Well, I don't know squat didly about "rotational filters", but I think you guys are on to something.

There has to be something that only lets light pass one direction. Maybe somthing they use in Flat panel monitors? or LCD displays?

What about coating the VFD with something? Another non glare layer, or mirror perhaps?

Can the VFD be completely replaced?

Damn... I'm going to be spending the rest of the day thinking about this now...