Patents by Inventor Yi-Kai Cheng

Yi-Kai Cheng 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).

  • Circular display device with a projective light source
    Patent number: 7123811
    Abstract: A circular display includes a columnar waveguide plate and an image projection device. The upper width of the cross-section of the columnar waveguide plate is less than the bottom width of the cross-section of the columnar waveguide plate. The outer surface of the columnar waveguide plate is utilized for displaying an image, and the image projection device is used for projecting the image to the bottom of the columnar waveguide plate.
    Type: Grant
    Filed: September 1, 2005
    Date of Patent: October 17, 2006
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Jyh-Long Chen, Sen-Nien Chung, Yi-Kai Cheng, Ming-Der Chou