Image display system for a motor vehicle and motor vehicle with such an image display system

Abstract

The invention relates to an image display system (12) for a motor vehicle, comprising a projector (18) and a window arrangement (16) comprising a reflection layer (24) for reflecting light rays from the projector (18) and an absorption layer (26) for absorbing light rays from the projector (18). The absorption layer (26) has a plurality of spaced-apart light-absorbing lamellae (50). At least two of the light-absorbing lamellae (50) are at different distances from a respective adjacent light-absorbing lamellae (50) and / or at least two of the light-absorbing lamellae (50) have a different shape. The invention further relates to a motor vehicle having such an image display system (12).

Description

[0001] The present invention relates to an image display system for a motor vehicle, comprising a projector and a screen assembly. Furthermore, the present invention relates to a motor vehicle having such an image display system.

[0002] Image display systems for motor vehicles are known in various designs from the state of the art.

[0003] Known image display systems typically comprise a projector and a projection element on which the image projected by the projector can be displayed. The projection element has a reflective layer or a diffuse scattering layer and an absorption layer arranged behind the reflective layer, which absorbs light rays from the projector passing through the projection layer, thus preventing unwanted light from passing through the projection element. The known absorption layers are completely opaque.

[0004] It is therefore not possible to arrange the known image display systems in areas of a motor vehicle which are intended to ensure visibility for a motor vehicle occupant.

[0005] DE 10 2016 012 163 A1 discloses a windshield of a motor vehicle that includes louvres for shielding incident sunlight. US 2017 / 0 184 953 A1 and US 2017 / 0 336 704 A1 describe projection screens with louvre structures.

[0006] The object of the present invention is to provide an image display system for a motor vehicle that enables the imaging or display of an image projected by a projector on a projection element. At the same time, the unwanted passage of light rays through the projection element should be excluded or at least largely reduced, and the projection element should allow a motor vehicle occupant to see through the projection element, at least when viewed from a defined viewing angle. Furthermore, the object of the present invention is to provide a motor vehicle with such an image display system.

[0007] This object is achieved according to the invention by the image display system having the features of patent claim 1 and the motor vehicle having the features of patent claim 15.

[0008] According to the invention, an image display system for a motor vehicle is provided, comprising a projector and a pane arrangement. The pane arrangement has a reflective layer for reflecting light rays from the projector, which forms a projection element, and an absorption layer for absorbing light rays from the projector. The absorption layer has a plurality of light-absorbing lamellae, each of which is spaced apart by distances from respective adjacent light-absorbing lamellae. At least two of the distances between adjacent light-absorbing lamellae differ from one another and / or at least two of the light-absorbing lamellae have a different shape, in particular a different cross-sectional profile.

[0009] The core idea of the invention is therefore to provide a reflective layer and an absorption layer. While the projector's light rays are reflected on the reflective layer in such a way that the projected image can be displayed, the light-absorbing lamellae prevent or at least reduce unwanted passage of the light rays through the pane arrangement. Since the light-absorbing lamellae are spaced apart from one another, the absorption layer remains at least partially translucent or transparent when the pane arrangement is viewed from a defined viewing angle.Because at least two of the distances between adjacent light-absorbing lamellae differ from one another and / or at least two of the light-absorbing lamellae have a different shape, the absorption layer can be adapted in such a way that, with defined absorption, the maximum possible transparency through the pane arrangement is enabled.

[0010] For example, all light-absorbing slats are spaced at different distances from each other and / or all light-absorbing slats have different shapes.

[0011] The disc arrangement may comprise a first disc and / or a second disc.

[0012] The first pane can face an interior of the motor vehicle, thus forming an inner pane.

[0013] The second pane, for example, faces the surroundings of the motor vehicle, i.e. it forms an outer pane.

[0014] The reflection layer and the absorption layer are arranged, for example, between the first pane and the second pane, so that they form an intermediate layer.

[0015] The reflection layer can be a scattering layer which diffusely scatters light rays incident thereon in such a way that a projected image can be displayed.

[0016] In an exemplary embodiment of the image display system according to the invention, the spacings and / or shapes of the light-absorbing slats are directly or indirectly proportional to distances of the light-absorbing slats from the projector and / or directly or indirectly proportional to angles of incidence at which the light rays of the projector strike the light-absorbing slats.

[0017] In a preferred embodiment of the image display system according to the invention, light rays from the projector which pass through the reflection layer and extend in particular towards a motor vehicle environment can be absorbed by means of the light-absorbing lamellae.

[0018] In an exemplary embodiment of the image display system according to the invention, light rays from the projector can be reflected by the reflective layer in such a way that a projected image can be displayed. The reflective layer thus serves to decouple the image projected by the projector and thus forms a projection element.

[0019] In a preferred embodiment of the image display system according to the invention, the light-absorbing slats are further away from adjacent light-absorbing slats, ie a distance between adjacent light-absorbing slats is greater the further the light-absorbing slats are away from the projector.

[0020] The distance between adjacent light-absorbing slats may be directly proportional to a distance of the light-absorbing slats from the projector.

[0021] In an exemplary embodiment of the image display system according to the invention, the light-absorbing slats are further away from adjacent light-absorbing slats, the smaller an angle of incidence of the light rays of the projector incident on the light-absorbing slats is.

[0022] The distance between adjacent light-absorbing slats can be indirectly proportional to the angle of incidence of the projector's light rays striking the light-absorbing slats.

[0023] The angle of incidence is the angle enclosed by an incident light beam and a normal of incidence.

[0024] The normal of incidence is a perpendicular or orthogonal line on the surface onto which the light beam strikes, in particular at the point where the incident light beam hits the surface or at which a reflected light beam leaves the surface.

[0025] The light-absorbing slats extend vertically, for example. The incident light line extends horizontally.

[0026] In a preferred embodiment of the image display system according to the invention, an extension of the light-absorbing slats in the vertical direction of the pane arrangement, i.e. a height of the light-absorbing slats, is smaller the further the light-absorbing slats are away from the projector.

[0027] In a preferred embodiment of the image display system according to the invention, an extension of the light-absorbing slats in the vertical direction of the pane arrangement is smaller, the smaller an angle of incidence of the light rays of the projector striking the light-absorbing slats is.

[0028] In a preferred embodiment of the image display system according to the invention, the extension of the light-absorbing lamellae in the vertical direction of the pane arrangement is between 0.3 mm and 0.5 mm.

[0029] The light-absorbing slats can extend vertically, i.e. in the vertical direction of the disc arrangement, or can be inclined, in particular starting from a vertical in the direction of the projector, i.e. around an axis extending in the horizontal direction.

[0030] The absorption layer extends, for example, in the transverse direction and / or longitudinal direction such that a maximum of a defined amount of light rays from the projector, in particular to the side of the absorption layer, passes through the pane arrangement, in particular without being absorbed by the absorption layer, i.e. unhindered.

[0031] An extension of the absorption layer in the transverse direction and / or longitudinal direction is therefore dependent, for example, on a permeability of the pane arrangement for the light rays of the projector and / or a position of the projector relative to the pane arrangement, in particular on a maximum angle of incidence at which light rays of the projector strike the pane arrangement.

[0032] In a preferred embodiment of the image display system according to the invention, the projector is arranged on a side of the reflection layer facing away from the absorption layer. The light rays from the projector thus first strike the reflection layer before a portion of the light rays that pass through the reflection layer, i.e., are not reflected by the reflection layer, particularly toward an interior of the motor vehicle, are absorbed by the absorption layer.

[0033] For example, the projector is arranged at a distance from the disc arrangement.

[0034] The projector may be located on a bottom side of the first disc.

[0035] When the image display system is installed in a motor vehicle in a functionally correct manner, the first pane faces, for example, an interior of the motor vehicle. The first pane thus forms, for example, an inner pane.

[0036] In a preferred embodiment of the image display system according to the invention, the pane arrangement, in particular the absorption layer, is at least partially, in particular completely, transparent when viewed from a defined viewing angle, in particular from -45° to +45°. This allows for a view through the pane arrangement.

[0037] The viewing angle refers to an angle enclosed by a light beam emanating from the pane arrangement and incident on the eye of an observer, in particular a vehicle occupant, and a normal of the pane arrangement. The normal of the pane arrangement extends orthogonally to the pane arrangement, in particular the transverse plane of extension of the pane arrangement, and in particular intersects a point at which the light beam emanating from the pane arrangement and incident on the eye of an observer leaves the pane arrangement.

[0038] For example, the pane arrangement, in particular the absorption layer, is opaque or impermeable when the pane arrangement is viewed at a viewing angle that exceeds the defined viewing angle, in particular at a viewing angle of less than - 45° and / or greater than + 45°.

[0039] In an exemplary embodiment of the image display system according to the invention, the light-absorbing lamellae extend in the vertical and transverse directions of the pane arrangement and / or in the vertical and longitudinal directions of the pane arrangement.

