Patent ID: 7719501
Filing Date: 2010-05-18
Classification: G02F,G09G

Abstract:
1. A distinct color LCD apparatus including: at least one layer of encapsulated cholesteric liquid crystal material; electrically conductive means for addressing a plurality of parallel addresses across the encapsulated cholesteric liquid crystal material in the at least one layer; and an electrical pulse driving means connected to said electrically conductive means and arranged to supply drive signals to the plurality of parallel addresses to drive the cholesteric liquid crystal material selectively into a homeotropic state or a planar state, the electrical pulse driving means being arranged to supply drive signals which provide a predetermined grey level by driving the cholesteric liquid crystal material, within successive frames each having a predetermined time period which is sufficiently short that an average reflectance of the color LCD apparatus over the predetermined time period is perceived without the appearance of visual flicker, into homeotropic state in a fraction of said predetermined time period and into the planar state in the remainder of said predetermined time period, said fraction being selected in accordance with the grey level.