EP1696171A1 - LED display device - Google Patents

LED display device Download PDF

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Publication number
EP1696171A1
EP1696171A1 EP06003202A EP06003202A EP1696171A1 EP 1696171 A1 EP1696171 A1 EP 1696171A1 EP 06003202 A EP06003202 A EP 06003202A EP 06003202 A EP06003202 A EP 06003202A EP 1696171 A1 EP1696171 A1 EP 1696171A1
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EP
European Patent Office
Prior art keywords
display device
lens array
led display
leds
lenses
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.)
Granted
Application number
EP06003202A
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German (de)
French (fr)
Other versions
EP1696171B1 (en
Inventor
Mario Wanninger
Matthias Hofer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors GmbH
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Publication of EP1696171A1 publication Critical patent/EP1696171A1/en
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Classifications

    • 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
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • 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
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/02—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for roads, paths or the like
    • 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]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights

Definitions

  • the invention relates to an LED display device according to the preamble of patent claim 1.
  • LED arrays are characterized by a high luminance with comparatively low power consumption, a long service life, a fast response time and a comparatively low sensitivity to shocks and vibrations. For this reason, LED arrays are particularly suitable for reproducing static or moving images in large-format display devices, for example video displays, information panels for road traffic or variable message signs.
  • a light information system in which to reduce the phantom light a Arrangement of a plurality of fins is provided, wherein the lamellae extend substantially parallel to the beam direction of the radiation emitted by the light source.
  • the radiation should be made substantially forward and downward while light emitted upward is uselessly lost.
  • the invention has for its object to provide an improved LED display device, which is characterized in particular by an advantageous suppression of phantom light, an anisotropic emission characteristics and high mechanical stability.
  • An LED display device with a plurality of LEDs and a first lens array, which contains a plurality of lenses for collimating and / or focusing the radiation emitted by the LEDs comprises a second lens array of a plurality of lenses, which follows the first lens array in a radiation direction of the LEDs wherein a lens of the first lens array is associated with each lens of the second lens array, and wherein the lens of the first lens array each has an optical axis offset from an optical axis of the associated lens of the second lens array, and an aperture array interposed between the first lens array and the second lens array is arranged.
  • the inventive arrangement of the first lens array, the second lens array and the diaphragm arrangement advantageously both a suppression of phantom light and a beam shaping of the useful radiation emitted by the plurality of LEDs is achieved.
  • the display device includes, for example, a matrix-like arrangement of LEDs. Each LED represents a pixel of the display device.
  • the LEDs may comprise one or more radiation-emitting semiconductor chips.
  • the LED display device may be a full-color display, in which the LEDs comprise, for example, at least one semiconductor chip emitting in the red, one in the green and one in the blue spectral region.
  • the LEDs of the display device may also each containing one or more monochrome light or white light emitting semiconductor chips.
  • the LED display device is advantageously composed of a multiplicity of individual modules, each module comprising a certain number of LEDs.
  • a single module may comprise a matrix array of 8 x 8 LEDs.
  • the modular design of the LED display device assembly and service are advantageously simplified.
  • a defect within a single module can be remedied by replacing the respective module.
  • each LED of the display device is assigned in each case a lens of the first lens array and a lens of the second lens array.
  • the number of lenses of the first lens array and the second lens array in this case is equal to the number of pixels of the LED display device, respectively.
  • the second lens array is a transparent cover of the display device.
  • the lenses of the second lens array thus advantageously constitute an outer cover facing the viewer of the display device.
  • the lenses of the second lens array are preferably curved on the side facing away from the LEDs. This is particularly advantageous when the second lens array is a transparent outer cover of the LED display device. Due to the curvature of the outwardly facing surfaces of the lenses of the second lens array is a specular reflection of interfering extraneous light, the otherwise especially with a planar windshield can be pronounced, effectively reduced.
  • the lenses of the second lens array are particularly preferably designed in such a way that ambient light impinging on the display device from the outside, such as sunlight, for example, is deflected substantially onto light-absorbing regions of the diaphragm arrangement. In this way, a reduction in contrast of the display or even a glare of a viewer by reflected extraneous light is advantageously reduced.
  • the diaphragm arrangement is preferably aligned perpendicular to a main radiation direction of the LEDs.
  • the diaphragm arrangement is a structured disk.
  • the diaphragm arrangement has a planar structure and can be positioned between the lens arrays with comparatively little production effort.
  • the first lens array and the second lens array may each be spaced from the aperture array by a honeycomb spacer.
  • the LEDs are advantageously spaced from the first lens array by a honeycomb spacer.
  • the honeycomb spacers are advantageously made of a blackened plastic.
  • the diaphragm arrangement is advantageously formed from a blackened plastic.
  • the use of plastic is particularly advantageous for large-area displays, since in this way the weight of the display device can be reduced.
  • metal parts can alternatively be used, which are preferably blackened to improve the absorption of extraneous light.
  • the diaphragm arrangement may be a structured thin metal sheet.
  • the first lens array and the second lens array are advantageously made of a plastic.
  • the lens arrays can be produced with a comparatively low production outlay by means of an injection molding process. In addition to the relatively low production cost, this has the advantage that the weight of the LED display device is reduced compared to the use of glass lens arrays.
  • the LED display device preferably has a main emission direction that is not parallel to a main emission direction of the individual LEDs.
  • the emission characteristic of the LED display device is thus not symmetrical with respect to the main emission direction of the LEDs.
  • Such an asymmetrical emission characteristic is particularly advantageous for change traffic displays.
  • radiation into the traffic space is usually required downwards or forwards, since upwardly emitted radiation could not be perceived by a road user who views the display.
  • the efficiency of the light emission is advantageously improved.
  • the asymmetrical emission characteristic is advantageously achieved in that the optical axis of a lens of the first lens array in each case with respect to the optical axis of associated lens of the second lens array is arranged offset in the direction of the main emission of the LED display device.
  • the optical axes of the lenses of the second lens array are offset downwardly relative to the optical axes of the lenses of the first lens array from the position of a viewer of the display device.
  • the radiation collimated and / or focused by the lenses of the first lens array strikes the lenses of the second lens array in this embodiment at least predominantly above the optical axis of the lenses of the second lens array.
  • the lenses of the second lens array are preferably converging lenses that deflect light incident outside the optical axis toward the optical axis.
  • the LEDs of the display device are preferably surface mount LEDs.
  • the LEDs can be mounted on a mounting surface, for example a PCB (Printed Circuit Board), in an automated process.
  • the assembly cost is advantageously low compared to wired LEDs, which are usually mounted manually.
  • the distance between adjacent LEDs is preferably 12 mm or less, for example 10 mm to 12 mm. As a result, a comparatively high image resolution is achieved for large-area display devices, in particular traffic signal systems.
  • the lenses of the first lens array advantageously have a TIR (Total Internal Reflection) structure on an LED-facing side.
  • TIR Total Internal Reflection
  • Such TIR lenses are known for example from WO00 / 24062 and are therefore not explained in detail at this point.
  • the lenses of the second lens array are advantageously aspherically curved.
  • the lenses of the second lens array may have an elliptical shape.
  • the LED display device comprises LEDs arranged on a carrier body, the first lens array, the second lens array, the diaphragm arrangement, honeycomb spacers between the LEDs and the first lens array and between the diaphragm arrangement and the lens arrays, as well as further housing parts, for example metal sheets and seals.
  • the LED display device is advantageously constructed substantially in a mechanical sandwich construction, i. the aforementioned components are layered on top of each other. The assembly and adjustment effort is advantageously low. With this design, a corresponding rigidity and resistance to temperature and wind pressure is further achieved, so that the LED display device is particularly suitable for use in outdoor areas, such as for change traffic announcements.
  • the LED display device shown in Figure 1 includes a plurality of LEDs 2, which are mounted on a common carrier 1, for example, a PCB (Printed Circuit Board).
  • the LEDs 2 are preferably surface mount LEDs and each form one pixel of the LED display device. To simplify the illustration, only three pixels of the LED display device are shown in FIG. Of course, further pixels can connect in a vertical direction parallel to the drawing plane of FIG. 1 as well as in a horizontal direction perpendicular to the drawing plane of FIG.
  • the LEDs 2 each contain one or more radiation-emitting semiconductor chips (not shown). For example, each LED 2 contains three radiation-emitting semiconductor chips which emit light in the three primary colors red, green and blue.
  • the radiation emitted by the LEDs 2 is focused by a first lens array 3 containing a plurality of TIR lenses 4.
  • the LED display device has a second lens array 5, which contains a plurality of lenses 6 and follows the first lens array 3 in a main beam direction 7 of the LEDs 2.
  • the optical axes 8 of the lenses 4 of the first lens array 3 are parallel to the main beam direction 7 of the LEDs 2.
  • the optical axes 9 of the lenses 6 of the second lens array 5 are offset from the optical axes 8 of the lenses 4 of the first lens array 3.
  • the light emitted in the main beam direction 7 of the LEDs 2 therefore strikes a large part beyond the optical axis 9 on the lenses 6 of the second lens array 5. This causes the light emitted by the LEDs 2 radiation 10 from the lenses 6 of the second lens array 5 in one Main beam direction 11 is deflected, which is not parallel to the main beam direction 7 of the LEDs 2.
  • the optical axes 9 of the lenses 6 are advantageously offset from the optical axes 8 of the lenses 4 in a direction from which the LED display device is preferably viewed.
  • the optical axes 9 of the lenses 6 of the second LED array 5 are opposite to the optical axis 8 of the lenses 4 of the first LED array 3 in FIG offset vertically downwards.
  • the aperture assembly 12 is preferably in the form of a disk containing absorbent regions 13 and apertures 14 disposed therebetween. Instead of openings 14, alternatively, transparent regions may also be provided, in particular of a transparent plastic.
  • the absorbent areas 13 of the panel assembly 12 are preferably formed of a black plastic or metal.
  • External light 15 incident from outside on the LED display device is advantageously deflected by the lenses 6 of the second lens array 5 onto the absorbing regions 13 of the diaphragm arrangement 12. In this way it is achieved that the contrast of the LED display device is not reduced by reflected toward a viewer extraneous light (phantom light).
  • the suppression of the phantom light is further improved in the LED display device in that the second lens array 5 constitutes an outer cover of the LED display device in which the occurrence of specular reflections by the convexly outwardly curved lenses 6 is reduced.
  • the lenses 6 advantageously have an aspherical curvature, in particular an elliptical curvature.
  • a spacer 16, 17, 18 is advantageously provided between the carrier 1 and the first lens array 3, between the first lens array 3 and the diaphragm assembly 12, as well as between the diaphragm assembly 12 and the second lens array 5, a spacer 16, 17, 18 is advantageously provided.
  • the spacers 16, 17, 18 are structured, for example, in honeycomb or matrix form, wherein each honeycomb or matrix cell comprises one pixel of the LED display device. Of course, this structure does not necessarily have to be hexagonal honeycomb.
  • the spacers 16, 17, 18 and the lens arrays 3, 5 are preferably each plastic parts produced by injection molding. Furthermore, the diaphragm arrangement 12 may be a plastic disc produced by injection molding.
  • the distance between adjacent LEDs 2 of the LED display device is preferably 12 mm or less. In this way, a comparatively high image resolution is achieved for large-area display devices.
  • the manufacturing cost is comparatively low in the LED display device according to the invention by the comparatively simple mechanical construction, in which the spacers 16, 17, 18, the lens arrays 3, 5 and the diaphragm assembly 12 are stacked on top of each other, comparatively low. It is particularly advantageous that the optical relevant parts, in particular the lens arrays 3, 5 and the diaphragm assembly 12 are each formed as arrays, so that a complex assembly of the LED display device with individual optical components that would have to be adjusted individually to each other is not required.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Led Device Packages (AREA)
  • Control Of El Displays (AREA)

Abstract

The device has several LEDs (2), and a lens array (3), which comprises several lenses (4) for collimating and/or focusing of the radiation emitted by the LEDs. Another lens array (5) having lenses (6) follows the array (3) in an emitted direction of the LEDs. The lens (4) exhibits an optical axis, which is arranged opposite to an optical axis of the lens (6). A screen arrangement (12) is arranged between the two lens arrays.

Description

Die Erfindung betrifft eine LED-Anzeigevorrichtung nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an LED display device according to the preamble of patent claim 1.

Diese Patentanmeldung beansprucht die Priorität der deutschen Patentanmeldung 10 2005 009 058.3, deren Offenbarungsgehalt hiermit durch Rückbezug aufgenommen wird.This patent application claims the priority of German Patent Application 10 2005 009 058.3, the disclosure of which is hereby incorporated by reference.

LED-Arrays zeichnen sich durch eine hohe Leuchtdichte bei vergleichsweise geringem Stromverbrauch, eine hohe Lebensdauer, eine schnelle Ansprechzeit und eine vergleichsweise geringe Empfindlichkeit gegen Stöße und Vibrationen aus. LED-Arrays sind aus diesem Grund insbesondere zur Wiedergabe statischer oder bewegter Bilder in großformatigen Anzeigevorrichtungen, beispielsweise Video-Anzeigen, Informationstafeln für den Straßenverkehr oder Wechselverkehrszeichen, geeignet.LED arrays are characterized by a high luminance with comparatively low power consumption, a long service life, a fast response time and a comparatively low sensitivity to shocks and vibrations. For this reason, LED arrays are particularly suitable for reproducing static or moving images in large-format display devices, for example video displays, information panels for road traffic or variable message signs.

Bei derartigen Anzeigevorrichtungen besteht oftmals das Problem, dass der Kontrast der Bildwiedergabe durch von außen auftreffendes Fremdlicht vermindert wird. Dies kann insbesondere dazu führen, dass Wechselverkehrszeichen oder Informationstafeln für den Straßenverkehr, beispielsweise bei tiefstehender Sonne, erst spät oder sogar gar nicht wahrgenommen werden können. Das von der Anzeigevorrichtung reflektierte Fremdlicht wird üblicherweise als Phantomlicht bezeichnet.In such display devices, there is often the problem that the contrast of the image reproduction is reduced by extraneous light impinging from the outside. This can in particular mean that variable traffic signs or information panels for road traffic, for example, in low sun, late or even can not be perceived. The extraneous light reflected by the display device is commonly referred to as phantom light.

Aus der DE 30 22 737 C2 ist eine Lichtinformationsanlage bekannt, bei der zur Verminderung des Phantomlichts eine Anordnung aus einer Vielzahl von Lamellen vorgesehen ist, wobei die Lamellen im wesentlichen parallel zur Strahlrichtung der von der Lichtquelle emittierten Strahlung verlaufen. Durch eine derartige Lamellenanordnung kann beispielsweise bei einer Verkehrsampel die Reflexion von schräg auftreffendem Sonnenlicht vermindert werden.From DE 30 22 737 C2, a light information system is known in which to reduce the phantom light a Arrangement of a plurality of fins is provided, wherein the lamellae extend substantially parallel to the beam direction of the radiation emitted by the light source. By means of such a lamellar arrangement, for example in the case of a traffic light, the reflection of obliquely incident sunlight can be reduced.

Für großflächige Anzeigen, beispielsweise Verkehrszeichen oder Informationstafeln, sind solche Lamellenanordnungen allerdings nicht ohne weiteres geeignet, da eine ausreichende Stabilität gegen Witterungseinflüsse, insbesondere Wind und Feuchtigkeit, nur schwer zu erzielen ist. Zudem ist die Herstellung großflächiger Lamellenanordnungen vergleichsweise aufwendig.For large-scale displays, such as traffic signs or information boards, such lamellar arrangements, however, are not readily suitable, since a sufficient stability against weathering, especially wind and moisture, is difficult to achieve. In addition, the production of large-area fin arrangements is comparatively expensive.

Neben einer Unterdrückung des Phantomlichts ist es bei großflächigen Anzeigevorrichtungen oftmals wünschenswert, anstelle einer isotropen Abstrahlung eine asymmetrische Abstrahlung in vertikaler Richtung zu erzielen. Beispielsweise soll bei Anzeigevorrichtungen für Verkehrssignale die Abstrahlung im wesentlichen nach vorn und unten erfolgen, während nach oben abgestrahltes Licht nutzlos verloren geht.In addition to suppression of the phantom light, it is often desirable for large area display devices to achieve asymmetric radiation in the vertical direction rather than isotropic radiation. For example, in traffic signal display devices, the radiation should be made substantially forward and downward while light emitted upward is uselessly lost.

Der Erfindung liegt die Aufgabe zugrunde, eine verbesserte LED-Anzeigevorrichtung anzugeben, die sich insbesondere durch eine vorteilhafte Unterdrückung von Phantomlicht, eine anisotrope Abstrahlcharakteristik und eine hohe mechanische Stabilität auszeichnet.The invention has for its object to provide an improved LED display device, which is characterized in particular by an advantageous suppression of phantom light, an anisotropic emission characteristics and high mechanical stability.

Diese Aufgabe wird durch eine LED-Anzeigevorrichtung mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.This object is achieved by an LED display device having the features of patent claim 1. advantageous Embodiments and developments of the invention are the subject of the dependent claims.

Eine LED-Anzeigevorrichtung mit mehreren LEDs und einem ersten Linsenarray, das mehrere Linsen zur Kollimierung und/oder Fokussierung der von den LEDs emittierten Strahlung enthält, umfasst gemäß der Erfindung ein zweites Linsenarray aus mehreren Linsen, das in einer Abstrahlrichtung der LEDs dem ersten Linsenarray nachfolgt, wobei einer Linse des ersten Linsenarrays jeweils eine Linse des zweiten Linsenarrays zugeordnet ist, und wobei die Linse des ersten Linsenarrays jeweils eine optische Achse aufweist, die gegenüber einer optischen Achse der zugeordneten Linse des zweiten Linsenarrays versetzt angeordnet ist, und eine Blendenanordnung, die zwischen dem ersten Linsenarray und dem zweiten Linsenarray angeordnet ist.An LED display device with a plurality of LEDs and a first lens array, which contains a plurality of lenses for collimating and / or focusing the radiation emitted by the LEDs, according to the invention comprises a second lens array of a plurality of lenses, which follows the first lens array in a radiation direction of the LEDs wherein a lens of the first lens array is associated with each lens of the second lens array, and wherein the lens of the first lens array each has an optical axis offset from an optical axis of the associated lens of the second lens array, and an aperture array interposed between the first lens array and the second lens array is arranged.

Durch die erfindungsgemäße Anordnung des ersten Linsenarrays, des zweiten Linsenarrays und der Blendenanordnung wird vorteilhaft sowohl eine Unterdrückung von Phantomlicht als auch eine Strahlformung der von den mehreren LEDs emittierten Nutzstrahlung erzielt.The inventive arrangement of the first lens array, the second lens array and the diaphragm arrangement advantageously both a suppression of phantom light and a beam shaping of the useful radiation emitted by the plurality of LEDs is achieved.

Die Anzeigevorrichtung enthält beispielsweise eine matrixartige Anordnung von LEDs. Jede LED stellt dabei ein Pixel der Anzeigevorrichtung dar. Die LEDs können einen oder mehrere strahlungsemittierende Halbleiterchips umfassen. Insbesondere kann die LED-Anzeigevorrichtung ein Vollfarb-Display sein, bei dem die LEDs zum Beispiel jeweils mindestens einen im roten, einen im grünen und einen im blauen Spektralbereich emittierenden Halbleiterchip umfassen. Alternativ können die LEDs der Anzeigevorrichtung auch jeweils eine oder mehrere monochromes Licht oder Weißlicht emittierende Halbleiterchips enthalten.The display device includes, for example, a matrix-like arrangement of LEDs. Each LED represents a pixel of the display device. The LEDs may comprise one or more radiation-emitting semiconductor chips. In particular, the LED display device may be a full-color display, in which the LEDs comprise, for example, at least one semiconductor chip emitting in the red, one in the green and one in the blue spectral region. Alternatively, the LEDs of the display device may also each containing one or more monochrome light or white light emitting semiconductor chips.

Die LED-Anzeigevorrichtung ist vorteilhaft aus einer Vielzahl einzelner Module, wobei jedes Modul eine gewisse Anzahl LEDs umfasst, zusammengesetzt. Beispielsweise kann ein einzelnes Modul eine matrixförmige Anordnung von 8 x 8 LEDs umfassen. Durch den modularen Aufbau der LED-Anzeigevorrichtung werden Montage und Service vorteilhaft vereinfacht. Insbesondere kann bei dieser Ausführungsform ein Defekt innerhalb eines einzelnen Moduls durch den Austausch des jeweiligen Moduls behoben werden.The LED display device is advantageously composed of a multiplicity of individual modules, each module comprising a certain number of LEDs. For example, a single module may comprise a matrix array of 8 x 8 LEDs. The modular design of the LED display device assembly and service are advantageously simplified. In particular, in this embodiment, a defect within a single module can be remedied by replacing the respective module.

Bevorzugt ist jeder LED der Anzeigevorrichtung jeweils eine Linse des ersten Linsenarrays und eine Linse des zweiten Linsenarrays zugeordnet. Die Anzahl der Linsen des ersten Linsenarrays und des zweiten Linsenarrays ist in diesem Fall jeweils gleich der Anzahl der Pixel der LED-Anzeigevorrichtung.Preferably, each LED of the display device is assigned in each case a lens of the first lens array and a lens of the second lens array. The number of lenses of the first lens array and the second lens array in this case is equal to the number of pixels of the LED display device, respectively.

