Infinity Blade screen size (iPad)

Does anyone know why Infinity Blade (1 & 2) has these annoying black bars under and above the screen? Why doesn't it use the whole screen?

Maybe to boost performance with a few fps.

Does anyone know it for sure? Am I the only one who is annoyed by it?

I think they simply designed the game for the iPhone screen's aspect ratio and couldn't be bothered to adjust it when played on an iPad. Seems like an odd sign of laziness for such a high budget game.