Pixel circuit, driving method thereof and display panel

Abstract

The invention discloses a pixel circuit, a driving method thereof and a display panel. The pixel circuit comprises a driving module, a threshold compensation module, a storage module, a light-emitting control module and a light-emitting module, the light-emitting module, the driving module and the light-emitting control module are sequentially connected in series between the first power supply and the second power supply; the storage module is connected with the first end of the driving module; the threshold compensation module is connected between the first power supply and the second end of the driving module, and the threshold compensation module is used for charging the storage module based on the first power supply in a compensation stage so as to transmit the threshold voltage of the driving module to the first end of the driving module. According to the technical scheme, the display performance of the display panel is improved.

Description

Technical Field

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

[0002] With the rapid development of display technology, the application of display products using organic light emitting devices (OLED) is becoming more and more widespread.

[0003] However, the display performance of current OLED display panels needs to be improved. Summary of the invention

[0004] The present invention provides a pixel circuit and a driving method thereof, and a display panel, so as to improve the display performance of the display panel.

[0005] According to one aspect of the present invention, a pixel circuit is provided, the pixel circuit comprising: a driving module, a threshold compensation module, a storage module, a light emitting control module and a light emitting module;

[0006] The light emitting module, the driving module and the light emitting control module are sequentially connected in series between the first power source and the second power source;

[0007] The storage module is connected to the first end of the driving module; the threshold compensation module is connected between the first power supply and the second end of the driving module, and the threshold compensation module is used to charge the storage module based on the first power supply during the compensation stage to transmit the threshold voltage of the driving module to the first end of the driving module.

[0008] Optionally, the pixel circuit further includes a writing module;

[0009] The writing module is connected to the control end of the driving module, and the writing module is used to control the driving module to be turned on during the compensation phase;

[0010] Preferably, the writing module is used to transmit a reset voltage to the control end of the driving module in the reset stage and the compensation stage; the reset voltage is greater than the sum of the second power supply voltage provided by the second power supply and the threshold voltage;

[0011] Preferably, the light emitting control module is used to transmit the second power supply voltage provided by the second power supply to the first end of the driving module during the reset stage;

[0012] Preferably, the reset phase is before the compensation phase.

[0013] Optionally, the first end of the writing module and the storage module is connected to a first node, the second end of the storage module is connected to the first end of the driving module, and the writing module is used to transmit the data voltage to the first node in a reset phase; the writing module is also used to transmit the data voltage from the first node to the control end of the driving module in a data writing phase;

[0014] Preferably, the data writing phase is after the compensation phase.

[0015] Optionally, the writing module includes a reset transistor;

[0016] The first electrode of the reset transistor is connected to the reset signal line, the second electrode of the reset transistor is connected to the control end of the driving module, and the control electrode of the reset transistor is connected to the first scanning line.

[0017] Optionally, the writing module further includes a data writing transistor and a transmission transistor;

[0018] A first electrode of the data writing transistor is connected to the data line, a second electrode of the data writing transistor is connected to the first node, and a control electrode of the data writing transistor is connected to the second scanning line;

[0019] The transmission transistor is connected between the first node and the control terminal of the driving module, and the control electrode of the transmission transistor is connected to the first light-emitting control line;

[0020] Preferably, the first scan line is multiplexed as the second scan line.

[0021] Optionally, the control end of the threshold compensation module is connected to a third scan line, and the first scan line is multiplexed as the third scan line;

[0022] Preferably, the control end of the light-emitting control module is connected to a second light-emitting control line, a second light-emitting control signal on the second light-emitting control line has the same waveform as a first light-emitting control signal on the first light-emitting control signal line, and in one frame, a starting time of an invalid level of the second light-emitting control signal is delayed by one line time relative to a starting time of an invalid level of the first light-emitting control signal;

[0023] Preferably, the first light-emitting control signal and the second light-emitting control signal are generated by the same group of gate driving circuits, the first light-emitting control signal of the pixel circuits in the mth row is provided by the gate driving circuit in the m-1th row, and the second light-emitting control signal is provided by the gate driving circuit in the mth row;

[0024] or,

[0025] The first light emitting control signal of the pixel circuits in the mth row is provided by the gate driving circuit in the mth row, and the second light emitting control signal is provided by the gate driving circuit in the (m+1)th row.

[0026] Optionally, the driving module includes a driving transistor, the light emitting module includes a light emitting diode; the pixel circuit further includes a writing module;

[0027] A first electrode of the light emitting diode is connected to the first power supply, and a second electrode of the light emitting diode is connected to a second electrode of the driving transistor;

[0028] The control electrode of the driving transistor is connected to the writing module, and the first electrode of the driving transistor is connected to the light emitting control module;

[0029] Preferably, the threshold compensation module comprises a threshold compensation transistor, a control electrode of the threshold compensation transistor is connected to the third scan line, a first electrode of the threshold compensation transistor is connected to the first power supply, and a second electrode of the threshold compensation transistor is connected to the second electrode of the driving transistor;

[0030] Preferably, the light emitting control module comprises a light emitting control transistor, a control electrode of the light emitting control transistor is connected to the second light emitting control line, a first electrode of the light emitting control transistor is connected to the first end of the driving module, and a second electrode of the light emitting control transistor is connected to the second power supply;

[0031] Preferably, the storage module comprises a storage capacitor, a first electrode of the storage capacitor is connected to the writing module, and a second electrode of the storage capacitor is connected to a first end of the driving module;

[0032] Preferably, the driving transistor is an N-type transistor.

[0033] According to another aspect of the present invention, a driving method of a pixel circuit is provided, wherein the pixel circuit comprises a driving module, a threshold compensation module, a storage module, a light emitting control module and a light emitting module; the light emitting module, the driving module and the light emitting control module are sequentially connected in series between a first power supply and a second power supply; the storage module is connected to a first end of the driving module; the threshold compensation module is connected between the first power supply and a second end of the driving module; the driving method of the pixel circuit comprises:

[0034] In the compensation stage, the threshold compensation module charges the storage module based on the first power source to transmit the threshold voltage of the driving module to the first end of the driving module.

[0035] Optionally, the pixel circuit further includes a writing module; the writing module is connected to the control end of the driving module;

[0036] Before the compensation stage, the driving method of the pixel circuit further includes:

[0037] In the reset phase, the writing module transmits the reset voltage to the control terminal of the driving module;

[0038] Preferably, the reset voltage is greater than the sum of the second power supply voltage provided by the second power supply and the threshold voltage;

[0039] Preferably, the first end of the writing module and the storage module are connected to a first node, and the second end of the storage module is connected to the first end of the driving module;

[0040] The driving method of the pixel circuit further includes:

[0041] In the reset phase, the writing module transmits the data voltage to the first node, and the light emitting control module transmits the second power supply voltage provided by the second power supply to the first end of the driving module;

[0042] After the compensation stage, the driving method of the pixel circuit further includes:

[0043] In the data writing stage, the writing module transmits the data voltage from the first node to the control end of the driving module;

[0044] In the light emitting stage, the driving module generates a driving current according to the data voltage, and the light emitting module emits light in response to the driving current.

[0045] According to another aspect of the present invention, a display panel is provided. The display panel includes the pixel circuit described in any embodiment of the present invention.

