The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 2010
Filed:
Aug. 26, 2005
Grigoriy Basin, San Francisco, CA (US);
Paul S. Martin, Pleasanton, CA (US);
Robert Scott West, Morgan Hill, CA (US);
Yasumasa Morita, Sunnyvale, CA (US);
Tewe Heemstra, Veldhoven, NL;
Grigoriy Basin, San Francisco, CA (US);
Paul S. Martin, Pleasanton, CA (US);
Robert Scott West, Morgan Hill, CA (US);
Yasumasa Morita, Sunnyvale, CA (US);
Tewe Heemstra, Veldhoven, NL;
Koninklijke Philips Electronics, N.V., Eindhoven, NL;
Philips Lumileds Lighting, LLC, San Jose, CA (US);
Abstract
A technique for forming a white light LED is disclosed. In one embodiment, the LED emits blue light. A first phosphor for producing red, yellow, yellow-green, or green light is formed to conformably coat the LED die. One suitable deposition technique is electrophoretic deposition (EPD). Over the resulting LED structure is deposited another phosphor (to add the remaining color component) in a binder (e.g., silicone) for encapsulating the die. The blue LED light combines with the two phosphor colors to create white light. Since the two different deposition techniques are independent and easily controllable, the resulting white light temperature is highly controllable and the color emission is substantially uniform.