Composite disc with delay plate

Description

[0001] The invention relates to a composite disk with a λ / 4 delay plate, a projection arrangement and the use of the composite disk.

[0002] To display navigation information on windshields, projection systems known as head-up displays (HUDs) are frequently used. These consist of an image display device and a windshield with a wedge-shaped thermoplastic interlayer and / or wedge-shaped lenses. A wedge angle is necessary to prevent double images. The projected image appears as a virtual image at a certain distance from the windshield, so that the driver perceives, for example, the projected navigation information as being directly in front of them on the road. The radiation from HUD image display devices is typically s-polarized due to the windshield's superior reflective properties compared to p-polarization.However, if the viewer is wearing polarization-selective sunglasses that do not transmit s-polarized light, they will perceive the HUD image only as dimly lit, if at all. One solution to this problem is the use of projection setups that utilize p-polarized light.

[0003] DE102014220189A1 discloses a head-up display projection arrangement that operates with p-polarized radiation, wherein the windshield has a reflective structure that reflects p-polarized radiation towards the viewer. US20040135742A1 also discloses a head-up display projection arrangement using p-polarized radiation that has a reflective structure. WO 96 / 19347A3 proposes a multilayer polymer layer as the reflective structure.

[0004] When designing a display based on head-up display technology, it is essential to ensure that the image display device has sufficient power to guarantee adequate brightness and clear visibility of the projected image, especially in sunlight. This necessitates a larger display device and entails correspondingly higher power consumption.

[0005] Therefore, there is a need for improved laminated lenses for projection systems that can avoid these disadvantages. Specifically, there is a need for improved laminated lenses for projection systems that offer good contrast of the generated image even in backlighting, low energy consumption, and where projected images are clearly visible to a viewer wearing polarization-selective sunglasses. The present invention aims to provide such an improved laminated lens, a method for its manufacture and use, and an improved projection system incorporating an improved laminated lens.

[0006] This problem is solved according to the invention by a composite disk according to claim 1, a projection arrangement, and a use according to the dependent claims. Preferred embodiments are described in the dependent claims.

[0007] The composite disc according to the invention comprises an outer disc, at least one thermoplastic intermediate layer, a reflective layer, an opaque masking layer, an inner disc, an adhesive layer and a λ / 4 retarder plate.

[0008] The composite pane has a main viewing area and a projection area.

[0009] The laminated glass is designed to separate the interior of a vehicle from the outside environment within a window opening. For the purposes of this invention, the term "inner glass" refers to the pane of the laminated glass facing the vehicle interior. The term "outer glass" refers to the pane facing the outside environment.

[0010] The laminated glass pane has a top edge and a bottom edge, as well as two side edges running between them. The top edge is the edge that is intended to point upwards when installed. The bottom edge is the edge that is intended to point downwards when installed. In the case of a windshield, the top edge is often also referred to as the roof edge and the bottom edge as the engine edge.

[0011] The outer pane and the inner pane each have an outer and an inner surface and a circumferential side edge running between them.

[0012] For the purposes of this invention, the term "outer surface" refers to the main surface intended to face the external environment when installed. The term "inner surface" refers to the main surface intended to face the interior when installed. The inner surface of the outer pane and the outer surface of the inner pane face each other and are connected by at least one thermoplastic intermediate layer. Thus, the outer surface of the outer pane faces away from the at least one thermoplastic intermediate layer, and the inner surface of the outer pane faces the at least one thermoplastic intermediate layer.The outer surface of the inner disc faces the at least one thermoplastic intermediate layer, and the inner surface of the inner disc faces away from the at least one thermoplastic intermediate layer.

[0013] The outer surface of the outer pane is designated as Side I. The inner surface of the outer pane is designated as Side II. The outer surface of the inner pane is designated as Side III. The inner surface of the inner pane is designated as Side IV.

[0014] According to the invention, the projection area is arranged outside the main viewing area. This means that the projection area and the main viewing area do not overlap. In a preferred embodiment, the main viewing area and the projection area are spaced apart from each other, i.e., they are not adjacent to each other. In a further embodiment, the projection area and the main viewing area are adjacent to each other, i.e., they are directly adjacent to each other.

[0015] The reflective layer is suitable for reflecting light. It is therefore a light-reflecting layer. The reflective layer is suitable, for example, for reflecting p-polarized light and / or circularly polarized light. It can thus be designed as a p-polarized light-reflecting layer and / or as a circularly polarized light-reflecting layer. According to the invention, the reflective layer is arranged between the outer and inner panes and is located at least in the projection area.

[0016] The reflective layer preferably reflects at least 5%, more preferably at least 10%, of the light incident on the reflective layer in a wavelength range of 450 nm to 650 nm and incidence angles of 55° to 75°. More preferably, the reflective layer reflects 30% or more, more preferably 50% or more, most preferably 70% or more, and particularly preferably 90% or more of the light incident on the reflective layer.

[0017] The opaque masking layer is arranged at least in the projection area between the outer and inner panes and, when viewed through the laminated glass, is positioned spatially behind the reflective layer, starting from the interior-facing surface of the inner pane. Thus, in the installed state of the laminated glass according to the invention in a vehicle, the reflective layer is closer to the vehicle interior than the opaque masking layer.

[0018] It is understood that the opaque masking layer is located outside the main viewing area of ​​the laminated glass. Because the opaque masking layer is located outside the main viewing area, the transparency of the laminated glass in the main viewing area is not affected by the opaque masking layer.

[0019] The λ / 4 retarder plate is bonded to the inner surface of the inner pane via the adhesive layer. When viewed perpendicularly through the laminated pane, the λ / 4 retarder plate is located in an area of ​​the laminated pane that lies entirely within the area where the opaque masking layer is located.

[0020] According to the invention, when viewed perpendicularly through the composite pane, the projection area lies entirely within the area of ​​the composite pane where the λ / 4 delay plate is located. Thus, when viewed perpendicularly through the composite pane, or in orthogonal projection through the composite pane, the projection area overlaps the λ / 4 delay plate. The projection area therefore has no section that does not overlap the λ / 4 delay plate.

[0021] Because the opaque masking layer is arranged at least in the projection area, the projection area is arranged in a perpendicular view through the composite disc or in an orthogonal projection through the composite disc in overlap or overlap with the opaque masking layer.

[0022] In a preferred embodiment of the composite disc according to the invention, the reflective layer is arranged substantially across the entire surface between the outer and inner discs. An substantially full-surface arrangement of the reflective layer is understood to mean a full-surface arrangement or a full-surface arrangement minus a circumferential edge region with a width of, for example, 5 mm to 50 mm. The width of the circumferential edge region can be constant or vary.

[0023] In a further preferred embodiment, the reflective layer between the outer pane and the inner pane is arranged in an area which, when viewed perpendicularly through the composite pane, lies entirely within the area in which the opaque masking layer is arranged.

