US-12620352-B2 - Pixel circuit and drive method therefor, display panel and display device

US12620352B2US 12620352 B2US12620352 B2US 12620352B2US-12620352-B2

Abstract

Provided are a pixel circuit and a drive method therefor, a display panel and a display device. The pixel circuit includes: a light emitting device; a drive transistor configured to generate, according to a data voltage, a drive current for driving the light emitting device to emit light; a data writing circuit coupled to the drive transistor, where the data writing circuit is configured to input the data voltage in response to a signal applied to the data writing circuit; and a voltage control circuit coupled to the drive transistor, where the voltage control circuit is configured to reset a control electrode, a first electrode and a second electrode of the drive transistor in response to a signal applied to the voltage control circuit before the data voltage is input.

Inventors

Yuanyou QIU

Assignees

Chongqing Boe Display Technology Co., Ltd.
BOE TECHNOLOGY GROUP CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20220424

Claims (13)

1 . A pixel circuit, comprising: a light emitting device; a drive transistor configured to generate, according to a data voltage, a drive current for driving the light emitting device to emit light; a data writing circuit coupled to the drive transistor; and a voltage control circuit comprising a first transistor, a second transistor and a storage capacitor; wherein a control electrode of the first transistor is coupled to a first control signal terminal, a first electrode of the first transistor is coupled to a first initialization signal terminal, and a second electrode of the first transistor is coupled to a control electrode of the drive transistor; a control electrode of the second transistor is coupled to a second control signal terminal, a first electrode of the second transistor is coupled to the control electrode of the drive transistor, and a second electrode of the second transistor is coupled to a second electrode of the drive transistor; and a first electrode of the storage capacitor is coupled to the control electrode of the drive transistor, and a second electrode of the storage capacitor is coupled to a first electrode of the drive transistor; wherein the voltage control circuit is configured to, before the data voltage is input, reset the control electrode, the first electrode and the second electrode of the drive transistor in response to a signal applied to the voltage control circuit; wherein the data writing circuit comprises a fifth transistor and a sixth transistor; a control electrode of the fifth transistor is coupled to a fifth control signal terminal, a first electrode of the fifth transistor is coupled to the first electrode of the drive transistor and a second electrode of the fifth transistor is directly connected to a first electrode of the sixth transistor; and a control electrode of the sixth transistor is coupled to a sixth control signal terminal, and a second electrode of the sixth transistor is coupled to a data signal terminal; wherein the data writing circuit is further configured to: in response to a fifth control signal applied to the fifth control signal terminal and a sixth control signal applied to the sixth control signal terminal, input the data voltage applied to a data signal terminal to the first electrode of the drive transistor; wherein the data writing circuit is further configured to: in response to the fifth control signal applied to the fifth control signal terminal and the sixth control signal applied to the sixth control signal terminal, input the data voltage applied to the data signal terminal to the first electrode of the drive transistor; wherein the second control signal, the fifth control signal, and the sixth control signal are different signals with different timing diagrams, a kickoff moment of an active level of the fifth control signal is earlier than a kickoff moment of an active level of the second control signal and the kickoff moment of the active level of the second control signal is earlier than a kickoff moment of the active level of the sixth control signal, a duration of the active level of the second control signal, a duration of the active level of the fifth control signal and a duration of the active level of the sixth control signal have overlapping time, and the overlapping time is smaller than a duration of an active level of the first control signal and the duration of the active level of the second control signal respectively; wherein the active level of each first, second, fifth and sixth control signal is a level of control signal that, when applied to the control electrode, turns on corresponding first, second, fifth, and sixth transistor; wherein the pixel circuit further comprises a threshold compensation circuit; and the threshold compensation circuit is coupled to the drive transistor; and the threshold compensation circuit is configured to: while the data voltage is input, compensate a threshold voltage of the drive transistor in response to a third control signal applied to a third control signal terminal; wherein the threshold compensation circuit comprises: a third transistor; wherein a control electrode of the third transistor is coupled to the third control signal terminal, a first electrode of the third transistor is directly connected to the control electrode of the drive transistor, and a second electrode of the third transistor is directly coupled to the second electrode of the drive transistor.
2 . The pixel circuit according to claim 1 , wherein the voltage control circuit is further configured to: while the data voltage is input, compensate the threshold voltage of the drive transistor in response to the second control signal applied to the second control signal terminal.
3 . The pixel circuit according to claim 1 , wherein the data writing circuit is further configured to: in response to a fourth control signal applied to a fourth control signal terminal, input the data voltage applied to the data signal terminal to the first electrode of the drive transistor.
