Abstract
Writable cholesteric liquid crystal display (ChLCD) and the algorithm
used to detect its image were developed. A hard tip such as the fingertip
could be used to draw an image onto the surface of ChLCD. Two states i.e.,
focal conic state (dark state) as F-state, and planar state (bright state)
as P-state were designated in this paper. F-state or P-state could be detected
by measuring the capacitance of one pixel of test cell (12 mm$\times $15 mm/1$\times $1). However, it could not be
detected using the same method on a ${\hbox{4.1}}'$ ChLCD (241 $\mu$m$\times $241 $\mu$m/320$\times $320) due to the effect of parasitic capacitance. The reason why
we measured capacitances and detected F-state or P-state was to look for a
method which could be applied to detect the drawn image on ChLCD. By using
a writable ChLCD, a user should be able to draw an image on it, and then detect
and save the drawn image. Therefore, the high frequency measurement and the
algorithm were developed to detect the image on ChLCD. Moreover, color writable
ChLCD was also introduced.
© 2009 IEEE
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