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

Abstract

The invention discloses a pixel circuit and a control method thereof, a display panel and a display device. The pixel circuit comprises a first driving sub-circuit, a first light-emitting element, a second driving sub-circuit and a second light-emitting element. The first driving sub-circuit is configured to control the magnitude of a driving current flowing through the first light-emitting element; the second driving sub-circuit is configured to control the magnitude of a driving current flowing through the second light-emitting element; a first electrode of the first light-emitting element is electrically connected with a second electrode of the second light-emitting element, a second electrode of the first light-emitting element is electrically connected with a first control voltage end to receive a first control voltage, and a first electrode of the second light-emitting element is electrically connected with a second control voltage end to receive a second control voltage.

Description

Technical Field

[0001] 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

[0002] Organic light emitting diode (OLED) display devices have gradually attracted widespread attention due to their advantages such as wide viewing angle, high contrast, fast response speed, higher luminance and lower driving voltage compared to inorganic light emitting display devices. Due to the above characteristics, organic light emitting diodes (OLED) can be applied to devices with display functions such as mobile phones, monitors, laptops, digital cameras, instruments and meters.

[0003] The pixel circuit in the OLED display device generally adopts a matrix drive mode, which is divided into active matrix (AM) drive and passive matrix (PM) drive according to whether switching components are introduced in each pixel unit. Although PMOLED has simple process and low cost, it cannot meet the needs of high-resolution large-size display due to the disadvantages of crosstalk, high power consumption and low life. In contrast, AMOLED integrates a group of thin film transistors and storage capacitors in the pixel circuit of each pixel. By driving and controlling the thin film transistors and storage capacitors, the current flowing through the OLED is controlled, so that the OLED can emit light as needed. Compared with PMOLED, AMOLED requires less driving current, lower power consumption and longer life, and can meet the needs of high-resolution multi-grayscale large-size display. At the same time, AMOLED has obvious advantages in viewing angle, color reproduction, power consumption and response time, and is suitable for display devices with high information content and high resolution.

[0004] 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. Summary of the invention

[0005] At least one embodiment of the present disclosure provides a pixel circuit, which includes: a first driving subcircuit and a first light-emitting element, a second driving subcircuit and a second light-emitting element. The first driving subcircuit is configured to control the magnitude of a driving current flowing through the first light-emitting element; 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 and the 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.

[0006] 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.

[0007] 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.

[0008] 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 emit light of a first color, light of a second color and light of a third color, respectively.

[0009] 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; the second data writing subcircuit is configured to write a second data signal into a 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.

[0010] 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, 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 node; 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, or the second end of the second storage subcircuit is electrically connected to the first node.

[0011] For example, in a pixel circuit provided by at least one embodiment of the present disclosure, 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 the current for driving the first light-emitting element to emit light under the control of the 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 the current for driving the second light-emitting element to emit light under the control of the voltage of the gate of the second driving transistor; when 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 subcircuit is electrically connected to the first node, the second electrode of the second storage capacitor is electrically connected to the first node.

[0012] 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, a 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, 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.

[0013] For example, the pixel circuit provided by at least one embodiment of the present disclosure further includes: a first sensing subcircuit and a first sensing signal line. The first end of the first sensing subcircuit is electrically connected to the first node, the control end of the first sensing subcircuit is configured to receive a first sensing scan signal, the second end of the first sensing subcircuit 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 subcircuit is configured to detect the electrical characteristics of the subpixel to which it belongs through the first external detection circuit in response to the first sensing scan signal to achieve external compensation.

[0014] 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, 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 connect 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.

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

[0016] 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.

[0017] 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.

[0018] At least one embodiment of the present disclosure also provides a control method for any one of the pixel circuits provided by 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 of image includes at least two time periods, 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.

[0019] 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.

[0020] 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 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; 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 dot to emit light of the corresponding color.

[0021] For example, in the control method of 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, 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.

[0022] 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 a 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 a 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 a driving current flowing through the second light-emitting element according to the second data signal. In this case, 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.

[0023] For example, in the control method of 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, and the quantum dot light-emitting element includes a first quantum dot and a second quantum dot; the at least two light-emitting time periods also include a third time period; the control method includes: in the first time period, controlling the light-emitting diode element to emit light of a first color; in the second time period, controlling the first quantum dot to emit light of a second color; and in the third time period, controlling the second quantum dot to emit light of a third color.

[0024] 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 time periods also include a third time period; the control method includes: in the first time period, controlling the first quantum dot to emit light of a first color; in the second time period, controlling the second quantum dot to emit light of a second color; and in the third time period, controlling the third quantum dot to emit light of a third color.

[0025] 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 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. In this case, the control method includes: in the first time period, writing the first data signal for controlling the gray scale of the first color; and in the second time period and the third time period, writing the second data signal for controlling the gray scale of the second color and the third color, respectively.

[0026] 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 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 within a second range to control the second quantum dot to emit light of the third color.

[0027] 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 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 light-emitting structure of the first light-emitting element and / or the second light-emitting element affected by the aging of the first light-emitting element and / or the second light-emitting element. The control method of the pixel circuit comprises: for each of the at least two compensation periods, for the first light emitting element and / or the second light emitting element that emits 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 sub-pixel.

[0028] 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 the first color and controlling the first quantum dot to emit light of the 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 control method of the pixel circuit includes: in the first compensation time period, respectively detecting the electrical characteristics of the pixel circuits driving 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 respectively converting the detected electrical characteristics into digital signals, and compensating the light emission conditions of the first light-emitting element and the second light-emitting element simultaneously through the first data signal according to the digital signal; and in the second compensation time period, detecting the electrical characteristics of the pixel circuit driving the second light-emitting element to emit light of the third color, and converting the detected electrical characteristics into digital signals, and compensating the light emission conditions of the second light-emitting element through the second data signal according to the digital signal.

[0029] 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 time periods include a first time period, a second time period, and a third time period, and 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, in the case where the at least two compensation time periods include a first compensation time period, a second compensation time period, and a third compensation time period, the control method of the pixel circuit includes: in the first compensation time period, detecting the electrical characteristics of the pixel circuit that drives the first light-emitting element to emit light of the first color, and generating the detected electrical characteristics; The electrical characteristic is converted into a digital signal, and the light emission 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 emission 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 emission of the second light-emitting element is compensated through the second data signal according to the digital signal.

[0030] At least one embodiment of the present disclosure further provides a display panel, which includes any pixel circuit provided by the embodiments of the present disclosure.

[0031] For example, a 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 on the main surface perpendicular to the substrate, and 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, 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 time 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.

[0032] 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 contact 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.

[0033] For example, in the display panel provided by at least one embodiment of the present disclosure, 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, 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 that is excited to emit different colors.

[0034] 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

[0035] 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, but are not intended to limit the present disclosure.

