firstly read this http://studentbank.in/topic-Seminar-Instructions

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Reflective cholesteric liquid crystal display (Ch-
LCD)[1] is a bistable device which consumes less power
than the general reflective STN or TFT displays, Due to its
bistability. the driving voltage is required when refreshing
the screen. This power saving feature is especially
important for reading books or magazines. An ordinary
people may take 2-3 minutes to finish reading a page. Thus,
Ch-LCD is a strong contender for electronic newspaper or
books.