[0046] According to the technical solution of the embodiment of the present invention, the threshold compensation module charges the storage module based on the first power supply during the compensation stage. The first power supply voltage provided by the first power supply is relatively large. Regardless of whether the threshold voltage of the driving module is a positive voltage or a negative voltage, the first power supply can charge the storage module through the threshold compensation module and the driving module, so that the voltage at the first end of the driving module is a voltage related to the threshold voltage of the driving module, and then the threshold voltage of the driving module is transmitted to the first end of the driving module. Therefore, when the threshold voltages of different driving modules in the same display panel are different, the driving modules can be threshold compensated, thereby improving the uniformity of the threshold compensation effect. Under the same gray scale, the driving currents generated by different driving modules are consistent, and the luminous brightness of different light-emitting modules is consistent, thereby improving the display performance of the display panel.

[0047] 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

[0048] 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.

[0049] Figure 1 is a structural schematic diagram of a pixel circuit provided by an embodiment of the present invention;

[0050] Figure 2 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0051] Figure 3 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0052] Figure 4 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0053] Figure 5 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0054] Figure 6 is a timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0055] Figure 7 is a timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0056] Figure 8 is a flow chart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0057] Fig. 9 is a flow chart of another method for driving a pixel circuit provided by an embodiment of the present invention;

[0058] Fig.10 It is a structural schematic diagram of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] 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.

[0060] 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.

[0061] As mentioned in the background technology, the existing display panel has the problem that the display performance needs to be improved. The inventor has found that the reason for this problem is that the active organic light-emitting diode display panel needs to be driven by current to emit light. The display panel includes a pixel circuit and an organic light-emitting diode. The pixel circuit includes a thin film transistor. The thin film transistor may include a switching transistor and a driving transistor. The switching transistor can control whether to write a data voltage to the driving transistor, control whether the driving current generated by the driving transistor is transmitted to the light-emitting diode, etc., thereby controlling the working timing of the pixel circuit. The driving transistor can generate a driving current according to the data voltage, so that the organic light-emitting diode emits light in response to the driving current. However, the characteristics of the thin film transistors in different pixel circuits may be different, especially when the characteristics of the driving transistors are different, such as when the threshold voltages of different driving transistors are different, the driving currents generated by different pixel circuits under the same gray scale will be different, so that the light emitting brightness of different light-emitting diodes under the same gray scale is different, resulting in uneven picture quality, affecting the display effect of the display panel, and making the display performance of the display panel poor.

[0062] In view of the above technical problem, an embodiment of the present invention provides a pixel circuit. Figure 1 is a schematic diagram of a pixel circuit provided by an embodiment of the present invention, with reference to Figure 1 , the pixel circuit includes: a driving module 110, a threshold compensation module 120, a storage module 130, a light emitting control module 140 and a light emitting module 150;

[0063] The light emitting module 150, the driving module 110 and the light emitting control module 140 are sequentially connected in series between the first power source VDD and the second power source VSS;

[0064] The storage module 130 is connected to the first end s of the driving module 110; the threshold compensation module 120 is connected between the first power supply VDD and the second end d of the driving module 110, and the threshold compensation module 120 is used to charge the storage module 130 based on the first power supply VDD during the compensation stage to transmit the threshold voltage of the driving module 110 to the first end s of the driving module 110.

[0065] Among them, the light-emitting module 150 may include an organic light-emitting diode. For example, the first power supply voltage provided by the first power supply VDD is a positive voltage, and the second power supply voltage provided by the second power supply VSS is a zero or negative voltage; or, the first power supply voltage provided by the first power supply VDD is a zero or negative voltage, and the second power supply voltage provided by the second power supply VSS is a positive voltage, which is not limited in this embodiment. The driving module 110 can generate a driving current, and the light-emitting module 150 can emit light in response to the driving current. The light-emitting control module 140 can control whether the driving current generated by the driving module 110 is transmitted to the light-emitting module 150. When the light-emitting control module 140 is turned on, the first power supply VDD, the light-emitting module 150, the driving module 110, the light-emitting control module 140 and the second power supply VSS can form a current path, so that the driving module 110 generates a driving current, thereby making the light-emitting module 150 emit light. Exemplarily, the light-emitting module 150, the driving module 110 and the light-emitting control module 140 are connected in series between the first power supply VDD and the second power supply VSS.

[0066] Specifically, for example, the first power supply voltage provided by the first power supply VDD is a positive voltage. By setting the storage module 130 to be connected to the first terminal s of the driving module 110, and the threshold compensation module 120 to be connected between the first power supply VDD and the second terminal d of the driving module 110, in the compensation stage, when the driving module 110 and the threshold compensation module 120 are turned on, the first power supply VDD charges the storage module 130 through the driving module 110 and the threshold compensation module 120. The voltage of the first terminal s of the driving module 110 increases until the voltage of the first terminal s of the driving module 110 reaches the difference between the control terminal of the driving module 110 and the threshold voltage of the driving module 110, and the driving module 110 is turned off, so that the voltage related to the threshold voltage of the driving module 110 is transmitted to the first terminal s of the driving module 110, thereby realizing the threshold compensation of the driving module 110.

[0067] Furthermore, the first power supply voltage provided by the first power supply VDD is relatively large. Regardless of whether the threshold voltage of the driving module 110 is a positive voltage or a negative voltage, the first power supply VDD can charge the storage module 130 through the threshold compensation module 120 and the driving module 110, so that the voltage of the first terminal s of the driving module 110 is a voltage related to the threshold voltage of the driving module 110, and then the threshold voltage of the driving module 110 is transmitted to the first terminal s of the driving module 110. In this way, regardless of whether the threshold voltage of the driving module 110 is a positive voltage or a negative voltage, the threshold compensation of the driving module 110 can be achieved. When the threshold voltages of different driving modules 110 in the same display panel are different due to the process or the length of use of the driving module 110, the threshold compensation can be performed on the driving module 110, thereby improving the uniformity of the threshold compensation effect. This ensures that at the same grayscale, the driving currents generated by different driving modules 110 are consistent, and the luminous brightness of different light-emitting modules 150 is consistent, which is beneficial to improving the display uniformity of the display panel formed by the pixel circuit, thereby improving the display quality of the display panel, that is, improving the display effect of the display panel and improving the display performance of the display panel.

[0068] In the technical solution of this embodiment, the threshold compensation module charges the storage module based on the first power supply during the compensation stage. The first power supply voltage provided by the first power supply is relatively large. Regardless of whether the threshold voltage of the driving module is a positive voltage or a negative voltage, the first power supply can charge the storage module through the threshold compensation module and the driving module, so that the voltage at the first end of the driving module is a voltage related to the threshold voltage of the driving module, and then the threshold voltage of the driving module is transmitted to the first end of the driving module. Therefore, when the threshold voltages of different driving modules in the same display panel are different, the driving modules can be threshold compensated, thereby improving the uniformity of the threshold compensation effect. Under the same gray scale, the driving currents generated by different driving modules are consistent, and the luminous brightness of different light-emitting modules is consistent, thereby improving the display performance of the display panel.

[0069] On the basis of the above technical solutions, the structure that the pixel circuit may also include is described below, but it is not intended to limit the present application.

[0070] Figure 2 is a schematic diagram of a structure of another pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 2 , the pixel circuit further includes a writing module 160;

[0071] The writing module 160 is connected to the control terminal g of the driving module 110 , and the writing module 160 is used to control the driving module 110 to be turned on during the compensation phase.

[0072] Specifically, the writing module 160 may write a voltage to the control terminal g of the driving module 110, for example, before the compensation phase, write a voltage to the control terminal g of the driving module 110 to turn on the driving module 110, and continue to write a voltage to the control terminal g of the driving module 110 during the compensation phase to maintain the driving module 110 being turned on. In this way, during the compensation phase, the first power source VDD may charge the storage module 130 through the threshold compensation module 120 and the driving module 110, so that the voltage of the first terminal s of the driving module 110 is a voltage related to the threshold voltage of the driving module 110, so as to facilitate the threshold compensation of the driving module 110.

[0073] Optionally, the writing module 160 is used to transmit the reset voltage Vint to the control terminal g of the driving module 110 in the reset stage and the compensation stage; the reset voltage Vint is greater than the sum of the second power supply voltage Vss provided by the second power supply VSS and the threshold voltage Vth.

[0074] Specifically, in the reset stage, the writing module 160 transmits the reset voltage Vint to the control terminal g of the driving module 110, and the potential of the control terminal g of the driving module 110 is Vg=Vint, so as to facilitate resetting the control terminal g of the driving module 110. The potential of the first terminal s of the driving module 110 is Vs=Vss, and the reset voltage Vint is greater than the sum of the second power supply voltage Vss provided by the second power supply VSS and the threshold voltage Vth, so that the voltage Vg of the control terminal g of the driving module 110 is greater than the sum of the voltage Vs of the first terminal s of the driving module 110 and the threshold voltage Vth of the driving module 110, that is, Vg-Vs>Vth, so that the driving module 110 is turned on, so that the first power supply VDD can charge the storage module 130 through the threshold compensation module 120 and the driving module 110.

[0075] Furthermore, in the compensation phase, the writing module 160 transmits the reset voltage Vint to the control terminal g of the driving module 110, and maintains the potential of the control terminal g of the driving module 110 as Vg=Vint, so that after the first power source VDD charges the storage module 130, the potential of the first terminal s of the driving module 110 changes until the potential of the first terminal s of the driving module 110 is Vint-Vth, and the driving module 110 is turned off. In this way, the voltage of the first terminal s of the driving module 110 is a voltage related to the threshold voltage of the driving module 110, so that the threshold voltage of the driving module 110 is transmitted to the first terminal s of the driving module 110, and the threshold compensation of the driving module 110 is achieved.

[0076] Optionally, the light control module 140 is used to transmit the second power supply voltage Vss provided by the second power supply VSS to the first terminal s of the driving module 110 during the reset phase. In this way, during the reset phase, the potential of the first terminal s of the driving module 110 is Vs=Vss, which facilitates controlling the driving module 110 to turn on.

[0077] Optionally, the reset phase is before the compensation phase. In this way, in the reset phase before the compensation phase, the driving module 110 is controlled to be turned on, so that in the compensation phase, the first power supply VDD can charge the storage module 130 through the threshold compensation module 120 and the driving module 110, so that the voltage of the first terminal s of the driving module 110 is a voltage related to the threshold voltage of the driving module 110, thereby achieving threshold compensation for the driving module 110.

[0078] Optionally, refer to Figure 2 The first end of the writing module 160 and the storage module 130 are connected to the first node n, the second end of the storage module 130 is connected to the first end s of the driving module 110, and the writing module 160 is used to transmit the data voltage Vdata to the first node n in the reset phase; the writing module 160 is also used to transmit the data voltage Vdata from the first node n to the control end g of the driving module 110 in the data writing phase.

[0079] Specifically, in the reset phase, the write module 160 transmits the data voltage Vdata to the first node n, and the potential of the first node n is Vn=Vdata, so that the storage module 130 can store a voltage related to the data voltage. In the compensation phase, the write module 160 transmits the data voltage Vdata to the first node n, and maintains the potential of the first node n as Vn=Vdata, so that when the storage module 130 is discharged, the voltage of the second end of the storage module 130 changes, that is, the voltage of the first end s of the driving module 110 changes, so that the voltage of the first end s of the driving module 110 becomes a voltage related to the threshold voltage of the driving module 110. In the data writing phase, the write module 160 can transmit the data voltage Vdata from the first node n to the control end g of the driving module 110, so that the driving module 110 can generate a driving current according to the data voltage Vdata.

[0080] Optionally, the data writing phase is after the compensation phase.

[0081] Specifically, in the compensation stage, the writing module 160 transmits the data voltage Vdata to the first node n, maintaining the potential of the first node n at Vn=Vdata, so that the potential of the first node n remains unchanged, which facilitates the transmission of the data voltage Vdata of the first node n to the control terminal g of the driving module 110 during the data writing stage.

[0082] Based on the above technical solution, the possible structure of the writing module 160 is described below, but it is not intended to limit the present application.

[0083] Figure 3 is a schematic diagram of a structure of another pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 3 , the writing module 160 includes a reset transistor T1;

[0084] A first electrode of the reset transistor T1 is connected to the reset signal line Vini, a second electrode of the reset transistor T1 is connected to the control terminal g of the driving module 110, and a control electrode of the reset transistor Vini is connected to the first scanning line S1.

[0085] Specifically, in the reset stage, the scan signal on the first scan line S1 controls the reset transistor T1 to turn on, and the reset transistor T1 transmits the reset voltage Vint on the reset signal line Vini to the control terminal g of the driving module 110. The potential of the control terminal g of the driving module 110 is Vg=Vint, which is convenient for resetting the control terminal g of the driving module 110 and can turn on the driving module 110. In the compensation stage, the reset transistor T1 continues to transmit the reset voltage Vint to the control terminal g of the driving module 110, maintains the potential of the control terminal g of the driving module 110 as Vg=Vint, and the driving module 110 is turned on, so that the first power supply VDD can charge the storage module 130 through the threshold compensation module 120 and the driving module 110. And after the first power supply VDD charges the storage module 130, the potential of the control terminal g of the driving module 110 remains unchanged, and the potential of the first terminal s of the driving module 110 changes until the potential of the first terminal s of the driving module 110 is Vint-Vth, thereby achieving threshold compensation for the driving module 110.

[0086] Optionally, refer to Figure 3 , the writing module 160 also includes a data writing transistor T2 and a transmission transistor T3;

[0087] A first electrode of the data writing transistor T2 is connected to the data line Data, a second electrode of the data writing transistor T2 is connected to the first node n, and a control electrode of the data writing transistor T2 is connected to the second scanning line S2;

[0088] The transmission transistor T3 is connected between the first node n and the control terminal g of the driving module 110 , and the control electrode of the transmission transistor T3 is connected to the first light emitting control line EM1 .

[0089] Specifically, in the reset phase, the scan signal on the second scan line S2 controls the data writing transistor T2 to turn on, and the data writing transistor T2 transmits the data voltage Vdata to the first node n, and the potential of the first node n is Vn=Vdata, so that the storage module 130 can store a voltage related to the data voltage. In the compensation phase, the data writing transistor T2 continues to transmit the data voltage Vdata to the first node n, and maintains the potential of the first node n as Vn=Vdata, so that when the storage module 130 is discharged, the voltage of the second end of the storage module 130 changes, that is, the voltage of the first end s of the driving module 110 changes, so that the voltage of the first end s of the driving module 110 becomes a voltage related to the threshold voltage of the driving module 110, that is, Vs=Vint-Vth. The voltage difference stored in the storage module 130 is Vdata-(Vint-Vth).

