CdS-Nanoparticle-Doped Liquid Crystal Displays Showing Low Threshold Voltage

概要

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Low operation voltage is one of the most crucial factors for developing mobile liquid crystal display devices. Nanoparticle doping is a convenient method of attaining low threshold voltage. A type of widely studied semiconductor material, CdS nanoparticles, was doped into 4$'$-$n$-pentyl-4-cyanobiphenyl (5CB) nematic liquid crystal material. First of all, we have proved that CdS nanoparticle doping can significantly reduce the threshold voltage of 5CB twisted-nematic cells by up to 25%. The response time and frequency modulation characteristics of nanoparticle-doped liquid crystal cells were also studied. In addition, the phase transition temperature, order parameter, and dielectric constants were measured to analyze the cause of the threshold voltage reduction. All the physical properties of the doped materials have the same variation tendency with the threshold voltage as they are correlated with the nanoparticle size and doping concentration. Finally, a doped liquid crystal display device model was proposed and computer simulation was carried out on the basis of this model, yielding electrooptical results that can agree well with experimental data.
2009-05-25