On which principles does a capacitive touch screen work to enable detection of multiple triggers?
I understand that there are two layers; a driving layer and a sensing layer (with x or driving and y or sensing lines) that form a grid that when touched causes a trigger of some-sort.
How can it determine multiple touches, and what if your multiple touches effect the same driver or sensing line, how does it determine where those touches originated from?
Best Answer
If you are familiar with the keyboard matrix circuits, and know how it works. You can understand this kind of capacitive sensor well.
You know, in a 2-D map, any points are determined by (x,y). Points with same 'x' (or 'y') but different 'y' (or 'x') are recognized as different points.
Refs: