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. 04, 2007
Filed:
Sep. 23, 2002
Hendrik Johannes Boudewijn Jagt, Eindhoven, NL;
Cees Bastiaansen, Montfort, NL;
Hugo Johan Cornelissen, Eindhoven, NL;
Dirk Jan Broer, Eindhoven, NL;
Hendrik Johannes Boudewijn Jagt, Eindhoven, NL;
Cees Bastiaansen, Montfort, NL;
Hugo Johan Cornelissen, Eindhoven, NL;
Dirk Jan Broer, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A multi-layered arrangement according to the invention provide emission of polarized light. At least one of the interfacing surfaces between the layers is provided with a microstructure. In one embodiment, a first layer in the form of a lightguide substrate () receives unpolarized light from a lamp (). A birefringent second layer () is provided with a microstructure () in the form of parallel grooves. On top of the birefringent layer a third layer (), i.e. a coating layer, is located. Light is outcoupled by way of selective Total Internal Reflection, TIR, at the micro-structured surface of the birefringent layer, yielding a highly linearly polarized emission at near normal angles. The polarized light may be emitted out through the coating or in an opposite direction through the lightguide, which in an advantageous manner allow any configuration of transmissive (backlight), transflective (backlight) or reflective (frontlight) display arrangement.