Patents by Inventor Yuji Sohda

Yuji Sohda 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).

  • Liquid crystal display element and color display device having particular transflector
    Patent number: 6654082
    Abstract: A liquid crystal display element comprising a color filter having a plurality of colored portions each having a different spectral color and a reflector wherein the color filter is so adapted that transmitted light from the standard C light source is substantially achromatic and the transmittance of visible light by the standard C light source is 30-65%.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: November 25, 2003
    Assignee: Optrex Corporation
    Inventors: Yuji Sohda, Yoshinori Hirai, Masao Ozeki, Toshihiko Suzuki
  • Liquid crystal display device
    Patent number: 5923392
    Abstract: The liquid crystal display device of the present invention comprises a liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material, the liquid crystal layer being interposed between a pair of substrates with transparent electrodes each having an aligning layer which are arranged substantially in parallel to provide a twist angle of 160-300.degree., a driving means to apply a voltage across the electrodes attached to the substrates which interpose the liquid crystal layer, a pair of polarizing plates arranged outside the liquid crystal layer, and at least one birefringent plate provided between the liquid crystal layer and the polarizing plate at at least one side of the liquid crystal layer, wherein the product .DELTA.n.sub.1 .multidot.d, of the anisotropy of refractive index .DELTA.n, of liquid crystal molecules in the liquid crystal layer and the thickness d, of the liquid crystal layer is in a range of 0.4-1.5 .mu.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: July 13, 1999
    Assignee: Asahi Glass Company Ltd.
    Inventors: Minoru Akatsuka, Yuji Sohda, Kazutoshi Sawada
  • Liquid crystal display device having birefringent films with n.sub.x >n.sub. >n.sub.y
    Patent number: 5650833
    Abstract: The liquid crystal display device of the present invention comprises a liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material, the liquid crystal layer being interposed between a pair of substrates with transparent electrodes each having an aligning layer which are arranged substantially in parallel to provide a twist angle of 160.degree.-300.degree., a driving means to apply a voltage across the electrodes attached to the substrates which interpose the liquid crystal layer, a pair of polarizing plates arranged outside the liquid crystal layer, and at least one birefringent plate provided between the liquid crystal layer and the polarizing plate at at least one side of the liquid crystal layer, wherein the product .DELTA.n.sub.1 .multidot.d, of the anisotropy of refractive index .DELTA.n, of liquid crystal molecules in the liquid crystal layer and the thickness d, of the liquid crystal layer is in a range of 0.4-1.5 .mu.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: July 22, 1997
    Assignee: Asahi Glass Company Ltd.
    Inventors: Minoru Akatsuka, Yuji Sohda, Kazutoshi Sawada
  • Liquid crystal display device having light shielding film and birefringent films with N.sub.x =N.sub.z >N.sub.y
    Patent number: 5523867
    Abstract: The liquid crystal display device of the present invention comprises a liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material, the liquid crystal layer being interposed between a pair of substrates with transparent electrodes each having an aligning layer which are arranged substantially in parallel to provide a twist angle of 160.degree.-300.degree., a driving means to apply a voltage across the electrodes attached to the substrates which interpose the liquid crystal layer, a pair of polarizing plates arranged outside the liquid crystal layer, and at least one birefringent plate provided between the liquid crystal layer and the polarizing plate at at least one side of the liquid crystal layer, wherein the product .DELTA.n.sub.1 .multidot.d, of the anisotropy of refractive index .DELTA.n, of liquid crystal molecules in the liquid crystal layer and the thickness d, of the liquid crystal layer is in a range of 0.4-1.5 .mu.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: June 4, 1996
    Assignee: Asahi Glass Company Ltd.
    Inventors: Minoru Akatsuka, Yuji Sohda, Kazutoshi Sawada
  • Liquid crystal display device using uniaxial birefringent films for improving viewing angle
    Patent number: 5406396
    Abstract: The liquid crystal display device of the present invention comprises a liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material, the liquid crystal layer being interposed between a pair of substrates with transparent electrodes each having an aligning layer which are arranged substantially in parallel to provide a twist angle of 160.degree.-300.degree., a driving means to apply a voltage across the electrodes attached to the substrates which interpose the liquid crystal layer, a pair of polarizing plates arranged outside the liquid crystal layer, and at least one birefringent plate provided between the liquid crystal layer and the polarizing plate at at least one side of the liquid crystal layer, wherein the product .DELTA.n.sub.1 .multidot.d, of the anisotropy of refractive index .DELTA.n, of liquid crystal molecules in the liquid crystal layer and the thickness d, of the liquid crystal layer is in a range of 0.4-1.5 .mu.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: April 11, 1995
    Assignee: Asahi Glass Company Ltd.
    Inventors: Minoru Akatsuka, Yuji Sohda, Kazutoshi Sawada
  • Liquid crystal display device with biaxial birefringent plates and light shielding film
    Patent number: 5369513
    Abstract: The liquid crystal display device of the present invention comprises a liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material, the liquid crystal layer being interposed between a pair of substrates with transparent electrodes each having an aligning layer which are arranged substantially in parallel to provide a twist angle of 160.degree.-300.degree., a driving means to apply a voltage across the electrodes attached to the substrates which interpose the liquid crystal layer, a pair of polarizing plates arranged outside the liquid crystal layer, and at least one birefringent plate provided between the liquid crystal layer and the polarizing plate at at least one side of the liquid crystal layer, wherein the product .DELTA.n.sub.1 .multidot.d, of the anisotropy of refractive index .DELTA.n, of liquid crystal molecules in the liquid crystal layer and the thickness d, of the liquid crystal layer is in a range of 0.4-1.5 .mu.
    Type: Grant
    Filed: December 7, 1992
    Date of Patent: November 29, 1994
    Assignee: Asahi Glass Company, Ltd.
    Inventors: Minoru Akatsuka, Yuji Sohda, Kazutoshi Sawada
  • Liquid crystal display device having biaxial birefringent plates at each side of the liquid crystal layer
    Patent number: 5194975
    Abstract: The liquid crystal display device of the present invention comprises a liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material, the liquid crystal layer being interposed between a pair of substrates with transparent electrodes each having an aligning layer which are arranged substantially in parallel to provide a twist angle of 160.degree.-300.degree., a driving means to apply a voltage across the electrodes attached to the substrates which interpose the liquid crystal layer, a pair of polarizing plates arranged outside the liquid crystal layer, and at least one birefringent plate provided between the liquid crystal layer and the polarizing plate at at least one side of the liquid crystal layer, wherein the product .DELTA.n.sub.1 .multidot.d, of the anisotropy of refractive index .DELTA.n, of liquid crystal molecules in the liquid crystal layer and the thickness d, of the liquid crystal layer is in a range of 0.4-1.5 .mu.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: March 16, 1993
    Assignee: Asahi Glass Company Ltd.
    Inventors: Minoru Akatsuka, Yuji Sohda, Kazutoshi Sawada