Adaptive touch sensing electrode

摘要

Techniques for varying aggregate area of a sensor electrode used for capacitive sensing. Sensor electrodes are driven for capacitive sensing. Resulting signals are received from the sensor electrodes. Based on signal strengths of the resulting signals, aggregate area of the sensor electrodes may be varied. The aggregate area of the sensor electrodes may be varied by connecting or disconnecting segments of the sensor electrodes from a sensor module that drives the sensor electrodes for capacitive sensing. The ability to vary the aggregate area of the sensor electrodes expands the overall dynamic range of a receiver module coupled to the sensor electrodes.

主权项

1. A processing system for an input device, the processing system comprising:
a sensor module comprising sensor circuitry configured to: drive a first number of a first plurality of segments comprising a first sensor electrode of a plurality of sensor electrodes of the input device to determine a first capacitive coupling between the first sensor electrode and an input object, and drive a second number of the first plurality of segments of the first sensor electrode to determine a second capacitive coupling between the first sensor electrode and the input object, in response to determining that the first capacitive coupling is outside of an operating range of the sensor module corresponding to the first number of segments, wherein the first number is different from the second number.