WO2006077488A2 - Dispositif del equipe d'une pluralite de diodes del - Google Patents

Dispositif del equipe d'une pluralite de diodes del Download PDF

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Publication number
WO2006077488A2
WO2006077488A2 PCT/IB2006/000089 IB2006000089W WO2006077488A2 WO 2006077488 A2 WO2006077488 A2 WO 2006077488A2 IB 2006000089 W IB2006000089 W IB 2006000089W WO 2006077488 A2 WO2006077488 A2 WO 2006077488A2
Authority
WO
WIPO (PCT)
Prior art keywords
led
diodes
led device
light beam
diode
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.)
Ceased
Application number
PCT/IB2006/000089
Other languages
English (en)
Other versions
WO2006077488A3 (fr
Inventor
Bruno Baiardi
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.)
SPACE CANNON VH SpA
Original Assignee
SPACE CANNON VH SpA
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 SPACE CANNON VH SpA filed Critical SPACE CANNON VH SpA
Priority to EP06710240A priority Critical patent/EP1842243A2/fr
Publication of WO2006077488A2 publication Critical patent/WO2006077488A2/fr
Publication of WO2006077488A3 publication Critical patent/WO2006077488A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations

Definitions

  • the present invention relates to a LED device according to the preamble of claim 1.
  • LED Light Emitting Diode
  • Various LED (Light Emitting Diode) devices are known in the art which comprise a light source consisting of a single LED diode which allows to generate a white or coloured light beam; said LED devices are fitted with a rather simple optical system, usually consisting of a hemispherical lens, which allows to modify the light beam emission angle.
  • Light projectors are also known which generally utilize a plurality of LED devices, each having a single LED diode; in order to match the light beam generated by said plurality of LED devices, it is necessary to use a second optical system which allows to obtain a homogeneous light beam.
  • the use of a plurality of LED devices each having a single LED diode requires that the mixing of the light beams emitted by said devices, which may also have different colours, takes place outside the LED device; since the structure of every LED device compels to position each LED diode at a great distance from the LED diode of another LED device, the mixing of the different light beams turns out to be complex and poorly effective.
  • Light projectors are also known which employ LED devices comprising a plurality of LED diodes having different colours; furthermore, the techniques known in the art also include the possibility of combining the three primary colours most commonly used, i.e. red, blue and green, so as to provide a plurality of colours depending on the mixing of said primary colours.
  • the US Patent Application No. US 2003/0076034 describes a LED device comprising a plurality of LED diodes, in particular red, green and blue LED diodes, which emit a red, green and blue light beam, respectively; the light beams emitted by the red, green and blue LED diodes are combined in various manners in order to generate a wide range of colours which can be perceptible by the human eye.
  • the LED diodes are positioned on the base of the LED device in such a way as to be aligned horizontally.
  • Such a LED device has several drawbacks in that, in order to allow for the. mixing of the light beams emitted by the LED diodes, it is necessary to use a collimator, in particular being rectangular in shape, which concentrates the light emitted by every single LED diode into a single light beam.
  • Another problem of the LED device according to the above-mentioned US Patent Application lies in the fact that, the LED diodes being aligned, such a positioning of the LED diodes does not allow to obtain a uniform distribution of the light beams emitted by the LED diodes, so that the user perceives the various light sources, consisting of every single LED diode, instead of a homogeneous light beam.
  • a further problem of such a LED device lies in the fact that the colour variations, or colour corrections, allowed by the red, green and blue LED diodes are not continuous, so that it is not possible to obtain small modifications with said corrections.
  • the main object of the present invention is to provide a LED device comprising a plurality of LED diodes, constructed in such a way as to provide a homogeneous light beam.
  • a further object of the present invention is to provide a LED device comprising a plurality of LED diodes wherein the different punctiform sources represented by the plurality of LED diodes, adapted to generate the light beam, are not perceptible by a user.
  • a further object of the present invention is to provide a LED device comprising a plurality of LED diodes which gives the possibility of obtaining a light beam having different simultaneous colours being continuously adjustable.
  • the present invention provides a LED device incorporating the features of the annexed claims, which form an integral part of the present description. Further objects, features and advantages of the present invention will become apparent from the following detailed description and annexed drawings, which are supplied by way of non- limiting example, wherein:
  • Fig. 1 shows a perspective view of a LED device incorporating the features of the present invention
  • Fig. 2 shows a top view of a LED device incorporating the features of the present invention
  • Figs. 3a and 3b show two sectional side views, according to the line III - III of Fig. 1, of a first and a second embodiments of a LED device incorporating the features of the present invention.
  • Fig. 1 shows a LED device 1 incorporating the features of the present invention and comprising a structure 2 having a base 3, side walls 4 and a light source comprising a plurality of LED diodes 5R, 5G, 5B, 5 W.
  • said plurality of LED diodes consists of high-power LED diodes 5R, 5G, 5B, 5W, in particular having a power of at least IW.
  • said plurality of LED diodes comprises four LED diodes
  • 5R, 5G, 5B, 5W positioned on said base 3 according to a matrix pattern.
  • Fig. 2 which represents a top view of a LED device incorporating the features of the present invention
  • said four LED diodes 5R, 5G, 5B, 5W are positioned on the base 3 in such a way as to cover an area being substantially square.
  • each of said LED diodes 5R, 5G, 5B, 5W is positioned at a close distance D from the remaining LED diodes of said plurality; in particular, the distance D which separates each of the four LED diodes from the adjoining LED diodes (e.g. the LED diode 5R from the LED diodes 5G and 5W) is in a range between 0.1 and 1 mm.
  • Such a matrix arrangement of the LED diodes 5R, 5G, 5B, 5 W allows to provide for the light beam emitted by each of said LED diodes 5R, 5G, 5B, 5W, to match in an optimum waythereby allowing the LED device 1 to emit a homogeneous light beam.
  • the four LED diodes 5R, 5G, 5B, 5W have each a different basic colour; in particular, the four LED diodes 5R, 5G, 5B, 5W comprise a LED diode 5R emitting a Red light beam, a LED diode 5 G emitting a Green light beam, a LED diode 5B emitting a Blue light beam, and a LED diode 5W emitting a light beam having a different basic colour.
  • the LED diode 5W emitting a light beam having a different basic colour is a LED diode which emits a White or Amber light beam.
  • Each of said LED diodes 5R, 5G, 5B, 5W is respectively connected to an anode Al, A2, A3,
  • the LED diode 5R is connected to the anode Al and the cathode Cl; the LED diode 5G is connected to the anode A2 and the cathode C2; the LED diode 5B is connected to the anode A3 and the cathode C3, and finally the LED diode 5 W is connected to the anode A4 and the cathode C4.
  • each of said LED diodes 5R, 5G, 5B, 5W is provided with its own anode and cathode advantageously allows to control said LED diodes 5R, 5G, 5B, 5W individually.
  • the LED device 1 comprises LED diodes being Red (5R), Green (5G) and Blue (5B) in colour with the addition of LED diodes (5W) being White or Amber in colour, and that said LED diodes 5R, 5G, 5B, 5W are controlled individually, the LED device 1 is capable of emitting a light beam covering the entire range of colours which can be perceptible by the human eye, including pure white.
  • the White or Amber LED diode 5W allows to further vary (i.e. adjust) said range of colours emitted by the LED device 1 being the subject of the present invention.
  • a further possibility offered by the combination of the three above-mentioned primary colours, with the addition of the White or Amber LED diode 5W, consists in the availability of one or more colour temperature corrections, allowing to eliminate certain colour temperature gradations before the resulting light beam exits the LED device 1. This allows to obtain light beams having different colour temperatures and suitable for different applications: outdoor lighting, indoor lighting, and so on.
  • the LED diodes 5R, 5G, 5B, 5 W are positioned on the base 3, which preferably consists of a plate made of a metallic material, in particular copper or aluminium.
  • the height of said base 3 is substantially equal to approximately half the height of the walls 4 of the structure 2; the base 3 may then be positioned directly in contact with the printed circuit on which the LED device 1 is located, or else it may be positioned on a heat sink (not shown in the illustrations) suitable for preventing the heat produced by the LED diodes 5R, 5G, 5B, 5W from increasing the temperature within the structure 2 to levels which may damage the LED device 1.
  • the light produced by the LED diodes 5R, 5G, 5B, 5W creates a light beam which exits the LED device 1 through a lens 6, which is located at an open end portion 7 of the structure 2.
  • the shape of the section of the light beam may be modified by using various types of lenses 6, e.g. flat lenses, convex lenses, the type of lenses known as "frost", etc., so that the light beam may be adapted to any specific application of the LED device 1.
  • the lens 6 may also be shaped in such a way as to provide the utmost concentration of the light emitted by every single LED diode 5R, 5G, 5B, 5W in order to obtain a substantially parallel light beam.
  • the matrix arrangement of the LED diodes according to the present invention allows to match the light beams emitted by each of said LED diodes and to obtain a homogeneous light beam; furthermore, the fact that each LED diode is positioned at a very short distance from the adjoining LED diodes, arranged according to a matrix pattern, allows to obtain a LED device being so constructed as to prevent a user from perceiving the different punctiform sources represented by the LED diodes generating the light beam.
  • Another advantage of the present invention is the fact that the LED device may generate light beams having different colour shades, thanks to the differentiation of colours and to the lighting independence of the different LED diodes which make up the light source.
  • White or Amber in colour on the one hand makes the calibration of the desired final colour simpler, and on the other hand allows to obtain light beams having a colour temperature being different from that generated by said LED diodes of the three primary colours, thereby making the LED device adapted to many different applications, e.g. for both outdoor and indoor lighting.
  • the LED device provided with a base 3' as shown in
  • the height of the base 3' is substantially equal to the height of the side walls 4 of the structure 2 of the LED device 1. This allows to position the LED diodes 5R, 5G, 5B, 5W at such a height that the light they emit does not hit an inner surface 21 of the structure 2 and that the various light beams generated by the LED diodes 5R, 5G, 5B,
  • the present invention also relates to a light projector comprising at least one LED device 1 incorporating one or more of the above-described features.

Landscapes

  • Led Device Packages (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

L'invention concerne un dispositif à diodes électroluminescentes (DEL) qui comprend: une structure (2) pourvue d'une base (3, 3') et de parois latérales (4); et une source lumineuse équipée d'une pluralité de diodes DEL (5R, 5G, 5B, 5W). L'invention est caractérisée en ce que ladite pluralité de diodes DEL (5R, 5G, 5B, 5W) comprend quatre diodes DEL (5R, 5G, 5B, 5W) montées sur ladite base (3, 3') selon un motif matriciel.
PCT/IB2006/000089 2005-01-21 2006-01-20 Dispositif del equipe d'une pluralite de diodes del Ceased WO2006077488A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06710240A EP1842243A2 (fr) 2005-01-21 2006-01-20 Dispositif del equipe d'une pluralite de diodes del

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000028A ITTO20050028A1 (it) 2005-01-21 2005-01-21 Dispositivo a led comprendente una pluralita' di diodi led
ITTO2005A000028 2005-01-21

Publications (2)

Publication Number Publication Date
WO2006077488A2 true WO2006077488A2 (fr) 2006-07-27
WO2006077488A3 WO2006077488A3 (fr) 2006-12-07

Family

ID=36480938

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/000089 Ceased WO2006077488A2 (fr) 2005-01-21 2006-01-20 Dispositif del equipe d'une pluralite de diodes del

Country Status (3)

Country Link
EP (1) EP1842243A2 (fr)
IT (1) ITTO20050028A1 (fr)
WO (1) WO2006077488A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2180506A1 (fr) 2008-10-27 2010-04-28 OSRAM Opto Semiconductors GmbH Dispositif de diode électroluminescente comportant un agencement de diode
EP2273568A4 (fr) * 2008-04-30 2011-10-12 Zhejiang Manelux Lighting Co Ltd Led à lumière blanche et lampe comportant la led à lumière blanche
EP3396712A1 (fr) * 2017-04-24 2018-10-31 Ningbo Sunpu Led Co., Ltd. Dispositif de source de lumière à température de couleur réglable

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122794B (en) * 1982-06-15 1985-09-18 Standard Telephones Cables Ltd Liquid crystal display
US4800375A (en) * 1986-10-24 1989-01-24 Honeywell Inc. Four color repetitive sequence matrix array for flat panel displays
US6335548B1 (en) * 1999-03-15 2002-01-01 Gentex Corporation Semiconductor radiation emitter package
US7012588B2 (en) * 2001-06-05 2006-03-14 Eastman Kodak Company Method for saving power in an organic electroluminescent display using white light emitting elements
US7397485B2 (en) * 2002-12-16 2008-07-08 Eastman Kodak Company Color OLED display system having improved performance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2273568A4 (fr) * 2008-04-30 2011-10-12 Zhejiang Manelux Lighting Co Ltd Led à lumière blanche et lampe comportant la led à lumière blanche
EP2180506A1 (fr) 2008-10-27 2010-04-28 OSRAM Opto Semiconductors GmbH Dispositif de diode électroluminescente comportant un agencement de diode
EP3396712A1 (fr) * 2017-04-24 2018-10-31 Ningbo Sunpu Led Co., Ltd. Dispositif de source de lumière à température de couleur réglable

Also Published As

Publication number Publication date
WO2006077488A3 (fr) 2006-12-07
ITTO20050028A1 (it) 2006-07-22
EP1842243A2 (fr) 2007-10-10

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