A few 3D mist displays have been demonstrated over the last decade. I’ve seen a couple at trade shows and have been impressed. To date, they use mists or curtains of tiny water droplets to make a 3D space onto which to project an image, so you get a walk-through 3D life-sized display. Like this:
Leia Display System Uses A Screen Made Of Water Mist To Display 3D Projections
or check out: http://ixfocus.com/top-10-best-3d-water-projections-ever/
Two years ago, I suggested using a forehead-mounted mist projector:
so you could have a 3D image made right in front of you anywhere.
This week, a holographic display has been doing the rounds on Twitter, called Gatebox:
https://www.geek.com/tech/gatebox-wants-to-be-your-personal-holographic-companion-1682967/
It looks OK but mist displays might be better solution for everyday use because they can be made a lot bigger more cheaply. However, nobody really wants water mist causing electrical problems in their PCs or making their notebook paper soggy. You can use smoke as a mist substitute but then you have a cloud of smoke around you. So…
Suppose instead of using water droplets and walking around veiled in fog or smoke or accompanied by electrical crackling and dead PCs, that the mist was not made of water droplets but tiny dry and obviously non-toxic particles such as fluorescent micro-spheres that are invisible to the naked eye and transparent to visible light so you can’t see the mist at all, and it won’t make stuff damp. Instead of projecting visible light, the particles are made of fluorescent material, so that they are illuminated by a UV projector and fluoresce with the right colour to make the visible display. There are plenty of fluorescent materials that could be made into tiny particles, even nano-particles, and made into an invisible mist that produces a bright and high-resolution display. Even if non-toxic is too big an ask, or the fluorescent material is too expensive to waste, a large box that keeps them contained and recycles them for the next display could still be bigger, better, brighter and cheaper than a large holographic display.
Remember, you saw it here first. My 101st invention of 2016.
Timeguide - The future before it comes over the horizon 
This is kind of like the invention you envisioned: https://youtu.be/tzWP-NL3Lck
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The ones in the video are not based on mist, so not the same. I’ve seen demos at conferences where large images are projected onto clouds of thin mist, and you can walk through them. They are not holograms , but just 3D projected displays.
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