Pixel circuit and display panel

Abstract

The present invention discloses a pixel circuit and a display panel, wherein the pixel circuit comprises a data writing module, a driving module, a first light-emitting control module, a potential regulating module and a light-emitting module; the data writing module is used to transmit a data voltage to the driving module; the driving module comprises a driving transistor, the driving transistor is used to generate a driving signal according to the data voltage transmitted by the data writing module, and drive the light-emitting module to emit light; the first light-emitting control module is connected to the light-emitting module; the potential regulating module is connected between the first end of the driving transistor and the first light-emitting control module, and is used to regulate the potential of the first end of the driving transistor, and the first end of the driving transistor is an end for outputting the driving signal. The potential regulating module regulates the potential of the first end of the driving transistor, so that the absolute value of the voltage difference between the gate and the first end of the driving transistor becomes larger, thereby increasing the initialization degree of the driving transistor, improving the ability of the driving transistor to release electrons, and improving the display effect of the screen under low frequency.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a pixel circuit and a display panel. Background Art

[0002] As the demand for longer standby time of display products increases, low-frequency display is the general trend. Existing display panels usually include pixel circuits, which include transistors. Integrating low-temperature polysilicon transistors and metal oxide transistors on the same substrate is the main solution to achieve low-frequency driving.

[0003] However, low-frequency driving has the problem of screen flickering, which will seriously affect the display effect of the screen under low frequency. Summary of the invention

[0004] The present invention provides a pixel circuit and a display panel to solve the problem of screen flickering under low frequency and improve the display effect of the screen under low frequency.

[0005] According to one aspect of the present invention, a pixel circuit is provided, the pixel circuit comprising a data writing module, a driving module, a first light emitting control module, a potential regulating module and a light emitting module;

[0006] The data writing module is used to transmit data voltage to the driving module;

[0007] The driving module comprises a driving transistor, and the driving transistor is used to generate a driving signal according to the data voltage transmitted by the data writing module to drive the light-emitting module to emit light;

[0008] The first light emitting control module is connected to the light emitting module;

[0009] The potential regulating module is connected between the first end of the driving transistor and the first light emitting control module, and is used to regulate the potential of the first end of the driving transistor. The first end of the driving transistor is a terminal for outputting a driving signal.

[0010] Optionally, the potential regulating module is used to increase the potential of the first end of the driving transistor before and / or after the data writing module transmits the data voltage.

[0011] Optionally, the pixel circuit further includes an initialization module, a storage module, a compensation module and a second light emitting control module;

[0012] The initialization module is connected to the initialization signal line, the gate of the driving transistor and the light emitting module, and is used to transmit an initialization voltage to the gate of the driving transistor and the light emitting module;

[0013] The data writing module is connected between the data line and the second end of the driving transistor;

[0014] The compensation module is connected between the gate of the driving transistor and the first end of the driving transistor, and is used to compensate for the threshold voltage of the driving transistor;

[0015] The second light emitting control module is connected between the second end of the driving transistor and the first power supply;

[0016] The storage module is connected between the first power source and the gate of the driving transistor;

[0017] The potential regulating module is connected between the first end of the driving transistor and the first light emitting control module, and the light emitting module is connected between the first light emitting control module and a second power supply; the potential regulating module is used to increase the potential of the first end of the driving transistor in response to a signal on a first control signal line.

[0018] Optionally, the potential regulating module includes a first transistor and a first capacitor;

[0019] A first electrode of the first transistor is connected to a first end of the driving transistor, a second electrode of the first transistor is connected to a first end of the first light emitting control module, and a gate of the first transistor is connected to a first control signal line;

[0020] The second end of the first light control module is connected to the first end of the light emitting module, and the second end of the light emitting module is connected to a second power source;

[0021] A first electrode of the first capacitor is connected to a first electrode of the first transistor, and a second electrode of the first capacitor is connected to a gate of the first transistor.

[0022] Optionally, the data writing module includes a second transistor, the first light emitting control module includes a third transistor, the initialization module includes a fourth transistor and a fifth transistor, the compensation module includes a sixth transistor, the second light emitting control module includes a seventh transistor, the storage module includes a second capacitor, and the initialization signal line includes a first initialization signal line and a second initialization signal line;

[0023] The first electrode of the second transistor is connected to the data line, the second electrode of the second transistor is connected to the second end of the driving transistor, and the gate of the second transistor is connected to the first scan line; the first electrode of the third transistor is connected to the second electrode of the first transistor, the second electrode of the third transistor is connected to the first end of the light emitting module, and the gate of the third transistor is connected to the second control signal line; the first electrode of the fourth transistor is connected to the first initialization signal line, the second electrode of the fourth transistor is connected to the gate of the driving transistor, and the gate of the fourth transistor is connected to the second scan line; the first electrode of the fifth transistor is connected to the second initialization signal line, the second electrode of the fifth transistor is connected to the first end of the light emitting module, and the gate of the fifth transistor is connected to the third scan line; the first electrode of the sixth transistor is connected to the first end of the driving transistor, the second electrode of the sixth transistor is connected to the gate of the driving transistor, and the gate of the sixth transistor is connected to the fourth scan line; the first electrode of the seventh transistor is connected to the first power supply, the second electrode of the seventh transistor is connected to the second end of the driving transistor, and the gate of the seventh transistor is connected to the second control signal line; the first electrode of the second capacitor is connected to the first power supply, and the second electrode of the second capacitor is connected to the gate of the driving transistor.

