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:
Oct. 09, 2001
Filed:
Dec. 28, 1998
Yuzo Hisatake, Kanagawa-ken, JP;
Takashi Nakamura, Saitama-ken, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Abstract
A flat panel display device includes a polarizer, a polarized light reflection layer made of a cholesteric liquid crystal layer, a fixed retarder layer to delay an incident light phase by &lgr;/4, and a variable retarder layer to shift an incident light phase by &lgr;/2 in response to applied voltages. The fixed and variable retarder layers are held between the polarizer and the polarized light reflection layer. A retardation plate and a second polarizer are disposed behind the polarized light reflection layer to transform incident light into a circularly polarized light component of which rotation direction is the same as that of the circularly polarized light selectively reflected from the polarized light reflection layer. The flat panel display device is used as reflection type and semi-transmission type displays with high light efficiency of light utilization and high brightness as well as low power consumption.