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Infrared Touch Screens have proven reliable touchscreen
technology
Infrared touch screen technology
is based on "legacy" technology and is becoming
increasingly replaced by Resistive or Capacitive touch
systems. Over the years, Infrared bezels have proven to
be a very reliable technology for use in ATMs, Food Service
and Preparation, KIOSK, Medical Instrumentation, Process Control
Systems and Transportation Tracking applications. It does
not incorporate any sort of "overlay" that could
inhibit screen clarity or brightness, but instead, uses a
special bezel of LEDs (light emitting diodes) along with diametrically
opposing phototransistor detectors, which surround the glass
of the display surface. The controller circuitry scans the
screen with an invisible lattice of infra-red light beams
just in front of the surface that directs a sequence of pulses
to the LED's. It then detects information at the location
where the LEDs have become interrupted by a stylus or finger.
The infrared frame housing the transmitters can impose design
constraints on operator interface products. A few limitations
are (1) that they usually require low-resolution output of
the monitor, (2) can produce activation without touching the
screen and (3) the cost to produce the special Infrared bezel
is quite high.
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