WO2009033454A1 - Module à diodes électroluminescentes - Google Patents

Module à diodes électroluminescentes Download PDF

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Publication number
WO2009033454A1
WO2009033454A1 PCT/DE2008/001450 DE2008001450W WO2009033454A1 WO 2009033454 A1 WO2009033454 A1 WO 2009033454A1 DE 2008001450 W DE2008001450 W DE 2008001450W WO 2009033454 A1 WO2009033454 A1 WO 2009033454A1
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WO
WIPO (PCT)
Prior art keywords
light
emitting diode
lenses
radiation
lens
Prior art date
Application number
PCT/DE2008/001450
Other languages
German (de)
English (en)
Inventor
Julius Muschaweck
Herbert Brunner
Original Assignee
Osram Opto Semiconductors Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osram Opto Semiconductors Gmbh filed Critical Osram Opto Semiconductors Gmbh
Publication of WO2009033454A1 publication Critical patent/WO2009033454A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • 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
    • 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
    • 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
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • 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
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • 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
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • 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
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • 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 a light-emitting diode module according to claim 1.
  • Light-emitting diode modules are known for example from the document WO 2006/045545 Al. These modules include an array of light sources and a microlens array arranged in a particular pattern with one lens each associated with a light source.
  • This module has the disadvantage that by the assignment of a light source to each lens white light is emitted with an inhomogeneous light distribution, and that the module has no good color mixing in the far field.
  • the invention has for its object to provide a light-emitting diode module with an improved homogeneous, white light distribution and with improved color mixing of the emitted from the light-emitting diode module white radiation in the far field.
  • the light-emitting diode module contains a lens array with a plurality of lenses, wherein each lens is rotationally symmetrical about an optical axis. Each lens has a concave entrance surface and a convex exit surface.
  • At least three light-emitting diodes are arranged in front of each lens, with one light-emitting diode each emitting radiation in the red spectral range, one light-emitting diode emitting radiation in the green spectral range and one light-emitting diode emitting radiation in the blue spectral range ("RGB LEDs").
  • the "color locus” defines the numerical values which describe the color of the emitted light of the light-emitting diode module in the CIE standard color chart.
  • the lens Due to the special shape of the lens, which is characterized by the concave entrance surface and the convex exit surface, in combination with the at least three light-emitting diodes, which are arranged in front of each lens, and the radiation in the red spectral range, radiation in the green spectral range and radiation in the blue spectral range emit, improved efficiency and uniform color mixing and brightness in the far field is achieved. Furthermore, the module is inexpensive to produce. Due to the concave entrance surface of the lens, it is possible that the entrance surface preferably encloses the light-emitting diodes almost completely. As a result, a wide angular range of the radiation emitted by the light-emitting diodes is detected by the lenses, and thus by the lens array.
  • an angle range between 150 ° and 180 °, for example in the angular range of 170 °, is detected by the lens.
  • the light-emitting diodes are preferably arranged as close as possible to the entrance surface of the lens, wherein the light-emitting diodes group as evenly as possible about an optical axis of the lens.
  • the concave entrance surface collimates and contributes to the bundling of the radiation.
  • the lens entry surfaces which preferably contains air.
  • the air gap between the light-emitting diodes and the respective lens advantageously reduces the heat transfer from the light-emitting diodes to the lens.
  • the lens array therefore does not experience as high temperatures as lens arrays in conventional modules, which preferably results in a larger choice of material for the lens array.
  • the lens array preferably has a plastic. Furthermore, the air gap makes it possible to largely avoid radiation hotspots.
  • the lens array has a transparent thermoplastic, preferably polycarbonate, PMMA or polyimide (PI).
  • the lens array may include silicone or a silicone thermoplastic compound.
  • the lenses of the lens array have a light-scattering structure on the exit surfaces.
  • the scattering exit surfaces is a homogenization of the radiation at the edge of the lenses, resulting in an overall improved homogenization of the light emitted by the light emitting diode module in the near and far field.
  • the lens array contains exactly six lenses.
  • the six lenses are arranged rotationally symmetrical to each other. Due to the special arrangement of the lenses, an improved color mixing in the far field can furthermore preferably be achieved.
