公开(公告)号：US20220011920A1

公开(公告)日：2022-01-13

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 ,  G06F3/044 ,  G06F3/01

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：US20240077965A1

公开(公告)日：2024-03-07

申请号：US18450771

申请日：2023-08-16

Applicant: Apple Inc.

Inventor： Dor SHAVIV ,  Behrooz SHAHSAVARI ,  David S. GRAFF ,  Baboo V. GOWREESUNKER ,  Nima FERDOSI ,  Yash S. AGARWAL ,  Sai ZHANG

IPC: G06F3/041

CPC classification number: G06F3/0412 ,  G06F3/04186 ,  G06F2203/04101

Abstract: Touch sensor panels/screens can include a first region having a plurality of touch electrodes and a second region without touch electrodes. In some examples, to improve touch sensing performance, a first algorithm or a second algorithm is applied to determine whether an object corresponding to the touch patch is in contact with the touch screen. Whether to apply the first algorithm or the second algorithm is optionally dependent on the location of the touch patch.

公开(公告)号：US20190079613A1

公开(公告)日：2019-03-14

申请号：US15701069

申请日：2017-09-11

Applicant: Apple Inc.

Inventor： Sai ZHANG ,  Branislav JOVANOVIC ,  Sean E. O'CONNOR ,  Ari Y. BENBASAT

IPC: G06F3/041 ,  G06F3/044 ,  G02F1/1333 ,  G02F1/1343

Abstract: A touch sensitivity of a touch-sensitive surface can be adjusted based on a state of a device including the touch-sensitive surface. The state of the device can be a first state (e.g., a grounding condition unknown or inferred to be poorly-grounded) or a second state (e.g., grounding condition inferred to be well-grounded). In the first state, for example, the touch sensing system of the device can be programmed to recognize and process a wide range of touch signals including relatively weak touch signals, which may correspond to water, liquid or other unintentional touches. In the second state, for example, the touch detection threshold can be adjusted to better reject water or unintended touches in the second state. In some examples, a ratio of measurements captured using the different types of scans of a selected touch node can be used to determine the state of the device.