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. 13, 1982
Filed:
Aug. 02, 1979
Applicant:
Inventor:
Andrew L Dalisa, Cupertino, CA (US);
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
350362 ; 350361 ; 372 24 ;
Abstract
Projection display devices and/or remote blackboard systems are provided with electrophoretic type cells used to control the projected light source. Light is directed toward the EPID cell through a total internal reflecting type prism, and reflected light from a totally internal reflecting surface at the interface of the cell and prism is projected to a viewing device. By writing information into the EPID type cell, total internal reflection can be frustrated and an image is formed at the viewing device. Information may be written into the EPID type device by a scaning laser, or by an electrostatic writing instrument.