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:
Oct. 25, 1988
Filed:
Feb. 20, 1987
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The twisted nematic liquid crystal display device of this invention relates to a liquid crystal cell having a twisted spiral structure by disposing a pair of substrates opposedly to each other with the rubbed orientation films formed on the electrodes, placing a nematic liquid crystal having a positive dielectric anisotrophy containing an optically active substance between this pair of substrates, and shifting the orientation direction of the liquid crystal molecules by a specified angle of .phi. on both substrates, in which the angle .phi. is set in a range of 210.degree..ltoreq..phi..ltoreq.300.degree., and the ratio d/p of the spiral pitch p of the liquid crystal molecules to layer thickness d of the liquid crystal cell is set in a range of (.phi./360-1/4)<d/p<.phi./360.