Patents by Inventor Seok-Hwan Cha

Seok-Hwan Cha 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).

  • Phosphor layer, image display device employing the same and method for making the phosphor layer
    Publication number: 20080203889
    Abstract: A phosphor layer having improved contrast and brightness characteristics and a display device including the same are provided. The phosphor layer is made out of an ultra-fine pigment, a dispersant, a phosphor, a photosensitizer and a binder. The phosphor has a uniform distribution along the thickness of the phosphor layer, and the pigment varies in content over the thickness of the phosphor layer. A method of forming the phosphor layer is based on existing phosphor layer processes and includes a reduced number of processing steps than a filter screen method, thereby markedly lowering the manufacturing costs. The phosphor layer can be used in a cathode ray tube, a plasma display panel, a field emission display, and an organic electroluminescent device.
    Type: Application
    Filed: February 28, 2008
    Publication date: August 28, 2008
    Inventors: Byung-Heun Kang, Jong-Sang Lee, Jac-Hong Lim, Seok-Hwan Cha, Hong-Kyu Choi
  • Phosphor layer, image display device employing the same and method for making the phosphor layer
    Patent number: 7361417
    Abstract: A phosphor layer having improved contrast and brightness characteristics and a display device including the same are provided. The phosphor layer is made out of an ultra-fine pigment, a dispersant, a phosphor, a photosensitizer and a binder. The phosphor has a uniform distribution along the thickness of the phosphor layer, and the pigment varies in content over the thickness of the phosphor layer. A method of forming the phosphor layer is based on existing phosphor layer processes and includes a reduced number of processing steps than a filter screen method, thereby markedly lowering the manufacturing costs. The phosphor layer can be used in a cathode ray tube, a plasma display panel, a field emission display, and an organic electroluminescent device.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: April 22, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Byung-Heun Kang, Jong-Sang Lee, Jae-Hong Lim, Seok-Hwan Cha, Hong-Kyu Choi
  • Phosphor layer, image display device employing the same and method for making the phosphor layer
    Publication number: 20040224187
    Abstract: A phosphor layer having improved contrast and brightness characteristics and a display device including the same are provided. The phosphor layer is made out of an ultra-fine pigment, a dispersant, a phosphor, a photosensitizer and a binder. The phosphor has a uniform distribution along the thickness of the phosphor layer, and the pigment varies in content over the thickness of the phosphor layer. A method of forming the phosphor layer is based on existing phosphor layer processes and includes a reduced number of processing steps than a filter screen method, thereby markedly lowering the manufacturing costs. The phosphor layer can be used in a cathode ray tube, a plasma display panel, a field emission display, and an organic electroluminescent device.
    Type: Application
    Filed: May 4, 2004
    Publication date: November 11, 2004
    Inventors: Byung-Heun Kang, Jong-Sang Lee, Jae-Hong Lim, Seok-Hwan Cha, Hong-Kyu Choi