Patent ID: 7880714

Claim:
A shift register, comprising: a plurality of stages dependently connected to each other, wherein each stage is configured to independently generate first and second scan pulses such that the first scan pulse is simultaneously applied to a previous stage and to a gate line corresponding to the stage of a liquid crystal panel, and the second scan pulse is applied to a next stage, and wherein each stage includes: a node controller configured to control charging/discharging operations of first and second nodes; a first output unit configured to select one of the first scan pulse and a ground voltage signal according to states of the first and second nodes and configured to transmit the selected signal to the corresponding gate line and to the previous stage simultaneously; and a second output unit configured to select one of the second scan pulse and the ground voltage according to the states of the first and second nodes and configured to transmit the selected signal to the next stage, wherein the node controller includes: a first switching element configured to charge the first node in response to a start pulse or in response to the second scan pulse generated from the second output unit of the previous stage; a second switching element configured to discharge the second node in response to the start pulse or in response to the second scan pulse generated from the second output unit of the previous stage; a third switching element configured to charge the second node in response to a clock pulse delayed by two pulse widths compared with the second scan pulse received from the previous stage; and a fourth switching element configured to discharge the first node when the second node is charged.