[0090] In the data writing stage, the first light emitting control signal on the first light emitting control line EM1 controls the transmission transistor T3 to be turned on, and the transmission transistor T3 can transmit the data voltage Vdata from the first node n to the control terminal g of the driving module 110, so that the driving module 110 can generate a driving current according to the data voltage Vdata. Due to the coupling effect of the storage module 130, when the voltage of the control terminal g of the driving module 110 changes, the voltage of the second terminal of the storage module 130 also changes, that is, the voltage of the first terminal s of the driving module 110 also changes accordingly, but the voltage stored in the storage module 130 remains unchanged, and is still Vdata-(Vint-Vth).

[0091] In the light-emitting stage, after the light-emitting control module 140 is turned on, the voltage at the second end of the storage module 130 becomes the second power supply voltage Vss, and the voltage difference of the storage module 130 is Vdata-(Vint-Vth), then the voltage at the first end of the storage module 130 is Vss+Vdata-Vint+Vth, that is, the voltage at the control end g of the driving module 110 is Vg=Vss+Vdata-Vint+Vth, and the driving current generated by the driving module 110 is The voltage difference between the control terminal g of the driving module 110 and the first terminal s of the driving module 110 is Vgs=Vss+Vdata-Vint+Vth-Vss=Vdata-Vint+Vth, so the driving current is Wherein, μ is the electron mobility of the driving transistor in the driving module 110, Cox is the channel capacitance per unit area of ​​the driving transistor in the driving module 110, W is the channel width of the driving transistor in the driving module 110, L is the channel length of the driving transistor in the driving module 110, and Vth is the threshold voltage of the driving transistor in the driving module 110.

[0092] In this way, the driving current generated by the driving module 110 is independent of the threshold voltage Vth of the driving module 110 and the first power supply VDD and the second power supply VSS. Therefore, the problem of driving current fluctuation caused by the threshold voltage offset of the driving module 110 can be avoided, and the driving current fluctuation caused by the voltage drop of the first power supply VDD and the second power supply VSS can be avoided, so that the stability of the driving current can be ensured, and then the light-emitting module 150 can stably emit light, which can improve the display effect of the display panel formed by the pixel circuit.

[0093] Furthermore, when the transmission transistor T3 is turned on, the storage module 130 can store the voltage difference Vgs between the control end g of the driving module 110 and the first end s of the driving module 110, thereby maintaining the driving module 110 to generate a driving current, so that the driving module 110 can stably generate a driving current, so that the light-emitting module 150 can stably emit light, thereby improving the display effect of the display panel.

[0094] Moreover, by setting the transmission transistor T3, the data voltage will be transmitted to the control terminal g of the driving module 110 only when the transmission transistor T3 is turned on, thereby separating the compensation phase from the data writing phase, so that the duration of the compensation phase is not limited by the data writing duration, and the compensation time can be adjusted according to demand, so that a larger range of threshold voltage fluctuations can be compensated, and more sufficient compensation can be achieved to achieve a better compensation effect.

[0095] Optionally, refer to Figure 3 , the first scan line S1 is multiplexed into the second scan line S2.

[0096] Specifically, the display panel formed by the pixel circuit includes a gate driving circuit, which can generate a gate driving signal (a scanning signal or a light emitting control signal).

[0097] By setting the first scan line S1 to be multiplexed as the second scan line S2, so that the scan signals on the first scan line S1 and the second scan line S2 are the same, the number of scan signals can be reduced, and then the number of gate drive circuits can be reduced, so that the size of the non-display area or the frame area of ​​the display panel formed by the pixel circuit can be reduced, which is convenient for realizing a narrow frame. In addition, the first scan line S1 is multiplexed as the second scan line S2, which can reduce the number of scan lines and facilitate the realization of a higher pixel density.

[0098] It should be noted that Figure 3 The reset transistor T1, the data writing transistor T2 and the transmission transistor T3 are all N-type transistors, but this is not a limitation. In some other embodiments, the reset transistor T1, the data writing transistor T2 and the transmission transistor T3 may all be P-type transistors; or some may be N-type transistors and the other may be P-type transistors.

[0099] Optionally, refer to Figure 3 , the control end of the threshold compensation module 120 is connected to the third scan line S3, and the first scan line S1 is multiplexed as the third scan line S3. In this way, the scan signals on the first scan line S1, the second scan line S2 and the third scan line S3 are the same, which can further reduce the number of scan signals, thereby reducing the number of gate drive circuits, and facilitating the display panel to achieve a narrow frame.

[0100] Optionally, refer to Figure 3 , the control end of the light control module 140 is connected to the second light control line EM2, the second light control signal on the second light control line EM2 has the same waveform as the first light control signal on the first light control signal line EM1, and in one frame, the start time of the invalid level of the second light control signal is delayed by one line time relative to the start time of the invalid level of the first light control signal. In this way, the first light control signal and the second light control signal can be provided by gate drive circuits of different levels in the same group of gate drive circuits, which can reduce the number of gate drive circuits and facilitate the display panel to achieve a narrow frame.

[0101] In one embodiment, the first light-emitting control signal and the second light-emitting control signal are generated by the same group of gate driving circuits, the first light-emitting control signal of the pixel circuit in the mth row is provided by the gate driving circuit in the m-1th row, and the second light-emitting control signal is provided by the gate driving circuit in the mth row. A group of gate driving circuits includes a plurality of gate driving circuits connected in cascade.

[0102] That is to say, the m-1th level gate driving circuit outputs the first light-emitting control signal corresponding to the mth row pixel circuit; the mth level gate driving circuit outputs the first light-emitting control signal corresponding to the m+1th row pixel circuit, which is also the second light-emitting control signal corresponding to the mth row pixel circuit, so that the first light-emitting control line EM1 and the second light-emitting control line EM2 can be connected to the same group of gate driving circuits.

[0103] In another implementation, the first light emitting control signal of the pixel circuit in the mth row is provided by the gate driving circuit in the mth row, and the second light emitting control signal is provided by the gate driving circuit in the (m+1)th row.

[0104] That is, the m-th level gate driving circuit outputs the first light control signal corresponding to the m-th row pixel circuit; the m+1-th level gate driving circuit outputs the first light control signal corresponding to the m+1-th row pixel circuit, which is also the second light control signal corresponding to the m-th row pixel circuit, so that the first light control line EM1 and the second light control line EM2 can be connected to the same set of gate driving circuits, thereby reducing the number of gate driving circuits, which is conducive to reducing the frame size. Wherein, m is an integer greater than 1.

[0105] In this way, the pixel circuit provided by the embodiment of the present invention may only require two groups of gate driving circuits (one group of gate driving circuits provides light-emitting control signals, and the other group of gate driving circuits provides scanning signals), which is beneficial for reducing the frame size.

[0106] Among them, one line time can be calculated according to the resolution and refresh rate of the display panel. According to the resolution, the number of rows of pixel circuits (that is, the number of rows of light-emitting elements) can be determined. Then, one line time is

[0108] The following describes possible structures of various modules in the pixel circuit, but does not limit the present application.

[0109] Figure 4 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention, Figure 5 is a schematic diagram of a structure of another pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 4 or Figure 5 , the driving module 110 includes a driving transistor T4, the light emitting module 150 includes a light emitting diode D1; the pixel circuit also includes a writing module 160;

[0110] A first electrode of the light emitting diode D1 is connected to a first power source VDD, and a second electrode of the light emitting diode D1 is connected to a second electrode of the driving transistor T4;

[0111] The control electrode of the driving transistor T4 is connected to the writing module 160 , and the first electrode of the driving transistor T4 is connected to the light emitting control module 140 .