Bei einer bevorzugten Ausführungsform ist das zweite Linsenarray eine transparente Abdeckung der Anzeigevorrichtung. Die Linsen des zweiten Linsenarrays stellen so vorteilhaft eine dem Betrachter der Anzeigevorrichtung zugewandte Außenabdeckung dar.In a preferred embodiment, the second lens array is a transparent cover of the display device. The lenses of the second lens array thus advantageously constitute an outer cover facing the viewer of the display device.

Die Linsen des zweiten Linsenarrays sind vorzugsweise auf der von den LEDs abgewandten Seite gekrümmt. Dies ist insbesondere dann vorteilhaft, wenn das zweite Linsenarray eine transparente Außenabdeckung der LED-Anzeigevorrichtung darstellt. Durch die Krümmung der nach außen gewandten Oberflächen der Linsen des zweiten Linsenarrays wird eine spekuläre Reflexion von störendem Fremdlicht, die ansonsten insbesondere bei einer planaren Frontscheibe stark ausgeprägt sein kann, wirkungsvoll vermindert.The lenses of the second lens array are preferably curved on the side facing away from the LEDs. This is particularly advantageous when the second lens array is a transparent outer cover of the LED display device. Due to the curvature of the outwardly facing surfaces of the lenses of the second lens array is a specular reflection of interfering extraneous light, the otherwise especially with a planar windshield can be pronounced, effectively reduced.

Besonders bevorzugt sind die Linsen des zweiten Linsenarrays derart ausgebildet, dass von außen auf die Anzeigevorrichtung auftreffendes Fremdlicht, wie zum Beispiel Sonnenlicht, im wesentlichen auf lichtabsorbierende Bereiche der Blendenanordnung umgelenkt wird. Auf diese Weise wird eine Kontrastminderung der Anzeige oder sogar eine Blendung eines Betrachters durch reflektiertes Fremdlicht vorteilhaft vermindert.The lenses of the second lens array are particularly preferably designed in such a way that ambient light impinging on the display device from the outside, such as sunlight, for example, is deflected substantially onto light-absorbing regions of the diaphragm arrangement. In this way, a reduction in contrast of the display or even a glare of a viewer by reflected extraneous light is advantageously reduced.

Die Blendenanordnung ist bevorzugt senkrecht zu einer Hauptstrahlrichtung der LEDs ausgerichtet.The diaphragm arrangement is preferably aligned perpendicular to a main radiation direction of the LEDs.

Vorteilhaft ist die Blendenanordnung eine strukturierte Scheibe. Bei dieser Ausführungsform weist die Blendenanordnung ei planare Struktur auf und kann mit vergleichsweise geringem Herstellungsaufwand zwischen den Linsenarrays positioniert werden. Beispielsweise können das erste Linsenarray und das zweite Linsenarray jeweils durch einen wabenförmigen Abstandshalter von der Blendenanordnung beabstandet sein. Ebenfalls sind die LEDs mit Vorteil durch einen wabenförmigen Abstandshalter von dem ersten Linsenarray beabstandet.Advantageously, the diaphragm arrangement is a structured disk. In this embodiment, the diaphragm arrangement has a planar structure and can be positioned between the lens arrays with comparatively little production effort. For example, the first lens array and the second lens array may each be spaced from the aperture array by a honeycomb spacer. Also, the LEDs are advantageously spaced from the first lens array by a honeycomb spacer.

Die wabenförmigen Abstandshalter sind vorteilhaft aus einem geschwärzten Kunststoff hergestellt. Weiterhin ist auch die Blendenanordnung vorteilhaft aus einem geschwärzten Kunststoff gebildet. Die Verwendung von Kunststoff ist insbesondere für großflächige Anzeigen vorteilhaft, da auf diese Weise das Gewicht der Anzeigevorrichtung reduziert werden kann. Falls eine größere mechanische Steifigkeit erforderlich ist, können alternativ auch Metallteile verwendet werden, die bevorzugt zur Verbesserung der Absorption von Fremdlicht geschwärzt sind. Beispielsweise kann die Blendenanordnung ein strukturiertes dünnes Metallblech sein.The honeycomb spacers are advantageously made of a blackened plastic. Furthermore, the diaphragm arrangement is advantageously formed from a blackened plastic. The use of plastic is particularly advantageous for large-area displays, since in this way the weight of the display device can be reduced. If greater mechanical rigidity is required, metal parts can alternatively be used, which are preferably blackened to improve the absorption of extraneous light. For example, the diaphragm arrangement may be a structured thin metal sheet.

Das erste Linsenarray und das zweite Linsenarray sind vorteilhaft aus einem Kunststoff hergestellt. Insbesondere können die Linsenarrays mit einem vergleichsweise geringen Herstellungsaufwand mittels einem Spritzgussverfahren hergestellt werden. Neben dem vergleichsweise geringen Herstellungsaufwand hat dies den Vorteil, dass das Gewicht der LED-Anzeigevorrichtung im Vergleich zur Verwendung von Linsenarrays aus Glas vermindert wird.The first lens array and the second lens array are advantageously made of a plastic. In particular, the lens arrays can be produced with a comparatively low production outlay by means of an injection molding process. In addition to the relatively low production cost, this has the advantage that the weight of the LED display device is reduced compared to the use of glass lens arrays.

Die LED-Anzeigevorrichtung weist vorzugsweise eine Hauptabstrahlrichtung auf, die zu einer Hauptabstrahlrichtung der einzelnen LEDs nicht parallel ist. Die Abstrahlcharakteristik der LED-Anzeigevorrichtung ist somit nicht symmetrisch in bezug auf die Hauptabstrahlrichtung der LEDs. Eine derartige asymmetrische Abstrahlcharakteristik ist insbesondere vorteilhaft für Wechselverkehrsanzeigen. Bei dieser Anwendung von LED-Anzeigevorrichtungen ist in der Regel eine Abstrahlung in den Verkehrsraum nach unten beziehungsweise nach vorne gefordert, da nach oben emittierte Strahlung von einem Verkehrsteilnehmer, der die Anzeige betrachtet, nicht wahrgenommen werden könnte. Durch eine asymmetrische Abstrahlcharakteristik wird also vorteilhaft die Effizienz der Lichtabstrahlung verbessert.The LED display device preferably has a main emission direction that is not parallel to a main emission direction of the individual LEDs. The emission characteristic of the LED display device is thus not symmetrical with respect to the main emission direction of the LEDs. Such an asymmetrical emission characteristic is particularly advantageous for change traffic displays. In this application of LED display devices radiation into the traffic space is usually required downwards or forwards, since upwardly emitted radiation could not be perceived by a road user who views the display. As a result of an asymmetrical emission characteristic, the efficiency of the light emission is advantageously improved.

Die asymmetrische Abstrahlcharakteristik wird vorteilhaft dadurch erzielt, dass die optische Achse einer Linse des ersten Linsenarrays jeweils gegenüber der optischen Achse der zugeordneten Linse des zweiten Linsenarrays in Richtung der Hauptabstrahlrichtung der LED-Anzeigevorrichtung versetzt angeordnet ist. Beispielsweise sind die optischen Achsen der Linsen des zweiten Linsenarrays gegenüber den optischen Achsen der Linsen des ersten Linsenarrays von der Position eines Betrachters der Anzeigevorrichtung aus gesehen nach unten versetzt. Die von den Linsen des ersten Linsenarrays kollimierte und/oder fokussierte Strahlung trifft bei dieser Ausführungsform zumindest überwiegend oberhalb der optischen Achse der Linsen des zweiten Linsenarrays auf die Linsen des zweiten Linsenarrays. Die Linsen des zweiten Linsenarrays sind bevorzugt Sammellinsen, die außerhalb der optischen Achse auftreffendes Licht zur optischen Achse hin ablenken.The asymmetrical emission characteristic is advantageously achieved in that the optical axis of a lens of the first lens array in each case with respect to the optical axis of associated lens of the second lens array is arranged offset in the direction of the main emission of the LED display device. For example, the optical axes of the lenses of the second lens array are offset downwardly relative to the optical axes of the lenses of the first lens array from the position of a viewer of the display device. The radiation collimated and / or focused by the lenses of the first lens array strikes the lenses of the second lens array in this embodiment at least predominantly above the optical axis of the lenses of the second lens array. The lenses of the second lens array are preferably converging lenses that deflect light incident outside the optical axis toward the optical axis.

Die LEDs der Anzeigevorrichtung sind vorzugsweise oberflächenmontierbare LEDs. Die LEDs können in diesem Fall in einem automatisierten Verfahren auf eine Montagefläche, beispielsweise ein PCB (Printed Circuit Board) montiert werden. Der Bestückungsaufwand ist dabei im Vergleich zu bedrahteten LEDs, die üblicherweise manuell montiert werden, vorteilhaft gering. Der Abstand zwischen benachbarten LEDs beträgt vorzugsweise 12 mm oder weniger, zum Beispiel 10 mm bis 12 mm. Dadurch wird eine für großflächige Anzeigevorrichtungen, insbesondere Verkehrssignalanlagen, vergleichsweise hohe Bildauflösung erzielt.The LEDs of the display device are preferably surface mount LEDs. In this case, the LEDs can be mounted on a mounting surface, for example a PCB (Printed Circuit Board), in an automated process. The assembly cost is advantageously low compared to wired LEDs, which are usually mounted manually. The distance between adjacent LEDs is preferably 12 mm or less, for example 10 mm to 12 mm. As a result, a comparatively high image resolution is achieved for large-area display devices, in particular traffic signal systems.

Die Linsen des ersten Linsenarrays weisen vorteilhaft auf einer den LEDs zugewandten Seite eine TIR (Total Internal Reflection)-Struktur auf. Derartige TIR-Linsen sind beispielsweise aus der WO00/24062 bekannt und werden daher an dieser Stelle nicht näher erläutert.The lenses of the first lens array advantageously have a TIR (Total Internal Reflection) structure on an LED-facing side. Such TIR lenses are known for example from WO00 / 24062 and are therefore not explained in detail at this point.

Die Linsen des zweiten Linsenarrays sind vorteilhaft asphärisch gekrümmt. Insbesondere können die Linsen des zweiten Linsenarrays eine elliptische Form aufweisen.The lenses of the second lens array are advantageously aspherically curved. In particular, the lenses of the second lens array may have an elliptical shape.

Bei einer bevorzugten Ausführungsform umfasst die LED-Anzeigevorrichtung auf einem Trägerkörper angeordnete LEDs, das erste Linsenarray, das zweite Linsenarray, die Blendenanordnung, wabenförmige Abstandshalter zwischen den LEDs und dem ersten Linsenarray sowie zwischen der Blendenanordnung und den Linsenarrays, sowie weitere Gehäuseteile, beispielsweise Metallbleche und Dichtungen. Die LED-Anzeigevorrichtung ist vorteilhaft im wesentlichen in einer mechanischen Sandwichbauweise aufgebaut, d.h. die zuvor genannten Komponenten sind schichtartig aufeinander angeordnet. Der Montage- und Justage-Aufwand ist dabei vorteilhaft gering. Mit dieser Bauweise wird weiterhin eine entsprechende Steifigkeit und Beständigkeit gegenüber Temperatur und Winddruck erzielt, so dass die LED-Anzeigevorrichtung insbesondere für den Einsatz in Außenbereichen geeignet ist, beispielsweise für Wechselverkehrsanzeigen.In a preferred embodiment, the LED display device comprises LEDs arranged on a carrier body, the first lens array, the second lens array, the diaphragm arrangement, honeycomb spacers between the LEDs and the first lens array and between the diaphragm arrangement and the lens arrays, as well as further housing parts, for example metal sheets and seals. The LED display device is advantageously constructed substantially in a mechanical sandwich construction, i. the aforementioned components are layered on top of each other. The assembly and adjustment effort is advantageously low. With this design, a corresponding rigidity and resistance to temperature and wind pressure is further achieved, so that the LED display device is particularly suitable for use in outdoor areas, such as for change traffic announcements.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels im Zusammenhang mit der Figur 1 näher erläutert.

Figur 1
zeigt eine schematische Darstellung eines Querschnitts durch eine LED-Anzeigevorrichtung gemäß einem Ausführungsbeispiel der Erfindung.
The invention will be explained in more detail below with reference to an embodiment in conjunction with FIG.
FIG. 1
shows a schematic representation of a cross section through an LED display device according to an embodiment of the invention.

Gleiche oder gleichwirkende Elemente sind in der Figur mit den gleichen Bezugszeichen versehen.Same or equivalent elements are provided in the figure with the same reference numerals.

Die in Figur 1 dargestellte LED-Anzeigevorrichtung enthält mehrere LEDs 2, die auf einem gemeinsamen Träger 1, beispielsweise ein PCB (Printed Circuit Board) montiert sind. Die LEDs 2 sind vorzugsweise oberflächenmontierbare LEDs und bilden jeweils ein Pixel der LED-Anzeigevorrichtung aus. Zur Vereinfachung der Darstellung sind in der Figur 1 nur drei Pixel der LED-Anzeigevorrichtung dargestellt. Selbstverständlich können sich sowohl in einer vertikalen Richtung parallel zur Zeichenebene der Figur 1 als auch in einer horizontalen Richtung senkrecht zur Zeichenebene der Figur 1 weitere Pixel anschließen.
Die LEDs 2 enthalten jeweils einen oder mehrere strahlungsemittierende Halbleiterchips (nicht dargestellt). Beispielsweise enthält jede LED 2 drei strahlungsemittierende Halbleiterchips, die Licht in den drei Grundfarben Rot, Grün und Blau emittieren.The LED display device shown in Figure 1 includes a plurality of LEDs 2, which are mounted on a common carrier 1, for example, a PCB (Printed Circuit Board). The LEDs 2 are preferably surface mount LEDs and each form one pixel of the LED display device. To simplify the illustration, only three pixels of the LED display device are shown in FIG. Of course, further pixels can connect in a vertical direction parallel to the drawing plane of FIG. 1 as well as in a horizontal direction perpendicular to the drawing plane of FIG.
The LEDs 2 each contain one or more radiation-emitting semiconductor chips (not shown). For example, each LED 2 contains three radiation-emitting semiconductor chips which emit light in the three primary colors red, green and blue.

Die von den LEDs 2 emittierte Strahlung wird durch ein erstes Linsensarray 3, das mehrere TIR-Linsen 4 enthält, fokussiert.The radiation emitted by the LEDs 2 is focused by a first lens array 3 containing a plurality of TIR lenses 4.

Weiterhin weist die LED-Anzeigevorrichtung ein zweites Linsenarray 5 auf, das mehrere Linsen 6 enthält und dem ersten Linsenarray 3 in einer Hauptstrahlrichtung 7 der LEDs 2 nachfolgt. Die optischen Achsen 8 der Linsen 4 des ersten Linsenarrays 3 verlaufen parallel zur Hauptstrahlrichtung 7 der LEDs 2. Die optischen Achsen 9 der Linsen 6 des zweiten Linsenarrays 5 sind gegenüber den optischen Achsen 8 der Linsen 4 des ersten Linsenarrays 3 versetzt angeordnet. Das in der Hauptstrahlrichtung 7 emittierte Licht der LEDs 2 trifft daher zu einem großen Teil jenseits der optischen Achse 9 auf die Linsen 6 des zweiten Linsenarrays 5. Dadurch wird bewirkt, dass die von den LEDs 2 emittierte Strahlung 10 von den Linsen 6 des zweiten Linsenarrays 5 in eine Hauptstrahlrichtung 11 umgelenkt wird, die nicht parallel zur Hauptstrahlrichtung 7 der LEDs 2 ist.Furthermore, the LED display device has a second lens array 5, which contains a plurality of lenses 6 and follows the first lens array 3 in a main beam direction 7 of the LEDs 2. The optical axes 8 of the lenses 4 of the first lens array 3 are parallel to the main beam direction 7 of the LEDs 2. The optical axes 9 of the lenses 6 of the second lens array 5 are offset from the optical axes 8 of the lenses 4 of the first lens array 3. The light emitted in the main beam direction 7 of the LEDs 2 therefore strikes a large part beyond the optical axis 9 on the lenses 6 of the second lens array 5. This causes the light emitted by the LEDs 2 radiation 10 from the lenses 6 of the second lens array 5 in one Main beam direction 11 is deflected, which is not parallel to the main beam direction 7 of the LEDs 2.

Die optischen Achsen 9 der Linsen 6 sind vorteilhaft gegenüber den optischen Achsen 8 der Linsen 4 in einer Richtung versetzt angeordnet, aus der die LED-Anzeigevorrichtung vorzugsweise betrachtet wird. Wird die LED-Anzeigevorrichtung beispielsweise bevorzugt von einer Position betrachtet, die sich unterhalb der LED-Anzeigevorrichtung befindet, sind die optischen Achsen 9 der Linsen 6 des zweiten LED-Arrays 5 gegenüber den optischen Achse 8 der Linsen 4 des ersten LED-Arrays 3 in vertikaler Richtung nach unten versetzt angeordnet.The optical axes 9 of the lenses 6 are advantageously offset from the optical axes 8 of the lenses 4 in a direction from which the LED display device is preferably viewed. For example, when the LED display device is preferably viewed from a position located below the LED display device, the optical axes 9 of the lenses 6 of the second LED array 5 are opposite to the optical axis 8 of the lenses 4 of the first LED array 3 in FIG offset vertically downwards.

Zwischen dem ersten Linsenarray 3 und dem zweiten Linsenarray 5 ist eine Blendenanordnung 12 enthalten. Die Blendenanordnung 12 ist bevorzugt in Form einer Scheibe ausgeführt, die absorbierende Bereiche 13 und dazwischen angeordnete Öffnungen 14 enthält. Anstelle von Öffnungen 14 können alternativ auch transparente Bereiche vorgesehen sein, insbesondere aus einem transparenten Kunststoff. Die absorbierenden Bereiche 13 der Blendenanordnung 12 sind vorzugsweise aus einem schwarzen Kunststoff oder Metall gebildet. Von außen auf die LED-Anzeigevorrichtung auftreffendes Fremdlicht 15 wird vorteilhaft durch die Linsen 6 des zweiten Linsenarrays 5 auf die absorbierenden Bereiche 13 der Blendenanordnung 12 umgelenkt. Auf diese Weise wird erreicht, dass der Kontrast der LED-Anzeigevorrichtung nicht durch in Richtung eines Betrachters reflektiertes Fremdlicht (Phantomlicht) vermindert wird. Die Unterdrückung des Phantomlichts wird bei der LED-Anzeigevorrichtung weiterhin dadurch verbessert, dass das zweite Linsenarray 5 eine Außenabdeckung der LED-Anzeigevorrichtung darstellt, bei der das Auftreten spekulärer Reflexe durch die konvex nach außen gekrümmten Linsen 6 vermindert wird. Die Linsen 6 weisen dazu vorteilhaft eine asphärische Krümmung, insbesondere eine elliptische Krümmung, auf.Between the first lens array 3 and the second lens array 5, a diaphragm assembly 12 is included. The aperture assembly 12 is preferably in the form of a disk containing absorbent regions 13 and apertures 14 disposed therebetween. Instead of openings 14, alternatively, transparent regions may also be provided, in particular of a transparent plastic. The absorbent areas 13 of the panel assembly 12 are preferably formed of a black plastic or metal. External light 15 incident from outside on the LED display device is advantageously deflected by the lenses 6 of the second lens array 5 onto the absorbing regions 13 of the diaphragm arrangement 12. In this way it is achieved that the contrast of the LED display device is not reduced by reflected toward a viewer extraneous light (phantom light). The suppression of the phantom light is further improved in the LED display device in that the second lens array 5 constitutes an outer cover of the LED display device in which the occurrence of specular reflections by the convexly outwardly curved lenses 6 is reduced. The lenses 6 advantageously have an aspherical curvature, in particular an elliptical curvature.

Zwischen dem Träger 1 und dem ersten Linsenarray 3, zwischen dem ersten Linsenarray 3 und der Blendenanordnung 12, sowie zwischen der Blendenanordnung 12 und dem zweiten Linsenarray 5 ist vorteilhaft jeweils ein Abstandshalter 16, 17, 18 vorgesehen. Die Abstandshalter 16, 17, 18 sind beispielsweise waben- oder matrixförmig strukturiert, wobei jede Wabe oder Matrixzelle ein Pixel der LED-Anzeigevorrichtung umfasst. Selbstverständliche muss es sich bei dieser Struktur nicht notwendigerweise um sechseckige Waben handeln.Between the carrier 1 and the first lens array 3, between the first lens array 3 and the diaphragm assembly 12, as well as between the diaphragm assembly 12 and the second lens array 5, a spacer 16, 17, 18 is advantageously provided. The spacers 16, 17, 18 are structured, for example, in honeycomb or matrix form, wherein each honeycomb or matrix cell comprises one pixel of the LED display device. Of course, this structure does not necessarily have to be hexagonal honeycomb.

Die Abstandshalter 16, 17, 18 sowie die Linsenarrays 3, 5 sind vorzugsweise jeweils im Spritzgussverfahren hergestellte Kunststoffteile. Weiterhin kann auch die Blendenanordnung 12 eine im Spritzgussverfahren hergestellte Kunststoffscheibe sein.The spacers 16, 17, 18 and the lens arrays 3, 5 are preferably each plastic parts produced by injection molding. Furthermore, the diaphragm arrangement 12 may be a plastic disc produced by injection molding.

