Strange Blue Vertical Lines All Over Anything that White on the Screen

My screen always showed blue vertical lines on anything that is white on my Macbook Pro screen, but when I moved the screen back and forth a few times the blue lines just gone. It always happens when I took the Macbook Pro from a bag and waked it up and once and a while during normal usage. I took picture when the blue lines happen but I couldn't post it on the forum.
I sent my Macbook Pro to local Apple Center but they couldn't find the problem. They has checked the screen connector for me but the problem still exist.
Anyone, any idea what causing this?

BJ_pkt
Don't get me wrong and I don't think anyone like to have dead pixel, do you?
I understand the LCD screen could come with dead pixel. I can live with a few dead pixels and I have no problem except any dead pixel from USAGE. With the new notebook or LCD screen I have a choice to check for the dead pixel and other false before I take any of them back home and if there any dead pixel happen after I am start using them I can accept it.
The thing that difficult for me to accept is the replaced LCD came with the dead pixel (my previous screen didn't have any dead pixel) and I don't have any other choice but to accept it. I feel like I have been forced to accept it.
My perception on Apple product quality still good. I will continue buy Apple product. But I disappoint in Apple service policy (not quality as I mention before, sorry) because I expect they would be better or different from others.
ps. They changed my screen because they don't have a replacement only for screen cable so they replace the whole screen.

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