Pixel circuit, driving method thereof and display panel

Abstract

The invention discloses a pixel circuit and a driving method thereof and a display panel, the pixel circuit comprises a light emitting control module, a first current control module, a second current control module and a light emitting module, and the light emitting control module is used for driving the light emitting module to emit light; the first current control module and the second current control module are connected to a first node, the first node is connected with the control end of the light emitting control module, and the first current control module and the second current control module are respectively used for simultaneously controlling the potential of the first node according to control signals accessed by the control ends of the first current control module and the second current control module. Therefore, the light-emitting time of the light-emitting module is controlled. According to the scheme, after a row of pixel circuits finish data writing, the corresponding pixels of the row can be controlled to emit light, the light emitting time is controlled through the potential of the first node, the situation that after all the pixel rows are finished, the pixels can emit light after data writing is not needed, the time that the pixels do not emit light is greatly shortened, the display brightness is improved, and the display effect is improved. The display effect 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 continuous development of display technology, micro light emitting diodes (Micro LEDs) are widely used in the display field due to their advantages such as wide color gamut, fast response speed, high brightness and long life.

[0003] At present, Micro LED display panels usually include pixel circuits and light-emitting elements. The pixel circuits usually use digital drive to control the light-emitting elements to emit light. However, the brightness of the display panel in the prior art is low during a picture refresh cycle, and the display brightness cannot be effectively improved. Summary of the invention

[0004] The invention provides a pixel circuit and a driving method thereof and a display panel to improve display brightness.

[0005] According to one aspect of the present invention, a pixel circuit is provided, comprising: a light emitting control module, a first current control module, a second current control module and a light emitting module;

[0006] The light control module is connected between the first power line and the first end of the light emitting module, the second end of the light emitting module is connected to the second power line, and the light control module is used to drive the light emitting module to emit light;

[0007] The first current control module and the second current control module are connected to the first node, the first node is connected to the control end of the light emitting control module, and the first current control module and the second current control module are respectively used to control the potential of the first node simultaneously according to the control signal connected to their own control ends, so as to control the light emitting time of the light emitting module;

[0008] The potential of the first node is associated with the control signal connected to the control end of the first current control module and the control end of the second current control module, and the control signal connected to the control end of the first current control module is different from the control signal connected to the control end of the second current control module.

[0009] According to another aspect of the present invention, a driving method of a pixel circuit is provided, the pixel circuit comprising a light emitting control module, a first current control module, a second current control module and a light emitting module, the light emitting control module is connected between a first power line and a first end of the light emitting module, the second end of the light emitting module is connected to a second power line, the first current control module and the second current control module are connected to a first node, the first node is connected to a control end of the light emitting control module, wherein the potential of the first node is associated with a control signal connected to the control end of the first current control module and the control end of the second current control module, and the control signal connected to the control end of the first current control module is different from the control signal connected to the control end of the second current control module; the driving method of the pixel circuit comprises:

[0010] In the light-emitting stage, the light-emitting control module is controlled to drive the light-emitting module to emit light according to the potential of the first node, and the first current control module and the second current control module are controlled to control the potential of the first node simultaneously according to the control signal connected to their own control ends, so as to control the light-emitting time of the light-emitting module.

[0011] According to another aspect of the present invention, a display panel is provided. The display panel includes the pixel circuit provided by any embodiment of the present invention.

[0012] The technical solution provided by the embodiment of the present invention is to set a first current control module and a second current control module to be connected to a first node, and the first node is connected to the control end of the light control module, and the first current control module and the second current control module are respectively used to control the potential of the first node according to the control signal connected to their own control end at the same time, so as to control the light-emitting time of the light-emitting module. Among them, the potential of the first node is associated with the control signal connected to the control end of the first current control module and the control end of the second current control module. In this solution, the control ability of the first current control module and the second current control module to control the potential of the first node is respectively controlled by connecting different control signals to the control end of the first current control module and the control end of the second current control module, so as to control the potential of the first node. After a row of pixel circuits completes data writing, the pixels corresponding to the row can be controlled to emit light, and the light-emitting time is controlled by the potential of the first node. There is no need to wait for all pixel rows to be completed before data is written and then emit light together, which greatly reduces the time when the pixel does not emit light, so it can greatly increase the upper limit of the pixel light-emitting time within a picture refresh cycle, which is conducive to improving the display brightness and improving the display effect. At the same time, it can reduce transient current, which is conducive to protecting the safety and reliability of the light-emitting module and extending the service life of the light-emitting module.

[0013] 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

[0014] 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.

[0015] Figure 1 A schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0016] Figure 2 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0017] Figure 3 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0018] Figure 4 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0019] Figure 5 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0020] Figure 6 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0021] Figure 7 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0022] Figure 8 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0023] Fig. 9 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0024] Fig.10 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0025] Fig.11 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0026] Fig.12 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0027] Fig.13 A driving timing diagram of another pixel circuit provided by an embodiment of the present invention;

[0028] Fig.14 A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0029] Fig.15 A flowchart of another method for driving a pixel circuit provided by an embodiment of the present invention;

[0030] Fig.16 A schematic structural diagram of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] As described in the background technology, the display panel in the prior art has a low brightness within a picture refresh cycle and cannot effectively improve the display brightness. After careful study by the inventors, it was found that the reason for the above problem is that Micro LED usually controls the average brightness of the pixel within a picture refresh cycle by controlling the light-emitting time within a picture refresh cycle (such as a display frame). When the existing pixel driving circuit is driven by a digital drive method, the light-emitting time is controlled by a SWEEP signal. Here, the SWEEP signal is a global signal. After the data signal is written, all pixel circuits in the entire display panel are uniformly switched to the SWEEP signal for overall pulling, thereby controlling the light-emitting time of the light-emitting device. Therefore, during the data signal writing process, the light-emitting device needs to be controlled to be in an off state. It can only emit light uniformly when the data signal is completely written, resulting in the light-emitting time of the light-emitting device being affected by the data signal writing time of the entire display panel, which limits the entire display panel to only display or extinguish at the same time, so that the pixel circuit has a higher transient current. Moreover, since the data writing time becomes longer, the light emitting time of the light emitting device is shorter, so the light emitting brightness within a picture refresh cycle is low, and the display brightness cannot be effectively improved, resulting in the maximum brightness of the display panel being affected, seriously reducing the display effect of the display panel.

[0034] In view of the above problems, an embodiment of the present invention provides a display panel. 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 light emitting control module 10, a first current control module 20, a second current control module 30 and a light emitting module 40;

[0035] The light control module 10 is connected between the first power line L1 and the first end of the light emitting module 40 . The second end of the light emitting module 40 is connected to the second power line L2 . The light control module 10 is used to drive the light emitting module 40 to emit light.

[0036] The first current control module 20 and the second current control module 30 are connected to the first node N1, and the first node N1 is connected to the control end of the light-emitting control module 10. The first current control module 20 and the second light-emitting time control module 30 are respectively used to control the potential of the first node N1 simultaneously according to the control signal connected to their own control ends to control the light-emitting time of the light-emitting module 40.

[0037] Specifically, the first power line L1 can be used to transmit the first power voltage VDDA, the second power line L2 can be used to transmit the second power voltage VSSA, and the light control module 10 is used to conduct according to the voltage of its own control terminal in the light-emitting stage, and generate a driving current to drive the light-emitting module 40 to emit light. The light-emitting brightness of the light-emitting module 40 is controlled by the light-emitting time of the light-emitting module 40, wherein the longer the light-emitting time, the brighter the light-emitting brightness, and the brighter the corresponding maximum display brightness.

[0038] In this embodiment, the control end of the light-emitting control module 10 is connected to the first node N1, that is, the potential of the first node N1 determines the potential of the control end of the light-emitting control module 10. The potential of the first node N1 is associated with the control signal connected to the control end of the first current control module 20 and the control end of the second current control module 30, and the control signal connected to the control end of the first current control module 20 is different from the control signal connected to the control end of the second current control module 30. Exemplarily, the first current control module 20 is connected to the third power line L3, the second current control module 30 is connected to the fourth power line L4, the control end of the first current control module 20 is connected to the first control signal CON1, and the control end of the second current control module 30 is connected to the second control signal CON2. In the light-emitting stage, the first current control module 20 and the second current control module 30 respectively determine their own driving capabilities according to the first control signal CON1 and the second control signal CON2 connected to their respective control ends, thereby controlling the competitiveness of the third power supply voltage VDDW on the third power line L3 and the fourth power supply voltage VSSW on the fourth power line L4 transmitted to the first node N1, and thereby controlling the potential of the first node N1. If the driving capability of the first control signal CON1 is stronger than that of the second control signal CON2, the first current control module 20 determines the potential of the first node N1 under the action of the first control signal CON1 and the third power supply voltage VDDW. If the driving capability of the second control signal CON2 is stronger than that of the first control signal CON1, the second current control module 30 determines the potential of the first node N1 under the action of the second control signal CON2 and the fourth power supply voltage VSSW.

[0039] The technical solution provided by the embodiment of the present invention is to set a first current control module and a second current control module to be connected to a first node, and the first node is connected to the control end of the light control module, and the first current control module and the second current control module are respectively used to control the potential of the first node according to the control signal connected to their own control end at the same time, so as to control the light-emitting time of the light-emitting module. Among them, the potential of the first node is associated with the control signal connected to the control end of the first current control module and the control end of the second current control module. In this solution, the control ability of the first current control module and the second current control module to control the potential of the first node is respectively controlled by connecting different control signals to the control end of the first current control module and the control end of the second current control module, so as to control the potential of the first node. After a row of pixel circuits completes data writing, the pixels corresponding to the row can be controlled to emit light, and the light-emitting time is controlled by the potential of the first node. There is no need to wait for all pixel rows to be completed before data is written and then emit light together, which greatly reduces the time when the pixel does not emit light, so it can greatly increase the upper limit of the pixel light-emitting time within a picture refresh cycle, which is conducive to improving the display brightness and improving the display effect. At the same time, it can reduce transient current, which is conducive to protecting the safety and reliability of the light-emitting module and extending the service life of the light-emitting module.

[0040] Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2 On the basis of the above technical solution, optionally, the first current control module 20 includes a first driving unit 201 and a first voltage writing unit 202, the first voltage writing unit 202 is connected between the first control signal line CS1 and the first driving unit 201, the control end of the first voltage writing unit 202 is connected to the first scan line, and the first driving unit 201 is connected between the third power line L3 and the first node N1. The second current control module 30 includes a second driving unit 301 and a second voltage writing unit 302, the second voltage writing unit 302 is connected between the second control signal line CS2 and the second driving unit 201, the control end of the second voltage writing unit 302 is connected to the second scan line, and the second driving unit 301 is connected between the fourth power line L4 and the first node N1.

[0041] Specifically, the third power line L3 can be used to transmit the third power voltage VDDW, the fourth power line L4 can be used to transmit the fourth power voltage VSSW, and the first driving unit 201 can generate a current when the third power line L3 is connected to the first node N1 to control the potential of the first node N1. The second driving unit 301 can generate a current when the fourth power line L4 is connected to the first node N1 to control the potential of the first node N1.

[0042] In the first voltage writing stage, the first voltage writing unit 202 responds to the first scan signal S1 on the first scan line and transmits the first control signal CON1 on the first control signal line CS1 to the control end of the first driving unit 201. In the second voltage writing stage, the second voltage writing unit 302 responds to the second scan signal S2 on the second scan line and transmits the second control signal CON2 on the second control signal line CS2 to the control end of the second driving unit 301. In the light-emitting stage, according to the driving capability of the first control signal CON1 and the second control signal CON2, the competitiveness of the third power supply voltage VDDW and the fourth power supply voltage VSSW input is controlled, thereby controlling the potential of the first node N1. The light-emitting control module 10 generates a driving current according to the potential of the first node N1 and the first power supply voltage VDDA, and drives the light-emitting module 40 to emit light. By adjusting the first control signal CON1 and the second control signal CON2, the potential of the first node N1 can be changed, thereby controlling the light-emitting time of the light-emitting module 40.

[0043] In this embodiment, the potential of the first node N1 is controlled by different control signals connected to the first driving unit 201 and the second driving unit 301. There is no need to wait until all pixel rows have completed data writing before emitting light together. When a row of pixels has completed data writing, they can emit light, which greatly improves the pixel light-emitting time, is beneficial to improving the display brightness, and improves the display effect.

[0044] Figure 3 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 3 On the basis of the above technical solution, optionally, the first current control module 20 further includes a first compensation unit 203, the control end of the first compensation unit 203 is connected to the first scan line, the first compensation unit 203 is connected between the second end and the control end of the first driving unit 201, and the first compensation unit 203 is used to compensate for the threshold voltage of the first driving unit 201 in the first voltage writing stage; the first voltage writing unit 202 is connected between the first control signal line CS1 and the first end of the first driving unit 201.

[0045] The first compensation unit 203 can be provided to compensate for the threshold voltage of the first driving unit 201 , thereby ensuring the uniformity and accuracy of the current generated by the first driving unit 201 , and improving the control accuracy of the potential of the first node N1 .

[0046] Continue to refer Figure 3The first current control module 20 further includes a first light-emitting control unit 204 and a second light-emitting control unit 205. The control end of the first light-emitting control unit 204 and the control end of the second light-emitting control unit 205 are both connected to the first light-emitting control signal line. The first end of the first light-emitting control unit 204 is connected to the third power line L3. The second end of the first light-emitting control unit 204 is connected to the first end of the first driving unit 201. The first end of the second light-emitting control unit 205 is connected to the second end of the first driving unit 201. The second end of the second light-emitting control unit 205 is connected to the first node N1. The first light-emitting control unit 204 and the second light-emitting control unit 205 are used to respond to the first light-emitting control signal EM1 transmitted on the first light-emitting control signal line during the light-emitting stage, so that the third power supply voltage VDDW can be transmitted to the first end of the first driving unit 201. The first driving unit 201 generates a current according to the voltages of the control end and the first end to charge the first node N1.

[0047] Similarly, the second current control module 30 also includes a second compensation unit 303, the control end of the second compensation unit 303 is connected to the second scan line, the second compensation unit 303 is connected between the second end and the control end of the second driving unit 301, and the second compensation unit 303 is used to compensate for the threshold voltage of the second driving unit 301 in the second voltage writing stage; the second voltage writing unit 302 is connected between the second control signal line CS2 and the first end of the second driving unit 301.

[0048] The second current control module further includes a third light-emitting control unit 305 and a fourth light-emitting control unit 304. The control end of the third light-emitting control unit 305 and the control end of the fourth light-emitting control unit 304 are both connected to the second light-emitting control signal line. The first end of the third light-emitting control unit 305 is connected to the fourth power line L4. The second end of the third light-emitting control unit 305 is connected to the second end of the second driving unit 301. The first end of the fourth light-emitting control unit 304 is connected to the first end of the second driving unit 301. The second end of the fourth light-emitting control unit 304 is connected to the first node N1. The third light-emitting control unit 305 and the fourth light-emitting control unit 304 are used to be turned on in response to the second light-emitting control signal EM2 transmitted on the first light-emitting control signal line during the light-emitting stage, so that the fourth power supply voltage VSSW can be transmitted to the second driving unit 301. The second driving unit 301 generates a current according to the voltages of the control end and the second end to charge the first node N1.

[0049] In this embodiment, the third power supply voltage VDDW transmitted on the third power supply line L3 may be a high voltage, the fourth power supply voltage VSSW transmitted on the fourth power supply line L4 may be a low voltage, and the third power supply voltage VDDW is greater than the fourth power supply voltage VSSW. Taking the case where the control end of the current control module 10 is turned on when it is at a low potential as an example, in the first voltage writing stage and the second voltage writing stage, the first control signal CON1 and the second control signal CON2 are written to the control end of the first driving unit 201 and the control end of the second driving unit 301 respectively. In the light-emitting stage, the first light-emitting control unit 204 and the second light-emitting control unit 205 are turned on in response to the first light-emitting control signal EM1, the third light-emitting control unit 305 and the fourth light-emitting control unit 304 are turned on in response to the second light-emitting control signal EM2, the current generated by the second driving unit 301 according to the second control signal CON2 is greater than the current generated by the first driving unit 201 according to the first control signal CON1, and the potential of the first node N1 is determined by the second driving unit 301. The light-emitting control module 10 is turned on according to the potential of the first node N1 to drive the light-emitting module 40 to emit light. By adjusting the first control signal CON1 and / or the second control signal CON2, the current generated by the first driving unit 201 according to the first control signal CON1 can be greater than the current generated by the second driving unit 301 according to the second control signal CON2. The potential of the first node N1 is determined by the first driving unit 201, and the light control module 10 can be controlled to be turned off, thereby controlling the light module 40 to be extinguished, so as to achieve the purpose of controlling the light-emitting time. Here, since the first control signal CON1 and the second control signal CON2 are non-global signals, it can be realized that after a row of pixel circuits completes data writing, it can emit light, which greatly improves the light-emitting time within a picture refresh cycle and can effectively improve the display brightness.

[0050] Optionally, in this embodiment, the first voltage writing stage and the second voltage writing stage may overlap, that is, the first voltage writing stage and the second voltage writing stage are performed simultaneously. At this time, the first scan line may be multiplexed as the second scan line to save the number of signal lines.

[0051] Optionally, the first light-emitting control signal line may also be multiplexed as the second light-emitting control signal line.

[0052] Figure 4 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 4On the basis of the above technical solution, optionally, the first current control module 20 further includes a first initialization unit 206, the control end of the first initialization unit 206 is connected to the fourth scan line, the first end of the first initialization unit 206 is connected to the first initialization signal line, the second end of the first initialization unit 206 is connected to the control end of the first driving unit 201, and the first initialization unit 206 is used to respond to the fourth scan signal S4 on the fourth scan line in the first initialization stage, and transmit the first initialization voltage Vref1 on the first initialization signal line to the control end of the first driving unit 201.

[0053] The second current control module 30 also includes a second initialization unit 306, the control end of the second initialization unit 306 is connected to the fourth scan line, the first end of the second initialization unit 306 is connected to the second initialization signal line, and the second end of the second initialization unit 306 is connected to the control end of the second driving unit 301. The second initialization unit 306 is used to respond to the fourth scan signal S4 on the fourth scan line in the first initialization stage, and transmit the second initialization voltage Vref2 on the second initialization signal line to the control end of the second driving unit 301.

[0054] Optionally, the first current control module 20 further includes a first storage unit 208 connected between the third power line L3 and the control end of the first driving unit 201, and the second current control module 30 further includes a second storage unit 307 connected between the first node N1 and the control end of the second driving unit 301. The first storage unit 208 is used to store the voltage of the control end of the first driving unit 201, and the second storage unit 307 is used to store the potential of the control end of the second driving unit 301.

[0055] In the first initialization stage, the first initialization unit 206 is turned on in response to the fourth scan signal S4, and transmits the first initialization voltage Vref1 to the control end of the first driving unit 201 to initialize the control end of the first driving unit 201. At the same time, the second initialization unit 306 is turned on in response to the fourth scan signal S4, and transmits the second initialization voltage Vref2 to the control end of the second driving unit 301 to initialize the control end of the second driving unit 301.

[0056] Optionally, continue to refer to Figure 4 The first current control module 20 also includes a third initialization unit 207, which is connected between the first initialization signal line and the first node N1, and the gate of the third initialization unit 207 is connected to the fifth scan line. The third initialization unit 207 is used to respond to the fifth scan signal S5 on the fifth scan line in the second initialization stage, and transmit the first initialization voltage Vref1 to the control end of the light-emitting control module 10 to initialize the control end of the light-emitting control module 10.

[0057] In this embodiment, the first initialization voltage Vref1 is greater than the second initialization voltage Vref2 to ensure that the second current control module 30 can work normally. Specifically, in the second initialization stage, the third initialization unit 207 transmits the first initialization voltage Vref1 to the first node N1. Since the first node N1 is connected to the first end of the second storage unit 307, the second end of the second storage unit 307 is connected to the control end of the second driving unit 301, and the voltage at the second end of the second storage unit 307 is the second initialization voltage Vref2, in order to ensure that the second driving unit 301 can write the second control signal CON2 in the second voltage writing stage, it is necessary to ensure that there is a voltage difference between the two ends of the second storage unit 307. Therefore, the first initialization voltage Vref1 is set to be greater than the second initialization voltage Vref2.

[0058] Figure 5 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 5 On the basis of the above technical solutions, optionally, the light control module 10 includes a third driving unit 101, a fifth light control unit 102 and a sixth light control unit 103, the control end of the fifth light control unit 102 and the control end of the sixth light control unit 103 are both connected to the fourth light control signal line, the first end of the fifth light control unit 102 is connected to the first power line L1, the second end of the fifth light control unit 102 is connected to the first end of the third driving unit 101, the first end of the sixth light control unit 103 is connected to the second end of the third driving unit 101, the second end of the sixth light control unit 103 is connected to the first end of the light emitting module 40, the control end of the third driving unit 101 is connected to the first node N1, and the third driving unit 101 is used to drive the light emitting module 40 to emit light according to the voltage of its own control end.

[0059] Specifically, in the light-emitting stage, the first driving unit 101 is turned on according to the control terminal voltage, the fifth light-emitting control unit 102 and the sixth light-emitting control unit 103 are turned on in response to the fourth light-emitting control signal EM4 on the fourth light-emitting control signal line, and the first power supply voltage VDDA on the first power line L1 is transmitted to the first end of the third driving unit 101. The third driving unit 101 drives the light-emitting module 40 to emit light according to the voltage at its own control terminal and the first end, and controls the potential of the first node N1 through the first control signal CON1 and the second control signal CON2 to control the light-emitting time of the light-emitting module 40.

[0060] Figure 6 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 6On the basis of the above technical solution, optionally, the light control module 10 further includes a third compensation unit 105 and a third voltage writing unit 104, the control end of the third voltage writing unit 104 and the control end of the third compensation unit 105 are both connected to the sixth scan line, the first end of the third voltage writing unit 104 is connected to the reset voltage signal line, the second end of the third voltage writing unit 104 is connected to the first end of the third driving unit 101, the first end of the third compensation unit 105 is connected to the second end of the third driving unit 101, and the second end of the third compensation unit 105 is connected to the control end of the third driving unit 101, and the third voltage writing unit 104 is used to respond to the sixth scan signal S6 on the sixth scan line in the third initialization stage, and write the reset voltage VCOM on the reset voltage signal line to the control end of the third driving unit 101 via the third compensation unit 105 to turn off the third driving unit 101.

[0061] Specifically, the third voltage writing unit 104 is used to provide an initial voltage, such as a reset voltage VCOM, to the control terminal of the third driving unit 101 in the third initialization stage, so that the third driving unit 101 is in an off state, ensuring that the light-emitting module 40 does not emit light in the black state, which is conducive to improving the phenomenon that the black state is not black. Among them, the third compensation unit 105 is used to perform threshold compensation on the third driving unit 101.

[0062] In this embodiment, the reset voltage VCOM may be a global voltage, and all pixel circuits correspond to a reset voltage VCOM. The reset voltage VCOM is a voltage that can turn off the third driving unit 101, such as a black state voltage. For example, when the third driving unit 101 is a P-type driving transistor, the reset voltage VCOM may be 5V. Here, the reset voltage VCOM is only schematically described, and is not intended to be limiting.

[0063] Optionally, the light emitting control module 10 further includes a third storage unit 106 , and the third storage unit 106 is used to store the voltage of the control terminal of the third driving unit 101 .

[0064] Figure 7 A schematic diagram of another pixel circuit structure provided by an embodiment of the present invention, specifically: Figure 6 The pixel circuit shown is refined into a schematic diagram of the device structure, refer to Figure 7 The first driving unit 201 includes a first transistor M1, the first voltage writing unit 202 includes a second transistor M2, the first compensation unit 203 includes a third transistor M3, the first light emitting control unit 204 includes a fourth transistor M4, and the second light emitting control unit 205 includes a fifth transistor M5.

