Patents by Inventor Ken Kumakura

Ken Kumakura 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: 8704735
    Abstract: A display method of a plasma display apparatus to which primary color video signals are inputted and which carries out color display by letting phosphors for primary colors emit light is provided. The display method displays the primary color video signals by changing a gray level of an output primary color video signal in accordance with a gray level of an input primary color video signal. When each gray level of the inputted primary color video signals changes from a first value to a second value which is larger than the first value, a gray level of a primary color video signal for a phosphor having the largest influence of luminance saturation properties among the phosphors is increased relative to a gray level of the other primary color video signal.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: April 22, 2014
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Patent number: 8405577
    Abstract: A display method of a plasma display apparatus to which primary color video signals are inputted and which carries out color display by letting phosphors for primary colors emit light is provided. The display method displays the primary color video signals by changing a gray level of an output primary color video signal in accordance with a gray level of an input primary color video signal. When each gray level of the inputted primary color video signals changes from a first value to a second value which is larger than the first value, a gray level of a primary color video signal for a phosphor having the largest influence of luminance saturation properties among the phosphors is increased relative to a gray level of the other primary color video signal.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: March 26, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Publication number: 20130010011
    Abstract: A display method of a plasma display apparatus to which primary color video signals are inputted and which carries out color display by letting phosphors for primary colors emit light is provided. The display method displays the primary color video signals by changing a gray level of an output primary color video signal in accordance with a gray level of an input primary color video signal. When each gray level of the inputted primary color video signals changes from a first value to a second value which is larger than the first value, a gray level of a primary color video signal for a phosphor having the largest influence of luminance saturation properties among the phosphors is increased relative to a gray level of the other primary color video signal.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 10, 2013
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Patent number: 8223174
    Abstract: A display apparatus, which displays a color image by controlling the number of emissions or the intensity thereof in accordance with primary color video signals input thereto, has a detection portion and a white balance correction portion. The detection portion is used to detect the number of emissions or the intensity, and the white balance correction portion is used to correct white balance by adjusting the amplitudes of the primary color video signals in accordance with the detected number of emissions or the detected intensity. Therefore, correct white balance can be maintained regardless of the number of emissions or the intensity of emission.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: July 17, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Publication number: 20110316895
    Abstract: A display method of a plasma display apparatus to which primary color video signals are inputted and which carries out color display by letting phosphors for primary colors emit light is provided. The display method displays the primary color video signals by changing a gray level of an output primary color video signal in accordance with a gray level of an input primary color video signal. When each gray level of the inputted primary color video signals changes from a first value to a second value which is larger than the first value, a gray level of a primary color video signal for a phosphor having the largest influence of luminance saturation properties among the phosphors is increased relative to a gray level of the other primary color video signal.
    Type: Application
    Filed: September 2, 2011
    Publication date: December 29, 2011
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Patent number: 8035578
    Abstract: A display apparatus, which displays a color image by controlling the number of emissions or the intensity thereof in accordance with primary color video signals input thereto, has a detection portion and a white balance correction portion. The detection portion is used to detect the number of emissions or the intensity, and the white balance correction portion is used to correct white balance by adjusting the amplitudes of the primary color video signals in accordance with the detected number of emissions or the detected intensity. Therefore, correct white balance can be maintained regardless of the number of emissions or the intensity of emission.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: October 11, 2011
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Publication number: 20090231320
    Abstract: A plasma display device which stops power supply or drive of a device by detecting an abnormality. The plasma display device is provided with a panel section (11) which has an address electrode (14) and performs display based on inputted display data, and a circuit section having an address drive circuit (17).
    Type: Application
    Filed: July 6, 2005
    Publication date: September 17, 2009
    Inventors: Ken Kumakura, Yoshikazu Kanazawa
  • Publication number: 20090040148
    Abstract: A display apparatus, which displays a color image by controlling the number of emissions or the intensity thereof in accordance with primary color video signals input thereto, has a detection portion and a white balance correction portion. The detection portion is used to detect the number of emissions or the intensity, and the white balance correction portion is used to correct white balance by adjusting the amplitudes of the primary color video signals in accordance with the detected number of emissions or the detected intensity. Therefore, correct white balance can be maintained regardless of the number of emissions or the intensity of emission.
