Why is my screen green & yellow?

So my iPad slipped off the bed & at first the screen was completely black but after holding down both the power & home bottom a couple times it came back, but now the screen is yellow & green, no adjustments to the brightness or hits on the back helps. & in order for me to see certain things on the screen I have to hold it at an angle because it looks like a shadow or its smudged. I took it to apple & they said its gonna cost me $249 to get it fixed because they will have to order a part. Please help I'm sure it's less complicated than they're making it. Or at least I hope so.