"Miniature" holograms are seen a few times in Star Trek, including the hologram of Tasha Yar, which Data had, and the mini-EMH hologram ("Virtuoso").

This technology presumably had some sort of built-in "mobile emitter," which allowed these holograms to operate outside of a holodeck.

I don't understand why the mobile emitter was so amazing to the Voyager crew. The technology existed prior to this discovery, although it was never shown working on a full-size hologram.

Couldn't the technology used for the Tasha Yar hologram simply be adapted for the EMH? Maybe it was impossible for some reason.

  • 4
    Miniature holograms have no substance. The mobile emitter was, for want of a better phrase "hard light". That was what made it special.
    – Valorum
    Commented Dec 22, 2015 at 1:48
  • At the ends of TNG Ship in a Bottle and VOY Killing Game, Part II we see the sort of device that would be required to provide the minimum processing and memory storage necessary to run the Doctor's program, presumably also containing a power supply. Add on to that whatever hardware and power supply would be needed to generate a life size, interactive holographic matrix, and that would be the 24th century mobile emitter.
    – Xantec
    Commented Jun 10, 2016 at 17:41

1 Answer 1


the mobile emitter actually contained the doctors program as well as a hard light holographic projector

the mini holograms we see in TNG are basically framed pictures that just happen to use holograms instead of film


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