Liquid crystal display device having pleochroic dye and particul

Details Liquid crystal display device having pleochroic dye and particul Liquid crystal display device having pleochroic dye and particul

1995-10-13

1996-11-26

Sikes, William L.

Optical: systems and elements

Optical computing without diffraction

359 78, 359 70, 359 98, G02F 1137, G02F 11335

Patent

active

055791425

ABSTRACT:
A liquid crystal display device of the present invention includes: a pair of substrates, at least one of which is transparent; and a liquid crystal layer interposed between the pair of substrates, the liquid crystal layer having a helical structure including: a liquid crystal material having a positive dielectric constant anisotropy; a pleochroic dye; and at least one of a cholesteric liquid crystal material and a chiral agent as an optical active material, wherein the liquid crystal layer has a helical axis in a thickness direction of the liquid crystal layer, and longitudinal axes of liquid crystal molecules in a vicinity of the pair of substrates are substantially parallel to the substrates, a ratio of a natural pitch (p.sub.0) and a thickness (d) of the liquid crystal layer of the helical structure satisfies a relationship: (2.theta.-.pi.)/4.pi.<d/p.sub.0 .ltoreq..theta./2.pi., where a twisted angle of the helical structure is .theta. rad, and the twisted angle .theta. rad of the helical structure is within a range: 2.pi..infin..theta..ltoreq.5.pi./2.

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