Patent ID: 7800575

Claim:
A display device comprising: a plurality of pixels; and a drive circuit which drives the plurality of pixels, wherein the drive circuit includes a shift register circuit, the shift register circuit includes n(n≧2) pieces of basic circuits which are connected vertically in multiple stages, the basic circuit includes a first transistor of a first conductive type having a first electrode to which a clock is applied, a second transistor of a second conductive type different from the first conductive type in a conductive type and having a first electrode to which a second power source voltage is applied; and a third transistor of a first conductive type having a second electrode which is connected to the second electrode of the second transistor and a first electrode to which a first power source voltage different from the second power source voltage is applied; wherein the second electrode of the first transistor is connected to a control electrode of the third transistor, an input signal is applied to a control electrode of the first transistor and a control electrode of the second transistor, a voltage of the second electrode of the third transistor forms a scanning circuit output, a fourth transistor of a second conductive type having a first electrode to which the second power source voltage is applied and a control electrode which is connected to a second electrode of the third transistor, a fifth transistor of a first conductive type having a second electrode which is connected to a second electrode of the fourth transistor and a first electrode to which the first power source voltage is applied, a sixth transistor of a second conductive type having a first electrode to which the second power source voltage is applied and a second electrode which is connected to a control electrode of the fifth transistor, and a seventh transistor of a first conductive type having a second electrode which is connected to a second electrode of the sixth transistor and a first electrode to which the first power source voltage is applied, wherein a voltage of a second electrode of the fifth transistor forms a transfer output, a reset signal is applied to a control electrode of the sixth transistor, and the input signal is applied to a control electrode of the seventh transistor.