Patents by Inventor Shigeo HOMURA

Shigeo HOMURA 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: 10984716
    Abstract: An active-matrix display device includes a pixel matrix having a plurality of pixel cells arranged in rows and columns, and a data line disposed for each of the columns in the pixel matrix and connected to each pixel cell in a column. Each pixel cell includes a holding capacitor, including a first electrode connected to a gate of the drive transistor, a lower electrode connected to a source of the drive transistor, and an upper electrode connected to the source of the drive transistor. At least one of the lower electrode and the upper electrode protrudes toward the data line from a facing region in a plan view of the pixel matrix, such that a protruded amount, which is an amount of protrusion toward the data line, is greater than or equal to 15% of a distance between the data line and the first electrode in the facing region.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: April 20, 2021
    Assignee: JOLED INC.
    Inventor: Shigeo Homura
  • Publication number: 20210104193
    Abstract: A display device includes: pixels arranged in a matrix; a plurality of write signal lines for selecting a pixel row to which a data voltage is to be written; a gate driver that supplies a gate signal; a plurality of data signal lines for writing the data voltage; a data driver that supplies the data voltage; a data selector circuit that supplies, per at least one data signal line by time division, the data voltage; and a controller. Each of the pixels includes a light-emitting element, a capacitor element, and a drive transistor that supplies a current in accordance with the voltage held by the capacitor element to the light-emitting element. The controller causes the gate driver and the data driver to perform an initialization operation on pixels in a second pixel row after a period during which a write operation is performed on pixels in a first pixel row.
    Type: Application
    Filed: August 25, 2020
    Publication date: April 8, 2021
    Applicant: JOLED INC.
    Inventor: Shigeo HOMURA
  • Publication number: 20200211462
    Abstract: An active-matrix display device includes a pixel matrix having a plurality of pixel cells arranged in rows and columns, and a data line disposed for each of the columns in the pixel matrix and connected to each pixel cell in a column. Each pixel cell includes a holding capacitor, including a first electrode connected to a gate of the drive transistor, a lower electrode connected to a source of the drive transistor, and an upper electrode connected to the source of the drive transistor. At least one of the lower electrode and the upper electrode protrudes toward the data line from a facing region in a plan view of the pixel matrix, such that a protruded amount, which is an amount of protrusion toward the data line, is greater than or equal to 15% of a distance between the data line and the first electrode in the facing region.
    Type: Application
    Filed: March 6, 2020
    Publication date: July 2, 2020
    Applicant: JOLED INC.
    Inventor: Shigeo HOMURA
  • Patent number: 10644092
    Abstract: A display panel includes a contact area which includes an upper conductive layer forming first electrodes of the organic EL elements, a lower conductive layer disposed below the upper conductive layer, a middle layer between the upper conductive layer and the lower conductive layer, and an insulating layer between the lower conductive layer and the middle layer. The middle layer includes a first area and a second area which are conductive and electrically connected to the upper conductive layer, and an insulating separating area which separates the first area and the second area. The lower conductive layer includes a first line which is electrically connected to the first area via a first contact hole, and a second line which is electrically connected to the second area via a second contact hole.
    Type: Grant
    Filed: August 2, 2018
    Date of Patent: May 5, 2020
    Assignee: JOLED INC.
    Inventors: Kenji Kokuda, Masafumi Matsui, Hitoshi Tsuge, Takashi Osako, Shigeo Homura, Ryoichi Yasuda
  • Patent number: 10629123
    Abstract: In an active-matrix display device, each of the plurality of pixels includes a holding capacitor that includes: a gate electrode that is included in a first wiring layer and is connected to a gate of a drive transistor which drives a light-emitting element; a first source electrode that is included in a lower wiring layer disposed lower than the first wiring layer and is connected to a source of the drive transistor; and a second source electrode that is included in an upper wiring layer disposed higher than the first wiring layer and is connected to a source of the drive transistor. At least one of the first source electrode and the second source electrode protrudes toward the data line from the facing region and overlaps the gate electrode in the facing region in the plan view of the pixel matrix.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: April 21, 2020
    Assignee: JOLED INC.
    Inventor: Shigeo Homura
  • Publication number: 20190115413
    Abstract: A display panel includes a contact area which includes an upper conductive layer forming first electrodes of the organic EL elements, a lower conductive layer disposed below the upper conductive layer, a middle layer between the upper conductive layer and the lower conductive layer, and an insulating layer between the lower conductive layer and the middle layer. The middle layer includes a first area and a second area which are conductive and electrically connected to the upper conductive layer, and an insulating separating area which separates the first area and the second area. The lower conductive layer includes a first line which is electrically connected to the first area via a first contact hole, and a second line which is electrically connected to the second area via a second contact hole.
    Type: Application
    Filed: August 2, 2018
    Publication date: April 18, 2019
    Applicant: JOLED INC.
    Inventors: Kenji KOKUDA, Masafumi MATSUI, Hitoshi TSUGE, Takashi OSAKO, Shigeo HOMURA, Ryoichi YASUDA
  • Publication number: 20190051241
    Abstract: In an active-matrix display device, each of the plurality of pixels includes a holding capacitor that includes: a gate electrode that is included in a first wiring layer and is connected to a gate of a drive transistor which drives a light-emitting element; a first source electrode that is included in a lower wiring layer disposed lower than the first wiring layer and is connected to a source of the drive transistor; and a second source electrode that is included in an upper wiring layer disposed higher than the first wiring layer and is connected to a source of the drive transistor. At least one of the first source electrode and the second source electrode protrudes toward the data line from the facing region and overlaps the gate electrode in the facing region in the plan view of the pixel matrix.
