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36.3: A Faster Switching Regime for Zenithal Bistable Nematic Displays
Author(s) -
Rudin J. C.
Publication year - 1998
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1833932
Subject(s) - bistability , liquid crystal , homeotropic alignment , pulse width modulation , dielectric , pulse (music) , coupling (piping) , materials science , energy (signal processing) , relaxation (psychology) , optics , switching time , voltage , optoelectronics , physics , psychology , social psychology , quantum mechanics , detector , metallurgy
A simpler and faster switching regime for Zenithal Bistable Nematic displays is reported. A cell, based on homeotropic alignment of nematic liquid crystal over a continuous blazed monograting on one surface, can be switched using bipolar pulses an order of magnitude faster than monopolar pulses of the same voltage. We propose that this regime relies on simple dielectric coupling to drive the cell into a higher energy state with a long pulse time, and the relaxation into a lower energy state after the creation of surface defects from a shorter applied pulse. Although flexoelectric effects are observed, they do not form the basis of state selection as was proposed for the monopolar pulses.