IRJET - Touchless Technology

This document discusses the history and development of touchscreen technology. It describes early touchscreen devices from the 1980s that used infrared sensors to detect touch input. It then covers the development of multi-touch screens in the 2000s and 2010s, including innovations like Frustrated Total Internal Reflection that enabled intuitive multi-touch interfaces. The document also provides details on the working of different types of touchscreen sensors and controllers. Finally, it introduces touchless touchscreen technology developed by Elliptic Labs that allows control of devices through hand gestures without physical contact.