Abstract
ABSTRACT We investigate the switching bistability based on the interaction between dynamic flow and director rota-tion in twisted nematic liquid crystal cells. Numerical calculation shows that there exists a general type of bistable twisted director configurations. Two specific cases are verified experimentally. Keywords: bistability, twisted nematic, liquid crystal displays, backflow, switching 1. INTRODUCTION Twisted nematic (TN) and super-twisted nematic (STN) liquid crystal displays (LCD) are used widelyin many information display systems. Recently, a bistable TN (BTN) LCD has been demonstrated 1,2• This BTN is based on a gross mismatch of the natural twist of the liquid crystal director and the rubbingboundary conditions of the two LC cell surfaces. If the LC cell alignment favors a -twist, then for somevalue of natural helical pitch P, the LC cell can exist either in the -twist state or the (4 + 2ir)-twiststate. Roughly speaking, in the absence of pretilt of the director, the natural twist of the LC cell shouldbe about 4 + ir in order for bistability to occur. Hence the d/P ratio, where d is the LC cell thickness,
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