[0040] The slats may have a V-shaped profile in a plan view of the disc arrangement or may extend linearly.

[0041] For example, the open side of the V-shaped profile faces the projector.

[0042] The slats have, for example, a rectangular or trapezoidal cross-sectional profile, in particular when cut in the vertical and transverse directions of the pane arrangement or in the vertical and longitudinal directions of the pane arrangement.

[0043] In a preferred embodiment of the image display system according to the invention, the absorption layer comprises transparent regions which in particular connect adjacent light-absorbing lamellae to one another.

[0044] The transparent areas are made of plastic, for example.

[0045] In an exemplary embodiment of the image display system according to the invention, the first pane is connected to the reflection layer via a first connection layer, the reflection layer is connected to the absorption layer via a second connection layer and / or the absorption layer is connected to the second pane via a third connection layer.

[0046] In a preferred embodiment of the image display system according to the invention, the first connecting layer, the second connecting layer and / or the third connecting layer are / is formed from plastic and / or a hot melt adhesive.

[0047] For example, the first bonding layer, the second bonding layer and / or the third bonding layer are / is made of polyvinyl butyral (PVB) or thermoplastic polyurethane (TPU).

[0048] The pane arrangement may be a composite pane.

[0049] The first pane and / or the second pane comprise, for example, glass or plastic.

[0050] The plastic can be or comprise polycarbonate (PC) and / or polymethyl methacrylate (PMMA).

[0051] In an exemplary embodiment of the image display system according to the invention, the pane arrangement is a roof pane, in particular a panoramic roof pane, of a motor vehicle or forms a partial region of the roof pane.

[0052] The pane arrangement can be a windscreen of a motor vehicle or form a portion of the windscreen.

[0053] For example, the window arrangement is a side window of a motor vehicle or forms a part of the side window.

[0054] In a preferred embodiment of the image display system according to the invention, the projector is arranged relative to the pane arrangement such that an angle of incidence of the light rays onto the light-absorbing slats is less than 90°, preferably less than 45°, more preferably less than 35°.

[0055] The reflective layer is, for example, a film, a print or a coating.

[0056] The reflection layer can be arranged on the same side of the first pane as the absorption layer or on the opposite side of the first pane, which in particular faces an interior of the motor vehicle.

[0057] For example, the absorption layer is an extrudate or a print.

[0058] The absorption layer can be produced by a rolling process.

[0059] The reflection layer and / or absorption layer can be a lamination film.

[0060] The disc arrangement may comprise at least one functional layer.

[0061] The functional layer is, for example, a switchable layer or a light-guiding layer.

[0062] The functional layer may form an additional layer of the pane arrangement or be integrated into one of the layers of the pane arrangement described above, in particular in the first pane or the second pane.

[0063] For example, the first pane and / or the second pane are / is a light-guiding layer on which, in particular, a light-outcoupling structure or a light-outcoupling pattern is arranged.

[0064] The light extraction structure or pattern is, for example, an extraction print.

[0065] Furthermore, the present invention provides a motor vehicle with an image display system as described above.

[0066] The invention is explained in more detail below with reference to an embodiment illustrated in the drawing. It shows: Fig. 1 is a plan view of a portion of a motor vehicle comprising a composite window assembly according to the invention; Fig. 2 a sectional view through a pane arrangement of the composite pane arrangement according to the invention along line II-II in Fig. 1; Fig. 3 a Fig. 2 corresponding view together with a projector of the composite pane arrangement according to the invention and a schematic representation of light rays; Fig. 4 a sectional view through a reflective layer of the pane arrangement together with a schematic representation of a viewing angle; and Fig. 5 a sectional view through an absorption layer of the disc arrangement together with a schematic representation of angles of incidence.

[0067] In Fig. 1 shows a motor vehicle roof 10 of a motor vehicle according to the invention. The motor vehicle roof 10 comprises an image display system 12 with a pane assembly 16 and a projector 18. The pane assembly 16 forms a roof pane of the motor vehicle, in particular a panoramic roof pane, and is rigidly or immovably connected to a roof frame 14 of the motor vehicle roof 10, which is fixed to the body.

[0068] Deviating from the Fig. 1, it is also conceivable that the window arrangement 16 is a windscreen of a motor vehicle or a partial area of a windscreen.

