Light emitting device having light emitting module arranged in front of lighting module

Abstract

The invention relates to a lighting device (300) for a motor vehicle, comprising at least one lighting module (301.1; 301.2), a light emitting module (100; 200), and a control element (340). The light emitting module is at least partially transparent and arranged such that light emitted by the lighting module passes through the light emitting module, and the control element is capable of enabling the light emitting module when said at least one lighting module is deactivated.

Description

[0001] The invention relates to the field of lighting devices comprising one or more lighting modules, in particular lighting devices for motor vehicle headlamps. The invention is particularly, but not exclusively, applicable to the appearance of such headlamps, in particular when the vehicle is driven during the day.

[0002] Lighting devices, such as headlights, usually have a plurality of lighting functions which are performed by one or more modules. The following lighting functions are particularly known:

[0003] - Low beam (LB) lighting function;

[0004] - a high beam (HB) lighting function which may be performed by the same lighting module as that responsible for the LB function or by a different module;

[0005] - Daytime signalling functions, also called daytime running lights (DRL), usually performed by a light module different from the LB / HB module;

[0006] - Position light (PL) signalling function which can be performed by a lighting module performing a DRL function or by another lighting module.

[0007] The appearance of a luminaire which depends on the respective arrangement of the luminaire modules, their number and their respective shape is referred to as a “signature.” The signature is particularly visible when all modules of the luminaire are activated.

[0008] This signature can be perceived differently when driving at night than when driving during the day. This is because at night the modules performing the lighting functions (such as LB and HB) are visible to an outside observer. A complete signature is thus obtained.

[0009] However, during the day, these lighting functions are usually not enabled, which results in one or more dark areas in the signature of the light emitting device. The signature of the light emitting device is incomplete and different from the night signature for an observer located outside the vehicle.

[0010] There is therefore a need for a signature of a lighting device for a motor vehicle that is consistent between daytime and nighttime driving, while providing a solution that is robust, easily incorporated and low cost.

[0011] The present invention improves this situation.

[0012] To this end, a first aspect of the invention relates to a lighting device for a motor vehicle, the lighting device comprising at least one lighting module capable of projecting light to perform a lighting function, a lighting module, and a control element. The lighting module is at least partially transparent and is arranged so that the light emitted by the lighting module passes through the lighting module, and the control element is capable of enabling the lighting module when at least one lighting module is deactivated.

[0013] The use of a lighting module that is enabled when at least one lighting module is disabled makes it possible to make the signature of the lighting device consistent between night driving and day driving. In addition, since the lighting module is at least partially transparent, the lighting module can perform a lighting function when the lighting module is not enabled.

[0014] According to a non-limiting embodiment, the at least one lighting module is capable of performing a low-beam lighting function and / or a high-beam lighting function.

[0015] Such functions are usually deactivated during the day and the modules performing these functions are just able to create dark areas in the signature of the lighting device.

[0016] When a single lighting module is able to perform both functions, the footprint associated with the performance of these functions is limited within the lighting fixture.

[0017] According to a non-limiting embodiment, the lighting device may include a first lighting module capable of performing a low beam lighting function and a second lighting module capable of performing a high beam lighting function, the lighting modules being arranged so that light from the first lighting module and / or the second lighting module passes through the lighting module.

[0018] Thus, the light emitting device may comprise two lighting modules, and the light emitting module may be capable of shielding a dark area associated with at least one of the two lighting modules.

[0019] A single lighting module can also be shared by two lighting modules, which limits the cost and the occupied space of the lighting device according to the present invention.

[0020] According to a non-limiting embodiment, the light emitting modules are capable of emitting light in at least one light emitting pattern, the light emitting modules being arranged such that the at least one light emitting pattern faces an optical surface of at least one lighting module.

[0021] Thus, the luminous pattern may overlap with the optical surface of the at least one lighting module.The luminous pattern may in particular be the same shape as the optical surface of the at least one lighting module, which makes it possible to conform the signature of the luminous device with a high degree of precision.

[0022] According to a non-limiting embodiment, the light emitting module may be arranged inside a lens of the optical system of the lighting module.

[0023] Therefore, the light emitting module is mechanically protected and is not exposed to the outside of the light emitting device.

[0024] According to a non-limiting embodiment, the light emitting module may be arranged on an outer lens of the light emitting device.

[0025] This facilitates the assembly of the lighting module.

[0026] According to a first non-limiting embodiment, the lighting module may include:

[0027] - a light guide comprising an at least partially transparent guide plate, the guide plate being capable of receiving light through at least one light injection edge of said guide plate and reflecting the light in at least one emission pattern in a direction locally substantially perpendicular to a surface of the guide plate, the light guide further comprising at least one light injection element being capable of receiving light and distributing it in the guide plate;

[0028] - at least one light source capable of injecting light into said at least one light injection element.

[0029] The control element is capable of activating the at least one light source when the lighting module is deactivated.

[0030] Therefore, the light emitting module is of the type with a guide plate (eg, a flexible guide plate) which is low-cost, easy to manufacture, and easy to combine. In addition, this solution is less affected by environmental conditions such as humidity and temperature.

[0031] By "flexible" is meant that the guide plate can be bent without being damaged. Thus, such a guide plate can be placed on a non-flat substrate and adopt its shape without being damaged. In particular, when a light module comprising a flexible guide plate is placed facing the lighting module, the flexible guide plate can be bent according to the curvature of the optical projection surface of the lighting module. In particular, the flexible guide plate can be arranged such that it is convex, wherein the radius of curvature faces the interior of the motor vehicle when the light emitting device is mounted in or on said motor vehicle.

[0032] In addition, according to a first non-limiting embodiment, the light-emitting device may include a first lighting module capable of performing a low beam lighting function and a second lighting module capable of performing a high beam lighting function, and the light-emitting modules may include a single light guide, a first pattern is etched into a first portion of a guide plate of the single light guide, and a second pattern is etched into a second portion of the guide plate of the single light guide, the first pattern is arranged to face a first optical projection surface of the first lighting module, and the second pattern is arranged to face a second optical projection surface of the second lighting module.

[0033] Thus, by means of a single injection element and one source for illuminating two patterns facing two different lighting modules, the occupied space and the costs associated with the lighting modules are reduced.

[0034] In addition, a single light guide may include a guide plate, a first light injection element and a second light injection element, and the first light injection element may be arranged to inject light into a first segment of a light injection edge of the guide plate, and the second light injection element may be arranged to inject light into a second segment of the light injection edge of the guide plate, the first portion of the guide plate is positioned to face the first segment of the light injection edge, and the second portion of the guide plate is positioned to face the second segment of the light injection edge.

[0035] Such an embodiment advantageously enables selective control of the illumination of the first and second light emitting areas. Thus, only one or the other of the patterns may be illuminated, in particular when only one of the lighting modules is deactivated.

[0036] According to the second non-limiting embodiment and the third non-limiting embodiment, the light-emitting module may include an at least partially transparent substrate, an emission layer, the emission layer including an electroluminescent material contained between a first electrode and a second electrode, the first electrode being contained between the transparent substrate and the emission layer, and a control element capable of controlling a voltage source capable of applying a voltage between the first electrode and the second electrode, so that the emission layer emits light toward the outside of the light-emitting module.

[0037] The lighting module may thus be an at least partially transparent display which is only enabled when the lighting module is deactivated. Thus, the occupied space associated with the lighting device is reduced compared to a solution with a light guide.

[0038] In addition, according to the second non-limiting embodiment and the third non-limiting embodiment, the first electrode, the second electrode, and the emission layer may each have a thickness of less than 10 micrometers, in particular, less than one micrometer.

[0039] Such a thickness allows a high degree of transparency of the light emitting module, which enables the lighting module to perform a lighting function while reducing the occupied space associated with the light emitting device.Such a thickness can be obtained in particular using atomic layer deposition methods.

[0040] According to a non-limiting embodiment, the light emitting module may further include a first transmission layer and a second transmission layer, the first transmission layer being included between the emission layer and the first electrode, and the second transmission layer being included between the emission layer and the second electrode.

[0041] Therefore, recombination of electrons and holes in the emission layer may be promoted to emit light to the outside of the light emitting module.

[0042] In the second non-limiting embodiment and the third non-limiting embodiment, the light emitting module may further include an at least partially transparent protective layer, for example made of glass, the second electrode being included between the protective layer and the emitting layer.

[0043] The lighting module is thus mechanically protected.

[0044] According to a second non-limiting embodiment, the electroluminescent material may be an inorganic electroluminescent material, in particular an inorganic electroluminescent material comprising zinc sulfide doped with manganese.

[0045] This material has better resistance to temperature changes than organic materials.

[0046] Zinc sulfide doped with manganese makes it possible to obtain yellow or green light and to operate in the temperature range between -100°C and +105°C.

[0047] According to a third non-limiting embodiment, the electroluminescent material may be an organic electroluminescent material, in particular an organic electroluminescent polymer.

[0048] The light emitting module may thus be an organic light emitting diode (OLED) or a pixelated OLED display.

[0049] According to a non-limiting embodiment, the lighting device may further comprise a signaling module capable of performing a daytime running light function, wherein the control unit is capable of controlling the signaling module and when the daytime running light function is activated, the control unit may be configured to activate the lighting module.

[0050] Since this signaling function is enabled during the day, the lighting module is enabled when the lighting function is deactivated. This makes it easier to make the identification of the lighting device consistent.

[0051] Other features and advantages of the present invention will become apparent by reviewing the following detailed description and the accompanying drawings, in which:

[0052] [ Figure 1a ] depicts a light guide for a lighting module of a lighting device for a motor vehicle according to a first non-limiting embodiment of the invention;

[0053] [ Figure 1b ] depicts a front view of a lighting module of a lighting device for a motor vehicle according to a first non-limiting embodiment of the present invention;

[0054] [ Figure 1c ] depicts a three-dimensional view of a lighting module of a lighting device for a motor vehicle according to a first non-limiting embodiment of the present invention;

[0055] [ Figure 2] depicts a lighting module for a lighting device for a motor vehicle according to a second non-limiting embodiment and a third non-limiting embodiment of the present invention;

[0056] [ Figure 3 ] depicts a lighting device for a motor vehicle according to a non-limiting embodiment of the present invention;

[0057] [ Figure 4 ] depicts a first example of a lighting module for a lighting device for a motor vehicle according to a first non-limiting embodiment of the present invention;

[0058] [ Figure 5 ] depicts a second example of a lighting module for a lighting device for a motor vehicle according to the first non-limiting embodiment of the present invention;

[0059] [ Figure 6 ] depicts a third example of a lighting module for a lighting device for a motor vehicle according to the first non-limiting embodiment of the present invention.

[0060] The present description focuses on features that distinguish the light emitting device and the light emitting module from those known in the prior art.

[0061] Figure 1a A light guide 105 of a lighting module for a lighting device of a motor vehicle is shown according to a first non-limiting embodiment of the invention.

[0062] The light guide 105 comprises a guide plate 110 capable of receiving light rays passing through a light injection edge 114 and reflecting the light rays in a direction Z substantially perpendicular to a surface of the guide plate, the guide plate thus being arranged in a substantially perpendicular direction. Figure 1a The XY plane in FIG.

[0063] A guide plate is referred to as an optical guide element, one of the dimensions of which is much smaller than the other two dimensions in space, for example, one or more orders of magnitude smaller. Figure 1a As shown, in this case, the guide plate is a guide plate whose thickness along the axis Z is at least two orders of magnitude smaller than its dimension in the plane XY in which the guide plate 110 extends. Such a guide plate may advantageously be flexible, which makes it easier to incorporate into a light emitting device. By way of illustration, the following description relates to a flexible guide plate 110.

[0064] The guide plate 110 may comprise at its core a membrane 111 which may advantageously be flexible, comprising at least one light injection edge 114 capable of guiding light in a general direction X, and comprising a set of microstructures 113 capable of reflecting the light guided in the membrane 111 to the outside of the guide plate 110, in particular in one or more directions substantially along the axis Z.

[0065] The film 111 may be a polycarbonate (PC), polymethyl methacrylate (PMMA), thermoplastic polyurethane (TPU), or polyethylene terephthalate (PET) substrate film. The film 111 may have a thickness, i.e. a dimension along the axis Z, between 12 and 1000 microns. More specifically, the film 111 may have a thickness between 50 and 1000 microns, for example between 200 and 500 microns. As a variant, it is a guide plate 110 having a thickness between 200 and 1000 microns.

[0066] The above materials associated with the small thickness as described above make it possible to obtain a flexible membrane 111. Other materials can be envisaged for the composition of the flexible membrane 111. However, it is preferred according to the invention to envisage a deformable transparent material.

[0067] A thin coating of microstructures 113 may be applied to one of the faces of the film 111, or integrated into the film 111. The microstructure coating 113 may in particular have a thickness along the axis Z of less than 20 micrometers.

[0068] Such microstructures 113 may take the general form of bosses on which light is reflected in a direction substantially along the axis Z. Such microstructures 113 may be adapted so that the light leaving the film 111 forms a luminescent pattern. To this end, the microstructures 113 may be etched by UV printing so that the light injected into the injection edge 114 is reflected in a desired pattern through the surface of the film 111. For example, the microstructures may be distributed to form a luminescent pattern of a given shape, with uniform light over the entire luminescent pattern thus formed.

[0069] The microstructure 113 given refers to a structure or irregularity of the film 111 whose size is less than a few micrometers. Therefore, the microstructure also includes a nanostructure. Microstructures 113 of this size make it possible to ensure a high transparency of the film 111. In particular, a transparency of about 97% can be obtained in practice by using the microstructure 113. The light-emitting module according to the first embodiment of the present invention, including the light guide 105, is at least partially transparent, that is, it allows at least some of the light rays reaching the guide plate to pass through. For example, the light-emitting module can have a transparency greater than 50%, preferably greater than 70%, or even greater than 90%.

[0070] Advantageously, the microstructures 113 may be distributed along the axis X such that the linear density of the microstructures 113 is proportional to the distance from the light injection edge 114 through which the light injected by the injection element 120 of the light guide 105 is received.

[0071] In other words, the further the microstructures 113 are from the light injection edge 114 , the more densely they are grouped together. This distribution advantageously makes it possible to ensure a uniform distribution along the axis X of the luminous intensity of the pattern emitted by the guide plate 110 .

[0072] The guide plate 110 may further comprise one or two optional protective layers 112.1 and 112.2 making it possible to mechanically protect the film 111. Furthermore, at least one of the protective layers 112.1 and 112.2 may comprise an anti-UV treatment making it possible to protect the film 111 from UV rays once the microstructures 113 have been etched. Without such UV protection, the pattern projected by the guide plate 110 may deteriorate over time, in particular when exposed to sunlight.

[0073] The film 111 and the protective layers 112.1 and 112.2 are Figure 1a However, it will be understood that the protective layers 112.1 and 112.2 may be attached to the membrane 111, in particular by lamination.

[0074] Since the guide plate 110 may be flexible, it is not necessarily contained in a plane, but may be bent, depending on where it is placed and the mechanical constraints imposed on it.

[0075] Figure 1a The light guide 105 shown in FIG. 1 also includes a light injection element 120, which includes a reference Figure 1b and Figure 1c The described assembly of the injection plate, the light injection element 120 is able to distribute light in the guide plate 110 at different positions along the light injection edge 114 on the axis Y. At each position along the axis Y, the light is injected in a direction substantially parallel to the axis X.

[0076] The light injection element 120 includes an input surface 121. Figure 1a However, the light injection element 120 may have an input surface with a different cross-sectional shape.

[0077] exist Figure 1a , the light injection element 120 is shown as having an output surface 122 extending in the direction Y and positioned facing the light injection edge 114. Figure 1b and Figure 1c It will be understood from the description that the output surface 122 and the light injection edge 114 preferably coincide, the assembly of the injection plate and the film 111 forming a single part.

[0078] The input surface 121 is capable of receiving light from outside the light guide 105 and Figure 1aThe light injection element 120 is capable of guiding the light longitudinally along the axis Y, thereby distributing the light on the output surface 122. Figure 1b and Figure 1c The distribution of light by the output surface 122 will be more clearly understood in the description of FIG.

[0079] Figure 1b A lighting module 100 of a lighting device according to a first embodiment of the invention is shown. The lighting module 100 comprises a light source 130 and a light guide 105 having an injection element 120 and a guide plate 110.

[0080] refer to Figure 1c , the injection element 120 may include a plurality of injection plates 123.1, 123.2 and 123.3 capable of receiving light from the source 130 through the input surface 121 and directing the light to components 124.1, 124.2 and 124.3 at different positions along the Y axis. Figure 1b and Figure 1c As shown, the injection plates 123.1, 123.2 and 123.3 can be made of the same material and have the same thickness as the film 111 of the guide plate 110. Therefore, the light guide 105 can be obtained using a roll-to-roll (R2R) manufacturing method, during which the film 111 and the injection plates 123.1, 123.2 and 123.3 are obtained from the same roll of film, which can be flexible, and the injection plates 123.1, 123.2 and 123.3 are cut at different positions along the axis Y in a cutting direction substantially parallel to the direction X. The injection plates 123.1, 123.2 and 123.3 thus obtained are preferably flexible and can be as Figure 1c Each injection plate 123.1, 123.2 and 123.3 can be cut along the corresponding length so that once it is folded, its end forms the injection surface 121 with the end of other injection plates, as shown. Figure 1c Depicted.

[0081] Figure 1b and Figure 1c An injection element 120 having three injection plates 123.1, 123.2 and 123.3 is shown in FIG. 1 merely by way of illustration. However, the injection element 120 may comprise any assembly of injection plates, the assembly comprising at least two injection plates.

[0082] There is no restriction on the light source 130. The light source 130 can generate light in a range of wavelengths. This range can be centered on visible colors so as to generate colored light, such as blue, red or green. As a variant, the light source 130 can emit light across the entire wavelength range visible to the human eye in such a way that white light is generated. Laser-type light sources 130 can generate a very narrow wavelength range.

[0083] The light source 130 can be controlled by a control element. Figure 1b and Figure 1c Not shown, but referred to below Figures 3 to 6 Give a description.

[0084] As a variant, the light source 130 is not arranged directly facing the input surface 121 of the injection element 120 , but the lighting module 100 according to the first embodiment further comprises an optical fiber placed between the source 130 and the injection element 120 , which makes it possible to move the source 130 away from the light guide 105 .

[0085] Thus, the disclosed injection element 120 allows injecting light at different longitudinal positions on the light injection edge 114 along the axis Y. Each longitudinal position on the injection edge 114 may correspond to a guide line of the film 111 capable of guiding light on the axis X along such guide line.

[0086] Thus, this association of the light guide 105 comprising the guide plate 110 and the injection element 120 with the source 130 makes it possible to display a pattern by emitting light through an at least partially transparent surface with good surface consistency, mainly along the direction Z. Furthermore, when the guide plate 110 is flexible, it is easier to incorporate the light emitting module 100 into a device.

[0087] In practice, such a lighting module 100 according to the first embodiment makes it possible to emit light with a brightness between 100 and 1000 candela per square meter, wherein the light extraction efficiency may range between 25% and 80%.

[0088] Details regarding the structure and arrangement of elements 105 , 110 , 120 , and 130 are further described in international patent application published under number WO 2011130715 A2.

[0089] By "pattern" is meant any predefined spatial distribution of the luminous intensity emitted by the luminous module 100. In particular, reference is made here to a two-dimensional pattern or a one-dimensional pattern.

[0090] Thus, the pattern may include a uniform distribution of light across the entire light emitting module. The pattern may also include a two-dimensional shape or symbol obtained by contrast between luminous intensities at different locations in the plane XY of the guide plate 110. The pattern may also include multiple shapes or symbols.

[0091] A light emitting module for a light emitting device for a vehicle according to a first embodiment of the present invention includes:

[0092] - a light guide 105 comprising a guide plate capable of reflecting light in at least one luminous pattern (e.g. Figure 1aThe guide plate 110 depicted in FIG. 1 and at least one light injection element (such as reference Figure 1a , Figure 1b and Figure 1c injection element 120 described above); and

[0093] - at least one light source (such as the one referenced above Figure 1b and Figure 1c The at least one light source 130 described above is capable of injecting light into the at least one injection element.

[0094] Figure 2 A lighting module 200 for a lighting device for a vehicle according to a second non-limiting embodiment and a third non-limiting embodiment of the present invention is depicted.

[0095] Unlike the light emitting module 100 having a light guide, the light emitting module 200 is a display enabled by applying a potential difference to an emission layer made of an electroluminescent material.

[0096] The light emitting module 200 is also at least partially transparent, in particular due to the properties of the layers forming the light emitting module, as will be described below.

[0097] The second and third embodiments differ primarily with respect to the electroluminescent emission layer used.

[0098] According to the second embodiment, an electroluminescent inorganic phosphor is used to form the emission layer, while in the third embodiment, an electroluminescent organic material is used to form the emission layer.

[0099] In the second embodiment and the third embodiment, the light emitting module 200 includes:

[0100] - a substrate 201 made of an at least partially transparent material, for example glass. This material may be chosen because it allows a high degree of transparency;

[0101] a first electrode 203 , for example a cathode, connected to a voltage source controlled by a control element 240 ;

[0102] - a hole transport layer (HTL) 204 in contact with the cathode 203;

[0103] - an emitting layer 205 comprising an electroluminescent material;

[0104] - an electron transport layer (ETL) 206 in contact with the second electrode 207;

[0105] a second electrode 207, in particular an anode 207. It should be noted that anode and cathode may be reversed in the stack of layers, connected to a voltage source controlled by a control element 240;

[0106] - A protective layer 209 made of an at least partially transparent material, preferably glass. This material may be chosen because it allows a high degree of transparency.

[0107] The electron transport layer 206 may include a material doped with electrons (i.e., having extra electrons), thereby facilitating the transfer of electrons in the emission layer 205. In a symmetrical manner, the hole transport layer 206 may include a material lacking electrons or doped with holes, thereby facilitating the generation of holes in the emission layer and, therefore, facilitating recombination in the emission layer 205, resulting in the emission of photons. Holes and electrons combine in the emission layer, resulting in the emission of photons, the characteristics of which depend in particular on the electroluminescent material of the emission layer. This principle is well known and will not be described in more detail in this specification.

[0108] Therefore, when a voltage greater than a voltage threshold is applied to electrodes 203 and 207, emission layer 205 may emit photons.

[0109] The light emitting module 200 according to the second embodiment and the third embodiment may further optionally include:

[0110] - a layer forming an ion barrier 202 between the substrate 201 and the first electrode 203;

[0111] a layer of optical index matching material 208 comprised between the protective layer 209 and the second electrode 207, capable of allowing light from the emitting layer 205 to pass through the protective layer 209. In particular, the light emitted by the emitting layer 205 can be bent towards a main emission direction, which is preferably along the axis Z and is therefore perpendicular to the surface of the protective layer 209.

[0112] The properties and thickness of the optical index matching material 208 may depend on the optical index of the protective layer 209 .

[0113] exist Figure 2 In the embodiment, the first electrode 203 includes a plurality of conductive elements arranged at different positions along the axis X and extending longitudinally along the axis Y. Similarly, the second electrode 207 may include a plurality of conductive elements arranged at different positions along the axis Y and extending longitudinally along the axis X. Therefore, the control element 240 may apply a voltage to a specific position on the emissive layer by selecting an element of the first electrode to select a position on the axis X and by selecting an element of the second electrode 207 to select a position on the axis Y. Therefore, the light-emitting module 200 may be controlled in a pixelated manner. The light-emitting module 200 may therefore form a pixelated display. However, such an embodiment is optional.

[0114] According to the present invention, the first electrode 203 and the second electrode 207 may each include a single planar element extending continuously at different positions on the axis X and the axis Y, so as to apply a voltage to a set of positions on the axis X and the axis Y on the emission layer, and these positions form a luminous pattern. This luminous pattern may have a regular shape (such as a square, rectangle, diamond or other shape), or may have a more complex shape, which includes, for example, a curve. In order to produce such a pattern, the emission layer 205 may have a given shape corresponding to the desired luminous pattern in the plane XY. Therefore, at certain positions on the light-emitting module, the emission layer 205 may not be present between the layer 204 and the layer 206, and therefore applying a voltage to these positions will not generate any light, so that a luminous pattern can be generated.

[0115] At least partial transparency of the light module 200 is made possible by:

[0116] - the material used for the cover layer 209 and the base layer 201, preferably made of glass. Therefore, the layers 201 to 209 are not limited in their thickness along the axis Z. However, the thickness of each layer 201 and 209 is preferably less than 2 mm;

[0117] - A respective thickness of the electrodes 203 and 207 and of the layers 202 , 204 to 206 and 208 of less than 10 micrometers, preferably less than one micrometer.

[0118] The elements common to the second embodiment and the third embodiment are described above.

[0119] In a second embodiment, the emission layer 205 includes an inorganic electroluminescent material, such as an inorganic phosphor. For example, the emission layer 205 may include zinc sulfide (denoted as ZnS) doped with manganese (denoted as ZnS:Mn). The ZnS:Mn material makes it possible to emit photons with a wavelength corresponding to yellow or green. According to the second embodiment, other inorganic electroluminescent materials can be envisioned. For example, the emission layer 205 may include indium gallium nitride InGaN, which includes gallium nitride GaN and indium nitride InN. The wavelength of light emitted by such a material can vary from the ultraviolet domain to orange according to the ratio of indium to gallium. According to other examples, the emission layer 205 may include quantum dots based on cadmium selenide (CdSe), copper indium (CuIn), indium phosphide (InP) and / or lead selenide (PbSe). The color of the emitted light can vary according to the size of the quantum dots, particularly in all wavelengths in the visible domain. By way of illustration, six nanometer quantum dots are capable of emitting red light, while two nanometer quantum dots are capable of emitting blue light.

