公开(公告)号：US12189899B2

公开(公告)日：2025-01-07

申请号：US17448879

申请日：2021-09-25

Applicant: Apple Inc.

Inventor： Andrew William Shorten ,  Sai Zhang ,  Andreas Johannes Koeberl ,  Eric S. Winokur ,  Liqun Yang ,  Sabino Joseph Pietrangelo, II ,  Branislav Jovanovic ,  Ari Y. Benbasat

IPC: G06F3/041 ,  G06F3/01 ,  G06F3/044

Abstract: Techniques for rejecting apparent (but false) touches caused by objects such as water droplets located in areas with parasitic capacitive paths to ground are disclosed. To minimize these false touches, one or more guard conductors can be located in proximity to the housing and driven with a stimulation signal to shield objects from being capacitively coupled to ground through the housing. In some examples images of touch can be obtained from a non-bootstrapped or bootstrapped scan and also an extended bootstrapped scan wherein the guard conductor is driven with a stimulation signal that has the same characteristics as the stimulation signal being applied to the sensed touch nodes. In some examples, the results of the extended bootstrapped scan can be subtracted from the non-bootstrapped or bootstrapped scan to identify and reject apparent touches resulting from capacitive coupling to ground.

公开(公告)号：US11157109B1

公开(公告)日：2021-10-26

申请号：US16786921

申请日：2020-02-10

Applicant: Apple Inc.

Inventor： Andrew William Shorten ,  Sai Zhang ,  Andreas Johannes Koeberl ,  Eric S. Winokur ,  Liqun Yang ,  Sabino Joseph Pietrangelo, II ,  Branislav Jovanovic ,  Ari Y. Benbasat

IPC: G06F3/041 ,  G06F3/01 ,  G06F3/044

Abstract: Techniques for rejecting apparent (but false) touches caused by objects such as water droplets located in areas with parasitic capacitive paths to ground are disclosed. To minimize these false touches, one or more guard conductors can be located in proximity to the housing and driven with a stimulation signal to shield objects from being capacitively coupled to ground through the housing. In some examples images of touch can be obtained from a non-bootstrapped or bootstrapped scan and also an extended bootstrapped scan wherein the guard conductor is driven with a stimulation signal that has the same characteristics as the stimulation signal being applied to the sensed touch nodes. In some examples, the results of the extended bootstrapped scan can be subtracted from the non-bootstrapped or bootstrapped scan to identify and reject apparent touches resulting from capacitive coupling to ground.