Patents by Inventor Hisao Yokokura
Hisao Yokokura 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: 7790248Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N?I) of a liquid crystal composite forming the liquid crystal layer.Type: GrantFiled: February 21, 2007Date of Patent: September 7, 2010Assignee: Hitachi, Ltd.Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
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Patent number: 7615260Abstract: An active-matrix liquid crystal display device includes a pair of substrates, a liquid crystal layer disposed between the pair of substrates, a group of electrodes for applying to the liquid crystal layer an electric field substantially parallel to the substrate plane and a plural number of active elements being formed on one of the pair of substrates, and an alignment layer disposed between the liquid crystal layer and at least one of the pair of substrates. The alignment layer is made from polyamic acid obtained by reacting a diamine with an acid anhydride, and the acid anhydride is at least one member selected from the group consisting of 1,2,3,4-cyclopentanetetracarboxylic acid dianhydride, 1,2,3,4-butanetetracarboxylic acid dianhydride, and 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride.Type: GrantFiled: June 24, 2004Date of Patent: November 10, 2009Assignee: Hitachi, Ltd.Inventors: Makoto Yoneya, Kishiro Iwasaki, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Yoshiharu Nagae
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Publication number: 20070178250Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N-I) of a liquid crystal composite forming the liquid crystal layer.Type: ApplicationFiled: February 21, 2007Publication date: August 2, 2007Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
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Patent number: 7189439Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N-I) of a liquid crystal composite forming the liquid crystal layer.Type: GrantFiled: December 11, 2003Date of Patent: March 13, 2007Assignee: Hitachi, Ltd.Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
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Publication number: 20050012884Abstract: An in-plane switching active-matrix liquid crystal display device includes an alignment layer which is a photo-reactive material layer disposed between a liquid crystal layer and at least one of a pair of substrates of the display device. The display device includes at least one of (a) a tilt angle of 3° or less, (b) an extrapolation length of at least 10% of a gap between the pair of substrates, (c) a torsional anchoring coefficient A2 of an alignment layer surface for liquid crystal molecules at an inner face of the liquid crystal layer and the alignment layer which is not greater than 20 ?N/m, and (d) the alignment layer is obtained by using as an acid moiety an acid hydride except for benzophenone tetracarboxylic dianhydride.Type: ApplicationFiled: June 24, 2004Publication date: January 20, 2005Inventors: Makoto Yoneya, Kishiro Iwasaki, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Yoshiharu Nagae
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Patent number: 6833898Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an inorganic film is formed on a surface of at least one of the plurality of pixel electrodes and the plurality of common electrodes, an organic polymer film is formed on the inorganic film and the liquid crystal layer is in direct contact with the organic polymer film.Type: GrantFiled: November 5, 2002Date of Patent: December 21, 2004Assignee: Hitachi, Ltd.Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
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Publication number: 20040170777Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N-I) of a liquid crystal composite forming the liquid crystal layer.Type: ApplicationFiled: December 11, 2003Publication date: September 2, 2004Inventors: Yasushi Tomioke, Takao Miwa, Katsumi Kondo, Hisao Yokokura
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Patent number: 6756089Abstract: An active-matrix liquid crystal display device having a pair of substrates at least one of which is transparent, a liquid crystal layer disposed between the pair of substrates, a group of electrodes for applying to the liquid crystal layer an electric field substantially parallel to the substrate plane and a plural number of active elements being formed on one of the pair of substrates and an alignment layer disposed between the liquid crystal layer and at least one of the pair of substrates. The alignment layer is a photo-reactive material layer, and the photo-reactive material layer is a photo-reactive alignment layer which has been subjected to linearly polarized light irradiation to selectively derive a photochemical reaction and a tilt angle of liquid crystal molecules on the alignment layer surface of the substrate is 3° or less.Type: GrantFiled: March 15, 2001Date of Patent: June 29, 2004Assignee: Hitachi, Ltd.Inventors: Makoto Yoneya, Kishiro Iwasaki, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Yoshiharu Nagae
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Patent number: 6682783Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; an electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N-I) of a liquid crystal composite forming the liquid crystal layer.Type: GrantFiled: May 4, 1998Date of Patent: January 27, 2004Assignee: Hitachi, Ltd.Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
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Publication number: 20030058397Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an inorganic film is formed on a surface of at least one of the plurality of pixel electrodes and the plurality of common electrodes, an organic polymer film is formed on the inorganic film and the liquid crystal layer is in direct contact with the organic polymer film.Type: ApplicationFiled: November 5, 2002Publication date: March 27, 2003Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
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Patent number: 6483564Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an organic polymer film is formed on at least one of the pixel electrodes and the common electrodes, and the liquid crystal layer is in direct contact with the organic polymer film.Type: GrantFiled: October 24, 2001Date of Patent: November 19, 2002Assignee: Hitachi, Ltd.Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
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Publication number: 20020027632Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an organic polymer film is formed on at least one of the pixel electrodes and the common electrodes, and the liquid crystal layer is in direct contact with the organic polymer film.Type: ApplicationFiled: October 24, 2001Publication date: March 7, 2002Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
