Patents Assigned to BBC Aktiengesellschaft Brown, Boveri & Company, Ltd.
  • 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