[0069] Fig. Figure 2 shows a sectional view through the pane assembly 16 of the image display system 12 according to the invention. The pane assembly 16 is a composite pane. Fig. 2 and Fig. 3, however, the disc assembly 16 is shown in a non-connected state.

[0070] As can be seen from the sectional view in Fig. 2, the pane arrangement 16 comprises, stacked one above the other in the following row, a first pane 20 forming an inner pane, which faces an interior of the motor vehicle, a first connecting layer 28, a reflection layer 24, a second connecting layer 30, an absorption layer 26, a third connecting layer 32 and a second pane 22 forming an outer pane, which faces a motor vehicle exterior or a motor vehicle environment.

[0071] The first connecting layer 28, the second connecting layer 30 and the third connecting layer 32 are each plastic adhesive layers.

[0072] The reflection layer 24 is formed from a light-reflecting material. As can be seen in particular from the Fig. As can be seen from the sectional view of the image display system 12 according to the invention shown in Fig. 3, the reflection layer 24 can thus reflect light rays 36 of the projector 18 in such a way that an image to be projected is imaged, in particular in the form of reflected light rays 38 which reach the eye of a motor vehicle occupant.

[0073] The absorption layer 26 comprises transparent regions 44 and light-absorbing lamellae 50. The light-absorbing lamellae 50 extend in the vertical and longitudinal directions of the pane arrangement 16 and are connected to one another via the transparent regions 44, which are formed in particular from a transparent plastic.

[0074] Deviating from the embodiment shown, it is also conceivable to arrange the light-absorbing slats 50 such that they extend in the vertical direction and transverse direction of the pane arrangement 16.

[0075] A portion of the light rays 36 of the projector 18 passes through the reflection layer 24. This means that a portion of the light rays 36 of the projector 18 is not reflected by the reflection layer 24 in the direction of the interior of the motor vehicle, but passes through the reflection layer 24.

[0076] The light rays 40 passing through the reflection layer 24 hit with an angle of incidence α1, α i on the light-absorbing slats 50. As can be seen from Fig. 5, the angle of incidence α1, α ian angle enclosed by an incident light beam passing through the reflective layer 24 and a normal line 42. The normal line 42 is a normal line or an orthogonal line on the surface onto which the light beam 40 impinges, in particular at the point at which the incident light beam impinges on the surface or at which a reflected light beam leaves the surface, in this case a surface of a respective one of the light-absorbing lamellae 50 facing the projector.

[0077] As is particularly evident from Fig. 5, the angle of incidence α1, α i with which the light beam 40 hits the light-absorbing slats 50, the smaller the further the light-absorbing slats 50 are from the projector 18. This makes it possible to set a distance d1, d3, d nbetween adjacent light-absorbing slats 50, the further they are away from the projector 18, and still ensure sufficient absorption of the light rays 40.

[0078] In contrast to the configuration of the absorption layer 26 shown in the figures, this also makes it possible to ensure sufficient absorption of the light rays 40 by the light-absorbing slats 50, even if light-absorbing slats 50 further away from the projector are configured with a smaller height h, i.e., extending in a direction orthogonal to a transverse plane of extension of the pane arrangement 12. In particular, the height h of the light-absorbing slats 50 can decrease with increasing distance from the projector 18, in particular continuously.

[0079] Because the light-absorbing slats 50 are spaced apart from one another, i.e. the transparent regions 44 are provided between the light-absorbing slats 50, the absorption layer 26 is translucent or transparent when viewing the pane arrangement 16 at a defined viewing angle β, in particular when viewed at a defined viewing angle β between -45° and +45°.

[0080] The defined viewing angle β denotes an angle enclosed by a viewing direction 46, with which an observer views the pane arrangement 12, or by a light beam emanating from the pane arrangement 12 and incident on an eye 34 of the observer, and a normal 48 of the pane arrangement 12. The normal 48 is an orthogonal of the pane arrangement 12, which extends in particular perpendicular to the transverse plane of extension of the pane arrangement 12.

[0081] If, as in Fig.5, a distance d1, d3, d n of the light-absorbing slats 50 increases with increasing distance of the light-absorbing slats 50 from the projector 18, the viewing angle β at which the absorption layer 26 is transparent also increases.

