公开(公告)号：US20240302915A1

公开(公告)日：2024-09-12

申请号：US18595499

申请日：2024-03-05

Applicant: NXP B.V.

Inventor： Frederic Darthenay ,  Jean-Robert Tourret ,  Franck Goussin ,  Vincent Geffroy

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0416 ,  G06F3/0446 ,  G06F2203/04111

Abstract: A touch panel includes a first plurality of electrodes and a second plurality of electrodes. A plurality of transmitters generate a plurality of transmit signals by modulating a common sine wave signal with a set of orthogonal modulation signals, and drive each transmit signal onto a corresponding electrode of the first plurality of electrodes. Each transmit signal is generated by modulating the common sine wave signal with a unique orthogonal modulation signal of the set of orthogonal modulation signals. At least two of the plurality of transmit signals are not orthogonal. Each receiver of a plurality of receivers senses a receive signal on a corresponding electrode of the second plurality of electrodes and generates a set of correlation signals by correlating the receive signal with each transmit signal of the plurality of transmit signals. The sets of correlation signals are used to detect a touch event on the touch panel.

公开(公告)号：US20250036238A1

公开(公告)日：2025-01-30

申请号：US18764690

申请日：2024-07-05

Applicant: NXP B.V.

Inventor： Jean-Robert Tourret ,  Franck Goussin ,  Frederic Darthenay ,  Vincent Geffroy

IPC: G06F3/041 ,  G06F3/044

Abstract: A method for display noise canceling in a touch sensing system includes measuring a first feedback voltage of a feedback node resistively coupled to a line voltage of a capacitive touch panel, the line voltage formed by a continuous wave output of an amplifier responsive to a reference voltage difference between the first feedback voltage and a reference voltage. A second feedback voltage is clamped to a first upper voltage threshold in response to a first voltage difference between the first feedback voltage and the reference voltage being greater than the first upper voltage threshold. The second feedback voltage is clamped to a first lower voltage threshold in response to the first voltage difference being less than the first lower voltage threshold.

公开(公告)号：US20240302918A1

公开(公告)日：2024-09-12

申请号：US18587195

申请日：2024-02-26

Applicant: NXP B.V.

Inventor： Franck Goussin ,  Frederic Darthenay ,  Jean-Robert Tourret ,  Vincent Geffroy

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/04166 ,  G06F3/0446

Abstract: A touch panel system that includes drivers for providing detection signals on a first plurality of electrodes of a touch panel where each detection signal includes one or more frequency signal components with each frequency signal component having a frequency and a phase offset. The detection signals includes at least three phase offsets for at least one frequency of the frequency signal components. Each detection signal has a unique frequency-phase offset combination of the one or more frequency signal components. The unique combinations allow for the determination of a touch at specific locations on the panel by sensing signals on a second set of electrodes.

公开(公告)号：US20240393910A1

公开(公告)日：2024-11-28

申请号：US18664150

申请日：2024-05-14

Applicant: NXP B.V.

Inventor： Frederic Darthenay ,  Jean-Robert Tourret ,  Franck Goussin ,  Vincent Geffroy

IPC: G06F3/044 ,  G06F3/041

Abstract: A touch screen is disclosed having a length and a height, and comprising interspaced and galvanically isolated first and second arrays of touch pads; wherein the first array of touch pads comprises a plurality of first strings of series-connected touch pads, each first string forming a drive line and extending in a first general direction; wherein the second array of touch pads comprises a plurality of second strings of series-connected touch pads, each second string forming a read line and extending in a second general direction, different to said first general direction; wherein the first general direction and the second general direction are each different from the length direction; and wherein the touch screen is configured for capacitive-based sensing which may be based on a change in a mutual capacitance between individual ones of the drive lines and individual ones of the read lines.