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

Abstract

The application relates to a pixel circuit and a driving method thereof, a display panel and a display device. The pixel circuit comprises a driving transistor, a light-emitting control module connected with a first electrode and a second electrode of the driving transistor respectively, a threshold value compensation module, a coupling module, and a first end of the light-emitting control module is used for receiving a light-emitting control signal, the threshold value compensation module is used for receiving a first scanning signal, a first end of the threshold value compensation module is connected with the second electrode of the driving transistor, a second end of the threshold value compensation module is connected with a gate electrode of the driving transistor, a first end of the coupling module is used for receiving a second scanning signal, and a second end of the coupling module is connected with a target electrode of the driving transistor, so that the potential of the target electrode of the driving transistor is changed in response to the second scanning signal, wherein the target electrode is one of the first electrode and the second electrode of the driving transistor. The pixel circuit can improve the flicker problem of the display panel when high and low frequency switching is performed.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a pixel circuit and its driving method, a display panel, and a display device. Background Technology

[0002] Active matrix organic light-emitting diode (OLED) displays emit light by being driven by current. Therefore, the characteristics of TFT devices directly affect the grayscale brightness differences of the display device. When the characteristics of TFT devices in different sub-pixels differ too much, it can easily lead to uneven image quality, such as producing mura (i.e., uneven brightness of the display, causing various marks).

[0003] To address the aforementioned issues, existing display devices can improve the brightness uniformity of the entire display screen by internally compensating the threshold voltage Vth of the pixel circuit. However, during high-frequency switching, the stress on the driving transistors differs between the high and low frequencies, resulting in differences in the characteristics of the driving transistors. Consequently, the driving current differs under the same data voltage, causing flickering on the display panel during high-frequency switching. Summary of the Invention

[0004] Therefore, it is necessary to provide a pixel circuit and its driving method, display panel, and display device that can improve the flickering problem of display panels when switching between high and low frequencies, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a pixel circuit, comprising:

[0006] A driving transistor is used to provide driving current to a light-emitting device;

[0007] The light emission control module is connected to the first and second terminals of the driving transistor respectively, and is used to respond to the light emission control signal to enable the driving transistor to form a driving current path;

[0008] A threshold compensation module, wherein the control terminal of the threshold compensation module is used to receive a first scan signal, the first terminal of the threshold compensation module is connected to the second terminal of the driving transistor, and the second terminal of the threshold compensation module is connected to the gate of the driving transistor;

[0009] A coupling module, wherein a first end of the coupling module is used to receive a second scan signal, and a second end of the coupling module is connected to the target electrode of the driving transistor, and is used to respond to the second scan signal to cause a coupling change in the potential of the target electrode of the driving transistor to increase the potential of the target electrode of the driving transistor, wherein the target electrode is one of the first electrode and the second electrode of the driving transistor.

[0010] The aforementioned pixel circuit receives the second scan signal through the first end of the coupling module and connects the second end of the coupling module to the target electrode of the driving transistor. This allows the coupling module to respond to the second scan signal, causing a coupling change in the potential of the target electrode of the driving transistor, thereby increasing the potential of the target electrode of the driving transistor. When the driving transistor is turned on, the potentials of the first and second electrodes of the driving transistor are the same and at a high potential. This improves the difference in stress experienced by the driving transistor under the write frame and hold frame, ensuring that the state of the driving transistor is consistent between the write frame and hold frame. This can improve the flickering problem that occurs when the display panel switches between high and low frequencies.

[0011] In one embodiment, the coupling module includes a coupling capacitor, a first end of which is used to receive the second scan signal, and a second end of which is connected to the first terminal of the driving transistor.

[0012] In one embodiment, the coupling module includes a coupling capacitor, a first end of which is used to receive the second scan signal, and a second end of which is connected to the second terminal of the driving transistor.

[0013] In one embodiment, the coupling module further includes a coupling capacitor, a first transistor, and a second transistor. The first terminals of the first transistor and the second transistor are respectively connected to the first terminal of the coupling capacitor, and the second terminal of the coupling capacitor is connected to the target terminal of the driving transistor. The gate of the first transistor is used to receive a light emission control signal, the second terminal of the first transistor is used to receive a first reset signal, the gate of the second transistor is used to receive a second scan signal, and the second terminal of the second transistor is used to receive an adjustment voltage.

[0014] In one embodiment, the pixel circuit further includes a first storage module, a first terminal of which is used to receive a first power supply voltage, and a second terminal of which is connected to the first electrode of the driving transistor for storing data voltage.

[0015] In one embodiment, the first storage module includes a first storage capacitor, a first terminal of which is used to receive the first power supply voltage, and a second terminal of which is connected to the first terminal of the driving transistor.

[0016] In one embodiment, the pixel circuit further includes:

[0017] The second storage module has a first terminal for receiving the first power supply voltage and a second terminal connected to the gate of the driving transistor for storing data voltage containing threshold voltage information.

[0018] In one embodiment, the second storage module includes a second storage capacitor, a first terminal of which is used to receive a first power supply voltage, and a second terminal of which is connected to the first terminal of the driving transistor.

[0019] In one embodiment, the light emission control module includes a first light emission control submodule and a second light emission control submodule;

[0020] The control terminal of the first light-emitting control submodule is used to receive light-emitting control signals, the first terminal of the first light-emitting control submodule is used to receive the first power supply voltage, and the second terminal of the first light-emitting control submodule is connected to the first electrode of the driving transistor.

[0021] The control terminal of the second light-emitting control submodule is used to receive the light-emitting control signal. The first terminal of the second light-emitting control submodule is connected to the second electrode of the driving transistor, and the second terminal of the second light-emitting control submodule is connected to the anode of the light-emitting device.

[0022] In one embodiment, the pixel circuit further includes: a writing module, a first reset module, and a second reset module;

[0023] The control terminal of the writing module is used to receive the third scan signal, the first terminal of the writing module is used to receive the data voltage, and the second terminal of the writing module is connected to the first electrode of the driving transistor.

[0024] The control terminal of the first reset module is used to receive the fourth scan signal, the first terminal of the first reset module is used to receive the first reset signal, and the second terminal of the first reset module is connected to the gate of the driving transistor.

[0025] The control terminal of the second reset module is used to receive the third scan signal, the first terminal of the second reset module is used to receive the second reset signal, and the second terminal of the second reset module is connected to the anode of the light-emitting device.

[0026] In one embodiment, the write module includes a third transistor, the gate of which is used to receive the third scan signal, the first terminal of which is used to receive a data voltage, and the second terminal of which is connected to the first terminal of the drive transistor;

[0027] The first light emission control submodule includes a fourth transistor, the gate of which is used to receive the light emission control signal, the first terminal of which is used to receive the first power supply voltage, and the second terminal of which is connected to the first terminal of the driving transistor.

