The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 26, 1996
Filed:
Oct. 13, 1995
Yutaka Sawayama, Tenri, JP;
Masako Nakamura, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
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.