Apparatus for information transfer and including a dielectric element having generally opposite first and second surfaces, an information bearing voltage pattern being associated with the first surface and an information bearing charge pattern being associated with the second surface, means for applying...http://www.google.de/patents/US5920334?utm_source=gb-gplus-sharePatent US5920334 - Apparatus and a method for creating an image by applying voltage signals and non-visible charges to a dielectric element
