Patents by Inventor Kazuaki Sakata
Kazuaki Sakata 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).
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Publication number: 20140085242Abstract: Discharge for detecting the position coordinates of an electronic pen is caused stably, and the position coordinates are detected accurately. For this purpose, in a driving method of an image display device, an image display subfield, a y-coordinate detection subfield, and an x-coordinate detection subfield are set in one field. In the y-coordinate detection subfield, a y-coordinate detection voltage of positive voltage is applied to data electrodes and y-coordinate detection pulses of negative polarity are sequentially applied to the scan electrodes. In the x-coordinate detection subfield, an x-coordinate detection voltage of negative voltage is applied to scan electrodes and x-coordinate detection pulses of positive polarity are sequentially applied to data electrodes.Type: ApplicationFiled: August 6, 2012Publication date: March 27, 2014Applicant: PANASONIC CORPORATIONInventors: Takateru Sawada, Takahiko Origuchi, Yuya Shiozaki, Kazuaki Sakata
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Publication number: 20130113846Abstract: High image display quality is achieved when a 3D image is displayed on a plasma display panel (10). For this purpose, a driver circuit includes sustain pulse generation circuits (60) and (80), control signal generation circuit (45) for generating a shutter opening/closing timing signal and a control signal for controlling sustain pulse generation circuits (60) and (80), all-cell light-emitting rate detecting circuit (46) for detecting the all-cell light-emitting rate in each subfield, and partial light-emitting rate detecting circuit (47) for detecting the partial light-emitting rate in each of a plurality of regions set in an image display region of plasma display panel (10) in each subfield. The driver circuit corrects the number of sustain pulses to be generated set based on the image signal and luminance weight in each of the subfields in response to the all-cell light-emitting rate and the partial light-emitting rate.Type: ApplicationFiled: July 21, 2011Publication date: May 9, 2013Applicant: PANASONIC CORPORATIONInventors: Takahiko Origuchi, Kazuaki Sakata, Naoyuki Tomioka, Mitsuhiro Ishizuka
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Patent number: 7834820Abstract: 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: GrantFiled: May 26, 2006Date of Patent: November 16, 2010Assignee: Panasonic CorporationInventors: Motofumi Ikeda, Kazuaki Sakata
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Patent number: 7786957Abstract: A plasma display device which generates reset discharge in a reset period prior to an address period in the beginning subfields of a one-field display period, and applies two sustain pulses, which have rising timings different from each other by a predetermined period of time and have partly overlapping application periods, to row electrodes forming each row electrode pair after ending a sustain period in a last subfield of the one-field display period to thereby cause erasure discharge in discharge cells where sustain discharge has been caused in the last subfield.Type: GrantFiled: July 6, 2006Date of Patent: August 31, 2010Assignee: Panasonic CorporationInventor: Kazuaki Sakata
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Patent number: 7733305Abstract: There are provided a plasma display device in which dark contrast can be enhanced without deteriorating an image quality and a method of driving a plasma display panel. In a case of driving a plasma display device in which a magnesium oxide layer containing a magnesium oxide crystal to be excited by the irradiation of an electron beam and performing a cathode luminescence having a peak in a wavelength range of 200 to 300 nm by a sub-field method, in order to initialize all display cells, reset discharge is caused in each of the display cells in M sub-fields of N consecutive sub-fields (0<M<N).Type: GrantFiled: May 17, 2005Date of Patent: June 8, 2010Assignee: Panasonic CorporationInventors: Masaru Nishimura, Tsutomu Tokunaga, Kazuaki Sakata, Atsushi Hirota, Hai Lin
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Patent number: 7724213Abstract: 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: GrantFiled: April 25, 2006Date of Patent: May 25, 2010Assignee: Panasonic CorporationInventors: Motofumi Ikeda, Kazuaki Sakata, Masatsugu Onizuka
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Patent number: 7710353Abstract: A method of driving a display panel is provided which can reduce power consumption. During a unit display period, the number of times of second and subsequent selective erase operations performed on one display cell of each pixel is different from the number of times of second and subsequent selective erase operations performed on another display cell emitting light of different color from that of the one display cell.Type: GrantFiled: February 27, 2006Date of Patent: May 4, 2010Assignee: Panasonic CorporationInventors: Yoshichika Sato, Kazuaki Sakata, Shigeru Iwaoka, Kenichiro Hosoi, Takeharu Iwata
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Patent number: 7667670Abstract: 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: GrantFiled: December 15, 2005Date of Patent: February 23, 2010Assignee: Panasonic CorporationInventors: Mitsushi Kitagawa, Kazuaki Sakata, Motofumi Ikeda
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Patent number: 7633465Abstract: A plasma display apparatus and a driving method of a plasma display panel which can improve a gradation expressing ability at low luminance. A magnesium oxide layer containing a magnesium oxide crystal which is excited by irradiation of an electron beam and performs a cathode luminescence light emission having a peak in a wavelength range of 200 to 300 nanometers is provided in each of display cells formed on the plasma display panel. When driving for a plurality of subfields having different luminance weights is performed, a sustaining discharge is caused only once in the subfield having the minimum luminance weight.Type: GrantFiled: April 21, 2005Date of Patent: December 15, 2009Assignee: Panasonic CorporationInventors: Kazuaki Sakata, Masaru Nishimura, Atsushi Hirota, Tsutomu Tokunaga, Hai Lin
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Patent number: 7609232Abstract: A plasma display device in which in a sustain period for each subfield, a time point to clamp to a second potential a sustain pulse belonging to a first group including a sustain pulse to be first applied is delayed comparing to a time point to clamp to the second potential a sustain pulse belonging to other groups.Type: GrantFiled: November 17, 2005Date of Patent: October 27, 2009Assignee: Panasonic CorporationInventor: Kazuaki Sakata
