TOUCH SCREEN TECHNOLOGY
Four different technologies used to make touch screens today:
Resistive
Capacitive
Surface Acoustic Wave (SAW)
Infrared LED or Optical
4.
RESISTIVE SYSTEM
Consists of a glass panel with two layers,
conductive and resistive metallic layers
Electrical current runs between both layers when
operational
The two layers make contact when touched,
sending coordinates to the driver
CAPACITIVE SYSTEM
One layer that stores electrical
charges on the panel
When touched with a finger, the
electrical charge is transferred to user
Computer then coordinates where
touch took place