[0065] The gate of the fourth transistor M4 and the gate of the fifth transistor M5 are both connected to the first light-emitting control signal line, the first electrode of the fourth transistor M4 is connected to the third power line L3, the second electrode of the fourth transistor M4 is connected to the first electrode of the first transistor M1, the second electrode of the first transistor M1 is connected to the first electrode of the fifth transistor M5, and the second electrode of the fifth transistor M5 is connected to the first node N1; the first electrode of the second transistor M2 is connected to the first control signal line CS1, the second electrode of the second transistor M2 is connected to the first electrode of the first transistor M1, the first electrode of the third transistor M3 is connected to the second electrode of the first transistor M1, the second electrode of the third transistor M3 is connected to the gate of the first transistor M1, and the gate of the second transistor M2 and the gate of the third transistor M3 are both connected to the first scan line.

[0066] The second driving unit 301 includes a sixth transistor M6, the second voltage writing unit 302 includes a seventh transistor M7, the second compensation unit 303 includes an eighth transistor M8, the third light-emitting control unit 305 includes a ninth transistor M9, and the fourth light-emitting control unit 304 includes a tenth transistor M10; the gate of the ninth transistor M9 and the gate of the tenth transistor M10 are both connected to the second light-emitting control signal line, the first electrode of the ninth transistor M9 is connected to the fourth power line L4, the second electrode of the ninth transistor M9 is connected to the second electrode of the sixth transistor M6, the second electrode of the sixth transistor M6 is connected to the first electrode of the tenth transistor M10, and the second electrode of the tenth transistor M10 is connected to the first node N1; the first electrode of the seventh transistor M7 is connected to the second control signal line CS2, the second electrode of the seventh transistor M7 is connected to the first electrode of the sixth transistor M6, the first electrode of the eighth transistor M8 is connected to the second electrode of the sixth transistor M6, the second electrode of the eighth transistor M8 is connected to the gate of the sixth transistor M6, and the gate of the seventh transistor M7 and the gate of the eighth transistor M8 are both connected to the second scan line.

[0067] The first initialization unit 206 includes an eleventh transistor M11, the gate of the eleventh transistor M11 is connected to the fourth scan line, the first electrode of the eleventh transistor M11 is connected to the first initialization signal line, and the second electrode of the eleventh transistor M11 is connected to the control end of the first driving unit 201; the second initialization unit 306 includes a twelfth transistor M12, the gate of the twelfth transistor M12 is connected to the fourth scan line, the first electrode of the twelfth transistor M12 is connected to the second initialization signal line, and the second electrode of the twelfth transistor M12 is connected to the control end of the second driving unit 301.

[0068] The third initialization unit 207 includes a thirteenth transistor M13, the gate of the thirteenth transistor M13 is connected to the fifth scan line, the first electrode of the thirteenth transistor M13 is connected to the first initialization signal line, and the second electrode of the thirteenth transistor M13 is connected to the first node N1; the first storage unit 208 includes a first capacitor C1, and the second storage unit 307 includes a second capacitor C2, the first capacitor C1 is connected between the third power line L3 and the control end of the first driving unit 201, and the second capacitor C2 is connected between the first node N1 and the control end of the second driving unit 301.

[0069] The third driving unit 101 includes a fourteenth transistor M14, the fifth light-emitting control unit 102 includes a fifteenth transistor M15, and the sixth light-emitting control unit 103 includes a sixteenth transistor M16, the gate of the fifteenth transistor M15 and the gate of the sixteenth transistor M16 are both connected to the fourth light-emitting control signal line, the first electrode of the fifteenth transistor M15 is connected to the first power line L1, the second electrode of the fifteenth transistor M15 is connected to the first electrode of the fourteenth transistor M14, the second electrode of the fourteenth transistor M14 is connected to the first electrode of the sixteenth transistor M16, the second electrode of the sixteenth transistor M16 is connected to the first end of the light-emitting module 40, and the gate of the fourteenth transistor M14 is connected to the first node N1.

[0070] The third voltage writing unit 104 includes a seventeenth transistor M17, the third compensation unit 105 includes an eighteenth transistor M18, the third storage unit 106 includes a third capacitor C3, the gate of the seventeenth transistor M17 and the gate of the eighteenth transistor M18 are both connected to the sixth scan line, the first electrode of the seventeenth transistor M17 is connected to the reset voltage signal line, the second electrode of the seventeenth transistor M17 is connected to the first end of the third driving unit 101, the first electrode of the eighteenth transistor M18 is connected to the second end of the third driving unit 101, the second electrode of the eighteenth transistor M18 is connected to the control end of the third driving unit 101, and the third capacitor C3 is connected between the first power line L1 and the control end of the third driving unit 101.

[0071] In this embodiment, the light control module 40 includes a light emitting diode D1, the anode of the light emitting diode D1 may be the first end of the light emitting module 40, and the cathode of the light emitting diode D1 may be the second end of the light emitting module 40. The light emitting diode D1 may be a micro light emitting diode such as Micro LED, Mini LED, or a light emitting device such as OLED, LED, etc.

[0072] Figure 8 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention can be applied to Figure 7 The pixel circuit shown, combined with Figure 7 and Figure 8Taking the case where all transistors are P-type transistors as an example, the working process of the pixel circuit at least includes a first stage T1, a second stage T2, a third stage T3 and a fourth stage T4.

[0073] In the first stage T1 (the first initialization stage and the second initialization stage), the first scanning signal S1 is at a high level, the second scanning signal S2 is at a high level, the fourth scanning signal S4 is at a low level, the fifth scanning signal S5 is at a low level, the sixth scanning signal S6 is at a high level, the first light-emitting control signal EM1 is at a high level, the second light-emitting control signal EM2 is at a high level, and the fourth light-emitting control signal EM4 is at a high level. Therefore, the eleventh transistor M11, the twelfth transistor M12, and the thirteenth transistor M13 are turned on, and the first initialization voltage Vref1 is transmitted to the gate of the first transistor M1 through the eleventh transistor M11 to initialize the gate potential of the first transistor M1, and is transmitted to the first node N1 through the thirteenth transistor M13 to initialize the potential of the first node N1. At the same time, the second initialization voltage Vref2 is transmitted to the gate of the sixth transistor M6 through the twelfth transistor M12 to initialize the gate potential of the sixth transistor M6. At this time, the voltage difference across the second capacitor C2 is Vref1-Vref2.

[0074] In the T2 stage (the first voltage writing stage and the second voltage writing stage), the first scanning signal S1 is at a low level, the second scanning signal S2 is at a low level, the fourth scanning signal S4 is at a high level, the fifth scanning signal S5 is at a low level, the sixth scanning signal S6 is at a high level, the first light-emitting control signal EM1 is at a high level, the second light-emitting control signal EM2 is at a high level, and the fourth light-emitting control signal EM4 is at a high level. Therefore, the second transistor M2, the third transistor M3, the seventh transistor M7, the eighth transistor M8 and the thirteenth transistor M13 are turned on, the potential of the first node N1 is maintained at the first initialization voltage Vref1, and the first control signal CON1 is transmitted to the gate of the first transistor M1 through the second transistor M2, the first transistor M1 and the third transistor M3, until the gate voltage of the first transistor M1 is CON1-Vth1, the first transistor M1 is turned off, and the first capacitor C1 stores the gate voltage of the first transistor M1. Wherein, Vth1 is the threshold voltage of the first transistor M1.

[0075] The second control signal CON2 is transmitted to the gate of the sixth transistor M6 via the seventh transistor M7, the sixth transistor M6 and the eighth transistor M8, until the gate voltage of the sixth transistor M6 is CON2-Vth6, the sixth transistor M6 is turned off, and the second capacitor C2 stores the gate voltage of the sixth transistor M6. Vth6 is the threshold voltage of the sixth transistor M6.

