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:
Apr. 02, 1991
Filed:
Jan. 18, 1990
Frans Leenhouts, Kaiseraugst, CH;
Martin Schadt, Seltisberg, CH;
Hoffmann-La Roche Inc., Nutley, NJ (US);
Abstract
A liquid crystal display (LCD) cell comprising a highly twisted nematic liquid crystal disposed between two electrode plates and polarizers and having a positive dielectric anisotropy. The optical path difference .DELTA.n.d is 0.2 to 0.7 .mu.m and the ratio d/p of thickness to pitch is 0.2 to 0.6. The absolute value of the twist angle .phi. can be between 120.degree. and 260.degree. for a right-hand twist or left-hand twist, the angle .psi. between the polarizers can be between 0.degree. and 180.degree. and the angle .beta. between the surface orientation direction and the polarization direction on the screen on the light incidence side can be between 0.degree. and 360.degree..
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile