may be provided. In an embodiment in which the first reflective layer 6 is arranged only in the projection area B, the coating 10 can be applied only to the surface of the first reflective layer 6 facing away from the inner glass pane 3 or, alternatively, both to the first reflective layer 6 and to the first reflective layer 6 . On the surface of the reflective layer 6 facing away from the inner glass pane 3 , the reflective layer 6 is in turn applied to the area of the inner surface IV of the inner glass pane 3 in which the first reflective layer 6 is not arranged.

Figure 15 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in Figure 15 differs from the embodiment shown in Figure 2 in that no first reflective layer 6 is arranged in a peripheral edge area of, for example, 2 cm on the inner surface IV of the inner glass plate 3, and in this An additional opaque cover print 11 , for example of black enamel, is applied in the peripheral edge area. This additional opaque cover print 11 is arranged outside the main see-through area H and projection area B.

Figure 16 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in FIG. 16 differs from the embodiment shown in FIG. 3 in that no first reflective layer 6 is arranged in a peripheral edge area of, for example, 2 cm on the inner surface IV of the inner glass plate 3, and in this An additional opaque cover print 11 , for example of black enamel, is applied in the peripheral edge area. This additional opaque cover print 11 is arranged outside the main see-through area H and projection area B.

Figure 17 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The embodiment shown in Figure 17 differs from the embodiment shown in Figure 6 in that no first reflective layer 6 is arranged in a peripheral edge area of, for example, 2 cm, on the inner surface IV of the inner glass plate 3, and in this An additional opaque cover print 11 , for example of black enamel, is applied in the peripheral edge area. This additional opaque cover print 11 is arranged outside the main see-through area H and projection area B.

It goes without saying that in the embodiments shown in Figures 4, 5 and 7 to 14, it is optionally possible to apply in a peripheral edge area of, for example, 2 cm on the inner surface IV of the inner glass plate, For example, the additional opaque cover print 11 of black enamel is arranged outside the main see-through area H and the projection area B. In the area where the additional opaque cover print 11 is applied, neither the first reflective layer 6 nor the second adhesive layer 9 is arranged.

Figure 18 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The difference between the embodiment shown in Fig. 18 and the embodiment shown in Fig. 15 is that the second reflective layer 7 is not arranged on the entire surface, but only in the projection area B.

Figure 19 shows a cross-section through another embodiment of a composite glass pane 1 according to the invention. The difference between the embodiment shown in Fig. 19 and the embodiment shown in Fig. 15 is that the first reflective layer 6 is not arranged on the entire surface, but only in the projection area B.

Similarly, in the embodiments shown in Figures 2, 4, 6, 8, 10, 12, 14 and 17, optionally, the first reflective layer 6 or the second reflective layer 7 can Arranged only in projection area B.

Figure 20 shows a cross-section through one embodiment of a projection assembly 100 according to the invention, and Figure 21 shows an enlarged detail of the cross-section through the embodiment shown in Figure 20. The projection assembly 100 shown in Figures 20 and 21 includes a composite glass plate 1 and an image display device 12 according to the present invention. In the embodiment shown in FIGS. 20 and 21 , the composite glass pane 1 according to the invention is implemented as shown in FIG. 2 . As an alternative, the composite glass pane 1 may, for example, also be embodied as shown in FIGS. 3 to 19 . The image display device 12 is directed toward the projection area B and is arranged so that the inner side surface IV of the inner glass plate 3 is the surface of the inner glass plate 3 closest to the image display device 12 . The image display device 12 is, for example, a TFT display.

In the embodiment shown in FIGS. 20 and 21 , the image display device 12 has a circular rotating aperture and alternately emits s-polarized light and p-polarized light. The light cones of the emitted s-polarized light and the light cones of the emitted p-polarized light are spatially 1 mm to 2 mm apart from each other. The s-polarized light emitted by the image display device 12 is reflected by the first reflective layer 6 , and the p-polarized light emitted by the image display device 12 is reflected by the second reflective layer 7 .

The image emitted by the image display device 12 using s-polarized light is different from the image emitted by the image display device 12 using p-polarized light. For example, one image corresponds to an image for the right eye and another image corresponds to an image for the left eye, or vice versa. Therefore, different content is displayed for the observer's right and left eyes. The image emitted with s-polarized light by the image display device 12 and the image emitted with p-polarized light by the image display device 12 are implemented, and the corresponding projected virtual images are arranged relative to each other so that there is a stereoscopic virtual image for the observer.

Figure 22 shows a cross-section through one embodiment of a projection assembly 100 according to the invention, and Figure 23 shows an enlarged detail of the cross-section through the embodiment shown in Figure 22. The projection assembly 100 shown in Figures 22 and 23 includes a composite glass plate 1 according to the present invention and two image display devices 12. In the embodiment shown in Figures 22 and 23, the composite glass pane 1 according to the invention is implemented as shown in Figure 2. As an alternative, the composite glass pane 1 may, for example, also be embodied as shown in FIGS. 3 to 19 . The image display device 12 is directed toward the projection area B and is arranged so that the inner side surface IV of the inner glass plate 3 is the surface of the inner glass plate 3 closest to the image display device 12 . The image display device 12 is, for example, a TFT display.

In the embodiment shown in FIGS. 22 and 23 , one image display device 13 emits s-polarized light, and the other image display device 14 emits p-polarized light. The light cones of the emitted s-polarized light and the light cones of the emitted p-polarized light are spatially 1 mm to 2 mm apart from each other. The s-polarized light emitted by one image display device 13 is reflected by the first reflective layer 6 , and the p-polarized light emitted by the other image display device 14 is reflected by the second reflective layer 7 .

The image emitted by the image display device 13 emitting s-polarized light is different from the image emitted by the image display device 14 emitting p-polarized light. For example, one image corresponds to an image for the right eye and another image corresponds to an image for the left eye, or vice versa. Therefore, different content is displayed for the observer's right and left eyes. The image emitted by the image display device 13 emitting s-polarized light and the image emitted by the image display device 14 emitting p-polarized light are implemented, and corresponding projected virtual images are arranged relative to each other so that there is a stereoscopic virtual image for the observer.

The image display device 13 emitting s-polarized light and the image display device 14 emitting p-polarized light are preferably arranged horizontally adjacent to each other when viewed through the composite glass plate 1 from the outside. In FIGS. 22 and 23 , in order to simplify the representation, the image display devices are drawn offset from each other.

List of reference signs

1 composite glass panel

2 outer glass panels

3 inner glass panels

4 thermoplastic intermediate layer

5 opaque masking layer

6 first reflective layer

7 second reflective layer

8 first adhesive layer

9 Second adhesive layer

10 coatings

11 Attach opaque overlay print

12 Image display device

13 Image display device emitting s-polarized light

14 Image display device emitting p-polarized light

100 projection components

O upper edge

U lower edge

K side edge

B projection area

H main perspective area

I outer surface of outer glass plate 2

II inner surface of outer glass panel 2

III outer surface of inner glass plate 3

Inner surface of IV inner glass plate 3

X‘-X section line

p polarized light

s s polarized light

Claims (15)

1. A composite glass plate (1) with a projection area (B) and a main perspective area (H), including at least an outer glass plate (2), an inner glass plate (3), a thermoplastic intermediate layer (4), and an opaque shield layer (5), first reflective layer (6) and second reflective layer (7), wherein, The outer glass pane (2) has an outer surface (I) facing away from the thermoplastic intermediate layer (4) and an inner surface (II) facing the thermoplastic intermediate layer (4), and the inner glass pane (3) has an outer surface (III) facing the thermoplastic intermediate layer (4) and an inner surface (IV) facing away from the thermoplastic intermediate layer (4), The projection area (B) is arranged outside the main see-through area (H), Said first reflective layer (6) is adapted to reflect s-polarized light and is arranged at least in said projection area (B) and adjacent said inner surface (IV) of said inner glass pane (3) , The second reflective layer (7) is adapted to reflect p-polarized light, is arranged at least in the projection area (B) and is arranged between the outer glass pane (2) and the thermoplastic intermediate layer (4) or Between the thermoplastic intermediate layer (4) and the inner glass pane (3), The opaque shielding layer (5) is arranged outside the main see-through area (H) and is spatially arranged above the second reflective layer (7) when viewed from the inside through the composite glass pane (1) ) behind, When viewed vertically through the composite glass panel (1), the projection area (B) is entirely located in the area of the composite glass panel (1) where the opaque shielding layer (5) is arranged. 2. Composite glass pane (1) according to claim 1, wherein the first reflective layer (6) is arranged substantially adjacent the inner surface (IV) of the inner glass pane (3) on the entire surface, and/or the second reflective layer (7) is arranged substantially on the entire surface between the outer glass pane (2) and the inner glass pane (4). 3. Composite glass pane (1) according to claim 1, wherein in one area of the composite glass pane (1) the first reflective layer (6) is arranged in contact with the inner glass pane (1). The inner surface (IV) of 3) is adjacent and, when viewed vertically through the composite glass panel (1), the area is completely located in the area where the opaque shielding layer (5) is arranged, and/or , in one area of the composite glass panel (1), the second reflective layer (7) is arranged between the outer glass panel (2) and the inner glass panel (3). When the composite glass plate (1) is viewed vertically, the entire area is located in the area where the opaque shielding layer (5) is arranged. 4. The composite glass plate (1) according to any one of claims 1 to 3, wherein when viewed vertically through the composite glass plate (1), the first reflective layer (6) and the The second reflective layer (7) completely overlaps. 5. Composite glass pane (1) according to any one of claims 1 to 4, wherein the first reflective layer (6) and the second reflective layer (7) are implemented as reflective coatings independently of each other. layer or reflective film. 6. Composite glass pane (1) according to any one of claims 1 to 5, wherein the second reflective layer (7) is arranged between the inner glass pane (3) and the thermoplastic intermediate layer ( 4), and a first adhesive layer (8) is arranged between the second reflective layer (7) and the inner glass plate (3), Or the second reflective layer (7) is arranged between the outer glass plate (2) and the thermoplastic intermediate layer (4), and between the second reflective layer (7) and the outer glass plate (4) 2) A first adhesive layer (8) is arranged between them. 7. Composite glass pane (1) according to any one of claims 1 to 6, wherein the first reflective layer (6) is implemented as a reflective film and the first reflective layer (6) is formed by Two adhesive layers (9) are bonded to the inner surface (IV) of the inner glass pane (3). 8. Composite glass pane (1) according to any one of claims 1 to 7, wherein said opaque screening layer (5) is arranged at least partially in the peripheral edge region, and in particular said opaque screening layer The layer has a greater width in a section overlapping said projection area (B) than in a section different from said section. 9. Composite glass pane (1) according to any one of claims 1 to 8, wherein said opaque shielding layer (5) is implemented on said inner surface (II) of said outer glass pane (2) ), or are implemented as opaque colored areas of the thermoplastic intermediate layer (4). 10. Composite glass pane (1) according to any one of claims 1 to 9, further comprising a coating (10) implemented as a protective coating and/or an antifouling layer and/ or waterproof layer and is arranged on the surface of the first reflective layer (6) facing away from the inner glass plate (3). 11. Composite glass pane (1) according to any one of claims 1 to 10, wherein said composite glass pane (1) has said inner side surface (IV) of said inner glass pane (3) An additional opaque cover print (11) is arranged outside the main see-through area (H) and in a peripheral edge area outside the projection area (B). 12. A projection component (100), at least including: - Composite glass pane (1) according to any one of claims 1 to 11, and - at least one image display device (12) directed towards the projection area (B) and arranged such that the inner surface (IV) of the inner glass pane (3) is the inner The surface of the glass plate (3) closest to the image display device (12). 13. The projection assembly (100) according to claim 12, wherein the projection assembly (100) has exactly one image display device (12) which emits s-polarized light and p-polarized light alternately. polarized light. 14. The projection assembly (100) according to claim 12, wherein the projection assembly (100) has two image display devices (12), one of which emits s-polarized light and the other which emits p-polarized light. 15. Use of a composite glass pane (1) according to any one of claims 1 to 11 as a vehicle glazing in a mobile device traveling on land, air or water, in particular in a motor vehicle, in particular Use as a windshield for a heads-up display.