DISPOSITIF REPRODUCTEUR D'IMAGES

摘要

The invention relates to an image display apparatus provided with at least two electrodes to which a direct voltage or a square-wave or alternating voltage may be applied. The electrodes are in contact with a solution of a reversible reducible organic substance of the formula I and an adjuvant. Suitable adjuvants are substituted hydroquinones, ferrous salts and 1,4-di (dialkylamino) benzenes. When the voltage is applied compounds of the formula I are reduced to intensely coloured radical ions. Oxidation of the adjuvant takes place at the anode.