Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-03-14
1993-02-02
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 72, 359 82, G02F 11335, G02F 1135, G02F 11333
Patent
active
051842378
ABSTRACT:
A liquid crystal cell display device including a liquid crystal cell comprising a pair of substrates having transparent electrodes and aligning films, a liquid crystal composition with a positive dielectric anisotropy positioned between the substrates, major axes of the liquid crystal molecules being aligned nearly parallel in a plane parallel to the substrate when a field is applied and the liquid crystal molecules being twisted in an angle of 120.degree. to 360.degree. in a direction perpendicular to the substrate; a pair of polarizers positioned on opposite sides of the cell; and one or more birefringent layers positioned between the cell and at least one of the polarizers in which a maximum refractive index directions at a planes contacting the polarizer and the liquid crystal cell, are tilted with respect to a plane parallel to the substrate, angles made between each of the directions and the parallel plane are symmetrical one another with regard to a plane parallel to the substrate when angles made between the substrate and maximum refractive index directions positioned between the contacting planes of the birefringent layers are continuously distributed.
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Iimura et al.--"STN-LCD With Improved Viewing Angle Characteristics Using A Birefringent Film" SID 89 Digest--vol. XX--May 1989--pp. 398-401.
Iimura Haruo
Kanemoto Akihiko
Takiguchi Yasuyuki
Gross Anita Pellman
Ricoh & Company, Ltd.
Sikes William L.
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