[0112] The control electrode of the driving transistor T4 is the control terminal g of the driving module 110, the first electrode of the driving transistor T4 is the first terminal s of the driving module 110, and the second electrode of the driving transistor T4 is the second terminal d of the driving module 110. The first electrode s of the driving transistor T4 is the source electrode, and the second electrode d of the driving transistor T4 is the drain electrode. The light emitting diode D1 is an organic light emitting diode, the first electrode of the light emitting diode D1 is the first terminal of the light emitting module 150, and the second electrode of the light emitting diode D1 is the second terminal of the light emitting module 150. The first electrode of the light emitting diode D1 is the anode, and the second electrode of the light emitting diode D1 is the cathode; or the first electrode of the light emitting diode D1 is the cathode, and the second electrode of the light emitting diode D1 is the anode.

[0113] Specifically, in the reset stage, the reset transistor T1 in the write module 160 transmits the reset voltage Vint to the control electrode g of the reset transistor T1, and the potential of the control electrode g of the reset transistor T1 is Vg=Vint, which is convenient for resetting the control electrode g of the reset transistor T1 and can turn on the reset transistor T1. Therefore, in the compensation stage, the first power supply VDD can charge the storage module 130 through the threshold compensation module 120 and the driving transistor T4, so that the voltage of the first electrode s of the driving transistor T4 reaches Vint-Vth, thereby realizing the threshold compensation of the driving transistor T4. Among them, Vth is the threshold voltage of the driving transistor T4.

[0114] Optionally, refer to Figure 4 or Figure 5 The threshold compensation module 120 includes a threshold compensation transistor T5, a control electrode of the threshold compensation transistor T5 is connected to the third scan line S3, a first electrode of the threshold compensation transistor T5 is connected to the first power supply VDD, and a second electrode of the threshold compensation transistor T5 is connected to the second electrode of the driving transistor T4.

[0115] Specifically, in the compensation stage, the threshold compensation transistor T5 is turned on, and the first power supply VDD charges the storage module 130 through the threshold compensation transistor T5 and the driving transistor T4, so that the voltage of the first electrode s of the driving transistor T4 is a voltage related to the threshold voltage of the driving transistor T4, thereby realizing threshold compensation for the driving transistor T4.

[0116] Figure 4 FIG. 4 shows a case where the threshold compensation transistor T5 is an N-type transistor. Figure 5 2 shows the case where the threshold compensation transistor T5 is a P-type transistor. This embodiment does not limit the type of the threshold compensation transistor T5.

[0117] Optionally, refer to Figure 4 or Figure 5 The light control module 140 includes a light control transistor T6, a control electrode of the light control transistor T6 is connected to the second light control line EM2, a first electrode of the light control transistor T6 is connected to the first end s of the driving module 110, and a second electrode of the light control transistor T6 is connected to the second power supply VSS.

[0118] Specifically, in the reset stage, the second light-emitting control signal on the second light-emitting control line EM2 controls the light-emitting control transistor T6 to be turned on, so that the potential of the first terminal s of the driving module 110 is Vs=Vss. The potential of the control terminal g of the driving module 110 is Vg=Vint, and the reset voltage Vint is greater than the sum of the second power supply voltage Vss provided by the second power supply VSS and the threshold voltage Vth. Then, the voltage Vg of the control terminal g of the driving module 110 is greater than the sum of the voltage Vs of the first terminal s of the driving module 110 and the threshold voltage Vth of the driving module 110, that is, Vg-Vs>Vth, so that the driving module 110 is turned on, so that the first power supply VDD can charge the storage module 130 through the threshold compensation module 120 and the driving module 110.

[0119] In the light-emitting stage, the second light-emitting control signal on the second light-emitting control line EM2 controls the light-emitting control transistor T6 to turn on, so that the first power supply VDD, the light-emitting module 150, the driving module 110, the light-emitting control module 140 and the second power supply VSS can form a current path, so that the driving module 110 generates a driving current, thereby making the light-emitting module 150 emit light.

[0120] Figure 4 FIG. 4 shows a case where the light emission control transistor T6 is an N-type transistor. Figure 5 The case where the light emission control transistor T6 is a P-type transistor is shown in FIG. 1 , and the type of the light emission control transistor T6 is not limited in this embodiment.

[0121] Optionally, refer to Figure 4 or Figure 5 The storage module 130 includes a storage capacitor C1 , a first electrode of the storage capacitor C1 is connected to the writing module 160 , and a second electrode of the storage capacitor C1 is connected to the first end s of the driving module 110 .

[0122] Specifically, in the compensation stage, the first power supply VDD charges the storage capacitor C1 through the threshold compensation transistor T5 and the driving transistor T4, and the potential of the first electrode of the storage capacitor C1 remains unchanged and is maintained as the data voltage Vdata. The voltage of the second electrode of the storage capacitor C1 gradually changes during the charging process until the voltage of the second electrode of the storage capacitor C1 reaches Vint-Vth, thereby achieving threshold compensation for the driving transistor T4.

[0123] Furthermore, the storage capacitor C1 can store the voltage difference Vgs between the control electrode g of the driving transistor T4 and the first electrode s of the driving transistor T4, so as to maintain the driving current generated by the driving transistor T4, so that the driving transistor T4 can stably generate the driving current, thereby improving the light emitting stability of the light emitting module 150.

[0124] Furthermore, the pixel circuit provided in this embodiment includes only one storage capacitor C1, so that the number of components in the pixel circuit is relatively small, and the space occupied by the pixel circuit can be reduced, thereby improving the pixel density of the display panel formed by the pixel circuit.

[0125] Optionally, refer to Figure 4 or Figure 5 , the driving transistor T4 is an N-type transistor. In this way, the first electrode s of the driving transistor T4 is the source electrode, so that during the compensation process, the voltage of the first electrode s of the driving transistor T4 can reach the difference between the voltage of the control electrode g of the driving transistor T4 and the threshold voltage Vth of the driving transistor T4, that is, Vint-Vth, to achieve threshold compensation for the driving transistor T4. In addition, the storage capacitor C1 can store the voltage difference between the control electrode g of the driving transistor T4 and the source electrode of the driving transistor T4, that is, store the gate-source voltage difference, thereby maintaining the driving current generated by the driving transistor T4.

[0126] Figure 4 FIG. 4 shows a case where all transistors are N-type transistors. Using N-type transistors can reduce the leakage current of the driving transistor T4. Figure 5 The figure shows the case where all transistors except the driving transistor T4 are P-type transistors. The use of P-type transistors can reduce power consumption and reduce the occupied area of ​​the pixel circuit, which is convenient for the display panel to achieve a higher pixel density. In some other implementations, some transistors in the pixel circuit can be N-type transistors and the other part can be P-type transistors, which is not limited in this embodiment.

[0127] The working process of the pixel circuit is described below in conjunction with the driving timing of the pixel circuit, but this is not intended to limit the present application.

[0128] The first scan line S1 , the second scan line S2 , and the third scan line S3 are connected, and the scan signals Scan transmitted by the first scan line S1 , the second scan line S2 , and the third scan line S3 are the same.

[0129] In one embodiment, Figure 6 is a timing diagram of a pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 4 and Figure 6 ,The working process of the pixel circuit includes the following stages.

