Reduction of the Threshold Voltages of Nematic Liquid Crystal Electrooptical Devices by Doping Inorganic Nanoparticles

Abstract

We report the reduction of threshold voltage, Vth, of twisted nematic liquid crystal devices by doping the nanoparticles of MgO and SiO2. The results are well explained by inserting the experimentally determined values of elastic constants and dielectric anisotropy in the formula Vth = π√Keff/ε0Δε, where both of these quantities decrease due to the existence of these nanoparticles. The Vth decrease approximately as √S, where S being the order parameter. The S is also shown to decrease by doping nanoparticles.