[0036] Figure 1 It is a schematic diagram of the overall plan of a display substrate;

[0037] Figure 2 is an overall plan view of a display substrate provided by an embodiment of the present disclosure;

[0038] Figure 3 is a schematic diagram of a pixel circuit provided by an embodiment of the present disclosure;

[0039] Figure 4 yes Figure 3 A timing diagram of a control method of the pixel circuit shown;

[0040] Figure 5A yes Figure 4 The schematic diagram of the circuit conduction state in the first time period 1 is shown;

[0041] Figure 5B yes Figure 4 The schematic diagram of the circuit conduction state in the second time period 2 shown;

[0042] Figure 6 yes Figure 3 A timing diagram of another control method of the pixel circuit shown;

[0043] Fig. 7A yes Figure 6 The schematic diagram of the circuit conduction state in the first time period 1 is shown;

[0044] Figure 7B yes Figure 6 The schematic diagram of the circuit conduction state in the second time period 2 shown;

[0045] Figure 7C yes Figure 6 The schematic diagram of the circuit conduction state in the third time period 3 is shown;

[0046] Figure 8 is a schematic diagram of another pixel circuit provided by an embodiment of the present disclosure;

[0047] Fig. 9A is a schematic diagram of a pixel circuit connected to an external detection circuit provided by an embodiment of the present disclosure;

[0048] Fig. 9B yes Fig. 9A An example of a pixel circuit connected to an external detection circuit is shown;

[0049] Fig.10 yes Fig. 9A A timing diagram of the compensation process of the pixel circuit shown;

[0050] Fig.11is a schematic diagram of another pixel circuit provided by an embodiment of the present disclosure;

[0051] Fig.12 yes Fig.11 A timing diagram of a control method for a pixel circuit as shown;

[0052] Fig.13A is a structural schematic diagram of a first light-emitting element and a second light-emitting element of a pixel circuit provided in an embodiment of the present disclosure;

[0053] Fig. 13B is another structural schematic diagram of a first light-emitting element and a second light-emitting element of a pixel circuit provided by an embodiment of the present disclosure;

[0054] Fig. 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;

[0055] Fig.14 is a schematic diagram of a display device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution 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, rather than 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.

[0057] Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present invention belongs. "First", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can 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 described object changes, the relative positional relationship may also change accordingly.

[0058] Figure 1 It is a schematic diagram of the overall plan of a display substrate. Figure 1The display substrate 101 generally includes a display area DR and a non-display area NR at least partially surrounding the display area DR. The display substrate 101 includes a plurality of display units PU located in the display area DR and distributed in an array, and the display unit PU performs a display function. Each display unit PU includes a plurality of sub-pixels R / G / B, for example, Figure 1 In the example, a display unit PU includes three sub-pixels, which are 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 can also be less than three or more than three. Each sub-pixel 100 includes a light-emitting element and a pixel circuit 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 cross each other to define a plurality of pixel areas distributed in an array in the display area DR, and a pixel circuit of a sub-pixel is set in each pixel area.

[0059] 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, which is not conducive to achieving a breakthrough improvement 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 a power line need to be set for each sub-pixel R / G / B, so the number of signal lines is large, which limits the improvement of the aperture ratio of the display substrate 101. However, improving the resolution and aperture ratio of the OLED display device is of great significance to improving the display quality, greatly improving the user experience.

[0060] At least one embodiment of the present disclosure provides a pixel circuit, which includes: a first driving subcircuit and a first light-emitting element, a second driving subcircuit and a second light-emitting element. The first driving subcircuit is configured to control the magnitude of a driving current flowing through the first light-emitting element; 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 and the 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.

[0061] At least one embodiment of the present disclosure also provides a control method for any one of the pixel circuits provided by 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 of image includes at least two time periods, 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.

[0062] At least one embodiment of the present disclosure further provides a display panel, which includes a sub-pixel, and the sub-pixel includes any one of the pixel circuits provided in the embodiments of the present disclosure; the sub-pixel includes the first light-emitting element and the second light-emitting element which are stacked; 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.

[0063] 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.

[0064] The pixel circuit provided by the embodiment of the present disclosure can be applied to a display device such as a display substrate or a display panel. Since in one 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 subcircuit and the second driving subcircuit independently drive different light-emitting elements, color display can be achieved in one sub-pixel by respectively emitting light of different colors by the first light-emitting element and the second light-emitting element. Compared with a traditional pixel circuit in which a sub-pixel includes only a light-emitting element that emits light of one color, and a pixel circuit of the one sub-pixel is used to drive the light-emitting element to emit only light of 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 a plurality of traditional sub-pixels that emit light of multiple colors respectively. For example, the pixel circuit provided by the embodiment of the present disclosure combines Figure 1The first sub-pixel R, the second sub-pixel G emitting green light, and the second sub-pixel B emitting blue light are converted into one sub-pixel RGB. Thus, on the one hand, in the display substrate using the pixel circuit provided by the embodiment of the present disclosure, by setting the first light-emitting element and the second light-emitting element in the same pixel, it is achieved that the usual multiple sub-pixels with different luminous colors are merged, and the area occupied by pixels with multiple luminous colors is reduced, thereby further improving the pixel aperture ratio and being able to achieve a higher resolution (PPI), which can be used to achieve 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 (TFT) of the entire display panel using the pixel circuit is greatly reduced, and there is no need to Figure 1 Each of the first sub-pixel R, the second sub-pixel G emitting green light, and the second sub-pixel B emitting blue light is provided with a data line and a power supply voltage line, respectively, which greatly reduces the number of signal lines of the entire display panel using the pixel circuit and improves the pixel aperture ratio.

[0065] For example, Figure 2 is a schematic overall plan view of a display substrate provided by an embodiment of the present disclosure. Figure 2 For example, the 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 located in the display area DR and distributed in an array, and the display unit PU performs a display function. Each display unit PU includes a sub-pixel RGB. For example, the display substrate 10 includes a base substrate 1, and the base substrate 1 includes a main surface. The pixel array including a plurality of display units PU is arranged 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 light-emitting element EL1 and the second light-emitting element EL2. For example, the first light-emitting element EL1 and the second light-emitting element EL2 are stacked in a direction perpendicular to the main surface of the base substrate 1, and the first light-emitting element EL1 and the second light-emitting element EL2 respectively emit light of different colors. Thus, the one sub-pixel can emit light of multiple colors. For example, Figure 1 In the example, a display unit PU emits three different colors of light, for example, a sub-pixel RGB can emit red light, green light, and blue light. Of course, the types of light that a display unit PU can emit are not limited to three, and can also be less than three or more than three.

[0066] For example, Figure 1 As shown, 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 cross each other to define a plurality of pixel areas distributed in an array in the display area DR, and a pixel circuit of a sub-pixel RGB is disposed in each pixel area.

[0067] For example, Figure 1 As shown, the display substrate 10 may further include a scan drive circuit SC and a data drive circuit DC located in the non-display area NR, wherein the scan drive circuit SC is, for example, a gate drive circuit (such as a GOA drive circuit). The scan drive circuit SC is connected to the pixel circuit through the scan line GL to provide various scan signals, and the data drive circuit DC is connected to the pixel circuit through the data line DL to provide data signals. Figure 1 The positional relationship between the scan driving circuit SC and the data driving circuit DC, the scan lines GL and the data lines DL in the display substrate shown in the figure is only an example, and the actual arrangement positions can be designed as required.

