Patents by Inventor Tokiyoshi Umeda

Tokiyoshi Umeda 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: 12185561
    Abstract: A display device includes a plurality of sub-pixels. The sub-pixels include, in common, a common hole-transport layer disposed between an anode and a light-emitting layer. Each sub-pixel individually includes an individual hole-transport layer disposed between the common hole-transport layer and the light-emitting layer. The common hole-transport layer is made of a first hole-transport-layer material. A sub-pixel has a first color and includes a first individual hole-transport layer made of a second hole-transport-layer material. A sub-pixel has a second color and includes a second individual hole-transport layer made of a mixed material of the first and second hole-transport-layer materials.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: December 31, 2024
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yuto Tsukamoto, Tokiyoshi Umeda, Hiroshi Tsuchiya
  • Patent number: 12114554
    Abstract: The light-emitting device includes a light-emitting element in which a first electrode, a light-emitting layer, and a second electrode are sequentially layered toward a side of a light-emitting face. Further, the light-emitting device includes, on a side of the light-emitting face of the second electrode, a complementary color light absorption layer configured to absorb complementary color light of light emitted by the light-emitting element.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: October 8, 2024
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tokiyoshi Umeda, Yuto Tsukamoto, Bai Zhang, Shinichi Kawato
  • Publication number: 20240292702
    Abstract: A display device has a display area including a first pixel region, a second pixel region, and a third pixel region. The display device includes: a first electrode; a first photoelectric conversion layer including a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer; a first electric charge injection layer; a second electric charge injection layer; a second photoelectric conversion layer including a fourth light-emitting layer; and a second electrode. The first light-emitting layer is provided in the first pixel region. The second light-emitting layer is provided in the second pixel region. The third light-emitting layer is provided in the third pixel region. The first electric charge injection layer is provided across the entire display area. The second electric charge injection layer is provided only in the third pixel region. The fourth light-emitting layer is provided at least in the third pixel region.
    Type: Application
    Filed: August 2, 2021
    Publication date: August 29, 2024
    Inventors: Yuto TSUKAMOTO, Shinichi KAWATO, Tokiyoshi UMEDA, Tohru SONODA
  • Patent number: 12035564
    Abstract: A TFT layer; a light-emitting element layer including a first electrode, a light-emitting layer, and a second electrode; a wavelength conversion layer formed above the light-emitting element layer and being configured to convert a color of light from the light-emitting layer; a dielectric layer formed above the wavelength conversion layer; and a particle layer formed above the dielectric layer and including metal nanoparticles including a core and a shell around the core.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: July 9, 2024
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Koji Murata, Tokiyoshi Umeda, Yuto Tsukamoto
  • Patent number: 12021175
    Abstract: A display device includes a light-emitting layer and a red converting layer, the red converting layer includes a binder resin, red luminescent bodies, and In nanoparticles, each of the In nanoparticles includes a core and a silica shell, and the silica shell includes blue luminescent bodies emitting light having a wavelength shorter than that of red luminescent bodies.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: June 25, 2024
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Koji Murata, Tokiyoshi Umeda, Yuto Tsukamoto
  • Publication number: 20240008357
    Abstract: A light-emitting element includes a first electrode, a second electrode, a light-emitting layer provided between the first electrode and the second electrode and including a material having a perovskite structure, and a blocking layer provided in at least one of a position between the first electrode and the light-emitting layer or a position between the second electrode and the light-emitting layer, and configured to suppress migration of charges from the light-emitting layer.
    Type: Application
    Filed: November 12, 2020
    Publication date: January 4, 2024
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: MANABU NIBOSHI, YUTO TSUKAMOTO, TOKIYOSHI UMEDA
  • Patent number: 11805663
    Abstract: A light-emitting device or the like with high color reproducibility and high luminous efficiency is achieved. The light-emitting device includes a blue pixel, a green pixel, and a red pixel, and the green pixel includes, in a green-light-emitting layer that emits light, a host material that transports carriers, a fluorescence dopant, which serves as a light emission dopant that contribute to light emission, and a thermally activated assist dopant which is composed of a thermally activated delayed fluorescent material.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: October 31, 2023
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tokiyoshi Umeda, Yuto Tsukamoto, Bai Zhang, Shinichi Kawato
  • Publication number: 20230309334
    Abstract: A display device includes a hole transport layer common to a plurality of light-emitting elements between a light-emitting layer and an anode electrode below thereof in the light-emitting element in each pixel. The hole transport layer includes a hole transport section that transports positive holes to the light-emitting layer, and an adjacent pixel hole blocking section that is formed in a portion between the light-emitting elements in adjacent pixels and blocks transportation of positive holes between the light-emitting elements in adjacent pixels.
