Can holographic displays be created without glass or solids?

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Holographic displays without traditional glass components are being explored through technologies that utilize lasers and light interference. Current advancements in this field suggest that researchers are actively developing devices that can project images in three dimensions. The quality of these holographic displays is improving, but specific details on performance and availability remain limited. Interest in this technology is growing, indicating potential future applications in various industries. Continued innovation is expected as more teams focus on creating practical holographic solutions.
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i've tried searching but I'm not sure of the proper name for these things... interested in 'holographic' displays but without the normal glass or anything. i was thinking maybe there is an invention that uses lasers and/or interference to produce light/whatever. do you know? thx
 
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^bump.
I have also wondered what the current level of quality is in constructing one of these devices. I'm sure there are people working on such a thing.
 

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