DIBENZOFURAN DERIVATIVES, DIBENZOTHIOPHENE DERIVATIVES, AND FLUORENE DERIVATIVES

摘要

The present invention relates to all-optical display element containing a liquid crystal medium to use as a component in the compounds, those of the liquid crystal medium of the formula I, and the present invention: ; Formula (I) ; Wherein ^{R, Y, X 1, X 2} , X 3, R 1, R 2, A 1, A 2, Z 1, Z 2, m and n are as defined in claim 1 of the claims.