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. 06, 2004
Filed:
Jun. 12, 2002
Adrianus Johannes Stephanes Maria De Vaan, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A projection device comprises a projector ( ) for providing a light beam ( ) to be projected in polarized light. A adjustable liquid crystal element ( ) for changing the direction of polarization is arranged between the projector ( ) and the transmissive projection screen ( ). The transmissive projection screen ( ) comprises a polarizing diffusion layer ( ). The extent of changing the direction of polarization by the adjustable liquid crystal element ( ) for changing the direction of polarization is adjustable. The extent of changing the direction of polarization and hence the extent of diffusion in the transmissive projection screen ( ) is adjustable by way of adjusting the voltage from a voltage source which is coupled to the adjustable liquid crystal element ( ) for changing the direction of polarization.