Investigation of several essential display features for the low birefringent nematic liquid crystal dispersed with polymer
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In this investigation, we have reported some important electro-optical and dielectric parameters for pure nematic liquid crystal (NLC) and polymer-dispersed system. The used liquid crystal in the present investigation is NLC 1550C, consisting of 4′-(trans, trans-4-alkylbicyclohexyl) carbonates and 4′-(4-(trans, trans-4-alkyl)-4-cyanobicyclohexane which is low birefringent material. The dopant used here is polyaniline (PANI). Birefringence has been decreased after the dispersion of polyaniline. Fast optical response time has also been observed for the PANI dispersed system which is the key finding of this investigation, because fast optical response is necessary for any display devices. Splay elastic constant and rotational viscosity have also been calculated and we have found that both parameters are decreasing after the dispersion of polyaniline. We have also calculated threshold voltage and found to be decreased. Relative permittivity has been enhanced for PANI dispersed system. Dielectric anisotropy has also been measured and found to be increased after the dispersion of PANI into the pure NLC. Figure-of-Merit (FoM) is also a very important parameter for display; therefore, we have also calculated FoM which has been decreased for the dispersed system. The output of the present work may be useful in making or enhancing the features of liquid crystal displays and in other energy-efficient devices.
The authors are thankful to DST for grant of Indo-Polish Project and UPCST for grant of project. Authors are also thankful to APJ ABDUL KALAM CENTER FOR INNOVATION for experimental facilities.
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