Optical film and method of producing same
AssigneeFUJIFILM Corporation
InventorsYukito SAITOH, Daisuke KASHIWAGI
Life of this patent
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Abstract
The optical film is an optical film including a cholesteric liquid crystal layer, in which first regions having a first film thickness and second regions having a second film thickness which is smaller than the first film thickness are alternately arranged with a period P of 0.5 μm to 2.0 μm in at least one direction in a plane, a difference in film thickness between the first film thickness and the second film thickness is in a range of 0.2 μm to 1.0 μm, and a helical pitch of a cholesteric phase in the first region is different from a helical pitch of a cholesteric phase in the second region.
Claims11
An optical film comprising:
- a cholesteric liquid crystal layer,
- wherein the cholesteric liquid crystal layer is formed such that first regions having a first film thickness and second regions having a second film thickness which is smaller than the first film thickness are alternately arranged with a period P of 0.5 μm to 2.0 μm in at least one direction in a plane,
- a difference in film thickness between the first film thickness and the second film thickness is in a range of 0.2 μm to 1.0 μm, and
- a helical pitch of a cholesteric liquid crystal in the first region is different from a helical pitch of a cholesteric liquid crystal in the second region.
Dependencies are inferred from the claim text.