Patents by Inventor Taizou Tanaka

Taizou Tanaka 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: 7042152
    Abstract: Provided are an organic EL device and method of fabricating the same. The organic EL device includes a main element portion in which an anode, a hole transport layer, an organic emission layer, a first cathode, and a second cathode are stacked on a transparent insulating substrate, wherein oxygen is contained at an interface between the organic emission layer and the first cathode, so that the throughput for the device fabrication may not be lowered and a high rectification ratio may be obtained.
    Type: Grant
    Filed: October 16, 2001
    Date of Patent: May 9, 2006
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Taizou Tanaka
  • Patent number: 6794815
    Abstract: An organic electroluminescent display (EL) device includes a substrate, an organic light emitting portion formed such that a positive electrode formed in a predetermined pattern, an organic layer formed on the positive electrode, and a negative electrode having a predetermined pattern in a direction orthogonal with the positive electrode are sequentially stacked, an encapsulation cap which encapsulates the organic light emitting portion, first and second groups of electrodes which are drawn out from at least one edge of the encapsulation cap and connected to the positive and negative electrodes to drive the organic light emitting portion, and first and second dummy electrodes formed at one side of the substrate.
    Type: Grant
    Filed: January 28, 2003
    Date of Patent: September 21, 2004
    Assignee: Samsung Oled Co., Ltd.
    Inventors: Ju-won Lee, Cheol-sig Son, Sang-ho Lee, Akihiro Yano, Taizou Tanaka, Atsushi Kota, Hideki Ito
  • Patent number: 6630253
    Abstract: A material for the luminescent layer of an organic EL device includes a bis-2,5-(2-benzazolyl) hydroquinone compound represented by a general formula: where each of R1-R8 independently represents hydrogen atom, halogen atom, hydroxy group, substituted or unsubstituted amino group, nitro group, cyano group, substituted or unsubstituted alkyl group, substituted or unsubstituted alkenyl group, substituted or unsubstituted cycloalkyl group, substituted or unsubstituted alkoxy group, substituted or unsubstituted aromatic hydrocarbon group, substituted or unsubstituted aromatic complex ring group, substituted or unsubstituted aralkyl group, substituted or unsubstituted aryloxy group, substituted or unsubstituted alkoxy carbonyl group, or carboxyl group, and any two of R1-R8 may form a ring and “X” represents “NH”, “O” or “S”.
    Type: Grant
    Filed: March 23, 1999
    Date of Patent: October 7, 2003
    Assignee: NEC Corporation
    Inventors: Taizou Tanaka, Satoru Toguchi, Kenji Mori
  • Patent number: 6623324
    Abstract: A method for manufacturing an organic EL device is provided which is capable of preventing an occurrence of a leakage current caused by heat in an encapsulation process. In the method for manufacturing the organic EL device, optical annealing is performed, before being encapsulated, by applying light with an irradiation wavelength &lgr; within a range of 300 nm to 500 nm to a transparent insulating substrate on which main components made up of an anode, hole transporting layer, organic light emitting layer, and cathode are formed.
    Type: Grant
    Filed: October 16, 2001
    Date of Patent: September 23, 2003
    Assignee: NEC Corporation
    Inventor: Taizou Tanaka
  • Publication number: 20030146694
    Abstract: An organic electroluminescent display (EL) device includes a substrate, an organic light emitting portion formed such that a positive electrode formed in a predetermined pattern, an organic layer formed on the positive electrode, and a negative electrode having a predetermined pattern in a direction orthogonal with the positive electrode are sequentially stacked, an encapsulation cap which encapsulates the organic light emitting portion, first and second groups of electrodes which are drawn out from at least one edge of the encapsulation cap and connected to the positive and negative electrodes to drive the organic light emitting portion, and first and second dummy electrodes formed at one side of the substrate.
    Type: Application
    Filed: January 28, 2003
    Publication date: August 7, 2003
    Applicant: SAMSUNG NEC MOBILE DISPLAY CO., LTD.
