Patent ID: 7795618

Claim:
A method of driving a light emitting device comprising: keeping a first drain current that flows from a first source to a first drain of a first transistor provided in a pixel to be a magnitude corresponding to a voltage of a video signal via a fourth transistor connected with the first drain of the first transistor in series during a write period; keeping a second drain current that flows from a second source to a second drain of a second transistor provided in the pixel to be proportional to the first drain current with a second gate voltage of the second transistor equal to a first gate voltage of the first transistor during the write period; keeping the second gate voltage of the second transistor during the write period and a display period subsequent to the write period to emit a light by supplying a light emitting element with the second drain current via a third transistor connected with the second drain of the second transistor in series; and impressing an inversed bias voltage of a power supply line to the light emitting element via the second transistor and the third transistor.