Lighting device, particularly for motor vehicles

Abstract

Title: Lighting device, in particular for a motor vehicle The subject of the invention is a lighting device (100) comprising, in a stack: a light structure (1) arranged to emit light, a light emission network (10) comprising a set of emission patterns (11) through which the light from the light structure (1) is emitted, a light transmission network (3) comprising a set of transmission patterns (33) through which the light emitted by the emission network (10) passes, in which the emission network (10) and the transmission network (3) have spatial distributions chosen to break up spatial interference due to the stacking of the emission and transmission networks. Figure for the abstract: Fig. 1

Description

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

[0001] The field of the present invention is that of lighting devices, in particular for motor vehicles.

[0002] Heating panels are known which comprise a plurality of electrodes configured to deliver heat by Joule effect by supplying electric current to a conductive coating. For example, reference may be made to document US2016 / 0059669.

[0003] Furthermore, it is known to use lighting devices in the passenger compartment of motor vehicles. These interior lighting devices are increasingly in demand by car manufacturers.

[0004] In certain types of lighting devices, when two periodic structures having close spatial frequencies are superimposed, a Moiré effect is observed. Such a Moiré effect is observed when seeking to backlight an automobile decoration surface by associating in particular at least two elements among: - a micro-structured light guide and a perforated decorative surface or textile, - a light guide with a perforated radiant heating panel, - a perforated radiant heating panel with a perforated decorative surface or textile.

[0005] The Moiré effect is triggered by the superposition of two periodic structures. With three periodic structures, the Moiré effect is also present.

[0006] The spatial interference between the patterns of these superimposed structures causes a Moiré effect that we wish to avoid.

[0007] The invention aims in particular to avoid this Moiré effect on superimposed structures.

[0008] The invention thus relates to a lighting device comprising, in a stack: - a light structure designed to emit light, - a light emission network comprising a set of emission patterns through which the light from the light structure is emitted, - a light transmission network comprising a set of transmission patterns through which the light emitted by the emission network passes, - in which the transmission network and the transmission network have spatial distributions chosen to break spatial interference due to the stacking of the transmission and transmission networks.

[0009] By spatial distribution is meant here the spatial distribution of the emission patterns within the emission network, and the spatial distribution of the transmission patterns within the transmission network.

[0010] By spatial interference is meant here the superposition of the emission patterns of the emission network and the superposition of the transmission patterns caused by the stacking of said networks.

[0011] According to one aspect of the invention, at least one of the transmission network or the emission network comprises emission patterns or transmission patterns following a periodic distribution, and the other of the transmission network or the emission network comprises emission patterns or transmission patterns following an aperiodic distribution chosen to break spatial interference due to the stacking (or superposition) of the emission and transmission networks.

[0012] By periodic distribution, it is meant here that the patterns of the network are arranged with regular spacings between them. By aperiodic distribution, it is meant here that the patterns of the network are arranged with spacings which vary according to the pairs of patterns considered. In other words, two neighboring patterns two by two are arranged with spacings which vary. By aperiodic, it is meant here an at least partial absence of periodicity of the network.

[0013] When at least one of the networks comprises a set of patterns distributed in two dimensions, the network comprises a fictitious reference point associated with each pattern, and each pattern is spaced from the reference point associated with it by a random distance and / or angle following a statistical distribution curve (for example a Gaussian curve). When at least one of the networks comprises a set of patterns distributed according to one dimension, the network comprises a fictitious reference point associated with each pattern, and each pattern is spaced from the reference point by a random distance following a statistical distribution curve. In other words, each pattern is arranged according to a spatial offset relative to the reference point associated with it. The statistical distribution curve may be a Gaussian curve or may have a random component, regardless of its statistical distribution law (or probability law).

[0014] According to one aspect of the invention, the light structure forms the light emission network. For example, the light structure comprises a light guide with light extraction microstructures which form the light emission network. In this case, the light emission network is in particular distinct from primary light sources.

