Abstract
Abstract The liquid crystal (LC) class, material parameter and LC molecular alignment influence on display performance for an LC TV panel, using an MOS active matrix and dc dynamic scattering mode, has been investigated, including the conductivity dopant effect. The material considerations have indicated the following: (1) An LC material with birefringence larger than 0.14 and with viscosity lower than 30 cp is required to be synthesized by an optimized blending of different class LCs, in order to achieve both high contrast and fast response acceptable for TV display. (2) Parallel LC molecular alignment is preferable to perpendicular alignment because, in the latter alignment, response time is considerably increased, although display contrast is rather improved. (3) Simultaneous doping of electron donor and acceptor dopants to LCs is needed to assure an effective improvement in display contrast and dc operating lifetime. Bearing in mind these results, an LC material for use in the LC TV panel has been suc...
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