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Systems for an electrostatic stylus within a capacitive touch sensor

  • US 9,239,637 B2
  • Filed: 08/30/2010
  • Issued: 01/19/2016
  • Est. Priority Date: 08/30/2010
  • Status: Active Grant
First Claim
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1. A method for use with a two dimensional sensor array, the method comprising:

  • in a transmission mode, configuring a device having a circuit and an electrode for transmitting a voltage to a node of the two dimensional sensor array coupled electrostatically to the electrode by;

    generating a voltage using a switchmode power supply circuit, wherein the switchmode power supply circuit comprises at least an inductor and a diode, the diode being coupled to a transformer,permitting the diode to be intermittently forward-biased, and permitting current to flow through the diode into a stray capacitance, andconfiguring a switch to electrically isolate a component in the circuit; and

    in a receiving mode, configuring the circuit for receiving the current through the node coupled to the electrode by;

    configuring the switch to receive the current into the electrically isolated component in the circuit, andconfiguring the diode to be reversed-biased such that the component is electrically isolated from an inductance of the transformer in the switchmode power supply circuit; and

    further in the receiving mode, configuring the circuit for determining a position of the electrode with respect to the two dimensional sensor array based on the received current.

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