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:
Feb. 25, 2020
Filed:
Apr. 12, 2013
3m Innovative Properties Company, St. Paul, MN (US);
Gary T. Boyd, Woodbury, MN (US);
Qingbing Wang, Woodbury, MN (US);
Tri Dinh Pham, Woodbury, MN (US);
Connie L. Johnson, River Falls, WI (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A microreplicated optical film () for use in optical displays, backlights, and the like includes a prismatic layer () carried by a substrate (). In use, the optical film may be combined in a system with other components such that the optical film is positioned between an extended light source () and a polarizer (). In such cases, if the substrate has an appreciable birefringence, a subtle but characteristic colored pattern known as substrate color mura (SCM) may be detected by a user of the system. To reduce or eliminate the SCM with little or no adverse effect on brightness enhancement capabilities of the optical film, the optical film may include an embedded structured surface () between the substrate and the prismatic layer. In order to avoid another optical artifact known as sparkle, at least 80% of the embedded structured surface is preferably occupied by features such as defocusing lenslets or random planar facets.