TOUCH SENSING
First Claim
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1. An apparatus comprising:
- a plurality of capacitors each having a first electrode and a second electrode;
charging circuitry coupled to the first electrodes;
sensing circuitry coupled to the second electrodes, the sensing circuitry configured to detect changes in capacitance across the capacitors responsive to movement of an input object related to the apparatus;
a low pass filter to filter an output of the sensing circuitry;
an analog to digital converter connected to the output of the low pass filter; and
interpolating circuitry to identify which one of the capacitors is nearest to the input object according to the detected capacitance changes.
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Abstract
In one embodiment, an apparatus comprises a plurality of capacitors, each having a first electrode and a second electrode. The apparatus includes charging circuitry coupled to the first electrodes and sensing circuitry coupled to the second electrodes, the sensing circuitry configured to detect changes in capacitance across the capacitors responsive to movement of an input object relative to the apparatus. Interpolating circuitry identifies which one of the capacitors is nearest to the input object according to the detected capacitance changes.
34 Citations
20 Claims
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1. An apparatus comprising:
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a plurality of capacitors each having a first electrode and a second electrode; charging circuitry coupled to the first electrodes; sensing circuitry coupled to the second electrodes, the sensing circuitry configured to detect changes in capacitance across the capacitors responsive to movement of an input object related to the apparatus; a low pass filter to filter an output of the sensing circuitry; an analog to digital converter connected to the output of the low pass filter; and interpolating circuitry to identify which one of the capacitors is nearest to the input object according to the detected capacitance changes. - View Dependent Claims (2, 3, 4, 5)
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6. (canceled)
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11. An apparatus comprising:
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a first set of electrodes; a second set of electrodes arranged non-parallel with respect to the first set of electrodes; a first insulating layer located between the sets of electrodes; a second insulating layer adjacent to only one of the sets of electrodes; charge generation circuitry coupled to the electrodes of the first set, the charge generation circuitry to electrically charge the electrodes of the first set thereby forming capacitance across the first insulating layer; sensing circuitry coupled to the electrodes of the second set, the sensing circuitry to monitor for changes in the capacitance across the first insulating layer; a low pass filter to filter an output of the sensing circuit; and an analog to digital converter connected to the output of the low pass filter. - View Dependent Claims (7, 8, 9, 10, 12)
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13. A method, comprising:
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monitoring changes in capacitance across a plurality of capacitors using sensing circuitry, each of the capacitors having an electrode pair, only one of the electrodes of each pair being electrically coupled to charging circuitry; filtering an output of said sensing circuitry using a low pass filter; sampling an output of the sensing circuitry using an analog to digital converter; and determining the position of at least one object on a touch device according to the monitored capacitance changes. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification