Patents by Inventor Tamihito Nakagomi
Tamihito Nakagomi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4815825Abstract: A liquid crystal display device including a nematic liquid crystal composition having a twist angle of 160.degree. to 260.degree. of liquid crystal molecules and at least one compound of the formula: ##STR1## (m, n=1-7) further improved in time-multiplexability and display quality.Type: GrantFiled: December 17, 1986Date of Patent: March 28, 1989Assignee: Hitachi, Ltd.Inventors: Tamihito Nakagomi, Yasuhiko Kando, Shinji Hasegawa
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Patent number: 4693562Abstract: A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates so as to constitute a helical structure twisted within a range between 96.degree. and 108.degree. along a direction of thickness thereof, absorption axes of a pair of polarizing plates disposed on the upper and lower substrates constitute an angle between 63.degree. and 73.degree., and a product .DELTA.n.multidot.d of a thickness d (.mu.m) and an optical anisotropy .DELTA.n of a liquid crystal layer falls within a range from 0.69 .mu.m to 0.79 .mu.m.Type: GrantFiled: December 6, 1985Date of Patent: September 15, 1987Assignee: Hitachi, Ltd.Inventors: Shinji Hasegawa, Yasuhiko Kando, Tamihito Nakagomi
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Patent number: 4664482Abstract: A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates so as to constitute a helical structure twisted within a range between 200.degree. and 260.degree. along a direction of thickness thereof, and polarizing axes or absorption axes of a pair of polarizing plates disposed on the upper and lower substrates are angularly displaced by a predetermined angle or predetermined angles from major axes of liquid crystal molecules adjacent to the upper and lower substrates, respectively.Type: GrantFiled: March 12, 1986Date of Patent: May 12, 1987Assignee: Hitachi, Ltd.Inventors: Yasuhiko Kando, Tamihito Nakagomi, Shinji Hasegawa
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Patent number: 4653865Abstract: A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates so as to constitute a helical structure twisted within a range between 140.degree. and 250.degree. along a direction of thickness thereof, and polarizing axes or absorption axes of a pair of polarizing plates disposed on the upper and lower substrates are angularly displaced by a predetermined angle or predetermined angles from major axes of liquid crystal molecules adjacent to the upper and lower substrates, respectively, and a ratio of thickness of the nematic liquid crystal to a natural molecular helical pitch of the nematic liquid crystal added with a chiral material falls within a range of from 0.14 to 0.60 inclusive.Type: GrantFiled: April 2, 1986Date of Patent: March 31, 1987Assignee: Hitachi, Ltd.Inventors: Yasuhiko Kando, Tamihito Nakagomi, Shinji Hasegawa, Yoshio Hanada
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Patent number: 4653861Abstract: A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates so as to constitute a helical structure twisted within a range between 160.degree. and 200.degree. along a direction of thickness thereof, and polarizing axes or absorption axes of a pair of polarizing plates disposed on the upper and lower substrates are inclined by a predetermined angle with respect to major axes of liquid crystal molecules adjacent to the upper and lower substrates, respectively.Type: GrantFiled: August 27, 1984Date of Patent: March 31, 1987Assignee: Hitachi, Ltd.Inventors: Yasuhiko Kando, Tamihito Nakagomi, Shinji Hasegawa
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Patent number: 4652088Abstract: A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates so as to constitute a helical structure twisted within a range between 90.degree. and 160.degree. along a direction of thickness thereof, polarizing axes or absorption axes of a pair of polarizing plates disposed on the upper and lower substrates are inclined by a predetermined angle falling within a range between 25.degree. and 65.degree. with respect to major axes of liquid crystal molecules adjacent to the upper and lower substrates, respectively, and in the direction of the twist of the liquid crystal, and a product .DELTA.n.multidot.d of a thickness d (.mu.m) and an optical anisotropy .DELTA.n of a liquid crystal layer falls within a range from 0.8 .mu.m to 1.2 .mu.m.Type: GrantFiled: January 29, 1985Date of Patent: March 24, 1987Assignee: Hitachi, Ltd.Inventors: Yasuhiko Kando, Tamihito Nakagomi, Shinji Hasegawa
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Patent number: 4588518Abstract: A nematic liquid crystal composition comprising (a) at least one compound of the formula: ##STR1## wherein R.sub.1 is n--C.sub.m H.sub.2m+1, n--C.sub.m H.sub.2m+1 --O or n--C.sub.m H.sub.2m+1 --CO; R.sub.2 is n--C.sub.q H.sub.2q+1, n--C.sub.q H.sub.2q+1 --O or n--C.sub.q H.sub.2q+1 --CO; m and q are each an integer of 1 to 10 and n is a symbol indicating that carbons are linked linearly, and (b) at least one compound of the formula: ##STR2## wherein R.sub.3 is n--C.sub.r H.sub.2r+1 or n--C.sub.r H.sub.2r+1 --O; R.sub.4 is n--C.sub.s H.sub.2s+1 or n--C.sub.s H.sub.2s+1 --O; r and s are each an integer of 1 to 10 and n is as defined above, and where necessary (c) at least one nematic liquid crystal compound having positive dielectric anisotropy and/or its homologous compound, and if necessary (d) at least one nematic liquid crystal compound having negative dielectric anisotropy and/or its homologous compound.Type: GrantFiled: August 29, 1979Date of Patent: May 13, 1986Assignee: Hitachi, Ltd.Inventors: Tamihito Nakagomi, Kazuhisa Toriyama, Masatoshi Ito
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Patent number: 4455261Abstract: A compound represented by the general formula ##STR1## wherein R represents a linear alkyl group having 1 to 10 carbon atoms.Type: GrantFiled: November 4, 1982Date of Patent: June 19, 1984Assignees: Dainippon Ink and Chemicals, Inc., Hitachi, Ltd.Inventors: Makoto Sasaki, Haruyoshi Takatsu, Hisato Sato, Tuneo Shimamura, Kazuhisa Toriyama, Tamihito Nakagomi
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Patent number: 4372871Abstract: A nematic liquid crystal composition composed of (i) at least one compound of the general formula ##STR1## wherein R.sub.1 represents n-C.sub.m H.sub.2m+1, R.sub.2 represents n-C.sub.q H.sub.2q+1 -O, and m and q are integers of 1 to 10,(ii) at least one compound selected from the group consisting of nematic liquid crystalline compounds having positive dielectric anisotropy and homologs thereof, and (iii) as an optional ingredient, at least one compound selected from the group consisting of nematic liquid crystalline compounds having negative dielectric anisotropy and homologs thereof. This liquid crystal composition is colorless and chemically stable and has superior multiplexing drive characteristics. These properties render it useful as a display element.Type: GrantFiled: November 5, 1980Date of Patent: February 8, 1983Assignees: Dainippon Ink and Chemicals, Inc., Hitachi Ltd.Inventors: Kazuhisa Toriyama, Tamihito Nakagomi, Hisato Sato, Yutaka Fujita, Katsuhiko Morita, Yoshi Arai