Light device for object detection

Abstract

One aspect of the invention relates to a light device (100) for a motor vehicle, the light device comprising: - a plurality of light modules (110) emitting pulsed visible light, which light is modulated by means of a high-frequency light code, each light module (110) comprising at least two sectors (151, 152, 153) each grouping a plurality of light-emitting diodes (130) around a driver circuit (120); and - a device for receiving the light emitted by each of the light modules (110) after it has reflected off an object (20), wherein the light module (110) comprises a delay-locked loop (140) connected to the driver circuit (120) of each of the sectors (151, 152, 153) to ensure synchronisation of the driver circuits. Another aspect of the invention relates to a driver assistance system of a motor vehicle, the system comprising at least one such light device (100).

Description

DESCRIPTION TITLE: Light device for object detection TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a lighting device for a motor vehicle, adapted for object detection. The invention also relates to a driver assistance system for a motor vehicle comprising this lighting device. TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0002] With the development of autonomous vehicles, driver assistance systems have improved significantly in recent years. One of the most useful is the system that detects pedestrians or objects in the vehicle's environment.

[0003] Devices for detecting the presence of pedestrians or objects in the vehicle's environment, simply called object detection devices, are well-known. These devices generally use Lidar (Light Detection and Ranging) technology, which relies on analyzing the properties of a light beam, usually a laser beam, emitted by a specific light source and reflected by the object. With Lidar technology, the distance between the light source and the object is measured from the time lag between the emission of a laser pulse and the reception of the reflected pulse. An object detection device using Lidar is relatively simple to implement because the light source emits a single, high-power infrared signal that bounces off the object; the time of flight of the infrared signal is measured by a sensor upon its reception.However, such an object detection device requires specific equipment to emit the infrared signal and to receive the bounced signal.

[0004] To ensure a detection rate and / or false-positive rate that meets the standard, complementary technologies are necessary. To achieve this, three assistance devices based on different technologies are generally combined; the data generated by these different assistance devices are cross-referenced, and final data is generated to inform the driver, or the vehicle itself in the case of an autonomous vehicle, of the The presence of a pedestrian or object in the vehicle's vicinity. However, adding three separate devices to the same area of ​​the vehicle increases the load on an area already heavily congested.

[0005] To address space constraints, object detection using existing vehicle lighting, such as daytime running lights, was considered. However, the light source in current lighting systems is typically an array of light-emitting diodes (LEDs) controlled by a driver circuit. LEDs in vehicle lighting systems emit continuous visible light, making them difficult to detect after reflection from an object, especially when combined with natural sunlight, streetlights, and other external light sources. To facilitate the detection of the light emitted by the LEDs and reflected by the object, modulating the light was proposed; the LED beam would then be pulsed and modulated by a high-frequency code.However, to be effective, and therefore detectable, the modulation of the light beam must be precise; the LEDs forming the light source must all emit their light beams simultaneously to avoid interference. The current trend, however, is to deploy LEDs in lines, arrays, or grids for stylistic effects, which results in some of them being located further away from the driver circuit that controls them. The fact that the LEDs are more or less distant from the driver circuit causes a time lag in the emission of the light beam from some LEDs compared to others. This lag causes a spreading of the signal emissions over time, which has two consequences. First, this emission lag affects the signal that has been reflected off an object and is re-emitted towards a sensor on the vehicle.Therefore, it becomes more difficult to determine the time lag between the emission of a light pulse and the reception of the reflected pulse. Secondly, pulse spreading degrades the signal-to-noise ratio. Indeed, all other things being equal, the intensity of a single simultaneous pulse is more easily detected by the sensor than the intensity of multiple emissions spread out over time. SUMMARY OF THE INVENTION

[0006] To address the aforementioned problems of interference and time lag in LED emission, the applicant proposes a light device suitable for object detection, in which the LEDs are grouped by sectors around a drive circuit that supplies them with electricity, the drive circuits being synchronized by means of a latching delay loop.

[0007] According to a first aspect, the invention relates to a lighting device for a motor vehicle comprising: at least one first lighting module configured to emit pulsed visible light, modulated to transmit a high-frequency light code, the at least one first lighting module comprising at least two sectors, each grouping several light-emitting diodes electrically powered by a driver circuit configured to modulate, according to the high-frequency code, an electrical power received by the light-emitting diodes in order to emit the pulsed visible light, and a device for receiving the light emitted by the at least one first lighting module, to receive the light code after reflection of the pulsed light emitted by the at least one lighting module on an object,wherein at least one first light module includes a latching delay loop connected to the drive circuit of each sector of the respective light module to ensure synchronization of the modulation according to the code by said drive circuits.

[0008] A lighting device is a lighting element configured for mounting in the vehicle, and preferably comprises a housing configured for mounting in the vehicle, in which a lighting module is mounted. Preferably, several lighting modules are mounted in the housing.

[0009] A lighting module is preferably a set of components joined together. Preferably, a lighting module can be mounted in the housing of a lighting device. Preferably, the lighting module is configured to perform or participate in regulatory lighting or signaling functions. When the lighting module participates in the performance of a function of signaling or lighting, it is understood that at least one other light module, for example included in another light device, completes the realization of the function.

[0010] Light-emitting diodes (or LEDs) are light-emitting sources that emit incoherent light, known to be well-suited for use in signaling devices or automotive lighting, as opposed to laser sources (including laser diodes). Laser sources emit temporally and spatially coherent light, and have the disadvantage of posing risks to eye safety that must be mitigated by complex and costly means.

[0011] It is understood that the drive circuits are connected to the LEDs in their respective sectors so as to supply them with electrical power, while simultaneously modulating the power received by the LEDs at a high frequency, according to the code, so that the light emitted by the LED is modulated according to the code. Preferably, a drive circuit can function as a high-frequency switch, capable of alternately blocking or allowing the flow of electrical power intended to supply power to the LEDs in the sector of the drive circuit. Alternatively, the drive circuit is equipped with means, passive or preferably active, capable of adapting the electrical power supplied to the LEDs in the sector of the drive circuit according to the received code, so as to guarantee the correct transmission of the code in the form of pulsed light.

[0012] The lighting devices according to the invention fulfill, or at least contribute to, lighting and / or signaling functions known to those skilled in the art. Lighting functions include, for example, high beam, front fog light, and low beam functions. Signaling functions include, for example, position light (known to those skilled in the art as PL, for Position Light), turn signal, and daytime running light (also known to those skilled in the art as DRL, for Daytime Running Light).The said daytime running and position lights are particularly advantageous for an embodiment of the invention because these functions can be performed by the same light-emitting diodes; thus, the same light-emitting diodes can contribute to a detection function at night and during the day, while also fulfilling a regulatory signaling function. A lighting device suitable for this purpose is thus obtained. contribute to a detection function, making it possible to avoid costs associated with a lighting device dedicated to a detection function while fulfilling a regulatory function.

[0013] Furthermore, the lighting device according to the invention is particularly well-suited for implementing a complex DRL / PL function in which several sectors, each containing a plurality of LEDs, are used to create a distinctive vehicle style. In such lighting devices, it is common to find numerous LEDs distributed within the same module, for example, at least 12 LEDs, preferably 30 LEDs, arranged, for example, in lines, arrays, or grids. In a device according to the invention, these LEDs are distributed among several sectors, each powered by a driver circuit that supplies the LEDs in its respective sector.

[0014] A device adapted for implementing a DRL / PL function allows for the implementation of a detection function using a large proportion of the LEDs required for the signaling function. By "large proportion," we mean that more than 50% of the LEDs allocated to the function transmit the code, preferably more than 75%, and ideally all of the LEDs transmit the code. This is particularly relevant when the LEDs are similar in terms of luminous flux and activation current characteristics. In this way, since the majority of the LEDs participate in the signaling function by illuminating objects in front of the vehicle, the detection of the pulsed light from the LEDs is not interfered with by the detection of non-pulsed light emitted by the same function. This results in an improved signal-to-noise ratio for the sensor's reception of the light code.

[0015] Alternatively, if the lighting function is performed by dissimilar LEDs, it is advantageous for LEDs representing more than 50% of the luminous flux allocated to the function to transmit the code, preferably more than 75% of this flux, preferably all of this flux.

[0016] Similarly, it is advantageous to implement lighting functions such as low beam and high beam using light-emitting diodes (LEDs) whose power supply is modulated at high frequency to transmit the signal. Several LEDs are commonly used for this purpose. dipped beam and main beam headlights, sometimes within the same light module, for example a dual-function light module. It is then preferable to use at least one driver circuit capable of modulating at high frequency the power supply to the LEDs of a sector grouping the first LEDs necessary for the dipped beam function, according to the code, and a driver circuit capable of modulating at high frequency the power supply to the second LEDs of a sector grouping the LEDs necessary for the main beam function, according to the same code, in a manner synchronized with the power supply to the sector of the first LEDs.In another example, the high beam and / or low beam functions include individually switchable LEDs, for example, to emit a partial high beam in which lighting zones are activated or deactivated, or, alternatively or cumulatively, a low beam in which LEDs corresponding to a light break are activated or deactivated so as to shift a central area of ​​a break zone horizontally relative to the vehicle when the lighting device is mounted on the vehicle, thus achieving a directional low beam function, known as DBL (Dynamic Bending Light). In this way, since most of the LEDs emit pulsed light modulated according to the code, the detection of the pulsed light from the LEDs is not interfered with by the detection of non-pulsed light emitted by the same function.The signal-to-noise ratio of the light code reception by the sensor is improved.

[0017] With sector-specific LEDs and a time-delay latching loop connected between the drive circuits of the different sectors, the light module of this lighting device is capable of synchronously emitting all the light rays forming the light beam of the lighting device, without risk of interference. The lighting device according to the invention is thus suitable for object detection.

[0018] In addition to the characteristics mentioned in the preceding paragraph, the lighting device according to one aspect of the invention may have one or more additional characteristics from among the following, considered individually or in all technically possible combinations: The latching delay loop is connected to an internal clock in each of the driver circuits so as to synchronize the clock of a leading driver circuit with the clock of a lagging driver circuit. In each sector, the LEDs are connected to the driver circuit by conductive tracks, all conductive tracks in the same sector having the same track length so that all the LEDs in the same sector are controlled synchronously by the driver circuit. In each sector, the length of the conductive tracks is equal to the distance between the driver circuit and the LED furthest from said driver circuit, the conductive tracks of the LEDs closest to the driver circuit forming delay lines. The receiving device includes at least one light sensor and a blue light optical filter.The receiving device is connected to a computing unit that determines the time of flight of modulated pulsed light waves and the distance between the object and the light device. For each sector of at least one first light module, the LEDs of the sectors are grouped on the same substrate, in particular of type FR4 or SMI. For each light module, the LEDs of the same light module are grouped on the same substrate, in particular of type FR4 or SMI. The device includes, in addition to at least one first light module, at least one second light module connected to the time-delay latching loop of at least one first light module.

[0019] By setting the clock of an attack circuit ahead of the clock of an attack circuit behind, it is understood that the clock of the two circuits are brought back to the same clock value, so that the modulation of the code by the two attack circuits is simultaneous, up to a residual.

[0020] A second aspect of the invention relates to a driving assistance system for a motor vehicle, characterized in that it comprises at least a first and a second light device according to the first aspect, combined with each other for the detection of the same object.

