Predictive touch surface scanning
First Claim
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1. A method comprising:
- determining a first resolved location of a conductive object proximate to a touch-sensing surface based on self-capacitance measurements of individual sensor electrodes of the touch-sensing surface in a self-capacitance mode;
measuring first self-capacitances of a first set of sensor electrodes of the individual sensor electrodes disposed in a first axis of the touch-sensing surface; and
measuring second self-capacitances of a second set of sensor electrodes of the individual sensor electrodes disposed in a second axis of the touch-sensing surface;
in response to determining the first resolved location of the conductive object, switching from operation in the self-capacitance mode to operation in a mutual capacitance mode; and
in response to determining the first resolved location of the conductive object, tracking a movement of the conductive object over the touch-sensing surface by determining a different resolved location of the conductive object for each of a plurality of consecutive mutual capacitance measurements of pairs of the sensor electrodes of the touch sensing surface while in the mutual capacitance mode, wherein performing each of the mutual capacitance measurements comprises measuring a mutual capacitance between at least one pair of the pairs of sensor electrodes of the touch-sensing surface,wherein the determining the first resolved location comprises;
determining that the conductive object is no longer present proximate to the touch-sensing surface during the mutual capacitance mode;
in response to the determining that the conductive object is no longer present during the mutual capacitance mode, switching from the operation in the mutual capacitance mode to the operation in the self-capacitance mode;
in response to the switching to the self-capacitance mode,measuring third self-capacitances of the first set of sensor electrodes to detect a second presence of the conductive object or a new conductive object proximate to the touch-sensing surface; and
measuring fourth self-capacitances of the second set of sensor electrodes only when the second presence is detected in the measuring the third self-capacitances.
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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 elements of the touch-sensing surface, wherein the subset of sensor elements is selected based on the predicted location of the conductive object.
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Citations
20 Claims
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1. A method comprising:
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determining a first resolved location of a conductive object proximate to a touch-sensing surface based on self-capacitance measurements of individual sensor electrodes of the touch-sensing surface in a self-capacitance mode; measuring first self-capacitances of a first set of sensor electrodes of the individual sensor electrodes disposed in a first axis of the touch-sensing surface; and measuring second self-capacitances of a second set of sensor electrodes of the individual sensor electrodes disposed in a second axis of the touch-sensing surface; in response to determining the first resolved location of the conductive object, switching from operation in the self-capacitance mode to operation in a mutual capacitance mode; and in response to determining the first resolved location of the conductive object, tracking a movement of the conductive object over the touch-sensing surface by determining a different resolved location of the conductive object for each of a plurality of consecutive mutual capacitance measurements of pairs of the sensor electrodes of the touch sensing surface while in the mutual capacitance mode, wherein performing each of the mutual capacitance measurements comprises measuring a mutual capacitance between at least one pair of the pairs of sensor electrodes of the touch-sensing surface, wherein the determining the first resolved location comprises; determining that the conductive object is no longer present proximate to the touch-sensing surface during the mutual capacitance mode; in response to the determining that the conductive object is no longer present during the mutual capacitance mode, switching from the operation in the mutual capacitance mode to the operation in the self-capacitance mode; in response to the switching to the self-capacitance mode, measuring third self-capacitances of the first set of sensor electrodes to detect a second presence of the conductive object or a new conductive object proximate to the touch-sensing surface; and measuring fourth self-capacitances of the second set of sensor electrodes only when the second presence is detected in the measuring the third self-capacitances. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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resolving an initial location of a conductive object proximate to a touch-sensing surface by performing self-capacitance measurements of the touch-sensing surface in a self-capacitance mode, wherein the touch-sensing surface comprises rows of sensor electrodes and columns of sensor electrodes; and determining a search window based on the resolved initial location; in response to resolving the initial location of the conductive object, switching from operation in the self-capacitance mode to operation in a mutual capacitance mode; in response to resolving the initial location of the conductive object, tracking a movement of the conductive object over the touch-sensing surface by determining a different resolved location of the conductive object for each of a plurality of consecutive mutual capacitance measurements of the search window while in the mutual capacitance mode, wherein performing each of the mutual capacitance measurements comprises measuring a capacitance between at least one pair of sensor electrodes of the touch-sensing surface; identifying that the conductive object is located at an edge of the search window or outside of the search window based on the mutual capacitance measurements; and when the conductive object is detected at the edge of the search window or outside of the search window, scanning at least one or more additional rows or columns of sensor electrodes that are adjacent to rows or columns within the search window without scanning an entire set of the rows and columns of sensor electrodes. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A touch-sensing system, comprising:
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a capacitive sensor array comprising a plurality of sensor electrodes; a capacitance sensor configured to measure a self-capacitance of each of the plurality of sensor electrodes in a self-capacitance mode and to measure a mutual capacitance for each intersection between pairs of sensor electrodes of the plurality of sensor electrodes in a mutual capacitance mode; and processing logic configured to, in response to determining a first resolved location of the conductive object using self-capacitance measurements of the plurality of sensor electrodes, switch from operation in the self-capacitance mode to operation in the mutual capacitance mode, and in response to determining the first resolved location of the conductive object using the self-capacitance measurements, track movement of the conductive object over the capacitive sensor array by determining a different resolved location of the conductive object for each of a plurality of consecutive mutual capacitance measurements of the pairs of the plurality of sensor electrodes of the capacitive sensor array while in the mutual capacitance mode, wherein performing each of the mutual capacitance measurements comprise comprises measuring a mutual capacitance between at least one pair of sensor electrodes of the capacitive sensor array, wherein the processing logic is further to; measure first self-capacitances of a first set of the plurality of sensor electrodes disposed in a first axis of the touch-sensing surface; and measure second self-capacitances of a second set of the plurality of sensor electrodes disposed in a second axis of the touch-sensing surface; determine that the conductive object is no longer present proximate to the touch-sensing surface during the mutual capacitance mode; in response to the conductive object is no longer being present during the mutual capacitance mode, switch from the operation in the mutual capacitance mode to the operation in the self-capacitance mode; in response to the switching to the self-capacitance mode, measure third self-capacitances of the first set of sensor electrodes to detect a second presence of the conductive object or a new conductive object proximate to the touch-sensing surface; and measure fourth self-capacitances of the second set of sensor electrodes only when the second presence is detected in the measuring the third self-capacitances. - View Dependent Claims (17, 18, 19, 20)
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Specification