AMORPHOUS HIGHLY TWISTED NEMATIC LIQUID-CRYSTAL DISPLAYS WITH WIDE AND UNIFORM VIEWING ANGLE CHARACTERISTICS

Amorphous highly twisted nematic liquid crystal display devices have b een prepared by a nonrubbing technique. The liquid crystals are inject ed into the cells in the isotropic phase and then cooled down to the n ematic phase. Micro-domains of highly twisted nematic liquid crystals are formed during the cooling process. The twist angles of the micro-d omains are controlled by the concentration of the chrial dopants. The transmission spectrum and the electro-optical characteristics of the d evices have been measured. The experimental results show that the devi ces possess wide and uniform viewing angle characteristics (-51 to +52 /-49 to +48 degrees). The 4 x 4 optical matrix method has been applied to a model of randomly distributed multi-domains of highly twisted ne matic liquid crystals. The theoretical results are in good agreement w ith the experiment.