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:
Feb. 17, 2015
Filed:
Nov. 27, 2009
Hans-helmut Bechtel, Roetgen, DE;
Matthias Heidemann, Aachen, DE;
Peter J. Schmidt, Aachen, DE;
Thomas Diederich, Stolberg, DE;
Hans-Helmut Bechtel, Roetgen, DE;
Matthias Heidemann, Aachen, DE;
Peter J. Schmidt, Aachen, DE;
Thomas Diederich, Stolberg, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A light emission diode (LED) assembly, comprising a LED die (), a phosphor layer (), and a filter layer (), wherein said filter layer () is developed in such a manner that light rays with a wavelength of about 400 nm to 500 nm, preferably of about 420 nm to 490 nm, emitted from the LED die () are at least partially reflected depending on their emission angle to the normal on the filter layer (). With the inventive LED assembly it is possible to provide a LED assembly which solves the yellow ring problem without a reduction of the efficiency of the LED assembly.