Patents by Inventor Fumiaki Yamada

Fumiaki Yamada 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: 20050041174
    Abstract: A color filterless display device performing color display for expressing one pixel by three RGB sub-pixels includes: a light source; a diffraction grating for separating a light irradiated from this light source into lights of a plurality of wavelength regions; a cylindrical lens array for receiving the separated light and condensing the light while corresponding to each of the sub-pixels; and a liquid crystal cell including a structure portion for correcting an angle of the condensed light for all sub-pixels, wherein, in the structure portion of this liquid crystal cell, a side onto which a light from the cylindrical lens array is made incident is made of a high refractive index layer, an emitting side from which the light is emitted is made of a low refractive index layer, and a Fresnel-type microprism structure is formed by the high refractive index layer and the low refractive index layer.
    Type: Application
    Filed: August 5, 2004
    Publication date: February 24, 2005
    Applicant: International Business Machines Corporation
    Inventors: Hidetoshi Numata, Shinya Ono, Fumiaki Yamada, Yoichi Taira
  • Publication number: 20040114396
    Abstract: An illumination device is provided which can reduce a movement blur and a tailing phenomenon on a motion picture display while a drop in display brightness is suppressed, and which can suppress power consumption, can be made small and light, and can prolong the lifetime, and a liquid crystal display device using the same is provided. A light source control part of a control circuit synchronizes a latch pulse signal outputted from a gate driver control part to a gate driver, and outputs light emission control signals to respective light source power supply circuits. The respective light source power supply circuits change emission states of cold cathode fluorescent lamps to one of a first to a third emission states on the basis of the inputted light emission control signals, and illuminate an LCD panel from a rear surface of a display area.
    Type: Application
    Filed: October 29, 2003
    Publication date: June 17, 2004
    Applicant: FUJITSU DISPLAY TECHNOLOGIES CORPORATION
    Inventors: Tetsuya Kobayashi, Toshihiro Suzuki, Mari Sugawara, Tetsuya Hamada, Keiji Hayashi, Fumiaki Yamada, Yasutake Furukoshi, Masanori Nishido
  • Publication number: 20040105046
    Abstract: A backlight apparatus (and light guide and liquid crystal display apparatus incorporating the same) includes a wedge-type light guide having a refractive index n1, and having a top surface, a bottom surface and a side surface, a light source for directing light to the side surface of the wedge-type light guide, a first light transmission layer having a refractive index n2, which is smaller than said refractive index n1, and having a top surface and a bottom surface, wherein the top surface of the first light transmission layer is attached to the bottom surface of the wedge-type light guide, and a light deflecting layer having a top surface attached to the bottom surface of the first light transmission layer for deflecting the incident light from the first light transmission layer toward the top surface of the wedge-type light guide.
    Type: Application
    Filed: November 17, 2003
    Publication date: June 3, 2004
    Applicant: International Business Machines Corporation
    Inventors: Yoichi Taira, Fumiaki Yamada, Akiko Nishikai
  • Patent number: 6667782
    Abstract: A backlight apparatus (and light guide and liquid crystal display apparatus incorporating the same) includes a wedge-type light guide having a refractive index n1, and having a top surface, a bottom surface and a side surface, a light source for directing light to the side surface of the wedge-type light guide, a first light transmission layer having a refractive index n2, which is smaller than said refractive index n1, and having a top surface and a bottom surface, wherein the top surface of the first light transmission layer is attached to the bottom surface of the wedge-type light guide, and a light deflecting layer having a top surface attached to the bottom surface of the first light transmission layer for deflecting the incident light from the first light transmission layer toward the top surface of the wedge-type light guide.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: December 23, 2003
    Assignee: International Business Machines Corporation
    Inventors: Yoichi Taira, Fumiaki Yamada, Akiko Nishikai
  • Publication number: 20030210540
    Abstract: A lighting device includes a light source, a light conducting plate having an incident surface receiving light emitted from the light source, a back surface and a light-emitting surface, and a reflection member having a first portion facing the back surface, and a second portion located on a side opposite to a side of the light conducting plate on which the light source is located. The second portion is spaced apart from the light conducting plate so that light emitted from the light conducting plate is oriented toward an emission surface of the lighting device.
    Type: Application
    Filed: May 30, 2003
    Publication date: November 13, 2003
    Applicant: Fujitsu Limited
    Inventors: Fumiaki Yamada, Shinpei Nagatani, Masaki Miyahara, Eiji Nittou
  • Publication number: 20030193463
    Abstract: Provided are a color display driving principle obtained while taking into account a difference in eye sensitivity to the flickering of differently colored lights, a TFT liquid crystal display module structure that is adequate for this method, and a double-panel projection type display device.
