Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-11-15
1994-07-12
Gross, Anita P.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 73, G02F 1133, G02F 11335
Patent
active
053293878
ABSTRACT:
A liquid crystal device of this invention is constituted by a display cell, a compensation cell, and a pair of polarizing plates. The display cell is designed such that electrodes are respectively formed on the opposing surfaces of a pair of substrates, arranged to oppose each other through a predetermined gap, to be perpendicular to each other, alignment films are respectively formed to cover the electrodes, and a first liquid crystal material is sealed between the substrates to be twisted at a predetermined angle. The compensation cell is arranged to be stacked on the display cell. The compensation cell is designed such that a second liquid crystal material is sealed between a pair of substrates, subjected to alignment processing, to be twist-aligned in a direction opposite to the twist direction of the first liquid crystal material. The pair of polarizing plates are arranged to sandwich the display and compensation cells. A refractive index anisotropy .DELTA.n.sub.1 of the first liquid crystal material is 0.18 or more, and a product .DELTA.n.sub.1 .multidot.d.sub.1 of the refractive index anisotropy .DELTA.n.sub.1 of a layer thickness d.sub.1 of the first liquid crystal material is 0.7 .mu.m or more. A product .DELTA.n.sub.2 .multidot.d.sub.2 of a refractive index anisotropy .DELTA.n.sub.2 and a layer thickness d.sub.2 of the second liquid crystal material is smaller than the product .DELTA.n.sub.1 .multidot.d.sub.1 of the first liquid crystal material.
REFERENCES:
patent: 5044732 (1991-09-01), Kimura et al.
patent: 5126868 (1992-06-01), Kizaki et al.
patent: 5136406 (1992-08-01), Kato et al.
Sakai Kazuhiro
Suzuki Tsuyoshi
Yanagisawa Masaki
Casio Computer Co. Ltd.
Gross Anita P.
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