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:
Jun. 08, 2010
Filed:
Nov. 21, 2005
Carsten Deppe, Aachen, DE;
Tom Munters, Hasselt, BE;
Carsten Deppe, Aachen, DE;
Tom Munters, Hasselt, BE;
Koninklijke Philips Electronics, N.V., Eindhoven, NL;
Abstract
A projection system and a method for operating a discharge lamp are described. The protection system comprises a discharge lampand driving electronics. The color wheelserves as color filter for filtering lightemitted from lampto generate a light sequencewith different colors in sequential color time periods. In between color time periods, spoke time periodsare arranged. The driving electronics provide a lamp current I with superimposed first current pulses, which are generated in at least one of the color time periods. In order to allow greater flexibility and be able to achieve stable arc operation and constant color point over lamp lifetime, the driving electronicsfurther provide second current pulses superimposed on the lamp current. The second current pulses are generated during at least one of the spoke time periods