US 12,313,864 B2
High transmission light control film comprising alternating transmissive and absorptive regions
Tao Liu, Woodbury, MN (US); Nicholas A. Johnson, Woodbury, MN (US); Raymond J. Kenney, Woodbury, MN (US); Caleb T. Nelson, McKinney, TX (US); and Daniel J. Schmidt, Woodbury, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/757,743
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 18, 2020, PCT No. PCT/IB2020/062226
§ 371(c)(1), (2) Date Jun. 20, 2022,
PCT Pub. No. WO2021/130637, PCT Pub. Date Jul. 1, 2021.
Claims priority of provisional application 62/952,755, filed on Dec. 23, 2019.
Prior Publication US 2023/0028958 A1, Jan. 26, 2023
Int. Cl. G02B 5/00 (2006.01); G02B 1/04 (2006.01); G02B 5/28 (2006.01); G02B 5/30 (2006.01)
CPC G02B 5/003 (2013.01) [G02B 1/04 (2013.01); G02B 5/28 (2013.01); G02B 5/3033 (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; and
TIR cladding layers, the TIR cladding layer having a refractive index, nTIR, and an extinction coefficient, KTIR;
wherein the transmissive regions alternate between high refractive index transmissive regions having a refractive index, n2, and low refractive index transmissive regions having a refractive index, n1,
wherein the absorptive regions comprise a core having a refractive index, ncore, and an extinction coefficient, kcore, adjacent an AR cladding layer, the AR cladding layer having a refractive index, nAR, and an extinction coefficient, KAR;
wherein n1<n2;
wherein nTIR<n2;
wherein the TIR cladding layers are adjacent the high refractive index transmissive regions;
wherein the cores have an aspect ratio of at least 20; and
wherein the high refractive index transmissive regions have a wall angle of 6 degrees or less.