Patent ID: 8723825
Filing Date: 2014-05-13
Classification: G06F

Abstract:
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.