Patent ID: 8730559

Claim:
A multicolor display optical composition comprising a light transmissive dispersion medium, a periodic structure arranged in the dispersion medium and having a porous structure inside communicated with the outside, and mobile particles contained in the dispersion medium so as to be movable and having a volume average primary particle diameter of 1 nm or larger and 80 nm or smaller in a dispersion state in the dispersion medium, a volume average particle diameter of coagulated particles of 100 nm or larger in optical coagulation state by applying a stimulus, wherein the mobile particles show no coloration in the dispersion state when the particles are dispersed in the dispersion medium, and show white coloration with a predetermined whiteness value or higher by light scattering in the coagulation state when the particles are coagulated, and a refractive index of the coagulated particles of the mobile particles is different from a refractive index of the dispersion medium by 0.2 or more.