The electrochromic changes of the polyaniline (PANI) have been studied with vis-spectoscopy. The electropolymerisation of PANI -was carried out in hydrochloridic acid (HCl) by cyclic voltammetry, and the deposited film was measured during protonation from the reduced and oxidated form switching between at different voltage and different switching speed. It is shown, that the colour transmission changes depends from the switching speed, due to the ion movement to/from the film layer from/to the electrolyte solution, and acts as a possible limit of application. Colour transmission changing could be used in flat and flexible indicator devices in low power applications. It is shown, that due to the limits present in the system there are possible applications for such devices in display technology.
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