Ideum MT-50, Building Instructions

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MT-50 Multitouch Table DIY Building Instructions–Version 1.2 - 4/5/11 - Page 17
Connecting Low Voltage Electrical
At this point, you should have the electrical leads from the fans and from
the lights routed so that they reach near the computer. Use a 4 square
electrical box as a junction point for all of the connections. Route two of
the connectors from the computer power supply that have 4 pin Molex
connectors on them into the box. Use the Molex connectors to plug in the
fans and lighting wires. The fans should have come with 3 pin-to-4 pin
adapters.
Applying Projection Film to Glass and Masking
On our tables, we use custom pieces of glass with projection film on one
side. The glass is 10mm thick with a fine micro-etch on the top surface. The
glass is etched in a way that doesn't adversely affect the way that light
passes through the glass while providing haptic feedback. The micro-etch
also provides a reduction in reflected light and an increase in viewing angle
to almost 180 degrees.
The diffusion material on the underside of the glass is a custom projection
film selected to provide the best performance with short-throw projectors.
The material actively scatters the light, giving the screen a low incidence
angle (meaning the image is viewable from a wide range of angles) with
evenly distributed brightness.
Applying the projection film to the glass can be tricky with this setup.