A little science. An idea for OLEDs

OLEDs have been around for a while now. I know there's a long ways to go for OLEDs to reach the ultimate drem of being made on plastic eventually meaning having a 100" screen that you could roll up as a big sheet of paper. Now most development is done on RGB OLEDs, trying to give them longer lifes. So OLEDs currently get along as a second display on a clamshell phone and sometimes a camera's display or a flash MP3's but that's about it. Why not look into white OLEDs? They should be pretty good for lighting up LCD displays of all sizes. Since OLEDs can be made in a similar way as diplays it should provide way better backlighting for LCDs and maybe even enhance an LCDs performance in the sunlight. I would also think that it would make the displays thinner and enhance the battery life of the devices.