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:
Apr. 23, 2013
Filed:
Sep. 16, 2009
Eric Boonekamp, Utrecht, NL;
Johannes P. M. Ansems, Hulsel, NL;
Marco Van As, Waalre, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The invention provides an illumination device (), arranged to provide illumination device light (). The illumination device () comprising a light chamber (), an electrically variable scattering element (), and a controller (). The light chamber () contains a light emitting diode () (LED) arranged to emit LED light (); comprises a luminescent material layer () arranged remote from the LED () and arranged to absorb at least part of the LED light () and emit luminescent material emission (); and comprises an exit face (), through which one or more of the LED light () and the luminescent material emission () may escape to the exterior () of the light chamber () thereby providing illumination device light (). The electrically variable scattering element () is arranged downstream of the luminescent material layer () and upstream of the exit face (). The controller () is electrically connected to the electrically variable scattering element () and arranged to control the scattering of the electrically variable scattering element (). Such device may allow the possibility of color tuning and/or correlated color temperature tuning of the illumination device light.