Patent ID: 8808945

Claim:
A fabrication process for a cholesteric liquid crystal medium having a volume hologram, which has a double-layer structure of a volume hologram layer and a cholesteric liquid crystal layer, characterized by comprising steps of: forming a volume hologram layer on a first substrate; forming a cholesteric liquid crystal layer on said volume hologram layer by coating a liquid crystalline composition followed by orienting and curing; peeling said first substrate off; forming an adhesive layer on a surface of said volume hologram layer, off which said first substrate has been peeled; and providing a second substrate on said adhesive layer wherein no layer or film exists between the volume hologram layer and the cholesteric liquid crystal layer, wherein the liquid crystalline composition includes a polymerizable liquid crystal material of nematic order, a chiral agent and photopolymerization initiators and wherein the chiral agent is incapable of polymerization, has a MW of 1500 or less and is selected from either a compound having at least one asymmetric carbon atom or a compound having an optically active site having axial symmetry.