Here's a video from what looks like some kind of tradeshow at the Philips booth where they demonstrate light emitting fabric called lumalive. They have people wearing t-shirts with moving light animations on them, chairs with moving light images in the backs of them, and a couch with the back filled with light moving icons. The video is pretty light on technical details however. As far as I can tell the tshirts look pretty bulky (somewhat like a bulletproof vest). The back of the chair though looks pretty good and the woman even presses in on the light area to show that it isn't just a flat light emitting surface. I'm guess it's either embedded LEDs, electroluminescence, or a flexable LCD.
Check out the video of the light up t-shirts below or click over and view it on the host site.