[0015] In the present invention, the light emission network is understood in particular as defining a first light emission surface, and does not necessarily comprise one or more light sources.

[0016] The invention thus makes it possible to provide a lighting device in which the pattern networks avoid the Moiré effect, by adding a random component in the network of at least one of the structures.

[0017] In one aspect according to the invention, the lighting device comprises a heating structure arranged to produce heat.

[0018] In one aspect according to the invention, the lighting device comprises a decoration.

[0019] In one aspect according to the invention, the lighting device comprises a mask emission arranged to form, with the light structure, the light emission network, said emission mask being in particular attached to the light structure.

[0020] According to one aspect of the invention, the mask is made of a material which at least partially blocks the light coming from the luminous structure and comprises openings to allow this light to pass through according to the emission patterns provided by these openings.

[0021] In one aspect according to the invention, the mask is formed by the heating structure. In other words, the emission patterns are arranged on the heating structure through which the light from the light structure attached to the heating structure is emitted. In other words, the heating structure comprises the light emission patterns arranged for the emission of the light emitted by the light structure, and areas arranged to absorb the light emitted by the light structure. The emission mask function is played by the heating structure.

[0022] In one aspect according to the invention, the emission mask is arranged between the luminous structure and the heating structure. In other words, the emission mask function is performed by a structure having no other functions.

[0023] In one aspect according to the invention, the lighting device comprises a transmission mask arranged to form the light transmission network.

[0024] In one aspect according to the invention, a transmission mask is formed by the decoration. In other words, the transmission patterns are arranged on the decoration through which the light emitted by the emission grating is emitted. In other words, the decoration comprises the light transmission patterns arranged to allow the transmission of the light emitted by the light emission grating, and areas arranged to absorb the light emitted by the light emission grating.

[0025] In one aspect according to the invention, the transmission mask is formed by the heating structure. In other words, the transmission patterns are arranged on the heating structure through which the light emitted by the emission grating is transmitted. In other words, the heating structure comprises the transmission patterns light arranged to allow the transmission of light emitted by the light emitting network, and areas arranged to absorb the light emitted by the light emitting network.

[0026] In one aspect according to the invention, the transmission mask is arranged between the luminous structure and the decoration, more particularly between the heating structure and the decoration.

[0027] In one aspect according to the invention, the lighting device comprises at least two light emission networks, in particular a light emission network formed by the heating structure, and a light emission network formed by the light structure, and / or a network formed by the stacking of the light structure and an emission mask arranged between the heating structure and the light structure.

[0028] In one aspect according to the invention, the lighting device comprises at least two light transmission networks, in particular a light transmission network formed by the heating structure and a network formed by the decoration, and / or a network formed by the stacking of a transmission mask and the heating structure or the decoration, said transmission mask being arranged between the light structure and the decoration.

[0029] In one aspect according to the invention, the transmission patterns have a shape chosen from a polygon, a circle, a disc, an oval, an ellipse, a line.

[0030] In one aspect according to the invention, the emission patterns have a shape chosen from a polygon, a circle, a disc, an oval, an ellipse, a line.

[0031] In one aspect according to the invention, the transmission patterns and the emission patterns have the same shape.

[0032] In one aspect of the invention, the transmission patterns and the emission patterns have a different shape.

[0033] In one aspect according to the invention, the at least one transmission network comprises transmission patterns distributed periodically, and the at least one transmission network comprises transmission patterns distributed aperiodically.

[0034] According to one aspect of the invention, the lighting device comprises a functional face towards which the light produced by the light structure can be sent, this functional face being configured to diffuse the light thus received towards the outside of the lighting device, for example towards an area of ​​a vehicle interior.

[0035] According to one aspect of the invention, the functional face is thus a face of the lighting device on which the lighting function is manifested, for example to illuminate an area of ​​this passenger compartment or to create a light effect visible from the passenger compartment.

[0036] According to one aspect of the invention, the heating and lighting structures form stacked layers.

[0037] According to one aspect of the invention, the lighting device has a panel shape.

[0038] According to one aspect of the invention, the lighting device is flexible, namely it can be shaped to take a predetermined shape.

[0039] According to one aspect of the invention, the lighting device comprises a decoration visible from inside the passenger compartment, this decoration being for example a covering of the passenger compartment, such as for example a fabric, a leather or an aesthetic covering.

[0040] According to one aspect of the invention, the heating structure, the light structure and the decoration form stacked layers.

[0041] The lighting device according to the invention thus makes it possible to perform, in addition to the heating and lighting functions, a decorative function, for example with a predetermined leather or fabric zone, visible from the passenger compartment.

[0042] According to one aspect of the invention, the light structure comprises a light engine.

[0043] According to one aspect of the invention, the light engine is an electronic device, in particular a printed circuit device, comprising one or more LEDs (light-emitting diodes) and at least one light guide for guiding the light emitted by the LED(s).

[0044] According to one aspect of the invention, the light guide of the light engine comprises a plate in which light can propagate, this plate comprising at least one light emission face.

[0045] According to one aspect of the invention, the plate has, at least locally, a planar shape, and the light-emitting face is, at least locally, planar.

[0046] According to one aspect of the invention, the plate has a complex shape different from a flat shape.

[0047] According to one aspect of the invention, the light guide plate extends along a curved surface.

[0048] In another aspect according to the invention, the light structure comprises a flexible guide sheet comprising a film in a material having a refractive index, this material being for example a polymer, the film forming a core of the flexible guide sheet, core in which the light can propagate, this film being interposed between two layers of materials with refractive indices lower than the refractive index of the material of the film, this light structure further comprising at least one optical decoupling element configured to locally reflect or diffract light propagating in the film towards the outside of the film.

[0049] The term "flexible guide sheet" means that the flexible guide sheet can deform to take a predetermined shape. For example, when the flexible guide sheet is placed on a curved surface (for example curved), its deformation allows it to fit this curved surface. The flexible guide sheet has a small thickness such that its flexibility / flexibility property is preserved.

[0050] According to one aspect of the invention, the flexible guide sheet has a light emission face emitting the light extracted by the optical decoupling element(s).

[0051] In one aspect according to the invention, the optical decoupling elements are formed from microstructures.

[0052] According to one aspect of the invention, the optical decoupling element(s) are transparent in the absence of light guided in the flexible guide sheet.

[0053] According to one aspect of the invention, the optical decoupling element(s) are configured to reflect the light directionally, in particular at an angle substantially perpendicular to the emission face of the flexible guide sheet.

[0054] According to one aspect of the invention, a plurality of optical decoupling elements are produced on the film forming the core of the flexible guide sheet.

[0055] According to one aspect of the invention, the optical decoupling elements are integrated into the film.

[0056] In one aspect according to the invention, the film is made of polycarbonate (PC), or polymethyl methacrylate (PMMA), or thermoplastic polyurethane (TUP), or polyethylene terephthalate (PET).

[0057] The invention also relates to a vehicle comprising a passenger compartment, said passenger compartment comprising said at least one lighting device as mentioned above.

[0058] In one aspect according to the invention, the vehicle comprises a front end module, said front end module comprising the lighting device as mentioned above.

[0059] Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows on the one hand, and several exemplary embodiments given for informational and non-limiting purposes with reference to the appended schematic drawings on the other hand, in which:

[0060] [Fig.l] [Fig.l] is a sectional representation of a lighting device according to an exemplary embodiment of the invention;

[0061] [Fig.2] [Fig.2] a sectional representation of a lighting device according to a another example of embodiment of the invention;

[0062] [Fig.3] [Fig.3] is a sectional representation of a lighting device according to yet another example of an embodiment of the invention;

[0063] [Fig.4] [Fig.4] is a representation of the transmission network of the device lighting of [Fig.l];

[0064] [Fig.5] [Fig.5] is a representation of the transmission network 10 according to another exemplary embodiment of the invention;

[0065] [Fig.6] [Fig.6] is a representation of the transmission network of the device lighting of [Fig.l];

[0066] [Fig.7] [Fig.7] is a schematic representation of a heating structure of the lighting device of [Fig.2];

[0067] [Fig.8] [Fig.8] is a schematic representation of a light structure of the lighting device of [Fig.l].

