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:
Nov. 13, 2007
Filed:
Apr. 14, 2004
Kozo Nakamura, Tenri, JP;
Satoru Kishimoto, Tenri, JP;
Kozo Nakamura, Tenri, JP;
Satoru Kishimoto, Tenri, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A twisted nematic liquid crystal display device conducts a display operation in Normally Black mode. The liquid crystal display device includes a liquid crystal cell and two polarizers. The liquid crystal cell includes two substrates and a liquid crystal layer sandwiched between them. The two polarizers face each other with the liquid crystal cell interposed between them. The liquid crystal display device further includes: a first optical compensator provided between one of the two polarizers and the liquid crystal cell so as to compensate for the wavelength dependence of the angle of rotation of polarized light passing through the liquid crystal layer in a black display state; and a second optical compensator provided between the first optical compensator and that polarizer so as to compensate for the wavelength dependence of the ellipticity of the polarized light passing through the liquid crystal layer in the black display state.