Patent ID: 8872739

Claim:
A semiconductor device comprising: a first transistor; a second transistor; a third transistor; a fourth transistor; a fifth transistor; a capacitor; a pixel electrode; a first line, a second line; a third line; and a fourth line, wherein a first terminal of the third transistor is electrically connected to a gate electrode of the first transistor and a first terminal of the fifth transistor, wherein a first terminal of the first transistor is electrically connected to a first terminal of the fourth transistor, a first electrode of the capacitor, and the pixel electrode, wherein a second electrode of the capacitor is electrically connected to a second terminal of the fifth transistor, and a first terminal of the second transistor, wherein a second terminal of the first transistor is electrically connected to the first line, wherein a second terminal of the third transistor is electrically connected to the second line, wherein a second terminal of the second transistor is electrically connected to the third line, whereint a second terminal of the fourth transistor is electrically connected to the fourth line, and wherein a channel forming region of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor includes indium, gallium, zinc and oxygen.