Wide dynamic range capacitive sensing

摘要

A touch sensor panel configured to detect objects touching the panel as well as objects that are at a varying proximity to the touch sensor panel. The touch sensor panel includes circuitry that can configure the panel in a mutual capacitance (near field) architecture or a self-capacitance (far field and super far field) architecture. The touch sensor panel can also include circuitry that works to minimize an effect that a parasitic capacitance can have on the ability of the touch sensor panel to reliably detect touch and proximity events.

主权项

1. A method for determining an object sensing mode of a touch sensor panel, comprising:
at an electronic device with one or more processors and memory,
operating the touch sensor panel in a first object sensing mode having a first resolution and a first gain,if no first touch or proximity event is detected in the first object sensing mode, switching the touch sensor panel to operate in a second object sensing mode having a second resolution and a second gain greater than the first gain, andif no second touch or proximity event is detected in the second object sensing mode and the second gain is not a maximum gain, switching the touch sensor panel to operate in the second object sensing mode having a third gain greater than the second gain.