公开(公告)号：US20180364841A1

公开(公告)日：2018-12-20

申请号：US16112141

申请日：2018-08-24

Applicant: Apple Inc.

Inventor： Shahrooz SHAHPARNIA ,  Christoph H. KRAH

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

Abstract: Self capacitance touch circuits to cancel the effects of parasitic capacitance in a touch sensitive device are disclosed. One circuit can generate a parasitic capacitance cancelation signal that can be injected into touch sensing circuitry to cancel the parasitic capacitance. Another circuit can adjust the phase and magnitude of the parasitic capacitance cancelation signal based on characteristics of channels in the touch sensing circuitry so as to fine tune the parasitic capacitance cancelations. Another circuit can drive a guard plate and touch panel electrodes so as to cancel the parasitic capacitances between the panel and the plate and between the electrodes.

公开(公告)号：US20170329441A1

公开(公告)日：2017-11-16

申请号：US15666169

申请日：2017-08-01

Applicant: Apple Inc.

Inventor： Christoph H. KRAH ,  Marduke YOUSEFPOR

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0418

Abstract: A concurrent touch and negative pixel scan performed at a touch panel is disclosed. The concurrent scan can include sensing an object proximate to the touch panel and sensing a negative pixel effect, based the object's grounding condition, at the touch panel, at the same time. As a result, sense signals indicative of the proximity of the object and coupling signals indicative of the negative pixel effect's magnitude can be captured concurrently. Because the negative pixel effect can cause errors or distortions in the sense signals, the coupling signals can be used to compensate the sense signals for the negative pixel effect.

公开(公告)号：US20160378171A1

公开(公告)日：2016-12-29

申请号：US15260257

申请日：2016-09-08

Applicant: Apple Inc.

Inventor： Christoph H. KRAH ,  Thomas James WILSON

IPC: G06F1/32

CPC classification number: G06F1/3287 ,  G06F1/3215 ,  G06F1/3262 ,  G06F1/3296 ,  G06F3/041 ,  G06F3/0416 ,  Y02D50/20

Abstract: Power management for a touch controller is disclosed. The touch controller can include a transmit section for transmitting stimulation signals to an associated touch sensor panel to drive the panel, where the touch controller can selectively adjust the transmit section to reduce power during the transmission. The touch controller can also include a receive section for receiving touch signals resulting from the driving of the panel, where the touch controller can selectively adjust the receive section to reduce power during the receipt of the touch signals. The touch controller can also include a demodulation section for demodulating the received touch signals to obtain touch event results, where the touch controller can selectively adjust the demodulation section to reduce power during the demodulation of the touch signals. The touch controller can also selectively reduce power below present low levels during idle periods. The touch controller can be incorporated into a touch sensitive device.

公开(公告)号：US20160283038A1

公开(公告)日：2016-09-29

申请号：US15176008

申请日：2016-06-07

Applicant: Apple Inc.

Inventor： Christoph H. KRAH ,  Minh-Dieu Thi VU ,  Thomas James WILSON

IPC: G06F3/041 ,  G06F3/044

Abstract: A system and method for autonomously scanning a sensor panel device is disclosed. A sensor panel processor can be disabled after a first predetermined amount of time has elapsed without the sensor panel device sensing any events. One or more system clocks can also be disabled to conserve power. While the processor and one or more system clocks are disabled, the sensor panel device can periodically autonomously scan the sensor panel for touch activity. If one or more results from the autonomous scans exceed a threshold, the sensor panel device re-enables the processor and one or more clocks to actively scan the sensor panel. If the threshold is not exceeded, the sensor panel device continues to periodically autonomously scan the sensor panel without intervention from the processor. The sensor panel device can periodically perform calibration functions to account for any drift that may be present in the system.

Abstract translation: 公开了一种用于自主扫描传感器面板装置的系统和方法。 传感器面板处理器可以在经过第一预定量的时间之后被禁用，而传感器面板装置不会感测任何事件。 还可以禁用一个或多个系统时钟来节省电力。 当处理器和一个或多个系统时钟被禁用时，传感器面板设备可以周期性地自动扫描传感器面板以进行触摸活动。 如果自主扫描的一个或多个结果超过阈值，则传感器面板设备重新启用处理器和一个或多个时钟来主动扫描传感器面板。 如果不超过阈值，则传感器面板设备将继续周期性地自动扫描传感器面板而无需处理器的介入。 传感器面板设备可以周期性地执行校准功能，以解决系统中可能存在的漂移。

公开(公告)号：US20150261285A1

公开(公告)日：2015-09-17

申请号：US14715351

申请日：2015-05-18

Applicant: Apple Inc.

Inventor： Thomas James WILSON ,  Christoph H. KRAH

IPC: G06F1/32 ,  G06F3/041

CPC classification number: G06F1/3262 ,  G06F3/0418 ,  G06F3/044 ,  H04L27/2626 ,  H04L27/2647 ,  H04M11/062

Abstract: Automatic low noise frequency selection for a touch sensitive device is disclosed. A low noise stimulation frequency can be automatically selected by device logic without intervention of the device processor to stimulate the device to sense a touch event at the device. The device logic can automatically select a set of low noise frequencies from among various frequencies based on the amount of noise introduced by the device at the various frequencies, where the frequencies with the lower noise amounts can be selected. The device logic can also automatically select a low noise frequency from among the selected set as the low noise stimulation frequency. The device logic can be implemented partially or entirely in hardware.

Abstract translation: 公开了用于触敏设备的自动低噪声频率选择。 低噪声刺激频率可以由设备逻辑自动选择，而无需设备处理器的干预，以刺激设备感测设备上的触摸事件。 设备逻辑可以根据设备在各种频率下引入的噪声量从各种频率中自动选择一组低噪声频率，其中可以选择具有较低噪声量的频率。 设备逻辑还可以自动选择所选集合中的低噪声频率作为低噪声刺激频率。 设备逻辑可以部分或全部以硬件实现。