Synaptics Incorporated
Multi-touch detection in moisture

Abstract:

A method of detecting touch inputs, in the presence of moisture, in a sensing region of an input device. The input device acquires sensor information about the sensing region via a plurality of sensor electrodes configured for capacitive sensing. A first capacitive image of the sensing region is generated based on the received sensor information. The input device further determines a set of contiguous regions in the first capacitive image and selects, from the set of contiguous regions, one or more contiguous regions that correspond to valid inputs. The one or more contiguous regions may be selected based at least in part on a plurality of capacitive images previously acquired for the sensing region. The input device may further report positional information for each of the selected contiguous regions. For example, the positional information may be used to process user inputs associated with the selected contiguous regions.