Effect of ferroelectric nanoparticles in the alignment layer of twisted nematic liquid crystal display

The alignment layer of a conventional twisted nematic liquid crystal device (TNLCD) has been modified by doping it with ferroelectric barium titanate (BaTiO3) nanoparticles. The presence of uniformly dispersed ferroelectric nanoparticles in the alignment layer has enhanced the electro optical property of twisted nematic cell. The transmission-voltage characteristics show that the addition of BaTiO3 nanoparticle has reduced the Frederik's threshold voltage and saturation voltage. The dispersion of nanoparticles in the alignment layer was studied using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Nonlinear optical behaviour of the twisted nematic cell under different applied voltage is also investigated.