A 6-TFT Charge-Transfer Self-Compensating Pixel Circuit for Flexible Displays

In this work, a self-compensating 6-TFT pixel circuit with special layout considerations has been proposed to mitigate the impact of the electrical instability of a-Si:H TFTs as well as applied mechanical strain. The proposed pixel circuit has been fabricated onto flexible polyethylene naphthalate (PEN) substrate and the measurement results demonstrated less than ±3% variation of its output current after an accelerated 24-hour stress test under flat, tensile strain, and compressive strain conditions. In addition, the proposed pixel circuit only required a pair of signals to operate, which reduced the complexity on external IC drivers.