Predictive touch surface scanning
First Claim
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1. A device comprising:
- a touch-sensing surface comprising a plurality of electrodes;
a capacitance sensing circuit coupled to the plurality of electrodes to measure changes in capacitance at intersections between pairs of the plurality of electrodes; and
processing logic coupled to the capacitance sensing circuit, wherein the processing logic is configured for;
based on a previously known location and a determined direction of travel of a conductive object proximate to the touch-sensing surface, identifying a predicted location of the conductive object;
using the predicted location of the conductive object, identifying a first search window of the touch-sensing surface comprising a first set of unit cells, wherein the first search window is less than a full area of the touch-sensing surface;
performing a first scan of the first search window to detect changes in capacitance associated with the conductive object;
in response to performing the first scan and in accordance with a determination that the changes in capacitance associated with the conductive object do not satisfy a first search window capacitance criterion, identifying a second search window of the touch-sensing surface, comprising a second set of unit cells, that extends from the first search window in only a same direction as the determined direction of travel of the conductive object; and
performing a second scan of the second search window with at least one of a reduced scan rate or a reduced resolution to detect any additional changes in capacitance associated with the conductive object proximate to the touch-sensing surface within the second search window.
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Abstract
A method for locating a conductive object at a touch-sensing surface may include detecting a first resolved location for the conductive object at the touch-sensing surface based on a first scan of the touch-sensing surface, predicting a location for the conductive object, and determining a second resolved location for the conductive object by performing a second scan of a subset of sensor electrodes of the touch-sensing surface, wherein the subset of sensor electrodes is selected based on the predicted location of the conductive object.
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Citations
7 Claims
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1. A device comprising:
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a touch-sensing surface comprising a plurality of electrodes; a capacitance sensing circuit coupled to the plurality of electrodes to measure changes in capacitance at intersections between pairs of the plurality of electrodes; and processing logic coupled to the capacitance sensing circuit, wherein the processing logic is configured for; based on a previously known location and a determined direction of travel of a conductive object proximate to the touch-sensing surface, identifying a predicted location of the conductive object; using the predicted location of the conductive object, identifying a first search window of the touch-sensing surface comprising a first set of unit cells, wherein the first search window is less than a full area of the touch-sensing surface; performing a first scan of the first search window to detect changes in capacitance associated with the conductive object; in response to performing the first scan and in accordance with a determination that the changes in capacitance associated with the conductive object do not satisfy a first search window capacitance criterion, identifying a second search window of the touch-sensing surface, comprising a second set of unit cells, that extends from the first search window in only a same direction as the determined direction of travel of the conductive object; and performing a second scan of the second search window with at least one of a reduced scan rate or a reduced resolution to detect any additional changes in capacitance associated with the conductive object proximate to the touch-sensing surface within the second search window. - View Dependent Claims (2, 3)
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4. A method comprising,
at a touch-sensitive device including a touch-sensing surface: -
based on a previously known location and a determined direction of travel of a conductive object proximate to the touch-sensing surface, identifying a predicted location of the conductive object; using the predicted location of the conductive object, identifying a first search window of the touch-sensing surface comprising a first set of unit cells, wherein the first search window is less than a full area of the touch-sensing surface; performing a first scan of the first search window to detect changes in capacitance associated with the conductive object; in response to performing the first scan and in accordance with a determination that the changes in capacitance associated with the conductive object do not satisfy a first search window capacitance criterion, identifying a second search window of the touch-sensing surface, comprising a second set of unit cells, that extends from the first search window in only a same direction as the determined direction of travel of the conductive object; and performing a second scan of the second search window with at least one of a reduced scan rate or a reduced resolution to detect any additional changes in capacitance associated with the conductive object proximate to the touch-sensing surface within the second search window. - View Dependent Claims (5, 6, 7)
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Specification