Touch International shared me a helpful article to understand projected capacitive touch technology.
Projected Capacitive Touch Screens (PDF)
More white papers about touch technologies can be found here.
Thanks, Touch International.
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Force, Pressure, and Touch - kitronyx.com
Force pressure touch technology: FSR sensor, electronics, firmware and software
Design Service Low Cost Pressure Mapping
Force pressure touch technology: FSR sensor, electronics, firmware and software
Design Service Low Cost Pressure Mapping