Directly formed polymer dispersed liquid crystal light shutter displays

Patent 5270843 Issued on December 14, 1993. Estimated Expiration Date:

August 31, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3585381

3600060

3720623

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Inventor

Wang, Jiansheng

Application

No. 938881 filed on 08/31/1992

US Classes:

349/90With second material between liquid crystal and encapsulating medium

Examiners

Primary: Sikes, William L.
Assistant: Mai, Huy

Attorney, Agent or Firm

Pravel, Hewitt, Kimball & Krieger

International Class

G02F 001/133

Abstract

A polymer dispersed liquid crystal display device is provided comprising a copolymer formed from monomers having significantly different reactivities. A reverse mode device is provided consisting of negative liquid crystal microdroplets dispersed in a non-homogeneous polymer matrix consisting of a monomer having a high reactivity and a high surface free energy and another monomer having a low reactivity and has a low surface free energy. The surface active monomer is preferentially distributed at the surface of microdroplets formed by phase separation, causing homeotropic alignment of the liquid crystals.

Other References

West, John L., Chapter 32 "Polymer-Dispersed Liquid Crystals," Liquid-Crystalline Polymers, pp. 475-495, 1990
J. W. Doane et al., "12.5: Wide-Angle-View PDLC Displays," SID 90 Digest, pp. 224-226
Y.-D. Ma and B.-G Wu, "Reverse-mode microdroplet liquid crystal display," SPIE vol. 1257 Liquid Crystal Displays and Applications (1990), pp. 46-56
C. K. Ober and R. A. Weiss, "Current Topics in Liquid-Crystalline Polymers", Liquid-Crystalline Polymers, 1990 American Chemical Society, pp. 1-1