Patents by Inventor Toshikazu Wakabayashi

Toshikazu Wakabayashi 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: 20060164338
    Abstract: Barrier ribs are disposed on a back substrate so as to separate main discharge cells and priming discharge cells, and the top parts of the barrier ribs are formed so as to abut on a front substrate. In a driving method, in an odd-numbered line writing time period, scan pulse Va is sequentially applied to odd-numbered scan electrode SCp and voltage Vq is applied to even-numbered sustain electrode SUp+1 to cause priming discharge between even-numbered sustain electrode SUp+1 and odd-numbered scan electrode SCp. In an even-numbered line writing time period, scan pulse Va is sequentially applied to even-numbered scan electrode SCp+1 and voltage Vq is applied to odd-numbered sustain electrode SUp to cause priming discharge between odd-numbered sustain electrode SUp and even-numbered scan electrode SCp+1.
    Type: Application
    Filed: February 23, 2005
    Publication date: July 27, 2006
    Inventors: Hiroyuki Tachibana, Jumpei Hashiguchi, Kenji Ogawa, Toshikazu Wakabayashi, Tomohiro Murakoso
  • Publication number: 20060145997
    Abstract: Barrier ribs are disposed on a back substrate so as to separate main discharge cells formed of a display electrode pair and a data electrode which face each other and priming discharge cells formed of a clearance between two adjacent scan electrodes. The top parts of the barrier ribs are formed so as to abut on a front substrate. In a driving method, in an odd-numbered line writing time period, scan pulse Va is sequentially applied to odd-numbered scan electrode SCp and voltage Vq is applied to even-numbered scan electrode SCp+1 to cause priming discharge between scan electrode SCp+1 and odd-numbered scan electrode SCp. In an even-numbered line writing time period, scan pulse Va is sequentially applied to even-numbered scan electrode SCp+1 and voltage Vq is applied to odd-numbered scan electrode SCp to cause priming discharge between scan electrode SCp and even-numbered scan electrode SCp+1.
    Type: Application
    Filed: January 13, 2005
    Publication date: July 6, 2006
    Inventors: Hiroyuki Tachibana, Jumpei Hashiguchi, Kenji Ogawa, Toshikazu Wakabayashi, Tomohiro Murakoso
  • Patent number: 7068245
    Abstract: A plasma display apparatus has a waveform of a driving voltage supplied from a driver. The waveform has a sustaining period when a sustaining pulse is alternately applied to scanning electrodes and sustain electrodes for keeping discharge. Besides, the waveform has an erasing period when a ramp voltage pulse whose polarity differs from that of a sustaining pulse is applied to an electrode, which differs from an electrode where a last pulse of the sustaining pulse is applied. As a result, false discharge is prevented, and a stable image can be displayed.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: June 27, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Nobuaki Nagao, Junpei Hashiguchi, Katsutoshi Shindo, Toshikazu Wakabayashi
  • Patent number: 6987495
    Abstract: In each of sub-fields on each of lines in a plasma display device, it is judged whether or not all of a plurality of discharge cells on the line or the display cells whose number is not less than a predetermined number do not emit light, and at least one of a voltage applied to a scan electrode and a voltage applied to a sustain electrode on the line are kept at predetermined levels when all of the discharge cells or the discharge cells whose number is not less than the predetermined number do not emit light, or a pulse having the same phase as that of a sustain pulse applied to the sustain electrode 13 is periodically applied in place of a sustain pulse applied to the scan electrode 12 corresponding to the line, to decrease a charge or discharge current as well as to reduce the generation of electromagnetic waves.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: January 17, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshikazu Wakabayashi, Masanori Nakatsuji, Jumpei Hashiguchi, Kazuo Oohira
  • Publication number: 20050219156
    Abstract: The initializing period of at least one of a plurality of sub-fields constituting one field is a selective initializing period for selectively initializing discharge cells in which sustain discharge has occurred in the sustaining period of the preceding sub-field. In the sustaining period of the sub-field prior to the sub-field including the selective initializing period, voltage Vr is applied to a priming electrode (PRi) for causing discharge between the priming electrode (PRi) and corresponding scan electrode (SCi) using the priming electrode (PRi) as a cathode.
    Type: Application
    Filed: March 23, 2004
    Publication date: October 6, 2005
    Inventors: Hiroyuki Tachibana, Naoki Kosugi, Toshikazu Wakabayashi, Yasuaki Muto
  • Publication number: 20050219160
    Abstract: Front substrate (1) contains a plurality of scan electrodes (6) and sustain electrodes (7). Two strips of scan electrodes (6) and two strips of sustain electrodes (7) are alternately disposed on the substrate. In addition, a plurality of auxiliary scan electrodes (20) is disposed on front substrate (1) so as to be parallel to scan electrodes (6). On back substrate (2), a plurality of priming electrodes (14) is disposed parallel to scan electrodes (6). Each auxiliary scan electrode (20) has electrical connections to the scan electrode that performs scanning earlier than the scan electrode adjacent to each auxiliary scan electrode (20). With the structure above, a priming discharge occurs between auxiliary scan electrodes (20) and priming electrodes (14).