[0120] The electrodes 203 and 207 may be made of indium tin oxide (ITO). However, the material of the electrodes 203 and 207 is not limited.

[0121] Likewise, there is no limitation on the material of the transmission layers 204 and 206, and these transmission layers may be made of antimony-doped tin oxide (also denoted as ATO).

[0122] Preferably, some of these layers can be produced using a manufacturing method known as atomic layer deposition (ALD), which makes it possible to increase the transparency of the light-emitting module 200. In particular, this manufacturing method can be used to produce the emission layer 205, but optionally also for the production of the transport layers 204 and 206, as well as for the layers forming the ion barrier 202 and the optical index matching layer 208.

[0123] According to this manufacturing method, the deposited material does not form a continuous layer, but is distributed in the plane XY according to a certain grain size, which increases the transparency of the layer and therefore of the light emitting module 200 .

[0124] Therefore, a high degree of transparency of the light emitting module 200 can be obtained, in particular greater than 60%, or even 70%, for example 80%.

[0125] The supply voltage for enabling the emission of photons in the emission layer may be several hundred volts, for example 195 V. Therefore, the control element 240 may control the voltage source that supplies power to the electrodes 203 and 207 to apply such a voltage or not. Thus, the control element 240 may be used to enable and disable the light emitting module 200. The voltage is preferably applied at a high frequency, in particular at a frequency between 400 Hz and 1 kHz.

[0126] Therefore, for about several hundred candela per square meter and up to 1300Cd / m 2 The high brightness has achieved an operating power of several watts, especially between 3W and 12W.

[0127] The light emitting module according to the second embodiment also has the advantage of operating in a wide temperature range, in particular between -100°C and +105°C.

[0128] As a variant, according to a third non-limiting embodiment of the invention, the emission layer 205 may comprise an organic electroluminescent material, for example an organic polymer.

[0129] The light emitting module 200 thus forms an organic light emitting diode (OLED).

[0130] The layers 201 to 204 and 206 to 209 may be the same as those described with reference to the second embodiment.

[0131] According to a fourth non-limiting embodiment of the present invention, the lighting module 200 according to the second and third embodiments further comprises a light guide 105 as disclosed in the first embodiment, the light guide:

[0132] - replaces the substrate 201 or is arranged against the substrate 201; and / or

[0133] Instead of the cover layer 209 or arranged against the cover layer 209 .

[0134] Thus, different light emission patterns may be generated, which may be enabled selectively or cumulatively so as to overlap with the light emission pattern.

[0135] According to one non-limiting embodiment, the light guide 105 may be arranged in place of or against the substrate 201 , the first light guide 105 comprising a first pattern etched into the guide plate 110 , and the emission layer 205 distributed in a second pattern different from the first pattern.

[0136] According to another non-limiting embodiment, the light guide 105 may be arranged in place of or against the cover layer 209, the first light guide 105 comprising a first pattern etched into the guide plate 110, and the emissive layer 205 being distributed in a second pattern different from the first pattern.

[0137] According to another non-limiting embodiment, the first light guide 105 is arranged to replace the substrate 201 or to be arranged against the substrate 201, the first light guide 105 includes a first pattern etched into its guide plate 110, the emission layer 205 is distributed in a second pattern, and the second light guide 105 is arranged to replace the covering layer 209 or to be arranged against the covering layer 209, the second light guide 105 includes a third pattern etched into its guide plate, and the first pattern, the second pattern and the third pattern are different.

[0138] Figure 3 A light emitting device 300 according to a non-limiting embodiment of the present invention is depicted.

[0139] The light emitting device 300 according to the present invention includes at least one light emitting module according to the first embodiment, the second embodiment, the third embodiment or the fourth embodiment. Figure 4 , Figure 5 and Figure 61 to describe an exemplary embodiment of the light emitting module 100 according to the first embodiment. Therefore, the light emitting module 100 according to the first embodiment may be the light emitting module 400 according to the first example, the light emitting module 500 according to the second example, or the light emitting module 600 according to the third example. The light emitting module 200 corresponds to the second embodiment and the third embodiment. The fourth embodiment may combine the light emitting module 200 according to the second embodiment and the third embodiment with one or more of the examples of the light emitting modules 400, 500, and 600 described below, which are arranged to replace the substrate 201 or to be arranged against the substrate 201, and / or to replace the cover layer 209 or to be arranged against the cover layer 209.

[0140] therefore, Figure 3 The lighting modules shown cover all embodiments and are denoted by 100 , 200 .

[0141] As will become clear, the light emitting device 300 may include a plurality of light emitting modules 100 , 200 .

[0142] The light emitting device 300 further includes a lighting module 301.1 or 301.2 capable of projecting light toward the outside of the light emitting device 300 in order to perform at least one lighting function. Such a lighting function may be, for example, a low beam (LB) function or a high beam (HB) function. As a variant, at least one lighting module 301.1 or 301.2 may be controlled, for example, by a control element (CTRL) 340, and may be controlled to perform two different lighting functions, such as a LB function and a HB function. There is no restriction on the technology associated with the lighting module. In particular, there is no restriction on the light source of at least one lighting module 301.1 or 301.2, which may be a source including one light emitting element or multiple light emitting elements (such as one or more LEDs). The light source of the lighting module may be an array source, which may include an array of DMDs, an array of LEDs, or any other array source.

[0143] The light emitting device 300 may optionally include one or more signaling modules 302.1, 302.2 and 302.3 capable of emitting light toward the outside of the light emitting device to perform a signaling function. The signaling module may, for example, be capable of performing a position light PL function or a daytime running light DRL function. In addition, at least one signaling module 302.1, 302.2 and / or 302.3 is capable of performing both a position light PL function and a daytime running light DRL function, wherein only the luminous intensity emitted by the signaling module may be varied between the two functions. Such a variation of the luminous intensity may be obtained by activating / deactivating the luminous source of the signaling module, or by supplying power to the luminous source in pulse width modulation via a change in the duty cycle.

[0144] The light emitting device 300 for a motor vehicle is preferably a motor vehicle headlight, for example a motor vehicle front headlight.

[0145] There is no restriction on the number of lighting modules, lighting modules 100, 200 and signaling modules included in the lighting device 300, and there is no restriction on the corresponding shapes and arrangements of the lighting modules, lighting modules and signaling modules constituting the identification marks of the lighting device 300. The lighting device 300 according to the present invention comprises:

[0146] - at least one lighting module 301.1 or 301.2;

[0147] - at least one lighting module 100, 200 as described above;

[0148] - at least one control element 340;

[0149] - Optionally, at least one signalling module.

