There are several causes which leads to ;this' problem.
1) Check the display cable which runs mostly along the hinges of laptop screen. It is it damaged then replace it.
2) The actual screen is problem. Check it and replace if problem persists.
3) The 'converter / inverter' module of LCD becoming weak or faulty.
4) The 'built-in' graphic card/chip on laptop's motherboard is faulty due to overheating, clogging, dust, or any other reason.
PLEASE CHECK THESE DETAILS WITH PROFESSIONAL HARDWARE ENGINEER, as you alone cannot diagnose or identify the problem.
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