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    Balanced mutual capacitance systems and methods
    3.
    发明授权
    Balanced mutual capacitance systems and methods 有权

    公开(公告)号：US11614839B2

    公开(公告)日：2023-03-28

    申请号：US16998456

    申请日：2020-08-20

    Applicant: Apple Inc.

    Inventor： William Matthew Pender Paul ,  Christoph H. Krah ,  Bin Huang ,  Stanley Bo-Ting Wang

    IPC: G06F3/044 ,  G06F3/041

    Abstract: In some examples, a touch screen can include touch electrodes that can function as drive (Tx) electrodes and sense (Rx) electrodes during a touch sensing operation of the electronic device. The drive electrodes can include +Tx electrodes and −Tx electrodes that can receive drive signals that can have the same amplitude and frequency and opposite phases, for example. In some examples, the surface areas of the +Tx electrodes and the −Tx electrodes can be the same and the distances of the +Tx electrodes and −Tx electrodes from the Rx electrodes can be different. In some examples, the total charge coupled to a proximate or touching object can be zero, which can mitigate problems associated with ungrounded or poorly grounded objects in contact with the touch screen.

    Multi modal touch controller
    4.
    发明授权
    Multi modal touch controller 有权

    公开(公告)号：US11086463B2

    公开(公告)日：2021-08-10

    申请号：US16134651

    申请日：2018-09-18

    Applicant: Apple Inc.

    Inventor： Christoph H. Krah

    IPC: G06F3/044 ,  G06F3/041 ,  G06F1/16

    Abstract: A multi-modal touch controller configured to operate in different modes. In some examples, the multi-modal touch controller can be operated in a first mode corresponding to a guarded self-capacitance scan. In some examples, the multi-modal touch controller can be operated in a second mode corresponding to offset-compensated mutual capacitance scan. In some examples, the multi-modal controller can be operated in a third mode corresponding to a mutual and self-capacitance scan. The multi-modal touch controller can advantageously allow one touch sensing chipset to be used across different types of guarded touch sensor panels and across different modes of operation.

    Noise mitigation touch sensing circuit
    5.
    发明授权
    Noise mitigation touch sensing circuit 有权

    公开(公告)号：US11079878B1

    公开(公告)日：2021-08-03

    申请号：US16926421

    申请日：2020-07-10

    Applicant: Apple Inc.

    Inventor： Christoph H. Krah

    IPC: G06F3/041 ,  G06F3/044 ,  H03F3/45 ,  H03H7/06

    Abstract: Techniques for mitigating noise in a touch signal are disclosed. To reduce or eliminate noise in a touch signal, the touch activity can be filtered out of a touch signal, thus isolating the noise. In some examples, the noise is then provided to the non-inverting input port of a differential amplifier while the unfiltered touch signal is provided to the inverting input port of the differential amplifier. The noise, which is now common on both inputs, is automatically eliminated or reduced by the differential amplifier.

    Displays With Optical Edge Sensors
    6.
    发明申请
    Displays With Optical Edge Sensors 有权

    公开(公告)号：US20210098537A1

    公开(公告)日：2021-04-01

    申请号：US16940192

    申请日：2020-07-27

    Applicant: Apple Inc.

    Inventor： Christoph H. Krah ,  Mohammad Yeke Yazdandoost

    IPC: H01L27/32 ,  G06F3/041 ,  G06F3/044

    Abstract: A display may have an array of light-emitting pixels that display an image in an active area of the display. These light-emitting pixels may be visible light pixels such as red, green, and blue thin-film organic light-emitting diode pixels. The display may also have a border region that runs along a peripheral edge of the active area. The border region may be free of pixels that display image light, whereas the active area may be free of light detectors. A non-optical touch sensor such as a capacitive touch sensor may overlap the active area to gather touch input from the active area. The non-optical touch sensor may not overlap any portion of the border region. In the border region, an optical sensor formed from infrared light-emitting pixels and infrared light-sensing pixels or other optical sensing circuitry may serve as an optical touch sensor.

    Touch sensor panel with multi-power domain chip configuration
    7.
    发明授权
    Touch sensor panel with multi-power domain chip configuration 有权

    公开(公告)号：US10852894B2

    公开(公告)日：2020-12-01

    申请号：US16581721

    申请日：2019-09-24

    Applicant: Apple Inc.

    Inventor： Christoph H. Krah ,  Christian M. Sauer

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

    Abstract: A touch sensing system is disclosed. The touch sensing system includes a guard signal generation chip operating in a first power domain referenced to a first voltage, the guard signal generation chip configured to generate a guard signal. A touch sensing chip operates in a second power domain, different from the first power domain, referenced to the guard signal, the touch sensing chip configured to sense touch at one or more touch electrodes included in a touch sensor panel operating in the second power domain referenced to the guard signal, and the touch sensing chip a different chip than the guard signal generation chip. A voltage regulator is configured to selectively regulate a voltage of the guard signal at the touch sensing chip.

    Systems and methods for pre-charging a display panel
    8.
    发明授权
    Systems and methods for pre-charging a display panel 有权

    公开(公告)号：US10175830B2

    公开(公告)日：2019-01-08

    申请号：US14870815

    申请日：2015-09-30

    Applicant: Apple Inc.

    Inventor： Taif A. Syed ,  Kingsuk Brahma ,  Christoph H. Krah

    IPC: G06F3/041 ,  G06F3/044

    Abstract: A method for pre-charging a display panel may include simultaneously charging the display panel that displays image data and receives one or more touch inputs via a first voltage source and a capacitor that provides a first voltage to the display panel via a second voltage source. The first voltage is associated with receiving the one or more touch inputs, and the display panel and the capacitor are simultaneously charged for a first amount of time. The method may then include charging the display panel via the capacitor after the first amount of time for a second amount of time and charging the display panel via the second voltage source after the second amount of time for a third amount of time.

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