| 摘要 |
Malfunction caused by leakage current of the transistor and shift in threshold voltage is prevented in the shift register in which the signal can be shifted bi-directionally. The bi-directional unit shift register includes a first transistor Q 1 for providing a first clock signal CLK to an output terminal OUT, a second transistor Q 2 for discharging the output terminal OUT based on a second clock signal, third and fourth transistors Q 3 , Q 4 for providing first and second voltage signals Vn, Vr complementary to each other to a first node, which is a gate node of the first transistor Q 1 , and a fifth transistor Q 5 connected between the first node and the output terminal OUT. The fifth transistor Q 5 is in an electrically conducted state based on the first clock signal CLK when the gate of the transistor Q 1 is at L (Low) level.
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