Liquid crystal element with higher resistivity in the encapsulat

Details Liquid crystal element with higher resistivity in the encapsulat Liquid crystal element with higher resistivity in the encapsulat

1992-06-26

1994-04-26

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 99, 359 52, G02F 113

Patent

active

053071875

ABSTRACT:
A liquid crystal display element comprises a liquid crystal material having a resistivity .rho..sub.LC (.OMEGA..multidot.cm) and a polymer matrix material having a resistivity .rho..sub.p (.OMEGA..multidot.cm). The ratio .rho..sub.LC /.rho..sub.p is defined to fall within a range of between 1 and 10.sup.5 (1.ltoreq..rho..sub.LC /.rho..sub.p .ltoreq.10.sup.5). Also, the particles diameters of the polymer matrix material or the liquid crystal material are distributed such that at least two peaks each having a half value width of at least 0.5 .mu.m are present within a range of between 0.5 .mu.m and 2.5 .mu.m. Further, a protective layer is formed to cover the outer surface of the liquid crystal material. The particular construction permits manufacturing a polymer dispersion type liquid crystal display element, which exhibits a high response speed, which can be operated with a low driving voltage, and which permits a high contrast.

REFERENCES:
patent: 4671618 (1987-06-01), Wu et al.
patent: 4673255 (1987-06-01), West et al.
patent: 4701024 (1987-10-01), Kobayashi et al.
patent: 5082351 (1992-01-01), Fergason
patent: 5096282 (1992-03-01), Margerum et al.
patent: 5103327 (1992-04-01), Hirai et al.
patent: 5138472 (1992-08-01), Jones et al.
Database WPIL, No. 91-136 000, & JP-A-03-072 317, Mar. 27, 1991, "Liquid Crystal Display Device Driven With Low Voltage-Comprises Polymer Layer(s) Held By Transparent Conductive Substrates".
Database WPIL, No. 89-351 903, & JP-A-01-262 530, Oct. 19, 1989, "Liquid Crystal Display Element-Has Cholesteric Liquid Crystals Dispersed In Granular Form In Polymer Layer Held Between Pair Of Display Electrodes".

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