Method for driving display element, display device, and electronic device

A display device, comprising:

• a display unit in which a display element is disposed, the display element including an n-channel drive transistor in which a voltage is applied to one source/drain region and a light-emitting unit is connected to another source/drain region, and a capacitor connected between a gate electrode of the n-channel drive transistor and the other source/drain region;
• and
• a drive unit that drives the display unit, wherein the drive unit
• performs threshold voltage cancellation processing that applies a drive voltage to the one source/drain region in a state where a reference voltage is applied to the gate electrode of the n-channel drive transistor, to bring a potential of the other source/drain region closer to a potential obtained by subtracting a threshold voltage of the n-channel drive transistor from the reference voltage,
• subsequently, sets the gate electrode of the n-channel drive transistor in a floating state, and changes a potential of the gate electrode in the floating state via a parasitic capacitance and causes a current to flow via the n-channel drive transistor to increase a voltage between the other source/drain region and the gate electrode, and then applies the reference voltage to the gate electrode of the n-channel drive transistor,
• afterwards, performs write processing that applies a video signal voltage to the gate electrode of the n-channel drive transistor, and
• subsequently, sets the gate electrode of the n-channel drive transistor in the floating state to cause the light-emitting unit to emit light.

An electronic device comprising:

• a display device, wherein the display device includes:
• a display unit in which a display element is disposed, the display element including an n-channel drive transistor in which a voltage is applied to one source/drain region and a light-emitting unit is connected to another source/drain region, and a capacitor connected between a gate electrode of the n-channel drive transistor and the other source/drain region;
• and a drive unit that drives the display unit, wherein the drive unit
• performs threshold voltage cancellation processing that applies a drive voltage to the one source/drain region in a state where a reference voltage is applied to the gate electrode of the n-channel drive transistor, to bring a potential of the other source/drain region closer to a potential obtained by subtracting a threshold voltage of the n-channel drive transistor from the reference voltage,
• subsequently, sets the gate electrode of the n-channel drive transistor in a floating state, and changes a potential of the gate electrode in the floating state via a parasitic capacitance and causes a current to flow via the n-channel drive transistor to increase a voltage between the other source/drain region and the gate electrode, and then applies the reference voltage to the gate electrode of the n-channel drive transistor,
• afterwards, performs write processing that applies a video signal voltage to the gate electrode of the n-channel drive transistor, and
• subsequently, sets the gate electrode of the n-channel drive transistor in the floating state to cause the light-emitting unit to emit light.