| 摘要 |
Provided is an EL display device which is provided with a power supply line driver circuit including a transistor having capability in supplying a large amount of current over an insulating substrate where a pixel portion is formed. An active matrix EL display device includes a plurality of pixels, a plurality of signal lines, a plurality of scan lines, and a plurality of power supply lines over an insulating substrate; a transistor formed using an oxide semiconductor with a field-effect mobility of at least higher than or equal to 80 cm2/Vs, preferably higher than or equal to 120 cm2/Vs over the insulating substrate; and a power supply line driver circuit including the transistor as a component.
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