[0150] According to the present invention, the light emitting modules 100, 200 are at least partially transparent as described above and are arranged so that the light emitted by at least one lighting module 301.1 or 301.2 passes through the light emitting module. Preferably, the light emitting modules 100, 200 are capable of emitting light in at least one given pattern having the same shape as the optical projection system of at least one light emitting module 301.1 or 301.2.

[0151] By enabling the lighting modules 100, 200 when at least one lighting module 301.1 or 301.2 is disabled, the appearance of the lighting device can be made consistent during the day and at night, in particular, in order to make the identification of the lighting device consistent, as will be understood by reading the following description. Therefore, when the lighting module 100, 200 is placed so that at least one lighting module 301.1 or 301.2 facing it is disabled, the control element 340 can enable the lighting module.

[0152] The light emitting modules 100, 200 may be arranged inside a lens of an optical system of at least one lighting module 301.1 or 301.2.

[0153] According to a non-limiting embodiment, the light emitting device 300 comprises a housing and an outer lens forming a lens for enclosing the housing, and at least one lighting module is positioned inside the internal volume created by the housing and the outer lens so that at least some of the light it projects passes through the outer lens.

[0154] The light module 100, 200 can be arranged on a face of the outer lens of the light emitting device, which is the face facing the optical system of at least one lighting module 301.1 or 301.2. The light module 100, 200 can advantageously be arranged on the inner face of the outer lens, which makes it possible to protect the light module 100, 200 from attacks by the external environment. The light module 100, 200 can also be arranged on the outer face of the outer lens, in particular when the structure of the light module 100, 200 makes it possible to withstand the above-mentioned attacks.

[0155] exist Figure 3 In the particular example shown, the light emitting device 300 comprises:

[0156] - A first lighting module 301.1 and a second lighting module 301.2. For example, the first lighting module 301.1 can perform a low beam LB lighting function, while the second lighting module 301.2 can perform a high beam HB lighting function;

[0157] a first signalling module 302.1 (in two parts: an upper part and a lower part), a second signalling module 302.2 (in two parts: an upper part and a lower part) and a third signalling module 302.3 (in two parts: an upper part and a lower part). Each signalling module 302.1, 302.2 and 302.3 is capable of emitting light towards the outside of the light emitting device to perform a signalling function. Each signalling module may perform its own signalling function or, as a variant, the signalling modules 302.1, 302.2 and 302.3 may perform the same signalling function and thus, for example, be controlled together by the control element 340;

[0158] - A light emitting module 100, 200 covering the two lighting modules 301.1 and 301.2, the light emitting module being capable of displaying a first light emitting pattern facing the first lighting module 301.1 and a second light emitting pattern facing the second lighting module 301.2. As a variant, the light emitting device comprises two light emitting modules 100, 200: a first light emitting module 100, 200 capable of being penetrated by the light from the first lighting module 301.1; and a second light emitting module 100, 200 capable of being penetrated by the light from the second lighting module 301.2.

[0159] The control element 340 is capable of controlling the activation and deactivation of all modules, in other words the lighting module, the lighting module and the optional signaling module. In this case, the control element combines the functionality of the control element 240 described above according to the second and third embodiments. The control element 340 can control the activation or deactivation of each module according to a control signal received, for example, by a central control module of the motor vehicle, such as an electronic control unit (ECU).

[0160] The control element 340 may include a processor configured to communicate unidirectionally or bidirectionally with a memory such as a random access memory (RAM) or a read-only memory (ROM) or any other type of memory (flash memory, EEPROM, etc.) via one or more buses or via a wired connection. As a variant, the memory includes a plurality of memories of the above types. Preferably, the memory is a non-volatile memory. The processor is capable of executing instructions stored in the memory and controlling the modules of the light emitting device 300 according to control signals. Alternatively, the processor may be replaced by a microcontroller designed and configured to implement control of these modules according to received control signals.

[0161] As a variant, each of the lighting modules, the illumination modules and the signalling modules comprises a dedicated control element.

[0162] According to the present invention, the control element 340 can activate the lighting module 100, 200 facing the deactivated lighting module. Therefore, the identification mark of the lighting device 100 composed of the shape of the signaling module and the lighting module and their corresponding arrangement is consistent regardless of whether the lighting module is activated.

[0163] Thus, when the lighting module is deactivated, an external observer does not see a dark area in the area of ​​the lighting module, as is usually the case during the day. The invention thus makes it possible to make the signature of the lighting device 300 uniform.

[0164] According to the second, third and fourth embodiments, therefore, light from the lighting module 301.1 and / or the lighting module 301.2 can pass through at least one light emitting module 200. When the light emitting device 300 includes a single light emitting module 200, the emission layer 205 can form a first pattern arranged to face the lighting module 301.1 and a second pattern arranged to face the lighting module 301.2.

[0165] When the light emitting device 300 includes two light emitting modules 200, the first light emitting module 200 includes an emission layer 205 forming a first emission pattern arranged to face the first lighting module 301.1, and the second light emitting module 200 includes an emission layer 205 forming a second emission pattern arranged to face the second lighting module 301.2.

[0166] When the lighting modules have optical surfaces of different shapes, the light patterns of the light modules 200 vary so that they are identical to the corresponding optical surfaces of the lighting modules they cover. This makes it possible to make complex identification signs consistent between daytime and nighttime hours.

[0167] Several exemplary embodiments are also possible with at least one lighting module 100 according to the first embodiment. Figure 4 , Figure 5 and Figure 6 Describe these examples.

[0168] Figure 4 A first example of a light emitting module 400 of a light emitting device according to a first embodiment of the present invention is shown.

[0169] The light emitting module 400 includes a light guide 405 including a guide plate 410 and an injection element 420 and a light source 430 similar to the light guide 105 and the light source 130 of the light emitting module 100 described above.

[0170] The guide plate 410 is etched such that it reflects light injected by the injection element 420 in a light emitting pattern 450 after the light source 430 is activated by the control element 340 .

[0171] The pattern 450 is arranged to face the optical projection surface of the lighting module. The pattern 450 may also be shaped to overlap the optical projection surface of the lighting module. Thus, the pattern 450 may have the same shape as the projection of the optical projection surface of the lighting module in the plane of the guide plate.

[0172] This makes it possible to illuminate the pattern 450 by activating the source 430 when the lighting module on which the light module 400 is placed is deactivated. Thus, when the lighting module is deactivated, an external observer does not see a dark area in the area of ​​the lighting module, as is the case during the day. Thus, the invention makes it possible to make uniform the signature of a light emitting device comprising a light module 400 arranged on the lighting module.

