Liquid crystal display device
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United States of America Patent
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Mar 20, 1990
Issued Date -
N/A
app pub date -
Apr 28, 1989
filing date -
May 19, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A liquid crystal display device and method of fabrication thereof includes a first twisted nematic liquid crystal cell and an optically anisotropic material sandwiched between two polarizers. A second twisted nematic liquid crystal cell or polymer film serves as the optically anisotropic material. The optically anisotropic material may be disposed on one or both sides of the first twisted nematic liquid crystal. The optically anisotropic material compensates for the elliptical polarization of the light passing through the liquid crystal cell so that the device transmits white light in the OFF state and appears black in the ON state.
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