Patents by Inventor Takahiro Ushikubo

Takahiro Ushikubo 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: 20240040818
    Abstract: To provide a display device, in which deterioration in characteristics is small even when some of layers are exposed to a solvent or an atmosphere when photolithography is performed, and a method for manufacturing the display device. The display device having a pixel including a plurality of sub-pixels includes: a substrate; a lower electrode provided on an upper side of the substrate; an organic EL layer provided on the lower electrode and including an emission layer configured to emit a different color for each sub-pixel; and an upper electrode disposed on an upper side of the organic EL layer. An exposure protection layer having transparency and conductivity provided for each sub-pixel is formed between the organic EL layer and the upper electrode. No emission layer is formed between the exposure protection layer and the upper electrode.
    Type: Application
    Filed: July 24, 2023
    Publication date: February 1, 2024
    Inventors: Takahiro USHIKUBO, Hayata AOKI, Jun NITTA, Hiroumi KINJO
  • Patent number: 11889711
    Abstract: An object is to provide a light-emitting element capable of emitting light with a high luminance even at a low voltage, and having a long lifetime. The light-emitting element includes n EL layers between an anode and a cathode (n is a natural number of two or more), and also includes, between m-th EL layer from the anode and (m+1)-th EL layer (m is a natural number, 1?m?n?1), a first layer including a first donor material in contact with the m-th EL layer, a second layer including an electron-transport material and a second donor material in contact with the first layer, and a third layer including a hole-transport material and an acceptor material in contact with the second layer and the (m+1)-th EL layer.
    Type: Grant
    Filed: January 21, 2021
    Date of Patent: January 30, 2024
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Hiromi Nowatari, Satoshi Seo, Nobuharu Ohsawa, Takahiro Ushikubo, Tetsuo Tsutsui
  • Publication number: 20230389369
    Abstract: A display device includes a first pixel electrode, a second pixel electrode arranged in a first direction and spaced apart from the first pixel electrode, an insulating layer having a first opening exposing at least a portion of a top surface of the first pixel electrode and a second opening exposing at least a portion of a top surface of the second pixel electrode, a first common layer arranged on the first pixel electrode, the second pixel electrode, and the insulating layer, a first light-emitting layer arranged on the first common layer, and overlapping the first pixel electrode, a second light-emitting layer arranged on the first common layer, overlapping the second pixel electrode, and having a lower emission starting voltage than that of the first light-emitting layer, and a counter electrode arranged on the first light-emitting layer and the second light-emitting layer.
    Type: Application
    Filed: August 14, 2023
    Publication date: November 30, 2023
    Applicant: Japan Display Inc.
    Inventor: Takahiro USHIKUBO
  • Patent number: 11825674
    Abstract: A display device may include a plurality of pixel electrodes arranged in a matrix along a first direction and a second direction perpendicular to each other. A plurality of light-emitting layers overlap with the respective plurality of pixel electrodes. A plurality of carrier generation layers are separated from one another. Each of the plurality of carrier generation layers continuously overlap with two of the plurality of light-emitting layers. The two are next to each other in a direction oblique to both the first direction and the second direction. A common electrode is opposed to the plurality of pixel electrodes.
    Type: Grant
    Filed: February 8, 2021
    Date of Patent: November 21, 2023
    Assignee: Japan Display Inc.
    Inventor: Takahiro Ushikubo
  • Publication number: 20230371335
    Abstract: According to one embodiment, a display device includes a first emitting layer provided in each of first pixels, a second emitting layer provided in each of second pixels, a third emitting layer provided in each of third pixels and a color filter provided to oppose the third emitting layer, and a threshold of the third emitting layer is higher than a threshold of the first emitting layer and a threshold of the second emitting layer, and the color filter overlaps a boundary between each first emitting layer and a respective third emitting layer and a boundary between a second emitting layer and a respective third emitting layer.
    Type: Application
    Filed: May 10, 2023
    Publication date: November 16, 2023
    Applicant: Japan Display Inc.
    Inventors: Takahiro USHIKUBO, Hayata AOKI
  • Publication number: 20230345802
    Abstract: Provided is an organic EL display device and a method for manufacturing the same having the characteristics that are less deteriorated even if some layers are exposed to a solvent or the atmosphere when performing photolithography. An organic electroluminescence display device includes a plurality of pixel each including a plurality of sub-pixels, a substrate, a lower electrode, an organic EL layer including an emission layer that emits a different color for each sub-pixel, and an upper electrode disposed on an upper side of the organic EL layer. An exposure protective layer is disposed between the organic EL layer and the upper electrode, where the exposure protective layer includes a protective charge generation layer and a first protective hole transport layer that are laminated in this order for each sub-pixel, and the emission layer is not provided between the exposure protective layer and the upper electrode.
