The LCD is "jumping" up and down + horizontal lines

The LCD on the MacBook Pro early 2011, 13" is "jumping" up and down and at certain display positions horizontal lines are running up and down the screen and the screen gets frozen.

And often it is only the half lower part of the LCD which is "jumping" up and down. The lines though are on the whole LCD.

At certain display positions it can work normally sometimes.

What can the problem be, can it be a display cable which is faulty? I don't think the actual LCD display is faulty since it works in certain positions.