[0076] In the T3 stage (the third initialization stage), the first scan signal S1 is at a high level, the second scan signal S2 is at a high level, the fourth scan signal S4 is at a high level, the fifth scan signal S5 is at a high level, the sixth scan signal S6 is at a low level, the first light-emitting control signal EM1 is at a high level, the second light-emitting control signal EM2 is at a high level, and the fourth light-emitting control signal EM4 is at a high level. Therefore, the seventeenth transistor M17 and the eighteenth transistor M18 are turned on. Since the gate voltage of the fourteenth transistor M14 is the same as the voltage of the first node N1, both of which are the first initialization voltage Vref1, the fourteenth transistor M14 is in a conducting state, and the reset voltage VCOM is transmitted to the gate of the fourteenth transistor M14 through the seventeenth transistor M17, the fourteenth transistor M14 and the eighteenth transistor M18, until the gate voltage of the fourteenth transistor M14 is VCOM-Vth14, the fourteenth transistor M14 is turned off. Wherein, Vth14 is the threshold voltage of the fourteenth transistor M14. Here, the reset voltage VCOM is used to provide an initial voltage for the fourteenth transistor M14 to prevent the fourteenth transistor M14 from generating a driving current to drive the light-emitting diode D1 to emit light when the black state is displayed, thereby preventing the black state from being not black.

[0077] In the T4 phase (light-emitting phase), the first scanning signal S1 is at a high level, the second scanning signal S2 is at a high level, the fourth scanning signal S4 is at a high level, the fifth scanning signal S5 is at a high level, the sixth scanning signal S6 is at a high level, the first light-emitting control signal EM1 is at a low level, the second light-emitting control signal EM2 is at a low level, and the fourth light-emitting control signal EM4 is at a low level. Therefore, the fourth transistor M4, the fifth transistor M5, the ninth transistor M9, the tenth transistor M10, the fifteenth transistor M15, and the sixteenth transistor M16 are turned on. Under the action of the second control signal CON2, the current generated by the sixth transistor M6 is greater than the current generated by the first transistor M1, and the fourth power supply voltage VSSW charges the first node N1. When the voltage of the first node N1 reaches the threshold voltage of the fourteenth transistor M14, the fourteenth transistor M14 is turned on, and the fourteenth transistor M14 generates a driving current to drive the light-emitting diode D1 to emit light.

[0078] During the light emitting process, the potential of the first node N1 may be controlled by adjusting the first control signal CON1 and the second control signal CON2, thereby controlling the light emitting time of the light emitting diode D1.

[0079] It should be noted that when the sixth transistor M6 controls the potential of the first node N1 according to the second control signal CON2 or the first transistor M1 controls the potential of the first node N1 according to the first control signal CON1, since the charge stored on the third capacitor C3 is proportional to the voltage, the potential of the first node N1 can change linearly within a picture refresh cycle, and by controlling the ratio of the first control signal CON1 to the second control signal CON2, the rate of change of the potential of the first node N1 can be controlled, and the light-emitting time can be better controlled. After the pixel circuit of this row is charged, it can emit light without waiting for the pixel row to be fully charged, which can increase the light-emitting time of the light-emitting diode D1, thereby facilitating improving the display brightness.

[0080] Fig. 9 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig. 9 On the basis of the above technical solutions, optionally, the first light-emitting control signal line can be multiplexed into the second light-emitting control signal line and the fourth light-emitting control signal line, the first scan line can be multiplexed into the second scan line, and the first power line L1 can be multiplexed into the third power line L3, and the second power line L2 can be multiplexed into the fourth power line L4, so as to save the number of signal lines and facilitate the realization of high PPI. Among them, Fig. 9 The working process of the pixel circuit shown is similar to Figure 7 The working process of the pixel circuit shown is the same and will not be repeated here.

[0081] Optionally, the first control signal CON1 and the second control signal CON2 may also be outputted by the same signal line in a time-sharing manner, so as to further save the number of signal lines. Fig.10 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.10 , the control end of the first current control module 20 or the control end of the second current control module 30 is connected to the first control signal line CS1, and the first control signal line CS1 is used to transmit the first control signal CON1 in the first voltage writing stage and transmit the second control signal CON2 in the second voltage writing stage;

[0082] The first current control module 20 includes a first driving unit 201, and the second current control module 30 includes a second driving unit 301. The first driving unit 201 is connected between the third power line L3 and the first node N1, and the second driving unit 301 is connected between the fourth power line L4 and the first node N1; wherein, the control end of the first driving unit 201 is the control end of the first current control module 20, and the control end of the second driving unit 301 is the control end of the second current control module 30. The control end of the first driving unit 201 is connected to the first control signal CON1 in the first voltage writing stage, and the first driving unit 201 is used to control the potential of the first node N1 according to the voltage of its own control end in the light-emitting stage. The control end of the second driving unit 301 is connected to the second control signal CON2 in the second voltage writing stage, and the second driving unit 301 is used to control the potential of the first node N1 according to the voltage of its own control end in the light-emitting stage.

[0083] Among them, there can be many ways to connect the first control signal line CS1 to the control end of the first current control module 20 or the control end of the second current control module 30. For example, it can be connected to the control end of the first current control module 20 and the control end of the second current control module 30 respectively through a switch control unit to transmit the first control signal CON1 to the control end of the first current control module 20 and the second control signal CON2 to the control end of the second current control module 30 in a time-sharing manner.

[0084] As a preferred implementation of this embodiment, continue to refer to Fig.10 The first current control module 20 also includes a first compensation unit 203 and a first light-emitting control unit 204, the control end of the first compensation unit 203 is connected to the first scan line, the first end of the first compensation unit 203 is connected to the first end of the first driving unit 201, the second end of the first compensation unit 203 is connected to the control end of the first driving unit 201, the control end of the first light-emitting control unit 204 is connected to the first light-emitting control signal line, the first end of the first light-emitting control unit 204 is connected to the third power line L3, the second end of the first light-emitting control unit 204 is connected to the first end of the first driving unit 201, and the second end of the first driving unit 201 is connected to the first node N1.

[0085] The second current control module 30 further includes a second voltage writing unit 302, a second compensation unit 303, a third light-emitting control unit 305 and a fourth light-emitting control unit 304, wherein the second voltage writing unit 302 is connected between the first control signal line CS1 and the first end of the second driving unit 301, the control end of the second voltage writing unit 302 is connected to the third scan line, the control end of the second compensation unit 303 is connected to the second scan line, the first end of the second compensation unit 303 is connected to the second end of the second driving unit 301, the second end of the second compensation unit 303 is connected to the control end of the second driving unit 301, the control end of the third light-emitting control unit 305 is connected to the second light-emitting control signal line, the control end of the fourth light-emitting control unit 304 is connected to the third light-emitting control signal line, the first end of the third light-emitting control unit 305 is connected to the fourth power line L4, the second end of the third light-emitting control unit 305 is connected to the second end of the first driving unit 301, the first end of the fourth light-emitting control unit 304 is connected to the first end of the first driving unit 301, and the second end of the fourth light-emitting control unit 304 is connected to the first node N1;

[0086] Among them, the second voltage writing unit 302 is used to respond to the third scanning signal on the third scanning line in the second voltage writing stage, and transmit the second control signal CON2 on the first control signal line CS1 to the control end of the second driving unit via the second compensation unit 303, and respond to the third scanning signal in the first voltage writing stage to transmit the first control signal CON1 on the first control signal line CS1 to the control end of the first driving unit 201 via the fourth light-emitting control unit 304 and the first compensation unit 204.

[0087] Fig.11 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.11 The first current control module 20 further includes a first initialization unit 206, the control end of the first initialization unit 206 is connected to the fourth scan line, the first end of the first initialization unit 206 is connected to the first initialization signal line, the second end of the first initialization unit 206 is connected to the control end of the first driving unit 201, and the first initialization unit 206 is used to respond to the fourth scan signal S4 on the fourth scan line in the first initialization stage, and transmit the first initialization voltage Vref1 on the first initialization signal line to the control end of the first driving unit 201. The first current control module 20 further includes a third initialization unit 207, the third initialization unit 207 is connected between the first initialization signal line and the first node N1, the gate of the third initialization unit 207 is connected to the fifth scan line, and the third initialization unit 207 is used to respond to the fifth scan signal S5 on the fifth scan line in the second initialization stage, and transmit the first initialization voltage Vref1 to the control end of the light emitting control module 10 to initialize the control end of the light emitting control module 10.

