Patent ID: 8164546

Claim:
A method of driving a display device including data lines for determining luminescence of pixels and an active-matrix luminescence panel including pixels, each of the pixels including: 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; and a luminescence element that has an anode and a cathode, one of the anode and the cathode connected to and 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 method comprising: causing a first connection between a data driving circuit and the one of the data lines to be non-conductive and a second connection between a test current generator and the one of the data lines to be conductive, the data driving circuit supplying the signal voltage to the one of the data lines, the test current generator supplying a first test current to the driving transistor; flowing, from the test current generator via the one of the data lines, the first test current between the source and the drain of the driving transistor; detecting, with a voltage detection circuit that is connected to the one of the data lines, a first voltage corresponding to a gate voltage of the driving transistor generated by the first test current; causing the first connection between the data driving circuit and the one of the data lines to be non-conductive and the second connection between the test current generator and the one of the data lines to be conductive, the test current generator supplying a second test current to the luminescence element; flowing, from the test current generator via the one of the data lines, the second test current to the luminescence element; and detecting, with the voltage detection circuit that is connected to the one of the data lines, a second voltage corresponding to a luminescence voltage of the one of the anode and the cathode of the luminescence element generated by the second test current.