Hybrid in-cell sensor topology

A processing system for an input device, the processing system comprising:

• sensing circuitry configured to couple with a plurality of first sensor electrodes and a plurality of second sensor electrodes,
• the plurality of first sensor electrodes arranged with a first sensor pitch at a first layer of the input device, each first sensor electrode comprising at least one display electrode of a plurality of display electrodes,
• the plurality of second sensor electrodes arranged with a second sensor pitch at a second layer between a display activation layer and a lens layer of the input device, the second sensor pitch greater than the first sensor pitch along at least one dimension of a sensing region of the input device,
• wherein the sensing circuitry is further configured to:
• operate the plurality of second sensor electrodes in a first predefined sensing mode by:
• driving the plurality of second sensor electrodes with first capacitive sensing signals;
• and
• determining at least a presence or absence of an input object in a sensing region of the input device, wherein each first sensor electrode and each second sensor electrode has a substantially equilateral profile within first and second dimensions of the sensing region, and wherein the substantially equilateral profile of each second sensor electrode entirely overlaps the substantially equilateral profiles of multiple first sensor electrodes of the plurality of first sensor electrodes;
• and
• operate, based on a determination of the presence of the input object in the sensing region, the plurality of first sensor electrodes in a second predefined sensing mode by:
• determining an initial location of the input object in two or more dimensions of the sensing region by identifying one or more second sensor electrodes of the plurality of second sensor electrodes that determined the presence of the input object;
• and
• driving a portion of the plurality of first sensor electrodes with second capacitive sensing signals to determine a refined location of the input object in the two or more dimensions,
• wherein the portion comprises one or more first sensor electrodes that overlap with the identified one or more second sensor electrodes.

A method of operating an input device comprising a plurality of layers and defining a sensing region, the plurality of layers comprising a lens layer and a display activation layer, the method comprising:

• operating a plurality of coarse-pitch sensor electrodes in a first predefined sensing mode by driving the coarse-pitch sensor electrodes with first capacitive sensing signals to determine at least a presence or absence of an input object in the sensing region, the coarse-pitch sensor electrodes disposed at a first layer of the plurality of layers;
• and
• operating, based on a determination of the presence of the input object in the sensing region, a plurality of fine-pitch sensor electrodes in a second predefined sensing mode by:
• determining an initial location of the input object in two or more dimensions of the sensing region by identifying one or more coarse-pitch sensor electrodes of the plurality of coarse-pitch sensor electrodes that determined the presence of the input object;
• and
• driving a portion of the plurality of fine-pitch sensor electrodes with second capacitive sensing signals to determine a refined location of the input object in the two or more dimensions,
• wherein each coarse-pitch sensor electrode and each fine-pitch sensor electrode has a substantially equilateral profile within the two or more dimensions, and wherein the substantially equilateral profile of each coarse-pitch sensor electrode entirely overlaps the substantially equilateral profiles of multiple fine-pitch sensor electrodes,
• wherein the portion comprises one or more fine-pitch sensor electrodes that overlap with the identified one or more coarse-pitch sensor electrodes, and
• wherein the plurality of fine-pitch sensor electrodes is disposed at a second layer of the plurality of layers between the display activation layer and the lens layer.