E-paper printing system

The e-paper printing system of claim in which the set of electrodes comprises:

• a grounded counter electrode;
• a first shaped electrode having a static potential applied to it sufficient to cause the e-paper to be written to;
• and
• a second shaped electrode held at a static potential sufficient to cause the e-paper to be erased;
• and
• in which relative motion of the c-paper past the first and then the second shaped electrode initially causes:
• the e-paper to be subjected to an electric field sufficient to write to the e-paper;
• the first electric field to be applied to the e-paper at the first rate;
• and
• causes the second electric field to be applied to the e-paper at the second rate.

A method of manufacturing an e-paper erasure device comprising:

• electrically coupling an erasing electrode to a voltage controller;
• the erasing electrode to erase a portion of e-paper;
• in which the erasing electrode is shaped to create a varying gap between a counter electrode so as to cause, during relative motion of the e-paper to the erasing electrode:
• a first electric field to be applied to the e-paper with the magnitude of the first electric field increasing at a first rate sufficiently high to cause the erasure of the portion of the e-paper, and
• at an area downstream where the first electric field is applied to the e-paper, a second electric field to be applied to the e-paper with the magnitude of the second electric field decreasing at a second rate sufficiently low to preserve the erasure of the portion of e-paper.

A computer program product for erasing e-paper, the computer program product comprising:

• a computer readable storage medium comprising computer usable program code embodied therewith, the computer usable program code comprising:
• computer usable program code to, when executed by a processor, cause a first electric field to be applied to the e-paper by a shaped erasing electrode, in which the magnitude of the first electric field increases at a first rate sufficiently high to cause the erasure of a portion of the e-paper;
• and
• computer usable program code to when executed by a processor, cause a second electric field to be applied to the e-paper by the shaped erasing electrode, in which the magnitude of the second electric field decreases at a second rate sufficiently low to preserve a the erasure of the portion of e-paper area.