[0024] Optionally, the pixel circuit also includes a third capacitor; a first electrode of the third capacitor is connected to the gate of the second transistor, a second electrode of the third capacitor is connected to the gate of the driving transistor, and the third capacitor is used to stabilize the voltage of the gate of the driving transistor.

[0025] Optionally, a pulse duration of the pulse signal on the first control signal line is greater than a pulse duration on the first scan line, the second scan line, the third scan line and the fourth scan line.

[0026] Optionally, the drain of the driving transistor is the first terminal of the driving transistor. Optionally, the potential regulating module is used to increase the potential of the first terminal of the driving transistor after the compensation module is turned off and during the period when the first light emitting control module is turned off.

[0027] According to another aspect of the present invention, a display panel is provided. The display panel includes any one of the above-mentioned pixel circuits.

[0028] The pixel circuit and display panel provided by the embodiment of the present invention include a data writing module, a driving module, a first light-emitting control module, a potential regulating module and a light-emitting module; the data writing module is used to transmit a data voltage to the driving module; the driving module includes a driving transistor, the driving transistor is used to generate a driving signal according to the data voltage transmitted by the data writing module, and drive the light-emitting module to emit light; the first light-emitting control module is connected to the light-emitting module; the potential regulating module is connected between the first end of the driving transistor and the first light-emitting control module, and is used to adjust the potential of the first end of the driving transistor, and the first end of the driving transistor is an end for outputting the driving signal. The potential regulating module adjusts the potential of the first end of the driving transistor before the light-emitting stage, which can increase the absolute value of the voltage difference between the gate of the driving transistor and the first end of the driving transistor, increase the initialization degree of the driving transistor, improve the ability of the driving transistor to release electrons, and improve the display effect of the screen under low frequency.

[0029] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 is a structural schematic diagram of a pixel circuit provided according to an embodiment of the present invention;

[0032] Figure 2 is a schematic structural diagram of another pixel circuit provided according to an embodiment of the present invention;

[0033] Figure 3 is a working state diagram of a driving transistor of a pixel circuit in an initialization stage according to an embodiment of the present invention;

[0034] Figure 4 is a graph showing the relationship between the number of electrons captured by the first end of a driving transistor and time in an initialization phase of a pixel circuit provided by an embodiment of the present invention;

[0035] Figure 5 is a working state diagram of a driving transistor of a pixel circuit in a light emitting stage according to an embodiment of the present invention;

[0036] Figure 6is a graph showing the relationship between the number of electrons captured by the first end of the driving transistor and time in a light emitting stage of a pixel circuit provided by an embodiment of the present invention;

[0037] Figure 7 is a graph showing the relationship between a driving current generated by a driving transistor and time in a light emitting stage of a pixel circuit provided by an embodiment of the present invention;

[0038] Figure 8 is a simulation diagram of a driving current of a pixel circuit in a light emitting stage provided according to an embodiment of the present invention;

[0039] Fig. 9 is a schematic structural diagram of another pixel circuit provided according to an embodiment of the present invention;

[0040] Fig.10 is a timing diagram of a pixel circuit provided according to an embodiment of the present invention;

[0041] Fig.11 is a structural schematic diagram of another pixel circuit provided according to an embodiment of the present invention;

[0042] Fig.12 is a schematic structural diagram of a display device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] As described in the background technology, the pixel circuit of the existing display panel is prone to screen flickering under low-frequency driving. The inventor has found that the reason for the above problem is that in the light-emitting stage, the first end of the driving transistor (the end that outputs the driving signal) continuously captures electrons until the driving transistor generates a stable driving current to ensure stable light emission. In the initialization stage, the written initialization voltage controls the driving transistor to release the captured electrons so that the electrons can be recaptured in the light-emitting stage. However, in the existing pixel circuit, in the initialization stage, the initialization degree of the driving transistor is insufficient, and the absolute value of the voltage difference between the gate and the first end of the driving transistor is small, resulting in a poor ability of the driving transistor to release electrons. In the prior art, in order to increase the absolute value of the voltage difference between the gate and the first end of the driving transistor to improve the ability of the driving transistor to release electrons, the initialization voltage written into the gate of the driving transistor is generally reduced. However, after the initialization voltage is reduced, in the subsequent data writing stage, within a certain period of time, the data voltage written into the gate of the driving transistor will be insufficient, thereby affecting the light-emitting effect of the light-emitting module.

[0046] In order to solve the above problems, an embodiment of the present invention provides a pixel circuit. Figure 1 A schematic diagram of a pixel circuit according to an embodiment of the present invention is provided. Figure 1 , the pixel circuit includes a data writing module 10, a driving module 11, a first light emitting control module 12, a potential regulating module 13 and a light emitting module 14;

[0047] The data writing module 10 is used to transmit data voltage to the driving module 11;

[0048] The driving module 11 includes a driving transistor T0, and the driving transistor T0 is used to generate a driving signal according to the data voltage transmitted by the data writing module 10, so as to drive the light-emitting module 14 to emit light;

[0049] The first light emitting control module 12 is connected to the light emitting module 14;

[0050] The potential adjustment module 13 is connected between the first end D of the driving transistor T0 and the first light control module 12 and is used to adjust the potential of the first end D of the driving transistor T0 . The first end D of the driving transistor T0 is a terminal for outputting a driving signal.

[0051] Optionally, the pixel circuit further includes a storage module 16, a compensation module 17 and a second light emitting control module 18;

[0052] The data writing module 10 is connected between the data line Vdata and the second end S of the driving transistor T0;

[0053] The compensation module 17 is connected between the gate G of the driving transistor T0 and the first terminal D of the driving transistor T0, and is used to compensate for the threshold voltage of the driving transistor T0;

[0054] The second light emitting control module 18 is connected between the second end S of the driving transistor T0 and the first power source Vdd;

[0055] The storage module 16 is connected between the first power source Vdd and the gate G of the driving transistor T0;

[0056] The potential regulating module 13 is connected between the first end D of the driving transistor T0 and the first light-emitting control module 12, and the light-emitting module 14 is connected between the first light-emitting control module 12 and the second power supply Vss; the potential regulating module 13 is used to increase the potential of the first end D of the driving transistor T0 in response to the signal on the first control signal line EM1.

[0057] The data line Vdata is used to provide a data voltage, the first power supply Vdd is used to provide a high potential, and the second power supply Vss is used to provide a low potential. The light-emitting module 14 can be an organic light emitting diode (OLED), and the light-emitting module 14 emits light according to a driving signal output by the driving transistor T0, wherein the driving signal can be a driving current generated by the driving transistor T0 according to the voltage of its gate G and the second terminal S. Optionally, the drain of the driving transistor T0 is the first terminal D of the driving transistor T0. The driving transistor T0 is a P-type transistor, the drain of the driving transistor T0 serves as the first terminal D of the driving transistor T0, and the source is the second terminal S of the driving transistor T0.

[0058] Specifically, the operation process of the pixel circuit may include two stages. In the data writing stage, the data writing module 10 is turned on, the compensation module 17 is turned on, the first light-emitting control module 12 is turned off, the second light-emitting control module 18 is turned off, and the potential adjustment module 13 is turned on. The data voltage provided by the data line Vdata is written into the gate G of the driving transistor T0 through the data writing module 10 and the driving transistor T0 to complete the writing of the data voltage. In the light-emitting stage, the data writing module 10 is turned off, the compensation module 17 is turned off, the first light-emitting control module 12 is turned on, the second light-emitting control module 18 is turned on, and the potential adjustment module 13 is turned on. The first power supply voltage provided by the first power supply Vdd is transmitted to the second terminal S of the driving transistor T0. The driving transistor T0 outputs a driving signal according to the voltage of its gate G and the second terminal S to drive the light-emitting module 14 to emit light. The potential adjustment module 13 is used to adjust the potential of the first terminal D of the driving transistor T0 before the light-emitting stage. Specifically, the potential of the first terminal D of the driving transistor T0 can be adjusted by adjusting the potential of the first control signal line EM1 connected to the control terminal of the potential adjustment module 13. Exemplarily, when the signal on the first control signal line EM1 connected to the control end of the potential regulating module 13 jumps from a low potential to a high potential, the potential of the first end D of the driving transistor T0 rises, thereby increasing the absolute value of the voltage difference between the gate G of the driving transistor T0 and the first end D of the driving transistor T0, thereby improving the ability of the driving transistor T0 to release electrons and improving the display effect of the screen under low frequency. Compared with the prior art, in which the initialization voltage written to the gate G of the driving transistor T0 is reduced to improve the ability of the driving transistor T0 to release electrons, the present embodiment does not need to reduce the initialization voltage of the gate G of the driving transistor T0 to improve the ability of the driving transistor T0 to release electrons, thereby avoiding the problem of insufficient data voltage written to the gate of the driving transistor T0 during the data writing stage after reducing the initialization voltage.

[0059] The potential regulating module regulates the potential of the first end of the driving transistor before the light-emitting stage, which can increase the voltage difference between the gate and the first end of the driving transistor, increase the initialization degree of the driving transistor, enhance the ability of the driving transistor to release electrons, and enhance the display effect of the screen under low frequency.

[0060] Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2 Optionally, the pixel circuit further includes an initialization module 15 , which is connected to the initialization signal line Vref, the gate G of the driving transistor T0 and the light emitting module 14 , and is used to transmit an initialization voltage to the gate G of the driving transistor T0 and the light emitting module 14 .

[0061] In this embodiment, the working process of the pixel circuit may include an initialization phase, a data voltage writing and threshold compensation phase, a potential adjustment phase, and a light emitting phase. In this embodiment, the potential adjustment phase is exemplarily shown to be located between the data voltage writing and threshold compensation phase and the light emitting phase, and the potential adjustment module 13 increases the potential of the first terminal D of the driving transistor T0 in the potential adjustment phase.

[0062] In the initialization stage, the initialization module 15 is turned on, the data writing module 10 is turned off, the first light-emitting control module 12 is turned off, the second light-emitting control module 18 is turned off, the potential adjustment module 13 is turned on, and the compensation module 17 is turned off. The initialization voltage provided by the initialization signal line Vref is written into the gate G of the driving transistor T0 to initialize the gate G of the driving transistor T0. At the same time, in the initialization stage, the initialization voltage is written into the light-emitting module 14 to avoid the influence of the residual charge of the light-emitting module 14 on the display effect. Figure 3 A working state diagram of a driving transistor of a pixel circuit in an initialization stage provided by an embodiment of the present invention, Figure 4 A graph showing the relationship between the number of electrons captured by the first end of the driving transistor and time in an initialization phase of a pixel circuit provided by an embodiment of the present invention, Figure 4 The horizontal axis is time (unit: s), and the vertical axis is the charge TQ (unit: C) of the electron e captured by the first end D. Figure 2 , Figure 3 and Figure 4 , exemplarily, in the initialization stage, the gate voltage VG of the gate G of the driving transistor T0 is -3V, the voltage VS of the second terminal S is 1.1V, and the voltage VD of the first terminal D is 1.1V. In the initialization stage, the driving transistor is controlled to release the captured electron e so that the electron e can be recaptured in the light-emitting stage. As the initialization proceeds, the charge TQ of the captured electron e is continuously released, and the charge TQ eventually tends to zero.

[0063] During the data voltage writing and threshold compensation stage, the initialization module 15 is turned off, the data writing module 10 is turned on, the first light-emitting control module 12 is turned off, the second light-emitting control module 18 is turned off, the potential adjustment module 13 is turned on, and the compensation module 17 is turned on. The data voltage provided by the data line Vdata is written into the gate G of the driving transistor T0 via the data writing module 10, the driving transistor T0, and the compensation module 17. Since the compensation module 17 can compensate for the threshold of the driving transistor T0, the voltage of the gate G of the driving transistor T0 can include a voltage associated with the data voltage and the threshold voltage, thereby realizing the writing of the data voltage and the threshold compensation of the driving transistor T0.

[0064] Optionally, the potential regulating module 13 is used to increase the potential of the first end D of the driving transistor T0 after the compensation module 17 is turned off and during the period when the first light emitting control module 12 is turned off. After the data voltage writing and threshold compensation phases are completed, the compensation module 17 is turned off, and the pixel circuit can enter the potential regulating phase. In the potential regulating phase, the initialization module 15 is turned off, the data writing module 10 is turned off, the first light emitting control module 12 is turned off, the second light emitting control module 18 is turned off, the compensation module 17 is turned off, and the potential regulating module 13 is turned on. The potential regulating module 13 responds to the signal on the first control signal line EM1. Exemplarily, the signal on the first control signal line EM1 is always at a low potential during the initialization stage and the data voltage writing and threshold compensation stage, and jumps to a high potential during the potential adjustment stage. The change of the signal on the first control signal line EM1 causes the potential of the first end D of the driving transistor T0 to be raised, thereby increasing the absolute value of the voltage difference between the gate of the driving transistor T0 and the first end D of the driving transistor T0, increasing the initialization degree of the driving transistor T0, improving the ability of the driving transistor T0 to release electrons, and improving the display effect of the screen under low frequency.

[0065] In the light-emitting stage, the initialization module 15 is turned off, the data writing module 10 is turned off, the first light-emitting control module 12 is turned on, the second light-emitting control module 18 is turned on, the compensation module 17 is turned off, and the potential adjustment module 13 is turned on. The second light-emitting control module 18 transmits the first power supply voltage provided by the first power supply Vdd to the second terminal S of the driving transistor T0. The driving transistor T0 outputs a driving signal according to the voltage of its gate G and the second terminal S to drive the light-emitting module 14 to emit light. Figure 5 A working state diagram of a driving transistor of a pixel circuit in a light emitting stage provided by an embodiment of the present invention, Figure 6 A graph showing the relationship between the number of electrons captured by the first end of the driving transistor and time in a pixel circuit provided by an embodiment of the present invention during a light emitting stage, Figure 7 A graph showing the relationship between a driving current generated by a driving transistor and time in a pixel circuit provided by an embodiment of the present invention during a light emitting phase, Figure 8 A simulation diagram of a driving current of a pixel circuit in a light emitting stage provided by an embodiment of the present invention, Figure 6 The horizontal axis is time (unit: s), and the vertical axis is the charge TQ (unit: C) of the electron e captured by the first terminal D of the driving transistor T0. Figure 7 The horizontal axis is time (unit: s), and the vertical axis is the driving current Id (unit: mA) generated by the driving transistor T0. Figure 8 The horizontal axis is time (unit: s), and the vertical axis is the driving current Id (unit: mA) generated by the driving transistor T0. Figure 2 , Figure 5-Figure 8, exemplarily, in the light-emitting stage, the gate voltage VG of the gate G of the driving transistor T0 is 2.3V, the voltage VS of the second terminal S of the driving transistor T0 is 4.6V, and the voltage VD of the first terminal D of the driving transistor T0 is -0.4V. In the light-emitting stage, the first terminal D of the driving transistor T0 continuously captures electrons until the driving transistor TO generates a stable driving current Id to ensure stable light emission.

[0066] Continue to refer Figure 2 Optionally, the potential adjustment module 13 is used to increase the potential of the first end D of the driving transistor T0 before and / or after the data writing module 10 transmits the data voltage.

[0067] The signal on the first control signal line EM1 can jump from a low potential to a high potential before the data writing module 10 transmits the data voltage (i.e., before the data writing stage), so that the potential of the first terminal D of the driving transistor T0 rises, and the absolute value of the voltage difference between the gate G of the driving transistor T0 and the first terminal D of the driving transistor T0 increases, thereby improving the ability of the driving transistor T0 to release electrons. Specifically, when the pixel circuit includes an initialization module 15, the potential adjustment module 13 can increase the potential of the first terminal D of the driving transistor T0 before the initialization stage, during the initialization stage, or at least one stage between the initialization stage and the data writing stage; or, the signal on the first control signal line EM1 can jump from a low potential to a high potential after the data writing module 10 transmits the data voltage and before the driving transistor T0 emits light (i.e., after the data writing stage and before the light emitting stage); or, the signal on the first control signal line EM1 can jump from a low potential to a high potential before the data writing stage, thereby increasing the potential of the first terminal D of the driving transistor T0, and in the data writing stage, the first terminal D of the driving transistor T0 is increased. The signal on a control signal line EM1 jumps from a high potential back to a low potential. After the data writing stage and before the light-emitting stage, the signal on the first control signal line EM1 jumps from a low potential to a high potential again. That is, the potential regulating module 13 can increase the potential of the first terminal D of the driving transistor T0 before the initialization stage, during the initialization stage, and at least one stage between the initialization stage and the data writing stage. At the same time, it also increases the potential of the first terminal D of the driving transistor T0 between the data writing stage and the light-emitting stage. Therefore, the potential regulating module 13 increases the voltage of the first terminal D of the driving transistor T0 at least twice during the operation process to further enhance the ability of the driving transistor T0 to release electrons.

[0068] Continue to refer Figure 2 , Optionally, the potential regulating module 13 includes a first transistor T1 and a first capacitor C1;

[0069] A first electrode of the first transistor T1 is connected to a first end D of the driving transistor T0, a second electrode of the first transistor T1 is connected to a first end of the first light emitting control module 12, and a gate of the first transistor T1 is connected to a first control signal line EM1;

[0070] The second end of the first light emitting control module 12 is connected to the first end of the light emitting module 14, and the second end of the light emitting module 14 is connected to the second power source Vss;

[0071] A first electrode of the first capacitor C1 is connected to a first electrode of the first transistor T1 , and a second electrode of the first capacitor C1 is connected to a gate of the first transistor T1 .

[0072] The first transistor T1 can be an N-type transistor or a P-type transistor. In this embodiment, the first transistor T1 is exemplarily shown to be a P-type transistor. Optionally, the signal on the first control signal line EM1 includes a pulse signal that jumps from a low potential to a high potential for a preset time and then jumps to a low potential. The signal on the first control signal line EM1 is a low potential in the non-potential adjustment stage, and the first transistor T1 is in an on state. In the potential adjustment stage, the signal on the first control signal line EM1 jumps from a low potential to a high potential and lasts for a preset time. At this time, the first transistor T1 is turned off. Since the potential of the second pole of the first capacitor C1 jumps from a low potential to a high potential, due to coupling, the voltage at the first pole of the first capacitor C1 increases, thereby raising the potential of the first end D of the driving transistor T0. Taking the potential adjustment stage between the data voltage writing and threshold compensation stage and the light emitting stage as an example, after the data voltage writing and threshold compensation stage, the voltage VG of the gate G of the driving transistor T0 is V1-|Vth|, where V1 is the data voltage provided by the data line Vdata, and the voltage VD of the first terminal D of the driving transistor T0 is V1, and both VG and VD are greater than zero. Therefore, the absolute value of the voltage difference between the gate and the first terminal D of the driving transistor T0 is |VGD|=|VG-VD|=|Vth|. After the potential adjustment stage, the potential of the first terminal D of the driving transistor T0 is raised to V2, V2>V1. At this time, the absolute value of the voltage difference between the gate of the driving transistor T0 and the first terminal D of the driving transistor T0 is |VGD|=|VG-VD|=|Vth|. ， |=|VG-VD|=V2-V1+|Vth|, from this we can know that |VGD ，>|VGD|. Therefore, after the voltage of the first terminal D of the driving transistor T0 is raised, the absolute value of the voltage difference between the gate of the driving transistor T0 and the first terminal D of the driving transistor T0 increases, thereby improving the ability of the driving transistor T0 to release electrons, increasing the initialization degree of the driving transistor T0, and improving the display effect of the screen under low frequency. After the potential adjustment stage is over, the signal on the first control signal line EM1 jumps from a high potential to a low potential, so that the first transistor T1 is turned on, so that in the light-emitting stage, the driving signal generated by the driving transistor T0 can be transmitted to the light-emitting module 14.

