Patents by Inventor Fumiyuki Kobayashi

Fumiyuki Kobayashi 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: 20240090281
    Abstract: In a display device, a first power supply voltage line includes a first trunk wiring line, a plurality of branch wiring lines, and a second power supply voltage line includes a second trunk wiring line. The first trunk wiring line includes a first portion and a second portion. A line width of the first portion is smaller than a line width of the second portion. A frame region in a frame region provided with the first portion includes a first irregular frame edge having an irregular shape.
    Type: Application
    Filed: November 6, 2019
    Publication date: March 14, 2024
    Inventors: JUNICHI YAMADA, NAOKI UEDA, FUMIYUKI KOBAYASHI
  • Patent number: 11922877
    Abstract: The present disclosure achieves a display device provided with a pixel circuit that enables both high-frequency drive and low-frequency drive without causing deterioration in display quality. In a pixel circuit (20), a holding capacitor (C1) is provided between a second control node (NA) connected to a data signal line via a write control transistor (T3) and a first control node (NG) connected to a control terminal of a drive transistor (T4). An oxide thin-film transistor (TFT) is employed for each of a first initialization transistor (T1) having a second conductive terminal connected to the first control node (NG) and a threshold voltage compensation transistor (T2) having a first conductive terminal connected to the first control node (NG).
    Type: Grant
    Filed: July 22, 2020
    Date of Patent: March 5, 2024
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Fumiyuki Kobayashi
  • Publication number: 20240049527
    Abstract: A display includes: a light-emitting element; a first data signal line to which a signal corresponding to video data is supplied in a vertical scanning period and a signal not corresponding to video data is supplied in an update pause period; a drive transistor configured to control a current value of the light-emitting element; and a conductor electrically connected to a gate electrode of the drive transistor; a shield electrode located between the first data signal line and the conductor and adjacent to each of the first data signal line and the conductor in a plan view.
    Type: Application
    Filed: December 11, 2020
    Publication date: February 8, 2024
    Inventor: FUMIYUKI KOBAYASHI
  • Publication number: 20230298522
    Abstract: The present disclosure achieves a display device provided with a pixel circuit that enables both high-frequency drive and low-frequency drive without causing deterioration in display quality. In a pixel circuit (20), a holding capacitor (C1) is provided between a second control node (NA) connected to a data signal line via a write control transistor (T3) and a first control node (NG) connected to a control terminal of a drive transistor (T4). An oxide thin-film transistor (TFT) is employed for each of a first initialization transistor (T1) having a second conductive terminal connected to the first control node (NG) and a threshold voltage compensation transistor (T2) having a first conductive terminal connected to the first control node (NG).
    Type: Application
    Filed: July 22, 2020
    Publication date: September 21, 2023
    Inventor: Fumiyuki KOBAYASHI
  • Patent number: 11527200
    Abstract: A pixel circuit of a display device Includes: an electro-optical element; a drive transistor; a write control transistor; a threshold compensation transistor; two light emission control transistors; a first initialization transistor having a first conduction terminal connected to a gate terminal of the drive transistor, a second conduction terminal to which an initialization voltage is applied, and a gate terminal connected to a first initialization control line; and a capacitor provided between a first conductive member and the gate terminal of the drive transistor. In a non-light emission period, time during which a voltage of the first initialization control line is at an on-level is longer than a period during which a voltage of a scanning line is at the on-level. As a result, a display device capable of sufficiently initializing the gate terminal of the drive transistor is provided.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: December 13, 2022
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Fumiyuki Kobayashi
  • Publication number: 20220344429
    Abstract: A display device includes: a plurality of pixel circuits each including a retention capacitor and a drive transistor. Each of those two of the plurality of pixel circuits which are adjacent in a row direction has a first opening in a capacitor line around a first contact hole in a plan view. A retention capacitor is at least partially provided in an overlapping region of a capacitor electrode and the capacitor line. The capacitor line has a second opening between two adjacent first openings and includes a first connecting line and a second connecting line opposite each other in a column direction across the second opening.
    Type: Application
    Filed: September 30, 2019
    Publication date: October 27, 2022
    Inventors: FUMIYUKI KOBAYASHI, TAMOTSU SAKAI
  • Publication number: 20220223106
    Abstract: A pixel circuit of a display device Includes: an electro-optical element; a drive transistor; a write control transistor; a threshold compensation transistor; two light emission control transistors; a first initialization transistor having a first conduction terminal connected to a gate terminal of the drive transistor, a second conduction terminal to which an initialization voltage is applied, and a gate terminal connected to a first initialization control line; and a capacitor provided between a first conductive member and the gate terminal of the drive transistor. In a non-light emission period, time during which a voltage of the first initialization control line is at an on-level is longer than a period during which a voltage of a scanning line is at the on-level. As a result, a display device capable of sufficiently initializing the gate terminal of the drive transistor is provided.
