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Worle J.,PolyIC GmbH and Co. KG | Rost H.,PolyIC
Kunststoffe International | Year: 2010

PolyIC has developed a new process for electrode production, which makes it possible to produce high-resolution, thin conductor tracks by a large scale roll-to-roll operation. By producing high-resolution structures in μm scale on thin flexible PET films, not only sufficient conductivity but also sufficient layer transparency can be achieved. Transparency and conductivity can be adjusted to specific customer requirements by adjusting the area occupancy ratio of the conductive material. They do not need to be transparent themselves, since the necessary light transmission is achieved by the high-resolution structuring. This means that the conductive structure occupies only a fraction of the surface, which allows light impermeable but highly conductive materials such as silver or copper to be used. Through careful adjustment of the process parameters, resistivity values of 0.4 to 1 ohm/sq can be achieved with the conductive materials used. The consistently high transparency achievable over a wide wavelength range is another advantage of this new technology. Source

Ludwig K.,PolyIC GmbH and Co. KG | Rost H.,PolyIC
Kunststoffe International | Year: 2011

Interactive optical labels that can be activated by radio waves are an example of innovative printed electronics with high innovation potential. Such smart labels will in future be used in very diverse areas, such as marketing, brand protection and games with high customer benefit. Source

Woerle J.,PolyIC | Rost H.,Henning Rost
MRS Bulletin | Year: 2011

A number of applications such as displays, touch sensors, and ultrathin heating elements contain flexible and optically transparent plastic films covered with highly electrically conductive coatings. In most cases, indium tin oxide (ITO) is used as the conductive material for these coatings due to its additional property of being transparent to visible light. Once deposited onto the foil, ITO has to be patterned before use, which is generally a tricky, time-consuming, and costly process. A newly developed economical roll-to-roll printing process utilizing metallic grids now offers a direct print alternative with better functional characteristics. © 2011 Materials Research Society. Source

Myny K.,IMEC | Rockele M.,IMEC | Rockele M.,Catholic University of Leuven | Chasin A.,IMEC | And 15 more authors.
IEEE Transactions on Electron Devices | Year: 2014

A bidirectional communication protocol allows radio-frequency identification (RFID) tags to have readout of multiple tags in the RF field without collision of data. In this paper, we realized bidirectional communication between a reader system and thin-film RFID tag by introducing a novel protocol for the uplink communication. Amplitude modulation on the 13.56-MHz base carrier is used to transmit the uplink clock, whereas the data is modulated by varying pulsewidths on this clock. The technology for the thin-film RFID tags combines metal-oxide n-type transistors with organic p-type transistors resulting in a hybrid complementary technology flow. The design of the RFID tag comprises of two metal-oxide transistor rectifiers and a comparator to decode the data transmitted by the reader and different code generators that send 8 bits or 96 bits to the reader. © 1963-2012 IEEE. Source

Myny K.,IMEC | Myny K.,Catholic University of Leuven | Rockele M.,IMEC | Rockele M.,Catholic University of Leuven | And 15 more authors.
Digest of Technical Papers - IEEE International Solid-State Circuits Conference | Year: 2012

The ambition of printing item-level RFID tags is one of the driving forces behind printed electronics research. Organic RFID tags have been shown, initially using p-type organic semiconductors [1-4]. The introduction of n-type organic semiconductors with reasonable performance made organic CMOS conceivable [5] and organic CMOS RFID tags were shown [6]. However, all currently reported organic RFID tags are based on a tag-talks-first principle: as soon as the tag gets powered from the RF field, its code is transmitted at a data rate determined by an internal ring oscillator. Practical RFID systems will need to be able to read multiple RFID tags within the reach of the reader antenna. Existing anti-collision protocols implemented in organic RFID tags [2,4] are limited to about maximum 4 tags and come at the cost of a slow reading time. In this paper, we for the first time realize a reader-talks-first low-temperature thin-film transistor (TFT) RFID circuit. We use a complementary hybrid organic/oxide technology. As organic transistors with reasonable channel lengths (≥2μm) have a cut-off frequency below 13.56MHz, the base carrier frequency of HF communication, present technologies on foil do not yet allow to extract the circuit clock as a fraction of the base carrier. We solve this by introducing an original uplink (reader-to-tag) scheme, in which a slow clock (compatible with our transistors' speed) is transmitted as amplitude-modulation on the base carrier while data is encoded on this clock by pulse width modulation (PWM). © 2012 IEEE. Source

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