Pixel circuit, driving method, and display device
Provided are a pixel circuit, a driving method, and a display device. The pixel circuit includes a light-emitting element, drive circuit, control circuit, first initialization circuit, first light-emitting control circuit and second light-emitting control circuit, wherein the control circuit causes a control terminal of the drive circuit to be electrically connected to a connection node under the control of a first scanning signal; the first initialization circuit writes a first initial voltage to the connection node under the control of a reset control signal; the first light-emitting control circuit causes a first voltage terminal to be conductively connected to a first terminal of the drive circuit under the control of a first light-emitting control signal; the second light-emitting control circuit causes a second terminal of the drive circuit to be conductively connected to a first electrode of the light-emitting element under control of a second light-emitting control signal.
1. A pixel circuit, comprising: a light-emitting element, a drive circuit, a control circuit, a first initialization circuit, a first light-emitting control circuit and a second light-emitting control circuit, wherein
the control circuit is electrically connected to a first scanning line, a control terminal of the drive circuit and a connection node, and is used for causing, under the control of a first scanning signal provided by the first scanning line, the control terminal of the drive circuit to be electrically connected to the connection node;
the first initialization circuit is electrically connected to a reset control line, the connection node and a first initial voltage line, and is used for writing, under the control of a reset control signal provided by the reset control line, a first initial voltage provided by the first initial voltage line to the connection node;
the first light-emitting control circuit is electrically connected to a first light-emitting control line, a first voltage terminal and a first terminal of the drive circuit, and is used for causing, under the control of a first light-emitting control signal provided by the first light-emitting control line, the first voltage terminal to be conductively connected to the first terminal of the drive circuit;
the second light-emitting control circuit is electrically connected to a second light-emitting control line, a second terminal of the drive circuit and a first electrode of the light-emitting element, and is used for causing, under the control of a second light-emitting control signal provided by the second light-emitting control line, the second terminal of the drive circuit to be conductively connected to the first electrode of the light-emitting element;
the drive circuit is used for causing, under the control of a potential at the control terminal of the drive circuit, the first terminal of the drive circuit to be conductively connected to the second terminal of the drive circuit;
wherein the pixel circuit further comprises a reset circuit;
wherein the reset circuit is electrically connected to the reset control line and the first terminal of the drive circuit, and is used for initializing a potential of the first terminal of the drive circuit under the control of the reset control signal; or,
the reset circuit is electrically connected to the reset control line and the second terminal of the drive circuit, and is used for initializing a potential of the second terminal of the drive circuit under the control of the reset control signal;
wherein the reset circuit comprises a first transistor;
a control electrode of the first transistor and a first electrode of the first transistor are electrically connected to the reset control line, and a second electrode of the first transistor is electrically connected to the first terminal of the drive circuit or the second terminal of the drive circuit.
2. The pixel circuit according to claim 1 , wherein the first light-emitting control circuit comprises a second transistor, and the second light-emitting control circuit comprises a third transistor;
a control electrode of the second transistor is electrically connected to the first light-emitting control line, a first electrode of the second transistor is electrically connected to the first voltage terminal, and a second electrode of the second transistor is electrically connected to the first terminal of the drive circuit;
a control electrode of the third transistor is electrically connected to the second light-emitting control line, a first electrode of the third transistor is electrically connected to the second terminal of the drive circuit, and a second electrode of the third transistor is electrically connected to the first electrode of the light-emitting element.
3. The pixel circuit according to claim 1 , wherein the first light-emitting control line and the second light-emitting control line are different light-emitting control lines; or,
the first light-emitting control line and the second light-emitting control line are the same light-emitting control line.
4. The pixel circuit according to claim 1 , wherein the control circuit comprises a fourth transistor;
a control electrode of the fourth transistor is electrically connected to the first scanning line, a first electrode of the fourth transistor is electrically connected to the control terminal of the drive circuit, and a second electrode of the fourth transistor is electrically connected to the connection node;
the fourth transistor is an oxide thin-film transistor.
5. The pixel circuit according to claim 1 , further comprising a second initialization circuit; wherein
the second initialization circuit is electrically connected to an initial control line, a second initial voltage line and the first electrode of the light-emitting element, and is used for writing, under the control of an initial control signal provided by the initial control line, a second initial voltage provided by the second initial voltage line to the first electrode of the light-emitting element.
6. The pixel circuit according to claim 5 , wherein the second initialization circuit comprises a fifth transistor;
a control electrode of the fifth transistor is electrically connected to the initial control line, a first electrode of the fifth transistor is electrically connected to the second initial voltage line, and a second electrode of the fifth transistor is electrically connected to the first electrode of the light-emitting element;
the fifth transistor is an oxide thin-film transistor; the initial control line is the first light-emitting control line or the second light-emitting control line.
