阅读说明：本技术 像素电路及其驱动方法、显示装置及其驱动方法 (Pixel circuit and driving method thereof, display device and driving method thereof ) 是由 于子阳 王铸 胡晟 刘天良 刘果 于 2020-03-31 设计创作，主要内容包括：本公开实施例提供了一种像素电路,包括：布置成矩阵的多个像素单元,每个像素单元包括发光元件和用于驱动发光元件发光的像素驱动电路,像素驱动电路与发光元件电连接于第一节点；第一补偿子电路,电连接到多个像素单元中的每个像素驱动电路,第一补偿子电路配置为向像素驱动电路提供初始化信号,以及经由像素驱动电路获取发光元件发光时第一节点的电压并基于第一节点的电压生成补偿数据信号；以及第二补偿子电路,电连接到多个像素单元中的每个像素驱动电路,配置为使第一节点的电压始终保持在发光元件的设定的工作电压范围内；其中,像素驱动电路还被配置为基于初始化信号对第一节点进行初始化,以及利用补偿数据信号驱动发光元件发光。(The disclosed embodiment provides a pixel circuit, including: a plurality of pixel units arranged in a matrix, each pixel unit including a light emitting element and a pixel driving circuit for driving the light emitting element to emit light, the pixel driving circuit being electrically connected to the light emitting element at a first node; a first compensation sub-circuit electrically connected to each of the pixel driving circuits in the plurality of pixel units, the first compensation sub-circuit configured to supply an initialization signal to the pixel driving circuits, and to acquire a voltage of a first node when the light emitting element emits light via the pixel driving circuits and generate a compensation data signal based on the voltage of the first node; and a second compensation sub-circuit electrically connected to each of the pixel driving circuits in the plurality of pixel units, configured to maintain a voltage of the first node within a set operating voltage range of the light emitting element at all times; wherein the pixel driving circuit is further configured to initialize the first node based on the initialization signal and drive the light emitting element to emit light using the compensation data signal.)

A pixel circuit, comprising:

a plurality of pixel units arranged in a matrix, each pixel unit including a light emitting element and a pixel driving circuit for driving the light emitting element to emit light, the pixel driving circuit being electrically connected to a first node with the light emitting element;

a first compensation sub-circuit electrically connected to each pixel driving circuit in the plurality of pixel units, the first compensation sub-circuit configured to provide an initialization signal to the pixel driving circuit, and to acquire a voltage of the first node when the light emitting element emits light via the pixel driving circuit and generate a compensation data signal based on the voltage of the first node; and

a second compensation sub-circuit electrically connected to each of the pixel driving circuits in the plurality of pixel units, configured to keep a voltage of the first node always within a set operating voltage range of the light emitting element;

wherein the pixel driving circuit is further configured to initialize the first node based on the initialization signal and drive the light emitting element to emit light using the compensation data signal.

The pixel circuit of claim 1, wherein the first compensation sub-circuit comprises:

a switching sub-circuit configured to receive a first switching signal and a second switching signal, and to output the initialization signal at an output terminal of the switching sub-circuit under control of the first switching signal, and to maintain the output terminal in a floating state under control of the second switching signal;

a sampling sub-circuit configured to acquire a voltage of the first node during holding the output terminal in a floating state; and

a data compensation sub-circuit configured to generate the compensated data signal based on a preset compensation model and a voltage of the first node.

The pixel circuit according to claim 2, wherein the switching sub-circuit comprises a first transistor, a second transistor, and a third transistor, wherein

A gate of the first transistor is electrically connected to receive the first switching signal, a first pole of the first transistor is electrically connected to receive the initialization signal, and a second pole of the first transistor is electrically connected to a second pole of the second transistor and serves as the output terminal;

a gate of the second transistor is electrically connected to receive the second switching signal, and a first pole of the second transistor is electrically connected to a first pole of the third transistor;

the grid electrode of the third transistor is electrically connected to receive a sampling control signal, and the second pole of the third transistor is electrically connected with the sampling sub-circuit.

A pixel circuit according to claim 2 or 3, wherein the pixel drive circuit comprises:

a drive sub-circuit that generates a current for causing the light emitting element to emit light;

a light emission control sub-circuit electrically connected to the light emitting element and the driving sub-circuit, configured to receive a first control signal and supply the current for causing the light emitting element to emit light to the light emitting element under the control of the first control signal;

a driving control sub-circuit electrically connected to the driving sub-circuit, configured to receive a compensation data signal and a second control signal, and to provide the compensation data signal to the driving sub-circuit under the control of the second control signal; and

a reset sub-circuit electrically connected to the driving sub-circuit and the first compensation sub-circuit, configured to receive a third control signal and a fourth control signal, and apply an initialization signal provided by the first compensation sub-circuit to the first node or output a voltage of the first node when the light emitting element emits light to the first compensation sub-circuit under the control of the third control signal and the fourth control signal.

