Patents by Inventor Chang Chul Ha

Chang Chul Ha 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).

  • Patterned seed layer suitable for electron-emitting device, and associated fabrication method
    Patent number: 7071603
    Abstract: An electron-emitting device contains an emitter seed layer patterned into multiple laterally separated sections situated between the electron-emissive elements, on one hand, and emitter electrodes, on the other hand. Sections of the seed layer are spaced apart along each emitter electrode to electrically decouple electron emission elements disposed on the seed layer.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: July 4, 2006
    Assignee: cDream Corporation
    Inventors: Chang Chul Ha, Son Jong Woo, Kim Jung Jae
  • Sectioned resistor layer for a carbon nanotube electron-emitting device
    Patent number: 7053538
    Abstract: An electron-emitting device contains an emitter resistor layer patterned into multiple laterally separated sections situated between the electron-emissive elements, on one hand, and emitter electrodes, on the other hand. Sections of the seed layer are spaced apart along each emitter electrode to electrically decouple electron emission elements disposed on the resistor layer.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: May 30, 2006
    Assignee: cDream Corporation
    Inventors: Chang Chul Ha, Kang Sung Gu
  • Negative voltage driving of a carbon nanotube field emissive display
    Patent number: 7005807
    Abstract: An electron-emitting display device contains an emitter electrode, an anode and a gate electrode and an electron emission control device. The electron emission control device includes a plurality of voltage controllers which applies a positive voltage charge to the anode and emitter electrode respective. A third voltage controller applies a negative voltage charge to the gate inhibiting electron emission from electron emissive elements in the display device.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: February 28, 2006
    Assignee: cDream Corporation
    Inventors: Chang Chul Ha, Lee Choon Rae
  • Patterned seed layer suitable for electron-emitting device, and associated fabrication method
    Publication number: 20040056579
    Abstract: An electron-emitting device contains an emitter seed layer patterned into multiple laterally separated sections situated between the electron-emissive elements, on one hand, and emitter electrodes, on the other hand. Sections of the seed layer are spaced apart along each emitter electrode to electrically decouple electron emission elements disposed on the seed layer.
    Type: Application
    Filed: February 20, 2002
    Publication date: March 25, 2004
    Inventors: Chang Chul Ha, Son Jong Woo, Kim Jung Jae