Iso-contrast curves as a function of viewing angle between eight gray levels in sequence have been investigated for two-domain twisted nematic liquid crystal displays. The optimal twist angle has been found to be approximately 80°. The two-domain 80°-twisted nematic LCD shows a large viewing zone of ±45° in the vertical and ±60° in the horizontal directions without grayscale reversals. We have demonstrated a simple fabrication method which requires only one photo-lithographic exposure and a total of three independent rubbing directions on two polyimide-coated substrates.
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K. H. Yang K. H. Yang (1992) studied this question.
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