Access the latest quantum technology

Quantum technology in Bristol and bath - find out more about how you can access the commercialisation of quantum technology for sensing and security

Monday, August 28, 2017

Embedding OLEDs in fabric for wearable displays

By Nick Flaherty

A research team led by Professor Kyung Cheol Choi at the School of Electrical Engineering at KAIST in South Korea has developed wearable OLED (organic light-emitting diode) displays for various applications including fashion, IT, and healthcare.

The team used two different approaches, fabric-type and fibre-type, for clothing-shaped wearable displays. In 2015, the team successfully laminated a thin planarization sheet thermally onto fabric to form a surface that is compatible with the OLEDs approximately 200nm thick. Also, the team reported their research outcomes on enhancing the reliability of operating fibre-based OLEDs. In 2016, the team introduced a dip-coating method, capable of uniformly depositing layers, to develop polymer light-emitting diodes, which show high luminance even on thin fabric.

Working with local materials company KOLON Glotech, Seungyeop Choi used the resesearch to develop the fabric-based OLEDs, showing high luminance and efficiency while maintaining the flexibility of the fabric.

The long-term reliability of this wearable device that has the world's best electrical and optical characteristics was verified through their self-developed, organic and inorganic encapsulation technology. According to the team, their wearable device facilitates the operation of OLEDs even at a bending radius of 2mm.

"Having wavy structures and empty spaces, fibre plays a significant role in lowering the mechanical stress on the OLEDs," said Prof Choi. "Screen displayed on our daily clothing is no longer a future technology. Light-emitting clothes will have considerable influence on not only the e-textile industry but also the automobile and healthcare industries."

The team believes these OLEDs have the world's best luminance and efficiency and are the most flexible fabric-based light-emitting device among those reported.

Related stories:

No comments: