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:
Oct. 24, 2006
Filed:
May. 21, 2002
Applicants:
Harald Glaeser, Aachen, DE;
Hans-helmut Bechtel, Roetgen, DE;
Dietrich Bertram, Aachen, DE;
Inventors:
Assignee:
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F 1/1335 (2006.01); F21V 5/00 (2006.01); F21V 5/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a liquid crystal picture screen provided with a background lighting system which comprises at least one light source and a collimator formed by hourglass-shaped microprisms. The light of the light source can be effectively collimated within a desired angular range by means of the collimator.