  • each lens in front of each lens exactly four light-emitting diodes, which are arranged rotationally symmetrical to one another, are arranged, one light-emitting diode emitting radiation in the red spectral range, two light-emitting radiation in the green spectral range and one light emitting radiation in the blue spectral range ("RGGB LEDs").
  • the four light-emitting diodes lie on corner points of an imaginary rectangle, preferably an imaginary square. Due to the rotationally symmetrical arrangement of the light-emitting diodes in combination with the specially designed upstream lens array, the color mixing in the far field improves further. Inhomogeneities of the emitted radiation of the module, which would be caused by the special shape of the lenses, but without the special rotationally symmetrical arrangement of the LEDs are compensated by the special arrangement of the LEDs.
  • the lenses penetrate at least partially.
  • the lenses of the lens array preferably at least partially overlap.
  • the lens array is formed in one piece.
  • the lens array is a coherent, one-piece device. This has the advantage that in the production of the module with a plurality of light-emitting diodes exactly one coherent and integrally formed lens array can be produced. This can advantageously reduce the production time and production costs. Furthermore, the stability of the lens array increases and it facilitates the manufacture of the lens array by means of an injection molding process.
  • At least one further embodiment provides that the lenses in each case combine the radiation of the respective light-emitting diodes arranged in front of the lens in such a way that an angular distribution of the radiation after the passage of the lens has a full half-width of less than 80 °.
  • the radiation is thus advantageously concentrated essentially in an angular range of +/- 40 degrees about an optical axis of the lens.
  • This bundling of the radiation is due to the special shape of the lenses, which have a concave entrance surface and a convex exit surface, in combination with the rotationally symmetrical arrangement of the light emitting diodes.
  • the bundling of the radiation improves the color mixing of the radiation in the far field. Inhomogeneities of the radiation of the light-emitting diode module are advantageously thereby largely compensated.
  • the entry surfaces and the exit surfaces of the lenses are aspherical.
  • the lens one has the possibility to correct aberrations, since the entry surfaces and the exit surfaces the lenses are freely selectable.
  • the spherical aberration can be corrected.
  • a certain entrance angle of the radiation emitted by the light emitting diodes can be imaged to a specific exit angle.
  • a predetermined exit angle of the radiation from the lens thus a predetermined angular distribution of the radiation after passing through the lens and thus substantially a predetermined bundling of the radiation after passing through the lens take place.
  • structures and radiation hotspots of the light-emitting diodes can advantageously be largely eliminated by the downstream lens array, so that the emitted radiation of the light-emitting diode module has a uniform light distribution.
  • the lens array is followed by a Fresnel lens.
  • the lens array preferably focuses the radiation emitted by the light-emitting diodes in such a way that an angular distribution of the radiation after passing through the lens array has a full half width of less than 80 °.
  • the Fresnel Lens bundles the already bundled by the lens array radiation in a smaller angle range. By further bundling the radiation in a smaller angular range in combination with the special symmetrical arrangement of the LEDs inhomogeneities of the radiation of the light-emitting diode module can be advantageously further compensated.
  • the color mixing in the far field preferably improves further. Furthermore, a narrow angular distribution of the emitted radiation of the light-emitting diode module with high efficiency is possible.
  • the Fresnel lens has an exit side, are applied to the Auskoppel aside.
  • the decoupling properties of the Fresnel lens advantageously improve, as a result of which the homogeneity of the radiation and good color mixing of the radiation in the far field of the light-emitting diode module can be achieved.
  • the Fresnel lens is followed by a honeycomb condenser.
  • This honeycomb condenser preferably has entrance lenses and exit lenses.
  • the honeycomb condenser ensures a good color and brightness homogeneity of the light-emitting diode module in the far field and a lack of color shade.
  • the exit lenses of the honeycomb condenser are preferably arranged in the focal point of the entry lenses.
  • the entrance lenses have a greater curvature than the exit lenses. This achieves improved color and brightness homogeneity in the far field and the absence of color shadows.
  • the entrance lenses and the exit lenses of the honeycomb condenser each have optical axes, wherein the optical axes of the entrance lenses are preferably laterally displaced relative to the optical axes of the exit lenses.
  • the exit lenses are arranged in the focal point of the entrance lenses.
  • the exit lenses are displaced in the direction of the entrance lenses. This results in a blurring of the image in the far field, which advantageously a good color and brightness homogeneity of the light-emitting diode module in the far field and the absence of color shade can be achieved.
  • the Fresnel lens and the subsequently arranged honeycomb condenser are cylindrical.
  • the diameter of the Fresnel lens and the honeycomb condenser is preferably between 40 mm and 120 mm, particularly preferably 50 mm.
  • a sensor is arranged centrally between the at least four lenses. The sensor determines values for the brightness and chromaticity of the radiation impinging on the Fresnel lens.
  • the LEDs can be controlled individually, for example. Each light-emitting diode can thus be energized independently of the other light-emitting diodes of the module.
  • the light-emitting diodes are arranged in groups of a plurality of light-emitting diodes, which are connected, for example, in series with one another and thus can be driven exclusively together.
  • the current can be controlled by certain light-emitting diodes so that the light-emitting diode module emits radiation of a particular color locus.
  • the light emitting diodes are arranged on a substrate on which the lens array is applied.
  • the substrate preferably contains Al or Cu.
  • the substrate can be formed as an injection molded interconnect device (molded interconnect devices, MID), as a DBC substrate (direct bond copper) or as a printed circuit board (PCB).
  • the light-emitting diodes are preferably designed to be surface mountable.
  • Surface mountable components are characterized by a particularly simple handling, especially when mounting on the carrier plate, preferably during assembly on a circuit board. For example, they can be positioned on a printed circuit board by means of an automatic pick and place process and subsequently electrically and / or thermally connected.
  • the lens array may preferably be applied and fixed by gluing, hot caulking or snap hooks on the substrate. Alternatively, a combination of assembly techniques is possible.
  • the Fresnel lens with downstream honeycomb condenser is preferably arranged at a distance of between 20 mm and 100 mm from the substrate. Particularly preferably, the distance between the substrate and the Fresnel lens with downstream honeycomb condenser is 27 mm.
  • the substrate has recesses in which the light-emitting diodes are arranged.
  • the depressions serve as a reflector for the radiation emitted by the light emitting diodes.
  • the preferred serve as a reflector, advantageously, the efficiency of the light-emitting diode module can be increased.
  • the light-emitting diodes can each be arranged individually in a depression of the substrate. In this case, advantageously only a small fraction of the radiation emitted by a light-emitting diode is absorbed by the other light-emitting diodes. Such a light-emitting diode module is therefore characterized essentially by an improved light output.
  • the light emitting diodes which are arranged in front of a respective lens, may be arranged together in a recess of the substrate.
  • the distance between the LEDs and the entry surfaces of the lenses of the lens array is smaller than the focal length of the lenses.
  • the concave entrance surface of the lenses acts collimating or focusing on the respective radiation of the individual LEDs.
  • the close arrangement of the light-emitting diodes on the lenses has the advantage that structures and color gradients of the light-emitting diodes are imperceptible to a viewer. This gives a homogeneous light distribution of the emitted radiation in the color locus of white light.
  • the light emitting diodes comprise an active layer sequence, which preferably has a pn junction, a double heterostructure, a single quantum well or particularly preferably a multiple quantum well structure (MQW) for generating radiation.
  • the term quantum well structure encompasses in particular any structure in which charge carriers can undergo quantization of their energy states by confinement.
  • quantum well structure does not include information about the dimensionality of the quantization. It thus includes quantum wells, quantum wires and quantum dots and any combination of these structures.
  • the light-emitting diodes are particularly advantageous thin-film LED chips.
  • an LED chip is considered a thin-film light-emitting diode chip, during the manufacture of which the growth substrate on which a layer sequence for the LED chip has been grown, for example epitaxially, is thinned or, in particular, completely detached.
  • a thin-film light-emitting diode chip is, to a good approximation, a Lambertian surface radiator and is therefore particularly well suited for use in a headlight.
  • FIG. 1 shows a schematic cross section of a first exemplary embodiment of a light-emitting diode module according to the invention
  • FIG. 2 shows a schematic cross section of a further exemplary embodiment of a light-emitting diode module according to the invention
  • FIG. 3 shows a schematic side view of an inventive light-emitting diode module according to a third embodiment
  • FIG. 4 shows a schematic view of the third exemplary embodiment of the light-emitting diode module according to the invention from below,
  • Figure 5 shows a schematic cross section of a fourth embodiment of a light emitting diode module according to the invention.
