Pixel circuit
A pixel circuit including an organic light-emitting element, a switching transistor, a storage capacitor that stores a data signal applied via a data line, a driving transistor that allows a driving current corresponding to the data signal to flow into the organic light-emitting element, an emission control transistor electrically connected to the organic light-emitting element and the driving transistor in series, and sync transistors electrically connected to a bottom metal electrode of the driving transistor. The sync transistors include a first sync transistor electrically connected to a first one selected from a source electrode of the driving transistor, a gate electrode of the driving transistor, the high power voltage, and the low power voltage and a second sync transistor electrically connected to a second one selected from the source electrode of the driving transistor, the gate electrode of the driving transistor, the high power voltage, and the low power voltage.
1. A pixel circuit, comprising:
an organic light-emitting element;
a switching transistor configured to be turned on or off in response to a scan signal;
a storage capacitor configured to store a data signal applied via a data line when the switching transistor is turned on in response to the scan signal;
a driving transistor configured to allow a driving current corresponding to the data signal stored in the storage capacitor to flow into the organic light-emitting element;
an emission control transistor electrically connected to the organic light-emitting element and the driving transistor in series between a high power voltage and a low power voltage and configured to be turned on or off in response to an emission control signal; and
a plurality of sync transistors directly connected to a bottom metal electrode of the driving transistor,
wherein:
the sync transistors comprise:
a first sync transistor including a first electrode directly connected to a source electrode of the driving transistor, a second electrode directly connected to the bottom metal electrode of the driving transistor, and a gate electrode to which a first sync control signal is applied; and
a second sync transistor including a first electrode directly connected to a gate electrode of the driving transistor, a second electrode directly connected to the bottom metal electrode of the driving transistor, and a gate electrode to which a second sync control signal that is different from the first sync control signal is applied.
2. The pixel circuit of claim 1 , wherein:
the second sync transistor is turned off when the first sync transistor is turned on; and
the first sync transistor is turned off when the second sync transistor is turned on.
3. The pixel circuit of claim 1 , wherein:
the first sync transistor is a source sync transistor directly connected between the source electrode of the driving transistor and the bottom metal electrode of the driving transistor and configured to be turned on or off in response to the first sync control signal; and
the second sync transistor is a gate sync transistor directly connected between the gate electrode of the driving transistor and the bottom metal electrode of the driving transistor and configured to be turned on or off in response to the second sync control signal.
4. The pixel circuit of claim 3 , wherein:
the driving transistor is a p-channel metal oxide semiconductor transistor; and
a threshold voltage of the driving transistor is shifted in a negative direction when the source sync transistor is turned on in response to the first sync control signal.
5. The pixel circuit of claim 3 , wherein:
the driving transistor is a p-channel metal oxide semiconductor transistor; and
a threshold voltage of the driving transistor is shifted in a positive direction when the gate sync transistor is turned on in response to the second sync control signal.
6. A pixel circuit, comprising:
an organic light-emitting element;
a switching transistor configured to be turned on or off in response to a scan signal;
a storage capacitor configured to store a data signal applied via a data line when the switching transistor is turned on in response to the scan signal;
a driving transistor configured to allow a driving current corresponding to the data signal stored in the storage capacitor to flow into the organic light-emitting element;
an emission control transistor electrically connected to the organic light-emitting element and the driving transistor in series between a high power voltage and a low power voltage and configured to be turned on or off in response to an emission control signal;
a source sync transistor electrically connected between a source electrode of the driving transistor and a bottom metal electrode of the driving transistor and configured to be turned on or off in response to a source sync control signal; and
a gate sync transistor electrically connected between a gate electrode of the driving transistor and the bottom metal electrode of the driving transistor and configured to be turned on or off in response to a gate sync control signal, wherein:
the driving transistor is a p-channel metal oxide semiconductor transistor;
a threshold voltage of the driving transistor is shifted in a negative direction when the source sync transistor is turned on in response to the source sync control signal;
the source sync control signal is activated during a first period when a decrease of the driving current flowing into the organic light-emitting element is required; and
the source sync transistor is turned on during the first period to allow a source voltage of the source electrode of the driving transistor to be applied to the bottom metal electrode of the driving transistor.
7. A pixel circuit, comprising:
an organic light-emitting element;
a switching transistor configured to be turned on or off in response to a scan signal;
a storage capacitor configured to store a data signal applied via a data line when the switching transistor is turned on in response to the scan signal;
a driving transistor configured to allow a driving current corresponding to the data signal stored in the storage capacitor to flow into the organic light-emitting element;
an emission control transistor electrically connected to the organic light-emitting element and the driving transistor in series between a high power voltage and a low power voltage and configured to be turned on or off in response to an emission control signal;
a source sync transistor electrically connected between a source electrode of the driving transistor and a bottom metal electrode of the driving transistor and configured to be turned on or off in response to a source sync control signal; and
a gate sync transistor electrically connected between a gate electrode of the driving transistor and the bottom metal electrode of the driving transistor and configured to be turned on or off in response to a gate sync control signal, wherein:
the driving transistor is a p-channel metal oxide semiconductor transistor;
a threshold voltage of the driving transistor is shifted in a positive direction when the gate sync transistor is turned on in response to the gate sync control signal;
the gate sync control signal is activated during a second period when an increase of the driving current flowing into the organic light-emitting element is required; and
the gate sync transistor is turned on during the second period to allow a gate voltage of the gate electrode of the driving transistor to be applied to the bottom metal electrode of the driving transistor.