Patents by Inventor Task Sang Hahn

Task Sang Hahn 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).

  • White-light emitting electroluminescent display device and manufacturing method thereof
    Patent number: 5955835
    Abstract: An improved white-light emitting electroluminescent display device and a manufacturing method thereof capable of advantageously generating a light having a red, blue, and green wave lengths within a unique material, which includes a substrate; a lower electrode disposed on the substrate; a first dielectric layer disposed on the lower electrode; a ZnS:Pr,Mn light-emitting layer disposed on the first dielectric layer; a second dielectric layer; and an upper electrode disposed on the second dielectric layer. In addition, a fabrication method thereof includes the steps of forming a first dielectric layer on an upper electrode; forming a light-emitting layer on the first dielectric layer by depositing a ZnS:Pr,Mn luminescent material made of Pr of 1.4.about.0.5 mol % and Mn of 0.1.about.0.01 mol % on a ZnS host material; forming a second dielectric layer on the light-emitting layer; and forming a lower electrode on the second dielectric layer.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: September 21, 1999
    Assignee: Korea Institute of Science and Technology
    Inventors: Myung Hwan Oh, Task Sang Hahn, Yun Hi Lee, Seong Jae Jeung, Young Dae Ju, Jin Ho Sunwoo