Optical: systems and elements – Projection screen – With reflector or additional screen
Reexamination Certificate
2005-11-17
2010-06-15
Mahoney, Christopher (Department: 2862)
Optical: systems and elements
Projection screen
With reflector or additional screen
C353S020000, C362S019000, C349S005000
Reexamination Certificate
active
07738170
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.
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USPTO Office Action mailed May 27, 2009 for co-pending U.S. Appl. No. 11/281,285.
USPTO Office Action mailed Aug. 6, 2008 for co-pending U.S. Appl. No. 11/281,285.
Dai Nippon Printing Co. Ltd.
Ladas & Parry LLP
Mahoney Christopher
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