Patents by Inventor Shigesumi Araki

Shigesumi Araki 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: 8674949
    Abstract: A liquid crystal display apparatus includes a display panel configured to have a plurality of scanning lines for which liquid crystal display elements each containing an optical input device and a display pixel are arranged, respectively, a backlight configured to be arranged facing the display panel to illuminate the display panel, and a control part configured to control writing into the display pixel and reading of a detection signal of the optical input device, wherein the control part displays an external light detection image substantially shielding light from the backlight on the display pixels throughout a first period of a frame period, and displays a display image on the display pixels throughout a second period of the frame period.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: March 18, 2014
    Assignee: Japan Displays Inc.
    Inventors: Kenji Nakao, Yasuyuki Tsuji, Mitsutaka Okita, Shigesumi Araki
  • Patent number: 8648898
    Abstract: According to one embodiment, stereoscopic liquid crystal shutter glasses include a left-eye liquid crystal shutter and a right-eye liquid crystal shutter. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a response time not more than 5 milliseconds. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a contrast ratio not less than 350:1. The contrast ratio is a value at an angle of sight of 30 degrees in left direction and in right direction.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: February 11, 2014
    Assignee: Japan Display Inc.
    Inventors: Kazuhiro Nishiyama, Mitsutaka Okita, Shigesumi Araki, Toshiyuki Higano
  • Publication number: 20130321752
    Abstract: According to one embodiment, a liquid crystal display device includes a first substrate including a common electrode, and a pixel electrode which includes a central slit and a peripheral slit which are opposed to the common electrode. The central slit and the peripheral slit are arranged in a first direction and extend in a second direction crossing the first direction, the central slit being formed at a central part of the pixel electrode and having a first width in the first direction, and the peripheral slit being formed at a peripheral part of the pixel electrode and having a second width in the first direction which is less than the first width.
    Type: Application
    Filed: May 30, 2013
    Publication date: December 5, 2013
    Inventors: Youichi ASAKAWA, Shigesumi ARAKI
  • Patent number: 8570448
    Abstract: In one embodiment, a liquid crystal shutter includes a first liquid crystal panel for left eye and a second liquid crystal panel for right eye. Each liquid crystal panel includes a pair of electrode substrates and a liquid crystal layer held between the electrode substrates. A driving circuit switches the first and second liquid crystal panels between a transmissive state and a non-transmissive state by turns by applying a voltage to the first and second liquid crystal panels while inversing the polarity of the voltage applied between the pair of the electrode substrates at least once during a period in the transmissive state.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: October 29, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Mitsutaka Okita, Shigesumi Araki, Emi Higano
  • Publication number: 20130258241
    Abstract: According to one embodiment, a liquid crystal display apparatus includes a display panel, an illumination module which illuminates the display panel, a display controller which controls gradation display which corresponds to an image signal in a first subframe period, and non-gradation display which does not correspond to the image signal in a second subframe period, and performs control in a manner that scanning starting from an upper end and going toward center of the display panel and scanning starting from a lower end and going toward the center of the display panel are alternately performed, and an illumination controller which controls turning on/off of the illumination module.
    Type: Application
    Filed: March 14, 2013
    Publication date: October 3, 2013
    Inventors: Emi HIGANO, Shigesumi Araki, Kazuhiro Nishiyama, Daiichi Suzuki
  • Patent number: 8547486
    Abstract: A liquid crystal shutter includes a first support substrate having a first electrode and a second support substrate having a second electrode opposite to the first electrode. A liquid crystal layer is sandwiched between the first and second electrodes so as to have a switching region. The switching region becomes a bend alignment state from a splay alignment state when a voltage is applied to the liquid crystal layer. A nucleus region formation portion is arranged on the first support substrate to form a nucleus region in the switching region corresponding to the nucleus region formation portion in the liquid crystal layer, in which the splay alignment is more stable than in the switching region.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: October 1, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Tetsuya Kojima, Toshiyuki Higano, Shigesumi Araki, Tetsuo Fukami, Kazuhiro Nishiyama
  • Publication number: 20130241975
    Abstract: According to one embodiment, a liquid crystal display includes first light sources disposed side by side in a scan direction, a first light guide to guide the light emitted from the first light sources in a first direction, second light sources disposed side by side in the scan direction, a second light guide to guide the light emitted from the second light sources in a second direction, and a light source driver to independently turn on and turn off the first and second light sources. The light source driver sequentially turns on and turns off the first light sources in a first period. The light source driver sequentially turns on and turns off the second light sources in a second period.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 19, 2013
    Inventors: Shigesumi ARAKI, Kazuhiro Nishiyama, Noriyoshi Kanda, Kenji Nakao
  • Patent number: 8477127
    Abstract: A liquid crystal display device includes a display portion having a first substrate, a second substrate opposing to the first substrate, a liquid crystal layer held between the first and second substrates, and a plurality of pixels arranged in a delta shape. A plurality of pixel electrodes are respectively connected to signal lines extending in a first direction via a switch. The switch is controlled by scanning lines extending in a second direction which orthogonally crosses the first direction. The signal lines extend in a space between the pixel electrodes in a meandering shape in the second direction, and two kinds of color pixels are connected with a common signal line in turn via the pixel switch.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: July 2, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Yukio Tanaka, Tetsuo Fukami, Emi Higano, Shigesumi Araki, Ken Shiiba
  • Publication number: 20130113693
    Abstract: According to one embodiment, a display includes a first substrate including a scan line, a signal line, a pixel electrode including first electrodes extending substantially parallel to the signal line, a common electrode including second electrodes extending parallel to the first electrode between the first electrodes and arranged with a predetermined space between each second electrode and the adjacent first electrode, and a shielding portion at least arranged between the signal line and the first electrode arranged near the signal line, a second substrate including a light shielding layer having a width identical to a width of the shielding portion and arranged opposite the signal line, in a direction substantially orthogonal to the signal line, and a liquid crystal layer.
