Inkjet printed active element on paper based on conductive and thermochromic materials

Liisa Hakola, Kim Eiroma, Jali Heilmann, Kaisa Lehtinen, Tapio Mäkelä, Marja Vilkman

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


Inkjet printing is a suitable technology for fabricating rapidly and inexpensively electronic structures that contain layers made of different inks. It is easy to integrate several printheads together for printing multiple inks and these printheads don't require much space when compared to, for example, conventional printing units. Inkjet printing also has a very low material consumption which makes it possible to jet typically very expensive conductive inks. Therefore inkjet printing enables printing of inexpensive active electronic elements even on such low-cost products as packages or other paper-based products. VTT has developed and fabricated a game demonstrator that consists of six ink layers all inkjet printed. The layers were made from conductive, dielectric, thermochromic and regular inks printed on a paper substrate. The concept of the game was that a question and three alternatives for the correct answer were presented. When pressing any of the alternative answers, electrical contact between two ink layers triggered a colour-change reaction exposing whether the chosen answer was correct or incorrect. The reaction occurred in a couple of seconds. Although a working demonstrator was realized challenges still remain for the fabrication of an inexpensive, preferably inkjet printed, power source.
Original languageEnglish
Title of host publication23rd International Conference on Digital Printing Technologies and Digital Fabrication, NIP 23
Subtitle of host publicationTechnical Program and Proceedings
EditorsS. di Risio, N. Yan
Place of PublicationSpringfield
PublisherThe Society for Imaging Science and Technology, IS&T
ISBN (Print)978-0-89208-273-5
Publication statusPublished - 2007
MoE publication typeA4 Article in a conference publication
Event23rd International Conference on Digital Printing Technologies: Digital Fabrication 2007 - Anchorage, United States
Duration: 16 Sept 200721 Sept 2007


Conference23rd International Conference on Digital Printing Technologies
Country/TerritoryUnited States


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