Patents by Inventor Shuichi Kohzaki

Shuichi Kohzaki 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).

  • Patent number: 6628359
    Abstract: A liquid crystal display device includes a liquid crystal cell having a pair of substrates and a liquid crystal layer. The liquid crystal layer is sandwiched between the pair of substrates. A pair of polarizer elements sandwiches the liquid crystal cell. The liquid crystal display device further includes a phase difference compensation element provided between the liquid crystal cell and at least one of the pair of polarizer elements. A photoelasticity coefficient of the phase difference compensation element is 10×10−13 cm2/dyne or less.
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: September 30, 2003
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shinichi Terashita, Shuichi Kohzaki
  • Patent number: 5956112
    Abstract: This invention provides a liquid crystal display device including a display medium layer containing at least a liquid crystal material sandwiched between a pair of substrates. In this liquid crystal display device, at least one of the pair of substrates is a plastic substrate having first irregularities on a surface facing the display medium layer, and a polymer wall of a photocurable resin is formed in the display medium layer.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: September 21, 1999
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kohichi Fujimori, Tokihiko Shinomiya, Shuichi Kohzaki, Yutaka Ishii
  • Patent number: 5667720
    Abstract: A liquid crystal display device according to the present invention includes a pair of opposing substrates and polymer dispersed liquid crystal interposed between the pair of opposing substrates, the polymer dispersed liquid crystal including a polymer matrix and a plurality of liquid crystal droplets partitioned by the polymer matrix. The polymer matrix and the plurality of liquid crystal droplets are formed by applying light and/or heat to a polymer dispersed liquid crystal precursor in which a polymer for forming the polymer matrix and liquid crystal molecules for forming the liquid crystal droplets are combined via a combining group, the combining group being cleaved by the application of light and/or heat.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: September 16, 1997
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Noriaki Onishi, Shuichi Kohzaki
  • Patent number: 5638194
    Abstract: A ferroelectric liquid crystal display device according to the present invention includes: a pair of substrates disposed so as to oppose each other, at least one of the pair of substrates being transparent; electrodes formed on an inside face of each of the pair of substrates; and a display medium for displaying an image, the display medium being divided into at least one liquid crystal region composed essentially of ferroelectric liquid crystal and a polymer region composed essentially of liquid crystalline polymer, and the display medium being controlled by applying a voltage to the electrodes.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: June 10, 1997
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Nobuaki Yamada, Tomoaki Kuratate, Shuichi Kohzaki
  • Patent number: 5624974
    Abstract: A photopolymerizable resin material composition for forming a polymer used for a liquid crystal display apparatus includes at least one acrylate compound selected from the group consisting of a bifunctional acrylate compound having a fluorine substitution ratio .alpha. in the range of 0.1<.alpha.<0.8, a bifunctional acrylate compound having a fluorine substitution ratio .alpha. in the range of 0.ltoreq..alpha.<0.8, a bifunctional acrylate compound having a fluorine substitution ratio .alpha. in the range of 0.1<.alpha.<0.8, a bifunctional acrylate compound having a fluorine substitution ratio .alpha. in the range of 0.1<.alpha.<0.8 and a bifunctional acrylate compound having a fluorine substitution ratio .alpha. in the range of 0.1<.alpha.<0.8 and a bifunctional acrylate compound having a fluorine substitution ratio .alpha. in the range of 0.1<.alpha.<0.8, and a photopolymerization delaying resin material.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: April 29, 1997
    Assignees: Sharp Kabushiki Kaisha, Nippon Kayaku Co., Ltd.
    Inventors: Noriaki Onishi, Nobuaki Yamada, Shuichi Kohzaki, Daisaku Matsunaga, Takao Aizawa, Toru Ozaki
  • Patent number: 5625473
    Abstract: A method for producing a liquid crystal display device, includes the steps of: attaching a first substrate having a counter electrode to a second substrate having a plurality of pixel electrodes provided in a matrix and active elements provided for the respective pixel electrodes so that a predetermined gap is kept between the counter electrode and the pixel electrodes; injecting a mixture including liquid crystal and photocurable resin into the gap; and irradiating light to the mixture with the pixel electrodes and the active elements non-irradiation regions, thereby forming a liquid crystal layer including liquid crystal regions surrounded by polymer walls in the respective pixel electrodes.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: April 29, 1997
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masahiko Kondo, Nobuaki Yamada, Shuichi Kohzaki, Yasuhiro Yamamoto
  • Patent number: 5620630
    Abstract: A liquid crystal display device according to the present invention includes a pair of electrode substrates and a polymer dispersed liquid crystal complex film interposed between the pair of substrates. The polymer dispersed liquid crystal complex film includes a liquid crystal composition and a polymer resin composition. It is ensured that a value .DELTA.T is 25.degree. C. or less, and a glass transition temperature T.sub.g of the polymer resin composition is 60.degree. C. or more, the value .DELTA.T being defined as a difference between a phase transition temperature T.sub.CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof and a phase transition temperature T.sub.matrix of the polymer dispersed liquid crystal complex film.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: April 15, 1997
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Noriaki Onishi, Nobuaki Yamada, Masahiko Kondo, Nobukazu Nagae, Toshiyuki Hirai, Shuichi Kohzaki
  • Patent number: 5608555
    Abstract: A liquid crystal display device according to the present invention includes a pair of electrode substrates and a polymer dispersed liquid crystal complex film interposed between the pair of substrates. The polymer dispersed liquid crystal complex film includes a liquid crystal composition and a polymer resin composition. It is ensured that a value .DELTA.T is 25.degree. C. or less, and a glass transition temperature T.sub.g of the polymer resin composition is 60.degree. C. or more, the value .DELTA.T being defined as a difference between a phase transition temperature T.sub.CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof and a phase transition temperature T.sub.matrix of the polymer dispersed liquid crystal complex film.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: March 4, 1997
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Noriaki Onishi, Nobuaki Yamada, Masahiko Kondo, Nobukazu Nagae, Toshiyuki Hirai, Shuichi Kohzaki
  • Patent number: 5583675
    Abstract: A liquid crystal display device includes a pair of substrates opposed to each other; a plurality of pixels for realizing display; and a liquid crystal layer interposed between the substrates and including a liquid crystal region corresponding to each of the pixels, the liquid crystal regions being surrounded by a polymer wall. At least one of the substrates is transparent and includes thereon an optical element for adjusting a transmittance of light therethrough. The optical element corresponds to each of the pixels. The optical element has a transmittance of no greater than 50% with respect to light of at least one wavelength in the range of 250 to 400 nm and has a maximum transmittance of at least 20% with respect to light of a wavelength of more than 400 nm.
    Type: Grant
    Filed: May 16, 1994
    Date of Patent: December 10, 1996
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Nobuaki Yamada, Masahiko Kondo, Shuichi Kohzaki, Makoto Ohue, Shinji Shimada, Masahiro Adachi
  • Patent number: 5583673
    Abstract: A liquid crystal display device according to the present invention includes a pair of electrode substrates and a polymer dispersed liquid crystal complex film interposed between the pair of substrates. The polymer dispersed liquid crystal complex film includes a liquid crystal composition and a polymer resin composition. It is ensured that a value a .DELTA.T is 25.degree. C. or less, and a glass transition temperature T.sub.g of the polymer resin composition is 60.degree. C. or more, the value .DELTA.T being defined as a difference between a phase transition temperature T.sub.CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof and a phase transition temperature T.sub.matrix of the polymer dispersed liquid crystal complex film.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: December 10, 1996
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Noriaki Onishi, Nobuaki Yamada, Masahiko Kondo, Nobukazu Nagae, Toshiyuki Hirai, Shuichi Kohzaki
  • Patent number: 5541753
    Abstract: A liquid crystal display comprises a nematic liquid crystal layer disposed between alignment layers. The alignment layers are formed on substrates which also carry display control electrodes connected to a drive circuit. Polarisers are provided on opposite sides of the substrates. The alignment layers are arranged such that the liquid crystal molecule pretilt angles at the surfaces of the alignment layers are parallel. The liquid crystal layer has a retardance equal to (M+1).lambda./2 at a first operating voltage and M.lambda./2 at a second operating voltage, where M is an integer greater than zero or less than minus one and .lambda. is a wavelength of visible light.
    Type: Grant
    Filed: March 10, 1994
    Date of Patent: July 30, 1996
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Edward P. Raynes, Jonathan Harrold, Shuichi Kohzaki
  • Patent number: 5517343
    Abstract: An object of the invention is to improve the display uniformity of a liquid crystal display apparatus and thereby make the viewing angle less problematic. A pair of first electrodes are formed on one of a pair of light transmitting substrates and a second electrode is formed on each of the first electrodes by polymerizing a conducting polymeric material thereon by the use of constant current electro-polymerization method so as to have a thickness almost equal to the liquid crystal layer thickness. The pair of the first electrodes and the second electrode formed thereon are used as display electrodes. An orientation film is formed on each of the one light transmitting substrate on which the display electrodes are formed and the other of the pair of light transmitting substrates, and thereby a pair of substrate members are formed. A liquid crystal layer is interposed between the substrate members.
    Type: Grant
    Filed: May 20, 1994
    Date of Patent: May 14, 1996
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Motohiro Yamahara, Toshiyuki Hirai, Shuichi Kohzaki
  • Patent number: 5506706
    Abstract: A phase difference plate capable of eliminating contrast changes due to viewing angle changes of display image, coloring phenomenon of display screen, and black and white reversal phenomenon, and a liquid crystal display device capable of displaying images of high quality are presented. A phase difference plate is a drawn and elongated material possessing optical anisotropy such as high polymer compound formed in a flat plate form, and the direction of the minimum principal refractive index na of the three principal refractive indices na, nb, nc of the index ellipsoid is parallel to the y-axis direction, and the direction of the principal refractive index nb is inclined to the normal direction of the surface.
