Patents by Inventor Toshinao Yuki

Toshinao Yuki 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: 7195826
    Abstract: The new organic electroluminescent display device has a carrier-transporting layer and/or an organic luminous layer composed of a nematic liquid crystal or a liquid crystal dispersing a carrier-transporting low-molecule therein. When the organic luminous layer is to be bestowed with faculty as a liquid crystal, it is made of a nematic liquid crystal. Both the carrier-transporting layer and the organic luminous layer may be bestowed with faculty as a liquid crystal. Since the liquid crystal is incorporated in the carrier-transporting layer and/or the organic luminous layer, the display device can be driven as a liquid crystal display device in a dark place by charging with a voltage lower than a light emission initiating potential. Of course, it is driven as an electroluminescent display device when it is charged with a voltage higher than the light emission initiating potential. Use of an electroluminescent liquid crystal as a organic luminous layer enables omission of a carrier-transporting layer.
    Type: Grant
    Filed: August 28, 2003
    Date of Patent: March 27, 2007
    Assignees: Tohoku Pioneer Corporation
    Inventors: Junji Kido, Hitoshi Nakada, Teruo Tohma, Ryuji Murayama, Toshinao Yuki
  • Publication number: 20070018150
    Abstract: A self-emission panel and a method of manufacturing a self-emission panel which can prevent emission failures from occurring due to various factors, thereby achieving a self-emission panel that is free from emission failures. The self-emission panel is manufactured by forming a first conductive layer on a substrate directly or via other layers, forming a deposition layer including a luminescent layer on the first conductive layer, and forming a second conductive layer on the deposition layer. This manufacturing method includes: a first step of forming a sectioning layer for. sectioning an opening for making a emission area on the first conductive layer after the formation of the first conductive layer; a second step of applying surface treatment to at least the surface of the first conductive layer inside the opening; and a third step of depositing a deposition layer on the first conductive layer given surface treatment in the second step.
    Type: Application
    Filed: July 13, 2006
    Publication date: January 25, 2007
    Inventors: Shinji Nakajima, Yusuke Nakajima, Toshinao Yuki
  • Patent number: 7038372
    Abstract: A first electrode is formed above a substrate, organic material layers are stacked above the first electrode, and a second electrode is formed above the organic material layers. Among the organic material layers, at least two organic material layers having interfaces which electrons or holes traverse are formed by layers which are heat-treated at a temperature that is equal to or higher than the glass transition points of materials respectively constituting the organic material layers and equal to or lower than the melting points of the materials.
    Type: Grant
    Filed: June 10, 2004
    Date of Patent: May 2, 2006
    Assignee: Tohoku Pioneer Corporation
    Inventors: Toshinao Yuki, Kunihiko Shirahata, Akihiko Numazawa, Shinsuke Tanaka, Tsuyoshi Naijo, Masato Nakamura, Yusuke Nakajima
  • Patent number: 7038393
    Abstract: A drive device for a light-emitting display panel, having the more extended light-emitting life of an EL element, is provided. Drive switches SX1 to SXn select a reverse direction voltage ?V immediately after starting of scanning to supply the voltage ?V to all of EL elements in a scanning state. Subsequently, through the switches SX1 to SXn, constant current sources I1 to In are connected to data lines to be controlled for light emitting, and, a forward voltage +V1 (a voltage equal to or smaller than a light-emitting threshold one) is applied to data lines which do not contribute to light emitting. Thereby, the forward voltage is applied to the EL elements in a scanning state.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: May 2, 2006
    Assignee: Tohoku Pioneer Corporation
    Inventors: Masaki Murakata, Toshinao Yuki, Kunizo Ogoshi
  • Publication number: 20060082287
    Abstract: It is an object of the present invention to prevent a color tone deviation during a long-period use, so as to improve a displaying quality of a display device. Another object of the present invention is to ensure a universal use of each substrate and to prevent a complication of manufacturing process. The present invention is based on a self-emission display device in which self-emission elements of different luminescent colors are arranged in parallel or in a laminated manner, thereby enabling a color displaying by mixing a plurality of different colors. A luminescent layer of a self-emission element and a luminescent layer of another self-emission element are subjected to lowering adjustments of C1??C1 and C2??C2, so as to make uniform brightness deteriorations which are originally different due to different luminescent colors.
