EP3513119B1 - Beleuchtungsmodul mit einer monolithischen lichtemittierenden quelle - Google Patents

Beleuchtungsmodul mit einer monolithischen lichtemittierenden quelle Download PDF

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Publication number
EP3513119B1
EP3513119B1 EP17742269.8A EP17742269A EP3513119B1 EP 3513119 B1 EP3513119 B1 EP 3513119B1 EP 17742269 A EP17742269 A EP 17742269A EP 3513119 B1 EP3513119 B1 EP 3513119B1
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EP
European Patent Office
Prior art keywords
light
electroluminescent
source
convergent
luminous device
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EP17742269.8A
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English (en)
French (fr)
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EP3513119A1 (de
Inventor
François-Xavier AMIEL
Vincent Dubois
Van-Thai HOANG
Thomas Canonne
Samira MBATA
Guillaume THIN
Antoine De Lamberterie
Nicolas Lefaudeux
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Valeo Vision SAS
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Valeo Vision SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • F21V5/004—Refractors for light sources using microoptical elements for redirecting or diffusing light using microlenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • 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]
    • F21S41/151—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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • 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
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/14—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array
    • F21Y2105/16—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array square or rectangular, e.g. for light panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to the field of light modules for land vehicles, that is to say modules which can be integrated into a light device of the vehicle and which, when using the vehicle, make it possible to project light illuminating the vehicle. road or the passenger compartment and / or allowing the vehicle to be more visible.
  • Examples of such light devices are position lights or low beam and / or high beam (commonly called "headlights").
  • a land vehicle is equipped with luminous devices, in particular lighting and / or signaling devices, such as front headlamps or rear lights, intended to illuminate the road in front of the vehicle, at night or in the event of reduced brightness. They can also be used to illuminate the interior of the vehicle.
  • luminous devices in particular lighting and / or signaling devices, such as front headlamps or rear lights, intended to illuminate the road in front of the vehicle, at night or in the event of reduced brightness. They can also be used to illuminate the interior of the vehicle.
  • These light devices can include one or more light modules. Each lighting function can be provided by one or more module (s).
  • electroluminescent light sources are increasingly used. These light sources can consist of electroluminescent diodes or LEDs (acronym for "Light Emitting Diode”), by organic light-emitting diodes or OLEDs (acronyms for "organic light-emitting diodes", or by polymeric light-emitting diodes or PLEDs. (acronyms for "polymer light-emitting diodes”).
  • Monolithic solid state light sources (also known under the name of “monolithic array of LEDs”, translation of the English expression “monolithic array of LEDs”) have recently been known.
  • a monolithic light source comprises tens, hundreds, or even thousands of LEDs which are located on the same substrate, the LEDs being separated from the others by lines (or “lanes” in English) or streets (or even “ streets ”in English).
  • LEDs are also called pixels. These light sources are said to have a high density of LEDs because the number of pixels is large, with several hundred LEDs per cm 2 .
  • Each of the LEDs is electrically independent of the others and therefore lights independently of the other LEDs in the matrix.
  • each LED of the matrix is individually controlled by the electronic circuit which manages its electrical supply (circuit called "driver" in English).
  • Solid state monolithic light sources have many advantages. First of all, they offer a high light intensity, which makes it possible to improve the lighting of the scene and thus to make driving a motor vehicle safer, for example. In addition, they create a highly pixelated light beam that enables the implementation and enhancement of existing driver assistance features, including adaptive lighting features. For example, an anti-glare function can be configured so that only the windshield of a vehicle arriving from the front is no longer illuminated.
  • solid state monolithic light sources have drawbacks.
  • these light sources heat up and involve specific management of the heat generated by the electroluminescent elements. Indeed, the heat generated causes a rise in temperature at the level of the components which can degrade the components and / or prevent their optimal use.
  • these light sources suffer from cross-talk, that is to say that the light emitted by an electroluminescent element interferes with at least the light emitted by the electroluminescent elements in its vicinity. The pixelation of the light beam emitted by the source is therefore affected. Further, part of the emitted light is lost because not all of the emitted light can be collected due to the emission angle of the light emitting elements which is large.
  • the light module for the light device comprises a solid-state electroluminescent light source (acronym for “solid-state lighting”).
  • the light emitting source includes light emitting elements that are submillimeter in size.
  • the source further comprises a substrate on which the electroluminescent elements are epitaxied.
  • Electroluminescent elements use electroluminescence to emit light. Electroluminescence is an optical and electrical phenomenon during which a material emits light in response to an electric current passing through it, or to a strong electric field. This is to be distinguished from the emission of light due to temperature (incandescence) or the action of chemicals (chemiluminescence).
  • the electroluminescent source is a monolithic electroluminescent source, that is to say that the electroluminescent elements are located and epitaxied on the same substrate, and preferably on the same face of the substrate which may for example be sapphire.
  • the electroluminescent elements are deposited on or extending from at least one side of the substrate.
  • the electroluminescent elements of the monolithic matrix are separated from each other by lines (called “lanes” in English) or streets (called “streets” in English).
  • lines and streets are synonymous. These lines or streets are spaces separating the electroluminescent elements. These spaces can be empty, or even contain elements introduced for example for the management of crosstalk phenomena.
  • the electroluminescent source monolithic forms a grid of electroluminescent elements or a matrix of electroluminescent elements.
  • a light emitting element can be, but is not limited to, a light emitting diode (LED), an organic light emitting diode (OLED), a polymeric light emitting diode (PLED).
  • the light-emitting source is therefore a semiconductor light source and it comprises a substrate from which the light-emitting elements are placed.
  • An electroluminescent element is more generally called a pixel. Therefore, the light source comprises a plurality of pixels deposited on or extending from the first side of the substrate. Pixels (i.e. light-emitting elements) emit light when the semiconductor material is supplied with electricity. We can therefore speak of an illuminated pixel when an electroluminescent element emits light.
  • the monolithic light-emitting source can be a monolithic light-emitting source with a high density of light elements, that is to say it comprises a very large number of light-emitting elements.
  • the substrate of the light source comprises at least 400 electroluminescent elements on the same substrate.
  • the pitch is 200 ⁇ m
  • the pixel density is 2500 electroluminescent elements per square centimeter (cm 2 ).
  • the dimensions of the pixels may vary, depending on the density of pixels per cm 2 sought.
  • the figure 1 shows a top view of an example of a monolithic light emitting source 1 with a high density of electroluminescent elements.
  • the figure 2 shows part of the side view of the example of the figure 1 .
  • the electroluminescent elements 8 have been deposited on a substrate 110, for example sapphire.
  • the electroluminescent elements 8 are in these examples LEDs.
  • the LEDs have been placed so that they form a grid of LEDs also called a matrix of LEDs.
  • the LEDs are separated by straight lines or streets arranged vertically 104a and horizontally 104b. The regular pattern thus formed is perfectly integrated in the current manufacturing processes of light sources.
  • the LEDs are (substantially) square in shape and have a dimension of 40 ⁇ m. This dimension refers to one of the sides of square 106. So the dimension is the width of the LED.
  • the lines or streets 104a, 104b have a whole width of 10 ⁇ m.
  • the pitch 108 between the LEDs is therefore 50 ⁇ m.
  • the pitch is the distance between the center of a first pixel and the center of a second pixel neighboring the first; this distance is also called “pixel pitch” in English.
  • the pitch therefore depends on the size of the pixels and the width of the lines or streets.
  • the electroluminescent elements 8 also have a height 109 which depends on the technology used for their manufacture. The height of a light emitting element is measured from the surface of the substrate on which the light emitting element is deposited or extends. For example, the LEDs can be 100 ⁇ m high.
  • all the LEDs and all the lines or streets of a monolithic light emitting source have dimensions which are equal or substantially equal.
  • the source forms a regular grid pattern of light emitting elements.
  • LEDs can have other shapes, depending on the technology used for their manufacture.
  • the definition of the term dimension may vary. For example, if the LEDs are rectangular in shape, we can conventionally decide that the size of an LED is the distance from the shorter side of the rectangle. As another example, if the LEDs are circular in shape, one can conventionally decide that the dimension of an LED is its diameter.
  • the electroluminescent elements are each semiconductor, that is to say they each comprise at least one semiconductor material.
  • the electroluminescent elements can predominantly be made of a semiconductor material. This semiconductor material may be the same as or different from the semiconductor material of the substrate. Electroluminescent elements can more generally all be made from the same material (s).
  • the electroluminescent elements can be of the same nature, for example substantially identical or similar. All the electroluminescent elements can be positioned to form a regular pattern, for example a grid.
  • Each of the light-emitting elements of the monolithic light-emitting source is electrically independent of the others and emits light or not independently of the other elements of the matrix.
  • Each element of the matrix is individually controlled by an electronic circuit called a “driver”.
  • the driver manages the power supply of the monolithic matrix, which amounts to saying that it individually manages the power supply of each electroluminescent element.
  • electroluminescent elements can be grouped together electrically, for example by supplying them electrically using a parallel or series connection, in order to reduce the number of elements to be managed.
  • the groups can comprise between two and four electroluminescent elements, this number making it possible to maintain a sufficiently pixelated light beam.
  • the driver is therefore an electronic device which is able to control the elements of a monolithic matrix of electroluminescent elements.
  • Several drivers can be used to drive the light-emitting elements of the source.
  • the light module can include one or more monolithic light emitting sources. Several light modules comprising such a monolithic light-emitting source can be integrated into the light device according to the invention.
  • the term “light module” therefore designates at least one monolithic electroluminescent source.
  • the light module further comprises a layer covering the semiconductor material.
  • This layer changes the spectrum of the light emitted by the semiconductor material.
  • the spectrum is defined by a continuum of wavelengths, and the layer therefore changes the wavelengths of electromagnetic radiation forming the spectrum of emitted light.
  • Cover means that the layer is arranged with respect to the semiconductor material so that the light it emits passes through the layer. The latter may be in contact with at least the surface of the semiconductor material through which the light produced by the semiconductor material escapes.
  • a third material can serve as an interface between the layer and the surface of the semiconductor material through which the light produced by the semiconductor material escapes; this third material can be silicone which is a polymer.
  • the figure 2 shows an example in which each light emitting element is individually covered by the layer 120.
  • Layer 120 is a light converter or phosphor, and it comprises at least one phosphor material designed to absorb at least part of at least one excitation light emitted by a light source and to convert at least part of said light excitation absorbed into an emission light having a different light spectrum from that of the excitation light.
  • the light module for the light device therefore comprises a monolithic light-emitting source which can have a high density of light-emitting elements.
  • the light module further comprises a primary optical system which is provided with a plurality of converging optics.
  • Each converging optic of the primary optical system forms an image of a light emitting source.
  • One or more converging optics is associated with each electroluminescent element.
  • the association is exclusive, that is to say that the optics are responsible for converging the light of a single electroluminescent element.
  • an optic is associated with an electroluminescent element.
  • the converging optic forms an image of the electroluminescent element with which it is associated.
  • the image formed is preferably a virtual image. The creation of a real image can also be envisaged.
  • the electroluminescent elements of the monolithic source preferably form a matrix of electroluminescent elements. As explained with reference to the figure 1 , the electroluminescent elements are placed on the substrate of the source in a regular pattern, for example that of a grid.
  • the converging optics also preferably form a matrix of converging lenses. The converging lenses of the converging lens array are arranged such that there is a correspondence between a light emitting element and the lens associated with it, for example the lens covers the light emitting element.
  • the matrix of converging lenses may not necessarily be strictly the same as the monolithic source; for example, a slightly different pitch may be used to reorient the rays emitted by the electroluminescent elements at the edge of the monolithic electroluminescent source.
  • Patterns other than a regular grid can be considered for the matrices of electroluminescent elements and convergent optics; for example the elements of a line are offset from another neighboring line. Any pattern, whether regular or not, can be considered.
  • the electroluminescent elements are preferably submillimeter in size so that the monolithic source has a high density of light pixels.
  • converging optics are converging microlenses of millimeter or submillimeter dimensions.
  • the figure 4 shows an example of a grid of converging microlenses with optical center “O” through which the optical axis passes.
  • the figure 5 schematically shows an example of a set of converging microlenses, for example the grid of microlenses shown on the figure 4 , whose optical axes (represented by dotted lines 15 passing through their optical center "O") are aligned with the center "O '" of the electroluminescent elements 8.
  • microlenses denote diopters making the light converge, the external dimensions of which are less than or equal to five times the dimensions of the electroluminescent elements of the light source.
  • the microlenses have a dimension which is between one and five times, limits included, those of the electroluminescent elements.
  • an electroluminescent element has a length L and a width l as dimension, denoted (Lxl)
  • the microlens will have a dimension (L'xl ') with L ⁇ L' ⁇ 5xL and l ⁇ l ' ⁇ 5xl. This sizing makes it possible to maintain good luminance.
