Patent ID: 8194009

Claim:
A light emitting device comprising: a pixel portion comprising a plurality of pixels at intersections of a signal line and a plurality of scan lines, each of the plurality of pixels comprising a light emitting element; a signal line driver circuit configured to output sequentially first to N-th bits of a first video signal, wherein N is an natural number greater than 1; a voltage-setting circuit configured to select a first voltage from a plurality of voltages in accordance with one of the first to N-th sub-frame periods, and to output the first voltage, wherein the first to N-th sub-frame periods correspond to the first to Nth bits of the first video signal, respectively, and wherein one frame period comprises the first to N-th sub-frame periods; a selection circuit comprising an inverter, in which the first video signal, the first voltage and a second voltage are inputted; wherein the selection circuit outputs the first voltage or the second voltage as a second video signal to one of the plurality of pixels through the signal line, wherein the second voltage has a constant level wherein values of the first voltages corresponding to the first to N-th sub-frame periods are different from each other, and wherein all of the first to N-th sub-frame periods have a same length.