Liquid crystal electro-optic device with particular relationship

Details Liquid crystal electro-optic device with particular relationship Liquid crystal electro-optic device with particular relationship

1991-08-16

1993-01-12

Heyman, John S.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 75, 359102, G02F 11335, G02F 11337, G02F 113

Patent

active

051794586

ABSTRACT:
A liquid crystal electro-optic device is disclosed. The liquid crystal electro-optic device is provided with means for optic compensation in order to realize black-and-white display. A high contrast black-and-white display is realized by providing two retardation films having anisotropy of refractive index for optic compensation so that an angle (a) formed by the drawing direction of one of the two retardation films and an edge line of a liquid crystal panel of the device and an angle (b) formed by the drawing direction of the other one of the two retardation films and the edge line satisfy the expressions: (a).ltoreq.90.degree.; (b).ltoreq.90.degree.; and .vertline.(a)-(b).vertline..ltoreq.40.degree..

REFERENCES:
patent: 4844569 (1989-07-01), Wada et al.
patent: 4984874 (1991-01-01), Yamamoto et al.

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