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Touch screen for stylus emitting wireless signals

  • US 9,454,272 B2
  • Filed: 05/22/2014
  • Issued: 09/27/2016
  • Est. Priority Date: 05/22/2014
  • Status: Active Grant
First Claim
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1. A touch screen device, comprising:

  • a touch screen with a plurality of conductors configured to receive wireless signals from a stylus touching the touch screen, said wireless signals comprising a plurality of signals having different frequencies that digitally encode stylus information;

    a circuit coupled to the plurality of conductors and configured to generate amplified and digitized representations of the received wireless signals; and

    a processor configured to convert the digitized representations of the wireless signals from the time domain to the frequency domain and use magnitudes in the frequency domain to decode the stylus information and determine a location of the stylus on the touch screen.

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