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:
Dec. 09, 2003
Filed:
Jul. 20, 2000
Hiroyuki Moriwaki, Nara, JP;
Mitsuhiro Tanaka, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An object of the invention is to prevent color shifting which occurs in a liquid crystal display device in a white display state as well as in a black display state. The liquid crystal display device includes a single polarization layer, a single phase retardation layer, a reflective layer, and a liquid crystal layer, and produces a display by utilizing light reflected from the reflective layer. Based on the wavelength &lgr; of incident light, the retardation value ReF of the phase retardation layer is set approximately equal to (1/4+K/2) &lgr;, and the retardation value ReL of the liquid crystal layer is set approximately equal to (1/2+L/2)&lgr; (K=0, 1, 2, . . . : L=0, 1, 2, . . . ). The angle &Dgr;&phgr; that the absorption axis of the polarization layer makes with the retardation axis of the phase retardation layer is set as 0°<&Dgr;&phgr;<45° or 45°<&Dgr;&phgr;<90°. This prevents the color shifting in the white display state as well as in the black display state in the liquid crystal display device, and improves the contrast.