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    • 专利摘要:
    The invention proposes a light device (1) for a motor vehicle comprising a first light module (2) capable of projecting a first pixelated beam (HR) in a first resolution and a second light module (3) capable of projecting a second beam pixel-like crossing type (LB) according to a second resolution lower than the first resolution, the first and second light modules being arranged so that the first and second beams overlap at least partially vertically to form a global beam (LBG), the device comprising a control unit (4) able to selectively control a plurality of pixels (HRM) of the first and second beams so as to project a pattern into the overall beam, characterized in that the control unit is arranged so that controlling at least one pixel of each of the first and second beams when the motor vehicle approaches a turn so create a displacement of said pattern in the overall beam.
    公开号:FR3079468A1
    申请号:FR1852898
    申请日:2018-04-03
    公开日:2019-10-04
    发明作者:Sebastien ROELS；Marie PELLARIN；Sophie Clade
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    LIGHT DEVICE FOR A MOTOR VEHICLE CARRYING OUT A WRITING FUNCTION ON THE GROUND
    The invention relates to the field of lighting and / or light signaling, in particular for a motor vehicle. More particularly, the invention relates to a light device for a motor vehicle capable of projecting a pixelated light beam in order to project information on the road intended for the driver of the vehicle.
    In order for the information that this device projects on the road to be clearly perceptible to the driver, it is necessary that the pixelated light beam has a particularly high resolution. However, the technologies necessary to reach such resolutions are expensive, in particular when it is desired to obtain a wide light beam, which is compulsory in the case of a beam of the crossing type.
    In order to reduce the price of the light device, it has thus been proposed, for example in patent document EP 2 772 682, to divide the beam of the crossing type into a base beam to which a reduced pixel pixel beam is superimposed. In this way, the overall beam has an acceptable horizontal amplitude for a crossing type beam and a pixelated area which can be used for projecting a pattern in this overall beam, by contrast between this pixelated area and the base beam.
    If this solution effectively optimizes the cost of the lighting device, it nevertheless poses a problem when it is desired to implement a dynamic cornering lighting function. This function consists in modifying the light characteristics of the crossing type beam when the vehicle approaches a bend to improve the visibility of the driver in the bend without dazzling other road users. For example, the horizontal amplitude of the crossing type beam is increased in the direction of the turn or the maximum intensity of the crossing type beam is shifted in the direction of the turn.
    However, in this case, due to the modification of the light characteristics of the base beam, it is possible that the contrast between the pixelated area and the base beam is no longer sufficient to allow the driver to perceive the pattern projected into the beam. overall or that this contrast changes suddenly, causing a sudden change in the pattern which can disturb the driver.
    The invention aims to overcome this problem and more specifically to provide a solution for projecting a pattern in a beam of the crossing type, this pattern remaining perceptible without abrupt change during the implementation of a lighting function cornering dynamics.
    To this end, the invention provides a light device for a motor vehicle comprising a first light module capable of projecting a first pixelized beam in a first resolution and a second light module capable of projecting a second beam of pixelated type crossing in a second resolution lower than the first resolution, the first and second light modules being arranged so that the first and second beams overlap at least partially vertically to form a global beam, the device comprising a control unit capable of selectively controlling a plurality of pixels of the first and second beams so as to project a pattern into the overall beam.
    According to the invention, the control unit is arranged so as to control at least one pixel of each of the first and second beams when the motor vehicle approaches a turn so as to create a displacement of said pattern in the overall beam.
    Thanks to the invention, the pattern is moved simultaneously with the displacement of the characteristics of the global beam, so that the contrast between the first and second light beams making it possible to generate this pattern remains constant when the dynamic lighting function turn is implemented. This guarantees the perceptibility of the pattern, without abrupt variation in contrast.
    Advantageously, the first and second light modules are arranged so that: the first pixelized beam has a number of pixels greater than the pixel number of the second beam of pixelated crossing type; and / or each pixel of the first pixelized beam has a width and / or a length that is strictly less than the minimum width and / or the minimum length of the pixels of the second pixelated crossover type beam respectively;
    the first pixelized beam has a horizontal amplitude less than the horizontal amplitude of the second pixelized crossover type beam.
    The width and the pixel length respectively mean the width and respectively length of this pixel when it is projected onto the road or onto a screen, for example placed 25 meters from the light device. These dimensions, measured in degrees, correspond to the angular openings of the selectively activatable elementary beams which make up the first and second pixelized beams.
    The resolution of the first and second pixelized beams can thus be estimated by the number and dimensions of the pixels making up these beams with respect to the amplitudes of these beams.
    According to one embodiment, the first light module can be arranged so that the first pixelated beam has at least 400 pixels, or even at least 1000 pixels, or even at least 2000 pixels. This first pixelated beam can for example comprise 20 columns and 20 rows of pixels, in particular 32 columns and 32 rows of pixels.
    Advantageously, the first module can be arranged so that each pixel of the first pixelated beam has a width and / or a length of less than 1 °, in particular less than 0.5 °, or even less than 0.3 °.
