Patents by Inventor Hirofumi Kubota

Hirofumi Kubota 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: 7402939
    Abstract: An organic EL display includes an insulating layer with light-transmission property, an organic EL element located on a back side of the insulating layer, a diffraction grating located on the back side of the insulating layer, and an optical film disposed on a front side of the insulating layer and including optically isotropic first portions and optically anisotropic second portions, the first and second portions forming boundaries inclined with respect to a main surface of the optical film.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: July 22, 2008
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Hirofumi Kubota, Satoshi Okutani, Tsuyoshi Uemura
  • Patent number: 7375463
    Abstract: An optical device includes a first waveguide layer in which multiple-beam interference occurs, a second wavelength layer which includes a back surface facing the first waveguide layer and a front surface as a light output surface, and an outcoupling layer which is disposed on a back side of the second waveguide layer and faces the first wave guide layer, wherein the outcoupling layer includes a first portion as a layer with light transmission property and second portions which are dispersed in the first portion and differ in optical property from the first portion, and wherein an array of the second portions forms a triangular lattice.
    Type: Grant
    Filed: November 9, 2005
    Date of Patent: May 20, 2008
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Tsuyoshi Uemura, Satoshi Okutani, Hirofumi Kubota, Muneharu Akiyoshi, Naotada Okada, Junichi Tonotani
  • Patent number: 7345420
    Abstract: An organic electroluminescent display panel includes one or more organic electroluminescent elements and a substrate supporting them. Each organic electroluminescent element has first and second display electrodes and one or more organic functional layers of organic compounds sandwiched and layered between the first and second display electrodes, the organic functional layers including a light-emitting layer. Such display panel has a high-molecular compound film covering the organic electroluminescent elements and a surface of the substrate around the one or more organic electroluminescent elements; and an inorganic barrier film covering the high-molecular compound film, an edge thereof, and a surface of the substrate around the high-molecular compound film.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: March 18, 2008
    Assignee: Pioneer Corporation
    Inventor: Hirofumi Kubota
  • Publication number: 20080022678
    Abstract: A control system for a supercharged internal combustion engine provided with a main exhaust passage (20) extending through a turbocharger turbine (21) and further through a catalyst (23, 24) to open to the outside air, an exhaust bypass passage (25) by passing the turbocharger turbine by branching from the main exhaust passage at the upstream side of the turbine and merging with the main exhaust passage before reaching the catalyst at the turbine downstream side, and an exhaust bypass valve (26) provided at the exhaust bypass passage, the control system for a supercharged internal combustion engine controlling the ignition timing in accordance with at least one of the engine warmup state and the catalyst warmup state until warmup of the internal combustion engine and warmup of the catalyst are completed and further controlling the opening degree of the exhaust bypass valve based on the control of the ignition timing, is provided.
    Type: Application
    Filed: May 19, 2006
    Publication date: January 31, 2008
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION
    Inventors: Yasuyuki Irisawa, Hirofumi Kubota, Toshihiko Tanaka
  • Publication number: 20070290607
    Abstract: Disclosed is an organic electroluminescent display device, comprising a light-transmitting insulating layer, an organic electroluminescent element including a back side electrode arranged on the back side of the light transmitting insulating layer, a light-transmitting front side electrode interposed between the light-transmitting insulating layer and the back side electrode, and an organic material layer interposed between the front side electrode and the back side electrode and containing a light-emitting layer, and a three-dimensional diffraction element of a two-layer structure arranged on the optical path guiding the light emitted from the light-emitting layer included in the organic material layer to reach the light-transmitting insulating layer, wherein the three-dimensional diffraction element has a cross-sectional structure of a specified dielectric modulation.
    Type: Application
    Filed: March 29, 2007
    Publication date: December 20, 2007
    Inventors: Naotada OKADA, Junichi Tonotani, Satoshi Okutani, Hiroshi Sano, Tsuyoshi Uemura, Muneharu Akiyoshi, Hirofumi Kubota
  • Patent number: 7297038
    Abstract: A method for manufacturing an organic electro luminescence panel by forming a first electrode layer on a substrate; then forming a second electrode layer on the substrate; then forming a passivation layer on the substrate to cover the organic material layer and the second electrode layer; and then radiating either electron beams or ultraviolet rays onto locations other than the previously mentioned light-emitting portion of the organic layer.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: November 20, 2007
    Assignee: Pioneer Corporation
    Inventor: Hirofumi Kubota
  • Publication number: 20070126353
    Abstract: A display includes a light-emitting element which includes a back electrode, a front electrode facing the back electrode, and an active layer interposed therebetween and including an emitting layer, and a light-scattering layer which is placed on a front side of the front electrode. The light-emitting element forms at least a portion of a microcavity structure. A forward-scattered light is greater in luminous energy than a back-scattered light when the light-scattering layer is irradiated with light from the microcavity structure.