Der Abstand zwischen benachbarten LEDs 2 der LED-Anzeigevorrichtung beträgt vorzugsweise 12 mm oder weniger. Auf diese Weise wird eine für großflächige Anzeigevorrichtungen vergleichsweise hohe Bildauflösung erzielt.The distance between adjacent LEDs 2 of the LED display device is preferably 12 mm or less. In this way, a comparatively high image resolution is achieved for large-area display devices.

Der Herstellungsaufwand ist bei der LED-Anzeigevorrichtung gemäß der Erfindung durch die vergleichsweise einfache mechanische Konstruktion, bei der die Abstandshalter 16, 17, 18, die Linsenarrays 3, 5 und die Blendenanordnung 12 schichtartig aufeinander gestapelt sind, vergleichsweise gering. Besonders vorteilhaft ist, dass die optisch relevanten Teile, insbesondere die Linsenarrays 3, 5 und die Blendenanordnung 12 jeweils als Arrays ausgebildet sind, so dass eine aufwendige Bestückung der LED-Anzeigevorrichtung mit einzelnen optischen Komponenten, die einzeln zu einander justiert werden müssten, nicht erforderlich ist.The manufacturing cost is comparatively low in the LED display device according to the invention by the comparatively simple mechanical construction, in which the spacers 16, 17, 18, the lens arrays 3, 5 and the diaphragm assembly 12 are stacked on top of each other, comparatively low. It is particularly advantageous that the optical relevant parts, in particular the lens arrays 3, 5 and the diaphragm assembly 12 are each formed as arrays, so that a complex assembly of the LED display device with individual optical components that would have to be adjusted individually to each other is not required.

Die Erfindung ist nicht durch die Beschreibung anhand der Ausführungsbeispiele beschränkt. Vielmehr umfasst die Erfindung jedes neue Merkmal sowie jede Kombination von Merkmalen, was insbesondere jede Kombination von Merkmalen in den Patentansprüchen beinhaltet, auch wenn dieses Merkmal oder diese Kombination selbst nicht explizit in den Patentansprüchen oder Ausführungsbeispielen angegeben ist.The invention is not limited by the description with reference to the embodiments. Rather, the invention encompasses any novel feature as well as any combination of features, including in particular any combination of features in the claims, even if this feature or combination itself is not explicitly stated in the patent claims or exemplary embodiments.

Claims (16)

LED-Anzeigevorrichtung mit mehreren LEDs (2) und einem ersten Linsenarray (3), das mehrere Linsen (4) zur Kollimierung und/oder Fokussierung der von den LEDs (2) emittierten Strahlung umfasst,
dadurch gekennzeichnet, dass
die Anzeigevorrichtung umfasst: - ein zweites Linsenarray (5) aus mehreren Linsen (6), das in einer Abstrahlrichtung (7) der LEDs (2) dem ersten Linsenarray (3) nachfolgt, wobei einer Linse (4) des ersten Linsenarrays (3) jeweils eine Linse (6) des zweiten Linsenarrays (5) zugeordnet ist, und wobei die Linse (4) des ersten Linsenarrays (3) jeweils eine optische Achse (8) aufweist, die gegenüber einer optischen Achse (9) der zugeordneten Linse (6) des zweiten Linsenarrays (5) versetzt angeordnet ist, und - eine Blendenanordnung (12), die zwischen dem ersten Linsenarray (3) und dem zweiten Linsenarray (5) angeordnet ist. LED display device with a plurality of LEDs (2) and a first lens array (3) comprising a plurality of lenses (4) for collimating and / or focusing the radiation emitted by the LEDs (2),
characterized in that
the display device comprises: a second lens array (5) comprising a plurality of lenses (6) which follows the first lens array (3) in a radiation direction (7) of the LEDs (2), one lens (4) of the first lens array (3) each having a lens ( 6) of the second lens array (5) is associated, and wherein the lens (4) of the first lens array (3) each having an optical axis (8), with respect to an optical axis (9) of the associated lens (6) of the second lens array (5) is arranged offset, and - An aperture arrangement (12) which is arranged between the first lens array (3) and the second lens array (5). LED-Anzeigevorrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass
das zweite Linsenarray (5) eine transparente Abdeckung der Anzeigevorrichtung ist.LED display device according to claim 1,
characterized in that
the second lens array (5) is a transparent cover of the display device. LED-Anzeigevorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass
die Linsen (6) des zweiten Linsenarrays (5) auf der von den LEDs (2) abgewandten Seite konvex gekrümmt sind.LED display device according to claim 1 or 2,
characterized in that
the lenses (6) of the second lens array (5) are convexly curved on the side facing away from the LEDs (2). LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Linsen (6) des zweiten Linsenarrays (5) asphärisch gekrümmt sind.LED display device according to one of the preceding claims,
characterized in that
the lenses (6) of the second lens array (5) are aspherically curved. LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Linsen (6) des zweiten Linsenarrays (5) derart ausgebildet sind, dass von außen auf die Anzeigevorrichtung auftreffendes Fremdlicht (15) im wesentlichen auf absorbierende Bereiche (13) der Blendenanordnung (12) umgelenkt wird.LED display device according to one of the preceding claims,
characterized in that
the lenses (6) of the second lens array (5) are designed in such a way that extraneous light (15) impinging on the display device from outside is deflected substantially onto absorbing areas (13) of the diaphragm arrangement (12). LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Linsen (4) des ersten Linsenarrays (3) auf der den LEDs (2) zugewandten Seite eine TIR-Struktur aufweisen.LED display device according to one of the preceding claims,
characterized in that
the lenses (4) of the first lens array (3) have a TIR structure on the side facing the LEDs (2). LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Blendenanordnung (12) senkrecht zu einer Hauptstrahlrichtung (7) der LEDs (2) ausgerichtet ist.LED display device according to one of the preceding claims,
characterized in that
the diaphragm arrangement (12) is aligned perpendicular to a main radiation direction (7) of the LEDs (2). LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Blendenanordnung (12) eine strukturierte Scheibe ist.LED display device according to one of the preceding claims,
characterized in that
the diaphragm arrangement (12) is a structured disk. LED-Anzeigevorrichtung nach Anspruch 8,
dadurch gekennzeichnet, dass
die Scheibe aus einem geschwärzten Kunststoff gebildet ist.LED display device according to claim 8,
characterized in that
the disc is formed from a blackened plastic is. LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die LED-Anzeigevorrichtung eine Hauptabstrahlrichtung (11) aufweist, die zu einer Hauptabstrahlrichtung (7) der LEDs (2) nicht parallel ist.LED display device according to one of the preceding claims,
characterized in that
the LED display device has a main emission direction (11) which is not parallel to a main emission direction (7) of the LEDs (2). LED-Anzeigevorrichtung nach Anspruch 10,
dadurch gekennzeichnet, dass
die optischen Achsen (8) der Linsen (4) des ersten Linsenarrays (3) gegenüber den optische Achsen (9) der zugeordneten Linsen (6) des zweiten Linsenarrays (5) in Richtung der Hauptabstrahlrichtung (11) der LED-Anzeigevorrichtung versetzt sind.LED display device according to claim 10,
characterized in that
the optical axes (8) of the lenses (4) of the first lens array (3) are offset from the optical axes (9) of the associated lenses (6) of the second lens array (5) in the direction of the main emission direction (11) of the LED display device. LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
dass erste Linsenarray (3) und das zweite Linsenarray (5) in einem Spritzgussverfahren aus einem Kunststoff hergestellt sind.LED display device according to one of the preceding claims,
characterized in that
in that the first lens array (3) and the second lens array (5) are made of a plastic in an injection molding process. LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die LEDs (2) oberflächenmontierbare LEDs sind.LED display device according to one of the preceding claims,
characterized in that
the LEDs (2) are surface mounted LEDs. LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Anzeigevorrichtung eine matrixartige Anordnung von LEDs (2) enthält, wobei jede LED (2) einen oder mehrere strahlungsemittierende Halbleiterchips umfasst.LED display device according to one of the preceding claims,
characterized in that
the display device is a matrix-like arrangement of LEDs (2), each LED (2) comprising one or more radiation-emitting semiconductor chips. LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
jeder LED (2) der Anzeigevorrichtung jeweils eine Linse (4) des ersten Linsenarrays (3) und eine Linse (6) des zweiten Linsenarrays (5) zugeordnet ist.LED display device according to one of the preceding claims,
characterized in that
Each LED (2) of the display device is associated with a respective lens (4) of the first lens array (3) and a lens (6) of the second lens array (5). LED-Anzeigevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
der Abstand zwischen benachbarten LEDs (2) 12 mm oder weniger beträgt.LED display device according to one of the preceding claims,
characterized in that
the distance between adjacent LEDs (2) is 12 mm or less.
EP06003202A 2005-02-28 2006-02-16 LED display device Not-in-force EP1696171B1 (en)

