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:
Sep. 03, 2013
Filed:
May. 19, 2008
Timothy J. Nevitt, Red Wing, MN (US);
Timothy J. Hebrink, Scandia, MN (US);
Michael F. Weber, Shoreview, MN (US);
Rolf W. Biernath, Wyoming, MN (US);
David G. Freier, St. Paul, MN (US);
John A. Wheatley, Lake Elmo, MN (US);
Andrew J. Ouderkirk, Singapore, SG;
Charles D. Hoyle, Stillwater, MN (US);
Kristopher J. Derks, Woodbury, MN (US);
Timothy J. Nevitt, Red Wing, MN (US);
Timothy J. Hebrink, Scandia, MN (US);
Michael F. Weber, Shoreview, MN (US);
Rolf W. Biernath, Wyoming, MN (US);
David G. Freier, St. Paul, MN (US);
John A. Wheatley, Lake Elmo, MN (US);
Andrew J. Ouderkirk, Singapore, SG;
Charles D. Hoyle, Stillwater, MN (US);
Kristopher J. Derks, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
An edge-lit backlight comprises a front and back reflector forming a hollow light recycling cavity having a cavity depth H and an output region of area Aout, and one or more light sources disposed proximate a periphery of the backlight to emit light into the light recycling cavity. The light sources have an average plan view source separation of SEP collectively having an active emitting area Aemit, wherein a first parameter equals Aemit/Aout and a second parameter equals SEP/H. The first parameter is in a range from 0.0001 to 0.1, and by the second parameter is in a range from 3 to 10. The front reflector has a hemispherical reflectivity for unpolarized visible light of R, and the back reflector has a hemispherical reflectivity for unpolarized visible light of R, and R*Ris at least 0.70.