I was watching back a back to the future 2 scene where in 2015 they had this flatscreen tv.
How did they do that?
https://www.youtube.com/watch?v=-8oS4VbRaAA

I mean, I kind of investigated and the first flat screen came out in 1997, but the film was made in 1989. did they use some green screen thing or how was this actually done?