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Printed passive matrix addressed electrochromic displays
Acreo AB, Norrköping, Sweden .
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-4791-4785
2013 (English)In: Organic electronics, ISSN 1566-1199, Vol. 14, no 12, 3371-3378 p.Article in journal (Refereed) Published
Abstract [en]

Flexible displays are attracting considerable attention as a visual interface for applications such as in electronic papers and paper electronics. Passive or active matrix-addressing of individual pixels require display elements that include proper signal addressability, which is typically provided by non-linear device characteristics or by incorporating transistors into each pixel, respectively. Including such additional devices into each pixel element make manufacturing of flexible displays using adequate printing techniques very hard or even impossible. Here, we report all-printed passive matrix-addressed electrochromic displays (PMAD) that can be manufactured using standard printing tools. Poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS) serves as the conducting and electrochromic pixel electrodes and carbon paste is used as the pixel counter electrodes. These electrodes sandwich self-assembled layers of a polyelectrolyte that are confined to desired pixel areas via surface energy patterning. The particular choice of materials results in a desired current vs. voltage threshold that enables addressability in electronic cross-point matrices. The resulting PMAD, built up from a robust architecture including only few different materials, operates at less than 3 V, exhibits high color switch contrast without any cross-talk promises for high-volume and low-cost production of flexible displays using reel-to-reel printing tools on plastic foils and on paper.

Place, publisher, year, edition, pages
2013. Vol. 14, no 12, 3371-3378 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-91270DOI: 10.1016/j.orgel.2013.10.008ISI: 000327146500031OAI: diva2:616751

Funding agencies|Lintec Corporation||

Available from: 2013-04-18 Created: 2013-04-18 Last updated: 2015-05-06Bibliographically approved
In thesis
1. Novel architectures for flexible electrochemical devices and systems
Open this publication in new window or tab >>Novel architectures for flexible electrochemical devices and systems
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Electrically conducting polymers were discovered in the late 1970s. This finding generated a whole new research area named organic electronics, an area which has attracted great interest and tremendous achievements, in terms of devices and applications, have been reached by different research groups all over the world. Replacing inorganic materials by their organic counterparts in various kinds of electronic devices provides novel device functionalities as well as new opportunities in device manufacturing. One of the major advantages of utilizing organic materials in electronic devices is the high degree of freedom regarding fabrication methods. Since organic materials can be processed from solution various printing, coating and lamination techniques can be used to manufacture entire electronic systems on flexible carriers and substrates in a truly reel-to-reel fashion.

The main theme of this thesis relates to exploring novel device architectures to enable easy manufacturing of flexible electrochromic displays based on organic materials. After the introduction, the second part of the thesis treats some of the fundamentals of conducting polymers, and the third part explains the building blocks of matrix-addressed electrochromic displays: those systems combine electrochemical transistors and electrochromic display pixels. A brief introduction to printed electronics is also given in the fourth section. Then, active matrix addressed displays utilizing electronic vias manufactured through the substrate, which enable to use the substrate more efficiently in the resulting three-dimensional architecture, are presented in the fifth section. This novel system arrangement results in a matrix-addressed display with a relatively high fill-factor since its subcomponents are located on opposite sides of the substrate. The sixth section of the thesis is related to the achievement of passive matrix addressed displays. The architecture and the manufacturing process of these electrochromic displays are both very simple: an electrolyte is sandwiched in between the counter and the pixel electrode layers. The electrode materials chosen results in a non-linear current versus voltage characteristics, which enables matrix addressability also without the transistors. At last, in the seventh section, nanofibrillated cellulose (NFC) is used as the scaffold for either an electroactive polymer or the electrolyte. Various components, such as electrochromic pixels and electrochemical transistors, can be built from the resulting solid films thanks to the stable, soft and tacky properties of the hybridized NFC layer. Hence, a new concept for integration and reconfiguration of electronic systems consisting of electrochemical devices is achieved.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 70 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1508
National Category
Engineering and Technology
urn:nbn:se:liu:diva-91273 (URN)978-91-7519-657-2 (print) (ISBN)
Public defence
2013-05-21, K1, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Available from: 2013-08-22 Created: 2013-04-18 Last updated: 2015-05-06Bibliographically approved

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