Liquid crystal display device with compensator having .DELTA.nxd

Details Liquid crystal display device with compensator having .DELTA.nxd Liquid crystal display device with compensator having .DELTA.nxd

1989-12-21

1992-08-04

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 73, G02F 1133, G02F 11335

Patent

active

051364050

ABSTRACT:
A liquid crystal display device 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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H. A. Tarry, "Electrically Tunable Narrowband Optical Filter" Electronics Letter, vol. II, No. 19, Sep. 18, 1975, pp. 471-472.

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