CAPACITIVE TOUCH SYSTEM USING BOTH SELF AND MUTUAL CAPACITANCE
First Claim
1. A method for determining multiple touch events in a multi-touch sensor system having a touch sensor including a plurality of nodes defined by a plurality of electrodes, the method comprising:
- performing self capacitance measurements for at least two of the plurality of electrodes;
detecting one or more touched electrodes as a result of the performed self capacitance measurements;
performing a plurality of mutual capacitance measurements for only a subset of the nodes, wherein the subset is fewer than all of the nodes and includes at least the nodes corresponding to the touched electrodes; and
detecting two or more touched nodes as a result of the plurality of mutual capacitance measurements.
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Accused Products
Abstract
Systems and methods for determining multiple touch events in a multi-touch sensor system are provided. The system may have a touch sensor including nodes defined by a plurality of electrodes, which may comprise a first and second set. The method may include measuring self capacitance for at least two electrodes, detecting a touched electrode, and measuring the mutual capacitance for only a subset of the nodes (e.g., fewer than all of the nodes and including at least the nodes corresponding to the touched electrodes) resulting in the detection of two or more touched nodes. The self capacitance measurements may be performed on each of the electrodes, and the touched electrodes may comprise electrodes from both the first and second sets. Alternatively, the self capacitance measurements may be performed only on electrodes in the first set, and the touched electrodes may comprise electrodes from only the first set.
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Citations
18 Claims
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1. A method for determining multiple touch events in a multi-touch sensor system having a touch sensor including a plurality of nodes defined by a plurality of electrodes, the method comprising:
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performing self capacitance measurements for at least two of the plurality of electrodes; detecting one or more touched electrodes as a result of the performed self capacitance measurements; performing a plurality of mutual capacitance measurements for only a subset of the nodes, wherein the subset is fewer than all of the nodes and includes at least the nodes corresponding to the touched electrodes; and detecting two or more touched nodes as a result of the plurality of mutual capacitance measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for detecting one or more touch events on a touch sensor, comprising:
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a touch sensor having a plurality of nodes defined by a plurality of electrodes; self capacitance measuring means for measuring the self capacitance of each of the plurality of electrodes; mutual capacitance measuring means for measuring the mutual capacitance at only a subset of the nodes, wherein the subset is fewer than all of the nodes and is determined based on an output of the self capacitance measuring means; and means for detecting, based on the output of the self capacitance measuring means and an output of the mutual capacitance measuring means, two or more touched nodes.
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15. A system for detecting one or more touch events on a touch sensor, comprising:
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a touch sensor having a plurality of nodes defined by a plurality of electrodes; and a touch controller having a self capacitance measuring means for measuring the self capacitance of each of the plurality of electrodes, and a mutual capacitance measuring means for measuring the mutual capacitance of each of the plurality of nodes; wherein the touch controller is operable to; perform, using the self capacitance measuring means, self capacitance measurements for at least two of the plurality of electrodes; detect one or more touched electrodes as a result of the performed self capacitance measurements; perform, using the mutual capacitance measuring means, a plurality of mutual capacitance measurements for only a subset of the nodes, wherein the subset is fewer than all of the nodes and includes at least the nodes corresponding to the touched electrodes; and detect two or more touched nodes as a result of the plurality of mutual capacitance measurements. - View Dependent Claims (16, 17, 18)
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Specification