Patent ID: 9069405
Filing Date: 2015-06-30
Classification: G06F

Abstract:
1. A method comprising: while operating in a self capacitance mode, determining a presence of at least one conductive object proximate to a touch-sensing surface by performing a first scan to obtain a search measurement of a first set of sensor elements of a plurality of sensor elements of the touch-sensing surface, wherein the plurality of sensor elements comprises a plurality of column sensor elements and a plurality of row sensor elements, wherein the performing first scan comprises measuring one or more self capacitance values for the first set to determine the presence of the at least one conductive object without regard to determining a location of the at least one conductive object on the touch-sensing surface, wherein the first set comprises at least one of 1) only the plurality of column sensor elements, 2) only the plurality of row sensor elements, or 3) only a combination of alternating row sensor elements and alternating column sensor elements; repeating the performing the first scan until the at least one conductive object is proximate to the touch-sensing surface; in response to determining the presence of the at least one conductive object based on the first scan, performing a second scan to obtain a measurement of a second set of sensor elements of the touch-sensing surface, wherein the second set comprises only the plurality of row sensor elements when the first set comprises 1), wherein the second set comprises only the plurality of column sensor elements when the first set comprises 2), wherein the second set comprise only a different combination of alternating row sensor elements and alternating column sensor elements when the first set comprises 3), wherein performing the second scan comprises measuring self capacitance values for the second set; and in response to the second scan, switching from operating in the self capacitance mode to operating in a mutual capacitance mode, and while operating in the mutual capacitance mode, performing a third scan to obtain a tracking measurement of a third set of sensor elements of the touch-sensing surface to determine a location of the at least one conductive object, wherein the performing the third scan comprises measuring a mutual capacitance between at least one pair of sensor elements of the third set of sensor elements wherein the third set of sensor elements comprise at least one of the plurality of row sensor elements and at least one of the plurality of column sensor elements.