Abstract
In this paper, we report the effect of the electron beam irradiation
on various display parameters (threshold voltage, anisotropy of the relative
dielectric permittivity, splay elastic constant, switching voltage and hence,
steepness of the transmission voltage curve) of a room temperature twisted
nematic display material, namely 4-(trans-4'-hexylcyclohexyl) isothiocyanatobenzoates
(6CHBT). It has been observed that various display parameters of 6CHBT improve
significantly up to an optimum dose of the electron beam irradiation, whereas
further higher doze of irradiation causes deterioration. UV-Vis and Fourier
transform infra red (FTIR) spectroscopy have been used to estimate the changes
at molecular level responsible for the change in the bulk properties of the
sample.
© 2009 IEEE
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