Patent ID: 8233584

Claim:
A shift register comprising: a control circuit, having a start pulse signal input terminal, a first clock pulse signal input terminal and a power supply voltage input terminal and comprising: a first control transistor, wherein the gate of the first control transistor is electrically coupled to the first clock pulse signal input terminal, the source/drain of the first control transistor is electrically coupled to the power supply voltage input terminal, and the drain/source of the first control transistor is electrically coupled to the gate of the first control transistor through a coupling capacitor; and a second control transistor, wherein the gate of the second control transistor is electrically coupled to the first clock pulse signal input terminal, the source/drain of the second control transistor is electrically coupled to the drain/source of the first control transistor, and the drain/source of the second control transistor is electrically coupled to the start pulse signal input terminal; and a first output transistor, wherein the gate of the first output transistor is electrically coupled to the drain/source of the first control transistor, the source/drain of the first output transistor serves as a gate driving signal output terminal, the drain/source of the first output transistor serves as a second clock pulse signal input terminal; wherein the first control transistor, the second control transistor and the first output transistor all are negative threshold voltage transistors.