[0024] As described above, the reflective layer is arranged between the outer and inner panes. In a preferred embodiment, the reflective layer is arranged between the inner pane and the at least one thermoplastic intermediate layer. In another preferred embodiment, the reflective layer is arranged between the outer pane and the at least one thermoplastic intermediate layer. In embodiments in which the composite pane has at least two thermoplastic intermediate layers, the reflective layer can be arranged between the inner pane and the at least two thermoplastic intermediate layers, or between the outer pane and the at least two thermoplastic intermediate layers, or, in particular, between two of the at least two thermoplastic intermediate layers.

[0025] Preferably, the adhesive layer is a thermoplastic polymer layer or an optically clear adhesive (OCA).

[0026] Suitable optical clear adhesives, so-called optical clear adhesives (OCAs), are known to experts.

[0027] An adhesive layer designed as a thermoplastic polymer layer contains at least one thermoplastic polymer, preferably ethylene vinyl acetate (EVA), polyvinyl butyral (PVB), or polyurethane (PU), or mixtures, copolymers, or derivatives thereof, particularly preferably PVB. The thermoplastic polymer layer is typically 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 (micrometers). The thermoplastic polymer layer can be formed from a single film or from more than one film.

[0028] The opaque masking layer is preferably a peripheral, i.e., frame-like, masking layer, which is thus arranged in a circumferential edge area. A peripheral opaque masking layer also serves as UV protection for the mounting adhesive of the laminated glass.

[0029] Particularly preferred are embodiments in which the projection area is arranged adjacent to the lower edge of the composite panel. The projection area can be arranged either directly adjacent or indirectly adjacent to the lower edge. "Indirectly adjacent" means that the projection area does not directly abut the lower edge, but is spaced away from it by, for example, a few centimeters, such as 1 cm to 10 cm, preferably 1 cm to 5 cm.

[0030] Because the projection area, when viewed perpendicularly through the composite pane, lies entirely within the area of ​​the composite pane in which the λ / 4 delay plate is arranged, and the λ / 4 delay plate is arranged in an area of ​​the composite pane which, when viewed perpendicularly through the composite pane, lies entirely within the area in which the opaque masking layer is arranged, the opaque masking layer is consequently also preferably arranged at least in an area adjacent to the lower edge of the composite pane.

[0031] In a preferred embodiment of a composite disc according to the invention, the opaque masking layer is arranged at least partially in a circumferential edge region and has a greater width, in particular in a section that overlaps the projection area, than in sections different from this.

[0032] The opaque masking layer according to the invention is a layer that prevents visibility through the composite pane. The opaque masking layer allows a transmission of at most 10%, preferably at most 5%, particularly preferably at most 2%, and most preferably at most 1%, particularly preferably at most 0.1%, of the visible spectrum. The opaque masking layer is preferably black.

[0033] The opaque masking layer is preferably a coating consisting of one or more layers. Alternatively, it can also be an opaque element embedded in the laminated glass, for example, a film. According to a preferred embodiment of the laminated glass, the opaque masking layer consists of a single layer. This has the advantage of particularly simple and cost-effective manufacturing of the laminated glass, since only a single layer needs to be formed for the opaque masking layer.

[0034] The opaque masking layer is in particular an opaque cover print made of a dark, preferably black, enamel.

[0035] An opaque masking layer, designed as an opaque cover print, can be applied across the entire surface. The cover print can also be semi-transparent, at least in sections, for example, as a dot matrix, stripe matrix, or grid. Alternatively, the cover print can also have a gradient, for example, from an opaque to a semi-transparent layer. Preferably, the masking layer, designed as an opaque cover print, is applied across the entire surface, at least in the projection area.

[0036] In a preferred embodiment, the opaque masking layer is formed as an opaque covering print on the interior surface of the outer pane.

[0037] In one embodiment, the opaque masking layer is formed as an opaque colored area of ​​the at least one thermoplastic intermediate layer.

[0038] In one embodiment, the composite disc has a thermoplastic intermediate layer that is formed in one piece and is opaque in one area. In another embodiment, the composite disc has at least two thermoplastic intermediate layers, one of which is formed in one piece and is opaque in one area.

[0039] An opaque masking layer, designed as an opaque colored area of ​​a thermoplastic interlayer, can also be realized by using a thermoplastic interlayer composed of an opaque thermoplastic film and a transparent thermoplastic film. The opaque thermoplastic film and the transparent thermoplastic film are preferably arranged offset from one another so that the two films do not overlap when viewed through the laminated panel. The transparent and the opaque films are made of the same plastic or preferably contain the same plastic. The materials on which the opaque film and the transparent film can be based are those also described for the at least one thermoplastic interlayer. The opaque film is preferably a colored film, which can have various colors, particularly black.

[0040] From the perspective of a vehicle occupant, the reflective layer, when viewed through the inner pane, is positioned spatially in front of the opaque masking layer, at least in some areas. The area of ​​the laminated pane where the reflective layer is positioned spatially in front of the opaque masking layer thus appears opaque. The reflective layer is preferably transparent in the area in front of the opaque masking layer, but it can also be opaque itself. The expression "viewed through the laminated pane" means that the view is through the laminated pane, starting from the interior surface of the inner pane. For the purposes of the present invention, "spatially in front" means that the reflective layer is positioned further away from the exterior surface of the outer pane than the opaque masking layer.

[0041] The composite pane according to the invention can optionally have an additional opaque covering print on the interior surface of the outer pane, on the exterior surface of the inner pane or on the interior surface of the inner pane, provided that this additional opaque covering print is arranged in an area outside the main viewing area and outside the projection area.

[0042] The reflective layer is preferably designed as a reflective coating or as a reflective film.

[0043] In a preferred embodiment, the reflective layer is designed as a reflective coating of the outer surface of the inner disk.

[0044] In a further preferred embodiment, the reflective layer is designed as a reflective coating of the interior surface of the outer pane, with the proviso that the opaque masking layer is arranged spatially behind the reflective layer when viewed through the composite pane from the interior surface of the inner pane.

[0045] The reflective layer can also be designed as a reflective coating of the thermoplastic intermediate layer.

[0046] The reflective layer preferably comprises at least one metal selected from a group consisting of aluminium, tin, titanium, copper, chromium, cobalt, iron, manganese, zirconium, cerium, yttrium, silver, gold, platinum and palladium, or mixtures thereof.

