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 said liquid crystal layer is in substantially an off state thereby defining a twisted nematic display;
- first and second negative biaxial retarders, each of said first and second negative biaxial retarders defined by n.sub.x >n.sub.y >n.sub.z, where n.sub.x, n.sub.y, and n.sub.z are respective indices of refraction for each of said biaxial retarders; and
- wherein said first negative biaxial retarder has a retardation value d.multidot.(n.sub.z -n.sub.x) of from about -100 to -200 nm.
- 2. The normally white display of claim 1, wherein the thickness of said liquid crystal layer is from about 4.5 to 6.5 .mu.m, and the birefringence of said liquid crystal is from about 0.075 to 0.095.
- 3. The normally white display of claim 2, further comprising a front polarizer and a rear polarizer, wherein a transmission axis of the front polarizer is aligned substantially perpendicular to a transmission axis of the rear polarizer.
- 4. The normally white display of claim 1, wherein said first and second negative biaxial retarders each are made of a polyimide material.
- 5. The normally white display of claim 1, wherein said liquid crystal layer has a thickness of from about 4.5 to 6.0 .mu.m.
Parent Case Info
This application is a continuation 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 incorporated herein by reference.
US Referenced Citations (9)
Continuations (2)
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Number |
Date |
Country |
Parent |
711797 |
Sep 1996 |
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Parent |
167652 |
Dec 1993 |
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