EL display device and electronic device including the same
First Claim
1. An EL display device comprising:
- a monitor circuit comprising;
a monitor power supply line,a monitor transistor comprising a first terminal electrically connected to the monitor power supply line and a gate electrically connected to the monitor power supply line,a monitor light-emitting element comprising a first electrode electrically connected to a second terminal of the monitor transistor,a current source circuit electrically connected to a second electrode of the monitor light-emitting element, andan amplification circuit comprising an input terminal electrically connected to the second electrode of the monitor light-emitting element; and
a pixel comprising;
a light-emitting element comprising a first electrode electrically connected to an output terminal of the amplification circuit, anda driving transistor comprising a first terminal electrically connected to a second electrode of the light-emitting element, a second terminal electrically connected to a power supply line, and a gate electrically connected to a signal line,wherein each of the monitor transistor and the driving transistor comprises a semiconductor layer comprising an oxide semiconductor, andwherein a potential of the monitor power supply line is lower than a potential of the power supply line.
1 Assignment
0 Petitions
Accused Products
Abstract
An object is to suppress luminance variation due to change in the amount of current flowing through a light-emitting element, caused by change in environmental temperature. A monitor circuit for compensating the cathode potential of the light-emitting element in accordance with environmental temperature is provided in the vicinity of a pixel portion in order to compensate a change in properties, due to environmental temperature, of a transistor including an oxide semiconductor layer and the light-emitting element. The monitor circuit includes a monitor power supply line, a monitor transistor including an oxide semiconductor layer, a monitor light-emitting element, a current source circuit, and an amplification circuit that compensates the cathode potential of the light-emitting element. The potential of the monitor power supply line is lower than the potential of a power supply line in the pixel.
-
Citations
19 Claims
-
1. An EL display device comprising:
-
a monitor circuit comprising; a monitor power supply line, a monitor transistor comprising a first terminal electrically connected to the monitor power supply line and a gate electrically connected to the monitor power supply line, a monitor light-emitting element comprising a first electrode electrically connected to a second terminal of the monitor transistor, a current source circuit electrically connected to a second electrode of the monitor light-emitting element, and an amplification circuit comprising an input terminal electrically connected to the second electrode of the monitor light-emitting element; and a pixel comprising; a light-emitting element comprising a first electrode electrically connected to an output terminal of the amplification circuit, and a driving transistor comprising a first terminal electrically connected to a second electrode of the light-emitting element, a second terminal electrically connected to a power supply line, and a gate electrically connected to a signal line, wherein each of the monitor transistor and the driving transistor comprises a semiconductor layer comprising an oxide semiconductor, and wherein a potential of the monitor power supply line is lower than a potential of the power supply line. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An EL display device comprising:
-
a first monitor circuit comprising; a first monitor power supply line, a first monitor transistor comprising a first terminal electrically connected to the first monitor power supply line and a gate electrically connected to the first monitor power supply line, a first monitor light-emitting element comprising a first electrode electrically connected to a second terminal of the first monitor transistor, a first current source circuit electrically connected to a second electrode of the first monitor light-emitting element, and a first amplification circuit comprising an input terminal electrically connected to the second electrode of the first monitor light-emitting element; a second monitor circuit comprising; a second monitor power supply line, a second monitor transistor comprising a first terminal electrically connected to the second monitor power supply line and a gate electrically connected to the second monitor power supply line, a second monitor light-emitting element comprising a first electrode electrically connected to a second terminal of the second monitor transistor, a second current source circuit electrically connected to a second electrode of the second monitor light-emitting element, and a second amplification circuit comprising an input terminal electrically connected to the second electrode of the second monitor light-emitting element; a first pixel comprising; a first light-emitting element comprising a first electrode electrically connected to an output terminal of the first amplification circuit, and a first driving transistor comprising a first terminal electrically connected to a second electrode of the first light-emitting element, a second terminal electrically connected to a first power supply line, and a gate electrically connected to a first signal line; and a second pixel comprising; a second light-emitting element comprising a first electrode electrically connected to an output terminal of the second amplification circuit, and a second driving transistor comprising a first terminal electrically connected to a second electrode of the second light-emitting element, a second terminal electrically connected to a second power supply line, and a gate electrically connected to a second signal line, wherein each of the first monitor transistor, the second monitor transistor, the first driving transistor, and the second driving transistor comprises a semiconductor layer comprising an oxide semiconductor, wherein a potential of the first monitor power supply line is lower than a potential of the first power supply line, and wherein a potential of the second monitor power supply line is lower than a potential of the second power supply line. - View Dependent Claims (8, 9, 10, 11, 12, 13)
-
-
14. An EL display device comprising:
-
a monitor circuit comprising; a monitor power supply line, a monitor transistor comprising a first terminal electrically connected to the monitor power supply line and a gate electrically connected to the monitor power supply line, a monitor light-emitting element comprising a first electrode electrically connected to a second terminal of the monitor transistor, a current source circuit electrically connected to a second electrode of the monitor light-emitting element, and an amplification circuit comprising an input terminal electrically connected to the second electrode of the monitor light-emitting element; and a pixel comprising; a light-emitting element comprising a first electrode electrically connected to an output terminal of the amplification circuit, and a driving transistor comprising a first terminal electrically connected to a second electrode of the light-emitting element, a second terminal electrically connected to a power supply line, and a gate electrically connected to a signal line, wherein each of the monitor transistor and the driving transistor comprises a semiconductor layer comprising an oxide semiconductor, wherein a potential of the monitor power supply line is lower than a potential of the power supply line, wherein each of the monitor transistor and the driving transistor is formed over a first substrate, and wherein the amplification circuit is formed over a second substrate. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification