KR200364708Y1 - White light emitting diode light source - Google Patents
White light emitting diode light source Download PDFInfo
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- KR200364708Y1 KR200364708Y1 KR20040016658U KR20040016658U KR200364708Y1 KR 200364708 Y1 KR200364708 Y1 KR 200364708Y1 KR 20040016658 U KR20040016658 U KR 20040016658U KR 20040016658 U KR20040016658 U KR 20040016658U KR 200364708 Y1 KR200364708 Y1 KR 200364708Y1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
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- 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
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S362/00—Illumination
- Y10S362/80—Light emitting diode
Abstract
백색 발광 다이오드 광원은 인쇄 회로 기판, 및 PCB의 일면 상에 다수의 LED 유닛을 포함하고, LED 유닛의 각각은 기체, 기체 상의 청색 LED 및 청색 LED를 포위하는 적색-녹색-황색 형광체(phosphor) 혼합물을 포함한다. 적색-녹색-황색 형광체 혼합물은 적색 형광체, 녹색 형광체 및 황색 형광체의 혼합물이다. 적색 형광체는 CaS:Eu 또는 SrS:Eu이다. 녹색 형광체는 SrGa2S4:Eu 또는 Ca8EuMnMg(SiO4)4C12이다. 황색 형광체는 YAG:Ce 또는 TbAG:Ce이다. 형광체로부터 방출된 빛은 청색광과 혼합하여 만족스러운 연색성(color rendering property)을 갖는 백색광이 된다.The white light emitting diode light source comprises a printed circuit board, and a plurality of LED units on one side of the PCB, each of which is a mixture of red-green-yellow phosphors surrounding a gas, a blue LED on the gas, and a blue LED. It includes. The red-green-yellow phosphor mixture is a mixture of red phosphor, green phosphor and yellow phosphor. Red phosphors are CaS: Eu or SrS: Eu. The green phosphor is SrGa 2 S 4 : Eu or Ca 8 EuMnMg (SiO 4 ) 4 C 12 . Yellow phosphor is YAG: Ce or TbAG: Ce. The light emitted from the phosphor mixes with the blue light to become white light having a satisfactory color rendering property.
Description
본 고안은 백색 발광 다이오드 광원에 관한 것으로, 특히 만족스러운 연색성 및 고 조명 효율을 가진 백색 발광 다이오드 광원에 관한 것이다.The present invention relates to a white light emitting diode light source, and more particularly to a white light emitting diode light source having satisfactory color rendering and high illumination efficiency.
콤팩트 백색 광원은 스캐너 또는 컬러 패널 디스플레이의 백라이트 모듈에 광범위하게 사용되고 있다. 따라서, 백색 광원의 향상은 또한 관련 산업에서 큰 과제이다.Compact white light sources are widely used in backlight modules of scanners or color panel displays. Therefore, the improvement of the white light source is also a big problem in the related industry.
도 1은 엣지 백라이트 모듈(10)의 분해도이고, 이것은 패널 도광체(100), 패널 도광체(100)의 일측에 램프(102), 램프(102)의 외측에 램프 반사판(104), 및 패널 도광체(100)의 하부에 반사판(106)을 포함한다. 엣지 백라이트 모듈(10)은 프리즘 및 광 확산판(도시 생략)을 추가로 포함한다. 엣지 백라이트 모듈(10)은 패널 디스플레이에 사용될 수 있고, 램프(102)는 백색 발광용 CCFL일 수 있다. 램프(102)로부터 방출된 빛은 램프 반사판(104)에 의해 반사되고, 전방 방출을 위해 패널 도광체(100), 프리즘 및 빛 확산판에 의해 인도된다. 전방 방출은 LCD 장치용 백라이트를 제공할 수 있다.1 is an exploded view of the edge backlight module 10, which is a panel light guide 100, a lamp 102 on one side of the panel light guide 100, a lamp reflector 104 on the outside of the lamp 102, and a panel The reflector 106 is disposed under the light guide 100. The edge backlight module 10 further includes a prism and a light diffuser plate (not shown). The edge backlight module 10 may be used for a panel display, and the lamp 102 may be a CCFL for white light emission. Light emitted from the lamp 102 is reflected by the lamp reflector 104 and guided by the panel light guide 100, the prism and the light diffuser plate for forward emission. Forward emission can provide a backlight for the LCD device.
그렇지만, CCFL는 하기의 문제를 갖는다: (1) 고 구동 전압에 의한 복잡한 회로 설계; (2) 온도에 따라 변화하는 불안정한 조명; 및 (3) 램프의 양 단부에 존재하는 사계. 엣지 백라이트 모듈(10)이 스캐너에 사용되는 경우, 스캐닝 품질은 상기 차선의 조건에 의해 저하한다.However, CCFLs have the following problems: (1) complex circuit design with high drive voltage; (2) unstable illumination that changes with temperature; And (3) four seasons present at both ends of the lamp. When the edge backlight module 10 is used in the scanner, the scanning quality is deteriorated by the above lane conditions.
LED 기술의 급속한 진보에 의해 CCFL를 LED로 대체할 가능성은 증가하고 있고, 백색 LED는 하기의 2개의 방식으로 제공될 수 있다:Rapid advances in LED technology are increasing the likelihood of replacing CCFLs with LEDs, and white LEDs can be provided in two ways:
(1) 청색 LED가 황색 형광체와 함께 사용되고, 이의 조명 효율은 형광체에 의해 영향을 받고 있다.(1) A blue LED is used with a yellow phosphor, and its illumination efficiency is affected by the phosphor.
(2) 적색, 녹색 및 청색 LED가 함께 사용되어 백색광으로 혼합된다. 이 백색 LED의 색 온도는 LED의 공정 변동에 따라 불안정할 수도 있다.(2) Red, green and blue LEDs are used together to mix with white light. The color temperature of this white LED may be unstable depending on the process variation of the LED.
본 고안의 목적은 만족스러운 연색성 및 고 조명 효율을 가진 백색 발광 다이오드 광원을 제공하는 것이다.It is an object of the present invention to provide a white light emitting diode light source having satisfactory color rendering and high illumination efficiency.
도 1은 종래의 엣지 백라이트 모듈의 분해도이다.1 is an exploded view of a conventional edge backlight module.
도 2(a) 및 도 2(b)는 본 고안에 따른 백색 발광 다이오드 광원의 개략도이다.2 (a) and 2 (b) is a schematic diagram of a white light emitting diode light source according to the present invention.
도 3은 LED 유닛의 평면도를 도시한다.3 shows a top view of the LED unit.
도 4는 LED 유닛의 방출 스펙트럼을 나타낸다.4 shows the emission spectrum of the LED unit.
<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>
2 : 백색 발광 다이오드 광원 10 : 엣지 백라이트 모듈2: white light emitting diode light source 10: edge backlight module
20 : PCB 22 : LED 유닛20: PCB 22: LED unit
100 : 패널 도광체 102 : 램프100 panel light guide 102 lamp
104 : 램프 반사판 106 : 반사판104: lamp reflector 106: reflector
220 : 기체 LB : 청색 LED220: gas LB: blue LED
RGY : 적색-녹색-황색 형광체 혼합물 PR : 적색 형광체RGY: red-green-yellow phosphor mixture PR: red phosphor
PG : 녹색 형광체 PY : 황색 형광체PG: green phosphor PY: yellow phosphor
이 목적을 달성하기 위해, 본 고안은 백색 발광 다이오드 광원을 제공한다. 백색 발광 다이오드 광원은 인쇄 회로 기판(PCB), 및 PCB의 일면 상에 다수의 LED 유닛을 포함하고, LED 유닛의 각각은 기체(substrate), 기체 상의 청색 LED 및 청색 LED를 포위하는 적색-녹색-황색 형광체 혼합물을 포함한다. 적색-녹색-황색 형광체 혼합물은 적색 형광체, 녹색 형광체 및 황색 형광체의 혼합물이다. 적색 형광체는 CaS:Eu 또는 SrS:Eu이다. 녹색 형광체는 SrGa2S4:Eu 또는 Ca8EuMnMg(SiO4)4C12이다. 황색 형광체는 YAG:Ce 또는 TbAG:Ce이다. 형광체로부터 방출된 빛은 청색광과 혼합하여 만족스러운 연색성을 갖는 백색광이 된다.To achieve this object, the present invention provides a white light emitting diode light source. The white light emitting diode light source comprises a printed circuit board (PCB), and a plurality of LED units on one side of the PCB, each of which is a red-green- surrounding a substrate, a blue LED on the substrate and a blue LED. Yellow phosphor mixture. The red-green-yellow phosphor mixture is a mixture of red phosphor, green phosphor and yellow phosphor. Red phosphors are CaS: Eu or SrS: Eu. The green phosphor is SrGa 2 S 4 : Eu or Ca 8 EuMnMg (SiO 4 ) 4 C 12 . Yellow phosphor is YAG: Ce or TbAG: Ce. Light emitted from the phosphor is mixed with blue light to become white light having satisfactory color rendering.
상기 내용은 본 고안의 전형적인 실시 형태를 도시하는 것이고, 하기의 상세한 설명과 관련하여 가장 잘 이해될 수 있고, 첨부된 청구항의 범위를 제한하는 것은 아니다.The foregoing description illustrates exemplary embodiments of the present invention, which may be best understood with reference to the following detailed description, and do not limit the scope of the appended claims.
신규성이 있다고 여겨지는 본 고안의 특징은 첨부된 청구항에서 구체적으로개시되고 있다. 그렇지만 본 고안 자체는 본 고안의 하기의 상세한 설명을 참조하여 가장 잘 이해될 것이고, 하기의 상세한 설명은 첨부 도면을 참조하여 본 고안의 임의의 전형적인 실시 형태를 설명한다.Features of the invention that are believed to be novel are specifically disclosed in the appended claims. Nevertheless, the present invention itself will be best understood with reference to the following detailed description of the present invention, the following detailed description of certain exemplary embodiments of the present invention with reference to the accompanying drawings.
(고안의 상세한 설명)(Detailed description of the proposal)
도 2(a) 및 도 2(b)는 본 고안에 따른 백색 발광 다이오드 광원(2)의 개략도이다. 발광 다이오드 광원(2)은 PCB(20), PCB(20)의 일면 상에 다수의 LED 유닛(22) 및 PCB(20)의 다른 면 상에 제어기를 포함한다.2 (a) and 2 (b) are schematic views of the white light emitting diode light source 2 according to the present invention. The light emitting diode light source 2 includes a PCB 20, a plurality of LED units 22 on one side of the PCB 20 and a controller on the other side of the PCB 20.
도 3은 LED 유닛(22)의 평면도를 도시하고, LED 유닛(22)은 절연재 등의 기체(220), 기체(220) 상의 청색 LED(LB)(예를 들면, 400-490㎚의 방출 파장을 갖는 질화물(nitride compound) 재료에 의해 제조된다) 및 청색 LED(LB) 상의 적색-녹색-황색 형광체 혼합물(RGY)을 포함한다. 적색-녹색-황색 형광체 혼합물(RGY)은 적색 형광체(PR), 녹색 형광체(PG) 및 황색 형광체(PY)의 혼합물이다.3 shows a top view of the LED unit 22, which is a substrate 220 such as an insulating material, a blue LED (LB) on the substrate 220 (eg, an emission wavelength of 400-490 nm). And a red-green-yellow phosphor mixture (RGY) on a blue LED (LB). The red-green-yellow phosphor mixture (RGY) is a mixture of red phosphor (PR), green phosphor (PG) and yellow phosphor (PY).
LED 유닛(22)은 청색 LED(LB)에 전력을 공급하기 위해 청색 LED(LB)의 애노드 및 캐소드를 기체(220) 상의 패드(도시 생략)에 접속하는 도전 와이어(도시 생략)를 갖는다. 도전 와이어의 LED와의 접속은 잘 알려진 기술이므로 여기서 상세한 설명은 생략한다. 실증되는 실시 형태에 있어서, 청색 LED(LB)는 표면 장착 패키지가 된다. 청색 LED(LB)는 램프 타입 또는 칩 온 보드(COB) 타입 등의 다른 패키지 타입일 수 있다는 것에 주목해야 한다.The LED unit 22 has a conductive wire (not shown) that connects the anode and cathode of the blue LED LB to a pad (not shown) on the base 220 to power the blue LED LB. Since the connection of the conductive wire with the LED is a well known technique, detailed description thereof will be omitted. In the illustrated embodiment, the blue LED LB becomes a surface mount package. It should be noted that the blue LED LB may be another package type, such as a lamp type or a chip on board (COB) type.
청색 LED(LB)는 적절한 전류에 의해 구동된 후에 청색광을 방출한다. 적색 형광체(PR), 녹색 형광체(PG) 및 황색 형광체(PY)는 청색광을 흡수한 후에 적색광, 녹색광 및 황색광을 각각 방출할 것이다.The blue LED LB emits blue light after being driven by a suitable current. The red phosphor (PR), green phosphor (PG) and yellow phosphor (PY) will emit red light, green light and yellow light, respectively, after absorbing blue light.
