![Image](http://mtbs3d.com/gallery/albums/userpics/10002/100802-nvidiaglassesmod-01.jpg)
The idea is this. One of the challenges behind 3D screens is that they are either in 2D mode or 3D mode - not both. So if there are people in the room who want to watch in 2D (maybe they can't see in 3D), a doubled screen image will be a problem for them. This hack allows the glasses to show only the left or right sided image, so the 3D viewers get their 3D experience, and the 2D viewers get their 2D experience.
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