[0047] In a preferred embodiment of the invention, the reflective layer is a reflective coating comprising a thin-film stack, i.e., a sequence of thin individual layers. This thin-film stack contains one or more electrically conductive layers based on silver. The electrically conductive layer based on silver imparts the fundamental reflective properties to the reflective coating, as well as IR-reflective properties and electrical conductivity. The electrically conductive layer is silver-based. The conductive layer preferably contains at least 90 wt.% silver, more preferably at least 99 wt.% silver, and most preferably at least 99.9 wt.% silver. The silver layer may contain dopants, for example, palladium, gold, copper, or aluminum.Materials based on silver are particularly suitable for reflecting p-polarized light. The coating has a thickness of 5 µm to 50 µm and preferably 8 µm to 25 µm.

[0048] The reflective layer can also be configured as a reflective coated or uncoated film. The reflective layer can be a substrate film with a reflective coating or an uncoated reflective polymer film. The reflective coating preferably comprises at least one metal-based layer and / or a dielectric layer sequence with alternating refractive indices. The metal-based layer preferably contains or consists of silver and / or aluminum. The dielectric layers can be, for example, based on silicon nitride, zinc oxide, tin-zinc oxide, silicon-metal mixed nitrides such as silicon-zirconium nitride, zirconium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, or silicon carbide. The aforementioned oxides and nitrides can be deposited stoichiometrically, substoichiometrically, or superstoichiometrically.They may contain dopants, for example, aluminum, zirconium, titanium, or boron. The reflective uncoated polymer film preferably comprises or consists of dielectric polymer layers. The dielectric polymer layers preferably contain polyethylene terephthalate (PET). If the reflective layer is designed as a reflective film, it is preferably 30 µm to 300 µm thick, particularly preferably 50 µm to 200 µm thick, and especially 100 µm to 150 µm thick.

[0049] If the reflective layer is designed as a reflective coating, it is preferably applied to the inner surface of the outer disk or to the outer surface of the inner disk by physical vapor deposition (PVD), particularly preferably by sputtering, and most preferably by magnetron sputtering. However, the coating can also be applied, for example, by chemical vapor deposition (CVD), plasma-enhanced chemical vapor deposition (PECVD), evaporation, or atomic layer deposition (ALD).

[0050] If it is a coated, reflective film, the coating processes CVD or PVD can also be used for its production.

[0051] According to a further preferred embodiment of the composite pane according to the invention, the reflective layer is designed as a reflective coated carrier film or an uncoated polymer film and is preferably arranged between two thermoplastic intermediate layers. The advantage of this arrangement is that the reflective layer does not have to be applied to the outer or inner pane using thin-film technology (for example, CVD and PVD). This results in applications of the reflective layer with further advantageous functions, such as more homogeneous reflection of light at the reflective layer.

[0052] The reflective layer can also be designed 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 to the interior surface, i.e., the surface facing the vehicle interior. Such films are particularly suitable for reflecting p-polarized light. Suitable reflective films are described, for example, in US 5,882,774 A.

[0053] As described above, in a preferred embodiment, the reflective layer comprises at least one electrically conductive base layer of silver. The conductive layer preferably contains at least 90 wt.% silver, more preferably at least 99 wt.% silver, and most preferably at least 99.9 wt.% silver. The silver layer may contain dopants, for example, palladium, gold, copper, or aluminum. The thickness of the silver layer is typically from 5 nm to 20 nm.

[0054] Dielectric layers or sequences of layers are typically arranged above and below the electrically conductive layer. If the reflective coating comprises several conductive layers, each conductive layer is preferably arranged between two typically dielectric layers or sequences of layers, so that a dielectric layer or sequence of layers is arranged between adjacent conductive layers. The reflective layer is therefore preferably a thin-film stack with n electrically conductive layers and (n+1) dielectric layers or sequences of layers, where n is a natural number and where a conductive layer and a dielectric layer or sequence of layers alternately follow each lower dielectric layer or sequence. Such reflective coatings are known as solar control coatings and heatable coatings.Due to its at least one electrically conductive layer, the reflective coating exhibits IR-reflective properties, thus functioning as a sun protection coating that reduces the heating of the vehicle interior by reflecting thermal radiation. The reflective coating can also be used as a heating coating when electrically connected, allowing a current to flow through it and heat the reflective coating.

[0055] Examples of common dielectric layers in such a thin-film stack are: Anti-reflective coatings, which reduce the reflection of visible light and thus increase the transparency of the coated disc, for example based on silicon nitride, silicon-metal mixed nitrides such as silicon zirconium nitride, titanium oxide, aluminum nitride or tin oxide, with layer thicknesses of, for example, 10 nm to 100 nm; matching layers, which improve the crystallinity of the electrically conductive layer, for example based on zinc oxide (ZnO), with layer thicknesses of, for example, 3 nm to 20 nm; smoothing layers, which improve the surface structure for the layers above, for example based on a non-crystalline oxide of tin, silicon, titanium, zirconium, hafnium, zinc, gallium and / or indium, in particular based on tin-zinc mixed oxide (ZnSnO), with layer thicknesses of, for example, 3 nm to 20 nm.

[0056] Due to its at least one electrically conductive layer, such a reflective layer exhibits reflective properties in the visible spectral range, which to some extent always also occur with respect to p-polarized radiation. By appropriately selecting the layer thicknesses, particularly the dielectric layer sequence, the reflection against p-polarized radiation can be specifically optimized.

[0057] In addition to electrically conductive and dielectric layers, the reflective layer can also include blocker layers, which protect the conductive layers from degradation. Blocker layers are typically very thin, metal-containing layers based on niobium, titanium, nickel, chromium, and / or alloys, with layer thicknesses of, for example, 0.1 nm to 2 nm.

[0058] In a particularly preferred embodiment, the reflective layer comprises exactly one electrically conductive layer based on silver.

[0059] In a particularly preferred embodiment, the reflective layer comprises exactly one electrically conductive layer based on silver, and below the electrically conductive layer is a lower dielectric layer or sequence of layers having a refractive index of at least 1.9, and above the electrically conductive layer is an upper dielectric layer or sequence of layers having a refractive index of at least 1.9, and the ratio of the optical thickness of the upper dielectric layer or sequence to the optical thickness of the lower dielectric layer or sequence is at least 1.7. The reflective layer can thus be constructed, for example, as described in WO 2021 / 104800 A1.

[0060] Refractive indices are generally specified within the scope of the present invention with reference to a wavelength of 550 nm. Methods for determining refractive indices are known to those skilled in the art. The refractive indices specified within the scope of the invention can, for example, be determined by ellipsometry, using commercially available ellipsometers. Unless otherwise specified, the specification of layer thicknesses or thicknesses refers to the geometric thickness of a layer.

[0061] If a first layer is arranged above a second layer, this means, according to the invention, that the first layer is arranged further away from the substrate on which the coating is applied than the second layer. If a first layer is arranged below a second layer, this means, according to the invention, that the second layer is arranged further away from the substrate than the first layer.

[0062] If a layer is formed based on a material, the layer consists predominantly of that material, in particular essentially of that material, along with any impurities or dopants. The oxides and nitrides mentioned can be deposited stoichiometrically, substoichiometrically, or superstoichiometrically (even if a stoichiometric total concentration is given for clarity). They may contain dopants, for example, aluminum, zirconium, titanium, or boron.

[0063] The composite disc may additionally include a coating, which is designed as a protective coating or an anti-reflective coating and is arranged on the surface of the λ / 4 retarder plate facing away from the adhesive layer.

[0064] Experts are familiar with suitable protective coatings or anti-reflective coatings.

[0065] The outer and inner panes are preferably made of glass, in particular soda-lime glass, which is common for window panes. However, the panes can also be made of other types of glass (for example, borosilicate glass, quartz glass, aluminosilicate glass) or transparent plastics (for example, polymethyl methacrylate or polycarbonate). The thickness of the outer and inner panes can vary widely. Preferably, panes with a thickness in the range of 0.8 mm to 5 mm, more preferably from 1.4 mm to 2.5 mm, are used, for example, those with the standard thicknesses of 1.6 mm or 2.1 mm.

[0066] In a preferred embodiment, the inner disk has a thickness of at most 1.6 mm, particularly preferably at most 1.4 mm, and most preferably at most 1.1 mm.

[0067] The outer pane, the inner pane, and the at least one thermoplastic intermediate layer can be clear and colorless, or tinted or colored. In a preferred embodiment, the total transmission through the windshield (including the reflective coating) in the main viewing area is greater than 70% (light type A). The term "total transmission" refers to the procedure for testing the light transmittance of motor vehicle windows as specified in ECE-R 43, Annex 3, Section 9.1. The outer pane and the inner pane can be independently unstressed, partially stressed, or stressed. If at least one of the panes is to have a stress, this can be a thermal or chemical stress.

[0068] Preferably, the inner pane is not colored or tinted.

[0069] The laminated glass is preferably curved in one or more spatial directions, as is common for automotive windshields, with typical radii of curvature ranging from about 10 cm to about 40 m. However, the laminated glass can also be flat, for example, if it is intended as a windshield for buses, trains, or tractors.

[0070] The at least one thermoplastic intermediate layer contains at least one thermoplastic polymer, preferably ethylene vinyl acetate (EVA), polyvinyl butyral (PVB), or polyurethane (PU), or mixtures, copolymers, or derivatives thereof, particularly preferably PVB. The thickness of the intermediate layer is preferably from 0.2 mm to 2 mm, particularly preferably from 0.3 mm to 1 mm. The at least one thermoplastic intermediate layer can also be a film with functional properties, for example, a film with acoustic damping properties. Preferably, the at least one thermoplastic intermediate layer is of constant thickness, apart from any surface roughness customary in the industry, i.e., it does not have a wedge-shaped cross-section.

[0071] Retardation plates, also called retardation layers or wave plates, are optical elements that create a phase shift in the transmitted light. The desired retardation is achieved by varying the thickness and orientation of the retardation plate in the beam path. A phase shift of 90° is referred to as a λ / 4 plate, quarter-wave plate, or circular polarizer.

[0072] Suitable λ / 4 retarding plates are known to the expert.

[0073] λ / 4 retarder plates are made of birefringent materials. Birefringent materials have slightly different refractive indices for light.

[0074] In a preferred embodiment, the λ / 4 retarder plate is designed as a polymeric retarder plate. λ / 4 retarder plates are commercially available in the form of birefringent plastic films. Polymeric components adapt very well to any three-dimensional bending of the disc and can be easily integrated into the composite disc.

[0075] In another preferred embodiment, the λ / 4 retardation plate is designed as a retardation plate made of crystalline quartz or sapphire.

[0076] λ / 4 retarder plates are used to convert linearly polarized light into circularly polarized light and vice versa. The polarization of the incident beam must be at an angle of less than 45° to the optical axis of the plate. λ / 4 retarder plates have a design wavelength of approximately 560 nm.

[0077] A composite disc according to the invention can be manufactured by a method comprising at least: a) Provision of a composite with a projection area, a main viewing area, a top edge, a bottom edge and two lateral pane edges, comprising an outer pane with an outer surface and an inner surface, at least one thermoplastic interlayer, a reflective layer, an opaque masking layer and an inner pane with an outer surface and an inner surface, wherein the outer pane has an outer surface facing away from the at least one thermoplastic interlayer and an inner surface facing the at least one thermoplastic interlayer, and the inner pane has an outer surface facing the at least one thermoplastic interlayer and an inner surface facing away from the at least one thermoplastic interlayer.the projection area is arranged outside the main viewing area, the reflective layer is arranged at least in the projection area between the outer pane and the inner pane, the opaque masking layer is arranged at least in the projection area between the outer pane and the inner pane and, when viewed through the composite from the interior surface of the inner pane, is spatially arranged behind the reflective layer; b) providing a λ / 4 delay plate and an adhesive layer; c) joining the λ / 4 delay plate to the interior surface of the inner pane of the composite via the adhesive layer to form a composite pane with a projection area, a main viewing area, a top edge, a bottom edge and two lateral pane edges, such that the λ / 4 delay plate is arranged in a region of the composite pane,the projection area, when viewed perpendicularly through the composite pane, lies entirely within the area where the opaque masking layer is located, and the projection area, when viewed perpendicularly through the composite pane, lies entirely within the area where the λ / 4 delay plate is located.

[0078] A composite disc according to the invention can also be manufactured by a method comprising at least: a) Provision of a stacking sequence comprising a projection area, a main viewing area, a top edge, a bottom edge and two lateral disc edges, comprising an outer disc with an outer surface and an inner surface, at least one thermoplastic interlayer, a reflective layer, an opaque masking layer, an inner disc with an outer surface and an inner surface, an adhesive layer and a λ / 4 retarder plate, wherein the outer disc has an outer surface facing away from the at least one thermoplastic interlayer and an inner surface facing the at least one thermoplastic interlayer, and the inner disc has an outer surface facing the at least one thermoplastic interlayer and an inner surface facing away from the at least one thermoplastic interlayer.the projection area is arranged outside the main viewing area, the reflective layer is arranged at least in the projection area between the outer pane and the inner pane, the opaque masking layer is arranged at least in the projection area between the outer pane and the inner pane and, when viewed through the composite pane, is spatially arranged behind the reflective layer starting from the inner surface of the inner pane, the λ / 4 retarder plate is arranged in an area of ​​the stacking sequence which, when viewed perpendicularly through the stacking sequence, lies completely within the area where the opaque masking layer is arranged, the adhesive layer is arranged between the λ / 4 retarder plate and the inner surface of the inner pane and is designed as a thermoplastic polymer layer,and the projection area, when viewed perpendicularly through the stacking sequence, lies entirely within the area of ​​the stacking sequence where the λ / 4 retarder plate is located; b) joining the stacking sequence to form a composite panel with a projection area, a main viewing area, a top edge, a bottom edge, and two lateral panel edges by lamination.

