Abstract: The present disclosure is directed to optical devices including a light source and an optical film having a first surface disposed to receive light from the light source and a second surface facing away from the light source. The second surface includes a two-dimensional array of closely packed substantially hemispherically-shaped structures. In some implementations of the present disclosure, the optical film further includes a substrate portion having an optical characteristic different from optical characteristics of the second surface comprising the two dimensional array.
Type:
Grant
Filed:
December 30, 2004
Date of Patent:
August 26, 2008
Assignee:
3M Innovative Properties Company
Inventors:
Byung-Soo Ko, Leland R. Whitney, Dongwon Chae