This is vague, but I remember seeing several different arcade machines, probably in the early 90s, with various sorts of "holographic" 3D displays. By that I mean that they produced depth perception and at least a somewhat viewing-angle-dependent image without the player/viewer wearing any sort of glasses or headset. I believe they all utilized a display that was significantly sunk behind glass, so you couldn't get too close to it and the range of viewing angles was fairly limited. I seem to recall there being one or several such overhead-adventure games and maybe one fight game, but I may be mixing up memories of different (non-3D) games here.
Were there actually such games? If so, what were their names and what type(s) of technology did they use for the displays? Some basic googling for holographic display yielded mostly technologies that would not have been around at the time and which look fancier that what I remember seeing.