    Type: Application
    Filed: March 28, 2019
    Publication date: July 14, 2022
    Inventor: FUMIYUKI KOBAYASHI
  • Publication number: 20220190097
    Abstract: A first pixel circuit and a third pixel circuit are connected to a first scan signal line, and a second pixel circuit and a fourth pixel circuit are connected to a second scan signal line. Of two first pixel circuits connected to a common, first scan signal line, a capacitive element in the first pixel circuit in a group that is located farther in a row direction from a center of a display area has a larger capacitance value than does a capacitive element in the first pixel circuit in a group that is located closer.
    Type: Application
    Filed: April 26, 2019
    Publication date: June 16, 2022
    Inventors: TAMOTSU SAKAI, FUMIYUKI KOBAYASHI, TAKESHI YANEDA
  • Patent number: 11195459
    Abstract: A pixel circuit of a display device includes an electro-optical element, a drive transistor, a first transistor including a first conduction terminal connected to a gate terminal of the drive transistor and a second conduction terminal to which an initialization voltage is applied, and a second transistor diode-connected and including a source terminal connected to an anode terminal of the electro-optical element. A drain terminal and a gate terminal of the second transistor are connected to a scanning line or an immediately preceding scanning line selected in a horizontal interval immediately before a horizontal interval at which the pixel circuit is written. Thus, a display device that can suppress both the bright spots and the black floating is provided.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: December 7, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Fumiyuki Kobayashi
  • Patent number: 11127349
    Abstract: A pixel circuit of a display device includes an electro-optical element, a drive transistor, a first transistor including a first conduction terminal connected to an anode terminal of the electro-optical element, a second conduction terminal to which an initialization voltage is applied, and a gate terminal connected to a scanning line, a second transistor including a first conduction terminal connected to a gate terminal of the drive transistor and a gate terminal connected to an immediately preceding scanning line selected in a horizontal interval immediately before the scanning line is selected, and a third transistor being diode-connected and including a drain terminal and a gate terminal to which an initialization voltage is applied and a source terminal connected to a second conduction terminal of the second transistor. Thus, a display device that can suppress both the bright spots and the black floating is provided.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: September 21, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Fumiyuki Kobayashi
  • Patent number: 11004397
    Abstract: Provided is a pixel circuit including: an electro-optical element, a driving transistor; a writing control transistor whose first conduction terminal is connected to a data line and whose control terminal is connected to a scanning line; and an initialization transistor whose first conduction terminal is connected to a control terminal of the driving transistor, to whose second conduction terminal an initialization voltage is applied, and whose control terminal is connected to a first control line. In a case of a P-channel transistor, a high-level voltage to be given to the control terminal of the initialization transistor is lower than a high-level voltage to be given to the control terminal of the writing control transistor.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: May 11, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Fumiyuki Kobayashi, Tamotsu Sakai, Shigetsugu Yamanaka
  • Publication number: 20210110773
    Abstract: Provided is a pixel circuit including: an electro-optical element, a driving transistor; a writing control transistor whose first conduction terminal is connected to a data line and whose control terminal is connected to a scanning line; and an initialization transistor whose first conduction terminal is connected to a control terminal of the driving transistor, to whose second conduction terminal an initialization voltage is applied, and whose control terminal is connected to a first control line. In a case of a P-channel transistor, a high-level voltage to be given to the control terminal of the initialization transistor is lower than a high-level voltage to be given to the control terminal of the writing control transistor.
    Type: Application
    Filed: September 21, 2017
    Publication date: April 15, 2021
    Inventors: Fumiyuki KOBAYASHI, Tamotsu SAKAI, Shigetsugu YAMANAKA
  • Publication number: 20200410933
    Abstract: A pixel circuit of a display device includes an electro-optical element, a drive transistor, a first transistor including a first conduction terminal connected to an anode terminal of the electro-optical element, a second conduction terminal to which an initialization voltage is applied, and a gate terminal connected to a scanning line, a second transistor including a first conduction terminal connected to a gate terminal of the drive transistor and a gate terminal connected to an immediately preceding scanning line selected in a horizontal interval immediately before the scanning line is selected, and a third transistor being diode-connected and including a drain terminal and a gate terminal to which an initialization voltage is applied and a source terminal connected to a second conduction terminal of the second transistor. Thus, a display device that can suppress both the bright spots and the black floating is provided.
    Type: Application
    Filed: April 27, 2018
    Publication date: December 31, 2020
    Applicant: SHARP KABUSHIKI KAISHA
    Inventor: FUMIYUKI KOBAYASHI
  • Publication number: 20200410932
    Abstract: A pixel circuit of a display device includes an electro-optical element, a drive transistor, a first transistor including a first conduction terminal connected to a gate terminal of the drive transistor and a second conduction terminal to which an initialization voltage is applied, and a second transistor diode-connected and including a source terminal connected to an anode terminal of the electro-optical element. A drain terminal and a gate terminal of the second transistor are connected to a scanning line or an immediately preceding scanning line selected in a horizontal interval immediately before a horizontal interval at which the pixel circuit is written. Thus, a display device that can suppress both the bright spots and the black floating is provided.
