Patent ID: 6154190
Filing Date: 2000-11-28
Classification: G02F,G09G

Abstract:
A method of addressing a bistable chiral nematic liquid crystal material disposed between electrodes arranged on opposed sides of said liquid crystal and adapted to selectively apply an electric field through said liquid crystal material, said method comprising the steps of:energizing said electrodes to establish a preparation voltage across said liquid crystal during a preparation phase;energizing said electrodes to establish a post-preparation voltage across said liquid crystal during a post-preparation phase;energizing said electrodes to establish a selection voltage across said liquid crystal during a selection phase for selecting a selection state which evolves into one of two final display states for said liquid crystal; andenergizing said electrodes to establish an evolution voltage across said liquid crystal during an evolution phase and creating an evolution state which changes to one of two final display states after completion of the addressing method, wherein said final display states remain indefinitely until said energizing steps are repeated.