Default [Q] my screen issue

guys i have this issue with the screen of my s2 it develops lines all over when i charge it or its temperature rises the lines disappear what may be causing this and how to fix it
http://i.imgur.com/3mbgTxk.jpg
http://i.imgur.com/EEkMIkI.jpg
http://i.imgur.com/QvlNv7Y.jpg