Patents by Inventor Koji Ishizuya

Koji Ishizuya 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: 20190305050
    Abstract: A display device according to an embodiment of the present invention includes first and second electroluminescent elements on a substrate. The first and second electroluminescent elements each include a lower electrode, a functional layer including a light-emitting layer, an upper electrode, and a first or second color filter. The display device includes an overlapping region where the first and second color filters overlap each other in a plan view. Light transmitted through the first color filter has a higher luminosity factor than light transmitted through the second color filter. L2>L1, wherein L2 is the distance between the light-emitting region of the second electroluminescent element and the second color filter, and L1 is the distance between the light-emitting region of the first electroluminescent element and the first color filter.
    Type: Application
    Filed: March 29, 2019
    Publication date: October 3, 2019
    Inventors: Koji Ishizuya, Tetsuo Takahashi
  • Publication number: 20190305051
    Abstract: The present invention provides a light-emitting device including a substrate, a first EL element, and a second EL element, the first EL element and the second EL element each including a lower electrode, an organic compound layer including a light-emitting layer, an upper electrode, and a color filter in this order from the substrate, and an insulating layer that covers an end portion of the lower electrode. A first color filter of the first EL element and a second color filter of the second EL element overlap each other when viewed in plan in an overlapping region, and an inclined portion closest to the first EL element among inclined portions of the insulating layer of the second EL element and the overlapping region overlap each other when viewed in plan.
    Type: Application
    Filed: March 29, 2019
    Publication date: October 3, 2019
    Inventors: Tetsuo Takahashi, Koji Ishizuya, Norifumi Kajimoto, Hiroaki Sano, Akira Okita, Etsuro Kishi, Masaki Kurihara, Daisuke Shimoyama
  • Publication number: 20190305242
    Abstract: One embodiment of this invention has a first electrode, a first light emitting layer, and a second electrode, in which the first light emitting layer has a first host material and a first dopant material, a lowest triplet excitation energy of the first host material is higher than a lowest triplet excitation energy of the first dopant material, and, when a weight of the first light emitting layer is set to 100 wt %, a concentration of the first dopant material is 0.3 wt % or less.
    Type: Application
    Filed: March 28, 2019
    Publication date: October 3, 2019
    Inventors: Tetsuo Takahashi, Satoru Shiobara, Koichi Ishige, Tomona Yamaguchi, Koji Ishizuya, Takayuki Ito, Norifumi Kajimoto
  • Publication number: 20190123279
    Abstract: A light-emitting device includes a plurality of organic EL elements. Each of the organic EL elements includes a reflection electrode, a hole transport region, an electron-trapping luminescent layer, and a light extraction electrode in this order. The hole transport region has a sheet resistance of 4.0×107 ?/sq. or more at a current of 0.1 nA/pixel, and the total thickness of the hole transport region and the electron-trapping luminescent layer is equivalent to an optical path length enabling emission from the electron-trapping luminescent layer to be enhanced.
    Type: Application
    Filed: October 16, 2018
    Publication date: April 25, 2019
    Inventors: Norifumi Kajimoto, Tetsuo Takahashi, Koji Ishizuya, Itaru Takaya, Hirokazu Miyashita, Takayuki Ito, Hiroaki Sano
  • Publication number: 20160299454
    Abstract: A light emitter includes an elongated substrate and a plurality of emission elements on the substrate. The emission elements include a first electrode, an organic layer, and a second electrode in this order from the substrate side. The organic layer stretches over one of the emission elements and a next one in the longitudinal direction of the substrate. The light emitter further has a plurality of projections on the substrate. Each of the projections is adjacent to each of the emission elements in the transverse direction of the substrate. The emission elements are located between one of the projections and another. The projections are higher than the second electrode with respect to the principal surface of the substrate. The projections and the second electrode are spaced from each other.
    Type: Application
    Filed: April 4, 2016
    Publication date: October 13, 2016
    Inventors: Satoru Shiobara, Ryuji Ishii, Koji Ishizuya, Yojiro Matsuda
  • Publication number: 20150280175
    Abstract: This invention provides a method for manufacturing an organic light emitting element in which damages to members constituting the organic light emitting element are suppressed and a protective layer with few defects is formed by performing cleaning with liquid containing water. The manufacturing method according to this invention is a method for manufacturing an organic light emitting element including a process of preparing a lower electrode, a process of forming an organic compound layer on the lower electrode, a process of forming an upper electrode on the organic compound layer; and a process of forming a first protective layer on the upper electrode, in which the method includes, after the process of forming the organic compound layer, a process of cleaning at least one of the organic compound layer, the upper electrode, and the first protective layer with liquid containing water.
