EP3784953A1 - Optical module projecting a pixelated light beam - Google Patents
Optical module projecting a pixelated light beamInfo
- Publication number
- EP3784953A1 EP3784953A1 EP19719337.8A EP19719337A EP3784953A1 EP 3784953 A1 EP3784953 A1 EP 3784953A1 EP 19719337 A EP19719337 A EP 19719337A EP 3784953 A1 EP3784953 A1 EP 3784953A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- matrix
- emitting diodes
- resolution
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 129
- 239000011159 matrix material Substances 0.000 claims description 120
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 239000012780 transparent material Substances 0.000 claims description 3
- 150000001768 cations Chemical class 0.000 claims 1
- 210000003850 cellular structure Anatomy 0.000 claims 1
- 210000000887 face Anatomy 0.000 description 18
- 230000004044 response Effects 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- 230000005284 excitation Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910004283 SiO 4 Inorganic materials 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- 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
- F21S41/10—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]
- F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
- F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
-
- 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
- F21S41/10—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
- F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
-
- 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
- F21S41/18—Combination of light sources of different types or shapes
-
- 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
- F21S41/24—Light guides
-
- 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
- F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
-
- 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
Definitions
- Optical module projecting a pixel light beam
- the invention relates to a light module, in particular for a motor vehicle, which is intended to project a pixel light beam performing a specific function along a longitudinal optical axis, the pixel light beam comprising a first zone. high resolution and a second low resolution area.
- Light modules of this type are already known. Such light modules are able to produce a light beam of illumination, for example a high beam, divided into pixels and of which at least some pixels can be selectively extinguished. This allows for example to illuminate the road optimally while avoiding dazzling road users.
- Such light modules are known by the name of "pixel beam". For example, it is possible to divide the overall light beam into a matrix of pixels.
- the resolution of the light beam that is to say the number of pixels per unit area, remains rather coarse.
- the extinction of a pixel plunges into the shade a portion of road that is often much wider than necessary to avoid dazzling a user of the road.
- Such an optical module generally comprises a matrix of light-emitting diodes which is associated with a matrix of light guides.
- Each light guide is a solid element that guides light through total internal reflections to an exit face.
- Each light guide is associated with a light emitting diode to produce an object pixel in the output face.
- Monolithic arrays of light-emitting diodes are also known, which make it possible to produce light-emitting diode arrays of very small size and spaced at a very small distance from each other.
- Monolithic matrix is understood to mean an electroluminescent source comprising a plurality of electroluminescent elements or electroluminescent diodes that is to say using electroluminescence, optical and electrical phenomenon during which a material emits light in response to an electric current that passes through it, or a strong electric field.
- 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, also called pixels.
- the substrate may be predominantly of semiconductor material.
- the substrate may comprise one or more other materials, for example non-semiconductors.
- the configuration of such a monolithic source allowing the arrangement of activatable pixels selectively very close to each other, compared to conventional light-emitting diodes intended to be soldered to printed circuit boards.
- the monolithic matrix comprises electroluminescent elements of which a principal dimension of elongation, namely the height, is substantially perpendicular to the common substrate, this height being at least equal to one micrometer and not more than half the meter.
- the present invention proposes a light module, in particular for a motor vehicle, which is intended to project a pixel light beam performing a determined function along a longitudinal optical axis, and illuminating a first high resolution area having more pixels per unit area than a second zone of low resolution, said zones being distinct and substantially contiguous, the light module comprising:
- At least one array of individually controlled electroluminescent diodes extending orthogonally to the optical axis
- At least one intermediate optical element forming, from the light-emitting diodes, a matrix of substantially contiguous high-resolution object pixels arranged substantially in the object focal plane of the projection optics to form, after projection, the zone of high resolution, characterized in that the light module comprises low-resolution light sources spaced from the light-emitting diode array, and primary optical elements distinct from the intermediate optical element which form low-object pixels from the low-resolution light sources. resolution arranged substantially in the object focal plane of the projection optics in substantially contiguous manner with the matrix of high resolution pixel objects to form, after projection, the low resolution zone.
- This arrangement provides a pixel light beam having a high resolution area and a low resolution area using a common projection optics for both areas.
- the resulting beam is particularly homogeneous despite the space required for the electronics associated with each light source.
- adjacent light-emitting diodes belonging to the matrix are spaced apart by a determined space, the low-resolution light source adjacent to the matrix being separated from the matrix of light-emitting diodes by a distance greater than said determined space;
- each light source is carried by a printed circuit board which is arranged parallel to the plane of the matrix of light-emitting diodes;
- each light source is carried by a printed circuit board which is arranged in a plane forming an angle with respect to the plane of the matrix of light-emitting diodes, in particular an angle of 90 °;
- the intermediate optical element associated with the matrix of light-emitting diodes is formed by a light guide with a honeycomb structure in which the light is guided by reflection on a reflective surface to an arranged output face in the object focal plane of the projection lens, the output face forming the object pixel;
- the intermediate optical element associated with the matrix of light-emitting diodes is formed by a convergent optical assembly comprising at least one lens;
- the intermediate optical element is formed by a single optical assembly having a single optical axis which is common to all the electroluminescent diodes of the matrix;
- the intermediate optical element comprises a plurality of optical assemblies which each have an optical axis associated with a light-emitting diode of the matrix;
- the object focus of the convergent lens forming an optical element associated with the matrix of light-emitting diodes is interposed axially between the matrix of light-emitting diodes and said optical element;
- the matrix of light-emitting diodes is a monolithic matrix comprising, for example, about 500 light-emitting diodes, preferably about 1,000 light-emitting diodes;
- each object pixel is enlarged relative to the associated light emitting diode of the matrix
- the matrix of light-emitting diodes is formed by the arrangement of several distinct light-emitting diodes on the same printed circuit board, for example about ten light-emitting diodes;
- each high-resolution object pixel is reduced relative to the associated light-emitting diode of the matrix
- the light guide associated with each low-resolution light source is a light guide formed of a solid part made of transparent material which guides the light by total internal reflection;
- the light guide associated with each light source of low resolution is a light guide formed by a honeycomb structure which has reflective internal surfaces which guide the light;
- each electroluminescent diode of the matrix emits white light
- each light emitting diode of the matrix emits monochromatic light which is guided by the intermediate optical element to a photoluminescent element which is arranged in the object focal plane of the projection optics to form an associated high resolution object pixel;
- the photoluminescent element is a phosphor plate
- At least one primary optical element is formed by a light guide which presents:
- an output face forming a low-resolution object pixel which is arranged substantially in the object focal plane of the projection optics and which is contiguous with the object pixels of the matrix of light-emitting diodes.
- the invention also relates to a lighting device for a motor vehicle characterized in that it comprises a light module made according to the teachings of the invention.
- FIG. 1 is a schematic side view showing a motor vehicle equipped with an optical module realized according to the teachings of the invention which emits a pixel light beam;
- FIG. 2 is a front view which represents a screen illuminated by the light beam with pixels emitted by the optical module of FIG. 1;
- FIG. 3 is a side view which represents the optical module produced according to a first embodiment of the invention.
- FIG. 4 is a side view showing the optical module made according to a second embodiment of the invention.
- FIG. 5 is a side view showing the optical module made according to a third embodiment of the invention.
- FIG. 6 is a side view showing the optical module made according to a fourth embodiment of the invention.
- FIG. 7 is a side view which shows the optical module made according to a fifth embodiment of the invention.
- FIG. 8 is a side view showing the optical module made according to a sixth embodiment of the invention.
- FIG. 9 is a side view which represents the optical module produced according to a seventh embodiment of the invention.
- FIG. 1 0 is a side view which shows the optical module made according to an eighth embodiment of the invention.
- a "projection optics" of the light emitted by the semiconductor light source is defined as follows.
- This projection optics creates a real, and possibly anamorphic, image of a part of the device, for example the source itself or a cache, or an intermediate image of the source, at a distance (finite or infinite) very large. in front of the dimensions of the device (of a ratio of the order of at least 30, preferably 100) of the device.
- This projection optics may consist of one or more reflectors, or one or more lenses, or one or more light guides or a combination of these possibilities.
- total internal reflection lightguide is defined as being an optical part capable of guiding light by total internal reflection of this light, for example an area of light. entrance to an exit zone. It can be a guide sheet.
- a "guide ply" is a guide whose thickness is small with respect to its length and its width. It can be curved and present a given curve.
- the web has two extended faces separated by a periphery, this periphery defining a thickness of the web, which may be variable, for example decreasing from one end to the other.
- These extended faces form guide faces defining a light ray propagation zone, by internal reflection on these faces.
- a “reflective surface reflection light guide” is defined as an optical part capable of guiding light by reflection of this light on the reflecting walls forming the guide, for example from an entrance area to an exit zone.
- a light converter or "phosphor” comprises at least one luminescent material designed to absorb at least a portion of at least one excitation light emitted by a light source and to convert at least one light source. at least a portion of said excitation light absorbed into an emission light having a wavelength different from that of the excitation light.
- the phosphor may, for example, contain one or more phosphor compounds of the following group: Y 3 Al 2 O 12: Ce 3+ (YAG), (Sr, Ba) 2 SiO 4 : Eu 2+ , Ca x (Si, Al) 12 (O, N) ) i 6 : Eu 2+ , CaAISi N 3 : Eu 2+ ,
- the compounds Y 3 Al 2 O 12: Ce 3+ (YAG), (Sr, Ba) 2 SiO 4 : Eu 2+ , and Cax (Si, Al) 12 (O, N) 6: Eu 2+ are configured to absorb at least partly a light of blue color and to emit yellow light in response.
- the compounds SrS: Eu 2+ , and Sr2SisN 8 : Eu 2+ are configured to absorb at least a portion of blue light and to emit red light in response.
- the compound (Y, Gd) 3 (Al, Ga) 50i 2: Ce 3+ / (Ba, Sr, Ca) SiO 4 : Eu 2+ is configured to absorb at least a portion of blue light and to emit in response white light.
- the compounds (Si, Al) e (O, N): Eu 2+ , BaMgAhoOi 7 : Eu 2+ Mn 2+ , and SrGa 2 S 4 : Eu 2+ are configured to absorb at least part of the radiation electromagnetic ultra-violet and to emit in response light of green color.
- the compounds (Sr, Ca, Ba, Mg) (P04) 6Cl2: Eu2 + , and BaMgAhoOi7: Eu2 + are configured to absorb at least a portion of ultraviolet electromagnetic radiation and to emit light in response. of blue color.
- the compounds CaAISi N3: Eu 2+, Ca2Si5l ⁇ l8: Eu 2+, and La202S: Eu 3+ are configured to absorb at least in part a ultra-violet electromagnetic radiation and for transmitting in response to the light of red color.
- FIG. 1 shows a motor vehicle 1 0 equipped with a lighting device 1 2.
- the lighting device 1 2 comprises a light module 14 which produces a pixel light beam 1 6 which carries out a light function. determined lighting. This is a high beam function.
- the pixel light beam 1 6 is emitted along a substantially longitudinal transmission axis "A" toward the front of the vehicle 1 0.
- a vertical transverse screen 18 arranged at a predetermined longitudinal distance in front of the vehicle 1 0.
- the screen 1 8 is here arranged 25 m from the vehicle.
- FIG. 2 shows the zones of the screen 1 8 which are illuminated by the pixel light beam 1 6.
- a transverse axis "H” and a vertical axis "V” intersecting at the "A" axis of emission of the pixel light beam 1 6 have been drawn on the screen 1 8.
- the axes "H” and “ V” are graduated in degree of opening of the light beam.
- the pixel light beam 1 6 illuminates a portion of the screen 1 8 which is divided into two zones 20, 22 distinct and substantially contiguous.
- I l thus comprises a first high resolution zone 20 which is arranged in the center of the pixel light beam 1 6.
- I l also has a second low resolution zone 22 which is arranged at the periphery of the pixel light beam 1 6, around the high resolution area 20.
- the two zones 20, 22 are connected but they do not overlap.
- Each zone 20, 22 is decomposed into several substantially adjacent pixels 24, 26.
- Each pixel 24, 26 has a shape of rectangle or square.
- the pixels 24, 26 of each zone are connected to each other so that, when they are all on, the pixel light beam 1 6 substantially homogeneously illuminates a specific region of the screen 1 8.
- each pixel 24, 26 can be controlled individually between an off state and an on state. When a pixel 24, 26 is off, the screen portion 18 corresponding to this pixel 24, 26 is no longer illuminated by the pixel light beam 1 6. It is thus possible to model the pixel light beam. 1 6 to selectively shade certain portions of the screen 1 8 while illuminating around these portions.
- the high resolution area 20 has a higher resolution than the low resolution area 22. This means that the pixel density 24 of the high resolution area 20 is greater than the pixel density 26 of the low resolution area 22 This results in the fact that each pixel 24 of the high-resolution zone 20 has transverse and vertical dimensions smaller than those of a pixel 26 of the low-resolution zone 22.
