Smectic liquid crystal high-contrast control or display device

摘要

The liquid-crystal switching or display device comprises a chiral smectic liquid-crystal mixture, where the ratio Delta/Theta of the angle between the rubbing direction and the smectic layer normal to the tilt angle in the liquid-crystal mixture is at least 0.41. Preferably, the liquid-crystal mixture has the phase sequence I-N-C and the tilt angle Theta at 25° C. is between 19° and 39°.