Pixel circuit, pixel driving method, display substrate, and display device

1 . A pixel circuit, comprising: a driving circuit, a first reset circuit, a first node control circuit, a first light-emitting control circuit and a light-emitting element;

wherein a control end of the driving circuit is electrically connected to a first node;

the first reset circuit is directly electrically connected to the first node and the driving circuit, and is electrically connected to a first initial voltage line and a first electrode of the light-emitting element, and is configured to write a first initial voltage provided by the first initial voltage line into the first electrode of the light-emitting element under control of a potential of the first node, to initialize the first electrode of the light-emitting element;

the first node control circuit is electrically connected to a data line, the first node, a first end of the driving circuit and a second end of the driving circuit, and is configured to control the potential of the first node according to a data voltage provided by the data line and a threshold voltage of a driving transistor included in the driving circuit;

the first light-emitting control circuit is electrically connected to a light-emitting control line, a second end of the driving circuit and the first electrode of the light-emitting element, and is configured to control connection between the second end of the driving circuit and the first electrode of the light-emitting element under control of a light-emitting control signal provided by the light-emitting control line;

the driving circuit is configured to generate a driving current under control of the potential of the first node; and

a second electrode of the light-emitting element is electrically connected to the first voltage line.

2 . The pixel circuit according to claim 1 , wherein the first node control circuit comprises a data writing circuit, a compensation control circuit and a tank circuit;

the data writing circuit is electrically connected to a scanning line, the data line and the first end of the driving circuit, and is configured to write a data voltage provided by the data line into the first end of the driving circuit under control of a scanning signal provided by the scanning line;

the compensation control circuit is electrically connected to the scanning line, the control end of the driving circuit and the second end of the driving circuit, and is configured to control connection between the control end of the driving circuit and the second end of the driving circuit under control of the scanning signal; and

a first end of the tank circuit is electrically connected to the control end of the driving circuit, a second end of the tank circuit is electrically connected to a second voltage line, and the tank circuit is configured to store electric energy.

3 . The pixel circuit according to claim 2 , wherein the data writing circuit comprises a third transistor, and the compensation control circuit comprises a fourth transistor; the tank circuit comprises a first capacitor;

a control electrode of the third transistor is electrically connected to the scanning line, a first electrode of the third transistor is electrically connected to the data line, and a second electrode of the third transistor is electrically connected to the first end of the driving circuit;

a control electrode of the fourth transistor is electrically connected to the scanning line, a first electrode of the fourth transistor is electrically connected to the control end of the driving circuit, and a second electrode of the fourth transistor is electrically connected to the second end of the driving circuit; and

a first plate of the first capacitor is electrically connected to the control end of the driving circuit, and a second plate of the first capacitor is electrically connected to the second voltage line.

4 . The pixel circuit according to claim 1 , further comprising a second reset circuit, wherein

the second reset circuit is electrically connected to a reset control line, a second initial voltage line and a control end of the driving circuit, and is configured to provide a second initial voltage provided by the second initial voltage line to the control end of the driving circuit under control of a reset control signal provided by the reset control line.

5 . The pixel circuit according to claim 4 , wherein the second reset circuit comprises a fifth transistor; and

a control electrode of the fifth transistor is electrically connected to the reset 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 a control end of the driving circuit.

6 . The pixel circuit according to claim 1 , further comprising a second light-emitting control circuit;

the second light-emitting control circuit is electrically connected to the light-emitting control line, the second voltage line and the first end of the driving circuit, and is configured to control connection between the first end of the driving circuit and the second voltage line under control of a light-emitting control signal provided by the light-emitting control line;

the second light-emitting control circuit comprises a sixth transistor; and

a control electrode of the sixth transistor is electrically connected to the light-emitting control line, a first electrode of the sixth transistor is electrically connected to the second voltage line, and a second electrode of the sixth transistor is electrically connected to the first end of the driving circuit.

7 . The pixel circuit according to claim 1 , wherein the first reset circuit comprises a first transistor; and

a control electrode of the first transistor is electrically connected to the first node, a first electrode of the first transistor is electrically connected to the first initial voltage line, and a second electrode of the first transistor is electrically connected to the first electrode of the light-emitting element.

8 . The pixel circuit according to claim 1 , wherein the driving circuit comprises a driving transistor, and the first light-emitting control circuit comprises a second transistor;

a control electrode of the driving transistor is electrically connected to the first node, a first electrode of the driving transistor is electrically connected to the first end of the driving circuit, and a second electrode of the driving transistor is electrically connected to the second end of the driving circuit; and

a control electrode of the second transistor is electrically connected to the light-emitting control line, a first electrode of the second transistor is electrically connected to the second end of the driving circuit, and a second electrode of the second transistor is electrically connected to the first electrode of the light-emitting element.

9 . A display device comprising a display substrate as claimed in claim 1 .

10 . A pixel driving method, applied to a pixel circuit wherein the pixel circuit comprises:

a driving circuit, a first reset circuit, a first node control circuit, a first light-emitting control circuit and a light-emitting element;

wherein a control end of the driving circuit is electrically connected to a first node:

the first reset circuit is directly electrically connected to the first node and the driving circuit, and is electrically connected to a first initial voltage line and a first electrode of the light-emitting element, and is configured to write a first initial voltage provided by the first initial voltage line into the first electrode of the light-emitting element under control of a potential of the first node, to initialize the first electrode of the light-emitting element;

the first node control circuit is electrically connected to a data line, the first node, a first end of the driving circuit and a second end of the driving circuit, and is configured to control the potential of the first node according to a data voltage provided by the data line and a threshold voltage of a driving transistor included in the driving circuit:

the first light-emitting control circuit is electrically connected to a light-emitting control line, a second end of the driving circuit and the first electrode of the light-emitting element and is configured to control connection between the second end of the driving circuit and the first electrode of the light-emitting element under control of a light-emitting control signal provided by the light-emitting control line;

the driving circuit is configured to generate a driving current under control of the potential of the first node; and

a second electrode of the light-emitting element is electrically connected to the first voltage line;

wherein a display cycle comprises a data writing stage and a display stage which are arranged successively; the pixel driving method comprises:

in the data writing stage, the data line provides a data voltage, and the first node control circuit controls the potential of the first node according to the data voltage and the threshold voltage of the driving transistor in the driving circuit; and

in the display stage, when the data voltage is a data voltage corresponding to a black picture, the first reset circuit writes a first initial voltage to the first electrode of the light-emitting element under control of the potential of the first node to initialize the first electrode of the light-emitting element.

