Lighting device, especially for a motor vehicle

Abstract

The invention relates to a lighting device (105), particularly for a motor vehicle, especially configured to be assembled in an interior or exterior part of a motor vehicle, comprising in a stack: a support layer (20), a lighting structure (25) supported by the support layer (20) and comprising a guide sheet (110), particularly of a flexible type, comprising a film (111) made of a material having a refractive index (n1), this material being, for example, a polymer, the film (111) forming a core of the flexible guide sheet (110), the lighting structure (25) further comprising at least one integrated decorative element (70). Abstract Figure: Figure 2

Description

Title of the invention: Lighting device, particularly for a motor vehicle

[0001] The present invention relates in particular to a lighting device, in particular for a motor vehicle, in particular configured to be assembled in an interior or exterior part of a motor vehicle, preferably for a grille or a body part or any decorative part (roof part of passenger compartment or door part for example).

[0002] Patent application WO2024141675 discloses an external protection device, in particular in the form of a panel on a vehicle grille, configured to be mounted in front of an external sensor (for example a radar) of a vehicle, this external protection device comprising a heating and lighting device including, in a stack, a heating structure configured to melt any accumulation of frost, ice and / or snow in front of the sensor, and a lighting structure.

[0003] The present invention aims in particular to further improve the aesthetics of a lighting device.

[0004] The invention thus relates to a lighting device, particularly for a motor vehicle, specifically configured to be assembled in an interior or exterior part of a motor vehicle, comprising in a stack: - a support layer, - a luminous structure supported by the substrate layer and comprising a guide sheet, in particular of a flexible type, comprising a film (or guide core) in a material having a refractive index (ni), this material being for example a polymer, the film forming a core of the flexible guide sheet, a core in which light can propagate, this film being interposed between two optical sheaths (for example adhesive layers) of refractive indices (n2, n3) lower than the refractive index (ni) of the film material, this luminous structure further comprising at least one optical decoupling element configured to reflect or diffract or diffuse locally light propagating in the film outwards from the film into light-emitting zones, the luminous structure further comprising at least one integrated decorative element, - optionally a heating structure configured to melt any accumulation of frost, ice and / or snow in front of a sensor.

[0005] The light structure thus comprises, in addition to the guide rail, the integrated decorative element(s).

[0006] The guiding mat can be of the 3-layer type. For example, the film is sandwiched between two optical sheaths which may include an adhesive and / or a resin, in particular a resin which hardens after polymerization to also provide a protective function.

[0007] In the case of a 3-layer guide mat, the integrated decorative element is notably present after the optical duct, and not between the film and the optical duct.

[0008] The guide mat may exhibit visual transparency before implementation of the decorative element.

[0009] The guide mat may, alternatively, be of the 5-layer type, with, in addition to optical sheaths, mechanical protection layers. In this case, the integrated decorative element may be located between the optical sheath and a mechanical protection layer.

[0010] An "integrated" decorative element is defined as a decorative element that is produced directly on the light structure and before the assembly of the light structure within the light device, such that, during the integration of the light structure within the light device, with, for example, the support layer and optionally with a heating element, no tolerance or deviation in placement occurs between the decorative element(s) and the light-emitting areas of the light structure. Furthermore, advantageously, the integrated decorative element(s) can help to align the different parts of the stack that form the light device.

[0011] In general, the invention simplifies the decoration process while taking into account technical integration constraints. In particular, the invention proposes using the guide mat (which includes the guide film / core and the optical cladding) as a substrate / support for the decoration.

[0012] It is possible to foresee the case where the decorative element(s) are initially on another substrate, then laminated to the rest of the stack.

[0013] According to one aspect of the invention, the decorative element(s) are integrated within the stack of the guide sheet in the case where this stack comprises 5 layers (which includes the guide film / core, two optical sheaths and two mechanical protection layers).

[0014] According to one aspect of the invention, the light device exhibits transparency to radar electromagnetic waves (wavelength greater than 1 mm) and / or infrared waves (wavelength in the range of 800 nm to 1 mm) used by a sensor so that these electromagnetic waves can pass through the light device.

[0015] According to one aspect of the invention, the decorative element(s) are arranged on the emission side of the light emission zones.

[0016] In a way, in this case, the set element(s) are arranged above the film.

[0017] In this case, for example, the set element(s) are opaque and define one or more light passage zones at the right of the light emission zones of the film.

