US 11,669,168 B2
System and method for touch-gesture recognition
Fabio Passaniti, Syracuse (IT); and Enrico Rosario Alessi, Catania (IT)
Assigned to STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed by STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed on Jan. 25, 2021, as Appl. No. 17/157,584.
Claims priority of application No. 102020000001603 (IT), filed on Jan. 28, 2020.
Prior Publication US 2021/0232227 A1, Jul. 29, 2021
Int. Cl. G06F 3/01 (2006.01); G06F 3/0346 (2013.01); G06F 3/041 (2006.01); G01R 29/12 (2006.01); G01R 29/24 (2006.01); G06F 3/044 (2006.01); G06F 3/038 (2013.01)
CPC G06F 3/017 (2013.01) [G06F 3/0346 (2013.01); G06F 3/0412 (2013.01); G06F 3/0416 (2013.01); G01R 29/12 (2013.01); G01R 29/24 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for detecting a touch gesture of a user on a detection surface, comprising:
a processing unit;
an electrostatic-charge-variation sensor, operatively coupled to the processing unit and to the detection surface, configured to detect a variation of electrostatic charge on the detection surface and to generate a charge-variation signal; and
an accelerometer, operatively coupled to the processing unit and to the detection surface, configured to detect a vibrational signal on the detection surface and to generate an acceleration signal,
wherein the processing unit is configured to:
acquire the charge-variation signal;
acquire the acceleration signal;
detect, in the charge-variation signal, a first signal feature identifying the touch gesture of the user;
detect, in the acceleration signal, a second signal feature identifying the touch gesture of the user;
detect a temporal and shape correspondence between the first and second signal features that identify the touch gesture; and
validate the touch gesture of the user only in the case where both of the first and second signal features have been detected and the temporal correspondence satisfies a pre-set relation.