US 12,474,515 B2
Optical stack and display
Takashi Fujita, Kanagawa (JP); Hideaki Shirotori, Kanagawa (JP); Chikara Abe, Yamagata (JP); Matthew B. Johnson, Woodbury, MN (US); Brianna N. Wheeler, Bloomington, MN (US); and Adam D. Haag, Woodbury, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/780,581
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 8, 2020, PCT No. PCT/IB2020/061664
§ 371(c)(1), (2) Date May 27, 2022,
PCT Pub. No. WO2021/130580, PCT Pub. Date Jul. 1, 2021.
Claims priority of provisional application 62/952,609, filed on Dec. 23, 2019.
Prior Publication US 2023/0350119 A1, Nov. 2, 2023
Int. Cl. G02B 5/30 (2006.01)
CPC G02B 5/305 (2013.01) 13 Claims
OG exemplary drawing
 
1. An optical stack comprising:
a reflective polarizer comprising a plurality of interference layers; and
an absorbing polarizer disposed on and substantially co-extensive with the reflective polarizer, such that for a substantially normally incident light and for at least a first wavelength between about 450 nm and about 670 nm:
each interference layer reflects or transmits light primarily by optical interference;
the plurality of interference layers transmits at least about 85% of the incident light having a first polarization state, reflects at least about 80% of the incident light having an orthogonal second polarization state, and transmits less than about 0.1% of the incident light having the second polarization state;
the absorbing polarizer has a first optical transmittance for the first polarization state, an optical absorption greater than about 50% for the second polarization state, and a second optical transmittance for the second polarization state, an average of the first and second optical transmittances greater than about 0.46, the second optical transmittance having a first standard deviation across at least 80% of the absorbing polarizer, the first standard deviation greater than about 0.004; and
the optical stack has an optical transmittance for the second polarization state having a second standard deviation across at least 80% of the optical stack, the second standard deviation less than about 0.001.