  • the dimensions of the associated diopter will be inscribed in a square with a maximum side of 250 ⁇ m.
  • Microlenses are generally in the submillimeter order of magnitude.
  • the converging optic is placed, relative to the electroluminescent element with which it is associated, at a distance which is less than or equal to the focal length of the object of the converging optics in order to ensure the creation of a virtual image of the electroluminescent element.
  • the virtual image thus created can serve as a new light source, for example for a projection lens.
  • the virtual image obtained is enlarged relative to the electroluminescent element.
  • the primary optical system for example a matrix of microlenses, therefore makes it possible to form virtual images of the electroluminescent elements of the monolithic electroluminescent source.
  • the converging optic may be placed, relative to the light emitting element with which it is associated, at a distance which is greater than the object focal length of the converging optic in order to ensure the creation of a real image of the electroluminescent element.
  • the microlens must have a much shorter focal length and must therefore be more curved, which complicates its production.
  • the converging optic may further be placed at a distance from the light emitting element which is chosen so that the converging optic collects the greatest amount of light emitted by the light emitting element.
  • the electroluminescent element sends light over half a space - in practice a 180 ° emission cone -, so it is very difficult to collect all the light it emits.
  • the distance chosen is as short as possible so that the converging optic is as close as possible to the electroluminescent element in order to capture a maximum of light emitted by the electroluminescent element: the loss of the emitted light is thus minimized. Almost all of the light emitted can be recovered, resulting in maximum light energy used.
  • the converging optics are in contact with the electroluminescent elements, that is to say that there is no intermediate element such as for example air between the electroluminescent elements and the optics. convergent. There is no loss of light by passing light through air or any other material.
  • an intermediate element forms the junction between the converging optics and the electroluminescent elements. The material serving as the intermediate element is selected to avoid losses.
  • the plurality of converging optics of the system primary optics can cover the monolithic light emitting source.
  • the electroluminescent elements and the streets / lines separating them are covered by the primary optical system.
  • the dimensions of the two associated convergent optics - or that of said at least one converging optic with which the first electroluminescent element is associated and that of said at least one converging optic with which the second electroluminescent element is associated will be chosen so that the two lenses cover the two electroluminescent elements over the entire length of the pitch given.
  • the converging lenses can be separate, and therefore do not form a single element. This may for example be the case of electroluminescent elements individually covered with a lens.
  • the pitch 108 between the LEDs includes the edge-to-edge distance of an LED 8 as well as the width of a street 104a, 104b - all LEDs and streets in the source are of equal size, and each micro lens has dimensions (L'xl ') which are equal to the pitch so that each microlens covers the entire LED and all or part of the streets.
  • the covering of the electroluminescent elements by the converging optics of the primary optical system makes it possible to ensure that all of the light emitted by the electroluminescent elements is used in the light beam generated, for example at the output of the primary optical system.
  • a 70% increase in the light intensity of the light beam generated by the light module has been measured for the light device according to the invention to be compared with a light module of the state of the art: in fact, the light module for the light device according to the invention recovers all the light emitted by the electroluminescent elements. Thanks to this observed increase, the light module for the light device according to the invention allows a reduction in the size of the emissive surfaces of the electroluminescent elements while having a light intensity at least equal to that obtained with the light modules known from the prior art.
  • the reduction in the size of the emissive surfaces can be achieved by increasing the width of the streets / lines separating the electroluminescent elements. Alternatively, the dimensions of the electroluminescent elements can be reduced.
  • a reduction in the emissive (light) surfaces of the light emitting source associated with the primary optical system provides greater luminance as well as an increase in luminous flux. Thanks to this reduction in the size of the emissive surfaces, the light source consumes less energy, which makes it possible to reduce the amount of heat to be evacuated from the light module.
  • the junctions of the semiconductor materials of the electroluminescent elements work at lower temperatures, which offers greater efficiency, a longer life for the electroluminescent elements. It is also possible to supply them with a higher current density to increase the luminance.
  • the manufacture of the light source is facilitated, which can have an economic advantage.
  • a greater spacing of the electroluminescent elements also makes it possible to reduce the phenomena of crosstalk ("cross-talk" in English), the greater spacing between the elements being compensated by the primary optical system which recovers all the light even emitted at an angle. important emission.
  • the pitch of the monolithic light-emitting source may be less than or equal to 1 mm, and is preferably between 500 and 20 micrometers ( ⁇ m), limits included.
