To provide a display device capable of allowing a light emitting element to emit light with a constant luminance while being free of an influence of deterioration over time and capable of accurate gradation display and high-speed writing of signal current to each pixel as well, in which an influence of noise causing leak current etc. is suppressed, and a driving method therefor. According to the present invention, plural pairs of switch portion and current source circuit are provided. Each of the plural switch portions is controlled in its switching operation according to a digital video signal. When the switch portion turns on, the current source circuit corresponding to the switch portion supplies current to allow the light emitting element to emit light. The current supplied from one current source circuit to the light emitting element is constant and a value of current flowing into the light emitting element corresponds to the total value of currents supplied to the respective light emitting elements from all the current source circuits corresponding to the switch portions in a conductive state.