公开(公告)号：US09811181B2

公开(公告)日：2017-11-07

申请号：US15052435

申请日：2016-02-24

申请人： Apple Inc.

发明人： Apexit Shah ,  Seyed M. Navidpour

IPC分类号： G06F3/0354

CPC分类号： G06F3/03545 ,  G06F3/0418

摘要： In one aspect, the present disclosure relates to a method and system for performing a noise correction technique including determining core electrodes and non-core electrodes, generating a noise estimate for each electrode based on electrodes that are at least an offset distance away from the electrode, correcting the signal at each electrode based on the noise estimate, and setting the corrected signal to zero if the corrected signal has a sign that is opposite the sign of the peak magnitude signal. By performing this method, noise induced on sense lines of a stylus by an LCD can be corrected for and accuracy of stylus positioning may be improved.

公开(公告)号：US10048777B2

公开(公告)日：2018-08-14

申请号：US15052445

申请日：2016-02-24

申请人： Apple Inc.

发明人： Apexit Shah ,  Ari Y. Benbasat

IPC分类号： G06F3/0354 ,  G06F3/044

摘要： In one aspect, the present disclosure relates to a method and system for performing an adaptive make/break detection technique including adapting make and break thresholds based on the sum of all signals measured on display electrodes when the sum is lower than a respective filtered sum value. The filtered sum values are produced by a fast and slow filter, which correspond to the break and make thresholds respectively. By performing this method, the accuracy of detecting stylus touch-down and lift-off from a display can be improved, even in the presence of confounding factors such as variation in stylus manufacture, user grip, stylus angle, and water on the display.

公开(公告)号：US09904379B2

公开(公告)日：2018-02-27

申请号：US15057058

申请日：2016-02-29

申请人： Apple Inc.

发明人： Blake R. Marshall ,  Apexit Shah ,  Ari Y. Benbasat ,  Li-Quan Tan ,  Priyanka Bhandari ,  Reza Nasiri Mahalati ,  Sarah M. Bolton

IPC分类号： G06F3/044 ,  G06F3/0354 ,  G06F3/041

CPC分类号： G06F3/03545 ,  G06F3/0418 ,  G06F3/044

摘要： A level of wear of a stylus tip can be estimated and in accordance with a determination that the level of wear of the stylus tip exceeds a threshold, the stylus input functionality of an electronic device can be disabled. The threshold can be set such that the stylus can be disabled before the stylus sensing performance degrades to a degree perceptible to a human and/or before exposing internal portions of the stylus that can scratch a touch screen. Additionally or alternatively, a notification can be provided to indicate to a user that the stylus tip should be replaced. In some examples, the estimated level of wear can also be used to provide warning notifications. Stylus tip wear can be estimated, for example, based on a detected total signal strength or based on an estimated total distance traversed by the stylus tip across a surface.

公开(公告)号：US11256367B2

公开(公告)日：2022-02-22

申请号：US16866473

申请日：2020-05-04

申请人： Apple Inc.

发明人： Mayank Garg ,  Apexit Shah

IPC分类号： G06F3/041

摘要： Grip detection can be beneficial for an electronic device to ignore unintended contacts on a touch sensitive surface. Examples of the disclosure provide various ways for identifying an input patch as a grip. In some examples, identifying an input patch as a grip comprises determining whether the input patch satisfies one or more grip identification criteria. In some examples, identified grips are saved in a grip database. In some examples, the identified grips are filtered out of touch images. In some examples, when baseline touch data for a touch-sensitive is updated, the touch processor can forgo updating the baseline for portions of the touch sensitive surface associated with the identified grips.

公开(公告)号：US10386965B2

公开(公告)日：2019-08-20

申请号：US15687078

申请日：2017-08-25

申请人： Apple Inc.

发明人： Apexit Shah ,  Ari Y. Benbasat

IPC分类号： G06F3/041 ,  G06F3/044 ,  G06K9/00 ,  G06K9/46

摘要： Touch input processing for touch-sensitive devices can be improved by filtering unintended contact detected on a touch-sensitive surface. In wet environments in particular, water on the touch-sensitive surface can be erroneously detected as touch input and degrade touch performance. In some examples, input patches can be classified as touch patches or non-touch patches prior to computationally-intensive touch processing. Filtering out unintended touches classified as non-touch patches can reduce processing requirements and save power. Additionally, classifying input patches can improve touch performance in wet environments. In some examples, input patches can be classified as touch patches or non-touch patches based on characteristics of edge touch nodes. In some examples, input patches can be classified as touch patches or non-touch patches based on a state-based signal threshold.