Patents by Inventor Nobuhiko Saegusa
Nobuhiko Saegusa 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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Patent number: 9215766Abstract: A drive device for a light-emitting element that improves accuracy while driving the light-emitting element at small currents for which a comparatively simple configuration is provided. The drive device includes detecting means, comparing means, a driving voltage source, and offset means. The detecting means detects a voltage corresponding to a current flowing through a first resistor for current detection. The first resistor is coupled to a light-emitting element in series. The comparing means compares a magnitude of the detection voltage of the detecting unit with a comparison voltage. The driving voltage source applies a voltage corresponding to a comparison result by the comparing means to a series circuit of the light-emitting element and the first resistor. The offset means corrects the voltage corresponding to a current flowing through the first resistor by a correction voltage.Type: GrantFiled: February 1, 2011Date of Patent: December 15, 2015Assignees: Pioneer Corporation, Tohoku Pioneer CorporationInventors: Hideo Ochi, Nobuhiko Saegusa, Katsuhiro Kanauchi
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Publication number: 20130320884Abstract: A drive device for a light-emitting element that improves accuracy while driving the light-emitting element at small currents for which a comparatively simple configuration is provided. The drive device includes detecting means, comparing means, a driving voltage source, and offset means. The detecting means detects a voltage corresponding to a current flowing through a first resistor for current detection. The first resistor is coupled to a light-emitting element in series. The comparing means compares a magnitude of the detection voltage of the detecting unit with a comparison voltage. The driving voltage source applies a voltage corresponding to a comparison result by the comparing means to a series circuit of the light-emitting element and the first resistor. The offset means corrects the voltage corresponding to a current flowing through the first resistor by a correction voltage.Type: ApplicationFiled: February 1, 2011Publication date: December 5, 2013Applicants: TOHOKU PIONEER CORPORATION, Pioneer CorporationInventors: Hideo Ochi, Nobuhiko Saegusa, Katsuhiro Kanauchi
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Patent number: 7777695Abstract: 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: GrantFiled: June 7, 2006Date of Patent: August 17, 2010Assignee: Panasonic CorportionInventors: Motofumi Ikeda, Yoshichika Sato, Nobuhiko Saegusa, Shigeru Iwaoka
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Patent number: 7688287Abstract: A plasma display apparatus includes a plasma display panel. Pulse voltage values and/or pulse widths of a variety of drive pulses that are applied to the plasma display panel are adjusted in accordance with the accumulated usage time of the plasma display panel.Type: GrantFiled: September 23, 2005Date of Patent: March 30, 2010Assignee: Panasonic CorporationInventors: Tsutomu Tokunaga, Yoshichika Sato, Nobuhiko Saegusa
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Patent number: 7333076Abstract: A method for driving a display panel with which the dark contrast can be improved is provided. Each of at least two successive sub-fields including a leading sub-field includes a selective write addressing step for setting the discharge cells to a lighted discharge cell mode by selectively causing a writing discharge in the discharge cells in accordance with the video signal. The sub-fields following at least two sub-fields include a selective erasure addressing step for setting the discharge cells to an unlighted discharge cell mode by selectively causing an erasing discharge in the discharge cells in accordance with the video signal and an emission sustain step for repeatedly causing a sustain discharge corresponding to a weighting of that sub-field only in the discharge cells that are in the lighted discharge cell mode.Type: GrantFiled: September 11, 2003Date of Patent: February 19, 2008Assignees: Pioneer Corporation, Pioneer Display Products CorporationInventors: Hideto Nakamura, Mitsunori Taguchi, Tsutomu Tokunaga, Shigeru Iwaoka, Nobuhiko Saegusa
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Publication number: 20060290602Abstract: 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: ApplicationFiled: June 7, 2006Publication date: December 28, 2006Inventors: Motofumi Ikeda, Yoshichika Sato, Nobuhiko Saegusa, Shigeru Iwaoka
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Patent number: 7136034Abstract: A display panel includes a plurality of unit light emission areas (light emission elements) arranged in a matrix. Each unit light emission area is defined by a first discharge cell and a second discharge cell. The second discharge cell has a light-absorbing layer. When the display panel is driven to express an image having a plurality of gradation levels, address discharge is selectively caused in the second discharge cells in accordance with an input image signal. Light leaks to the first discharge cell from the second discharge cell upon the address discharge. This light is used to express the gradation of low luminance. Since luminance difference between gradation levels of a low luminance image is reduced, it is possible to display a high quality, low luminance image.Type: GrantFiled: October 6, 2003Date of Patent: November 14, 2006Assignees: Pioneer Corporation, Pioneer Display Products CorporationInventors: Tsutomu Tokunaga, Nobuhiko Saegusa, Kazuo Yahagi, Mitsushi Kitagawa, Shigeru Iwaoka