    Type: Application
    Filed: March 23, 2004
    Publication date: October 6, 2005
    Inventors: Hiroyuki Tachibana, Naoki Kosugi, Toshikazu Wakabayashi
  • Publication number: 20050200570
    Abstract: A method of driving a plasma display panel including a plurality of priming electrodes. The pulse width of scan pulses applied to some of a plurality of scan electrodes in which writing is performed and priming discharge is caused with the scanning of the scan electrodes is larger than the pulse width of scan pulses applied to the other scan electrodes in which writing is performed but no priming discharge is caused with the scanning of the scan electrodes.
    Type: Application
    Filed: March 23, 2004
    Publication date: September 15, 2005
    Inventors: Hiroyuki Tachibana, Toshikazu Wakabayashi, Shigeo Kigo, Nobuaki Nagao, Kenji Ogawa
  • Publication number: 20040263433
    Abstract: A plasma display apparatus has a waveform of a driving voltage supplied from a driver. The waveform has a sustaining period when a sustaining pulse is alternately applied to scanning electrodes and sustain electrodes for keeping discharge. Besides, the waveform has an erasing period when a ramp voltage pulse whose polarity differs from that of a sustaining pulse is applied to an electrode, which differs from an electrode where a last pulse of the sustaining pulse is applied. As a result, false discharge is prevented, and a stable image can be displayed.
    Type: Application
    Filed: June 24, 2003
    Publication date: December 30, 2004
    Inventors: Nobuaki Nagao, Junpei Hashiguchi, Katsutoshi Shindo, Toshikazu Wakabayashi
  • Publication number: 20030193449
    Abstract: In each of sub-fields on each of lines in a plasma display device, it is judged whether or not all of a plurality of discharge cells on the line or the display cells whose number is not less than a predetermined number do not emit light, and at least one of a voltage applied to a scan electrode and a voltage applied to a sustain electrode on the line are kept at predetermined levels when all of the discharge cells or the discharge cells whose number is not less than the predetermined number do not emit light, or a pulse having the same phase as that of a sustain pulse applied to the sustain electrode 13 is periodically applied in place of a sustain pulse applied to the scan electrode 12 corresponding to the line, to decrease a charge or discharge current as well as to reduce the generation of electromagnetic waves.
    Type: Application
    Filed: November 27, 2002
    Publication date: October 16, 2003
    Applicant: Matsushita Electric Industrial Co., LTD.
    Inventors: Toshikazu Wakabayashi, Masanori Nakatsuji, Jumpei Hashiguchi, Kazuo Oohira
  • Patent number: 5230019
    Abstract: A key signal conversion device for use in a CATV television system in which more than one different scrambling process is performed, the conversion device receiving one of a scrambled high-frequency signal in a television system and a sound intermediate frequency signal in the television system, extracting a key signal for unscrambling the scrambling in the television system and adding the key signal to a nonscrambled television signal which is to be subsequently scrambled by a process other than a process used to scramble the received signal, the key signal conversion device including: a first detecting circuit, for receiving the one of a scrambled television signal and a sound intermediate frequency signal, and for detecting one of a synchronizing signal of the television signal and a synchronizing signal superimposed on the sound intermediate frequency signal; a gate circuit, for receiving the one of a scrambled television signal and a sound intermediate-frequency signal, and for extracting the key signal
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: July 20, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toyokazu Yanagimichi, Harumasa Kajita, Tetsuo Kariya, Toshikazu Wakabayashi, Ichiro Kawashima, Satoshi Nakanami, Masami Tanaka
  • Patent number: 5199048
    Abstract: A noise canceler for use in a CATV converter includes a keying pulse processing circuit for removing a noise signal from a keying signal. The keying pulse processing circuit includes a canceling signal generator for generating a noise canceling pulse signal, a delaying circuit for delaying the keying signal to produce a delayed signal, and a logic circuit including an AND gate for producing a noise canceled signal which is obtained by taking a logical product of the canceling pulse signal and the delayed signal. Since the noise pulse has a sufficiently small width when compared with the pulse widths of the keying signal and noise removing signal, the noise pulse is removed to obtain a noise canceled signal.
    Type: Grant
    Filed: March 27, 1991
    Date of Patent: March 30, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Toshikazu Wakabayashi
  • Patent number: 5161187
    Abstract: A cable television system includes a transmitter and at least one receiver. In the transmitter, sync information is suppressed in amplitude to execute scrambling, and a sync width information signal and key data are superimposed on a television signal during a vertical blanking period. The sync width information signal has a burst form and a predetermined width, and represents whether sync information is present or absent. The key data represents contents of the scrambling. In the receiver, the sync width information signal is recovered, and a sync width information pulse corresponding to the sync width information signal is generated. A reference signal is generated on the basis of an edge of the sync width information pulse. The key data is extracted from the scrambled video information in response to the reference signal. Pseudo sync signals are generated in response to an edge of the sync width information pulse.
    Type: Grant
    Filed: March 7, 1991
    Date of Patent: November 3, 1992
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Harumasa Kajita, Toyokazu Yanagimichi, Tetsuo Kariya, Toshikazu Wakabayashi, Ichiro Kawashima, Satoshi Nakanami, Masami Tanaka