Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
  • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
  • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
  • F21S41/141—Light emitting diodes [LED]
  • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
  • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
  • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
  • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
  • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
  • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
  • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
  • F21S41/141—Light emitting diodes [LED]
  • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
  • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
  • F21S41/25—Projection lenses
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
  • F21S45/40—Cooling of lighting devices
  • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
  • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
  • F21W2102/10—Arrangement or contour of the emitted light
  • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region

Definitions

• the invention relates to a light device of a motor vehicle, in particular lighting and / or signaling, of the projector or fire type, having at least one pixelated light source, in order to project a pixelated light beam.
• ADB adaptive lighting
• DBL turn-light function
• the invention therefore aims to provide a motor vehicle light device producing a pixelated road beam having a large horizontal extent and high resolution, while having a satisfactory maximum intensity, while being more economical than known solutions.
• the invention firstly relates to a light device of a motor vehicle comprising:
• a first module comprising at least a first pixellated electroluminescent light source, the first module being capable of producing a first pixelized partial-road beam having a first resolution and a first horizontal angular amplitude;
• a second module comprising a second pixilated electroluminescent light source, the second module being capable of producing a second pixelized partial road-type beam having a smaller angular amplitude than that of the first pixelized partial road-type beam and a resolution greater than that of the first beam of partial road pixelated type.
• a pixelated route beam is advantageously obtained over a satisfactory range while preserving a high resolution in a part of the beam, in particular a central beam, the one which is at the intersection of the horizontal and vertical axes, corresponding to the maximum intensity of a road beam as defined by the regulations, in particular R1 12 ECE, all versions since 1995.
• this solution is particularly economical compared to DMD or LCD components.
• the resolution of the first and second pixelated beams can be estimated by the number and size of the pixels composing these beams relative to the amplitudes of these beams.
• the first light module and the second light module are arranged so that, respectively, the first beam of road type partial pixelized and the second beam of partial pixelated road type each have at least 400 pixels.
• the first light module can be arranged so that the first pixilated partial route beam has at least 400 pixels, or even at least 1000 pixels, or even at least 2000 pixels.
• This first pixelized beam may for example comprise 20 columns and 20 rows of pixels, in particular 32 columns and 32 lines of pixels.
• the first pixilated partial route beam has more columns than rows and therefore extends more in width than height when it is projected on a measurement screen at 25m from the light device.
• the first module may be arranged so that each pixel of the first pixelated beam has a width and / or height less than or equal to 1 "in particular less than or equal to 0.5 °.
• the first light module can be arranged so that the first light module is arranged so that the first pixilated partial road-type beam has a vertical amplitude at least equal to 4 °, preferably up to 9 ° and a horizontal amplitude. at least 25 °, preferably up to 50 °.
• the second module is arranged so that each pixel of the second pixilated partial-road-type beam has a width and / or a height less than or equal to 0.5 °, preferably less than or equal to 0.3 °.
• the second light module is arranged so that the second pixilated partial road-type beam has a vertical amplitude at least equal to 2 °, of at most equal to 6 ° and a horizontal amplitude of at least 8 °, at most equal to 20 °, preferably 12 °.
• the first module and the second module may for example comprise each:
• 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;
• the projection optical system is arranged so that the pixelated beam has a vertical amplitude of at least 2 ° and a horizontal amplitude of at least 8 °. These horizontal and vertical amplitudes make it possible to ensure that the pixelated beam is projected onto a sufficiently large area of the road to perform road writing functions by projecting a pattern in this pixelated beam, and in particular display functions. ground marking, driving assistance and GPS information projection, or adaptive lighting functions requiring pixelation of the light beam and in particular non-dazzling high beam lighting dynamic lighting type cornering.
• the projection optical system can thus comprise one or a combination of several of the following optical components: lens, reflector, guide, collimator, prism.
• the pixelated light source may comprise at least 20 columns and at least 20 lines of elementary emitters, including at least 32 rows and columns of elementary emitters. These numbers of columns and minimal lines 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 projection optical system, a lower angular aperture or equal to 1 °, or even less than or equal to 0.3 °. In this way, an elevated resolution of the pixelated beam is obtained when it is projected onto the road such that a satisfactory perception of said projected pattern in the pixelated beam by a user of the road and / or by the driver of the vehicle is guaranteed. so equipped.
• the elementary emitters and the projection optical system are arranged so that two neighboring pixels, that is to say two adjacent pixels on the same line or on the same column, are contiguous, that is to say that is, their adjacent edges are merged.
• the light device is arranged so that the first pixelized partial road-type beam and the second pixilated partial road-type beam overlap at least partially.
• the light device is arranged in such a way that the first pixilated partial road-type beam and the second pixilated partial road-type beam are juxtaposed.
• the pixellated electroluminescent light source is a matrix of electroluminescent sources (called “solid-state light source”).
• the pixelated electroluminescent source comprises a plurality of light emitting elements arranged in a matrix according to at least two columns and two lines.
• Examples of electroluminescent elements include the light emitting diode (LED), the organic light-emitting diode (OLED) or the polymeric light emitting diode (PLED). acronym for "Polymer Light-Emitting Diode”), or the micro-LED.
• the pixellated electroluminescent light source of the first module and / or the second module comprises at least one matrix of electroluminescent elements (called monolithic array) arranged in at least two columns by at least two columns. two lines.
• the electroluminescent source comprises at least one monolithic matrix of electroluminescent elements, also called monolithic matrix.
• the electroluminescent elements are grown from a common substrate and are electrically connected to be selectively activatable individually or by a subset of electroluminescent elements.
• 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.
• 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 small compared to the spacings imposed in known arrangements of flat square chips soldered to a printed circuit board.
• the substrate may be predominantly of semiconductor material.
• the substrate may comprise one or more other materials, for example non-semiconductors.
• electroluminescent elements of submillimetric dimensions are for example arranged to protrude from the substrate so as to form hexagonal rods.
• the electroluminescent rods originate on a first face of a substrate.
• Each electroluminescent rod here formed using gallium nitride (GaN) extends perpendicularly, or substantially perpendicularly, projecting from the substrate, here made of silicon, other materials such as silicon carbide can be used without depart from the context of the invention.
• the electroluminescent rods 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 axis of elongation defining its height, the base of each rod being disposed in a plane of the upper face of the substrate.
• the electroluminescent rods of the same monolithic matrix advantageously have the same shape and the same dimensions. They are each delimited by an end face and a circumferential wall which extends along the axis of elongation of the stick.
• the electroluminescent rods are doped and polarized, 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.
• each electroluminescent rod acts as a single light-emitting diode and the luminance of this source is improved on the one hand by the density of the electroluminescent rods present and on the other hand by the size of the illuminating surface defined by the circumferential wall.
• the height of a stick can be between 2 and 10 pm, preferably 8 pm; the largest dimension of the end face of a rod is less than 2 ⁇ m, preferably less than or equal to 1 ⁇ m.
• one group of electroluminescent rods may have a height, or heights, different from another group of electroluminescent rods, these two groups constituting the same semiconductor light source comprising electroluminescent rods of submillimeter dimensions.
• the shape of the electroluminescent rods can also vary from one monolithic matrix to another, especially on the rods section and on the shape of the end face.
• the rods have a generally cylindrical shape, and may in particular have a polygonal sectional shape, and more particularly hexagonal. It is understood that it is important that light can be emitted through the circumferential wall, that it has a polygonal or circular shape.
• 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 coming out of this end face.
• the electroluminescent rods are arranged in two-dimensional matrix. This arrangement could be such that the rods are arranged in staggered rows.
• the rods are arranged at regular intervals on the substrate and the separation distance of two immediately adjacent electroluminescent rods, in each of the dimensions of the matrix, must be at least 2 ⁇ m, preferably between 3 ⁇ m and 10 ⁇ m. pm, so that the light emitted by the circumferential wall of each stick can exit the matrix of electroluminescent rods.
