Abstract
The effects of molecular configuration and driving architecture
on the electro-optical properties of cholesteric liquid crystal (ChLC)
displays are demonstrated. Two kinds of ChLC cells, composed by mixing
the chiral dopant with the positive nematic LC (P-ChLC cell) and with
the negative nematic LC (N-ChLC cell), are fabricated in order to
make a detailed investigation. Compared with the conventional P-ChLC
cell driven by the uniform vertical electric fields, the N-ChLC cell
driven by the in-plane switching electric fields shows a higher output
light transmittance and a more stable helical molecular configuration,
which is attributed to the fact that the focal conic configuration
does not exist in the N-ChLC cell. In addition, via the three-terminal-electrode
driving architecture, a faster switching response (5.2 ms) of the
N-ChLC cell at a low driving voltage is successfully achieved. This
study not only exhibits the difference in the electro-optical properties
of the P-ChLC and N-ChLC cells, but also provides a driving method
for the N-ChLC cell to enhance its electro-optical performance, which
is beneficial to the development of fast dynamic optical devices.
© 2015 IEEE
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