Patent ID: 9417728
Filing Date: 2016-08-16
CPC Classification: G06F

Claim Text:
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.