Path: EDN Asia >> News Centre >> Industrial/Mil/Aero >> CPI process bends OTFT for flexible AMOLED displays
Industrial/Mil/Aero Share print

CPI process bends OTFT for flexible AMOLED displays

28 Jan 2014  | Paul Buckley

Share this page with your friends

The Centre for Process Innovation (CPI) in the United Kingdom has developed backplane fabrication processes to allow the bending of organic thin film transistor (OTFT) arrays to small radii (1 mm) without reducing device performance. The research is showing progress towards optimum organic semiconductor (OSC)/OTFT processing and performance to allow their integration into ultra-flexible active matrix organic light emitting diode (AMOLED) displays. High-performance OSC materials with charge mobility suitable for OLED driving were used in the tests on 50 micron thick PEN film, the company said.

In order to achieve the tight bend radius, the multiple interfaces present in the device stack were optimised to allow good adhesion under the strains experienced in the bending test. Using patterned OSC layers and additional passivation layer processing, display pixel size OTFTs were fabricated and these were repeatedly bent (up to 10,000 times) to a radius of 1 mm, which equates to a strain of 2.5 per cent. Minimal change in the turn on voltage and on current was observed for the elongated cycle test.

The demonstration of bend resistance in high performance OTFT devices is part of ongoing work to integrate these materials into active matrix backplanes for AMOLED. It is expected that within 2014, the first plastic based display demonstrators will be completed using OTFT in project ROBOLED, which has received funding through the Technology Strategy Board.

CPI is the UK's National Centre for Printable Electronics. Focused on the development, scale-up, and commercialisation of printable electronics applications, CPI is equipped with a range of assets specifically chosen and developed to allow clients to understand how their products and processes perform under pilot manufacturing conditions.




Want to more of this to be delivered to you for FREE?

Subscribe to EDN Asia alerts and receive the latest design ideas and product news in your inbox.

Got to make sure you're not a robot. Please enter the code displayed on the right.

Time to activate your subscription - it's easy!

We have sent an activate request to your registerd e-email. Simply click on the link to activate your subscription.

We're doing this to protect your privacy and ensure you successfully receive your e-mail alerts.


Add New Comment
Visitor (To avoid code verification, simply login or register with us. It is fast and free!)
*Verify code:
Tech Impact

Regional Roundup
Control this smart glass with the blink of an eye
K-Glass 2 detects users' eye movements to point the cursor to recognise computer icons or objects in the Internet, and uses winks for commands. The researchers call this interface the "i-Mouse."

GlobalFoundries extends grants to Singapore students
ARM, Tencent Games team up to improve mobile gaming


News | Products | Design Features | Regional Roundup | Tech Impact