| 摘要 |
PURPOSE:To obtain excellent orientation and high contrast by rendering the transition of an antiferroelectric liquid crystal material from a liquid state at high temp. to a smectic-A phase at low temp. as the second-order transition. CONSTITUTION:A transparent electrode 5, an insulating film 3 and an oriented film 4 are formed on each of upper and lower substrates 1, 2. The oriented films 4 are formed by applying a mixture soln. of polyimide diluted with (N- methyl-2-pyrrolidone) NMP, baking, and subjecting to parallel rubbing treatment in the same direction for both substrates. The liquid crystal material to be supplied to the cell is prepared by mixing an antiferroelectric liquid crystal compsn. (A) and an antiferroelectric liquid crystal (B). The compsn. (A) has such a phase series as, from a high temp. state, liquid (ISO) smectic-A phase (SmA) ferroelectric liquid crystal phase (SmC*) antiferroelectric liquid crystal phase (SmCA*). The liquid crystal compsn. (B) has the phase series, from a high temp. state, liquid (ISO) chiral nematic phase (N*) * smectic-A phase (SmA) antiferroelectric liquid crystal (SmCA*). By increasing the mixing ratio of the compsn. (B), the oriented state is improved. |
