MULTIPOINT TOUCH SURFACE CONTROLLER

摘要

A multipoint touch surface controller is disclosed herein. The controller includes an integrated circuit including output circuitry for driving a capacitive multi-touch sensor and input circuitry for reading the sensor. Also disclosed herein are various noise rejection and dynamic range enhancement techniques that permit the controller to be used with various sensors in various conditions without reconfiguring hardware.

主权项

1. A method of detecting inputs on a touch sensor panel including a plurality of touch nodes formed at intersections of a plurality of drive electrodes and a plurality of sense electrodes, comprising:
acquiring a first capacitance image of the touch sensor panel in response to stimulating the drive electrodes with a first periodic waveform having a first predetermined frequency and measuring capacitive couplings of the stimulated drive electrodes and at least one of the sense electrodes; acquiring a second capacitance image of the touch sensor panel in response to stimulating the drive electrodes with a second periodic waveform having a second predetermined frequency and measuring capacitive couplings of the stimulated drive electrodes and at least one of the sense electrodes; and determining a location of at least one touch based on the acquired first capacitance image and second capacitance image.