Egregoros

Looked up the ibm patents on capacitive keyboards. I was wrong about the unconnecred pad but still confused why it's there

Inb4 it's just for less vias...

Yeah, seems these pcbs have no vias apart from where the controller connects which ig only needs drilling and no plating

Makes sense considering it was mostly created to be cheaper tham beam spring keyboards, i don't think there's any other capacitive keyboard with no vias, this indirect coupling prob reduces snr?