[0021] A third aspect of the invention relates to a driving assistance system for a motor vehicle, characterized in that it comprises at least one first object detection device in the environment of the motor vehicle, the light device according to the first aspect constituting a second object detection device providing redundancy to the first object detection device. BRIEF DESCRIPTION OF THE FIGURES

[0022] Other advantages and features of the invention will become apparent from the following description, illustrated by the figures in which:

[0023] Figure 1 schematically represents an example of a vehicle equipped with lighting devices according to the invention;

[0024] Figure 2 schematically represents an example of modulated light pulses emitted by a light device according to the invention;

[0025] Figure 3 schematically represents an example of a control signal emitted by a drive circuit connected to a latching delay loop according to the invention; and

[0026] Figure 4 schematically represents an example of a light module comprising drive circuits connected to a delay locking loop according to the invention.

[0027] In the figures, identical elements are identified by identical references. For reasons of readability of the figures, the size scales between the elements represented are not respected. DETAILED DESCRIPTION

[0028] An example of an embodiment of a lighting device according to the invention is described in detail below, with reference to the accompanying drawings. This example illustrates the features and advantages of the invention. It should be noted, however, that the invention is not limited to this example.

[0029] An example of a motor vehicle 10 equipped with two lighting devices 100 according to the invention is shown in Figure 1. This example shows a Pedestrian 20 is crossing in front of vehicle 10. Vehicle 10 is equipped with two lighting devices 100, for example daytime running lights, which illuminate the road scene SR in front of the vehicle. The lighting devices 100 are integrated into a driver assistance system that enables the pedestrian 20 to be detected.

[0030] The lighting device 100 according to the invention can be any basic lighting device present on a vehicle. The lighting device 100 can, for example, be a daytime running light, a position light, a signal light, a side light strip, a front light grille, or any other external lighting device normally integrated on a vehicle to enable its visibility on the road; the lighting device is then used for the detection of pedestrians or objects on the road or in the vehicle's external environment. The lighting device can also be an internal vehicle lighting device; it can then be used for the detection of objects or people inside the vehicle.

[0031] The 100 light device is used to emit pulsed light, modulated by a high-frequency light code. This light code is a binary cyclic code composed of a succession of 1s and 0s, with 1s corresponding to a pulse and 0s to no light emission. The light beam emitted by the LEDs within the light device is modulated to transmit the light code. The LEDs thus emit a succession of light pulses at a rate of approximately 10 to 20 ns, which corresponds to a high modulation frequency for the LED power supply: 10 MHz to 400 MHz, preferably 30 MHz to 200 MHz, and preferably 50 to 100 MHz. An example of a code is shown in part A of Figure 2 and an example of light pulses corresponding to this code is shown in part B of Figure 2. It should be noted that by emitting a high-frequency light beam modulated by this code, the human eye does not perceive this modulation.To the human eye, the light beam is continuous; the light code is invisible. The light code emitted via modulation of the light beam can therefore be used for object detection.

[0032] As schematically represented in Figure 4, a lighting device 100 according to the invention comprises several lighting modules 110, each of which includes at least two driver circuits 120 and several white LEDs 130, arranged in sectors 151, 152, 153. A driver circuit 120, also called a driver, is a component that supplies direct current to the LEDs to which it is connected. connected. A driver circuit 120 therefore controls several LEDs 130. According to the invention, the light module 110 comprises several sectors 151, 152, 153, each comprising a driver circuit 120 to which several LEDs 130 are connected. In the example of Figure 4, the light module 110 comprises three sectors 151, 152, 153, each comprising a driver circuit 120 and three LEDs 130. A sector 151, 152, 153 is a geographical area of ​​the light module in which a driver circuit 120 is connected to LEDs 130, all positioned in the vicinity of the driver circuit 120, at relatively short distances from said driver circuit. The sector-based organization of the drive circuits and LEDs of the 110 light module allows a drive circuit to be positioned at a relatively short distance from each of the LEDs.Thus, no LED 130 of the light module is far from the driver circuit that controls it; all the LEDs 130 of the same sector 151, 152, 153 are at more or less similar distances from the driver circuit 120 that controls them, which limits or even avoids the risk of time lag when emitting light beams from some of the LEDs.

[0033] In the example shown in Figure 4, the 110 light module comprises three driver circuits and nine LEDs arranged in three sectors. Of course, the number of sectors per light module, the number of driver circuits, and the number of LEDs per sector are given only as examples and may vary depending on factors such as the type of lighting device, the desired lighting effects, the LED arrangement, etc.

[0034] Regardless of the number of sectors 151, 152, 153 and / or driver circuits 120, the light module according to the invention includes a delay-locked loop 140, also called a DLL (for "Delay-locked loop" in Anglo-Saxon terminology). A delay-locked loop 140 is a digital circuit that allows the phase of a clock signal to be changed. Thanks to the DLL, propagation delays are compensated, so that only a small offset remains between the output clock signals.

[0035] In the lighting module according to the invention, the DLL 140 is connected to each of the driver circuits 120 of the module so as to synchronize the commands of all the driver circuits 120 of said module. Indeed, the DLL 140 is connected to the internal clock of each of the driver circuits 120 of the lighting module 110 and monitors these internal clocks to determine if any of these clocks Internal clocks are either ahead or behind each other. If DLL 140 detects that an internal clock is ahead or behind, it intervenes on the internal clock(s) of the leading driver circuit(s) (120) to synchronize these leading internal clocks with the internal clock of the leading driver circuit. In other words, DLL 140 retards the internal clocks of the leading driver circuits (120) so that all driver circuits (120) are synchronized with the internal clock of the leading driver circuit (120).

[0036] In the example in Figure 3, DLL 140 monitors the internal clock of a first drive circuit (clock signal line S1) and the internal clock of a second drive circuit (clock signal line S2), represented as a function of time t. This monitoring indicates that clock signal S1 is ahead of clock signal S2: for example, pulse 111 of signal S1 is emitted before pulse 121 of signal S2. DLL 140 then modifies the transmission phase of clock signal S1 so that the pulses of signal S1 are synchronous with those of signal S2. In the example in Figure 3, after synchronizing clock signals S1 and S2, pulse 114 of signal S1 and pulse 123 of signal S2 are emitted simultaneously: clock signals S1 and S2 are then synchronous.

[0037] The DLL 140 monitors all the driver circuits 120 of the light module 110 in the same way as explained above and synchronizes the clocks of all these driver circuits to make them synchronized. Thus, all the driver circuits 120 of the light module 110 simultaneously control the LEDs 130 to which they are connected. Since the LEDs 130 are all close to a driver circuit, the emission of the different light beams by these LEDs is simultaneous.

[0038] However, if the sector arrangement requires that some LEDs 130 be at a significantly different distance from the driver circuit 120 than the other LEDs in the same sector, for example, sector 151, the potential timing delay caused by this difference in distance can be prevented by connecting all the LEDs 130 in sector 151 to the driver circuit 120 of that sector 151 using conductive traces of identical length. Indeed, as is known in the field of automotive lighting systems, the LEDs 130 and the driver circuits 120 are mounted on a PCB (Printed Circuit Board) or IMS (Insulated Metallized Substrate) substrate, where the LEDs 130 are connected to the driver circuits 120, each by a conductive trace. conductive wires connecting each of the LEDs 130 of a sector to the driver circuit 120 of that sector have equal lengths.

[0039] For example, in the embodiment shown in Figure 4, if the three LEDs 130 of sector 151 are positioned at unequal physical distances from the driver circuit 120 of said sector 151, they can all be connected to the driver circuit 120 by means of conductive tracks (not shown) of equal lengths. All the conductive tracks connecting the LEDs of the same sector to the driver circuit of the sector can be the same length. The length of these conductive tracks is determined based on the LED furthest from the driver circuit. Thus, all the conductive tracks have a length equal to the length of the conductive track used to connect the driver circuit 120 to the LED furthest from said driver circuit.The conductive track connecting the furthest LED 130 to the driver circuit 120 is a standard conductive track; the conductive tracks connecting the driver circuit 120 to the LEDs closest to it form delay lines. All the LEDs 130 in the same sector 151, 152, 153 of the light module can thus be connected equidistant from the driver circuit that controls them.

