Design of a low-power-consumption a-IGZO TFT-based Vcom driver circuit with long-term reliability

An amorphous-InGaZnO (a-IGZO) thin-film transistor (TFT)-based V-com driver circuit that has long-term reliability and can be integrated with the pixel array on a panel has been designed. Owing to the V-com inversion, the power consumed by the proposed driving scheme is 40% less than that consumed by the conventional line-inversion method. The high mobility (>10 cm(2)/V-sec) of the a-IGZO TFTs allows the integration of devices with small channel widths (<750 mu m) and thus keeps the overall device size small, which is important for displays with narrow bezels. The lifetime of the V-com driver is improved by AC driving (by clocking the n-th and (n + 1)-th frame with 20 and 0 V, respectively) of the buffer TFTs.