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:
Dec. 07, 1999
Filed:
Sep. 02, 1998
Lynore M Abbott, New York, NY (US);
Michael M Wenyon, Boston, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A projection screen having a construction well-suited for effecting lateral color constancy in rear screen projection display systems is disclosed. The projection screen includes a holographic transmission diffuser element capable of diffusing a beam of light into a horizontally-elliptical cone and a light-collimating element for uniaxially-collimating by transmission an expanding wavefront with the axis of collimation substantially orthogonal to a horizontal viewing axis. The use of the projection screen in a rear screen projection display system including red, green and blue image projectors is also disclosed. A method of manufacturing a holographic projection screen by drawing a holographic transmission diffuser web and a uniaxial light collimating web into overlapping relationship and bonding the webs is also disclosed.