The display consists of a layer of electrochromic material sandwiched between two electrode layers. The material changes from one colour to another when stimulated by an electric current. The top electrode layer is made from transparent plastic, so the display can be seen clearly through it.The electrochromic mixture used by Siemens, which enables the screen to work so rapidly, has not been disclosed, but commonly used electrochromic substances include conductive polymers such as polyaniline.
The display is controlled by a printed circuit and can be powered by a very thin printable battery or a photovoltaic cell. The goal is to be able to create the entire device – the display and its power source - using the same printing method, so that manufacturing costs would be as low as possible. Siemens expects to achieve this by 2007.
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