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Publication number: 20060232613Abstract: In an apparatus for processing video signals to control a display device that displays a video, a display video signal is generated for each of the colors from received video signals; a delayed display video signal is generated for each display video signal by delaying the display video signal by one field; an afterglow level of at least a first color among the colors is calculated based on the delayed display video signals; a correction signal is generated based on the afterglow level; a display video signal for the first color is selected as the display video signal of the first color when a level of the display video signal of the first color is equal to or higher than the correction signal, and the correction signal is selected when a level of the display video signal of the first color is lower than the correction signal.Type: ApplicationFiled: March 30, 2006Publication date: October 19, 2006Inventors: Atsushi Matsuno, Nobuhiko Saegusa, Tetsuya Shigeta, Hiroshi Ando, Hirofumi Honda
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Patent number: 7091668Abstract: A display and a driving method of a display panel capable of improving a dark contrast.Type: GrantFiled: October 3, 2003Date of Patent: August 15, 2006Assignees: Pioneer Corporation, Pioneer Display Products CorporationInventors: Kazuo Yahagi, Mitsushi Kitagawa, Nobuhiko Saegusa, Shigeru Iwaoka, Tsutomu Tokunaga, Ryo Suzue
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Patent number: 7075504Abstract: A plasma display panel capable of improving dark contrast. A unit light emission region is comprised of a display discharge cell in which a discharge is produced between portions of row electrodes X, Y of each row electrode pair (X, Y) opposing each other, and a reset and address discharge cell arranged in parallel with the display discharge cell, in which a discharge is produced between portions of the row electrode Y and a row electrode X of another adjacent row electrode pair (X, Y). The display discharge cell and reset and address discharge cell are communicated with each other. A light absorbing layer is formed in a portion of the reset and address discharge cell opposing the display surface. According to another aspect, the unit light emission region in the display panel comprises a first discharge cell and a second discharge cell comprising a light absorbing layer.Type: GrantFiled: September 13, 2002Date of Patent: July 11, 2006Assignees: Pioneer Corporation, Pioneer Display Products CorporationInventors: Tsutomu Tokunaga, Nobuhiko Saegusa, Kazuo Yahagi, Mitsushi Kitagawa, Ryo Suzue, Eishiro Otani, Yoichi Sato
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Patent number: 7042424Abstract: The object of the invention is to provide a method for driving a plasma display panel that provides an improved expression of levels of halftone as well as an improved display quality. In N sub-fields constituting a display period of one field, when a pixel data writing step for setting discharge cells to either one of non-light-emitting cells or light-emitting cells in response to pixel data and a light-emission sustaining step for allowing only the aforementioned light-emitting cells to emit light only during a light-emission period corresponding to weights assigned to the sub-fields respectively are executed, the light-emission period in the light-emission sustaining step of the respective sub-fields is changed field by field or frame by frame. According to another aspect, the invention allows for carrying out selectively a first drive pattern or a second drive pattern.Type: GrantFiled: July 24, 2003Date of Patent: May 9, 2006Assignee: Pioneer CorporationInventors: Tetsuya Shigeta, Hitoshi Mochizuki, Masahiro Suzuki, Nobuhiko Saegusa
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Publication number: 20060066519Abstract: A plasma display apparatus includes a plasma display panel. Pulse voltage values and/or pulse widths of a variety of drive pulses that are applied to the plasma display panel are adjusted in accordance with the accumulated usage time of the plasma display panel.Type: ApplicationFiled: September 23, 2005Publication date: March 30, 2006Inventors: Tsutomu Tokunaga, Yoshichika Sato, Nobuhiko Saegusa
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Patent number: 6967636Abstract: The object of the invention is to provide a method for driving a plasma display panel that provides an improved expression of levels of halftone as well as an improved display quality. In N sub-fields constituting a display period of one field, when a pixel data writing step for setting discharge cells to either one of non-light-emitting cells or light-emitting cells in response to pixel data and a light-emission sustaining step for allowing only the aforementioned light-emitting cells to emit light only during a light-emission period corresponding to weights assigned to the sub-fields respectively are executed, the light-emission period in the light-emission sustaining step of the respective sub-fields is changed field by field or frame by frame. According to another aspect, the invention allows for carrying out selectively a first drive pattern or a second drive pattern.Type: GrantFiled: July 24, 2003Date of Patent: November 22, 2005Assignee: Pioneer CorporationInventors: Tetsuya Shigeta, Hitoshi Mochizuki, Masahiro Suzuki, Nobuhiko Saegusa