[0068] The features, variants and different embodiments of the invention may be combined with each other, in various combinations, provided that they are not incompatible or mutually exclusive. In particular, variants of the invention may be imagined comprising only a selection of features described below in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from the prior art.

[0069] [Fig. 1] shows a lighting device 100 according to an exemplary embodiment of the invention, comprising, in a stack: - a light structure 1 arranged to emit light, - a light emission network 10 comprising a set of patterns emission 11 through which the light from the light structure 1 is emitted, as illustrated in [Fig.4], - a light transmission network 3 comprising a set of transmission patterns 33 through which the light emitted by the light emission network 10 passes, as illustrated in [Fig.6].

[0070] The transmission network 10 and the transmission network 3 have spatial distributions chosen to break spatial interference due to the stacking of the transmission networks 10 and transmission networks 3.

[0071] By spatial distribution is meant here the spatial distribution of the emission patterns 11 within the emission network 10, and the spatial distribution of the transmission patterns 33 within the transmission network 3.

[0072] By spatial interference is meant here the superposition of the emission patterns 11 of the emission network 10 and the superposition of the transmission patterns 33 caused by the stacking of said emission networks 10 and transmission networks 3.

[0073] In the invention, at least one of the transmission network 3 or the transmission network 10 comprises transmission patterns or transmission patterns according to a periodic distribution, and the other of the transmission network 3 or the emission network 10 comprises emission patterns or transmission patterns following an aperiodic distribution chosen to break spatial interferences due to the stacking (or superposition) of the emission and transmission networks.

[0074] In the example described, it is the set of emission patterns 11 of the light emission network 10 which has the aperiodic distribution chosen to break up spatial interference due to the stacking. The transmission patterns 33 of the transmission network 3 have, for their part, a periodic distribution.

[0075] By periodic distribution, it is meant here that the patterns of the network are arranged with regular spacings between them. By aperiodic distribution, it is meant here that the patterns of the network are arranged with spacings which vary according to the pairs of patterns considered. In other words, two neighboring patterns two by two are arranged with spacings which vary. By aperiodic, it is meant here an at least partial absence of periodicity of the network.

[0076] In the example of [Fig.4], the emission patterns 11 of the light emission network 10 are distributed in two dimensions, and the light emission network 10 comprises a fictitious reference point Af associated with each pattern 11, and each pattern 11 is spaced from the reference point Af associated with it by a random distance and / or angle following a statistical distribution curve, for example a Gaussian curve.

[0077] When the network 10 comprises a set of patterns 11 distributed along a dimension (as illustrated in [Fig.5]), the network 10 comprises a fictitious reference point Af associated with each pattern 11, and each pattern 11 is spaced from the reference point Af by a random distance following a statistical distribution curve. In other words, each pattern is arranged according to a spatial offset relative to the reference point Af associated with it. The statistical distribution curve may be a Gaussian curve or may have a random component, regardless of its statistical distribution law (or probability law).

[0078] In the example of [Fig.l], the light structure 1 forms the light emission network 10. Here, the light structure 1 is a light guide with light extraction microstructures 12 which form the light emission network 10. In this case, the light emission network 10 is in particular distinct from primary light sources. Each light extraction microstructure 12 corresponds to a pattern 11.

[0079] The invention thus makes it possible to provide a lighting device 100 in which the pattern networks avoid the Moiré effect, by adding a random component in the network 10.

[0080] In the example of [Fig.l], the lighting device 100 comprises a decoration 30, in the form of a decorative layer.

[0081] A transparent support 2 is interposed, in the stack, between the luminous structure 1 and the decorative layer 30.

[0082] The lighting device 100 comprises a transmission mask 31 arranged to form the light transmission network 3.

[0083] In the example described in [Fig.l], the transmission mask 31 is formed by the decoration 30. In other words, the transmission patterns 33 are arranged on the decoration 30 through which the light emitted by the emission grating 10 is emitted. In other words, the decoration 30 comprises the light transmission patterns 33 (for example defined by perforations in the decoration layer 30) arranged to allow the transmission of the light emitted by the light emission grating 10, and zones (here solid zones between the perforations) arranged to absorb the light emitted by the light emission grating 10.

[0084] In another example illustrated in [Fig.2], the lighting device 100 comprises an emission mask 14 arranged to form, with the light structure 1, the light emission network 10, said emission mask 14 being attached to the light structure 1.

[0085] The mask 14 is made of a material which at least partially blocks the light coming from the light structure 1 and comprises openings (or perforations) to let this light pass according to the emission patterns 11 provided by these openings (or perforations).

[0086] The lighting device 100 comprises a heating structure 4 arranged to produce heat. The heating structure 4 will be further described below.

[0087] In the example illustrated in [Fig.2], the mask 14 is formed by the heating structure 4. The emission patterns 11 are arranged on the heating structure 4 through which the light from the light structure 1 attached to the heating structure 4 is emitted. In other words, the heating structure 4 comprises the light emission patterns 11 (defined by perforations in the heating structure 4) arranged for the emission of the light emitted by the light structure 1, and zones arranged to absorb the light emitted by the light structure 1. The function of emission mask 14 is played by the heating structure 4.

[0088] In the example illustrated in [Fig.2], the transmission mask 31 is formed by the decoration 30 (as for the example of [Fig.l]).

[0089] In a variant not illustrated, the emission mask is arranged between the luminous structure 1 and the heating structure 4. In other words, the emission mask function is performed by a structure having no other functions.

[0090] In another example illustrated in [Fig.3], the transmission mask 31 is formed by the heating structure 4. In other words, the transmission patterns 33 are arranged on the heating structure 4 through which the light emitted by the emission network 10 is transmitted. In other words, the heating structure 4 comprises the light transmission patterns 33 arranged to allow the transmission of the light emitted by the light emission network 10, and zones arranged to absorb the light emitted by the light emission network 10.

[0091] In the example illustrated in [Fig.3], the light structure 1 forms the light emission network 10. As for the example of [Fig.l], the light structure 1 is a light guide with light extraction microstructures 12 which form the light emission network 10.

[0092] In a variant not illustrated, the transmission mask is arranged between the heating structure 4 and the decoration 30.

[0093]

[0094] The transmission patterns 33 have a shape chosen from a polygon, a circle, a disc, an oval, an ellipse, a line. In the example of [Fig.6], these are transmission patterns 33 of circular shape.

[0095] The emission patterns 11 have a shape chosen from a polygon, a circle, a disc, an oval, an ellipse, a line. In the example of [Fig.4], these are emission patterns 11 having a circular shape.

[0096] The transmission patterns 33 and the emission patterns 11 have the same shape, or different shapes.

[0097] In the examples described, the lighting device 100 comprises a functional face 200 towards which the light emitted by the light structure 1 can be sent, this functional face 200 being configured to diffuse the light thus received towards the outside of the lighting device 100, for example towards an area of ​​a vehicle interior.

[0098] The functional face 200 is thus a face of the lighting device 100 on which the lighting function is manifested, for example to illuminate an area of ​​this passenger compartment or to create a light effect visible from the passenger compartment.

[0099] In the examples of figures 2 and 3 in which the lighting device 100 comprises a heating structure 4, the entire heating structure 4 is placed between the functional face 200 and the luminous structure 1 so that light from this luminous structure 1 passes through the heating structure 4 before reaching the functional face 200.

[0100] As illustrated in [Fig.7], the heating structure 4 comprises a resistive layer 51 arranged to produce heat when this layer is traversed by an electric current. This resistive layer 51 defines a masking zone produced in a material configured to absorb the light emitted by the luminous structure 1 and prevent its passage, for example a material comprising carbon.

[0101] The heating structure 4 comprises, on a substrate 58 (for example made of non-woven fabric), two electrodes 52, which are in electrical contact with the resistive layer 51 so as to allow an electric current to flow through the resistive layer 51 between these two electrodes 52. The resistive layer is for example deposited on the substrate by printing, screen printing, lamination of several materials or by physical vapor deposition (well known as PVD for “Physical Vapor Deposition” in English).

[0102] These electrodes 52 have parallel sections 53 between which the resistive layer 51 is located, and transverse sections 54 which are connected to electrical supply wires 55.

[0103] The heating structure 50 comprises clear zones 59 formed for example by perforations of the heating structure 50 and deposition in these perforations by an electrically conductive material and configured to allow light to pass through. The clear zones 59 are configured to allow the passage of electric current within said clear zones 59.

[0104] The light areas 59 are transparent or translucent and configured to allow light from the light structure 1 to pass through and form light emission patterns 11 or light transmission patterns 33, as the case may be.

[0105] The lighting device 100 has a panel shape, and is flexible, namely it can be shaped to take a predetermined shape.

[0106] The decoration 30 is visible from inside the passenger compartment, this decoration 30 being for example a covering of the passenger compartment, such as for example a fabric, a leather or an aesthetic covering.

[0107] The lighting device 100 according to the invention thus makes it possible to perform, in addition to the heating and lighting functions, a decorative function, for example with a predetermined leather or fabric zone, visible from the passenger compartment.

[0108] [Fig. 8] shows an example of a light structure 1 comprising a flexible guide sheet 110, said sheet comprising a film 111 at its core. This film 111 is capable of receiving light rays via a light injection edge 114 and of returning the light rays in the direction along the axis Ox substantially perpendicular to the surface of the flexible guide sheet 111 via a light emission face emitting the light.

[0109] A flexible guide sheet is understood to mean an optical guide element one of whose dimensions 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 to its dimensions according to the Oxy plane in which the flexible guide sheet 110 extends.

[0110] The film 111 comprises a set of optical decoupling elements 113 formed by microstructures on one of the faces of the film 111 extending along the axis Oy. The microstructures 113 are capable of returning the light rays guided in the flexible film 111 outside the flexible guide sheet 110, in particular in a direction along the axis Ox perpendicular to the surface of the sheet 110.

[0111] The microstructures 113 define emission patterns

[0112] The film is made of polycarbonate (PC), or polymethyl methacrylate (PMMA), or thermoplastic polyurethane (TUP), or polyethylene terephthalate (PET).

[0113] The flexible film 111 may have a thickness, namely the dimension along the Ox axis, of between 10 and 1000 micrometers. More precisely, the thickness of the flexible film 111 may be between 50 and 1000 micrometers, for example between 100 and 500 micrometers, preferably 150 micrometers. Alternatively, it is the flexible guide sheet 110 which has a thickness of between 10 and 1000 micrometers. More precisely, the thickness of the flexible film 111 may be between 50 and 1000 micrometers, for example between 100 and 500 micrometers, preferably 150 micrometers.

[0114] The aforementioned materials, combined with a low thickness as described above, make it possible to obtain a flexible and transparent film 111. Other materials may be provided for the composition of the flexible film 111. However, it is preferable according to the invention to provide deformable and transparent materials.

[0115] The flexible guide sheet 110 further comprises one or two protective layers 112.1 and 112.2, which make it possible to mechanically protect the flexible film 111.

[0116] The guide sheet 110 being flexible, it is not necessarily included in a plane but can be curved or shaped, depending on the position in which it is placed and the mechanical constraints applied to it.

[0117] The propagation of the light rays in the flexible film 111 is done by total internal reflection thanks to the difference between the refractive index of the flexible film 111 and that of at least one adjacent layer, here of an adhesive layer applied to at least one face of the flexible film.