    Type: Grant
    Filed: June 18, 1993
    Date of Patent: April 9, 1996
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Motohiro Yamahara, Kei Sasaki, Teruyoshi Hara, Shuichi Kohzaki
  • Patent number: 5473450
    Abstract: A liquid crystal display device of the present invention includes: two substrates facing each other, at least one of the substrates being transparent; electrodes disposed on inside surfaces of the respective substrates; a display medium which is provided between the two substrates and formed of polymer walls containing a polymer as their main component and liquid crystal regions containing liquid crystal as their main component; and a plurality of pixels, wherein the liquid crystal regions are partitioned by the polymer walls and are close to the substrates, portions of the liquid crystal regions close to the substrates being in parallel with the substrates, an interval a between the center of one liquid crystal region and the center of an adjacent liquid crystal region in a direction along the surface of the substrate is within a width of one pixel along the direction, and 80% or more of the intervals a satisfy the relationship: 3b/2>a>b/2, where b is an average of the intervals a.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: December 5, 1995
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Nobuaki Yamada, Tomoaki Kuratate, Tokihiko Shinomiya, Toshiyuki Hirai, Kohichi Fujimori, Masahiko Kondo, Noriaki Onishi, Shuichi Kohzaki, Kenji Majima, Katunobu Awane
  • Patent number: 5450220
    Abstract: A liquid crystal display device according to the present invention includes a pair of electrode substrates and a polymer dispersed liquid crystal complex film interposed between the pair of substrates. The polymer dispersed liquid crystal complex film includes a liquid crystal composition and a polymer resin composition. It is ensured that a value .DELTA.T is 25.degree. C. or less, and a glass transition temperature T.sub.g of the polymer resin composition is 60.degree. C. or more, the value .DELTA.T being defined as a difference between a phase transition temperature T.sub.CI of the liquid crystal composition between a liquid crystal phase and an isotropic liquid phase thereof and a phase transition temperature T.sub.matrix of the polymer dispersed liquid crystal complex film.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: September 12, 1995
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Noriaki Onishi, Nobuaki Yamada, Masahiko Kondo, Nobukazu Nagae, Toshiyuki Hirai, Shuichi Kohzaki
  • Patent number: 5431850
    Abstract: The invention relates to a nematic liquid-crystal composition for active matrix displays with high voltage holding ratio and extremely good low temperature stability.
    Type: Grant
    Filed: August 8, 1994
    Date of Patent: July 11, 1995
    Assignees: Merck Patent Gensellschaft mit beschrankter Haftung, Sharp Corporation
    Inventors: Masako Nakamura, Kei Sasaki, Shuichi Kohzaki, Fumiaki Funada, Hiroshi Numata, Hideo Ichinose, Herbert Plach, Eike Poetsch
  • Patent number: 5342545
    Abstract: A polymer dispersion type liquid crystal display element includes two layers of polymer dispersion type liquid crystal layers being overlaid and having liquid crystal drops positive in dielectric anisotropy dispersed in a polymer in which light scattering and transmission are controlled electrically, a transparent support element for scattering light between the polymer dispersion type liquid crystal layers, being interposed and a liquid crystal display device having a colored reflector plate disposed on the back of one polymer dispersion type liquid crystal layer. In one of the two layers of polymer dispersion type liquid crystal layers, a liquid crystal layer containing a dichroic dye is dispersed, and coloring and light transmission are electrically controlled, and a white reflector plate is disposed on the back side of one of the polymer dispersion type liquid crystal layers to realize the liquid crystal display device.
    Type: Grant
    Filed: December 31, 1992
    Date of Patent: August 30, 1994
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Nobuaki Yamada, Toshiyuki Hirai, Noriaki Onishi, Shuichi Kohzaki
  • Patent number: 5330679
    Abstract: The invention relates to a nematic liquid-crystal composition for active matrix displays with high voltage holding ratio and extremely good low temperature stability.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: July 19, 1994
    Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, Sharp Corporation
    Inventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Bernhard Rieger, Hiroshi Numata, Reinhard Hittich, Herbert Plach, Thomas Geelhaar, Eike Poetsch, Volker Reiffenrath
  • Patent number: 5308543
    Abstract: The invention relates to a nematic liquid-crystal composition for active matrix displays with high voltage holding ratio and extremely good low temperature stability.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: May 3, 1994
    Assignees: Merck Patent Gesellschaft mit besrankter Haftung, Sharp Corporation
    Inventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Bernhard Rieger, Hiroshi Numata, Reinhard Hittich, Herbert Plach, Thomas Geelhaar, Eike Poetsch, Volker Reiffenrath
  • Patent number: 5279763
    Abstract: A nematic liquid-crystal composition for active matrix displays has a high voltage holding ratio and extremely good low temperature stability.
    Type: Grant
    Filed: September 5, 1991
    Date of Patent: January 18, 1994
    Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, Sharp Corporation
    Inventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Hiroshi Numata, Shohei Naemura, Bernhard Rieger, Herbert Plach