Swedish researchers studying ways to print loudspeakers and keyboards on paper

Someday consumers may find themselves listening to paper to learn more about products.

 The technology could be used in many ways in addition to advertising, it could
help people with seeing problems use products or provide instructions on taking
medication or even warn children of the risks of smoking cigarettes."

The current prototype uses an electronically conductive ink that
responds to pressure, by a finger or hand, for instance. It also uses printed
speakers created with the conductive ink spread over a material — in this case
aluminium foil — which covers an empty cavity to form a diaphragm. The areas
covered by the conductive ink are linked at the edge of the paper to wires,
which relay the signals to a chip embedded with audio files. The paper printed
with the conductive ink can be recycled or thrown away.

The idea is to be able to print on a large scale, what would make it cheap.