[0068] 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 subcircuit 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, such as including a processor and a memory, the memory including an executable code, and the processor runs the executable code to execute the above-mentioned detection method.

[0069] For example, the processor may be a central processing unit (CPU) or other forms of processing devices having data processing capabilities and / or instruction execution capabilities, such as a microprocessor, a programmable logic controller (PLC), etc.

[0070] For example, the storage device may include one or more computer program products, and the computer program product 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 (cache), etc. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor may run the desired function of the program instruction. Various applications and various data may also be stored in the computer-readable storage medium.

[0071] Of course, the pixel circuit of a single pixel including the OLED light-emitting device and the QD light-emitting device stacked on each other is not limited to the above-mentioned 5T2C (i.e., 5 transistors and 2 capacitors) pixel circuit, and can be designed as needed, and can be a pixel circuit such as nTmC (n, m are positive integers), and in different embodiments, the pixel circuit can further include a compensation subcircuit, the compensation subcircuit includes an internal compensation subcircuit or an external compensation subcircuit, and the compensation subcircuit can include a transistor, a capacitor, etc. For example, as needed, the pixel circuit can further include a reset circuit, a light-emitting control subcircuit, a detection circuit, etc.

[0072] The structures of the first light-emitting element and the second light-emitting element will be introduced 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 introduced.

[0073] Figure 3 is a schematic diagram of a pixel circuit provided by an embodiment of the present disclosure. Figure 3 , 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.

[0074] Combination Figure 2 and Figure 3 In a pixel circuit provided by an embodiment of the present disclosure, the first electrode of the first light-emitting element EL1 is electrically connected to the second electrode of the second light-emitting element EL2, and the first driving subcircuit 1A and the second driving subcircuit 1B independently drive different light-emitting elements, so that color display can be achieved in a sub-pixel RGB by the first light-emitting element EL1 and the second light-emitting element EL2 emitting light of different colors, respectively. Figure 1Compared with the conventional pixel circuit in which a light-emitting element that emits only one color of light is included in one sub-pixel, the pixel circuit drives the light-emitting element to emit only one color of light by using the pixel circuit of the one sub-pixel, and color display is achieved by emitting different colors of light through a plurality of sub-pixels respectively. The pixel circuit provided by the embodiments of the present disclosure realizes the combination of a plurality of conventional sub-pixels that emit a plurality of colors of light respectively. For example, the pixel circuit provided by the embodiments of the present disclosure combines Figure 1 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 Figure 1 into one sub-pixel RGB. Thus, on the one hand, in the display substrate 10 adopting the pixel circuit provided by the embodiments 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 a plurality of sub-pixels with different light-emitting colors is realized, the area occupied by the pixels with a plurality of light-emitting colors is reduced, and thus the pixel aperture ratio is further improved and a higher resolution (PPI) can be achieved, which can be used to realize 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, and

[0075] it is not necessary to respectively 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

[0076] 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. 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 turn-on 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 turn-on 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.

[0076] 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 light emitting element. Figure 3 The pixel circuit is described by taking the 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 as an example.

[0077] refer to Figure 3 , the luminance of the first light-emitting element EL1 (i.e., the light-emitting diode element) is positively correlated with the difference of 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., the quantum dot light-emitting element) includes a plurality of quantum dots with different luminous colors, and the luminous wavelengths of different quantum dot light-emitting elements are discontinuous wavelengths, which are related to the second voltage difference, that is, under the action of different values ​​of the second voltage difference VDC2-VN1, the luminous color points of the quantum dot light-emitting element are different, that is, different types of luminous quantum dots emit light of different colors. 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 one frame, and finally full-color display can be achieved through color mixing.

[0078] For example, in Figure 3 In the illustrated embodiment, the first light emitting element EL1, i.e., an organic light emitting diode (OLED) element, emits light of a first color, for example, the first color of light is 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, the first quantum dot emits light of a second color, and the second quantum dot emits light of a third color, for example, the second color of light is red light, and the third color of light is green light. Of course, in other embodiments, the colors of the first color of light, the second color of light, and the third color of light are not limited to the above-mentioned cases. 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 types, for example, quantum dots whose luminous colors are other colors of light besides red light and green light may also be included. Under the design principle of the disclosed embodiment, adjustments may be made as needed.

[0079] refer to Figure 3For example, the pixel circuit provided by an embodiment of the present disclosure further includes: a first data writing subcircuit 2A and a second data writing subcircuit 2B. The first data writing subcircuit 2A is configured to write the first data signal Data1 into the control end of the first driving subcircuit 1A in response to the first data scanning signal Gate1, and the first driving subcircuit 1A is configured to control the magnitude of the driving current flowing through the first light-emitting element EL1 according to the first data signal Data1; the second data writing subcircuit 2B is configured to write the second data signal Data2 into the control end of the second driving subcircuit 1B in response to the second data scanning signal Gate2, and the second driving subcircuit 1B is configured to control the magnitude of the driving current flowing through the second light-emitting element EL2 according to the second data signal Data2, so as to realize writing the first data signal Data1 into the control end of the first driving subcircuit 1A for controlling the magnitude of the driving current flowing through the first light-emitting element EL1, and writing the second data signal Data2 into the control end of the second driving subcircuit 1B for controlling the magnitude of the driving current flowing through the second light-emitting element EL2.

[0080] refer to Figure 3For example, the pixel circuit further includes a first storage subcircuit 3A and a second storage subcircuit 3B. The first data writing subcircuit 2A is electrically connected to the first end of the first storage subcircuit 3A and is configured to transmit the first data signal Data1 to the first end of the first storage subcircuit 3A in response to the first data scanning signal Gate1; the first driving subcircuit 1A includes a control end, a first end, and a second end. The control end of the first driving subcircuit 1A is electrically connected to the first end of the first storage subcircuit 3A. The first end of the first driving subcircuit 1A is configured to receive the first power supply voltage VDD. The second end of the first driving subcircuit 1A, the second end of the first storage subcircuit 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 the 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 as to generate a driving current for driving the first light-emitting element EL1 to emit light according to the first data signal Data1, for example, in 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 as to generate a driving current for driving the second light-emitting element EL2 to emit light according to the second data signal Data2, for example, in the light-emitting stage.

[0081] For example, the first power supply voltage is a high power supply voltage VDD, and the second power supply voltage is a low power supply voltage VSS. For example, the second power supply voltage terminal is a ground terminal.

