▎ 摘　　要

NOVELTY - Optical device comprises upper electrode (110) disposed on one surface of the upper substrate (300), lower substrate spaced apart from the upper substrate, lower electrode (120) disposed on one surface of the lower substrate (400) and a graphene oxide cell (200) disposed between the upper substrate and the lower substrate. The graphene oxide cell is formed by dispersing graphene oxide in a solvent and is capable of reflecting light of a specific wavelength by a photonic crystal structure. USE - Optical device. ADVANTAGE - The optical device arbitrarily controls the graphene oxide arrangement with the electric field and controls the reflectivity of the light reflected in the graphene oxide cell. DETAILED DESCRIPTION - Optical device comprises upper electrode (110) disposed on one surface of the upper substrate (300), lower substrate spaced apart from the upper substrate, lower electrode (120) disposed on one surface of the lower substrate (400) and a graphene oxide cell (200) disposed between the upper substrate and the lower substrate. The graphene oxide cell is formed by dispersing graphene oxide in a solvent and is capable of reflecting light of a specific wavelength by a photonic crystal structure. The method for controlling optical display involves controlling the reflectance of light reflected from the graphene oxide cell by controlling an alternating voltage applied to the upper electrode unit and the lower electrode unit. An alternating voltage is applied to have an electric field perpendicular to the upper substrate and the lower substrate to control the reflectance of the graphene oxide cell to have an electric field parallel to the upper substrate and the lower substrate. DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of optical device. Upper electrode (110) Lower electrode (120) Graphene oxide cell (200) Upper substrate (300) Lower substrate (400)