Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-09-30
1996-09-17
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359102, G02F 11335, C09K 1902
Patent
active
055574343
ABSTRACT:
An improved normally white super-twist nematic (OMI) liquid crystal display exhibits a dramatically improved horizontal viewing angle as compared to conventional OMI displays. The display's liquid crystal cell has a twist angle greater than about 180.degree. and less than about 270.degree., preferably between 220.degree. and 250.degree., and a phase retardation of between 500 nanometers (nm) and 850 nm. The improved display includes a novel compensator which incorporates, as one of its compensation elements, a positively birefringent oblique compensator layer (referred to as an O-plate compensator layer). Additionally, a positively birefringent A-plate compensator layer and one or more negatively birefringent C-plate compensator layers may be used in the display.
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Hale Leonard G.
Saxena Ragini
Taber Donald B.
Winker Bruce K.
Montanye G. A.
Murrah M. Lee
Rockwell International
Sikes William L.
Trice Ron
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