Patent ID: 6930505

Claim:
An inspection method for an EL array substrate having a drive transistor with a drain connected to one of electrodes of an EL element, a holding capacitor connected to a gate of said drive transistor, a parasitic capacitor formed between said one of electrodes of the EL element and the gate of said drive transistor, and a switching transistor with a source connected to the gate of said drive transistor, said method comprising: a writing step of giving a prescribed potential to a drain of said switching transistor, and turning on said switching transistor for a prescribed write time; a reading step of, after a lapse of a prescribed time from turning-off of said switching transistor, turning on again said switching transistor, and connecting the drain of said switching transistor to a charge amount measuring device; and a detection step of detecting a failure on said EL array substrate based on an output of said charge amount measuring device.