CRT style Scanlines improve 2D animation.

The 'scan lines' formed by screen cycling from frame to frame seems to help differentiate the pixels.
Scanlines were a characteristic of CRT computer screens, but were not part of how pixel orientated plasma screens operate, therefore were not only removed, but not possible.

A man has invented a chip that artificially (and adjust-ably) inserts scanlines back into the image.


Note that this is only really useful for 2d games and nostalgia trips.

http://retro.nintendolife.com/news/2011/04/feature_the_slg3000_and_the_glorious_return_of_scanlines