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Resistor matrix offset compensation

  • US 8,706,432 B2
  • Filed: 05/19/2011
  • Issued: 04/22/2014
  • Est. Priority Date: 05/19/2011
  • Status: Active Grant
First Claim
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1. A method of measuring resistance in each of a plurality of resistors arranged in a resistor matrix, each resistor being located at a different intersection between a column conductor and a row conductor, and each resistor selectively connecting that column conductor to that row conductor with a variable resistance, the method comprising:

  • applying a column conductor voltage and a row conductor voltage to determine an offset error row current of each row conductor;

    scanning each row conductor to identify if that row conductor is connected to a column conductor by one of the plurality of resistors;

    if that row conductor is connected to a column conductor by one of the plurality of resistors, scanning each resistor connected to that row conductor to determine if that resistor is connecting a column conductor to that row conductor; and

    if that resistor is connecting a column conductor to that row conductor, outputting an offset compensated resistance of that resistor calculated from a row current measured for that resistor less the offset error row current for that row conductor.

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