Multi-touch disambiguation
First Claim
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1. A method, comprising:
- performing a first scan of a plurality of sensor elements to detect a plurality of capacitances indicating a presence of multiple contacts at a touch sensing surface;
calculating a plurality of coordinates based on the plurality of capacitances, wherein the plurality of coordinates includes a plurality of row coordinates and a plurality of column coordinates, wherein the plurality of row coordinates and plurality of column coordinates indicate a plurality of possible contact locations for the multiple contacts;
in response to detecting the plurality of coordinates, performing a resolve scan of at least a first sensor element at the touch sensing surface, wherein the first sensor element corresponds to at least a first coordinate of the plurality of coordinates and wherein the resolve scan comprises;
detecting a first time constant at the first end of the first sensor element while the second end of the first sensor element is connected to a high impedance; and
detecting a second time constant at the second end of the first sensor element while the first end of the first sensor element is connected to a high impedance; and
based on the resolve scan, identifying at least one of the possible contact locations as an actual contact location.
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Abstract
Identification of at least one of a plurality of possible touch locations as an actual touch location may include detecting a plurality of possible touch locations at a touch sensing surface, wherein detecting the plurality of possible touch locations comprises performing a resolve scan of at least a first sensor element at the touch sensing surface, where the first sensor element corresponds to at least a first coordinate of the plurality of coordinates.
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Citations
18 Claims
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1. A method, comprising:
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performing a first scan of a plurality of sensor elements to detect a plurality of capacitances indicating a presence of multiple contacts at a touch sensing surface; calculating a plurality of coordinates based on the plurality of capacitances, wherein the plurality of coordinates includes a plurality of row coordinates and a plurality of column coordinates, wherein the plurality of row coordinates and plurality of column coordinates indicate a plurality of possible contact locations for the multiple contacts; in response to detecting the plurality of coordinates, performing a resolve scan of at least a first sensor element at the touch sensing surface, wherein the first sensor element corresponds to at least a first coordinate of the plurality of coordinates and wherein the resolve scan comprises; detecting a first time constant at the first end of the first sensor element while the second end of the first sensor element is connected to a high impedance; and detecting a second time constant at the second end of the first sensor element while the first end of the first sensor element is connected to a high impedance; and based on the resolve scan, identifying at least one of the possible contact locations as an actual contact location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus, comprising:
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an input configured to receive a plurality of capacitance measurements acquired using a first scan of the touch sensing surface, wherein the plurality of capacitance measurements are indicative of a plurality of row coordinates and a plurality of column coordinates, wherein the plurality of row coordinates and the plurality of column coordinates designate a plurality of possible contact locations at the touch sensing surface; and a processing logic coupled with the input, wherein the processing logic is configured to; in response to receiving the plurality of coordinates, perform a resolve scan of at least a first sensor element at the touch sensing surface, wherein the first sensor element corresponds to at least a first coordinate of the plurality of coordinates, wherein the resolve scan comprises; detecting a first time constant at the first end of the first sensor element while the second end of the first sensor element is connected to a high impedance, and detecting a second time constant at the second end of the first sensor element while the first end of the first sensor element is connected to a high impedance; and based on the resolve scan, identify at least one of the possible contact locations as an actual contact location. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification