Contrary to what everyone has said, it's not the GPU. It's worse, it's the screen. It's pretty easy to tell the difference in problems between the two, the photos you show clearly display analogue display problems, as opposed to digital display problems that the GPU would churn out. Also, as it gets worse over time this is another clear sign that this is an analogue problem rather than a GPU problem. If it was the GPU you could get it replaced, but unfortunately while you can get the screens on laptops replaced it's usually as expensive as buying a new laptop.