Patent ID: 8811567

Claim:
A shift register for providing a plurality of gate signals, comprising: an Nth stage shift register unit, comprising: a first pull up unit, having an output end for outputting a first driving control voltage; and a first driving unit, having a control end coupled to the output end of the first pull up unit, a first end for receiving a first clock signal, and a second end coupled to a first gate line, for generating a first gate signal according to the first driving control voltage and the first clock signal; an (N+1)th stage shift register unit, comprising: a second pull up unit, having an output end coupled to the output end of the first pull up unit; a second driving unit, having a control end coupled to the output end of the second pull up unit, a first end for receiving a second clock signal, and a second end coupled to a second gate line, for generating a second gate signal according to the first driving control voltage and the second clock signal; and a first pull down unit, comprising: a third switch, having a first end coupled to the second end of the second driving unit, a control end for receiving a fourth gate signal, and a second end coupled to a common voltage end; and a fourth switch, having a first end coupled to the output end of the second pull up unit, a control end for receiving the fourth gate signal, and a second end coupled to the common voltage end; a first control unit, coupled to the common voltage end, having an input end for receiving a first system signal, and an output end for generating a first control signal; and a first auxiliary pull down unit, comprising: a fifth switch, having a first end coupled to the second gate line, a control end coupled to the output end of the first control unit, and a second end coupled to the common voltage end; and a sixth switch, having a first end coupled to the first gate line, a control end coupled to the output end of the first control unit, and a second end coupled to the common voltage end; wherein N is a positive integer.