this disclosure concerns a display device including : scanning lines ; data lines ; a drive transistor controlling a current through a light emitting element ; a bias transistor connected between a gate of the drive transistor and a first signal line transmitting a negative bias lower than a potential of the second power supply ; a vt detection transistor setting a threshold voltage of the drive transistor ; a capacitor applying a potential difference between gate - source of the drive transistor ; a scanning transistor setting a potential of the data line to the second electrode ; a scanning line driver ; and a data line driver transmitting potential data to the pixel columns , wherein before setting the threshold voltage to the first electrode , the bias transistor connects the first signal line to the gate of the drive transistor and applies the negative bias to the gate of the drive transistor .