[0082] For example, the first driving sub-circuit 1A includes a first driving transistor T2, the first storage sub-circuit 3A includes a first storage capacitor C1, the gate of the first driving transistor T2 is electrically connected to the first electrode of the first storage capacitor C1, the first electrode of the first driving transistor T2 is configured to receive the first power supply voltage VDD, the second electrode of the first driving transistor T2 and the second electrode of the first storage capacitor C1 are both electrically connected to the first node N1, and the first driving transistor T2 is configured to control the current used to drive the first light-emitting element EL1 to emit light under the control of the voltage of the gate of the first driving transistor T2; the second driving sub-circuit 1B includes a second driving transistor T4, the second storage sub-circuit 3B includes a second storage capacitor C2, 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 driving transistor T4 is configured to control the current used to drive the second light-emitting element EL2 to emit light under the control of the voltage of the gate of the second driving transistor T4; the second electrode of the second storage capacitor C2 is electrically connected to the first electrode of the second driving transistor T4. Thus, 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.

[0083] 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, a second electrode of the first data transistor T1 is configured to receive the 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 the 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, a second electrode of the second data transistor T5 is configured to receive the 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 the second data scanning signal Gate2.

[0084] refer to Figure 3For example, the pixel circuit further includes: a first sensing subcircuit 4A and a first sensing signal line SENSE1, a first end of the first sensing subcircuit 4A is electrically connected to the first node N1, a control end of the first sensing subcircuit 4A is configured to receive a first sensing scan signal Gate3, a second end of the first sensing subcircuit 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, and the first sensing subcircuit 4A is configured to detect the electrical characteristics of the pixel circuit of the subpixel to which it belongs through the first external detection circuit in response to the first sensing scan signal Gate3 to achieve external compensation. The electrical characteristics, for example, include at least one of the threshold voltage and / or carrier mobility of the first driving transistor T2, the threshold voltage and / or carrier mobility of the second driving transistor T4, and the driving current of the first light-emitting element EL1 and / or the second light-emitting element EL2. The first external detection circuit is, for example, a conventional circuit including a digital-to-analog converter (DAC) and an analog-to-digital converter (ADC), and the first external detection circuit and the detection and compensation method will be described later.

[0085] refer 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, a gate of the first sensing transistor T3 is configured to receive a first sensing scan signal Gate3, and 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.

[0086] The transistors used in the embodiments of the present disclosure can 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 examples. The source and drain of the transistor used here can be symmetrical in structure, so the source and drain can be indistinguishable in structure. In the embodiments of the present disclosure, in order to distinguish the two poles of the transistor except the gate, one of the poles is directly described as the first pole and the other pole is 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, Figure 3The transistor in the figure is an N-type transistor for illustration, but it is not intended to limit the present disclosure.

[0087] 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 in different time periods, wherein a display period of a frame of an image includes at least two time periods, the at least two time periods include a first time period and a second time period, at least the first light-emitting element EL1 emits light of a first color in the first time period, and at least the second light-emitting element EL2 emits light of a second color in the second time period. In the method for controlling the 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 in at least two time periods, respectively, to achieve color display.

[0088] by Figure 3 Taking the pixel circuit shown 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.

[0089] For example, Figure 4 yes Figure 3 The timing diagram of a control method of the pixel circuit shown is also a timing diagram of the working process of the pixel circuit. Figure 3 and Figure 4 , 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 light emission 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 duration of the first time period 1 and the second time period 2 may also be unequal.

[0090] refer to Figure 3 and Figure 4For 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, 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. 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.

[0091] For example, the quantum dot light-emitting element includes a first quantum dot and a second quantum dot that emit light of different colors respectively, and 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.

[0092] 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.

[0093] Specifically, refer to Figure 3 and Figure 4The display process of the first period 1 includes a first data writing and resetting phase T11 and a first light emitting phase T12. A working process or control method of the 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 scanning signal Gate2, here and below referred to as the second control signal for the convenience of description) is a closing signal, the first control signal Gate1 (i.e., the first data scanning signal Gate1, here and below referred to as the first control signal for the convenience of description) and the third control signal Gate3 (i.e., the first sensing scanning signal Gate3, here and below referred to as the third control signal for the convenience of description) are both opening signals, the first data writing transistor T1 and the first sensing transistor T3 are both turned on, and 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), and 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. Figure 5A yes Figure 4 The schematic diagram of the circuit conduction state of the first period 1 is shown in FIG. Figure 5A As shown, 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 off signals. Due to the bootstrap effect of the first storage capacitor C1, the first driving transistor T2 remains turned on and works in a saturated state with a constant current. At this time, the first control voltage VDC1 is controlled so 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. Figure 5A The first dotted line and arrow in the figure represent the first driving current CR1. Meanwhile, in the first light emitting stage T12, the second control voltage VDC2 is controlled so that VDC2-VN1>VEL2, so that the second light emitting element EL2 emits light and generates a second driving current CR2 through the first driving transistor T2 and the second light emitting element EL2. Figure 5AThe second dotted line and arrow in represent the second driving current CR2. For example, the first light-emitting element EL1 emits light of the first color, and the second light-emitting element EL2 emits light of the second color. In this way, 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, 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 light-emitting band of the second light-emitting element EL2, that is, the quantum dot light-emitting element, is selected by controlling the second control voltage VDC2, and the voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled in the 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 band of the second color of the light of the quantum dot light-emitting element is opened to make it emit light of the second color. For example, in the first light-emitting stage T12, the second color of light is red light.

[0094] In the second time period 2 after the first time period 1, the display process of the second time period 2 includes a second data writing and resetting stage T21 and a second light-emitting stage T22. A working process (control method) of the pixel circuit also includes the following steps. In the second data writing and resetting stage T21, the first control signal Gate1 is a closing signal, the second control signal Gate2 and the third control signal Gate3 are both opening 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. In the second light-emitting stage T22, the first control signal Gate1, the second control signal Gate2 and the third control signal Gate3 are all closing signals. Due to the bootstrap effect of the second storage capacitor C2, the second driving transistor T4 remains turned on, such as Figure 5B As shown, at this time, the second control voltage VDC2 is controlled so that VDC2-VN1>VEL2, so that the second light emitting element EL2 emits light and generates a third driving current CR3 through the second driving transistor T4 and the second light emitting element EL2. Figure 5BThe dotted line and arrow in represent the third driving current CR3. Thus, in the second period 2, the light emission of the second light emitting element EL2 is controlled by the second data signal Data2, that is, the grayscale of the third color is controlled by the second data signal Data2. In the second light emitting stage T22, the light emission band of the second light emitting element EL2, i.e., the quantum dot light emitting element, is selected by controlling the second control voltage VDC2, and the voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light emitting element is controlled in the second range to control the second quantum dot to emit light of the third color; for example, in the second light emitting stage T22, the band of the third color light of the quantum dot light emitting element is turned on to emit light of the third color. For example, in the second light emitting stage T22, the light of the third color is green light.

[0095] Therefore, in Figure 3-4 In the embodiment shown, a frame of display image is divided into a first time period 1 and a second time period 2, and the first light emitting element EL1 (OLED element) is controlled to emit light of a first color and the second light emitting element EL2 (quantum dot light emitting element) emits light of a second color in the first time period 1, and the second light emitting element EL2 (quantum dot light emitting element) emits light of a third color in the second time period 2, thereby achieving full-color display. In addition, in this embodiment, since a frame of display image only needs to be split into two parts, namely two stages (for example, 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.

[0096] 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 is interchanged.

[0097] 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.

[0098] exist Figure 3-4 In the illustrated embodiment, 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 different ranges of voltage difference VDC2-VN1, that is, the first range and the second range that are different from each other.

[0099] exist Figure 3-4In the illustrated embodiment, 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.

[0100] Or, in at least one embodiment, for Figure 3 In the pixel circuit shown in FIG. 1 , 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 working principle of the pixel circuit to realize color display is the same as that of FIG. Figure 3 Similar to the embodiment shown, the structure and control method of the pixel circuit can refer to the previous Figure 3-4 In the description of the embodiment shown, the first light emitting element EL1 and the second light emitting element EL2 are adaptively interchanged, and the principles are the same, which will not be repeated here.

[0101] Or, in at least one embodiment, for Figure 3 In the pixel circuit shown, 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, light of a second color and light of 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 Figure 4 The description also includes a first period 1 and a second period 2, but the working process of the pixel circuit is the same as Figure 4There are the following differences. 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 the first light-emitting stage T12, the light-emitting band of the first light-emitting element EL1, i.e., the first quantum dot light-emitting element, is selected by controlling the first control voltage VDC1, so that the first quantum dot of the first light-emitting element EL1 emits light of a first color; at the same time, in the first light-emitting stage T12, the light-emitting band of the second light-emitting element EL2, i.e., the second quantum dot light-emitting element, is selected by controlling the second control voltage VDC2, so that the second quantum dot of the second light-emitting element EL2 emits light of a first color. For example, the light of the first color is blue light, and the light of the second color is red light. In the second light-emitting stage T22, the light-emitting band of the second light-emitting element EL2, i.e., the second quantum dot light-emitting element, is selected by controlling the second control voltage VDC2, so that the third quantum dot of the second light-emitting element EL2 emits light of a third color. For example, the light of the third color is green light. The working process of the first data writing and reset stage T11 of the first period 1 and the second data writing and reset stage T21 of the second period 2 is the same as previously described. Figure 4 The same as the description of . In this way, this embodiment can also achieve full-color display by dividing a frame of display image into a first time period 1 and a second time period 2, controlling the first light-emitting element EL1 to emit light of the first color and the second light-emitting element EL2 to emit light of the second color in the first time period 1, and the second light-emitting element EL2 to emit light of the third color in the second time period 2. Moreover, in this embodiment, since a frame of display image only needs to be split into two parts, namely two stages (for example, 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.

[0102] For example, Figure 6 yes Figure 3 A timing diagram of another control method of the pixel circuit shown; Fig. 7A yes Figure 6 The schematic diagram of the circuit conduction state in the first time period 1 is shown; Figure 7B yes Figure 6 The schematic diagram of the circuit conduction state in the second time period 2 shown; Figure 7C yes Figure 6 Schematic diagram of the circuit conduction state in the third time period 3 is shown.

[0103] 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.

[0104] For example, in Figure 6 and Figures 7A-7CIn the illustrated embodiment, 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.

[0105] For example, refer to Figure 6 , 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, namely, 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 light-emitting 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 may also be unequal.

[0106] exist Figure 6 and Figures 7A-7C In the illustrated embodiment, 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, and the quantum dot light emitting element includes a first quantum dot and a second quantum dot that emit light of different colors, respectively. The following is an example in which the first light emitting element EL1 is an OLED element and the second light emitting element EL2 is a quantum dot light emitting element.

[0107] Specifically, refer to Figure 3 and Figure 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 the 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 scanning signal Gate2, here and below for the convenience of description as the second control signal) is a closing signal, the first control signal Gate1 (i.e., the first data scanning signal Gate1, here and below for the convenience of description as the first control signal) and the third control signal Gate3 (i.e., the first sensing scanning signal Gate3, here and below for the convenience of description as the third control signal) are both opening 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 through the first data writing transistor T1, for example, the 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 through the 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 working voltage. Fig. 7A Yes Figure 4 is a schematic diagram of the circuit conduction state of the first time period 1 as shown in Fig. 7A As shown, 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 off signals. Due to the bootstrap effect of the first storage capacitor C1, the first driving transistor T2 remains conducting 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. Fig. 7A The dashed line and arrow in indicate 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 causing the second light-emitting element EL2 not to emit 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, and the light-emitting 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.

[0108] After the first time period 1, in the second time period 2, the display process of the second time period 2 includes a second data writing and reset stage T21 and a second light-emitting stage T22. A working process (control method) of this pixel circuit further includes the following steps. In the second data writing and reset stage 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 conducting, and the second data signal Data2 is transmitted through the second data writing transistor T5 to the gate of the second driving transistor T4. For example, a first reset signal Sense1 is written to the second electrode of the second light-emitting element EL2 through the analog-to-digital converter via the first sensing signal line SENSE1 and the first sensing transistor T3. In the second light-emitting stage 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 conducting, as Figure 7B shown. At this time, the second control voltage VDC2 is controlled such that VDC2 – VN1 > VEL2, thereby causing the second light-emitting element EL2 to emit light and generating a second driving current CR2 passing through the second driving transistor T4 and the second light-emitting element EL2. Figure 7BThe dotted line and arrow in represent the second driving current CR2; for example, in the second light-emitting stage T22, the second light-emitting element EL2 emits light of a second color, which is different from the first color. Thus, in the second period 2, the light emission of the second light-emitting element EL2 is controlled by the second data signal Data2, that is, the grayscale of the second color is controlled by the second data signal Data2. In the second light-emitting stage T22, the light-emitting band of the second light-emitting element EL2, i.e., the quantum dot light-emitting element, is selected by controlling the second control voltage VDC2, and the voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled in the second range to control the second quantum dot to emit light of the second color; for example, in the second light-emitting stage T22, the band of the second color of light of the quantum dot light-emitting element is turned on to emit light of the second color. For example, in the second light-emitting stage T22, the second color of light is red light.

[0109] In the third time period 3 after the second time period 2, the display process of the third time period 3 includes a third data writing and resetting 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 resetting stage T31, the first control signal Gate1 is a closing signal, the second control signal Gate2 and the third control signal Gate3 are both opening 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. In the third light-emitting stage T32, the first control signal Gate1, the second control signal Gate2 and the third control signal Gate3 are all closing signals. Due to the bootstrap effect of the second storage capacitor C2, the second driving transistor T4 remains turned on, such as Figure 7B As shown, at this time, the second control voltage VDC2 is controlled so that VDC2-VN1>VEL2, so that the second light emitting element EL2 emits light and generates a third driving current CR3 through the second driving transistor T4 and the second light emitting element EL2. Figure 7CThe dotted line and arrow in represent the third driving current CR3; for example, in 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 color and the second color. Thus, in the third period 3, the light emission of the second light-emitting element EL2 is also controlled by the second data signal Data2, that is, the grayscale of the third color is also controlled by the second data signal Data2. In the third light-emitting stage T32, the light-emitting band of the second light-emitting element EL2, i.e., the quantum dot light-emitting element, is selected by controlling the second control voltage VDC2, and the voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled in the 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 band of the third color light of the quantum dot light-emitting element is turned on to emit light of a third color. For example, in the third light-emitting stage T32, the third color light is green light.

