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:
Sep. 14, 2004
Filed:
Oct. 22, 1999
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The present invention offers reflective color liquid crystal display devices with a high contrast ratio and eye-friendly multi-color display capability, and liquid crystal display devices incorporating a touch panel arranged therefrom, of which the display is not adversely affected by the installation of a pressure sensitive input device. In a reflective liquid crystal display device arranged from a light reflexible substrate ( ) and a substrate ( ); a liquid crystal layer ( ) in which nematic liquid crystal having a positive dielectric anisotropy is sandwiched between the substrates ( ) and ( ); a first optical retardation compensator plate ( ); a second optical retardation compensator plate ( ); and a polarizer plate ( ), {circle around (1)} the retardation of the optical retardation compensator plates ( and ) in the substrate normal direction, {circle around (2)} the angle formed by the slow axes of the optical retardation compensator plates ( and ) and either the transmission axis or the absorption axis of the polarizer plate ( ), {circle around (3)} the twist angle of the liquid crystal layer ( ), {circle around (4)} the product of the birefringence difference of the liquid crystal in the liquid crystal layer ( ) and the thickness of the liquid crystal layer, and {circle around (5)} the angle formed by the alignment direction of the liquid crystal molecules in a close proximity of the substrate ( ) and either the transmission axis or the absorption axis of the polarizer plate are optimized.