EP2083211A1 - Agencement de LED pour la production d'une lumière blanche - Google Patents

Agencement de LED pour la production d'une lumière blanche Download PDF

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Publication number
EP2083211A1
EP2083211A1 EP08250267A EP08250267A EP2083211A1 EP 2083211 A1 EP2083211 A1 EP 2083211A1 EP 08250267 A EP08250267 A EP 08250267A EP 08250267 A EP08250267 A EP 08250267A EP 2083211 A1 EP2083211 A1 EP 2083211A1
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EP
European Patent Office
Prior art keywords
leds
light
light emitting
led
emitting chips
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.)
Withdrawn
Application number
EP08250267A
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German (de)
English (en)
Inventor
Chu-Hsien Lin
Yu-Jen Su
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP08250267A priority Critical patent/EP2083211A1/fr
Publication of EP2083211A1 publication Critical patent/EP2083211A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • F21Y2113/17—Combination of light sources of different colours comprising an assembly of point-like light sources forming a single encapsulated light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to an LED arrangement, and more particularly to an LED arrangement that enables fully mixture of color lights emitted from at least two LEDs to thereby produce a pure monochromatic light having increased illumination intensity and area.
  • a light emitting diode has the advantages of low power consumption, high luminous efficiency, and small in volume.
  • LEDs are usually used as indicator lamps in circuitry, to form an LED array for a large signboard, or in traffic lights at zebra crossings.
  • LEDs are also used as a light source for headlights and taillights of some high-class cars.
  • the LED is internally included one or more light-emitting chips capable of emitting a different color light each. Some of the color lights, such as yellow light, directly emitted from the LED have relatively low stability.
  • yellow light for example, is usually produced by mixing green light and red light separately emitted from two light emitting chips provided in one LED, so that the yellow light has increased stability for use.
  • Fig. 1 shows a conventional LED 10 being provided with two light emitting chips 11, 12 that separately emit a different color light.
  • the chip 11 at the left side in the LED 10 emits a red color light that is biased rightward when being projected forward
  • the chip 12 at the right side in the LED 10 emits a green color light that is biased leftward when being projected forward.
  • the red light and the green light emitted from the LED 10 are overlapped on a light-projected surface to produce a central yellow light zone 13.
  • a red light zone 14 and a green light zone 15 are remained at two lateral sides of the central yellow light zone 13.
  • the central yellow light zone 13 is an effective area at where the red and the green light are fully mixed. Since a yellow image formed on the light-projected surface by the mixed red and green color lights emitted from the LED 10 still has red and green color lights remained thereat, the light mixture effect of the LED 10 is reduced.
  • the semiconductor industrial field has developed an LED 20 provided with light emitting chips 21, 22, and 23 that are capable of emitting red, green, and blue light, respectively.
  • the LED 20 is usually referred to as an RGB (Red, Green, and Blue) LED, as shown in Fig. 2 .
  • RGB Red, Green, and Blue
  • the red light, the green light, and the blue light emitted from the red, green, and blue light emitting chips 21, 22, 23, respectively, are overlapped on a light-proj ected surface 24 to produce a central white light zone 25.
  • a red light zone 26, a green light zone 27, and a blue light zone 28 still appear on the light-projected surface 24 to locate around the central white light zone 25.
  • the LED 20 produces only a reduced white light effect.
  • the LED arrangement developed by the inventor may also be applied to other LEDs for mixture of other color lights to produce different pure monochromatic lights.
  • a primary object of the present invention is to provide an LED arrangement, in which LEDs with light mixture function are particularly combined and arranged to thereby produce a monochromatic light with increased illumination intensity and area.
  • Another object of the present invention is to provide an LED arrangement, which enables different color light zones remained around a central light zone to overlap and mix with one another to thereby produce a monochromatic light the same as that at the central light zone.
  • the LED arrangement according to an embodiment of the present invention includes at least two identical LEDs.
  • Each of the two identical LEDs is provided with at least two light emitting chips that separately emit a different color light.
  • the light emitting chips in each LED are equally angularly spaced.
  • the number of the LEDs to be arranged is equal to that of the light emitting chips in each of the LEDs.
  • the LEDs are located as close as possible to one another, such that light emitted from different LEDs are overlapped on a light-projected surface.
  • the LEDs are so arranged that a following one of the LEDs is rotated by a predetermined rotation angle relative to a preceding one.
  • the rotation angle is equal to an angle at which the light emitting chips in each of the LEDs are angularly spaced. In this manner, the color lights emitted from different LEDs and projected on a surface are mixed to produce a monochromatic light.
  • the LED arrangement includes at least two LEDs.
  • Each of the LEDs is provided with at least two light emitting chips that separately emit a different color light.
  • the number and the layout of the light emitting chips in all the LEDs are the same, and the light emitting chips located in different LEDs at the same corresponding positions separately emit a different color light, such that lights emitted from the LEDs may be fully mixed with one another to produce a monochromatic light.
  • the LEDs may be arranged in a straight line or in an endless shape.
  • Figs. 4 and 5 are perspective and plan views, respectively, of an LED arrangement 1 according to a first embodiment of the present invention, in which three identical LEDs 20 as shown in Fig. 2 are positioned in a particular way for producing pure white light.
  • the three LEDs 20 are arranged in a straight line and are separately referred to as middle, right, and left LED 20.
  • Each of the LEDs 20 has three light emitting chips, namely, an R chip 21 capable of emitting red light, a G chip 22 capable of emitting green light, and a B chip 23 capable of emitting blue light.
  • the three light emitting chips 21, 22, 23 in the same one LED 20 are angularly spaced from one another at 120 degrees.
  • the three LEDs 20 are so mounted that the right LED 20 is rotated clockwise by 120 degrees relative to the middle LED 20, and the left LED 20 is rotated clockwise by 240 degrees relative to the middle LED 20. Red, green, and blue lights emitted from the same one LED 20 are overlapped on a light-projected surface 30 to produce a central white light zone 25. Meanwhile, there are a red light zone 26, a green light zone 27, and a blue light zone 28 appeared around the central white light zone 25.
  • the three LEDs 20 arranged in a straight line are positioned as close as possible, so that lights emitted from the three LEDs 20 are overlapped on the light-projected surface 30, which is located away from the LEDs 20 by a certain distance, to increase the intensity of the central white light zone 25.
  • the R chip 21 is located directly below a center of the middle LED 20
  • the G chip 22 is located to the right side of and angularly spaced from the R chip 21 at 120 degrees
  • the B chip 23 is located to the left side of and angularly spaced from the R chip 21 at 120 degrees.
  • An image 31 formed on the light-projected surface 30 by the color lights emitted from the middle LED 20 has a central white light zone 25, at where the red light, the green light, and the blue light emitted from the middle LED 20 are overlapped.
  • a red light zone 26, a green light zone 27, and a blue light zone 28 are located above, to the left, and to the right of the central white light zone 25, respectively.
  • the G chip 22 is located directly below a center of the right LED 20
  • the B chip 23 is located to the right side of and angularly spaced from the G chip 22 at 120 degrees
  • the R chip 21 is located to the left side of and angularly spaced from the G chip 22 by 120 degrees.
  • An image 32 formed on the light-projected surface 30 by the color lights emitted from the right LED 20 has a central white light zone 25, at where the red light, the green light, and the blue light emitted from the right LED 20 are overlapped.
  • a green light zone 27, a blue light zone 28, and a red light zone 26 are located above, to the left, and to the right of the central white light zone 25, respectively.
  • the B chip 23 is located directly below a center of the left LED 20
  • the R chip 21 is located to the right side of and angularly spaced from the B chip 23 at 120 degrees
  • the G chip 22 is located to the left side of and angularly spaced from the B chip 23 at 120 degrees.
  • An image 33 formed on the light-projected surface 30 by the color lights emitted from the left LED 20 has a central white light zone 25, at where the red light, the green light, and the blue light emitted from the right LED 20 are overlapped.
  • a blue light zone 28, a red light zone 26, and a green light zone 27 are located above, to the left, and to the right of the central white light zone 25, respectively.
