Drive schemes for gray scale bistable reflective cholesteric liquid crystal displays

摘要

A series of drive schemes (20) are used to apply a single phase of at least one voltage pulse to drive a display (10) with a bistable cholesteric liquid crystal material to a gray scale reflectance. Each drive scheme takes into consideration the initial texture of the cholesteric material and the range of voltages (V1......V6) that may be applied between maximum and minimum reflectance of the material. Application of the single phase can be implemented by either time modulation or amplitude modulation.