  • Figure 6 is a schematic side view of the light emitting diode module according to the invention according to the fourth embodiment.
  • the light-emitting diode module shown in Figure 1 has a lens array of two lenses 2, wherein each lens 2 is rotationally symmetrical about each optical axis 3 is formed. Each lens 2 has a concave entrance surface 9 and a convex exit surface 10. In front of each lens 2, three light emitting diodes 1 are arranged, the light emitting diodes 1 being arranged rotationally symmetrically about the optical axis 3 (only two of the three light emitting diodes 1 are shown in FIG. 1).
  • One of the light-emitting diodes 1 emits radiation in the red spectral range, a light-emitting diode 1 emits radiation in the green spectral range and a light-emitting diode 1 emits radiation in the blue spectral range ("RGB LEDs").
  • the concave entrance surface 9 preferably encloses the light-emitting diodes 1 almost completely. As a result, a wide angular range of the radiation emitted by the light-emitting diodes 1 is detected by the lens 2 and thus by the lens array.
  • the light-emitting diodes 1 are preferably arranged as close as possible to the respective entry surface 9 of the lens 2.
  • the lens 2 which is characterized by the concave entrance surface 9 and the convex exit slit 10, in combination with the three rotationally symmetrical about the optical axis 3 arranged LEDs 1, which are arranged in front of each lens 2, an improved efficiency, a uniform color mixing of the RGB LEDs 1 and improved brightness in the far field achieved.
  • a distance 11 is present, which preferably contains air.
  • the air gap between the LEDs 1 and the respective Lens 2 advantageously reduces the heat transfer from the light-emitting diodes 1 to the lens 2.
  • the lens array therefore does not experience as high temperatures as lens arrays in conventional modules, which preferably results in a greater selection of materials for the lens array.
  • the lens array comprises a plastic, in particular a thermoplastic, preferably PMMA or polycarbonate.
  • the air gap makes it possible to largely avoid radiation spots (hotspots).
  • the exit surfaces 10 of the lenses 2 may preferably be formed scattering. This results in a homogenization of the radiation at the edge of the lenses, resulting in an overall improved homogenization of the light emitted by the LED module radiation in the near and far field.
  • the lenses 2 in each case combine the radiation of the light-emitting diodes 1 arranged in front of the lens 2 in such a way that an angular distribution of the radiation after passing through the lens 2 has a full half width of less than 80 °.
  • the bundling of the radiation improves the color mixing of the radiation in the far field. Inhomogeneities of the radiation of the light-emitting diode module are advantageously thereby largely compensated.
  • the entrance slit 9 and the exit surface 10 are each formed aspherical.
  • Such a shape of the lens 2 makes it possible to correct aberrations, since the entry surfaces 9 and the exit surfaces 10 of the lenses 2 are freely selectable. Due to the independently formed aspherical entry surfaces 9 and exit surfaces 10, a certain entrance angle of the be emitted from the light emitting diodes 1 emitted radiation to a certain exit angle. As a result, a predetermined exit angle of the radiation from the lens 2, thus a predetermined angular distribution of the radiation after passing through the lens 2 and thus substantially a predetermined bundling of the radiation after passing through the lens 2 take place.
  • the angular distribution of the radiation after passing through the lenses 2 has a full half width of less than 80 °. Furthermore, structures and radiation hotspots of the LEDs 1 can be largely eliminated by the downstream lens array, so that the emitted radiation of the light-emitting diode module has a uniform light distribution.
  • the distances between the LEDs 1 and the entry surfaces 9 of the lenses 2 of the lens array are preferably smaller than the focal length of the lenses 2. Because the LEDs 1 are not arranged in the focal points of the individual lenses 2, but as close as possible to the lenses 2, the concave entrance surface 9 of the lenses 2 focuses on the respective radiation of the individual light emitting diodes 1.
  • the close arrangement of the light emitting diodes on the lenses also has the advantage that structures and color gradients of the light emitting diodes are imperceptible to a viewer. A homogeneous light distribution of the emitted radiation in the color locus of white light is obtained.
  • the light-emitting diodes 1 are preferably designed as thin-film light-emitting diodes.
