Display device and driving method

A display device comprising:

• a controller;
• and
• a plurality of pixels arranged in a matrix,
• wherein each of the plurality of pixels includes:
• a light emitting element;
• a capacitor for storing voltage;
• a drive transistor that provides, to the light emitting element, a current corresponding to the voltage stored in the capacitor to cause the light emitting element to emit light;
• a voltage supplier that applies a reference voltage to the drive transistor in an initialization period, and applies a reverse bias voltage to the drive transistor in a predetermined period before the initialization period, the reference voltage being higher than a threshold voltage of the drive transistor and providing a forward bias between a gate electrode and a source electrode of the drive transistor, the initialization period being a period for initializing the pixel, the reverse bias voltage providing a reverse bias between the gate electrode and the source electrode of the drive transistor, the predetermined period being included in a period in which the light emitting element does not emit light;
• a first switch that electrically connects a second electrode of the capacitor and a first power line in the initialization period and in the predetermined period;
• a second switch that is turned ON and OFF to electrically connect and disconnect a signal line for providing a data signal voltage and a first electrode of the capacitor;
• and
• a third switch that is turned ON and OFF to electrically connect and disconnect the first electrode of the capacitor and the gate electrode of the drive transistor,
• the voltage supplier includes:
• a power selection switch that selects a second power line or a third power line to provide the reference voltage or the reverse bias voltage, the second power line providing the reference voltage, the third power line providing the reverse bias voltage;
• and
• a fourth switch that is turned ON and OFF to electrically connect and disconnect the power selection switch and the gate electrode of the drive transistor, and
• the source electrode of the drive transistor is electrically connected to the second electrode of the capacitor and an anode of the light emitting element, and
• wherein the controller:
• in the predetermined period,
• maintains the fourth switch ON while maintaining the second switch OFF, the third switch ON, and the first switch ON, and selects the third power line through the power selection switch to provide the reverse bias voltage;
• and
• in the initialization period,
• maintains the fourth switch ON while maintaining the second switch OFF, the third switch ON, and the first switch ON, and selects the second power line through the power selection switch to provide the reference voltage.