I assumed we are talking display that only accepts ASCII. With graphical display, of course, we do that in SW.

Ah, hrmmm.. Yeah. A mirror, I guess.

The reflective surfase just has to be flat.

Hmm. I don't think a little bit of distortion would be a problem, on my windshield at least, the center area is flat enough that I think it'd be very legible.

The question is, would a VFD put out the light in enough of a... umm... direct manner (?) that it wouldn't be fuzzy when projected onto the windshield... This is where we need our physics PhD's to step up and join the fun...