    Advantageously also, the first light module can be arranged so that the first pixelized beam has a vertical amplitude of at least 5 °, in particular of at least 9 °, and a horizontal amplitude of at least 5 °, in particular of minus 12 °.
    The first module can for example include:
    a pixelated light source comprising a plurality of elementary emitters arranged in a matrix, each of the elementary emitters being selectively activatable to emit an elementary light beam; and an optical projection element associated with said pixelated light source for projecting each of said elementary light beams in the form of a pixel, the set of pixels forming said pixelized beam.
    Advantageously, the optical projection element is arranged so that the pixelated beam has a vertical amplitude of at least 5 ° and a horizontal amplitude of at least 5 °. These horizontal and vertical amplitudes ensure that the pixelated beam is projected onto an area of the road large enough to perform writing functions on the road by projecting a pattern into this pixelated beam, and in particular display functions. marking on the ground, driving assistance and projection of GPS information, or adaptive lighting functions requiring pixelation of the lighting beam and in particular non-dazzling high beam or lighting functions dynamic cornering type lighting. The projection optical element can thus comprise one or a combination of several of the following optical components: lens, reflector, guide, collimator, prism.
    Where appropriate, the pixelated light source may comprise at least 20 columns and at least 20 rows of elementary emitters, in particular at least 32 rows and columns of elementary emitters. These numbers of columns and minimum rows of elementary emitters, in combination with the above-mentioned vertical and horizontal amplitudes, make it possible to obtain, for each of the elementary light beams, once projected by the optical projection element, a lower angular opening. at 0.5 °, or even less than 0.3 °. In this way, a minimum resolution of the pixelated beam is obtained when it is projected onto the road such that a satisfactory perception of said pattern projected in the pixelated beam is guaranteed by a road user and / or by the driver of the vehicle as well. team.
    Advantageously, the elementary emitters and the optical projection element are arranged so that two neighboring pixels, that is to say two adjacent pixels on the same row or on the same column, are contiguous, that is to say that is, their adjacent edges are merged.
    In one embodiment of the invention, the pixelated light source of the first module comprises at least one matrix of electroluminescent elements (called in English monolithic array) arranged in at least two columns by at least two lines. Preferably, the light-emitting source comprises at least one matrix of monolithic electroluminescent element matrix, also called monolithic matrix.
    In a monolithic matrix, the electroluminescent elements are grown from a common substrate and are electrically connected so as to be selectively activatable, individually or by subset of electroluminescent elements. Thus each electroluminescent element or group of electroluminescent elements can form one of the elementary emitters of said pixelated light source which can emit light when its or their material is supplied with electricity
    Different arrangements of electroluminescent elements can meet this definition of monolithic matrix, since the electroluminescent elements have one of their main dimensions of elongation substantially perpendicular to a common substrate and that the spacing between the elementary emitters, formed by one or more electroluminescent elements grouped together electrically, is low in comparison with the spacings imposed in known arrangements of flat square chips soldered on a printed circuit board.
    The substrate can be predominantly made of semiconductor material. The substrate may include one or more other materials, for example non-semiconductors. These electroluminescent elements, of submillimetric dimensions, are for example arranged projecting from the substrate so as to form rods of hexagonal section. The light-emitting sticks are born on a first face of a substrate. Each electroluminescent rod, here formed by the use of gallium nitride (GaN), extends perpendicularly, or substantially perpendicularly, projecting from the substrate, here made from silicon, other materials such as silicon carbide which can be used without get out of the context of the invention. For example, the light-emitting sticks could be made from an alloy of aluminum nitride and gallium nitride (AIGaN), or from an alloy of aluminum phosphides, indium and gallium (AlInGaP). Each electroluminescent rod extends along an elongation axis defining its height, the base of each rod being arranged in a plane of the upper face of the substrate.
    The light-emitting sticks of the same monolithic matrix advantageously have the same shape and the same dimensions. They are each delimited by a terminal face and by a circumferential wall which extends along the axis of extension of the rod. When the light-emitting rods are doped and are the subject of a polarization, the resulting light at the output of the semiconductor source is emitted essentially from the circumferential wall, it being understood that light rays can also emerge from the face terminal. As a result, each light-emitting stick acts as a single light-emitting diode and the luminance of this source is improved on the one hand by the density of the light-emitting sticks present and on the other hand by the size of the illuminating surface defined by the circumferential wall. and which therefore extends over the entire periphery, and the entire height, of the stick. The height of a stick can be between 2 and 10 μm, preferably 8 μm; the largest dimension of the end face of a rod is less than 2 μm, preferably less than or equal to 1 μm.
    It is understood that, during the formation of the light-emitting rods, the height can be modified from one zone of the pixelated light source to another, so as to increase the luminance of the corresponding zone when the average height of the rods constituting it is increased. Thus, a group of light-emitting sticks can have a height, or heights, different from another group of light-emitting sticks, these two groups being constitutive of the same semiconductor light source comprising light-emitting sticks of submillimetric dimensions. The shape of the light-emitting rods can also vary from one monolithic matrix to another, in particular on the section of the rods and on the shape of the end face. The rods have a generally cylindrical shape, and they can in particular have a shape of polygonal section, and more particularly hexagonal. We understand that it is important that light can be emitted through the circumferential wall, whether it has a polygonal or circular shape.
