Dual-mode operation of a twisted nematic liquid crystal cell by switching between dynamic and memory modes |
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Authors: | Song Dong Han Kim Ki-Han Kim Jung-Wook Kim Jae Chang Yoon Tae-Hoon |
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Affiliation: | School of Electrical Engineering, Pusan National University, Busan 609-735, South Korea. |
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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 12 ms for the dynamic mode. Contrast ratios of over 500∶1 can be obtained in both the dynamic and memory modes. |
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