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MATRIX CIRCUIT DETECTING FAILURE LOCATION IN COMMON SIGNAL

  • US 20160178689A1
  • Filed: 12/18/2015
  • Published: 06/23/2016
  • Est. Priority Date: 12/19/2014
  • Status: Active Grant
First Claim
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1. A matrix circuit of a sink type having m (m is a natural number) common signal lines and n (n is a natural number) data signal lines, the common signal lines and the data signal lines being arranged in a matrix, and m×

  • n switches each connected between the common signal line and the data signal line intersecting each other, the matrix circuit being configured such that states of keys are scanned by driving the common signal lines to a low level one by one while reading states of the data signal lines,the matrix circuit comprising;

    p (p is a natural number) monitoring signal lines that allow states of the common signal lines to be monitored;

    a storage unit in which inputs to the monitoring signal lines during one scan of the common signal lines are stored; and

    a detection unit that detects occurrence of a fault including a ground fault, a short circuit, or disconnection on any of the common signal lines to identify the faulty common signal line.

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