Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-04-22
1995-12-19
Schilling, Richard L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 75, 430 70, 428 1, 4284735, G07F 11337
Patent
active
054773601
ABSTRACT:
A liquid crystal display device comprising a liquid crystal cell including a pair of substrates each having an alignment film on the surface thereof, and a liquid crystal filled in a space between the substrates, which is provided with a plurality of alignment regions, each region having the direction of alignment or the rise direction of liquid crystal molecule different from another region within a display region. The alignment film comprises a polyimide having a glass transition point of 300.degree. to 400.degree. C., a skeleton having no two-revolution axis, non-conjugated carbon occupying 10 to 60% of the total number of carbon excluding carbon atoms directly connected to imido group, a relative dielectric constant of 4 to 7 at a frequency of 1 kH and at a temperature of 20.degree. C., or an imidization degree of not less than 90%, or a polyimide obtained by reacting tetracarboxylic acid di-anhydride with a di-amine compound, or a polyimide obtained by imidizing a polyimide, the tetracarboxylic acid di-anhydride moiety being prohibited of the free rotation thereof.
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Hasegawa Rei
Nagata Hiroyuki
Okamoto Masumi
Sunohara Kazuyuki
Yamamoto Takeshi
Kabushiki Kaisha Toshiba
Pasterczyk J.
Schilling Richard L.
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