[0110] Above Figure 6 In the process shown, in the period when the first light-emitting element EL1 emits light, the circuit on the left works (that is, the first light-emitting element EL1 is driven to emit light by the first driving transistor T2), and the voltage of the first node N1 is the voltage Vdc when the first data signal Data1 is written, and the voltage of the first node N1 is greater than Vdc when the first light-emitting element EL1 emits light, and the second light-emitting element EL2 is reverse biased, thereby ensuring that the second light-emitting element EL2 does not emit light; and in the period when the second light-emitting element EL2 is driven to emit light, when the second data signal Data2 is written, the voltage of the first node N1 is the voltage Vdc, and the voltage of the first node N1 is less than Vdc when the second light-emitting element EL2 emits light, thereby ensuring that the first light-emitting element EL1 is reverse biased, ensuring that the first light-emitting element EL1 does not emit light, thereby, in Figure 3 and Figure 6 In the illustrated embodiment, a frame of display image is divided into a first time period 1, a second time period 2 and a third time period 3, so that the first light-emitting element EL1 (OLED element) emits light of a first color in the first time period 1, and the second light-emitting element EL2 (quantum dot light-emitting element) emits light of a second color in the second time period 2, and the second light-emitting element EL2 (quantum dot light-emitting element) emits light of a third color in the third time period 3. In the process of controlling the pixel circuit to display, the light-emitting operations of the two light-emitting elements emitting three colors do not interfere with each other, thereby achieving full-color display.

[0111] 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, which is easier to implement without satisfying VDC2-VN1>VEL1 and VDC2-VN1>VEL2 at the same time, thereby reducing the implementation difficulty. On the other hand, the OLED element and the quantum dot light-emitting element are of different types and the light emission control of the two is achieved by controlling the first control voltage VDC1 and the second control voltage VDC2 respectively. Therefore, the light emission control of the two is relatively independent, thereby not only reducing the implementation difficulty, but also facilitating 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.

[0112] 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.

[0113] For example, in Figure 3 and Figure 6 In the pixel circuit and control method thereof shown, the first control voltage terminal and the second control voltage terminal may be the same control voltage terminal, that is, the second control voltage VDC2 and the first control voltage VDC1 may be the same voltage signal. Because the time period for adjusting the voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element and the time period for adjusting the voltage difference VN1-VDC1 between the first electrode and the second electrode of the OLED element are different time periods and are independent, the above requirements for the two voltage differences can be achieved by using the same control voltage terminal, so as to simplify the structure of the pixel circuit and simplify the control method.

[0114] Likewise, in Figure 3 and Figure 6 In the illustrated 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 may also be adjusted according to specific needs.

[0115] For example, in at least one other embodiment, for Figure 3In the pixel circuit shown in the figure, the first light emitting element EL1 and the second light emitting element EL2 can both be quantum dot light emitting elements, and the two quantum dot light emitting elements include a first quantum dot, a second quantum dot and a third quantum dot in total. In this case, the at least two light emitting periods of the control method of the pixel circuit can also include a first period, a second period and a third period. The control method of the pixel circuit is the same as Figure 6 The control method shown has the following differences.

[0116] For example, in the case where both the first light-emitting element EL1 and the second light-emitting element EL2 can be quantum dot light-emitting elements, the control method of the pixel circuit includes: in the first period, controlling the first quantum dot to emit light of the first color; in the second period, controlling the second quantum dot to emit light of the second color; in the third period, controlling the third quantum dot to emit light of the third color. For example, the first of the first light-emitting element EL1 and the second light-emitting element EL2 includes the first quantum dot, and the second of the first light-emitting element EL1 and the second light-emitting element EL2 includes the second quantum dot and the third quantum dot. The control method of the pixel circuit includes: in one period of the first period, the second period and the third period, controlling the first of the first light-emitting element EL1 and the second light-emitting element EL2 to emit light of the first color, that is, making the first quantum dot emit light of the first color; and in the other two periods of the first period, the second period and the third period, controlling the second of the first light-emitting element EL1 and the second light-emitting element EL2 to emit light of the second color and light of the third color respectively, that is, making the second quantum dot and the third quantum dot emit light of the second color and light of the third color respectively, the first color, the second color and the third color are different from each other, so as to achieve full-color display.

[0117] 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.

[0118] For example, the working timing of the pixel circuit of this embodiment is similar to Figure 6 Same as shown in reference Figure 6In 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.

[0119] Figure 8 is a schematic diagram of another pixel circuit provided by an embodiment of the present disclosure. Figure 8 The structure of the pixel circuit shown is similar to Figure 3 The differences shown are as follows. Figure 8 As shown, the second end of the second storage subcircuit 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. Figure 8 The pixel circuit shown can be implemented with Figure 3 The pixel circuit shown in FIG. has the same or similar technical effect, and its working process or control method can refer to the Figure 3 The description of the pixel circuit shown is not repeated here.

[0120] The following is an introduction to the detection and compensation process of the pixel circuit provided by at least one embodiment of the present disclosure.

[0121] Fig. 9A 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 Figure 3 The pixel circuit shown is electrically connected to a first external detection circuit OC. Fig. 9A, 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 the aging of the light-emitting element. For example, the parameters that affect the light-emitting result of the light-emitting element due to the aging of the light-emitting element may be the gate-source voltage Vgs of the driving transistor, or may be the driving current flowing through the light-emitting element. The driving transistor described herein includes the first driving transistor T2 and / or the second driving transistor T4, and the light-emitting element includes the first light-emitting element EL1 and / or the second light-emitting element EL2.

[0122] 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.

[0123] 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".

[0124] 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.

[0125] 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 a first color and a second color; and in a second time period, writing a second data signal Data2 for controlling the grayscale of a third color. In a 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 emission of both is controlled by the first data signal Data1. In a second light-emitting stage, the second light-emitting element EL2 emits light of the third color, and the light emission 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. In the first compensation period, the electrical characteristics of the pixel circuits driving the first light-emitting element EL1 (OLED element) emitting the first color light and the second light-emitting element EL2 (quantum dot light-emitting element) emitting the second color light are detected respectively, and the detected electrical characteristics are converted into digital signals respectively. For example, according to the digital signal, the light emission conditions of the OLED element and the quantum dot light-emitting element are compensated simultaneously through the first data signal Data1, including compensating for the aging conditions of the OLED element and the quantum dot light-emitting element at the same time, and may also include compensating 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 the first color light may include the threshold voltage of the first driving transistor T2 The threshold voltage and / or carrier mobility, and parameters that affect 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 may 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 parameters that affect 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 may 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 emission 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 emission 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 it may be the driving current flowing through the second light-emitting element EL2.

