Patents by Inventor Peter U. Schulthess

Peter U. Schulthess 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 circuit for a matrix-addressed liquid crystal display device
    Patent number: 4082430
    Abstract: In a driving circuit for a liquid crystal display matrix, a source of a direct or low-frequency voltage is connected to drive the selected row and column electrodes, and a high frequency voltage is connected to the driving circuit so that the high frequency potential is effective in combination with the low frequency or direct voltage at non-frequency voltage is effective at the selected crossovers. The high frequency voltage suppresses changes in the optical properties of the liquid crystal at the non-selected crossovers.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: April 4, 1978
    Assignee: BBC Aktiengesellschaft Brown, Boveri & Company, Ltd.
    Inventors: Peter U. Schulthess, Peter J. Wild