- each pixel 24 of the high resolution zone 20 extends over a vertical field of less than 1 °, in particular 0.5 ° and preferably 0.3 °, and on a horizontal field of less than 1 °, in particular 0 , 5 ° and preferably 0.3 °.
- each pixel 26 of the low resolution zone 22 extends over a vertical field greater than 1 ° and over a horizontal field greater than 1 °.
- the zone of high resolution 20 extends for example transversely on a horizontal field which comprises at least the interval [-4 °, + 4 °] transversely on both sides of the optical axis "A".
- the zone of high resolution 20 extends for example transversely on a vertical field which comprises at least the interval [-4 °, + 4 °] vertically on either side of the optical axis "A" .
- all the pixels 24 of the high resolution area 20 are identical in shape and size.
- all the pixels 26 of the low resolution zone 22 are identical in shape and size.
- the pixels of the low resolution zone have different shapes and / or dimensions.
- the pixels of the upper end transverse line may have a rectangular shape stretched upwards, or the transverse end pixels may have a rectangular shape stretched transversely.
- the invention provides an optical module 1 4 simple and inexpensive to manufacture.
- an optical module 14 simple and inexpensive to manufacture.
- Each zone 20, 22 of the pixel light beam 16 is produced by light sources and associated optical elements. We will begin by describing the elements to achieve the high resolution zone 20 of the pixel light beam 1 6, then describe the elements to achieve the low resolution zone 22 of the pixel light beam 1 6.
- the optical module 1 4 comprises at least one matrix 28 of light-emitting diodes 30 extending orthogonally to the optical axis "A". This matrix 28 of light-emitting diodes is intended to illuminate the high resolution zone 20 of the pixel light beam 1 6.
- the diodes The electroluminescent elements 30 of the matrix 28 may be individually controlled or may be individually controlled in groups.
- the light-emitting diodes 30 of the array 28 each have a light-emitting surface which are all identical in shape and size.
- the light emitting surfaces of two adjacent light emitting diodes 30 are regularly spaced transversely of a determined transverse space and they are regularly spaced vertically from a determined vertical space. The larger of the two spaces is called “maximum space determined” and is referenced “E”.
- the space “E” is here the same for all adjacent LEDs of the matrix 28, both in a vertical direction and in a transverse direction.
- the space is different in the vertical direction and in the horizontal direction, the maximum space "E" can be defined in the vertical direction or in the horizontal direction.
- All light-emitting diodes 30 of the array 28 are carried by a common printed circuit board.
- the matrix 28 of light-emitting diodes 30 is a monolithic matrix, also known by the English name "monolithic leds array".
- the dimensions of the light emitting surfaces of each light emitting diode 30 are in the range of 10 to 200 microns.
- the light-emitting diodes 30 are produced on the same substrate forming a single chip.
- the matrix 28 may have a large number of rows and columns of light-emitting diodes 30, for example 32 rows on 32 columns, or 32 rows on 96 columns.
- a monolithic electroluminescent diode matrix may be have about 500 light-emitting diodes, preferably about 1000 light-emitting diodes.
- the matrix 28 of light emitting diodes 30 is formed by the arrangement of a plurality of separate light emitting diodes 30 forming individual chips.
- the light-emitting diodes 30 are arranged on the same printed circuit board.
- the dimensions of the light emitting surface of a light emitting diode 30 are greater than 0.5 millimeters.
- the number of light-emitting diodes 30 contained in the matrix is for example 2 rows on 24 columns or 3 rows on 30 columns.
- Such a matrix 28 comprises, for example, about ten light-emitting diodes 30.
- the optical module 1 4 also comprises at least one intermediate optical element 32 intended to form high-resolution object pixels 34 from the light-emitting diodes 30.
- Each optical element 32 orients the light rays emitted by a light-emitting diode 30 towards a zone defined by the object plane P of a projection optics 44 to form an associated high-resolution object pixel 34.
- the object pixels 34 are arranged in a substantially contiguous manner to form an array of object pixels 34.
- This matrix of object pixels 34 forms an image of the matrix 28 of diodes.
- the intermediate optical element 32 associated with the matrix 28 of light-emitting diodes 30 is here formed by at least one optical assembly that projects an image of each light-emitting diode 30, each image forming a pixel object 34 high resolution.
- each high resolution object pixel 34 is formed by an image of a light emitting diode 30.
- the object pixels 34 are arranged axially forward and away from the optical element 32 intermediate.
- Such an intermediate optical element 32 can be applied to all the embodiments of the invention.
- the intermediate optical element 32 is here formed by a single convergent optical assembly 32 having a single optical axis and comprising at least one lens.
- the optical assembly is here symbolized by a convergent lens 32.
- the optical assembly 32 is common to all the electroluminescent diodes 30 of the matrix 28.
- the object focus "F" of the intermediate optical element 32 is here interposed axially between the matrix 28 of light-emitting diodes 30 and said intermediate optical element 32.
- the axial position of the intermediate optical element 32 and its vergence are determined as a function of the size of the object pixels 34 that are desired to achieve the high resolution zone 20 of the pixel light beam 1 6.
- the matrix 28 comprises light-emitting diodes 30 of very small dimension, for example in the case of a monolithic matrix
- This allows the obtain a zone of high resolution 20 sufficiently large, too small pixels being irrelevant in the context of a light beam road or crossing. This is for example a homothetic enlargement.
- the ratio between the size of the object pixels 34 and the size of each light-emitting diode 30 of the matrix 28 is, for example, between 1 and 2. Since the object pixels 34 are arranged in a substantially contiguous manner, the matrix of pixel objects 34 thus obtained has dimensions greater than those of the matrix 28 of light-emitting diodes 30.
- the matrix 28 comprises light-emitting diodes 30 of larger dimensions, for example greater than 0.5 mm
- This allows to obtain image pixels sufficiently small enough to obtain a high resolution zone 20 having a sufficiently high resolution in the context of a road or crossing light beam. For example, it is a homothetic reduction.
- the ratio between the size of the object pixels 34 and the size of the light-emitting diodes 30 is for example between 0.5 and 1. Since the object pixels 34 are arranged in a substantially contiguous manner, the object pixel matrix 34 thus obtained has dimensions smaller than those of the matrix 28 of light-emitting diodes 30.
- the intermediate optical element 32 associated with the matrix 28 of light-emitting diodes 30 is formed by a light guide with a honeycomb structure in which light is guided by reflection on reflective surface.
- the high resolution object pixel 34 is formed directly at the output of the light guide 32, and not at a distance as is the case for the embodiment comprising at least one optical assembly.
- the high resolution object pixel 34 is formed directly by the output of the light guide and not by an image as is the case in the examples illustrated in the figures.
- the object pixels 34 have substantially the same dimensions as the electroluminescent diodes 30 of the matrix 28.
- each pixel 26 of the zone of low resolution 22 is produced a light source 36, hereinafter called "low resolution", which does not belong to the matrix 28 of light-emitting diodes 30.
- the low-resolution light source 36 is for example formed by a light-emitting diode or by a group of light-emitting diodes controlled simultaneously.
- Each light emitting diode forms a low resolution light source 36 which is carried by a printed circuit board 46.
- each light source 36 of low resolution is separated from adjacent light sources, including belonging to the matrix 28, a distance greater than the space "E" determined.
- Each light source 36 of low resolution is associated with a primary optical element 38 distinct from the optical element 32 intermediate.
- the primary optical element 38 is intended to form a low resolution object pixel in the same vertical plane as the high resolution object pixels 34.
- Each low resolution object pixel is powered by one of the low resolution light sources 36.
- the low resolution object pixels are arranged substantially adjacent to the array of high resolution object pixels to form the low resolution zone 22 after projection. This means that each low resolution object pixel is more particularly distinct from other low resolution object pixels, as well as high resolution object pixels.
- each primary optical element 38 is formed by a light guide 38.
- Each light guide 38 has an input face 40 receiving light rays emitted by the associated low-resolution light source 36.
- An exit face 42 of each light guide 38 is arranged substantially in the same plane as the object pixels 34 of the matrix 28. Each exit face 42 is intended to form a low resolution object pixel.
- the light guide 38 is for example a light guide formed of a solid piece of transparent material which guides the light by total internal reflection. In the examples shown in the figures, each light guide 38 has a section of square or rectangular shape.
- the primary optical element 38 is formed by a guide layer.
- a guide ply is a total internal reflection light guide whose thickness is much smaller compared to its length, which extends between the inlet face and the outlet face, and its width. Such a guide ply can be curved and present a curve. Thus, the guide ply is limited in the direction of the thickness by two extended faces and in the other directions by a slice. The thickness of the guide ply can be variable, for example decreasing from the entry face to the exit face.
