Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-10-26
1992-08-11
Miller, Stanley D.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
G02F 11335
Patent
active
051384744
ABSTRACT:
A liquid crystal display comprising a liquid crystal element, at least two birefringent films and a pair of polarizing sheets so arranged that said element and said films are held therebetween, said liquid crystal element comprising a cell composed of two sheets of substrates and a twisted nematic liquid crystal, each substrate being provided with an electrode on one surface thereof, said substrates being arranged so that the electrodes are opposed to each other and said twisted nematic liquid crystal being held between said electrodes, characterized in that said birefringent films are composed of at least one uniaxially stretched film of a polymer having a positive intrinsic birefringence and light transmission properties and at least one uniaxially stretched film of a polymer having a negative intrinsic birefringence and light transmission properties.
REFERENCES:
patent: 4852976 (1989-08-01), Suzuki
patent: 4889412 (1989-12-01), Clerc et al.
patent: 4909606 (1990-03-01), Wada et al.
patent: 4957349 (1990-09-01), Clerc et al.
patent: 4973137 (1990-11-01), Kozaki
patent: 4984874 (1991-01-01), Yamamoto et al.
Fuji Photo Film Co. , Ltd.
Gross Anita Pellman
Miller Stanley D.
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