DE102005017206A1 - LED module for head up display of vehicle, has color LED, which sends spectral centroid and is arranged in direct proximity to white light LED, where symmetry in terms of axis or point is produced between each white light LED and color LED - Google Patents

LED module for head up display of vehicle, has color LED, which sends spectral centroid and is arranged in direct proximity to white light LED, where symmetry in terms of axis or point is produced between each white light LED and color LED Download PDF

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Publication number
DE102005017206A1
DE102005017206A1 DE102005017206A DE102005017206A DE102005017206A1 DE 102005017206 A1 DE102005017206 A1 DE 102005017206A1 DE 102005017206 A DE102005017206 A DE 102005017206A DE 102005017206 A DE102005017206 A DE 102005017206A DE 102005017206 A1 DE102005017206 A1 DE 102005017206A1
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Germany
Prior art keywords
led
white light
color
leds
symmetry
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Ceased
Application number
DE102005017206A
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German (de)
Inventor
Dirk Jahn
Bryce Anton Dr. Moffat
Artur Dr. Degen
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Jenoptik AG
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Carl Zeiss Jena GmbH
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Priority to DE102005017206A priority Critical patent/DE102005017206A1/en
Publication of DE102005017206A1 publication Critical patent/DE102005017206A1/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • G09F9/302—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 characterised by the form or geometrical disposition of the individual elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/12—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
    • 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]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

The module has matrix-shaped white light-LEDs (2), which are arranged in a distributed manner on a surface. A color LED with same spectral centroid is arranged at the side of each white light LED. The color LED sends a spectral centroid and is arranged in direct proximity to the white light LED. A symmetry (6) is produced between each white light LED and the color LED, in terms of axis or a point.

Description

Die Erfindung betrifft ein LED-Modul zur Beleuchtung eines Objektes welches eine Vielzahl von Weißlicht-LEDs und Farb-LEDs aufweist. Das LED-Modul dient insbesondere der Beleuchtung eines Bildgebers für ein Head Up Display (HUD), zum Beispiel für Fahrzeuge. Von der Beleuchtung wird gefordert, daß diese vollfarbtauglich ist und sowohl im Abstrahlwinkel, als auch im Feld homogen ist. Weiterhin ist es wichtig, daß die Beleuchtung kompakt ist, um in den vorhandenen Bauraum eines Kraftfahrzeuges zu passen.The The invention relates to an LED module for illuminating an object which has a variety of white light LEDs and color LEDs. The LED module is used in particular for lighting of an imager for a Head Up Display (HUD), for example for vehicles. From the lighting is required that this is fully color suitable and both in the beam angle, as well as in the field is homogeneous. Furthermore, it is important that the lighting is compact to fit in the existing space of a motor vehicle.

In DE 100 16 817 A1 wird ein HUD mit einer Vielzahl von roten, blauen und grünen Leuchtdioden (LED) beschrieben, bei dem das Licht einer Lichtquelle durch eine lichtdurchlässige Anzeige (Bildgeber) gesendet und auf eine Scheibe projiziert wird. Die Leuchtdioden werden ohne Verpackung eingesetzt und deren Spektrum soll für die Transmission des Bildgeber angepaßt sein.In DE 100 16 817 A1 describes a HUD with a plurality of red, blue and green light-emitting diodes (LEDs) in which the light from a light source is transmitted through a translucent display (imager) and projected onto a pane. The LEDs are used without packaging and their spectrum should be adapted for the transmission of the imager.

In der Praxis aber ist es bisher nicht gelungen eine effiziente, in Feld und Winkel homogene Beleuchtung mit 3-Farben LED zu realisieren. Das Problem verschärft sich durch die Anforderung von Kompaktheit an die Anordnung.In In practice, however, it has not yet succeeded in an efficient, in Field and angle to realize homogeneous illumination with 3-color LED. The problem is aggravated by the requirement of compactness to the arrangement.

In der DE 102 16 394 B3 wird ein LED-Modul beschrieben, welches eine Mehrzahl von Weißlicht-LEDs und mindestens jeweils eine von vier weiteren LEDs hat. Die mindestens vier weiteren LEDs haben jeweils eine andere Zentralwellenlänge. Die LEDs sind einzeln elektronisch ansteuerbar, wodurch die spektrale Zusammensetzung des ausgesendeten Lichtes in weiten Grenzen variiert werden kann.In the DE 102 16 394 B3 an LED module is described which has a plurality of white light LEDs and at least one of four further LEDs. The at least four further LEDs each have a different central wavelength. The LEDs are individually electronically controllable, whereby the spectral composition of the emitted light can be varied within wide limits.

Die Aufgabe der Erfindung ist es, eine flächenhafte Anordnung von LEDs zu schaffen, mit der eine homogene Ausleuchtung eines Objektes, insbesondere eines Bildgebers erreicht werden kann.The The object of the invention is an areal arrangement of LEDs to create, with the homogeneous illumination of an object, in particular an imager can be achieved.

Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Hauptanspruchs 1 gelöst. Die Unteransprüche 2 bis 5 sind vorteilhafte Ausgestaltungen des Hauptanspruches.The The object is achieved by the characterizing features of the main claim 1 solved. The under claims 2 to 5 are advantageous embodiments of the main claim.

Auf dem LED-Modul sind mehrere Weißlicht-LEDs matrixförmig auf einer Fläche verteilt angeordnet und mindestens je eine Farb-LED, die eine Schwerpunktwellenlänge aussendet, ist in unmittelbarer Nähe zu jeder der Weißlicht-LEDs angeordnet ist. Dabei ist wesentlich, daß eine Symmetrie zwischen jeder Weißlicht-LED und der mindestens einen Farb-LED hergestellt ist. Diese Symmetrie kann bezüglich einer oder mehrerer Achsen vorliegen oder auch auf einen Punkt bezogen sein. Vorzugsweise ist ein Symmetriepunkt der Zentrumspunkt der Kombination Weißlicht-LED und Farb-LED. So wird sicher gestellt, daß die Lichtanteile gut verteilt werden.On The LED module has several white light LEDs in matrix form on an area arranged distributed and at least one color LED each, which emits a center of gravity wavelength, is in the immediate vicinity to each of the white light LEDs is arranged. It is essential that a symmetry between each White LED and the at least one color LED is made. This symmetry can respect one or more axes or even related to one point be. Preferably, a point of symmetry is the center point of Combination white light LED and color LED. This ensures that the light components are well distributed become.

Zur Anpassung an das gewünschte Spektrum wird das Licht jeder Weislicht-LED mit dem Licht der mindestens einen Farb-LED gemischt. Durch die unmittelbare Zuordnung der Lichtquellen mit dem unterschiedlichen Wellenlängenspektrum wird eine große Homogenität des Spektrums über die gesamte Fläche des LED-Moduls erreicht. Durch nachgeschaltete strahlformende und homogenisierende optische Bauelemente oder Baugruppen wird eine weitere Verbesserung der Homogenität der Lichtverteilung eines ausgeleuchteten Objektes erzielt.to Adaptation to the desired Spectrum becomes the light of every white light LED with the light of at least one Mixed color LED. Due to the direct assignment of the light sources with the different wavelength spectrum, a large homogeneity of the spectrum over the the whole area of the LED module reached. By downstream jet-forming and homogenizing optical components or assemblies becomes a further improvement of the homogeneity of the light distribution of a achieved illuminated object.

Die Fläche des LED-Moduls hat vorzugsweise die Form eines Rechteckes, welches der Größe des Bildgebers entspricht. Zwischen jedem LED-Modul und dem Bildgeber ist vorzugsweise eine Homogenisierungs- und/oder Kollimationsoptik vorgeschaltet.The area the LED module preferably has the shape of a rectangle, which the size of the imager equivalent. Between each LED module and the imager is preferably a Homogenisierungs- and / or Kollimationsoptik upstream.

Die Erfindung wird nachfolgend an Hand von Figuren beschrieben. Es zeigen:The The invention will be described below with reference to figures. Show it:

1: LED-Modul nach dem Stand der Technik 1 : LED module according to the prior art

2: Modul mit Weißlicht-LEDs 2 : Module with white light LEDs

3: Modul mit Weißlicht-LEDs mit jeweils einer zugeordneten Farb-LED 3 : Module with white light LEDs, each with an associated color LED

4: Modul mit Weißlicht-LEDs mit jeweils vier zugeordneten Farb-LED 4 : Module with white light LEDs, each with four associated color LEDs

5: Modul mit Weißlicht-LEDs mit jeweils neun zugeordneten Farb-LED 5 : Module with white light LEDs each with nine associated color LEDs

6: Modul mit Weißlicht-LEDs mit jeweils vier zugeordneten Farb-LED 6 : Module with white light LEDs, each with four associated color LEDs

Die 1 zeigt ein LED-Modul nach der DE 100 16 817 A1 . LEDs 3, 4, 5, welche die Farben Rot, Grün und Blau abstrahlen, sind matrixförmig verteilt auf einer näherungsweise kreisförmigen Fläche dicht aneinander angeordnet.The 1 shows an LED module after the DE 100 16 817 A1 , LEDs 3 . 4 . 5 , which emit the colors red, green and blue, are distributed in a matrix-like manner on an approximately circular surface close to each other.

2 zeigt ein LED-Modul 1 mit Weißlicht-LEDs 2, welches eine rechteckförmige Form aufweist. Die einzelnen Weißlicht-LEDs 2 haben vorzugsweise einen Abstand voneinander, der größer ist als ein Querschnitt der Weißlicht-LED 2. 2 shows an LED module 1 with white light LEDs 2 which has a rectangular shape. The individual white light LEDs 2 preferably have a distance from each other which is greater than a cross section of the white light LED 2 ,

3 zeigt ein LED-Modul 1 mit Weißlicht-LEDs 2 mit jeweils einer zugeordneten Farb-LED 4 gemäß der Erfindung. Im Beispiel wird jede Weißlicht-LED 2 mit einer grün abstrahlenden Farb-LED 4 kombiniert. Dabei ist die grüne Farb-LED 4 neben der Fläche der Weißlicht-LED 2 angeordnet. Die Anordnung der LED ist bezüglich einer Achse 6 symmetrisch. Die Anordnung der Farb-LED 4 kann aber auch innerhalb der Fläche der Weißlicht-LED 2 erfolgen, wie dies in 6 beispielhaft gezeigt ist. 3 shows an LED module 1 with white light LEDs 2 each with an associated color LED 4 according to the invention. In the example, each white light LED 2 with a green emitting color LED 4 combined. Here is the green color LED 4 next to the surface of the white light LED 2 arranged. The arrangement of the LED is with respect to an axis 6 symmetrical. The arrangement of the color LED 4 but also within the area of the white light LED 2 done as in 6 is shown by way of example.

4 zeigt ein LED-Modul 1 mit Weißlicht-LEDs 2 mit jeweils vier zugeordneten Farb-LEDs 3, 4, 5. Im Beispiel wird jede Weißlicht LED mit zwei grün abstrahlenden Farb-LEDs 4, einer blau abstrahlenden Farb-LED 5 und einer rot abstrahlenden Farb-LED 3 kombiniert. Die Anordnung der LED ist bezüglich einer Achse 6 symmetrisch. 4 shows an LED module 1 with white light LEDs 2 each with four associated color LEDs 3 . 4 . 5 , In the example, each white light LED comes with two green emitting color LEDs 4 , a blue emitting color LED 5 and a red emitting color LED 3 combined. The arrangement of the LED is with respect to an axis 6 symmetrical.

5 zeigt ein LED-Modul 1 mit Weißlicht-LEDs 2 mit jeweils neun zugeordneten Farb-LEDs 3, 4, 5. Im Beispiel wird jede Weißlicht-LED 2 mit vier grün abstrahlenden Farb-LEDs 4, einer blau abstrahlenden Farb-LED 5 und vier rot abstrahlenden Farb-LED 3 kombiniert. Die Farb-LEDs 3, 4, 5 sind in diesem Beispiel in die Fläche der Weißlicht-LED 2 eingebracht, so daß die Weißlicht-LED 2 aus vier gleichen Teilen zusammengesetzt ist. 5 shows an LED module 1 with white light LEDs 2 each with nine associated color LEDs 3 . 4 . 5 , In the example, each white light LED 2 with four green emitting color LEDs 4 , a blue emitting color LED 5 and four red emitting color LEDs 3 combined. The color LEDs 3 . 4 . 5 are in this example in the area of the white light LED 2 introduced so that the white light LED 2 composed of four equal parts.

6 zeigt ein weiteres LED-Modul 1 mit Weißlicht-LEDs 2 mit jeweils vier zugeordneten Farb-LEDs 4, 5, bei dem die Farb-LEDs 4, 5 innerhalb der Fläche der Weißlicht-LED 2 angeordnet sind. In dieser Figur sind eine Punktsymmetrie 6 und eine Achssymmetrie 6 dargestellt. 6 shows another LED module 1 with white light LEDs 2 each with four associated color LEDs 4 . 5 in which the color LEDs 4 . 5 within the area of the white light LED 2 are arranged. In this figure, a point symmetry 6 and an axis symmetry 6 shown.

11
Modulmodule
22
Weißlicht-LEDWhite LED
33
Rot strahlende Farb-LEDred bright color LED
44
Grün strahlende Farb-LEDGreen radiant Color LED
55
Blau strahlende Farb-LEDblue bright color LED
66
Achssymmetrieaxial symmetry
77
Punktsymmetriepoint symmetry

Claims (5)

LED-Modul (1) zur Beleuchtung eines Objektes welches eine Vielzahl von Weißlicht-LEDs (2) und Farb-LEDs (3, 4, 5) aufweist, dadurch gekennzeichnet, daß auf dem LED-Modul (1) mehrere Weißlicht-LEDs (2) matrixförmig auf einer Fläche verteilt angeordnet sind und mindestens eine Farb-LED (3, 4, 5), die eine Schwerpunktwellenlänge aussendet, in unmittelbarer Nähe zu jeder der Weißlicht-LEDs (2) angeordnet ist und eine Symmetrie (6, 7) zwischen jeder Weißlicht-LED (2) und der jeweils zugeordneten Farb-LED (3, 4, 5) hergestellt ist.LED module ( 1 ) for illuminating an object which a plurality of white light LEDs ( 2 ) and color LEDs ( 3 . 4 . 5 ), characterized in that on the LED module ( 1 ) several white light LEDs ( 2 ) are distributed matrix-like on a surface and at least one color LED ( 3 . 4 . 5 ) emitting a centroid wavelength in close proximity to each of the white light LEDs ( 2 ) and a symmetry ( 6 . 7 ) between each white light LED ( 2 ) and the associated color LED ( 3 . 4 . 5 ) is made. LED-Modul nach Anspruch 1, dadurch gekennzeichnet, daß die Symmetrie bezüglich einer Achse (6) oder bezüglich eines Punktes (7) hergestellt ist.LED module according to claim 1, characterized in that the symmetry with respect to an axis ( 6 ) or with respect to a point ( 7 ) is made. LED-Modul nach Anspruch 1, dadurch gekennzeichnet, daß an einer Seite jeder Weißlicht-LED (2) eine Farb-LED (3, 4, 5) mit einer gleichen Schwerpunktwellenlänge angeordnet ist.LED module according to claim 1, characterized in that on one side of each white light LED ( 2 ) a color LED ( 3 . 4 . 5 ) is arranged with a same centroid wavelength. LED-Modul nach Anspruch 1, dadurch gekennzeichnet, daß an den vier Seiten jeder Weißlicht-LED (2) eine Farb-LED (3, 4, 5) angeordnet ist, wobei die örtliche Zuordnung der Schwerpunktwellenlängen der Farb-LEDs (3, 4, 5) zu den Weißlicht-LEDs (2) innerhalb eines LED-Moduls (1) gleich ist.LED module according to claim 1, characterized in that on the four sides of each white light LED ( 2 ) a color LED ( 3 . 4 . 5 ), wherein the spatial assignment of the center wavelengths of the color LEDs ( 3 . 4 . 5 ) to the white light LEDs ( 2 ) within an LED module ( 1 ) is equal to. LED-Modul nach Anspruch 1, dadurch gekennzeichnet, daß jede Weißlicht-LED (2) durch eine kreuzförmige Anordnung von Farb-LEDs (3, 4, 5) geviertelt ist, wobei die örtliche Zuordnung der Schwerpunktwellenlängen der Farb-LEDs (3, 4, 5) zu den Weißlicht-LEDs (2) innerhalb eines LED-Moduls (1) gleich ist.LED module according to claim 1, characterized in that each white light LED ( 2 ) by a cross-shaped arrangement of color LEDs ( 3 . 4 . 5 ), wherein the spatial assignment of the center wavelengths of the color LEDs ( 3 . 4 . 5 ) to the white light LEDs ( 2 ) within an LED module ( 1 ) is equal to.
DE102005017206A 2005-04-14 2005-04-14 LED module for head up display of vehicle, has color LED, which sends spectral centroid and is arranged in direct proximity to white light LED, where symmetry in terms of axis or point is produced between each white light LED and color LED Ceased DE102005017206A1 (en)

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DE102005017206A DE102005017206A1 (en) 2005-04-14 2005-04-14 LED module for head up display of vehicle, has color LED, which sends spectral centroid and is arranged in direct proximity to white light LED, where symmetry in terms of axis or point is produced between each white light LED and color LED

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Application Number Priority Date Filing Date Title
DE102005017206A DE102005017206A1 (en) 2005-04-14 2005-04-14 LED module for head up display of vehicle, has color LED, which sends spectral centroid and is arranged in direct proximity to white light LED, where symmetry in terms of axis or point is produced between each white light LED and color LED

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0921568A2 (en) * 1997-11-25 1999-06-09 Matsushita Electric Works, Ltd. LED Luminaire
DE29914941U1 (en) * 1999-08-26 1999-11-25 Everlight Electronics Co Color mixing device working with LEDs
DE10016817A1 (en) * 2000-04-05 2001-10-18 Mannesmann Vdo Ag Color head-up display, especially for a vehicle
US6698121B2 (en) * 2001-05-04 2004-03-02 Young Electric Sign Co. Digital dasher boards for sports arenas
DE10335077A1 (en) * 2003-07-31 2005-03-03 Osram Opto Semiconductors Gmbh LED module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0921568A2 (en) * 1997-11-25 1999-06-09 Matsushita Electric Works, Ltd. LED Luminaire
DE29914941U1 (en) * 1999-08-26 1999-11-25 Everlight Electronics Co Color mixing device working with LEDs
DE10016817A1 (en) * 2000-04-05 2001-10-18 Mannesmann Vdo Ag Color head-up display, especially for a vehicle
US6698121B2 (en) * 2001-05-04 2004-03-02 Young Electric Sign Co. Digital dasher boards for sports arenas
DE10335077A1 (en) * 2003-07-31 2005-03-03 Osram Opto Semiconductors Gmbh LED module

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Effective date: 20120530