Patent ID: 7145538
Filing Date: 2006-12-05
Classification: G09G

Abstract:
1. A method for driving a liquid crystal display by applying AC pulses to a liquid crystal layer, which comprises liquid crystal which exhibits a cholesteric phase having a selective reflection characteristic, through a plurality of scan electrodes and a plurality of data electrodes, in which the scan electrodes are selected for scanning successively at specified time intervals, and an image is formed on the liquid crystal display by switching liquid crystal between a focal-conic state and a planar state, said method comprising: a reset step of applying a reset pulse, which is to reset liquid crystal of the liquid crystal layer to a homeotropic state, to an area of the liquid crystal layer that corresponds to a selected one of the scan electrodes; a selection step of applying a selection pulse, which is to select a final state of the liquid crystal, to the area of the liquid crystal layer after the reset step, said final state of the liquid crystal being either a focal-conic state or a planar state; and an evolution step of applying an evolution pulse, which is to cause the liquid crystal to evolve to the selected final state, to the area of the liquid crystal layer; wherein,