    Type: Application
    Filed: March 28, 2018
    Publication date: December 31, 2020
    Inventor: FUMIYUKI KOBAYASHI
  • Patent number: 10861392
    Abstract: Provided are a display device drive method and a display device, both of which allow a pixel circuit to be discharged without leaving any electric charge in an OFF sequence for powering off the display device. During an OFF sequence period, a first node N1 is set to a first ground potential Vgnd1, which is a potential higher than an initialization potential Vini. As a result, even when a second ground potential Vgnd2 is supplied through a data line Dj to a second conductive terminal of a drive transistor T1, a gate terminal of the drive transistor T1 is not charged with a gate-to-source voltage Vgs. Therefore, an organic EL display device 1 is powered off with the gate terminal of the drive transistor T1 being charged with the first ground potential Vgnd1 leaving no electric charge in a pixel circuit 11 after the power off.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: December 8, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Makoto Yokoyama, Fumiyuki Kobayashi, Junichi Yamada
  • Patent number: 10657893
    Abstract: The present application discloses a display device and a driving method thereof using the SSD method capable of charge with the data voltage in the pixel circuit and sufficient internal compensation even if the high resolution of a display image is improved. m demultiplexers corresponding to m sets of data signal line groups with k data signal lines being one set are provided. Each demultiplexer sets a prescribed period in a period after a time point when to start supplying a data signal output last in each of horizontal intervals among m data signals to a time point before a time point when to end supplying the data signal is set in advance as a delay period, and a scanning line drive circuit starts to select a scanning line corresponding to the pixel circuit to which the prescribed number of data signals are supplied, when the delay period of each of the horizontal intervals ends.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: May 19, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Masahiro Mitani, Fumiyuki Kobayashi, Makoto Yokoyama
  • Publication number: 20200135110
    Abstract: The present application discloses an organic EL display device adopting the SSD method, which enables sufficient charging with a data voltage and sufficient internal compensation in a pixel circuit even in a case that a display image has a higher resolution. There are provided m demultiplexers corresponding to m sets of data signal line groups, each of which is a set including k data signal lines (in this case, k=2). Each demultiplexer simultaneously turns selection control signals at a low level (active) during a reset period before a scanning signal line is selected. In this case, a white voltage is supplied as a reset voltage from a data-side drive circuit to each data signal line via each demultiplexer. After that, during the select period for the scanning signal line, each demultiplexer sequentially switches, with the selection control signals, a data signal line to which the data signal is to be supplied from the data-side drive circuit among corresponding k data signal lines.
    Type: Application
    Filed: March 24, 2017
    Publication date: April 30, 2020
    Inventors: Makoto YOKOYAMA, Masahiro MITANI, Tamotsu SAKAI, Fumiyuki KOBAYASHI
  • Publication number: 20200098316
    Abstract: Provided are a display device drive method and a display device, both of which allow a pixel circuit to be discharged without leaving any electric charge in an OFF sequence for powering off the display device. During an OFF sequence period, a first node N1 is set to a first ground potential Vgnd1, which is a potential higher than an initialization potential Vini. As a result, even when a second ground potential Vgnd2 is supplied through a data line Dj to a second conductive terminal of a drive transistor T1, a gate terminal of the drive transistor T1 is not charged with a gate-to-source voltage Vgs. Therefore, an organic EL display device 1 is powered off with the gate terminal of the drive transistor T1 being charged with the first ground potential Vgnd1 leaving no electric charge in a pixel circuit 11 after the power off.
    Type: Application
    Filed: March 22, 2017
    Publication date: March 26, 2020
    Inventors: Makoto YOKOYAMA, Fumiyuki KOBAYASHI, Junichi YAMADA
  • Publication number: 20200013331
    Abstract: The disclosure has an object to suppress reduction in display quality due to insufficient charge in a display device adopting a Source Shared Driving (SSD) method. A display device includes a demultiplexer portion including switches. Three switches are provided for each of output portions of a source driver to enable a data signal to be distributed to three data lines. In display of a moving picture, a driving frequency is set to a frequency higher than a driving frequency in display of a still picture, and the three switches are simultaneously turned to an ON state in each of horizontal scan periods. In display of a still picture, the driving frequency is set to a frequency lower than the driving frequency in display of a moving picture is performed, and the three switches are sequentially turned to an ON state at predetermined intervals in each of the horizontal scan periods.
    Type: Application
    Filed: September 14, 2017
    Publication date: January 9, 2020
    Inventor: Fumiyuki KOBAYASHI
  • Publication number: 20190371240
    Abstract: The present application discloses a display device and a driving method thereof using the SSD method capable of charge with the data voltage in the pixel circuit and sufficient internal compensation even if the high resolution of a display image is improved. m demultiplexers corresponding to m sets of data signal line groups with k data signal lines being one set are provided. Each demultiplexer sets a prescribed period in a period after a time point when to start supplying a data signal output last in each of horizontal intervals among m data signals to a time point before a time point when to end supplying the data signal is set in advance as a delay period, and a scanning line drive circuit starts to select a scanning line corresponding to the pixel circuit to which the prescribed number of data signals are supplied, when the delay period of each of the horizontal intervals ends.
    Type: Application
    Filed: June 19, 2017
    Publication date: December 5, 2019
    Inventors: Masahiro MITANI, Fumiyuki KOBAYASHI, Makoto YOKOYAMA