[0073] Fig. 9 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2 and 9 Optionally, the data writing module 10 includes a second transistor T2, the first light emitting control module 12 includes a third transistor T3, the initialization module 15 includes a fourth transistor T4 and a fifth transistor T5, the compensation module 17 includes a sixth transistor T6, the second light emitting control module 18 includes a seventh transistor T7, the storage module 16 includes a second capacitor C2, and the initialization signal line Vref includes a first initialization signal line Vref1 and a second initialization signal line Vref2;

[0074] The first electrode of the second transistor T2 is connected to the data line Vdata, the second electrode of the second transistor T2 is connected to the second end S of the driving transistor T0, and the gate of the second transistor T2 is connected to the first scan line S1; the first electrode of the third transistor T3 is connected to the second electrode of the first transistor T1, the second electrode of the third transistor T3 is connected to the first end of the light emitting module 14, and the gate of the third transistor T3 is connected to the second control signal line EM2; the first electrode of the fourth transistor T4 is connected to the first initialization signal line Vref1, the second electrode of the fourth transistor T4 is connected to the gate G of the driving transistor T0, and the gate of the fourth transistor T4 is connected to the second scan line S2; the first electrode of the fifth transistor T5 is connected to the second initialization signal line V ref2, the second electrode of the fifth transistor T5 is connected to the first end of the light emitting module 14, and the gate of the fifth transistor T5 is connected to the third scanning line S3; the first electrode of the sixth transistor T6 is connected to the first end D of the driving transistor T0, the second electrode of the sixth transistor T6 is connected to the gate G of the driving transistor T0, and the gate of the sixth transistor T6 is connected to the fourth scanning line S4; the first electrode of the seventh transistor T7 is connected to the first power supply Vdd, the second electrode of the seventh transistor T7 is connected to the second end S of the driving transistor T0, and the gate of the seventh transistor T7 is connected to the second control signal line EM2; the first electrode of the second capacitor C2 is connected to the first power supply Vdd, and the second electrode of the second capacitor C2 is connected to the gate G of the driving transistor T0.

[0075] The driving transistor T0, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6 and the seventh transistor T7 may be P-type transistors or N-type transistors. In this embodiment, the fourth transistor T4 and the sixth transistor T6 are N-type transistors, and the remaining transistors are P-type transistors. The fourth transistor T4 and the sixth transistor T6 are N-type transistors, which can reduce the leakage current of the gate G of the driving transistor T0, which is conducive to ensuring the stability of the voltage of the gate G of the driving transistor T0 and improving the display effect of the screen.

[0076] Fig.10 A timing diagram of a pixel circuit provided by an embodiment of the present invention, Fig.10 The timing diagram shown is applicable to Fig. 9 The pixel circuit of the embodiment includes an initialization phase t11, a data voltage writing and threshold compensation phase t12, a potential adjustment phase t13, and a light emitting phase t14.

[0077] In the initialization stage t11, the signals on the first scan line S1 and the second control signal line EM2 are at high potential, the second transistor T2, the seventh transistor T7 and the third transistor T3 are turned off, the signal on the first scan line S1 is at high potential, the fifth transistor T5 is turned off, and the signals on the fourth scan line S4 and the first control signal line EM1 are both at low potential, so that the sixth transistor T6 is turned off and the first transistor T1 is turned on, the signal on the second scan line S2 is at high potential, so that the fourth transistor T4 is turned on, and the first initialization voltage provided by the first initialization signal line Vref1 is written into the gate G of the driving transistor T0, thereby completing the initialization of the driving transistor T0.

[0078] In the data voltage writing and threshold compensation stage t12, the signal on the second scan line S2 is low, so that the fourth transistor T4 is turned off, the signal on the second control signal line EM2 is high, so that the seventh transistor T7 and the third transistor T3 are turned off, the signal on the first control signal line EM1 is low, so that the first transistor T1 is turned on, the signal on the first scan line S1 is low, so that the second transistor T2 is turned on, the signal on the fourth scan line S4 is high, so that the sixth transistor T6 is turned on, and the data voltage provided by the data line Vdata is written into the gate G of the driving transistor T0 through the turned-on second transistor T2, the driving transistor T0, and the sixth transistor T6, so as to achieve the writing of the data voltage of the gate G of the driving transistor T0 and the compensation of the threshold voltage. In this stage, the signal on the third scan line S3 is low, so that the fifth transistor T5 is turned on, and the second initialization voltage provided by the second initialization signal line Vref2 is written into the first end of the light-emitting module 14, eliminating the influence of the residual charge on the light-emitting module 14.