[0088] The second current control module 30 also includes a second initialization unit 306, the control end of the second initialization unit 306 is connected to the fourth scan line, the first end of the second initialization unit 306 is connected to the second initialization signal line, and the second end of the second initialization unit 306 is connected to the control end of the second driving unit 301. The second initialization unit 306 is used to respond to the fourth scan signal S4 on the fourth scan line in the first initialization stage, and transmit the second initialization voltage Vref2 on the second initialization signal line to the control end of the second driving unit 301.

[0089] The light control module 10 includes the units or modules provided by any of the above embodiments.

[0090] Fig.12 A schematic diagram of another pixel circuit structure provided by an embodiment of the present invention, specifically: Fig.11 The pixel circuit shown is refined into a schematic structural diagram of a device. The connection structure of each transistor can refer to the relevant description in the above embodiment, which will not be repeated here. Fig.13 Another driving timing diagram of a pixel circuit provided in an embodiment of the present invention can be applied to Fig.12 The pixel circuit shown in Figure 2 is referenced Fig.12 and Fig.13 The working process of the pixel circuit provided in this embodiment includes: stage T1, stage T21, stage T22, stage T3 and stage T4.

[0091] In the first stage T1 (the first initialization stage and the second initialization stage), Figure 7 The pixel circuit shown in the figure has the same working process in the T1 stage. Figure 7 Related description.

[0092] In the T21 stage (second voltage writing stage), the first scan signal S1 is high, the second scan signal S2 is low, the third scan signal S3 is low, the fourth scan signal S4 is high, the fifth scan signal S5 is low, the sixth scan signal S6 is high, the first light-emitting control signal EM1 is high, the second light-emitting control signal EM2 is high, the third light-emitting control signal EM3 is high, and the fourth light-emitting control signal EM4 is high. Therefore, the seventh transistor M7, the eighth transistor M8 and the thirteenth transistor M13 are turned on, and the first initialization voltage Vref1 is transmitted to the first node N1 through the thirteenth transistor M13 to initialize the potential of the first node N1. The second control signal CON2 is transmitted on the first control signal line CS1, and the second control signal CON2 is transmitted to the gate of the sixth transistor M6 through the seventh transistor M7, the sixth transistor M6 and the eighth transistor M8, until the gate voltage of the sixth transistor M6 is CON2-Vth6, the sixth transistor M6 is turned off, and the second capacitor C2 stores the gate voltage of the sixth transistor M6. Wherein, Vth6 is the threshold voltage of the sixth transistor M6.

[0093] In the T22 stage (the first voltage writing stage), the first scanning signal S1 is at a low level, the second scanning signal S2 is at a high level, the third scanning signal S3 is at a low level, the fourth scanning signal S4 is at a high level, the fifth scanning signal S5 is at a high level, the sixth scanning signal S6 is at a high level, the first light-emitting control signal EM1 is at a high level, the second light-emitting control signal EM2 is at a high level, the third light-emitting control signal EM3 is at a low level, and the fourth light-emitting control signal EM4 is at a high level. Therefore, the seventh transistor M7, the tenth transistor M10, and the third transistor M3 are turned on, the first control signal CON1 is transmitted on the first control signal line CS1, and the first control signal CON1 is transmitted to the gate of the first transistor M1 through the seventh transistor M7, the tenth transistor M10, the first transistor M1, and the third transistor M3, until the gate voltage of the first transistor M1 is CON1-Vth1, the first transistor M1 is turned off, and the first capacitor C1 stores the gate voltage of the first transistor M1. Wherein, Vth1 is the threshold voltage of the first transistor M1.

[0094] In the T3 stage (the third initialization stage) and the T4 stage (the light-emitting stage), Figure 7 The pixel circuit shown in the figure has the same working process in the T1 stage. Figure 7 Related description.

[0095] The pixel circuit provided in this embodiment can reduce the number of signal lines and transistors by multiplexing the first control signal line CS1, which is beneficial to simplifying the structure of the entire pixel circuit.

[0096] Optionally, an embodiment of the present invention further provides a method for driving a pixel circuit, which can be used to drive the pixel circuit provided by any of the above embodiments. The method for driving a pixel circuit includes:

[0097] In the light-emitting stage, the light-emitting control module is controlled to drive the light-emitting module to emit light according to the potential of the first node, and the first current control module and the second current control module are controlled to control the potential of the first node simultaneously according to the control signal connected to their own control ends, so as to control the light-emitting time of the light-emitting module.

[0098] This solution controls the control capability of the first current control module and the second current control module on the potential of the first node by connecting different control signals to the control end of the first current control module and the control end of the second current control module, thereby controlling the potential of the first node. After a row of pixel circuits completes data writing, the pixels corresponding to the row can be controlled to emit light, and the light emission time is controlled by the potential of the first node. There is no need to wait for all pixel rows to be completed before data is written and then emit light together, which greatly reduces the time when the pixels are not emitting light. Therefore, the upper limit of the pixel light emission time within a picture refresh cycle can be greatly improved, which is conducive to improving display brightness and display effect. At the same time, it can reduce transient current, which is conducive to protecting the safety and reliability of the light-emitting module and extending the service life of the light-emitting module.

[0099] Fig.14 A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention, referring to Fig.14 , the driving method of the pixel circuit provided in this embodiment includes:

[0100] S111 . In a second voltage writing phase, controlling a second voltage writing unit to respond to a second scanning signal on a second scanning line, and transmitting a second control signal on a second control signal line to a control end of a second driving unit.

[0101] S121. In a first voltage writing phase, controlling a first voltage writing unit to respond to a first scanning signal on a first scanning line, and transmitting a first control signal on a first control signal line to a control end of a first driving unit.

[0102] S130. In the light-emitting stage, the first driving unit is controlled to control the potential of the first node according to the first control signal and the second driving unit is controlled to control the potential of the first node according to the second control signal at the same time, so as to control the light-emitting control module to drive the light-emitting module to emit light according to the potential of the first node, and the potential of the first node is adjusted by the first control signal and the second control signal to control the light-emitting time of the light-emitting module.

[0103] in, Fig.14 The specific working process of the driving method shown can refer to the above embodiment. Figure 7 and Figure 8 The relevant descriptions are not repeated here, and the same beneficial effects as described in the above embodiments are achieved.

[0104] Fig.15 A flowchart of another pixel circuit driving method provided by an embodiment of the present invention, referring to Fig.15 , the driving method of the pixel circuit provided in this embodiment includes:

[0105] S112, in the second voltage writing stage, controlling the second voltage writing unit to respond to the third scanning signal on the third scanning line, and transmitting the second control signal on the first control signal line to the control end of the second driving unit via the second compensation unit.

[0106] S122. In the first voltage writing stage, control the second voltage writing unit to transmit the first control signal on the first control signal line to the control end of the first driving unit via the fourth light emitting control unit and the first compensation unit in response to the third scanning signal.

[0107] S130. In the light-emitting stage, the first driving unit is controlled to control the potential of the first node according to the first control signal and the second driving unit is controlled to control the potential of the first node according to the second control signal at the same time, so as to control the light-emitting control module to drive the light-emitting module to emit light according to the potential of the first node, and the potential of the first node is adjusted by the first control signal and the second control signal to control the light-emitting time of the light-emitting module.

[0108] in, Fig.15 The specific working process of the driving method shown can refer to the above embodiment. Fig.12 and Fig.13 The relevant descriptions are not repeated here, and the same beneficial effects as described in the above embodiments are achieved.

[0109] Optionally, an embodiment of the present invention further provides a display panel, the display panel comprising the pixel circuit provided by any embodiment of the present invention, Fig.16 A schematic diagram of a display panel according to an embodiment of the present invention is provided. The display panel 200 can not only Fig.16 The mobile phone panel shown can also be a display panel of electronic devices such as a tablet, a mobile phone, a watch, a wearable device, and a car display, a camera display, a television, and a computer screen. Since the display panel includes the pixel circuit provided by any embodiment of the present invention, the display panel provided by the embodiment of the present invention also has the beneficial effects described in any embodiment of the present invention.

[0110] 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.

[0111] 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 light emitting control module, a first current control module, a second current control module and a light emitting module; The light control module is connected between the first power line and the first end of the light emitting module, the second end of the light emitting module is connected to the second power line, and the light control module is used to drive the light emitting module to emit light; The first current control module and the second current control module are connected to a first node, the first node is connected to the control end of the light emitting control module, and the first current control module and the second current control module are respectively used to control the potential of the first node simultaneously according to the control signal connected to their own control ends, so as to control the light emitting time of the light emitting module; The potential of the first node is associated with control signals connected to the control end of the first current control module and the control end of the second current control module, and the control signal connected to the control end of the first current control module is different from the control signal connected to the control end of the second current control module.

2. The pixel circuit according to claim 1, characterized in that: The first current control module includes a first driving unit and a first voltage writing unit; The first voltage writing unit is connected between the first control signal line and the first driving unit, the control end of the first voltage writing unit is connected to the first scanning line, and the first voltage writing unit is used to respond to the first scanning signal on the first scanning line in a first voltage writing stage, and transmit the first control signal on the first control signal line to the control end of the first driving unit; The first driving unit is connected between the third power line and the first node, and is used to control the potential of the first node according to the voltage of its control terminal during the light-emitting stage; The second current control module includes a second driving unit and a second voltage writing unit, the second voltage writing unit is connected between the second control signal line and the second driving unit, the control end of the second voltage writing unit is connected to the second scanning line, and the second voltage writing unit is used to respond to the second scanning signal on the second scanning line in the second voltage writing stage, and transmit the second control signal on the second control signal line to the control end of the second driving unit; The second driving unit is connected between the fourth power line and the first node, and is used to control the potential of the first node according to the voltage of its control terminal during the light emitting stage; Preferably, the first voltage writing phase overlaps with the second voltage writing phase, and the first scan line is multiplexed as the second scan line.

3. The pixel circuit according to claim 2, characterized in that: The first current control module further includes a first compensation unit, the control end of the first compensation unit is connected to the first scan line, the first compensation unit is connected between the second end and the control end of the first driving unit, and the first compensation unit is used to compensate for the threshold voltage of the first driving unit in the first voltage writing stage; the first voltage writing unit is connected between the first control signal line and the first end of the first driving unit; Preferably, the first current control module further includes a first light-emitting control unit and a second light-emitting control unit, wherein the control end of the first light-emitting control unit and the control end of the second light-emitting control unit are both connected to the first light-emitting control signal line, the first end of the first light-emitting control unit is connected to the third power line, the second end of the first light-emitting control unit is connected to the first end of the first driving unit, the first end of the second light-emitting control unit is connected to the second end of the first driving unit, and the second end of the second light-emitting control unit is connected to the first node; Preferably, the first driving unit includes a first transistor, the first voltage writing unit includes a second transistor, the first compensation unit includes a third transistor, the first light emitting control unit includes a fourth transistor, and the second light emitting control unit includes a fifth transistor; The gate of the fourth transistor and the gate of the fifth transistor are both connected to the first light emission control signal line, the first electrode of the fourth transistor is connected to the third power line, the second electrode of the fourth transistor is connected to the first electrode of the first transistor, the second electrode of the first transistor is connected to the first electrode of the fifth transistor, and the second electrode of the fifth transistor is connected to the first node; A first electrode of the second transistor is connected to the first control signal line, a second electrode of the second transistor is connected to the first electrode of the first transistor, a first electrode of the third transistor is connected to the second electrode of the first transistor, a second electrode of the third transistor is connected to the gate of the first transistor, and the gate of the second transistor and the gate of the third transistor are both connected to the first scan line; Preferably, the second current control module further includes a second compensation unit, the control end of the second compensation unit is connected to the second scan line, the second compensation unit is connected between the second end and the control end of the second driving unit, and the second compensation unit is used to compensate for the threshold voltage of the second driving unit in the second voltage writing stage; the second voltage writing unit is connected between the second control signal line and the first end of the second driving unit; The second current control module further includes a third light-emitting control unit and a fourth light-emitting control unit, wherein the control end of the third light-emitting control unit and the control end of the fourth light-emitting control unit are both connected to the second light-emitting control signal line, the first end of the third light-emitting control unit is connected to the fourth power line, the second end of the third light-emitting control unit is connected to the second end of the second driving unit, the first end of the fourth light-emitting control unit is connected to the first end of the second driving unit, and the second end of the fourth light-emitting control unit is connected to the first node; Preferably, the first light-emitting control signal line is multiplexed as the second light-emitting control signal line; Preferably, the second driving unit includes a sixth transistor, the second voltage writing unit includes a seventh transistor, the second compensation unit includes an eighth transistor, the third light emitting control unit includes a ninth transistor, and the fourth light emitting control unit includes a tenth transistor; The gate of the ninth transistor and the gate of the tenth transistor are both connected to the second light-emitting control signal line, the first electrode of the ninth transistor is connected to the fourth power line, the second electrode of the ninth transistor is connected to the second electrode of the sixth transistor, the second electrode of the sixth transistor is connected to the first electrode of the tenth transistor, and the second electrode of the tenth transistor is connected to the first node; the first electrode of the seventh transistor is connected to the second control signal line, the second electrode of the seventh transistor is connected to the first electrode of the sixth transistor, the first electrode of the eighth transistor is connected to the second electrode of the sixth transistor, the second electrode of the eighth transistor is connected to the gate of the sixth transistor, and the gate of the seventh transistor and the gate of the eighth transistor are both connected to the second scan line.

4. The pixel circuit according to claim 1, characterized in that: The control end of the first current control module or the control end of the second current control module is connected to a first control signal line, and the first control signal line is used to transmit a first control signal in a first voltage writing phase and to transmit a second control signal in a second voltage writing phase; Preferably, the first current control module includes a first driving unit, and the second current control module includes a second driving unit, the first driving unit is connected between the third power line and the first node, and the second driving unit is connected between the fourth power line and the first node; wherein, the control end of the first driving unit is the control end of the first current control module, the control end of the second driving unit is the control end of the second current control module, the control end of the first driving unit is connected to the first control signal in the first voltage writing stage, and the first driving unit is used to control the potential of the first node according to the voltage of its own control end in the light-emitting stage, the control end of the second driving unit is connected to the second control signal in the second voltage writing stage, and the second driving unit is used to control the potential of the first node according to the voltage of its own control end in the light-emitting stage.

5. The pixel circuit according to claim 4, characterized in that: The first current control module further includes a first compensation unit and a first light-emitting control unit, wherein the control end of the first compensation unit is connected to the first scan line, the first end of the first compensation unit is connected to the first end of the first driving unit, the second end of the first compensation unit is connected to the control end of the first driving unit, the control end of the first light-emitting control unit is connected to the first light-emitting control signal line, the first end of the first light-emitting control unit is connected to the third power line, the second end of the first light-emitting control unit is connected to the first end of the first driving unit, and the second end of the first driving unit is connected to the first node; The second current control module also includes a second voltage writing unit, a second compensation unit, a third light-emitting control unit and a fourth light-emitting control unit, wherein the second voltage writing unit is connected between the first control signal line and the first end of the second driving unit, the control end of the second voltage writing unit is connected to the third scan line, the control end of the second compensation unit is connected to the second scan line, the first end of the second compensation unit is connected to the second end of the second driving unit, the second end of the second compensation unit is connected to the control end of the second driving unit, the control end of the third light-emitting control unit is connected to the second light-emitting control signal line, the control end of the fourth light-emitting control unit is connected to the third light-emitting control signal line, the first end of the third light-emitting control unit is connected to the fourth power line, the second end of the third light-emitting control unit is connected to the second end of the first driving unit, the first end of the fourth light-emitting control unit is connected to the first end of the first driving unit, and the second end of the fourth light-emitting control unit is connected to the first node; Among them, the second voltage writing unit is used to respond to the third scanning signal on the third scanning line in the second voltage writing stage, and transmit the second control signal on the first control signal line to the control end of the second driving unit via the second compensation unit, and respond to the third scanning signal in the first voltage writing stage to transmit the first control signal on the first control signal line to the control end of the first driving unit via the fourth light-emitting control unit and the first compensation unit.

