Samsung SCH-U740 Alias

Have this phone and love it. I was using my phone yesterday and noticed a red dot (looks like a dead pixel) on my screen. Changed wallpaper to make sure that it wasn't the pic. Realized that whenever I have a dark background it would show up, but if background is light it doesn't show. Was just wondering if anyone else has this problem. I have warranty and insurance so I am not too bothered by it, just wanted to see if this is a big problem to look out for.