    Furthermore, the end face may have a substantially planar shape and perpendicular to the circumferential wall, so that it extends substantially parallel to the upper face of the substrate, or it may have a domed or pointed shape at its center. , so as to multiply the directions of emission of the light leaving this end face.
    The light-emitting sticks are arranged in a two-dimensional matrix. This arrangement could be such that the sticks are staggered. Generally, the rods are arranged at regular intervals on the substrate and the separation distance of two immediately adjacent light-emitting rods, in each of the dimensions of the matrix, must be at least equal to 2 μm, preferably between 3 μm and 10 pm, so that the light emitted by the circumferential wall of each rod can exit the matrix of light-emitting rods. Furthermore, it is expected that these separation distances, measured between two axes of extension of adjacent rods, will not be greater than 100 μm.
    According to another embodiment, the monolithic matrix may comprise electroluminescent elements formed by layers of epitaxial electroluminescent elements, in particular a first layer of GaN doped n and a second layer of GaN doped p, on a single substrate, for example in silicon carbide, and which is cut (by grinding and / or ablation) to form a plurality of elementary emitters respectively from the same substrate. The result of such a design is a plurality of light-emitting blocks all from a single substrate and electrically connected to be selectively activatable from each other.
    In an exemplary embodiment according to this other embodiment, the substrate of the monolithic matrix may have a thickness of between 100 μm and 800 μm, in particular equal to 200 μm; each block may have a width and width, each being between 50 pm and 500 pm, preferably between 100 pm and 200 pm. In a variant, the length and the width are equal. The height of each block is less than 500 μm, preferably less than 300 μm. Finally, the exit surface of each block can be made via the substrate on the side opposite the epitaxy. The separation distance between two elementary transmitters. The distance between each contiguous elementary transmitter can be less than 1 μm, in particular less than 500 μm, and it is preferably less than 200 μm.
    According to another embodiment not shown, both with light-emitting sticks extending respectively projecting from the same substrate, as described above, with with light-emitting blocks obtained by cutting out light-emitting layers superimposed on the same substrate, the monolithic matrix may further comprise a layer of a polymeric material in which the electroluminescent elements are at least partially embedded. The layer can thus extend over the entire extent of the substrate or only around a determined group of electroluminescent elements. The polymer material, which can in particular be based on silicone, creates a protective layer which makes it possible to protect the electroluminescent elements without hampering the diffusion of the light rays. In addition, it is possible to integrate in this layer of polymeric material wavelength conversion means, and for example phosphors, capable of absorbing at least part of the rays emitted by one of the elements and of converting at least part of said excitation light absorbed into emission light having a wavelength different from that of the excitation light. It is equally possible to provide that the phosphors are embedded in the mass of the polymer material, or that they are arranged on the surface of the layer of this polymer material.
    The pixelated light source may further include a coating of reflective material to deflect the light rays towards the exit surfaces of the light source.
    The electroluminescent elements of submillimetric dimensions define in a plane, substantially parallel to the substrate, a determined outlet surface. It is understood that the shape of this outlet surface is defined as a function of the number and the arrangement of the electroluminescent elements which compose it. It is thus possible to define a substantially rectangular shape of the transmission surface, it being understood that it can vary and take any form without departing from the context of the invention.
    The monolithic matrix or matrices capable of emitting light rays can be coupled to the control unit. The control unit can be mounted on one or more of the matrices, the whole thus forming a light sub-module. In this case, the control unit may include a central processing unit coupled with a memory on which is stored a computer program which includes instructions allowing the processor to perform steps generating signals allowing the control of the light source. . The control unit can be an integrated circuit, for example an ASIC (acronym for "Application-Specific Integrated Circuit") or an ASSP (acronym for English "Application Specifies Standard Product").