[0018] According to one aspect of the invention, the light passage zones at the right of the light emission zones of the film are areas left free of decorative elements.

[0019] For example, when the decorative element is a layer of paint or ink, this layer is absent in the light passage areas at the right of the light emission areas of the film.

[0020] For example, when the set element is a metallic deposit, this metallic deposit is absent in the light passage areas at the right of the light emission areas of the film.

[0021] It should be noted that it is simpler to create these light passage zones by printing / screen printing / deposition than, for example, by laser ablation of a layer.

[0022] In another embodiment of the invention, the decorative element(s) are arranged opposite the emission side of the light emission zones.

[0023] In a way, in this case, the set element(s) are arranged under the film.

[0024] In this case, the set element(s), being at the rear of the film, can be opaque, for example, formed by a layer of paint or ink, or a continuous metallic coating over the entire surface of the film. There is no need to provide areas for light transmission. When the set elements are at the rear of the film, it is possible to differentiate between the appearance of the set elements (off state) and the appearance of the device when it is on.

[0025] According to one aspect of the invention, the light structure includes decorative elements integrated on both opposite sides of the film.

[0026] When the light device is off, the decorative layer can be seen on at least one side of the film. When off, the decorative layer may have a colored metallic appearance.

[0027] The decor layer below the film can be seen through the light passage areas of the decor layer above the film.

[0028] According to one aspect of the invention, the decorative element is of the screen-printed type (with a mask) or of the direct deposit type or of the printing type (for example pad printing or inkjet printing).

[0029] According to one aspect of the invention, the decorative element forms a layer of paint or ink.

[0030] According to one aspect of the invention, the decorative element comprises a metallic deposit, in particular by vacuum deposition.

[0031] According to one aspect of the invention, the decorative element may be of a single color or have several colors, for example conferred by several different inks or paints.

[0032] According to one aspect of the invention, the decorative element may be a white layer that allows light to be reflected when the white layer is placed behind the light-emitting areas.

[0033] This increases the amount of light emitted.

[0034] In cases where the decorative element is a metallic coating or a white layer (on the back of the film), the invention advantageously increases the light extraction capacity. In this case, the invention provides good optical performance.

[0035] According to one aspect of the invention, the light structure may include different types of decorative elements (for example, a metallic deposit and a layer of paint).

[0036] According to one aspect of the invention, the decorative element is made in a single layer, for example a single layer of paint or metallization.

[0037] According to one aspect of the invention, the lighting device includes at least one protective layer, in particular made of polycarbonate (PC), or polymethyl methacrylate (PMMA), or silicone, this protective layer being in the form, for example, of a protective film.

[0038] According to one aspect of the invention, the protective layer is an end layer, on the top or bottom, of the stack of the luminous device.

[0039] According to one aspect of the invention, the lighting device comprises at least one adhesive layer (in particular forming one of the optical sheaths) which includes an optically transparent adhesive.

[0040] According to one aspect of the invention, the decorative element is in contact with the optical sheath.

[0041] According to one aspect of the invention, the lighting device comprises at least one layer of polyurethane, in particular transparent, which defines in particular a protective layer.

[0042] According to one aspect of the invention, the support layer is made of injected PC (Polycarbonate), or polypropylene (PP) or ABS or ABS-PC.

[0043] According to one aspect of the invention, the lighting device comprises an external face having a three-dimensional conformation, in particular being provided with a plurality of three-dimensional shapes (or 3D shapes).

[0044] This external face is notably accessible to touch by a person. This external face corresponds to the face on which the decorative elements are visible.

[0045] Three-dimensional conformation can further improve the aesthetics of the lighting device.

[0046] According to one aspect of the invention, the 3D outer face is formed by a protective layer.

[0047] According to one aspect of the invention, the light structure comprising the integrated decorative element(s) has a three-dimensional conformation that substantially follows the 3D conformation of the external face.

[0048] Alternatively, the light structure comprising the integrated decorative element(s) has a substantially flat shape.

[0049] According to one aspect of the invention, the luminous structure is placed under the protective layer which is transparent.

[0050] According to one aspect of the invention, the support layer has a three-dimensional conformation that substantially follows the 3D conformation of the outer face.

[0051] Alternatively, the luminous structure is placed above the protective layer which can be transparent or opaque (being for example colored).

[0052] In the invention, the manufacture of the light structure in 3D conformation is done without generating alignment problems between light emission zones and the decorative element(s) since these decorative elements are integrated into the light structure.

