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. 22, 2008
Filed:
Mar. 03, 2003
Toshihisa Uchida, Matsusaka, JP;
Koichi Miyachi, Seika-cho, JP;
Masumi Kubo, Ikoma, JP;
Nobuhiko Nakai, Taki-cho, JP;
Hidehiko Ohkura, Taki-cho, JP;
Toshihisa Uchida, Matsusaka, JP;
Koichi Miyachi, Seika-cho, JP;
Masumi Kubo, Ikoma, JP;
Nobuhiko Nakai, Taki-cho, JP;
Hidehiko Ohkura, Taki-cho, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The liquid crystal display device of the invention includes: a liquid crystal layer taking on a roughly vertically aligned state in the black display state: first and second polarizing plates placed to face each other so that the transmission axes are orthogonal to each other; at least one first phase plate placed between the liquid crystal layer and the first polarizing plate and/or the second polarizing plate; at least one second phase plate placed between the first phase plate and the first or second polarizing plate whichever is farther from the first phase plate; and an illuminator for illuminating the liquid crystal layer with light via the first or second polarizing plate. The first phase plate has biaxial optical anisotropy and has functions of compensating part of thickness-direction retardation of the liquid crystal layer in the black display state and suppressing light leakage caused by deviation of the transmission axes of the first and second polarizing plates from the mutual orthogonal relationship in a tilted viewing angle direction. The second phase plate has negative uniaxial optical anisotropy and has a function of compensating the thickness-direction retardation of the liquid crystal layer in the black display state in cooperation with the first phase plate.