The image display device includes: a plurality of pixels arranged in a matrix, each of which includes a driving transistor which converts a signal voltage which determines luminous intensity into a driving current; a luminescence element which generates photons according to the driving current flowing through it; and a threshold voltage detecting unit which detects a threshold voltage of the driving transistor while a reference voltage is applied. The pixels make up two or more driving blocks each of which includes a plurality of pixel rows. The image display device controls supply of the reference voltage and a power source voltage to all pixels in the same driving block with the same timing in a predetermined period and controls supply of the reference voltage and the power source voltage to all pixels in different blocks with different timings.