Patents by Inventor Motofumi Ikeda

Motofumi Ikeda 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: 7965259
    Abstract: A plasma display device in which a sustain pulse having a leading period is applied between row electrodes forming each row electrode pair by a number of times previously determined for each subfield, in a sustain period, and a length of the leading period of the sustain pulse is set in accordance with an accumulated light emission time or an accumulated use time of the plasma display panel.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: June 21, 2011
    Assignee: Panasonic Corporation
    Inventors: Masatsugu Onizuka, Motofumi Ikeda, Yoshichika Sato, Tsutomu Tokunaga
  • Patent number: 7852296
    Abstract: A plasma display device in which at least one of a first sustain pulse having a first leading period and a second sustain pulse having a second leading period shorter than the first leading period is applied between row electrodes forming each row electrode pair by a number of times previously determined for each subfield, in a sustain period, and an application ratio between the first sustain pulse and the second sustain pulse in the sustain period of each subfield is changed in accordance with a luminance level of a video signal.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: December 14, 2010
    Assignee: Panasonic Corporation
    Inventors: Yoshichika Sato, Tsutomu Tokunaga, Motofumi Ikeda, Masatsugu Onizuka
  • Patent number: 7834820
    Abstract: A plasma display device which allows to make longer a leading period of each sustain pulse belonging to a first group including at least a sustain pulse to be applied secondly in a sustain period of each subfield as compared to a leading period of each sustain pulse belonging to another group including at least one sustain pulse to be applied thirdly or later.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: November 16, 2010
    Assignee: Panasonic Corporation
    Inventors: Motofumi Ikeda, Kazuaki Sakata
  • Publication number: 20100245303
    Abstract: A plasma display device in which a sustain pulse having a leading period is applied between row electrodes forming each row electrode pair by a number of times previously determined for each subfield, in a sustain period, and a length of the leading period of the sustain pulse is set in accordance with an accumulated light emission time or an accumulated use time of the plasma display panel.
    Type: Application
    Filed: June 10, 2010
    Publication date: September 30, 2010
    Inventors: Masatsugu ONIZUKA, Motofumi Ikeda, Yoshichika Sato, Tsutomu Tokunaga
  • Patent number: 7777695
    Abstract: A plasma display device which selectively generates address discharge in each display cell in accordance with pixel data based on a video signal in an address period, applies a sustain pulse between row electrodes forming each row electrode pair in a sustain period, and applies, in the sustain period, a discharge timing control pulse to one row electrode of each row electrode pair, so that the discharge timing control pulse partly overlaps with a first sustain pulse in terms of time, which is applied to the other row electrode of each row electrode pair.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: August 17, 2010
    Assignee: Panasonic Corportion
    Inventors: Motofumi Ikeda, Yoshichika Sato, Nobuhiko Saegusa, Shigeru Iwaoka
  • Patent number: 7742018
    Abstract: A plasma display device which selectively generates address discharge in each display cell in accordance with pixel data based on a video signal in an address period, applies a sustain pulse between row electrodes forming each row electrode pair in a sustain period, and applies a wall-charge adjusting pulse between row electrodes forming each of said row electrode pairs in a period from an end of the address period to a beginning of the sustain period.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: June 22, 2010
    Assignee: Panasonic Corporation
    Inventors: Motofumi Ikeda, Yoshichika Sato
  • Patent number: 7724213
    Abstract: A plasma display device is provided which can stabilize discharge and improve display quality. In the plasma display device, a rear edge part of a sustain pulse to be applied at the end of a sustain period of each of the subfields is formed of a first section in which a voltage value slowly changes from a peak voltage value of the sustain pulse to a predetermined first voltage value, a second section in which the first voltage value is maintained for a predetermined period, and a third section in which the voltage value slowly changes from the first voltage value to a second voltage value having polarity different from that of the first voltage value.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: May 25, 2010
    Assignee: Panasonic Corporation
    Inventors: Motofumi Ikeda, Kazuaki Sakata, Masatsugu Onizuka
  • Patent number: 7667670
    Abstract: A plasma display which can reduce the cost of a heat dissipating structure for a driver IC. A magnesium oxide layer is formed on a surface in contact with a discharge space in each of display cells of a PDP. The magnesium oxide film includes magnesium oxide crystals which are excited by electron beams irradiated thereto to emit cathode luminescence light having a peak in a wavelength range of 200 to 300 nm. Further, a pixel data pulse generator circuit for applying column electrodes with pixel data pulses in accordance with pixel data is divided into and built in a plurality of IC chips. Each of these IC chips is mounted on one of a plurality of flexible wiring boards which are connected to the power supply line and column electrodes, respectively.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: February 23, 2010
    Assignee: Panasonic Corporation
    Inventors: Mitsushi Kitagawa, Kazuaki Sakata, Motofumi Ikeda
  • Publication number: 20080074354
    Abstract: A plasma display apparatus in which in an address period, address discharge is generated in each display cell of a display panel selectively in accordance with pixel data based on a video signal, and in a sustain period, a sustain pulse for sustain discharge is applied between row electrodes constituting the row electrode pairs by a predetermined number of times which is preset for each of the subfields, and a length of a front-edge period of the sustain pulse to be applied is adjusted subfield by subfield in accordance with a load level in each subfield.
