Projection type active matrix polymer dispersed liquid crystal d

Details Projection type active matrix polymer dispersed liquid crystal d Projection type active matrix polymer dispersed liquid crystal d

1991-08-23

1993-06-01

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 51, 359 93, 359102, G02F 113, G02F 1137

Patent

active

052165310

ABSTRACT:
An active matrix liquid crystal display element comprising an active matrix substrate having an active element for each electrode for picture element, a counter electrode substrate provided with a counter electrode and a liquid crystal polymer composite material in which a nematic liquid crystal having a positive dielectric anisotropy is dispersed and held in a polymer matrix, said liquid crystal polymer composite material being held between the active matrix substrate and the counter electrode substrate wherein the refractive index of the polymer matrix substantially agrees with the ordinary refractive index (n.sub.0) of the liquid crystal used, characterized in that the refractive index anisotropy .DELTA.n of the nematic liquid crystal used is 0.18 or higher, and the average particle diameter R(.mu.m) of the liquid crystal dispersed and held in the polymer matrix, the aspect ratio A in average of liquid crystal particles, and the specific dielectric anisotropy .DELTA..epsilon., the elastic constant K33(10.sup.-12 N) and the viscosity .eta. (cSt) of the liquid crystal satisfy the following relations:

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patent: 5150232 (1992-09-01), Gunjima et al.
Molecular Crystals and Liquid Crystals, vol. 165, Dec. 1988, pp. 511-532, J. W. Doane, et al., "Polymer Dispersed Liquid Crystals for Display Application".
Society for Information Display International Syposium, May 24-26, 1988, pp. 227-230, J. Pirs, et al., "Low-Loss High-Intensity Color Projection".

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