An electronic paper file with an advantage like a book or a notebook can settle a conventional problem regarding the displaying that appears at a time of communicating by a portable information terminal. The switch circuitry is configured for coupling to input and output interfaces of the computers and is configured for switching a set of input and output interface couplings to one of the computers. The pixel elements are formed of a transparent conductive material and are separated by inter-pixel regions formed of a non-conductive material. The collector is configured to collect the ions created by the plurality of transmission pins and output a collector signal.