Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-06-08
1996-11-19
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359102, G02F 11335, G02F 113
Patent
active
055768610
ABSTRACT:
A normally white liquid crystal display is provided with a positively birefringent uniaxial retardation film having a retardation value of from about 100-200 nm. The retardation film is provided on one side of the liquid crystal layer, the liquid crystal being sandwiched between a pair of orientation or buffing films which orient the liquid crystal molecules adjacent thereto in predetermined directions. The optical axis of the retardation film is rotated from about 2.degree.-20.degree., most preferably from about 6.degree.-10.degree.relative to the buffing direction on the opposite side of the liquid crystal layer. This rotation of the retardation film optical axis allows for the high contrast ratio viewing zone of the display to be shifted vertically into either the positive or negative vertical viewing region depending upon the direction of rotation of the retardation film optical axis. Alternatively, biaxial retardation films having similar retardation values may be utilized according to the teachings of this invention.
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Abileah Adiel
Xu Gang
Gross Anita Pellman
OIS Optical Imaging Systems, Inc.
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