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Publication number: 20050088370Abstract: The object of the invention is to provide a method for driving a plasma display panel that provides an improved expression of levels of halftone as well as an improved display quality. In N sub-fields constituting a display period of one field, when a pixel data writing step for setting discharge cells to either one of non-light-emitting cells or light-emitting cells in response to pixel data and a light-emission sustaining step for allowing only the aforementioned light-emitting cells to emit light only during a light-emission period corresponding to weights assigned to the sub-fields respectively are executed, the light-emission period in the light-emission sustaining step of the respective sub-fields is changed field by field or frame by frame. According to another aspect, the invention allows for carrying out selectively a first drive pattern or a second drive pattern.Type: ApplicationFiled: July 24, 2003Publication date: April 28, 2005Inventors: Tetsuya Shigeta, Hitoshi Mochizuki, Masahiro Suzuki, Nobuhiko Saegusa
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Publication number: 20050078060Abstract: The object of the invention is to provide a method for driving a plasma display panel that provides an improved expression of levels of halftone as well as an improved display quality. In N sub-fields constituting a display period of one field, when a pixel data writing step for setting discharge cells to either one of non-light-emitting cells or light-emitting cells in response to pixel data and a light-emission sustaining step for allowing only the aforementioned light-emitting cells to emit light only during a light-emission period corresponding to weights assigned to the sub-fields respectively are executed, the light-emission period in the light-emission sustaining step of the respective sub-fields is changed field by field or frame by frame. According to another aspect, the invention allows for carrying out selectively a first drive pattern or a second drive pattern.Type: ApplicationFiled: July 24, 2003Publication date: April 14, 2005Inventors: Tetsuya Shigeta, Hitoshi Mochizuki, Masahiro Suzuki, Nobuhiko Saegusa
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Publication number: 20050073479Abstract: A display apparatus which sequentially applies a scanning pulse to one row electrode of the row electrode pair while applying a pixel data pulse corresponding to the pixel data to the column electrodes one display line by one display line, simultaneously with the scanning pulse, to selectively produce an address discharge in the second discharge cell in the address period, applies a sustain pulse to the row electrode pairs in the sustain period, and produces a reset discharge in the same discharge current direction as the address discharge between one row electrode of the row electrode pair and the column electrode in the second discharge cell immediately before the address period of at least the first sub-field of the one-field display period, and a method of driving the display panel.Type: ApplicationFiled: September 30, 2004Publication date: April 7, 2005Inventors: Hikaru Takahashi, Hideto Endo, Keishi Saito, Kazuo Yahagi, Yuya Shiozaki, Yuichi Sakai, Shigeru Iwaoka, Nobuhiko Saegusa
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Patent number: 6873106Abstract: A plasma display panel includes: a plurality of row electrode pairs (X, Y) provided on a front glass substrate (10); a protective layer (12) on the front glass substrate (10); and a plurality of column electrodes (D) provided in a back substrate (13) at intersections with the row electrode pairs (X, Y) to form discharge cells (C) in the discharge space (S). An ultraviolet region light emissive layer (17) having persistence characteristics allowing continuous emission of ultraviolet light as a result of excitation by ultraviolet rays having 0.1 msec or more of a wavelength is provided at a site facing each discharge cell (C) between the front glass substrate (10) and the back glass substrate (13).Type: GrantFiled: May 23, 2001Date of Patent: March 29, 2005Assignees: Pioneer Corporation, Shizuoka Pioneer CorporationInventors: Kimio Amemiya, Nobuhiko Saegusa, Chiharu Koshio, Hitoshi Taniguchi
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Patent number: 6831618Abstract: A method for driving a display panel which enables changing of the refresh rate, without degrading display quality, of a display panel employing the matrix display scheme for carrying out gray-scale drive by using the sub-field method. By the method, the number of sub-fields to be executed within a unit display period is changed in response to the vertical synchronization frequency of an input video signal.Type: GrantFiled: March 3, 2000Date of Patent: December 14, 2004Assignee: Pioneer CorporationInventors: Masahiro Suzuki, Nobuhiko Saegusa
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Publication number: 20040104868Abstract: A display device capable of preventing erroneous discharge and improving the quality of display. The display panel has a unit light-emitting area formed at the intersection of row and column electrodes which is structured by a first discharge cell and a second discharge cell having a light absorbing layer at a side close to a front substrate and a secondary-electron emitting material layer at a side close to a back substrate. While applying a scanning pulse having a polarity to place the column electrode in low potential to one row electrode of a row electrode pair, a pixel data pulse having a voltage commensurate with pixel data is applied to the column electrode, thereby selectively causing address discharge within the second discharge cell.Type: ApplicationFiled: November 6, 2003Publication date: June 3, 2004Applicant: PIONEER CORPORATIONInventors: Hiroyuki Ajiki, Nobuhiko Saegusa, Kimio Amemiya, Kazuo Yahagi, Mitsushi Kitagawa
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Publication number: 20040104685Abstract: A display and a driving method of a display panel capable of improving a dark contrast.Type: ApplicationFiled: October 3, 2003Publication date: June 3, 2004Applicants: PIONEER CORPORATION, PIONEER DISPLAY PRODUCTS CORPORATIONInventors: Kazuo Yahagi, Mitsushi Kitagawa, Nobuhiko Saegusa, Shigeru Iwaoka, Tsutomu Tokunaga, Ryo Suzue