4 . The pixel circuit according to claim 3 , wherein the data writing circuit comprises a fourth transistor; wherein a control electrode of the fourth transistor is coupled to the fourth control signal terminal, a first electrode of the fourth transistor is coupled to the data signal terminal, and a second electrode of the fourth transistor is coupled to the first electrode of the drive transistor.
5 . The pixel circuit according to claim 4 , wherein a duration of an active level of the fourth control signal is not longer than a duration of the active level of the first control signal.
6 . The pixel circuit according to claim 1 , wherein at least one of the duration of the active level of of the fifth control signal and the duration of the active level of the sixth control signal is substantially the same as the duration of the active level of the second control signal.
7 . The pixel circuit according to claim 1 , wherein the fifth control signal terminal and the second control signal terminal are a same signal terminal.
8 . The pixel circuit according to claim 1 , wherein the pixel circuit further comprises: an element reset circuit coupled to the light emitting device; wherein the element reset circuit is configured to: in response to a seventh control signal of a seventh control signal terminal, provide a second initialization signal of a second initialization signal terminal to the light emitting device.
9 . The pixel circuit according to claim 8 , wherein the seventh control signal terminal and one of the first control signal terminal to the fourth control signal terminal are a same signal terminal.
10 . A display panel, comprising: a plurality of sub-pixels, wherein at least one of the plurality of sub-pixels comprises the pixel circuit of claim 1 ; a plurality of control signal lines, wherein at least one of the plurality of control signal lines is coupled to the pixel circuit in a row of sub-pixels; and a drive and control circuit, wherein the drive and control circuit is coupled to the plurality of control signal lines.
11 . The display panel according to claim 10 , wherein the plurality of control signal lines comprise a plurality of first control signal lines, a plurality of second control signal lines, a plurality of fifth control signal lines and a plurality of sixth control signal lines; wherein one of the first control signal lines is coupled to a first control signal terminal of a pixel circuit in a row of sub-pixels; one of the second control signal lines is coupled to a second control signal terminal of a pixel circuit in the row of sub-pixels; one of the fifth control signal lines is coupled to a fifth control signal terminal of a pixel circuit in the row of sub-pixels; and one of the sixth control signal lines is coupled to a sixth control signal terminal of a pixel circuit in the row of sub-pixels; the drive and control circuit comprises a first driving control circuit, and the first driving control circuit comprises a plurality of first driving shift register units sequentially arranged; a plurality of first driving shift register units adjacent to each other serve as a first unit group, and one row of sub-pixels correspond to one first unit group; and in the first unit group; a first one of the plurality of first driving shift register units is coupled to a first control signal line coupled to a corresponding row of sub-pixels; a third one of the plurality of first driving shift register units is coupled to a fifth control signal line coupled to the corresponding row of sub-pixels; a fourth one of the plurality of first driving shift register units is coupled to a second control signal line coupled to the corresponding row of sub-pixels; and a fifth one of the plurality of first driving shift register units is coupled to a sixth control signal line coupled to the corresponding row of sub-pixels.
12 . The display panel according to claim 10 , wherein the plurality of control signal lines comprise a plurality of first control signal lines, a plurality of second control signal lines and a plurality of sixth control signal lines; one of the first control signal lines is coupled to a first control signal terminal of a pixel circuit in a row of sub-pixels; one of the second control signal lines is coupled to a second control signal terminal and a fifth control signal terminal of the pixel circuit in a row of sub-pixels; and one of the sixth control signal lines is coupled to a sixth control signal terminal of a pixel circuit in the row of sub-pixels; the drive and control circuit comprises a second driving control circuit, and the second driving control circuit comprises a plurality of second driving shift register units sequentially arranged; a plurality of second driving shift register units adjacent to each other serve as a second unit group, and one row of sub-pixels correspond to one second unit group; and in the second unit group: a first one of the plurality of second driving shift register units is coupled to a first control signal line coupled to a corresponding row of sub-pixels; a third one of the plurality of second driving shift register units is coupled to a second control signal line coupled to the corresponding row of sub-pixels; and a fifth one of the plurality of second driving shift register units is coupled to a sixth control signal line coupled to the corresponding row of sub-pixels.
