Bistable Switching in PDLC Film with a Ferroelectric Alignment Layer

Masako INOMATA  Masahiro NAKAGAWA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E79-C   No.8   pp.1047-1057
Publication Date: 1996/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Liquid-Crystal Displays)
Category: 
Keyword: 
PDLC,  bistability,  ferroelectric alignment layer,  

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Summary: 
In this work is first presented that a PDLC film with a ferroelectric alignment layer realizes a bistable switching in similar to the surface-stabilised ferroelectric liquid crystal display devices. Such a bistability is found to critically depend on the squareness parameter of the ferroelectric layer as well as such material properties of the dispersed nematics as the elastic and the dielectric constants. It is also found that there exists an appropriate elastic constant to improve the optical transmittance. The dependence of the distribution of the radii of the nematic droplets on the electro-optic bistability is also investigated in detail by means of the numerical computations assuming a fractal distribution. The fundamental electro-optic properties of the presently, proposed PDLC cells imply the advantage beyond the conventional PDLC without any ferroelectric alignment layer.