11 . The pixel driving method according to claim 10 , wherein the pixel driving method further comprises: when the data voltage is not a data voltage corresponding to a black picture, in the display stage, the first light-emitting control circuit controls connection between the second end of the driving circuit and the first electrode of the light-emitting element under control of the light-emitting control signal provided by the light-emitting control line, and the driving circuit generates a current for driving the light-emitting element under control of the potential of the control end of the driving circuit; and

the pixel circuit further comprises a second light-emitting control circuit; the pixel driving method further comprises: a second light-emitting control circuit controls connection between the first end of the driving circuit and the second voltage line under control of the light-emitting control signal.

12 . The pixel driving method according to claim 10 , wherein the pixel circuit further comprises a second reset circuit; the display cycle further comprises an initialization stage set before the data writing stage; the pixel driving method further comprises:

in the initialization stage, the second reset circuit provides a second initial voltage provided by the second initial voltage line to the control end of the driving circuit under control of a reset control signal provided by the reset control line to initialize the control end of the driving circuit.

13 . A display substrate comprising a plurality of rows and columns of pixel circuits disposed on a base substrate;

wherein each of the pixel circuits comprises:

a driving circuit, a first reset circuit, a first node control circuit, a first light-emitting control circuit and a light-emitting element;

wherein a control end of the driving circuit is electrically connected to a first node;

the first reset circuit is directly electrically connected to the first node and the driving circuit, and is electrically connected to a first initial voltage line and a first electrode of the light-emitting element, and is configured to write a first initial voltage provided by the first initial voltage line into the first electrode of the light-emitting element under control of a potential of the first node, to initialize the first electrode of the light-emitting element;

the first node control circuit is electrically connected to a data line, the first node, a first end of the driving circuit and a second end of the driving circuit, and is configured to control the potential of the first node according to a data voltage provided by the data line and a threshold voltage of a driving transistor included in the driving circuit;

the first light-emitting control circuit is electrically connected to a light-emitting control line, a second end of the driving circuit and the first electrode of the light-emitting element, and is configured to control connection between the second end of the driving circuit and the first electrode of the light-emitting element under control of a light-emitting control signal provided by the light-emitting control line;

the driving circuit is configured to generate a driving current under control of the potential of the first node; and

a second electrode of the light-emitting element is electrically connected to the first voltage line.

14 . The display substrate according to claim 13 , wherein the display substrate comprises a first initial voltage line, a reset control line, a scanning line, a light-emitting control line, a second initial voltage line, a high voltage line and a data line;

the pixel circuit comprises a driving circuit, a first reset circuit, a first node control circuit, a first light-emitting control circuit, a second reset circuit, a second light-emitting control circuit and a first reset circuit; the first node control circuit comprises a compensation control circuit and a data writing circuit;

the first reset circuit comprises a first transistor, the first light-emitting control circuit comprises a second transistor, the data writing circuit comprises a third transistor, the compensation control circuit comprises a fourth transistor, the second reset circuit comprises a fifth transistor, the second light-emitting control circuit comprises a sixth transistor, and the driving circuit comprises a driving transistor;

a first electrode of the first transistor is electrically connected to the first initial voltage line, a control electrode of the second transistor and a control electrode of the sixth transistor are both electrically connected to the light-emitting control line, a control electrode of the third transistor and a control electrode of the fourth transistor are both electrically connected to the scanning line, a control electrode of the fifth transistor is electrically connected to the reset control line, a first electrode of the fifth transistor is electrically connected to the second initial voltage line, and a first electrode of the sixth transistor is electrically connected to the high voltage line;

the first initial voltage line, the reset control line, the scanning line, the light-emitting control line and the second initial voltage line extend along a first direction, and the high voltage line and the data line extend along a second direction;

the first initial voltage line, the reset control line, the scanning line, the light-emitting control line and the second initial voltage line are sequentially arranged along the second direction; the first direction intersects the second direction;

the fourth transistor, the second transistor and the first transistor are sequentially arranged along the second direction;

the fifth transistor and the driving transistor are sequentially arranged along the second direction;

the third transistor and the sixth transistor are sequentially arranged along the second direction;

an orthographic projection of a channel of the third transistor on the base substrate and an orthographic projection of a channel of the sixth transistor on the base substrate are arranged between an orthographic projection of the high voltage line on the base substrate and an orthographic projection of the data line on the base substrate; and

an orthographic projection of the gate electrode of the driving transistor on the base substrate is arranged between an orthographic projection of the scanning line on the base substrate and an orthographic projection of the light-emitting control line on the base substrate.

15 . The display substrate according to claim 14 , wherein the pixel circuit further comprises a first capacitor;

a gate electrode of the driving transistor is reused as a first plate of the first capacitor; the first plate of the first capacitor is formed on a first gate metal layer;

a second plate of the first capacitor is formed on a second gate metal layer; and

an orthographic projection of the high voltage line on the base substrate at least partially overlaps with an orthographic projection of a second plate of the first capacitor on the base substrate.