Laptop screen problem

I'm having a very wierd problem with my laptop screen. It is getting band, shaking through the screen. I don't know if thats really accurate way of saying it but its the best I can describe it. And it only happens with certain colors and worse depending on what color next to it. But its slowly getting worse. It dosn't happen if I hook up a monitor or TV screen as the display, only on the LCD. Anyone have any idea what could be wrong or what I could do? I really really dont want to send it in for repair cause its my only computer and I cant live without internet.