[0028] The second light-emitting control submodule includes a fifth transistor, the gate of which is used to receive the light-emitting control signal, the first terminal of which is connected to the second terminal of the driving transistor, and the second terminal of which is connected to the anode of the light-emitting device.

[0029] The first reset module includes a sixth transistor, the gate of which is used to receive the fourth scan signal, the first terminal of which is used to receive the first reset signal, and the second terminal of which is connected to the gate of the driving transistor.

[0030] The second reset module includes a seventh transistor, the gate of which is used to receive the third scan signal, the first electrode of which is used to receive the second reset signal, and the second electrode of which is connected to the anode of the light-emitting device;

[0031] The threshold compensation module includes an eighth transistor, the control terminal of which is used to receive the first scan signal, the first terminal of which is connected to the second terminal of the driving transistor, and the second terminal of which is connected to the gate of the driving transistor.

[0032] In one embodiment, the sixth transistor and the eighth transistor are indium gallium zinc oxide thin-film transistors, and the driving transistor, the third transistor, the fourth transistor, the fifth transistor, and the seventh transistor are low-temperature polycrystalline silicon thin-film transistors.

[0033] Secondly, this application also provides a driving method for a pixel circuit, the pixel circuit including a driving transistor, a light emission control module, a threshold compensation module and a coupling module, wherein the first end of the coupling module is used to receive a second scanning signal, and the second end of the coupling module is connected to the target electrode of the driving transistor, the target electrode being one of the first electrode and the second electrode of the driving transistor;

[0034] The driving method includes: a first writing phase, a first reset phase, and a first light emission phase;

[0035] In the first writing stage, the threshold compensation module responds to the first scan signal, causing the data voltage to be written into the gate of the driving transistor via the first and second terminals of the driving transistor, thereby completing the threshold voltage compensation of the driving transistor.

[0036] In the first reset phase, the coupling module responds to the second scan signal to cause a coupling change in the potential of the target electrode of the driving transistor, thereby increasing the potential of the target electrode of the driving transistor; the first electrode and the second electrode of the driving transistor are reset under the action of the first reset signal;

[0037] In the first light-emitting stage, the light-emitting control module responds to the light-emitting control signal, causing the first and second terminals of the driving transistor to be connected to voltage respectively, forming a driving current path, and the driving transistor provides driving current to the light-emitting device.

[0038] The aforementioned pixel circuit driving method, in the first writing stage, uses a threshold compensation module to respond to a first scan signal, causing the data voltage to be written to the gate of the driving transistor via the first and second electrodes, thus compensating for the threshold voltage of the driving transistor and improving the display uniformity of the display panel. Based on this, in the first reset stage, a coupling module responds to a second scan signal, causing a coupling change in the potential of the target electrode of the driving transistor, increasing the potential of the target electrode. This ensures that when the driving transistor is turned on, the potentials of the first and second electrodes of the driving transistor are the same and at a high potential, mitigating the stress difference between the driving transistor in the write frame and the hold frame, ensuring that the state of the driving transistor is consistent between the write frame and the hold frame. Therefore, while ensuring the display uniformity of the display panel in the first light-emitting stage, it can also improve the flickering problem that occurs when the display panel switches between high and low frequencies.

[0039] In one embodiment, the driving method further includes a second reset phase and a second light emission phase;

[0040] In the second reset phase, the first and second terminals of the driving transistor are reset under the action of the data voltage, the anode of the light-emitting device is reset under the action of the second reset signal, and the coupling module responds to the second scan signal to cause the potential of the target terminal of the driving transistor to undergo a coupling change again, so as to increase the potential of the target terminal of the driving transistor.

[0041] In the second light-emitting stage, the light-emitting control module responds to the light-emitting control signal, causing the first and second terminals of the driving transistor to be connected to voltage respectively, forming a driving current path, and the driving transistor provides driving current to the light-emitting device.

[0042] In one embodiment, the pixel circuit further includes a first storage module, a first terminal of which is used to receive a first power supply voltage, and a second terminal of which is connected to the first electrode of the driving transistor; the driving method further includes a second write stage.

[0043] During the first write phase, the first terminal of the first storage module receives a first power supply voltage, and the second terminal of the first storage module receives a data voltage to store the data voltage.

[0044] During the second write phase, the first storage module charges the gate of the driving transistor to increase the potential of the gate of the driving transistor.

[0045] Thirdly, this application also provides a display panel, including a light-emitting device and a pixel circuit as described above, wherein the pixel circuit is connected to the light-emitting device and is used to drive the light-emitting device to emit light.

[0046] The aforementioned display panel includes the aforementioned pixel circuit. The first end of the coupling module of the pixel circuit receives the second scan signal and connects the second end of the coupling module to the target electrode of the driving transistor. This allows the coupling module to respond to the second scan signal and cause a coupling change in the potential of the target electrode of the driving transistor, thereby increasing the potential of the target electrode of the driving transistor. When the driving transistor is turned on, the potentials of the first and second electrodes of the driving transistor are the same and at a high potential. This improves the difference in stress experienced by the driving transistor under the write frame and the hold frame, ensuring that the state of the driving transistor is consistent under the write frame and the hold frame. Thus, when the pixel circuit drives the light-emitting device to emit light, the flickering problem that occurs when the display panel switches between high and low frequencies can be improved.

[0047] Fourthly, this application provides a display device, including the display panel described above.

[0048] The advantages of the aforementioned display device over existing technology are the same as the advantages of the aforementioned display panel over existing technology, and will not be repeated here. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the existing 7T1C pixel circuit.

[0051] Figure 2 This is a schematic diagram of the pixel circuit in one embodiment;

[0052] Figure 3 This is a schematic diagram illustrating the distinction between write frames and hold frames in one embodiment;

[0053] Figures 4-12 These are schematic diagrams of the pixel circuit structure in different embodiments;

[0054] Figure 13 This is a flowchart illustrating a pixel circuit driving method in one embodiment;

[0055] Figure 14 This is a timing diagram of the driving of the pixel circuit in one embodiment;

[0056] Figure 15 This is a timing diagram of the pixel circuit driving in another embodiment. Detailed Implementation

[0057] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. The drawings illustrate embodiments of this application. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0059] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element present. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this article are for illustrative purposes only.

[0060] In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity. In the embodiments described below, when a layer, region, or element is "connected," it can be interpreted as the layer, region, or element being connected not only directly but also through other constituent elements placed therebetween. For example, when a layer, region, element, etc., is described as being connected or linked, the layer, region, element, etc., can not only be directly connected or linked but also be connected or linked through another layer, region, element, etc., placed therebetween.

[0061] In the following text, although terms such as “first” and “second” may be used to describe various components, these components are not necessarily limited to the terms above. The terms above are only used to distinguish one component from another. It will also be understood that expressions used in the singular form include plural expressions, unless the singular form has a distinctly different meaning in the context.

[0062] It should also be understood that the terms “including / comprise” or “have” specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0063] Electronic or electrical devices and / or any other related devices or components (e.g., display devices including a display panel and a display panel driver, wherein the display panel driver further includes a drive controller, a gate driver, a gamma reference voltage generator, a data driver, and a transmit driver) according to embodiments of the concepts described herein can be implemented using any suitable hardware, firmware (e.g., application-specific integrated circuits), software, or a combination of software, firmware, and hardware. For example, various components of these devices may be formed on an integrated circuit (IC) chip or on a separate IC chip. Additionally, various components of these devices may be implemented on a flexible printed circuit film, a tape-on-a-package (TCP), a printed circuit board (PCB), or formed on a substrate. Furthermore, various components of these devices may be processes or threads running on one or more processors in one or more computing devices to execute computer program instructions and interact with other system components to perform the various functions described herein. Computer program instructions are stored in memory, which may be implemented in a computing device using standard storage devices such as random access memory (RAM). Computer program instructions may also be stored in other non-transitory computer-readable media such as CD-ROMs, flash drives, etc. Furthermore, those skilled in the art will recognize that the functions of various computing devices may be combined or integrated into a single computing device, or the functions of a particular computing device may be distributed across one or more other computing devices, without departing from the spirit and scope of the exemplary embodiments of the present application.

[0064] While exemplary embodiments of the display module and the display device including the display module have been specifically described herein, many modifications and variations will be apparent to those skilled in the art. Therefore, it will be understood that the display module and the display device including the display module, constructed according to the principles of this application, may be implemented in ways other than those specifically described herein. This application is also defined in the claims and their equivalents.

[0065] As described in the background section, active-matrix organic light-emitting diode (OLED) displays emit light by means of current driving. Therefore, the characteristics of TFT devices directly affect the grayscale brightness difference of the display device. When the characteristics of TFT devices of different sub-pixels are too different, it is easy to cause uneven image quality, such as producing mura (i.e., uneven brightness of the display, causing various marks).

[0066] To address the aforementioned problems, in existing display devices, such as Figure 1 As shown, the brightness uniformity of the entire display screen can be improved by internally compensating the threshold voltage Vth of the pixel circuit. However, when the circuit switches between high and low frequencies, the driving transistors ( Figure 1The stress on M1 in the display panel varies, resulting in differences in the characteristics of the driving transistors. This leads to differences in the driving current under the same data voltage, causing the display panel to flicker when switching between high and low frequencies.

[0067] To address the aforementioned problems, in one embodiment, such as Figure 2 As shown, this application provides a pixel circuit, including: a driving transistor M0, a light-emitting control module 100, a threshold compensation module 200, and a coupling module 300. The driving transistor M0 provides driving current to a light-emitting device. The light-emitting control module 100 is connected to the first and second terminals of the driving transistor M0, respectively, and is used to respond to a light-emitting control signal EM to form a driving current path in the driving transistor M0. The control terminal 201 of the threshold compensation module 200 receives a first scan signal S1, the first terminal 202 of the threshold compensation module 200 is connected to the second terminal of the driving transistor M0, and the second terminal 203 of the threshold compensation module 200 is connected to the gate of the driving transistor M0. The first terminal 301 of the coupling module 300 receives a second scan signal S2, and the second terminal 302 of the coupling module 300 is connected to the target terminal of the driving transistor M0, and is used to respond to the second scan signal S2 to cause a coupling change in the potential of the target terminal of the driving transistor M0, thereby increasing the potential of the target terminal of the driving transistor M0, wherein the target terminal is one of the first and second terminals of the driving transistor M0.

[0068] The driving transistor M0 includes a gate, a first terminal, and a second terminal. The gate of the driving transistor M0 is named node G of the pixel circuit; the first terminal of the driving transistor M0 is usually called the source, and it is named node S of the pixel circuit; the second terminal of the driving transistor M0 is usually called the drain, and it is named node D of the pixel circuit. Since the structure of transistors in the display panel is symmetrical, the source and drain of the driving transistor M0 are not distinguished.

[0069] This application does not limit the channel type of the driving transistor M0; the channel type of the driving transistor M0 can be P-type or N-type. The specific circuit structure of the pixel circuit will be described below using a P-type channel type for the driving transistor M0.

[0070] The threshold compensation module 200 has a threshold compensation function and includes a control terminal 201, a first terminal 202, and a second terminal 203. The control terminal 201 is connected to a first scan signal S1. The first terminal 202 is connected to node D, and the second terminal 203 is connected to node G. Under the control of the first switching signal S1, the threshold compensation module 200 changes the switching states of the first terminal 202 and the second terminal 203. When the first and second terminals of the driving transistor M0 are turned on, and the first terminal 202 and the second terminal 203 are turned on, node S receives the data voltage data. The data voltage data is transmitted to node D through the turned-on driving transistor M0, and then to node G. Due to the conduction characteristics of the driving transistor M0, there is a threshold voltage difference between node G (same as node D) and node S, and the voltage of node G is Vdata + Vth; thus achieving threshold voltage compensation for the driving transistor M0.

[0071] The light-emitting control module 100 has a switching function and includes a first terminal 101, a second terminal 102, a third terminal 103, a fourth terminal 104, a fifth terminal 105, and a sixth terminal 106. The first terminal 101 and the fourth terminal 104 are control terminals, connected to the light-emitting control signal EM. The second terminal 102 is connected to the first power signal VDD, the third terminal 103 is connected to node S, the fifth terminal 105 is connected to node D, and the sixth terminal 106 is connected to the anode of the light-emitting device. The first terminal 101 and the fourth terminal 104 receive the light-emitting control signal EM. Under the control of the light-emitting control signal EM, the light-emitting control module 100 changes the switching states of the second terminal 102 and the third terminal 103, and simultaneously changes the switching states of the fifth terminal 105 and the sixth terminal 106. When the second terminal 102 and the third terminal 103 are turned on, the source of the driving transistor M0 is connected to the first power supply voltage VDD. When the fifth terminal 105 and the sixth terminal 106 are turned on, the drain of the driving transistor M0 is connected to the light-emitting device, thereby connecting the second power supply voltage VSS.

[0072] The coupling module 300 includes a first terminal 301 and a second terminal 302. The first terminal 301 receives the second scan signal S2, and the second terminal 302 is connected to node S. The coupling module 300 has a voltage coupling function, which can respond to the second scan signal S2 during the corresponding working stage of the pixel circuit to cause a coupling change in the potential of the target electrode of the driving transistor M0. Through the coupling effect, the potential of the target electrode is raised (corresponding to the potential of node S or node G), thereby improving the stress difference between the write frame and the hold frame, ensuring that the state of the driving transistors of the write frame and the hold frame is consistent, and thus improving frequency switching flicker.