[0053] The invention also relates to an assembly, in particular a front end of a vehicle, with a lighting device as described above, and in particular a sensor.

[0054] The invention also relates to a motor vehicle comprising a front end assembly with a lighting device as described above, and in particular a sensor.

[0055] Other features, details and advantages of the invention will become apparent from the description given below by way of example in relation to drawings in which:

[0056] - Fig. 1 is a schematic representation of the front face of a vehicle automobile equipped with an external protective panel according to an example of an embodiment of the invention;

[0057] - Fig. 2 is a schematic, cross-sectional representation of the device luminous of the protective panel of the [Fig.l];

[0058] - Fig. 3 is a schematic, cross-sectional representation of a device luminous according to another example of an embodiment of the invention;

[0059] Fig. 4 is a schematic cross-sectional representation of a lighting device according to the invention, viewed from above.

[0060] Figure 1 shows a vehicle V with a front end assembly 100 comprising: - a 101 sensor, - an external protective element 102, in the form of a grille panel, placed in front of the sensor 101.

[0061] The sensor 101 can be a lidar (Light Detection and Ranging), namely a distance measurement device based on the analysis of the properties of a light beam reflected back to its emitter. Alternatively, the sensor 101 can be a radar, operating at a frequency between 76 and 81 gigahertz. For example, the sensor 101 can also be a visible or infrared camera.

[0062] The sensor 101 has an active area through which electromagnetic waves are emitted and / or received, the protective element 102, in the form of a grille panel, is placed in front of this active area of ​​the sensor 101.

[0063] The panel 102 includes fixing elements 135 of the panel 102 on the vehicle V, for example in the form of hooks.

[0064] In the example described, the panel 102 is solid, namely it does not have any holes or openings on its external face 106.

[0065] The panel 102 is part of a body of vehicle V, and can be curved or flat.

[0066] The panel 102, which can be curved or flat, extends between two front lights 107 of the vehicle, in a central area 108 of a front face 109 of the vehicle. The panel here is an element of the front grille of the vehicle V, a grille which is inserted vertically, between the hood and the bumper of the vehicle.

[0067] The panel 102 has a dimension measured along a direction L passing through the two front lights, which is at least 10 cm, or at least 50 cm, or at least 80 cm or 1 m.

[0068] As illustrated in [Fig. 2], the external protective element 102 comprises a lighting device 105 including, in a stacked arrangement: - a 20 support layer, - a luminous structure 25 supported by the support layer 20 and comprising a flexible guide sheet 110, including a film 111 made of a material having a refractive index ni, this material being, for example, a polymer, the film 111 forming a core of the flexible guide sheet 110, a core in which light can propagate, this film 111 being interposed between two optical sheaths 115.1 and 115.2, here adhesive layers, having refractive indices n2 and n3 respectively lower than the refractive index ni of the material of the film 111, this luminous structure 25 further comprising optical decoupling elements 113 configured to reflect, diffract, or locally scatter light propagating in the film 111 outwards from the film 111 in light emission zones 21, the light structure 25 still including integrated set elements 70, - optionally a heating structure (not shown) configured to melt any accumulation of frost, ice and / or snow in front of the sensor, this heating structure including for example a resistive layer arranged to produce heat when this layer is traversed by an electric current (the resistive layer being present on one face of a substrate, for example of textile, woven or knitted type, or of non-woven type).

[0069] The guide mat 110 may exhibit visual transparency before implementation of the decorative element 70.

[0070] An "integrated" decorative element is understood to be a decorative element 70 that is made directly on the light structure 25 and before the assembly of the light structure 25 within the light device 105 so that, during the integration of the light structure 25 within the light device 105, with, for example, the support layer 20 and optionally with a heating structure, no tolerance or deviation in placement appears between the decorative element(s) 70 and the light-emitting zones 21 of the light structure 25. Furthermore, advantageously, the integrated decorative element(s) 70 can help to align the different parts of the stack that form the light device 105.

[0071] In general, the invention simplifies the decoration process while taking into account technical integration constraints. In particular, the invention proposes using the guide mat 110 (which includes the film 111 (guide core) and the optical cladding) as a substrate / support for the decoration. The film 111 (guide core) has a thickness of between 50 and 1000 microns.

[0072] It is possible to foresee the case where the decorative element(s) 70 are initially on another substrate, then laminated to the rest of the stack.