[0079] The invention also relates to a projection arrangement comprising a composite disc according to the invention and an image display device directed towards the projection area of ​​the composite disc. The image display device is arranged such that the inner surface of the inner disc is the surface of the inner disc closest to the image display device.

[0080] The invention therefore also relates to a projection arrangement comprising a composite pane with a projection area, a main viewing area, a top edge, a bottom edge and two lateral pane edges, comprising at least an outer pane, at least one thermoplastic interlayer, a reflective layer, an opaque masking layer, an inner pane, an adhesive layer and a λ / 4 delay plate, wherein the outer pane has an outer surface facing away from the at least one thermoplastic interlayer and an inner surface facing the at least one thermoplastic interlayer, and the inner pane has an outer surface facing the at least one thermoplastic interlayer and an inner surface facing away from the at least one thermoplastic interlayer, the projection area being arranged outside the main viewing area,the reflective layer is arranged at least in the projection area between the outer pane and the inner pane, the opaque masking layer is arranged at least in the projection area between the outer pane and the inner pane and, when viewed through the laminated pane, is spatially arranged behind the reflective layer starting from the inner surface of the inner pane, the λ / 4 delay plate is connected to the inner surface of the inner pane via the adhesive layer and is arranged in an area of ​​the laminated pane which, when viewed perpendicularly through the laminated pane, lies completely within the area where the opaque masking layer is arranged, and the projection area, when viewed perpendicularly through the laminated pane, lies completely within the area of ​​the laminated pane where the λ / 4 delay plate is arranged, and an image display device,which is directed towards the projection area and is arranged such that the inner surface of the inner disc is the surface of the inner disc closest to the image display device.

[0081] In a preferred embodiment of the projection arrangement according to the invention, the image display device emits s-polarized light. This light first strikes the λ / 4 delay plate and is converted by it into circularly polarized light, which then strikes the reflective layer. The circularly polarized light is reflected by the reflective layer, thereby changing its direction of rotation. Before the reflected circularly polarized light leaves the composite disc, it passes through the λ / 4 delay plate again and is converted into p-polarized light. The p-polarized light is also clearly visible to a viewer wearing polarization-selective sunglasses. This is an advantage of the projection arrangement according to the invention: when using an image display device emitting s-polarized light, p-polarized light reaches the viewer.

[0082] In a further preferred embodiment of the projection arrangement according to the invention, the image display device emits circularly polarized light. This light first strikes the λ / 4 delay plate and is converted by it into p-polarized light, which then strikes the reflective layer. The p-polarized light is reflected by the reflective layer. Before the reflected p-polarized light leaves the composite lens, it passes through the λ / 4 delay plate again and is converted back into circularly polarized light. The circularly polarized light is also clearly visible to a viewer wearing polarization-selective sunglasses.

[0083] The preferred embodiments of the composite disk according to the invention described above also apply accordingly to the projection arrangement according to the invention comprising a composite disk according to the invention and an image display device and vice versa.

[0084] The term p-polarized light refers to light in the visible spectrum that exhibits p-polarization. The polarization direction is considered relative to the plane of incidence of the radiation on the composite disk. P-polarized radiation is defined as radiation whose electric field oscillates in the plane of incidence. S-polarized radiation is defined as radiation whose electric field oscillates perpendicular to the plane of incidence. The plane of incidence is defined by the incidence vector and the surface normal of the composite disk at the geometric center of the irradiated area. In other words, the polarization, and in particular the proportion of p- and s-polarized radiation, is determined at a point within the area illuminated by the light source, preferably at the geometric center of the irradiated area.Since composite panes can be curved (for example, when they are designed as windshields), which affects the plane of incidence of the radiation, slightly different polarization components can occur in the other areas, which is unavoidable for physical reasons.

[0085] Within the scope of this application, the projection area is defined as the area which, when the composite screen is used in a projection arrangement comprising the composite screen and an image display device, can be illuminated by the image display device. This area includes the portion of the composite screen through which the light reflected by the reflective layer is reflected to the viewer. The area through which a driver or viewer primarily sees through the composite screen is referred to within the scope of this application as the main viewing area.

[0086] For the purposes of the present invention, "transparent" means that the overall transmission of the laminated glass complies with the legal requirements for windshields and preferably has a transmittance of more than 50% and, in particular, more than 60%, for example, more than 70%, for visible light. Correspondingly, "opaque" means a light transmission of less than 10%, preferably less than 5%, and in particular 0%.

[0087] According to a preferred embodiment of the projection arrangement according to the invention, the image display device, which can be, for example, a projector or, more preferably, a display, can be configured as a liquid crystal display (LCD), thin-film transistor display (TFT), light-emitting diode (LED) display, organic light-emitting diode (OLED) display, electroluminescent (EL) display, microLED display, or the like, preferably as an LCD display. Energy-intensive projectors, such as those typically used in head-up display applications, are not strictly necessary. The aforementioned display variants and other similarly energy-efficient image display devices are sufficient. This results in a reduction in energy consumption.

[0088] Preferably, the radiation from the image display device strikes the composite disc at an angle of incidence of 55° to 80°, particularly preferably from 62° to 77°.

[0089] According to the invention, the use of a composite disc according to the invention as a vehicle disc in means of transport for traffic on land, in the air or on water, in particular in motor vehicles and in particular as a windscreen for a head-up display, is also possible.

[0090] The invention is explained in more detail with reference to drawings and exemplary embodiments. The drawings are schematic representations and not to scale. The drawings do not limit the invention in any way. They show: Fig. 1 a top view of an embodiment of a composite disc according to the invention, Fig. 2 a cross-section through the Fig. 1 The embodiment shown, Fig. 3 a cross-section through a further embodiment of a composite disc according to the invention, Fig. 4 a cross-section through a further embodiment of a composite disc according to the invention, Fig. 5 a cross-section through a further embodiment of a composite disc according to the invention, Fig. 6 a cross-section through a further embodiment of a composite disc according to the invention, Fig. 7 a cross-section through a further embodiment of a composite disc according to the invention, Fig. 8 a cross-section through a further embodiment of a composite disc according to the invention, Fig. 9 a cross-section through a further embodiment of a composite disc according to the invention, Fig. 10 a cross-section through a further embodiment of a composite disc according to the invention, Fig. 11 a cross-section through a further embodiment of a composite disc according to the invention.Fig. 12 a cross-section through a further embodiment of a composite disk according to the invention, Fig. 13 a cross-section through a projection arrangement according to the invention, Fig. 14 a cross-section through an embodiment of a projection arrangement according to the invention, Fig. 15 a cross-section through an embodiment of a projection arrangement according to the invention, Fig. 16 an enlarged section of a cross-section through an embodiment of a projection arrangement according to the invention, and Fig. 17 an enlarged section of a cross-section through a further embodiment of a projection arrangement according to the invention.

