Patents by Inventor Hitoshi Wakai

Hitoshi Wakai 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: 6975066
    Abstract: An object is to provide an organic EL element which can realize the improvement in the difference of an emission luminance due to the difference of an emission rise time in a plurality of light emitting portions. Segment portions S for determining an emission in a specific shape and wiring portions L for separately supplying electric currents to the segment portions S are formed. An area of the wiring portion L of the segment portion S is enlarged such that an emission luminance in the segment portion S falls within a range of from a minimum luminance to a luminance 30% higher than that.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: December 13, 2005
    Assignee: Nippon Seiki Co., Ltd.
    Inventors: Hitoshi Wakai, Jun-Ichi Maruyama, Hiroshi Ohkawa
  • Patent number: 6570337
    Abstract: A luminous display unit 10.0 has plural segments 21a to 21g (light emitting portions) by using a self light emitting element reduced in light emitting luminance in accordance with a light emitting time and has differences in light emitting time in their light emitting portions. The light emitting luminance of a light emitting portion having a long light emitting time and the light emitting luminance of a light emitting portion having a short light emitting time at a using time of the luminous display unit 100 are set to be different from each other from the first so as not to recognize a difference in light emitting luminance caused between both the light emitting portions at said using time.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: May 27, 2003
    Assignee: Nippon Seiki Co., Ltd.
    Inventors: Hitoshi Wakai, Jun-Ichi Maruyama
  • Publication number: 20020163298
    Abstract: An object is to provide an organic EL element which can realize the improvement in the difference of an emission luminance due to the difference of an emission rise time in a plurality of light emitting portions. Segment portions S for determining an emission in a specific shape and wiring portions L for separately supplying electric currents to the segment portions S are formed. An area of the wiring portion L of the segment portion S is enlarged such that an emission luminance in the segment portion S falls within a range of from a minimum luminance to a luminance 30% higher than that.
    Type: Application
    Filed: May 13, 2002
    Publication date: November 7, 2002
    Inventors: Hitoshi Wakai, Jun-Ichi Maruyama, Hiroshi Ohkawa