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:
Mar. 27, 2001
Filed:
Oct. 24, 1997
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
A normally white mode twisted nematic liquid crystal display devices having significantly improved viewing angle characteristics of display contrast and gray scale inversion comprising an about 90° twisted nematic liquid crystal cell and a first and a second light polarizing film separately disposed on two sides of said liquid crystal cell, a first and a second optical compensation layer which each comprises at least one optical compensation layer and has almost no refractive index anisotropy in-plane of the optical compensation layer A and has a characteristic wherein a refractive index in the thickness direction of the optical compensation layer A is lower than that in-plane of the optical compensation layer A, and a first and second optical compensation layer B, which each comprises at least one optical compensation layer and has optically positive refractive index anisotropy and has a characteristic wherein a principal optic axis of the optical compensation layer B is tilted 20 to 70° from the normal direction of the optical compensation layer B, wherein said liquid crystal cell, said light polarizing films and said optical compensation layers A and B are laminated in the following order: said first light polarizing film, said first optical compensation layer A, said first optical compensation layer B, said liquid crystal cell, said second optical compensation layer B, said second optical compensation layer A and said second light polarizing film.