It sounds more like the lighting module blew out, not the whole LCD. If you can still see it in bright light, and the touch screen is working, it could just be the bulb or the hf circuit is toast. Either way, unless you're really good a repairing little things you're going to need to take it to the shop to fix it.

I'd give the rice/silica thing a try at least, but yeah. Water and electronics don't mix.