PARASITIC CAPACITANCE FILTER FOR SINGLE-LAYER CAPACITIVE IMAGING SENSORS

摘要

An approach is provided for estimating and correcting parasitic responses of a touch sensor device. The input device measures a first capacitance signal generated by a first pixel that is covered at least partially by an input object. The input device measures a second capacitance signal generated by a second pixel that is covered at least partially by the input object. The input device measures a third capacitance signal generated by a third pixel. Based on at least the first capacitance signal and the second capacitance signal, the input device identifies a position of the input object within the sensing region. Based on the position of the input object, the input device identifies a trace covered by the input object and associated with the third pixel. The input device calculates an updated third capacitance signal by subtracting a correction amount from the third capacitance signal.

主权项

1. A computer-implemented method of sensing a position of an input object, comprising:
determining a first pixel response of a first pixel covered at least partially by an input object; determining a second pixel response of a second pixel covered at least partially by the input object; determining a third pixel response of a third pixel, wherein the first pixel, the second pixel, and the third pixel are disposed within a capacitive sensing region of a touch sensor device; based on at least the first pixel response and the second pixel response, identifying a position of the input object within the capacitive sensing region; based on the position of the input object, determining that the input object is positioned near a first trace, wherein the first trace is associated with the third pixel; and calculating an updated third pixel response by removing a correction amount from the third pixel response after determining that the input object is positioned near the first trace.