Patent ID: 7778379

Claim:
A shift register apparatus, comprising: a plurality of shift registers connected in series, each of the shift registers comprising a pull-up unit, a control unit and a pull-down, wherein: the pull-up unit of the i th shift register correspondingly receives a clock signal and a first scan signal outputted from the (i−1) th shift register, and provides a pull-up signal accordingly and determines whether a second scan signal is outputted or not; the control unit of the i th shift register receives the clock signal and the pull-up signal, and outputs a second control signal accordingly; and the pull-down unit of the i th shift register is coupled to the pull-up unit and the control unit of the i th shift register and the control unit of the (i−1) th shift register, for receiving and controlled by the second control signal, a first control signal outputted from the control unit of the (i−1) th shift register, and a fourth scan signal outputted from the (i+2) th shift register, wherein when the i th shift register does not output the second scan signal, the i th shift register stably outputs a reference voltage by the pull-down unit of the i th shift register, where i is a positive integer which is greater than or equal to 2.