Patent ID: 9218073
Filing Date: 2015-12-22
Classification: G06F

Abstract:
1. An apparatus comprising: a stylus housing having an end; a transmit (TX) drive circuit disposed at least partially inside the stylus housing; a tip shield configured to be coupled to the TX drive circuit to receive a TX potential from the TX drive circuit; a conductive tip disposed at least partially inside the stylus housing and extending from the end, the conductive tip configured to receive the TX potential from the TX drive circuit and capacitively couple a transmit signal to a sense array when the tip shield is coupled to the TX drive circuit, when the tip shield is not coupled to the TX drive circuit, and without a change in contact between the conductive tip and a touch surface; a force sensor coupled to the conductive tip and configured to measure a force of a contact between the conductive tip and the touch surface; and a switch configured to electrically couple the tip shield to the conductive tip when the measured force of contact indicates that the conductive tip is not in contact with the touch surface.