  • a thin-film light-emitting diode is, to a good approximation, a Lambert surface radiator.
  • the exemplary embodiment of a light-emitting diode module illustrated in FIG. 2 differs from the light-emitting diode module of FIG . 1 in that the two lenses 2 partially penetrate one another. This means that the lenses 2 of the lens array partially overlap.
  • the lens array is preferably formed in one piece. It thus represents a coherent, one-piece component. This has the advantage that in the manufacture of the light-emitting diode module with a plurality of LEDs 1 exactly one coherent and integrally formed lens array can be produced. This lowers the production time and production costs. Furthermore, the stability of the lens array increases and it facilitates the manufacture of the lens array by means of an injection molding process.
  • the light-emitting diodes 1 are arranged on a substrate 12, on which also the lens array is applied.
  • the substrate 12 preferably contains Al or Cu.
  • the substrate 12 may be formed as an injection-molded circuit carrier, as a DBC substrate or as a printed circuit board.
  • the lens array is preferably applied and attached to the substrate 12 by gluing, hot caulking or snap hooks. Alternatively, a combination of assembly techniques is possible.
  • the substrate 12 may have recesses in which the light emitting diodes 1 are arranged (not shown).
  • the recesses preferably serve as reflectors for the radiation emitted by the light-emitting diodes 1.
  • the light-emitting diodes 1 can each be arranged individually in a depression of the substrate 12. This reduces the fraction of the radiation emitted by a light-emitting diode 1 that can be absorbed by the other light-emitting diodes 1. This improves the light output of the LED module.
  • the LEDs 1, which are arranged in front of a respective lens 2 may be arranged together in a recess of the substrate 12.
  • the exemplary embodiment illustrated in FIG. 3 differs from the exemplary embodiments illustrated in FIG. 1 or in FIG. 2 in that the lens array is formed from four lenses 2.
  • the four lenses 2 are arranged rotationally symmetrical to one another.
  • the optical axes of the four lenses 2 lie on vertices of an imaginary rectangle, preferably on vertices of an imaginary square.
  • each lens 2 In front of each lens 2, exactly four LEDs 1 are arranged, which are arranged rotationally symmetrical about the respective optical axis of the respective lens 2.
  • One light emitting diode 1 emits radiation in the red spectral range
  • two light emitting diodes 1 emit radiation in the green spectral range
  • another light emitting diode 1 emits radiation in the blue spectral range (“RGGB LEDs").
  • the radiation emitted by the light emitting diodes 1 is bundled by the lenses 2 of the lens array such that an angular distribution of the radiation after passing through the Lenses 2 has a full width at half maximum of less than 80 °.
  • the radiation exits the lens array as collimated radiation 4. Due to the rotationally symmetrical arrangement of the lenses 2 in combination with the rotationally symmetrical arrangement of the light-emitting diodes 1, an improved color mixing in the far field can preferably be achieved. Inhomogeneities of the emitted radiation 4 of the module, which would arise without the symmetrical arrangement of the light-emitting diodes 1, are compensated by this rotationally symmetrical arrangement of the LEDs 1.
  • the bottom of the embodiment shown in Figure 3 is shown.
  • the arrangement of the light-emitting diodes 1 differ for each of the four lenses 2.
  • the arrangement of the light-emitting diodes 1 of a lens is rotated by 90 ° in comparison to the arrangement of the light-emitting diodes 1 of an adjacent lens.
  • This special arrangement of the LEDs 1 in conjunction with the symmetrical arrangement of the lenses 2 of the lens array allows improved color mixing in the near and far field. Inhomogeneities of the radiation emitted by the light-emitting diode module are largely avoided or compensated.
  • a Fresnel lens 6 is arranged downstream of the lens array in comparison with the preceding exemplary embodiments.
  • the Fresnel lens 6 bundles the already bundled by the lens array radiation 4 in a smaller angular range.
  • inhomogeneities of the radiation of the light-emitting diode module can be advantageously continued compensate.
  • the color mixing in the far field continues to improve.
  • the Fresnel lens 6 has an exit side of the radiation onto which outcoupling structures 7 are applied. As a result, the decoupling properties of the Fresnel lens 6 are improved, as a result of which the homogeneity of the radiation and good color mixing of the radiation in the far field of the light-emitting diode module can be achieved.
