Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-03-25
1994-03-01
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 63, 359 73, G02F 11343, G02F 11335
Patent
active
052913228
ABSTRACT:
A liquid crystal display device is disclosed, which comprises a liquid crystal cell including a first substrate having a first electrode, a second substrate having a second electrode, which is opposite to the first substrate, and a nematic liquid crystal layer disposed between the first substrate and the second substrate; a first polarizer disposed outside of the first substrate; a second polarizer disposed outside of the second substrate; and at least one optically anisotropic layer disposed at least one of between the first substrate and the first polarizer and between the second substrate and the second polarizer. The twist angle of the nematic liquid crystal layer is greater than 180.degree.; and the following conditions are fulfilled: ##EQU1## where .DELTA.n.sub.LC represents a birefringence of the nematic liquid crystal; d.sub.LC a thickness of the nematic liquid crystal layer; .DELTA.n.sub.i a birefringence of the optically anisotropic layer; d.sub.i a thickness of the optically anisotropic layer; and m a number of optically anisotropic layers.
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Hirakata Jun-ichi
Itoh Osamu
Kikuchi Naoki
Kondo Katsumi
Gross Anita Pellman
Hitachi , Ltd.
Sikes William L.
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