Patent ID: 8553830

Claim:
A shift register comprising a plurality of stages to sequentially output scan pulses through respective output terminals, wherein each of the stages comprises: a pull-up switching unit controlled based on a signal state of a node, and connected between an output terminal and any one among a plurality of clock transmission lines to transmit clock pulses provided with sequential phase differences; and a node controller to control the signal state of the node, and to discharge the node by using a clock pulse from a clock transmission line; wherein the node controller of the current stage comprises: a first switching unit controlled by a start pulse or a scan pulse from a previous stage and connected between the node and a charging voltage source transmission line to transmit a charging voltage source; a second switching unit controlled by the scan pulse from a subsequent stage and connected between the node and any one among the plurality of clock transmission lines, and a third switching unit which is controlled by a clock pulse from any one among the plurality of clock transmission lines and is connected between the node and an output terminal of a previous stage, and the clock pulse supplied to the third switching unit and the scan pulse supplied to the output terminal of the previous stage have the same phase, wherein the second switching unit is turned-on for a non-active state of the clock pulse of the clock transmission line connected to the second switching unit, and the second switching unit and the pull-up switching unit are connected to the same clock transmission line; wherein the current stage includes a first pull-down switch which is controlled by a clock pulse from a clock transmission line from among the plurality of clock transmission lines, and is connected between the output terminal and any one among the plurality of clock transmission lines, wherein the first pull-down switch and the second switching unit are turned-on at the same period, and the source or drain terminal of the first pull-down switch, the second switching unit and the pull-up switch are connected to the same clock transmission line.