    As a variant, the pixelated light source can be formed by the assembly of at least one light source formed by at least one light emitting diode emitting light and a matrix of optoelectronic elements, and for example a matrix of micro-mirrors (also known by the acronym DMD, for the English Digital Micromirror Device) which directs the light rays coming from said at least one light source by reflection towards the optical projection element. Where appropriate, an optical collection element makes it possible to collect the rays of the at least one light source in order to concentrate them and direct them towards the surface of the matrix of micro-mirrors. Each micro mirror can pivot between two fixed positions, a first position in which the light rays are reflected towards the optical projection element, and a second position in which the light rays are reflected in a different direction from the optical projection element. . The two fixed positions are oriented in the same way for all the micro-mirrors and form with respect to a support reference plane of the matrix of micro-mirrors an angle characteristic of the matrix of micro-mirrors, defined in its specifications. This angle is generally less than 20 ° and is usually around 12 °. Thus, each micro-mirror reflecting a small part of the light rays incident on the micro-mirror matrix forms an elementary emitter of the pixelated light source, actuation and control of the change of position makes it possible to selectively activate this elementary emitter for whether or not to emit an elementary light beam
    In another variant, the pixelated light source can be formed by a laser scanning system in which a laser source emits a laser beam towards scanning means configured to scan with the laser beam the surface of a wavelength converter element. , surface which is imaged by the optical projection element. The scanning of the beam is carried out by the scanning means at a sufficiently high speed so that the human eye does not perceive its movement in the projected image. Synchronized control of the ignition of the laser source and of the beam scanning movement makes it possible to generate a matrix of elementary transmitters which can be selectively activated at the surface of the wavelength converter element. Here, the scanning means are a mobile micro-mirror, making it possible to scan the surface of the wavelength converter element by reflection of the laser beam. The micro-mirrors mentioned as a scanning means are for example of the MEMS type (for “Micro-Electro-Mechanical Systems” in English or electromechanical microsystem). However, the invention is in no way limited to this scanning means and can use other kinds of scanning means, such as a series of mirrors arranged on a rotating element, the rotation of the element causing a scanning of the surface. transmission by the laser beam
    Where appropriate, the second light module can be arranged so that the second beam of pixelated crossing type has between 5 and 400 pixels, in particular 9 pixels. For example, the second pixelized crossing beam type may have a single line of pixels, or alternatively, several lines of pixels arranged one above the other.
    Advantageously, the second module can be arranged so that each pixel of the second beam of pixelated crossing type has a width and / or a length strictly greater than 0.5 °, and in particular greater than 1 °.
    Advantageously also, the second light module can be arranged so that the second beam of pixelated crossing type has a vertical amplitude of at least 5 ° and a horizontal amplitude of at least 15 °.
    A beam of the crossing type is understood to be a light beam intended to illuminate the road without dazzling other road users. To this end, the second light module is arranged so that the second beam of pixelated crossover type has an upper cutoff of crossover type, this upper cutoff being defined by the upper edges of the pixels making up the last upper line of this second light beam.
    The upper crossing of the crossover type may for example have a horizontal portion and an oblique portion. We can for example refer to ECE regulation n ° 123 in which a regulatory cut-off is defined having a horizontal portion placed at 0.57 ° below the horizon and an oblique portion inclined at 15 ° with respect to the horizontal portion.
    As a variant, the upper crossing of the crossover type may comprise a single flat horizontal portion.
    In one embodiment of the invention, the first and second light modules are arranged so that the first and second beams overlap so that the first pixelated beam extends in the overall beam exclusively below the cut-off upper of the second pixelized crossover beam.
    Where appropriate, the overall beam has an upper horizontal cut formed only by the upper horizontal cut of the second beam of pixelated crossover type. In this case, the first pixelized beam is thus completely included in the second beam of pixelated crossover type, the vertical overlap is then total. We thus benefit from a projection area entirely dedicated to a writing function on the road and we guarantee that in the event of a problem at the level of the first module, the whole of the low beam lighting function is preserved.
    In another embodiment of the invention, the first and second light modules are arranged so that the first and second beams overlap so that the first pixelated beam extends in the overall beam above and below of the upper cutoff of the second pixelized crossover beam. Where appropriate, the portion of the first pixelized beam extending above the second beam of the pixelized crossing type can produce a portion, for example oblique, of a crossing of the crossover type intended to be associated with the upper cut of the second beam. . In this case, this portion can for example be moved when the vehicle approaches a turn to improve the performance of the dynamic cornering light function. On the other hand, this portion of the first pixelized beam extending above the second beam of pixelated crossing type can perform a selective route type lighting function.
    Advantageously, the second light module is arranged so that the second pixelized type cross beam extends horizontally in a substantially symmetrical manner on either side of a vertical axis and the first light module is arranged so that the first pixelized beam s extends horizontally substantially asymmetrically on either side of this vertical axis. This vertical axis can for example be a vertical axis intercepting the optical axis of said light device. In the case of a second pixelized crossover type beam comprising a horizontal cutout portion and an oblique cutout portion, the vertical axis can in particular pass through the junction of these two horizontal and oblique portions.
    Preferably, the first pixelated beam can extend horizontally mainly on the exterior-vehicle side, when the light device is mounted on the vehicle. This guarantees that the projection area for the writing function on the ground is sufficiently large so that the pattern can be moved regardless of the curvature of the turn approached by the vehicle.
    Advantageously, the first and second light modules are arranged so that at least one edge of each pixel of the first pixelized beam coincides with an edge of one pixel of the second beam of pixelized crossing type.
    The coincidence of pixel edges is understood to mean a superposition of these edges when the pixels are projected onto the road or onto a screen, for example arranged 25 meters from the light device. Preferably, the first and second light modules are arranged so that at least one vertical edge of each pixel of the second beam of pixelated crossover type coincides with a vertical edge of one pixel of the first beam of pixelated crossover type. If necessary, the width of the pixels of the second beam is proportional to the width of the pixels of the first beam. It is thus possible to obtain an overlap of the first and second beams with interlacing of the pixels, so that the overall beam has satisfactory homogeneity, that is to say without inhomogeneity between two pixels of the overall beam.
    Advantageously, the control unit is arranged to selectively control, as a function of control instructions that it receives, the light intensity of said plurality of pixels of the first and second beams so that the pattern is projected into the global beam by a difference in intensity between these pixels of the first and second light beams.
    Control of the light intensity of a pixel means the switching on or off of this pixel as well as the under-intensification or over-intensification of the light intensity of this pixel.
    Advantageously, the pattern intended to be projected is defined by a matrix of points and the control unit is arranged to selectively control the light intensity of a plurality of pixels of the first and second beams located in a projection area located at the level overlapping the first and second beams so as to generate a contrast between each pair of pixels of this plurality of overlapping pixels, each contrast corresponding to a point in said matrix of points.
    In other words, the overlap of the first and second pixelated beams defines a matrix projection area which is controllable to display a pattern there.
    If necessary, the pattern can be generated by positive contrasts, that is to say by differences in positive intensities in each pair of pixels between the pixel of the first beam and the pixel of the second beam, for example by on intensification of the pixel of the first beam and / or by under-intensification of the pixel of the second beam.
    As a variant, the pattern can be generated by negative contrasts, that is to say by differences in negative intensities in each pair of pixels between the pixel of the first beam and the pixel of the second beam, for example by sub- intensification of the pixel of the first beam and / or by over-intensification of the pixel of the second beam.
    If desired, the control unit is arranged to decrease the light intensity of all the pixels of the second pixel-like cross beam at the level of said projection area. If applicable, the light intensity of the rest of the pixels of the second pixelated crossover type beam, outside the projection area, remains unchanged. This improves the contrast and therefore the perceptibility of the pattern compared to the rest of the second pixelized type cross beam.
    According to one embodiment of the invention, the control unit is arranged so as to control the pixels of the first beam and / or of the second beam when the motor vehicle approaches a turn so as to modify the light intensity of the overall beam towards the turn. If necessary, the control unit is arranged so as to control the pixels of the first beam and / or of the second beam when the motor vehicle approaches a turn:
    to increase the horizontal amplitude of the global beam in the direction of the turn, the pixels of the global beam being for example lit or gradually intensified in the direction of the turn, and / or to shift the maximum intensity of the global beam in the direction of the turn and / or to move a portion of an upper cut, in particular of an oblique portion of an upper cut, of the overall beam in the direction of the turn.
    Advantageously, the control unit is arranged to selectively control the light intensity of said plurality of pixels of the first and second beams located in the projection area so as to shift each contrast between a pair of pixels of this plurality of pixels which are overlap towards another pair of pixels of this plurality of pixels which overlap in the direction of the turn. By displacement of a contrast from a first pair of pixels to a second pair of pixels is meant the control of this second pair of pixels so that the contrast of this second pair is substantially identical to that of the first pair. In this way, it guarantees the conservation of the contrast during the displacement of the pattern, so as not to disturb the driver.
    Advantageously, the light device comprises a third light module capable of projecting a third beam of pixelated road type, the first and third light modules being arranged so that the first and third beams overlap at least partially vertically.
    The invention also relates to a light system for a motor vehicle, the system comprising a light device according to one of the preceding claims and a device for detecting a turn intended to be approached by the motor vehicle, the unit for control of the light device being arranged to receive information from said turn detection device and to control the pixels of the beams projected by the light modules of the light device as a function of said information. The detection device can in particular be a camera filming the road associated with image processing software, or even a steering wheel angle sensor.
    Advantageously, the system includes a device for detecting vehicle traffic conditions and / or for receiving information relating to vehicle traffic conditions, and in that the control unit is arranged to receive information relating to these conditions for circulation of said detection and / or reception device and for selectively controlling said plurality of pixels of the first and second beams so as to project a pattern in the overall beam relating to said circulation conditions.
    For example, the detection and / or reception device can be a camera, a lidar, a GPS, or a wireless receiver. If necessary, the information on traffic conditions detected or received may be the presence or absence of a marking on the ground, an optimal trajectory of the vehicle to be used, GPS navigation information, the presence of a traffic sign , the presence of an obstacle or danger, or the state of the traffic.
    Other characteristics and advantages of the present invention will be better understood with the aid of the description of the examples and of the drawings among which:
    Figures 1A and 1B show front and top views of a light device according to a preferred embodiment of the invention;
    Figure 1C shows the light beams projected by the light device of Figures 1A and 1B;
    FIG. 2A shows the light beams projected by the light device of FIGS. 1A and 1B on the road when the vehicle is traveling on a straight road and FIG. 2B shows the light beams projected by the light device of FIGS. 1A and 1B on the road when the vehicle is entering a turn.
    Unless specifically indicated to the contrary, technical characteristics described in detail for a given embodiment may be combined with the technical characteristics described in the context of other embodiments described by way of examples and without limitation.
    FIGS. 1A and 1B show a light device 1 according to an embodiment of the invention. This light device comprises a first light module 2 capable of projecting a first pixelated beam HR and a second light module 3 capable of projecting a second beam of pixelated crossover type LB. The first and second pixelized beams HR and LB have been represented in FIG. 1C, in projection on a screen placed 25 meters from the light device 1 and on which have been materialized a horizontal axis HH representing the horizon and a vertical axis VV, perpendicular to the horizontal axis HH and crossing the optical axis X of the light device 1.
    The first module 2 includes:
    a pixelated light source 21 comprising 900 elementary emitters arranged in a matrix of 20 lines by 45 columns, each of the elementary emitters being selectively activatable to emit an elementary light beam; and a projection optical element 22 associated with said light source for projecting each of said elementary light beams in the form of a pixel having a width and a length of 0.3 °.
    All the pixels projected by the first module 2 form said first pixelized beam HR. This HR beam has a horizontal amplitude of 12 ° and a vertical amplitude of 9 °. It extends asymmetrically on either side of the vertical V-V axis. In this case, the light device 1 being a right headlight of the vehicle, the HR beam extends over 4 ° on the interior-vehicle side and 8 ° on the exterior-vehicle side. It also extends 4 ° above the horizontal H-H axis and 5 ° below the horizontal H-H axis.
    In the mode described, the light source 21 comprises a matrix of monolithic electroluminescent elements, as described above.
    Provision may be made to replace the light source 21 by any other type of pixelated light source described above, such as for example a matrix of light-emitting diodes or a light source associated with a matrix of optoelectronic elements such as micro-mirrors .
    The first light module may include other elements than those previously described. These elements will not be described in the context of the present invention since they do not interact in a functional manner with the arrangements according to the invention.
    The second module 3 includes:
    a matrix 31 of elementary emitters comprising 9 selectively activatable light-emitting diodes and arranged along a line, each diode being able to emit an elementary light beam;
    a plurality 32 of primary optical elements arranged in front of the matrix 31 for collecting, shaping and guiding the elementary light beams originating from each of the light-emitting diodes; and a projection optical element 33 disposed in front of the primary optical elements to project each of said elementary light beams originating from the primary optical elements in the form of a pixel having a width of 3 ° and a length of 5 °
    Reference may in particular be made to document FR3056692 which describes the principle of function of such a module.
    The set of pixels projected by the second module 3 forms said second pixelated beam LB. This beam LB has a horizontal amplitude of 20 ° and a vertical amplitude of 8 °.
    The second light module 3 is arranged so that the second beam of pixelated crossover type has an upper cutoff of crossover type LB_CO. In the present case, the primary optical elements 32 are arranged so that their exit surfaces are abutted so that the lower edges of these surfaces are joined and aligned and the projection optical element 33 is focused on these exit surfaces . In this way, the optical projection element 33 comes to image these lower edges in an upper cut LB_CO, defined by the upper edges of the pixels making up this second light beam.
    In the example described, the upper cut has a single flat horizontal portion, arranged at 0.57 ° below the horizontal axis H-H.
    The second pixelized beam thus forms a beam of pixelated crossing type.
    We thus observe in FIG. 1C that:
    the first pixelized beam HR has a number of pixels greater than the number of pixels of the second pixelized type cross beam LB; each pixel of the first pixelized beam HR has a width and a length respectively less than the width and length of the pixels of the second beam of pixelized crossover type LB; and the first pixelized beam HR has a horizontal amplitude lower than the horizontal amplitude of the second beam of pixelated crossing type LB.
    It therefore follows that the resolution of the first pixelized beam HR is greater than the resolution of the second beam of pixelized crossing type LB.
    According to the invention, the first and second light modules 2 and 3 are arranged so that the first and second beams HR and LB partially overlap vertically to form an overall beam LBG.
    The first pixelized beam HR thus extends above and below the upper cut-off LB_CO of the second beam of pixelated crossover type LB.
    The overlap is such that each vertical edge of each pixel of the second pixelized crossover beam LB coincides with a vertical edge of one pixel of the first pixelated beam HR.
    Finally, the light device 1 comprises a control unit 4 capable of selectively controlling each the light intensity of each of the pixels of the first and second beams HR and LB as a function of control instructions which it receives, for example by switching on, by selectively switching off the elementary emitters of the light sources 21 and 31 or alternatively increasing or decreasing the electric power supplied to each of these elementary emitters.
    The overlap of the first and second pixelized beams defines a matrix projection zone ZP formed by the overlapping of a plurality of pixels of the first and second pixelated beams HR and LB. Each pixel of the projection area ZP is thus formed by a pair of a pixel of the first beam HR and a pixel of the second beam LB which overlap each other. This pixel of the projection area ZP is therefore controllable by the control unit 4, by jointly controlling the light intensities of each pixel of the pair of pixels.
    FIG. 2A shows a first mode of operation of the light device 1 in FIGS. 1A to 1C. In this mode, the vehicle equipped with the light device 1 is traveling on a straight line. This vehicle is equipped with a device for detecting a turn intended to be approached by the motor vehicle and with a device for detecting and receiving information relating to the traffic conditions of the vehicle.
    The corner detection device detects that the vehicle is traveling in a straight line, and the information detection device relating to the traffic conditions of the vehicle receives GPS information to be transmitted to the driver via the light device 1.