[0040] The distance between the driver circuit and an LED is a physical distance, that is, a point-to-point length determined between the driver circuit's control output and the LED's input terminal. The concept of "farthest" should therefore be understood in terms of physical distance; the LED farthest from the driver circuit is the LED whose distance to the driver circuit is greatest relative to the distances of the other LEDs to the driver circuit. Similarly, the concept of "closest" should be understood in terms of physical distance; the LED closest to the driver circuit is the LED whose distance to the driver circuit is shortest relative to the distances of the other LEDs to the driver circuit.

[0041] Thus, the physical distance between a driver circuit 120 and the LEDs 130 it controls can vary, while the connection distance between this driver circuit 120 and these LEDs 130 is equal.

[0042] In other words, since all the conductive tracks are of the same length, the conductive tracks of the LEDs closest to the driver circuit have loops and / or detours to generate the delay lines. Thus, when the driver circuit 120 sends a command to emit a light beam, the control signal emitted by the driver circuit 120 is received simultaneously by all the LEDs 130 connected to this driver circuit. The LEDs 130 in the same sector 151, 152, 153 therefore emit their light beam at the same time, in a synchronized manner. In parallel, the driver circuits 120 of the different sectors 151, 152, 153 are also synchronized by means of the DLL 140. There is therefore a first level of synchronization at the level of each sector 151, 152, 153 and a second level of synchronization at the level of the light module. The light beam emitted by all 130 LEDs of the light module 110 is therefore necessarily synchronous, which allows efficient modulation of the light beam, with all the light rays from the LEDs of the module simultaneously emitting the same bit of the light code.

[0043] The light module 110, as described above, emits a synchronously modulated light beam. To enable object detection, this light module is associated with a device for receiving the light beam reflected by the object (not visible in the figures). This receiving device is integrated into the light device 100 of the invention. It receives the light beams after they have been reflected by the object to be detected. This receiving device comprises a sensor or set of light sensors; these sensors may be, for example, photon counters, preferably avalanche diodes. The photon counters are preferably distributed on a single high-density substrate, preferably in such a way as to constitute a detection matrix.The sensor is preferably used with a blue light optical filter, that is, a bandpass filter designed to capture only blue wavelength light and block all other wavelengths. Indeed, white LEDs suitable for signaling have an electroluminescent chip emitting blue light, onto which a suitable phosphor is applied to transform some of the blue light into yellow light. The mixture of the untransformed blue light emitted by the chip and the yellow light transformed by the phosphor results in white light. Similarly, amber LEDs suitable for signaling have a chip emitting blue light onto which a suitable phosphor is applied. The blue light optical filter separates the blue light, which constitutes the majority of the light beam, into... a specific wavelength corresponding to the emission line of the light-emitting chip, emitted by the light module 110 and reflected by the object 20 from the rest of the light spectrum coming from the sun or any other external light sources emitting visible light in the vehicle's environment. In this way, the signal-to-noise ratio of the detection is greatly improved.

[0044] This receiving device is connected to a processing unit, mounted in the lighting unit or housed elsewhere in the vehicle, preferably directly on the sensor, which determines the time of flight of the light beam and deduces the distance between the vehicle and the detected object. The time of flight is the propagation time of the light beam emitted by the lighting module 110 through the environment; that is, the time required for the light beam to travel to the object and back to the receiving device. The distance between the object and the vehicle is determined from this time of flight. It is therefore clear that the fact that the light beam is emitted synchronously by the lighting module 110 improves the determination of the time of flight. It is also clear that the "object detection" function can be implemented by the lighting unit 100 in parallel with its standard lighting function.

[0045] The light device 100 as just described can be used alone for object detection, especially if the light device is an interior lighting device in the vehicle.

[0046] The 100 light device can also be used in combination with another similar light device. Two 100 light devices, for example, the two front lights of the vehicle, can be combined to detect the same object.

