Question

why does colour on my laptop changed when i move my head​

Answer 1

If different colors or lines happen or even if the screen returns to the normal color, then the most likely cause is screen failure. If this happens, then the only option for fixing the issue is to have the entire LCD panel replaced, which can be done quickly if they have the required parts on hand.

Answer 2

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When you move the hinge it moves the ribbon around connecting and disconnecting the tiny wires. Each wire represents different colors, so if the wire that carries the signal for blue is damaged inside the ribbon cable, then blue will go in and out, etc.