Patent ID: 7961159

Claim:
A method of driving a light emitting device comprising: specifying m current source circuits among a plurality of current source circuits in accordance with a video signal, where m is a natural number equal to or larger than 1 in a setting period; supplying a first current to each of the m current source circuits; and converting the first current into a voltage in accordance with the video signal and supplying a second current corresponding to the voltage in each of the m current source circuits in a setting operation period, wherein the light emitting device comprises a pixel portion in which a plurality of scanning lines, a plurality of wirings, and a plurality of pixels are disposed in matrix; and a signal line driver circuit comprising the plurality of current source circuits respectively corresponding to the plurality of wirings, the plurality of pixels each comprising a light emitting element, a driving transistor, and a capacitor element for retaining a gate-source voltage of the driving transistor; wherein one frame period comprises a plurality of subframe periods; wherein each of the plurality of subframe periods comprises an address period and a lightening period; and wherein the setting period and the setting operation period are provided in a period during which the plurality of scanning lines are not selected in the lightening period.