Patent ID: 8605076

Claim:
A light-emitting device comprising: a pixel portion comprising at least a first light-emitting element and a second light-emitting element, wherein the first light-emitting element comprises a first anode and the second light-emitting element comprises a second anode; an operational amplifier; a first resistor; and a buffer, wherein a first input terminal of the operational amplifier is electrically connected to one terminal of the first resistor, wherein a second input terminal of the operational amplifier is electrically connected to the first anode and a terminal of the buffer to which a high power potential is configured to be supplied; wherein an output terminal of the operational amplifier is electrically connected to the other terminal of the first resistor and a terminal of the buffer to which a low power potential is configured to be supplied, wherein the first light-emitting element and the second light-emitting element include different emission colors, and wherein a potential of the first anode is different from a potential of the second anode.