[0073] In applications, low-frequency displays can be achieved through frame skipping, for example, as... Figure 3As shown, a 1Hz display, based on a 60Hz display, skips frames. The skipping should consist of 59 frames. In the first frame, the light-emitting control module 100 is turned off, and data voltage (data) is written; this is called the write frame. In the other 59 frames, the light-emitting control module 100 is turned off, the light-emitting device does not emit light, but no data voltage (data) is written; this is called the hold frame. However, the initialization level of the driving transistor M0 differs between the write and hold frames, resulting in different electron release capabilities from its drain. This leads to uneven light emission during the illumination phase, causing screen flickering. Raising the potential of the target electrode of the driving transistor M0 can enhance its electron release capability, reducing the difference in electron release capability between the write and hold frames before illumination, thus improving the display effect.

[0074] The aforementioned pixel circuit receives the second scan signal S2 through the first terminal of the coupling module 300 and connects the second terminal of the coupling module 300 to the target electrode of the driving transistor M0. This allows the coupling module 300 to respond to the second scan signal S2, causing a coupling change in the potential of the target electrode of the driving transistor M0, thereby increasing the potential of the target electrode of the driving transistor M0. When the driving transistor M0 is turned on, the potentials of the first and second electrodes of the driving transistor M0 are the same and at a high potential. This improves the difference in stress experienced by the driving transistor M0 during the write frame and hold frame, ensuring that the state of the driving transistor is consistent during the write frame and hold frame. This can improve the flickering problem that occurs when the display panel switches between high and low frequencies.

[0075] In one embodiment, such as Figure 4 As shown, the coupling module 300 includes a coupling capacitor C0. The first end of the coupling capacitor C0 is used to receive the second scan signal S2, and the second end of the coupling capacitor C0 is connected to the first terminal of the driving transistor M0.

[0076] Specifically, by having the first terminal of the coupling capacitor C0 receive the second scan signal S2, and the second terminal of the coupling capacitor C0 connected to the first terminal of the driving transistor M0, when the potential of the second scan signal S2 changes, the potential of the first terminal of the driving transistor M0 connected to the second terminal of the coupling capacitor C0 changes accordingly. This adaptively adjusts the potential of node S. During a specific operating phase of the pixel circuit, the potential of the second scan signal S2 changes from low to high, thereby increasing the potential of node S. When the driving transistor M0 is turned on, the potential of point S is pulled high, and the potential VD of node D and the potential VS of node S satisfy VD = VS. This improves the stress difference between the write frame and the hold frame, ensures that the states of the driving transistors in the write frame and the hold frame are consistent, and can improve frequency switching flicker.

[0077] In another embodiment, the coupling module 300 includes a coupling capacitor C0, the first end of which is used to receive the second scan signal S2, and the second end of which is connected to the second terminal of the driving transistor M0.

[0078] Similarly, by having the first terminal of the coupling capacitor C0 receive the second scan signal S2, and the second terminal of the coupling capacitor C0 connected to the first terminal of the driving transistor M0, when the potential of the second scan signal S2 changes, the potential of the second terminal of the driving transistor M0 connected to the second terminal of the coupling capacitor C0 changes accordingly. This adaptively adjusts the potential of node G. During a specific operating phase of the pixel circuit, the potential of the second scan signal S2 changes from low to high, thereby increasing the potential of node G. Likewise, when the driving transistor M0 is turned on, the potential of node D is pulled high, and the voltage VD of node D and the voltage VS of node S satisfy VD = VS, thereby improving the stress difference between writing and holding frames and reducing frequency switching flicker.

[0079] In one embodiment, such as Figure 5 As shown, the coupling module 300 includes a coupling capacitor C0, a first transistor M1, and a second transistor M2. The first terminals of the first transistor M1 and the second transistor M2 are respectively connected to the first terminal of the coupling capacitor C0, and the second terminal of the coupling capacitor C0 is connected to the target terminal of the driving transistor M0. The gate of the first transistor M1 is used to receive the light emission control signal EM, and the second terminal of the first transistor M1 is used to receive the first reset signal Vref1. The gate of the second transistor M2 is used to receive the second scan signal S2, and the second terminal of the second transistor M2 is used to receive the adjustment voltage VEH.

[0080] Based on the aforementioned coupling module 300, the coupling capacitor C0, which was previously connected to the second scan signal S2, is now connected to two transistors (M1 and M2). The other ends of M1 and M2 are respectively the first reset signal Vref1 and the adjustment voltage VEH, with VEH being a positive voltage that is adjustable, making VEH voltage adjustment more flexible and convenient. M1 is controlled by the light emission control signal EM, and M2 is controlled by the second scan signal S2, the timing of which is adjustable. With the above structure, when the holding frame is not activated, and during the working phase when the pixel circuit raises the potential of the target electrode of the driving transistor M0, the S2 signal changes from a high level to a low level.

[0081] In one embodiment, such as Figure 6As shown, the pixel circuit further includes a first storage module 400. The first terminal of the first storage module 400 is used to receive a first power supply voltage VDD, and the second terminal of the first storage module 400 is connected to the first terminal of the driving transistor M0 for storing data voltage data.

[0082] The first storage module 400 has an energy storage function. It includes a first terminal 401 and a second terminal 402. The first terminal 401 receives a first power supply voltage VDD, and the second terminal 402 is connected to the first electrode of the driving transistor M0. During the first write phase, the second terminal 402 and the first electrode of the driving transistor M0 receive a data voltage data. Therefore, the first storage module 400 can store the data voltage data. In the next phase after the first write phase, all signals are at a high level. The first storage module 400 is connected between point S and VDD and can store the data voltage data. It continues to charge the gate of the driving transistor M0, increasing the potential of the gate of the driving transistor M0 and widening the potential difference between the gate and the first electrode. Since the charging current is large when the stress of the driving transistor M0 is small, and small when the stress is large, increasing the potential difference between the gate and the first electrode of the driving transistor M0 can compensate for the stress difference of the driving transistor M0 to a certain extent, thereby improving the display unevenness caused by the stress difference of the driving transistor M0.

[0083] It is understood that the first storage module 400 can store voltage using a capacitor. Therefore, optionally, as... Figure 7 As shown, the first storage module 400 includes a first storage capacitor C1, the first end of the first storage capacitor C1 is used to receive the first power supply voltage VDD, and the second end of the first storage capacitor C1 is connected to the first terminal of the driving transistor M0.

[0084] In one embodiment, such as Figure 8 As shown, the pixel circuit further includes: a second storage module 500, a first terminal 501 of the second storage module 500 for receiving the first power supply voltage VDD, and a second terminal 502 of the second storage module 500 connected to the gate of the driving transistor M0 for storing data voltage containing threshold voltage information.

[0085] The second storage module 500 includes a first terminal 501 and a second terminal 502. The first terminal 501 is connected to a first power signal VDD, and the second terminal 502 is connected to node G. The second storage module 500 has a voltage storage function, storing data voltage containing threshold voltage information, and can maintain a stable voltage difference between node G and node S during the light emission stage.

[0086] Similarly, the second storage module 500 can store voltage using a capacitor. Optionally, as... Figure 9 As shown, the second storage module 500 includes a second storage capacitor C2. The first end of the second storage capacitor C2 is used to receive a first power supply voltage VDD, and the second end of the second storage capacitor C2 is connected to the first terminal of the driving transistor M0.

[0087] In one embodiment, such as Figure 10 As shown, the light-emitting control module 100 includes a first light-emitting control submodule 110 and a second light-emitting control submodule 120. The control terminal 111 of the first light-emitting control submodule 110 is used to receive a light-emitting control signal EM, the first terminal 112 of the first light-emitting control submodule 110 is used to receive a first power supply voltage VDD, and the second terminal 113 of the first light-emitting control submodule 110 is connected to the first electrode of the driving transistor M0. The control terminal 121 of the second light-emitting control submodule 120 is used to receive the light-emitting control signal EM, the first terminal 122 of the second light-emitting control submodule 120 is connected to the second electrode of the driving transistor M0, and the second terminal 123 of the second light-emitting control submodule 120 is connected to the anode of the light-emitting device.

[0088] Both the first light-emitting control submodule 110 and the second light-emitting control submodule 120 have switching functions. The first light-emitting control submodule 110 includes a control terminal 111, a first terminal 112, and a second terminal 113. The second light-emitting control submodule 120 includes a control terminal 121, a first terminal 122, and a second terminal 123. The control terminal 111 and the control terminal 121 receive the light-emitting control signal EM. The first terminal 112 receives the first power supply voltage VDD. The second terminal 113 is connected to the first electrode of the driving transistor M0. The first terminal 122 is connected to node D. The second terminal 123 is connected to the anode of the light-emitting device. During the light-emitting stage, the first terminal 112 and the second terminal 113 are turned on, and the first electrode of the driving transistor M0 is connected to the first power supply voltage VDD. When the first terminal 122 and the second terminal 123 are turned on, the second electrode of the driving transistor M0 is connected to the light-emitting device, and then the second power supply voltage VSS is connected, so that the driving transistor M0 can provide driving current to the light-emitting device and drive the light-emitting device to emit light.

[0089] In one embodiment, such as Figure 10As shown, the pixel circuit further includes: a writing module 600, a first reset module 700, and a second reset module 800. The control terminal 601 of the writing module 600 is used to receive a third scan signal, the first terminal 602 of the writing module 600 is used to receive a data voltage data, and the second terminal 603 of the writing module 600 is connected to the first electrode of the driving transistor M0. The control terminal 701 of the first reset module 700 is used to receive a fourth scan signal S4, the first terminal 702 of the first reset module 700 is used to receive a first reset signal Vref1, and the second terminal 703 of the first reset module 700 is connected to the gate of the driving transistor M0. The control terminal 801 of the second reset module 800 is used to receive the third scan signal S3, the first terminal 802 of the second reset module 800 is used to receive a second reset signal Vref2, and the second terminal 803 of the second reset module 800 is connected to the anode of the light-emitting device.

[0090] The writing module 600 includes a control terminal 601, a first terminal 602, and a second terminal 603. The control terminal 601 receives a third scan signal S3, the first terminal 602 receives a data voltage data, and the second terminal 603 is connected to the first electrode of the driving transistor M0. In the first writing stage, the writing module 600 responds to the third scan signal S3, causing the first terminal 602 and the second terminal 603 to conduct, thereby causing the first electrode of the driving transistor M0 to receive the data voltage data. The data voltage data is written to point G by the driving transistor M0 and the threshold compensation module 200, and the potential of point G is Vdata + Vth.

[0091] The first reset module 700 includes a control terminal 701, a first terminal 702, and a second terminal 703. The control terminal 701 receives a fourth scan signal S4, the first terminal 702 receives a first reset signal Vref1, and the second terminal 703 is connected to the gate of the driving transistor M0. During the reset phase, the first reset module 700 responds to the fourth scan signal S4, and the first terminal 702 and the second terminal 703 are turned on. The first reset signal Vref1 resets the gate of the driving transistor M0.

[0092] The second reset module 800 includes a control terminal 801, a first terminal 802, and a second terminal 803. The control terminal 801 receives the third scan signal S3, the first terminal 802 receives the second reset signal Vref2, and the second terminal 803 is connected to the anode of the light-emitting device. During the reset phase, the first terminal 802 and the second terminal 803 are turned on, and the second reset signal Vref2 resets the anode of the light-emitting device.

[0093] In one embodiment, such as Figures 10 to 12As shown, the writing module 600 includes a third transistor M3. The gate of the third transistor M3 is used to receive the third scan signal S3, the first terminal of the third transistor M3 is used to receive the data voltage data, and the second terminal of the third transistor M3 is connected to the first terminal of the driving transistor M0. The gate of the third transistor M3 is the control terminal 601 of the writing module 600, the first terminal of the third transistor M3 is the first terminal 602 of the writing module 600, and the second terminal of the third transistor M3 is the second terminal 603 of the writing module 600.

[0094] The first light-emitting control submodule 110 includes a fourth transistor M4. The gate of the fourth transistor M4 is used to receive the light-emitting control signal EM, the first terminal of the fourth transistor M4 is used to receive the first power supply voltage VDD, and the second terminal of the fourth transistor M4 is connected to the first terminal of the driving transistor M0. The gate of the fourth transistor M4 is the control terminal 111 of the first light-emitting control submodule 110, the first terminal of the fourth transistor M4 is the first terminal 112 of the first light-emitting control submodule 110, and the second terminal of the fourth transistor M4 is the second terminal 113 of the first light-emitting control submodule 110.

[0095] The second light-emitting control submodule 120 includes a fifth transistor M5. The gate of the fifth transistor M5 is used to receive the light-emitting control signal EM. The first terminal of the fifth transistor M5 is connected to the second terminal of the driving transistor M0, and the second terminal of the fifth transistor M5 is connected to the anode of the light-emitting device. The gate of the fifth transistor M5 is the control terminal 121 of the second light-emitting control submodule 120, the first terminal of the fifth transistor M5 is the first terminal 122 of the second light-emitting control submodule 120, and the second terminal of the fifth transistor M5 is the second terminal 123 of the second light-emitting control submodule 120.

[0096] The first reset module 700 includes a sixth transistor M6. The gate of the sixth transistor M6 is used to receive the fourth scan signal S4, the first terminal of the sixth transistor M6 is used to receive the first reset signal Vref1, and the second terminal of the sixth transistor M6 is connected to the gate of the driving transistor M0. The gate of the sixth transistor M6 is the control terminal 701 of the first reset module 700, the first terminal of the sixth transistor M6 is the first terminal 702 of the first reset module 700, and the second terminal of the sixth transistor M6 is the second terminal 703 of the first reset module 700.

