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Optical stylus synchronization

  • US 8,982,090 B2
  • Filed: 01/01/2012
  • Issued: 03/17/2015
  • Est. Priority Date: 01/01/2012
  • Status: Active Grant
First Claim
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1. A user input device comprising:

  • a display;

    a capacitance sensor array disposed in a stackup with the display;

    a capacitance sensor circuit coupled to the capacitance sensor array; and

    an optical transmit (TX) circuit coupled to the capacitance sensor circuit, wherein the optical TX circuit is configured to receive a first signal from the capacitance sensor circuit and to transmit the first signal via light passing through the capacitance sensor array to an optical receiver included in a stylus, wherein the capacitance sensor circuit is configured to measure a capacitance using a second signal generated responsive to the first signal, and wherein the second signal is received by the capacitance sensor array.

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