Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-08-02
1993-02-02
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 73, 359 93, G02F 11335, G02F 1137
Patent
active
051842360
ABSTRACT:
A liquid crystal display device includes first and second substrates bonded with each other with an annular seal sandwiched therebetween. A liquid crystal is filled in a sealed space between the substates, molecules of which are so aligned that they are twisted at 90.degree.. The value of a product .DELTA.nd of the refractive-index anisotropy .DELTA.n of a LC layer and the LC layer thickness d falls from 350 nm to 700 nm. A first electrode and a first aligning film executed by an aligning treatment in a predetermined first direction and covering the electrode are formed on an inner surface of the first substrate. Second electrodes and a second aligning film executed by an aligning treatment in a second direction different at 90.degree. from the first direction and covering the electrode are formed on an inner surface of the second substrate. A pair of polarizing plates are disposed outsides of the both substrates, so that a polarizing axis of one plate is directed toward a direction perpendicular to or parallel to the first direction and that of another plate is directed to cross at 90.degree. the former axis. A retardation plate is disposed between the polarizing plates, so that a direction of a delayed or advanced phase axis thereof is equal to or different in a range of .+-.15.degree. from the first direction. The product .DELTA.nd of the retardation plate falls from 300 nm to 600 nm.
REFERENCES:
patent: 4385806 (1983-05-01), Fergason
patent: 4436379 (1984-03-01), Funada et al.
patent: 4652088 (1987-03-01), Kando et al.
patent: 5107356 (1992-04-01), Castleberry
patent: 5124824 (1992-06-01), Kozaki et al.
Kikuchi Zenta
Miyashita Takashi
Miyazawa Yoshinaga
Casio Computer Co. Ltd.
Gross Anita Pellman
Sikes William L.
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