[0130] In the reset phase t1, the scan signal Scan is at a high level, the reset transistor T1, the data writing transistor T2 and the threshold compensation transistor T5 are turned on, the first light control signal Em1 on the first light control line EM1 is at a low level, the transmission transistor T3 is not turned on, the second light control signal Em2 on the second light control line EM2 is at a high level, and the light control transistor T6 is turned on. The reset transistor T1 transmits the reset voltage Vint to the control electrode g of the driving transistor T4, and the potential of the control electrode g of the driving transistor T4 is Vg=Vint, which is convenient for resetting the control electrode g of the driving transistor T4. And the light control transistor T6 is turned on, the voltage of the first electrode s of the driving transistor T4 is the second power supply voltage Vss, and the reset voltage Vint is greater than the sum of the second power supply voltage Vss provided by the second power supply VSS and the threshold voltage Vth, then the voltage Vg of the control terminal g of the driving module 110 is greater than the sum of the voltage Vs of the first terminal s of the driving module 110 and the threshold voltage Vth of the driving module 110, that is, Vg-Vs>Vth, so that the driving transistor T4 is turned on. The data writing transistor T2 transmits the data voltage Vdata to the first node n, and the potential of the first node n is Vn=Vdata, so that the storage module 130 can store a voltage related to the data voltage.

[0131] In the compensation stage t2, the scan signal Scan is at a high level, the reset transistor T1, the data writing transistor T2 and the threshold compensation transistor T5 are turned on, the first light control signal Em1 on the first light control line EM1 and the second light control signal Em2 on the second light control line EM2 are at a low level, and the transmission transistor T3 and the light control transistor T6 are not turned on. The reset transistor T1 continues to transmit the reset voltage Vint to the control terminal g of the driving module 110, maintaining the potential of the control terminal g of the driving module 110 as Vg=Vint, and the driving module 110 is turned on. The first power supply VDD charges the storage capacitor C1 through the threshold compensation transistor T5 and the driving transistor T4, and the potential of the first electrode s of the driving transistor T4 changes until the potential of the first electrode s of the driving transistor T4 is Vint-Vth, thereby achieving threshold compensation for the driving transistor T4.

[0132] In the data writing stage t3, the scanning signal Scan is at a low level, the reset transistor T1, the data writing transistor T2 and the threshold compensation transistor T5 are not turned on, the first light-emitting control signal Em1 on the first light-emitting control line EM1 is at a high level, the transmission transistor T3 is turned on, the second light-emitting control signal Em2 on the second light-emitting control line EM2 is at a low level, and the light-emitting control transistor T6 is not turned on. The transmission transistor T3 can transmit the data voltage Vdata from the first node n to the control electrode g of the driving transistor T4, so that the driving transistor T4 can generate a driving current according to the data voltage Vdata. Because of the coupling effect of the storage capacitor C1, when the voltage of the control electrode g of the driving transistor T4 changes, the voltage of the second electrode of the storage capacitor C1 also changes, that is, the voltage of the first electrode s of the driving transistor T4 also changes accordingly, but the voltage stored in the storage capacitor C1 remains unchanged and is still Vdata-(Vint-Vth).

[0133] In the light-emitting stage, the scanning signal Scan is at a low level, the reset transistor T1, the data writing transistor T2 and the threshold compensation transistor T5 are not turned on, the first light-emitting control signal Em1 on the first light-emitting control line EM1 and the second light-emitting control signal Em2 on the second light-emitting control line EM2 are at a high level, and the transmission transistor T3 and the light-emitting control transistor T6 are turned on. The voltage of the second electrode of the storage capacitor C1 becomes the second power supply voltage Vss, and the voltage difference of the storage capacitor C1 is Vdata-(Vint-Vth), then the voltage of the first electrode of the storage capacitor C1 is Vss+Vdata-Vint+Vth, that is, the voltage of the control electrode g of the driving transistor T4 is Vg=Vss+Vdata-Vint+Vth, and the driving current generated by the driving transistor T4 is Among them, the voltage difference between the control electrode g of the driving transistor T4 and the first electrode s of the driving transistor T4 is Vgs=Vss+Vdata-Vint+Vth-Vss=Vdata-Vint+Vth, so the driving current is In this way, the driving current generated by the driving transistor T4 is independent of the threshold voltage Vth of the driving transistor T4 and the first power supply VDD and the second power supply VSS. Therefore, the problem of driving current fluctuation caused by the threshold voltage offset of the driving transistor T4 can be avoided, and the driving current fluctuation caused by the voltage drop of the first power supply VDD and the second power supply VSS can be avoided, so that the stability of the driving current can be ensured, and then the light-emitting module 150 can stably emit light, which can improve the display effect of the display panel formed by the pixel circuit.

[0134] In another embodiment, Figure 7 is a timing diagram of a pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 5 and Figure 7,The working process of the pixel circuit includes the following stages.

[0135] In the reset phase t1, the scan signal Scan is at a low level, the reset transistor T1, the data writing transistor T2 and the threshold compensation transistor T5 are turned on, the first light control signal Em1 on the first light control line EM1 is at a high level, the transmission transistor T3 is not turned on, the second light control signal Em2 on the second light control line EM2 is at a low level, and the light control transistor T6 is turned on. The reset transistor T1 transmits the reset voltage Vint to the control electrode g of the driving transistor T4, and the potential of the control electrode g of the driving transistor T4 is Vg=Vint, which is convenient for resetting the control electrode g of the driving transistor T4. And the light control transistor T6 is turned on, the voltage of the first electrode s of the driving transistor T4 is the second power supply voltage Vss, and the reset voltage Vint is greater than the sum of the second power supply voltage Vss provided by the second power supply VSS and the threshold voltage Vth, then the voltage Vg of the control terminal g of the driving module 110 is greater than the sum of the voltage Vs of the first terminal s of the driving module 110 and the threshold voltage Vth of the driving module 110, that is, Vg-Vs>Vth, so that the driving transistor T4 is turned on. The data writing transistor T2 transmits the data voltage Vdata to the first node n, and the potential of the first node n is Vn=Vdata, so that the storage module 130 can store a voltage related to the data voltage.

[0136] In the compensation stage t2, the scan signal Scan is at a low level, the reset transistor T1, the data writing transistor T2 and the threshold compensation transistor T5 are turned on, the first light control signal Em1 on the first light control line EM1 and the second light control signal Em2 on the second light control line EM2 are at a high level, and the transmission transistor T3 and the light control transistor T6 are not turned on. The reset transistor T1 continues to transmit the reset voltage Vint to the control terminal g of the driving module 110, maintaining the potential of the control terminal g of the driving module 110 as Vg=Vint, and the driving module 110 is turned on. The first power supply VDD charges the storage capacitor C1 through the threshold compensation transistor T5 and the driving transistor T4, and the potential of the first electrode s of the driving transistor T4 changes until the potential of the first electrode s of the driving transistor T4 is Vint-Vth, thereby achieving threshold compensation for the driving transistor T4.

[0137] In the data writing stage t3, the scanning signal Scan is at a high level, the reset transistor T1, the data writing transistor T2 and the threshold compensation transistor T5 are not turned on, the first light-emitting control signal Em1 on the first light-emitting control line EM1 is at a low level, the transmission transistor T3 is turned on, the second light-emitting control signal Em2 on the second light-emitting control line EM2 is at a high level, and the light-emitting control transistor T6 is not turned on. The transmission transistor T3 can transmit the data voltage Vdata from the first node n to the control electrode g of the driving transistor T4, so that the driving transistor T4 can generate a driving current according to the data voltage Vdata. Because of the coupling effect of the storage capacitor C1, when the voltage of the control electrode g of the driving transistor T4 changes, the voltage of the second electrode of the storage capacitor C1 also changes, that is, the voltage of the first electrode s of the driving transistor T4 also changes accordingly, but the voltage stored in the storage capacitor C1 remains unchanged and is still Vdata-(Vint-Vth).

[0138] In the light-emitting stage, the scanning signal Scan is at a high level, the reset transistor T1, the data writing transistor T2 and the threshold compensation transistor T5 are not turned on, the first light-emitting control signal Em1 on the first light-emitting control line EM1 and the second light-emitting control signal Em2 on the second light-emitting control line EM2 are at a low level, and the transmission transistor T3 and the light-emitting control transistor T6 are turned on. The voltage of the second electrode of the storage capacitor C1 becomes the second power supply voltage Vss, and the voltage difference of the storage capacitor C1 is Vdata-(Vint-Vth), then the voltage of the first electrode of the storage capacitor C1 is Vss+Vdata-Vint+Vth, that is, the voltage of the control electrode g of the driving transistor T4 is Vg=Vss+Vdata-Vint+Vth, and the driving current generated by the driving transistor T4 is Among them, the voltage difference between the control electrode g of the driving transistor T4 and the first electrode s of the driving transistor T4 is Vgs=Vss+Vdata-Vint+Vth-Vss=Vdata-Vint+Vth, so the driving current is In this way, the driving current generated by the driving transistor T4 is independent of the threshold voltage Vth of the driving transistor T4 and the first power supply VDD and the second power supply VSS. Therefore, the problem of driving current fluctuation caused by the threshold voltage offset of the driving transistor T4 can be avoided, and the driving current fluctuation caused by the voltage drop of the first power supply VDD and the second power supply VSS can be avoided, so that the stability of the driving current can be ensured, and then the light-emitting module 150 can stably emit light, which can improve the display effect of the display panel formed by the pixel circuit.

[0139] An embodiment of the present invention further provides a method for driving a pixel circuit. The driving method is used to drive the pixel circuit provided by any embodiment of the present invention. Figure 8 is a flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention, with reference to Figure 8 , the driving method of the pixel circuit includes:

[0140] S101 . In a compensation phase, a threshold compensation module charges a storage module based on a first power source to transmit a threshold voltage of a driving module to a first end of the driving module.

[0141] Specifically, for example, the first power supply voltage provided by the first power supply VDD is a positive voltage. In the compensation stage, when the driving module 110 and the threshold compensation module 120 are turned on, the first power supply VDD charges the storage module 130 through the driving module 110 and the threshold compensation module 120. The voltage of the first terminal s of the driving module 110 increases until the voltage of the first terminal s of the driving module 110 reaches the difference between the control terminal of the driving module 110 and the threshold voltage of the driving module 110, and the driving module 110 is turned off, so that the voltage related to the threshold voltage of the driving module 110 is transmitted to the first terminal s of the driving module 110, thereby realizing threshold compensation for the driving module 110.

[0142] S102, in the light-emitting stage, the driving module generates a driving current, and the light-emitting module emits light in response to the driving current.

[0143] Specifically, in the light-emitting stage, the driving module 110 generates a driving current. Since the threshold compensation is performed on the driving module 110 in the compensation stage, the driving current generated by the driving module 110 is independent of the threshold voltage of the driving module 110, thereby avoiding the driving current change caused by the threshold voltage offset, improving the stability of the light-emitting module 150, and improving the display performance of the display panel. In addition, the first power supply voltage provided by the first power supply VDD is relatively large. Regardless of whether the threshold voltage of the driving module 110 is a positive voltage or a negative voltage, the first power supply VDD can charge the storage module 130 through the threshold compensation module 120 and the driving module 110, so that the voltage of the first terminal s of the driving module 110 is a voltage related to the threshold voltage of the driving module 110, and then the threshold voltage of the driving module 110 is transmitted to the first terminal s of the driving module 110. In this way, regardless of whether the threshold voltage of the driving module 110 is a positive voltage or a negative voltage, the threshold compensation of the driving module 110 can be achieved. When the threshold voltages of different driving modules 110 in the same display panel are different due to the process or the length of use of the driving module 110, threshold compensation can be performed on all driving modules 110, thereby improving the uniformity of the threshold compensation effect. This makes it possible for the driving currents generated by different driving modules 110 to be consistent under the same gray scale, and for the luminous brightness of different light-emitting modules 150 to be consistent, which is conducive to improving the display uniformity of the display panel formed by the pixel circuit, thereby improving the display quality of the display panel, that is, improving the display effect of the display panel, and improving the display performance of the display panel.

[0144] On the basis of the above technical solution, optionally, the pixel circuit further includes a writing module 160 ; the writing module 160 is connected to the control terminal g of the driving module 110 .

[0145] Optionally, before the compensation stage, the driving method of the pixel circuit further includes:

[0146] In the reset phase, the write module transmits the reset voltage to the control terminal of the drive module.

[0147] Specifically, in the reset stage, the writing module 160 transmits the reset voltage Vint to the control terminal g of the driving module 110, and the potential of the control terminal g of the driving module 110 is Vg=Vint, so as to facilitate resetting the control terminal g of the driving module 110. The potential of the first terminal s of the driving module 110 is Vs=Vss, and the reset voltage Vint is greater than the sum of the second power supply voltage Vss provided by the second power supply VSS and the threshold voltage Vth, so that the voltage Vg of the control terminal g of the driving module 110 is greater than the sum of the voltage Vs of the first terminal s of the driving module 110 and the threshold voltage Vth of the driving module 110, that is, Vg-Vs>Vth, so that the driving module 110 is turned on, so that the first power supply VDD can charge the storage module 130 through the threshold compensation module 120 and the driving module 110.

[0148] Optionally, the reset voltage is greater than the sum of a second power supply voltage provided by the second power supply VSS and a threshold voltage.

[0149] Optionally, the writing module 160 and the first end of the storage module 130 are connected to the first node n, and the second end of the storage module 130 is connected to the first end of the driving module 110 .

[0150] Optionally, the driving method of the pixel circuit further includes:

[0151] In the reset phase, the writing module transmits the data voltage to the first node, and the light emitting control module transmits the second power supply voltage provided by the second power supply to the first end of the driving module.

[0152] Specifically, in the reset phase, the writing module 160 transmits the data voltage Vdata to the first node n, and the potential of the first node n is Vn=Vdata, so that the storage module 130 can store a voltage related to the data voltage. The light emitting control module 140 transmits the second power supply voltage Vss provided by the second power supply VSS to the first terminal s of the driving module 110 in the reset phase, so that in the reset phase, the potential of the first terminal s of the driving module 110 is Vs=Vss, which facilitates the control of the driving module 110 to be turned on.

[0153] Optionally, after the compensation stage, the driving method of the pixel circuit further includes:

[0154] In the data writing phase, the writing module transmits the data voltage from the first node to the control end of the driving module;

[0155] In the light-emitting stage, the driving module generates a driving current according to the data voltage, and the light-emitting module emits light in response to the driving current.

[0156] Specifically, in the compensation phase, the writing module 160 transmits the data voltage Vdata to the first node n, maintaining the potential of the first node n as Vn=Vdata. In the data writing phase, the writing module 160 can transmit the data voltage Vdata from the first node n to the control terminal g of the driving module 110, so that the driving module 110 can generate a driving current according to the data voltage Vdata.

[0157] In summary, Fig. 9 is a flowchart of another method for driving a pixel circuit provided by an embodiment of the present invention. Optionally, refer to Fig. 9 , the driving method of the pixel circuit includes:

[0158] S201. In the reset phase, the writing module transmits the reset voltage to the control end of the driving module, the writing module transmits the data voltage to the first node, and the light emitting control module transmits the second power supply voltage provided by the second power supply to the first end of the driving module.

[0159] S202 . In a compensation phase, the threshold compensation module charges the storage module based on a first power source to transmit the threshold voltage of the driving module to the first end of the driving module.

[0160] S203 , in the data writing phase, the writing module transmits the data voltage from the first node to the control end of the driving module.

[0161] S204 , in the light-emitting stage, the driving module generates a driving current according to the data voltage, and the light-emitting module emits light in response to the driving current.

[0162] The technical solution of this embodiment separates the compensation stage from the data writing stage, so that the duration of the compensation stage is not limited by the data writing duration. The compensation time can be adjusted according to demand, thereby compensating for fluctuations in a larger range of threshold voltages, achieving more adequate compensation and better compensation effects.

[0163] The technical solution of the embodiment of the present invention further provides a display panel, Fig.10 is a schematic diagram of a display panel provided by an embodiment of the present invention, with reference to Fig.10The display panel includes the pixel circuit provided by any of the above embodiments. The display panel can be applied to mobile phones, tablets, displays, smart watches, MP3, MP4 or other wearable devices, etc., because it includes the pixel circuit provided by any embodiment of the present invention, and thus has the same beneficial effects, which will not be described in detail here.

[0164] 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.

[0165] 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: include: A driving module, a threshold compensation module, a storage module, a light emitting control module and a light emitting module; The light emitting module, the driving module and the light emitting control module are sequentially connected in series between the first power source and the second power source; The storage module is connected to the first end of the driving module; the threshold compensation module is connected between the first power supply and the second end of the driving module, and the threshold compensation module is used to charge the storage module based on the first power supply during the compensation stage to transmit the threshold voltage of the driving module to the first end of the driving module.

2. The pixel circuit according to claim 1, characterized in that: The pixel circuit also includes a writing module; The writing module is connected to the control end of the driving module, and the writing module is used to control the driving module to be turned on during the compensation phase; Preferably, the writing module is used to transmit a reset voltage to the control end of the driving module in the reset stage and the compensation stage; the reset voltage is greater than the sum of the second power supply voltage provided by the second power supply and the threshold voltage; Preferably, the light emitting control module is used to transmit the second power supply voltage provided by the second power supply to the first end of the driving module during the reset stage; Preferably, the reset phase is before the compensation phase.

3. The pixel circuit according to claim 2, characterized in that: The first end of the writing module and the storage module is connected to a first node, the second end of the storage module is connected to the first end of the driving module, and the writing module is used to transmit the data voltage to the first node in the reset stage; the writing module is also used to transmit the data voltage from the first node to the control end of the driving module in the data writing stage; Preferably, the data writing phase is after the compensation phase.

4. The pixel circuit according to claim 3, characterized in that: The write module includes a reset transistor; The first electrode of the reset transistor is connected to the reset signal line, the second electrode of the reset transistor is connected to the control end of the driving module, and the control electrode of the reset transistor is connected to the first scanning line.

5. The pixel circuit according to claim 4, characterized in that: The write module also includes a data write transistor and a transmission transistor; A first electrode of the data writing transistor is connected to the data line, a second electrode of the data writing transistor is connected to the first node, and a control electrode of the data writing transistor is connected to the second scanning line; The transmission transistor is connected between the first node and the control terminal of the driving module, and the control electrode of the transmission transistor is connected to the first light-emitting control line; Preferably, the first scan line is multiplexed as the second scan line.

6. The pixel circuit according to claim 5, characterized in that: The control end of the threshold compensation module is connected to the third scan line, and the first scan line is multiplexed as the third scan line; Preferably, the control end of the light-emitting control module is connected to a second light-emitting control line, a second light-emitting control signal on the second light-emitting control line has the same waveform as a first light-emitting control signal on the first light-emitting control signal line, and in one frame, a starting time of an invalid level of the second light-emitting control signal is delayed by one line time relative to a starting time of an invalid level of the first light-emitting control signal; Preferably, the first light-emitting control signal and the second light-emitting control signal are generated by the same group of gate driving circuits, the first light-emitting control signal of the pixel circuits in the mth row is provided by the gate driving circuit in the m-1th row, and the second light-emitting control signal is provided by the gate driving circuit in the mth row; or, The first light emitting control signal of the pixel circuit in the mth row is provided by the gate driving circuit in the mth row, and the second light emitting control signal is provided by the gate driving circuit in the (m+1)th row; wherein m is an integer greater than 1.

7. The pixel circuit according to claim 1, characterized in that: The driving module includes a driving transistor, and the light emitting module includes a light emitting diode; The pixel circuit also includes a writing module; A first electrode of the light emitting diode is connected to the first power supply, and a second electrode of the light emitting diode is connected to a second electrode of the driving transistor; The control electrode of the driving transistor is connected to the writing module, and the first electrode of the driving transistor is connected to the light emitting control module; Preferably, the threshold compensation module comprises a threshold compensation transistor, a control electrode of the threshold compensation transistor is connected to the third scan line, a first electrode of the threshold compensation transistor is connected to the first power supply, and a second electrode of the threshold compensation transistor is connected to the second electrode of the driving transistor; Preferably, the light emitting control module comprises a light emitting control transistor, a control electrode of the light emitting control transistor is connected to the second light emitting control line, a first electrode of the light emitting control transistor is connected to the first end of the driving module, and a second electrode of the light emitting control transistor is connected to the second power supply; Preferably, the storage module comprises a storage capacitor, a first electrode of the storage capacitor is connected to the writing module, and a second electrode of the storage capacitor is connected to a first end of the driving module; Preferably, the driving transistor is an N-type transistor.

8. A method for driving a pixel circuit, characterized in that: The pixel circuit comprises a driving module, a threshold compensation module, a storage module, a light-emitting control module and a light-emitting module; the light-emitting module, the driving module and the light-emitting control module are sequentially connected in series between a first power supply and a second power supply; the storage module is connected to a first end of the driving module; the threshold compensation module is connected between the first power supply and a second end of the driving module; The driving method of the pixel circuit comprises: In the compensation stage, the threshold compensation module charges the storage module based on the first power source to transmit the threshold voltage of the driving module to the first end of the driving module.

9. The driving method of the pixel circuit according to claim 8, characterized in that: The pixel circuit further includes a writing module; the writing module is connected to the control end of the driving module; Before the compensation stage, the driving method of the pixel circuit further includes: In the reset phase, the writing module transmits the reset voltage to the control terminal of the driving module; Preferably, the reset voltage is greater than the sum of the second power supply voltage provided by the second power supply and the threshold voltage; Preferably, the first end of the writing module and the storage module are connected to a first node, and the second end of the storage module is connected to the first end of the driving module; The driving method of the pixel circuit further includes: In the reset phase, the writing module transmits the data voltage to the first node, and the light emitting control module transmits the second power supply voltage provided by the second power supply to the first end of the driving module; After the compensation stage, the driving method of the pixel circuit further includes: In the data writing stage, the writing module transmits the data voltage from the first node to the control end of the driving module; In the light emitting stage, the driving module generates a driving current according to the data voltage, and the light emitting module emits light in response to the driving current.

10. A display panel, characterized in that: The pixel circuit comprises the pixel circuit described in any one of claims 1 to 7.

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