Polymeric electrochromics for data storage

Three types of memory devices based on electrochromic polymers are prepared that use variations in optical density in dual type EC devices. In these devices, conducting electrochromic polymers act as the active layer and data is stored by using: (1) high contrast ratio between the oxidized and neutral states of the polymer, (2) different intensities of absorptions at different oxidation levels of polymer and (3) a mixture of any two additive primary colours (red, green and blue) in various oxidation levels.