    Type: Application
    Filed: September 22, 2008
    Publication date: February 12, 2009
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Patent number: 7439941
    Abstract: A display apparatus, which displays a color image by controlling the number of emissions or the intensity thereof in accordance with primary color video signals input thereto, has a detection portion and a white balance correction portion. The detection portion is used to detect the number of emissions or the intensity, and the white balance correction portion is used to correct white balance by adjusting the amplitudes of the primary color video signals in accordance with the detected number of emissions or the detected intensity. Therefore, correct white balance can be maintained regardless of the number of emissions or the intensity of emission.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: October 21, 2008
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Publication number: 20080136744
    Abstract: A plasma display device includes a PDP module having a plasma display panel (PDP), a drive circuit applying positive and negative sustain pulses having the same absolute value to the PDP, and a voltage detection circuit detecting voltage from the power supply module, and a power supply module having voltage output terminals connected to voltage input terminals of the PDP module through connection means, generating a positive voltage required to produce positive sustain pulses and a negative voltage required to produce negative sustain pulses from an AC supply voltage, both pulses being supplied to the PDP module, outputting both voltages from the voltage output terminals, and performing a feedback control for the output voltage based on a detection result from the voltage detection circuit, thereby effectively generating the positive and negative voltages required to produce the positive and negative sustain pulses without complex circuit configuration.
    Type: Application
    Filed: August 30, 2007
    Publication date: June 12, 2008
    Inventors: Shigetoshi Tomio, Ken Kumakura, Masashi Yamazaki
  • Publication number: 20080068405
    Abstract: A display apparatus, which displays a color image by controlling the number of emissions or the intensity thereof in accordance with primary color video signals input thereto, has a detection portion and a white balance correction portion. The detection portion is used to detect the number of emissions or the intensity, and the white balance correction portion is used to correct white balance by adjusting the amplitudes of the primary color video signals in accordance with the detected number of emissions or the detected intensity. Therefore, correct white balance can be maintained regardless of the number of emissions or the intensity of emission.
    Type: Application
    Filed: October 31, 2007
    Publication date: March 20, 2008
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Ken Kumakura, Hideaki Ohki, Yuichiro Kimura, Yasuji Noguchi, Takayuki Ooe
  • Publication number: 20070285353
    Abstract: A plasma display apparatus includes an IC that operates with a power supply voltage, of which a difference between a ground potential and a power supply potential is substantially more than 50 V, a ceramic condenser disposed in a vicinity of the IC and coupled between the ground potential and the power supply potential of the IC, and a resistor connected in series with the ceramic condenser between the ground potential and the power supply potential.
    Type: Application
    Filed: February 8, 2007
    Publication date: December 13, 2007
    Inventors: Yasuhito Igari, Yoshikazu Kanazawa, Shigetoshi Tomio, Ken Kumakura, Taizo Ohno, Hiroshi Ohtaka
  • Patent number: 7173581
    Abstract: An ALIS system PDP apparatus in which a reduction in the variation in luminance due to ringing has been reduced is disclosed. In an ALIS system PDP apparatus, X (first) electrodes and Y (second) electrodes are arranged in such a way that the X electrodes and the Y electrodes, whose path length, which is the length of each of the signal paths of a sustain discharge pulse from the X and Y electrode to sustain drive circuits, is longer or shorter than that of the peripheral X and Y electrodes, do not exist densely. Specifically, the order of arrangement of the odd and even X sustain drive circuits is reversed to that of odd and even Y sustain drive circuits.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: February 6, 2007
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Ken Kumakura, Yoshikazu Kanazawa, Hideaki Ohki, Takashi Fujisaki, Atsushi Yokoyama
  • Patent number: 6940559
    Abstract: The color reproduction correction circuit which corrects the color distortion caused when color signals using the first combination of the three primary colors are reproduced in a color display of the second combination of the different primary color sources has been disclosed, wherein: a provided color correction circuit generates the mixed color signal by multiplying the color signal in question by the specified coefficients and adding the mixed color signal to other color signals; the mixed colors in the second combination are used as primary color light sources in the second combination; the specified coefficients are determined so that these mixed color light sources are made close to the coordinates of the primary color light sources of the first combination; and the luminescent chromaticity values of the three primary colors are corrected so that the chromaticity values of the device match those specified by the signal system.
    Type: Grant
    Filed: June 4, 2004
    Date of Patent: September 6, 2005
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Ken Kumakura, Kazuyoshi Yamada, Hideaki Ohki, Hiroshi Ohtaka, Toshio Ueda
  • Publication number: 20040239590
    Abstract: An ALIS system PDP apparatus in which a reduction in the variation in luminance due to ringing has been reduced is disclosed. In an ALIS system PDP apparatus, X (first) electrodes and Y (second) electrodes are arranged in such a way that the X electrodes and the Y electrodes, whose path length, which is the length of each of the signal paths of a sustain discharge pulse from the X and Y electrode to sustain drive circuits, is longer or shorter than that of the peripheral X and Y electrodes, do not exist densely. Specifically, the order of arrangement of the odd and even X sustain drive circuits is reversed to that of odd and even Y sustain drive circuits.
    Type: Application
    Filed: March 10, 2004
    Publication date: December 2, 2004
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Ken Kumakura, Yoshikazu Kanazawa, Hideaki Ohki, Takashi Fujisaki, Atsushi Yokoyama
  • Publication number: 20040218101
    Abstract: The color reproduction correction circuit which corrects the color distortion caused when color signals using the first combination of the three primary colors are reproduced in a color display of the second combination of the different primary color sources has been disclosed, wherein: a provided color correction circuit generates the mixed color signal by multiplying the color signal in question by the specified coefficients and adding the mixed color signal to other color signals; the mixed colors in the second combination are used as primary color light sources in the second combination; the specified coefficients are determined so that these mixed color light sources are made close to the coordinates of the primary color light sources of the first combination; and the luminescent chromaticity values of the three primary colors are corrected so that the chromaticity values of the device match those specified by the signal system.
    Type: Application
    Filed: June 4, 2004
    Publication date: November 4, 2004
    Applicant: Fujitsu Hitachi Plasma Display Limited
    Inventors: Ken Kumakura, Kazuyoshi Yamada, Hideaki Ohki, Hiroshi Ohtaka, Toshio Ueda
  • Patent number: 6781322
    Abstract: A capacitive load circuit and a plasma display apparatus using such a circuit, being able to use a sustain transistor having a voltage rating in accordance with a sustain voltage even when a voltage larger than the sustain voltage is applied to a sustain electrode, have been disclosed, wherein a switch whose one end is connected to a capacitive load is comprised and when a third voltage, whose voltage difference from a second voltage is larger than the voltage difference between a first voltage and the second voltage, is applied to the capacitive load, a fourth voltage is selectively applied to the other end of the switch.
    Type: Grant
    Filed: January 22, 2003
    Date of Patent: August 24, 2004
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Makoto Onozawa, Eiji Ito, Ken Kumakura, Hideaki Ohki, Masaki Kamada, Kazuyoshi Yamada
  • Patent number: 6753930
    Abstract: The color reproduction correction circuit which corrects the color distortion caused when color signals using the first combination of the three primary colors are reproduced in a color display of the second combination of the different primary color sources has been disclosed, wherein: a provided color correction circuit generates the mixed color signal by multiplying the color signal in question by the specified coefficients and adding the mixed color signal to other color signals; the mixed colors in the second combination are used as primary color light sources in the second combination; the specified coefficients are determined so that these mixed color light sources are made close to the coordinates of the primary color light sources of the first combination; and the luminescent chromaticity values of the three primary colors are corrected so that the chromaticity values of the device match those specified by the signal system.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: June 22, 2004
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Ken Kumakura, Kazuyoshi Yamada, Hideaki Ohki, Hiroshi Ohtaka, Toshio Ueda
  • Publication number: 20030214244
    Abstract: A capacitive load circuit and a plasma display apparatus using such a circuit, being able to use a sustain transistor having a voltage rating in accordance with a sustain voltage even when a voltage larger than the sustain voltage is applied to a sustain electrode, have been disclosed, wherein a switch whose one end is connected to a capacitive load is comprised and when a third voltage, whose voltage difference from a second voltage is larger than the voltage difference between a first voltage and the second voltage, is applied to the capacitive load, a fourth voltage is selectively applied to the other end of the switch.
    Type: Application
    Filed: January 22, 2003
    Publication date: November 20, 2003
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Makoto Onozawa, Eiji Ito, Ken Kumakura, Hideaki Ohki, Masaki Kamada, Kazuyoshi Yamada
  • Publication number: 20020012073
    Abstract: The color reproduction correction circuit which corrects the color distortion caused when color signals using the first combination of the three primary colors are reproduced in a color display of the second combination of the different primary color sources has been disclosed, wherein: a provided color correction circuit generates the mixed color signal by multiplying the color signal in question by the specified coefficients and adding the mixed color signal to other color signals; the mixed colors in the second combination are used as primary color light sources in the second combination; the specified coefficients are determined so that these mixed color light sources are made close to the coordinates of the primary color light sources of the first combination; and the luminescent chromaticity values of the three primary colors are corrected so that the chromaticity values of the device match those specified by the signal system.
    Type: Application
    Filed: June 12, 2001
    Publication date: January 31, 2002
    Applicant: FUJITSU HITACHI PLASMA DISPLAY LIMITED
    Inventors: Ken Kumakura, Kazuyoshi Yamada, Hideaki Ohki, Hiroshi Ohtaka, Toshio Ueda