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. 09, 2014
Filed:
Dec. 08, 2009
Tzu-chen Lee, Woodbury, MN (US);
David A. Ender, New Richmond, WI (US);
Guoping Mao, Woodbury, MN (US);
Jun-ying Zhang, Woodbury, MN (US);
Jaime B. Willoughby, Hugo, MN (US);
Tzu-Chen Lee, Woodbury, MN (US);
David A. Ender, New Richmond, WI (US);
Guoping Mao, Woodbury, MN (US);
Jun-Ying Zhang, Woodbury, MN (US);
Jaime B. Willoughby, Hugo, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Lightguides, devices incorporating lightguides, processes for making lightguides, and tools used to make lightguides are described. A lightguide includes light extractors arranged in a plurality of regions on a surface of the lightguide. The orientation of light extractors in each region is arranged to enhance uniformity and brightness across a surface of the lightguide and to provide enhanced defect hiding. The efficiency of the light extractors is controlled by the angle of a given light extractor face with respect to a light source illuminating the light guide.