[특허]Multi-colored LED array with improved brightness profile and color uniformity

[미국특허] Multi-colored LED array with improved brightness profile and color uniformity 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F21V-009/00
출원번호	US-0841132 (2004-05-07)
등록번호	US-7320531 (2008-01-22)
발명자 / 주소	West,Robert S. Kuppens,Simon Schrama,Charles Martynov,Yourii Pfeffer,Nicola Konijn,Huub
출원인 / 주소	Philips Lumileds Lighting Company, LLC
대리인 / 주소	Patent Law Group LLP
인용정보	피인용 횟수 : 21 인용 특허 : 10

초록 ▼

A backlight uses an array of red, green, and blue LEDs in a mixing chamber. The mixing chamber has reflecting surfaces and a top opening for illuminating LCD layers. A desired brightness profile and better color uniformity are obtained by using techniques including arranging the LEDs in certain sequences and patterns, providing a specular ring at the base of each LED, attenuating the brightness of the LEDs at the edges, and using widely separated diffusers in the mixing chamber. The arrangement, selection, and control of the multicolored LEDs may be tailored to achieve any desired white point specified by the display manufacturer.

대표청구항 ▼

What is claimed is: 1. A light emitting device comprising: a light mixing cavity having reflective side walls and a reflective bottom surface; a plurality of red, green, and blue light emitting diodes (LEDs) arranged on or near the bottom surface, wherein each LED in the plurality of LED comprises an LED semiconductor chip with a side-emitting lens; a first diffuser substantially parallel with the bottom surface and located above the LEDs a first distance; and a substantially circular reflector directly over and spaced apart from each LED and side-emitting lens to reflect light back toward the bottom surface of the mixing cavity. 2. The device of claim 1 further comprising a second diffuser substantially parallel with the first diffuser and located above the LEDs a second distance, wherein the first distance is between approximately 25%-75% of the second distance. 3. The device of claim 2 further comprising a brightness enhancement film above the second diffuser. 4. The device of claim 2 further comprising one or more liquid crystal display layers above the second diffuser. 5. The device of claim 2 wherein the first distance is between approximately 25%-33% of the second distance. 6. The device of claim 2 wherein the first distance is between approximately 33%-50% of the second distance. 7. The device of claim 2 wherein the first distance is between approximately 50%-75% of the second distance. 8. A method of backlighting a display comprising: energizing a plurality of red, green, and blue light emitting diodes (LEDs) arranged on or near the bottom surface of a light mixing cavity having reflective side walls and a reflective bottom surface, each LED including a side emitting lens to cause a majority of light emitted by each LED to be substantially parallel to the bottom surface; reflecting light emitted by the LEDs generally normal to the bottom surface so that the light emitted by the LEDs generally normal to the bottom surface is mixed in the mixing cavity, wherein reflecting light emitted by the LEDs generally normal to the bottom surface comprises reflecting light by a substantially circular reflector positioned directly over and spaced apart from each LED and side emitting lens to reflect light back toward the bottom surface of the mixing cavity; and diffusing light by a first diffuser located substantially parallel with the bottom surface and located above the LEDs a first distance. 9. A light emitting device comprising: a light mixing cavity having reflective side walls and a reflective bottom surface; a plurality of red, green, and blue light emitting diodes (LEDs) arranged on or near the bottom surface; and a flat planar specular ring surrounding individual LEDs and affixed to the bottom surface of the cavity for reducing Lambertian reflections off the bottom surface in the vicinity of the LEDs, a reflective face of the specular ring being substantially parallel to the bottom surface, areas immediately adjacent to outer boundaries of the flat planar specular ring being non-specular. 10. The device of claim 9 wherein each LED in the plurality of LEDs comprises an LED semiconductor chip with a side-emitting lens to cause a majority of light emitted by each LED to be substantially parallel to the bottom surface. 11. The device of claim 9 wherein the mixing cavity further comprises at least one diffuser above the LEDs. 12. A light emitting device comprising: a light mixing cavity having reflective walls and a reflective bottom surface; and a plurality of red, green, and blue light emitting diodes (LEDs) arranged on or near the bottom surface in a plurality of parallel rows, the red, green, and blue LEDs being arranged in each row to have a repeating sequence of one of GRBG, GRBRG, RGBGR, GRBBRG, RGBBGR, GRBGGBRG, and GRBBRGGRB, wherein an entire sequence along a full length of a row is reversed relative to an entire sequence along a full length of an adjacent row. 13. The device of claim 12 wherein the repeating sequence is GRBRG.

