Patent ID: 7619600
Filing Date: 2009-11-17
Classification: G02F,G09G

Abstract:
1. A driving method of a liquid crystal device for recording an image, the liquid crystal device comprising a liquid crystal layer comprising a cholesteric liquid crystal, a photoconductor layer accumulated on the liquid crystal layer, and electrodes disposed outside the liquid crystal layer and the photoconductor layer, the driving method comprising: an initializing step of making an entire liquid crystal layer to be a focal conic texture by applying between the electrodes a voltage that exceeds a threshold value of transition from a planar texture to a focal conic texture in the liquid crystal layer; a writing step of exposing the liquid crystal device imagewise while applying between the electrodes a voltage that does not exceeds a threshold value of transition from the focal conic texture to a homeotropic texture in the liquid crystal layer upon non-exposure but exceeds the threshold value upon exposure and that provides bistability of the focal conic texture and the homeotropic texture with hysteresis upon non-exposure; and a display fixing step of fixing a displayed image by releasing an application of voltage to change a part of the liquid crystal layer changed to the homeotropic texture to the planar texture.