公开(公告)号：US20220382409A1

公开(公告)日：2022-12-01

申请号：US17818250

申请日：2022-08-08

Applicant: Apple Inc.

Inventor： Shahrooz SHAHPARNIA ,  Christoph H. KRAH

IPC: G06F3/041 ,  G06F3/044

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：US20220057897A1

公开(公告)日：2022-02-24

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.

公开(公告)号：US20210240304A1

公开(公告)日：2021-08-05

申请号：US17170384

申请日：2021-02-08

Applicant: Apple Inc.

Inventor： Steven P. HOTELLING ,  Christoph H. KRAH ,  Brian Q. HUPPI

IPC: G06F3/044 ,  G06F3/041

Abstract: A multipoint touch surface controller is disclosed herein. The controller includes an integrated circuit including output circuitry for driving a capacitive multi-touch sensor and input circuitry for reading the sensor. Also disclosed herein are various noise rejection and dynamic range enhancement techniques that permit the controller to be used with various sensors in various conditions without reconfiguring hardware.

公开(公告)号：US20210064165A1

公开(公告)日：2021-03-04

申请号：US17080723

申请日：2020-10-26

Applicant: Apple Inc.

Inventor： Christoph H. KRAH ,  Du CHEN

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

Abstract: Some touch screens can be formed by at least partially integrating touch sensing circuitry into a display pixel stackup. In some examples, noise can be introduced into touch sensor panel measurements, for example, from display data lines of a display device proximate to the touch sensor panel. In some examples, rows or columns of touch electrodes can be split and a first portion of the touch sensor panel can be stimulated to measure capacitance and noise and a second portion of the touch sensor panel can be unstimulated and measure noise. In some examples, both the first and the second portions of the touch sensor panel can be stimulated using orthogonal stimulation codes. In some examples, measurements from the first and/or second portions of the touch sensor panel can be subtracted from measurements from the other portion of the touch sensor panel to eliminate or reduce common mode noise.

公开(公告)号：US20200019265A1

公开(公告)日：2020-01-16

申请号：US16581721

申请日：2019-09-24

Applicant: Apple Inc.

Inventor： Christoph H. KRAH ,  Christian M. SAUER

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

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.

公开(公告)号：US20190073061A1

公开(公告)日：2019-03-07

申请号：US16179565

申请日：2018-11-02

Applicant: Apple Inc.

Inventor： Christoph H. KRAH ,  Christian M. SAUER

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

CPC classification number: G06F3/044 ,  G02F1/13338 ,  G02F1/1343 ,  G06F3/0412 ,  G06F3/0418

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.

公开(公告)号：US20160282998A1

公开(公告)日：2016-09-29

申请号：US15179909

申请日：2016-06-10

Applicant: Apple Inc.

Inventor： Steven P. HOTELLING ,  Christoph H. KRAH

IPC: G06F3/044 ,  G06F3/041 ,  G06F1/32 ,  G06F3/042

CPC classification number: G06F3/044 ,  G06F1/3231 ,  G06F1/3262 ,  G06F3/017 ,  G06F3/0227 ,  G06F3/041 ,  G06F3/0416 ,  G06F3/042 ,  G06F3/0421 ,  G06F3/0488 ,  G06F2203/04101 ,  G06F2203/04104 ,  G06F2203/04106 ,  G06F2203/04808 ,  Y02B70/30 ,  Y02B70/32 ,  Y02D10/173

Abstract: The use of one or more proximity sensors in combination with one or more touch sensors in a multi-touch panel to detect the presence of a finger, body part or other object and control or trigger one or more functions in accordance with an “image” of touch provided by the sensor outputs is disclosed. In some embodiments, one or more infrared (IR) proximity sensors can be driven with a specific stimulation frequency and emit IR light from one or more areas, which can in some embodiments correspond to one or more multi-touch sensor “pixel” locations. The reflected IR signal, if any, can be demodulated using synchronous demodulation. In some embodiments, both physical interfaces (touch and proximity sensors) can be connected to analog channels in the same electrical core.

公开(公告)号：US20150097780A1

公开(公告)日：2015-04-09

申请号：US14570915

申请日：2014-12-15

Applicant: Apple Inc.

Inventor： Steven P. HOTELLING ,  Christoph H. KRAH

IPC: G06F3/02 ,  G06F3/01 ,  G06F1/32 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F1/3231 ,  G06F1/3262 ,  G06F3/017 ,  G06F3/0227 ,  G06F3/041 ,  G06F3/0416 ,  G06F3/042 ,  G06F3/0421 ,  G06F3/0488 ,  G06F2203/04101 ,  G06F2203/04104 ,  G06F2203/04106 ,  G06F2203/04808 ,  Y02B70/30 ,  Y02B70/32 ,  Y02D10/173

Abstract: The use of one or more proximity sensors in combination with one or more touch sensors in a multi-touch panel to detect the presence of a finger, body part or other object and control or trigger one or more functions in accordance with an “image” of touch provided by the sensor outputs is disclosed. In some embodiments, one or more infrared (IR) proximity sensors can be driven with a specific stimulation frequency and emit IR light from one or more areas, which can in some embodiments correspond to one or more multi-touch sensor “pixel” locations. The reflected IR signal, if any, can be demodulated using synchronous demodulation. In some embodiments, both physical interfaces (touch and proximity sensors) can be connected to analog channels in the same electrical core.

公开(公告)号：US20140306913A1

公开(公告)日：2014-10-16

申请号：US14315162

申请日：2014-06-25

Applicant: Apple Inc.

Inventor： Christoph H. KRAH

IPC: G06F3/041

CPC classification number: G06F3/041 ,  G06F3/0416 ,  G06F3/044

Abstract: Determining a compensated phase matrix for a multi-stimulus demodulation process is provided. A first drive line of a multi-stimulus sensing system is selected, and a stimulation signal is transmitted on the selected drive line. A channel gain resulting from the stimulation signal is measured from a received sense signal resulting from the stimulation signal. The measured channel gain is compared with a known channel gain to obtain an individual phase compensation for the selected drive line. A compensated phase matrix is formed of the individual phase compensation values for multiple drive lines.

Abstract translation: 提供了用于多激励解调过程的补偿相位矩阵。 选择多刺激感测系统的第一驱动线，并且在所选择的驱动线上传送刺激信号。 从刺激信号产生的接收感测信号测量由刺激信号产生的通道增益。 将测量的信道增益与已知的信道增益进行比较，以获得所选驱动线路的单相补偿。 补偿相位矩阵由多个驱动线路的各个相位补偿值形成。

公开(公告)号：US20230280864A1

公开(公告)日：2023-09-07

申请号：US18317894

申请日：2023-05-15

Applicant: Apple Inc.

Inventor： Du CHEN ,  Christoph H. KRAH

IPC: G06F3/041 ,  G06F3/044 ,  G06F1/3296 ,  G06F1/3234

CPC classification number: G06F3/04184 ,  G06F3/0443 ,  G06F1/3296 ,  G06F1/3262 ,  G06F3/0446 ,  G06F2203/04107 ,  G06F3/044

Abstract: An electronic device can be configured to operate in a plurality of operating modes to generate various stimulation signals for touch sensing operations. Switching circuitry can selectively couple one or more stimulation circuits to touch stimulation circuitry to reduce electromagnetic interference generated during transitions between the plurality of operating modes. The electronic device can transition from a stimulation phase to a termination phase at an arbitrary time, unconstrained by integration time requirements of accompany touch sensing circuitry.