Well, Sony Pictures is huge. Their database of movies is enormous. (Pride and Prejudice and Zombies is one of the movies distributed by Sony)

Imagine they stored all of the movies they distribute in 4K in your TV. Whenever the movie is displayed they just find it in the database and reproduce the 4K version.

Of course, that is very much infeasible, it requires too large of a storage.

What they do is something like Waifu2x I linked, they train a neural network to learn how to properly upscale movies. They put the "algorithm" on the chip, and its fast enough for real time usage.