Patents by Inventor Franciscus J. J. Blommaert

Franciscus J. J. Blommaert 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).

  • Electro-optical display device with sub-electrodes
    Patent number: 5347393
    Abstract: In a bistable switching display device the occurrence of artefacts due to considerable changes of periodicity between successive grey scale stages is reduced by a suitable subdivision of the electrodes (112). To this end a drive unit (116) allocates fewer than 2.sup.n grey scale stages to each pixel (113) which is subdivided into n sub-pixels (113.sup.a, 113.sup.b, 113.sup.c). The change of periodicity will decrease when a suitable division of the surface ratios and drive sequence are chosen.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: September 13, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Johannes A. M. M. Van Haaren, Franciscus J. J. Blommaert, Antonius G. H. Verhulst