[0073] The light device 105 exhibits transparency with respect to radar electromagnetic waves (wavelength greater than 1 mm) and / or infrared (wavelength in the range of 800 nm-1 mm) used by the sensor so that these electromagnetic waves can pass through the light device 105.

[0074] The decorative elements 70 are arranged on the emission side of the light emission zones 21, namely the decorative elements 70 are arranged above the film 111.

[0075] In this case, for example, the decorative elements 70 can be opaque and define one or more light passage zones at the right of the light emission zones 21 of the film 111.

[0076] The light passage zones opposite the light emission zones of film 111 are areas left free of decorative elements.

[0077] For example, when the decorative element 70 is a layer of paint or ink, this layer is absent in the light passage areas at the right of the light emission areas of the film 111.

[0078] For example, when the set element 70 is a metallic deposit, this metallic deposit is absent in the light passage areas opposite the light emission areas of the film 111.

[0079] It should be noted that it is simpler to create these light passage zones by printing / screen printing / deposition than, for example, by laser ablation of a layer.

[0080] The decorative element 70 is of the screen-printed type (with a mask) or of the direct deposit type or of the printing type (for example pad printing or inkjet printing).

[0081] For example, the decorative element 70 forms a layer of paint or ink.

[0082] For example, the decorative element 70 includes a metallic deposit, in particular by vacuum deposition.

[0083] The decorative element 70 may be of a single color or have several colors, for example conferred by several different inks or paints.

[0084] The decorative element 70 can be a white layer which allows light to be reflected when the white layer is placed behind the light-emitting areas 21. This allows the emitted light to be increased.

[0085] In the case where the decorative element 70 is a metallic deposit or a white layer (on the back of the film 111), the invention advantageously increases the light extraction capacity. In this case, the invention provides good optical performance.

[0086] The light structure 25 can include different types of decorative elements 70 (for example a metallic deposit and a layer of paint).

[0087] The decorative element 70 is made in a single layer, for example a single layer of paint or metallization.

[0088] The luminous device 105 includes two protective layers 112.1 and 112.2, in particular with a thickness of between 50 and 500 microns.

[0089] In the example described, the guide mat 110 is of the 5-layer type, with in addition to the film 111 and optical sheaths 115.1 and 115.2, mechanical protection layers 112.1 and 112.2. In this case, the integrated decorative element 70 can be between the optical sheath 115.1 and a mechanical protection layer 112.1.

[0090] The optical sheaths 115.1 and 115.2, which are adhesive layers (which include an optically transparent adhesive), in particular of a thickness between 5 and 150 microns, serve to bond the mechanical protection layers 112.1 and 112.2.

[0091] The luminous device 105 includes a transparent polyurethane layer 30, which is the outermost layer of the stack, in particular of thickness between 0.5 and 5 or 3 mm, in particular between 0.7 and 1 mm.

[0092] The support layer 20 is made of injected PC (Polycarbonate), being in particular 3 to 5 mm thick for a grille, or 2 to 4 mm thick for an interior passenger compartment part.

[0093] The film 111 is capable of receiving light rays through a light injection slice 114 and of reflecting the light rays in the direction along the Ox axis substantially perpendicular to the surface of the flexible guide sheet through the light emission zones 21 emitting the light.

[0094] A flexible guide sheet is defined as an optical guiding element in which one dimension is much smaller than the other two dimensions in space, for example, smaller by one or more orders of magnitude. Here, we consider a flexible guide sheet whose thickness along the Ox axis is at least two orders of magnitude smaller than its dimensions along the Oxy plane in which the flexible guide sheet 110 extends.

[0095] The film 111 comprises a set of optical decoupling elements 113 formed by microstructures on one face of the film 111 extending along the Oy axis. The microstructures 113 are capable of reflecting the light rays guided in the flexible film 111 away from the flexible guide sheet 110, in particular in a direction along the Ox axis perpendicular to the surface of the sheet 110.

[0096] The film is made of polycarbonate (PC), or polymethyl methacrylate (PMMA), or thermoplastic polyurethane (TUP), or polyethylene terephthalate (PET).

[0097] The flexible film 111 can have a thickness, namely the dimension along the Ox axis, of between 10 and 1000 µm. More precisely, the thickness of the flexible film 111 can be between 50 and 1000 µm, for example between 100 and 500 µm, preferably 150 µm. Alternatively, the flexible guide sheet 110 has a thickness of between 10 and 1000 µm. More precisely, the thickness of the flexible film 111 can be between 50 and 1000 micrometers, for example between 100 and 500 micrometers, preferably 150 µm.

