Patents by Inventor Deak-Su Lee

Deak-Su Lee 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).

  • Method of manufacturing IPS-LCD using 4-mask process
    Patent number: 6972819
    Abstract: A method of manufacturing an IPS-LCD using a 4-mask process including forming amorphous silicon islands and contact holes using the same mask. Each amorphous silicon island is used to form the channel of one transistor inside the active area, and each contact hole is used to form a portion of an anti-ESD circuit around the active area. Amorphous silicon islands and the contact holes are also found using a phase-shaft mask. The phase shift mask at least includes a high transmittance area, a low transmittance area, and a transparent area.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: December 6, 2005
    Assignee: Hannstar Display Corporation
    Inventors: Deak-Su Lee, Sakae Tanaka