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Publication number: 20010046569Abstract: An active-matrix liquid crystal display device having a pair of substrates at least one of which is transparent, a liquid crystal layer disposed between the pair of substrates, a group of electrodes for applying to the liquid crystal layer an electric field substantially parallel to the substrate plane and a plural number of active elements being formed on one of the pair of substrates and an alignment layer disposed between the liquid crystal layer and at least one of the pair of substrates. The alignment layer is a photo-reactive material layer, and the photo-reactive material layer is a photo-reactive alignment layer which has been subjected to linearly polarized light irradiation to selectively derive a photochemical reaction and a tilt angle of liquid crystal molecules on the alignment layer surface of the substrate is 3° or less.Type: ApplicationFiled: March 15, 2001Publication date: November 29, 2001Inventors: Makoto Yoneya, Kishiro Iwasaki, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Yoshiharu Nagae
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Patent number: 6310676Abstract: A liquid crystal display apparatus having a pair of substrates and a liquid crystal layer interposed between the pair of substrates. One of the pair of substrates has an electrode structure including a plurality of pixel electrodes and a plurality of common electrodes, an organic polymer film is formed on at least one of the pixel electrodes and the common electrodes, and the liquid crystal layer is in direct contact with the organic polymer film.Type: GrantFiled: February 7, 2000Date of Patent: October 30, 2001Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
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Patent number: 6242060Abstract: An active-matrix liquid crystal display device having a pair of substrates at least one of which is transparent, a liquid crystal layer disposed between the pair of substrates, a group of electrodes for applying to the liquid crystal layer an electric field substantially parallel to the substrate plane and a plural number of active elements being formed on one of the pair of substrates, and an alignment layer disposed between the liquid crystal layer and at least one of the pair of substrates. The alignment layer is a photo-reactive material layer, and the photo-reactive material layer is a photo-reactive alignment layer which has been subjected to linearly polarized light irradiation to selectively derive a photochemical reaction.Type: GrantFiled: March 31, 1999Date of Patent: June 5, 2001Assignee: Hitachi, Ltd.Inventors: Makoto Yoneya, Kishiro Iwasaki, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Yoshiharu Nagae
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Patent number: 6236441Abstract: A liquid crystal display apparatus and a method of manufacturing wherein the liquid crystal display apparatus includes a pair of substrates, a liquid crystal layer interposed between the pair of substrates, plural electrodes formed on at least one of the pair of substrates, a passivation layer formed on the plural electrodes and having concave portions, a thin film having low wettability formed on the passivation layer, and an insulating layer formed on the thin film having low wettability. The method includes the steps of irradiating light onto the thin film through a mask, and applying a solution containing organic high polymers so as to form the insulating layer at the concave portions of the passivation layer.Type: GrantFiled: September 2, 1999Date of Patent: May 22, 2001Assignee: Hitachi, Ltd.Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Hiroyuki Kagawa, Hisao Yokokura, Katsumi Kondo, Shigeru Matsuyama, Masahito Oh-e
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Patent number: 6222602Abstract: A liquid crystal display having a wide viewing angle, a large contrast ratio, and little nonuniformity of display, is formed by a pair of substrates, and a liquid crystal layer interposed between the pair of substrates, wherein at least one of the pair of substrates has plural electrodes, a passivation layer formed on the plural electrodes, and an insulating layer formed at concave portions of the passivation layer for making the thickness of the liquid crystal layer uniform.Type: GrantFiled: September 30, 1996Date of Patent: April 24, 2001Assignee: Hitachi, LtdInventors: Sukekazu Aratani, Yoshiyuki Umeda, Hiroyuki Kagawa, Hisao Yokokura, Katsumi Kondo, Shigeru Matsuyama, Masahito Oh-e
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Patent number: 6130737Abstract: A liquid crystal display apparatus has a pair of substrates and a liquid crystal layer interposed between the pair of substrates, one of the pair of substrates having an electrode structure composed of a plurality of electrodes for generating an electric field having a dominant component parallel to the substrate in the liquid crystal layer, a protective film formed on the electrode structure, and an alignment film formed on the protective film, and the thickness of the protective film is greater than the thickness of the electrode in contact with the protective film by more than 0.4 .mu.m.Type: GrantFiled: January 8, 1998Date of Patent: October 10, 2000Assignee: Hitachi, Ltd.Inventors: Sukekazu Aratani, Yoshiyuki Umeda, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Setsuo Kobayashi
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Patent number: 6047098Abstract: A plastic optical waveguide with a low loss property, a low birefringence and a high temperature endurance constructed with a polyimide obtained from an acid dianhydride based component and a diamine based component, wherein at least one of a core layer and a cladding layer of the optical waveguide is made of an acid dianhydride based component including an alicyclic acid dianhydride or an aliphatic acid dianhydride, the plastic optical waveguide having an optical loss in a 1.3 .mu.m band of 0.5 dB/cm or less, and a refractive index of the core layer being larger than that of the cladding layer.Type: GrantFiled: February 3, 1998Date of Patent: April 4, 2000Assignee: Hitachi, Ltd.Inventors: Masakazu Sagawa, Takao Miwa, Hisao Yokokura
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Patent number: 5928733Abstract: An active-matrix liquid crystal display device employing the in-plane switching mode in which an electric field substantially parallel to the substrate surface is applied to the liquid crystals, characterized by weak torsional anchoring of the liquid crystal molecules and the alignment layer surface at the liquid crystal/alignment layer interface to an extent that the extrapolation length which expresses the strength of said torsional anchoring will become not less than 10% of the gap between the substrates. For obtaining such weak torsional anchoring, an organic alignment layer comprising a polymer and/or oligomer having long-chain alkylene and/or fluoro groups, or an inorganic alignment layer formed by oblique evaporation technique, or a photo-reactive alignment layer formed by linearly polarized light irradiation is used.Type: GrantFiled: May 8, 1997Date of Patent: July 27, 1999Assignee: Hitachi, Ltd.Inventors: Makoto Yoneya, Kishiro Iwasaki, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Yoshiharu Nagae