[0097] The second reset module 800 includes a seventh transistor M7. The gate of the seventh transistor M7 is used to receive the third scan signal, the first terminal of the seventh transistor M7 is used to receive the second reset signal Vref2, and the second terminal of the seventh transistor M7 is connected to the anode of the light-emitting device. The gate of the seventh transistor M7 is the control terminal 801 of the second reset module 800, the first terminal of the seventh transistor M7 is the first terminal 802 of the second reset module 800, and the second terminal of the seventh transistor M7 is the second terminal 803 of the second reset module 800.

[0098] The threshold compensation module 200 includes an eighth transistor M8. The control terminal of the eighth transistor M8 is used to receive the first scan signal S1. The first terminal of the eighth transistor M8 is connected to the second terminal of the driving transistor M0, and the second terminal of the eighth transistor M8 is connected to the gate of the driving transistor M0. The gate of the eighth transistor M8 is the control terminal 201 of the threshold compensation module 200, the first terminal of the eighth transistor M8 is the first terminal 202 of the threshold compensation module 200, and the second terminal of the eighth transistor M8 is the second terminal 203 of the threshold compensation module 200.

[0099] In one embodiment, the sixth transistor M6 and the eighth transistor M8 are indium gallium zinc oxide thin-film transistors, and the driving transistor M0, the third transistor M3, the fourth transistor M4, the fifth transistor M5, and the seventh transistor M7 are low-temperature polycrystalline silicon thin-film transistors.

[0100] Among them, the sixth transistor M6 and the eighth transistor M8 are two transistors connected to the gate of the driving transistor M0. The sixth transistor M6 and the eighth transistor M8 are indium gallium zinc oxide thin film transistors, which result in low leakage current and enable low frequency display.

[0101] In the application, the first scan signal S1, the fourth scan signal S4, and the light emission control signal EM can be provided by the GIP (Gate in panel) circuit of the display panel. During the operation of the pixel circuit, there are sudden changes in high and low levels, which are used to control the conduction and disconnection of each module.

[0102] In one embodiment, such as Figure 13As shown, this application also provides a driving method for a pixel circuit. The pixel circuit includes a driving transistor M0, a light-emitting control module 100, a threshold compensation module 200, and a coupling module 300. The first terminal of the coupling module 300 is used to receive a second scan signal S2, and the second terminal of the coupling module 300 is connected to a target electrode of the driving transistor M0. The target electrode is one of the first and second electrodes of the driving transistor M0. The driving method includes a first write stage, a first reset stage, and a first light-emitting stage.

[0103] S1301: In the first writing stage, the threshold compensation module 200 responds to the first scan signal S1 and writes the data voltage data through the first and second terminals of the driving transistor M0 to the gate of the driving transistor M0, thereby completing the threshold voltage compensation of the driving transistor M0.

[0104] Prior to the first writing stage, the driving method may further include a reset stage. During the reset stage, the light emission control signal EM is high, and the light emission control module 100 is turned off; S4 is high, and Vref1 resets the gate of the driving transistor M0 via M6, making VG = Vref1, and turning on the first and second terminals of the driving transistor M0. In the first writing stage, the first and second terminals of the driving transistor M0 are turned on, and S1 is high and S3 is low, turning on the first terminal 202 and the second terminal 203 of the threshold compensation module 200. The data voltage data is written to point G by the driving transistor M0 and the threshold compensation module 200, making the level of point G Vdata + Vth.

[0105] S1302: In the first reset phase, the coupling module 300 responds to the second scan signal S2 to cause a coupling change in the potential of the target electrode of the driving transistor M0, so as to increase the potential of the target electrode of the driving transistor M0; the first electrode and the second electrode of the driving transistor M0 are reset under the action of the first reset signal Vref1.

[0106] After the first write phase, in the first reset phase, taking the first pole of the target pole as the first pole of the driving transistor M0 as an example, the potential of node S is the data voltage data. In this phase, the coupling module 300 responds to the second scan signal S2 and couples node S upward to a higher potential, VS=data+k*(VGH-VGL), VG-VS<Vth, DTFT is turned on, the potential of point S is pulled up, and VD=VS; thereby achieving the purpose of improving the stress difference between the write frame and the hold frame.

[0107] S1303: In the first light-emitting stage, the light-emitting control module 100 responds to the light-emitting control signal EM, so that the first and second terminals of the driving transistor M0 are respectively connected to the voltage to form a driving current path, and the driving transistor M0 provides driving current to the light-emitting device.

[0108] In the first light-emitting stage, the first and second terminals of the driving transistor M0 are connected to voltage respectively to form a driving current path. The driving transistor M0 provides driving current to the light-emitting device, driving the light-emitting device to emit light.

[0109] In the aforementioned pixel circuit driving method, during the first writing stage, the threshold compensation module 200 responds to the first scan signal S1, causing the data voltage data to be written to the gate of the driving transistor M0 via the first and second electrodes, thereby compensating for the threshold voltage of the driving transistor M0 and improving the display uniformity of the display panel. Based on this, during the first reset stage, the coupling module 300 responds to the second scan signal S2, causing a coupling change in the potential of the target electrode of the driving transistor M0, increasing the potential of the target electrode of the driving transistor M0. This ensures that when the driving transistor M0 is turned on, the potentials of the first and second electrodes of the driving transistor M0 are the same and at a high potential, mitigating the stress difference experienced by the driving transistor M0 during the write frame and hold frame, ensuring consistency in the state of the driving TFT during the write frame and hold frame. Thus, while ensuring the display uniformity of the display panel during the first light emission stage, it can also improve the flickering problem that occurs when the display panel switches between high and low frequencies.

[0110] In one embodiment, the driving method further includes a second reset phase and a second emission phase.

[0111] During the second reset phase, the first and second terminals of the driving transistor are reset under the action of the data voltage, the anode of the light-emitting device is reset under the action of the second reset signal, and the coupling module 300 responds to the second scan signal S2 to cause the potential of the target terminal of the driving transistor M0 to undergo a coupling change again, so as to increase the potential of the target terminal of the driving transistor M0.

[0112] In the second reset phase, after the first light-emitting phase, taking the first electrode of the driving transistor M0 as an example, the first and second electrodes of the driving transistor are reset under the action of the data voltage. After the anode of the light-emitting device is reset under the action of the second reset signal, the potentials of points S and D are both the data voltage data, keeping the potentials of points S and D consistent. Then, the coupling module 300 responds to the second scan signal S2 and couples the potential of point S upward to a higher potential, VS = data + k*(VGH - VGL), VG - VS < Vth, the driving transistor M0 is turned on, the potentials of points S and D are both pulled high, and VD = VS; thereby improving the stress difference between the written frame and the held frame, and at least one of VGH, VGL, and the data voltage data can be adjusted to adjust the potential difference Vgs between points G and S, that is, to adjust the potential difference between the gate and the first electrode of the driving transistor M0, thereby improving the frequency switching flicker.

