Gate shift register and organic light emitting diode display including the same

An organic light emitting diode display comprising:

• a display panel including a plurality of gate lines;
• and
• a scan driving circuit configured to drive the plurality of gate lines in accordance with an output of a gate shift register,
• wherein the gate shift register comprises,
• a first stage including a node Q1, a node Qbo, a node M, a first sensing control block configured to activate the node Q1, and a second sensing control block configured to deactivate the node Qbo,
• a second stage including a node Q2, a node Qbe, a third sensing control block configured to activate the node Q2, and a fourth sensing control block configured to deactivate the node Qbe,
• wherein the first and second stages outputting an image display gate pulse during an image data writing period and selectively outputting a sensing gate pulse in a vertical blanking interval in which the image display data is not written, wherein the first and second stages share a portion of circuits of the first and second stages necessary for driving with each other.