We report wide temperature range blue phase liquid crystals for display applications.
Systematical analysis of the relationship of dielectric anisotropy value (Δε) and the blue phase liquid
crystal (BPLC) temperature range shows that the BP temperature range increases as the Δε decrease.
Additionally, we also find that as the chiral concentration of the blue phase increases, the BP
temperature range decreases. The studied BPLCs also exhibit fast response time of 400 μs using IPS
cells with a fixed cell gap and electrode line and space of 10 μm. These results can be explained
based on the defect theory and would give effective guidance during the application of BPLC.
Detailed physical, optical, dielectric and electro-optical study will be presented.
We demonstrate fast-switching electro-optical films (EOFs) based on polymer encapsulated liquid crystal and carbon
nanotube. EOFs are made by using the polymerization-induced phase separation method with an initially homogeneous
mixture of a pre-polymer, liquid crystal and small amount of carbon nanotubes (CNTs). The effects of the concentrations
of CNTs and liquid crystals on the electro optical properties of the EOFs are studied. The rise times for the CNTcontaining
EOFs is around 200 μs at 6V/μm, while the fall time is around 30ms at 6V/μm twice as fast as that of the
EOF without CNTS. The dielectric measurements show that the relaxation frequency of the EOFs increases with the
increase of CNT doping, indicating the decrease in droplets size. The morphology of EOFs is confirmed with SEM
morphological studies. With the increase of the concentration of CNT or liquid crystal, the threshold voltages of the
EOFs are decreased and the response times are faster.
We developed an electrically switchable mirror based on polymer-stabilized, short-pitched
cholesteric liquid crystals using electro-optical cells with planar alignment. The devices enable the switching
of a pre-selected reflective wavelength of the cholesteric to reflect a different wavelength in corresponding to
the magnitude of applied electric field. The principle of the wavelength shift to a shorter wavelength is a
result of field-induced pitch shortening near the boundaries. The spectral wavelength shift of the reflected
wavelength is about 140-nm and the wavelength shift is linearly proportional to the magnitude of applied
voltage. The optical response of the device is also studied.
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