Transparent, Flexible and Passive Thermal Touch Panel

Mikko Ruoho, Taneli Juntunen, Tapani Alasaarela, Marko Pudas, Ilkka Tittonen

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)


This work presents a touch panel concept, which is enabled by a novel design of thin film thermocouples. The design offers a simple implementation by utilizing a single thin film to function as an array of thermocouples. The concept is demonstrated as a flexible, passive, and highly transparent touch panel. The passive nature of the thermoelectric touch recognition allows the
performance of the presented sensor to be optimal at moderate sheet resistance values of the transparent conductive layers. Hence, the concept is highly potential for low-cost large-area applications and does not rely on costly low sheet resistance materials such as indium tin oxide. The demonstrator presented in this work achieves a signal-to-noise ratio of 20 with a rise time
of 90 ms and is able to distinguish individual touches, sweeping with finger, as well as touching by multiple fingers at the same time. In addition, the concept may also be used in other thermal distribution mapping applications.
Original languageEnglish
Number of pages6
Journal Advanced Materials Technologies
Issue number9
Early online date19 Oct 2016
Publication statusPublished - Dec 2016
MoE publication typeA1 Journal article-refereed

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