There's even a silly backlight for several face buttons, should you be playing video games in a cave (you can opt to turn off the backlight, too -- we certainly did).
"The polarizing organic photovoltaic cell demonstrated by Professor Yang's research group can potentially harvest 75 percent of the wasted photons from LCD backlight and turn them back into electricity, " said Youssry Boutros, program director for the Intel Labs Academic Research Office, which supported the research.