    Type: Application
    Filed: June 19, 2018
    Publication date: February 14, 2019
    Applicant: JOLED INC.
    Inventor: Shigeo HOMURA
  • Patent number: 10074308
    Abstract: Provided is a method for driving a display device including: a display unit having a sub-pixel having a first light emitting element (organic EL element) and a first driving transistor for supplying a first electric current corresponding to a first gray level signal, and a sub-pixel having a second light emitting element (organic EL element) and a second driving transistor for supplying a second electric current corresponding to a second gray level signal; and a power supply unit configured to apply a power supply voltage to each sub-pixel via an electric current path that is common to the sub-pixel and the sub-pixel. The driving method includes correcting the first gray level signal based on the first gray level signal and the second gray level signal so as to compensate for a reduction in the first electric current caused by a voltage drop that occurs in the electric current path.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: September 11, 2018
    Assignee: JOLED INC.
    Inventors: Shinya Ono, Shigeo Homura
  • Patent number: 10049622
    Abstract: A method for driving a display device that includes a display unit and is driven by a sequence of row-by-row sequential scanning that includes a vertical blanking period, the display unit having pixels arranged in rows and columns, each pixel including an anode formed on a drive circuit layer, an organic light emitting layer formed above the anode and including a light emitting substance, and a transparent cathode formed above the organic light emitting layer, the method includes initializing a circuit element, writing a signal voltage to a capacitive element, inserting a black display to display the black display during a period determined based on a resistance value of the transparent cathode, and causing the organic EL element to emit light.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: August 14, 2018
    Assignee: JOLED INC.
    Inventors: Shinya Ono, Shigeo Homura
  • Patent number: 9852687
    Abstract: A display device comprising pixel circuits arranged in a matrix, in which each of the pixel circuits includes: an EL element; a capacitor for storing voltage; a drive transistor that provides, to the EL element, a current corresponding to the voltage stored in the capacitor to cause the EL element to emit light; a voltage supplier that applies a reference voltage to the drive transistor in an initialization period, and applies a reverse bias voltage to the drive transistor in a predetermined period before the initialization period, the reference voltage being higher than a threshold voltage of the drive transistor and providing a forward bias between the gate and source electrodes of the drive transistor, the initialization period being a period for initializing the pixel circuit, the reverse bias voltage providing a reverse bias between the gate and source electrodes of the drive transistor.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: December 26, 2017
    Assignee: JOLED INC.
    Inventors: Hitoshi Tsuge, Kouhei Ebisuno, Shigeo Homura
  • Publication number: 20170294160
    Abstract: Provided is a method for driving a display device including: a display unit having a sub-pixel having a first light emitting element (organic EL element) and a first driving transistor for supplying a first electric current corresponding to a first gray level signal, and a sub-pixel having a second light emitting element (organic EL element) and a second driving transistor for supplying a second electric current corresponding to a second gray level signal; and a power supply unit configured to apply a power supply voltage to each sub-pixel via an electric current path that is common to the sub-pixel and the sub-pixel. The driving method includes correcting the first gray level signal based on the first gray level signal and the second gray level signal so as to compensate for a reduction in the first electric current caused by a voltage drop that occurs in the electric current path.
    Type: Application
    Filed: August 27, 2015
    Publication date: October 12, 2017
    Applicant: JOLED INC.
    Inventors: Shinya ONO, Shigeo HOMURA
  • Publication number: 20170243546
    Abstract: A method for driving a display device that includes a display unit and is driven by a sequence of row-by-row sequential scanning that includes a vertical blanking period, the display unit having pixels arranged in rows and columns, each pixel including an anode formed on a drive circuit layer, an organic light emitting layer formed above the anode and including a light emitting substance, and a transparent cathode formed above the organic light emitting layer, the method includes initializing a circuit element, writing a signal voltage to a capacitive element, inserting a black display to display the black display during a period determined based on a resistance value of the transparent cathode, and causing the organic EL element to emit light.
    Type: Application
    Filed: September 24, 2015
    Publication date: August 24, 2017
    Applicant: JOLED INC.
    Inventors: Shinya ONO, Shigeo HOMURA
  • Publication number: 20160210898
    Abstract: A display device comprising pixel circuits arranged in a matrix, in which each of the pixel circuits includes: an EL element; a capacitor for storing voltage; a drive transistor that provides, to the EL element, a current corresponding to the voltage stored in the capacitor to cause the EL element to emit light; a voltage supplier that applies a reference voltage to the drive transistor in an initialization period, and applies a reverse bias voltage to the drive transistor in a predetermined period before the initialization period, the reference voltage being higher than a threshold voltage of the drive transistor and providing a forward bias between the gate and source electrodes of the drive transistor, the initialization period being a period for initializing the pixel circuit, the reverse bias voltage providing a reverse bias between the gate and source electrodes of the drive transistor.
    Type: Application
    Filed: June 9, 2014
    Publication date: July 21, 2016
    Applicant: JOLED INC.
    Inventors: Hitoshi TSUGE, Kouhei EBISUNO, Shigeo HOMURA