- the extended faces form guide faces delimiting a solid zone of propagation of light rays by total internal reflections on said extended faces.
- the primary optical element 38 is a light guide formed by a plurality of hollow tubes forming a honeycomb structure which has reflecting internal surfaces which guide the light.
- the tubes are open at both ends in the inlet face and in the exit face, respectively.
- the primary optical element is formed by reflectors and / or collimation lenses, etc.
- two adjacent output faces 42 are substantially contiguous so that the boundary between said two low-resolution object pixels is not substantially distinguished when the associated low-resolution light sources 36 are turned on.
- the output faces 42 which are adjacent to the matrix of object pixels 34 are substantially contiguous with said matrix of object pixels 34 so that the boundary between said output faces 42 and the pixel matrix is not substantially distinguished. objects 34 when associated low light sources 36 are lit.
- each high resolution object pixel 34 formed by each light emitting diode 30 of the matrix 28 has dimensions, both transverse and vertical, smaller than the dimensions d a low resolution object pixel, here formed by the exit face 42 of each light guide 38.
- the optical module 14 further comprises a single common projection optics 44 which has a generally vertical transverse object object plane "P" which is arranged longitudinally behind said projection optics 44.
- the high-resolution object pixels 34 and the low-resolution object pixels are substantially arranged in the object focal plane P.
- the high-resolution object pixels 34 and the low-resolution object pixels are then projected by the projection optics 40 substantially to form the imaging zone. high resolution 20 and the low resolution area 22 respectively.
- the object focal plane "P" is substantially coincident with the image plane to form the high resolution zone 20 of the pixel light beam 1 6.
- the exit faces 42 of the light guides 38 are also substantially merged with the object focal plane "P" to form the low resolution zone 22 of the pixel light beam 1 6.
- the projection optics 44 forms the pixel light beam 1 6 by projecting the image of the high resolution pixel array 34 and the image of the exit faces 42 to infinity.
- the projection optics 44 creates a real image, and possibly anamorphosed, of the output faces 42 of the light guides 38 and the matrix of high-resolution object pixels, at a distance, finite or infinite, very large in front of the dimensions of the optical module 1 4, for example a ratio of the order of at least 30, preferably 100.
- This projection optics 44 may consist of one or more reflectors, or of one or more lenses, possibly in combination with one or more lenses. several light guides or a combination of these possibilities. In the embodiments shown in FIG. 3 and following, the projection optics 44 is formed by a convergent lens.
- the light-emitting diodes 30 of the matrix 28 emit white light.
- the low-resolution light sources 36 are light-emitting diodes that emit white light.
- the printed circuit boards 46 carrying the light sources 36 of low resolution are arranged in the same transverse vertical plane.
- the printed circuit boards 46 carrying the low-resolution light sources 36 are coplanar with the matrix 28 of light-emitting diodes 30.
- the low-resolution light sources 36 can thus be arranged on the same printed circuit board as the matrix 28 of light-emitting diodes 30.
- the larger “E” vertical or horizontal space remains smaller than the distance separating each source. light 36 of the matrix 28.
- the light guides 38 are shaped so that the output face 42 is arranged closer to the optical axis "A" relative to at the input face 40.
- the output face 42 is more particularly arranged in a substantially contiguous manner with the matrix of high resolution object pixels 34.
- the intermediate optical element 32 is made in one piece, made of material, with the adjacent light guides 38. This reduces the number of elements to be mounted in the optical module 1 4.
- FIG. 4 There is shown a second embodiment of the invention in Figure 4.
- the printed circuit boards 46 carrying the low-resolution light sources 36 are arranged in a plane forming an angle with respect to the plane of the matrix 28 of light-emitting diodes 30.
- the The printed circuit boards 46 form an angle of 90 ° to the plane of the die 28.
- the input faces 40 of the two upper light guides 38 are oriented vertically upward, while the input face 40 the lower light guide 38 is oriented vertically downward.
- the light-emitting diodes forming the low-resolution light sources 36 can thus be arranged on horizontal printed circuit boards 46 distinct from that carrying the matrix 28.
- This arrangement makes it possible to promote the dissipation of the heat produced by the various light sources 30, 36, in particular by equipping each printed circuit board with an associated radiator. Since the radiators are each oriented in an associated direction, their cooling, in particular by air circulation, is facilitated.
