Polarizer-free, electrically switchable and optically rewritable displays based on dye-doped polymer-dispersed liquid crystals

This work demonstrates the feasibility of a polarizer-free, electrically switchable and optically rewritable display based on dye- doped polymer-dispersed liquid crystals (DD-PDLCs). Experimental results indicate that the doped dyes are homeotropically adsorbed onto the polymer film when an appropriate AC voltage is applied during patterning. The adsorbed dyes in the illuminated region then align the liquid crystals homeotropically, and produce a transparent pattern in the scattering background without any polarizer. Notably, the adsorbed dyes can be erased and readsorbed using thermal and optical treatments, respectively. The switching time of the fabricated display is of the order of milliseconds, and the contrast ratio is similar to 30. (C) 2009 Optical Society of America