Claims
- 1. A normally white twisted nematic liquid crystal display comprising:
- a twisted nematic 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 said liquid crystal layer is in substantially the off-state thereby defining a twisted nematic normally white display;
- a positive retarder having a retardation value of from about 80-200 nm; and
- a negative uniaxial retarder means for retarding light passing therethrough, said negative uniaxial retarder means being defined by n.sub.x =n.sub.y >n.sub.z, where n.sub.x, n.sub.y, and n.sub.z are indices of refraction and the "z" direction is substantially perpendicular to the plane defined by said negative uniaxial retarder means and the "x" and "y" directions are substantially parallel to the plane defined by said negative uniaxial retarder means, and wherein said negative uniaxial retarder means has a retardation value of from about -60 to -220 nm.
Parent Case Info
This is a continuation, division of application Ser. No(s). 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), the disclosures of which are both incorporated herein by reference.
US Referenced Citations (18)
Foreign Referenced Citations (5)
Number |
Date |
Country |
4-56802 |
Feb 1992 |
JPX |
4-97322 |
Mar 1992 |
JPX |
4-311903 |
Nov 1992 |
JPX |
5-257014 |
Oct 1993 |
JPX |
6-130227 |
May 1994 |
JPX |
Continuations (1)
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Number |
Date |
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Parent |
559275 |
Nov 1995 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
167652 |
Dec 1993 |
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