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:
Jul. 29, 2014
Filed:
Jul. 11, 2012
Antony P. Van DE Ven, Sai Kung, HK;
Jason Taylor, Cary, NC (US);
Paul Kenneth Pickard, Morrisville, NC (US);
Gauss Ho Ching SO, Kowloon, HK;
Heidi Dieringer, Cary, NC (US);
Andrew Dummer, Chapel Hill, NC (US);
Antony P. van de Ven, Sai Kung, HK;
Jason Taylor, Cary, NC (US);
Paul Kenneth Pickard, Morrisville, NC (US);
Gauss Ho Ching So, Kowloon, HK;
Heidi Dieringer, Cary, NC (US);
Andrew Dummer, Chapel Hill, NC (US);
Cree, Inc., Durham, NC (US);
Abstract
Light emitting devices include a first string of LEDs that emit light having a color point that is within at least eight MacAdam ellipses of a first blue-shifted-yellow region on the 1931 CIE Chromaticity Diagram, a second string of LEDs that emit light having color point that is within at least eight MacAdam ellipses of a second blue-shifted-green region on the 1931 CIE Chromaticity Diagram, and a third light source that emits radiation having a dominant wavelength between 600 and 720 nm. A drive circuit supplies respective drive currents to the first string of LEDs, the second string of LEDs and the third light source, at least two of which are independently controllable.