US 11,940,689 B2
High transmission light control film
Daniel J. Schmidt, Woodbury, MN (US); Kevin W. Gotrik, Hudson, WI (US); Nicholas A. Johnson, Burnsville, MN (US); Raymond J. Kenney, Woodbury, MN (US); Caleb T. Nelson, McKinney, TX (US); and Kenneth A. Epstein, St. Paul, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed on Dec. 12, 2022, as Appl. No. 18/064,644.
Application 18/064,644 is a continuation of application No. 17/264,512, granted, now 11,550,183, previously published as PCT/IB2019/056489, filed on Jul. 30, 2019.
Claims priority of provisional application 62/713,462, filed on Aug. 1, 2018.
Prior Publication US 2023/0109003 A1, Apr. 6, 2023
Int. Cl. G02F 1/1335 (2006.01); G02B 5/00 (2006.01); G02B 5/30 (2006.01)
CPC G02F 1/133524 (2013.01) [G02B 5/003 (2013.01); G02B 5/305 (2013.01); G02B 2207/123 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A light control film comprising:
a light input surface and a light output surface opposite the light input surface;
alternating transmissive regions and absorptive regions disposed between the light input surface and the light output surface, wherein the absorptive regions comprise a core having a first extinction coefficient, k1, sandwiched between cladding layers having a second extinction coefficient, k2, wherein k2<k1, and wherein the cores have an aspect ratio of at least 20,
wherein the core comprises 30 wt. % to 100 wt. % of a light absorbing material and the cladding layers comprise 0.5 wt. % to 50 wt. % of the light absorbing material.