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:
Jan. 30, 1996
Filed:
Jul. 15, 1993
Takaaki Tanaka, Suwa, JP;
Yuzuru Sato, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A display characteristic of a high contrast ratio and a high transmittance through the application of a chiral nematic liquid crystal medium switchable between metastable states via Frederick's transition is utilized as a liquid crystal electrooptical element. The electrooptical element employs a white light source and is switchable between metastable states in which the polarization axes of both polarization plates are set to predetermined angles P and A according to the initial state of the liquid crystal medium and the product, R, of the thickness, d, and the difference, .DELTA.n, in the refractive indices of the liquid crystal medium for extraordinary light, n.sub.e, and ordinary light, n.sub.o (.DELTA.n=n.sub.e -n.sub.o).