이 특허에 인용된 특허 (10) 인용/피인용 타임라인 분석

Cohen, Jennifer M.; Greene, Raymond G.; Skinner, Dean W.; Strope, Douglas H., Backlight assembly for collimated illumination.
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Iizuka Tetsuya,JPX, Color CCD solid-state image pickup device.
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Hoelen, Christoph Gerard August; Harbers, Gerard, Illumination system and display device.
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Cassidy Robert E. (Lebanon NH) Livingston Douglas J. (Wilmot Flat NH), LED light strip with brightness/current draw control circuitry.
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Pelka David G., Light source for backlighting.
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Murakami,Gen; Saito,Tetsuya; Otaka,Atsushi; Morikawa,Toshiaki; Abe,Tomoaki; Aoki,Dai, Light-emitting unit and method for producing same as well as lead frame used for producing light-emitting unit.
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Popovich, John; Pelka, David G.; Parkyn, William A.; Popovich, Michael J.; Pelka, Eric D., Lighting apparatus.
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Nishitani Shigeyuki,JPX ; Mano Hiroyuki,JPX ; Furuhashi Tsutomu,JPX ; Kudo Yasuyuki,JPX ; Inuzuka Tatsuhiro,JPX ; Futami Toshio,JPX ; Tsunekawa Satoru,JPX, Matrix type liquid crystal display device with data electrode driving circuit in which display information for one scre.
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Fleming James R. (Indianapolis IN) Frezza William A. (North Brunswick NJ) Soloway Gerald S. (Holmdel NJ), Pictorial information processing technique.
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West, Robert S.; Sasser, Gary D.; Stewart, James W., Side emitting LED and lens.
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이 특허를 인용한 특허 (21) 인용/피인용 타임라인 분석

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Hatanaka, Masato; Yokota, Kazuhiro; Wada, Haruaki; Oku, Takashi, Backlight apparatus, liquid crystal display.
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Kim, Gi Cherl; Kang, Seock Hwan; Lee, Sang Yu; Yoon, Ju Young; Song, Chun Ho, Backlight for display device.
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Chang,Shao Han, Backlight module with light emitting diodes having reflective sheets.
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Jung, Il-yong; Cho, Tae-hee, Backlight unit for dynamic image and display employing the same.
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Dong, Fangxu; Ho, Horace C.; Knapp, David J., Color mixing optics for LED illumination device.
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Sugaya, Hiroki, Direct type backlight device and liquid crystal display using the same.
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Whitehead, Lorne A.; Ip, Henry H.; Kwong, Vincent, Displays with a backlight incorporating reflecting layer.
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Hadlich, Daniel; Irving, Eric; Thorson, Mike, Flat panel display assembly with improved luminance uniformity and method for constructing the same.
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Hoelen, Christoph Gerard August; Ansems, Johannes Petrus Maria; Van Oers, Denis Joseph Carel, Illuminat system.
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Blümel, Simon; Ott, Hubert; Plötz, Ludwig; Wanninger, Mario; Kirchberger, Günter; Wolff, Peter; Zeiler, Markus, Illumination device.
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Konaka, Daijiro, LED lamp.
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Park, Jun Seok, Light unit and display apparatus having the same.
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Park, Jun Seok, Light unit and liquid crystal display device having the same.
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Sekela, William; Sommers, Mathew; Stadelman, Larry; Kaminski, Mark; Schultz, Samantha, Refractive optics to provide uniform illumination in a display case.
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Holten, Petrus Adrianus Josephus; Fabriek, Vincent; Tordini, Giorgia; Wegh, Rene Theodorus; Huisman, Bart-hendrik, White light-emitting device.
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Seetzen, Helge, Wide color gamut displays.
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Seetzen, Helge, Wide color gamut displays.
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Seetzen, Helge, Wide color gamut displays.
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[미국특허] Multi-colored LED array with improved brightness profile and color uniformity 원문보기