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公开(公告)号：US11137858B2
公开(公告)日：2021-10-05
申请号：US15698471
申请日：2017-09-07
Applicant: Apple Inc.
Inventor： Albert Lin , Shwetabh Verma , Sumant Ranganathan
Abstract: Location-based swing compensation for touch sensor panels can improve touch sensing performance. Due to differences in impedance characteristics of touch nodes at different locations in a touch sensor panel (due to differences in routing to touch nodes and due to differences in impedance with respect to ground (loading effects) of touch nodes), touch nodes can have non-uniform bandwidth characteristics which can manifest as non-uniform signal and signal-to-noise ratio (SNR) across the touch sensor panel. Additionally, the non-uniform signal can reduce the effectiveness of bootstrapping. Swing compensated stimulation signals can be applied to various touch nodes based on location and/or impedance characteristics of the various touch nodes. For example, the stimulation voltage can be increased for touch nodes with longer and/or thinner routing traces so that the signal at the touch node can be uniform with other touch nodes whose routing may be shorter and/or thicker. In some examples, a touch sensing system can include a swing compensation memory including swing compensation parameters to select stimulation signal swing for transmit channels.
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公开(公告)号：US10067618B2
公开(公告)日：2018-09-04
申请号：US14869975
申请日：2015-09-29
Applicant: Apple Inc.
Inventor： Shwetabh Verma , Shahrooz Shahparnia , Sumant Ranganathan , Vivek Pant
CPC classification number: G06F3/044 , G06F1/3215 , G06F1/3262 , G06F3/0416 , G06F2203/04101
Abstract: Power consumption of touch sensing operations for touch sensitive devices can be reduced by implementing one or more coarse scans to coarsely detect the presence or absence of an object touching or proximate to a touch sensor panel and dynamically adjusting the operation of the touch sensitive device to perform or not perform one or more steps of a fine scan based on the results of the one or more coarse scans. In some examples, the fine scan can be scheduled, and one or more steps of the fine scan can be aborted when no touch is detected at touch sensors scanned during the one or more steps. Sense channels unused due to the aborted fine scan steps can be powered down during aborted fine scan steps.
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公开(公告)号：US10365773B2
公开(公告)日：2019-07-30
申请号：US15087956
申请日：2016-03-31
Applicant: Apple Inc.
Inventor： Marduke Yousefpor , Shwetabh Verma
Abstract: A touch controller for flexible scanning operation is disclosed. The touch controller can include circuitry configured to perform coarse detection scans, select a fine scan type based on results from the coarse detection scans, and perform a fine scan corresponding to the selected fine scan type. A fine mutual capacitance scan can be performed when conditions corresponding to a poorly grounded or ungrounded object or user are detected based on the coarse detection scans. A fine fully-bootstrapped self-capacitance scan can be performed when conditions corresponding to a well-grounded object or user are detected based on the coarse detection scans. A touch processor can be configured to sense touch events from the fine scan.
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