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:
Sep. 07, 2010
Filed:
Sep. 04, 2007
Grigoriy Basin, San Francisco, CA (US);
Ashim Shatil Haque, San Jose, CA (US);
Ching-hui Chen, San Jose, CA (US);
Robert Scott West, Morgan Hill, CA (US);
Paul Martin, Pleasanton, CA (US);
Grigoriy Basin, San Francisco, CA (US);
Ashim Shatil Haque, San Jose, CA (US);
Ching-hui Chen, San Jose, CA (US);
Robert Scott West, Morgan Hill, CA (US);
Paul Martin, Pleasanton, CA (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Philips Lumileds Lighting Company, LLC, San Jose, CA (US);
Abstract
In one embodiment, sub-micron size granules of TiO, ZrO, or other white colored non-phosphor inert granules are mixed with a silicone encapsulant and applied over an LED. In one experiment, the granules increased the light output of a GaN LED more than 5% when the inert material was between about 2.5-5% by weight of the encapsulant. Generally, a percentage of the inert material greater than 5% begins to reduce the light output. If the LED has a yellowish YAG phosphor coating, the white granules in the encapsulant make the LED appear whiter when the LED is in an off state, which is a more pleasing color when the LED is used as a white light flash in small cameras. The addition of the granules also reduces the variation of color temperature over the view angle and position over the LED, which is important for a camera flash and projection applications.