Optical film and light source with optical film

Abstract

The optical film 1 comprises a first liquid crystal layer 10 and a second liquid crystal layer 20 deposited on the first liquid crystal layer 10. When viewed from the thickness direction of the optical film 1, the optical film 1 includes a plurality of patterned regions 2 arranged in a direction perpendicular to the thickness direction. In each of the plurality of patterned regions 2, the liquid crystal compound of the second liquid crystal layer 20 is regularly oriented. The first liquid crystal layer 10 includes a liquid crystal compound that is twisted and oriented with the thickness direction of the optical film 1 as a helical axis. The second liquid crystal layer 20 is divided into a plurality of second liquid crystal segment layers 21.

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