    Type: Application
    Filed: March 25, 2015
    Publication date: October 1, 2015
    Inventors: Takayuki Ito, Itaru Takaya, Seiji Mashimo, Koji Ishizuya, Jun Kamatani, Naoki Yamada, Tetsuya Kosuge, Hirokazu Miyashita
  • Patent number: 8963133
    Abstract: Provided is an organic electroluminescent element that achieves increased emission intensity in the front direction of the organic electroluminescent element without reducing the size of the light-emitting region thereof.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: February 24, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Koji Ishizuya
  • Patent number: 8916856
    Abstract: A display with organic electroluminescent elements each having an optical-interference structure includes; a blue-light emitting layer containing a host material and a light emitting material, where lowest unoccupied molecular orbital of a hole-transporting layer is smaller than that of the host material and highest occupied molecular orbital (HOMO) of the host material is larger than that of the hole-transporting layer by 0.5 eV or lower; and a film-thickness adjustment layer disposed between a light emitting layer and the hole-transporting layer of a red-light emitting electroluminescent element or a green-light emitting electroluminescent element, where the hole-mobility of the adjustment layer is higher than the carrier-mobility of the light emitting layer of the electroluminescent element having the adjustment layer, and HOMO of the adjustment layer is not higher than that of the hole-transporting layer and not lower than that of the light emitting material in the light emitting layer thereof.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: December 23, 2014
    Assignee: Canon Kabushiki Kashia
    Inventor: Koji Ishizuya
  • Patent number: 8648527
    Abstract: Provided is a display apparatus using an organic EL device in which blur in a display image to be a problem for the display apparatus is reduced while propagating light propagating through a high-refractive-index transparent layer is efficiently extracted outside. The display apparatus has a configuration in which a high-refractive-index transparent layer is provided on a light exit side of the organic EL device, a light extraction structure is provided on the high-refractive-index transparent layer so as to surround each of subpixels, a visible light absorbing member is arranged between pixels adjacent to each other, and the visible light absorbing member is not arranged in a region between subpixels adjacent to each other within a pixel.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: February 11, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoru Shiobara, Takayuki Sumida, Koji Ishizuya
  • Patent number: 8530908
    Abstract: An organic EL element includes: an organic EL layer including a transparent electrode, a reflective electrode, and a light-emitting layer; a transparent layer disposed on a light-exiting side of the transparent electrode; and a light extraction structure disposed on a light-exiting side of the transparent layer and having a protruding shape with inclined portions. The transparent layer and the light extraction structure have a larger refractive index than the light-emitting layer. The inclined portions of the light extraction structure satisfy Condition 1 or 2 for extracting guided wave light emitted from the light-emitting layer and incident on the light extraction structure from the light extraction structure to the outside of the organic EL element, in a cross section taken along a plane perpendicular to the reflective electrode, where two inclination angles ?1 and ?2 formed between the reflective electrode and the inclined portions are the largest.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: September 10, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Koji Ishizuya
  • Publication number: 20130082909
    Abstract: A display apparatus includes a plurality of subpixels having different emission colors in a pixel, and each of the subpixels includes an organic EL device. A high-refractive-index transparent layer having a refractive index higher than that of an organic compound layer of the organic EL device is provided on a light exit side of the organic EL device, and further, a light extraction structure is arranged on an outer circumference of the subpixel on the light exit side of the high-refractive-index transparent layer. A distance between first electrodes of the subpixels closest to each other, which are respectively included in the two adjacent pixels, is set to be larger than that between the first electrodes of the two adjacent subpixels within the pixel.
    Type: Application
    Filed: August 31, 2012
    Publication date: April 4, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Seishi Miura, Koji Ishizuya
  • Publication number: 20130076236
    Abstract: Provided is a display apparatus including an organic EL device in which blur in a displayed image to be a problem for the display apparatus is reduced. The display apparatus includes a plurality of subpixels for emitting light having different emission colors in a pixel, and each of the plurality of subpixels includes an organic EL device. A transparent layer having a refractive index higher than that of an organic compound layer of the organic EL device is provided on the organic EL device, and further, a light extraction structure surrounding each of the subpixels is provided on the transparent layer. A distance between the subpixels closest to each other included in two adjacent pixels is set to be at least a sum of waveguide lengths of light emitted from the respective subpixels.
    Type: Application
    Filed: September 5, 2012
    Publication date: March 28, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takayuki Sumida, Satoru Shiobara, Koji Ishizuya
  • Publication number: 20130069046
    Abstract: Provided is an organic electroluminescent element that achieves increased emission intensity in the front direction of the organic electroluminescent element without reducing the size of the light-emitting region thereof.
    Type: Application
    Filed: August 21, 2012
    Publication date: March 21, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Koji Ishizuya
  • Publication number: 20120286294
    Abstract: An organic EL element includes: an organic EL layer including a transparent electrode, a reflective electrode, and a light-emitting layer; a transparent layer disposed on a light-exiting side of the transparent electrode; and a light extraction structure disposed on a light-exiting side of the transparent layer and having a protruding shape with inclined portions. The transparent layer and the light extraction structure have a larger refractive index than the light-emitting layer. The inclined portions of the light extraction structure satisfy Condition 1 or 2 for extracting guided wave light emitted from the light-emitting layer and incident on the light extraction structure from the light extraction structure to the outside of the organic EL element, in a cross section taken along a plane perpendicular to the reflective electrode, where two inclination angles ?1 and ?2 formed between the reflective electrode and the inclined portions are the largest.
    Type: Application
    Filed: April 27, 2012
    Publication date: November 15, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Koji Ishizuya