US 12,493,380 B2
Sensing system and method to detect moisture on a sensing region of an input device
Guozhong Shen, Fremont, CA (US); Guan-Hua Cao, San Jose, CA (US); Long-Ming Cheng, Guangdong Sheng (CN); and Ching-Hsung Wang, Santa Clara, CA (US)
Assigned to Synaptics Incorporated, San Jose, CA (US)
Filed by Synaptics Incorporated, San Jose, CA (US)
Filed on Mar. 28, 2024, as Appl. No. 18/619,337.
Prior Publication US 2025/0306709 A1, Oct. 2, 2025
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0418 (2013.01) [G06F 3/0445 (2019.05); G06F 3/0446 (2019.05)] 19 Claims
OG exemplary drawing
 
1. A method for capacitive sensing, comprising:
obtaining, by a processing system and using a first set of electrodes from a plurality of electrodes of an input device, first resulting signals based on driving a second set of electrodes from the plurality of electrodes, wherein the first set of electrodes and the second set of electrodes are oriented on a same axis of orientation;
determining, by the processing system, a grounding condition of the input device indicating whether the input device is operating in a low ground mass (LGM) condition; and
in response to determining that the input device is operating in the LGM condition:
obtaining, by the processing system, second resulting signals based on operating a third set of electrodes from the plurality of electrodes in an absolute capacitance sensing (ABS) scheme; and
determining, by the processing system, a presence of moisture on a sensing region of the input device based on the first resulting signals and the second resulting signals.