公开(公告)号：US09836158B2

公开(公告)日：2017-12-05

申请号：US14631564

申请日：2015-02-25

Applicant: Apple Inc.

Inventor： Brian Michael King ,  Omar S. Leung ,  Paul G. Puskarich ,  Jeffrey Traer Bernstein ,  Andrea Mucignat ,  Avi E. Cieplinski ,  Muhammad Umar Choudry ,  Praveen R. Subramani ,  Marc J. Piche ,  David Amm ,  Duncan Robert Kerr

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/0416 ,  G06F3/0418 ,  G06F3/044 ,  G06F2203/04101 ,  G06F2203/04106 ,  G06F2203/04108 ,  G06F2203/04111

Abstract: Compensation for sensors in a touch and hover sensing device is disclosed. Compensation can be for sensor resistance and/or sensor sensitivity variation that can adversely affect touch and hover measurements at the sensors. To compensate for sensor resistance, the device can gang adjacent sensors together so as to reduce the overall resistance of the sensors. In addition or alternatively, the device can drive the sensors with voltages from multiple directions so as to reduce the effects of the sensors' resistance. To compensate for sensor sensitivity variation (generally at issue for hover measurements), the device can apply a gain factor to the measurements, where the gain factor is a function of the sensor location, so as to reduce the sensitivity variation at different sensor locations on the device.