    Type: Application
    Filed: February 5, 2007
    Publication date: June 7, 2007
    Inventors: Hirofumi Kubota, Satoshi Okutani, Tsuyoshi Uemura
  • Publication number: 20070120474
    Abstract: An organic EL display includes a substrate, and organic EL elements arranged on the substrate. Each organic EL element includes an anode, a cathode, an emitting layer made of an organic material and interposed therebetween, and a hole transporting layer made of an organic material and interposed between the emitting layer and the anode. The hole transporting layer includes a first layer and a second layer facing the substrate with the first layer interposed therebetween. The second layer is equal in compositions with the first layer and different in degrees of crystallinity from the first layer.
    Type: Application
    Filed: November 22, 2006
    Publication date: May 31, 2007
    Inventors: Hirofumi Kubota, Norihisa Maeda, Masuyuki Oota, Kenji Mitsui
  • Publication number: 20070120464
    Abstract: A display includes an insulating substrate, a sealing member facing the insulating substrate, pixels interposed between the insulating substrate and the sealing member and each including a microcavity structure, wherein the microcavity structure includes a reflecting layer, a half mirror layer facing the reflecting layer, and a light source interposed between the reflecting layer and the half mirror layer, and a diffusion layer facing the half mirror layer.
    Type: Application
    Filed: February 1, 2007
    Publication date: May 31, 2007
    Inventors: Satoshi Okutani, Tsuyoshi Uemura, Hirofumi Kubota
  • Patent number: 7215393
    Abstract: A reflective plate comprises a substrate, a plurality of protrusions each formed on the substrate and having a curved surface, and a reflective film formed on the substrate having the protrusions, wherein a planar shape of each of the protrusions is indefinite, and when a frame line of the planar shape of each of the protrusions is divided into fine line segments, the line segments are pointed in all directions or in predetermined directions. This improves reflective properties such as dispersion properties.
    Type: Grant
    Filed: July 30, 2001
    Date of Patent: May 8, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mariko Kawaguri, Seiji Nishiyama, Naohide Wakita, Taketoshi Nakao, Yasuhiko Yamanaka, Toshiyasu Oue, Hirofumi Kubota
  • Publication number: 20070085477
    Abstract: A barrier thin film having a sufficient flexibility while providing the excellent barrier property without suffering from a pin hole or the like, and furthermore, without the risk of damaging the substance to be covered with the barrier is provided. The barrier thin film is provided as a single thin film while a property thereof is changed continuously from one side surface to the other side surface instead of having a homogeneous property.
    Type: Application
    Filed: November 9, 2004
    Publication date: April 19, 2007
    Inventor: Hirofumi Kubota
  • Publication number: 20070013282
    Abstract: An organic EL display includes an organic EL element including a pair of electrodes and an emitting layer interposed therebetween and having an optical resonator structure, and a coloring layer facing the organic EL element. A wavelength ?res of a light component with the maximum intensity that the organic EL element emits in a normal direction is shorter than a wavelength at which the coloring layer exhibits the maximum transmittance.
    Type: Application
    Filed: July 10, 2006
    Publication date: January 18, 2007
    Inventors: Satoshi Okutani, Hirofumi Kubota, Tsuyoshi Uemura
  • Publication number: 20060275540
    Abstract: An organic electroluminescence display panel has an enhanced shielding capability whereby degradation of light emission characteristics does not readily occur. This display panel includes one or more organic electroluminescence elements, and each organic electroluminescence element includes first and second display electrodes and one or more organic functional layers. The organic functional layer(s) is interposed between the first and second display electrodes. The organic functional layer includes an organic compound. The display panel also includes a substrate for supporting the organic electroluminescence element(s). The display panel further includes a high molecular compound film consisting of polyurea or polyimide that covers the organic electroluminescence element and the peripheral substrate surface. The display panel also includes an inorganic barrier film that covers the high molecular compound film, the edge face thereof, and the peripheral substrate surface.
    Type: Application
    Filed: August 4, 2006
    Publication date: December 7, 2006
    Inventor: Hirofumi Kubota
  • Publication number: 20060270213
    Abstract: An organic electroluminescent display panel includes: one or more organic electroluminescent elements each having first and second display electrodes and one or more organic functional layers of organic compounds sandwiched and layered between the first and second display electrodes, the organic functional layers including a light-emitting layer; and a substrate supporting the organic electroluminescent elements. The display panel also includes: a first inorganic barrier film covering the organic electroluminescent elements and a surface of the substrate around the one or more organic electroluminescent elements; a first high-molecular compound film having an area larger than each of the organic electroluminescent elements so as to partially cover the first inorganic barrier film thereover; and a second inorganic barrier film covering the first high-molecular compound film and an edge thereof.
