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High contrast chiral nematic liquid crystal device using negative dielectric material
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the operating principle of the device. (a) With no field applied the chiral nematic LC is optically isotropic between crossed polarizers and the device is off. (b) An applied, in-plane, electric field causes the helical axis to lie in the plane of the device, resulting in a transmissive on state.

Image of FIG. 2.
FIG. 2.

Photomicrographs of the with a negative dielectric anisotropy and pitch 370 nm with (a) no field applied, and under the application of an in-plane electric field of 400 and frequency (b) 30 Hz, (c) 1 kHz, (d) 1 kHz with 15° cell rotation, (e) 1 kHz with 25° cell rotation, and (f) 1 kHz with 45° cell rotation.

Image of FIG. 3.
FIG. 3.

Photographs of the cell between crossed polarizers on a light box, for six different electric field strengths. The electro-optic cells are approximately in dimensions and the polarizers cover the whole field of view. Crossed polarizers are aligned at 45° to the in-plane electrodes.

Image of FIG. 4.
FIG. 4.

Electro-optic characteristics of the device at 1 kHz between crossed polarizers. (a) Transmission-voltage profile. (b) 10%–90% switch-on and 90%–10% switch-off response times.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High contrast chiral nematic liquid crystal device using negative dielectric material