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Patent number: 7522128Abstract: A plasma display device having a plasma display panel in which, each display cell contains a magnesium oxide layer including magnesium oxide crystals that are excited by an electron beam to emit cathode luminescence light having a peak in a wavelength range of 200 to 300 nm. In an addressing period, a row electrode driving circuit applies a scanning pulse to one row electrodes of row electrode pairs in turn, while a column electrode driving circuit supplies column electrodes with data pulses corresponding to one row electrode which is applied with the scanning pulse.Type: GrantFiled: May 24, 2005Date of Patent: April 21, 2009Assignee: Pioneer CorporationInventors: Tsutomu Tokunaga, Masaru Nishimura, Kazuaki Sakata, Atsushi Hirota, Hai Lin
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Patent number: 7463220Abstract: A plasma display device and a method of driving a plasma display panel are provided for improving the contrast without degrading the image quality. Each of display cells formed on the plasma display panel has a magnesium oxide layer containing magnesium oxide crystals. The magnesium oxide crystals are excited by an electron beam irradiated thereto and emit cathode luminescence light having a peak in a wavelength range of 200 to 300 nm. In order to trigger a rest discharge in all the display cells, each row electrode pair of the plasma display panel is applied with a reset pulse which has a particular pulse waveform. The voltage value of this reset pulse slowly changes over time to reach a peak voltage value.Type: GrantFiled: April 21, 2005Date of Patent: December 9, 2008Assignee: Pioneer CorporationInventors: Kazuaki Sakata, Masaru Nishimura, Atsushi Hirota, Tsutomu Tokunaga, Hai Lin
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Patent number: 7369104Abstract: An apparatus for driving a display panel can execute quality image display. To allow discharge cells operating as pixels of the display panel to repeatedly perform sustain discharge, a fall period of a last sustain pulse of sustain pulses repeatedly applied to row electrodes includes a first voltage drop period in which a voltage value gently drops, a voltage constant period which follows the first voltage drop period and in which the voltage value remains constant for a predetermined period, and a second voltage drop period which follows the voltage constant period and in which the voltage value drops more gently than in the first voltage drop period.Type: GrantFiled: July 19, 2004Date of Patent: May 6, 2008Assignee: Pioneer CorporationInventors: Kazuaki Sakata, Yoshichika Sato, Tsutomu Tokunaga, Hideki Tanaka, Hideto Nakamura
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Patent number: 7330167Abstract: In order to provide a method for driving a display panel capable of improving durability of a driving device for driving a display panel, when a scan pulse is applied in superposition with a base pulse to one of row electrodes of one row electrode pair among row electrode pairs while the base pulse is applied to one of the row electrodes of all the row electrode pairs in the display panel and a pixel data pulse corresponding to an image signal is applied to the row electrode at the same timing as that of the scan pulse to set discharge cells to either one of a light-on mode and a light-off mode, a change ratio of a voltage value in a fall period in the base pulse is smaller than a change ratio of a voltage value in a fall period in the scan pulse.Type: GrantFiled: July 19, 2004Date of Patent: February 12, 2008Assignee: Pioneer CorporationInventors: Kazuaki Sakata, Hideto Nakamura, Hideki Tanaka, Yoshichika Sato, Tsutomu Tokunaga, Mitsushi Kitagawa
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Publication number: 20070008244Abstract: A plasma display device which generates reset discharge in a reset period prior to an address period in the beginning subfields of a one-field display period, and applies two sustain pulses, which have rising timings different from each other by a predetermined period of time and have partly overlapping application periods, to row electrodes forming each row electrode pair after ending a sustain period in a last subfield of the one-field display period to thereby cause erasure discharge in discharge cells where sustain discharge has been caused in the last subfield.Type: ApplicationFiled: July 6, 2006Publication date: January 11, 2007Inventor: Kazuaki Sakata
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Publication number: 20060279484Abstract: 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: ApplicationFiled: April 25, 2006Publication date: December 14, 2006Inventors: Motofumi Ikeda, Kazuaki Sakata, Masatsugu Onizuka
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Publication number: 20060267878Abstract: 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: ApplicationFiled: May 26, 2006Publication date: November 30, 2006Inventors: Motofumi Ikeda, Kazuaki Sakata
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Publication number: 20060227072Abstract: A method of driving a display panel is provided which can reduce power consumption. During a unit display period, the number of times of second and subsequent selective erase operations performed on one display cell of each pixel is different from the number of times of second and subsequent selective erase operations performed on another display cell emitting light of different color from that of the one display cell.Type: ApplicationFiled: February 27, 2006Publication date: October 12, 2006Inventors: Yoshichika Sato, Kazuaki Sakata, Shigeru Iwaoka, Kenichiro Hosoi, Takeharu Iwata
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Publication number: 20060158129Abstract: 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: ApplicationFiled: December 15, 2005Publication date: July 20, 2006Inventors: Mitsushi Kitagawa, Kazuaki Sakata, Motofumi Ikeda
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Publication number: 20060109210Abstract: A plasma display device in which in a sustain period for each subfield, a time point to clamp to a second potential a sustain pulse belonging to a first group including a sustain pulse to be first applied is delayed comparing to a time point to clamp to the second potential a sustain pulse belonging to other groups.Type: ApplicationFiled: November 17, 2005Publication date: May 25, 2006Inventor: Kazuaki Sakata