Patents by Inventor Masumi Kubo

Masumi Kubo 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).

  • Publication number: 20050024546
    Abstract: An alignment-divided vertical alignment liquid crystal display device permitting high-definition moving image display when OS driving is adopted. The device has a plurality of pixels each having a first electrode, a second electrode facing the first electrode, and a vertical alignment liquid crystal layer placed between the first and second electrodes. The device includes: first alignment regulating structure having a first width W1 placed in the first electrode side of the liquid crystal layer; second alignment regulating structure having a second width placed in the second electrode side of the liquid crystal layer; and a liquid crystal region having a third width defined between the first and second alignment regulating structures. The third width W3 is in a range between 2 ?m and 14 ?m in certain embodiments.
    Type: Application
    Filed: July 26, 2004
    Publication date: February 3, 2005
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Akihiro Yamamoto, Hiroyuki Ohgami, Takashi Ochi
  • Publication number: 20050018118
    Abstract: A liquid crystal display device includes a first substrate; a second substrate; a liquid crystal layer interposed between the first substrate and the second substrate; a first polarizer provided on a surface of the first substrate which is on the opposite side to the liquid crystal layer; a second polarizer provided on a surface of the second substrate which is on the opposite side to the liquid crystal layer; a first phase compensation element provided between the first polarizer and the liquid crystal layer; and a second phase compensation element provided between the second polarizer and the liquid crystal layer. A plurality of pixel areas are provided for display. The first substrate includes at least one transmissive electrode, and the second substrate includes a reflective electrode region and a transmissive electrode region in correspondence with each of the plurality of pixel areas.
    Type: Application
    Filed: August 20, 2004
    Publication date: January 27, 2005
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Yozo Narutaki, Shogo Fujioka, Yuko Maruyama, Takayuki Shimada, Youji Yoshimura, Mikio Katayama, Yutaka Ishii, Shinya Yamakawa, Atsushi Ban
  • Publication number: 20050001947
    Abstract: The liquid crystal display device of this invention includes a vertical alignment type liquid crystal layer between a first substrate and a second substrate. A picture element region is defined by a first electrode provided on the surface of the first substrate facing the liquid crystal layer and a second electrode provided on the surface of the second substrate facing the liquid crystal layer. The first substrate has at least one first protrusion with an inclined side face on the surface thereof facing the liquid crystal layer in each of the plurality of picture element regions. A portion of the liquid crystal layer included in each of the plurality of picture element regions is in a substantially vertical orientation state under application of no voltage, and includes at least a part of a first liquid crystal domain placed in a radially-inclined orientation state about the first protrusion under voltage application.
    Type: Application
    Filed: July 27, 2004
    Publication date: January 6, 2005
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Ogishima, Masumi Kubo
  • Publication number: 20050001964
    Abstract: A liquid crystal display device includes a plurality of picture element regions each including a first electrode provided on one side of a first substrate that is closer to a liquid crystal layer and a second electrode provided on a second substrate so as to oppose the first electrode via the liquid crystal layer therebetween. The first electrode includes, in each picture element region, a solid portion including a plurality of unit solid portions, whereby the liquid crystal layer takes a substantially vertical alignment in the absence of an applied voltage between the first electrode and the second electrode, and forms a liquid crystal domain taking a radially-inclined orientation in a region corresponding to each unit solid portion of the first electrode by an inclined electric field produced around the unit solid portion in response to a voltage applied between the first electrode and the second electrode.
