Patent ID: 7518393

Claim:
A pixel circuit board comprising: at least one pixel circuit; at least one scan line; at least one supply line; and at least one signal line which is connected to the pixel circuit and to which a current having a current value corresponding to a test voltage flows from the pixel circuit without intervening a display element; wherein the pixel circuit comprises: a write transistor which has a gate, a drain, and a source, the gate being connected to the scan line, and one of the drain and the source being connected to the signal line; a holding transistor which has a gate, a drain, and a source, the gate being connected to the scan line, and one of the drain and the source being connected to one of the supply line and the scan line; and a driving transistor which has a gate, a drain, and a source, the gate being connected to the other of the drain and the source of the holding transistor, one of the drain and the source of the driving transistor being connected to the supply line, and the other of the drain and the source of the driving transistor being connected to the other of the drain and the source of the write transistor.