Patent ID: 8339339

Claim:
A method of driving a light emitting device, said light emitting device including a plurality of pixels, each of the plurality of pixels comprising: n first memories (n is a natural number); n second memories; a display signal generating portion including n exclusive OR circuits, first NOR circuit, second NOR circuit, third NOR circuit and an inverter circuit, wherein each output of the n exclusive OR circuits is electrically connected to an input of the first NOR circuit, an output of the first NOR circuit is electrically connected to an input of the second NOR circuit, an output of the second NOR circuit is electrically connected to an input of the third NOR circuit and to an input of the inverter circuit, and an output of the third NOR circuit is electrically connected to an input of the second NOR circuit; a counter circuit; a light emitting element; and a current controlling thin film transistor, wherein an output of the inverter circuit is electrically connected to a gate electrode of the current controlling thin film transistor; said method comprising the steps of: sequentially writing each bit of n bit digital video signals in each of the n first memories; writing each bit of the n bit digital video signals, which have been written in each of the n first memories, in each of the n second memories at once; inputting each bit of the n bit digital video signals, which have been written in each of the n second memories, to each of the n exclusive OR circuits; starting an output of n counter signals from the counter circuit in response to a first reset signal, the n counter signals having different frequencies from each other; inputting each of the n counter signals to each of the n exclusive OR circuits; and inputting a display signal into the gate electrode of the current controlling thin film transistor in response to a second reset signal applied to an input of the third NOR circuit.