도 4는 LED 유닛(22)의 방출 스펙트럼을 나타내고, 이의 커브는 좌측에서 우측으로 청색 LED(LB) 방출 스펙트럼, 녹색 형광체(PG) 방출 스펙트럼, 황색 형광체(PY) 방출 스펙트럼 및 적색 형광체(PR) 방출 스펙트럼이다. 종래 기술의 백색 광원과의 비교에 있어서, 본 고안에 따른 백색 발광 다이오드 광원은 백색 발광 다이오드 광원이 더 넓은 스펙트럼을 갖기 때문에 더 뛰어난 연색성을 갖는다.4 shows the emission spectrum of the LED unit 22, the curve of which is from left to right, blue LED (LB) emission spectrum, green phosphor (PG) emission spectrum, yellow phosphor (PY) emission spectrum and red phosphor (PR) Emission spectrum. In comparison with the white light source of the prior art, the white light emitting diode light source according to the present invention has better color rendering because the white light emitting diode light source has a broader spectrum.
보다 구체적으로, 종래 기술의 백색 광원은 청색 LED 및 황색 형광체만을 사용하기 때문에 빈약한 연색성을 갖는다. 본 고안에 따른 백색 발광 다이오드 광원은 적색 및 녹색 스펙트럼을 또한 망라하기 때문에 더 뛰어난 연색성을 갖는다. 본 고안에 따른 백색 발광 다이오드 광원의 색 온도를 혼합물 중의 적색 형광체(PR), 녹색 형광체(PG) 및 황색 형광체(PY)의 비율을 변화시킴으로써, 탄력적으로 조절할 수 있다.More specifically, the prior art white light sources have poor color rendering because they use only blue LEDs and yellow phosphors. The white light emitting diode light source according to the present invention also has better color rendering since it also covers the red and green spectra. The color temperature of the white light emitting diode light source according to the present invention can be flexibly adjusted by changing the ratio of the red phosphor (PR), the green phosphor (PG) and the yellow phosphor (PY) in the mixture.
본 고안에 있어서, 적색 형광체(PR)는 CaS:Eu 또는 SrS:Eu이지만 이에 제한되지 않는다. 황색 형광체(PY)는 YAG:Ce 또는 TbAG:Ce이지만 이에 제한되지 않는다. 녹색 형광체(PG)는 SrGa2S4:Eu 또는 Ca8EuMnMg(SiO4)4C12이지만 이에 제한되지 않는다. 본 고안은 400-490㎚ 파장의 청색광에 의해 여기될 수 있는 다른 형광체 재료를 사용할 수 있다.In the present invention, the red phosphor (PR) is CaS: Eu or SrS: Eu, but is not limited thereto. The yellow phosphor (PY) is YAG: Ce or TbAG: Ce but is not limited thereto. The green phosphor (PG) is SrGa 2 S 4 : Eu or Ca 8 EuMnMg (SiO 4 ) 4 C 12, but is not limited thereto. The present invention can use other phosphor materials that can be excited by blue light of 400-490 nm wavelength.
게다가, 상기 바람직한 실시 형태에 있어서, 적색-녹색-황색 형광체 혼합물(RGY)은 적색 형광체(PR) 및 녹색 형광체(PG)의 혼합물로 대체되어 만족스러운 색 온도의 백색광을 제공할 수 있다.In addition, in the above preferred embodiment, the red-green-yellow phosphor mixture (RGY) can be replaced with a mixture of red phosphor (PR) and green phosphor (PG) to provide white light of satisfactory color temperature.
본 고안은 이의 바람직한 실시 형태를 참조하여 설명하고 있지만, 본 고안은 이의 상세한 설명에 제한되지 않는다고 이해될 것이다. 다양한 치환 및 변형이 상기의 설명에서 암시되고 있고, 다른 것이 당업자에 의해 발생할 것이다. 따라서, 모든 이러한 치환 및 변형은 첨부된 청구항에서 규정되는 바와 같이 본 고안의 범위 내에 포함될 것이다.Although the present invention has been described with reference to its preferred embodiments, it will be understood that the present invention is not limited to the detailed description thereof. Various substitutions and modifications are suggested in the above description, and others will occur to those skilled in the art. Accordingly, all such substitutions and variations will be included within the scope of the present invention as defined in the appended claims.
한마디로, 본 고안의 백색 발광 다이오드 광원은 만족스러운 연색성 및 고 조명 효율을 갖는다.In short, the white light emitting diode light source of the present invention has satisfactory color rendering and high lighting efficiency.
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