- This arrangement also makes it possible to adapt the optical module 14 to different vehicle architectures by taking up less space vertically or transversely.
- FIG. 5 shows a third embodiment of the invention.
- the low-resolution light sources 36 are arranged in a plane parallel to that of the matrix 28 but offset longitudinally. to the object plane "P" of the projection optics 44.
- the transverse printed circuit board 46 which carries the diodes electroluminescent forming low-resolution light sources 36 also serves as a frame for the optical element 32 intermediate, here a converging lens.
- the printed circuit board 46 commonly carries the light sources 36 of low resolution and the optical element 32 intermediate.
- FIG. 6 There is shown a fourth embodiment of the invention in FIG. 6. This fourth embodiment relates more particularly to the intermediate optical element 32 associated with the matrix 28. It can be combined with all the other embodiments of FIG. the invention.
- FIG. 6 is a view on a larger scale with respect to the other figures, and on which the light-emitting diodes 30 are distinguished from the matrix 28.
- the intermediate optical element 32 comprises a plurality of small optical assemblies 32A, 32B, 32C. each of which has an optical axis associated with a light-emitting diode 30 of the matrix 28. These optical assemblies 32A, 32B, 32C of small size are also called microlenses.
- the optical element 32 is thus intermediate which forms a matrix of microlenses 32A, 32B, 32C each of which is associated with a light emitting diode 30 of the matrix 28 of light emitting diodes.
- This configuration makes it possible to obtain object pixels 34 formed by individual images of each light-emitting diode 30 of the matrix 28.
- the microlenses 32A, 32B, 32C are advantageously designed and arranged in such a way that the high-resolution object pixels 34 are perfectly contiguous.
- This embodiment also makes it possible to modify the dimensions of the high-resolution object pixels 34 individually with respect to those of the associated light-emitting diode 30.
- each microlens 32A, 32B, 32C is designed to horizontally stretch the high resolution object pixel 34 relative to the associated light emitting diode.
- high resolution pixels 34 are joined horizontally.
- the vertical junction between the high-resolution object pixels 34 is then performed by slightly inclining the microlenses with respect to each other about a transverse axis to vertically bring the high-resolution object pixels 34 closer to each other. Rectangular image pixels that are contiguous are thus obtained.
- each microlens is associated with a light guide that makes it possible to precisely direct the light rays of a light-emitting diode 30 towards the associated microlens 32A, 32B, 32C without illuminating the adjacent microlenses.
- the high resolution object pixel 34 is arranged longitudinally forward and away from the microlenses 32A, 32B, 32C.
- FIG. 7 shows a fifth embodiment of the invention. The differences with the first embodiment are described later.
- the intermediate optical element 32 is formed by a light guide.
- low-resolution light sources 36 are formed by light-emitting diodes that emit white light.
- each light-emitting diode 30 of the matrix 28 emits monochromatic light, for example blue light. It will be understood that light-emitting diodes form incoherent sources of light, which are harmless to the eyes. They do not form a coherent source of light such as a laser beam.
- the optical module 14 in this case comprises a photoluminescent element 48 sensitive to the wavelength of the monochromatic light which is arranged longitudinally forward and away from the matrix 28 of light-emitting diodes 30.
- the photoluminescent element 48 has the shape of a transverse plate vertical in the direction of the thickness by a rear face and a front face.
- the photoluminescent element is a phosphor plate 48.
- the front face of the photoluminescent element 48 is arranged in the object focal plane "P" of the projection optics 44, coinciding with the exit face of the light guide forming the optical element 32 intermediate.
- edges of the photoluminescent element 48 are contiguous with the outlet faces 42 of the light guides 38 associated with the low-resolution light sources 36 which surround it.
- each light-emitting diode 30 thus reach an associated area of the rear face of the photoluminescent element 48. This causes an excitation of said area of the photoluminescent element 48 which emits back white light from its front face. .
- This zone corresponds substantially to the high-resolution object pixel 34 associated with said light-emitting diode 30.
- monochromatic light emitting diodes for the matrix 28 makes it possible in particular to avoid the appearance of chromatic aberrations, in particular by the passage of the light rays through the intermediate optical element 32 associated with the matrix 28. as much as the dimension of the emission surfaces of the light emitting diodes 30 is reduced.
- the use of monochromatic light-emitting diodes makes it possible to produce intermediate optical elements 32 comprising prisms without any risk of chromatic aberration.
- the photoluminescent element 48 makes it possible to lightly diffuse the light in its plane in order to reduce the space between the adjacent high-resolution object pixels 34 relative to the determined space "E" between the associated light-emitting diodes 30 on the matrix 28 so that two object pixels 34 are substantially joined.
- FIG. 8 shows a sixth embodiment of the invention which is similar to that of FIG. 7.
- the intermediate optical element 32 associated with the matrix 28 of light-emitting diodes 30 is no longer a light guide but an optical assembly as in the first embodiment. This makes it possible in particular to enlarge or reduce the size of the high resolution object pixel 34 relative to the actual size of the light emitting diodes 30 of the matrix 28, as already explained above.
- FIG. 9 shows a seventh embodiment of the invention which is similar to that of FIG. 7.
- the matrix 28 of light-emitting diodes 30 is arranged in a transverse vertical plane which is offset longitudinally towards the object focal plane "P" with respect to the plane of the low-resolution light sources 36.
- the low-resolution light sources 36 and the matrix 28 are carried by a common support 50.
- the common support 50 has a front transverse vertical face which is provided with a base 52 projecting longitudinally forwards to receive the matrix 28 of light-emitting diodes 30.
- This configuration makes it possible to reduce the length of the light guide forming the intermediate optical element 32 associated with the matrix 28 of light-emitting diodes 30.
- FIG. 10 shows an eighth embodiment combining the matrix 28 with light-emitting diodes 30 of FIGS. 7 to 10 with the arrangement of low resolution light sources 36 of FIG.
- This arrangement makes it easier to dissipate the heat emitted by the different light sources 36, 30. It also makes it possible to adapt the architecture of the optical module 14 to different configurations.
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Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1853755A FR3080670A1 (en) | 2018-04-27 | 2018-04-27 | OPTICAL MODULE PROJECTING A PIXEL LUMINOUS BEAM |
PCT/EP2019/060817 WO2019207147A1 (en) | 2018-04-27 | 2019-04-26 | Optical module projecting a pixelated light beam |
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EP3784953A1 true EP3784953A1 (en) | 2021-03-03 |
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Application Number | Title | Priority Date | Filing Date |
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EP19719337.8A Pending EP3784953A1 (en) | 2018-04-27 | 2019-04-26 | Optical module projecting a pixelated light beam |
Country Status (3)
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EP (1) | EP3784953A1 (en) |
FR (1) | FR3080670A1 (en) |
WO (1) | WO2019207147A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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WO2023029214A1 (en) * | 2021-09-06 | 2023-03-09 | Lumileds Llc | Led module for vehicle headlight and vehicle headlight with such led module |
WO2024044424A1 (en) * | 2022-08-25 | 2024-02-29 | Apple Inc. | Vehicle lights with multiple functions |
WO2024094283A1 (en) * | 2022-10-31 | 2024-05-10 | HELLA GmbH & Co. KGaA | Headlamp for a motor vehicle |
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JP2008123753A (en) * | 2006-11-09 | 2008-05-29 | Koito Mfg Co Ltd | Lamp unit for vehicle |
TWI572820B (en) * | 2012-12-18 | 2017-03-01 | 鴻海精密工業股份有限公司 | Litht system of vehicle headlamp |
AT514333B1 (en) * | 2013-06-25 | 2014-12-15 | Zizala Lichtsysteme Gmbh | Headlights for vehicles |
DE102016109147A1 (en) * | 2016-05-18 | 2017-11-23 | Hella Kgaa Hueck & Co. | Headlamp module with a dipped beam function and with a high beam function based on LEDs |
FR3051884A1 (en) * | 2016-05-27 | 2017-12-01 | Koito Mfg Co Ltd | VEHICLE LAMP |
FR3053435B1 (en) * | 2016-07-01 | 2020-07-17 | Valeo Vision | LIGHTING AND / OR SIGNALING DEVICE FOR A MOTOR VEHICLE |
CN109642715B (en) * | 2016-09-02 | 2021-09-17 | 株式会社小糸制作所 | Vehicle lamp |
-
2018
- 2018-04-27 FR FR1853755A patent/FR3080670A1/en active Pending
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2019
- 2019-04-26 EP EP19719337.8A patent/EP3784953A1/en active Pending
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WO2019207147A1 (en) | 2019-10-31 |
FR3080670A1 (en) | 2019-11-01 |
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