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1. (WO1998050806) BRIGHTNESS ENHANCEMENT ARTICLE

Pub. No.:    WO/1998/050806    International Application No.:    PCT/US1998/009278
Publication Date: Fri Nov 13 00:59:59 CET 1998 International Filing Date: Thu May 07 01:59:59 CEST 1998
IPC: G02B 5/04
Applicants: MINNESOTA MINING AND MANUFACTURING COMPANY
Inventors: FONG, Bettie, C.
KRETMAN, Wade, D.
KOTCHICK, Keith, M.
COBB, Sanford, Jr.
MILLER, Richard, A.
WILLIAMS, Todd, R.
TOYOOKA, Kazuhiko
Title: BRIGHTNESS ENHANCEMENT ARTICLE
Abstract:
A brightness enhancement article that includes: (a) a transparent, flexible substrate; (b) a first major surface having an array of prisms with blunted or rounded peaks characterized by a chord whidth, cross-sectional pitch width, and radius of curvature in which the chord width is equal to about 20-40 % of the cross-sectional pitch width and the radius of curvature is equal to about 20-50 % of the cross-sectional pitch width; and (c) a second major surface characterized by a plurality of light scattering protrusions. The article has a haze value between about 20-60 % and a transmission value no greater than about 94 % when measured under conditions in which the first surface has a substantially planar topography.