[0079] In the potential adjustment stage t13, the signal on the first scan line S1 is high, so that the second transistor T2 is turned off, the fifth transistor T5 is turned off, the signal on the second scan line S2 is low, so that the fourth transistor T4 is turned off, the signal on the third scan line S3 is high, so that the fifth transistor T5 is turned off, the signal on the fourth scan line S4 is low, so that the sixth transistor T6 is turned off, and the signal on the second control signal line EM2 is high, so that the seventh transistor T7 and the third transistor T3 are turned off. The potential on the first control signal line EM1 jumps from a low potential to a high potential, so that the voltage at the second electrode of the first capacitor C1 increases, and through the coupling effect of the first capacitor C1, the voltage at the first electrode of the first capacitor C1 also increases, thereby raising the voltage of the first terminal D of the driving transistor T0, so that the absolute value of the voltage difference between the gate G of the driving transistor T0 and the first terminal D of the driving transistor T0 increases, and the ability of the driving transistor T0 to release electrons is improved. Optionally, the pulse duration of the pulse signal on the first control signal line EM1 is greater than the pulse durations on the first scan line S1, the second scan line S2, the third scan line S3, and the fourth scan line S4. The pulse duration of the pulse signal on the first control signal line EM1 is longer, which can make the potential jump at the gate of the first transistor T1 more sufficient, so that the voltage increase at the second electrode of the first capacitor C1 can reach the difference between the high potential and the low potential on the first control line EM1, and then through the coupling effect of the first capacitor C1, the voltage of the first end D of the driving transistor T0 can be fully raised, which is conducive to increasing the absolute value of the voltage difference between the gate G of the driving transistor T0 and the first end D of the driving transistor T0, and improving the ability of the driving transistor T0 to release electrons.

[0080] In the light-emitting stage t14, the signal on the first scan line S1 is at a high potential, so that the second transistor T2 is turned off, the signal on the second scan line S2 is at a low potential, so that the fourth transistor T4 is turned off, the signal on the third scan line S3 is at a high potential, so that the fifth transistor T5 is turned off, the signal on the fourth scan line S4 is at a low potential, and the sixth transistor T6 is turned off, the signal on the first control signal line EM1 is at a low potential, the first transistor T1 is turned on, the signal on the second control signal line EM2 is at a low potential, so that the seventh transistor T7 and the third transistor T3 are turned on, and the first power supply voltage provided by the first power supply Vdd is transmitted to the second end S of the driving transistor T0, and the driving transistor T0 generates a driving current according to the voltage of its gate G and the second end S of the driving transistor T0, so as to drive the light-emitting module 14 to emit light.

[0081] It should be noted that the high potential in the embodiment of the present invention is a high level, and the low potential is a low level. The high potential and the low potential are relative, and the embodiment of the present invention does not limit it as long as it is a voltage that can control the on or off of the transistor. For example, a high potential controls the transistor to be on, and a low potential controls the transistor to be off; or a high potential controls the transistor to be off, and a low potential controls the transistor to be on.

[0082] Fig.11 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 5 Optionally, the pixel circuit also includes a third capacitor C3, a first electrode of the third capacitor C3 is connected to the gate of the second transistor T2, a second electrode of the third capacitor C3 is connected to the gate G of the driving transistor T0, and the third capacitor C3 is used to stabilize the voltage of the gate G of the driving transistor T0.

[0083] Fig.10 The timing diagram of the pixel circuit shown also applies to Fig.11 The pixel circuit shown in Figure 2 is shown in Figure 2. Fig.10 and Fig.11, the pulse interval of the first scan line S1 is within the pulse interval of the fourth scan line S4, and the time when the signal on the first scan line S1 jumps from a low potential to a high potential is earlier than the time when the signal on the fourth scan line S4 jumps from a high potential to a low potential. When the data voltage writing and threshold compensation phase t12 ends and the signal on the fourth scan line S4 jumps from a high potential to a low potential, the voltage of the gate G of the driving transistor T0 is reduced due to the coupling effect of the parasitic capacitance of the sixth transistor T6 itself. In order to eliminate the influence of the signal jump of the gate of the sixth transistor T6 on the potential of the gate G of the driving transistor T0, the third capacitor C3 is connected between the gate of the second transistor T2 and the gate G of the driving transistor T0. Before the signal of the fourth scan line S4 jumps, after the signal of the first scan line S1 connected to the second transistor T2 jumps from a low potential to a high potential, the potential of the first electrode of the third capacitor C3 increases, and through the coupling effect of the third capacitor C3, the potential of the second electrode of the third capacitor C3 also increases, thereby raising the potential of the gate G of the driving transistor T0, so as to offset as much as possible the response of the subsequent signal jump of the gate of the sixth transistor T6 to the potential of the gate G of the driving transistor T0.

[0084] An embodiment of the present invention further provides a display panel, which includes the pixel circuit in any of the above embodiments. The display panel has the same beneficial effects as the above pixel circuit, which will not be described in detail in this embodiment.

