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:
Oct. 15, 2002
Filed:
Apr. 26, 2000
Applicant:
Inventors:
Andrew J. Piepel, Hudson, WI (US);
Robert S. Moshrefzadeh, Oakdale, MN (US);
Patrick A. Thomas, Maplewood, MN (US);
Thomas R. Gehring, Mahtomedi, MN (US);
Assignee:
3M Innovative Properties Company, Saint Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 2/160 ; G03B 2/156 ; G02B 2/710 ;
U.S. Cl.
CPC ...
G03B 2/160 ; G03B 2/156 ; G02B 2/710 ;
Abstract
A rear projection screen has one or more internal layers that reduce the speckle perceived by a viewer. A screen assembly has a light-source side and a viewing side. The assembly includes a screen layer to disperse light passing through the screen from the light source side and a matte surface disposed on the viewing side of the screen assembly to reduce ambient glare. A first speckle contrast reducing layer is disposed between the screen layer and the matte surface to reduce speckle formed at the matte surface.