公开(公告)号：US20230217781A1

公开(公告)日：2023-07-06

申请号：US18181928

申请日：2023-03-10

Applicant: Apple Inc.

Inventor： Christoph H. Krah ,  Mohammad Yeke Yazdandoost

IPC: G06F3/042 ,  G06F3/01 ,  G06F3/041 ,  G06F3/044 ,  H10K59/65

CPC classification number: G06F3/0428 ,  G06F3/017 ,  G06F3/0416 ,  G06F3/0412 ,  G06F3/0446 ,  G06F3/0421 ,  H10K59/65 ,  G06F2203/04106 ,  G06F2203/04108

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.

公开(公告)号：US11662867B1

公开(公告)日：2023-05-30

申请号：US17306318

申请日：2021-05-03

Applicant: Apple Inc.

Inventor： Christoph H. Krah ,  Jesse Michael Devine ,  Xiaoqi Zhou

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0446 ,  G06F3/0445

Abstract: Some touch screens can be formed with rows and columns of touch electrodes. In some examples, during a first time period, a first set of row electrodes are driven while a second set of row electrodes are sensed. In some examples, during a second time period, the first set of row electrodes are sensed while the second set of row electrodes are driven. In some examples, during a third time period, a first set of column electrodes are driven while a second set of column electrodes are sensed. In some examples, during a fourth time period, the first set of column electrodes are sensed while the second set of column electrodes are driven. In some examples, a touch image can be generated based on the data sensed from the first, second, third, and fourth time periods.

公开(公告)号：US11409353B2

公开(公告)日：2022-08-09

申请号：US16112141

申请日：2018-08-24

Applicant: Apple Inc.

Inventor： Shahrooz Shahparnia ,  Christoph H. Krah

IPC: G06F1/3234 ,  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：US11199933B2

公开(公告)日：2021-12-14

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：US11194423B2

公开(公告)日：2021-12-07

申请号：US16911212

申请日：2020-06-24

Applicant: Apple Inc.

Inventor： Christoph H. Krah ,  Minh-Dieu Thi Vu ,  Thomas James Wilson

IPC: G09G5/00 ,  G06F3/041 ,  G06F1/3203 ,  G06F1/3234 ,  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.

公开(公告)号：US10541280B1

公开(公告)日：2020-01-21

申请号：US15706411

申请日：2017-09-15

Applicant: Apple Inc.

Inventor： Christoph H. Krah ,  Kingsuk Brahma

IPC: G06F1/16 ,  H01L27/32 ,  G06F3/044 ,  G06F3/041 ,  H01L51/52 ,  G06F3/042

Abstract: A touch screen configured for optical touch sensing and user identification using organic light emitting diodes (OLEDs) is disclosed. In some examples, one or more OLEDs can be used to display one or more images on the device, can be configured to emit light for optical touch sensing, and/or can be configured to detect a reflection of the emitted light. The touch screen can include a spatial filter configured to focus light emitted from the OLEDs and/or reflected light detected by the OLEDs for improved optical touch sensing. Using optical touch sensors, the touch screen can be capable of discerning between water and an object (e.g., finger) and/or noise (e.g., ambient light) and an object. The touch screen can also be capable of identifying (e.g., authenticating) a user using the active area of the device.

公开(公告)号：US10282026B2

公开(公告)日：2019-05-07

申请号：US15261578

申请日：2016-09-09

Applicant: Apple Inc.

Inventor： Christoph H. Krah ,  Steven P. Hotelling ,  Marduke Yousefpor

IPC: G06F3/0488 ,  G06F3/041 ,  G06F3/044 ,  H03K17/96 ,  G02F1/1333

Abstract: Measuring an effect of body capacitance in a touch sensitive device is disclosed. This effect can be caused by poor grounding of a user or other objects touching the device or of the device itself. The device can operate in a stray capacitance mode to measure a body capacitance effect and in a normal mode to detect a touch on the device. During the stray capacitance mode, the device can obtain a body capacitance measurement from the device. During the normal mode, the device can obtain a touch measurement from the device. The device can calculate a body capacitance factor based on a ratio between the body capacitance measurement and the touch measurement and use the body capacitance factor to compensate for erroneous or distorted touch output values from the device. Various components of the device can be switchably configured according to the particular mode.

公开(公告)号：US10222854B2

公开(公告)日：2019-03-05

申请号：US15260257

申请日：2016-09-08

Applicant: Apple Inc.

Inventor： Christoph H. Krah ,  Thomas James Wilson

IPC: G06F1/32 ,  G06F1/3287 ,  G06F1/3215 ,  G06F1/3234 ,  G06F3/041 ,  G06F1/3296

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：US10191576B2

公开(公告)日：2019-01-29

申请号：US15424712

申请日：2017-02-03

Applicant: Apple Inc.

Inventor： Steve Porter Hotelling ,  Wei Chen ,  Christoph H. Krah ,  John Greer Elias ,  Wei Hsin Yao ,  John Z. Zhong ,  Andrew Bert Hodge ,  Brian R. Land ,  Willem den Boer

IPC: G06F3/041 ,  G02F1/1335 ,  G02F1/1362 ,  G02F1/1343 ,  G09G3/36 ,  G02F1/1333 ,  G06F3/044

Abstract: Disclosed herein are liquid-crystal display (LCD) touch screens that integrate the touch sensing elements with the display circuitry. The integration may take a variety of forms. Touch sensing elements can be completely implemented within the LCD stackup but outside the not between the color filter plate and the array plate. Alternatively, some touch sensing elements can be between the color filter and array plates with other touch sensing elements not between the plates. In another alternative, all touch sensing elements can be between the color filter and array plates. The latter alternative can include both conventional and in-plane-switching (IPS) LCDs. In some forms, one or more display structures can also have a touch sensing function. Techniques for manufacturing and operating such displays, as well as various devices embodying such displays are also disclosed.

公开(公告)号：US10152187B2

公开(公告)日：2018-12-11

申请号：US15627058

申请日：2017-06-19

Applicant: Apple Inc.

Inventor： Christoph H. Krah

IPC: G06F3/041 ,  G06F3/044 ,  G06F3/01

Abstract: An integrated touch sensing and force sensing device is included in an electronic device. The integrated touch sensing and force sensing device includes a force-sensitive layer operably attached to an input surface, a first electrode layer attached to a first surface of the force-sensitive layer, and a second electrode layer attached to a second surface of the force-sensitive layer. An analog front end processing channel is operable to process a touch signal that is based on a change in an electrical property between the first and second electrode layers and operable to process a force signal that is based on an electrical property generated by the force-sensitive layer based on a force applied to the input surface.