TOUCH SENSITIVE DEVICE USING THRESHOLD VOLTAGE SIGNAL

摘要

A touch sensitive apparatus having a plurality of drive electrodes and a plurality of receive electrodes, the drive electrodes and receive electrodes capacitively coupled to each other. A touch measurement circuit configured to identify touch events on the touch sensitive device by comparing a first time period to a second time period. The first time period can be, for example, representative of a length of time a periodic receive signal carried by a receive electrode is above or below a threshold voltage level.