CHOLESTERIC LIQUID CRYSTAL DISPLAY DEVICE

摘要

A cholesteric liquid crystal display device has a cell comprising a layer of cholesteric liquid crystal material and an active matrix addressing arrangement. The active matrix addressing arrangement is used to drive the liquid crystal material into the planar state and the homeotropic state. To achieve grey levels, the active matrix addressing arrangement is scanned with a plural number of scans (50) in each video period TF and the relative time during which the pixels are driven into the planar and homeotropic states is controlled in accordance with the image data (51, 52).