[0091] Fig. 1 shows a top view of an embodiment of a composite disk 1 according to the invention and in Fig. 2 is the cross-section through the in the Fig. 1 The composite disk 1 shown is shown along the section line XX'. The ones in the Fig. 1 und 2 The composite disc 1 shown has a top edge O, a bottom edge U and two side edges K. Furthermore, in the Fig. 1 The main viewing area H and the projection area B of the composite pane 1 are shown. The in the Fig. 1 und 2 The composite pane 1 shown comprises an outer pane 2 with an outer surface I and an inner surface II, an inner pane 6 with an outer surface III and an inner surface IV, a thermoplastic interlayer 3, a reflective layer 4, an opaque masking layer 5, an adhesive layer 7, and a λ / 4 retarder plate 8. The thermoplastic interlayer 3 is arranged between the outer pane 2 and the inner pane 6. The outer surface I of the outer pane 2 faces away from the thermoplastic interlayer 3, the inner surface II of the outer pane 2 faces the thermoplastic interlayer 3, the outer surface III of the inner pane 6 faces the thermoplastic interlayer 3, and the inner surface IV of the inner pane 6 faces away from the thermoplastic interlayer 3.The outer pane 2, the thermoplastic intermediate layer 3, the reflective layer 4, and the inner pane 6 are arranged one above the other across their entire surface. The projection area B is located outside the main viewing area H. In the Fig. 1 und 2 In the embodiment shown, the projection area B is arranged adjacent to the lower edge U. The opaque masking layer 5 is arranged between the outer pane 2 and the inner pane 6, at least in the projection area B, and, when viewed through the composite pane 1 from the inner surface IV of the inner pane 6, is located spatially behind the reflective layer 4. In the embodiment shown, Fig. 1 und 2 In the illustrated embodiment, the opaque masking layer 5 is designed as an opaque covering print arranged on the inner surface II of the outer pane 2 and is positioned in a circumferential edge region. This edge region has a greater width in a section overlapping the projection area B than in other sections. The λ / 4 delay plate 8 is connected to the inner surface IV of the inner pane 6 via the adhesive layer 7 and is located in a region of the composite pane 1. When viewed perpendicularly through the composite pane 1, this region lies entirely within the area where the opaque masking layer 5 is located. Similarly, when viewed perpendicularly through the composite pane 1, the projection area B lies entirely within the region of the composite pane 1 where the λ / 4 delay plate is located.

[0092] The thermoplastic intermediate layer 3, for example, is made of PVB and has a thickness of 0.76 mm. Apart from any surface roughness typical of the industry, the thermoplastic intermediate layer 3 has a substantially constant thickness – it is not designed as a wedge-shaped film.

[0093] The outer pane 2 and the inner pane 6 are made of soda-lime glass, for example. The outer pane 2 has a thickness of 2.1 mm, for example, and the inner pane 6 has a thickness of either 1.6 mm or 1.1 mm.

[0094] Adhesive layer 7 is, for example, an optically clear adhesive (OCA). Alternatively, adhesive layer 7 can also be a thermoplastic polymer layer, for example a PVB layer with a thickness of, for example, 0.38 mm.

[0095] In the Fig. 1 und 2 In the embodiment shown, a reflective layer 4, which is designed, for example, as a thin-film stack comprising at least one electrically conductive layer based on silver, is applied over the entire outer surface III of the inner disk 6.

[0096] Fig. 3 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 3 The embodiment shown differs from the one in the Fig. 2 The embodiment shown differs only in that the reflective layer 4 is arranged only in a region of the composite pane 1 which, when viewed perpendicularly through the composite pane 1, lies entirely within the region where the opaque masking layer 5 is located. In this embodiment, the reflective layer 4 can be designed as a coating of the outer surface III of the inner pane 6 or as a reflective film arranged between the thermoplastic intermediate layer 3 and the inner pane 6.

[0097] Fig. 4 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 4 The embodiment shown differs from the one in the Fig. 2 The only difference shown is that the reflective layer 4 is not arranged between the thermoplastic intermediate layer 3 and the inner pane 6, but rather between the thermoplastic intermediate layer 3 and the outer pane 2, with the proviso that the opaque masking layer 5, when viewed through the laminated pane 1 from the inner surface IV of the inner pane 6, is spatially located behind the reflective layer 4. The reflective layer 4, which is designed, for example, as a coating on the inner surface II of the outer pane 2, is thus not located directly on the outer pane 2, but rather on the opaque masking layer 5, in the areas where the opaque masking layer 5 is arranged as an opaque covering print on the inner surface II of the outer pane 2.

[0098] Fig. 5 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 5 The embodiment shown differs from the one in the Fig. 4 The embodiment shown differs only in that the reflective layer 4 is arranged only in a region of the composite pane 1 which, when viewed perpendicularly through the composite pane 1, lies entirely within the region where the opaque masking layer 5 is located. In this embodiment, the reflective layer 4 can be designed as a coating on the inner surface II of the outer pane 2 or as a reflective film arranged between the thermoplastic intermediate layer 3 and the outer pane 2, provided that, when viewed through the composite pane 1, the opaque masking layer 5 is spatially located behind the reflective layer 4, starting from the inner surface IV of the inner pane 6. A reflective layer 4 designed as a coating on the inner surface II of the outer pane 2 is therefore not arranged directly on the outer pane 2, but rather on the opaque masking layer 5.

[0099] Fig. 6 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 6 The embodiment shown differs from the one in the Fig. 2 The illustration shown differs only in that the composite disc 1 has two thermoplastic intermediate layers 3 and the reflective layer 4 is arranged between the two thermoplastic intermediate layers 3. In this embodiment, the reflective layer 4 can be designed as a coating of one of the two thermoplastic intermediate layers 3 or as a reflective film arranged between the two thermoplastic intermediate layers 3.

[0100] Fig. 7 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 7 The embodiment shown differs from the one in the Fig. 3 The illustration shown differs only in that the composite disc 1 has two thermoplastic intermediate layers 3 and the reflective layer 4 is arranged between the two thermoplastic intermediate layers 3. In this embodiment, the reflective layer 4 can be designed as a coating of one of the two thermoplastic intermediate layers 3 or as a reflective film arranged between the two thermoplastic intermediate layers 3.

[0101] Fig. 8 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 8 The embodiment shown differs from the one in the Fig. 2 shown only insofar as the opaque masking layer 5 is not designed as an opaque covering print on the interior surface II of the outer pane 2, but as an opaque colored area of ​​the thermoplastic intermediate layer 3.

[0102] In the area adjacent to the upper edge O, the thermoplastic intermediate layer 3 may alternatively have no coloring and optionally an opaque cover print may be applied to the interior surface II of the outer pane 2, to the exterior surface III of the inner pane 6 or to the interior surface IV of the inner pane 6.

[0103] Fig. 9 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 9 The embodiment shown differs from the one in the Fig. 8 The embodiment shown differs only in that the reflective layer 4 is arranged only in a region of the composite pane 1 which, when viewed perpendicularly through the composite pane 1, lies entirely within the region where the opaque masking layer 5 is located. In this embodiment, the reflective layer 4 can be designed as a coating of the outer surface III of the inner pane 6 or as a reflective film arranged between the thermoplastic intermediate layer 3 and the inner pane 6.

[0104] Fig. 10 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 10 The embodiment shown differs from the one in the Fig. 6 shown only insofar as the opaque masking layer 5 is not designed as an opaque covering print on the interior surface II of the outer pane 2, but as an opaque colored area of ​​the thermoplastic intermediate layer 3 nearest to the outer pane 2.

[0105] In the area adjacent to the upper edge O, the thermoplastic intermediate layer 3 closest to the outer pane 2 may alternatively have no coloring and optionally an opaque cover print may be applied to the interior surface II of the outer pane 2, to the exterior surface III of the inner pane 6 or to the interior surface IV of the inner pane 6.

[0106] Fig. 11 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 11 The embodiment shown differs from the one in the Fig. 10 The embodiment shown differs only in that the reflective layer 4 is arranged only in a region of the composite disc 1 which, when viewed perpendicularly through the composite disc 1, lies entirely within the region where the opaque masking layer 5 is located. In this embodiment, the reflective layer 4 can be designed as a coating of one of the two thermoplastic intermediate layers 3 or as a reflective film arranged between the two thermoplastic intermediate layers 3.

[0107] Fig. 12 shows a cross-section through another embodiment of a composite disk 1 according to the invention. The one in the Fig. 12 The embodiment shown differs from the one in the Fig. 2 shown only insofar as a coating 9 is arranged on the surface of the λ / 4 retarder plate 8 pointing away from the adhesive layer 7, which is designed as a protective coating or an anti-reflective coating.

[0108] Fig. 13 shows a cross-section through a projection arrangement 100 according to the invention. The in the Fig. 13 The projection arrangement 100 shown comprises a composite disk 1 according to the invention and an image display device 10. The composite disk 1 according to the invention is, for example, as shown in the Fig. 2 bis 12 The image display device 10 is directed towards the projection area B and arranged such that the interior surface IV of the inner disk 6 is the surface of the inner disk 6 closest to the image display device 10.

[0109] Fig. 14 Figure 1 shows a cross-section through an embodiment of a projection arrangement 100 according to the invention, comprising a composite disk 1 and an image display device 10. The composite disk 1 is as shown in the Fig. 2 The composite disc 1 shown in the Fig. 14 The projection arrangement 100 shown has a top edge O, a bottom edge U and two side edges K. Furthermore, in the Fig. 14 The main viewing area H and the projection area B of the composite pane 1 are shown. In the Fig. 14 In the illustrated embodiment of a projection arrangement 100, the composite pane 1 comprises an outer pane 2 with an outer surface I and an inner surface II, an inner pane 6 with an outer surface III and an inner surface IV, a thermoplastic intermediate layer 3, a reflective layer 4, an opaque masking layer 5, an adhesive layer 7, and a λ / 4 delay plate 8. The thermoplastic intermediate layer 3 is arranged between the outer pane 2 and the inner pane 6. The outer surface I of the outer pane 2 faces away from the thermoplastic intermediate layer 3, the inner surface II of the outer pane 2 faces the thermoplastic intermediate layer 3, the outer surface III of the inner pane 6 faces the thermoplastic intermediate layer, and the inner surface IV of the inner pane 6 faces away from the thermoplastic intermediate layer.The outer pane 2, the thermoplastic intermediate layer 3, the reflective layer 4, and the inner pane 6 are arranged one above the other across their entire surface. The projection area B is located outside the main viewing area H. In the Fig. 14 In the illustrated embodiment, the projection area B is arranged adjacent to the lower edge U. The opaque masking layer 5 is arranged between the outer pane 2 and the inner pane 6, at least in the projection area B, and, when viewed through the composite pane 1, is located spatially behind the reflective layer 4, starting from the interior surface IV of the inner pane 6. The opaque masking layer 5 is designed as an opaque covering print arranged on the interior surface II of the outer pane 2 and is arranged in a circumferential edge region, which has a greater width in a section overlapping the projection area B than in sections other than this.The λ / 4 delay plate is connected to the inner surface IV of the inner pane 6 via the adhesive layer 7 and is located in an area of ​​the composite pane 1 which, when viewed perpendicularly through the composite pane 1, lies entirely within the area where the opaque masking layer 5 is located. The projection area B, when viewed perpendicularly through the composite pane 1, lies entirely within the area of ​​the composite pane 1 where the λ / 4 delay plate 8 is located.

[0110] The thermoplastic intermediate layer 3, for example, is made of PVB and has a thickness of 0.76 mm. Apart from any surface roughness typical of the industry, the thermoplastic intermediate layer 3 has a substantially constant thickness – it is not designed as a wedge-shaped film.

[0111] The outer pane 2 and the inner pane 6 are made of soda-lime glass, for example. The outer pane 2 has a thickness of 2.1 mm, for example, and the inner pane 6 has a thickness of either 1.6 mm or 1.1 mm.

[0112] Adhesive layer 7 is, for example, an optically clear adhesive (OCA). Alternatively, adhesive layer 7 can also be a thermoplastic polymer layer, for example a PVB layer with a thickness of, for example, 0.38 mm.

[0113] In the Fig. 14 In the embodiment shown, a reflective layer 4, which is designed, for example, as a thin-film stack comprising at least one electrically conductive layer based on silver, is applied over the entire outer surface III of the inner disk 6.

[0114] Fig. 15 shows a cross-section through another embodiment of a projection arrangement 100 according to the invention, wherein the Fig. 15 embodiment shown from the one in the Fig. 14 differs only in that the reflective layer 4 is arranged only in a region of the composite pane 1 which, when viewed perpendicularly through the composite pane 1, lies entirely within the region where the opaque masking layer 5 is located. In this embodiment, the reflective layer 4 can be designed as a coating on the outer surface III of the inner pane 6 or as a reflective film arranged between the thermoplastic intermediate layer 3 and the inner pane 6. The composite pane 1 is in the Fig. 15 The embodiment shown is thus as in the Fig. 3 shown trained.