    Type: Application
    Filed: August 4, 2006
    Publication date: November 30, 2006
    Inventor: Hirofumi Kubota
  • Patent number: 7142259
    Abstract: Before starting the regular display in a liquid crystal display device of the bend alignment type, it is necessary to transition all the pixel regions in the entire display portion uniformly from splay alignment into bend alignment. However, conventionally, when applying a simple ac voltage, the transition sometimes does not take place, and when it does take place, the transition time is very long, and display defects due to alignment defects tend to occur. In the method for driving a liquid crystal display device with OCB cells according to the present invention, a step of applying between an electrode 22 and a pixel electrode 23 an ac voltage superimposed with a bias voltage, and a step of applying zero voltage or a low voltage to the substrates are repeated in alternation preceding the begin of the regular display operation and the regular display operation is carried out after all pixels have transitioned into bend alignment.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: November 28, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuji Hattori, Shoichi Ishihara, Hirofumi Kubota, Shin-ichiro Hatta, Katsumi Adachi, Yoshinori Tanaka
  • Patent number: 7102176
    Abstract: An organic electroluminescent display panel includes: one or more organic electroluminescent elements each having first and second display electrodes and one or more organic functional layers of organic compounds sandwiched and layered between the first and second display electrodes, the organic functional layers including a light-emitting layer; and a substrate supporting the organic electroluminescent elements. The display panel also includes: a first inorganic barrier film covering the organic electroluminescent elements and a surface of the substrate around the one or more organic electroluminescent elements; a first high-molecular compound film having an area larger than each of the organic electroluminescent elements so as to partially cover the first inorganic barrier film thereover; and a second inorganic barrier film covering the first high-molecular compound film and an edge thereof.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: September 5, 2006
    Assignee: Pioneer Corporation
    Inventor: Hirofumi Kubota
  • Publication number: 20060094321
    Abstract: A method of manufacturing an organic EL element includes applying a reverse bias to an organic EL element with an inverse layered structure until a current density of the organic EL element at an impressed voltage of 10 V reaches 0.075 mA/cm2 or more.
    Type: Application
    Filed: November 2, 2005
    Publication date: May 4, 2006
    Inventors: Norihisa Maeda, Hirofumi Kubota, Hideyuki Murata
  • Publication number: 20060065904
    Abstract: A display includes pixels each of which contains a light emitting element and which are arranged in a matrix form, a light transmitting insulating layer which includes a back surface facing the light emitting element and a front surface as a light output surface, a beam-condensing element which is arranged on a back side of the insulating layer and increases a directivity of light emitted by the light emitting element to make the light incident on the insulating layer, and a diffusing element which is arranged on a front side of the insulating layer, diffuses light from the insulating layer, and output the diffused light to an external environment.
    Type: Application
    Filed: November 10, 2005
    Publication date: March 30, 2006
    Inventors: Tsuyoshi Uemura, Satoshi Okutani, Hirofumi Kubota, Naotada Okada, Junichi Tonotani
  • Publication number: 20060066230
    Abstract: An organic EL display includes an insulating layer with light-transmission property, an organic EL element located on a back side of the insulating layer, a diffraction grating located on the back side of the insulating layer, and an optical film disposed on a front side of the insulating layer and including optically isotropic first portions and optically anisotropic second portions, the first and second portions forming boundaries inclined with respect to a main surface of the optical film.
    Type: Application
    Filed: September 26, 2005
    Publication date: March 30, 2006
    Inventors: Hirofumi Kubota, Satoshi Okutani, Tsuyoshi Uemura
  • Publication number: 20060062270
    Abstract: An optical device includes a first waveguide layer in which multiple-beam interference occurs, a second waveguide layer which includes a back surface facing the first waveguide layer and a front surface as a light output surface, and a diffraction grating which is arranged on a back side of the second waveguide layer and faces the first waveguide layer, wherein a grating constant of the diffraction grating is defined such that a first-order diffracted light emerges from the second waveguide layer, the first-order diffracted light being generated when a light component having a highest intensity of light which propagates in an in-plane direction while causing multiple reflection in the first waveguide layer enters the diffraction grating.
    Type: Application
    Filed: November 10, 2005
    Publication date: March 23, 2006
    Inventors: Satoshi Okutani, Tsuyoshi Uemura, Hirofumi Kubota, Naotada Okada, Junichi Tonotani, Keiji Suzuki, Hideki Ookawa