    Type: Application
    Filed: May 14, 2004
    Publication date: January 6, 2005
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Akihiro Yamamoto, Takashi Ochi
  • Patent number: 6822724
    Abstract: A liquid crystal display device of a vertical alignment mode is provided in which a quenching pattern, which is generated by such liquid crystal molecules whose in-plane component of the alignment directions under applied voltage is aligned along the cross nicole directions, is unrecognizable for a user. In the liquid crystal display device of a vertical alignment mode, a liquid crystal layer is has a defined value of d/p between 0.0021×(Vmax)2−0.0458×(Vmax)+0.65 and 0.0021×(Vmax)2−0.0458×(Vmax)+0.50, and a defined value of d·&Dgr;n/&lgr; between −0.00026×(Vmax)3+0.016×(Vmax)2−0.2281×(Vmax)+2.124 and −0.00026×(Vmax)3+0.016×(Vmax)2−0.2281××(Vmax)+1.7603, where Vmax [V] is the maximum applied effective voltage applied to the liquid crystal layer.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: November 23, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Ogishima, Masumi Kubo
  • Patent number: 6819379
    Abstract: A liquid crystal display device includes a first substrate; a second substrate; a liquid crystal layer interposed between the first substrate and the second substrate; a first polarizer provided on a surface of the first substrate which is on the opposite side to the liquid crystal layer; a second polarizer provided on a surface of the second substrate which is on the opposite side to the liquid crystal layer; a first phase compensation element provided between the first polarizer and the liquid crystal layer; and a second phase compensation element provided between the second polarizer and the liquid crystal layer. A plurality of pixel areas are provided for display. The first substrate includes at least one transmissive electrode, and the second substrate includes a reflective electrode region and a transmissive electrode region in correspondence with each of the plurality of pixel areas.
    Type: Grant
    Filed: August 13, 2001
    Date of Patent: November 16, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Yozo Narutaki, Shogo Fujioka, Yuko Maruyama, Takayuki Shimada, Youji Yoshimura, Mikio Katayama, Yutaka Ishii, Shinya Yamakawa, Atsushi Ban
  • Publication number: 20040207594
    Abstract: A liquid crystal display device of the present invention includes: a liquid crystal panel, when both of transmittance at the front and transmittance at an oblique viewing angle are 1 in white display, having such display characteristics that transmission intensity at the oblique viewing angle is larger than transmission intensity at the front; and a drive voltage setting section (LUT and drive voltage generation section) which sets a drive voltage to activate the liquid crystal panel and supplies the set drive voltage to the liquid crystal panel. The drive voltage setting section (LUT and drive voltage generation section) sets a drive voltage in accordance with viewing angle characteristics of the liquid crystal panel, thereby controlling viewing angle characteristics. With this arrangement, it is possible to provide a simply-structured liquid crystal display device capable of displays with high definition without decrease in aperture ratios.
    Type: Application
    Filed: March 29, 2004
    Publication date: October 21, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventor: Masumi Kubo
  • Publication number: 20040201810
    Abstract: The liquid crystal display device of this invention includes a plurality of picture element regions each defined by a first electrode provided on a face of a first substrate facing a liquid crystal layer and a second electrode provided on a second substrate so as to oppose the first electrode via the liquid crystal layer sandwiched therebetween. In each of the picture element regions, the first electrode has a plurality of openings and a solid portion, the liquid crystal layer is in a vertical orientation state when no voltage is applied between the first electrode and the second electrode, and when a voltage is applied between the first electrode and the second electrode, a plurality of liquid crystal domains each in a radially-inclined orientation state are respectively formed in the plurality of openings and the solid portion by inclined electrode fields generated at respective edge portions of the openings of the first electrode.
    Type: Application
    Filed: May 6, 2004
    Publication date: October 14, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Akihiro Yamamoto, Takashi Ochi, Tetsuhiro Yamaguchi, Naoshi Yamada, Katsuhiko Morishita, Kiyoshi Ogishima, Kazuhiro Maekawa
  • Patent number: 6788375
    Abstract: The liquid crystal display device of this invention includes a vertical alignment type liquid crystal layer between a first substrate and a second substrate. A picture element region is defined by a first electrode provided on the surface of the first substrate facing the liquid crystal layer and a second electrode provided on the surface of the second substrate facing the liquid crystal layer. The first substrate has at least one first protrusion with an inclined side face on the surface thereof facing the liquid crystal layer in each of the plurality of picture element regions. A portion of the liquid crystal layer included in each of the plurality of picture element regions is in a substantially vertical orientation state under application of no voltage, and includes at least a part of a first liquid crystal domain placed in a radially-inclined orientation state about the first protrusion under voltage application.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: September 7, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Ogishima, Masumi Kubo
  • Publication number: 20040155998
    Abstract: The liquid crystal display device of the present invention includes a first substrate, a second substrate, and a vertical alignment type liquid crystal layer provided between the first substrate and the second substrate, and includes a plurality of picture element regions each defined by a first electrode provided on one side of the first substrate that is closer to the liquid crystal layer and a second electrode provided on the second substrate so as to oppose the first electrode via the liquid crystal layer. The first substrate includes a first orientation-regulating structure in each of the plurality of picture element regions, the first orientation-regulating structure exerting an orientation-regulating force so as to form a plurality of liquid crystal domains in the liquid crystal layer, each of the liquid crystal domains taking a radially-inclined orientation in the presence of an applied voltage.
    Type: Application
    Filed: February 11, 2004
    Publication date: August 12, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Akihiro Yamamoto, Kiyoshi Ogishima, Takashi Ochi, Kazuhiro Maekawa
  • Publication number: 20040150764
    Abstract: The liquid crystal display device of this invention includes a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate and a plurality of picture element regions for producing a display. In each of the plurality of picture element regions, a picture element electrode provided on the face of the first substrate facing the liquid crystal layer and a switching element electrically connected to the picture element electrode are provided. The picture element electrode includes a plurality of sub-picture element electrodes and a plurality of contact portions for mutually electrically connecting at least some of the plurality of sub-picture element electrodes. At least one of the plurality of sub-picture element electrodes is electrically connected to the switching element via a plurality of connection paths.
    Type: Application
    Filed: December 31, 2003
    Publication date: August 5, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Akihiro Yamamoto, Takashi Ochi, Kiyoshi Ogishima, Kazuhiro Maekawa
  • Patent number: 6765641
    Abstract: A display device, with a pair of substrates provided so as to face each other with a display medium interposed therebetween, includes, on a first substrate of the pair of substrates: switching elements disposed in a matrix; scanning lines and signal lines disposed so as to cross each other; and an interlayer insulating film provided so as to have the switching elements, the scanning lines and the signal lines on one surface thereof and pixel electrodes on the other surface thereof. Each of the pixel electrodes is electrically connected to a drain electrode of one of the switching elements via a contact hole which penetrates through the interlayer insulating film. The interlayer insulating film is made of an organic thin film having a high transparency and covers at least the switching elements, the scanning lines and the signal lines.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: July 20, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Yozo Narutaki, Yuko Maruyama, Kazuhiro Maekawa, Takayuki Shimada, Mikio Katayama
  • Publication number: 20040114092
    Abstract: A liquid crystal display device of a vertical alignment mode is provided in which a quenching pattern, which is generated by such liquid crystal molecules whose in-plane component of the alignment directions under applied voltage is aligned along the cross nicole directions, is unrecognizable for a user. In the liquid crystal display device of a vertical alignment mode, a liquid crystal layer is has a defined value of d/p between 0.0021×(Vmax)2−0.0458×(Vmax)+0.65 and 0.0021×(Vmax)2−0.0458×(Vmax)+0.50, and a defined value of d·&Dgr;n/&lgr; between −0.00026×(Vmax)3+0.016×(Vmax)2−0.2281×(Vmax)+2.124 and −0.00026×(Vmax)3+0.016×(Vmax)2−0.2281×(Vmax)+1.7603, where Vmax [V] is the maximum applied effective voltage applied to the liquid crystal layer.
