Patent ID: 7859488
Filing Date: 2010-12-28
Classification: G09G,H01L

Abstract:
1. A semiconductor device comprising: a first wire; a second wire; a third wire; a sixth wire; a first switch; a second switch; a first electrode; a layer containing an organic compound provided over the first electrode; a second electrode provided over the layer containing the organic compound; a shift transistor, wherein a first terminal of the shift transistor is electrically connected to the first wire, and a gate terminal of the shift transistor is electrically connected to the second wire via the first switch; a current source transistor, wherein a second terminal of the current source transistor is electrically connected to a second terminal of the shift transistor, a gate terminal of the current source transistor is electrically connected to the second wire via the first switch, a first terminal of the current source transistor is electrically connected to the first electrode and is electrically connected to the third wire via the second switch; a capacitor element electrically connected between the gate terminal of the current source transistor and the first terminal of the current source transistor; means for short circuiting between the first terminal of the shift transistor and the second terminal of the shift transistor; and a rectifying element connected between the sixth wire and the gate terminal of the current source transistor, wherein, when a L level signal is input to the sixth wire, a forward direction current flows in a direction from the gate terminal of the current source transistor to the sixth wire to make a potential of the gate terminal of the current source transistor a potential higher than the L level by a forward threshold voltage of the rectifying element and to accumulate a charge in the capacitor element and increase a potential of the first terminal of the current source transistor, to thereby turn off the current source transistor.