you can get it replaced.
But it will cost you about four times that of a new, LCD monitor.
Trust me... been down this road. I had a monitor that did the same thing; except it went right into a straight line in the middle.
I was able to fix it, temporarily, though, by giving it a good solid whack. results may vary, and this is certainly not a long-term solution.
I might add that in my case the monitor literally exploded; sparks and smoke and whatnot. Quite exciting.