    Type: Application
    Filed: October 11, 2005
    Publication date: April 20, 2006
    Inventors: Toshinao Yuki, Masato Nakamura
  • Patent number: 7023140
    Abstract: An organic EL display apparatus which can improve the reliability thereof, by avoiding a leak current which occurs after an operating time, without reducing the product yield. The organic EL display apparatus is comprised of an organic EL panel section, and a driving section which has a reverse voltage restriction unit (means for restricting a reverse voltage) for restricting a reverse voltage which is applied when organic EL devices are not lighted. When a breakdown voltage with respect to a preset thickness do of the organic material layer has been Vb, the reverse voltage restriction unit will not only set the reverse voltage Vm (to be applied during a non-lighting period) to Vm<(½)·Vb, but also restrict the continuous applying time of this reverse voltage Vm within a preset period.
    Type: Grant
    Filed: November 22, 2004
    Date of Patent: April 4, 2006
    Assignee: Tohoku Pioneer Corporation
    Inventors: Toshinao Yuki, Kunihiko Shirahata, Kota Hasebe, Masaki Murakata
  • Publication number: 20050285514
    Abstract: An organic EL panel and a method of forming the same, in which a bottom electrode of an organic EL device is flattened at the surface so that organic layers deposited thereon have uniform thicknesses, thereby avoiding the occurrence of leak currents and allowing favorable luminescence characteristics. The organic EL panel has an organic EL device formed on a substrate, the device comprising the bottom electrode, the organic layers including at least an organic luminescent layer, and a top electrode. The bottom electrode has an etched surface obtained by chemically etching a polished surface of an electrode material film. The organic layers are formed on the etched surface.
    Type: Application
    Filed: June 28, 2005
    Publication date: December 29, 2005
    Inventors: Toshinao Yuki, Kunihiko Shirahata
  • Publication number: 20050206303
    Abstract: An organic EL panel which is formed by controlling the thickness of a lower electrode while at the same time improving the surface flatness of the lower electrode which serves as a support substrate for an organic layer. Films are formed through several times of film-formation on a substrate and polished to form the lower electrode serving as a substrate for an organic layer with a polished surface. In this case, a first film formation produces a first film, while second and later film formations produce other film layers which is thicker than the first film layer. Further, the formed films are polished by a thickness larger than the total thickness of films formed during the second and later film formations, thereby forming the polished surface.
    Type: Application
    Filed: March 15, 2005
    Publication date: September 22, 2005
    Inventors: Isamu Ohshita, Toshinao Yuki
  • Publication number: 20050179369
    Abstract: A panel substrate which has an improved surface flatness so as to prevent a reduced display performance of a display panel. The panel substrate of the invention comprises a substrate member, a polish processing layer formed through wet film formation on or above the substrate member, and a polished surface formed as the surface of the polish processing layer.
    Type: Application
    Filed: January 31, 2005
    Publication date: August 18, 2005
    Inventors: Isamu Ohshita, Toshinao Yuki
  • Publication number: 20050110423
    Abstract: An organic EL display apparatus which can improve the reliability thereof, by avoiding a leak current which occurs after an operating time, without reducing the product yield. The organic EL display apparatus is comprised of an organic EL panel section, and a driving section which has a reverse voltage restriction unit (means for restricting a reverse voltage) for restricting a reverse voltage which is applied when organic EL devices are not lighted. When a breakdown voltage with respect to a preset thickness do of the organic material layer has been Vb, the reverse voltage restriction unit will not only set the reverse voltage Vm (to be applied during a non-lighting period) to Vm<(½)·Vb, but also restrict the continuous applying time of this reverse voltage Vm within a preset period.
    Type: Application
    Filed: November 22, 2004
    Publication date: May 26, 2005
    Inventors: Toshinao Yuki, Kunihiko Shirahata, Kota Hasebe, Masaki Murakata
  • Publication number: 20050012451
    Abstract: A first electrode is formed above a substrate, organic material layers are stacked above the first electrode, and a second electrode is formed above the organic material layers. Among the organic material layers, at least two organic material layers having interfaces which electrons or holes traverse are formed by layers which are heat-treated at a temperature that is equal to or higher than the glass transition points of materials respectively constituting the organic material layers and equal to or lower than the melting points of the materials.
    Type: Application
    Filed: June 10, 2004
    Publication date: January 20, 2005
    Inventors: Toshinao Yuki, Kunihiko Shirahata, Akihiko Numazawa, Shinsuke Tanaka, Tsuyoshi Naijo, Masato Nakamura, Yusuke Nakajima
  • Publication number: 20040189560
    Abstract: A drive device for a light-emitting display panel, having the more extended light-emitting life of an EL element, is provided. Drive switches SX1 to SXn select a reverse direction voltage −V immediately after starting of scanning to supply the voltage −V to all of EL elements in a scanning state. Subsequently, through the switches SX1 to SXn, constant current sources I1 to In are connected to data lines to be controlled for light emitting, and, a forward voltage +V1 (a voltage equal to or smaller than a light-emitting threshold one) is applied to data lines which do not contribute to light emitting. Thereby, the forward voltage is applied to the EL elements in a scanning state.
    Type: Application
    Filed: March 15, 2004
    Publication date: September 30, 2004
    Applicant: TOHOKU PIONEER CORPORATION
    Inventors: Masaki Murakata, Toshinao Yuki, Kunizo Ogoshi
  • Publication number: 20040043252
    Abstract: The new organic electroluminescent display device has a carrier-transporting layer and/or an organic luminous layer composed of a nematic liquid crystal or a liquid crystal dispersing a carrier-transporting low-molecule therein. When the organic luminous layer is to be bestowed with faculty as a liquid crystal, it is made of a nematic liquid crystal. Both the carrier-transporting layer and the organic luminous layer may be bestowed with faculty as a liquid crystal. Since the liquid crystal is incorporated in the carrier-transporting layer and/or the organic luminous layer, the display device can be driven as a liquid crystal display device in a dark place by charging with a voltage lower than a light emission initiating potential. Of course, it is driven as an electroluminescent display device when it is charged with a voltage higher than the light emission initiating potential. Use of an electroluminescent liquid crystal as a organic luminous layer enables omission of a carrier-transporting layer.
    Type: Application
    Filed: August 28, 2003
    Publication date: March 4, 2004
    Inventors: Junji Kido, Hitoshi Nakada, Teruo Tohma, Ryuji Murayama, Toshinao Yuki
  • Publication number: 20020146590
    Abstract: This invention relates to organic electroluminescent elemental devices (organic EL devices) of excellent durability and to organic EL materials useful for such organic EL devices. The organic EL material of this invention comprises a tertiary aryl amine containing 2-4 nitrogen atoms forming triarylamines and, as impurity, compound (A) containing one less nitrogen atoms forming triarylamines than said tertiary aryl amine or compound (B) containing one more nitrogen atoms forming diarylamino groups than said tertiary aryl amine with the content of compound (A) controlled at 1 wt % or less and that of compound (B) at 2 wt % or less.
    Type: Application
    Filed: February 1, 2002
    Publication date: October 10, 2002
    Inventors: Shinji Matsuo, Kazuo Ishii, Hiroshi Miyazaki, Toshinao Yuki, Hitoshi Nakada, Ryuji Murayama, Yasuhiko Sawada, Tsuyoshi Naijo, Yoshinori Fukuda
  • Publication number: 20010048982
    Abstract: The new organic electroluminescent display device has a carrier-transporting layer 3 and/or an organic luminous layer 4 composed of a nematic liquid crystal or a liquid crystal dispersing a carrier-transporting low-molecule therein. When the organic luminous layer 4 is to be bestowed with faculty as a liquid crystal, it is made of a nematic liquid crystal. Both the carrier-transporting layer 3 and the organic luminous layer 4 may be bestowed with faculty as a liquid crystal. Since the liquid crystal is incorporated in the carrier-transporting layer 3 and/or the organic luminous layer 4, the display device can be driven as a liquid crystal display device in a dark place by charging with a voltage lower than a light emission initiating potential. Of course, it is driven as an electroluminescent display device when it is charged with a voltage higher than the light emission initiating potential.
    Type: Application
    Filed: April 27, 2001
    Publication date: December 6, 2001
    Applicant: Tohoku Pioneer Corporation
    Inventors: Junji Kido, Hitoshi Nakada, Teruo Tohma, Ryuji Murayama, Toshinao Yuki