[0082] If the defined viewing angle β is exceeded, it is not possible to see through the absorption layer 26. When viewing the pane arrangement 16 at a viewing angle β greater than the defined viewing angle β, the absorption layer 26 is opaque or non-transparent due to the light-absorbing lamellae 50. List of reference symbols: 10 Vehicle roof 12 Image display system 14 roof frames 16 disc arrangement 18 projector 20 first disc 22 second disc 24 reflective layer 26 Absorption layer 28 first connection layer 30 second connection layer 32 third connection layer 34 Eye 36 light beams of the projector 38 reflected light beam 40 Reflection layer passing light beam of the projector 42 Invention slot 44 transparent areas 46 Viewing direction 48 lots 50 light-absorbing slats d1 Distance between adjacent light-absorbing slats d3 Distance between adjacent light-absorbing slats d n Distance between adjacent light-absorbing slats h Height of the light-absorbing slats α1 angle of incidence α i Angle of incidence β Viewing angle

Claims

[1] Image display system for a motor vehicle, comprising a projector (18) and a window assembly (16) comprising a reflection layer (24) for reflecting light rays from the projector (18) and an absorption layer (26) for absorbing light rays from the projector (18), characterized by that the absorption layer (26) has a plurality of spaced-apart light-absorbing lamellae (50), wherein at least two of the light-absorbing lamellae (50) are at different distances from a respective adjacent light-absorbing lamellae (50) and / or at least two of the light-absorbing lamellae (50) have a shape that differs from one another. [2] Image display system according to claim 1, characterized by that the distances (d1, d3, d n) and / or the shapes of the light-absorbing slats are directly or indirectly proportional to distances of the light-absorbing slats from the projector (18) and / or directly or indirectly proportional to angles of incidence at which the light rays of the projector (18) strike the light-absorbing slats (50). [3] Image display system according to claim 1 or 2, characterized by that light rays (40) of the projector (18) which pass through the reflection layer (24) can be absorbed by means of the light-absorbing lamellae (50). [4] Image display system according to one of claims 1 to 3, characterized by that light rays (36) of the projector (18) can be reflected by means of the reflection layer (24) in such a way that a projected image can be displayed. [5] Image display system according to one of claims 1 to 4, characterized bythat the light-absorbing lamellae (50) are further away from adjacent light-absorbing lamellae (50), the further the light-absorbing lamellae (50) are away from the projector (18) and / or the smaller an angle of incidence (α1, α i ) of the light rays (40) of the projector (18) striking the light-absorbing slats (50). [6] Image display system according to one of claims 1 to 5, characterized by that an extension (h) of the light-absorbing slats (50) in the vertical direction of the pane arrangement (16) is smaller, the further the light-absorbing slats (50) are away from the projector (18) and / or the smaller an angle of incidence (α1, α i ) of the light rays (40) of the projector (18) striking the light-absorbing slats (50). [7] Image display system according to one of claims 1 to 6, characterized bythat an extension (h) of the light-absorbing lamellae (50) in the vertical direction of the pane arrangement (16) lies in a range of 0.3 mm to 0.5 mm. [8] Image display system according to one of claims 1 to 7, characterized by that the projector (18) is arranged on a side of the reflection layer (24) facing away from the absorption layer (26). [9] Image display system according to one of claims 1 to 8, characterized by that the pane arrangement (16) is transparent when viewed at a defined viewing angle (β), in particular in the viewing angle range of - 45 ° and + 45 °, and in particular is otherwise opaque. [10] Image display system according to one of claims 1 to 9, characterized by that the light-absorbing slats (50) each extend in the vertical direction and transverse direction of the pane arrangement (16) and / or in the vertical direction and longitudinal direction of the pane arrangement (16). [11] Image display system according to one of claims 1 to 10, characterized by that the absorption layer (26) comprises transparent regions (44) which connect the light-absorbing lamellae (50) to one another. [12] Image display system according to one of claims 1 to 11, characterized by a first pane (20) which is connected to the reflection layer (24) via a first connecting layer (28), the reflection layer (24) is connected to the absorption layer (26) via a second connecting layer (30) and / or the absorption layer (26) is connected to a second pane (22) via a third connecting layer (32). [13] Image display system according to one of claims 1 to 12, characterized by that the window arrangement (16) is a roof window, in particular a panoramic roof window, of the motor vehicle, a windscreen of the motor vehicle or a side window of the motor vehicle. [14] Image display system according to one of claims 1 to 13, characterized by that the projector (18) is arranged relative to the disc arrangement (16) such that an angle of incidence (α1, α i ) of the light rays onto the light-absorbing lamellae (50) is less than 90°, preferably less than 45°, more preferably less than 35°. [15] Motor vehicle, characterized by an image display system (12) according to one of claims 1 to 14.

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