Applications Claiming Priority (1)

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DE102005009058 2005-02-28

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EP (1) EP1696171B1 (en)
AT (1) ATE481600T1 (en)
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WO2008102339A1 (en) * 2007-02-20 2008-08-28 Camtek Ltd. Led illumination for line scan camera
DE102007040573A1 (en) * 2007-08-28 2009-03-05 Christian Bartenbach lighting device
EP2184530A2 (en) * 2008-11-10 2010-05-12 Hyundai Telecommunication Co., Ltd. LED lighting device
CN101182904B (en) * 2007-11-30 2010-06-09 中国计量学院 Traffic signal light taking high power LED as light source high power LED
EP2226780A1 (en) * 2009-03-02 2010-09-08 Textmate Limited A highway electronic display
WO2011031170A1 (en) * 2009-09-09 2011-03-17 Instytut Optyki Stosowanej Light distribution array optical system
WO2011117217A1 (en) * 2010-03-24 2011-09-29 Siemens Aktiengesellschaft Optical display element and display device
WO2010150149A3 (en) * 2009-06-25 2011-12-01 Koninklijke Philips Electronics N.V. Multi-beam illumination system and method of illumination
CN102770896A (en) * 2010-02-24 2012-11-07 西门子公司 Symbol indicator
EP2860719A1 (en) * 2013-10-10 2015-04-15 Ortana Elektronik Yazilim Taah. San. ve Tic. A.S. Providing information using an optical element
CN105605484A (en) * 2016-01-29 2016-05-25 欧普照明股份有限公司 Backlight lamp
WO2021083800A1 (en) * 2019-10-28 2021-05-06 Signify Holding B.V. Lighting device for providing a sparkling appearance

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EP0930600A1 (en) * 1998-01-19 1999-07-21 SWARCO FUTURIT Verkehrssignalsysteme Ges.m.b.H. Optical element comprising LED and two lenses for the generation of pointlike light sources for traffic signs and display panels
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Cited By (26)

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Publication number Priority date Publication date Assignee Title
WO2008102339A1 (en) * 2007-02-20 2008-08-28 Camtek Ltd. Led illumination for line scan camera
CN101675330B (en) * 2007-02-20 2013-01-02 卡姆特有限公司 Led illumination for line scan camera
DE102007040573A1 (en) * 2007-08-28 2009-03-05 Christian Bartenbach lighting device
CN101182904B (en) * 2007-11-30 2010-06-09 中国计量学院 Traffic signal light taking high power LED as light source high power LED
EP2184530A3 (en) * 2008-11-10 2012-04-25 Hyundai Telecommunication Co., Ltd. LED lighting device
EP2184530A2 (en) * 2008-11-10 2010-05-12 Hyundai Telecommunication Co., Ltd. LED lighting device
EP2226780A1 (en) * 2009-03-02 2010-09-08 Textmate Limited A highway electronic display
CN102668696B (en) * 2009-06-25 2016-01-20 皇家飞利浦电子股份有限公司 Multiple beam irradiation system and illuminating method
WO2010150149A3 (en) * 2009-06-25 2011-12-01 Koninklijke Philips Electronics N.V. Multi-beam illumination system and method of illumination
CN102668696A (en) * 2009-06-25 2012-09-12 皇家飞利浦电子股份有限公司 Multi-beam illumination system and method of illumination
US8783904B2 (en) 2009-06-25 2014-07-22 Koninklijke Philips N.V. Multi-beam illumination system and method of illumination
WO2011031170A1 (en) * 2009-09-09 2011-03-17 Instytut Optyki Stosowanej Light distribution array optical system
CN102770896A (en) * 2010-02-24 2012-11-07 西门子公司 Symbol indicator
CN102770896B (en) * 2010-02-24 2015-11-25 西门子公司 Symbol display
US9171488B2 (en) 2010-03-24 2015-10-27 Siemens Aktiengesellschaft Optical display element and display device
RU2546486C2 (en) * 2010-03-24 2015-04-10 Сименс Акциенгезелльшафт Optical display element and display device
WO2011117217A1 (en) * 2010-03-24 2011-09-29 Siemens Aktiengesellschaft Optical display element and display device
CN102812507A (en) * 2010-03-24 2012-12-05 西门子公司 Optical display element and display device
CN102812507B (en) * 2010-03-24 2016-04-13 西门子公司 Optics indicating device and indicating equipment
EP2860719A1 (en) * 2013-10-10 2015-04-15 Ortana Elektronik Yazilim Taah. San. ve Tic. A.S. Providing information using an optical element
US9443452B2 (en) 2013-10-10 2016-09-13 Ortana Elektronik Yazilim Taah. San. ve Tic. A.S. Providing information using an optical element
EP3267427A1 (en) * 2013-10-10 2018-01-10 Ortana Elektronik Yazilim Taah. San. ve Tic. A.S. Optical element for an information system for displaying information
CN105605484A (en) * 2016-01-29 2016-05-25 欧普照明股份有限公司 Backlight lamp
CN105605484B (en) * 2016-01-29 2024-02-23 欧普照明股份有限公司 Backlight lamp
WO2021083800A1 (en) * 2019-10-28 2021-05-06 Signify Holding B.V. Lighting device for providing a sparkling appearance
US11821608B2 (en) 2019-10-28 2023-11-21 Signify Holding B.V. Lighting device having light-transmissive cover layer between a lens array and a light source array

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DE502006007871D1 (en) 2010-10-28
ATE481600T1 (en) 2010-10-15

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