Patent ID: 8890778

Claim:
A display device, comprising: a luminescence element including a first electrode and a second electrode; a first power line electrically connected to the first electrode; a second power line electrically connected to the second electrode; a capacitor including a third electrode and a fourth electrode, the capacitor holding a voltage; a driving transistor between the first electrode and the first power line that passes a current between the first power line and the second power line, the current corresponding to the voltage held by the capacitor; a data line through which a signal voltage is supplied to one of the third electrode and the fourth electrode; a data-line driver that supplies the signal voltage to the data line; a first switch between the data line and the one of the third electrode and the fourth electrode for switchedly supplying the capacitor with the signal voltage; a voltage detector connected to the data line for detecting an electric potential at a connection point between the luminescence element and the driving transistor; a second switch between the data line and the first electrode; a controller that causes the capacitor to hold the voltage corresponding to the signal voltage supplied through the data line by switching on the first switch, the driving transistor to pass, between the first power line and the second power line, a current corresponding to the voltage held by the capacitor, and the voltage detector to detect the electric potential at the connection point via the data line by switching off the first switch, switching on the second switch, and putting the data-line driver in a high impedance state; and a determiner that determines a drain current of the driving transistor based on the electric potential detected by the voltage detector, wherein the controller causes the voltage detector to detect the electric potential at the connection point via the data line using the voltage corresponding to the signal voltage supplied through the data line and not using a special voltage input from the data-line driver.