7. The pixel circuit according to claim 1 , further comprising a compensation control circuit, a data writing circuit and an energy storage circuit; wherein
the compensation control circuit is electrically connected to a second scanning line, the connection node and the second terminal of the drive circuit, and is used for causing, under the control of a second scanning signal provided by the second scanning line, the connection node to be conductively connected to the second terminal of the drive circuit;
the data writing circuit is electrically connected to the second scanning line, a data line and the first terminal of the drive circuit, and is used for writing, under the control of the second scanning signal, a data voltage on the data line to the first terminal of the drive circuit;
the energy storage circuit is electrically connected to the control terminal of the drive circuit, and is used for storing electric energy.
8. The pixel circuit according to claim 7 , wherein the first initialization circuit comprises a sixth transistor, the compensation control circuit comprises a seventh transistor, the data writing circuit comprises an eighth transistor, the drive circuit comprises a drive transistor, and the energy storage circuit comprises a storage capacitor;
a control electrode of the sixth transistor is electrically connected to the reset control line, a first electrode of the sixth transistor is electrically connected to the first initial voltage line, and a second electrode of the sixth transistor is electrically connected to the connection node;
a control electrode of the seventh transistor is electrically connected to the second scanning line, a first electrode of the seventh transistor is electrically connected to the connection node, and a second electrode of the seventh transistor is electrically connected to a second electrode of the drive transistor;
a control electrode of the eighth transistor is electrically connected to the second scanning line, a first electrode of the eighth transistor is electrically connected to the data line, and a second electrode of the eighth transistor is electrically connected to a first electrode of the drive transistor;
a first terminal of the storage capacitor is electrically connected to a control electrode of the drive transistor, and a second terminal of the storage capacitor is electrically connected to the first voltage terminal.
9. A driving method applied to a pixel circuit, wherein the pixel circuit comprises: a light-emitting element, a drive circuit, a control circuit, a first initialization circuit, a first light-emitting control circuit and a second light-emitting control circuit, wherein
the control circuit is electrically connected to a first scanning line, a control terminal of the drive circuit and a connection node, and is used for causing, under the control of a first scanning signal provided by the first scanning line, the control terminal of the drive circuit to be electrically connected to the connection node;
the first initialization circuit is electrically connected to a reset control line, the connection node and a first initial voltage line, and is used for writing, under the control of a reset control signal provided by the reset control line, a first initial voltage provided by the first initial voltage line to the connection node;
the first light-emitting control circuit is electrically connected to a first light-emitting control line, a first voltage terminal and a first terminal of the drive circuit, and is used for causing, under the control of a first light-emitting control signal provided by the first light-emitting control line, the first voltage terminal to be conductively connected to the first terminal of the drive circuit;
the second light-emitting control circuit is electrically connected to a second light-emitting control line, a second terminal of the drive circuit and a first electrode of the light-emitting element, and is used for causing, under the control of a second light-emitting control signal provided by the second light-emitting control line, the second terminal of the drive circuit to be conductively connected to the first electrode of the light-emitting element;
the drive circuit is used for causing, under the control of a potential at the control terminal of the drive circuit, the first terminal of the drive circuit to be conductively connected to the second terminal of the drive circuit;
wherein the pixel circuit further comprises a reset circuit;
wherein the reset circuit is electrically connected to the reset control line and the first terminal of the drive circuit, and is used for initializing a potential of the first terminal of the drive circuit under the control of the reset control signal; or,
the reset circuit is electrically connected to the reset control line and the second terminal of the drive circuit, and is used for initializing a potential of the second terminal of the drive circuit under the control of the reset control signal;
wherein the reset circuit comprises a first transistor;
a control electrode of the first transistor and a first electrode of the first transistor are electrically connected to the reset control line, and a second electrode of the first transistor is electrically connected to the first terminal of the drive circuit or the second terminal of the drive circuit;
wherein a display cycle comprises an initialization phase; the driving method comprises:
in the initialization phase, writing, by the first initialization circuit under the control of the reset control signal, the first initial voltage to the connection node, and causing, by the control circuit under the control of the first scanning signal, the control terminal of the drive circuit to be electrically connected to the connection node, so as to write the first initial voltage to the control terminal of the drive circuit and cause the drive transistor in the drive circuit to be in a predetermined bias state at the end of the initialization phase.
