I only just realised that the TNG viewscreen displays images in 3D

Been a Trek fan for as long as I can remember, and grew up watching TNG. Yet somehow I never noticed before that the viewscreen on the Enterprise D displays images in 3D!

I was watching S4E11 (Data's Day) last night and noticed that, when the camera showed the viewscreen from a side-angle, the image was perspective-correct.

See examples here.

Presumably, it's more like looking through a window than seeing an image on a flat screen.

Maybe this is common knowledge, but I found this pretty mind-blowing!