Touch sensor panel calibration
First Claim
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1. An apparatus for calibrating a touch sensor panel including a plurality of touch electrodes, the apparatus comprising a processor programmed for:
- measuring individual capacitances of each of the touch electrodes by scanning each of the touch electrodes for a same duration;
computing a total capacitance of the touch sensor panel from the individual capacitances;
determining a percentage contribution of each of the plurality of touch electrodes to the total capacitance of the touch sensor panel; and
scanning each touch electrode for a fraction of a touch sensing time period proportional to the percentage contribution of that electrode to the total capacitance of the touch sensor panel.
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Abstract
A method for calibrating a touch sensor panel including a plurality of touch electrodes is provided. The method includes determining, for each of the plurality of touch electrodes, a contribution in terms of capacitance to a total capacitance of the touch sensor panel; and allocating a fraction of a fixed period of time for measuring a capacitance of each of the plurality of electrodes based on the electrode'"'"'s contribution to the total capacitance.
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Citations
19 Claims
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1. An apparatus for calibrating a touch sensor panel including a plurality of touch electrodes, the apparatus comprising a processor programmed for:
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measuring individual capacitances of each of the touch electrodes by scanning each of the touch electrodes for a same duration; computing a total capacitance of the touch sensor panel from the individual capacitances; determining a percentage contribution of each of the plurality of touch electrodes to the total capacitance of the touch sensor panel; and scanning each touch electrode for a fraction of a touch sensing time period proportional to the percentage contribution of that electrode to the total capacitance of the touch sensor panel. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for calibrating a touch sensor panel including a plurality of touch electrodes, the method comprising:
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measuring individual capacitances of each of the touch electrodes by scanning each of the touch electrodes for a same duration; computing a total capacitance of the touch sensor panel from the individual capacitances; determining, for each of the plurality of touch electrodes, a contribution in terms of capacitance to the total capacitance of the touch sensor panel; and scanning each touch electrode for allocating a fraction of a fixed period of time for measuring a capacitance of each of the plurality of electrodes based on, the fixed period of time proportional to the electrode'"'"'s contribution to the total capacitance. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A non-transitory computer readable storage medium storing instructions executed by a processor for calibrating a touch sensor panel including a plurality of touch electrodes, the instructions comprising:
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measuring individual capacitances of each of the touch electrodes by scanning each of the touch electrodes for a same duration; computing a total capacitance of the touch sensor panel from the individual capacitances; determining, for each of the plurality of touch electrodes, a contribution in terms of capacitance to the total capacitance of the touch sensor panel; and scanning each touch electrode for a fraction of a fixed period of time for measuring a capacitance of each of the plurality of electrodes based on, the fixed period of time proportional to the electrode'"'"'s contribution to the total capacitance. - View Dependent Claims (16, 17, 18, 19)
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Specification