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Calibration for pressure effects on touch sensor panels

  • US 9,459,738 B2
  • Filed: 06/06/2012
  • Issued: 10/04/2016
  • Est. Priority Date: 03/06/2012
  • Status: Active Grant
First Claim
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1. A non-transitory computer readable storage medium having stored thereon a set of instructions for controlling a touch sensor panel comprising a plurality of touch nodes of the touch sensor panel sharing a common local oscillator, that when executed by a processor causes the processor to:

  • generate one or more stimulation signals to stimulate one or more drive lines by a drive circuitry;

    operate a control logic for controlling a sense circuitry;

    capture one or more first output values from one or more sense channels of the sense circuitry while the touch sensor panel is in a compressed state,wherein the touch sensor panel includes a gap at least partially between a touch sensor stackup and a display stackup, the gap capable of being compressed when pressure is applied to the touch sensor panel such that at least one portion of the display stackup and at least one portion of the touch sensor stackup are closer together in the compressed state than in a non-compressed state;

    capture one or more second output values from the one or more sense channels of the sense circuitry while the touch sensor panel is in the non-compressed state; and

    configure the drive circuitry, the sense circuitry, or both to reduce a difference between the one or more first output values and the one or more second output values by setting the variable phase, frequency, or both of the common local oscillator to a value based on the one or more first output signal values and the one or more second output signal values associated with respective nodes of the plurality of touch nodes sharing the common local oscillator, the one or more first output values and the one or more second output values indicative of a substantially equivalent touch or no-touch input condition of the touch sensor panel, the touch or no-touch input condition associated with a proximity of a conductive object to the touch sensor panel.

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