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. 17, 2001
Filed:
Sep. 22, 1999
Tatsuo Uchida, Miyagi-ken, JP;
Mitsuo Ohizumi, Fukushima-ken, JP;
Mitsuru Kano, Miyagi-ken, JP;
Toshiaki Hoshino, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
In a reflective liquid crystal display device, a retardation &Dgr;nd,of a liquid crystal cell ranges from 705 nm to 890 nm. When alignment directions a and b of alignment layers are viewed from the light incident side, and the direction between the alignment directions a and b that bisects the interior angle, which is formed by an intersection of the alignment directions a and b, and the alignment directions a and b, is designated a normal direction X, a retardation &Dgr;nd,of a first retardation film ranges from 195 nm to 280 nm, an angle formed by a delayed phase axis RF,of the retardation film with respect to the normal direction X ranges from 75° to 115°, counterclockwise, as viewed from the light incident side, a retardation &Dgr;nd,of a second retardation film ranges from 310 nm to 415 nm, an angle formed by a delayed phase axis RF,of the retardation film with respect to the normal direction X ranges from 130° to 180°, counterclockwise, as viewed from the light incident side, and an angle formed by an absorption axis Pol of a polarizing plate with respect to the normal direction X ranges from 80° to 130° or 170° to 220°, counterclockwise, as viewed from the light incident side.