• these separation distances measured between two axes of elongation of adjacent rods, are not greater than 100 pm.
• the monolithic matrix may comprise electroluminescent elements formed by layers of epitaxial electroluminescent elements, in particular a first n-doped GaN layer and a second p-doped GaN layer, 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.
• electroluminescent elements formed by layers of epitaxial electroluminescent elements, in particular a first n-doped GaN layer and a second p-doped GaN layer, 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 substrate of the monolithic matrix may have a thickness of between 100 ⁇ m and 800 ⁇ m, in particular equal to 200 ⁇ m; 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 ⁇ m, preferably less than 300 ⁇ m.
• the exit surface of each block can be made via the substrate on the opposite side to the epitaxy.
• the separation distance between two elementary emitters The distance between each adjacent elementary emitter may be less than 1 ⁇ m, in particular less than 500 ⁇ m, and it is preferably less than 200 ⁇ m.
• the monolithic matrix may further comprise a layer of a polymeric material in which the electroluminescent elements are at least partially embedded.
• the layer may thus extend over the whole extent of the substrate or only around a given group of electroluminescent elements.
• the polymeric material which may in particular be based on silicone, creates a protective layer that protects the electroluminescent elements without impeding the scattering of light rays.
• wavelength converting means and for example phosphors, able to absorb at least a portion of the rays emitted by one of the elements and to be converted. at least a portion of said excitation light absorbed into an emission light having a wavelength different from that of the excitation light. It can be provided without distinction whether the phosphors are embedded in the mass of the polymeric material, or that they are arranged on the surface of the layer of this polymeric material.
• the pixelated light source may further include a reflective material coating to deflect the light rays to the output surfaces of the light source.
• the electroluminescent elements of submillimetric dimensions define in a plane, substantially parallel to the substrate, a determined exit surface. It is understood that the shape of this output surface is defined according to the number and arrangement of the electroluminescent elements that compose it. It is thus possible to define a substantially rectangular shape of the emission surface, it being understood that this can vary and take any shape without departing from the context of the invention.
• the monolithic matrix (s) capable of emitting light rays can be coupled to a control unit.
• the control unit can be mounted on one or more of the dies, the assembly thus forming a light sub-module.
• the control unit may comprise a central processing unit coupled with a memory on which is stored a computer program which includes instructions enabling the processor to perform steps generating signals allowing the control of the light source.
• the control unit may be an integrated circuit, for example an ASIC (acronym of the English "Application-Specific Integrated Circuit") or an ASSP (acronym for "Application Specifies Standard Product").
• the first pixellated electroluminescent light source and the second pixilated electroluminescent light source have elementary emitters which have an emitting surface of the same size, the first module further comprising a first optical projection system. and the second module comprising a second projection optical system, the magnification factor of the second projection optical system being smaller than that of the first projection optical system, so that the resolution of the second pixelized partial road beam is greater than that of the first pixilated partial route beam.
• the second pixellated electroluminescent light source has elementary emitters whose emitting surface is smaller than that of those of the first pixellated electroluminescent light source, the first module further comprising a first optical system projection device and the second module comprising a second projection optical system, the magnification factor of the second projection optical system being equal to or smaller than that of the first projection optical system, so that the resolution of the second pixelated partial route beam is superior. to that of the first pixelated partial route beam.
• the first pixellated electroluminescent light source and / or the second pixilated electroluminescent light source have a total emitting light surface which is rectangular. This advantageously avoids the use of projection optical systems that are anamorphic to change the aspect ratio of the emitting surface and to obtain a projected beam whose dimensions are suitable for automotive lighting.
• the invention also relates to the motor vehicle comprising at least one light device according to one of the preceding embodiments or variants.
• FIG. 1 shows a front view of a light device according to a preferred embodiment of the invention
• Figure 2 shows a top view of Figure 1
• FIG. 3 shows a first configuration of light beams projected by a light device according to the invention
• FIGS. 1 and 2 show a light device 1 according to one embodiment of the invention.
• This light device comprises a first light module 2 capable of projecting a first pixelated partial road beam HB1 and a second light module 3 capable of projecting a second pixelated partial road beam HB2.
• the first and second pixelated beams HB1 and HB2 have been represented in FIGS. 3 and 4, in projection on a screen placed 25 meters from the luminous device 1 and on which a horizontal axis HH representing the horizon and a vertical axis VV have been materialized. , perpendicular to the horizontal axis HH and intersecting the optical axis X of the luminous device 1.
• the first module 2 comprises:
• a pixelated electroluminescent light source 21 comprising, for example, 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;
• an optical projection system 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 height of 1 °.
• the light source 21 comprises a matrix of electroluminescent elements monolithic, as described above.
• the pixelated electroluminescent light source 21 can be replaced by any other type of pixelated electroluminescent source described above, such as, for example, a matrix of light-emitting diodes.
• This HR beam has a horizontal amplitude of 25 ° and a vertical amplitude of 9 °. It extends symmetrically on both sides of the vertical axis V-V.
• the first light module comprises at least one pixelated electroluminescent light source 21. It can comprise one, two or three pixelated light emitting light sources 21. This makes it possible to obtain a first pixelized partial route beam pixelized HB1 very horizontally extended.
• the first light module 2 may comprise other elements than those previously described. These elements will not be described in the context of the present invention since they do not interact functionally with the provisions of the invention.
• the second light module 3 is structurally similar to the first light module 2.
• the second module 3 comprises:
• a pixelated electroluminescent light source 31 comprising, for example, 900 elementary emitters arranged in a matrix of 20 lines per 45 columns, each of the elementary emitters being selectively activatable to emit an elementary light beam;
• an optical projection system 32 associated with said light source for projecting each of said elementary light beams in the form of a pixel having a width and a height of 0.3 °
• the light device comprises an additional module 4, intended to produce a complementary beam of the dipped beam type LB.
• the additional module 4 comprises:
• a matrix 41 of elementary emitters comprising 9 electroluminescent diodes selectively activatable and arranged along a line, each diode being able to emit an elementary light beam;
• an optical projection system 43 arranged in front of the primary optical elements to project each of said elementary light beams coming from the primary optical elements in the form of a pixel having a width of 3 ° and a length of 5 °
• the light device 1 comprises a control unit 5 able to selectively control the light intensity of each of the pixels of the first and second beams HB1 and HB2 as a function of the control instructions it receives, for example by switching on, by selectively switching off the elementary emitters of the light sources 21 and 31 or by varying increasingly or decreasingly the electrical power supplied to each of these elementary emitters.
• the first and second light modules 2 and 3 are arranged so that the first and second beams HB1 and HB2 overlap at least partially.
• the second beam HB2 is included in the first beam HB1.
• the first and second light modules 2 and 3 are arranged so that the first and second beams HB1 and HB2 are adjacent.
• the second beam HB2 is framed in the first beam HB1, which is broken down into several sub-areas.
• Each of these sub-areas can be generated by a dedicated pixelated electroluminescent light source 21.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Optics & Photonics (AREA)
• Mathematical Physics (AREA)
• Electroluminescent Light Sources (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)

Applications Claiming Priority (2)

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• 2018
  • 2018-04-03 FR FR1852897A patent/FR3079470A1/fr active Pending
• 2019
  • 2019-04-03 CN CN201980036812.2A patent/CN112262285B/zh active Active
  • 2019-04-03 JP JP2020554220A patent/JP7234257B2/ja active Active
  • 2019-04-03 EP EP19716133.4A patent/EP3775676A1/de active Pending
  • 2019-04-03 US US17/045,114 patent/US11242973B2/en active Active
  • 2019-04-03 WO PCT/EP2019/058429 patent/WO2019193066A1/fr unknown

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