Mon Sep 22, 2014 11:21 am
This can happen when you have any strong EMI source nearby, like fluorescent lamp, high-voltage cable or transformer. Also, only N-Trig based touchscreen (like our old 10" LCD that you bought) are affected, because they have electromagnetic grid to support active stylus. Our new 10", and all others touchscreen LCD (7", 14", 15.6") are immune to EMI.
Chalkboard Electronics
Touchscreen and LCD solutions for RaspberryPi
http://www.chalk-elec.com