[0173] The light emitting module 400 can be used, for example, Figure 3 As a variant, the lighting device 300 includes a first lighting module that is the same as the lighting module 400 arranged to face the first lighting module 301.1, and a second lighting module that is the same as the lighting module 400 arranged to face the second lighting module 301.2.

[0174] Therefore, a plurality of light modules 400 according to the first embodiment can be advantageously used in a light emitting device comprising a plurality of lighting modules. When the lighting modules have optical surfaces of different shapes, the patterns 450 of the light modules 400 can be identical to the corresponding optical surfaces of the lighting modules they cover. This makes it possible to make complex identification signs consistent between the daytime and nighttime periods.

[0175] Advantageously, the light source 430 is controlled by the above-mentioned control element 340. The control element 340 can also control the lighting module, facing which the light module 400 is placed. Thus, the control element 340 is able to activate the light source 430 when it deactivates the lighting module.

[0176] exist Figure 3 In the example in , when the first lighting module 301.1 is disabled, the control element 340 may enable the first light emitting module 400 arranged facing the first lighting module 301.1, and when the second lighting module 301.2 is disabled, the control element 340 may enable the second light emitting module 400 arranged facing the second lighting module 301.2.

[0177] Alternatively, refer to Figure 5 and Figure 6 , two variant embodiments of the first embodiment are disclosed, wherein a single light emitting module 500 or 600 according to the first embodiment can be arranged to face at least two lighting modules of a light emitting device.

[0178] Figure 5 A second example of a light emitting module 500 of a light emitting device according to the first embodiment of the invention is depicted, which light emitting module is a variant of the light emitting module 400 described above.

[0179] According to this variant, the lighting module 500 comprises the same Figure 1a to Figure 1c The light guide 105 and the light source 130 of the described light emitting module 100 are similar to the light guide 505 and the light source 530 including the guide plate 510 and the injection element 520 .

[0180] The guide plate 510 is etched such that it reflects light injected by the injection element 520 in a first pattern 550 . 1 and a second pattern 550 . 2 after activation of the light source 530 .

[0181] The first pattern 550.1 is arranged to face the first optical projection surface of the first lighting module, and the second pattern 550.2 is arranged to face the second optical projection surface of the second lighting module. The first pattern 550.1 and the second pattern 550.2 may also be shaped to overlap with the optical projection surfaces of the first lighting module and the second lighting module. Therefore, the first pattern 550.1 and the second pattern 550.2 may have the same shape as the projection of the optical projection surface of the lighting module in the plane of the guide plate 510.

[0182] This makes it possible to illuminate the luminous patterns 550.1 and 550.2 by activating the source 530 when the first and / or second lighting modules on which the luminous modules 500 are placed are deactivated. Thus, when at least one of the luminous modules is deactivated, an external observer does not see a dark area in the area of ​​the luminous modules, as is usually the case during the day. Thus, the invention makes it possible to make the signature of a luminous device including luminous modules 500 arranged on a plurality of luminous modules consistent using a single light guide 505 and a single light source 530. This reduces occupied space and costs.

[0183] The light emitting module 500 can be used, for example, Figure 3 In the example in FIG. 1 , the lighting modules 301 . 1 and 301 . 2 are thereby arranged to face the lighting modules 301 . 1 and 301 . 2 .

[0184] Therefore, a single lighting module 500 can be advantageously used in a lighting device comprising a plurality of lighting modules. When the lighting modules have optical surfaces of different shapes, the patterns 550.1 and 550.2 have different shapes so that they are identical to the corresponding optical surfaces of the lighting modules they cover. This makes it possible to make complex identification signs consistent between daytime and nighttime periods.

[0185] Advantageously, the light source 530 is controlled by the above-mentioned control element 340. The control element 340 can also control the lighting modules, facing which the lighting module 500 is placed. Thus, the control element 340 is able to activate the light source 530 when it deactivates at least one of the lighting modules of the lighting device.

[0186] exist Figure 3 In the example, when the first lighting module 301.1 is disabled, when the second lighting module 301.1 is disabled, or when the first lighting module 301.1 and the second lighting module 301.2 are disabled, the control element 340 may enable the light emitting module 500 arranged facing the first lighting module 301.1 and the second lighting module 301.2.

[0187] Figure 6 A light emitting module 600 according to a first embodiment of the invention is depicted, which light emitting module is a variant of the light emitting modules 400 and 500 described above.

[0188] According to this variant, the lighting module 600 comprises a light guide 605 comprising a guide plate 610, a first injection element 620.1 and a second injection element 620.2, and a first light source 630.1 and a second light source 630.2. These elements are similar to those according to the above reference Figure 1a to Figure 1c The light guide 105 and the light source 130 of the light emitting module 100 of the first embodiment are described to be similar.

[0189] The guide plate 610 is etched with a first pattern 650 . 1 in a first portion of the guide plate 610 and a second pattern 650 . 2 in a second portion of the guide plate 610 .

[0190] The first light source 630.1 can inject light into the first injection element 620.1 which itself can inject or distribute light into the first part of the guide plate for illuminating the first light pattern 650.1. To this end, the first injection element 620.1 faces a first section of the light injection edge 114 of the guide plate 610.

[0191] The second light source 630.2 can inject light into the second injection element 620.2, which itself can inject or distribute light into the second portion of the guide plate 610 in order to illuminate the second pattern 650.2. To this end, the second injection element 620.2 faces a second section of the injection edge 114 of the guide plate 610 different from the first section.

[0192] In the light emitting device, the first pattern 650.1 may be arranged to face the first optical projection surface of the first lighting module, and the second pattern 650.2 may be arranged to face the second optical projection surface of the second lighting module. The first pattern 650.1 and the second pattern 650.2 may be further formed to overlap with the optical projection surfaces of the first lighting module and the second lighting module. Therefore, the light emitting patterns 650.1 and 650.2 may have the same shape as the projection of the optical projection surfaces of the lighting modules in the plane of the guide plate 610.

[0193] This makes it possible to illuminate patterns 650.1 and 650.2 by selectively enabling sources 630.1 and 630.2. When the first lighting module is deactivated, the first light source 630.1 can be enabled. When the second lighting module is deactivated, the second light source 630.2 can be enabled. Thus, sources 630.1 and 630.2 can be controlled individually, for example, by control element 340.

[0194] As a variant, the control element 340 enables the sources 630.1 and 630.2 simultaneously and thus displays the first 650.1 and the second 650.2 lighting patterns when at least one of the first and second lighting modules is deactivated.