[0113] In the second light-emitting stage, the light-emitting control module 100 responds to the light-emitting control signal EM, causing the first and second terminals of the driving transistor M0 to be connected to voltage respectively, forming a driving current path, and the driving transistor M0 provides driving current to the light-emitting device; at the same time, the potential of the second scanning signal S2 changes from high potential to low potential.

[0114] In one embodiment, the pixel circuit further includes a first storage module 400, a first terminal of which is used to receive a first power supply voltage VDD, and a second terminal of which is connected to the first terminal of the driving transistor M0; the driving method further includes a second write stage.

[0115] The second write phase is located between the first write phase and the first reset phase.

[0116] During the first write phase, the first terminal of the first storage module 400 receives a first power supply voltage VDD, and the second terminal of the first storage module 400 receives a data voltage data to store the data voltage data.

[0117] During the second write phase, the first storage module 400 charges the gate of the driving transistor M0 to increase the potential of the gate of the driving transistor M0.

[0118] During the second writing phase, all signals are at a high level. C2 is connected between point S and VDD, which can store the data voltage data. It continues to charge the gate of the driving transistor M0, increasing the potential of the gate of the driving transistor M0 and widening the potential difference between the gate and the first electrode of the driving transistor M0. Since the charging current is large when the stress of the driving transistor M0 is small and small when the stress is large, increasing the potential difference between the gate and the first electrode of the driving transistor M0 can compensate for the stress difference of the driving transistor M0 to a certain extent, thereby improving the display unevenness caused by the stress difference of the driving transistor M0.

[0119] It should be noted that, as Figure 4 As shown, the coupling module 300 includes a coupling capacitor C0. The first terminal of the coupling capacitor C0 receives the second scan signal S2, and the second terminal of the coupling capacitor C0 is connected to the target electrode of the driving transistor M0. At this time, during the first reset phase and the second reset phase, S2 changes from a low potential to a high potential; during the first light emission phase and the second light emission phase, S2 changes from a high potential to a low potential. Corresponding to the driving timing of each stage of the above driving method, as follows... Figure 14 As shown, the driving method includes: a reset phase T1, a first write phase T2, a second write phase T3, a first reset phase T4, a first light emission phase T5, a second reset phase T6 and T7, and a second light emission phase T8.

[0120] In one embodiment, the coupling module 300 includes a coupling capacitor C0, a first transistor M1, and a second transistor M2. The first terminals of the first transistor M1 and the second transistor M2 are respectively connected to the first terminal of the coupling capacitor C0, and the second terminal of the coupling capacitor C0 is connected to the target terminal of the driving transistor M0. The gate of the first transistor M1 is used to receive a light emission control signal EM, and the second terminal of the first transistor M1 is used to receive a first reset signal Vref1. The gate of the second transistor M2 is used to receive a second scan signal S2, and the second terminal of the second transistor M2 is used to receive an adjustment voltage. At this time, as... Figure 15As shown, the driving method can still include various working stages. The difference is that in the first reset stage, the second scan signal S2 changes from a low potential to a high potential; in the first light emission stage, the potential of the second scan signal S2 changes from a low potential to a high potential; in the second reset stage, the second scan signal S2 changes from a low potential to a high potential; and in the second light emission stage, the potential of the second scan signal S2 changes from a low potential to a high potential. S2 does not need to be activated after the first light emission stage. Specifically, the driving method includes: a reset stage T1, a first write stage T2, a second write stage T3, a first reset stage T4, a first light emission stage T5, a second reset stage T7, and a second light emission stage T8.

[0121] In one embodiment, this application also provides a display panel (not shown) including a light-emitting device and a pixel circuit as described above, wherein the pixel circuit is connected to the light-emitting device and is used to drive the light-emitting device to emit light.

[0122] The aforementioned display panel includes the aforementioned pixel circuit. The first end of the coupling module of the pixel circuit receives the second scan signal and connects the second end of the coupling module to the target electrode of the driving transistor. This allows the coupling module to respond to the second scan signal and cause a coupling change in the potential of the target electrode of the driving transistor, thereby increasing the potential of the target electrode of the driving transistor. When the driving transistor is turned on, the potentials of the first and second electrodes of the driving transistor are the same and at a high potential. This improves the difference in stress experienced by the driving transistor under write and hold frames, thereby improving the flickering problem that occurs when the display panel switches between high and low frequencies when the pixel circuit drives the light-emitting device to emit light.

[0123] Based on the same inventive concept, in one embodiment, this application also provides a display device (not shown), which includes the display panel in the above embodiment.

[0124] It is understood that the display device in the embodiments of this application can be any product or component with display function, such as OLED display device, QLED display device, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, wearable device, Internet of Things device, etc., and the embodiments disclosed in this application do not limit this.

[0125] The advantages of the aforementioned display device over existing technology are the same as the advantages of the aforementioned display panel over existing technology, and will not be repeated here.

[0126] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pixel circuit, characterized by comprising: The pixel circuit comprises: a driving transistor for providing a driving current to a light emitting device; a light emitting control module connected with a first electrode and a second electrode of the driving transistor respectively, for enabling the driving transistor to form a driving current path in response to a light emitting control signal; a threshold compensation module, a control end of the threshold compensation module being used for receiving a first scanning signal, a first end of the threshold compensation module being connected with the second electrode of the driving transistor, and a second end of the threshold compensation module being connected with a gate electrode of the driving transistor; a coupling module, a first end of the coupling module being used for receiving a second scanning signal, and a second end of the coupling module being connected with a target electrode of the driving transistor, for enabling the target electrode of the driving transistor to have a coupling change in response to the second scanning signal, so as to increase a potential of the target electrode of the driving transistor, wherein the target electrode is one of the first electrode and the second electrode of the driving transistor; wherein the coupling module comprises a coupling capacitor, a first transistor and a second transistor, first electrodes of the first transistor and the second transistor being connected with a first end of the coupling capacitor respectively, a second end of the coupling capacitor being connected with the target electrode of the driving transistor, a gate electrode of the first transistor being used for receiving the light emitting control signal, a second electrode of the first transistor being used for receiving a first reset signal, a gate electrode of the second transistor being used for receiving the second scanning signal, and a second electrode of the second transistor being used for receiving an adjusting voltage; the adjusting voltage is an adjustable positive voltage; the coupling module enables the target electrode of the driving transistor to have a coupling change in response to the second scanning signal in a first reset stage, so as to increase the potential of the target electrode of the driving transistor; and enables the target electrode of the driving transistor to have a coupling change in response to the second scanning signal again in a second reset stage, so as to increase the potential of the target electrode of the driving transistor; the first reset stage is located after a first write stage and before a first light emitting stage; and the second reset stage is located after the first light emitting stage and before a second light emitting stage.

