Patents Assigned to cDream Corporation
  • Patent number: 7175494
    Abstract: An electron-emitting device contains a vertical emitter electrode patterned into multiple laterally separated sections situated between the electron-emissive elements, on one hand, and a substrate, on the other hand. The electron-emissive elements comprising carbon nanotubes are grown at a temperature range of 300° C. to 500° C. compatible with the thermal stress of the underlying substrate. The electron-emissive elements are grown on a granulized catalyst layer that provides a large surface area for growing the electron-emissive elements at such low temperature ranges. To ensure growth uniformity of the carbon nanotubes, the granularized substrate is soaked in a pre-growth plasma gas to enhance the surface diffusion properties of the granularized substrate for carbon diffusion.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: February 13, 2007
    Assignee: cDream Corporation
    Inventors: Sung Gu Kang, Woo Kyung Bae, Jung Jae Kim
  • 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
  • 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
  • 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
  • Patent number: 6984535
    Abstract: An electron-emitting device including a protective layer that is formed on a catalyst layer to protect the catalyst layer from the deleterious environmental conditions before or during a cathode process. The present invention further includes a half etching process that is adapted to partially remove portions of the protective layer from the catalyst layer to etch the catalyst layer except carbon nano-tube growing portions. Portions of the protective layer still remain on the catalyst layer to protect the catalyst layer from the deleterious conditions from next cathode formation process.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: January 10, 2006
    Assignee: cDream Corporation
    Inventors: Jong Woo Son, Chul Ha Chang, Jung-Jae Kim, Koji Suzuki, Takashi Kuwahara