Group develops carbon nanotube based flexible display using flexographic printing technology

Sep 17, 2012 by Bob Yirka weblog
Group develops carbon nanotube based flexible display using flexographic printing technology
An array of CNT-TFTs. The PEN substrate measures 15 x 15cm. Credit: Ohno Laboratory of Nagoya University, via Tech-On

(Phys.org)—A group of researchers from Nagoya University and Bando Chemical Industries Ltd has partnered to create a flexible thin film transistor (TFT) display based on carbon nanotubes using flexographic printing technology. The team announced their results at the recent Japan Society of Applied Physics Autumn Meeting in Tokyo.

Flexographic printing is a type of printing that involves using a flexible relief (raised) ink coated plate to apply a wide range of ink types to a wide range of materials (substrates). Product is creating by rolling a substrate though a device allowing for patterns to be applied as it moves. Ink is applied to the plate via a roll and photo curing is used to create the final product. Flexographic printing has become a popular means for printing on a wide variety of materials such as cardboard and plastics and is lauded for its ability to cover wide areas of material with solid even coloring. In this new effort, the research team applied the underlying concepts of flexographic printing to the production of displays in hopes of producing such displays at a higher rate than is achievable by standard methods including ink-jet. They suggest that such a process could be easily implemented as well because of its compatibility with existing roll-to-roll methods.

The team said that besides increased throughput, using the flexographic technique allowed for the production of TFTs at room temperatures and normal air pressure which they say would lower costs in a production environment. The structure of the resulting TFT comes from the creation of flexible via application to a transparent substrate using a floating-catalyst technique which is followed by gas-phase filtering and transfer. The end result is a network that can be used as the basis for a flexible display for computers or hand-held electronic devices. The process also offers a means for creating the points of contact between the TFT and metal wiring that lead to other display components.

The team notes that while the precision of the flexographic technique is slightly lower than that for gravure printing, the pace is higher, allowing for a printing speed of 6.6cm per second.

Explore further: NIST offers electronics industry two ways to snoop on self-organizing molecules

More information:

via Tech-On

Related Stories

Researchers create rollerball-pen ink to draw circuits

Jun 28, 2011

(PhysOrg.com) -- Two professors from the University of Illinois; one specializing in materials science, the other in electrical engineering, have combined their talents to take the idea of printing circuits ...

Recommended for you

Quantum effects in nanometer-scale metallic structures

17 hours ago

Plasmonic devices combine the 'super speed' of optics with the 'super small' of microelectronics. These devices exhibit quantum effects and show promise as possible ultrafast circuit elements, but current ...

User comments : 0