Patents by Inventor Eiji Kanda

Eiji Kanda 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).

  • Patent number: 10068527
    Abstract: A pixel includes five transistors and a capacitor. A first transistor controls current to be supplied to a light-emitting element. A second transistor is connected between a gate electrode of the first transistor and a first power supply. A third transistor is connected between the gate electrode of the first transistor and a second terminal of the first transistor. The capacitor is coupled between the third transistor and the second terminal of the first transistor. The fourth transistor is connected between the second terminal of the first transistor and a second power supply. The fifth transistor is connected between the second terminal of the third transistor and a signal line. The capacitor may be the only capacitor in the pixel, and the signal line may receive an initialization voltage and a gray scale data voltage.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: September 4, 2018
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Naoaki Komiya
  • Patent number: 9917145
    Abstract: A light-emitting device includes a drive transistor for controlling the quantity of current supplied to a light-emitting element, a capacitor element electrically connected to a gate electrode of the drive transistor, and an electrical continuity portion for electrically connecting the drive transistor and the light-emitting element, these elements being disposed on a substrate. The electrical continuity portion is disposed on the side opposite to the capacitor element with the drive transistor disposed therebetween.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: March 13, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Takehiko Kubota, Eiji Kanda, Ryoichi Nozawa
  • Patent number: 9886903
    Abstract: The pixel circuit includes a light-emitting element, an optical sensor for detecting a luminance of light emitted from the light-emitting element, and a compensation control circuit which controls the amount of the current supplied to the light-emitting element on the basis of a detection result of the optical sensor and a second voltage applied in a second interval different from a first interval with a predetermined length in which the light-emitting element is allowed to constantly emit light with a luminance based on a first voltage, and includes a first control circuit and a second control circuit where the first control circuit controls a first current amount for enabling the light-emitting element to emit light and the second control circuit controls a second current amount supplied to the light-emitting element.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: February 6, 2018
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Seiki Takahashi, Takeshi Okuno, Eiji Kanda
  • Patent number: 9824627
    Abstract: A display circuit includes a plurality of pixel circuits and a shared compensation transistor. Each pixel circuit includes a driving transistor to control light emission of a light emitter. The compensation transistor is to compensate the threshold voltages of the driving transistors of the pixel circuits.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: November 21, 2017
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Eiji Kanda, Masayuki Kumeta, Ryo Ishii
  • Patent number: 9747841
    Abstract: An electro-optical device selects a detection target pixel independently and obtains correction data to perform a correction operation. Under a control of the electro-optical device, remaining pixels other than the detection target pixel emit light to display an image.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: August 29, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda
  • Patent number: 9633592
    Abstract: A display device includes an acquiring circuit, a calculator, and a delay controller. The acquiring circuit acquires a gray scale voltage of a gray scale value of a pixel. The calculator calculates a first delay correction value based on a voltage currently retained on a data signal line to which the gray scale voltage is output and a gray scale voltage to be subsequently output to the data signal line. The delay controller determines a timing when the gray scale voltage is to be output to the data signal line based on the first delay correction value.
    Type: Grant
    Filed: October 1, 2014
    Date of Patent: April 25, 2017
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Masayuki Kumeta, Ryo Ishii, Takeshi Okuno, Eiji Kanda, Daisuke Kawae, Naoaki Komiya
  • Patent number: 9633625
    Abstract: A pixel circuit includes a plurality of pixels. Each pixel includes a data storage capacitor to store a voltage for controlling a gray scale value based on an input data signal, a plurality of switch transistors connected in series between a data signal line and the data storage capacitor, and a plurality of connection transistors coupled to the pixels. The switch transistors have a gate electrode connected to a first gate control signal line. At least one connection transistor is connected between at least one node between the switch transistors of a first pixel and at least one node between the switch transistors of a second pixel adjacent to the first pixel. The at least one connection transistor includes a gate electrode connected to a second gate control signal line.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: April 25, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Naoaki Komiya
  • Patent number: 9633598
    Abstract: A method for driving a display device includes driving a first pixel circuit based on first and second fields of a frame, and driving a second pixel circuit based on first and second fields of the frame. The first field of the first pixel circuit overlaps the second field of the second pixel circuit. The second field of the first pixel circuit overlaps the first field of the second pixel circuit. Operations performed in the first field include storing a gray scale data voltage, and operations performed in the second field include supplying an amount of current to a light emitter based on the stored gray scale data voltage. The first and second pixel circuits are in adjacent rows of the display device.
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: April 25, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Takeshi Okuno, Masayuki Kumeta, Eiji Kanda, Ryo Ishii, Naoaki Komiya
  • Patent number: 9633605
    Abstract: A pixel circuit includes a first path coupled to a gate of a driving transistor and a second path passing through a source and drain of the driving transistor. An initialization voltage of the driving transistor is set based on a gray scale data voltage carried along the first path. A voltage is stored in a capacitor coupled to the gate of the driving transistor based on the gray scale data voltage carried along the second path. The voltage stored in the capacitor is based on the gray scale data voltage, and may be compensated for variation in a threshold voltage of the driving transistor.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: April 25, 2017
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Ryo Ishii, Daisuke Kawae, Masayuki Kumeta, Eiji Kanda, Takeshi Okuno
  • Patent number: 9613567
    Abstract: A display device includes a pixel circuit having a driving transistor for driving a light-emitting element based on a gradation voltage held by a holding capacitor. The display device performs a first writing of gradation data using a first initialization voltage and a second writing of the gradation data using a second initialization voltage.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: April 4, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Takeshi Okuno, Masayuki Kumeta, Eiji Kanda, Ryo Ishii, Naoaki Komiya
  • Patent number: 9576530
    Abstract: An optoelectronic device includes a first transistor, a second transistor, and a control circuit. The first transistor is electrically connected between a power supply and a light-emitting element, has a gate to receive a gray scale voltage, and supplies the light-emitting element with a driving current corresponding to the gray scale voltage. The second transistor has a gate electrically connected to an electrode of the light-emitting element and a source or drain electrically connected to a circuit including a voltmeter. The control circuit reads a measurement value of the voltmeter when the gate of the first transistor receives the gray scale voltage, and corrects a next gray scale voltage applied to the gate of the first transistor based on the measurement value.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: February 21, 2017
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Eiji Kanda, Takeshi Okuno, Masayuki Kumeta, Daisuke Kawae, Ryo Ishii, Naoaki Komiya
  • Patent number: 9576533
    Abstract: A display apparatus includes a display unit, a control unit, and a compensation unit. The compensation unit may compensate the display data when a sensing operation is performed on a target pixel circuit, the compensation unit compensating display data by setting a light emission amount of light emitting element of a target pixel circuit to be an amount obtained by subtracting a sensing light emission amount, which is a light emission amount of the light emitting element of the target pixel circuit during a sensing interval, from a display light emission amount, which is a light emission amount of the light emitting element of the target pixel circuit before the compensation.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: February 21, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Masayuki Kumeta, Ryo Ishii, Eiji Kanda, Naoaki Komiya
  • Patent number: 9552766
    Abstract: An electroluminescence display device includes a controller which generates signals for controlling at least one pixel circuit during a first period and a second period. The controller controls current to a light-emitting element of the at least one pixel circuit based on a data voltage in the first period. The controller controls a supplying period of current to the light-emitting element based on a duty control voltage in the second period. The supplying period when the pixel circuit is driven at a first gray scale value is longer than that when the pixel circuit is driven at a second gray scale. The first gray scale value is greater than the second gray scale value.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: January 24, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Daisuke Kawae
  • Publication number: 20170004774
    Abstract: A pixel includes five transistors and a capacitor. A first transistor controls current to be supplied to a light-emitting element. A second transistor is connected between a gate electrode of the first transistor and a first power supply. A third transistor is connected between the gate electrode of the first transistor and a second terminal of the first transistor. The capacitor is coupled between the third transistor and the second terminal of the first transistor. The fourth transistor is connected between the second terminal of the first transistor and a second power supply. The fifth transistor is connected between the second terminal of the third transistor and a signal line. The capacitor may be the only capacitor in the pixel, and the signal line may receive an initialization voltage and a gray scale data voltage.
