SCAN SEQUENCE GENERATOR

摘要

A sensor panel device that can generate and use a stimulus signal having multiple different waveforms for detecting events on or near the sensor panel is disclosed. Among other things, such a stimulus signal can be used to reject environmental noise present in the device. In some embodiments, the stimulus signal has multiple waveforms having different frequencies. Logic circuitry can generate representative values from output of the different waveforms applied to one or more sensing nodes in the sensor panel device. From the representative values, a final value can be generated that represents whether an event occurred at or near the one or more sensing nodes.

主权项

1. A method of detecting events with a touch sensor panel device comprising:
applying a first stimulation signal having multiple different frequencies to a first touch sensing node of the touch sensor panel device to detect a position of touch, near touch or hover location of an object at or near the first touch sensing node; while applying the first stimulation signal, sensing an output of the first touch sensing node for each of the multiple different frequencies of the first stimulation signal that was applied to the first touch sensing node to thereby provide multiple outputs; determining a final result based on all or a plurality of the multiple outputs of the first touch sensing node; utilizing the final result to determine the position of touch, near touch or hover location on the touch sensor panel device; and determining the multiple different frequencies of the first stimulation signal in a random manner from a group of different frequency values.