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Dynamic shield electrode of a stylus

  • US 9,904,378 B1
  • Filed: 12/22/2015
  • Issued: 02/27/2018
  • Est. Priority Date: 07/27/2011
  • Status: Active Grant
First Claim
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1. An elongated stylus configured to be capacitively coupled with a sensor array providing a plurality of electrodes to indicate a position on the sensor array, the stylus comprising:

  • a housing having an end in an elongated direction of the housing;

    a conductive tip disposed at least partially extended from the end of the housing;

    a shield disposed around the conductive tip and at least partially exposing the conductive tip;

    a signal transmit drive circuit configured to transmit a signal to the sensor array;

    a controller configured to control transmission of the signal to the sensor array; and

    a force sensor configured to detect pressure exerted on the conductive tip,wherein the controller, in operation, performs control to form an electrical connection between the shield and a ground in response to the force sensor detecting pressure exerted on the conductive tip, while the signal from the signal transmit drive circuit is supplied to the conductive tip, andwherein the controller, in operation, performs control to form the electrical connection between the shield and the ground in response to the force sensor detecting pressure exerted on the conductive tip, while the shield is electrically isolated from the signal transmit drive circuit.

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