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:
Mar. 09, 1993
Filed:
Oct. 05, 1990
Applicant:
Inventor:
Ian A Shanks, Buckinghamshire, GB;
Assignee:
Thorn EMI plc, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; G02F / ; G03B / ; G03B / ;
U.S. Cl.
CPC ...
359 53 ; 359 70 ; 359101 ; 359443 ; 352 86 ; 353 84 ;
Abstract
A screen for use in a front projection system includes a section capable of reflecting light of certain, predetermined wavelengths more than light of other wavelengths. The screen appears black or dark gray when viewed in broadband light. The screen provides for enhanced contrast between incident projected and ambient light. A projector for use with the screen has a light source capable of emitting the predetermined wavelengths.