10. The driving method according to claim 9 , wherein the predetermined bias state is an off-bias state; the driving method further comprises:
in the initialization phase, causing, by the second light-emitting control circuit under the control of the second light-emitting control signal, the second terminal of the drive circuit to be conductively connected to the first electrode of the light-emitting element;
at the start of the initialization phase, causing, by the drive circuit under the control of a potential at the control terminal of the drive circuit, the first terminal of the drive circuit to be conductively connected to the second terminal of the drive circuit, to vary a potential at the first terminal of the drive circuit until the drive transistor comprised in the drive circuit turns off, and the drive transistor is in an off-bias state.
11. The driving method according to claim 9 , wherein the predetermined bias state is an on-bias state; the driving method further comprises:
in the initialization phase, causing, by the first light-emitting control circuit under the control of the first light-emitting control signal, the first terminal of the drive circuit to be conductively connected to the first voltage terminal, such that the drive transistor in the drive circuit is in an on-bias state.
12. The driving method according to claim 10 , wherein the pixel circuit further comprises a data writing circuit, and the display cycle further comprises a data writing phase following the initialization phase; the driving method further comprises:
in the data writing phase, writing, by the data writing circuit under the control of a second scanning line, a data voltage on a data line to the first terminal of the drive circuit.
13. The driving method according to claim 10 , wherein the pixel circuit further comprises a second initialization circuit; the driving method further comprises:
writing, by the second initialization circuit under the control of an initial control signal, a second initial voltage to the first electrode of the light-emitting element to control the light-emitting element not to emit light.
14. A driving method applied to a pixel circuit, wherein the pixel circuit comprises: a light-emitting element, a drive circuit, a control circuit, a first initialization circuit, a first light-emitting control circuit and a second light-emitting control circuit, wherein
the control circuit is electrically connected to a first scanning line, a control terminal of the drive circuit and a connection node, and is used for causing, under the control of a first scanning signal provided by the first scanning line, the control terminal of the drive circuit to be electrically connected to the connection node;
the first initialization circuit is electrically connected to a reset control line, the connection node and a first initial voltage line, and is used for writing, under the control of a reset control signal provided by the reset control line, a first initial voltage provided by the first initial voltage line to the connection node;
the first light-emitting control circuit is electrically connected to a first light-emitting control line, a first voltage terminal and a first terminal of the drive circuit, and is used for causing, under the control of a first light-emitting control signal provided by the first light-emitting control line, the first voltage terminal to be conductively connected to the first terminal of the drive circuit;
the second light-emitting control circuit is electrically connected to a second light-emitting control line, a second terminal of the drive circuit and a first electrode of the light-emitting element, and is used for causing, under the control of a second light-emitting control signal provided by the second light-emitting control line, the second terminal of the drive circuit to be conductively connected to the first electrode of the light-emitting element;
the drive circuit is used for causing, under the control of a potential at the control terminal of the drive circuit, the first terminal of the drive circuit to be conductively connected to the second terminal of the drive circuit;
wherein the pixel circuit further comprises a reset circuit;
wherein the reset circuit is electrically connected to the reset control line and the first terminal of the drive circuit, and is used for initializing a potential of the first terminal of the drive circuit under the control of the reset control signal; or,
the reset circuit is electrically connected to the reset control line and the second terminal of the drive circuit, and is used for initializing a potential of the second terminal of the drive circuit under the control of the reset control signal;
wherein the reset circuit comprises a first transistor;
a control electrode of the first transistor and a first electrode of the first transistor are electrically connected to the reset control line, and a second electrode of the first transistor is electrically connected to the first terminal of the drive circuit or the second terminal of the drive circuit;
wherein the first light-emitting control line and the second light-emitting control line are the same light-emitting control line; the display cycle comprises an initialization phase;
the driving method comprises:
in the initialization phase, writing, by the first initialization circuit under the control of the reset control signal, the first initial voltage to the connection node, and causing, by the control circuit under the control of the first scanning signal, the control terminal of the drive circuit to be electrically connected to the connection node so as to write the first initial voltage to the control terminal of the drive circuit; and initializing, by the reset circuit under the control of the reset control signal, the potential of the first terminal of the drive circuit or the potential of the second terminal of the drive circuit.
15. The driving method according to claim 14 , wherein the pixel circuit further comprises a data writing circuit, and the display cycle further comprises a data writing phase following the initialization phase; the driving method further comprises:
in the data writing phase, writing, by the data writing circuit under the control of a second scanning line, a data voltage on a data line to the first terminal of the drive circuit.
16. The driving method according to claim 14 , wherein the pixel circuit further comprises a second initialization circuit; the driving method further comprises:
writing, by the second initialization circuit under the control of an initial control signal, a second initial voltage to the first electrode of the light-emitting element to control the light-emitting element not to emit light.
17. A display device comprising the pixel circuit according to claim 1 .