The displacement of a fluid is controlled electrically in a device employed primarily for storage and display of digital data. The device comprises a capillary space delimited by two confinement plates, the internal faces of which are fitted with electrodes connected to an electric generator. The capillary...http://www.google.de/patents/US4636785?utm_source=gb-gplus-sharePatent US4636785 - Indicator device with electric control of displacement of a fluid
