Infrared

TCI-News Abonieren

Infrared touch screenes are primarily used for large displays, banking machines, and in military applications.
Infrared touch screens are based on light-beam interruption technology. Instead of an overlay on the surface, a frame surrounds the display. The frame has light sources, or light emitting diodes (LED's) on one side and light detectors on the opposite side, creating an optical grid across the screen. When an object touches the screen, the invisible light beam is interrupted, causing a drop in the signal received by photosensors.

 

Advantages

  • 100% light transmission (not an overlay)
  • accurate

Disadvantages

  • costly
  • low reliability (MTBF for diodes)
  • parallax problems
  • accidental activation
  • low touch resolution
  • no protection for display surface