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Touch screen detection and diagnostics

  • US 8,487,884 B2
  • Filed: 06/24/2008
  • Issued: 07/16/2013
  • Est. Priority Date: 06/24/2008
  • Status: Active Grant
First Claim
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1. A method comprising:

  • driving a first current at a touch screen in response to a contact event to the touch screen, a magnitude of the first current based on a presence of the contact event to the touch screen;

    generating a second current proportional to the first current via a first current mirror;

    generating a voltage at a detection node based on the second current;

    detecting the contact event based on the voltage at the detection node; and

    determining whether the touch screen is shorted to a reference voltage based on whether the voltage at the detection node changes in response to a presence of the contact event at the touch screen.

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