5 research outputs found

    Control of registration accuracy of R2R gravure for fabricating inexpensive electronic devices

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    The errors of the overlay printing registration in roll-to-roll (R2R) gravure are generated from many sources such as uneven web tension, thermal expansion and contraction of plastic web, uneven impression roll pressure, slipping the web, uneven circumference of the roll, unmatched speed between web transfer, printing roll, and so forth. Among those things, the most influential factors to exert on overlay printing registration in R2R gravure should be defined and analyzed to provide servomechanism to control at least ±20 µm of registration accuracy of R2R gravure with more than 4 m/min of web transfer speed. In this paper, we would like to present the general way of control system of R2R gravure to maintain the overlay printing registration of ±20 µm under various web transfer speeds, roll pressure and uneven web tension

    A fully roll-to-roll gravure-printed carbon nanotube-based active matrix for multi-touch sensors.

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    Roll-to-roll (R2R) printing has been pursued as a commercially viable high-throughput technology to manufacture flexible, disposable, and inexpensive printed electronic devices. However, in recent years, pessimism has prevailed because of the barriers faced when attempting to fabricate and integrate thin film transistors (TFTs) using an R2R printing method. In this paper, we report 20 × 20 active matrices (AMs) based on single-walled carbon nanotubes (SWCNTs) with a resolution of 9.3 points per inch (ppi) resolution, obtained using a fully R2R gravure printing process. By using SWCNTs as the semiconducting layer and poly(ethylene terephthalate) (PET) as the substrate, we have obtained a device yield above 98%, and extracted the key scalability factors required for a feasible R2R gravure manufacturing process. Multi-touch sensor arrays were achieved by laminating a pressure sensitive rubber onto the SWCNT-TFT AM. This R2R gravure printing system overcomes the barriers associated with the registration accuracy of printing each layer and the variation of the threshold voltage (Vth). By overcoming these barriers, the R2R gravure printing method can be viable as an advanced manufacturing technology, thus enabling the high-throughput production of flexible, disposable, and human-interactive cutting-edge electronic devices based on SWCNT-TFT AMs
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