Integrated Thin-film Transistors with MicroLED Arrays for Flexible Displays

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Researchers at the University of Waterloo have developed a novel integration technique that combines thin-film transistors (TFTs) with light-emitting diodes (LEDs) onto large-area flexible substrates. The technology incorporates an unique TFT-circuit design and layer transfer process to create electrically stable micro-LED pixels. This technology addresses major challenges to the integration of mico-LEDs onto display backplane arrays and the electrical instability of the pixel transistors in flexible electronic systems. Electrical and optical characterization showed the current-voltage and electroluminescence characteristics of the TFTs and LEDs are not negatively affected by the integration process onto the flexible platforms. This approach provides a potential methodology for enabling flexible and addressable micro-LED arrays for display applications used in wearable and large-area display applications.