Abstract

We propose a twisted nematic liquid crystal device that can be operated in dynamic or memory mode, based on the information content to be displayed at that time. +90°-twisted and 90°-twisted states are used as two stable states for operation in the memory mode. A vertical electric field is applied to realize gray levels for operation in the dynamic mode. The proposed device has a memory retention time of over a month for the memory mode and a response time of 12ms for the dynamic mode. Contrast ratios of over 5001 can be obtained in both the dynamic and memory modes.

© 2011 Optical Society of America

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