[0098] The aforementioned materials, combined with a low thickness as described above, allow the production of a flexible and transparent film 111. Other materials may be used for the composition of the flexible film 111. However, according to the invention, it is preferable to use deformable and transparent materials.

[0099] The flexible guide sheet 110 further includes two protective layers 112.1 and 112.2, which provide mechanical protection to the flexible film 111. In addition, the protective layers 112.1 and 112.2 may include an anti-UV treatment, enabling the flexible film 110 to be protected against UV rays once The microstructures 113 have been etched. Without such UV protection, the pattern projected by the flexible guide sheet 110 is likely to degrade over time, especially when exposed to sunlight.

[0100] Since the guide sheet 110 is flexible, it is not necessarily contained in a plane but can be curved or shaped, depending on the position in which it is placed and the mechanical stresses applied to it.

[0101] The propagation of light rays in the flexible film 111 is done by total internal reflection thanks to the difference between the refractive index ni of the flexible film 111 and that n2, n3 of the adjacent layers 115.1 and 115.2.

[0102] In the illustrated example, the flexible film 111 is joined to the adjacent layers 112.1, 112.2 by gluing. Specifically, an adhesive layer 115.1, 115.2, here a layer of glue, is located between the flexible film 111 and each adjacent layer 112.1, 112.2, and this on both sides of the flexible film 111 to make the adjacent layers 112.1, 112.2 adhere to the flexible film 111.

[0103] The chosen adhesive is transparent and has a different refractive index than the flexible film so as to allow total internal reflection within the flexible film 111. In other words, due to the difference in refractive index, light rays propagating in the flexible film undergo total internal reflection upon encountering the interface between the flexible film and the adhesive layer at an angle of incidence lower than normal incidence. Thus, the guiding sheet 110 is capable of guiding light by total internal reflection, for example, from an input zone, here the slice 114, to an output zone.

[0104] The microstructures 113, for example, have a general bump-like shape, on which light rays are reflected in a direction along the Ox axis. Such microstructures 113 are suitable for causing the light rays exiting the flexible film 111 to form a pattern. To this end, the microstructures 113 are, for example, produced by ultraviolet printing, so as to reflect the light rays through the surface of the flexible film according to the desired pattern. For example, the microstructures 113 are distributed so as to extract homogeneous light over the entire surface of the flexible film 111. This is referred to as a homogeneous pattern in what follows.

[0105] Microstructures 113 are understood to be structures, or irregularities, of the flexible film, whose dimensions are notably less than a few micrometers. Microstructures thus also include nanometric structures. Such microstructure sizes 113 make it possible to ensure high transparency of the flexible film 111. In particular, a transparency of around 97% can be practically achieved by using microstructures 113.

[0106] A group 120 comprising one or more light injection elements 120.1 allows light L to be injected into the guide sheet 110. The group 120 is coupled with at least one light source so as to receive the light rays emitted by said source in each of the light injection elements.

[0107] In another embodiment of the invention illustrated in [Fig.3], the decorative elements 70 are arranged opposite the emission side of the light emission zones 21.

[0108] In a way, in this case, the scenery elements 70, for example belonging to a scenery layer, are arranged under the film 111.

[0109] In this case, the decorative elements 70, being at the rear of the film 111, can be opaque, for example, formed by a layer of paint or ink, or a continuous metallic coating over the entire surface of the film 111. There is no need to provide areas for light transmission. When the decorative elements 70 are at the rear of the film 111, it is possible to differentiate between the appearance of the decorative elements 70 (off appearance) and the appearance of the device when it is on.

[0110] In an unillustrated variant, the light structure 25 includes decorative elements 70 integrated on both opposite sides of the film 111.

[0111] When the light device 105 is off, it is possible to see the decoration layer on at least one side of the film 111. In the off state, the decoration may have a colored metallic appearance.

[0112] The decor layer below the film can be seen through the light passage areas of the decor layer above the film 111.

[0113] As can be seen in [Fig. 4], the lighting device 105 may have an external face 140 having a three-dimensional conformation, in particular being provided with a plurality of three-dimensional shapes (or 3D shapes). The 3D external face is formed by the polyurethane layer 30.

[0114] The external face 140 is, for example, formed of bosses, or grooves, or striations, arranged, for example, according to a regular or irregular pattern. Other reliefs can of course be envisaged.

[0115] This external face 140 is notably accessible to touch by a person. This external face corresponds to the face on which the decorative elements 70 are visible.

[0116] Three-dimensional conformation can further improve the aesthetics of the luminous device 105.

[0117] The light structure 25 comprising the integrated decorative elements 70 has a three-dimensional conformation which substantially follows the 3D conformation of the external face 140.

[0118] In an alternative (not shown), the light structure 25 including the integrated decorative elements 70 has a substantially flat shape.

[0119] The luminous structure 25 is placed under the polyurethane layer 30 which is transparent.

[0120] The support layer 20 has a three-dimensional conformation which substantially follows the 3D conformation of the outer face 140.

[0121] In the invention, the manufacture of the light structure 25 in 3D conformation is done without generating alignment problems between light emission zones 21 and the decorative elements 70 since these decorative elements are integrated into the light structure 25.

[0122] The light device 105 is here integrated into a grille. Alternatively, the light device 105 can be integrated into a body part or any decorative part, for example a roof panel or door panel.

Claims

Demands

1. A lighting device (105), particularly for a motor vehicle, particularly configured to be assembled in an interior or exterior part of a motor vehicle, comprising in a stack: - a support layer (20), - a lighting structure (25) carried by the support layer (20) and comprising a flexible guide sheet (110) comprising a film (111) in a material having a refractive index (ni), this material being for example a polymer, the film (111) forming a core of the flexible guide sheet (110), core in which light can propagate, this film (111) being interposed between two optical sheaths (115.1, 115.2) of refractive indices (n2, n3) lower than the refractive index (ni) of the film material (111), this luminous structure (25) further comprising at least one optical decoupling element (113) configured to reflect or diffract or diffuse locally light propagating in the film (111) to the outside of the film (111) in light emission zones (21), the luminous structure (25) further comprising at least one integrated decor element (70), - optionally a heating structure configured to melt any accumulation of frost, ice and / or snow in front of a sensor.

2. A lighting device according to the preceding claim, wherein the guide sheet (110) is of the 3-layer type, or of the 5-layer type with, in addition to optical sheaths, mechanical protection layers (112.1, 112.2).

3. A lighting device according to any one of the preceding claims, wherein the decorative element(s) (70) are integrated within the stack of the guide sheet (110) in the case where this stack comprises 5 layers which includes the film (111), two optical sheaths (115.1, 115.2) and two mechanical protection layers (112.1, 112.2).

4. A lighting device according to any one of the preceding claims, wherein the lighting device exhibits transparency to radar and / or infrared electromagnetic waves used by a sensor so that these electromagnetic waves can pass through the light device.

5. A lighting device according to any one of the preceding claims, wherein the decorative element(s) (70) are arranged on the emission side of the light emission zones.

6. A lighting device according to any one of claims 1 to 4, wherein the decorative element(s) (70) are arranged opposite the emission side of the light emission zones.

7. A lighting device according to any one of the preceding claims, wherein the lighting structure (25) includes integrated decorative elements (70) on both opposite sides of the film (111).

8. A lighting device according to any one of the preceding claims, wherein the decorative element (70) is of the screen-printed type or of the direct deposit type or of the printing type, and / or the decorative element (70) forms a layer of paint or ink.

9. A lighting device according to any one of the preceding claims, wherein the decorative element (70) comprises a metallic deposit, in particular by vacuum deposition.

10. A lighting device according to any one of the preceding claims, wherein the lighting structure (25) may include different types of decorative elements, for example a metallic deposit and a layer of paint.

11. A lighting device according to any one of the preceding claims, wherein the lighting device comprises at least one adhesive layer, in particular forming one of the optical sheaths, which includes an optically transparent adhesive.

12. A lighting device according to any one of the preceding claims, wherein the support layer (20) is made of injected PC (Polycarbonate), or polypropylene (PP) or ABS or ABS-PC.

13. A lighting device according to any one of the preceding claims, wherein the lighting device comprises an external face (140) having a three-dimensional conformation, in particular being provided with a plurality of three-dimensional shapes (or 3D shapes).

14. A lighting device according to the preceding claim, wherein the lighting structure (25) comprising the integrated decorative element(s) has a three-dimensional conformation that substantially follows the 3D conformation of the external face.

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