[0047] The 100 light device can also be integrated into a driver assistance system for a motor vehicle. Indeed, driver assistance systems generally require the combination of two, or even three, distinct object detection devices, i.e., devices operating using different technologies. These object detection devices must be complementary. The light device according to the invention can constitute one of these object detection devices. It has the advantage of using a specific technology not yet employed, since it ensures object detection by means of a A visible light beam. It has the added advantage of not adding mass or bulk, since it uses a lighting system already present on the vehicle. Furthermore, it can be implemented on multiple lighting systems on the same vehicle (for object detection in the same area of ​​the vehicle or in different areas) without risk of interference, simply by choosing a different light code for each lighting system used.

[0048] Although described through a number of examples, variations, and embodiments, the lighting device according to the invention includes various variations, modifications, and improvements that will be obvious to those skilled in the art, it being understood that these variations, modifications, and improvements form part of the scope of the invention. For example, upon reading this application, those skilled in the art will understand that it is easy to apply its principles to other lighting devices on the exterior of the motor vehicle, for example, rear signal lights of the motor vehicle.

Claims

CLAIMS

1. Luminous device (100) for a motor vehicle comprising: - at least one light module (110) configured to emit pulsed visible light, modulated to transmit a high-frequency light code, the at least one first light module (110) comprising at least two sectors (151, 152, 153) each grouping several light-emitting diodes (130) and a driver circuit (120), each of the light-emitting diodes being electrically powered by the driver circuit (120) of the respective sector, to modulate according to the high-frequency code an electrical power received by the light-emitting diodes of the respective sector in order to emit the pulsed visible light, and - a device for receiving the light emitted by the at least one first light module (110), for receiving the pulsed light, modulated according to the code, after reflection of the pulsed light emitted by the at least one first light module on an object outside the vehicle (20), - wherein the modulation frequency is greater than 10MHz, and wherein the at least one first light module (110) comprises a delay-locked loop (140) connected to the driver circuit (120) of each of the sectors (151, 152, 153) of the respective light module to ensure synchronization of the modulation according to the code by said driver circuits.

2. A lighting device according to the preceding claim, characterized in that the delay-locked loop (140) is connected to an internal clock of each of the driver circuits (120) so as to set the clock of a driver circuit ahead of the clock of a driver circuit behind.

3. A light device according to one of the preceding claims, characterized in that, in each sector (151, 152, 153), the light-emitting diodes (130) are connected to the drive circuit by conductive tracks, all the conductive tracks of the same sector having the same track length so that all the light-emitting diodes (130) of a same sector (151, 152, 153) are controlled synchronously by the driver circuit.

4. Luminous device according to the preceding claim, characterized in that, in each sector (151, 152, 153), the length of the conductive tracks is equal to the distance between the driver circuit (120) and the light-emitting diode furthest from said driver circuit, the conductive tracks of the light-emitting diodes least distant from the driver circuit forming delay lines.

5. Luminous device according to any one of the preceding claims, characterized in that, for each sector of the at least one first luminous module, the light-emitting diodes (130) of the sectors are grouped on the same substrate, in particular of the FR4 or SMI type.

6. A lighting device according to any one of the preceding claims, characterized in that the device comprises, in addition to the at least one first lighting module, at least one second lighting module connected to the delay-locked loop of the at least one first lighting module.

7. Luminous device according to any one of the preceding claims, characterized in that the receiving device comprises at least one light sensor and a blue light optical filter.

8. A light device according to any one of the preceding claims, characterized in that the receiving device is connected to a calculation unit ensuring the determination of a time of flight of modulated pulsed light waves and a distance measurement between the object (20) and the light device (100).

9. Driving assistance system for a motor vehicle, characterized in that it comprises at least a first device for detecting an object located in the environment of the motor vehicle, in particular a radar, a, the light device (100) according to one of claims 1 to 6 constituting a second object detection device ensuring redundancy for the first object detection device.

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