  • the dimensions (Lxl) of an electroluminescent element are preferably between 10 and 500 micrometers ( ⁇ m), limits included.
  • the figure 6 shows an example of an optical module 1 for projecting a light beam, in particular for a motor vehicle.
  • the module 1 comprises, from upstream to downstream in the direction of propagation of the light rays along the optical axis 15, a monolithic light-emitting source 2 comprising light-emitting elements 8 capable of emitting light rays, a primary optical system 4 which transmits the rays light, and projection means configured to project a light beam from the incident light rays transmitted by the primary optical optical system 4.
  • the projection means take the form of a single projection lens 3.
  • the projection means could nevertheless be formed of the association of several lenses, of several reflectors, or even of a combination of one or more lenses and / or of one or more reflectors.
  • the light-emitting elements 8 are for example light-emitting diodes (LEDs) forming an array on the matrix 2 of light-emitting elements, as shown in the figures. figures 1 and 2 .
  • LEDs light-emitting diodes
  • the primary optical system 4 has the function of transmitting light rays from the electroluminescent elements so that, combined with the projection means, here in the form of a projection lens 3, the beam projected outside the module, for example on the route, is homogeneous.
  • the primary optical system 4 is provided with a plurality of converging optics, which are preferably converging microlenses 5.
  • the input diopters 5 have a convex surface, that is to say they are curved outwards, in the direction of the sources 8. The surface could however be plane, plane-convex or concave-convex. .
  • An input diopter 5 is advantageously arranged downstream of each light source 8, that is to say of each electroluminescent element.
  • the input diopters 5 preferably form virtual images 6 of the electroluminescent elements 8.
  • the virtual images 6 are formed upstream of the electroluminescent elements 8, and thus serve as new light sources for the projection lens 3.
  • the virtual images 6 obtained are enlarged and preferably substantially adjacent. In other words, they are not separated by a significant space.
  • the adjoining virtual images may have a slight overlap between them, which will result in an overlap of their respective projections by the projection means measured on a screen placed 25 m from the device which will preferably be less than 1 °.
  • the primary optical system 4 therefore makes it possible to form virtual images 6 of the primary sources 8 of light in order to obtain a homogeneous distribution of the beam, that is to say that the components of the light beam are correctly adjusted with respect to each other. others, without dark and / or shiny bands (overcurrent) between them which would adversely affect driving comfort.
  • the streets or lines present on the monolithic source are not visible in the light beam generated at the output of the primary system 4 and of the projection lens 3, and even if the streets / lines have increased dimensions in an effort to reduce emissive surfaces of the source.
  • the pixelation of the source 2 is preserved, ie the light beam generated consists of as many pixels of light as there are electroluminescent elements on the source. If the source is a highly pixelated monolithic source, then the light beam retains this high pixelation. As a result, the generated light beam can be used in driving assistance functions which require adaptive lighting, for example an anti-glare function.
  • the virtual images 6 are further from the projection lens 3 with respect to the real matrix of light sources, which makes it possible to keep a compact optical module.
  • the primary optical system 4 can be advantageously configured to form virtual images 6 on a curved surface, the dimensions of the virtual images 6 being larger than the dimensions of the primary sources 8 of light. This case is illustrated on the figure 7 .
  • the curved surface compensates for the curvature of the field of the projection system 3.
  • the primary optical system 4 can be configured to form virtual images 6 on a plane, the dimensions of the virtual images 6 being larger than the dimensions of the primary sources 8 of light. This case is illustrated on the figure 6 .
  • the enlargement of the size of the virtual images 6 allows a juxtaposition of the virtual images 6 so as to be adjacent to each other to form a continuous homogeneous light distribution.
  • the convex curvature and the material making up the matrix of converging optics are adapted to the dimensions of the source 2 of electroluminescent elements 8, as well as the positioning of the primary optical optical system 4 with respect to the source 2, so that the virtual images 6 are correctly juxtaposed to form a continuous homogeneous light distribution.
  • the distance between the monolithic electroluminescent source and the primary optical system 4 will be including, for example, from 0 mm to twice the pitch of the electroluminescent elements, terminals included. These distances allow enough light to be collected.
  • the primary optical system 4 provided with the input diopters 5 further comprises a single output diopter 9 for all the input diopters 5.
  • the output diopter 9 provides an optical correction of the beam transmitted to the lens. projection 3.
  • the correction serves in particular to improve the optical efficiency of the device and to correct the optical aberrations of the projection optical system 3.
  • the output diopter 9 has the shape of a substantially spherical dome. This shape deviates little from the direction of the light rays of the beam coming from an electroluminescent element arranged on the optical axis 15, and which pass through the output diopter 9.
  • the output diopter may have an elongated shape, of the cylindrical type, with a bifocal definition. In frontal view, the output diopter 9 is wider than it is high. According to a preferred embodiment of this variant, the output diopter 9 has in horizontal section - therefore in the direction of its width - a large radius of curvature.
  • the primary optical system 4 is made from a single material, that is to say from one material.
  • the input diopters 5 and the output diopter 9 form the entry and exit faces of the same element, the primary optical system 4, which is similar to a complex lens.
  • the example of figure 7 uses the same elements as that of the figure 6 , except that the primary optical system 4 comprises an output micro-diopter 9 for each input micro-diopter 5.
  • the primary optical system 4 then forms a set of bi-convex microlenses, each microlens being placed in front of a primary source of light .
  • the primary optical system 4 is an array of microlenses, for example the one shown in figure 4 .
  • the microlens do not make it possible to correct the overall transmitted beam, such as a primary optical system 4 provided with a single output diopter 9.
  • the correction of the overall beam can be achieved by the projection means 3.
  • the microlenses are however suitable for light-emitting sources with high pixel density for which the light-emitting elements are of submillimeter size. They have the advantage of providing better homogeneity of the virtual images and less distortion of the images.
  • the microlenses have a collection angle of the emitted light which must be maximum so that they collect all the light even emitted with a large emission angle.
  • the collection angle can preferably be between 30 ° and 70 °, limits included.
  • the figure 3 schematically shows an example of a light module for a motor vehicle.
  • the light module 1 comprises a high density monolithic electroluminescent source 2 on which a phosphor layer is deposited, a PCB 14 which supports the source 12 and a device 19 which controls the electroluminescent elements of the monolithic light source 2. Any other support than ' a PCB can be considered.
  • the light module further comprises an array of microlenses 4.
  • the light module can further comprise at least one heat sink 18 which can be arranged directly or indirectly on the source 12. In this example, the heat sink 18 is arranged indirectly on the source 12. the source since the PCB 14 and a thermal interface 16 are located between the heat sink 18 and the source 12.
  • the heat sink allows the transfer of heat from the light emitting source that the latter transmits to the PCB when using a light module.
  • the heat sink enables heat dissipation via cooperation with the support 14 of the monolithic light emitting source, i.e. the heat sink receives the heat produced by the light emitting source.
  • the heat sink 18 is thus in heat communication with the PCB 14 which is itself in heat communication with the source 12.
  • the transmission can be ensured by the fact that the heat sink is in one example arranged directly against the PCB 14. This means that the heat sink is in physical (ie material) contact with the PCB.
  • the heat sink 18 can however be alternately arranged on the PCB via an intermediate element which improves the heat transfer. This intermediate element is also called a thermal interface 16.
  • the intermediate element 16 may for example comprise thermal paste or a phase change material.
  • the intermediate element can comprise copper, for example the thermal interface 16 is a copper plate.
  • the invention relates to a light device comprising such a projection device and projection means, such as a projection lens or a reflector, arranged downstream of the primary optical system in the direction of projection of the light beam, the projection means being able to project a light beam from the virtual images serving as light sources to the projection means which are focused on said virtual images.
  • projection means such as a projection lens or a reflector
  • This last characteristic of the invention is particularly interesting and advantageous. Indeed, the focusing of the projection means on the virtual images, in particular on the plane which contains said virtual images, makes the projection optical module not very sensitive to the production defects of the primary optical system: if the projection means are focused on the surface of the diopters, it is this surface which is imaged and therefore all its production defects which are made visible, which can generate homogeneity or chromatism defects in the projected light beam.
  • this makes it possible to use a matrix of electroluminescent elements with streets / lines of significant dimension in association with the primary optics, each electroluminescent element being individually imaged and the generated beam not showing gaps between the different beams. light composing the beam of the source.
  • the present disclosure also relates to a motor vehicle headlight provided with such an optical module.