    On the one hand, the control unit 4 controls a plurality of pixels of the second beam of the pixelated crossover type LB to illuminate the entire road, the rest of the pixels of this second beam LB therefore remaining off.
    On the other hand, the control unit 4 controls a first plurality of pixels LBK of the first pixelized beam HR extending above the cut LB_CO to complete the second beam LB and to form an oblique cut portion LBK_CO which is associated at the LB_CO cutoff to form together a cutoff profile of the regulatory crossover type.
    Finally, the control unit 4 controls a second plurality of pixels H RM of the first pixelized beam HR in the projection area ZP so as to create local light over-intensifications in the pixels of the second beam LB with which this second plurality of pixels H RM overlap, the rest of the pixels of the first pixelated beam remaining off. These over-intensifications thus create positive contrasts which consequently form a pattern in the projection area, which indicates to the driver the direction to follow.
    In order to enhance the contrast and make the pattern even more noticeable, the control unit 4 decreases the light intensity of the pixels of the second beam LB with which the second plurality of pixels H RM overlap.
    The control unit 4 thus performs a writing function on the road.
    FIG. 2B shows a second operating mode of the light device 1 of FIGS. 1A to 1C, succeeding the operating mode of FIG. 2A. In this mode, the vehicle equipped with the lighting device 1 approaches a turn. The cornering detection device detects that the vehicle is entering a corner.
    On the one hand, the control unit 4 performs a dynamic lighting function of the turn by: turning on pixels of the second beam of pixelated crossover type LB in the direction of the turn, by moving the oblique cut-off portion LBK_CO of the first beam Pixelated HR in the direction of the turn, gradually turning off the first plurality of pixels LBK in FIG. 2A and turning on another plurality of pixels LBK of the first pixelated beam HR on the side of the turn.
    In order to preserve the contrasts between the pixels of the first and second beams HR and LB at the level of the projection area ZP which allow the driver to perceive the pattern, the control unit 4 then also moves the pattern in the direction of the turn by turning off progressively the second plurality of HRM pixels of FIG. 2A and by lighting up another plurality of HRM pixels of the first pixelated beam HR on the side of the turn. As previously, the control unit 4 decreases the light intensity of the pixels of the second beam LB with which the second plurality of pixels HRM overlap.
    This guarantees the preservation of the contrast by moving the pattern at the same time as moving certain parts of the pixel-like crossover beam, so as not to disturb the driver. The pattern also remains perceptible to the driver, keeping its position in the projection area from the driver's point of view.
    The foregoing description clearly explains how the invention makes it possible to achieve the objectives which it has set itself and in particular to propose a solution making it possible to project a pattern in a beam of the crossing type, this pattern remaining perceptible without abrupt modification during the implementation of a dynamic cornering lighting function. The light device according to the invention makes it possible to preserve the contrast characteristics making it possible to perceive the pattern, when the dynamic cornering lighting function is implemented.
    The invention cannot be limited to the embodiments specifically given in this document by way of nonlimiting examples, and extends in particular to all equivalent means and to any technically operative combination of these means. Thus, the characteristics, the variants and the various embodiments of the invention can be associated with one another, according to various combinations, insofar as they are not incompatible or mutually exclusive of each other. One can in particular imagine variants of the invention comprising only a selection of the characteristics described, since, in accordance with the invention, the control unit controls at least one pixel of each of the first and second beams when the vehicle automobile approaches a bend so as to create a displacement of said pattern in the overall beam.
    权利要求:
    Claims (13)
    [1" id="c-fr-0001]
    claims
    1. Light device (1) for a motor vehicle comprising a first light module (2) capable of projecting a first pixelated beam (HR) according to a first resolution and a second light module (3) capable of projecting a second beam of the crossing type pixelated (LB) according to a second resolution lower than the first resolution, the first and second light modules being arranged so that the first and second beams overlap at least partially vertically to form a global beam (LBG), the device comprising a control unit (4) capable of selectively controlling a plurality of pixels (HRM) of the first and second beams so as to project a pattern into the overall beam, characterized in that the control unit is arranged so as to control at at least one pixel from each of the first and second beams when the motor vehicle approaches a turn so as to create a displacement ement of said pattern in the overall beam.
    [2" id="c-fr-0002]
    2. Light device (1) according to the preceding claim, in which the first and second light modules (2,3) are arranged so that:
    the first pixelized beam (HR) has a number of pixels greater than the pixel number of the second beam of pixelated crossing type (LB); and / or each pixel of the first pixelized beam has a width and / or a length that is strictly less than the minimum width and / or the minimum length of the pixels of the second pixelated crossover type beam respectively;
    the first pixelized beam has a horizontal amplitude less than the horizontal amplitude of the second pixelized crossover type beam.
    [3" id="c-fr-0003]
    3. Light device (1) according to the preceding claim, wherein the first and second light modules (2,3) are arranged so that the first and second beams (HR, LB) overlap so that the first beam pixelated extends in the global beam (LBG) exclusively below the upper cut (LB_CO) of the second beam of pixelated crossover type.