2. The pixel circuit of claim 1, wherein, Alternatively, the coupling module comprises a coupling capacitor, a first end of the coupling capacitor being used for receiving the second scanning signal, and a second end of the coupling capacitor being connected with the first electrode of the driving transistor.

3. The pixel circuit of claim 1, wherein, Alternatively, the coupling module comprises a coupling capacitor, a first end of the coupling capacitor being used for receiving the second scanning signal, and a second end of the coupling capacitor being connected with the second electrode of the driving transistor.

4. The pixel circuit of claim 1, wherein, The pixel circuit further comprises a first storage module, a first end of the first storage module being used for receiving a first power voltage, and a second end of the first storage module being connected with the first electrode of the driving transistor, for storing a data voltage.

5. The pixel circuit of claim 4, wherein, The first storage module comprises a first storage capacitor, a first end of the first storage capacitor being used for receiving the first power voltage, and a second end of the first storage capacitor being connected with the first electrode of the driving transistor.

6. The pixel circuit of claim 4, wherein, The pixel circuit further comprises: A second storage module, a first end of the second storage module is configured to receive the first power voltage, and a second end of the second storage module is connected with the gate of the driving transistor and is configured to store a data voltage containing threshold voltage information.

7. The pixel circuit of claim 6, wherein, The second storage module comprises a second storage capacitor, a first end of the second storage capacitor is configured to receive the first power voltage, and a second end of the second storage capacitor is connected with the first electrode of the driving transistor.

8. The pixel circuit according to any one of claims 1 to 7, characterized by, The light emitting control module comprises a first light emitting control submodule and a second light emitting control submodule; The control end of the first light emitting control submodule is configured to receive a light emitting control signal, a first end of the first light emitting control submodule is configured to receive the first power voltage, and a second end of the first light emitting control submodule is connected with the first electrode of the driving transistor; The control end of the second light emitting control submodule is configured to receive the light emitting control signal, a first end of the second light emitting control submodule is connected with the second electrode of the driving transistor, and a second end of the second light emitting control submodule is connected with the anode of the light emitting device.

9. The pixel circuit of claim 8, wherein, The pixel circuit further comprises a writing module, a first reset module and a second reset module. The control end of the writing module is configured to receive a third scanning signal, a first end of the writing module is configured to receive a data voltage, and a second end of the writing module is connected with the first electrode of the driving transistor; The control end of the first reset module is configured to receive a fourth scanning signal, a first end of the first reset module is configured to receive a first reset signal, and a second end of the first reset module is connected with the gate of the driving transistor; The control end of the second reset module is configured to receive the third scanning signal, a first end of the second reset module is configured to receive a second reset signal, and a second end of the second reset module is connected with the anode of the light emitting device.

10. The pixel circuit of claim 9, wherein, The writing module comprises a third transistor, the gate of the third transistor is configured to receive the third scanning signal, the first electrode of the third transistor is configured to receive the data voltage, and the second electrode of the third transistor is connected with the first electrode of the driving transistor; The first light emitting control submodule comprises a fourth transistor, the gate of the fourth transistor is configured to receive the light emitting control signal, the first electrode of the fourth transistor is configured to receive the first power voltage, and the second electrode of the fourth transistor is connected with the first electrode of the driving transistor; The second light emitting control submodule comprises a fifth transistor, the gate of the fifth transistor is configured to receive the light emitting control signal, the first electrode of the fifth transistor is connected with the second electrode of the driving transistor, and the second electrode of the fifth transistor is connected with the anode of the light emitting device; The first reset module comprises a sixth transistor, the gate of the sixth transistor is configured to receive the fourth scanning signal, the first electrode of the sixth transistor is configured to receive the first reset signal, and the second electrode of the sixth transistor is connected with the gate of the driving transistor; The second reset module comprises a seventh transistor, a gate of the seventh transistor is configured to receive the third scan signal, a first pole of the seventh transistor is configured to receive the second reset signal, and a second pole of the seventh transistor is connected with the anode of the light emitting device; The threshold compensation module comprises an eighth transistor, a control end of the eighth transistor is configured to receive the first scan signal, a first pole of the eighth transistor is connected with the second pole of the driving transistor, and a second pole of the eighth transistor is connected with the gate of the driving transistor.

11. The pixel circuit of claim 10, wherein, The sixth transistor and the eighth transistor are indium gallium zinc oxide thin film transistors, and the driving transistor, the third transistor, the fourth transistor, the fifth transistor, and the seventh transistor are low-temperature polysilicon thin film transistors.

12. A driving method of a pixel circuit, characterized by, The driving method for the pixel circuit of any one of claims 1-11 comprises a first write stage, a first reset stage, and a first light emitting stage. In the first write stage, the threshold compensation module is configured to cause the data voltage to be written to the gate of the driving transistor via the first pole and the second pole of the driving transistor in response to the first scan signal, so as to complete threshold voltage compensation of the driving transistor. In the first reset stage, the coupling module is configured to cause the potential of the target pole of the driving transistor to change in coupling in response to the second scan signal, so as to increase the potential of the target pole of the driving transistor. In the first light emitting stage, the light emitting control module is configured to cause the first pole and the second pole of the driving transistor to be connected to a voltage respectively, so as to form a driving current path, and the driving transistor is configured to provide a driving current to the light emitting device.

13. The driving method of the pixel circuit according to claim 12, wherein The driving method further comprises a second reset stage and a second light emitting stage. In the second reset stage, the first pole and the second pole of the driving transistor are reset under the action of the data voltage, the anode of the light emitting device is reset under the action of the second reset signal, and the coupling module is configured to cause the potential of the target pole of the driving transistor to change in coupling again in response to the second scan signal, so as to increase the potential of the target pole of the driving transistor. In the second light emitting stage, the light emitting control module is configured to cause the first pole and the second pole of the driving transistor to be connected to a voltage respectively, so as to form a driving current path, and the driving transistor is configured to provide a driving current to the light emitting device.

14. The driving method of the pixel circuit according to claim 13, wherein The pixel circuit further comprises a first storage module, a first end of the first storage module is configured to receive a first power voltage, and a second end of the first storage module is connected with the first pole of the driving transistor; and the driving method further comprises a second write stage. In the first write stage, the first end of the first storage module receives the first power voltage, and the second end of the first storage module receives the data voltage, so as to store the data voltage. In the second write stage, the first storage module charges the gate of the driving transistor, so as to increase the potential of the gate of the driving transistor.

15. A display panel, characterized by The pixel circuit comprises a light emitting device and a pixel circuit according to any one of claims 1-11, the pixel circuit is connected with the light emitting device, and is configured to drive the light emitting device to emit light.

16. A display device comprising: The display panel as claimed in claim 15 is included.

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