PROBLEM TO BE SOLVED: To provide a constant current output driver capable of suppressing increase in the period of a voltage acceleration test without damage to a transistor for current output.SOLUTION: A constant current output driver includes: a reference voltage generating circuit which generates a reference voltage and applies the generated reference voltage to a reference voltage line; a capacitor having one end connected to the reference voltage line and power supply potential being applied to the other end; a pull-down circuit which fixes the reference voltage line to ground potential according to a first test signal; a first transistor in which power supply potential is supplied to a source end and a pixel driving signal is supplied to a gate end; a current output transistor in which a source end is connected to a drain end of the first transistor and which outputs light emission driving current when the reference voltage is supplied to a gate end via the reference voltage line and an output driving l
