88‐2: Distinguished Paper: Extremely Robust Rollable AMOLED Display with Outstanding Surface Quality Using Smart Module and Panel Structure

An extremely robust rollable AMOLED display with excellent surface quality using smart module and panel structure was proposed. Using high energy damping OCA (Optical Clear Adhesive) of PUA (Polyurethane Acryloate) elastomer with high loss tangent significantly increased pen drop height from 4cm to 7cm and angle of pendulum in Charpy test from 68 degree to 120 degree (maximum angle) when estimating side impact property of rollable display module. Applying hybrid‐polymer OC (overcoating) material on and under panel remarkably improved ball drop height from 5cm to 21cm. Replacement of symmetic multi‐joint bar of stainless steel with asymmetric multi‐joint bar of CFRP (Carbon Fiber Reinforced Plastics) greatly improved surface quality and lessened Kc value from 0.8 to 0.44. Smaller Kc value means better surface quality. We also demonstrated IT and automotive rollable display with rolling radius of 7mm and 50 mm, respectively. This rollable AMOLED display has touch integratged panel.