Patents by Inventor Kohei Ebisuno

Kohei Ebisuno 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: 20170352314
    Abstract: Pixel circuits each include a write transistor having a gate electrode connected to a write control line, one of a drain electrode and a source electrode connected to a data line for transmitting data voltage corresponding to luminance of the pixel circuit, and the other of the drain electrode and the source electrode connected to a gate electrode of a drive transistor. A compensation circuit includes a compensation transistor connected to a compensation signal line and the write control line. A compensation voltage generation circuit outputs compensation control voltage in accordance with a representative value of data voltage for the pixel circuits. A capacitance of the write control line caused by the compensation transistor and a capacitance of the write control line caused by the write transistors of the pixel circuits have mutually opposite voltage dependence with respect to the representative value of the data voltage for the pixel circuits.
    Type: Application
    Filed: May 31, 2017
    Publication date: December 7, 2017
    Applicant: JOLED INC.
    Inventors: Masafumi MATSUI, Hitoshi TSUGE, Kohei EBISUNO
  • Publication number: 20170309696
    Abstract: An active-matrix display device according to the present disclosure includes a plurality of pixels. Each of the pixels includes: a drive transistor disposed on a substrate; and an organic EL element that is caused by the drive transistor to emit light and includes an AM layer disposed above the substrate and a transparent electrode layer disposed above the AM layer. The active-matrix display device further includes: a source line that supplies data to the pixels; and a power supply line that supplies electric power to the pixels. The power supply line is shared by, among the plurality of pixels, two pixels that are adjacent to each other in a second direction that crosses a first direction in which the power supply line is extended. The source line and the AM layer are disposed not to overlap each other in a plan view of the substrate.
    Type: Application
    Filed: April 20, 2017
    Publication date: October 26, 2017
    Applicant: JOLED INC.
    Inventors: Kohei EBISUNO, Masafumi MATSUI, Hitoshi TSUGE
  • Publication number: 20170309227
    Abstract: A display device includes a plurality of pixels arranged in rows and columns, a plurality of first power lines that extend in a pixel column direction and through which a power supply voltage is supplied to the pixels, and a plurality of second power lines that extend in the pixel column direction and through which an initialization voltage different from the power supply voltage is to the pixels. The number of first power lines is greater than the number of second power lines.
    Type: Application
    Filed: April 20, 2017
    Publication date: October 26, 2017
    Applicant: JOLED INC.
    Inventors: Kohei EBISUNO, Masafumi MATSUI, Hitoshi TSUGE
  • Publication number: 20170287401
    Abstract: A plurality of pixel circuits included in a display device each includes: a drive transistor; a capacitor connected to a gate electrode and a source electrode of the drive transistor; a light-emitting element which is driven by the drive transistor; a write transistor having a gate electrode connected to a write control line for transmitting a write signal, one of a drain electrode and a source electrode connected to a data line for transmitting a data voltage corresponding to luminance, and the other of the drain electrode and the source electrode connected to the gate electrode of the drive transistor; and a compensation transistor having a gate electrode connected to the data line, and at least one of a drain electrode and a source electrode connected to the write control line, the compensation transistor being of same conductivity type as the write transistor.
    Type: Application
    Filed: March 28, 2017
    Publication date: October 5, 2017
    Applicant: JOLED INC.
    Inventors: Masafumi MATSUI, Hitoshi TSUGE, Kohei EBISUNO
  • Publication number: 20170270856
    Abstract: A method for driving a display device including a plurality of pixels arranged in rows and columns, each of the pixels including an organic EL device that emits light in accordance with supplied current, a driving transistor that supplies current to the organic EL device, and a storage capacitor connected between the gate of driving transistor and a source or drain thereof, includes causing the organic EL device to emit light by supplying current to the organic EL device; resetting charge of at least one of the storage capacitor and a parasitic capacitance of the organic EL device; and applying a reverse bias voltage between the gate and source of the driving transistor. The resetting is performed between the light emission and the reverse-bias application.
    Type: Application
    Filed: July 31, 2015
    Publication date: September 21, 2017
    Applicant: JOLED INC.
    Inventors: Kohei EBISUNO, Shinya ONO, Masafumi MATSUI
  • Patent number: 9019323
    Abstract: A display device according to the present invention includes: a variable voltage source which supplies a supply voltage to an organic EL display unit; and a voltage regulating unit which regulates an external application voltage output by the variable voltage source, the organic EL display unit further includes an anode-side power source line network and a cathode-side power source line network connected to the pixels and the variable voltage source, the display device further includes a voltage measuring unit which measures a voltage for a monitor pixel, and the voltage regulating unit which calculates distributions of voltage drop amount generated in the anode-side power source line network and the cathode-side power source line network, calculates a voltage for the monitor pixel from the distributions of the voltage drop amount calculated, and regulates the supply voltage based on the calculation result and the voltage measured by the voltage measuring unit.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: April 28, 2015
    Assignee: Joled, Inc.
    Inventors: Toshiyuki Kato, Kohei Ebisuno
  • Patent number: 8692746
    Abstract: According to one embodiment, an image display device includes a display panel including a pixel circuit, the pixel circuit including a light-emitting element, a driver element, and a capacitor element. The image display device further includes a charge supply line for supplying electrical charge to the light-emitting element of the pixel circuit; and a drive control unit which supplies second electrical charge from the charge supply line to the light-emitting element after first electrical charge accumulated in the light-emitting element is supplied to the capacitor element, further supplies the second electrical charge to the capacitor element and accumulates the first charge and the second charge in the capacitor element, and applies a voltage greater than or equal to the threshold voltage to a control terminal of the driver element, within one frame after the light-emitting element emits light until the light-emitting element emits light next.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: April 8, 2014
    Assignee: LG Display Co,. Ltd.
    Inventor: Kohei Ebisuno
  • Patent number: 8325116
    Abstract: An image display apparatus including a light-emitting device of which emission luminance varies with the amount of current, a first transistor in which the amount of current between a first electrode electrically connected to the light-emitting device and a second electrode is adjusted by the potential applied to a third electrode, so as to control the amount of current in the light-emitting device, a second transistor in which the amount of current between a fourth electrode electrically connected to the first electrode and a fifth electrode electrically connected to the third electrode is adjusted by the potential applied to a sixth electrode, and a capacitor having a seventh electrode electrically connected to the third electrode and an eighth electrode.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: December 4, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Shinji Takasugi, Kohei Ebisuno
  • Publication number: 20120280970
    Abstract: A display device according to the present invention includes: a variable voltage source which supplies a supply voltage to an organic EL display unit; and a voltage regulating unit which regulates an external application voltage output by the variable voltage source, the organic EL display unit further includes an anode-side power source line network and a cathode-side power source line network connected to the pixels and the variable voltage source, the display device further includes a voltage measuring unit which measures a voltage for a monitor pixel, and the voltage regulating unit which calculates distributions of voltage drop amount generated in the anode-side power source line network and the cathode-side power source line network, calculates a voltage for the monitor pixel from the distributions of the voltage drop amount calculated, and regulates the supply voltage based on the calculation result and the voltage measured by the voltage measuring unit.
    Type: Application
    Filed: July 13, 2012
    Publication date: November 8, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Toshiyuki Kato, Kohei Ebisuno
  • Publication number: 20110249044
    Abstract: According to one embodiment, an image display device includes a display panel including a pixel circuit, the pixel circuit including a light-emitting element, a driver element, and a capacitor element. The image display device further includes a charge supply line for supplying electrical charge to the light-emitting element of the pixel circuit; and a drive control unit which supplies second electrical charge from the charge supply line to the light-emitting element after first electrical charge accumulated in the light-emitting element is supplied to the capacitor element, further supplies the second electrical charge to the capacitor element and accumulates the first charge and the second charge in the capacitor element, and applies a voltage greater than or equal to the threshold voltage to a control terminal of the driver element, within one flume after the light-emitting element emits light until the light-emitting element emits light next.
    Type: Application
    Filed: November 30, 2009
    Publication date: October 13, 2011
    Applicant: KYOCERA CORPORATION
    Inventor: Kohei Ebisuno
  • Publication number: 20100182303
    Abstract: According to one embodiment, an image display device includes: a plurality of pixels including a light-emitting element, a driver element that controls light emission of the light-emitting element, and a capacitive element electrically connected to the driver element; and an image signal line that is commonly connected to the pixels for sequentially supplying, to the pixels, an image signal corresponding to luminous brightness of the light-emitting element. The pixel includes a shield electrode that shields an electric field from the image signal line to the capacitive element.
    Type: Application
    Filed: July 29, 2008
    Publication date: July 22, 2010
    Inventors: Shinji Takasugi, Kohei Ebisuno
  • Publication number: 20100103081
    Abstract: The life of an image display apparatus is lengthened while suppressing luminance unevenness and cross-talk on the screen. To achieve the object, an image display apparatus includes a light-emitting device of which emission luminance varies with the amount of current, a first transistorin which the amount of current between a first electrode electrically connected to the light-emitting device and a second electrode is adjusted by the potential applied to a third electrode, so as to control the amount of current in the light-emitting device, a second transistor in which the amount of current between a fourth electrode electrically connected to the first electrode and a fifth electrode electrically connected to the third electrode is adjusted by the potential applied to a sixth electrode, and a capacitor having a seventh electrode electrically connected to the third electrode and an eighth electrode.
    Type: Application
    Filed: January 31, 2008
    Publication date: April 29, 2010
    Inventors: Shinji Takasugi, Kohei Ebisuno