Active Matrices of Organic Single-Crystal TFTs and Large-Area Flexible Mini-LED Displays

We present a scalable flexible active-matrix mini-LED display, which consists of bezelless 3-mm pitch 30 cm x 30 cm independently operating modules. The backplane is based on high-performance organic single-crystal TFTs laminated on screen-printed large-area plastic substrates. The organic TFTs are separately formed on a polyimide film using photolithography. Since their speed and on-current is crucial on flexible films to operate LED chips with sufficient brightness, we employ high-performance organic single-crystal transistors. The value of the mobility exceeds 10 cm²/Vs. The matrix wirings of silver paint are printed by a large-area screen printing method, so that the vertical and horizontal lines are electrically separated by an insulating layer.