Reversible display medium

Details Reversible display medium Reversible display medium

1994-06-21

1996-12-31

Ahmad, Nasser

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With charge transferring layer of specified composition

25229901, 25229968, 359 43, 359 45, 359 63, 359 72, 428480, 349 22, 349 96, 349116, C09K 1952, G02F 1137

Patent

active

055892370

ABSTRACT:
A reversible display medium comprising substrate 1 having thereon recording layer 2 containing a side chain type high polymeric liquid crystal capable of repeatedly and reversibly switching between a transparent state and a light-scattered state by the action of heat, an electrical field or a magnetic field, wherein said side chain type high polymeric liquid crystal is a copolymer comprising at least one liquid crystal monomer unit and at least one non-liquid crystal monomer unit having a hydrogen bond-forming substituent, e.g., a hydroxyl group, a carboxyl group, a sulfonic group or a phosphoric group. The display medium is excellent in durability on repeated use, heat sensitivity, display contrast, and record preservability.

REFERENCES:
patent: 4837745 (1989-06-01), Eich
patent: 4965591 (1990-10-01), Kurabayashi
patent: 5173381 (1992-12-01), Natansohn
patent: 5354498 (1994-10-01), Akashi
"Thermotropic Liquid-Crystalline Polymers-VI", Valery P. Shibaev et al., Eur. Polym. J., vol. 18, 1982, pp. 651 to 659.
"Application of Side Chain Type Liquid Crystal Polymer for Display and Recording Devices", T. Nakamura, et al., Mol. Cryst. Liq. Cryst., vol. 169, pp. 167-192.

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