Abstract
In this paper we describe methods to control liquid crystal (LC) alignment
using plasma discharge on ferroelectric fluoropolymers. Two different plasma
modification techniques were investigated: corona discharge and RF plasma
in Ar gas. Corona discharge is a proven technique known to reorient the dipoles
in poly (vinylidene fluoride) and its copolymers resulting in a strong remnant
polarization. The polarization was patterned resulting in preferential LC
alignment in selected regions. RF plasma in Ar gas defluorinates the polymer
surface leading to planar alignment of positive dielectric anisotropy LCs.
The defluorination of the alignment layer also causes low voltage switching
of the LC.
© 2008 IEEE
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