Liquid crystal display apparatus having driving voltage to enabl

Details Liquid crystal display apparatus having driving voltage to enabl Liquid crystal display apparatus having driving voltage to enabl

1994-03-30

1996-01-16

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 63, G02F 11335

Patent

active

054852951

ABSTRACT:
The present invention provides a liquid crystal display apparatus having preferable viewing performance with low cost. A display in a dark state is performed with an applied voltage which makes a square sum of deviation of normalized Stokes parameters S1', S2' for light transmitted through a twisted nematic liquid crystal layer having wavelengths, 450 nm, 500 nm, 550 nm, 600 nm, 650 nm from their regression line 51 equal to or less than 0.05, a slow axis 52 of an optical compensation layer crosses over perpendicularly with the regression line 51 on a Poincare sphere sighted from a S3' axis direction, a phase difference of the optical compensation layer, .delta.(.lambda.), is defined by the following equation;

REFERENCES:
patent: 4007979 (1977-02-01), Coblitz
patent: 5107356 (1992-04-01), Castleberry
patent: 5166817 (1992-11-01), Ota
patent: 5291322 (1994-03-01), Itoh

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