13 . The display panel according to claim 10 , wherein the plurality of control signal lines comprise plurality of first control signal lines, a plurality of second control signal lines and a plurality of fourth control signal lines; one of the first control signal lines is coupled to a first control signal terminal of a pixel circuit in a row of sub-pixels; one of the second control signal lines is coupled to a second control signal terminal of a pixel circuit in the row of sub-pixels; and one of the fourth control signal lines is coupled to a fourth control signal terminal of a pixel circuit in a row of sub-pixels; the drive and control circuit comprises a third driving control circuit and a fourth driving control circuit; the third driving control circuit comprises a plurality of third driving shift register units sequentially arranged; a plurality of third driving shift register units adjacent to each other serve as a third unit group, and one row of sub-pixels correspond to one third unit group; in the third unit group: a first one of the plurality of third driving shift register units is coupled to a first control signal line coupled to a corresponding row of sub-pixels; and a fifth one of the plurality of third driving shift register units is coupled to a second control signal line coupled to a corresponding row of sub-pixels; the fourth driving control circuit comprises a plurality of fourth driving shift register units sequentially arranged; one row of sub-pixels correspond to one fourth driving shift register unit; and the fourth driving shift register unit is coupled to a fourth control signal line coupled to a corresponding row of sub-pixels.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/CN2022/088832, filed on Apr. 24, 2022, the entire content of which is incorporated herein by reference. FIELD The disclosure relates to the field of display technology, and particularly to a pixel circuit and a drive method therefor, a display panel and a display device. BACKGROUND With advantages of self-illumination and low energy consumption, electroluminescent diodes such as an organic light emitting diode (OLED), a quantum dot light emitting diode (QLED) and a micro light emitting diode (Micro LED) have become a focus of application and research of electroluminescent display devices at present. Generally, pixel circuits are used in the electroluminescent display devices to drive the electroluminescent diodes to emit light. SUMMARY An embodiment of the disclosure provides a pixel circuit. The pixel circuit includes: a light emitting device, a drive transistor configured to generate, according to a data voltage, a drive current for driving the light emitting device to emit light, a data writing circuit coupled to the drive transistor, the data writing circuit being configured to input the data voltage by a data writing circuit in response to a signal applied to the data writing circuit, and a voltage control circuit coupled to the drive transistor, where the voltage control circuit is configured to reset a control electrode, a first electrode and a second electrode of the drive transistor in response to a signal applied to the voltage control circuit, before the data voltage is input. In some examples, the voltage control circuit is further configured to: in response to a first control signal applied to a first control signal terminal, provide a first initialization signal applied to a first initialization signal terminal to the control electrode of the drive transistor, so as to reset the control electrode of the drive transistor; and in response to a second control signal applied to a second control signal terminal, reset the first electrode and the second electrode of the drive transistor. In some examples, the voltage control circuit includes a first transistor, a second transistor and a storage capacitor. A control electrode of the first transistor is coupled to the first control signal terminal, a first electrode of the first transistor is coupled to the first initialization signal terminal, and a second electrode of the first transistor is coupled to the control electrode of the drive transistor. A control electrode of the second transistor is coupled to the second control signal terminal, a first electrode of the second transistor is coupled to the control electrode of the drive transistor, and a second electrode of the second transistor is coupled to the second electrode of the drive transistor. A first electrode of the storage capacitor is coupled to the control electrode of the drive transistor, and a second electrode of the storage capacitor is coupled to the first electrode of the drive transistor. In some examples, the voltage control circuit is further configured to, while the data voltage is input, compensate a threshold voltage of the drive transistor in response to the second control signal applied to the second control signal terminal. In some examples, the pixel circuit further includes a threshold compensation circuit. The threshold compensation circuit is coupled to the drive transistor, and the threshold compensation circuit is configured to: while the data voltage is input, compensate the threshold voltage of the drive transistor in response to a third control signal applied to a third control signal terminal. In some examples, the threshold compensation circuit includes a third transistor. A control electrode of the third transistor is coupled to the third control signal terminal, a first electrode of the third transistor is coupled to the control electrode of the drive transistor, and a second electrode of the third transistor is coupled to the second electrode of the drive transistor. In some examples, the data writing circuit is further configured to: in response to a fourth control signal applied to a fourth control signal terminal, input the data voltage applied to a data signal terminal to the first electrode of the drive transistor. In some examples, the data writing circuit includes a fourth transistor. A control electrode of the fourth transistor is coupled to the fourth control signal terminal, a first electrode of the fourth transistor is coupled to the data signal terminal, and a second electrode of the fourth transistor is coupled to the first electrode of the drive transistor. In some examples, a duration of an active level of the fourth control signal is not longer than a duration of an active level of the first control signal. In some examples, the data writing circuit is further configured to: in response to a fifth control