    Type: Application
    Filed: April 20, 2023
    Publication date: October 26, 2023
    Inventor: Takahiro USHIKUBO
  • Publication number: 20230301178
    Abstract: A triarylamine derivative represented by a general formula (G1) given below is provided. Note that in the formula, Ar represents either a substituted or unsubstituted phenyl group or a substituted or unsubstituted biphenyl group; ? represents a substituted or unsubstituted naphthyl group; ? represents either hydrogen or a substituted or unsubstituted naphthyl group; n and m each independently represent 1 or 2; and R1 to R8 each independently represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, or a phenyl group.
    Type: Application
    Filed: May 22, 2023
    Publication date: September 21, 2023
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Harue Osaka, Takahiro USHIKUBO, Nobuharu OHSAWA, Satoshi SEO, Tsunenori SUZUKI
  • Publication number: 20230209850
    Abstract: According to one embodiment, a display device includes an anode, an organic EL element layer including a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer, and a cathode, wherein ?E2_LUMO is defined as a potential barrier between the electron transport layer and the hole blocking layer, and the light-emitting layer, ?E2_HOMO is defined as a potential barrier between the hole transport layer and the electron blocking layer, and the light-emitting layer, and each of ?E2_LUMO and ?E2_HOMO is 0.1 eV or higher and 0.5 eV or less.
    Type: Application
    Filed: December 22, 2022
    Publication date: June 29, 2023
    Applicant: Japan Display Inc.
    Inventors: Nobuto MANAGAKI, Takuya NAKAGAWA, Ryosuke MURATA, Masakazu GUNJI, Takahiro USHIKUBO, Masashi TSUBUKU
  • Patent number: 11678568
    Abstract: A triarylamine derivative represented by a general formula (G1) given below is provided. Note that in the formula, Ar represents either a substituted or unsubstituted phenyl group or a substituted or unsubstituted biphenyl group; ? represents a substituted or unsubstituted naphthyl group; ? represents either hydrogen or a substituted or unsubstituted naphthyl group; n and m each independently represent 1 or 2; and R1 to R8 each independently represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, or a phenyl group.
    Type: Grant
    Filed: October 8, 2020
    Date of Patent: June 13, 2023
    Inventors: Harue Osaka, Takahiro Ushikubo, Nobuharu Ohsawa, Satoshi Seo, Tsunenori Suzuki
  • Publication number: 20230071734
    Abstract: A light-emitting element whose degree of deterioration with driving time is improved and of which emission colors are easily controlled. A light-emitting emitting element having a first electrode, a second electrode, and a layer containing an organic compound located between the first electrode and the second electrode, in which the layer containing the organic compound at least has, from the second electrode side, a light-emitting layer in which a first layer, a second layer, and a third layer are stacked, and a hole-transporting layer provided in contact with the third layer; the first layer contains a first organic compound and a second organic compound; the second layer contains a third organic compound and a fourth organic compound; and the third layer contains the first organic compound and a fifth organic compound.
    Type: Application
    Filed: September 28, 2022
    Publication date: March 9, 2023
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Takahiro Ushikubo
  • Publication number: 20220388958
    Abstract: To provide a light-emitting element having high luminous efficiency and to provide a light-emitting device and an electronic device which consumes low power and is driven at low voltage, a carbazole derivative represented by the general formula (1) is provided. In the formula, ?1, ?2, ?3, and ?4 each represent an arylene group having less than or equal to 13 carbon atoms; Ar1 and Ar2 each represent an aryl group having less than or equal to 13 carbon atoms; R1 represents any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group; and R2 represents any of an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group. In addition, l, m, and n are each independently 0 or 1.
    Type: Application
    Filed: July 11, 2022
    Publication date: December 8, 2022
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Hiroko NOMURA, Harue OSAKA, Takahiro USHIKUBO, Sachiko KAWAKAMI, Satoshi SEO, Satoko SHITAGAKI
  • Patent number: 11462704
    Abstract: A light-emitting element whose degree of deterioration with driving time is improved and of which emission colors are easily controlled. A light-emitting emitting element having a first electrode, a second electrode, and a layer containing an organic compound located between the first electrode and the second electrode, in which the layer containing the organic compound at least has, from the second electrode side, a light-emitting layer in which a first layer, a second layer, and a third layer are stacked, and a hole-transporting layer provided in contact with the third layer; the first layer contains a first organic compound and a second organic compound; the second layer contains a third organic compound and a fourth organic compound; and the third layer contains the first organic compound and a fifth organic compound.
    Type: Grant
    Filed: August 25, 2021
    Date of Patent: October 4, 2022
    Inventor: Takahiro Ushikubo
  • Patent number: 11424431
    Abstract: A display device includes a display region arranged above a substrate, a first light emitting element emitting light of a first color, a second light emitting element emitting light of a second color, and a third light emitting element emitting light of a third color arranged in the display region, and a first optical path length adjustment film, a second optical path length adjustment film, and a third optical path length adjustment film in the display region.
    Type: Grant
    Filed: December 31, 2020
    Date of Patent: August 23, 2022
    Assignee: Japan Display Inc.
