Abstract
This paper investigates the voltage hysteresis effect
and residual birefringence in the polymer-stabilized blue phase I and II,
under various phase separation conditions. By irradiating samples with ultraviolet
(UV) light and curing the samples at a reduced temperature, the polymer in
the blue phase formed a compact network along the direction of the UV light
irradiation. The dense polymer network pinned the cubic lattice structure
of the blue phase enabling it to return to its original optical isotropic
state. In this manner, hysteresis and residual birefringence were suppressed
from 4.16% to 1.67% and 0.057% to 0.002%, respectively. Although the driving
voltage remained high, the reduction in hysteresis and residual birefringence
are precisely the advancements required for the accelerating development of
blue-phase liquid crystal displays.
© 2011 IEEE
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