    Type: Application
    Filed: May 6, 2003
    Publication date: October 16, 2003
    Inventors: Fumiaki Yamada, Yoshitami Sakaguchi
  • Patent number: 6612709
    Abstract: A lighting device includes a light source, a light conducting plate having an incident surface receiving light emitted from the light source, a back surface and a light-emitting surface, and a reflection member having a first portion facing the back surface, and a second portion located on a side opposite to a side of the light conducting plate on which the light source is located. The second portion is spaced apart from the light conducting plate so that light emitted from the light conducting plate is oriented toward an emission surface of the lighting device.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: September 2, 2003
    Assignee: Fujitsu Display Technologies Corporation
    Inventors: Fumiaki Yamada, Shinpei Nagatani, Masaki Miyahara, Eiji Nittou
  • Patent number: 6600528
    Abstract: A display device provides a first optical device disposed in a light path for spatially separating angularly separated light into color components, and a pixel which receives each of the color components through a sub-pixel. Each sub-pixel controls transmitted light intensity therethrough. A black matrix is formed in operative relationship with the sub-pixels including apertures for receiving the color components. A microstructured layer is disposed in the light path and receives or transmits the color components from or to the apertures of the black matrix. The microstructured layer includes tilted and/or curved surfaces for redirecting laterally shifted color components shifted by the first optical device and may also diffuse light.
    Type: Grant
    Filed: December 19, 2000
    Date of Patent: July 29, 2003
    Assignee: International Business Machines Corporation
    Inventors: Evan G. Colgan, Rama N. Singh, Yoichi Taira, Robert L. Wisnieff, Fumiaki Yamada
  • Patent number: 6556181
    Abstract: Provided are a color display driving principle obtained while taking into account a difference in eye sensitivity to the flickering of differently colored lights, a TFT liquid crystal display module structure that is adequate for this method, and a double-panel projection type display device. The count of the G (green) color data that can be written is increased compared with the count for the other primary colors, or the display period for green can be extended. The repetitive unit is set to R, G, B and G, so that a satisfactory refresh rate can be set for the important color G. Therefore, the overall refresh frequency and the power consumed by the display device can be reduced without deterioration of the display quality, and requests for the time response speeds by the display device can be reduced.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: April 29, 2003
    Assignee: International Business Machines Corporation
    Inventors: Fumiaki Yamada, Yoshitami Sakaguchi
  • Publication number: 20030062814
    Abstract: The present invention relates to a light source device including discharge tubes that emit light by discharging in a thin atmosphere, a method of producing the light source device, and a display apparatus in which the light source device is employed. This light source device includes discharge tubes and a heat conductive member that is brought into contact with the neighboring area of the electrodes of the discharge tubes so as to locally cool down the neighboring area of the electrodes. In the light source device, a low heat conductivity member having lower heat conductivity than the heat conductive member is interposed between the heat conductive member and the discharge tubes. With such a structure, the luminance in the entire light source device can be increased and made uniform, and the reliability of the light source device can be increased accordingly.
    Type: Application
    Filed: March 28, 2002
    Publication date: April 3, 2003
    Applicant: FUJITSU LIMITED
    Inventors: Tetsuya Kobayashi, Keiji Hayashi, Koshu Yonemura, Fumiaki Yamada, Kazumasa Kaiwa, Hiroyoshi Takahashi, Toshihiro Suzuki, Takeshi Gotoh, Tetsuya Hamada, Mari Sugawara, Seiji Hayashimoto
  • Publication number: 20020180686
    Abstract: A liquid crystal display device converts input signals into liquid crystal drive signals so as to display an image on a liquid crystal panel. A plurality of flexible boards are connected to the liquid crystal panel, each of the flexible boards having a drive IC which converts the input signals into the liquid crystal drive signals. A connection board is connected to the liquid crystal panel so as to supply the input signals to first input lines formed on the liquid crystal panel. Each of the flexible boards has second input signal lines for supplying the input signals to the drive IC; a first end of each of the second input signal lines is connected to a respective one of a first group of the first input signal lines.
    Type: Application
    Filed: March 19, 2002
    Publication date: December 5, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Takashi Yuda, Akifumi Matsunaga, Fumiaki Yamada, Koshu Yonemura, Toshiaki Suzuki, Kazuhiro Nukiyama, Toshiaki Naka, Satoshi Sekido, Yasutake Furukoshi, Syouichi Fukutoku
  • Patent number: 6448951
    Abstract: A low cost LCD device employing a high speed field sequential drive scheme.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: September 10, 2002
    Assignee: International Business Machines Corporation
    Inventors: Yoshitami Sakaguchi, Fumiaki Yamada, Yoichi Taira
  • Publication number: 20020113764
    Abstract: Provided are a color display driving principle obtained while taking into account a difference in eye sensitivity to the flickering of differently colored lights, a TFT liquid crystal display module structure that is adequate for this method, and a double-panel projection type display device.
    Type: Application
    Filed: May 14, 1999
    Publication date: August 22, 2002
    Inventors: FUMIAKI YAMADA, YOSHITAMI SAKAGUCHI
  • Publication number: 20020075427
    Abstract: A display device provides a first optical device disposed in a light path for spatially separating angularly separated light into color components, and a pixel which receives each of the color components through a sub-pixel. Each sub-pixel controls transmitted light intensity therethrough. A black matrix is formed in operative relationship with the sub-pixels including apertures for receiving the color components. A microstructured layer is disposed in the light path and receives or transmits the color components from or to the apertures of the black matrix. The microstructured layer includes tilted and/or curved surfaces for redirecting laterally shifted color components shifted by the first optical device and may also diffuse light.
