Patents by Inventor Takeshi Izumida
Takeshi Izumida 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: 9208720Abstract: An organic EL displaying apparatus which suppresses a defective display caused by a leak current at a time when an emission period controlling transistor is off is provided. The organic EL displaying apparatus comprises a plurality of pixels each of which includes an organic EL element, a power supply line, a driving transistor and the emission period controlling transistor, a data line, and a control line. In this apparatus, in a certain one of the pixels, a resistance Roff—ILM between source and drain electrodes of the emission period controlling transistor in an off state of the emission period controlling transistor, and a resistance Rbk—Dr between source and drain electrodes of the driving transistor in a state that a minimum gradation displaying data voltage has been applied to a gate electrode of the driving transistor satisfy Roff—ILM?Rbk—Dr.Type: GrantFiled: November 15, 2011Date of Patent: December 8, 2015Assignees: Canon Kabushiki Kaisha, Hitachi Displays, Ltd.Inventors: Junya Tamaki, Nobuhiko Sato, Masami Iseki, Kouji Ikeda, Masahiro Tamura, Takeshi Izumida, Naoki Tokuda
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Patent number: 8994635Abstract: The invention provides an image display device capable of reducing the transmission delay of a scanning signal. A plurality of scanning signal lines are wired in one pixel circuit row. Pixel circuits of the pixel circuit row are connected to any of the plurality of scanning signal lines.Type: GrantFiled: June 5, 2009Date of Patent: March 31, 2015Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Kenta Kajiyama, Takeshi Izumida, Norihiro Nakamura, Naoki Tokuda
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Patent number: 8436841Abstract: A display apparatus includes data lines, scanning lines arranged to cross the data lines, and pixel circuits aligning along the data lines and the scanning lines, such that one of the pixel circuits corresponds to each intersection between the data lines and the scanning lines. In addition, image signal lines transmit image signals, and switches connect the data lines to the image signal lines so that each of the data lines is connected to one of the image signal lines. The data lines are arranged such that adjacent data lines form a pair of data lines, and adjacent pairs of data lines are spaced apart from each other by two columns of pixel-circuits. Respective data lines of the pair of data lines are connected by the switches to two different image signal lines, and the switches connecting the pair of data lines to corresponding image signal lines are activated simultaneously.Type: GrantFiled: November 16, 2009Date of Patent: May 7, 2013Assignees: Canon Kabushiki Kaisha, Hitachi Displays, Ltd.Inventors: Hiroyuki Maru, Masami Iseki, Fujio Kawano, Tatsuhito Goden, Takanori Yamashita, Kouji Ikeda, Takeshi Izumida, Hiroshi Kageyama
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Patent number: 8330711Abstract: A plurality of data signal lines each of which is connected to at least one pixel circuit in one pixel circuit column and is not connected to the pixel circuits of other pixel circuit columns are provided to one pixel circuit column, and the pixel circuits in the pixel circuit column are connected to any one of the plurality of data signal lines. An image display device having such a constitution can alleviate lowering of display quality attributed to transmission delay or voltage drop of a scanning signal.Type: GrantFiled: September 1, 2009Date of Patent: December 11, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Kenta Kajiyama, Takeshi Izumida, Norihiro Nakamura
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Publication number: 20120127221Abstract: An organic EL displaying apparatus which suppresses a defective display caused by a leak current at a time when an emission period controlling transistor is off is provided. The organic EL displaying apparatus comprises a plurality of pixels each of which includes an organic EL element, a power supply line, a driving transistor and the emission period controlling transistor, a data line, and a control line. In this apparatus, in a certain one of the pixels, a resistance Roff—ILM between source and drain electrodes of the emission period controlling transistor in an off state of the emission period controlling transistor, and a resistance Rbk—Dr between source and drain electrodes of the driving transistor in a state that a minimum gradation displaying data voltage has been applied to a gate electrode of the driving transistor satisfy Roff—ILM?Rbk—Dr.Type: ApplicationFiled: November 15, 2011Publication date: May 24, 2012Applicants: Hitachi Displays, Ltd., CANON KABUSHIKI KAISHAInventors: Junya Tamaki, Nobuhiko Sato, Masami Iseki, Kouji Ikeda, Masahiro Tamura, Takeshi Izumida, Naoki Tokuda
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Publication number: 20110310137Abstract: The present invention provides an image display device comprising data lines each supplying a data signal, and a plurality of pixel circuits. Each of the pixel circuits includes a light-emitting element, a capacitor which stores a difference in potential caused by the data signal therein, a drive transistor which has a gate electrode connected to the data line via the capacitor and controls light emission of the light-emitting element based on a difference in potential between the gate electrode and a source electrode thereof, which is generated by a potential supplied by the data line and the potential difference stored in the capacitor, and a variation control switch which causes the difference in potential between the gate and source electrodes of the drive transistor to vary based on the data signal at the turning on thereof and prevents the difference in potential from varying at the turning off thereof.Type: ApplicationFiled: June 17, 2011Publication date: December 22, 2011Inventors: Kenta Kajiyama, Takeshi Izumida, Naoki Tokuda, Hajime Akimoto
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Publication number: 20110234568Abstract: A display device includes: scanning lines for selecting a group of pixels out of pixels; control lines to which a pulse signal is supplied to control selection of at least one of the plurality of scanning lines to which a scanning signal is input; a scanning circuit which includes transistors controlled with the pulse signal, the scanning circuit being connected to the plurality of scanning lines and being disposed outside a display area; and a conductive mesh including conductive wires running in intersecting directions. The conductive mesh is placed above the transistors and the plurality of scanning lines except the display area. Above the plurality of scanning lines, the plurality of conductive wires constituting the conductive mesh intersect each other three-dimensionally in a manner that does not make the plurality of conductive wires parallel to the plurality of scanning lines.Type: ApplicationFiled: March 18, 2011Publication date: September 29, 2011Inventors: Takeshi IZUMIDA, Kenta Kajiyama, Naoki Tokuda, Yasuharu Yatsu, Noriyuki Shikina
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Publication number: 20110221791Abstract: An image display device includes pixel circuits, a power supply line, and a data line for supplying a data signal to the pixel circuits. The pixel circuits each include a light emitting element, a drive transistor for controlling light emission of the light emitting element, a storage capacitor provided between the data line and a gate electrode of the drive transistor, a both-end connection switch for connecting both ends of the storage capacitor to each other, and a current interruption switch for interrupting a path of a current flowing from the power supply line through the both-end connection switch. Before the data signal is supplied to each of the pixel circuits, the both-end connection switch connects the both ends of the storage capacitor to each other, and the current interruption switch is disconnected.Type: ApplicationFiled: March 8, 2011Publication date: September 15, 2011Inventors: Kenta KAJIYAMA, Takeshi Izumida, Naoki Tokuda, Hajime Akimoto, Hiroshi Kageyama, Norihiro Nakamura, Masami Iseki
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Publication number: 20110001767Abstract: An image display device includes signal lines; a video signal generating means which generates a video signal based on gray level information from the outside; a compensation signal generating means which generates a compensation signal based on the gray level information; a selecting means which alternately supplies the video signal and the compensation signal to the signal lines; and a plurality of pixel circuits which are connected to the signal lines. The compensation signal generating means generates the compensation signal based on the gray level information such that the larger the time integration of the potential of the video signal is, the smaller the time integration of the potential of the compensation signal is.Type: ApplicationFiled: July 1, 2010Publication date: January 6, 2011Inventors: Kenta KAJIYAMA, Hiroshi Kageyama, Takeshi Izumida
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Publication number: 20100128160Abstract: A display apparatus including: data lines; scanning lines arranged to cross the data lines; pixel circuits arranged along the data lines and the scanning lines, such that each of the pixel circuits corresponds to each of intersections between the data lines and the scanning lines; image signal lines for transmitting image signal; and switches, each arranged correspondingly to each of the data lines, for connecting each of the data lines to each one of the image signal lines, wherein the data lines are arranged such that adjacent two data lines are close to each other, and are connected simultaneously by the switches to different two of the image signal lines.Type: ApplicationFiled: November 16, 2009Publication date: May 27, 2010Applicants: CANON KABUSHIKI KAISHA, HITACHI DISPLAYS, LTD.Inventors: Hiroyuki Maru, Masami Iseki, Fujio Kawano, Tatsuhito Goden, Takanori Yamashita, Kouji Ikeda, Takeshi Izumida, Hiroshi Kageyama
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Publication number: 20100053042Abstract: A plurality of data signal lines each of which is connected to at least one pixel circuit in one pixel circuit column and is not connected to the pixel circuits of other pixel circuit columns are provided to one pixel circuit column, and the pixel circuits in the pixel circuit column are connected to any one of the plurality of data signal lines. An image display device having such a constitution can alleviate lowering of display quality attributed to transmission delay or voltage drop of a scanning signal.Type: ApplicationFiled: September 1, 2009Publication date: March 4, 2010Inventors: Kenta KAJIYAMA, Takeshi IZUMIDA, Norihiro NAKAMURA
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Publication number: 20100051958Abstract: A display device includes an insulation substrate on which TFT elements, first electrodes, light emitting layers and a second electrode are stacked in this order. Auxiliary lines are arranged between the insulation substrate and the second electrodes, and an insulation layer is interposed between the auxiliary lines and the second electrode. The auxiliary lines and the second electrode are connected with each other via contact holes formed in the insulation layer. Due to such a constitution, it is possible to enhance image quality of an organic EL display device.Type: ApplicationFiled: September 3, 2009Publication date: March 4, 2010Inventors: Takeshi Izumida, Kenta Kajiyama, Hajime Akimoto
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Publication number: 20090303164Abstract: The invention provides an image display device capable of reducing the transmission delay of a scanning signal. A plurality of scanning signal lines are wired in one pixel circuit row. Pixel circuits of the pixel circuit row are connected to any of the plurality of scanning signal lines.Type: ApplicationFiled: June 5, 2009Publication date: December 10, 2009Inventors: Kenta KAJIYAMA, Takeshi Izumida, Norihiro Nakamura, Naoki Tokuda