    [4" id="c-fr-0004]
    4. light device (1) according to one of claims 1 to 2, wherein the first and second light modules (2,3) are arranged so that the first and second beams (HR, LB) overlap so that that the first pixelized beam extends in the global beam (LBG) above and below the upper cut (LB_CO) of the second beam of pixelated crossover type.
    [5" id="c-fr-0005]
    5. Luminous device (1) according to one of the preceding claims, in which the second luminous module (3) is arranged so that the second beam of pixelated crossing type (LB) extends horizontally in a substantially symmetrical fashion on both sides. 'other of a vertical axis (VV) and the first light module (2) is arranged so that the first pixelated beam (HR) extends horizontally in a substantially asymmetrical manner on either side of this vertical axis.
    [6" id="c-fr-0006]
    6. Light device (1) according to one of the preceding claims, in which the control unit (4) is arranged to selectively control the light intensity of said plurality (HRM) of pixels of the first and second beams so as to that the pattern is projected into the global beam (LBG) by a difference in intensity between these pixels of the first and second light beams (HR.LB).
    [7" id="c-fr-0007]
    7. Light device (1) according to the preceding claim, in which the pattern is defined by a matrix of points and the control unit (4) is arranged to selectively control the light intensity of a plurality (HRM) of pixels. first and second beams (HR, LB) located in a projection area (ZP) located at the overlap of the first and second beams so as to generate a contrast between each pair of pixels of this plurality of overlapping pixels, each contrast corresponding to a point in said matrix of points.
    [8" id="c-fr-0008]
    8. Light device (1) according to the preceding claim, in which the control unit (4) is arranged to reduce the light intensity of all the pixels of the second beam of pixelated type crossover (LB) at said area of projection (ZP).
    [9" id="c-fr-0009]
    9. Light device (1) according to one of claims 7 to 8, wherein the control unit (4) is arranged so as to control the pixels of the first beam (HR) and / or the second beam (LB) when the motor vehicle approaches a turn so as to modify the light intensity of the overall beam (LBG) in the direction of the turn.
    [10" id="c-fr-0010]
    10. Light device (1) according to claim 9, wherein the control unit (4) is arranged to selectively control the light intensity of said plurality of pixels (HRM) of the first and second beams (HR, LB) located in the projection area (ZP) so as to shift each contrast between a pair of pixels of this plurality of overlapping pixels towards another pair of pixels of this plurality of overlapping pixels in the direction of the turn.
    [11" id="c-fr-0011]
    11. Light device (1) according to one of the preceding claims, in which the first light module (2) comprises a matrix of monolithic electroluminescent elements (21).
    [12" id="c-fr-0012]
    12. Light system for a motor vehicle, the system comprising a light device (1) according to one of the preceding claims and a device for detecting a turn intended to be approached by the motor vehicle, the control unit (4 ) of the light device being arranged to receive information from said turn detection device and to control the pixels of the beams (HR, LB) projected by the light modules (2, 3) of the light device as a function of said information.
    [13" id="c-fr-0013]
    13. Lighting system according to the preceding claim, characterized in that it comprises a device for detecting vehicle traffic conditions and / or for receiving information relating to vehicle traffic conditions, and in that the unit for control (4) is arranged to receive information relating to these circulation conditions from said detection and / or reception device and to selectively control said plurality of pixels (HRM) of the first and second beams (HR, LB) so as to project a pattern in the overall beam (LBG) relating to said traffic conditions.
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    同族专利:
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    JP2019204772A|2019-11-28|
    US10632896B2|2020-04-28|
    US20190299843A1|2019-10-03|
    US20200215960A1|2020-07-09|
    CN110345441A|2019-10-18|
    EP3550204A1|2019-10-09|
    FR3079468B1|2020-03-20|
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    法律状态:
    2019-04-29| PLFP| Fee payment|Year of fee payment: 2 |
    2019-10-04| PLSC| Publication of the preliminary search report|Effective date: 20191004 |
    2020-04-30| PLFP| Fee payment|Year of fee payment: 3 |
    2021-04-29| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1852898A|FR3079468B1|2018-04-03|2018-04-03|LIGHT DEVICE FOR A MOTOR VEHICLE CARRYING OUT A WRITING FUNCTION ON THE GROUND|
    FR1852898|2018-04-03|FR1852898A| FR3079468B1|2018-04-03|2018-04-03|LIGHT DEVICE FOR A MOTOR VEHICLE CARRYING OUT A WRITING FUNCTION ON THE GROUND|
    JP2019070697A| JP2019204772A|2018-04-03|2019-04-02|Motor vehicle lighting device with function of writing on ground|
    US16/374,207| US10632896B2|2018-04-03|2019-04-03|Motor vehicle lighting device implementing a function for writing on the ground|
    CN201910268324.6A| CN110345441A|2018-04-03|2019-04-03|Realize the vehicle light for the function of writing on the ground|
    EP19167065.2A| EP3550204A1|2018-04-03|2019-04-03|Light device for a motor vehicle with road writing function|
    US16/821,695| US20200215960A1|2018-04-03|2020-03-17|Motor vehicle lighting device implementing a function for writing on the ground|
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