    Type: Application
    Filed: December 19, 2000
    Publication date: June 20, 2002
    Inventors: Evan G. Colgan, Rama N. Singh, Yoichi Taira, Robert L. Wisnieff, Fumiaki Yamada
  • Publication number: 20010012202
    Abstract: A lighting device includes a light source, a light conducting plate having an incident surface receiving light emitted from the light source, a back surface and a light-emitting surface, and a reflection member having a first portion facing the back surface, and a second portion located on a side opposite to a side of the light conducting plate on which the light source is located. The second portion is spaced apart from the light conducting plate so that light emitted from the light conducting plate is oriented toward an emission surface of the lighting device.
    Type: Application
    Filed: September 11, 1997
    Publication date: August 9, 2001
    Inventors: FUMIAKI YAMADA, SHINPEI NAGATANI, MASAKI MIYAHARA, EIJI NITTOU
  • Patent number: 5982526
    Abstract: An energy application apparatus and a method to operate at high speed that makes high usage of light. An exposure apparatus includes a laser oscillator, an optical shutter, imaging lenses, a screen, a vertical deflecting device, a horizontal deflecting device, a vertical moving device, a liquid crystal panel, and a controller. A light beam emitted from the laser oscillator passes through the optical shutter when in its open position, and is directed by the imaging lens onto the slit or pattern on the screen. After passing through the slit, the light is gradually made to converge by the imaging lens and to enter the galvanomirror. The galvanomirror deflects the beam by a predetermined angle in the vertical direction, and the deflected beam enters the galvanomirror. The galvanomirror deflects the beam by a predetermined angle in the horizontal direction. Thereafter, the beam exposes a desired location of the liquid crystal panel located on the stage to form an image thereon.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: November 9, 1999
    Assignee: International Business Machines Corporation
    Inventors: Fumiaki Yamada, Yoichi Taira
  • Patent number: 5863114
    Abstract: A light emissive panel unit includes a light source for emitting light, a prism plate into which the light emitted by the light source means incident, a part of the light being reflectable and another part of the light passing through the prism plate, and an adjusting element for partially adjusting an amount of light emitted from a surface of the prism plate.
    Type: Grant
    Filed: March 7, 1994
    Date of Patent: January 26, 1999
    Assignee: Fujitsu Limited
    Inventors: Shinpei Nagatani, Fumiaki Yamada, Masaki Miyahara, Motohiko Fukuhara, Katsunori Tanaka
  • Patent number: 5835249
    Abstract: An energy application apparatus and a method to operate at high speed that makes high usage of light. An exposure apparatus includes a laser oscillator, an optical shutter, imaging lenses, a screen, a vertical deflecting device, a horizontal deflecting device, a vertical moving device, a liquid crystal panel, and a controller. A light beam emitted from the laser oscillator passes through the optical shutter when in its open position, and is directed by the imaging lens onto the slit or pattern on the screen. After passing through the slit, the light is gradually made to converge by the imaging lens and to enter the galvanomirror. The galvanomirror deflects the beam by a predetermined angle in the vertical direction, and the deflected beam enters the galvanomirror. The galvanomirror deflects the beam by a predetermined angle in the horizontal direction. Thereafter, the beam exposes a desired location of the liquid crystal panel located on the stage to form an image thereon.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: November 10, 1998
    Assignee: International Business Machines Corporation
    Inventors: Fumiaki Yamada, Yoichi Taira
  • Patent number: 5799126
    Abstract: An object of the present invention is to provide a light guide device which can emit light rays of high directivity with high efficiency irrespective of incident angles, and a light source device using the light guide device which can provide light rays of high directivity with high efficiency irrespective of emitting characteristics of light source lamps, and a liquid crystal display device which is small-sized and can display at very high luminance and is free from color tone changes depending on visual angles over a wide field angle.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: August 25, 1998
    Assignee: Fujitsu Limited
    Inventors: Shinpei Nagatani, Fumiaki Yamada, Motohiko Fukuhara
  • Patent number: 5764845
    Abstract: An object of the present invention is to provide a light guide device which can emit light rays of high directivity with high efficiency irrespective of incident angles, and a light source device using the light guide device which can provide light rays of high directivity with high efficiency irrespective of emitting characteristics of light source lamps, and a liquid crystal display device which is small-sized and can display at very high luminance and is free from color tone changes depending on visual angles over a wide field angle. A substantial point light source is contained in a reflection box having an inside wall coated with a silver reflecting surface and an opening in the shape of a pinhole formed in a surface of the reflection box, and the light guide device is provided in the pinhole-shaped opening. The light guide device is a cylindrical transparent body. An incident end surface of the light guide device has a 1 mm-diameter, and an exit end surface of the light guide device has a 6.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: June 9, 1998
    Assignee: Fujitsu Limited
    Inventors: Shinpei Nagatani, Fumiaki Yamada, Motohiko Fukuhara