Patents by Inventor Jan-Kwei J. Li

Jan-Kwei J. Li 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).

  • Video display controller for expanding monochrome data to programmable foreground and background color image data
    Patent number: 4878181
    Abstract: A circuit which expands monochrome character image patterns to color form for use in a raster scanned computer display system. Monochrome patterns are expanded from one bit per pixel to n bits per pixel. Foreground and background colors are programmable in a pattern generator which uses data from the expanded source patterns to select appropriate colors and characters for a destination pattern to be displayed. The expanded multicolor image is generated by hardware.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: October 31, 1989
    Assignee: Signetics Corporation
    Inventors: Craig A. MacKenna, Jan-Kwei J. Li
  • Raster scan video controller with programmable prioritized sharing of display memory between update and display processes and programmable memory access termination
    Patent number: 4782462
    Abstract: In a bit-mapped display system, a logical subsystem for programmable sharing of access to a memory in a computer system among a plurality of system resources wherein various modes of operation are supported by the logic and are programmably selected by the user. The use of display memory is controlled between updating and display accesses to prevent breakup of the video image while said image is being changed.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: November 1, 1988
    Assignee: Signetics Corporation
    Inventors: Cecil H. Kaplinsky, Jan-Kwei J. Li