Patent ID: 9735282
Date: 2017-08-15
CPC Classifications: G09G,H01L,H05B

Claim:
1. A semiconductor device comprising: a pixel portion; and a monitor circuit provided outside the pixel portion, wherein the pixel portion comprises a first light-emitting element, wherein the monitor circuit comprises a second light-emitting element, a transistor, a resistor, and an amplifier circuit, wherein an anode of the second light-emitting element is electrically connected to one of a source and a drain of the transistor, wherein a cathode of the second light-emitting element is electrically connected to one electrode of the resistor and a first input terminal of the amplifier circuit, wherein the other electrode of the resistor is electrically connected to a first power supply line, wherein a second input terminal of the amplifier circuit is electrically connected to a second power supply line, wherein an output terminal of the amplifier circuit is electrically connected to a gate of the transistor, wherein the other of the source and the drain of the transistor is electrically connected to a third power supply line, wherein the transistor includes an oxide semiconductor film formed on a surface, wherein the resistor includes an oxide conductive film formed on the same surface as the oxide semiconductor film, and wherein an amount of current flowing through the first light-emitting element is controlled by the monitor circuit.