A novel a-IGZO TFT pixel circuit for flexible AMOLED displays with narrow bezel

In this paper, we present a novel pixel structure with internal compensation function for a-IGZO TFTs OLED displays. Because of pixel circuit need more than two gate signals, the global luminous driver scheme was carried out though turning the pixels’ gate signals, except for scan signal, are provided by source IC instead of GOA circuit. A simple GOA circuit was used to provide the scan signal for data writing just 2 mm layout length. Due to the gate signals of INI and REF are provided by source IC, and required to open all pixels in the whole panel at the same time, the driving loading of INI and REF signals are too large to maintain the high brightness uniformity. Experiment results shown that the brightness uniformity of OLED displays can up to 84% by lowering the VGH voltage of INI and REF with weak feedthrough effect.