Image display device, drive circuit device and defect detection method of light-emitting diode

A drive circuit device for driving a predetermined number of light-emitting diodes, comprising

• a voltage detection portion for applying a constant current to said predetermined number of light-emitting diodes in an off region at a forward voltage or less in accordance with an input of a signal indicating a defect detection mode, and outputting data on voltages between terminals for electrically detecting a defect from said plurality of light-emitting diodes from a difference of voltages between terminals of light-emitting diodes arising when the constant current flows there through, wherein said voltage detection portion comprises
• a current source connected in series with said light-emitting diodes;
• and
• a predetermined number of comparators for comparing a voltage of one terminal of a light emitting diode changing in proportional to said voltages between terminals as a result that said constant current flows in said current source with an input reference voltage, and further comprising:
• a logic calculation unit for executing logic calculation on outputs of said predetermined number of comparators and outputting a result of the logic calculation as binary data indicating an existence of a particularity with a probability of being said defect;
• and
• a transfer register for adding said binary data output from said logic calculation unit to data to be input and outputting.