To display, a gate driving device may be used in some displays.
Taking a liquid crystal display as an example, at time of displaying images, the liquid crystal display often employs a progressive scan manner in which ON and OFF of thin film transistors (TFTs) in each row of sub-pixel areas are controlled by a gate-line, and a gate driving signal for driving the gates of respective TFTs is generated by a gate driving device which typically includes a plurality of shift register units.
A shift register unit generally includes a plurality of TFTs. In conjunction with a clock signal, a frame starting signal and a reset signal or the like that are inputted, the plurality of TFTs generate a gate driving signal which is to be transmitted to TFTs as switching elements in the sub-pixel areas on the array substrate.
A junction may be formed by at least two of these TFTs, and some junctions may be at high level for a long time. In this way, some TFTs, whose gates are connected to these junctions, may be under a relatively large bias voltage for a long time, hence lifespan of those TFTs, whose gates are connected to these junctions, is reduced, and stability of shift register unit is badly influenced.