Infrared technology may not be new, but it remains a favorite. It tends to be employed in large-format displays and some kiosks and point-of-sale (POS) terminals. It has a long life, furthering its popularity in the digital signage and interactive display markets.
How Infra Red Works:
Infrared touch technology requires a perimeter to be placed around the display. The perimeter consists of infrared LEDs placed on two sides of the display and photo transistors placed on the opposing two sides. The two sides then work in pairs; the signal from the LED transistor is read by its opposing photo transistor. When that signal is interrupted, it indicates a blocked infrared beam, which, in turn, indicates a touch point. While most infrared displays don’t require a touchscreen, a glass overlay usually is recommended in order to protect the underlying display.