A pixel circuit according to any one of claims 2 to 4, wherein the drive sub-circuit comprises a drive transistor, a fourth transistor and a storage capacitor, wherein

The grid electrode of the driving transistor is electrically connected with the first end of the storage capacitor, the drain electrode of the driving transistor is electrically connected with the light-emitting control sub-circuit at a second node, and the source electrode of the driving transistor is electrically connected with the light-emitting control sub-circuit at a third node;

a gate of the fourth transistor is electrically connected to receive the second control signal, a first pole of the fourth transistor is electrically connected to the first end of the storage capacitor, and a second pole of the fourth transistor is electrically connected to the second node;

the second end of the storage capacitor is electrically connected with the first node.

A pixel circuit according to any one of claims 2 to 5, wherein the emission control sub-circuit includes a fifth transistor and a sixth transistor, wherein

A gate of the fifth transistor is electrically connected to receive the first control signal, a first pole of the fifth transistor is electrically connected to receive a first voltage signal, and a second pole of the fifth transistor is electrically connected to a second node;

a gate of the sixth transistor is electrically connected to receive the first control signal, a first pole of the sixth transistor is electrically connected to a third node, and a second pole of the sixth transistor is electrically connected to the first node.

A pixel circuit according to any one of claims 2 to 6, wherein the drive control sub-circuit comprises a seventh transistor having a gate electrically connected to receive the second control signal, a first pole electrically connected to receive the compensation data signal, and a second pole electrically connected to the third node.

The pixel circuit according to any of claims 2 to 7, wherein the second compensation sub-circuit comprises a plurality of compensation capacitors, each compensation capacitor corresponding to each pixel driving circuit, a first end of the compensation capacitor being electrically connected to the first node, and a second end of the compensation capacitor being electrically connected to a gate of the seventh transistor.

The pixel circuit according to any one of claims 2 to 8, wherein the reset sub-circuit comprises an eighth transistor and a ninth transistor, wherein

A gate of the eighth transistor is electrically connected to receive a third control signal, a first pole of the eighth transistor is electrically connected to the first node, and a second pole of the eighth transistor is electrically connected to an output terminal of the switching sub-circuit;

a gate of the ninth transistor is electrically connected to receive a fourth control signal, a first pole of the ninth transistor is electrically connected to receive a first voltage signal, and a second pole of the ninth transistor is electrically connected to the first end of the storage capacitor.

A display device comprising the pixel circuit according to any one of claims 1 to 9.

A method of driving the pixel circuit of claim 1, comprising:

compensating a threshold voltage of a pixel driving circuit so as to eliminate an influence of the threshold voltage on a current flowing through the light emitting element;

generating a compensated data signal using a first compensation sub-circuit; and

and driving the light emitting element in each pixel unit to emit light based on the compensated data signal.

The method of claim 11, wherein the compensation data signal is generated based on a light emission luminance of a selected light emitting element prior to driving the light emitting element in each pixel cell to emit light.

The method of claim 11, wherein the compensation data signal is generated based on the selected light emission luminance of the light emitting element in each pixel cell or based on the light emission luminance of the light emitting element in each pixel cell in the course of driving the light emitting element in each pixel cell to emit light.

The method of any of claims 11 to 13, wherein generating the compensated data signal with the first compensation sub-circuit comprises:

providing a second switching signal, a first control signal and a third control signal having a first level, and providing a first switching signal, a sampling control signal, a second control signal and a fourth control signal having a second level, in a first sampling period; and

in the second sampling period, a second switching signal having a first level, a sampling control signal, a first control signal, and a third control signal are provided, and a first switching signal having a second level, a second control signal, and a fourth control signal are provided.

The method of any one of claims 11 to 14, wherein driving a light emitting element in each pixel cell to emit light based on the compensated data signal comprises:

providing a first switching signal, a third control signal and a fourth control signal having a first level, and providing a second switching signal, a first control signal and a second control signal having a second level in a first driving period;

providing a first switching signal, a second control signal and a third control signal having a first level, and providing a second switching signal, a first control signal and a fourth control signal having a second level in a second driving period; and

in the third driving period, the first switching signal and the first control signal having the first level are supplied, and the second switching signal, the second control signal, the third control signal, and the fourth control signal having the second level are supplied.

A method of displaying using the display device of claim 10, comprising:

generating a compensation data signal using a first compensation sub-circuit of the pixel circuit; and

and driving the light-emitting element in each pixel unit to emit light by using the pixel unit of the pixel circuit based on the compensation data signal.

The method of claim 16, wherein the first compensation sub-circuit generates the compensation data signal based on a light emission luminance of the selected light emitting element prior to driving the light emitting element in each pixel cell to emit light.

The method of claim 16, wherein the first compensation sub-circuit generates the compensation data signal based on a light emission luminance of the light emitting element in each pixel cell in driving the light emitting element in each pixel cell to emit light.