  • the color lights emitted from the above-mentioned three LEDs 20 closely arranged in a straight line are overlapped on the light-projected surface 30, that is, the three images 31, 32, 33 are overlapped on the light-projected surface 30, so that the central white light zones 25 of the three images 31, 32, 33 are overlapped to produce white light with an increased intensity.
  • the red light zone 26, the green light zone 27, and the blue light zone 28 produced by the middle, the right, and the left LED 20, respectively, and located above the central white light zones 25 are overlapped on the light-proj ected surface 30 to produce white light;
  • the green light zone 27, the blue light zone 28, and the red light zone 26 produced by the middle, the right, and the left LED 20, respectively, and located to the left of the central white light zones 25 are also overlapped on the light-proj ected surface 30 to produce white light;
  • the blue light zone 28, the red light zone 26, and the green light zone 27 produced by the middle, the right, and the left LED 20, respectively, and located to the right of the central white light zones 25 are also overlapped on the light-projected surface 30 to produce white light.
  • the LED arrangement 1 of the present invention may include more than three LEDs 20, so that the white light produced by the LED arrangement 1 has even higher illumination intensity more suitable for used as a light source of general lighting fixture.
  • the R, G, B light emitting chips 21, 22, 23 of each of the three LEDs 20 in the LED arrangement 1 are equally angularly spaced from each other.
  • the number of the LEDs 20 in the LED arrangement 1 is three, which is equal to the number of the light emitting chips 21, 22, 23 in each of the LEDs 20.
  • the three LEDs 20 in the LED arrangement 1 are sequentially rotated relative to a preceding one by a fixed rotation angle, and the rotation angle for each of the three LEDs 20 corresponds to the angle at which the R, G, and B chips 21 thereof are spaced from one another, such that the R chip 21, the G chip 22, and the B chip 23 separately provided in the three LEDs 20 are located at the same corresponding angular positions. In this manner, the color lights emitted from the three LEDs 20 in the LED arrangement 1 could be completely and effectively mixed to obtain a monochromatic light across a relatively large area and having a relatively high intensity.
  • the LED arrangement 1 according to the first embodiment includes more than three LEDs 20, these LEDs 20 may be sequentially arranged in an endless shape, such as a square formed from four LEDs 20, and a regular pentagonal ring shape formed from five LEDs 20.
  • Fig. 9 shows an LED arrangement 2 according to a third embodiment of the present invention.
  • the LED arrangement 2 includes three linearly arranged LEDs 40, namely, a middle, a right, and a left LED 40.
  • Each of the three LEDs 40 is internally provided with two sets of three sequentially arranged light emitting chips 41, 42, 43.
  • the six light emitting chips are equally angularly spaced at an angle of 60°.
  • the two chips 41 emit red light and are briefly referred to as R chips 41 herein
  • the two chips 42 emit green light and are briefly referred to as G chips 42 herein
  • the two chips 43 emit blue light and are briefly referred to as B chips 43 herein.
  • the number of the LEDs 40 in the LED arrangement 2 is equal to the number of color lights emitted from the chips 41, 42, 43.
  • the rotation angle for the LEDs 40 is a multiple of 60°, at which the light emitting chips 41, 42, 43 are angularly spaced in each of the LEDs 40.
  • the R chip 51, the B chip 63, and the G chip 72 are located in the LEDs 50, 60, 70, respectively, at the same corresponding positions; the G chip 52, the R chip 61, and the B chip 73 are located in the LEDs 50, 60, 70, respectively, at the same corresponding positions; and the B chip 53, the G chip 62, and the R chip 71 are located in the LEDs 50, 60, 70, respectively, at the same corresponding positions.
  • the red, green, and blue lights emitted from each of the three LEDs 50, 60, 70 are mixed to produce pure white light.
  • the present invention provides different LED arrangements, in each of which a plurality of LEDs are particularly arranged to enable mixture of color lights emitted from the light emitting chips in the LEDs to produce a pure monochromatic light.
  • the conventional RGB LEDs for emitting white light may be positioned in special manners to produce white light with increased illumination intensity and area, so that LEDs may have expanded applications and be used as a light source for general lighting fixture.
EP08250267A 2008-01-22 2008-01-22 Agencement de LED pour la production d'une lumière blanche Withdrawn EP2083211A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08250267A EP2083211A1 (fr) 2008-01-22 2008-01-22 Agencement de LED pour la production d'une lumière blanche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08250267A EP2083211A1 (fr) 2008-01-22 2008-01-22 Agencement de LED pour la production d'une lumière blanche