    Type: Application
    Filed: November 6, 2012
    Publication date: May 9, 2013
    Inventors: Shigesumi ARAKI, Norihisa MAEDA, Tatsuya WAKIMOTO, Kazuhiro NISHIYAMA
  • Publication number: 20130107184
    Abstract: According to one embodiment, a display includes a first substrate including a scan line, a signal line crossing the scan line, a pixel electrode including first electrodes extending in a direction in which the signal line extends and arranged side by side in the direction in which the scan line extends, a common electrode including second electrodes extending in the direction in which the signal line extends between the first electrodes and arranged with a predetermined space to the first electrodes, and a shielding portion arranged at least between the signal line and the first electrodes arranged near the signal line and to which a same voltage as that of the common electrode is applied, second substrate arranged opposite to the first substrate, and a liquid crystal layer.
    Type: Application
    Filed: November 1, 2012
    Publication date: May 2, 2013
    Inventors: Norihisa MAEDA, Kazuhiro NISHIYAMA, Shigesumi ARAKI, Nami UYAMA, Tatsuya WAKIMOTO
  • Patent number: 8432340
    Abstract: A liquid crystal display device includes a reflective display part and a transmissive display part in each of a plurality of matrix-arrayed pixels. The liquid crystal display device includes a liquid crystal display panel which is configured such that a liquid crystal layer is held between a pair of substrates and gradation display is performed in accordance with a pixel voltage which is applied to the liquid crystal layer of each pixel, a backlight which illuminates the liquid crystal display panel, a sensor unit which detects brightness of ambient light, and a voltage setting unit which sets the pixel voltage relative to each of input gradation levels, on the basis of the brightness that is detected by the sensor unit.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: April 30, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Mitsutaka Okita, Kazuhiro Nishiyama, Shigesumi Araki, Emi Kisara
  • Publication number: 20120327352
    Abstract: According to one embodiment, a liquid crystal display apparatus includes a first substrate including a pixel electrode including comb-like projections extending in a first direction and arranged in a second direction substantially perpendicular to the first direction, a common electrode including comb-like projections extending in the first direction between the comb-like projections of the pixel electrode and arranged with a predetermined spacing from the comb-like projections of the pixel electrode, a second substrate arranged opposite to the first substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate. A space width between the comb-like projection of the pixel electrode and the comb-like projection of the common electrode of end portion in the second direction is greater than a space width between the comb-like projection of the pixel electrode and the comb-like projection of the common electrode in a center portion.
    Type: Application
    Filed: March 7, 2012
    Publication date: December 27, 2012
    Inventors: Nami UYAMA, Tatsuya Wakimoto, Norihisa Maeda, Shigesumi Araki, Kazuhiro Nishiyama
  • Patent number: 8237901
    Abstract: A liquid crystal display device includes an OCB mode liquid crystal display panel, and an optical compensation element which is disposed outside of the liquid crystal display layer. The optical compensation element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal layer, and a second retardation plate which is disposed between the polarizer plate and the first retardation plate and has a biaxial refractive index anisotropy. The optical compensation element compensates a difference of a polarization state that differs between azimuth directions of light passing through the liquid crystal layer and compensates a shift of the polarization state of light, which passes through the retardation plate, from an azimuth direction of an absorption axis of the polarizer plate.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: August 7, 2012
    Assignee: Japan Display Central Inc.
    Inventors: Emi Kisara, Kazuhiro Nishiyama, Mitsutaka Okita, Shigesumi Araki
  • Patent number: 8223299
    Abstract: The OCB mode liquid crystal display device applies a black display voltage V(Tr) with temperature characteristic requirements expressed by: V(T)=<Vs(T), and V(Tr??T)=V(T)=<Vs(Tr), where T represents a panel temperature of the liquid crystal panel, Tr represents a sensed temperature, ?T represents a temperature difference between the panel temperature and the sensed temperature, and Vs(T) represents an optimal black display voltage.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: July 17, 2012
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Shigesumi Araki, Kazuhiro Nishiyama, Mitsutaka Okita, Daiichi Suzuki
  • Patent number: 8189148
    Abstract: A transflective liquid crystal display device includes a liquid crystal display panel which is configured such that a liquid crystal layer is held between a pair of substrates, and to which an OCB mode is applied, and a pair of optical elements which are disposed on outsides of the liquid crystal layer, and optically compensate a retardation of the liquid crystal layer in a predetermined display state in which a voltage is applied to the liquid crystal layer, wherein the optical element is configured to include a circular polarization element including a polarizer and a first retardation plate which imparts a retardation of ΒΌ wavelength, and the first retardation plate has such wavelength dispersion characteristics as to establish a relationship, ?1<1, where ?1 is a ratio of an in-plane retardation Re430 at a wavelength of 430 nm to an in-plane retardation Re550 at a wavelength of 550 nm.
    Type: Grant
    Filed: May 15, 2008
    Date of Patent: May 29, 2012
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Emi Higano, Kazuhiro Nishiyama, Mitsutaka Okita, Shigesumi Araki
  • Publication number: 20120038870
    Abstract: A liquid crystal display device includes an OCB mode liquid crystal display panel, and an optical compensation element which is disposed outside of the liquid crystal display layer. The optical compensation element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal layer, and a second retardation plate which is disposed between the polarizer plate and the first retardation plate and has a biaxial refractive index anisotropy. The optical compensation element compensates a difference of a polarization state that differs between azimuth directions of light passing through the liquid crystal layer and compensates a shift of the polarization state of light, which passes through the retardation plate, from an azimuth direction of an absorption axis of the polarizer plate.
    Type: Application
    Filed: October 27, 2011
    Publication date: February 16, 2012
    Inventors: Emi KISARA, Kazuhiro Nishiyama, Mitsutaka Okita, Shigesumi Araki
  • Publication number: 20110242101
    Abstract: According to one embodiment, stereoscopic liquid crystal shutter glasses include a left-eye liquid crystal shutter and a right-eye liquid crystal shutter. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a response time not more than 5 milliseconds. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a contrast ratio not less than 350:1. The contrast ratio is a value at an angle of sight of 30 degrees in left direction and in right direction.
    Type: Application
    Filed: March 28, 2011
    Publication date: October 6, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Kazuhiro NISHIYAMA, Mitsutaka Okita, Shigesumi Araki, Toshiyuki Higano
  • Publication number: 20110242651
    Abstract: According to one embodiment, stereoscopic liquid crystal shutter glasses include a left-eye liquid crystal shutter and a right-eye liquid crystal shutter. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a response time not more than 5 milliseconds. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a contrast ratio not less than 40:1. The contrast ratio is a value at an angle of sight of 35 degrees in all directions.
    Type: Application
    Filed: March 28, 2011
    Publication date: October 6, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Kazuhiro NISHIYAMA, Mitsutaka Okita, Shigesumi Araki, Toshiyuki Higano
  • Publication number: 20110242089
    Abstract: In one embodiment, the liquid crystal shutter is equipped with a first liquid crystal panel in the OCB mode to control the transmissivity of the light entering into left eye and a second liquid crystal panel in the OCB mode to control the transmissivity of the light entering into right eye, and a drive portion to control the transmissivity. The drive portion applies a normal voltage of a normal drive in a pulse shape and a retention voltage having a pulse shape with lower frequency than the normal voltage or lower voltage than normal voltage to the first liquid crystal panel and the second liquid crystal panel. The drive portion switches between the normal drive and the retention drive while maintaining bend alignment state.
    Type: Application
    Filed: March 29, 2011
    Publication date: October 6, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Hirohisa Miki, Shigesumi Araki, Kazuhiro Nishiyama, Tetsuya Kojima, Kenji Nakao
  • Publication number: 20110149182
    Abstract: In one embodiment, a pair of liquid crystal shutter glasses include a first liquid crystal shutter and a second liquid crystal shutter. The first and second liquid crystal shutters are switched to a transmissive state by turns. The respective first and second liquid crystal shutters include a first electrode substrate and a second electrode substrate opposing the first electrode substrate. An OCB (Optically Compensated Bend) mode liquid crystal layer is held between the first and second electrode substrates. The first electrode substrate includes a first electrode and a second electrode arranged adjacent to the first electrode. The first and second electrodes respectively include a side opposing each other and a plurality of projecting portions provided to the respective opposing sides of the first and second electrodes alternately.
    Type: Application
    Filed: December 21, 2010
    Publication date: June 23, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Tetsuo Fukami, Shigesumi Araki, Tetsuya Kojima, Toshiyuki Higano, Kenji Nakao