30.1: A New Drive Scheme for Cholesteric Reflective Displays Under Active Matrix Addressing

A novel drive scheme for reflective cholesteric active matrix displays is proposed. This method is composed of two stages, a fast resetting phase which drives the cholesteric to the homeotropic state and a determining phase where different voltages are applied in order to get different gray levels o...

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Bibliographic Details
Published in:SID International Symposium Digest of technical papers 2011-06, Vol.42 (1), p.392-395
Main Authors: Zola, Rafael S., Yang, Young-Cheol, Yang, Deng-Ke, Chen, Heng-Yin, Hsu, Chien-Chih, Chen, Chih-Jen, Liang, Chao-Chiun, Cheng, Kung-Lung
Format: Article
Language:English
Subjects:
active matrix
Cholesteric reflective liquid crystals
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Summary:A novel drive scheme for reflective cholesteric active matrix displays is proposed. This method is composed of two stages, a fast resetting phase which drives the cholesteric to the homeotropic state and a determining phase where different voltages are applied in order to get different gray levels of reflectance. When the determining voltage is low, a bright high reflective planar state is achieved while when the voltage is high, a dark focal conic state is formed. We experimentally demonstrated that the drive scheme works well for video ratio operation.
ISSN:0097-966X
2168-0159
DOI:10.1889/1.3621333