Drive circuit, display device, and drive method
A drive circuit for a light emitting element which can correct a threshold voltage of a drive transistor between two reference voltages without a reset power supply. The drive circuit includes a light emitting element, a drive transistor for controlling an amount of current, a first switching element that is arranged between the light emitting element and the drive transistor, a second switching element that is arranged between the drive transistor and the second reference voltage, a third switching element that is arranged between a gate, and one of a source and a drain of the drive transistor, a fourth switching element that is connected to the other of the source and the drain of the drive transistor, and controls input of signal voltage, and a first capacitor connected to the gate of the drive transistor.
1. A display device having a plurality of pixels arrayed in a matrix, each of the plurality of pixels comprising:
a first line connected to a first reference voltage;
a second line connected to a second reference voltage higher than the first reference voltage;
a light emitting element between the first line and the second line, and emits a light by allowing a current to flow therein;
a drive transistor between the light emitting element and the second line, for controlling the amount of current flowing into the light emitting element;
a first switching element between the light emitting element and the drive transistor;
a second switching element between the drive transistor and the second line;
a third switching element between a gate of the drive transistor, and one of a source and a drain of the drive transistor;
a fourth switching element electrically connected to an other of the source and the drain of the drive transistor, for controlling an input of a signal voltage;
a first capacitor having one end electrically connected to the gate of the drive transistor; and
a second capacitor having one end electrically connected to the gate of the drive transistor.
2. The display device according to claim 1 , wherein
the first capacitor has an other end electrically connected to a constant voltage.
3. The display device according to claim 2 , wherein
the other end of the first capacitor is electrically connected to the second reference voltage.
4. The display device according to claim 1 , wherein
the second capacitor has an other end electrically connected to a terminal on the first line side out of the source and the drain of the drive transistor.
5. The display device according to claim 1 , wherein
the third switching element comprises a transistor having a multi-gate structure.
6. The display device according to claim 1 , wherein
the fourth switching element comprises a transistor having a multi-gate structure.
7. A drive circuit, comprising:
a first line connected to a first reference voltage;
a second line connected to a second reference voltage higher than the first reference voltage;
a light emitting element between the first line and the second line, and emits a light by allowing a current to flow therein;
a drive transistor between the light emitting element and the second line, for controlling the amount of current flowing into the light emitting element;
a first switching element between the light emitting element and the drive transistor;
a second switching element between the drive transistor and the second line;
a third switching element between a gate of the drive transistor, and one of a source and a drain of the drive transistor;
a fourth switching element electrically connected to an other of the source and the drain of the drive transistor, for controlling an input of a signal voltage;
a first capacitor having one end electrically connected to the gate of the drive transistor; and
a second capacitor having one end electrically connected to the gate of the drive transistor.
8. The drive circuit according to claim 7 , wherein
the first capacitor has an other end electrically connected to a constant voltage.
9. The drive circuit according to claim 8 , wherein
the other end of the first capacitor is electrically connected to the second reference voltage.
10. The drive circuit according to claim 7 , wherein
the second capacitor has an other end electrically connected to a terminal on the first line side out of the source and the drain of the drive transistor.
11. The drive circuit according to claim 7 , wherein
the third switching element comprises a transistor having a multi-gate structure.
12. The drive circuit according to claim 7 , wherein
the fourth switching element comprises a transistor having a multi-gate structure.