    Type: Application
    Filed: September 2, 2016
    Publication date: January 5, 2017
    Inventors: Masayuki KUMETA, Takeshi OKUNO, Eiji KANDA, Ryo ISHII, Naoaki KOMIYA
  • Patent number: 9514674
    Abstract: A display device includes a driving transistor in a pixel circuit. A signal line is connected to a source or drain of the driving transistor. The source or drain of the driving transistor receives a power source voltage, an initialization voltage, and a data voltage through the signal line during different periods of operation. The periods of operation include an emission and non-emission periods.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: December 6, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Naoaki Komiya
  • Patent number: 9472140
    Abstract: A device includes pixel circuits arranged in columns and rows, n data lines (n being an integer of 2 or more) for each column, gate lines supplied with scan signals, and light-emitting control lines supplied with light-emitting control signals. The pixel circuits are divided into n groups of rows, each group of rows being exclusively connected to a corresponding data line. Each pixel circuit includes a write control transistor to control writing a data voltage in response to a scan signal, a driving transistor to control the amount of current to be supplied to a current light-emitting element, a light-emitting control transistor to control supply of a current to the light-emitting element in response to a light-emitting control signal, a capacitor to retain a voltage corresponding to a write data voltage, and a reset transistor to set the gate electrode of the driving transistor with the initial voltage.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: October 18, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Eiji Kanda, Takeshi Okuno, Naoaki Komiya
  • Publication number: 20160276423
    Abstract: A light-emitting device includes a drive transistor for controlling the quantity of current supplied to a light-emitting element, a capacitor element electrically connected to a gate electrode of the drive transistor, and an electrical continuity portion for electrically connecting the drive transistor and the light-emitting element, these elements being disposed on a substrate. The electrical continuity portion is disposed on the side opposite to the capacitor element with the drive transistor disposed therebetween.
    Type: Application
    Filed: May 27, 2016
    Publication date: September 22, 2016
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Takehiko KUBOTA, Eiji KANDA, Ryoichi NOZAWA
  • Patent number: 9451677
    Abstract: A display device includes pixel circuits arranged in a matrix, each of the pixel circuits including: a light-emitting element; an optical sensor to detect luminance of light emitted from the light-emitting element; and a compensation control circuit including a first capacitor and a second capacitor, the first and second capacitors to maintain a second voltage applied to the compensation control circuit. The compensation control circuit controls the light-emitting element to constantly emit light having a luminance based on a first voltage during a first interval of a light emission interval. The compensation control circuit controls the amount of current supplied to the light-emitting element based on a detection result of the optical sensor and the second voltage maintained in the first and second capacitors during a second interval and a third interval of the light emission interval, respectively.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: September 20, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Seiki Takahashi, Takeshi Okuno, Eiji Kanda
  • Patent number: 9437136
    Abstract: A pixel includes five transistors and a capacitor. A first transistor controls current to be supplied to a light-emitting element. A second transistor is connected between a gate electrode of the first transistor and a first power supply. A third transistor is connected between the gate electrode of the first transistor and a second terminal of the first transistor. The capacitor is coupled between the third transistor and the second terminal of the first transistor. The fourth transistor is connected between the second terminal of the first transistor and a second power supply. The fifth transistor is connected between the second terminal of the third transistor and a signal line. The capacitor may be the only capacitor in the pixel, and the signal line may receive an initialization voltage and a gray scale data voltage.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: September 6, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Naoaki Komiya
  • Patent number: 9412295
    Abstract: A pixel circuit including a light emitting element outputting a gray scale based on a current supplied thereto, a first transistor configured to control an amount of current supplied to the light emitting element based on a gray scale data voltage supplied to a gate electrode of the first transistor, a second transistor connected between the gate electrode of the first transistor and an initialization voltage, a third transistor connected between the gate electrode of the first transistor and a first terminal of the first transistor; a fourth transistor connected between the first terminal of the first transistor and the light emitting element, and a fifth transistor connected between a second terminal of the first transistor and a data line. The data line is selectively supplied with the gray scale data voltage and a power supply voltage for light emitting of the light emitting element to the fifth transistor.
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: August 9, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Takeshi Okuno, Masayuki Kumeta, Eiji Kanda, Ryo Ishii, Naoaki Komiya