Use of chiral dopant as additive to nematic base mixture contained in cholesteric liquid crystal mixture to reduce electrical switch field of a display for switching from planar to focal conic and focal conic to planar texture

摘要

Use of a chiral dopant with helical twisting power value of at least 22 mu m ->1>, as an additive to a nematic base mixture contained in cholesteric liquid crystal mixture for reducing electrical switch field of bistable displays filled with the liquid crystal mixture, to less than 3 V/mu m for switching from the planar to focal conic texture and to less than about 5.5 V/mu m for switching from focal conic into planar texture, based on the application of a bipolar square wave of 15 Hz to the conductive sides of the display, is claimed.