My wife's iPhone 5s screen cracked and for the holidays I had a friend of mine install a new screen on her phone. The only problem is, there's some weird issues going on. First, the outer edges of her screen are lighter than the center, and second, on dark screens you can see burned in images of her keyboard. She already shut it off for a while and did a soft reset and that didn't fix it.
[Update] Just noticed that the image 'burned in' changes frequently. For instance, if I have Facebook open then go directly to an all black image, I'll see remnants of Facebook. If I have Google open then go directly to a black image, I'll see remnants of Google. There's also a dead pixel on the left side.