Semiconductor device and driving method thereof

A semiconductor device comprising:

• a flexible print circuit;
• a driver circuit;
• and
• a pixel portion comprising:
• a first transistor;
• a second transistor;
• a third transistor;
• a fourth transistor;
• a fifth transistor;
• a first capacitor;
• and
• a light-emitting element,
• wherein a gate of the first transistor is electrically connected to a first electrode of the first capacitor,
• wherein one of a source and a drain of the second transistor is electrically connected to the gate of the first transistor,
• wherein the other of the source and the drain of the second transistor is electrically 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 electrically connected to a second electrode of the first capacitor,
• wherein one of a source and a drain of the fourth transistor is directly connected to the light-emitting element,
• wherein the other of the source and the drain of the fourth transistor is electrically connected to the one of the source and the drain of the first transistor,
• wherein one of a source and a drain of the fifth transistor is electrically connected to the one of the source and the drain of the first transistor,
• wherein the driver circuit is configured to control a gate signal line electrically connected to a gate of the third transistor, and
• wherein the flexible print circuit is electrically connected to the driver circuit.

An electronic device comprising:

• an operation key;
• and
• a display portion comprising:
• a first transistor;
• a second transistor;
• a third transistor;
• a fourth transistor;
• a fifth transistor;
• a first capacitor;
• and
• a light-emitting element,
• wherein a gate of the first transistor is electrically connected to a first electrode of the first capacitor,
• wherein one of a source and a drain of the second transistor is electrically connected to the gate of the first transistor,
• wherein the other of the source and the drain of the second transistor is electrically 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 electrically connected to a second electrode of the first capacitor,
• wherein one of a source and a drain of the fourth transistor is directly connected to the light-emitting element,
• wherein the other of the source and the drain of the fourth transistor is electrically connected to the one of the source and the drain of the first transistor, and
• wherein one of a source and a drain of the fifth transistor is electrically connected to the one of the source and the drain of the first transistor.