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. 15, 2010
Filed:
Nov. 17, 2005
Norihisa Moriya, Tokyo-to, JP;
Norihisa Moriya, Tokyo-to, JP;
Dai Nippon Printing Co., Ltd., Tokyo-to, JP;
Abstract
Provided is a projection system capable of obtaining a sharp contrast without being influenced by an ambient light, the projection system including a projection screen, containing a substrate and a polarized light selective-reflection layer formed on the substrate that diffuse-reflects right-handed circularly polarized light or left-handed circularly polarized light. An image is displayed by reflecting an image light irradiated from a projector on the projection screen. An external light screen is installed at an external light entrance and disposed in a sequence of a linearly polarizing plate and a retardation plate from an external side, and the external light screen circularly polarizes a light in reverse direction to the circularly polarized light diffuse-reflected by the polarized light-selective reflection layer. A transmission axis of the linearly polarizing plate is in a horizontal direction.