Claims
- 1. A normally white twisted nematic liquid crystal display comprising:
- a liquid crystal layer for twisting at least one normally incident visible wavelength of light from about 80.degree.-100.degree. as it passes therethrough when the liquid crystal layer is in substantially the off-state thereby defining a twisted nematic display;
- first and second negative biaxial retarders sandwiching said liquid crystal layer therebetween, wherein n.sub.x >n.sub.y >n.sub.z for each of said negative biaxial retarders, wherein n.sub.z is perpendicular to a plane defined by n.sub.x and n.sub.y ;
- wherein each of said negative biaxial retarders has a retardation value d.multidot.(n.sub.x -n.sub.z) of from about 70-130 nm; and
- wherein the display outputs contrast ratios to the viewer of at least about 30:1 at horizontal viewing angles along the 0.degree. vertical axis of about .+-.60.degree..
Parent Case Info
This is a continuation of application Ser. No. 08/768,502, filed Dec. 18, 1996; which is a CIP of Ser. No. 08/559,275, filed Nov. 15, 1995 (now U.S. Pat. No. 5,657,140) which is a CIP of Ser. No. 08/167,652 filed Dec. 15, 1993 (now U.S. Pat. No. 5,570,214); and this application is also a CIP of Ser. No. 08/711,797, filed Sep. 10, 1996, which is a continuation of Ser. No. 08/167,652, filed Dec. 15, 1993, (now U.S. Pat. No. 5,570,214), the disclosures of which are all hereby incorporated herein by reference.
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Related Publications (2)
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711797 |
Sep 1996 |
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711797 |
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Continuations (1)
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768502 |
Dec 1996 |
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Continuation in Parts (2)
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559275 |
Nov 1995 |
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Parent |
167652 |
Dec 1993 |
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