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38 Elektronik International 2020 Optoelectronics Infrared touchscreens are again becoming an alternative in HMI development Amodified approach does away with familiar drawbacks like thick frames and restricted functionality in sunlight Multitouch and gesture recognition are now possible in the meantime By Rudolf Sosnowsky Developing HMIs Infrared touchscreen rediscovered Infrared technology for touchscreens has a long history The principle is simple a light grid is mounted on the Xand Yaxes of a screen If this light grid is interrupted any penetrating object is detected and its position can be evaluated This technology is simple and robust and has the advantage of being separate from the display It is used where displays are exposed to extreme environmental conditions such as ambient temperature or vandalism Examples are ticket vending machines and ATMs There you can concentrate on protection of the display surface and make it meet requirements e g mount a thick pane of protective glass that can be replaced in case of damage There are some disadvantages however The diagonal increases the number of IR emitters and detector diodes as well as current consumption Bright ambient light such as direct sunlight at some times of the day superimposes on the usephoto Neonode