Semiconductor device and driving method thereof

A semiconductor device comprising:

• a pixel comprising:
• a first transistor;
• a second transistor;
• a third transistor;
• a fourth transistor;
• a fifth transistor;
• a sixth transistor;
• an electroluminescent device;
• and
• a capacitor,
• wherein a gate of the first transistor is directly connected to a first electrode of the capacitor,
• wherein a second electrode of the capacitor is directly connected to the electroluminescent device,
• wherein one of a source and a drain of the second transistor is directly connected to a source signal line,
• wherein the other of the source and the drain of the second transistor is directly connected to one of a source and a drain of the first transistor,
• wherein one of a source and a drain of the third transistor is directly connected to the gate of the first transistor,
• wherein the other of the source and the drain of the third transistor is directly connected to the other of the source and the drain of the first transistor,
• wherein one of a source and a drain of the fourth transistor is directly connected to the one of the source and the drain of the first transistor,
• wherein the other of the source and the drain of the fourth transistor is directly connected to the electroluminescent device,
• wherein one of a source and a drain of the fifth transistor is directly connected to the other of the source and the drain of the first transistor,
• wherein the other of the source and the drain of the fifth transistor is directly connected to an electric current supply line,
• wherein one of a source and a drain of the sixth transistor is directly connected to the second electrode of the capacitor, and
• wherein the other of the source and the drain of the sixth transistor is directly connected to an electric power source line.

A driving method for a semiconductor device comprising a pixel, wherein the pixel comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, an electroluminescent device, and a capacitor, wherein a gate of the first transistor is electrically connected to the electroluminescent device via the capacitor, wherein one of a source and a drain of the first transistor is electrically connected to a source signal line via the second transistor, wherein the other of the source and the drain of the first transistor is electrically connected to a gate of the first transistor via the third transistor, wherein the one of the source and the drain of the first transistor is electrically connected to the electroluminescent device via the fourth transistor, wherein the other of the source and the drain of the first transistor is electrically connected to an electric current supply line via the fifth transistor, and wherein the gate of the first transistor is electrically connected to an electric power source line via the capacitor and the sixth transistor, the driving method comprising the steps of:

• putting the pixel into a first state in which the second transistor, the third transistor, the fifth transistor, and the sixth transistor are in on-state and the fourth transistor is in off-state;
• putting the pixel into a second state in which the second transistor, the third transistor, and the sixth transistor are in on-state and the fourth transistor and the fifth transistor are in off-state;
• and
• putting the pixel into a third state in which the fourth transistor and the fifth transistor are in on-state and the second transistor, the third transistor, and the sixth transistor are in off-state.