[0085] An embodiment of the present invention further provides a display device, Fig.12 A schematic diagram of a display device according to an embodiment of the present invention is provided. Fig.12 The display device 01 includes the above-mentioned display panel 02. The display device 01 can be Fig.12 The mobile phone shown may also be a computer, a television, a smart wearable display device, etc., and the embodiments of the present invention do not specifically limit this.

[0086] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0087] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pixel circuit, characterized in that: It includes a data writing module, a driving module, a first light-emitting control module, a potential regulating module and a light-emitting module; The data writing module is used to transmit data voltage to the driving module; The driving module comprises a driving transistor, and the driving transistor is used to generate a driving signal according to the data voltage transmitted by the data writing module to drive the light-emitting module to emit light; The first light emitting control module is connected to the light emitting module; The potential adjustment module is connected between the first end of the driving transistor and the first light emitting control module, and is used to adjust the potential of the first end of the driving transistor, where the first end of the driving transistor is a terminal for outputting a driving signal; The potential regulating module includes a first transistor and a first capacitor; A first electrode of the first transistor is connected to a first end of the driving transistor, a second electrode of the first transistor is connected to a first end of the first light emitting control module, and a gate of the first transistor is connected to a first control signal line; The second end of the first light control module is connected to the first end of the light emitting module, and the second end of the light emitting module is connected to a second power source; A first electrode of the first capacitor is connected to a first electrode of the first transistor, and a second electrode of the first capacitor is connected to a gate of the first transistor.

2. The pixel circuit according to claim 1, characterized in that: The potential regulating module is used to increase the potential of the first end of the driving transistor before and / or after the data writing module transmits the data voltage.

3. The pixel circuit according to claim 1, characterized in that: It also includes an initialization module, a storage module, a compensation module and a second light-emitting control module; The initialization module is connected to the initialization signal line, the gate of the driving transistor and the light emitting module, and is used to transmit an initialization voltage to the gate of the driving transistor and the light emitting module; The data writing module is connected between the data line and the second end of the driving transistor; The compensation module is connected between the gate of the driving transistor and the first end of the driving transistor, and is used to compensate for the threshold voltage of the driving transistor; The second light emitting control module is connected between the second end of the driving transistor and the first power supply; The storage module is connected between the first power source and the gate of the driving transistor; The potential regulating module is connected between the first end of the driving transistor and the first light emitting control module, and the light emitting module is connected between the first light emitting control module and a second power supply; the potential regulating module is used to increase the potential of the first end of the driving transistor in response to a signal on a first control signal line.

4. The pixel circuit according to claim 3, characterized in that: The data writing module includes a second transistor, the first light emitting control module includes a third transistor, the initialization module includes a fourth transistor and a fifth transistor, the compensation module includes a sixth transistor, the second light emitting control module includes a seventh transistor, the storage module includes a second capacitor, and the initialization signal line includes a first initialization signal line and a second initialization signal line; The first electrode of the second transistor is connected to the data line, the second electrode of the second transistor is connected to the second end of the driving transistor, and the gate of the second transistor is connected to the first scan line; the first electrode of the third transistor is connected to the second electrode of the first transistor, the second electrode of the third transistor is connected to the first end of the light emitting module, and the gate of the third transistor is connected to the second control signal line; the first electrode of the fourth transistor is connected to the first initialization signal line, the second electrode of the fourth transistor is connected to the gate of the driving transistor, and the gate of the fourth transistor is connected to the second scan line; the first electrode of the fifth transistor is connected to the second initialization signal line, the second electrode of the fifth transistor is connected to the first end of the light emitting module, and the gate of the fifth transistor is connected to the third scan line; the first electrode of the sixth transistor is connected to the first end of the driving transistor, the second electrode of the sixth transistor is connected to the gate of the driving transistor, and the gate of the sixth transistor is connected to the fourth scan line; the first electrode of the seventh transistor is connected to the first power supply, the second electrode of the seventh transistor is connected to the second end of the driving transistor, and the gate of the seventh transistor is connected to the second control signal line; the first electrode of the second capacitor is connected to the first power supply, and the second electrode of the second capacitor is connected to the gate of the driving transistor.

5. The pixel circuit according to claim 4, characterized in that: It also includes a third capacitor; a first electrode of the third capacitor is connected to the gate of the second transistor, a second electrode of the third capacitor is connected to the gate of the driving transistor, and the third capacitor is used to stabilize the voltage of the gate of the driving transistor.

6. The pixel circuit according to claim 4, characterized in that: A pulse duration of the pulse signal on the first control signal line is greater than a pulse duration on the first scan line, the second scan line, the third scan line, and the fourth scan line.

7. The pixel circuit according to claim 1, characterized in that: The drain of the driving transistor is a first terminal of the driving transistor.

8. The pixel circuit according to claim 3, characterized in that: The potential regulating module is used to increase the potential of the first end of the driving transistor after the compensation module is turned off and during the period when the first light emitting control module is turned off.

9. A display panel, characterized in that: The pixel circuit comprises the pixel circuit described in any one of claims 1 to 8.

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