What's the latest development in Holographic display?

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The discussion centers around advancements in holographic display technology, specifically highlighting a rotating mirror system developed by USC's Graphic Lab that emulates holographic displays. While this technology is impressive, there is curiosity about the possibility of projecting images in mid-air without a specific medium. Holographic vapor displays have been mentioned as an existing technology, but the feasibility of true mid-air projection remains uncertain and may not be scientifically viable at this time.
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I don't know where to post this so here it is.

I've googled it, found something interesting by USC Graphic lab, turns out it's a rotating mirror, emulating a holographic displayer, but fair enough, it's still quite amazing.

http://www.wired.com/gadgetlab/2008/06/usc-lab-creates/

Is there anything that does not require specific medium? For example, projecting in the middle of the air? I know it may not be scientifically possible.
 
Computer science news on Phys.org
Moving to tech.

holographic vapor displays have been around for several years now, but that is all I know about.
 

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