Highly recoverable and robust rollable AMOLED display with smart elastomer materials

A new highly recoverable and robust AMOLED display with a novel double-stacked structure consisting of two smart elastomer layers with high modulus and low modulus was suggested and significantly improved pen drop height from 2 cm to 9.5 cm with additional special treatment for elastomer layer removing electro-static damage on panel image, coming from the increase of gate voltage of 1.2 V due to repeated friction between top layer and bottom layer during cyclic rolling. The top protective layer of elastomer enormously reduced the strain of the panel and PSA and therefore, lessened the deformation height of the rollable display at the edge up to 4 mm after a rolling radius of 15 mm and rolling cycles of 200,000, which looks almost flat. The top protective layer of elastomer with tensile hardening property was able to remarkably increase the energy damping effect for the pen drop test and led to the rise of pen drop height. The unique rolling strain distribution was systematically studied using a strain gauge sensor and simulation tool and validated by experimental results. This novel double-stacked structure also showed outstanding environmental reliability results as well.