[0126] In some other embodiments of the present disclosure, for example, in the above Figure 6In the case where a frame of image shown 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 a control method for a pixel circuit includes: in a first compensation period, detecting an electrical characteristic of a pixel circuit that drives a first light-emitting element that emits light of a first color, converting the detected electrical characteristic 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 characteristic may include a threshold voltage and / or carrier mobility of a 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 a second compensation period, detecting an electrical characteristic of a pixel circuit that drives a second light-emitting element that emits light of a second color, converting the detected electrical characteristic 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. The light emission of the second light-emitting element is compensated by the second data signal, wherein the electrical characteristic may include the threshold voltage and / or carrier mobility of the second driving transistor T4, and a parameter affecting the light emission result of the second light-emitting element EL2 due to 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; and in the third compensation period, the electrical characteristic of the pixel circuit driving the second light-emitting element to emit light of the third 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, wherein the electrical characteristic may include the threshold voltage and / or carrier mobility of the second driving transistor T4, and a parameter affecting the light emission result of the second light-emitting element EL2 due to 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.

[0127] Specifically, for example, Fig. 9B yes Fig. 9A An example of a pixel circuit connected to a first external detection circuit is shown, Fig.10 yes Fig. 9A A timing diagram of the compensation process of the pixel circuit shown.

[0128] refer to Fig. 9B and Fig.10 , for example, Fig. 9BThe compensation process of the pixel circuit shown includes a first compensation period 1, a second compensation period 2 and a third compensation period 3, in which light-emitting elements emitting three colors of light are compensated respectively. For example, the first light-emitting element EL1 is an OLED element, and the second light-emitting element EL2 is a quantum dot light-emitting element, which includes a first quantum dot and a second quantum dot that can be excited to emit light of different colors respectively. The detection and compensation method of the pixel circuit is described below using this as an example. Here, Fig. 9B and Fig.10 Take the current sensing of both the OLED element and the quantum dot light-emitting element as an example. When current sensing is performed, the first control signal Gate1 and the third control signal Gate3 can be both on signals or both off signals in each time period. Therefore, the first control signal Gate1 and the third control signal Gate3 can come from the same control signal terminal, so that the first control signal Gate1 and the third control signal Gate3 can be provided through the same signal line, thereby saving a scanning signal line, that is, saving a gate line, simplifying the structure of the display substrate, and reducing the difficulty of manufacturing and controlling the display substrate.

[0129] In other embodiments, during the detection and compensation stage, 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.

[0130] For example, Fig.10 The detection phase shown can be performed in a blanking phase between display phases, or during power-off time to avoid affecting the display.

[0131] Combination Fig. 9B and Fig.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 shut-down 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 into the gate of the first driving transistor T2, for example, the first data signal Data1 is a Vdata signal, and 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 and the second ... The control signal Gate2 is a shut-down signal, the third control signal Gate3 remains a shut-down 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 a shut-down 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, and the aging of the OLED element is compensated through the first data signal Data1 according to the digital signal; 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 shut-down signals.

[0132] For example, in the first compensation period 1, the on-time of the OLED element is longer than the on-time of emitting light in actual operation, so that it has enough emitting time, thereby making the aging degree of the detected OLED element (ie, the first light-emitting element EL1) accurate.

[0133] 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.

[0134] Combination Fig. 9B and Fig.10, in the second compensation period 2, the light emission of the second light emitting element EL2 emitting the second color light 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 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. 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 by 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 according to the digital signal through the second data signal Data2; 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.

[0135] Combination Fig. 9B and Fig.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 the third color light 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 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 Vdata3 signal. For example, the Vdata3 signal here is different from 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 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 T31 of the third compensation period 3 T32, the first 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 by the second power supply voltage VSS, and 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 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 according to the digital signal through the second data signal Data2; 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.

[0136] 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 is simulated by multiplying the opening time of each light-emitting element by the brightness, and grayscale compensation is performed according to the simulated curve. This will not be repeated here. 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.

[0137] 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.

[0138] It should be noted that Fig. 9B and Fig.10 The embodiment shown is a pixel circuit provided by the embodiment of the present disclosure, taking current sensing as an example. Figure 3 However, in other embodiments, the pixel circuit may be detected and compensated by a voltage sensing method. Similarly, the pixel circuit may be divided into at least two compensation periods corresponding to the display period. For example, when voltage sensing is performed, the first compensation period, the second compensation period and the third compensation period are also included. This situation is different from the above Fig. 9B and Fig.10 The difference between the detection and compensation of the embodiment shown 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 driving 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, this situation is different from the above Fig. 9B and Fig.10 The difference between the detection and compensation of the illustrated embodiment 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 the 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 that controls the display grayscale.

[0139] It should be noted that, regardless of whether voltage sensing or current sensing is used, for the supplement of the pixel circuit of the present invention, for each compensation stage, compensation can be made 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. Alternatively, 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.

[0140] Fig.11 is a schematic diagram of another pixel circuit provided by an embodiment of the present disclosure, Fig.12 yes Fig.11 A timing diagram of a control method for a pixel circuit is shown. Fig.11 The pixel circuit shown is Figure 3 The following differences are shown. Fig.11For 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), 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 subpixel to which it belongs through the second external detection circuit in response to the second sensing scan signal Gate4 to achieve external compensation.

[0141] refer to Fig.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, 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 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.

[0142] The first electrode of the second sensing transistor T6 is electrically connected to the first node, the 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, the gate of the second sensing transistor T6 is configured to receive the 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.

[0143] Fig.12 The working process (or control method) of the pixel circuit shown in FIG. Figure 6 Similarly, the control method of the pixel circuit also includes: in the first time period 1, writing the first data signal Data1 for controlling the grayscale of the first color; and in the second time period 2 and the third time period 3, writing the second data signal Data2 for controlling the grayscale of the second color and the third color respectively; that is, a frame of image includes the first time period 1, the second time period 2 and the third time period 3. For example, a frame of image is divided into three time periods, namely, 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 that in the second time period 2. Figure 6 The working process of the first period shown is the same, and reference may be made to the previous description. Fig.12The working process of the pixel circuit shown is similar to Figure 6 The shown ones have the following differences.

[0144] Fig.11 and Fig.12 In the illustrated embodiment, the reset in the second time period 2 and the third time period 3 is achieved through a sensing sub-circuit 4A and a first sensing signal line SENSE1, and the reset in the second time period 2 and the third time period 3 is achieved through a second sensing sub-circuit 4B and a second sensing signal line SENSE2, rather than through the first sensing sub-circuit 4A and the first sensing signal line SENSE1.

[0145] Specifically, refer to Fig.11 and Fig.12 In the first period 1, the second sensing scan signal Gate4 (ie, the fourth control signal Gate4, here and hereinafter referred to as the second sensing scan signal Gate4 is the fourth control signal Gate4) remains turned off; in the second period 2 and the third period 3, the third control signal Gate3 remains turned off.

[0146] refer to Fig.11 and Fig.12, the display process of the second period 2 includes a second data writing and resetting stage T21 and a second light emitting stage T22. In the second data writing and resetting stage T21, the first control signal Gate1 is a closing signal, the second control signal Gate2 and the fourth control signal Gate4 are both opening 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, the first reset signal Sense1 is written to the second electrode of the second light emitting element EL2 through the second external detection circuit through the second sensing signal line SENSE2 and the second sensing transistor T6. In the second light-emitting stage 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, so that the second light-emitting element EL2 emits light and generates a second driving current through the second driving transistor T4 and the second light-emitting element EL2; for example, in the second light-emitting stage T22, the second light-emitting element EL2 emits light of a second color, which is different from the first color. In this way, in the second period 2, the light emission of the second light-emitting element EL2 is controlled by the second data signal Data2, that is, the grayscale of the second color is controlled by the second data signal Data2. In the second light-emitting stage T22, the light-emitting wavelength band of the second light-emitting element EL2 (for example, a quantum dot light-emitting element) is selected by controlling the second control voltage VDC2, and the voltage difference VDC2-VN1 between the first electrode and the second electrode of the quantum dot light-emitting element is controlled in the second range to control the second quantum dot to emit light of the second color; for example, in the second light-emitting stage T22, the wavelength band of the second color light of the quantum dot light-emitting element is turned on to emit light of the second color. For example, in the second light-emitting stage T22, the second color light is red light.

[0147] In the third period 3 after the second period 2, the display process of the third period 3 includes a third data writing and resetting 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 resetting stage T31, the first control signal Gate1 is a closing signal, the second control signal Gate2 and the fourth control signal Gate4 are both opening 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, the first reset signal Sense1 is written to the second electrode of the second light-emitting element EL2. In 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, so that the second light-emitting element EL2 emits light and generates a third driving current through the second driving transistor T4 and the second light-emitting element EL2; for example, in the third light-emitting stage T32, the second light-emitting element EL2 emits a third color of light, and the third color is different from the first color and the second color. In this way, in the third period 3, the light emission of the second light-emitting element EL2 is also controlled by the second data signal Data2, that is, the grayscale of the third color is also controlled by the second data signal Data2. In the third light-emitting stage T32, the light-emitting wavelength band of the second light-emitting element EL2, i.e., the quantum dot light-emitting element, is selected by controlling the second control voltage VDC2, and 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 band of the third color light of the quantum dot light-emitting element is turned on to emit light of a third color. For example, in the third light-emitting stage T32, the third color light is green light.

[0148] Likewise, in Fig.11 and Fig.12 In the illustrated embodiment, the first color, the second color, and the third color are not limited to the listed types.

[0149] For example, for Fig.12The pixel circuit shown, 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.

[0150] In addition, for Fig.11 In the process of detecting and compensating the pixel circuit shown, at least two compensation periods can refer to the description in the previous embodiment, but different sensing subcircuits and sensing signal lines can be used to respectively perform detection for the purpose of compensating the light emission of the first light-emitting element and the second light-emitting element. For example, in some embodiments, in the detection for the purpose of compensating the light emission of the first light-emitting element, the reset signal Sense can be input through the first sensing subcircuit 4A and the first sensing signal line SENSE1, and in the detection for the purpose of compensating the light emission of the second light-emitting element, the reset signal Sense can be input through the second sensing subcircuit 4B and the second sensing signal line SENSE2. Of course, it is not limited to this case. For example, in other embodiments, in the detection for the purpose of compensating the light emission of the first light-emitting element, the reset signal Sense can also be input through the second sensing subcircuit 4B and the second sensing signal line SENSE2, and in the detection for the purpose of compensating the light emission of the second light-emitting element, the reset signal Sense can be input through the first sensing subcircuit 4A and the first sensing signal line SENSE1.

[0151] Fig.11 and Fig.12 For other features not mentioned in the illustrated embodiment, reference may be made to the description of the previous embodiments.

[0152] 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. Figure 2 , the display panel includes Figure 2 The display substrate shown, such as a display panel, may also include a packaging layer and other structures. For example, the display panel may be a flexible panel or a rigid panel. For example, referring to Figure 2 The display panel includes a plurality of sub-pixels arranged in an array in 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.

[0153] Fig.13A is a structural schematic diagram of a first light-emitting element and a second light-emitting element of a pixel circuit provided by an embodiment of the present disclosure. Fig.13AFor example, the 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. There is no limitation on the specific film type of the substrate 01. 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 on the main surface perpendicular to 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. Reference Fig.13A 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 a 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 a 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, Fig.13A In the embodiment, the second electrode 1b of the first light emitting element EL1 is located on the side of the first electrode 1a of the first light emitting element EL1 close to the substrate 01; the second electrode 2b of the second light emitting element EL2 is located on the side of the first electrode 2a of the second light emitting element EL2 close 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 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 EL1 emits light of the first color, and in the second time period, at least the second light emitting element EL2 emits light of the second color.

[0154] For example, in Fig.13A In the embodiment, the first electrode 1a of the first light emitting element EL1 and the second electrode 2b of the second light emitting element EL2 form an integrated common electrode, and the integrated common electrode refers to an integrated structure with uniform material, no seams, and no joint surface. For example, the material of the common electrode is a transparent conductive material, such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0155] For example, Fig.13AThe overall structure formed by the first light-emitting element EL1 and the second light-emitting element EL2 shown is a top emission type. Among the film layers stacked on each other 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 is 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 the transmittance, such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0156] 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.

[0157] Fig. 13B 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, Fig. 13B As shown, 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, the two are attached to each other to be electrically connected. 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.

[0158] 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; Fig.14 In the figure, 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.

[0159] 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, a plurality of first quantum dots Q1 and a plurality of second quantum dots Q2 are distributed alternately to improve the uniformity of light emission of the entire quantum dot light-emitting layer. For example, in each quantum dot sublayer, along the first direction and the second direction that intersect 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, a plurality of first quantum dots Q1 and a plurality of second quantum dots Q2 are distributed alternately, evenly alternately, 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 of the entire quantum dot light-emitting layer.

[0160] Fig. 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, Fig. 13C In the illustrated embodiment, the overall structure formed by the first light emitting element EL1 and the second light emitting element EL2 is a bottom emission type. 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. Light is emitted from the substrate 01.

[0161] Fig.14 is a schematic diagram of a display device provided by an embodiment of the present disclosure. Fig.14 At least one embodiment of the present disclosure further provides a display device 100, and the display device 100 includes any one of the display substrates 10 provided in the embodiments of the present disclosure. The display device can be, for example, a display panel, or a display, an OLED panel, an OLED TV, an electronic paper, a mobile phone, a tablet computer, a notebook computer, a digital photo frame, a navigator, or any other product or component with a display function. Of course, the display device provided in the embodiments of the present disclosure is not limited to the types listed above.

[0162] Accordingly, the display panel and the display device provided by the embodiments of the present disclosure both have the technical effects of the pixel circuit and the display substrate provided by the embodiments of the present disclosure.

[0163] There are a few points to note:

[0164] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0165] (2) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0166] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope 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 claim 1, 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 the 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 claim 5, 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, 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, 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, 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 21, 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, 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.

Images