US 12,442,965 B2
Optical film
Carl A. Stover, St. Paul, MN (US); Lin Zhao, Woodbury, MN (US); Gilles J. Benoit, Minneapolis, MN (US); and Robert D. Taylor, Stacy, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/996,695
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed May 3, 2021, PCT No. PCT/IB2021/053687
§ 371(c)(1), (2) Date Oct. 20, 2022,
PCT Pub. No. WO2021/224760, PCT Pub. Date Nov. 11, 2021.
Claims priority of provisional application 62/704,400, filed on May 8, 2020.
Prior Publication US 2023/0273359 A1, Aug. 31, 2023
Int. Cl. G02B 5/30 (2006.01)
CPC G02B 5/305 (2013.01) 15 Claims
OG exemplary drawing
 
1. A optical film comprising a plurality of polymeric layers arranged along at least a portion of a thickness of the optical film, each polymeric layer having an average thickness less than about 300 nm, the plurality of polymeric layers comprising a first polymeric layer having a largest average thickness among the plurality of polymeric layers, and a second polymeric layer disposed between a third polymeric layer and the first polymeric layer, the first and second polymeric layers separated by N1 polymeric layers, 2≤N1≤10, the second and third polymeric layers separated by N2 polymeric layers, N2≥10, the first, second and third polymeric layers having respective average thicknesses t1, t2 and t3, t1 greater than t2 by at least 10%, t2 greater than t3 by at most 2%.