Patents by Inventor Akihito Komazawa

Akihito Komazawa 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: 20240312408
    Abstract: A light emitting device including a pixel that includes a current path including a light emitting element and a driving transistor is provided. The pixel further includes a first switching transistor arranged between the path and a first power line, a second switching transistor arranged between the path and a second power line, and a write transistor to write a luminance signal in the gate. A potential of the first power line is lower than that of the second power line. One frame period includes a write period in which the write transistor is rendered conductive to write the luminance signal, and a light emission period. In the write period, the second switching transistor is rendered conductive while the write transistor is rendered conductive, and in the light emission period, the first switching transistor is rendered conductive.
    Type: Application
    Filed: March 6, 2024
    Publication date: September 19, 2024
    Inventor: AKIHITO KOMAZAWA
  • Patent number: 12039934
    Abstract: A light emitting device in which a pixel is arranged is provided. The pixel includes a light emitting element, a first transistor configured to supply, to the light emitting element, a current corresponding to a luminance signal, and a second transistor configured to supply the luminance signal to a gate electrode of the first transistor. Diffusion regions respectively functioning as a source region and a drain region of the second transistor are of a first conductivity type, and a gate electrode of the second transistor is of a second conductivity type opposite to the first conductivity type.
    Type: Grant
    Filed: April 12, 2023
    Date of Patent: July 16, 2024
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akihito Komazawa, Hiromasa Tsuboi
  • Patent number: 11842682
    Abstract: The light emitting device comprises: a plurality of pixels, each having a light-emitting element, a driving transistor configured to drive the light-emitting element, a capacitor configured to hold a threshold voltage of the driving transistor, a signal line, a first switch configured to connect the signal line and a control electrode of the driving transistor, and a second switch configured to connect a first main electrode of the driving transistor and a predetermined node; and a driving circuit configured to drive the signal line. In a preparation period in which the threshold voltage is held in the capacitor, the first switch is controlled to be on and the second switch is controlled to be off, and the driving circuit drives the signal line at a voltage level selected from a plurality of different voltage levels.
    Type: Grant
    Filed: January 12, 2022
    Date of Patent: December 12, 2023
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akihito Komazawa, Hiromasa Tsuboi
  • Publication number: 20230343292
    Abstract: A light emitting device in which a pixel is arranged is provided. The pixel includes a light emitting element, a first transistor configured to supply, to the light emitting element, a current corresponding to a luminance signal, and a second transistor configured to supply the luminance signal to a gate electrode of the first transistor. Diffusion regions respectively functioning as a source region and a drain region of the second transistor are of a first conductivity type, and a gate electrode of the second transistor is of a second conductivity type opposite to the first conductivity type.
    Type: Application
    Filed: April 12, 2023
    Publication date: October 26, 2023
    Inventors: Akihito Komazawa, Hiromasa Tsuboi
  • Publication number: 20220230585
    Abstract: The light emitting device comprises: a plurality of pixels, each having a light-emitting element, a driving transistor configured to drive the light-emitting element, a capacitor configured to hold a threshold voltage of the driving transistor, a signal line, a first switch configured to connect the signal line and a control electrode of the driving transistor, and a second switch configured to connect a first main electrode of the driving transistor and a predetermined node; and a driving circuit configured to drive the signal line. In a preparation period in which the threshold voltage is held in the capacitor, the first switch is controlled to be on and the second switch is controlled to be off, and the driving circuit drives the signal line at a voltage level selected from a plurality of different voltage levels.
    Type: Application
    Filed: January 12, 2022
    Publication date: July 21, 2022
    Inventors: Akihito Komazawa, Hiromasa Tsuboi