Light modulating material and method for preparing same

Details Light modulating material and method for preparing same Light modulating material and method for preparing same

1990-11-16

1992-02-11

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonchiral additive having no specified mesophase

25229901, 252582, 252589, 428 1, 359104, 359103, G02F 113, C09K 1954, C09K 1952, C09K 1900

Patent

active

050873873

ABSTRACT:
An improved light modulating material for use in electro-optic and thermo-optic display devices is produced by forming a homogeneous solution comprising an acrylic resin containing active hydrogen groups, a liquid crystal material, a diisocyanate or epoxide, and a solvent. The homogeneous solution is preferably applied to a conductive substrate and the solvent is then evaporated, causing phase separation resulting in formation of a liquid crystal phase dispersed within a solid polymer matrix. Application of an electric field to the substrate causes the liquid crystal material to align, which in turn causes the coating to switch from substantially translucent to substantially transparent. If the electric field is removed the light modulating material again becomes substantially translucent. Switching times can be improved by incorporating a titanate or zirconate organometallic material into the light modulating material.

REFERENCES:
patent: 3578844 (1971-05-01), Churchill et al.
patent: 3585381 (1971-06-01), Hodson et al.
patent: 3697297 (1972-10-01), Churchill et al.
patent: 3720623 (1973-03-01), Cartmell et al.
patent: 3852092 (1974-12-01), Patterson et al.
patent: 3872050 (1975-03-01), Benton et al.
patent: 3935337 (1976-01-01), Taylor
patent: 4101207 (1978-07-01), Taylor
patent: 4182700 (1980-01-01), Benton et al.
patent: 4268126 (1981-05-01), Mumford
patent: 4456335 (1984-06-01), Mumford
patent: 4605284 (1986-08-01), Fergason
patent: 4616903 (1986-10-01), Fergason
patent: 4623738 (1986-11-01), Sugerman et al.
patent: 4671618 (1987-06-01), Wu et al.
patent: 4672089 (1987-06-01), Pricone et al.
patent: 4673255 (1987-06-01), West et al.
patent: 4685771 (1987-08-01), West et al.
patent: 4688900 (1987-08-01), Doane et al.
patent: 4707080 (1987-11-01), Fergason
patent: 4742097 (1988-05-01), Turpin et al.
Eugene E. Sprow, "Liquid Crystal Displays Brighten", Machine Design, Sep. 7, 1972, pp. 112-117.
Paul S. Drzaic, "Polymer Dispersed Liquid Crystal for Large Area Displays and Light Valves", J. Appl. Phys. 60(6), Sep. 15, 1986, pp. 2142-2148.
Glenn H. Brown, "Liquid Crystals 2, Part I", Proceedings of the 2nd International Liquid Crystal Conference Held at Kent State Univ., Aug. 12-16, 1968, pp. 177-183.
West, J. L., MCLC, 157, 427, 1988.

Affiliated with

Also associated with

Rating

Light modulating material and method for preparing same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Light modulating material and method for preparing same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light modulating material and method for preparing same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-780372