公开(公告)号：US20190025926A1

公开(公告)日：2019-01-24

申请号：US16140955

申请日：2018-09-25

Applicant: Apple Inc.

Inventor： Jonah A. Harley ,  Peteris K. Augenbergs ,  Patrick Kessler ,  Kenneth L. Staton ,  Dhaval Patel ,  Thomas W. Wilson, JR.

IPC: G06F3/01 ,  G06F3/041

Abstract: An electronic device including a processor, a display screen in communication with the processor, a track pad in communication with the processor including a movable surface that is selectively movable in at least one direction to provide feedback to a user, and a feedback system in communication with the processor including a feedback sensor. The feedback sensor determines a movement characteristic of the movable surface and the processor selectively adjusts at least one setting of the track pad based on the movement characteristic.

公开(公告)号：US09880664B2

公开(公告)日：2018-01-30

申请号：US14864351

申请日：2015-09-24

Applicant: Apple Inc.

Inventor： Manu Agarwal ,  Jason C. Hu ,  Dhaval Patel ,  Shahrooz Shahparnia ,  Sumant Ranganathan

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G06F3/0414 ,  G06F3/044 ,  G06F2203/04106

Abstract: Noise in sensor panel measurements can be reduced using a common pixel correction algorithm. Noise can be introduced into touch or force sensor panel measurements, for example, by circuitry of a transmit (Tx) section or a receive (Rx) section coupled to one or more sensing nodes of a sensor panel. For example, a digital-to-analog converter in the transmit section or an analog-to-digital converter in the receive section can introduce low-frequency correlated noise. Additionally, transmit and receive sections can introduce uncorrelated noise into the system. Reference nodes, coupled between Tx and Rx sections, can sense correlated and uncorrelated noise from the Tx and Rx sections. The noise measured at reference nodes can be subtract from signals measured at other sensing nodes coupled to the same Rx channel. The measurement at the reference node can be scaled using a scaling parameter to account for differences between reference nodes and sensing nodes.