Systems and methods of improved water detection on a touch-sensitive display using directional scanning techniques

A touch-sensitive device, comprising:

• a touch-sensitive array that includes a plurality of sensor electrodes;
• one or more processors;
• and
• memory storing one or more programs, the one or more programs including instructions, which when executed by the one or more processors cause the touch-sensitive device to:
• perform a plurality of scans of the touch-sensitive array using at least two different scan patterns, wherein the plurality of scans captures response data for at least a subset of the plurality of sensor electrodes;
• determine a signal direction for each sensor electrode in the subset using the response data, wherein the signal direction for each sensor electrode indicates a relative location of a sensor electrode in the subset most responsible for creation of the signal direction;
• identify one or more touch zones, each comprising a group of sensor electrodes with signal directions that point towards a peak electrode response included in the group, wherein the peak electrode response indicates a location of a candidate touch object on the touch-sensitive array;
• and
• for each identified touch zone:
• contribute electrode responses from the group of sensor electrodes in the touch zone to the peak electrode response for the touch zone, and
• report a touch object at the location associated with the peak electrode response in accordance with a determination that the contributed peak electrode response for the touch zone satisfies a predefined response threshold.

A non-transitory computer-readable storage medium, storing one or more programs configured for execution by one or more processors of a touch-sensitive device having a touch-sensitive array that includes a plurality of sensor electrodes, the one or more programs including instructions for:

• performing a plurality of scans of the touch-sensitive array using at least two different scan patterns, wherein the plurality of scans captures response data for at least a subset of the plurality of sensor electrodes;
• determining a signal direction for each sensor electrode in the subset using the response data, wherein the signal direction for each sensor electrode indicates a relative location of a sensor electrode in the subset most responsible for creation of the signal direction;
• identifying one or more touch zones, each comprising a group of sensor electrodes with signal directions that point towards a peak electrode response included in the group, wherein the peak electrode response indicates a location of a candidate touch object on the touch-sensitive array;
• and
• for each identified touch zone:
• contributing electrode responses from the group of sensor electrodes in the touch zone to the peak electrode response for the touch zone, and
• reporting a touch object at the location associated with the peak electrode response in accordance with a determination that the contributed peak electrode response for the touch zone satisfies a predefined response threshold.