[0115] Fig. 16 Figure 1 shows an enlarged section of a cross-section through an embodiment of a projection arrangement 100 according to the invention, comprising a composite disk 1 and an image display device 10, with the beam path of the light emitted by the image display device 10 shown in more detail. The composite disk 1 is as shown in the Fig. 1 und 2 The image display device 10 emits s-polarized light. This light first strikes the λ / 4 retarder plate 8, which converts it into circularly polarized light, and then strikes the reflective layer 4. The circularly polarized light is reflected by the reflective layer 8, thereby changing its direction of rotation. Before the reflected circularly polarized light exits the composite disk 1, it passes through the λ / 4 retarder plate 8 again and is converted into p-polarized light. Since only p-polarized light exits the composite disk 1, the reflection is clearly visible even to a viewer wearing polarization-selective sunglasses.

[0116] Fig. 17 Figure 1 shows an enlarged section of a cross-section through a further embodiment of a projection arrangement 100 according to the invention, comprising a composite disk 1 and an image display device 10, with the beam path of the light emitted by the image display device 10 shown in more detail. The composite disk 1 is as shown in the Fig. 1 und 2 The image display device 10 emits circularly polarized light. This light first strikes the λ / 4 retarder plate 8, which converts it into p-polarized light, and then strikes the reflective layer 4. The p-polarized light is reflected by the reflective layer 4. Before the reflected p-polarized light leaves the composite disk 1, it passes through the λ / 4 retarder plate 8 again and is converted back into circularly polarized light. The circularly polarized light is also clearly visible to a viewer wearing polarization-selective sunglasses. Reference symbol list:

[0117] 1 Composite pane 2 Outer pane 3 Thermoplastic interlayer 4 Reflective layer 5 Opaque masking layer 6 Inner pane 7 Adhesive layer 8 λ / 4 Retarder plate 9 Coating 10 Image display device 100 Projection setup OTop edge UBottom edge KSide edge BProjection area HMain viewing area I. Outer surface of the outer pane 2 II. Inner surface of the outer pane 2 III. Outer surface of the inner pane 6 IV. Inner surface of the inner pane 6 X'-X section line ss-polarized light pp-polarized light c-circularly polarized light

Claims

1. A laminated pane (1) having a projection region (B), a main see-through region (H), an upper edge (O), a lower edge (U) and two lateral pane edges (K), at least comprising an outer pane (2), at least one thermoplastic intermediate layer (3), a reflective layer (4), an opaque masking layer (5), an inner pane (6), an adhesive layer (7), and a λ / 4 retardation plate (8), wherein the outer pane (2) has an outer-side surface (I) facing away from the at least one thermoplastic intermediate layer (3), and an interior-side surface (II) facing the at least one thermoplastic intermediate layer (3), and the inner pane (6) has an outer-side surface (III) facing the at least one thermoplastic intermediate layer (3), and an interior-side surface (IV) facing away from the at least one thermoplastic intermediate layer (3), the projection region (B) is arranged outside the main see-through region (H), the reflective layer (4) is arranged at least in the projection region (B) between the outer pane (2) and the inner pane (6), the opaque masking layer (5) is arranged at least in the projection region (B) between the outer pane (2) and the inner pane (6) and, when viewed through the laminated pane (1), is arranged spatially behind the reflective layer (4), starting from the interior-side surface (IV) of the inner pane (6), the λ / 4 retardation plate (8) is connected via the adhesive layer (7) to the interior-side surface (IV) of the inner pane (6) and is arranged in a region of the laminated pane (1) which, when viewed perpendicularly through the laminated pane (1), lies completely in the region in which the opaque masking layer (5) is arranged, and the projection region (B) lies completely in the region of the laminated pane (1) in which the λ / 4 retardation plate (8) is arranged, when viewed perpendicularly through the laminated pane (1).

2. The laminated pane (1) according to claim 1, wherein the reflective layer (4) is arranged substantially over the entire surface between the outer pane (2) and the inner pane (6).

3. The laminated pane (1) according to claim 1, wherein the reflective layer (4) is arranged between the outer pane (2) and the inner pane (6) in a region of the laminated pane (1) which, when viewed perpendicularly through the laminated pane (1), lies completely in the region in which the opaque masking layer (5) is arranged.

4. The laminated pane (1) according to any of claims 1 to 3, wherein the reflective layer (4) is arranged between the inner pane (6) and the at least one thermoplastic intermediate layer (3) or between the outer pane (2) and the at least one thermoplastic intermediate layer (3), or wherein the laminated pane (1) comprises at least two thermoplastic intermediate layers (3) and the reflective layer (4) is arranged between two of the thermoplastic intermediate layers (3).

5. The laminated pane (1) according to any of claims 1 to 4, wherein the adhesive layer (7) is a thermoplastic polymer layer or an optically clear adhesive.

6. The laminated pane (1) according to any of claims 1 to 5, wherein the projection region (B) is arranged adjacent to the lower edge (U) of the laminated pane (1).

7. The laminated pane (1) according to any of claims 1 to 6, wherein the opaque masking layer (5) is arranged at least partially in a peripheral edge region and, in particular in a portion which overlaps with the projection region (B), has a greater width than in portions different therefrom.

8. The laminated pane (1) according to any of claims 1 to 7, wherein the opaque masking layer (5) is designed as an opaque cover print on the interior-side surface (II) of the outer pane (2) or as an opaquely colored region of the at least one thermoplastic intermediate layer (3).

9. The laminated pane (1) according to any of claims 1 to 8, wherein the reflective layer (4) is designed as a reflective coating or as a reflective film.

10. The laminated pane (1) according to any of claims 1 to 9, additionally comprising a coating (9) which is designed as a protective coating or an antireflection coating and is arranged on the surface of the λ / 4 retardation plate (8) facing away from the adhesive layer (7).

11. A projection arrangement (100) at least comprising: - a laminated pane (1) according to any of claims 1 to 10, and - an image display device (10) which is directed toward the projection region (B) and is arranged in such a way that the interior-side surface (IV) of the inner pane (6) is the surface of the inner pane (6) closest to the image display device (10).

12. The projection arrangement (100) according to claim 11, wherein the image display device (10) is a projector or a display, preferably an LCD display, LED display, microLED display, OLED display or electroluminescent display, particularly preferably an LCD display, and the radiation preferably strikes the laminated pane (1) at an angle of incidence of 55° to 80°, particularly preferably of 62° to 77°.

13. The projection arrangement (100) according to claim 11 or 12, wherein the image display device (10) emits s-polarized light.

14. The projection arrangement (100) according to claim 11 or 12, wherein the image display device (10) emits circularly polarized light.

15. A use of a laminated pane (1) according to any of claims 1 to 10 as a vehicle pane in means of transport for traffic on land, in the air or on water, in particular in motor vehicles and in particular as a windshield for a head-up display.