To provide a semiconductor device capable of preventing current from flowing to a display element during signal writing operation without increasing consumption power and without changing the potential of a power supply line that supplies current to a load for every row.
When a gate-source voltage of a transistor is set by supplying predetermined current to the transistor, the potential of a gate terminal of the transistor is adjusted so as to prevent current from flowing to a load connected to a source terminal of the transistor. Therefore, wiring connected to the gate terminal of the transistor and wiring connected to a drain terminal of the transistor are set to have different potentials. On this occasion, by switching the operation of the transistor, large current is fed to make it difficult to be influenced by cross capacitance generated at the wiring or the like and by wiring resistance, thereby allowing quick setting operation.
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