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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.

A new seamless foldable OLED display composed of multi display panels is proposed. To verify seamless viewing and robust foldingunfolding reliability, a 138 ppi resolution, 5.4” diagonal size AMOLED seamless foldable display prototype is fabricated.

We report an AMOLED fabricated with a solution‐processed indium zinc oxide (IZO) thin‐film transistor (TFT) backplane. The TFT has a bottom gate structure with SiNx gate insulator, spin‐coated IZO active layer, Mo source/drain electrode, and SiO2 passivation layer. The TFT exhibited the field effect mobility of 0.9 cm2/Vs, threshold voltage of 13.6 V, and high on/off current ratio of 1.8e7.