Patents by Inventor Masayuki Kumeta

Masayuki Kumeta 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: 20160117989
    Abstract: A display apparatus includes a display unit including a plurality of pixel circuits, each of the pixel circuits includes: a light emitting device; a driving transistor; a display data updating circuit including a display data capacitor; a threshold voltage compensation circuit including a threshold voltage capacitor; and a switch transistor connected to the display data capacitor and the threshold voltage capacitor. The display data capacitor is electrically disconnected from the threshold voltage capacitor when updating of display data and compensation of a threshold voltage of the driving transistor are performed, and the display data capacitor is electrically connected to the threshold voltage capacitor when the light emitting device emits light.
    Type: Application
    Filed: October 21, 2015
    Publication date: April 28, 2016
    Inventors: Masayuki Kumeta, Ryo Ishii, Seiki Takahashi
  • Patent number: 9269297
    Abstract: An electro-optical device includes a driving transistor, a first capacitor, a second capacitor, and a switching circuit. The driving transistor is connected between a power supply and an electrode of a light-emitting element. The first capacitor is connected between a gate and source of the driving transistor. The second capacitor stores a gray scale voltage. The switching circuit selectively connects the first capacitor and the second capacitor to the gate of the driving transistor. A control circuit applies the gray scale voltage to the second capacitor while the first capacitor is connected to the gate of the driving transistor by the switching circuit, and writes a source voltage of the driving transistor at the first capacitor while the second capacitor is connected to the gate of the driving transistor by the switching circuit.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: February 23, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Eiji Kanda, Takeshi Okuno, Masayuki Kumeta, Daisuke Kawae, Ryo Ishii, Naoaki Komiya
  • Publication number: 20150364085
    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: Application
    Filed: June 8, 2015
    Publication date: December 17, 2015
    Inventors: Eiji KANDA, Masayuki KUMETA, Ryo ISHII
  • Publication number: 20150356942
    Abstract: A voltage control circuit of a display device includes a first power line, a second power line, a third power line, and a filter circuit. The second power line is connected to the first power line at a central portion of a predetermined area. The third power line is in the predetermined area. The filter circuit is between the second and third power lines, and includes at least one element having a larger resistance value per unit length than a resistance value per unit length of at least one of the second or third power lines.
    Type: Application
    Filed: June 9, 2015
    Publication date: December 10, 2015
    Inventors: Eiji KANDA, Takeshi OKUNO, Masayuki KUMETA, Daisuke KAWAE, Ryo ISHII
  • Patent number: 9196225
    Abstract: A driving method of an electro-optic device includes initializing a gate voltage of a driving transistor; and performing a data write operation where a threshold voltage of the driving transistor is compensated by turning on a first transistor and a second transistor connected in series between a drain and a gate of the driving transistor and a voltage is provided to a capacity element connected to the gate of the driving transistor to hold a voltage of the compensated data signal as a gate voltage. The first transistor is at a drain side of the driving transistor and the second transistor is between the first transistor and a gate side of the driving transistor. When the data write operation ends, the second transistor is first turned off and, subsequently, the first transistor is turned off. The second transistor is again turned on after the first transistor is turned off.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: November 24, 2015
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Eiji Kanda, Masayuki Kumeta, Ryo Ishii, Takeshi Okuno, Naoaki Komiya
  • Publication number: 20150279269
    Abstract: A display apparatus includes a scan line driver and a data line driver. The data line driver supplies data signals to turn on or off pixel circuits connected to selected scan lines. The pixel circuits are turned on or off in sub frames. For each scan line, the sub frames are assigned in the display period based on a reference point. During a preliminary period, the scan line driver selects a scan line and the data line driving circuit supplies a data signal to the pixel circuit based on the reference point. During the display period, the scan line driver selects scan line connected to the pixel circuit in synchronization with an initiation timing of each sub frame of the display period. The data line driver supplies the data signal to the pixel circuit based on the state of the sub frame corresponding to initiation timing.
    Type: Application
    Filed: March 25, 2015
    Publication date: October 1, 2015
    Inventors: Ryo ISHII, Daisuke KAWAE, Masayuki KUMETA, Eiji KANDA, Takeshi OKUNO
  • Publication number: 20150243226
    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: Application
    Filed: February 19, 2015
    Publication date: August 27, 2015
    Inventors: Masayuki KUMETA, Ryo ISHII, Eiji KANDA, Naoaki KOMIYA
  • Publication number: 20150154941
    Abstract: A driving method of an electro-optic device includes initializing a gate voltage of a driving transistor; and performing a data write operation where a threshold voltage of the driving transistor is compensated by turning on a first transistor and a second transistor connected in series between a drain and a gate of the driving transistor and a voltage is provided to a capacity element connected to the gate of the driving transistor to hold a voltage of the compensated data signal as a gate voltage. The first transistor is at a drain side of the driving transistor and the second transistor is between the first transistor and a gate side of the driving transistor. When the data write operation ends, the second transistor is first turned off and, subsequently, the first transistor is turned off. The second transistor is again turned on after the first transistor is turned off.
    Type: Application
    Filed: December 3, 2013
    Publication date: June 4, 2015
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Eiji KANDA, Masayuki KUMETA, Ryo ISHII, Takeshi OKUNO, Naoaki KOMIYA
  • Publication number: 20150097871
    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: Application
    Filed: October 1, 2014
    Publication date: April 9, 2015
    Inventors: Masayuki KUMETA, Ryo ISHII, Takeshi OKUNO, Eiji KANDA, Daisuke KAWAE, Naoaki KOMIYA
  • Publication number: 20150062195
    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: Application
    Filed: August 26, 2014
    Publication date: March 5, 2015
    Inventors: Masayuki KUMETA, Takeshi OKUNO, Eiji KANDA, Ryo ISHII, Daisuke KAWAE
  • Publication number: 20150061537
    Abstract: An optoelectronic device includes a driving transistor, a correction transistor, and a control circuit. The driving transistor adjusts a first current from a power supply based on a voltage stored in a first capacitor. The driving transistor supplies the adjusted first current to the light-emitting element. The correction transistor is electrically connected on a path of a second current flowing from the power supply to the first capacitor, and adjusts the second current based on a voltage stored in a second capacitor. The control circuit controls the second capacitor to store a gray scale voltage while the first current flows, and controls flow of the second current to update the voltage stored in the first capacitor while the first current is blocked.
    Type: Application
    Filed: August 28, 2014
    Publication date: March 5, 2015
    Inventors: Eiji KANDA, Takeshi OKUNO, Masayuki KUMETA, Daisuke KAWAE, Ryo ISHII, Naoaki KOMIYA
  • Publication number: 20150062193
    Abstract: An electro-optical device includes a driving transistor, a first capacitor, a second capacitor, and a switching circuit. The driving transistor is connected between a power supply and an electrode of a light-emitting element. The first capacitor is connected between a gate and source of the driving transistor. The second capacitor stores a gray scale voltage. The switching circuit selectively connects the first capacitor and the second capacitor to the gate of the driving transistor. A control circuit applies the gray scale voltage to the second capacitor while the first capacitor is connected to the gate of the driving transistor by the switching circuit, and writes a source voltage of the driving transistor at the first capacitor while the second capacitor is connected to the gate of the driving transistor by the switching circuit.
    Type: Application
    Filed: August 20, 2014
    Publication date: March 5, 2015
    Inventors: Eiji KANDA, Takeshi OKUNO, Masayuki KUMETA, Daisuke KAWAE, Ryo ISHII, Naoaki KOMIYA
  • Publication number: 20150054722
    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: Application
    Filed: August 26, 2014
    Publication date: February 26, 2015
    Inventors: Eiji KANDA, Takeshi OKUNO, Masayuki KUMETA, Daisuke KAWAE, Ryo ISHII, Naoaki KOMIYA
  • Publication number: 20150049103
    Abstract: A control circuit for a frame memory includes a divider, a frame memory, a read control circuit, and a write control circuit. The divider divides image data into subfield data according to a plurality of subfields, where the image data is provided in synchronization with a first synchronization signal and in a unit of a frame. The frame memory has a plurality of blocks to store the subfield data. The read control circuit sequentially reads the subfield data from the blocks in synchronization with a second synchronization signal. The write control circuit writes new data to a first block before data written in a second block is read, and after data written in the first block is read by the read control circuit. The second synchronization signal may have a same cycle as the first synchronization signal and may be delayed by a preset delay time.
    Type: Application
    Filed: October 29, 2014
    Publication date: February 19, 2015
    Inventors: Masayuki KUMETA, Ryo ISHII, Kazuhiro MATSUMOTO, Shinji YAMASHITA, Ansu LEE
  • Publication number: 20150035871
    Abstract: A display device includes a plurality of pixels, a gate control line electrically connected to the pixels, an auxiliary power line isolated from the gate control line, and a number of auxiliary switches between the gate control line and the auxiliary power line. The at least one auxiliary switch is controlled by an auxiliary control line isolated from the auxiliary power line and the gate control line. The at least one auxiliary switch electrically connects the gate control line and the auxiliary power line.
    Type: Application
    Filed: August 4, 2014
    Publication date: February 5, 2015
    Inventors: Daisuke KAWAE, Ryo ISHII, Masayuki KUMETA
  • Publication number: 20150002558
    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: July 1, 2014
    Publication date: January 1, 2015
    Inventors: Masayuki KUMETA, Takeshi OKUNO, Eiji KANDA, Ryo ISHII, Naoaki KOMIYA
  • Publication number: 20150002557
    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: Application
    Filed: June 30, 2014
    Publication date: January 1, 2015
    Inventors: Ryo ISHII, Daisuke KAWAE, Masayuki KUMETA, Eiji KANDA, Takeshi OKUNO
  • Publication number: 20140347405
    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: Application
    Filed: May 21, 2014
    Publication date: November 27, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Masayuki KUMETA, Takeshi OKUNO, Eiji KANDA, Ryo ISHII, Naoaki KOMIYA
  • Publication number: 20140340436
    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: Application
    Filed: May 15, 2014
    Publication date: November 20, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Masayuki KUMETA, Takeshi OKUNO, Eiji KANDA
  • Publication number: 20140333682
    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: Application
    Filed: May 5, 2014
    Publication date: November 13, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Takeshi OKUNO, Masayuki KUMETA, Eiji KANDA, Ryo ISHII, Naoaki KOMIYA