Patents by Inventor Tsujimura Takatoshi

Tsujimura Takatoshi 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).

  • Low threshold voltage instability amorphous silicon field effect transistor structure and biasing for active matrix organic light-emitting diodes
    Patent number: 6872974
    Abstract: A circuit for providing a current to an organic light emitting diode comprising: (a) an amorphous silicon field effect transistor having a gate electrode and a drain electrode through which the current is provided to the organic light emitting diode; and (b) a controller for controlling a bias between the gate electrode and the drain electrode to maintain a threshold voltage shift of less than about 1V. The organic light emitting diode is preferably a component in an active matrix.
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: March 29, 2005
    Assignee: International Business Machines Corporation
    Inventors: Paul S Andry, Frank R Libsch, Tsujimura Takatoshi
  • Low threshold voltage instability amorphous silicon field effect transistor structure and biasing for active matrix organic light-emitting diodes
    Publication number: 20030094616
    Abstract: A circuit for providing a current to an organic light emitting diode comprising: (a) an amorphous silicon field effect transistor having a gate electrode and a drain electrode through which the current is provided to the organic light emitting diode; and (b) a controller for controlling a bias between the gate electrode and the drain electrode to maintain a threshold voltage shift of less than about 1V. The organic light emitting diode is preferably a component in an active matrix.
    Type: Application
    Filed: November 20, 2002
    Publication date: May 22, 2003
    Applicant: International Business Machines Corporation
    Inventors: Paul S. Andry, Frank R. Libsch, Tsujimura Takatoshi