[0195] Thus, when at least one of the lighting modules is deactivated, an external observer does not see a dark area in the area of ​​the lighting modules, as is usually the case during the day. Thus, the invention makes it possible to make the signature of a lighting device comprising a lighting module 600 arranged on a plurality of lighting modules consistent by using a single light guide 605 and making it possible to selectively illuminate the first pattern 650.1 and the second pattern 650.2.

[0196] The light emitting module 600 can be used, for example, Figure 3 In the example in FIG. 1 , the lighting modules 301 . 1 and 301 . 2 are thereby arranged to face the lighting modules 301 . 1 and 301 . 2 .

[0197] Therefore, a single lighting module 600 can be advantageously used in a lighting device comprising a plurality of lighting modules. When the lighting modules have optical projection surfaces of different shapes, the first pattern 650.1 and the second pattern 650.2 have different shapes so that they are identical to the corresponding optical surfaces of the lighting modules they cover. This makes it possible to make complex identification signs consistent between daytime and nighttime periods.

[0198] Advantageously, the light sources 630.1 and 630.2 are controlled by the above-mentioned control element 340. The control element 340 can also control the lighting modules, facing which the light module 600 is placed. Thus, the control element 340 is able to selectively enable the light sources 630.1 and 630.2 when it deactivates at least one of the light modules of the light emitting device.

[0199] exist Figure 3 In the example in FIG, the control element 340 may enable the light source 630.1 to emit light in a first light emission pattern 650.1 arranged facing the first lighting module 301.1 when the first lighting module 301.1 is deactivated, and enable the light source 630.2 to emit light in a second light emission pattern 650.2 arranged facing the second lighting module 301.2 when the second lighting module 301.2 is deactivated.

[0200] In the first, second, third and fourth embodiments described above, the pattern of the light emitting modules 100, 200 can be controlled according to the activation of one of the signaling modules. The control element 340 can specifically control the light emitting modules 100, 200, the lighting module, and also control one or more signaling modules, such as Figure 3 In particular, when the daytime running light DRL signaling function is enabled on at least one of the signaling modules responsible for this signaling function, the control element 340 can advantageously enable the light sources of the lighting modules 100, 200. Since this function is enabled during the day, it is ensured that the light sources of the lighting modules are enabled during the day, which makes it possible to make the identification signs of the lighting device 300 consistent between the situations of daytime driving and night driving.

Claims

1. A lighting device (300) for a motor vehicle, the lighting device comprising at least one lighting module (301.1; 301.2) capable of projecting light to perform a lighting function, a lighting module (100; 200; 400; 500; 600), and a control element (240; 340); in, The lighting modules are at least partially transparent and are arranged such that light emitted by the lighting modules passes through the lighting modules, and wherein the control element is capable of activating the lighting modules when the at least one lighting module is deactivated.

2. The light emitting device according to claim 1, wherein: The at least one lighting module (301.1; 301.2) is capable of performing a low-beam lighting function and / or a high-beam lighting function.

3. The light-emitting device as described in claim 2 comprises a first lighting module (301.1) capable of performing a low beam lighting function and a second lighting module (301.2) capable of performing a high beam lighting function, and the light-emitting modules (100; 200; 400; 500; 600) are arranged so that light from the first lighting module and / or the second lighting module passes through the light-emitting modules.

4. A lighting device as claimed in any one of the preceding claims, wherein: The light emitting module (100; 200; 400; 500; 600) is capable of emitting light in at least one light emitting pattern (450; 550.1; 550.2; 650.1; 650.2), the light emitting modules being arranged such that the at least one light emitting pattern faces an optical surface of the at least one lighting module (301.1; 301.2).

5. A lighting device as claimed in any one of the preceding claims, wherein: The light emitting module (100; 200; 400; 500; 600) is arranged inside a lens of the optical system of the at least one lighting module (301.1; 301.2).

6. The light emitting device according to any one of claims 1 to 4, wherein: The light emitting module (100; 200; 400; 500; 600) are arranged on the outer lens of the light emitting device (300).

7. A lighting device as claimed in any one of the preceding claims, wherein: The light emitting module (100; 400; 500; 600) comprises: - a light guide (105; 405; 505; 605) comprising an at least partially transparent guide plate (110; 410; 510; 610), the guide plate being capable of receiving light through at least one light injection edge (114) of the guide plate and reflecting the light in at least one luminous pattern in a direction that is locally substantially perpendicular to a surface of the guide plate, the light guide further comprising at least one light injection element (120; 420; 520; 620.1; 620.2), said at least one light injection element being capable of receiving light and distributing said light in said guide plate; - at least one light source (130; 430; 530; 630.1; 630.2) capable of injecting light into the at least one light injection element; The control element is capable of activating the at least one light source when the at least one lighting module (301.1; 301.2) is deactivated.

8. The lighting device according to claims 3 and 7, comprising a first lighting module (301.1) capable of performing a low-beam lighting function and a second lighting module (301.2) capable of performing a high-beam lighting function, wherein: The light emitting module (500) comprises a single light guide (505), a first pattern (550.1) being etched into a first portion of a guide plate (510) of the single light guide, and a second pattern (550.2) being etched into a second portion of the guide plate of the single light guide, wherein the first pattern is arranged to face a first optical projection surface of the first lighting module (301.1), and the second pattern is arranged to face a second optical projection surface of the second lighting module (301.2).

9. The light emitting device according to any one of claims 1 to 6, wherein: The light-emitting module (200) includes an at least partially transparent substrate (201), an emission layer (205), the emission layer including an electroluminescent material contained between a first electrode (203) and a second electrode (207), the first electrode being contained between the substrate layer and the emission layer, wherein the control element (240; 340) is capable of controlling a voltage source capable of applying a voltage between the first electrode and the second electrode, so that the emission layer emits light toward the outside of the light-emitting module.

10. The light emitting device according to claim 9, wherein: The first electrode (203), the second electrode (207) and the emission layer (205) each have a thickness of less than 10 micrometers, in particular less than one micrometer.

11. A lighting device as claimed in one of claims 9 and 10, wherein: The light emitting module (200) further comprises an at least partially transparent protective layer (209), for example made of glass, the second electrode (207) being comprised between the protective layer and the emitting layer (205).

12. The lighting device according to any one of claims 9 to 11, wherein: The electroluminescent material is an inorganic electroluminescent material, in particular an inorganic electroluminescent material comprising zinc sulfide doped with manganese.

13. A lighting device according to any one of claims 9 to 12, wherein: The electroluminescent material is an organic electroluminescent material, in particular an electroluminescent organic polymer.

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