Patents by Inventor Cornelis Z. van Doorn

Cornelis Z. van Doorn 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).

  • Matrix excitation circuit for an oscilloscope display screen comprising a liquid crystal
    Patent number: 4468661
    Abstract: For the display of a phenomenon or a small number of phenomena by means of an oscilloscope comprising a liquid crystal display screen, a simple matrix excitation circuit is described wherein a time-division multiplex excitation with a great number of lines and a good contrast appears possible if for each column only one or a few picture elements must be set to the ON-state, costly provisions such as voltage and temperature stabilization being required.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: August 28, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis Z. Van Doorn, Jean H. J. Lorteije
  • Liquid crystal display for large time multiplexing factors
    Patent number: 4231035
    Abstract: A liquid crystal display screen of the twisted nematic type comprising a liquid crystal having a dielectric relaxation and a high dispersion of .epsilon..sub.11 is used in a display device with a dual-frequency control. This structure enables the implementation of matrix-multiplex display devices having large pluralities of lines which must be successively scanned.
    Type: Grant
    Filed: October 20, 1978
    Date of Patent: October 28, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis Z. van Doorn, Jacobus J. M. J. DeKlerk