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. 28, 2006
Filed:
Sep. 06, 2002
Yoshihiro Kumagai, Yokohama, JP;
Akira Masaki, Yokohama, JP;
Tetsuya Uesaka, Yokohama, JP;
Nippon Oil Corporation, Tokyo, JP;
Abstract
A liquid crystal display device has a liquid crystal cell, a liquid crystalline substance layer, a pair of polarizers, and an optical compensation element. The twist angle of the liquid crystal cell is set to 180 to 270 degrees. The optical compensation element has a twisted structure twisted in the opposite direction to that of the liquid crystal cell. The difference in the absolute values of the twist angles between the liquid crystal cell and the optical compensation element is from 40 to 100 degrees. The difference in retardation at a wavelength λ=550 nm between the liquid crystal cell and the optical compensation element is from 100 to 250 nm. When the absolute values of the differences in retardation at wavelengths λ of 400 nm and 550 nm between the liquid crystal cell and the optical compensation element are represented by ΔR(400) and ΔR(550), respectively, and the ratio D therebetween is represented by D=ΔR(400)/ΔR(550), D is within the range of 0.5 to 1.0.