Light-emitting device

A light-emitting device comprising:

• a light-emitting element;
• a first switch, a second switch, a third switch and a fourth switch;
• a transistor comprising a source, a drain and a gate, one of the source and the drain being electrically connected to the light-emitting element;
• a capacitor comprising a first electrode electrically connected to one of the source and the drain, and a second electrode electrically connected to the gate through the first switch;
• a first wiring electrically connected to the gate through the second switch and to the second electrode of the capacitor through the first and the second switches;
• a second wiring electrically connected to the second electrode of the capacitor through the third switch and to the second switch through the third and the first switches;
• and
• a voltage control circuit electrically connected to the one of the source and the drain through the fourth switch,
• wherein the voltage control circuit is configured to control a potential applied to the one of the source and the drain so that a difference between a threshold voltage of the transistor and a voltage between the gate and the one of the source and the drain is lower than or equal to 8 V.

A light-emitting device comprising:

• a light-emitting element;
• a first switch, a second switch, a third switch and a fourth switch;
• a transistor comprising a source, a drain and a gate, one of the source and the drain being electrically connected to the light-emitting element;
• a capacitor comprising a first electrode electrically connected to one of the source and the drain, and a second electrode electrically connected to the gate through the first switch;
• a first wiring electrically connected to the gate through the second switch and to the second electrode of the capacitor through the first and the second switches;
• a second wiring electrically connected to the second electrode of the capacitor through the third switch and to the second switch through the third and the first switches;
• and
• a voltage control circuit electrically connected to the one of the source and the drain through the fourth switch.