Patents by Inventor Celene Chang

Celene Chang 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).

  • Driving scheme for liquid crystal display
    Patent number: 6646638
    Abstract: A driving scheme for a liquid crystal display of any order and dimension, comprising matrix building blocks possessing Orthogonal and Shift Orthogonality properties. The driving scheme uses paraunitary matrices of the order M×(N+1)M as the orthogonal building blocks.
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: November 11, 2003
    Assignee: Varintelligent (BVI) Limited
    Inventors: Steven Wai Leung Yeung, Siu Kwan Kwok, James G. N. Lee, Celene Chang
  • Bistable twisted nematic LCD without an initial twist angle of 180 degrees and not a multiple of 90 degrees
    Patent number: 6573971
    Abstract: A bistable twisted nematic LCD cell is presented. The cell includes front and rear polarizes, substrates and a liquid crystal layer between the substrates. Rubbing directions are arranged to give an initial twist angle of the liquid crystal, arranged such that the cell does not make a configuration with an initial twist angle of 180° and wherein an initial twist angle is not a multiple of 90°, and a twist angle is in the range of 30-80°, with a retardation in the range of 0.33-0.44 &mgr;m.
    Type: Grant
    Filed: February 3, 2000
    Date of Patent: June 3, 2003
    Assignee: Varintelligent (BVI) Limited
    Inventors: Steven Wai Leung Yeung, Siu Kwan Kwok, Celene Chang