Curved TV's reduce breakage in shipping and handling. That's a big deal as screens get bigger. A curved surface is stiffer/stronger than a flat surface of the same area. That's one reason why all the sheet metal in cars is curved.
The marketing dept was charged with the task of selling the curve to the public so they came up with the BS about more realistic images.
I don't know if statistics bear that idea out, but mechanically it's very plausible. This is worthy of comment.