iPhone 4 screen shows color patterns

Please see photos, i have this iPhone 4, after I turned it on for 15 minutes, the screens turned out like as shown in these photos.
And now the phone is completely black. I left it charge for a day and now I couldn't even turn it on.
Anyone has this problem before? If so, what could be wrong and could you please help me to fix this?
Thank you so much in advance,
Regards,