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:
Feb. 02, 1993
Filed:
Aug. 02, 1991
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A liquid crystal display device includes first and second substrates bonded with each other with an annular seal sandwiched therebetween. A liquid crystal is filled in a sealed space between the substates, molecules of which are so aligned that they are twisted at 90.degree.. The value of a product .DELTA.nd of the refractive-index anisotropy .DELTA.n of a LC layer and the LC layer thickness d falls from 350 nm to 700 nm. A first electrode and a first aligning film executed by an aligning treatment in a predetermined first direction and covering the electrode are formed on an inner surface of the first substrate. Second electrodes and a second aligning film executed by an aligning treatment in a second direction different at 90.degree. from the first direction and covering the electrode are formed on an inner surface of the second substrate. A pair of polarizing plates are disposed outsides of the both substrates, so that a polarizing axis of one plate is directed toward a direction perpendicular to or parallel to the first direction and that of another plate is directed to cross at 90.degree. the former axis. A retardation plate is disposed between the polarizing plates, so that a direction of a delayed or advanced phase axis thereof is equal to or different in a range of .+-.15.degree. from the first direction. The product .DELTA.nd of the retardation plate falls from 300 nm to 600 nm.