Active input sensing using regional scanning

An input device comprising:

• a plurality of sensor electrodes defining a sensing region;
• and
• a processing system configured to:
• divide the sensing region into a plurality of regions, wherein each region of the plurality of regions is partially overlapped by one or more other regions of the plurality of regions;
• detect, during at least a first active input sensing sub-period of a first sensing period comprising a touch sensing sub-period and at least one active input sensing sub-period, a presence of an active input device by a first sensor electrode of the plurality of sensor electrodes;
• select, based on a location of the first sensor electrode, a first region of the plurality of regions that includes the first sensor electrode;
• and
• determine, during at least a second active input sensing sub-period, a location of the active input device using sensor electrodes of the plurality of sensor electrodes that are included in the first region.

A processing system for operating a plurality of sensor electrodes defining a sensing region, the processing system comprising:

• sensor circuitry configured to:
• divide the sensing region into a plurality of regions, wherein each region of the plurality of regions is partially overlapped by one or more other regions of the plurality of regions;
• detect, during at least a first active input sensing sub-period of a first sensing period comprising a touch sensing sub-period and at least one active input sensing sub-period, a presence of an active input device by a first sensor electrode of the plurality of sensor electrodes;
• select, based on a location of the first sensor electrode, a first region of the plurality of regions that includes the first sensor electrode;
• and
• determine, during at least a second active input sensing sub-period, a location of the active input device using sensor electrodes of the plurality of sensor electrodes that are included in the first region.