  • the Fresnel lens 6 is followed by a honeycomb condenser 8 having entrance lenses and exit lenses.
  • the honeycomb condenser 4 ensures good color and brightness homogeneity in the far field and no color shadows in the case of the radiation 4 focused by the lens array and the Fresnel lens 6. Without a downstream honeycomb condenser 8, color shadows would result in the radiation emitted by the light emitting diode module.
  • An arrangement with integrated honeycomb condenser 8 is preferably applicable, for example, in the case of backlighting or as spotlighting.
  • the exit lenses of the honeycomb condenser 8 are preferably arranged in the focal point of the entrance lenses.
  • the entrance lenses have a greater curvature than the exit lenses. This achieves improved color and brightness homogeneity in the far field and the absence of color shadows.
  • the exit lenses and the entrance lenses of the honeycomb condenser each have optical axes (not shown).
  • the optical Axes of the entrance lenses with respect to the optical axes of the exit lenses laterally shifted.
  • the exit lenses may be displaced in the direction of the entrance lenses. This results in a blurring of the image in the far field, whereby an improved homogeneity in the far field can be achieved.
  • the Fresnel lens 6 and the honeycomb condenser 8 are preferably cylindrical.
  • the diameter of the Fresnel lens 6 and the honeycomb condenser 8 is preferably between 40 mm and 120 mm, in the exemplary embodiment of FIG. 5 50 mm.
  • the exemplary embodiment of a light-emitting diode module illustrated in FIG. 6 represents a perspective view of the exemplary embodiment illustrated in FIG. 5.
  • a sensor 13 is arranged centrally between the four lenses of the lens array. The sensor determines values for the brightness and the color locus of the radiation impinging on the Fresnel lens 6.
  • the light-emitting diodes 1 can be controlled individually, for example. Alternatively, it is possible that the light-emitting diodes 1 are arranged in groups of a plurality of light-emitting diodes 1, which are connected, for example, in series with one another and thus can be driven together.
  • the current can be controlled by certain light-emitting diodes 1 such that the light-emitting diode module emits radiation of a specific color locus. This preferably results in an exact, reproducible setting of the color location. For example, if a light-emitting diode 1 of lesser brightness is located on the light-emitting diode module, this light-emitting diode 1 can be energized more strongly than other light-emitting diodes 1 of the module. Is the Color location of a first light emitting diode 1 shifted to the color location of a second light emitting diode 1, so the current through the second light emitting diode 1 can be reduced.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Led Device Packages (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un module à diodes électroluminescentes contenant un réseau de plusieurs lentilles (2) conçue chacune de façon à présenter une symétrie de révolution autour d'un axe optique (3) respectif. Chaque lentille (2) présente une surface d'entrée (9) concave et une surface de sortie (10) convexe. Au moins trois diodes électroluminescentes (1) sont placées en amont de chaque lentille. Une diode électroluminescente (1) émet dans le rouge, une deuxième dans le vert et une troisième dans le bleu ("DEL-RVB"). Le mélange des couleurs du rayonnement émis par le module à diodes électroluminescentes est amélioré dans la zone de Fraunhofer.
PCT/DE2008/001450 2007-09-11 2008-09-02 Module à diodes électroluminescentes WO2009033454A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007043192A DE102007043192A1 (de) 2007-09-11 2007-09-11 Leuchtdioden-Modul
DE102007043192.0 2007-09-11

Publications (1)

Publication Number Publication Date
WO2009033454A1 true WO2009033454A1 (fr) 2009-03-19

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PCT/DE2008/001450 WO2009033454A1 (fr) 2007-09-11 2008-09-02 Module à diodes électroluminescentes

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DE (1) DE102007043192A1 (fr)
WO (1) WO2009033454A1 (fr)

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CN103748407A (zh) * 2011-08-21 2014-04-23 业纳聚合物系统有限公司 带有包括菲涅耳透镜和呈蜂窝状布置的非球面透镜的透镜系统的led灯
US8757849B2 (en) 2007-11-23 2014-06-24 Osram Gesellschaft Mit Beschrankter Haftung Optical component and illumination device

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JP5457219B2 (ja) * 2010-02-16 2014-04-02 株式会社小糸製作所 光学ユニット
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