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Multi-touch Screens

2009 – 2011

After watching a video of Jeff Han's wall–sized multi-touch screen, I wanted my own. I started frequenting the Natural User Interface Forums and was introduced to the world of Human–computer interaction research.

The last version I made was desk-sized and used frustrated total internal reflection to detect touches.

A cheap first prototype was made from a torn apart computer monitor and two infrared lasers with plane lenses sitting on top of a carboard box. A modified PS3 Eye webcam at the bottom of the box could see the reflected IR light from fingers when touching the screen. Image processing software turned the camera's image into mouse clicks.