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Electrostatic capacity detection apparatus and fingerprint crosscheck apparatus using the same

  • US 20030174871A1
  • Filed: 03/05/2003
  • Published: 09/18/2003
  • Est. Priority Date: 07/11/2001
  • Status: Active Grant
First Claim
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1. A capacitance sensor comprising:

  • a sensor array in which sensor cells each having a sense electrode are disposed in the form of an array;

    a dummy block having, disposed in a position corresponding to a row in an area outside the sensor array and having no relation with any object under detection, at least one dummy cell having a dummy electrode nearly identical in parasitic capacitance to the sense electrode of the sensor cell; and

    a differentiation circuit to differentiate between a sensor cell output from the sensor array and a dummy cell output from the dummy block.

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