US 12,321,548 B2
Tough panel location detection with different frequency-phase offset combinations of electrode signals
Franck Goussin, Blainville sur Orne (FR); Frederic Darthenay, Luc sur Mer (FR); Jean-Robert Tourret, Cormelles le Royal (FR); and Vincent Geffroy, Cuverville (FR)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Feb. 26, 2024, as Appl. No. 18/587,195.
Claims priority of application No. 23305301 (EP), filed on Mar. 7, 2023.
Prior Publication US 2024/0302918 A1, Sep. 12, 2024
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/04166 (2019.05) [G06F 3/0446 (2019.05)] 20 Claims
OG exemplary drawing
 
1. A touch pad system, comprising:
a touchpad including a first plurality of electrodes and a second plurality of electrodes, wherein the first plurality of electrodes and the second plurality of electrodes define a plurality of crosspoints where each crosspoint of the plurality of crosspoints is defined by an electrode of the first plurality of electrodes and an electrode of the second plurality of electrodes;
a plurality of drivers, each driver of the plurality of drivers is configured to drive a detection signal on a respective electrode of the first plurality of electrodes during a touch location detection mode;
a plurality of sensors, each sensor of the plurality of sensors configured to sense a sense signal on a respective electrode of the second plurality of electrodes, wherein during the touch location detection mode, a sense signal on an electrode of the second plurality of electrodes is dependent upon the detection signals driven by the drivers of the plurality of drivers on the first plurality of electrodes that define crosspoints of the plurality of crosspoints corresponding to the electrode of the second plurality of electrodes;
wherein during the touch location detection mode, each driver of the plurality of drivers drives on its respective electrode of the first plurality of electrodes a detection signal that includes one or more frequency signal components with each frequency signal component having a frequency and a phase offset and where each frequency signal component of the one or more frequency signal components has a different frequency, wherein the detection signal driven on each electrode of the first plurality of electrodes has a frequency and phase offset combination of the one or more frequency signal components of the detection signal that is unique to all of the other detection signals driven the other electrodes of the first plurality of electrodes, wherein the detection signals driven on the first plurality of electrodes include at least three different phase offsets for at least one frequency;
wherein during a touch location detection mode, information of a sense signal on an electrode of the second plurality of electrodes detected by a respective sensor of the plurality of sensors is utilized to determine locations of touch events at crosspoints corresponding to the electrode of second plurality of electrodes.