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:
Jul. 12, 1994
Filed:
Nov. 15, 1991
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A liquid crystal device of this invention is constituted by a display cell, a compensation cell, and a pair of polarizing plates. The display cell is designed such that electrodes are respectively formed on the opposing surfaces of a pair of substrates, arranged to oppose each other through a predetermined gap, to be perpendicular to each other, alignment films are respectively formed to cover the electrodes, and a first liquid crystal material is sealed between the substrates to be twisted at a predetermined angle. The compensation cell is arranged to be stacked on the display cell. The compensation cell is designed such that a second liquid crystal material is sealed between a pair of substrates, subjected to alignment processing, to be twist-aligned in a direction opposite to the twist direction of the first liquid crystal material. The pair of polarizing plates are arranged to sandwich the display and compensation cells. A refractive index anisotropy .DELTA.n.sub.1 of the first liquid crystal material is 0.18 or more, and a product .DELTA.n.sub.1 .multidot.d.sub.1 of the refractive index anisotropy .DELTA.n.sub.1 of a layer thickness d.sub.1 of the first liquid crystal material is 0.7 .mu.m or more. A product .DELTA.n.sub.2 .multidot.d.sub.2 of a refractive index anisotropy .DELTA.n.sub.2 and a layer thickness d.sub.2 of the second liquid crystal material is smaller than the product .DELTA.n.sub.1 .multidot.d.sub.1 of the first liquid crystal material.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile