| 摘要 |
In a unit drive circuit in each stage in a shift register, a transistor which is maintained in ON state during a period where the unit drive circuit in the stage does not perform an outputting operation is configured not to generate Vth shift. As switches, transistors T6A, T6B are connected between the output terminal OUT and AC power sources VA, VB. At least one of T6A, T6B is brought into ON state and T6A, T6B are alternately brought into OFF state during the period other than the outputting operation period. VA, VB supply L level during a period where T6A, T6B are in ON state, while VA, VB supply a ground potential GND which is an intermediate potential between an H level and an L level during a period where T6A, T6B are in OFF state.
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