[0118] In the illustrated example, the assembly of the flexible film 111 with the protective layers 112.1, 112.2 is done by gluing. Specifically, an adhesive layer 115.1, 115.2, here a layer of glue, is located between the flexible film 111 and each protective layer 112.1, 112.2, and this on both sides of the flexible film 111 to adhere the protective layers 112.1, 112.2 to the flexible film 111.

[0119] The chosen glue is transparent and has a refractive index different from that of the flexible film so as to allow total internal reflection in the flexible film. 111. In other words, due to the difference in refractive index, the light rays propagating in the flexible film undergo total reflection when they encounter the interface between the flexible film and the adhesive layer with an angle of incidence lower than the normal incidence. Thus, the guide sheet 110 is capable of guiding light by total internal reflection of this light, for example from an entry zone, here the edge 114, to an exit zone.

[0120] A coating of optical decoupling elements 113 formed by microstructures may be attached to one of the faces of the flexible film 111, in particular the light emission face, or may be integrated into the flexible film 111. The coating of microstructures 113 may in particular have a thickness along the Ox axis of less than 20 micrometers. These optical decoupling elements are configured 113 to reflect the light in a directional manner, in particular at an angle substantially perpendicular to the emission face of the flexible guide sheet 110.

[0121] Microstructures 113 are structures, or irregularities of the flexible film, whose dimensions are less than a few micrometers. The microstructures thus also cover nanometric structures.

[0122] A light source 120 (for example an LED or light-emitting diode in French) linked to a light injection element makes it possible to inject light into the flexible guide sheet 110.

[0123] In another exemplary embodiment of the invention, the light sources may be part of a light engine.

[0124] According to one aspect of the invention, the light engine is an electronic device, in particular a printed circuit device, comprising one or more LEDs (light-emitting diodes) and at least one light guide for guiding the light emitted by the LED(s).

[0125] According to one aspect of the invention, the light guide of the light engine comprises a plate in which light can propagate, this plate comprising at least one light emission face.

Claims

Claims

1. Lighting device (100) comprising, in a stack: - a light structure (1) arranged to emit light, - a light emission network (10) comprising a set of emission patterns (11) through which the light from the light structure (1) is emitted, - a light transmission network (3) comprising a set of transmission patterns (33) through which the light emitted by the emission network (10) passes, - wherein the emission network (10) and the transmission network (3) have spatial distributions chosen to break up spatial interference due to the stacking of the emission and transmission networks.

2. Lighting device (100) according to the preceding claim, wherein at least one of the transmission network (3) or the emission network (10) comprises emission patterns (11) or transmission patterns following a periodic distribution, and the other of the transmission network (3) or the emission network (10) comprises emission patterns or transmission patterns following an aperiodic distribution chosen to break spatial interferences due to the stacking (or superposition) of the emission and transmission networks.

3. Lighting device (100) according to one of the preceding claims, wherein the light structure (1) forms the light emission network (10), and in particular the light structure (1) comprises a light guide with light extraction microstructures which form the light emission network (10).

4. Lighting device (100) according to one of the preceding claims, in which the lighting device (100) comprises an emission mask arranged to form, with the light structure (1), the light emission network (10), said emission mask being in particular attached to the light structure (1).

5. Lighting device (100) according to the preceding claim, wherein the emission mask is formed by the heating structure (4).

6. A lighting device (100) according to one of the preceding claims, wherein the lighting device (100) comprises a decoration (30) and a transmission mask is formed by the decoration.

7. Lighting device (100) according to one of the preceding claims, wherein the transmission patterns (33) have a shape chosen from a polygon, a circle, a disc, an oval, an ellipse, a line, and the emission patterns (11) have a shape chosen from a polygon, a circle, a disc, an oval, an ellipse, a line.

8. A lighting device (100) according to any preceding claim, wherein the lighting device (100) has a panel shape

9. A lighting device (100) according to any preceding claim, wherein the lighting device (100) is flexible, i.e. it can be shaped to take a predetermined shape

10. Vehicle comprising a passenger compartment, said passenger compartment comprising said at least one lighting device (100) according to one of the preceding claims.

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