[nano tech] A4-size Organic TFT Sheet Made With Printing Technology

Feb 19, 2010
Tetsuo Nozawa, Nikkei Electronics
The organic TFT array sheet measuring 6 x 6 inches. AIST developed an A4-size sheet, too.
The organic TFT array sheet measuring 6 x 6 inches. AIST developed an A4-size sheet, too.
[Click to enlarge image]

Japan's National Institute of Advanced Industrial Science and Technologies (AIST) exhibited a flexible organic TFT array sheet and a flexible LCD panel made with the sheet at nano tech 2010, an exhibition that runs from Feb 17 to 19, 2010, in Japan.

AIST developed the sheet in collaboration with Japan Chemical Innovation Institute (JCII), Toppan Printing Co Ltd, Konica Minolta Technology Center Inc and DIC Corp.

AIST announced an organic TFT array sheet measuring 6 x 6 inches in June 2008 (See related article). This time, it made a monochrome polymer network (PN) LCD panel that actually works and an A4-size organic TFT array sheet. The A4-size sheet has a pixel count of 1,600 x 1,200 (equivalent to UXGA) and is the world's largest TFT sheet made by using printing technology, a booth attendant said.

Though the ink material, the printing process (micro-contact printing) and the resolution (up to 200ppi) of the organic TFT array sheet were not significantly changed, the carrier mobility of the semiconductor layer was improved from 10-3cm2/Vs to 0.02-0.03cm2/Vs.

"The mobility is not high enough for fast-moving movies, but it is high enough for electronic book readers," the booth attendant said.