Colored liquid-crystal display device having supertwisted nemati

Details Colored liquid-crystal display device having supertwisted nemati Colored liquid-crystal display device having supertwisted nemati

1991-01-24

1992-03-24

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 63, 359 68, 359 78, 359106, G02F 1133

Patent

active

050993453

ABSTRACT:
A colored liquid-crystal display device comprising a positive dielectric anisotropy nematic liquid-crystal layer with the dielectric constant anisotropy, the liquid-crystal layer having an optically active substance; a pair of electrode substrates facing each other and sandwiching therebetween the positive dielectric anisotropy nematic liquid-crystal layer in such a manner that the positive dielectric anisotropy nematic liquid-crystal is formed into a twisted structure with a fixed angle of twist of the liquid-crystal molecules, .phi., of the positive dielectric anisotropy nematic liquid-crystal layer in the direction of a thickness d of the positive dielectric anisotropy nematic liquid-crystal layer; and a polarizer and a analyzer positioned outside of the pair of electrode substrates, respectively, wherein the twist angle .phi. is set to be in the range of 180.degree. to 300.degree. and the product of the refractivity anisotropy .DELTA.n of the positive dielectric anisotropy nematic liquid-crystal and the thickness d of the positive dielectric anisotropy nematic liquid-crystal, .DELTA.n.multidot.d, is set to be in the range of 0.3 .mu.m to 0.7 .mu.m.

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