Foldable OLED displays come in at 5.9 inches
The OLED display, which can be folded in two or three while displaying video, was developed by Semiconductor Energy Laboratory (SEL) Co Ltd, Advanced Film Device (AFD) Inc (a subsidiary of SEL) and Nokia Corp.
One of the two types of display that were demonstrated 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.
The displays were made by forming a release layer, sealing layer and color 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 color filter layer and OLED layer are then attached to each other, and the glass substrates are peeled off and replaced with flexible substrates.
The color filter, TFT and OLED layers are sandwiched between two sets of a sealing layer and flexible substrate. The water vapor transmission rate (WVTR) of the two layers of the adhesive used to attach the sealing layer to the flexible substrate as well as the color 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 2 mm and 4 mm, respectively.
Related articles and links:
www.sel.co.jp/en/index.html
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