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. 21, 2004
Filed:
Jul. 30, 2002
Joost Peter André Vogels, Eindhoven, NL;
Frans Leenhouts, Heerlen, NL;
Peter Van De Witte, Heerlen, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
This invention relates to a liquid crystal display device, comprising at least one retardation film ( ), a nematic liquid crystal layer ( ), and a light reflecting RGB patterned cholesteric color filter ( ), for reflecting either essentially left-circular or right-circular polarized light, being characterized in that said liquid crystal layer ( ) is a super twisted nematic liquid crystal layer having a twist angle in the interval 180-270 degrees, and in that the summed retardation R of the retardation film or retardation films and the liquid crystal layer is equal to approximately R=(3+2n)&lgr;/4, where n=0,1,2,3 . . . .