Mechanically and optically reliable folding structure with a hyperelastic material for seamless foldable displays

Abstract

We report a mechanically and optically robust folding structure to realize a foldable active matrix organic-light-emitting-diode (AMOLED) display without a visible crease at the junction. A nonlinear stress analysis, based on a finite element method, provided an optimized design. The folding-unfolding test on the structure exhibited negligible deterioration of the relative brightness at the junction of the individual panels up to 105 cycles at a folding radius of 1 mm, indicating highly reliable mechanical and optical tolerances. These results demonstrate the feasibility of seamless foldable AMOLED displays, with potentially important technical implications on fabricating large size flexible displays.

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Thin-film organic semiconductor devices: from flexibility to ultraflexibility

“…Lee's group [191] reported a mechanically and optically robust folding structure composed of two individual OLED panels and a hyper elastic silicone rubber to realize a foldable and seamless active matrix OLED (AMOLED) display without a visible crease at the junction. The folding-unfolding test a) Thickness, if available, is indicated in the brackets; b) emitter: host; c) not available; d) the device is also stretchable; e) PH1000:5 v.% DMSO: 0.5 v.% Zonyl on the structure exhibited negligible deterioration of the relative brightness at the junction of the individual panels up to 105 cycles at a folding radius of 1 mm.…”