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This is a "holographic" display made of fan blades:
Each blade contains hundreds of LEDs:
Here's an explanation of how it works:
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And here's a demonstration model from HyperVSN, one of the larger players in the space, with each individual fan costing upwards of $3,000:
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The thing no one mentions in any of the videos is: How noisy is the thing? Then again, since fans moving at a steady rate produce a predictable soundwave, I suppose it would be easy enough to rig up a noise-canceling speaker.
I’m a lapsed industrial designer. I was born in NYC and figured I’d die there, but a few years ago I abandoned New York to live on a farm in the countryside with my wife. We have six dogs.
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"Holographic" Displays Made from LED Fan Blades
They're pretty quiet, but you do hear a whirring when standing in front of them. Would not want to try to watch a movie in your living room, but they're not noticeable when in a large public space. I saw a lot of these at the ISA sign expo in Vegas a year ago.