4 Wire Resistive Touch Screen Technology
4 Wire Resistive
Older Touch Technologies
Other 3M Touch Screens
PALAS Software Pvt Ltd.
S-74 Okhla Industrial Area,
Phase 2,
New Delhi 110020, INDIA
Tel: +91-11-41708030
Fax: +91-11-41708037
Email: sales@palas-india.com
Web: www.palas-india.com
Regd Off: B – 39 Kailash Colony
New Delhi 110048
Bangalore : 93436-86824
Chennai : 93600-86824
Hyderabad : 93936-86824
Kolkata : 93309-86824
Mumbai : 93241-86824
Mumbai : 98205-03354
Touch measurement in 4 Wire technology is a 2 step process. First, the
distance along the x axis at the point of touch is measured by creating a
horizontal voltage gradient on the top sheet, with the bottom acting as the
return layer. Second a vertical voltage gradient is created on the bottom
layer, to measure the y axis.
The technology and electronics are simple, making 4 wire the cheapest
touchscreen technology. But since the voltage gradient is needed on both the
layers, any damage to either layer causes the touchscreen to stop
functioning. And damage is easy, since often both layers are plastic. This
lack of durability means that 4 wire technology should not be used for
applications like public access kiosks, industrial locations or on displays
larger than 12”.
