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Optoelectronics/Displays  

Nokia demos two-fold, three-fold OLED displays

Posted: 16 Jun 2014     Print Version  Bookmark and Share

Keywords:Nokia  OLED display  Semiconductor Energy Laboratory  Advanced Film Device 

Nokia Corp. has recently demonstrated innovative flexible OLED displays that can be folded in two or three while displaying video. It was developed by Semiconductor Energy Laboratory (SEL) Co Ltd, Advanced Film Device (AFD) Inc. (a subsidiary of SEL) and Nokia.

One of the two types of display that were shown was a 'book-type' display that can be folded in two like a book. The other unit was a 'three-fold' display that can be folded in three.

Both displays were 5.9-inch OLED panels when unfolded and featured a pixel count and resolution of 1,280 x 720 and 249ppi, respectively.

Nokia demos two-fold, three-fold OLED displays

Nokia's OLED displays can be folded in two or three while displaying video.

The displays were made by forming a release layer, sealing layer and colour filter layer on a glass substrate. A release layer, sealing layer, TFT layer and OLED layer are also formed in that order on another glass substrate. The colour filter layer and OLED layer are then attached to each other, and the glass substrates are peeled off and replaced with flexible substrates.

The colour filter, TFT and OLED layers are sandwiched between two sets of a sealing layer and flexible substrate. The water vapour transmission rate (WVTR) of the two layers of the adhesive used to attach the sealing layer to the flexible substrate as well as the colour filter to the OLED layer is claimed to be as high as 7 x 10-7g/m2/day.

The book-type and three-fold displays claim they can be bent more than 100,000 times and are capable of being bent up to curvature radii of 2mm and 4mm, respectively.

- Paul Buckley
  EE Times Europe





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