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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)
  • Led Device Packages (AREA)

Claims (13)

  1. Beleuchtungsvorrichtung (1), insbesondere zur Beleuchtung und/oder zur Signalisierung, vorzugsweise eines Landfahrzeugs, die Folgendes beinhaltet:
    - ein Beleuchtungsmodul, das Folgendes beinhaltet:
    - eine monolithische lichtemittierende Quelle (2), die lichtemittierende Elemente (8) beinhaltet;
    - ein primäres optisches System (4), das über eine Vielzahl von konvergierenden Optiken verfügt, wobei mindestens eine konvergierende Optik mit jedem lichtemittierenden Element assoziiert ist und ein Bild (6) des lichtemittierenden Elements, mit dem sie assoziiert ist, bildet;
    wobei die Beleuchtungsvorrichtung ferner Folgendes beinhaltet:
    - ein optisches Projektionssystem (3), das aus den durch das primäre optische System produzierten Bildern ein Bild bildet;
    dadurch gekennzeichnet, dass:
    - der Abstand zwischen der mindestens einen konvergierenden Optik (4) und dem lichtemittierenden Element (8), mit dem die mindestens eine konvergierende Optik assoziiert ist, kleiner als die Brennweite der mindestens einen konvergierenden Optik ist, um die Erzeugung eines virtuellen Bildes (6) des lichtemittierenden Elements sicherzustellen; und
    - das optische Projektionssystem (3) dazu fähig ist, anhand der virtuellen Bilder (6), die durch das primäre optische System (4) produziert werden und die dem Projektionssystem, das auf die virtuellen Bilder fokussiert ist, als Lichtquellen dienen, ein Beleuchtungsbündel zu projizieren.
  2. Beleuchtungsvorrichtung (1) nach Anspruch 1, wobei:
    - die lichtemittierenden Elemente (8) der monolithischen Quelle (2) eine Matrix aus lichtemittierenden Elementen bilden; und
    - die konvergierenden Optiken eine Matrix aus konvergierenden Mikrolinsen (5) bilden.
  3. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 2, wobei die optische Achse (15) der mindestens einen konvergierenden Optik auf den Mittelpunkt (0') des lichtemittierenden Elements (8), mit dem die mindestens eine konvergierende Optik assoziiert ist, ausgerichtet ist.
  4. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 3, wobei der Sammelwinkel der konvergierenden Optiken einschließlich Anschlüssen zwischen 30° und 70° liegt.
  5. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 4, wobei die Vielzahl von konvergierenden Optiken des primären optischen Systems (4) die monolithische lichtemittierende Quelle (2) abdeckt.
  6. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 5, wobei die Vielzahl von konvergierenden Optiken mit der monolithischen lichtemittierenden Quelle (2) in Kontakt ist.
  7. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 5, wobei zwischen der Vielzahl von konvergierenden Optiken und der monolithischen lichtemittierenden Quelle (2) ein Zwischenelement angeordnet ist.
  8. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 7, wobei der Abstand (108) zwischen dem Mittelpunkt eines ersten Pixels und dem Mittelpunkt eines zweiten Pixels, das an das erste angrenzt, zwischen 20 und 500 Mikrometern (µm) liegt.
  9. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 8, wobei die Maße eines lichtemittierenden Elements (8) zwischen 10 und 500 Mikrometern (µm) liegen.
  10. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 9, wobei das primäre optische System (4) so angeordnet ist, dass die Bilder (6), die es bildet, im Wesentlichen aneinander angrenzend sind, um eine kontinuierliche homogene Lichtverteilung zu bilden.
  11. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 10, wobei jede konvergierende Optik mindestens einen konvexen Abschnitt beinhaltet.
  12. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 11, wobei die Vielzahl von konvergierenden Optiken aus einem Stück ausgebildet ist.
  13. Beleuchtungsvorrichtung (1) nach einem der Ansprüche 1 bis 12, wobei die lichtemittierenden Elemente (8) der monolithischen lichtemittierenden Quelle (2) lichtemittierende Dioden sind.
EP17742269.8A 2016-09-15 2017-07-26 Beleuchtungsmodul mit einer monolithischen lichtemittierenden quelle Active EP3513119B1 (de)

Applications Claiming Priority (2)

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FR1658664 2016-09-15
PCT/EP2017/068934 WO2018050337A1 (fr) 2016-09-15 2017-07-26 Module lumineux a source electroluminescente monolithique

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EP3513119A1 (de) 2019-07-24
CN109716016A (zh) 2019-05-03
US10683986B2 (en) 2020-06-16
US20190203907A1 (en) 2019-07-04

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