DHF ferroelectric liquid crystalline display, switching or image

Details DHF ferroelectric liquid crystalline display, switching or image DHF ferroelectric liquid crystalline display, switching or image

1997-06-10

1998-06-02

Sikes, William L.

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Within smectic phase

349100, 349144, G02F 1141

Patent

active

057608636

ABSTRACT:
The commercial production of DHF cells, in particular a colored DHF display cell, has scarcely become established to date. This is because in particular such cells based on the known prior art expediently must possess a liquid crystal layer having a thickness d of about 1.4 to 2.8 .mu.m, which requires an expensive and complex production process. On the basis of the knowledge that the mean value of the refractive index of a DHF display can be described with that of a birefringent plate, it has now been found that the magnitude of the birefringence .DELTA.n changes significantly within a voltage range typical for DHF cells, in particular for DHF displays having a large switching angle .alpha.. The present invention therefore relates to the utilization of this second effect of the voltage dependence of .DELTA.n, with the object of substantially facilitating the production of DHF displays.

REFERENCES:
patent: 5539555 (1996-07-01), Wand et al.
Abdulhalim and G. Moddel Molecular Crystals and Liquid Crystals, 1991 (200) May, pp. 79 to 101, May 1991.
J. Funfschilling and M. Schadt Journal of Applied Physics, 66 (1989) No. 8, pp. 3877 to 3882, 15 Oct. 1989.

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