    Type: Application
    Filed: September 11, 2007
    Publication date: March 27, 2008
    Inventors: Kazuo Yahagi, Mitsunori Taguchi, Kazuhiro Kanai, Yuichi Sakai, Mitsushi Kitagawa, Yoshichika Sato, Takatoshi Shoji, Motofumi Ikeda
  • Publication number: 20070103395
    Abstract: A plasma display device in which a sustain pulse having a leading period is applied between row electrodes forming each row electrode pair by a number of times previously determined for each subfield, in a sustain period, and a length of the leading period of the sustain pulse is set in accordance with an accumulated light emission time or an accumulated use time of the plasma display panel.
    Type: Application
    Filed: November 3, 2006
    Publication date: May 10, 2007
    Inventors: Masatsugu Onizuka, Motofumi Ikeda, Yoshichika Sato, Tsutomu Tokunaga
  • Publication number: 20070057871
    Abstract: A plasma display device which changes, in accordance with an average luminance level of a video signal, the length of a pause period between a sustain pulse application end point at which one sustain pulse is applied in a sustain period of each of subfields and a sustain pulse application starting point at which the next sustain pulse is applied.
    Type: Application
    Filed: September 6, 2006
    Publication date: March 15, 2007
    Inventors: Yoshichika Sato, Motofumi Ikeda, Masatsugu Onizuka
  • Publication number: 20070052630
    Abstract: A plasma display device in which at least one of a first sustain pulse having a first leading period and a second sustain pulse having a second leading period shorter than the first leading period is applied between row electrodes forming each row electrode pair by a number of times previously determined for each subfield, in a sustain period, and an application ratio between the first sustain pulse and the second sustain pulse in the sustain period of each subfield is changed in accordance with a luminance level of a video signal.
    Type: Application
    Filed: September 8, 2006
    Publication date: March 8, 2007
    Inventors: Yoshichika Sato, Tsutomu Tokunaga, Motofumi Ikeda, Masatsugu Onizuka
  • Publication number: 20060290601
    Abstract: A plasma display device which selectively generates address discharge in each display cell in accordance with pixel data based on a video signal in an address period, applies a sustain pulse between row electrodes forming each row electrode pair in a sustain period, and applies a wall-charge adjusting pulse between row electrodes forming each of said row electrode pairs in a period from an end of the address period to a beginning of the sustain period.
    Type: Application
    Filed: May 31, 2006
    Publication date: December 28, 2006
    Inventors: Motofumi Ikeda, Yoshichika Sato
  • Publication number: 20060290602
    Abstract: A plasma display device which selectively generates address discharge in each display cell in accordance with pixel data based on a video signal in an address period, applies a sustain pulse between row electrodes forming each row electrode pair in a sustain period, and applies, in the sustain period, a discharge timing control pulse to one row electrode of each row electrode pair, so that the discharge timing control pulse partly overlaps with a first sustain pulse in terms of time, which is applied to the other row electrode of each row electrode pair.
    Type: Application
    Filed: June 7, 2006
    Publication date: December 28, 2006
    Inventors: Motofumi Ikeda, Yoshichika Sato, Nobuhiko Saegusa, Shigeru Iwaoka
  • Publication number: 20060279484
    Abstract: A plasma display device is provided which can stabilize discharge and improve display quality. In the plasma display device, a rear edge part of a sustain pulse to be applied at the end of a sustain period of each of the subfields is formed of a first section in which a voltage value slowly changes from a peak voltage value of the sustain pulse to a predetermined first voltage value, a second section in which the first voltage value is maintained for a predetermined period, and a third section in which the voltage value slowly changes from the first voltage value to a second voltage value having polarity different from that of the first voltage value.
    Type: Application
    Filed: April 25, 2006
    Publication date: December 14, 2006
    Inventors: Motofumi Ikeda, Kazuaki Sakata, Masatsugu Onizuka
  • Publication number: 20060267878
    Abstract: A plasma display device which allows to make longer a leading period of each sustain pulse belonging to a first group including at least a sustain pulse to be applied secondly in a sustain period of each subfield as compared to a leading period of each sustain pulse belonging to another group including at least one sustain pulse to be applied thirdly or later.
    Type: Application
    Filed: May 26, 2006
    Publication date: November 30, 2006
    Inventors: Motofumi Ikeda, Kazuaki Sakata
  • Publication number: 20060158129
    Abstract: A plasma display which can reduce the cost of a heat dissipating structure for a driver IC. A magnesium oxide layer is formed on a surface in contact with a discharge space in each of display cells of a PDP. The magnesium oxide film includes magnesium oxide crystals which are excited by electron beams irradiated thereto to emit cathode luminescence light having a peak in a wavelength range of 200 to 300 nm. Further, a pixel data pulse generator circuit for applying column electrodes with pixel data pulses in accordance with pixel data is divided into and built in a plurality of IC chips. Each of these IC chips is mounted on one of a plurality of flexible wiring boards which are connected to the power supply line and column electrodes, respectively.
    Type: Application
    Filed: December 15, 2005
    Publication date: July 20, 2006
    Inventors: Mitsushi Kitagawa, Kazuaki Sakata, Motofumi Ikeda