Development of an electronic paper prototype on bacterial cellulose using electrochromic systems

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Date

2004-05-22

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Shah, Jay, 1980-

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Abstract

Various techniques were explored to develop an electronic paper prototype on bacterial cellulose. Electrochromic systems were used to demonstrate the proof of concept of a dynamic display on cellulose. Bacterial cellulose was synthesized in a culture of NQ-5 strain of Acetobacter xylinum in the standard glucose-rich (SH) medium. Bacterial cellulose thus formed was dimensionally stable, had a paper-like appearance and had a unique microfibrillar nanostructure. This bacterial cellulose was made an electrically conducting (or semi-conducting) sheet by deposition of conductors around the microfibrils to provide conducting pathways and then immobilizing electrochromic dyes into the microstructure. The whole system was then cased between transparent electrodes in three different device structures. Upon application of switching potentials (2-6V); a reversible color change was demonstrated down to a standard pixel sized area (~100μm²). The major advantages of such a prototype are its high paper-like reflectivity, flexibility, contrast, biodegradability, low power consumption etc. among many more. Ways to integrate these prototypes to full scale displays were explored. Potential future applications of this concept are E-book tablets, E-newspapers, dynamic wall papers, rewritable maps and learning tools

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