CPC G02B 5/3041 (2013.01) [G02B 5/3016 (2013.01); C09K 2323/03 (2020.08); C09K 2323/031 (2020.08); C09K 2323/035 (2020.08)] | 15 Claims |
1. A film stack, comprising:
a plurality of first films and a plurality of second films alternately stacked,
wherein at least one second film of the plurality of second films includes a solid crystal including crystal molecules aligned in a predetermined alignment direction,
wherein at least one first film of the plurality of first films includes an alignment structure configured to at least partially align the crystal molecules of the solid crystal in the predetermined alignment direction, and
wherein an in-plane optical anisotropy of the at least one second film is at least 0.5.
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