E-ink displays are great in sunlight, but useless in the dark.
So with hopes of ridding the world of stupid reading lamps, this
super thin film promises to add a front light to your e-reader
without sacrificing its battery life.  Depending on the size of
the device, Flex Lighting's light guide film can evenly
illuminate an entire e-ink display with just a single LED light
source tucked away at the side. It not only helps keep the
device thin, but also means there's a minimal draw on its
battery. When used on e-Readers the film is laminated directly
to the display, but since it's as thin as 50 microns it's
completely invisible and doesn't hinder touch functionality.
Flex Lighting has yet to announce any partnerships with major
e-Reader manufacturers, but the film can apparently also be used
in backlit displays like LCDs providing the same power and space
saving benefits. Because it's so flexible, it can even be used
in the roll-up electronic displays that science fiction writers
thought we'd be using by now.