MULTI-TOUCH TOUCH-SENSITIVE DEVICE WITH MULTI-FREQUENCY CAPACITIVE DETECTION COMPRISING MEANS OF FAULT DETECTION

摘要

The general field of the present invention is the field of touch screen devices (1) with projection type capacitive detection comprising a touch-sensitive matrix panel (10) including a plurality of conductive rows (11) and conductive columns (12). An electronic control means generates two periodic transmission voltages transmitted at two different frequencies. Analysis of reception voltages is used to determine the position of presses on the touch-sensitive panel including when the row or column is cut. The press on the cut row or column is basically determined by calculating the center of gravity of′virtual′hollows in the reception voltages corresponding to the cut row or column.