    Inventor: Takahiro Ushikubo
  • Publication number: 20210384455
    Abstract: A light-emitting element whose degree of deterioration with driving time is improved and of which emission colors are easily controlled. A light-emitting emitting element having a first electrode, a second electrode, and a layer containing an organic compound located between the first electrode and the second electrode, in which the layer containing the organic compound at least has, from the second electrode side, a light-emitting layer in which a first layer, a second layer, and a third layer are stacked, and a hole-transporting layer provided in contact with the third layer; the first layer contains a first organic compound and a second organic compound; the second layer contains a third organic compound and a fourth organic compound; and the third layer contains the first organic compound and a fifth organic compound.
    Type: Application
    Filed: August 25, 2021
    Publication date: December 9, 2021
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Takahiro Ushikubo
  • Publication number: 20210296617
    Abstract: A technique of manufacturing a display device with high productivity is provided. In addition, a high-definition display device with high color purity is provided. By adjusting the optical path length between an electrode having a reflective property and a light-emitting layer by the central wavelength of a wavelength range of light passing through a color filter layer, the high-definition display device with high color purity is provided without performing selective deposition of light-emitting layers. In a light-emitting element, a plurality of light-emitting layers emitting light of different colors are stacked. The closer the light-emitting layer is positioned to the electrode having a reflective property, the shorter the wavelength of light emitted from the light-emitting layer is.
    Type: Application
    Filed: June 2, 2021
    Publication date: September 23, 2021
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Satoshi Seo, Toshiki Sasaki, Nobuharu Ohsawa, Takahiro Ushikubo, Shunpei Yamazaki
  • Patent number: 11108009
    Abstract: A light-emitting element whose degree of deterioration with driving time is improved and of which emission colors are easily controlled. A light-emitting emitting element having a first electrode, a second electrode, and a layer containing an organic compound located between the first electrode and the second electrode, in which the layer containing the organic compound at least has, from the second electrode side, a light-emitting layer in which a first layer, a second layer, and a third layer are stacked, and a hole-transporting layer provided in contact with the third layer; the first layer contains a first organic compound and a second organic compound; the second layer contains a third organic compound and a fourth organic compound; and the third layer contains the first organic compound and a fifth organic compound.
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: August 31, 2021
    Inventor: Takahiro Ushikubo
  • Patent number: 11031439
    Abstract: A technique of manufacturing a display device with high productivity is provided. In addition, a high-definition display device with high color purity is provided. By adjusting the optical path length between an electrode having a reflective property and a light-emitting layer by the central wavelength of a wavelength range of light passing through a color filter layer, the high-definition display device with high color purity is provided without performing selective deposition of light-emitting layers. In a light-emitting element, a plurality of light-emitting layers emitting light of different colors are stacked. The closer the light-emitting layer is positioned to the electrode having a reflective property, the shorter the wavelength of light emitted from the light-emitting layer is.
    Type: Grant
    Filed: October 22, 2019
    Date of Patent: June 8, 2021
    Inventors: Satoshi Seo, Toshiki Sasaki, Nobuharu Ohsawa, Takahiro Ushikubo, Shunpei Yamazaki
  • Publication number: 20210167314
    Abstract: A display device may include a plurality of pixel electrodes arranged in a matrix along a first direction and a second direction perpendicular to each other. A plurality of light-emitting layers overlap with the respective plurality of pixel electrodes. A plurality of carrier generation layers are separated from one another. Each of the plurality of carrier generation layers continuously overlap with two of the plurality of light-emitting layers. The two are next to each other in a direction oblique to both the first direction and the second direction. A common electrode is opposed to the plurality of pixel electrodes.
    Type: Application
    Filed: February 8, 2021
    Publication date: June 3, 2021
    Applicant: Japan Display Inc.
    Inventor: Takahiro USHIKUBO
  • Publication number: 20210143354
    Abstract: An object is to provide a light-emitting element capable of emitting light with a high luminance even at a low voltage, and having a long lifetime. The light-emitting element includes n EL layers between an anode and a cathode (n is a natural number of two or more), and also includes, between m-th EL layer from the anode and (m+1)-th EL layer (m is a natural number, 1?m?n?1), a first layer including a first donor material in contact with the m-th EL layer, a second layer including an electron-transport material and a second donor material in contact with the first layer, and a third layer including a hole-transport material and an acceptor material in contact with the second layer and the (m+1)-th EL layer.
    Type: Application
    Filed: January 21, 2021
    Publication date: May 13, 2021
    Inventors: Hiromi NOWATARI, Satoshi SEO, Nobuharu OHSAWA, Takahiro USHIKUBO, Tetsuo TSUTSUI
  • Publication number: 20210126226
    Abstract: A display device includes a display region arranged above a substrate, a first light emitting element emitting light of a first color, a second light emitting element emitting light of a second color, and a third light emitting element emitting light of a third color arranged in the display region, and a first optical path length adjustment film, a second optical path length adjustment film, and a third optical path length adjustment film in the display region.
    Type: Application
    Filed: December 31, 2020
    Publication date: April 29, 2021
    Inventor: Takahiro Ushikubo