▎ 摘　　要

NOVELTY - The method involves generating a graphene film on a substrate by adopting chemical vapor deposition method for obtaining a graphene substrate. The graphene substrate is bonded with two pieces. The graphene substrate is separated by spacers to obtain a liquid crystal box. Chiral compound is added in nematic liquid crystal to prepare a cholesteric liquid crystal in liquid crystal orientation process. View range of the graphene film is obtained to induce cholesteric liquid crystal with large area orientation by cooling liquid crystal material in a liquid crystal box at room temperature. USE - Method for inducing cholesteric liquid crystal with large area orientation and realizing wide viewing angle in a graphene film. ADVANTAGE - The method enables simplifying the preparation process and reducing product cost. DESCRIPTION OF DRAWING(S) - The drawing shows a photograph of a graphene film.