    Type: Application
    Filed: September 4, 2003
    Publication date: June 17, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Ogishima, Masumi Kubo
  • Patent number: 6710827
    Abstract: The present invention provides a liquid crystal display device in which each pixel electrode includes a plurality of sub-pixel electrodes and for which it is easy to correct a short-circuit defect, and a method for correcting such a defect. A pixel electrode includes a transparent electrode (first sub-pixel electrode) and a reflection electrode (second sub-pixel electrode). The distance between the transparent electrode and a counter electrode is greater than the distance between the reflection electrode and the counter electrode. The reflection electrode is connected to the drain electrode via a connection line provided separately from a path which electrically connects the transparent electrode to the drain electrode.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: March 23, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Yasunobu Akebi
  • Patent number: 6710825
    Abstract: The liquid crystal display device of this invention includes a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate and a plurality of picture element regions for producing a display. In each of the plurality of picture element regions, a picture element electrode provided on the face of the first substrate facing the liquid crystal layer and a switching element electrically connected to the picture element electrode are provided. The picture element electrode includes a plurality of sub-picture element electrodes and a plurality of contact portions for mutually electrically connecting at least some of the plurality of sub-picture element electrodes. At least one of the plurality of sub-picture element electrodes is electrically connected to the switching element via a plurality of connection paths.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: March 23, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Akihiro Yamamoto, Takashi Ochi, Kiyoshi Ogishima, Kazuhiro Maekawa
  • Publication number: 20040041963
    Abstract: The liquid crystal display device of this invention includes a first substrate, a second substrate, and a vertical alignment type liquid crystal layer including liquid crystal molecules having negative dielectric anisotropy disposed between the two substrates. In each of a plurality of picture-element regions, the liquid crystal layer has a plurality of liquid crystal regions different in the direction in which liquid crystal molecules tilt upon application of a voltage. At least one of the first and second substrates has a light-shield layer overlapping at least part of boundary region defined as regions separating the plurality of liquid crystal regions from each other. The part of the boundary region overlapping the light-shield layer is a region permitting liquid crystal molecules surrounding the region to tilt so that the ends of the liquid crystal molecules closer to the substrate having the light-shield layer go away from the region upon application of a voltage.
    Type: Application
    Filed: August 27, 2003
    Publication date: March 4, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Ogishima, Masumi Kubo
  • Publication number: 20040041770
    Abstract: A liquid crystal display device includes picture element regions defined each by a first electrode and a second electrode opposing the first electrode via the liquid crystal layer therebetween. The first electrode includes, in each picture element region, a plurality of unit solid portions arranged in a first direction, whereby the liquid crystal layer takes a vertical alignment in the absence of an applied voltage, and forms a liquid crystal domain taking a radially-inclined orientation in each unit solid portion by an inclined electric field produced around the unit solid portion in response to an applied voltage. The picture element regions are arranged in a matrix pattern including a rows extending in the second direction different from the first direction and columns extending in the first direction, and picture elements adjacent to each other in the second direction are driven with voltages of opposite polarities in each frame.
    Type: Application
    Filed: June 23, 2003
    Publication date: March 4, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Masumi Kubo, Kiyoshi Ogishima
  • Publication number: 20040021807
    Abstract: A color filter layer includes a first region and a second region, wherein the number of times that light used for display is transmitted through the color filter layer is different between the first region and the second region.
    Type: Application
    Filed: July 15, 2003
    Publication date: February 5, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Yozo Narutaki, Masumi Kubo, Shogo Fujioka, Takayuki Shimada, Mikio Katayama, Youjii Yoshimura, Yutaka Ishii
  • Patent number: 6624860
    Abstract: A color filter layer includes a first region and a second region, wherein the number of times that light used for display is transmitted through the color filter layer is different between the first region and the second region.
    Type: Grant
    Filed: October 25, 2000
    Date of Patent: September 23, 2003
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yozo Narutaki, Masumi Kubo, Shogo Fujioka, Takayuki Shimada, Mikio Katayama, Youji Yoshimura, Yutaka Ishii
  • Publication number: 20030169391
    Abstract: The liquid crystal display device of the invention includes: a liquid crystal layer taking on a roughly vertically aligned state in the black display state: first and second polarizing plates placed to face each other so that the transmission axes are orthogonal to each other; at least one first phase plate placed between the liquid crystal layer and the first polarizing plate and/or the second polarizing plate; at least one second phase plate placed between the first phase plate and the first or second polarizing plate whichever is farther from the first phase plate; and an illuminator for illuminating the liquid crystal layer with light via the first or second polarizing plate.
    Type: Application
    Filed: March 3, 2003
    Publication date: September 11, 2003
    Inventors: Toshihisa Uchida, Koichi Miyachi, Masumi Kubo, Nobuhiko Nakai, Hidehiko Ohkura