Apparatus and methods of printing on electrically writable media and electrically
writable displays are described. In one aspect, a printer for printing on an electrically
writable medium includes a source of an invisible charge species, and a charge
species projector. The charge species projector is operable to project charge species
from the source onto the medium to electrically reorient switchable display elements
in the medium. In another aspect, a portable storage device that includes a memory
and an electrically writable medium is received. Data is written to the memory
of the portable data storage device. The electrically writable medium of the portable
data storage device is printed on by electrically reorienting switchable display
elements in the medium. In another aspect, an electrically writable display includes
an electrically writable medium that is incorporated into a continuous web having
an outward-facing side and an inward-facing side. The outward-facing side of the
continuous web presents a display surface of the electrically writable medium.
The electrically writable display further includes a scroll system that is operable
to scroll the display surface of the electrically writable medium through a display area.