Perched atop a pair of active shutter glasses are a couple of miniature LCD projectors, which bounce images from a connected computer onto a special reflective surface at a 120Hz refresh rate.

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What you see above is an LCD panel that refreshes at 240Hz, and delivering 3D at 60 frames per second to each eye, by using the typical active shutter glasses technique of blocking light to your left eye when the "right" image is displayed, and vice versa for the right eye.

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Another unique aspect of the event was that ESPN had both active shutter and passive glasses 3DTVs showing the match, which is a unique opportunity to compare the two technologies -- not that it matters since all the consumer 3DTVs use active shutter glasses at the moment -- and while both were enjoyable, the active shutter TV was preferable.

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The PT-AE8000U projector's built-in IR transmitter enables synchronization with active shutter 3D glasses and can transmit up to 20 feet.

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For one thing, the "passive" glasses, which are polarized and don't contain electronics and batteries, cost far less than "active shutter" glasses, which were hyped last year.

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The company is also (without DFKI) developing a virtual reality environment that uses a pair of active-shutter glasses and a head-tracking camera to let you wander around cave-like structures from the comfort of the lab.

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This technology uses lightweight glasses tocreate a comfortable 3D viewing experience without the distracting flicker or crosstalk of active shutter-style glasses.

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Moreover, the shutter glasses that come with active 3-D TVs are expensive.

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