26.3 Design of a Low Power Consumption a‐IGZO TFT‐based Vcom Driver Circuit with Long‐Term Reliability

Abstract

AbstractWe have designed an integrated a‐IGZO TFT‐based Vcom driver circuit with low power consumption, narrow bezel and long‐term reliability on a glass substrate. The proposed driving scheme can achieve 40% lower power consumption than the conventional driving scheme, owing to Vcom inversion. The higher mobility (> 10 cm2/ V.s) of the a‐IGZO TFTs compared to a‐Si:H TFTs allows the integration of smaller size devices in the gate driver circuitry, leading to displays with narrower bezels. AC driving of the buffer TFTs by clocking the nth and (n+1)th frame with 20 and 0 V, respectively, improves the lifetime of the Vcom driver circuit.