    Inventors: Ju-won Lee, Cheol-sig Son, Sang-ho Lee, Akihiro Yano, Taizou Tanaka, Atsushi Kota, Hideki Ito
  • Publication number: 20020043934
    Abstract: An organic EL device and a method for manufacturing the organic EL device are provided which are capable of providing a high rectification ratio without a decrease in a throughput in manufacturing the organic EL device.
    Type: Application
    Filed: October 16, 2001
    Publication date: April 18, 2002
    Applicant: NEC Corporation
    Inventor: Taizou Tanaka
  • Publication number: 20020045397
    Abstract: A method for manufacturing an organic EL device is provided which is capable of preventing an occurrence of a leakage current caused by heat in an encapsulation process.
    Type: Application
    Filed: October 16, 2001
    Publication date: April 18, 2002
    Applicant: NEC Corporation
    Inventor: Taizou Tanaka
  • Patent number: 6358765
    Abstract: In a method for manufacturing an organic EL element, a low-resistance conductive layer is formed on an electrode of an organic EL element formed on a substrate in a state in which the substrate is at a temperature not higher than the freezing point so that no abnormal current nor short circuit occurs on the organic EL element when applying a voltage to it.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: March 19, 2002
    Assignee: NEC Corporation
    Inventor: Taizou Tanaka
  • Publication number: 20010049153
    Abstract: In a method for manufacturing an organic EL element, a low-resistance conductive layer is formed on an electrode of an organic EL element formed on a substrate in a state in which the substrate is at a temperature not higher than the freezing point so that no abnormal current nor short circuit occurs on the organic EL element when applying a voltage to it.
    Type: Application
    Filed: December 28, 2000
    Publication date: December 6, 2001
    Applicant: NEC CORP
    Inventor: Taizou Tanaka
  • Publication number: 20010009280
    Abstract: In an organic electroluminescence display device having organic EL elements stacked on a substrate having a plurality of thin-film transistors formed on it, a plurality of pixel electrodes each being electrically connected to either one of the source region and the drain region of each of the thin-film transistors are provided on a flattening layer, and an electron injection layer of an electric insulator such as lithium fluoride is formed commonly on the plurality of pixel electrodes. And an organic layer including a light-emission layer and a hole injection layer are formed on this electron injection layer.
    Type: Application
    Filed: January 18, 2001
    Publication date: July 26, 2001
    Applicant: NEC CORPORATION
    Inventors: Taizou Tanaka, Kenji Takata
  • Patent number: 6068940
    Abstract: Described is an organic electroluminescent device material which comprises a coumarin derivative represented by the following formula (1): ##STR1## wherein R.sub.1 to R.sub.4 each independently represents a hydrogen atom, a halogen atom or a substituted or unsubstituted alkyl, alkoxy, thioalkyl, aryloxy, arylthio, carbocyclic aromatic or heterocyclic aromatic group; and an organic electroluminescent device fabricated using the material. According to the present invention, a red-emitting material with high brightness and high luminous efficiency indispensable for full color display can be provided.
    Type: Grant
    Filed: May 22, 1998
    Date of Patent: May 30, 2000
    Assignee: NEC Corporation
    Inventor: Taizou Tanaka
  • Patent number: 6028327
    Abstract: A light-emitting device using an organic EL element can be used in equipment demanding a small-scale and light-weight configuration. The light-emitting device includes an organic electroluminescent light-emitting element, a secondary battery such as a lithium battery and a shared cathode layer, which functions both as a cathode layer of the organic electroluminescent light-emitting element and as at least one cathode activator layer of the secondary battery. The organic electroluminescent light-emitting element and the secondary battery are provided in a single body manner via the shared cathode layer. The shared cathode layer comprises, for example, a metal having a work function of no greater than 4.3 eV.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: February 22, 2000
    Assignee: NEC Corporation
    Inventors: Katsuhiro Mizoguchi, Taizou Tanaka
  • Patent number: 5717289
    Abstract: A thin film electroluminescent element has a color changing layer doped with green luminescent material and red fluorescent material and separated from an electroluminescent layer for generating blue light for converting the blue light to green light and the green light to red light, and the separation results in reduction of trapping center in the electroluminescent layer.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: February 10, 1998
    Assignee: NEC Corporation
    Inventor: Taizou Tanaka