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. 28, 1998
Filed:
Nov. 21, 1995
Toshiaki Hoshino, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A liquid crystal color display device comprises a liquid crystal cell 3 having a liquid crystal layer with an angle of twist being within a range of 180.degree. to 270.degree. and a pair of electrode substrates intervening the liquid crystal layer therebetween, a twist phase plate 4 serving as a birefringent layer, and a pair of polarizers 2,5. The value of .DELTA.n.cndot.d of the phase plate 4, wherein .DELTA.n represents a refractive index anisotropy and d represents a thickness, and that of the liquid crystal layer in voltage-free condition are substantially at the same level within a range of 1.4 to 2.0 .mu.m. The value of .DELTA.n.cndot.d of the liquid crystal layer can be continuously changed by appropriately controlling a voltage applied thereto. By this, colorization of the device is possible.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile