Pixel circuit and control method therefor, display panel and display apparatus

Abstract

A pixel circuit and a control method therefor, a display panel, and a display apparatus. The pixel circuit comprises: a first drive sub-circuit, a first light-emitting element, a second drive sub-circuit and a second light-emitting element. The first drive sub-circuit is configured to control the magnitude of a drive current flowing through the first light-emitting element, and the second drive sub-circuit is configured to control the magnitude of a drive current flowing through the second light-emitting element. A first electrode of the first light-emitting element is electrically connected to a second electrode of the second light-emitting element; a second electrode of the first light-emitting element is electrically connected to a first control voltage end, so as to receive a first control voltage; and a first electrode of the second light-emitting element is electrically connected to a second control voltage end, so as to receive a second control voltage.

Description

Pixel circuit and control method thereof, display panel and display device

[0001] This application claims priority to Chinese patent application No. 202310898615.X filed on July 20, 2023. The contents of the above-mentioned Chinese patent application disclosure are hereby incorporated by reference in their entirety as a part of this application. Technical Field

[0002] At least one embodiment of the present disclosure relates to a pixel circuit and a control method thereof, a display panel, and a display device. Background Art

[0003] Organic light-emitting diode (OLED) displays are gaining widespread attention due to their wide viewing angles, high contrast, fast response speed, higher brightness, and lower driving voltage compared to inorganic light-emitting devices. These advantages make OLEDs suitable for display devices such as mobile phones, monitors, laptops, digital cameras, and instruments.

[0004] The pixel circuits in OLED displays generally utilize a matrix drive scheme, which is categorized as either active matrix (AM) or passive matrix (PM) depending on whether switching components are incorporated into each pixel unit. While PMOLEDs offer simpler manufacturing processes and lower costs, they suffer from drawbacks such as crosstalk, high power consumption, and a short lifespan, making them unsuitable for high-resolution, large-size displays. In contrast, AMOLEDs integrate a set of thin-film transistors and storage capacitors within each pixel circuit. By controlling the drive of these thin-film transistors and storage capacitors, the current flowing through the OLED is controlled, allowing the OLED to emit light as needed. Compared to PMOLEDs, AMOLEDs require less drive current, consume less power, and have a longer lifespan, meeting the requirements for high-resolution, multi-grayscale, large-size displays. Furthermore, AMOLEDs offer significant advantages in viewing angle, color reproduction, power consumption, and response time, making them suitable for high-information, high-resolution displays.

[0005] With the advancement of display technology, improving the resolution and aperture ratio of OLED display devices is of great significance to improving display quality and greatly enhancing the user experience.

[0006] Summary of the Invention

[0007] At least one embodiment of the present disclosure provides a pixel circuit, comprising: a first driver subcircuit and a first light-emitting element, a second driver subcircuit and a second light-emitting element. The first driver subcircuit is configured to control the magnitude of a drive current flowing through the first light-emitting element; the second driver subcircuit is configured to control the magnitude of a drive current flowing through the second light-emitting element; a first electrode of the first light-emitting element and a second electrode of the second light-emitting element are electrically connected, the second electrode of the first light-emitting element is electrically connected to a first control voltage terminal to receive a first control voltage, and the first electrode of the second light-emitting element is electrically connected to a second control voltage terminal to receive a second control voltage.

[0008] For example, in the pixel circuit provided by at least one embodiment of the present disclosure, at least one of the first light-emitting element and the second light-emitting element is a quantum dot light-emitting element; the first light-emitting element emits light under the action of a first voltage difference between the first electrode and the second electrode of the first light-emitting element, and the second light-emitting element emits light under the action of a second voltage difference between the first electrode and the second electrode of the second light-emitting element.

[0009] For example, in the pixel circuit provided by at least one embodiment of the present disclosure, one of the first light-emitting element and the second light-emitting element is a light-emitting diode element, and the other is a quantum dot light-emitting element; the light-emitting diode element emits light of a first color; the quantum dot light-emitting element includes a first quantum dot and a second quantum dot, the first quantum dot emits light of a second color, and the second quantum dot emits light of a third color.

[0010] For example, in the pixel circuit provided by at least one embodiment of the present disclosure, the first light-emitting element and the second light-emitting element are both quantum dot light-emitting elements; the quantum dot light-emitting elements include a first quantum dot, a second quantum dot and a third quantum dot, and the first quantum dot, the second quantum dot and the third quantum dot respectively emit light of a first color, light of a second color and light of a third color.

[0011] For example, the pixel circuit provided by at least one embodiment of the present disclosure further includes: a first data writing subcircuit and a second data writing subcircuit. The first data writing subcircuit is configured to write a first data signal into a control terminal of the first driving subcircuit in response to a first data scanning signal, and the first driving subcircuit is configured to control the magnitude of the driving current flowing through the first light-emitting element according to the first data signal; and the second data writing subcircuit is configured to write a second data signal into the control terminal of the second driving subcircuit in response to a second data scanning signal, and the second driving subcircuit is configured to control the magnitude of the driving current flowing through the second light-emitting element according to the second data signal.

[0012] For example, the pixel circuit provided by at least one embodiment of the present disclosure further includes: a first storage sub-circuit and a second storage sub-circuit. The first data writing subcircuit is electrically connected to the first end of the first storage subcircuit and is configured to transmit the first data signal to the first end of the first storage subcircuit in response to a first data scanning signal; the first driving subcircuit includes a control end, a first end, and a second end. The control end of the first driving subcircuit is electrically connected to the first end of the first storage subcircuit, the first end of the first driving subcircuit is configured to receive a first power supply voltage, and the second end of the first driving subcircuit, the second end of the first storage subcircuit, the first electrode of the first light-emitting element, and the second electrode of the second light-emitting element are connected to a first node; the second data writing subcircuit is electrically connected to the first end of the second storage subcircuit and is configured to transmit the second data signal to the first end of the second storage subcircuit in response to a second data scanning signal; the second driving subcircuit includes a control end, a first end, and a second end. The control end of the second driving subcircuit is electrically connected to the first end of the second storage subcircuit, the first end of the second driving subcircuit is configured to receive a second power supply voltage, and the second end of the second driving subcircuit is electrically connected to the first end of the second driving subcircuit to receive the second power supply voltage, or the second end of the second storage subcircuit is electrically connected to the first node.

[0013] For example, in a pixel circuit provided by at least one embodiment of the present disclosure, the first driver subcircuit includes a first driver transistor, the first storage subcircuit includes a first storage capacitor, the gate of the first driver transistor is electrically connected to the first electrode of the first storage capacitor, the first electrode of the first driver transistor is configured to receive the first power supply voltage, the second electrode of the first driver transistor and the second electrode of the first storage capacitor are both electrically connected to the first node, and the first driver transistor is configured to control a current for driving the first light-emitting element to emit light under the control of the voltage of the gate of the first driver transistor; the second driver subcircuit includes a second driver transistor, the second storage subcircuit includes a second storage capacitor, the gate of the second driver transistor is electrically connected to the first electrode of the second storage capacitor, the first electrode of the second driver transistor is configured to receive the second power supply voltage, the second electrode of the second driver transistor is electrically connected to the first node, and the second driver transistor is configured to control a current for driving the second light-emitting element to emit light under the control of the voltage of the gate of the second driver transistor; when the second end of the second storage subcircuit is electrically connected to the first end of the second driver subcircuit to receive the second power supply voltage, the second electrode of the second storage capacitor is electrically connected to the first electrode of the second driver transistor; when the second end of the second storage subcircuit is electrically connected to the first node, the second electrode of the second storage capacitor is electrically connected to the first node.

[0014] For example, in the pixel circuit provided by at least one embodiment of the present disclosure, the first data writing sub-circuit includes a first data transistor, the first electrode of the first data transistor is electrically connected to the first electrode of the first storage capacitor and the gate of the first driving transistor, the second electrode of the first data transistor is configured to receive a first data signal, and the first data transistor is configured to write the first data signal into the gate of the first driving transistor and the first storage capacitor in response to a first data scanning signal; the second data writing sub-circuit includes a second data transistor, the first electrode of the second data transistor is electrically connected to the first electrode of the second storage capacitor and the gate of the second driving transistor, the second electrode of the second data transistor is configured to receive a second data signal, and the second data transistor is configured to write the second data signal into the gate of the second driving transistor and the second storage capacitor in response to a second data scanning signal.

[0015] For example, a pixel circuit provided in at least one embodiment of the present disclosure further includes: a first sensing sub-circuit and a first sensing signal line. A first end of the first sensing sub-circuit is electrically connected to the first node, a control end of the first sensing sub-circuit is configured to receive a first sensing scan signal, a second end of the first sensing sub-circuit is electrically connected to the first sensing signal line, the first sensing signal line is electrically connected to a first external detection circuit, and the first sensing sub-circuit is configured to detect electrical characteristics of the sub-pixel to which it belongs via the first external detection circuit in response to the first sensing scan signal to implement external compensation.

[0016] For example, in the pixel circuit provided by at least one embodiment of the present disclosure, the first sensing sub-circuit includes a first sensing transistor, the first electrode of the first sensing transistor is electrically connected to the first node, the second electrode of the first sensing transistor is electrically connected to the first sensing signal line to be connected to the first external detection circuit, the gate of the first sensing transistor is configured to receive the first sensing scan signal, and the first sensing transistor is configured to detect the electrical characteristics of the sub-pixel to which it belongs through the first external detection circuit in response to the first sensing scan signal to achieve external compensation.

[0017] For example, at least one embodiment of the present disclosure provides a pixel circuit further comprising: a second sensing sub-circuit and a second sensing signal line. A first terminal of the second sensing sub-circuit is electrically connected to the first node, a control terminal of the second sensing sub-circuit is configured to receive a second sensing scan signal, a second terminal of the first sensing sub-circuit is electrically connected to the second sensing signal line, the second sensing signal line is electrically connected to a second external detection circuit, and the second sensing sub-circuit is configured to detect electrical characteristics of the sub-pixel to which it belongs via the second external detection circuit in response to the second sensing scan signal to implement external compensation.

[0018] For example, in the pixel circuit provided by at least one embodiment of the present disclosure, the second sensing sub-circuit includes a second sensing transistor, a first electrode of the second sensing transistor is electrically connected to the first node, a second electrode of the second sensing transistor is electrically connected to the second sensing signal line to be connected to the second external detection circuit, a gate of the second sensing transistor is configured to receive the second sensing scan signal, and the second sensing transistor is configured to detect the electrical characteristics of the sub-pixel to which it belongs through the second external detection circuit in response to the second sensing scan signal to achieve external compensation.

[0019] For example, in the pixel circuit provided by at least one embodiment of the present disclosure, the first control voltage terminal and the second control voltage terminal are the same voltage terminal, and the second control voltage and the first control voltage are voltage signals from the same voltage terminal; or, the first control voltage terminal and the second control voltage terminal are different voltage terminals, and the second control voltage and the first control voltage are different voltage signals from different voltage terminals.

[0020] At least one embodiment of the present disclosure also provides a control method for any one of the pixel circuits provided in the embodiments of the present disclosure, the control method comprising: controlling the first light-emitting element and the second light-emitting element to emit light in different time periods respectively, wherein the display period of a frame image includes at least two time periods, the at least two time periods including a first time period and a second time period, in the first time period at least the first light-emitting element emits light of a first color, and in the second time period at least the second light-emitting element emits light of a second color.

[0021] For example, the control method of the pixel circuit provided by at least one embodiment of the present disclosure includes: controlling the first control voltage and the second control voltage to control the first voltage difference between the first electrode and the second electrode of the first light-emitting element and the second voltage difference between the first electrode and the second electrode of the second light-emitting element, wherein, when the first voltage difference is greater than the first turn-on voltage of the first light-emitting element, the first light-emitting element emits light, and when the second voltage difference is greater than the second turn-on voltage of the second light-emitting element, the second light-emitting element emits light.

[0022] For example, in the control method of the pixel circuit provided in at least one embodiment of the present disclosure, the quantum dot light-emitting element includes different quantum dots that respectively emit light of different colors, and the different quantum dots that emit light of different colors respectively correspond to different voltage differences applied between the first electrode and the second electrode of the quantum dot light-emitting element; the control method includes: controlling the range of the voltage difference between the first electrode and the second electrode of the quantum dot light-emitting element to control the corresponding quantum dots to emit light of corresponding colors.

[0023] For example, in the control method of the pixel circuit provided in at least one embodiment of the present disclosure, one of the first light-emitting element and the second light-emitting element is a light-emitting diode element, and the other is a quantum dot light-emitting element, and the quantum dot light-emitting element includes a first quantum dot and a second quantum dot; the control method includes: in the first time period, controlling the light-emitting diode element to emit light of a first color and controlling the first quantum dot to emit light of a second color; and in the second time period, controlling the second quantum dot to emit light of a third color.

[0024] For example, in the control method of a pixel circuit provided by at least one embodiment of the present disclosure, the pixel circuit includes a first data writing sub-circuit and a second data writing sub-circuit, the first data writing sub-circuit is configured to write a first data signal into the control end of the first driving sub-circuit in response to a first data scanning signal, the first driving sub-circuit is configured to control the magnitude of the driving current flowing through the first light-emitting element according to the first data signal, the second data writing sub-circuit is configured to write a second data signal into the control end of the second driving sub-circuit in response to a second data scanning signal, and the second driving sub-circuit is configured to control the magnitude of the driving current flowing through the second light-emitting element according to the second data signal, the control method includes: in the first time period, writing the first data signal for controlling the grayscale of the first color and the grayscale of the second color; and in the second time period, writing the second data signal for controlling the grayscale of the third color.

[0025] For example, in the control method of the pixel circuit provided in at least one embodiment of the present disclosure, one of the first light-emitting element and the second light-emitting element is a light-emitting diode element, and the other is a quantum dot light-emitting element, and the quantum dot light-emitting element includes a first quantum dot and a second quantum dot; the at least two light-emitting periods also include a third period; the control method includes: in the first period, controlling the light-emitting diode element to emit light of a first color; in the second period, controlling the first quantum dot to emit light of a second color; and in the third period, controlling the second quantum dot to emit light of a third color.

[0026] For example, in the control method of the pixel circuit provided by at least one embodiment of the present disclosure, the first light-emitting element and the second light-emitting element are both quantum dot light-emitting elements, and the quantum dot light-emitting elements include a first quantum dot, a second quantum dot and a third quantum dot; the at least two light-emitting periods also include a third period; the control method includes: in the first period, controlling the first quantum dot to emit light of a first color; in the second period, controlling the second quantum dot to emit light of a second color; and in the third period, controlling the third quantum dot to emit light of a third color.

[0027] For example, in the control method of the pixel circuit provided by at least one embodiment of the present disclosure, the pixel circuit also includes a second data writing sub-circuit, and the second data writing sub-circuit is configured to write the second data signal into the control end of the second driving sub-circuit in response to the second data scanning signal, and the second driving sub-circuit is configured to control the magnitude of the driving current flowing through the second light-emitting element according to the second data signal. In this case, the control method includes: writing the first data signal for controlling the grayscale of the first color in the first time period; and writing the second data signal for controlling the grayscale of the second color and the third color in the second time period and the third time period, respectively.

[0028] For example, the control method of the pixel circuit provided by at least one embodiment of the present disclosure includes: controlling the voltage difference between the first electrode and the second electrode of the quantum dot light-emitting element to be within a first range to control the first quantum dot to emit light of the second color; and controlling the voltage difference between the first electrode and the second electrode of the quantum dot light-emitting element to be within a second range to control the second quantum dot to emit light of the third color.

[0029] For example, in the control method of the pixel circuit provided by at least one embodiment of the present disclosure, when the first driving subcircuit includes a first driving transistor and the second driving subcircuit includes a second driving transistor, the control method includes: detecting the electrical characteristics of the pixel circuit, and compensating the pixel circuit according to the electrical characteristics, wherein the electrical characteristics include at least one of the aging degree of the first light-emitting element and / or the second light-emitting element, the threshold voltage of the first driving transistor and / or the second driving transistor, and the carrier mobility, and the aging degree of the first light-emitting element and / or the second light-emitting element includes the influence of the aging of the first light-emitting element and / or the second light-emitting element on the light-emitting structure of the first light-emitting element and / or the second light-emitting element. The parameters of the result include at least one of the gate-source voltage Vgs of the first driving transistor and / or the gate-source voltage Vgs of the second driving transistor, and the driving current flowing through the first light-emitting element and / or the second light-emitting element; the steps of detecting the electrical characteristics of the sub-pixel where the pixel circuit is located, and compensating the pixel circuit according to the electrical characteristics of the sub-pixel include at least two compensation periods, and the control method of the pixel circuit includes: in each compensation period of the at least two compensation periods, for the first light-emitting element and / or the second light-emitting element that emit light, detecting the electrical characteristics of the pixel circuit that drives the first light-emitting element and / or the second light-emitting element to emit light, and compensating the pixel circuit according to the electrical characteristics of the pixel circuit.

[0030] For example, in a method for controlling a pixel circuit provided in at least one embodiment of the present disclosure, one of the first light-emitting element and the second light-emitting element is a light-emitting diode element, and the other is a quantum dot light-emitting element, and the quantum dot light-emitting element includes a first quantum dot and a second quantum dot; the control method includes: in the first time period, controlling the light-emitting diode element to emit light of a first color and controlling the first quantum dot to emit light of a second color, and in the second time period, controlling the second quantum dot to emit light of a third color, the at least two compensation time periods include a first compensation time period and a second compensation time period, and the method for controlling the pixel circuit includes: in the first compensation time period, respectively detecting electrical characteristics of pixel circuits that drive the first light-emitting element to emit light of the first color and the second light-emitting element to emit light of the second color, and converting the detected electrical characteristics into digital signals, respectively, and simultaneously compensating for the light emission conditions of the first light-emitting element and the second light-emitting element according to the digital signals through the first data signal; and in the second compensation time period, detecting electrical characteristics of the pixel circuit that drives the second light-emitting element to emit light of the third color, and converting the detected electrical characteristics into digital signals, and compensating for the light emission condition of the second light-emitting element according to the digital signals through the second data signal.

[0031] For example, in the control method of the pixel circuit provided by at least one embodiment of the present disclosure, the at least two light-emitting periods include a first period, a second period, and a third period, and the control method includes: in the first period, controlling the first light-emitting element to emit light of a first color; in the second period, controlling the second light-emitting element to emit light of a second color, and in the third period, controlling the second light-emitting element to emit light of a third color, in the case where the at least two compensation periods include a first compensation period, a second compensation period, and a third compensation period, the control method of the pixel circuit includes: in the first compensation period, detecting the electrical characteristics of the pixel circuit that drives the first light-emitting element to emit light of the first color, and using the detected electrical characteristics as the input. The electrical characteristic of the pixel circuit that drives the second light-emitting element to emit the second color of light is converted into a digital signal, and the light-emitting condition of the first light-emitting element is compensated through the first data signal according to the digital signal; in the second compensation period, the electrical characteristic of the pixel circuit that drives the second light-emitting element to emit the second color of light is detected, and the detected electrical characteristic is converted into a digital signal, and the light-emitting condition of the second light-emitting element is compensated through the second data signal according to the digital signal; and in the third compensation period, the electrical characteristic of the pixel circuit that drives the second light-emitting element to emit the third color of light is detected, and the detected electrical characteristic is converted into a digital signal, and the light-emitting condition of the second light-emitting element is compensated through the second data signal according to the digital signal.

[0032] At least one embodiment of the present disclosure further provides a display panel, which includes any one of the pixel circuits provided in the embodiments of the present disclosure.

[0033] For example, the display panel provided by at least one embodiment of the present disclosure includes a sub-pixel, and the sub-pixel includes any one of the pixel circuits provided by the embodiments of the present disclosure; the sub-pixel includes a substrate, and at least part of the pixel circuit is arranged on the main surface of the substrate, and the sub-pixel includes the first light-emitting element and the second light-emitting element stacked in a direction perpendicular to the main surface of the substrate, the first light-emitting element includes a first electrode, a first light-emitting layer, and a second electrode stacked in sequence perpendicular to the main surface of the substrate, and the second light-emitting element includes a first electrode, a first light-emitting layer, and a second electrode stacked in sequence perpendicular to the main surface of the substrate, and the first electrode of the first light-emitting element and the second electrode of the second light-emitting element are electrically connected; the first light-emitting element and the second light-emitting element are configured to emit light in different time periods respectively, and the display period of a frame of image includes at least two time periods, and the at least two time periods include a first time period and a second time period, in the first time period at least the first light-emitting element emits light of a first color, and in the second time period at least the second light-emitting element emits light of a second color.

[0034] For example, in the display panel provided in at least one embodiment of the present disclosure, the first electrode of the first light-emitting element and the second electrode of the second light-emitting element are adjacent to and in contact with each other; or, the first electrode of the first light-emitting element and the second electrode of the second light-emitting element constitute an integrated common electrode.

[0035] For example, in the display panel provided by at least one embodiment of the present disclosure, when one of the first light-emitting element and the second light-emitting element is a light-emitting diode element and the other is a quantum dot light-emitting element, and the quantum dot light-emitting element includes a first quantum dot and a second quantum dot, the quantum dot light-emitting element includes a quantum dot light-emitting layer, and the quantum dot light-emitting layer includes a plurality of quantum dot sublayers stacked in a direction perpendicular to the main surface of the substrate, each of the quantum dot sublayers includes a plurality of first quantum dots and a plurality of second quantum dots distributed alternately, and the first quantum dots and the second quantum dots are configured to be able to distribute light excited to different colors.

[0036] At least one embodiment of the present disclosure further provides a display device, which includes any one of the display panels provided in the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0038] FIG1 is a schematic overall plan view of a display substrate;

[0039] FIG2 is a schematic overall plan view of a display substrate provided by an embodiment of the present disclosure;

[0040] FIG3 is a schematic diagram of a pixel circuit provided in accordance with an embodiment of the present disclosure;

[0041] FIG4 is a timing diagram of a control method of the pixel circuit shown in FIG3 ;

[0042] FIG5A is a schematic diagram of a circuit conduction state in the first period 1 shown in FIG4 ;

[0043] FIG5B is a schematic diagram of the circuit conduction state in the second period 2 shown in FIG4 ;

[0044] FIG6 is a timing diagram of another control method of the pixel circuit shown in FIG3 ;

[0045] FIG7A is a schematic diagram of the circuit conduction state in the first period 1 shown in FIG6 ;

[0046] FIG7B is a schematic diagram of the circuit conduction state in the second period 2 shown in FIG6 ;

[0047] FIG7C is a schematic diagram of the circuit conduction state in the third period 3 shown in FIG6 ;

[0048] FIG8 is a schematic diagram of another pixel circuit provided by an embodiment of the present disclosure;

[0049] FIG9A is a schematic diagram of a pixel circuit connected to an external detection circuit according to an embodiment of the present disclosure;

[0050] FIG9B is an example of the pixel circuit shown in FIG9A connected to an external detection circuit;

[0051] FIG10 is a timing diagram of the compensation process of the pixel circuit shown in FIG9A ;

[0052] FIG11 is a schematic diagram of another pixel circuit provided in an embodiment of the present disclosure;

[0053] FIG12 is a timing diagram of a control method for the pixel circuit shown in FIG11 ;

[0054] FIG13A is a schematic structural diagram of a first light-emitting element and a second light-emitting element of a pixel circuit provided in one embodiment of the present disclosure;

[0055] FIG13B is another schematic diagram of the structure of the first light-emitting element and the second light-emitting element of the pixel circuit provided by an embodiment of the present disclosure;

[0056] FIG13C is a schematic diagram of another structure of the first light-emitting element and the second light-emitting element of the pixel circuit provided by an embodiment of the present disclosure;

[0057] FIG14 is a schematic diagram of a display device provided in accordance with an embodiment of the present disclosure. DETAILED DESCRIPTION

[0058] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. The embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0059] Unless otherwise defined, the technical or scientific terms used herein should have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0060] FIG1 is a schematic diagram of an overall plan view of a display substrate. Referring to FIG1 , a typical display substrate 101 includes a display area DR and a non-display area NR that at least partially surrounds the display area DR. The display substrate 101 includes a plurality of display units PU located in the display area DR and arranged in an array. The display unit PU performs a display function. Each display unit PU includes a plurality of sub-pixels R / G / B. For example, FIG1 takes a display unit PU as an example including three sub-pixels, namely a first sub-pixel R emitting red light, a second sub-pixel G emitting green light, and a second sub-pixel B emitting blue light. Of course, the number of sub-pixels included in a display unit PU may also be less than three or more than three. Each sub-pixel 100 includes a light-emitting element and a pixel circuit for driving the light-emitting element. The display substrate 101 also includes a plurality of scan lines GL and a plurality of data lines DL. The plurality of scan lines GL and the plurality of data lines DL intersect with each other to define a plurality of pixel areas arranged in an array in the display area DR. The pixel circuit for a sub-pixel is provided in each pixel area.

[0061] It can be seen that in this display substrate 101, on the one hand, the multiple sub-pixels R / G / B of a display unit PU each occupy a certain area, thus limiting the improvement of the resolution (PPI) of the display substrate 101 and hindering the realization of a breakthrough increase in PPI. On the other hand, for each sub-pixel R / G / B, a corresponding signal line needs to be set. For example, at least an independent data line DL and power line need to be set for each sub-pixel R / G / B, resulting in a large number of signal lines, which limits the improvement of the aperture ratio of the display substrate 101. However, improving the resolution and aperture ratio of OLED display devices is of great significance to improving display quality and greatly enhancing the user experience.

[0062] At least one embodiment of the present disclosure provides a pixel circuit, comprising: a first driver subcircuit and a first light-emitting element, a second driver subcircuit and a second light-emitting element. The first driver subcircuit is configured to control the magnitude of a drive current flowing through the first light-emitting element; the second driver subcircuit is configured to control the magnitude of a drive current flowing through the second light-emitting element; a first electrode of the first light-emitting element and a second electrode of the second light-emitting element are electrically connected, the second electrode of the first light-emitting element is electrically connected to a first control voltage terminal to receive a first control voltage, and the first electrode of the second light-emitting element is electrically connected to a second control voltage terminal to receive a second control voltage.

[0063] At least one embodiment of the present disclosure also provides a control method for any one of the pixel circuits provided in the embodiments of the present disclosure, the control method comprising: controlling the first light-emitting element and the second light-emitting element to emit light in different time periods respectively, wherein the display period of a frame image includes at least two time periods, the at least two time periods including a first time period and a second time period, in the first time period at least the first light-emitting element emits light of a first color, and in the second time period at least the second light-emitting element emits light of a second color.

[0064] At least one embodiment of the present disclosure further provides a display panel, which includes sub-pixels, and the sub-pixels include any one of the pixel circuits provided in the embodiments of the present disclosure; the sub-pixels include the first light-emitting element and the second light-emitting element arranged in a stacked manner; the first light-emitting element and the second light-emitting element are configured to emit light in different time periods, respectively, and the display period of a frame of image includes at least two time periods, and the at least two time periods include a first time period and a second time period, in the first time period at least the first light-emitting element emits light of a first color, and in the second time period at least the second light-emitting element emits light of a second color.

[0065] At least one embodiment of the present disclosure further provides a display device, which includes any one of the display panels provided in the embodiments of the present disclosure.

[0066] The pixel circuit provided by the embodiment of the present disclosure can be applied to display devices such as display substrates or display panels. Since in a pixel circuit, the first electrode of the first light-emitting element is electrically connected to the second electrode of the second light-emitting element, and the first driving sub-circuit and the second driving sub-circuit independently drive different light-emitting elements, color display can be achieved in a sub-pixel by having the first light-emitting element and the second light-emitting element emit light of different colors respectively. Compared with a traditional pixel circuit in which a sub-pixel includes only a light-emitting element that emits light of one color, and the pixel circuit of the sub-pixel drives the light-emitting element to emit light of only one color, and a plurality of sub-pixels emit light of different colors respectively to achieve color display, the pixel circuit provided by the embodiment of the present disclosure realizes the merging of multiple sub-pixels that traditionally emit light of multiple colors. For example, the pixel circuit provided by the embodiment of the present disclosure converts the first sub-pixel R, the second sub-pixel G that emits green light, and the second sub-pixel B that emits blue light in Figure 1 into one sub-pixel RGB. Thus, on the one hand, in a display substrate using the pixel circuit provided by the embodiment of the present disclosure, by arranging the first light-emitting element and the second light-emitting element in the same pixel, it is possible to merge a plurality of sub-pixels having different luminous colors, thereby reducing the area occupied by pixels having multiple luminous colors, thereby further improving the pixel aperture ratio and being able to achieve a higher resolution (PPI), which can be used to realize a display panel with an ultra-high PPI; on the other hand, due to the realization of pixel merging, the number of transistors, such as thin film transistors (TFTs), of the entire display panel using the pixel circuit is greatly reduced, and there is no need to provide a data line and a power supply voltage line to each of the first sub-pixel R, the second sub-pixel G emitting green light, and the second sub-pixel B emitting blue light in Figure 1, respectively, thereby greatly reducing the number of signal lines of the entire display panel using the pixel circuit and improving the pixel aperture ratio.

[0067] For example, FIG2 is a schematic overall plan view of a display substrate provided in one embodiment of the present disclosure. Referring to FIG2 , for example, a display substrate 10 provided in at least one embodiment of the present disclosure includes a display area DR and a non-display area NR at least partially surrounding the display area DR. The display substrate 10 includes a plurality of display units PU arranged in an array within the display area DR. The display units PU perform display functions. Each display unit PU includes a sub-pixel RGB. For example, the display substrate 10 includes a base substrate 1, which includes a main surface. The pixel array including the plurality of display units PU is disposed on the main surface of the base substrate 1. Each sub-pixel RGB includes a first light-emitting element EL1, a second light-emitting element EL2, and a pixel circuit for driving the first and second light-emitting elements EL1 and EL2. For example, the first and second light-emitting elements EL1 and EL2 are stacked in a direction perpendicular to the main surface of the base substrate 1. The first and second light-emitting elements EL1 and EL2 emit light of different colors. Thus, a single sub-pixel can emit light of multiple colors. For example, FIG1 illustrates a display unit PU emitting three different colors of light. For example, a single sub-pixel RGB can emit red, green, and blue light. Of course, the types of light that can be emitted by a display unit PU are not limited to three, and can also be less than three or more than three.

[0068] For example, as shown in FIG1 , the display substrate 10 further includes a plurality of scan lines GL and a plurality of data lines DL. The plurality of scan lines GL and the plurality of data lines DL intersect with each other to define a plurality of pixel regions arranged in an array in the display region DR, each of which is provided with a pixel circuit for an RGB sub-pixel.

[0069] For example, as shown in FIG1 , the display substrate 10 may further include a scan driver circuit SC and a data driver circuit DC located in the non-display region NR. The scan driver circuit SC is, for example, a gate driver circuit (e.g., a GOA driver circuit). The scan driver circuit SC is connected to the pixel circuit via a scan line GL to provide various scan signals, and the data driver circuit DC is connected to the pixel circuit via a data line DL to provide data signals. The positional relationship of the scan driver circuit SC and the data driver circuit DC, the scan lines GL, and the data lines DL in the display substrate shown in FIG1 is only an example, and the actual arrangement position can be designed as needed.

[0070] For example, the display substrate 10 may further include a control circuit (not shown). For example, the control circuit is configured to control the data drive circuit DC to apply the data signal and control the gate drive sub-circuit to apply the scan signal. An example of the control circuit is a timing control circuit (T-con). The control circuit may be in various forms, for example, including a processor and a memory, the memory including executable code, and the processor running the executable code to perform the above-mentioned detection method.

[0071] For example, the processor may be a central processing unit (CPU) or other forms of processing devices with data processing capabilities and / or instruction execution capabilities, such as a microprocessor, a programmable logic controller (PLC), etc.

[0072] For example, the storage device may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), a hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor may execute the functions desired by the program instructions. Various application programs and various data may also be stored in the computer-readable storage medium.

[0073] Of course, the pixel circuit of a single pixel including the stacked OLED light-emitting device and the QD light-emitting device is not limited to the 5T2C (i.e., 5 transistors and 2 capacitors) pixel circuit described above. It can be designed as needed and can be an nTmC (n, m are positive integers) pixel circuit. In different embodiments, the pixel circuit can further include a compensation subcircuit, including an internal compensation subcircuit or an external compensation subcircuit. The compensation subcircuit can include transistors, capacitors, etc. For example, as needed, the pixel circuit can further include a reset circuit, a light emission control subcircuit, a detection circuit, etc.

[0074] The structures of the first light-emitting element and the second light-emitting element will be described in detail later. Next, a pixel circuit for driving the first light-emitting element and the second light-emitting element to emit light of different colors to achieve color display will be described.

[0075] FIG3 is a schematic diagram of a pixel circuit provided by an embodiment of the present disclosure. Referring to FIG3 , the pixel circuit provided by at least one embodiment of the present disclosure includes: a first driving subcircuit 1A and a first light-emitting element EL1, a second driving subcircuit 1B and a second light-emitting element EL2. The first driving subcircuit 1A is configured to control the magnitude of the driving current flowing through the first light-emitting element EL1, and the second driving subcircuit 1B is configured to control the magnitude of the driving current flowing through the second light-emitting element EL2. For example, the first driving subcircuit 1A and the second driving subcircuit 1B independently control the magnitude of the driving current flowing through the first light-emitting element EL1 and the magnitude of the driving current flowing through the second light-emitting element EL2, respectively, and the two are not coupled. The first electrode of the first light-emitting element EL1 and the second electrode of the second light-emitting element EL2 are electrically connected, the second electrode of the first light-emitting element EL1 is electrically connected to the first control voltage terminal to receive the first control voltage VDC1, and the first electrode of the second light-emitting element EL2 is electrically connected to the second control voltage terminal to receive the second control voltage VDC2.

[0076] Referring to FIGS. 2 and 3, in a pixel circuit provided in an embodiment of the present disclosure, a first electrode of a first light-emitting element EL1 is electrically connected to a second electrode of a second light-emitting element EL2, and a first driving sub-circuit 1A and a second driving sub-circuit 1B independently drive different light-emitting elements respectively. Thus, in a sub-pixel RGB, color display can be achieved by the first light-emitting element EL1 and the second light-emitting element EL2 emitting different colors of light respectively. Compared with the conventional pixel circuit shown in FIG. 1, in which a sub-pixel only includes a light-emitting element that emits one color of light, the pixel circuit of the embodiment of the present disclosure drives the light-emitting element to emit only one color of light, and color display is achieved by multiple sub-pixels emitting different colors of light respectively. The pixel circuit provided in the embodiment of the present disclosure realizes the combination of multiple conventional sub-pixels that emit multiple colors of light respectively. For example, the pixel circuit provided in the embodiment of the present disclosure converts the first sub-pixel R that emits red light, the second sub-pixel G that emits green light, and the third sub-pixel B that emits blue light in FIG. 1 into a sub-pixel RGB. Thus, on the one hand, in the display substrate 10 adopting the pixel circuit provided in the embodiment of the present disclosure, by arranging the first light-emitting element EL1 and the second light-emitting element EL2 in the same pixel, the combination of multiple sub-pixels with different light-emitting colors is realized, reducing the area occupied by pixels with multiple light-emitting colors, thereby further improving the pixel aperture ratio and enabling a higher resolution (PPI), which can be used to implement a display panel with an ultra-high PPI. On the other hand, due to the realization of pixel combination, the number of transistors such as thin-film transistors (TFTs) in the entire display panel adopting this pixel circuit is greatly reduced. Moreover, it is not necessary to separately provide data lines and power supply voltage lines for each of the first sub-pixel R, the second sub-pixel G that emits green light, and the second sub-pixel B that emits blue light in FIG. 1, greatly reducing the number of signal lines in the entire display panel adopting this pixel circuit and improving the pixel aperture ratio.

[0077] The first light-emitting element EL1 emits light under the action of a first voltage difference VN1 - VDC1 between the first electrode and the second electrode of the first light-emitting element EL1, and the second light-emitting element EL2 emits light under the action of a second voltage difference VDC2 - VN1 between the first electrode and the second electrode of the second light-emitting element EL2. When VN1 - VDC1 > VEL1 (VEL1 is the starting voltage of the first light-emitting element EL1), the first light-emitting element EL1 emits light. On the contrary, when VN1 - VDC1 < VEL1, the first light-emitting element EL1 is turned off; when VDC2 – VN1 > VEL2 (VEL2 is the starting voltage of the second light-emitting element EL2), the second light-emitting element EL2 emits light. For example, the first light-emitting element EL1 and the second light-emitting element EL2 can be controlled to display different colors分时 within one frame, and finally full-color display can be achieved through color mixing.

[0078] For example, at least one of the first light-emitting element EL1 and the second light-emitting element EL2 is a quantum dot (QD) light-emitting element. For example, one of the first light-emitting element EL1 and the second light-emitting element EL2 is a light-emitting diode (OLED) element, and the other is a quantum dot (QD) light-emitting element. For example, the first light-emitting element EL1 is a light-emitting diode element, and the second light-emitting element EL2 is a quantum dot (QD) light-emitting element. FIG3 describes the pixel circuit using the example of a case where the first light-emitting element EL1 is a light-emitting diode element, such as an organic light-emitting diode (OLED) element, and the second light-emitting element EL2 is a quantum dot (QD) light-emitting element.

[0079] Referring to Figure 3, the brightness of the first light-emitting element EL1 (i.e., a light-emitting diode element) is positively correlated with the difference between the first voltage difference VN1-VDC1. Since the second light-emitting element EL2 is a quantum dot light-emitting element, for example, the second light-emitting element EL2 (i.e., a quantum dot light-emitting element) includes multiple quantum dots with different luminous colors. The emission wavelengths of different quantum dot light-emitting elements are discontinuous and are related to the second voltage difference. That is, under the influence of different values ​​of the second voltage difference VDC2-VN1, the quantum dot light-emitting element emits different luminous colors, that is, different types of quantum dots emit different colors of light. In this way, the first light-emitting element EL1 and the second light-emitting element EL2 can be controlled by the pixel circuit to display different colors in a time-sharing manner within a frame, and ultimately full-color display can be achieved through color mixing.

[0080] For example, in the embodiment shown in FIG3 , the first light-emitting element EL1, i.e., an organic light-emitting diode (OLED) element, emits light of a first color, e.g., blue light; the second light-emitting element EL2 (i.e., a quantum dot light-emitting element) includes a first quantum dot and a second quantum dot, wherein the first quantum dot emits light of a second color, and the second quantum dot emits light of a third color, e.g., red light, and green light. Of course, in other embodiments, the colors of the first, second, and third colors are not limited to the above. This embodiment takes this as an example, and the types of quantum dots included in the second light-emitting element are not limited to two. For example, the second light-emitting element may also include quantum dots that emit light of colors other than red and green. Based on the design principles of the disclosed embodiments, these can be adjusted as needed.

[0081] 3 , for example, a pixel circuit provided by an embodiment of the present disclosure further includes: a first data writing sub-circuit 2A and a second data writing sub-circuit 2B. The first data writing sub-circuit 2A is configured to write a first data signal Data1 into the control terminal of the first driver sub-circuit 1A in response to a first data scanning signal Gate1. The first driver sub-circuit 1A is configured to control the magnitude of the drive current flowing through the first light-emitting element EL1 based on the first data signal Data1. The second data writing sub-circuit 2B is configured to write a second data signal Data2 into the control terminal of the second driver sub-circuit 1B in response to a second data scanning signal Gate2. The second driver sub-circuit 1B is configured to control the magnitude of the drive current flowing through the second light-emitting element EL2 based on the second data signal Data2. This allows the first data signal Data1 to be written into the control terminal of the first driver sub-circuit 1A for controlling the magnitude of the drive current flowing through the first light-emitting element EL1, and the second data signal Data2 to be written into the control terminal of the second driver sub-circuit 1B for controlling the magnitude of the drive current flowing through the second light-emitting element EL2.

[0082] 3 , for example, the pixel circuit further includes a first storage sub-circuit 3A and a second storage sub-circuit 3B. A first data write sub-circuit 2A is electrically connected to a first terminal of the first storage sub-circuit 3A and is configured to transmit a first data signal Data1 to the first terminal of the first storage sub-circuit 3A in response to a first data scan signal Gate1. A first driver sub-circuit 1A includes a control terminal, a first terminal, and a second terminal. The control terminal of the first driver sub-circuit 1A is electrically connected to the first terminal of the first storage sub-circuit 3A. The first terminal of the first driver sub-circuit 1A is configured to receive a first power supply voltage VDD. The second terminal of the first driver sub-circuit 1A, the second terminal of the first storage sub-circuit 3A, the first electrode of the first light-emitting element EL1, and the second electrode of the second light-emitting element EL2 are connected to a first node N1. The second data writing sub-circuit 2B is electrically connected to the first end of the second storage sub-circuit 3B and is configured to transmit the second data signal Data2 to the first end of the second storage sub-circuit 3B in response to the second data scanning signal Gate2; the second driving sub-circuit 1B includes a control end, a first end, and a second end. The control end of the second driving sub-circuit 1B is electrically connected to the first end of the second storage sub-circuit 3B, the first end of the second driving sub-circuit 1B is configured to receive the second power supply voltage VSS, and the second end of the second driving sub-circuit 1B is electrically connected to the first node N1; the second end of the second storage sub-circuit 3B is electrically connected to the first end of the second driving sub-circuit 1B to receive the second power supply voltage VSS. In this way, the first data signal Data1 written by the first data writing circuit 2A to the control end of the first driving sub-circuit 1A can be stored in the first storage sub-circuit 3A, so that a driving current for driving the first light-emitting element EL1 to emit light can be generated according to the first data signal Data1 during the light-emitting stage, and the second data signal Data2 written by the second data writing circuit 2B to the control end of the second driving sub-circuit 1B can be stored in the second storage sub-circuit 3B, so that a driving current for driving the second light-emitting element EL2 to emit light can be generated according to the second data signal Data2 during the light-emitting stage.

[0083] For example, the first power supply voltage is a high power supply voltage VDD, the second power supply voltage is a low power supply voltage VSS, and the second power supply voltage terminal is a ground terminal.

[0084] For example, the first driver sub-circuit 1A includes a first driver transistor T2, the first storage sub-circuit 3A includes a first storage capacitor C1, the gate of the first driver transistor T2 is electrically connected to the first electrode of the first storage capacitor C1, the first electrode of the first driver transistor T2 is configured to receive a first power supply voltage VDD, the second electrode of the first driver transistor T2 and the second electrode of the first storage capacitor C1 are both electrically connected to a first node N1, and the first driver transistor T2 is configured to control a current for driving the first light-emitting element EL1 to emit light under the control of a voltage at the gate of the first driver transistor T2; the second driver sub-circuit 1B includes a second driver transistor T4, the second storage sub-circuit 3B includes a second storage capacitor C2, the gate of the second driver transistor T4 is electrically connected to the first electrode of the second storage capacitor C2, the first electrode of the second driver transistor T4 is configured to receive a second power supply voltage VSS, the second electrode of the second driver transistor T4 is electrically connected to the first node N1, and the second driver transistor T4 is configured to control a current for driving the second light-emitting element EL2 to emit light under the control of a voltage at the gate of the second driver transistor T4; the second electrode of the second storage capacitor C2 is electrically connected to the first electrode of the second driver transistor T4. In this way, the first data signal Data1 is stored in the first storage capacitor C1, and the second data signal Data2 is stored in the second storage capacitor C2.

[0085] For example, the first data writing sub-circuit 2A includes a first data transistor T1, a first electrode of the first data transistor T1 is electrically connected to the first electrode of the first storage capacitor C1 and the gate of the first driving transistor T2, and a second electrode of the first data transistor T1 is configured to receive a first data signal Data1, and the first data transistor T1 is configured to write the first data signal Data1 into the gate of the first driving transistor T2 and the first storage capacitor C1 in response to a first data scanning signal Gate1; the second data writing sub-circuit 2B includes a second data transistor T5, a first electrode of the second data transistor T5 is electrically connected to the first electrode of the second storage capacitor C2 and the gate of the second driving transistor T4, and a second electrode of the second data transistor T5 is configured to receive a second data signal Data2, and the second data transistor T5 is configured to write the second data signal Data2 into the gate of the second driving transistor T4 and the second storage capacitor C2 in response to a second data scanning signal Gate2.

[0086] Referring to FIG. 3 , for example, the pixel circuit further includes a first sensing sub-circuit 4A and a first sensing signal line SENSE1. A first terminal of the first sensing sub-circuit 4A is electrically connected to a first node N1. A control terminal of the first sensing sub-circuit 4A is configured to receive a first sensing scan signal Gate3. A second terminal of the first sensing sub-circuit 4A is electrically connected to the first sensing signal line SENSE1. The first sensing signal line SENSE1 is electrically connected to a first external detection circuit. The first sensing sub-circuit 4A is configured to detect electrical characteristics of the pixel circuit of the corresponding sub-pixel via the first external detection circuit in response to the first sensing scan signal Gate3 to implement external compensation. The electrical characteristics may include, for example, at least one of the threshold voltage and / or carrier mobility of the first drive transistor T2, the threshold voltage and / or carrier mobility of the second drive transistor T4, and the drive current of the first light-emitting element EL1 and / or the second light-emitting element EL2. The first external detection circuit may be, for example, a conventional circuit including a digital-to-analog converter (DAC) and an analog-to-digital converter (ADC). The first external detection circuit and detection and compensation methods will be described below.

[0087] Referring to Figure 3, for example, the first sensing sub-circuit 4A includes a first sensing transistor T3, a first electrode of the first sensing transistor T3 is electrically connected to the first node N1, a second electrode of the first sensing transistor T3 is electrically connected to the first sensing signal line SENSE1 to be connected to the first external detection circuit, and a gate of the first sensing transistor T3 is configured to receive a first sensing scan signal Gate3. The first sensing transistor T3 is configured to detect the electrical characteristics of the pixel circuit of the sub-pixel to which it belongs through the first external detection circuit in response to the first sensing scan signal Gate3 to achieve external compensation.

[0088] The transistors used in the embodiments of the present disclosure may all be thin film transistors or field effect transistors or other switching devices with the same characteristics. The embodiments of the present disclosure are all described by taking thin film transistors as an example. The source and drain of the transistors used here may be symmetrical in structure, so their source and drain may be structurally indistinguishable. In the embodiments of the present disclosure, in order to distinguish the two poles of the transistor other than the gate, one of the poles is directly described as the first pole and the other pole as the second pole. In addition, transistors can be divided into N-type and P-type transistors according to the characteristics of the transistor. When the transistor is a P-type transistor, the turn-on voltage is a low-level voltage (for example, 0V, -5V, -10V or other suitable voltages), and the turn-off voltage is a high-level voltage (for example, 5V, 10V or other suitable voltages); when the transistor is an N-type transistor, the turn-on voltage is a high-level voltage (for example, 5V, 10V or other suitable voltages), and the turn-off voltage is a low-level voltage (for example, 0V, -5V, -10V or other suitable voltages). It should be noted that, in the following description, the transistor in FIG. 3 is taken as an N-type transistor as an example, but this is not intended to limit the present disclosure.

[0089] For example, at least one embodiment of the present disclosure further provides a method for controlling a pixel circuit, the method comprising: controlling a first light-emitting element EL1 and a second light-emitting element EL2 to emit light during different time periods, wherein a display period of a frame of image includes at least two time periods, the at least two time periods including a first time period and a second time period, wherein during the first time period, at least the first light-emitting element EL1 emits light of a first color, and during the second time period, at least the second light-emitting element EL2 emits light of a second color. In this method for controlling a pixel circuit, the first light-emitting element EL1 and the second light-emitting element EL2 are driven to emit light in a time-sharing manner, so that the first light-emitting element EL1 and the second light-emitting element EL2 emit two colors of light during the at least two time periods, respectively, to achieve color display.

[0090] Taking the pixel circuit shown in Figure 3 as an example, for example, the control method of the pixel circuit provided by at least one embodiment of the present disclosure includes: controlling the first control voltage VDC1 and the second control voltage VDC2 to control the first voltage difference between the first electrode and the second electrode of the first light-emitting element EL1 and the second voltage difference between the first electrode and the second electrode of the second light-emitting element EL2; when the first voltage difference is greater than the first turn-on voltage of the first light-emitting element EL1, the first light-emitting element EL1 emits light; when the second voltage difference is greater than the second turn-on voltage of the second light-emitting element EL2, the second light-emitting element EL2 emits light.

[0091] For example, FIG4 is a timing diagram of a control method for the pixel circuit shown in FIG3 , that is, a timing diagram of the working process of the pixel circuit. Referring to FIG3 and FIG4 , a frame of image includes a first time period 1 and a second time period 2. For example, a frame of image is divided into two time periods, namely, the first time period 1 and the second time period 2. For example, here, the first time period 1 is the first 1 / 2 frame, and the second time period 2 is the second 1 / 2 frame. In this case, the luminous duration of each color is basically the same, which is conducive to obtaining a better color display effect and reducing the difficulty of control. Of course, this is not limited to this case. The duration of the first time period 1 and the second time period 2 can also be unequal.

[0092] 3 and 4 , for example, the first light-emitting element EL1 is an OLED element, the first electrode of the first light-emitting element EL1 is the cathode, the second electrode of the first light-emitting element EL1 is the anode of the OLED element and is configured to receive a first control voltage VDC1. For example, the second light-emitting element EL2 is a quantum dot (QD) light-emitting element, the second electrode of the second light-emitting element EL2 is the cathode of the quantum dot light-emitting element, the first electrode of the second light-emitting element EL2 is the anode of the quantum dot light-emitting element and is configured to receive a second control voltage VDC2. For example, the quantum dot light-emitting element includes different quantum dots that emit light of different colors, and the different quantum dots that emit light of different colors correspond to different voltage differences applied between the first electrode and the second electrode of the quantum dot light-emitting element. For example, the control method of the pixel circuit includes: controlling the range of the voltage difference between the first electrode and the second electrode of the quantum dot light-emitting element to control the corresponding quantum dot to emit light of the corresponding color.

[0093] For example, the quantum dot light-emitting element includes a first quantum dot and a second quantum dot that respectively emit light of different colors. The control method includes: in a first time period, controlling the light-emitting diode element to emit light of a first color and controlling the first quantum dot to emit light of a second color; in a second time period, controlling the second quantum dot to emit light of a third color.

[0094] For example, the control method of the pixel circuit includes: writing a first data signal Data1 for controlling the grayscale of a first color and a second color in a first period; and writing a second data signal Data2 for controlling the grayscale of a third color in a second period.

[0095] 3 and 4 , the display process of the first period 1 includes a first data writing and resetting phase T11 and a first light emitting phase T12 . An operation process or control method of the pixel circuit includes the following steps. In the first data writing and resetting phase T11, the second control signal Gate2 (i.e., the second data scanning signal Gate2, referred to as the second control signal here and below for the sake of convenience) is a shutdown signal, the first control signal Gate1 (i.e., the first data scanning signal Gate1, referred to as the first control signal here and below for the sake of convenience) and the third control signal Gate3 (i.e., the first sensing scanning signal Gate3, referred to as the third control signal here and below for the sake of convenience) are both on signals, the first data writing transistor T1 and the first sensing transistor T3 are both turned on, the first data signal Data1 is transmitted to the gate of the first driving transistor T2 via the first data writing transistor T1, for example, through the analog-to-digital converter through the first sensing signal line SENSE1 and the first sensing transistor T3, the first reset signal Sense1 is written to the first electrode of the first light-emitting element EL1, for example, the first reset signal Sense1 is a voltage Vdc (e.g., a constant voltage), the first driving transistor T2 is turned on and generates a driving current to charge the first electrode of the first light-emitting element EL1 to the operating voltage. FIG5A is a schematic diagram of the circuit conduction state during the first period 1 shown in FIG4 . As shown in FIG5A , during the first light-emitting phase T12 , the second control signal Gate2 , the first control signal Gate1 , and the third control signal Gate3 are all off signals. Due to the bootstrap effect of the first storage capacitor C1 , the first drive transistor T2 remains on and operates in a saturated state with a constant current. At this time, the first control voltage VDC1 is controlled such that VN1 − VDC1 > VEL1 , thereby driving the first light-emitting element EL1 to emit light and generating a first drive current CR1 through the first drive transistor T2 and the first light-emitting element EL1 . The first dashed line and arrow in FIG5A represent the first drive current CR1 . Simultaneously, during the first light-emitting phase T12 , the second control voltage VDC2 is controlled such that VDC2 − VN1 > VEL2 , thereby driving the second light-emitting element EL2 to emit light and generating a second drive current CR2 through the first drive transistor T2 and the second light-emitting element EL2 . The second dashed line and arrow in FIG5A represent the second drive current CR2 . For example, the first light-emitting element EL1 emits light of a first color, and the second light-emitting element EL2 emits light of a second color. Thus, in the first light-emitting stage T12, the first light-emitting element EL1 and the second light-emitting element EL2 both emit light, for example, emit light simultaneously, and the light-emitting conditions of both are controlled by the first data signal Data1, that is, the grayscale of the first color and the grayscale of the second color are both controlled by the first data signal Data1.For example, in the first light-emitting stage T12, the second control voltage VDC2 is controlled to select the emission wavelength of the second light-emitting element EL2, i.e., the quantum dot light-emitting element. The voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled within a first range to control the first quantum dot to emit light of the second color. For example, in the first light-emitting stage T12, the wavelength of the second color of the quantum dot light-emitting element is turned on, so that the quantum dot light-emitting element emits light of the second color. For example, in the first light-emitting stage T12, the second color of the light is red.

[0096] In the second period 2 after the first period 1, the display process of the second period 2 includes a second data writing and reset phase T21 and a second light-emitting phase T22. A working process (control method) of the pixel circuit also includes the following steps. In the second data writing and reset phase T21, the first control signal Gate1 is an off signal, the second control signal Gate2 and the third control signal Gate3 are both on signals, the second data writing transistor T5 and the first sensing transistor T3 are both turned on, and the second data signal Data2 is transmitted to the gate of the second driving transistor T4 through the second data writing transistor T5, for example, through the analog-to-digital converter through the first sensing signal line SENSE1 and the first sensing transistor T3 to write a reset signal to the second electrode of the second light-emitting element EL2. During the second light-emitting phase T22, the first control signal Gate1, the second control signal Gate2, and the third control signal Gate3 are all off signals. Due to the bootstrap effect of the second storage capacitor C2, the second drive transistor T4 remains on, as shown in FIG5B . At this time, the second control voltage VDC2 is controlled so that VDC2 – VN1 > VEL2, thereby causing the second light-emitting element EL2 to emit light and generating a third drive current CR3 through the second drive transistor T4 and the second light-emitting element EL2. The dotted line and arrow in FIG5B represent the third drive current CR3. Thus, during the second period 2, the light emission of the second light-emitting element EL2 is controlled by the second data signal Data2, i.e., the grayscale of the third color is controlled by the second data signal Data2. During the second light-emitting stage T22, the second control voltage VDC2 is controlled to select the wavelength band of the second light-emitting element EL2, i.e., the quantum dot light-emitting element. The voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled within a second range to control the second quantum dot to emit light of a third color. For example, during the second light-emitting stage T22, the wavelength band of the third color of the quantum dot light-emitting element is turned on, causing it to emit light of the third color. For example, during the second light-emitting stage T22, the third color of light is green.

[0097] Thus, in the embodiment shown in Figures 3-4, a full-color display is achieved by dividing a frame of displayed image into a first time period 1 and a second time period 2. During the first time period 1, the first light-emitting element EL1 (OLED element) is controlled to emit light of a first color while the second light-emitting element EL2 (quantum dot light-emitting element) emits light of a second color. Furthermore, during the second time period 2, the second light-emitting element EL2 (quantum dot light-emitting element) is controlled to emit light of a third color, thereby achieving full-color display. Furthermore, in this embodiment, since a frame of displayed image only needs to be split into two parts, namely two stages (e.g., the first 1 / 2 frame and the second 1 / 2 frame), it is easier to achieve a high refresh rate and improve the display quality.

[0098] For example, the turn-on sequence of the first light emitting element EL1 and the second light emitting element EL2 can be swapped, that is, the light emitting sequence can be swapped, that is, the sequence of the first time period 1 and the second time period 2 can be interchanged.

[0099] Of course, in the above embodiment, the colors of the first color light, the second color light and the third color light are not limited to the colors listed above, and the types of these three colors can also be adjusted according to specific needs.

[0100] In the embodiment shown in Figures 3-4, for example, the first control voltage terminal and the second control voltage terminal are different voltage terminals, and the second control voltage VDC2 is different from the first control voltage VDC1, so that it is easier to obtain the above-mentioned voltage difference VDC2–VN1 in different ranges, that is, the first range and the second range that are different from each other.

[0101] In the embodiments shown in Figures 3-4, for example, the first electrode of the first light-emitting element EL1 and the second electrode of the second light-emitting element EL2 are electrically connected, that is, the first electrode of the OLED element is electrically connected to the second electrode of the quantum dot (QD) light-emitting element. For example, the first electrode of the OLED element is also reused as the second electrode of the quantum dot (QD) light-emitting element, that is, the first electrode of the OLED element and the second electrode of the quantum dot (QD) light-emitting element are an integrated structure.

[0102] Alternatively, in at least one embodiment, for the pixel circuit shown in FIG3 , the first light-emitting element EL1 is a quantum dot light-emitting element, and the second light-emitting element EL2 is a light-emitting diode element. In this case, the operating principle of the pixel circuit for achieving color display is similar to that of the embodiment shown in FIG3 . The structure and control method of the pixel circuit can refer to the previous description of the embodiment shown in FIG3-4 . The first light-emitting element EL1 and the second light-emitting element EL2 can be adaptively interchanged. The principles are the same and will not be further described here.

[0103] Alternatively, in at least one embodiment, for the pixel circuit shown in FIG3 , the first light-emitting element EL1 and the second light-emitting element EL2 are both quantum dot light-emitting elements. For example, the first light-emitting element EL1 and the second light-emitting element EL2 are quantum dot light-emitting elements including a first quantum dot, a second quantum dot, and a third quantum dot, and the first quantum dot, the second quantum dot, and the third quantum dot emit light of a first color, a second color, and a third color, respectively. In this case, the overall operation process or control method of the pixel circuit can refer to the above description of FIG4 , which also includes a first time period 1 and a second time period 2. However, the operation process of this pixel circuit differs from that of FIG4 in the following ways. For example, the first light-emitting element EL1 is a first quantum dot light-emitting element and includes a first quantum dot, and the second light-emitting element EL2 is a second quantum dot light-emitting element and includes a second quantum dot and a third quantum dot. In a first light-emitting phase T12, the first control voltage VDC1 is controlled to select the emission wavelength of the first light-emitting element EL1 (i.e., the first quantum dot light-emitting element) so that the first quantum dot of the first light-emitting element EL1 emits light of a first color. Simultaneously, during the first light-emitting phase T12, the second control voltage VDC2 is controlled to select the emission wavelength of the second light-emitting element EL2 (i.e., the second quantum dot light-emitting element) so that the second quantum dot of the second light-emitting element EL2 emits light of the first color. For example, the first color is blue light and the second color is red light. In a second light-emitting phase T22, the second control voltage VDC2 is controlled to select the emission wavelength of the second light-emitting element EL2 (i.e., the second quantum dot light-emitting element) so that the third quantum dot of the second light-emitting element EL2 emits light of a third color. For example, the third color is green light. The operations of the first data write and reset phase T11 of the first period 1 and the second data write and reset phase T21 of the second period 2 are the same as described previously with respect to FIG. 4 . In this manner, this embodiment can also achieve full-color display by dividing a frame of displayed image into a first period 1 and a second period 2, controlling the first light-emitting element EL1 to emit light of a first color and the second light-emitting element EL2 to emit light of a second color during the first period 1, and controlling the second light-emitting element EL2 to emit light of a third color during the second period 2. Furthermore, in this embodiment, since a frame of displayed image only needs to be split into two parts, namely two stages (e.g., the first 1 / 2 frame and the second 1 / 2 frame), it is easier to achieve a high refresh rate and improve the display effect.

[0104] For example, Figure 6 is a timing diagram of another control method of the pixel circuit shown in Figure 3; Figure 7A is a schematic diagram of the circuit conduction state of the first time period 1 shown in Figure 6; Figure 7B is a schematic diagram of the circuit conduction state of the second time period 2 shown in Figure 6; Figure 7C is a schematic diagram of the circuit conduction state of the third time period 3 shown in Figure 6.

[0105] For example, at least two light-emitting periods also include a third period; the control method of the pixel circuit includes: in the first period, controlling the light-emitting diode element to emit light of a first color; in the second period, controlling the first quantum dot to emit light of a second color; and in the third period, controlling the second quantum dot to emit light of a third color.

[0106] For example, in the embodiments shown in Figures 6 and 7A-7C, the control method of the pixel circuit includes: writing a first data signal Data1 for controlling the grayscale of a first color in a first time period; and writing a second data signal Data2 for controlling the grayscale of a second color and a third color in a second time period and a third time period, respectively.

[0107] For example, referring to FIG6 , a frame of image includes a first period 1, a second period 2, and a third period 3. For example, a frame of image is divided into three periods: the first period 1, the second period 2, and the third period 3. For example, here, the first period 1 is the first 1 / 3 frame, the second period 2 is the second 1 / 3 frame, and the third period 3 is the third 1 / 3 frame. In this case, the luminous duration of each color is basically the same, which is conducive to obtaining a better color display effect and reducing the difficulty of control. Of course, this is not limited to this case, and the durations of the first period 1, the second period 2, and the third period 3 can also be unequal.

[0108] In the embodiments shown in Figures 6 and 7A-7C, one of the first light-emitting element EL1 and the second light-emitting element EL2 is a light-emitting diode element (OLED element), and the other is a quantum dot (QD) light-emitting element. The quantum dot light-emitting element includes first and second quantum dots that emit light of different colors, respectively. The following description uses the example of the first light-emitting element EL1 being an OLED element and the second light-emitting element EL2 being a quantum dot light-emitting element.

[0109] Specifically, referring to FIGS. 3 and 6, the display process of the first period 1 includes a first data writing and resetting stage T11 and a first light emitting stage T12. A working process or control method of this pixel circuit includes the following steps. In the first data writing and resetting stage T11, the second control signal Gate2 (i.e., the second data scan signal Gate2, which is referred to as the second control signal for convenience of description here and hereinafter) is a turn-off signal, and the first control signal Gate1 (i.e., the first data scan signal Gate1, which is referred to as the first control signal for convenience of description here and hereinafter) and the third control signal Gate3 (i.e., the first sensing scan signal Gate3, which is referred to as the third control signal for convenience of description here and hereinafter) are both turn-on signals. The first data writing transistor T1 and the first sensing transistor T3 are both turned on. The first data signal Data1 is transmitted through the first data writing transistor T1 to the gate of the first driving transistor T2. For example, a first reset signal Sense1 is written to the first electrode of the first light emitting element EL1 through the first sensing signal line SENSE1 and the first sensing transistor T3 by an analog-to-digital converter. The first driving transistor T2 is turned on and generates a driving current to charge the first electrode of the first light emitting element EL1 to the operating voltage. FIG. 7A is a schematic diagram of the circuit conduction state of the first period 1 shown in FIG. 4. As shown in FIG. 7A, in the first light emitting stage T12, the second control signal Gate2, the first control signal Gate1, and the third control signal Gate3 are all turn-off signals. Due to the bootstrap effect of the first storage capacitor C1, the first driving transistor T2 remains turned on and operates in the saturation state with a constant current. At this time, the first control voltage VDC1 is controlled such that VN1 - VDC1 > VEL1, thereby driving the first light emitting element EL1 to emit light and generating a first driving current CR1 passing through the first driving transistor T2 and the first light emitting element EL1. The dotted line and arrow in FIG. 7A represent the first driving current CR1. At the same time, in the first light emitting stage T12, the second control voltage VDC2 is controlled such that VDC2 – VN1 < VEL2, thereby preventing the second light emitting element EL2 from emitting light. Thus, in the first light emitting stage T12, only the first light emitting element EL1 emits light. For example, the first light emitting element EL1 emits light of the first color. The light emission condition of the first light emitting element EL1 is controlled by the first data signal Data1, that is, the gray scale of the first color is controlled by the first data signal Data1.

[0110] In the second period 2 after the first period 1, the display process of the second period 2 includes a second data writing and reset phase T21 and a second light-emitting phase T22. A working process (control method) of the pixel circuit also includes the following steps. In the second data writing and reset phase T21, the first control signal Gate1 is an off signal, the second control signal Gate2 and the third control signal Gate3 are both on signals, the second data writing transistor T5 and the first sensing transistor T3 are both turned on, and the second data signal Data2 is transmitted to the gate of the second driving transistor T4 through the second data writing transistor T5, for example, through the analog-to-digital converter through the first sensing signal line SENSE1 and the first sensing transistor T3 to write the first reset signal Sense1 to the second electrode of the second light-emitting element EL2. During the second light-emitting phase T22, the first control signal Gate1, the second control signal Gate2, and the third control signal Gate3 are all off signals. Due to the bootstrap effect of the second storage capacitor C2, the second driving transistor T4 remains on, as shown in FIG7B . At this time, the second control voltage VDC2 is controlled so that VDC2 – VN1 > VEL2, thereby causing the second light-emitting element EL2 to emit light and generating a second driving current CR2 through the second driving transistor T4 and the second light-emitting element EL2. The dotted line and arrow in FIG7B represent the second driving current CR2. For example, during the second light-emitting phase T22, the second light-emitting element EL2 emits light of a second color, which is different from the first color. Thus, during the second period 2, the light emission of the second light-emitting element EL2 is controlled by the second data signal Data2, i.e., the grayscale of the second color is controlled by the second data signal Data2. In the second light-emitting stage T22, the second control voltage VDC2 is controlled to select the emission wavelength of the second light-emitting element EL2, i.e., the quantum dot light-emitting element. The voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled within a second range to control the second quantum dot to emit light of a second color. For example, in the second light-emitting stage T22, the wavelength of the second color of light of the quantum dot light-emitting element is turned on, so that the quantum dot light-emitting element emits light of the second color. For example, in the second light-emitting stage T22, the second color of light is red.

[0111] In the third period 3 after the second period 2, the display process of the third period 3 includes a third data writing and reset phase T31 and a third light-emitting phase T32. A working process (control method) of the pixel circuit also includes the following steps. In the third data writing and reset phase T31, the first control signal Gate1 is a closed signal, the second control signal Gate2 and the third control signal Gate3 are both open signals, the second data writing transistor T5 and the first sensing transistor T3 are both turned on, and the second data signal Data2 is transmitted to the gate of the second driving transistor T4 through the second data writing transistor T5, for example, through the analog-to-digital converter through the first sensing signal line SENSE1 and the first sensing transistor T3 to write the first reset signal Sense1 to the second electrode of the second light-emitting element EL2. During the third light-emitting stage T32, the first control signal Gate1, the second control signal Gate2, and the third control signal Gate3 are all off signals. Due to the bootstrap effect of the second storage capacitor C2, the second driving transistor T4 remains on, as shown in FIG7B . At this time, the second control voltage VDC2 is controlled so that VDC2 – VN1 > VEL2, thereby causing the second light-emitting element EL2 to emit light and generating a third driving current CR3 through the second driving transistor T4 and the second light-emitting element EL2. The dotted line and arrow in FIG7C represent the third driving current CR3. For example, during the third light-emitting stage T32, the second light-emitting element EL2 emits light of a third color, which is different from both the first and second colors. Thus, during the third period 3, the light emission of the second light-emitting element EL2 is also controlled by the second data signal Data2, i.e., the grayscale of the third color is also controlled by the second data signal Data2. In the third light-emitting stage T32, the second control voltage VDC2 is controlled to select the emission wavelength of the second light-emitting element EL2, i.e., the quantum dot light-emitting element. The voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled within a third range to control the second quantum dot to emit light of a third color. For example, in the third light-emitting stage T32, the wavelength of the third color of the quantum dot light-emitting element is turned on, causing it to emit light of the third color. For example, in the third light-emitting stage T32, the third color of light is green.

[0112] In the process shown in FIG6 , during the period when the first light-emitting element EL1 emits light, the circuit on the left works (i.e., the first light-emitting element EL1 is driven to emit light by the first driving transistor T2). When the first data signal Data1 is written, the voltage of the first node N1 is the voltage Vdc. When the first light-emitting element EL1 emits light and is turned on, the voltage of the first node N1 is greater than Vdc, and the second light-emitting element EL2 is reverse-biased, thereby ensuring that the second light-emitting element EL2 does not emit light. During the period when the second light-emitting element EL2 is driven to emit light, the voltage of the first node N1 is the voltage Vdc when the second data signal Data2 is written. When the second light-emitting element EL2 emits light and is turned on, the voltage of the first node N1 is less than Vdc, thereby Ensure that the first light-emitting element EL1 is reverse biased and that the first light-emitting element EL1 does not emit light. Therefore, in the embodiments shown in Figures 3 and 6, by dividing a frame of display image into a first time period 1, a second time period 2, and a third time period 3, the first light-emitting element EL1 (OLED element) is made to emit light of a first color in the first time period 1, the second light-emitting element EL2 (quantum dot light-emitting element) is made to emit light of a second color in the second time period 2, and the second light-emitting element EL2 (quantum dot light-emitting element) is made to emit light of a third color in the third time period 3. In the process of controlling the pixel circuit to display, the two light-emitting elements emit light of three colors without interfering with each other, thereby achieving full-color display.

[0113] In this embodiment, on the one hand, a frame of display image is divided into three time periods, and only one light-emitting element is controlled to emit light in each time period. It is not necessary to simultaneously satisfy VDC2–VN1>VEL1 and VDC2–VN1>VEL2, which makes it easier to implement and reduces the implementation difficulty. On the other hand, the OLED element and the quantum dot light-emitting element are of different types and the light-emitting control of the two is achieved by controlling the first control voltage VDC1 and the second control voltage VDC2 respectively. Therefore, the light-emitting control of the two is relatively independent, which not only reduces the implementation difficulty, but also facilitates the expansion of the range of the voltage difference VDC2–VN1 between the first electrode and the second electrode of the quantum dot light-emitting element and the range of the voltage difference VN1-VDC1 between the first electrode and the second electrode of the OLED element, thereby making the quantum dot light-emitting element able to emit a wider range of color light bands and broadening the brightness range of the OLED element and the quantum dot light-emitting element, so that the display substrate can meet higher display requirements.

[0114] Similarly, for example, the opening order of the first light-emitting element EL1 and the second light-emitting element EL2 can be interchanged, that is, the light-emitting order can be interchanged, that is, the order of the first time period 1, the second time period 2 and the third time period can be arbitrary and is not limited to the situation shown in the figure. The situation shown in the figure has low control difficulty and can be used as a preferred embodiment.

[0115] For example, in the pixel circuits and control methods thereof shown in Figures 3 and 6, the first control voltage terminal and the second control voltage terminal can be the same control voltage terminal, that is, the second control voltage VDC2 and the first control voltage VDC1 can be the same voltage signal. Because the time period for adjusting the voltage difference between the first and second electrodes of the quantum dot light-emitting element (VDC2-VN1) and the time period for adjusting the voltage difference between the first and second electrodes of the OLED element (VN1-VDC1) are different and independent time periods, the aforementioned requirements for both voltage differences can be achieved using the same control voltage terminal, thereby simplifying the structure of the pixel circuit and simplifying the control method.

[0116] Likewise, in the embodiments shown in FIG. 3 and FIG. 6 , the colors of the first color light, the second color light, and the third color light are not limited to the colors listed above, and the types of these three colors may be adjusted according to specific needs.

[0117] For example, in at least one other embodiment, for the pixel circuit shown in FIG3 , the first light-emitting element EL1 and the second light-emitting element EL2 may both be quantum dot light-emitting elements, and the two quantum dot light-emitting elements may include a first quantum dot, a second quantum dot, and a third quantum dot. In this case, the at least two light-emitting periods of the control method of the pixel circuit may also include a first period, a second period, and a third period. The control method of the pixel circuit differs from the control method shown in FIG6 in the following ways.

[0118] For example, if both the first light-emitting element EL1 and the second light-emitting element EL2 are quantum dot light-emitting elements, the pixel circuit control method includes: controlling the first quantum dot to emit light of a first color during a first time period; controlling the second quantum dot to emit light of a second color during a second time period; and controlling the third quantum dot to emit light of a third color during a third time period. For example, the first of the first light-emitting element EL1 and the second light-emitting element EL2 includes a first quantum dot, and the second of the first light-emitting element EL1 and the second light-emitting element EL2 includes a second quantum dot and a third quantum dot. The pixel circuit control method includes: controlling the first of the first light-emitting element EL1 and the second light-emitting element EL2 to emit light of the first color during one of the first, second, and third time periods, i.e., causing the first quantum dot to emit light of the first color; and controlling the second of the first light-emitting element EL1 and the second light-emitting element EL2 to emit light of a second color and a third color, respectively, during the other two of the first, second, and third time periods, i.e., causing the second quantum dot and the third quantum dot to emit light of the second color and a third color, respectively, where the first, second, and third colors are different from each other, thereby achieving full-color display.

[0119] For example, in one of the above-mentioned first, second and third time periods, the luminescence condition of the first quantum dot (that is, the grayscale of the first color) is controlled by one of the first data signal Data1 and the second data signal Data2; in the other two of the above-mentioned first, second and third time periods, the luminescence conditions of the second quantum dot and the third quantum dot (that is, the grayscale of the second color and the grayscale of the third color) are both controlled by the other of the first data signal Data1 and the second data signal Data2.

[0120] Exemplarily, for example, the working timing of the pixel circuit of this embodiment is the same as that shown in Figure 6. Referring to Figure 6, in the first time period 1, the first quantum dot of the first light-emitting element EL is controlled to emit light of the first color, and the light emission of the first quantum dot is controlled by the first data signal Data1; in the second time period 2, the second quantum dot of the second light-emitting element EL2 is controlled to emit light of the second color, and the light emission of the second quantum dot is controlled by the second data signal Data2; in the second time period 2, the second quantum dot of the second light-emitting element EL2 is controlled to emit light of the second color, and the light emission of the second quantum dot is controlled by the second data signal Data2.

[0121] Figure 8 is a schematic diagram of another pixel circuit provided by an embodiment of the present disclosure. The structure of the pixel circuit shown in Figure 8 is different from that shown in Figure 3 as follows. As shown in Figure 8, the second end of the second storage sub-circuit 3B is electrically connected to the first node N1. In this case, the gate of the second driving transistor T4 is electrically connected to the first electrode of the second storage capacitor C2, the first electrode of the second driving transistor T4 is configured to receive the second power supply voltage VSS, the second electrode of the second driving transistor T4 is electrically connected to the first node N1, and the second electrode of the second storage capacitor C2 is electrically connected to the first node N1. Similarly, in this pixel circuit, the first data signal Data1 is stored in the first storage capacitor C1, and the second data signal Data2 is stored in the second storage capacitor C2. The pixel circuit shown in Figure 8 can achieve the same or similar technical effects as the pixel circuit shown in Figure 3. Its working process or control method can refer to the description of the pixel circuit shown in Figure 3, which will not be repeated here.

[0122] The following describes the detection and compensation process of the pixel circuit provided by at least one embodiment of the present disclosure.

[0123] FIG9A is a schematic diagram of a pixel circuit connected to a first external detection circuit OC provided by an embodiment of the present disclosure, showing that the pixel circuit shown in FIG3 is electrically connected to the first external detection circuit OC. Referring to FIG9A , the first sensing signal line SENSE1 is electrically connected to the first external detection circuit OC, and the first sensing sub-circuit 4A is configured to detect the electrical characteristics of the pixel circuit of the sub-pixel to which it belongs through the first external detection circuit OC in response to the first sensing scan signal Gate3 to achieve external compensation. The electrical characteristics may include, for example, the threshold voltage and / or carrier mobility of the driving transistor, and may also include parameters that affect the light-emitting result of the light-emitting element due to aging of the light-emitting element. For example, the parameters that affect the light-emitting result of the light-emitting element due to aging of the light-emitting element may be the gate-source voltage Vgs of the driving transistor, or the driving current flowing through the light-emitting element. The driving transistors described herein include the first driving transistor T2 and / or the second driving transistor T4, and the light-emitting elements include the first light-emitting element EL1 and / or the second light-emitting element EL2.

[0124] In this way, the control method of the pixel circuit provided by at least one embodiment of the present disclosure also includes: detecting the electrical characteristics of the sub-pixel where the pixel circuit is located, and compensating the pixel circuit according to the electrical characteristics of the sub-pixel, wherein the electrical characteristics include at least one of the aging degree of the first light-emitting element and / or the second light-emitting element, the threshold voltage of the first driving transistor and / or the second driving transistor, and the carrier mobility; the aging degree of the first light-emitting element and / or the second light-emitting element includes parameters that affect the light-emitting results of the first light-emitting element and / or the second light-emitting element due to the aging of the first light-emitting element and / or the second light-emitting element, and the parameters include at least one of the gate-source voltage Vgs of the first driving transistor and / or the gate-source voltage Vgs of the second driving transistor, and the driving current flowing through the first light-emitting element and / or the second light-emitting element.

[0125] Here, detecting the threshold voltage and / or carrier mobility of the driving transistor and / or the gate-source voltage Vgs of the driving transistor that affects the light-emitting result of the light-emitting element due to aging of the light-emitting element is called "voltage sensing", and detecting the driving current flowing through the light-emitting element that affects the light-emitting result of the light-emitting element due to aging of the light-emitting element is called "current sensing".

[0126] For example, in the control method of the pixel circuit provided in the embodiment of the present disclosure, the step of "detecting the electrical characteristics of the sub-pixel where the pixel circuit is located, and compensating the pixel circuit according to the electrical characteristics of the sub-pixel" includes at least two compensation periods, and the control method of the pixel circuit includes: in each compensation period, for the first light-emitting element and / or the second light-emitting element that emits light, the electrical characteristics of the pixel circuit that drives the first light-emitting element and / or the second light-emitting element to emit light are detected, and the pixel circuit is compensated according to the electrical characteristics of the sub-pixel; for example, the detected electrical characteristics are converted into a digital signal, for example, according to the digital signal, the aging of the light-emitting element whose grayscale is controlled by the corresponding data signal is compensated through the first data signal Data1 or the second data signal Data2.

[0127] For example, the control method of the above-mentioned pixel circuit includes: in a first time period, writing a first data signal Data1 for controlling the grayscale of the first color and the grayscale of the second color; and in a second time period, writing a second data signal Data2 for controlling the grayscale of the third color. In the first light-emitting stage, the first light-emitting element EL1 emits light of the first color while the second light-emitting element EL2 emits light of the second color, and the light-emitting conditions of both are controlled by the first data signal Data1. In the second light-emitting stage, the second light-emitting element EL2 emits light of the third color, and the light-emitting condition of the second light-emitting element EL2 is controlled by the second data signal Data2. For example, at least two compensation periods include a first compensation period and a second compensation period. During the first compensation period, the electrical characteristics of the pixel circuits driving the first light-emitting element EL1 (OLED element) emitting light of the first color and the second light-emitting element EL2 (quantum dot light-emitting element) emitting light of the second color are detected respectively, and the detected electrical characteristics are converted into digital signals respectively. For example, according to the digital signal, the light-emitting conditions of the OLED element and the quantum dot light-emitting element are simultaneously compensated through the first data signal Data1, including simultaneous compensation for the aging conditions of the OLED element and the quantum dot light-emitting element, and may also include compensation for the threshold voltage of the first driving transistor T1; the electrical characteristics of the pixel circuit driving the first light-emitting element EL1 emitting light of the first color may include the threshold voltage of the first driving transistor T2 The threshold voltage and / or carrier mobility, and a parameter that affects the light-emitting result of the first light-emitting element EL1 due to aging of the first light-emitting element EL1, for example, the parameter can be the gate-source voltage Vgs1 of the first driving transistor T2, or the driving current flowing through the first light-emitting element EL1; the electrical characteristics of the pixel circuit that drives the second light-emitting element EL2 to emit light of the second color may include the threshold voltage and / or carrier mobility of the first driving transistor T2, and a parameter that affects the light-emitting result of the second light-emitting element EL2 due to aging of the second light-emitting element EL2, for example, the parameter can be the gate-source voltage Vgs1 of the first driving transistor T2, or the driving current flowing through the second light-emitting element EL2.During the second compensation period, the electrical characteristics of the pixel circuit that drives the second light-emitting element EL2 (quantum dot light-emitting element) that emits light of the third color are detected, and the detected electrical characteristics are converted into digital signals. For example, the light-emitting condition of the quantum dot light-emitting element is compensated through the second data signal Data2 according to the digital signal, including compensation for the aging of the quantum dot light-emitting element, and may also include compensation for the threshold voltage of the second driving transistor T2; the electrical characteristics of the pixel circuit that drives the second light-emitting element EL2 that emits light of the third color may include the threshold voltage and / or carrier mobility of the second driving transistor T4, and parameters that affect the light-emitting result of the second light-emitting element EL2 due to the aging of the second light-emitting element EL2. For example, the parameter may be the gate-source voltage Vgs2 of the second driving transistor T4, or the driving current flowing through the second light-emitting element EL2.

[0128] In other embodiments of the present disclosure, for example, in the case where a frame of image shown in FIG. 6 includes a first period 1, a second period 2, and a third period 3, at least two compensation periods include a first compensation period, a second compensation period, and a third compensation period, and the method for controlling the pixel circuit includes: in the first compensation period, detecting electrical characteristics of the pixel circuit that drives the first light-emitting element to emit light of the first color, and converting the detected electrical characteristics into a digital signal, and compensating for the light emission of the first light-emitting element through a first data signal according to the digital signal, wherein the electrical characteristics may include a threshold voltage and / or carrier mobility of the first driving transistor T2, and a parameter that affects the light emission result of the first light-emitting element EL1 due to aging of the first light-emitting element EL1, for example, the parameter may be a gate-source voltage Vgs1 of the first driving transistor T2, or a driving current flowing through the first light-emitting element EL1; in the second compensation period, detecting electrical characteristics of the pixel circuit that drives the second light-emitting element to emit light of the second color, and converting the detected electrical characteristics into a digital signal. a digital signal, compensating for the luminescence of the second light-emitting element using the second data signal according to the digital signal, wherein the electrical characteristic may include a threshold voltage and / or carrier mobility of the second driving transistor T4, and a parameter affecting the luminescence result of the second light-emitting element EL2 due to aging of the second light-emitting element EL2, for example, the parameter may be a gate-source voltage Vgs2 of the second driving transistor T4, or a driving current flowing through the second light-emitting element EL2; and, in a third compensation period, detecting an electrical characteristic of a pixel circuit that drives the second light-emitting element to emit light of the third color, converting the detected electrical characteristic into a digital signal, and compensating for the luminescence of the second light-emitting element using the second data signal according to the digital signal, wherein the electrical characteristic may include a threshold voltage and / or carrier mobility of the second driving transistor T4, and a parameter affecting the luminescence result of the second light-emitting element EL2 due to aging of the second light-emitting element EL2, for example, the parameter may be a gate-source voltage Vgs2 of the second driving transistor T4, or a driving current flowing through the second light-emitting element EL2.

[0129] Specifically, for example, FIG9B is an example of the pixel circuit shown in FIG9A connected to the first external detection circuit, and FIG10 is a timing diagram of the compensation process of the pixel circuit shown in FIG9A.

[0130] Referring to Figures 9B and 10 , for example, the compensation process for the pixel circuit shown in Figure 9B includes a first compensation period 1, a second compensation period 2, and a third compensation period 3. During these three compensation periods, compensation is performed on light-emitting elements emitting three different colors of light. For example, the first light-emitting element EL1 is an OLED element, and the second light-emitting element EL2 is a quantum dot element. The quantum dot element includes first and second quantum dots that can be excited to emit different colors of light. The following describes the detection and compensation method for this pixel circuit using this example. Figures 9B and 10 illustrate current sensing for both the OLED and quantum dot elements. During current sensing, the first control signal Gate1 and the third control signal Gate3 can be simultaneously on or off during each period. Therefore, the first and third control signals Gate1 and Gate3 can originate from the same control signal terminal, allowing them to be provided via the same signal line. This saves a scanning signal line, and therefore a gate line, simplifying the display substrate structure and reducing the manufacturing and control difficulties of the display substrate.

[0131] In other embodiments, during the detection and compensation phase, voltage sensing may be performed on the OLED element and current sensing may be performed on the quantum dot light-emitting element, so as to select a sensing method suitable for each light-emitting element according to the type and characteristics of the light-emitting element.

[0132] For example, the detection phase shown in FIG. 10 may be performed during a blanking phase between display phases, or during power-off time to avoid affecting the display.

[0133] 9B and 10 , in the first compensation period 1, the light emission of the first light-emitting element EL1 is compensated. First, in the first sub-period T11 of the first compensation period 1, the first control signal Gate1 and the third control signal Gate3 are both on signals, and the second control signal Gate2 is a off signal, so that the first data transistor T1 and the first sensing transistor T3 are both turned on, and the first data signal Data1 is written to the gate of the first driving transistor T2. For example, the first data signal Data1 is a Vdata signal. At the same time, the first external detection circuit OC is used to write the first reset signal Sense1 to the first node N1 through the first sensing signal line SENSE1 and the first sensing transistor T3. For example, the first reset signal Sense1 is a Vdc signal. Then, in the second sub-period T12 of the first compensation period 1, the first control signal Gate1 is turned on. and the second control signal Gate2 are both off signals, the third control signal Gate3 remains as an on signal, the first driving transistor T2 is turned on, and the first power supply voltage VDD is used to charge the first node N1. The third control signal Gate3 remains as an on signal, and its AC part flows to the first sensing signal line SENSE1. After a certain time, in the first sensing period TS1 of the second sub-period T12, the driving current flowing through the OLED element is sensed through the first external detection circuit OC and the first sensing signal line SENSE1, and the detected driving current is converted into a digital signal. According to the digital signal, the aging of the OLED element is compensated through the first data signal Data1; in the third sub-period T13 of the first compensation period 1, the first control signal Gate1, the second control signal Gate2 and the third control signal Gate3 are all off signals.

[0134] For example, in the first compensation period 1, the conduction time of the OLED element is longer than the conduction time of the OLED element during actual operation, so that it has enough light emission time, thereby making the aging degree of the detected OLED element (ie, the first light emitting element EL1) accurate.

[0135] For example, the compensation of the quantum dot light emitting element (ie, the second light emitting element EL2 ) is performed in two time periods, namely, in the second time period 2 and the third time period 3 .

[0136] 9B and 10 , in the second compensation period 2, the luminescence of the second light-emitting element EL2 emitting light of the second color is compensated. First, in the first sub-period T21 of the second compensation period 2, the second control signal Gate2 and the third control signal Gate3 are both on signals, and the first control signal Gate1 is a off signal, so that the second data transistor T5 and the first sensing transistor T3 are both turned on, and the second data signal Data2 is written into the gate of the second driving transistor T4. For example, the second data transistor T5 is a Vdata2 signal, for example, the Vdata2 signal is different from the Vdata1 signal here. At the same time, the first external detection circuit OC is used to write the first reset signal Sense1 to the first node N1 through the first sensing signal line SENSE1 and the first sensing transistor T3. For example, the first reset signal Sense1 is a Vdc signal. Then, in the second sub-period T22 of the second compensation period 2, the first The control signal Gate1 and the second control signal Gate2 are both off signals, the third control signal Gate3 remains as an on signal, the second driving transistor T4 is turned on, and the first node N1 is charged using the second power supply voltage VSS. The third control signal Gate3 remains as an on signal, and its AC part flows to the first sensing signal line SENSE1. After a certain time, in the second sensing period TS2 of the second sub-period T22, the driving current flowing through the quantum dot light-emitting element (i.e., the second light-emitting element EL2) is sensed through the first external detection circuit OC and the first sensing signal line SENSE1, and the detected driving current is converted into a digital signal, and the aging of the quantum dot light-emitting element is compensated for through the second data signal Data2 according to the digital signal; in the third sub-period T23 of the second compensation period 2, the first control signal Gate1, the second control signal Gate2 and the third control signal Gate3 are all off signals.

[0137] 9B and 10 , similar to the second compensation period 2, in the third compensation period 3, the light emission of the second light-emitting element EL2 emitting light of the third color is compensated. First, in the first sub-period T31 of the third compensation period 3, the second control signal Gate2 and the third control signal Gate3 are both on signals, and the first control signal Gate1 is an off signal, so that the second data transistor T5 and the first sensing transistor T3 are both turned on, and the second data signal Data2 is written to the gate of the second driving transistor T4. For example, the second data transistor T5 is a Vdata3 signal, for example, where the Vdata3 signal is different from both the Vdata1 signal and the Vdata2 signal. At the same time, the first external detection circuit OC is used to write the first reset signal Sense1 to the first node N1 via the first sensing signal line SENSE1 and the first sensing transistor T3. For example, the first reset signal Sense1 is a Vdc signal. Then, in the second sub-period T32 of the third compensation period 3, the first control signal Gate1 and the second control signal Gate2 are both off signals, the third control signal Gate3 remains on signal, and the second driving transistor T4 is turned on. The first node N1 is charged by the second power supply voltage VSS, and the third control signal Gate3 is maintained as an on signal, and its AC part flows to the first sensing signal line SENSE1. After a certain time, in the third sensing period TS3 of the third sub-period T32, the driving current flowing through the quantum dot light-emitting element (i.e., the second light-emitting element EL2) is sensed through the first external detection circuit OC and the first sensing signal line SENSE1, and the detected driving current is converted into a digital signal, and the aging of the quantum dot light-emitting element is compensated for through the second data signal Data2 according to the digital signal; in the third sub-period T33 of the third compensation period 3, the first control signal Gate1, the second control signal Gate2 and the third control signal Gate3 are all off signals.

[0138] In each compensation period, the aging compensation for the first light-emitting element EL1 and the second light-emitting element EL2 can also adopt the time accumulation method, that is, the aging curve simulation is performed by multiplying the opening time of each light-emitting element by the brightness, and grayscale compensation is performed according to the simulation curve. This will not be described in detail. The specific method of calculating the aging compensation for the first light-emitting element EL1 or the second light-emitting element EL2 in each step can be completed by referring to the existing technology.

[0139] For example, in the first compensation period 1 , the second compensation period 2 , and the third compensation period 3 , the first control voltage VDC1 and the second control voltage VDC2 are both VDC signals.

[0140] It should be noted that the embodiments shown in Figures 9B and 10 take current sensing as an example to introduce the detection and compensation method of the pixel circuit provided by the embodiment of the present disclosure, such as the pixel circuit shown in Figure 3. However, in other embodiments, the pixel circuit can also be detected and compensated by using a voltage sensing method. Similarly, it is also divided into at least two compensation periods corresponding to the display period. For example, when voltage sensing is performed, it also includes a first compensation period, a second compensation period and a third compensation period. The difference between this situation and the detection and compensation of the embodiments shown in Figures 9B and 10 above is that, in each compensation period, the threshold voltage or carrier mobility of the driving transistor turned on in the corresponding light-emitting stage is detected accordingly, and the pixel circuit that drives the light-emitting element to emit light in the corresponding display period is compensated according to the threshold voltage or carrier mobility through the corresponding data signal for controlling the display grayscale; or, the difference between this situation and the detection and compensation of the embodiments shown in Figures 9B and 10 above is that, in each compensation period, the gate-source voltage Vgs of the driving transistor that affects the light-emitting result of the light-emitting element due to aging of the corresponding light-emitting element is detected, and the pixel circuit that drives the light-emitting element to emit light in the corresponding display period is compensated according to the gate-source voltage Vgs through the corresponding data signal for controlling the display grayscale.

[0141] It should be noted that, regardless of whether voltage sensing or current sensing is used, for the supplement of the pixel circuit disclosed in the present invention, for each compensation stage, compensation can be performed simultaneously based on the threshold voltage or carrier mobility of the driving transistor that drives the corresponding light-emitting element to emit light and based on the aging of the light-emitting element, or only one of the supplementary methods can be selected for compensation. As long as it is divided into at least two corresponding stages, it complies with the principles of the detection and compensation method of the pixel circuit provided in the above-mentioned embodiment of the present invention.

[0142] FIG11 is a schematic diagram of another pixel circuit provided by an embodiment of the present disclosure, and FIG12 is a timing diagram of a control method of the pixel circuit shown in FIG11 . The pixel circuit shown in FIG11 has the following differences from that shown in FIG3 . Referring to FIG11 , for example, the pixel circuit further includes a second sensing subcircuit 4B and a second sensing signal line SENSE2. The first end of the second sensing subcircuit 4B is electrically connected to the first node N1, the control end of the second sensing subcircuit 4B is configured to receive a second sensing scan signal Gate4, the second end of the first sensing subcircuit 4A is electrically connected to the second sensing signal line SENSE2, and the second sensing signal line SENSE2 is electrically connected to a second external detection circuit (not shown in the figure), for example, the second external detection circuit is similar in structure and function to the first external detection circuit; the second sensing subcircuit 4B is configured to detect the electrical characteristics of the pixel circuit of the sub-pixel to which it belongs through the second external detection circuit in response to the second sensing scan signal Gate4 to achieve external compensation.

[0143] Referring to Figure 11, for example, the second sensing sub-circuit 4B includes a second sensing transistor T6, a first electrode of the second sensing transistor T6 is electrically connected to the first node N1, a second electrode of the second sensing transistor T6 is electrically connected to the second sensing signal line SENSE2 to be connected to the second external detection circuit, and a gate of the second sensing transistor T6 is configured to receive a second sensing scan signal Gate4. The second sensing transistor T6 is configured to detect the electrical characteristics of the pixel circuit of the sub-pixel to which it belongs through the second external detection circuit in response to the second sensing scan signal Gate4 to achieve external compensation.

[0144] A first electrode of the second sensing transistor T6 is electrically connected to the first node, a second electrode of the second sensing transistor T6 is electrically connected to the second sensing signal line SENSE2 to be connected to a second external detection circuit, a gate of the second sensing transistor T6 is configured to receive a second sensing scan signal Gate4, and the second sensing transistor T6 is configured to detect the electrical characteristics of the sub-pixel to which it belongs through the second external detection circuit in response to the second sensing scan signal Gate4 to achieve external compensation.

[0145] The working process (or control method) of the pixel circuit shown in Figure 12 is the same as that shown in Figure 6. The control method of the pixel circuit also includes: writing a first data signal Data1 for controlling the grayscale of the first color in the first time period 1; and writing a second data signal Data2 for controlling the grayscale of the second color and the third color in the second time period 2 and the third time period 3, respectively; that is, a frame of image includes a first time period 1, a second time period 2 and a third time period 3. For example, a frame of image is divided into three time periods: the first time period 1, the second time period 2 and the third time period 3; for example, the first time period 1 is the first 1 / 3 frame, the second time period 2 is the second 1 / 3 frame, and the third time period 3 is the third 1 / 3 frame. The working process in the first time period 1 is the same as the working process in the first time period shown in Figure 6, and reference may be made to the previous description. However, the working process of the pixel circuit shown in Figure 12 has the following differences from that shown in Figure 6.

[0146] In the embodiments shown in Figures 11 and 12, the reset in the second period 2 and the third period 3 is achieved through the first sensing sub-circuit 4A and the first sensing signal line SENSE1, and the reset in the second period 2 and the third period 3 is achieved through the second sensing sub-circuit 4B and the second sensing signal line SENSE2, rather than through the first sensing sub-circuit 4A and the first sensing signal line SENSE1.

[0147] Specifically, referring to Figures 11 and 12, in the first period 1, the second sensing scan signal Gate4 (that is, the fourth control signal Gate4, here and hereinafter referred to as the second sensing scan signal Gate4 is the fourth control signal Gate4) remains off; in the second period 2 and the third period 3, the third control signal Gate3 remains off.

[0148] 11 and 12 , the display process of the second period 2 includes a second data writing and resetting phase T21 and a second light-emitting phase T22. During the second data writing and resetting phase T21, the first control signal Gate1 is an off signal, the second control signal Gate2 and the fourth control signal Gate4 are both on signals, the second data writing transistor T5 and the second sensing transistor T6 are both turned on, and the second data signal Data2 is transmitted to the gate of the second driving transistor T4 via the second data writing transistor T5. For example, the first reset signal Sense1 is written to the second electrode of the second light-emitting element EL2 via the second sensing signal line SENSE2 and the second sensing transistor T6 by the second external detection circuit. During the second light-emitting phase T22, the first control signal Gate1, the second control signal Gate2, and the fourth control signal Gate4 are all off signals. Due to the bootstrap effect of the second storage capacitor C2, the second driving transistor T4 remains on. At this time, the second control voltage VDC2 is controlled so that VDC2 – VN1 > VEL2, thereby causing the second light-emitting element EL2 to emit light and generating a second driving current through the second driving transistor T4 and the second light-emitting element EL2. For example, during the second light-emitting phase T22, the second light-emitting element EL2 emits light of a second color, which is different from the first color. Thus, during the second period 2, the light emission of the second light-emitting element EL2 is controlled by the second data signal Data2, i.e., the grayscale of the second color is controlled by the second data signal Data2. In the second light-emitting stage T22, the second control voltage VDC2 is controlled to select the emission wavelength of the second light-emitting element EL2 (e.g., a quantum dot light-emitting element). The voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled within a second range to control the second quantum dot to emit light of a second color. For example, in the second light-emitting stage T22, the wavelength of the second color of light of the quantum dot light-emitting element is turned on, causing it to emit light of the second color. For example, in the second light-emitting stage T22, the second color of light is red.

[0149] In the third period 3 after the second period 2, the display process of the third period 3 includes a third data writing and reset stage T31 and a third light-emitting stage T32. A working process (control method) of the pixel circuit also includes the following steps. In the third data writing and reset stage T31, the first control signal Gate1 is a closed signal, the second control signal Gate2 and the fourth control signal Gate4 are both open signals, the second data writing transistor T5 and the second sensing transistor T6 are both turned on, and the second data signal Data2 is transmitted to the gate of the second driving transistor T4 through the second data writing transistor T5, for example, through the second external detection circuit through the second sensing signal line SENSE2 and the second sensing transistor T6 to write the first reset signal Sense1 to the second electrode of the second light-emitting element EL2. During the third light-emitting stage T32, the first control signal Gate1, the second control signal Gate2, and the fourth control signal Gate4 are all off signals. Due to the bootstrap effect of the second storage capacitor C2, the second driving transistor T4 remains on. At this time, the second control voltage VDC2 is controlled so that VDC2 – VN1 > VEL2, thereby causing the second light-emitting element EL2 to emit light and generating a third driving current through the second driving transistor T4 and the second light-emitting element EL2. For example, during the third light-emitting stage T32, the second light-emitting element EL2 emits light of a third color, which is different from both the first and second colors. Thus, during the third period 3, the light emission of the second light-emitting element EL2 is also controlled by the second data signal Data2, i.e., the grayscale of the third color is also controlled by the second data signal Data2. In the third light-emitting stage T32, the second control voltage VDC2 is controlled to select the emission wavelength of the second light-emitting element EL2, i.e., the quantum dot light-emitting element. The voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled within a third range to control the second quantum dot to emit light of a third color. For example, in the third light-emitting stage T32, the wavelength of the third color of the quantum dot light-emitting element is turned on, causing it to emit light of the third color. For example, in the third light-emitting stage T32, the third color of light is green.

[0150] Likewise, in the embodiments shown in FIG. 11 and FIG. 12 , the first color, the second color, and the third color are not limited to the listed types.

[0151] For example, for the pixel circuit shown in Figure 12, accordingly, the detection and compensation of the pixel circuit in the second compensation period and the third compensation period can also be achieved through the second sensing sub-circuit 4B, the second sensing signal line SENSE2 and the second external detection circuit. The specific method is similar to that achieved through the first sensing sub-circuit 4A, the first sensing signal line SENSE1 and the first external detection circuit in the previous embodiment, and can be compared with the previous description and will not be repeated.

[0152] Furthermore, during the detection and compensation process for the pixel circuit shown in FIG11 , the at least two compensation periods can refer to the description of the previous embodiments. However, different sensing sub-circuits and sensing signal lines can be used to respectively perform detection for compensating the light emission of the first light-emitting element and the second light-emitting element. For example, in some embodiments, during detection for compensating the light emission of the first light-emitting element, the reset signal Sense can be input via the first sensing sub-circuit 4A and the first sensing signal line SENSE1, while during detection for compensating the light emission of the second light-emitting element, the reset signal Sense can be input via the second sensing sub-circuit 4B and the second sensing signal line SENSE2. Of course, this is not limited to this embodiment. For example, in other embodiments, during detection for compensating the light emission of the first light-emitting element, the reset signal Sense can be input via the second sensing sub-circuit 4B and the second sensing signal line SENSE2, while during detection for compensating the light emission of the second light-emitting element, the reset signal Sense can be input via the first sensing sub-circuit 4A and the first sensing signal line SENSE1.

[0153] For other unmentioned features of the embodiments shown in FIG. 11 and FIG. 12 , reference may be made to the description of the previous embodiments.

[0154] At least one embodiment of the present disclosure further provides a display panel, which includes any one of the pixel circuits provided in the embodiments of the present disclosure. For example, with reference to FIG2 , the display panel includes the display substrate shown in FIG2 , and the display panel may further include structures such as an encapsulation layer. For example, the display panel may be a flexible panel or a rigid panel. For example, with reference to FIG2 , the display panel includes a plurality of sub-pixels arranged in an array within a display region DR, and each of the plurality of sub-pixels participating in the display includes any one of the pixel circuits provided in the embodiments of the present disclosure.

[0155] FIG13A is a schematic diagram of the structure of the first light-emitting element and the second light-emitting element of the pixel circuit provided in an embodiment of the present disclosure. Referring to FIG13A , for example, a sub-pixel includes a substrate 01, and at least part of the pixel circuit of the sub-pixel is arranged on the main surface of the substrate 01. The substrate 01 can be a substrate such as a glass substrate, or a flat layer, etc., and the specific film type of the substrate 01 is not limited. For example, each sub-pixel participating in the display includes a first light-emitting element EL1 and a second light-emitting element EL2 stacked and arranged perpendicular to the main surface of the substrate 01. For example, other electronic components of the pixel circuit, such as various thin-film transistors and capacitors, are also arranged on the main surface of the substrate 01. Referring to FIG13A , for example, the first light-emitting element EL1 includes a first electrode 1a, a first light-emitting layer 1c, and a second electrode 1b stacked in sequence on the main surface perpendicular to the substrate 01; the second light-emitting element EL2 includes a first electrode 2a, a first light-emitting layer 2c, and a second electrode 2b stacked in sequence on the main surface perpendicular to the substrate 01. The first electrode 1a of the first light-emitting element EL1 and the second electrode 2b of the second light-emitting element EL2 are close to each other and electrically connected. For example, in FIG13A , the second electrode 1b of the first light-emitting element EL1 is located on a side of the first electrode 1a of the first light-emitting element EL1 that is closer to the substrate 01; the second electrode 2b of the second light-emitting element EL2 is located on a side of the first electrode 2a of the second light-emitting element EL2 that is closer to the substrate 01, and the first electrode 1a of the first light-emitting element EL1 and the second electrode 2b of the second light-emitting element EL2 are close to each other. As described above, the first light-emitting element EL1 and the second light-emitting element EL2 are configured to emit light during different time periods. The display period of a frame of image includes at least two time periods, and the at least two time periods include a first time period and a second time period. During the first time period, at least the first light-emitting element EL1 emits light of a first color, and during the second time period, at least the second light-emitting element EL2 emits light of a second color.

[0156] For example, in FIG13A , the first electrode 1 a of the first light-emitting element EL1 and the second electrode 2 b of the second light-emitting element EL2 form an integrated common electrode. An integrated common electrode is an integrally formed structure made of uniform material, without seams or joints. For example, the common electrode may be made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0157] For example, the overall structure formed by the first light-emitting element EL1 and the second light-emitting element EL2 shown in FIG13A is a top-emitting type. Among the stacked film layers of the first light-emitting element EL1 and the second light-emitting element EL2, the second electrode 1b of the first light-emitting element EL1 is the film layer closest to the substrate 01 and serves as a reflective anode. For example, the material of the second electrode 1b of the first light-emitting element EL1 is a metal material, such as a Ti / Al / Ti stacked material. The material of the second electrode 2a of the second light-emitting element EL2 is also a transparent conductive material to improve light transmittance, such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0158] Of course, the materials of the first electrode and the second electrode of the first light-emitting element EL1 and the first electrode and the second electrode of the second light-emitting element EL2 are not limited to the types listed above.

[0159] FIG13B is another schematic diagram of the structure of the first light-emitting element and the second light-emitting element of the pixel circuit provided by an embodiment of the present disclosure. For example, as shown in FIG13B , in other embodiments, the first electrode 1a of the first light-emitting element EL1 and the second electrode 2b of the second light-emitting element EL2 are adjacent to and in contact with each other, that is, they are attached to each other for electrical connection. For example, the materials of the first electrode 1a of the first light-emitting element EL1 and the second electrode 2b of the second light-emitting element EL2 can be the same or different; for example, the materials of the first electrode 1a of the first light-emitting element EL1 and the second electrode 2b of the second light-emitting element EL2 are both transparent conductive layers to improve light transmittance.

[0160] For example, at least one of the first light-emitting element EL1 and the second light-emitting element EL2 is a quantum dot light-emitting element; for example, in Figure 14, the first light-emitting element EL1 is an OLED element, and the first light-emitting layer 1c is an OLED light-emitting layer; the second light-emitting element EL2 is a quantum dot light-emitting element, and the second light-emitting layer 2c is a quantum dot light-emitting layer, including a first quantum dot Q1 and a second quantum dot Q2, and the first quantum dot Q1 and the second quantum dot Q2 are configured to be able to distribute and excite light of different colors; for example, the first quantum dot Q1 can be excited to emit light of a second color, and the second quantum dot Q2 can be excited to emit light of a third color.

[0161] For example, the quantum dot light-emitting layer includes a plurality of quantum dot sublayers stacked in a direction perpendicular to the main surface of the substrate 01, and each quantum dot sublayer includes a plurality of first quantum dots Q1 and a plurality of second quantum dots Q2 that are distributed alternately with each other. That is, in each quantum dot sublayer, the plurality of first quantum dots Q1 and the plurality of second quantum dots Q2 are distributed alternately to improve the uniformity of light emission from the entire quantum dot light-emitting layer. For example, in each quantum dot sublayer, along a first direction and a second direction that intersect with each other, a first quantum dot Q1 is adjacent to a second quantum dot Q2, for example, the first direction and the second direction are perpendicular. For example, in each quantum dot sublayer, the plurality of first quantum dots Q1 and the plurality of second quantum dots Q2 are distributed alternately and evenly, that is, the spacing between adjacent first quantum dots Q1 and second quantum dots Q2 is equal, to further improve the uniformity of light emission from the entire quantum dot light-emitting layer.

[0162] Figure 13C is another structural schematic diagram of the first light-emitting element and the second light-emitting element of the pixel circuit provided by an embodiment of the present disclosure. For example, in the embodiment shown in Figure 13C, the overall structure composed of the first light-emitting element EL1 and the second light-emitting element EL2 is a bottom emission type, and the second electrode 1b of the first light-emitting element EL1 is the film layer farthest from the substrate 01 and is a reflective anode, and light is emitted from the substrate 01.

[0163] FIG14 is a schematic diagram of a display device provided in accordance with an embodiment of the present disclosure. Referring to FIG14 , at least one embodiment of the present disclosure further provides a display device 100, comprising any one of the display substrates 10 provided in accordance with the present disclosure. The display device may be, for example, a display panel, or any product or component with a display function, such as a monitor, an OLED panel, an OLED TV, electronic paper, a mobile phone, a tablet computer, a laptop computer, a digital photo frame, or a navigation system. Of course, the display devices provided in accordance with the present disclosure are not limited to the types listed above.

[0164] Accordingly, the display panel and display device provided by the embodiments of the present disclosure both have the technical effects of the pixel circuit and display substrate provided by the embodiments of the present disclosure.

[0165] There are a few points to note:

[0166] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0167] (2) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0168] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A pixel circuit, comprising: A first driving subcircuit and a first light-emitting element, wherein the first driving subcircuit is configured to control a magnitude of a driving current flowing through the first light-emitting element; and a second driving subcircuit and a second light-emitting element, wherein the second driving subcircuit is configured to control the magnitude of a driving current flowing through the second light-emitting element; The first electrode of the first light-emitting element is electrically connected to the second electrode of the second light-emitting element. The second electrode of the first light-emitting element is electrically connected to the first control voltage terminal to receive a first control voltage. The first electrode of the second light-emitting element is electrically connected to the second control voltage terminal to receive a second control voltage.

2. The pixel circuit according to claim 1, wherein: At least one of the first light-emitting element and the second light-emitting element is a quantum dot light-emitting element; The first light emitting element emits light under the action of a first voltage difference between a first electrode and a second electrode of the first light emitting element, and the second light emitting element emits light under the action of a second voltage difference between the first electrode and the second electrode of the second light emitting element.

3. The pixel circuit according to claim 2, wherein: One of the first light-emitting element and the second light-emitting element is a light-emitting diode element, and the other is a quantum dot light-emitting element; The light emitting diode element emits light of a first color; The quantum dot light emitting element includes a first quantum dot and a second quantum dot, wherein the first quantum dot emits light of a second color, and the second quantum dot emits light of a third color.

4. The pixel circuit according to claim 2, wherein: The first light-emitting element and the second light-emitting element are both quantum dot light-emitting elements; The quantum dot light emitting element includes a first quantum dot, a second quantum dot and a third quantum dot, and the first quantum dot, the second quantum dot and the third quantum dot emit light of a first color, light of a second color and light of a third color respectively.

5. The pixel circuit according to any one of claims 1 to 4, further comprising: a first data writing subcircuit, configured to write a first data signal into a control terminal of the first driving subcircuit in response to a first data scanning signal, wherein the first driving subcircuit is configured to control a magnitude of a driving current flowing through the first light-emitting element according to the first data signal; The second data writing subcircuit is configured to write a second data signal into the control terminal of the second driving subcircuit in response to a second data scanning signal, and the second driving subcircuit is configured to control the magnitude of the driving current flowing through the second light-emitting element according to the second data signal.

6. The pixel circuit according to claim 5, further comprising: a first storage subcircuit, wherein the first data writing subcircuit is electrically connected to the first end of the first storage subcircuit and is configured to transmit the first data signal to the first end of the first storage subcircuit in response to a first data scanning signal; the first driving subcircuit comprises a control end, a first end, and a second end, the control end of the first driving subcircuit is electrically connected to the first end of the first storage subcircuit, the first end of the first driving subcircuit is configured to receive a first power supply voltage, and the second end of the first driving subcircuit, the second end of the first storage subcircuit, the second electrode of the first light-emitting element, and the first electrode of the second light-emitting element are connected to a first node; and a second storage sub-circuit, wherein the second data writing sub-circuit is electrically connected to the first end of the second storage sub-circuit and is configured to transmit the second data signal to the first end of the second storage sub-circuit in response to a second data scanning signal; the second driving sub-circuit comprises a control end, a first end, and a second end, the control end of the second driving sub-circuit is electrically connected to the first end of the second storage sub-circuit, the first end of the second driving sub-circuit is configured to receive a second power supply voltage, and the second end of the second driving sub-circuit is electrically connected to the first node; The second terminal of the second storage sub-circuit is electrically connected to the first terminal of the second driving sub-circuit to receive the second power supply voltage, or the second terminal of the second storage sub-circuit is electrically connected to the first node.

7. The pixel circuit according to claim 6, wherein: The first driving subcircuit includes a first driving transistor, the first storage subcircuit includes a first storage capacitor, the gate of the first driving transistor is electrically connected to the first electrode of the first storage capacitor, the first electrode of the first driving transistor is configured to receive the first power supply voltage, the second electrode of the first driving transistor and the second electrode of the first storage capacitor are both electrically connected to the first node, and the first driving transistor is configured to control a current for driving the first light-emitting element to emit light under the control of a voltage of the gate of the first driving transistor; The second driving subcircuit includes a second driving transistor, the second storage subcircuit includes a second storage capacitor, the gate of the second driving transistor is electrically connected to the first electrode of the second storage capacitor The first electrode of the second driving transistor is configured to receive the second power supply voltage, the second electrode of the second driving transistor is electrically connected to the first node, and the second driving transistor is configured to control a current for driving the second light-emitting element to emit light under the control of a voltage of a gate of the second driving transistor; In a case where the second end of the second storage subcircuit is electrically connected to the first end of the second driving subcircuit to receive the second power supply voltage, the second electrode of the second storage capacitor is electrically connected to the first electrode of the second driving transistor; When the second end of the second storage sub-circuit is electrically connected to the first node, the second electrode of the second storage capacitor is electrically connected to the first node.

8. The pixel circuit according to claim 7, wherein: The first data writing sub-circuit comprises a first data transistor, a first electrode of the first data transistor is electrically connected to a first electrode of the first storage capacitor and a gate of the first driving transistor, a second electrode of the first data transistor is configured to receive a first data signal, and the first data transistor is configured to write the first data signal into the gate of the first driving transistor and the first storage capacitor in response to a first data scanning signal; The second data writing sub-circuit includes a second data transistor, a first electrode of the second data transistor is electrically connected to the first electrode of the second storage capacitor and the gate of the second driving transistor, a second electrode of the second data transistor is configured to receive a second data signal, and the second data transistor is configured to write the second data signal into the gate of the second driving transistor and the second storage capacitor in response to a second data scanning signal.

9. The pixel circuit according to any one of claims 5 to 8, further comprising: A first sensing sub-circuit and a first sensing signal line, wherein the first end of the first sensing sub-circuit is electrically connected to the first node, the control end of the first sensing sub-circuit is configured to receive a first sensing scan signal, the second end of the first sensing sub-circuit is electrically connected to the first sensing signal line, the first sensing signal line is electrically connected to a first external detection circuit, and the first sensing sub-circuit is configured to detect the electrical characteristics of the sub-pixel to which it belongs through the first external detection circuit in response to the first sensing scan signal to achieve compensation.

10. The pixel circuit according to claim 9, wherein: The first sensing sub-circuit includes a first sensing transistor, a first electrode of the first sensing transistor is electrically connected to the first node, a second electrode of the first sensing transistor is electrically connected to the first sensing signal line to be connected to the first external detection circuit, a gate of the first sensing transistor is configured to receive the first sensing scan signal, and the first sensing transistor is configured to detect the electrical characteristics of the sub-pixel to which it belongs through the first external detection circuit in response to the first sensing scan signal to achieve external compensation.

11. The pixel circuit according to claim 9 or 10, further comprising: A second sensing sub-circuit and a second sensing signal line, wherein a first end of the second sensing sub-circuit is electrically connected to the first node, a control end of the second sensing sub-circuit is configured to receive a second sensing scan signal, a second end of the first sensing sub-circuit is electrically connected to the second sensing signal line, the second sensing signal line is electrically connected to a second external detection circuit, and the second sensing sub-circuit is configured to detect electrical characteristics of the sub-pixel to which it belongs through the second external detection circuit in response to the second sensing scan signal to achieve external compensation.

12. The pixel circuit according to claim 11, wherein: The second sensing sub-circuit includes a second sensing transistor, a first electrode of the second sensing transistor is electrically connected to the first node, a second electrode of the second sensing transistor is electrically connected to the second sensing signal line to be connected to the second external detection circuit, a gate of the second sensing transistor is configured to receive the second sensing scan signal, and the second sensing transistor is configured to detect the electrical characteristics of the sub-pixel to which it belongs through the second external detection circuit in response to the second sensing scan signal to achieve external compensation.

13. The pixel circuit according to any one of claims 1 to 12, wherein: The first control voltage terminal and the second control voltage terminal are the same voltage terminal, and the second control voltage and the first control voltage are voltage signals from the same voltage terminal, or, The first control voltage terminal and the second control voltage terminal are different voltage terminals, and the second control voltage and the first control voltage are different voltage signals from different voltage terminals.

14. A method for controlling a pixel circuit, wherein: The control method is applicable to the pixel circuit according to any one of claims 1 to 13, and the control method comprises: The first light-emitting element and the second light-emitting element are controlled to emit light in different time periods respectively, wherein the display period of a frame of image includes at least two time periods, and the at least two time periods include a first time period and a second time period, in the first time period at least the first light-emitting element emits light of a first color, and in the second time period at least the second light-emitting element emits light of a second color.

15. The method for controlling a pixel circuit according to claim 14, comprising: The first control voltage and the second control voltage are controlled to control a first voltage difference between a first electrode and a second electrode of the first light emitting element and a second voltage difference between a first electrode and a second electrode of the second light emitting element, wherein: When the first voltage difference is greater than a first turn-on voltage of the first light-emitting element, the first light-emitting element emits light; When the second voltage difference is greater than a second turn-on voltage of the second light emitting element, the second light emitting element emits light.

16. The method for controlling a pixel circuit according to claim 14 or 15, wherein: The quantum dot light emitting element comprises different quantum dots that emit light of different colors, respectively, and the different quantum dots that emit light of different colors correspond to different voltage differences applied between the first electrode and the second electrode of the quantum dot light emitting element; The control method comprises: The voltage difference range between the first electrode and the second electrode of the quantum dot light emitting element is controlled to control the corresponding quantum dot to emit light of corresponding color.

17. The method for controlling a pixel circuit according to claim 16, wherein: One of the first light-emitting element and the second light-emitting element is a light-emitting diode element, and the other is a quantum dot light-emitting element, wherein the quantum dot light-emitting element includes a first quantum dot and a second quantum dot; The control method comprises: During the first period, controlling the light emitting diode element to emit light of a first color and controlling the first quantum dot to emit light of a second color; and During the second period, the second quantum dot is controlled to emit light of a third color.

18. The method for controlling a pixel circuit according to claim 17, wherein: In the case where the pixel circuit includes a first data writing subcircuit and a second data writing subcircuit, the first data writing subcircuit is configured to write a first data signal into a control terminal of the first driving subcircuit in response to a first data scanning signal, the first driving subcircuit is configured to control the magnitude of a driving current flowing through the first light-emitting element according to the first data signal, the second data writing subcircuit is configured to write a second data signal into the control terminal of the second driving subcircuit in response to a second data scanning signal, and the second driving subcircuit is configured to control the magnitude of a driving current flowing through the second light-emitting element according to the second data signal, The control method comprises: In the first period, writing the first data signal for controlling the grayscale of the first color and the grayscale of the second color; and During the second period, the second data signal for controlling the gray scale of the third color is written.

19. The method for controlling a pixel circuit according to claim 16, wherein: One of the first light-emitting element and the second light-emitting element is a light-emitting diode element, and the other is a quantum dot light-emitting element, wherein the quantum dot light-emitting element includes a first quantum dot and a second quantum dot; The at least two light emitting periods further include a third period; The control method comprises: During the first period, controlling the light emitting diode element to emit light of a first color; During the second period, controlling the first quantum dot to emit light of a second color; and In the third time period, the second quantum dot is controlled to emit light of a third color.

20. The method for controlling a pixel circuit according to claim 16, wherein: The first light-emitting element and the second light-emitting element are both quantum dot light-emitting elements, and the quantum dot light-emitting element includes a first quantum dot, a second quantum dot and a third quantum dot; The at least two light emitting periods further include a third period; The control method comprises: During the first time period, controlling the first quantum dot to emit light of a first color; During the second period, controlling the second quantum dot to emit light of a second color; and In the third time period, the third quantum dot is controlled to emit light of a third color.

21. The method for controlling a pixel circuit according to claim 19 or 20, wherein: In the case where the pixel circuit further includes a second data writing subcircuit, the second data writing subcircuit is configured to write a second data signal into the control terminal of the second driving subcircuit in response to a second data scanning signal, and the second driving subcircuit is configured to control the magnitude of the driving current flowing through the second light-emitting element according to the second data signal, The control method comprises: In the first period, writing the first data signal for controlling the gray scale of the first color; and In the second period and the third period, the second data signals for controlling grayscales of the second color and the third color are written, respectively.

22. The method for controlling a pixel circuit according to any one of claims 17 to 21, comprising: Control the voltage difference between the first electrode and the second electrode of the quantum dot light emitting element to be within a first range to control the first quantum dot to emit the second color of light; as well as The voltage difference between the first electrode and the second electrode of the quantum dot light emitting element is controlled to be within a second range to control the second quantum dot to emit the light of the third color.

23. The method for controlling a pixel circuit according to any one of claims 14 to 22, wherein: In the case where the first driving sub-circuit includes a first driving transistor and the second driving sub-circuit includes a second driving transistor, the control method includes: detecting electrical characteristics of the pixel circuit, and compensating the pixel circuit according to the electrical characteristics, wherein: The electrical characteristics include at least one of the aging degree of the first light-emitting element and / or the second light-emitting element, the threshold voltage of the first driving transistor and / or the second driving transistor, and the carrier mobility; the aging degree of the first light-emitting element and / or the second light-emitting element includes parameters affecting the light-emitting result of the first light-emitting element and / or the second light-emitting element due to the aging of the first light-emitting element and / or the second light-emitting element; and the parameters include at least one of the gate-source voltage Vgs of the first driving transistor and / or the gate-source voltage Vgs of the second driving transistor, and the driving current flowing through the first light-emitting element and / or the second light-emitting element; The step of detecting the electrical characteristics of the sub-pixel where the pixel circuit is located, and compensating the pixel circuit according to the electrical characteristics of the sub-pixel includes at least two compensation periods, and the control method of the pixel circuit includes: In each of the at least two compensation periods, for the first light-emitting element and / or the second light-emitting element that emit light, the electrical characteristics of the pixel circuit that drives the first light-emitting element and / or the second light-emitting element to emit light are detected, and the pixel circuit is compensated according to the electrical characteristics of the pixel circuit.

24. The method for controlling a pixel circuit according to claim 23, wherein: In the case where one of the first light-emitting element and the second light-emitting element is a light-emitting diode element and the other is a quantum dot light-emitting element, the quantum dot light-emitting element includes a first quantum dot and a second quantum dot, the control method includes: in the first time period, controlling the light-emitting diode element to emit light of a first color and controlling the first quantum dot to emit light of a second color, and in the second time period, controlling the second quantum dot to emit light of a third color, The at least two compensation periods include a first compensation period and a second compensation period, and the control method of the pixel circuit includes: During the first compensation period, respectively detecting electrical characteristics of the pixel circuits driving the first light-emitting element that emits the first color of light and the second light-emitting element that emits the second color of light, and respectively converting the detected electrical characteristics into digital signals, and simultaneously compensating the light emission conditions of the first light-emitting element and the second light-emitting element through the first data signal according to the digital signals; and During the second compensation period, the electrical characteristics of the pixel circuit of the second light-emitting element that drives the second light-emitting element to emit the third color of light are detected, and the detected electrical characteristics are converted into a digital signal, and the light emission of the second light-emitting element is compensated according to the digital signal through the second data signal.

25. The method for controlling a pixel circuit according to claim 23, wherein: In the case where the at least two light-emitting time periods include a first time period, a second time period, and a third time period, the control method includes: in the first time period, controlling the first light-emitting element to emit light of a first color, in the second time period, controlling the second light-emitting element to emit light of a second color, and in the third time period, controlling the second light-emitting element to emit light of a third color, The at least two compensation periods include a first compensation period, a second compensation period, and a third compensation period, and the control method of the pixel circuit includes: During the first compensation period, an electrical characteristic of a pixel circuit driving the first light-emitting element to emit light of the first color is detected, and the detected electrical characteristic is converted into a digital signal, and the light emission of the first light-emitting element is compensated according to the digital signal through the first data signal; During the second compensation period, an electrical characteristic of a pixel circuit driving the second light-emitting element to emit light of the second color is detected, and the detected electrical characteristic is converted into a digital signal, and the light emission of the second light-emitting element is compensated by the second data signal according to the digital signal; and During the third compensation period, the electrical characteristics of the pixel circuit of the second light-emitting element that drives the second light-emitting element to emit the third color of light are detected, and the detected electrical characteristics are converted into a digital signal, and the light emission of the second light-emitting element is compensated according to the digital signal through the second data signal.

26. A display panel, comprising the pixel circuit according to any one of claims 1-13.

27. The display panel according to claim 26, comprising sub-pixels, wherein: The sub-pixel includes the pixel circuit; The sub-pixel includes a substrate, at least part of the pixel circuit is arranged on the main surface of the substrate, the sub-pixel includes the first light-emitting element and the second light-emitting element stacked in a direction perpendicular to the main surface of the substrate, the first light-emitting element includes a first electrode, a first light-emitting layer, and a second electrode stacked in sequence on the main surface perpendicular to the substrate, the second light-emitting element includes a first electrode, a first light-emitting layer, and a second electrode stacked in sequence on the main surface perpendicular to the substrate, the first electrode of the first light-emitting element and the second electrode of the second light-emitting element are close to each other and electrically connected; The first light-emitting element and the second light-emitting element are configured to emit light in different time periods respectively. The display period of a frame of image includes at least two time periods, and the at least two time periods include a first time period and a second time period. In the first time period, at least the first light-emitting element emits light of a first color, and in the second time period, at least the second light-emitting element emits light of a second color.

28. The display panel according to claim 27, wherein: The first electrode of the first light-emitting element and the second electrode of the second light-emitting element are adjacent to and in contact with each other; or, The first electrode of the first light emitting element and the second electrode of the second light emitting element form an integrated common electrode.

29. The display panel according to claim 27 or 28, wherein: In the case where one of the first light-emitting element and the second light-emitting element is a light-emitting diode element and the other is a quantum dot light-emitting element, and the quantum dot light-emitting element includes a first quantum dot and a second quantum dot, The quantum dot light-emitting element includes a quantum dot light-emitting layer, which includes a plurality of quantum dot sublayers stacked in a direction perpendicular to the main surface of the substrate, each of the quantum dot sublayers includes a plurality of first quantum dots and a plurality of second quantum dots distributed alternately, and the first quantum dots and the second quantum dots are configured to be able to distribute light of different colors that are excited.

30. A display device comprising the display panel according to any one of claims 26-29.

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