公开(公告)号：US20180088735A1

公开(公告)日：2018-03-29

申请号：US15698471

申请日：2017-09-07

Applicant: Apple Inc.

Inventor： Albert LIN ,  Shwetabh VERMA ,  Sumant RANGANATHAN

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G06F3/0412 ,  G06F3/044 ,  G06F2203/04108

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.

公开(公告)号：US20170090619A1

公开(公告)日：2017-03-30

申请号：US15087956

申请日：2016-03-31

Applicant: Apple Inc.

Inventor： Marduke YOUSEFPOR ,  Shwetabh VERMA

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416 ,  G06F3/0418

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.

公开(公告)号：US20190095006A1

公开(公告)日：2019-03-28

申请号：US16114023

申请日：2018-08-27

Applicant: Apple Inc.

Inventor： Shahrooz SHAHPARNIA ,  Christopher Tenzin MULLENS ,  Martin Paul GRUNTHANER ,  Adam GEBOFF ,  Vivek PANT ,  Marduke YOUSEFPOR ,  Christoph H. KRAH ,  Shwetabh VERMA ,  Sumant RANGANATHAN

IPC: G06F3/044 ,  G06F3/041 ,  G06F1/32

Abstract: Power consumption of touch sensing operations for touch sensitive devices can be reduced by implementing a coarse scan (e.g., banked common mode scan) to coarsely detect the presence or absence of an object touching or proximate to a touch sensor panel and the results of the coarse scan can be used to dynamically adjust the operation of the touch sensitive device to perform or not perform a fine scan (e.g., targeted active mode scan). In some examples, the results of the coarse scan can be used to program a touch controller for the next touch sensing frame to idle when no touch event is detected or to perform a fine scan when one or more touch events are detected. In some examples, the results of the coarse scan can be used to abort a scheduled fine scan during the current touch sensing frame when no touch event is detected.

公开(公告)号：US20160162011A1

公开(公告)日：2016-06-09

申请号：US14869975

申请日：2015-09-29

Applicant: Apple Inc.

Inventor： Shwetabh VERMA ,  Shahrooz SHAHPARNIA ,  Sumant RANGANATHAN ,  Vivek PANT

IPC: G06F1/32 ,  G06F3/041

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.

Abstract translation: 可以通过实施一个或多个粗略扫描来粗略地检测触摸或接近触摸传感器面板的物体的存在或不存在，并且动态地调整触敏设备的操作以执行触摸敏感设备的触摸感测操作的功耗 或者基于一个或多个粗略扫描的结果不执行精细扫描的一个或多个步骤。 在一些示例中，可以调度精细扫描，并且当在一个或多个步骤期间扫描的触摸传感器没有检测到触摸时，可以中止精细扫描的一个或多个步骤。 在中止的精细扫描步骤期间，由于中止的精细扫描步骤而未使用的感应通道可以关闭。