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|1. (WO2018178817) OPTICAL SYSTEM|
|Applicants:||3M INNOVATIVE PROPERTIES COMPANY
|Inventors:||STEINER, Michael L.
OUDERKIRK, Andrew J.
WONG, Timothy L.
ETTER, Jo A.
BENOIT, Gilles J.
LE, John D.
MCDOWELL, Erin A.
An optical system including one or more optical lenses, at least one retarder layer, a reflective polarizer, and a partial reflector is provided. The at least one retarder layer may include first and second retarder layers having different wavelength dispersion curves. The at least one retarder layer may include a first retarder layer having a non-uniform fast axis orientation and/or a non-uniform retardance.