The invention provides an organic LED display device of the digital drive
type which has a display panel comprising a plurality of pixels 51. Each
of the pixels 51 comprises an organic EL element 50, a drive transistor
TR2 for effecting or interrupting the passage of current through the EL
element 50 in response to the input of an on/off control signal, a write
transistor TR1 to be brought into conduction upon receiving scanning
voltage applied thereto from a scanning driver, a capacitance element C
to be supplied with data voltage from a data driver by the write
transistor TR1 conducting, and a comparator 9 for comparing a
predetermined ramp voltage with the output voltage of the capacitance
element C and supplying the result of comparison to the drive transistor
TR2 as the on/off control signal.