    Type: Application
    Filed: August 19, 2020
    Publication date: September 28, 2023
    Inventors: BAI ZHANG, Koji YASUKAWA, TOKIYOSHI UMEDA, Naoki UETAKE
  • Publication number: 20230057758
    Abstract: A display device includes a light-emitting element layer including light-emitting elements in a plurality of kinds each emitting a light in a different color. A first electrode of the light-emitting elements includes a plurality of reflective layers including one RM and one TE stacked on the RM. The plurality of the reflective layers are stacked so that the RM and the TE are alternatively arranged in the stated order.
    Type: Application
    Filed: February 7, 2020
    Publication date: February 23, 2023
    Applicants: SHARP KABUSHIKI KAISHA, SHARP KABUSHIKI KAISHA
    Inventors: MANABU NIBOSHI, TOKIYOSHI UMEDA, YUTO TSUKAMOTO
  • Patent number: 11502266
    Abstract: Alight-emitting element includes an anode electrode, a cathode electrode, a light-emitting layer, a positive hole transport layer, and an electron transport layer. The light-emitting layer, the positive hole transport layer, and the electron transport layer are provided between the anode electrode and the cathode electrode. The light-emitting layer includes QD phosphor particles, a positive hole transport substance configured to transport positive holes transported thereto by the positive hole transport layer, an electron transport substance configured to transport electrons transported thereto by the electron transport layer, and a photosensitive host material.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: November 15, 2022
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tokiyoshi Umeda, Yuto Tsukamoto, Masayuki Kanehiro, Youhei Nakanishi
  • Publication number: 20220158045
    Abstract: A display device includes a light-emitting layer and a red converting layer, the red converting layer includes a binder resin, red luminescent bodies, and In nanoparticles, each of the In nanoparticles includes a core and a silica shell, and the silica shell includes blue luminescent bodies emitting light having a wavelength shorter than that of red luminescent bodies.
    Type: Application
    Filed: March 22, 2019
    Publication date: May 19, 2022
    Inventors: KOJI MURATA, TOKIYOSHI UMEDA, YUTO TSUKAMOTO
  • Publication number: 20220045303
    Abstract: A TFT layer; a light-emitting element layer including a first electrode, a light-emitting layer, and a second electrode; a wavelength conversion layer formed above the light-emitting element layer and being configured to convert a color of light from the light-emitting layer; a dielectric layer formed above the wavelength conversion layer; and a particle layer formed above the dielectric layer and including metal nanoparticles including a core and a shell around the core.
    Type: Application
    Filed: March 11, 2019
    Publication date: February 10, 2022
    Inventors: KOJI MURATA, TOKIYOSHI UMEDA, YUTO TSUKAMOTO
  • Patent number: 11217763
    Abstract: To provide a light-emitting device that can obtain fluorescence having a narrow spectrum more efficiently, a light-emitting device includes: a light-emitting layer in which thermally activated delayed fluorescence bodies and quantum dots are dispersed; a first electrode in a lower layer than the light-emitting layer; and a second electrode in an upper layer than the light-emitting layer, wherein a light emission spectrum of the thermally activated delayed fluorescence bodies and an absorption spectrum of the quantum dots at least partially overlap each other.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: January 4, 2022
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yuto Tsukamoto, Shinichi Kawato, Tokiyoshi Umeda, Manabu Niboshi, Youhei Nakanishi, Hisayuki Utsumi, Masayuki Kanehiro, Shota Okamoto
  • Publication number: 20210328198
    Abstract: The light-emitting device includes a light-emitting element in which a first electrode, a light-emitting layer, and a second electrode are sequentially layered toward a light-emitting face side. The plurality of light-emitting elements include a first light-emitting element configured to emit light of a first color, a second light-emitting element configured to emit light of a second color different from the first color, and a third light-emitting element configured to emit light of a third color different from the first color and the second color. The light-emitting device includes a light absorption layer on the light-emitting face side of the second electrode, in plane view, in common at positions where the light absorption layer is superimposed on the plurality of light-emitting elements, and the light absorption layer absorbs the light of the first color, the light of the second color, and the light of the third color.
    Type: Application
    Filed: September 11, 2018
    Publication date: October 21, 2021
    Inventors: TOKIYOSHI UMEDA, YUTO TSUKAMOTO, BAI ZHANG, SHINICHI KAWATO
  • Publication number: 20210320151
    Abstract: The light-emitting device includes a light-emitting element in which a first electrode, a light-emitting layer, and a second electrode are sequentially layered toward a side of a light-emitting face. Further, the light-emitting device includes, on a side of the light-emitting face of the second electrode, a complementary color light absorption layer configured to absorb complementary color light of light emitted by the light-emitting element.
    Type: Application
    Filed: September 11, 2018
    Publication date: October 14, 2021
    Inventors: TOKIYOSHI UMEDA, YUTO TSUKAMOTO, BAI ZHANG, SHINICHI KAWATO
  • Publication number: 20210305533
    Abstract: A display device includes a plurality of sub-pixels. The sub-pixels include, in common, a common hole-transport layer disposed between an anode and a light-emitting layer. Each sub-pixel individually includes an individual hole-transport layer disposed between the common hole-transport layer and the light-emitting layer. The common hole-transport layer is made of a first hole-transport-layer material. A sub-pixel has a first color and includes a first individual hole-transport layer made of a second hole-transport-layer material. A sub-pixel has a second color and includes a second individual hole-transport layer made of a mixed material of the first and second hole-transport-layer materials.
    Type: Application
    Filed: July 19, 2018
    Publication date: September 30, 2021
    Inventors: YUTO TSUKAMOTO, TOKIYOSHI UMEDA, HIROSHI TSUCHIYA
  • Publication number: 20210135137
    Abstract: To provide a light-emitting device that easily generates energy transition to fluorescent materials having a peak of the light emission spectrum in the deep-blue region and has improved efficiency of light emission, provided is a light-emitting device including a light-emitting layer in which quantum dots and light emitters being phosphors or phosphorescent members are dispersed, a first electrode in a lower layer than the light-emitting layer, and a second electrode in an upper layer than the light-emitting layer, wherein a light emission spectrum of the quantum dots and an absorption spectrum of the light emitters at least partially overlap each other.
    Type: Application
    Filed: September 5, 2017
    Publication date: May 6, 2021
    Inventors: YUTO TSUKAMOTO, SHINICHI KAWATO, TOKIYOSHI UMEDA, MANABU NIBOSHI, YOUHEI NAKANISHI, HISAYUKI UTSUMI, MASAYUKI KANEHIRO, SHOTA OKAMOTO
  • Patent number: 10998529
    Abstract: A display device, to provide compensation for change in color level due to different viewing directions of a display surface and compensation for other optical characteristics of the display surface in a compatible manner, includes a light-emitting element layer including a light-emitting layer including a light-emitting element, a first electrode disposed below the light-emitting layer, and a second electrode disposed above the light-emitting layer, wherein an optical compensation layer is disposed above the light-emitting element layer, the optical compensation layer being configured to compensate for prevention of external light reflection on a display surface and compensate for change in color level of the display surface due to different viewing directions of the display surface.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: May 4, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Hidefumi Yoshida, Kiyoshi Minoura, Tokiyoshi Umeda, Kaoru Abe, Akira Sakai
  • Publication number: 20210126216
    Abstract: Alight-emitting element includes an anode electrode, a cathode electrode, a light-emitting layer, a positive hole transport layer, and an electron transport layer. The light-emitting layer, the positive hole transport layer, and the electron transport layer are provided between the anode electrode and the cathode electrode. The light-emitting layer includes QD phosphor particles, a positive hole transport substance configured to transport positive holes transported thereto by the positive hole transport layer, an electron transport substance configured to transport electrons transported thereto by the electron transport layer, and a photosensitive host material.
    Type: Application
    Filed: March 28, 2018
    Publication date: April 29, 2021
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Tokiyoshi UMEDA, Yuto TSUKAMOTO, Masayuki KANEHIRO, Youhei NAKANISHI
  • Patent number: 10991781
    Abstract: An organic EL display device includes a light modulating unit layer, a TFT layer, and a plurality of organic EL elements layered in the stated order. A top-emitting single-sided display emitting light emitted from a light emitting layer from an upper electrode side and a double-sided display emitting light emitted from the light emitting layer from each of the upper electrode side and a lower electrode side are electrically switched.
    Type: Grant
    Filed: May 29, 2017
    Date of Patent: April 27, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yuto Tsukamoto, Shinichi Kawato, Manabu Niboshi, Hiroshi Imada, Tokiyoshi Umeda, Bai Zhang, Tomoaki Jo