A display device comprising: a first light emitting element; a second light emitting element; a first transistor including a source terminal and a gate terminal; a second transistor including a source terminal, a gate terminal and a drain terminal; an amplifier circuit including an input terminal and an output terminal; a current source circuit; and a video signal generating circuit including an output terminal and an input terminal, wherein the gate terminal of the second transistor is electrically connected to the drain terminal of the second transistor, wherein the gate terminal of the first transistor is electrically connected to the output terminal of the video signal generating circuit, and wherein a second electrode of the first light emitting element is electrically connected to a second electrode of the second light emitting element, characterized in that the source terminal of the first transistor is electrically connected to a first electrode of the first light emitting element, the source terminal of the second transistor is electrically connected to a first electrode of the second light emitting element, the drain terminal of the second transistor is electrically connected to the input terminal of the amplifier circuit, the drain terminal and the source terminal of the second transistor are connected in series between the first electrode of the second light emitting element and the current source circuit, such that the drain is interposed between the source and the current source circuit, the drain terminal of the second transistor is electrically connected to the current source circuit, such that a sum of a voltage applied between the source and the drain of the second transistor and a voltage applied to the second light emitting element is inputted to the input terminal of the amplifier circuit, and the output terminal of the amplifier circuit is electrically connected to the input terminal of the video signal generating circuit, so that the voltage of a video signal is controlled by an output of the amplifier circuit to correct variations of the first light emitting element and the first transistor due to degradation and temperature change. a first light emitting element; a second light emitting element; a first transistor including a source terminal and a gate terminal; a second transistor including a source terminal, a gate terminal and a drain terminal; an amplifier circuit including an input terminal and an output terminal; a current source circuit; and a video signal generating circuit including an output terminal and an input terminal, wherein the gate terminal of the second transistor is electrically connected to the drain terminal of the second transistor, wherein the gate terminal of the first transistor is electrically connected to the output terminal of the video signal generating circuit, and wherein a second electrode of the first light emitting element is electrically connected to a second electrode of the second light emitting element, characterized in that the source terminal of the first transistor is electrically connected to a first electrode of the first light emitting element, the source terminal of the second transistor is electrically connected to a first electrode of the second light emitting element, the drain terminal of the second transistor is electrically connected to the input terminal of the amplifier circuit, the drain terminal and the source terminal of the second transistor are connected in series between the first electrode of the second light emitting element and the current source circuit, such that the drain is interposed between the source and the current source circuit, the drain terminal of the second transistor is electrically connected to the current source circuit, such that a sum of a voltage applied between the source and the drain of the second transistor and a voltage applied to the second light emitting element is inputted to the input terminal of the amplifier circuit, and the output terminal of the amplifier circuit is electrically connected to the input terminal of the video signal generating circuit, so that the voltage of a video signal is controlled by an output of the amplifier circuit to correct variations of the first light emitting element and the first transistor due to degradation and temperature change.