NOKIA and Semiconductor Energy Laboratory have developed a display that can be folded in two or three while displaying video.
The foldable display was announced at SID 2014, a conference on display technologies, in San Diego. The companies showed two variants of the display, which is a 5.9 inch OLED panel when unfolded.
The first can be folded in two like a book and has a curvature radius of 2mm, while the second with a curvature radius of 4mm can be folded in three. The displays had a 1280 x 720 pixel count at 249 ppi resolution, and were constructed using a WTC structure that combines white light-emitting OLEDs and a colour filter.
The companies created the display by starting with a glass substrate, upon which is formed a released layer, sealing layer and colour filter layer.
On another piece of glass substrate, a release layer, sealing layer, TFT layer and OLED layer are formed.
The two layered substrates are then sandwiched so the OLED and colour filter layers are attached together, before the glass substrates are peeled off, and replaced with flexible substrates.
The displays can be bent more than 100,000 times.