Do bright-coloured desktop wallpapers shorten the lifespan of LCD monitors or am I just being paranoid?

I'm using a white, glossified desktop that perfectly compliments BoOzo's excellent, newest version of Smoothstripes. My whole screen is pretty white. Planes could probably land by it!

That being said, I even keep my screen's brightness settings a little on the dark side, thinking it's going to help in the longterm.

Thoughts!?