I've noticed that if I look really closely at the screen when it's all white when first booting the phone, I can see some slight burn-in of the time in the top right corner and a couple of the notifications in the top left. It's very hard to see and I've had my phone for almost 2 years now with fairly heavy use.
Does the ghosting you see go away after going back to the home screen, or do you permanently have solitaire figures burnt in?