Patent ID: 8791939

Claim:
A display device including an active-matrix luminescence panel that includes pixels and data lines for determining luminescence of the pixels, comprising: a test current generator configured to supply a test current to one of the data lines; a voltage detector configured to detect the voltage of the one of the data lines; a controller configured to control a second switch, a fourth switch, the test current generator and the voltage detector, wherein each of the pixels includes: a driving transistor that has a gate, a source, and a drain, and converts a signal voltage supplied from one of the data lines into a signal current; a first switch between the one of the data lines and the gate of the driving transistor; a luminescence element that has an anode and a cathode, one of the anode and the cathode receiving the signal current from one of the source and the drain of the driving transistor, the luminescence element producing a luminescence according to the signal current; the second switch between the one of the data lines and a connection point between the one of the source and the drain of the driving transistor and the one of the anode and the cathode of the luminescence element; the fourth switch between the gate of the driving transistor and the one of the source and the drain of the driving transistor, and the controller is configured to: switch ON the second switch and the fourth switch, cause the test current generator to pass a first test current to the driving transistor, and cause the voltage detector to detect a first voltage corresponding to a voltage of the gate of the driving transistor generated by the first test current; and switch ON the second switch, cause the test current generator to pass a second test current to the luminescence element, and cause the voltage detector to detect a second voltage corresponding to a voltage of the one of the anode and the cathode of the luminescence element generated by the second test current.