Just a bit after its announcement, we learned that the 2DS screens are really just one big screen with some facing plastic and software doing the trickery. Those clever kids at Nintendo never fail to surprise.
Rose Colored Gaming hacked a 2DS open to see this screen, shown above. It's huge! So much wasted space! When you look at it this way, it's really a tablet. That's a weird thought to me.
You can see that the innards of the 2DS are quite simple in their other picture of the breakdown.