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Samsung reveals flexible AMOLED display features

Posted: 24 Apr 2015     Print Version  Bookmark and Share

Keywords:Samsung Display  AMOLED  smartphone  display  LCD 

Samsung Display has announced essential details pertaining to its latest flexible active-matrix organic light-emitting diode (AMOLED) display used on Galaxy S6 Edge smartphones. Initially released in 2013 with the Galaxy Round smartphone, the company's third generation curved display has a 6.5 radius curvature on each side, a flexibility made possible by using polyimide (PI) as a substrate rather than glass traditionally used in AMOLED panels. The display may be more bendable than a human hair at less than a millimetre thick, according to a recent release.

With the thickness of the AMOLED substrate being less than half the thickness of glass substrates in conventional mobile LCDs, Samsung has been able to deposit an electronic circuit onto it and evaporate a luminant RGB organic device.

Samsung's flexible AMOLED display

Samsung's flexible AMOLED display, outside a handset. (Source: Samsung)

Still, users won't be able to see the extent of AMOLED's flexibility because it is encased in plastic. Paul Semenza, an independent consultant, said the major use case he sees for dynamically flexible displays would be in smaller form factors that could roll up to fit in a pocket or purse.

"If you could ship a device where it was just a piece of plastic that was an OLED, it's incredible. If you can imagine that for your tablet or smartphone, it almost disappears," stated Semenza. "That's what this technology in the real blue sky vision gets to...something light and form-able."

At this point, plastic substrates are still susceptible to oxygen and water vapour and must be encapsulated by glass or another material. The need to encapsulate the OLED is limiting, despite ongoing research in labs, Semenza said.

OLEDs are still one of the best options for achieving full colour and video, as other technologies such as e-ink pose obvious limitations. The AMOLED display on the Galaxy S6 has a 1,440 x 2,560 pixel resolution with a pixel density of 577ppi, a 75 per cent higher density than that of the Galaxy S5. The display has more than 3.6 million RGB organic subpixels on its PI substrate, allowing the user to see finer image detail.

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