Publications (1)

Publication Number Publication Date
EP2083211A1 true EP2083211A1 (fr) 2009-07-29

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EP08250267A Withdrawn EP2083211A1 (fr) 2008-01-22 2008-01-22 Agencement de LED pour la production d'une lumière blanche

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EP (1) EP2083211A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011094122A3 (fr) * 2010-01-27 2011-11-10 Cree, Inc. Dispositif d'éclairage avec émetteurs de lumière multi-puces, éléments de support d'émetteurs de lumière à semi-conducteur et éléments d'éclairage
US8901845B2 (en) 2009-09-24 2014-12-02 Cree, Inc. Temperature responsive control for lighting apparatus including light emitting devices providing different chromaticities and related methods
TWI509586B (zh) * 2012-08-06 2015-11-21 Lextar Electronics Corp 可撓式顯示面板

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0830213A (ja) * 1994-07-18 1996-02-02 Rohm Co Ltd 発光ダイオード表示装置
JPH1012926A (ja) * 1996-06-20 1998-01-16 Toyoda Gosei Co Ltd 全色発光型発光ダイオードランプ及びディスプレイ装置
WO2007008048A1 (fr) * 2005-07-14 2007-01-18 Samsung Electronics Co., Ltd. Unité de rétroéclairage et affichage à cristaux liquides la comportant
US20070115670A1 (en) * 2005-11-18 2007-05-24 Roberts John K Tiles for solid state lighting panels
WO2008010130A2 (fr) * 2006-07-18 2008-01-24 Koninklijke Philips Electronics N.V. Source de lumière composite

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0830213A (ja) * 1994-07-18 1996-02-02 Rohm Co Ltd 発光ダイオード表示装置
JPH1012926A (ja) * 1996-06-20 1998-01-16 Toyoda Gosei Co Ltd 全色発光型発光ダイオードランプ及びディスプレイ装置
WO2007008048A1 (fr) * 2005-07-14 2007-01-18 Samsung Electronics Co., Ltd. Unité de rétroéclairage et affichage à cristaux liquides la comportant
US20070115670A1 (en) * 2005-11-18 2007-05-24 Roberts John K Tiles for solid state lighting panels
WO2008010130A2 (fr) * 2006-07-18 2008-01-24 Koninklijke Philips Electronics N.V. Source de lumière composite

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8901845B2 (en) 2009-09-24 2014-12-02 Cree, Inc. Temperature responsive control for lighting apparatus including light emitting devices providing different chromaticities and related methods
WO2011094122A3 (fr) * 2010-01-27 2011-11-10 Cree, Inc. Dispositif d'éclairage avec émetteurs de lumière multi-puces, éléments de support d'émetteurs de lumière à semi-conducteur et éléments d'éclairage
CN102812284A (zh) * 2010-01-27 2012-12-05 科锐公司 具有多芯片发光体的照明设备、固态发光体支撑构件和照明元件
US8508116B2 (en) 2010-01-27 2013-08-13 Cree, Inc. Lighting device with multi-chip light emitters, solid state light emitter support members and lighting elements
CN102812284B (zh) * 2010-01-27 2016-07-13 科锐公司 具有多芯片发光体的照明设备、固态发光体支撑构件和照明元件
TWI509586B (zh) * 2012-08-06 2015-11-21 Lextar Electronics Corp 可撓式顯示面板

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