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Switch scanning means for use with integrated circuits

  • US 4,277,784 A
  • Filed: 07/13/1979
  • Issued: 07/07/1981
  • Est. Priority Date: 07/13/1979
  • Status: Expired due to Term
First Claim
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1. In combination:

  • a data display device having liquid crystal display elements each characterized by a turn-on and turn-off transition interval;

    a data logic circuit having output nodes for conducting actuating signals to said liquid crystal display elements and having a data input node;

    driver conductors connecting said data logic output nodes to said display elements;

    a data input conductor connected to said data input node;

    a switch assembly including a movable switch element for electrically connecting the data input conductor to one of the driver conductors;

    a control circuit coupled to the data logic circuit for applying the actuating signals during a load interval and interrupting the actuating signals during a sampling interval, the load interval being longer than the sampling interval and the sampling interval having a duration which is less than the turn-off time of the liquid crystal display elements; and

    ,sampling means coupled to said driver conductors and to said data input conductor for pulsing said driver conductors with an electrical strobe signal having a pulse duration less than the turn-on time of the liquid crystal display elements during said sampling interval and for counting a number of repetitive events occurring during the sampling interval commencing with the first application of a strobe pulse to a driver conductor and terminating with the application of a strobe pulse to the driver conductor engaged in electrical contact with the data input conductor through said movable switch element.

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