Patent ID: 6549327
Filing Date: 2003-04-15
Classification: C07D,G02B

Abstract:
A display comprising an arrangement of a plurality of optically anisotropic rotatable elements, each of said rotatable elements having a surface in contact with an enabling fluid, said rotatable elements being electrically dipolar in the presence of the enabling fluid and thus being subject to rotation upon application of an electric field, said rotatable elements being free to rotate in place but not free to translate substantially so as to disrupt the arrangement of rotatable elements, wherein a first portion of said surface contains a mixture of a chelating agent and a spiropyran material of the formula wherein n is an integer representing the number of repeat â€”CH2â€” units and R is â€”H or â€”CH&boxH;CH2, and wherein a second portion of said surface contains substantially no spiropyran.