6. The pixel circuit according to claim 2 or 4, characterized in that: The first current control module further includes a first initialization unit, wherein a control end of the first initialization unit is connected to a fourth scan line, a first end of the first initialization unit is connected to a first initialization signal line, and a second end of the first initialization unit is connected to a control end of the first driving unit, and the first initialization unit is used to respond to a fourth scan signal on the fourth scan line in a first initialization stage, and transmit a first initialization voltage on the first initialization signal line to the control end of the first driving unit; The second current control module further includes a second initialization unit, a control end of the second initialization unit is connected to the fourth scan line, a first end of the second initialization unit is connected to the second initialization signal line, a second end of the second initialization unit is connected to the control end of the second driving unit, and the second initialization unit is used to respond to the fourth scan signal on the fourth scan line in the first initialization stage and transmit the second initialization voltage on the second initialization signal line to the control end of the second driving unit; Wherein, the first initialization voltage is greater than the second initialization voltage; Preferably, the first initialization unit comprises an eleventh transistor, a gate of the eleventh transistor is connected to the fourth scan line, a first electrode of the eleventh transistor is connected to the first initialization signal line, and a second electrode of the eleventh transistor is connected to the control end of the first driving unit; Preferably, the second initialization unit comprises a twelfth transistor, a gate of the twelfth transistor is connected to the fourth scan line, a first electrode of the twelfth transistor is connected to the second initialization signal line, and a second electrode of the twelfth transistor is connected to the control end of the second driving unit; Preferably, the first current control module further includes a third initialization unit, a gate of the third initialization unit is connected to the fifth scan line, a first electrode of the third initialization unit is connected to the first initialization signal line, a second electrode of the third initialization unit is connected to the first node, and the third initialization unit is used to respond to the fifth scan signal on the fifth scan line in the second initialization stage, transmit the first initialization voltage to the control end of the light emitting control module, so as to initialize the control end of the light emitting control module; Preferably, the first current control module further includes a first storage unit connected to the control end of the first drive unit; the second current control module further includes a second storage unit connected to the control end of the second drive unit.

7. The pixel circuit according to claim 1, characterized in that: The light control module includes a third driving unit, a fifth light control unit and a sixth light control unit, the control end of the fifth light control unit and the control end of the sixth light control unit are both connected to a fourth light control signal line, a first end of the fifth light control unit is connected to the first power line, a second end of the fifth light control unit is connected to a first end of the third driving unit, a first end of the sixth light control unit is connected to a second end of the third driving unit, a second end of the sixth light control unit is connected to a first end of the light emitting module, a control end of the third driving unit is connected to the first node, and the third driving unit is used to drive the light emitting module to emit light according to a voltage at its control end; Preferably, the light emitting control module further comprises a third compensation unit and a third voltage writing unit, the control end of the third voltage writing unit and the control end of the third compensation unit are both connected to the sixth scan line, the first end of the third voltage writing unit is connected to the reset voltage signal line, the second end of the third voltage writing unit is connected to the first end of the third driving unit, the first end of the third compensation unit is connected to the second end of the third driving unit, the second end of the third compensation unit is connected to the control end of the third driving unit, and the third voltage writing unit is used to respond to the sixth scan signal on the sixth scan line in a third initialization stage, and write the reset voltage on the reset voltage signal line to the control end of the third driving unit via the third compensation unit to turn off the third driving unit; Preferably, the light emitting control module further comprises a third storage unit, and the third storage unit is connected to the control end of the third driving unit.

8. A method for driving a pixel circuit, characterized in that: The pixel circuit comprises a light-emitting control module, a first current control module, a second current control module and a light-emitting module, wherein the light-emitting control module is connected between a first power line and a first end of the light-emitting module, the second end of the light-emitting module is connected to a second power line, the first current control module and the second current control module are connected to a first node, and the first node is connected to a control end of the light-emitting control module, wherein the potential of the first node is associated with a control signal connected to the control end of the first current control module and the control end of the second current control module, and the control signal connected to the control end of the first current control module is different from the control signal connected to the control end of the second current control module; The driving method of the pixel circuit comprises: In the light-emitting stage, the light-emitting control module is controlled to drive the light-emitting module to emit light according to the potential of the first node, and the first current control module and the second current control module are controlled to control the potential of the first node simultaneously according to the control signal connected to their own control ends, so as to control the light-emitting time of the light-emitting module.

9. The driving method of the pixel circuit according to claim 8, characterized in that: The first current control module includes a first driving unit and a first voltage writing unit, the first driving unit is connected between a third power line and the first node, the first voltage writing unit is connected between a first control signal line and the first driving unit, and a control end of the first voltage writing unit is connected to a first scan line; the second current control module includes a second driving unit and a second voltage writing unit, the second driving unit is connected between a fourth power line and the first node, the second voltage writing unit is connected between a second control signal line and the second driving unit, and a control end of the second voltage writing unit is connected to a second scan line; The driving method of the pixel circuit further includes: In the second voltage writing stage, controlling the second voltage writing unit to respond to the second scanning signal on the second scanning line and transmitting the second control signal on the second control signal line to the control end of the second driving unit; In the first voltage writing stage, controlling the first voltage writing unit to respond to the first scanning signal on the first scanning line and transmitting the first control signal on the first control signal line to the control end of the first driving unit; Alternatively, the first current control module includes a first driving unit, a first compensation unit and a first light-emitting control unit, the first driving unit is connected between the third power line and the first node, the control end of the first compensation unit is connected to the first scan line, the first end of the first compensation unit is connected to the first end of the first driving unit, the second end of the first compensation unit is connected to the control end of the first driving unit, the control end of the first light-emitting control unit is connected to the first light-emitting control signal line, the first end of the first light-emitting control unit is connected to the third power line, the second end of the first light-emitting control unit is connected to the first end of the first driving unit, and the second end of the first driving unit is connected to the first node; the second current control module includes a second driving unit, a second voltage writing unit, a second compensation unit, a third light-emitting control unit and a fourth a light-emitting control unit, wherein the second driving unit is connected between a fourth power line and the first node, the second voltage writing unit is connected between the first control signal line and the first end of the second driving unit, the control end of the second voltage writing unit is connected to the third scan line, the control end of the second compensation unit is connected to the second scan line, the first end of the second compensation unit is connected to the second end of the second driving unit, the second end of the second compensation unit is connected to the control end of the second driving unit, the control end of the third light-emitting control unit is connected to the second light-emitting control signal line, the control end of the fourth light-emitting control unit is connected to the third light-emitting control signal line, the third light-emitting control unit is connected between the fourth power line and the second end of the first driving unit, and the fourth light-emitting control unit is connected between the first end of the first driving unit and the first node; The driving method of the pixel circuit further includes: In the second voltage writing stage, controlling the second voltage writing unit to respond to the third scanning signal on the third scanning line, transmitting the second control signal on the first control signal line to the control end of the second driving unit via the second compensation unit; In the first voltage writing stage, controlling the second voltage writing unit to transmit the first control signal on the first control signal line to the control end of the first driving unit via the fourth light emitting control unit and the first compensation unit in response to the third scanning signal; Preferably, in the light-emitting stage, the steps of controlling the light-emitting control module to drive the light-emitting module to emit light according to the potential of the first node, and controlling the first current control module and the second current control module to control the potential of the first node simultaneously according to the control signal connected to their own control ends, so as to control the light-emitting time of the light-emitting module include: In the light-emitting stage, the first driving unit is controlled to control the potential of the first node according to the first control signal and the second driving unit is controlled to control the potential of the first node according to the second control signal at the same time, so as to control the light-emitting control module to drive the light-emitting module to emit light according to the potential of the first node, and the potential of the first node is adjusted by the first control signal and the second control signal to control the light-emitting time of the light-emitting module.

10. A display panel, characterized in that: Comprising the pixel circuit as described in any one of claims 1-7.

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