I don't think so. I suggested the possibility of using Polarising film to do this but to be honest I didn't think it would work. It would depend on the Phosphor on the VFD elements rotating the polarised light by 90 degrees (or thereabouts). I think this is very unlikely. Instead, I think the Phosphor would randomise the light again so that it wouldn't be polarised any longer. I don't have any evidence that this is what would happen, it's just my gut feeling. If by chance the Phosphor reflected back the polarised light without any (or little) randomising or rotation then we'd need a filter that rotated the light 45 degrees. It would have to rotate the same way (or opposite ways depending on how you look at it) because you would want the two 45 degree rotations to be added together otherwise you'd get no net rotation. Now, I don't know if there is any kind of film that will rotate light this way. Anyone else know of such a beast?
Of course the downside to using a polarising filter is that it blocks out significant amounts of light and this might be too much to make the VFD viewable.
Am I making sense? Does anyone else know more about polarisation & rotational filters?