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. 28, 2004
Filed:
Sep. 06, 2002
Paulus Bartholomeus Johannes Schaareman, Eindhoven, NL;
Theodoor Bastiaan Johannes Haddeman, Eindhoven, NL;
Franciscus Guillaume Peter Sools, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The invention relates to a projection display device having an illumination system comprising a light source and an optical system for providing an illumination beam. The projection display device is further provided with an image display system for modulating the illumination beam with image information and projecting an image on a screen. In order to filter ultra-violet and infra-red radiation from the light source, a filter means is present which transmit visible light. Cooling means comprising a cooling liquid are present for cooling the filter means. In the projection display device, the filter means comprises the cooling liquid which contains a radiation-absorbent additive for absorbing the ultra-violet and infra-red radiation.