| CPC G02B 5/305 (2013.01) [G02B 27/283 (2013.01)] | 18 Claims |
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1. An optical system, comprising:
a first optical element comprising a curved first major surface; and
an optical stack formed into a curved shape, the optical stack bonded and conforming to the curved first major surface of the first optical element and comprising:
a reflective polarizer substantially transmitting light having a first polarization state and substantially reflecting light having an orthogonal second polarization state; and
a non-adhesive flexible optical layer bonded to the reflective polarizer prior to forming the optical stack into the curved shape, such that the non-adhesive flexible optical layer improves a desired optical property of the reflective polarizer upon forming the optical stack into the curved shape relative to that of the reflective polarizer being formed into the curved shape without the non-adhesive flexible optical layer, the non-adhesive flexible optical layer comprising substantially parallel opposing first and second major surfaces, at least one location on the non-adhesive flexible optical layer having an optical retardance of greater than about 200 nm at a wavelength of about 550 nm,
wherein the reflective polarizer comprises a plurality of interference layers, each interference layer reflecting or transmitting light primarily by optical interference, such that for substantially normally incident light in a predetermined wavelength range of from 400 nm to 700 nm, the plurality of interference layers comprising dichroic dye such that the plurality of interference layers has an average optical absorption of greater than about 2% for the second polarization state.
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