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OLED display market gains traction
18 August 2010, News

In recent years, organic light emitting diodes or OLEDs have made considerable waves in the lighting market.

Basically, an OLED is a self-illuminating solid-state device composed of thin films of organic molecules or polymers which are stacked between conductors. A major draw is their thinness, which can be between 100 to 500 nanometres thick or about 200 times smaller than a human hair. This feature provides an exciting possibility for flexible OLED applications.

Worldwide OLED display market forecast (revenue, units and ASPs)
Worldwide OLED display market forecast (revenue, units and ASPs)

Potentially, foldable OLED displays could be attached to fabrics to create electronic ‘smart’ clothing. One example would be outdoor survival clothing with an integrated computer chip, cellphone, GPS receiver and OLED display sewn right into it. Another application would be in flexible e-paper, which would mimic the look and feel of a newspaper page. Once commercialised, the technology would slim down bulky daily newspapers and hopefully save tons in paper, wastewater and carbon emissions. Korea’s LG already announced its own e-paper prototype early in 2010, with more on the horizon.

However, the key road block is actually finding a commercially viable method of manufacturing. Samsung announced its initial version of the technology in 2008. It achieved this through use of a technique that coats the panel with a flexible membrane using an ion gun, ejecting microscopic amounts of itself into a thermodynamically unbalanced cloud of atoms. These then cling to and form a film on anything else in the vacuum chamber. While innovative, this process was difficult to implement on any scale.

Sony then released its own version of the ultra-thin flexible OLED with a different process in May 2010. Sony’s new screen contains innovative organic thin-film transistors that are used to make the driver circuitry to run the display. These transistors are capable of being produced directly onto a flexible substrate, eliminating the need for the rigid driver chips that would prevent the screen from being bent. This new prototype is so flexible that it could even be wrapped around a pencil.

Other methods, including more ‘traditional’ processes such as vacuum thermal evaporation, are also being developed for widespread use. This all equates to a rapidly emerging potential for mass production. Even then, commercial electronics with flexible OLED displays are still a few years away. Also, the first commercial flexible OLED displays would most likely be between only 10 to 15 centimetres in size, with those exceeding 25 centimetres coming much further along. However, the market and technology potential for a whole slew of new OLED applications is certainly here and extremely exciting. Today, OLED displays, both rigid and flexible, continue to grow strongly with display shipments expected to reach 130 million units this year, up from 97 million units last year. The market value is expected to reach $1,4 billion and grow to well over $6 billion by 2015.

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