LED Touch SensingMulti-Touch Sensing through LED Matrix Displays Using an LED display bidirectionally to optically detect finger touches Two scalable techniques for enabling ordinary LED matrices to simultaneously act as multi-touch input devices. In 1977, Forrest M. Mims reminds us in one of his "Engineer's Notebooks" that LEDs can also be used as photodiodes... More info coming soon, I promise... Short video [12
