Display device and driving method of the same

A display device comprising:

• a pixel including a first thin film transistor, a second thin film transistor, a third thin film transistor, a first capacitor, a second capacitor, and a light emitting element;
• a first power source line;
• a second power source line;
• and
• a third power source line,
• wherein one of a source and a drain of the first thin film transistor is electrically connected to the first power source line and the other of the source and the drain of the first thin film transistor is electrically connected to a first electrode of the light emitting element;
• wherein a second electrode of the light emitting element is electrically connected to the second power source line;
• wherein one of a source and a drain of the second thin film transistor is electrically connected to the first electrode of the light emitting element and the other of the source and the drain of the second thin film transistor is directly connected to the third power source line,
• wherein the first capacitor is located between one of the source and the drain of the first thin film transistor and a gate of the first thin film transistor,
• wherein the third thin film transistor is electrically connected in parallel to the first capacitor,
• wherein a gate of the second thin film transistor is electrically connected to a gate of the third thin film transistor,
• wherein the second capacitor is electrically connected in parallel to the light emitting element, and
• wherein a potential of the second power source line is lower than that of the third power source line.

A driving method of a display device comprising:

• a pixel including a first thin film transistor, a second thin film transistor, a third thin film transistor, a capacitor, a first capacitor, and a light emitting element;
• a first power source line;
• a second power source line;
• and
• a third power source line,
• wherein the light emitting element includes a first electrode and a second electrode;
• wherein one of a source and a drain of the first thin film transistor is electrically connected to the first power source line and the other of the source and the drain of the first thin film transistor is electrically connected to a first electrode of the light emitting element,
• wherein the second electrode of the light emitting element is electrically connected to the second power source line,
• wherein one of a source and a drain of the second thin film transistor is electrically connected to the first electrode and the other of the source and the drain of the second thin film transistor is directly connected to the third power source line,
• wherein the capacitor is located between one of the source and a drain of the first thin film transistor and a gate of the first thin film transistor,
• wherein a gate of the second thin film transistor is electrically connected to a gate of the third thin film transistor,
• wherein the third thin film transistor is electrically connected in parallel to the capacitor, the driving method comprising:
• applying a first potential to the first electrode of the light emitting element by turning on the first thin film transistor while a second potential is applied to the second potential to the second electrode of the light emitting element through the second power source line;
• turning off the first thin film transistor and turning on the second thin film transistor and the third thin film transistor;
• and
• applying a third potential to the first electrode of the light emitting element through the third power source line after turning on the second thin film transistor and the third thin film transistor, and
• wherein the third potential is equal to or higher than the second potential and a voltage applied between the first electrode and the second electrode of the light emitting element is lower than a threshold voltage of the light emitting element, and
• wherein the first capacitor is electrically connected in parallel to the light emitting element.

A display device comprising:

• a pixel including a first thin film transistor, a second thin film transistor, a third thin film transistor, and a light emitting element;
• a signal line;
• a first power source line;
• a second power source line;
• and
• a third power source line,
• wherein one of a source and a drain of the first thin film transistor is electrically connected to the signal line and the other of the source and the drain of the first thin film transistor is electrically connected to a gate of the second thin film transistor,
• wherein one of a source and a drain of the second thin film transistor is electrically connected to the first power source line and the other of the source and the drain of the second thin film transistor is electrically connected to a first electrode of the light emitting element,
• wherein one of a source and a drain of the third thin film transistor is electrically connected to the first electrode of the light emitting element and the other of the source and the drain of the third thin film transistor is directly connected to the third power source line,
• wherein a second electrode of the light emitting element is electrically connected to the second power source line, and
• wherein a potential of the second power source line is lower than that of the third power source line.

A display device comprising:

• a pixel including a first thin film transistor, a second thin film transistor, a third thin film transistor, a capacitor, and a light emitting element;
• a signal line;
• a first power source line;
• a second power source line;
• and
• a third power source line,
• wherein one of a source and a drain of the first thin film transistor is electrically connected to the signal line and the other of the source and the drain of the first thin film transistor is electrically connected to a gate of the second thin film transistor,
• wherein one of a source and a drain of the second thin film transistor is electrically connected to the first power source line and the other of the source and the drain of the second thin film transistor is electrically connected to a first electrode of the light emitting element,
• wherein one of a source and a drain of the third thin film transistor is electrically connected to the first electrode of the light emitting element and the other of the source and the drain of the third thin film transistor is directly connected to the third power source line,
• wherein a second electrode of the light emitting element is electrically connected to the second power source line,
• wherein the capacitor is located between one of the source and the drain of the second thin film transistor and the gate of the second thin film transistor, and
• wherein a potential of the second power source line is lower than that of the third power source line.