iphone screen problem?

Hi, ive recently upgraded to the 3GS from the 3g and realised that on certain screen such as the app store when loading up and scrolling through it the screen seems to flicker, with tiny lines in the background. this isn't a huge problem but it did not happen with my old iphone and i was just wondering if it was a defect, thanks for any replies.

update, it seems to happen whenever i scroll the screen or look at it at different angles, tiny lines appear until the scrolling stops, very noticeable on some games, is this common with the new 3gs screens?

i've never heard of this issue except for just now. My 3GS doesn't seem to have that problem. Maybe you should have a "genius" look at it.