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 time control module, a current control module, a light emitting module and a temperature control module, the time control module is used for controlling the potential of the control end of the current control module according to a time data signal and a sweep frequency signal; the light-emitting time of the light-emitting module is controlled; the temperature control module is connected with the control end of the current control module, and in the light emitting process, the temperature control module controls the potential of the control end of the current control module according to the temperature of the light emitting module so as to control the current control module to be switched off when the temperature of the light emitting module exceeds the preset temperature. Therefore, the working temperature of the light-emitting module can be controlled within a certain range, and the situation that the light-emitting efficiency is affected or the light-emitting module is damaged due to the fact that the temperature of the light-emitting module is too high is prevented.

Description

Technical Field

[0001] The embodiments of the present invention relate 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, people have higher and higher requirements on the display quality of display devices.

[0003] In the existing driving method, the light-emitting element has low light-emitting efficiency and unstable light-emitting, resulting in poor display quality. Summary of the invention

[0004] The embodiment of the present invention provides a pixel circuit and a driving method thereof and a display panel to improve display quality.

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

[0006] The current control module and the light-emitting module are connected between a first power line and a second power line, and the current control module is used to control the on-off state of the connection path between the first power line and the second power line to control the light-emitting module to emit light;

[0007] The time control module is used to control the potential of the control end of the current control module according to the time data signal and the sweep frequency signal, so as to control the light-emitting time of the light-emitting module;

[0008] The temperature control module is connected to the control end of the current control module, and is used to control the potential of the control end of the current control module according to the temperature of the light-emitting module, and control the current control module to shut down when the temperature of the light-emitting module exceeds a preset temperature.

[0009] Optionally, the temperature control module includes a first control unit and a second control unit; the first control end of the first control unit is connected to the first potential control signal line, and the second control end is connected to the reference voltage signal line, and the first control unit is used to control the potential of its own output end based on the temperature of the light-emitting module, according to the first potential control signal on the first potential control signal line and the reference voltage on the reference voltage signal line;

[0010] The first control end of the second control unit is connected to the second potential control signal line, and the second control end is connected to the output end of the first control unit. The second control unit is used to control the potential of the control end of the current control module according to the potential of the output end of the first control unit and the second potential control signal on the second potential control signal line.

[0011] Optionally, the first control unit includes a first transistor and a triode, the gate of the first transistor is connected to the first potential control signal line, the first electrode of the first transistor is connected to the third power line, the second electrode of the first transistor and the first electrode of the triode are connected to the output end of the first control unit, the base of the triode is connected to the reference voltage signal line, and the second electrode of the triode is connected to the second power line;

[0012] The second control unit includes a second transistor and a third transistor, the gate of the second transistor is connected to the second potential control signal line, the first electrode of the second transistor is connected to the third power line, the second electrode of the second transistor and the first electrode of the third transistor are connected to the output end of the second control unit, the gate of the third transistor is connected to the first electrode of the triode, and the second electrode of the third transistor is connected to the second power line;

[0013] Optionally, the channel type of the first transistor is the same as the channel type of the second transistor, and the first potential control signal and the second potential control signal are inverted signals to each other;

[0014] Optionally, a channel type of the first transistor is opposite to a channel type of the second transistor, and the first potential control signal line is multiplexed as the second potential control signal line.

[0015] Optionally, the temperature control module further includes a feedback unit, the feedback unit is connected between the third power line and the second control end of the second control unit, and the feedback unit is used to control the potential of the second control end of the second control unit according to the potential of the control end of the current control module;

[0016] Optionally, the feedback unit includes a fourth transistor and a fifth transistor, the gate of the fourth transistor is connected to the first potential 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 fifth transistor, the second electrode of the fifth transistor is connected to the second control end of the second control unit, and the gate of the fifth transistor is connected to the control end of the current control module.

[0017] Optionally, the temperature control module further includes a potential switching unit, the potential switching unit is connected between the output end of the second control unit and the control end of the current control module, and the potential switching unit is used to switch the potential of the output end of the second control unit to a potential matched by the control end of the current control module;

[0018] Optionally, the potential switching unit includes at least one first inverter;

[0019] Optionally, the temperature control module further includes a first voltage stabilizing unit, and the first voltage stabilizing unit is connected between the output end of the second control unit and the second power line;

[0020] Optionally, the first voltage stabilizing unit includes a first capacitor.

[0021] Optionally, it further comprises a voltage optimization module, the voltage optimization module is connected between the output end of the time control module and the control end of the current control module, the voltage optimization module is used to keep the control end of the current control module at a shutdown voltage according to the potential of the output end of the time control module when the light emission ends;

[0022] Optionally, the voltage optimization module includes a second inverter and a third inverter connected in series, the input end of the second inverter is connected to the output end of the time control module, and the output end of the third inverter is connected to the control end of the current control module;

[0023] Optionally, the voltage optimization module further includes a second voltage stabilizing unit, and the second voltage stabilizing unit is connected to the control end of the current control module;

[0024] Optionally, the voltage optimization module further includes a reset unit, a control end of the reset unit is connected to a reset signal line, and the reset unit is connected between the first initialization signal line and the control end of the current control module.

[0025] Optionally, the current control module includes a first current control unit, a control end of the first current control unit serves as the control end of the current control module, and the first current control unit and the light-emitting module are connected between the first power line and the second power line; or

[0026] The current control module includes a first current control unit and a second control unit, the control end of the current control module includes a first control end and a second control end, the control end of the first current control unit serves as the first control end of the current control module, the control end of the second current control unit serves as the second control end of the current control module, and the first current control unit, the second current control unit and the light emitting module are connected between the first power line and the second power line;

[0027] Optionally, the current control module further includes a first driving unit, a first data writing unit and a first storage unit, wherein the first driving unit is connected between the first power line and the first end of the first current control unit, the first data writing unit is connected to the first driving unit, the first data writing unit is used to write the current data signal to the control end of the first driving unit, and the first storage unit is connected between the first power line and the control end of the first driving unit;

[0028] Optionally, the current control module further includes a first compensation unit, the first compensation unit is connected between the first end and the control end of the first driving unit, and the control end of the first compensation unit and the control end of the first data writing unit are both connected to the first scan line;

[0029] Optionally, the current control module further includes a first initialization unit and a second initialization unit, the control end of the first initialization unit is connected to the second scan line, the first end of the first initialization unit is connected to the first initialization signal line, and the second end is connected to the control end of the first driving unit; the control end of the second initialization unit is connected to the second scan line, the second initialization unit is connected between the second initialization signal line and the first end of the light emitting module, and the second end of the light emitting module is connected to the second power line;

[0030] Optionally, the current control module also includes a first light-emitting control unit and a second light-emitting control unit, the control end of the first light-emitting control unit is connected to the first light-emitting control signal line, the first light-emitting control unit is connected between the second end of the first current control unit and the first end of the light-emitting module, or the first light-emitting control unit and the second current control unit are connected in series between the second end of the first current control unit and the first end of the light-emitting module; the second light-emitting control unit is connected between the first power line and the first end of the first driving unit, and the control end of the second light-emitting control unit is connected to the second light-emitting control signal line.

[0031] Optionally, the time control module includes a second driving unit, a second data writing unit, a third initialization unit, a coupling unit and a second storage unit;

[0032] The second driving unit is connected between the third power line and the output end of the time control module, and the second data writing unit is used to write the time data signal to the control end of the second driving unit; the third initialization unit is connected between the third initialization signal line and the control end of the second driving unit, and the control end of the third initialization unit is connected to the third scanning line; the coupling unit is connected to the control end of the second driving unit, and the coupling unit is used to control the potential of the control end of the second driving unit according to the frequency sweep signal, and the second storage unit is connected between the third power line and the control end of the second driving unit;

[0033] Optionally, the time control module further includes a second compensation unit, the second compensation unit is connected between the control end and the second end of the second driving unit, and the control end of the second compensation unit and the control end of the second data writing unit are both connected to the fourth scan line;

[0034] Optionally, the time control module further includes a third light-emitting control unit and a fourth light-emitting control unit, 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 third power line, the second end of the third light-emitting control unit is connected to the first end of the second driving unit, the first end of the fourth light-emitting control unit is connected to the second end of the second driving unit, and the second end of the fourth light-emitting control unit is connected to the output end of the time control module;

[0035] Optionally, the time control module further includes a fourth initialization unit, a control end of the fourth initialization unit is connected to the third scan line, and the fourth initialization unit is connected between a fourth initialization signal line and an output end of the time control module.

[0036] According to another aspect of the present invention, a driving method of a pixel circuit is provided, wherein the pixel circuit comprises a time control module, a current control module, a light emitting module and a temperature control module, wherein the current control module and the light emitting module are connected between a first power line and a second power line, and the temperature control module is connected to a control end of the current control module; the driving method of the pixel circuit comprises:

[0037] In the light-emitting stage, the current control module is controlled to conduct the connection path between the first power line and the second power line to control the light-emitting module to emit light, and the time control module is controlled to control the potential of the control end of the current control module according to the time data signal and the sweep signal to control the light-emitting time of the light-emitting module;

[0038] When the temperature of the light emitting module exceeds a preset temperature, the temperature control module is controlled to turn off the current control module.

[0039] 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.

[0040] The technical solution provided by the embodiment of the present invention is to set a temperature control module at the control end of the current control module. During the light-emitting process, the temperature control module controls the potential of the control end of the current control module according to the temperature of the light-emitting module, so that when the temperature of the light-emitting module exceeds a preset temperature, the current control module is controlled to shut down to cut off the connection path between the first power line and the second power line, so that the light-emitting module stops emitting light, thereby being able to control the operating temperature of the light-emitting module within a certain range, preventing the light-emitting module from affecting the light-emitting efficiency or being damaged due to excessively high temperature.

[0041] 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

[0042] 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.

[0043] Figure 1 A schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0044] Figure 2 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0045] Figure 3 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0046] Figure 4 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0047] Figure 5 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0048] Figure 6 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0049] Figure 7A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0050] Figure 8 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0051] Fig. 9 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0052] Fig.10 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0053] Fig.11 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0054] Fig.12 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0055] Fig.13 A schematic diagram of the structure of a current control module provided by an embodiment of the present invention;

[0056] Fig.14 A schematic diagram of the structure of a time control module provided by an embodiment of the present invention;

[0057] Fig.15 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0058] Fig.16 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0059] Fig.17 A schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0060] Fig.18 A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0061] Fig.19 A schematic structural diagram of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0062] 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.

[0063] 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.

[0064] Figure 1 A schematic diagram of a pixel circuit according to an embodiment of the present invention is provided. Figure 1 The pixel circuit provided in this embodiment includes a time control module 10, a current control module 20, a light-emitting module 30 and a temperature control module 40. The current control module 20 and the light-emitting module 30 are connected between the first power line L1 and the second power line L2. The current control module 20 is used to control the on-off state of the connection path between the first power line L1 and the second power line L2 to control the light-emitting module 30 to emit light.

[0065] The time control module 10 is used to control the potential of the control terminal G1 of the current control module 20 according to the time data signal Vdata_t and the sweep signal SWEEP, so as to control the light emitting time of the light emitting module 30 .

[0066] The temperature control module 40 is connected to the control terminal G1 of the current control module 20 and is used to control the potential of the control terminal G1 of the current control module 20 according to the temperature of the light emitting module 30 and control the current control module 20 to shut down when the temperature of the light emitting module 30 exceeds a preset temperature.

[0067] Specifically, the first power line L1 is used to provide a first power supply voltage VDDA, and the second power line L2 is used to provide a second power supply voltage VSS. When the current control module 20 is turned on, the connection path between the first power line L1 and the second power line L2 is turned on, and the light-emitting module 30 emits light. When the light emission ends, the time control module 10 controls the potential of the control terminal G1 of the current control module 20 according to the time data signal Vdata_t and the sweep signal SWEEP, so that the current control module 20 is turned off, the connection path between the first power line L1 and the second power line L2 is cut off, and the light-emitting module 30 stops emitting light.

[0068] The light emitting module 30 generally includes a light emitting diode. During long-term light emission, the temperature of the light emitting module 30 will rise. If the temperature exceeds the upper limit it can withstand, the light emitting element (eg, light emitting diode) included in the light emitting module 30 may be damaged.

[0069] In the present embodiment, the temperature control module 40 can adjust the potential of the control terminal G1 of the current control module 20 according to the temperature of the light-emitting module 30. When the temperature of the light-emitting module 30 exceeds the preset temperature, the voltage of the control terminal G1 of the current control module 20 is controlled to be a shutdown voltage to shut down the current control module 20 so that the light-emitting module 30 stops emitting light, thereby controlling the light-emitting module 30 to operate within a certain temperature range to prevent the temperature of the light-emitting module 30 from being too high, resulting in a reduction in the light-emitting efficiency and a brightness attenuation problem, or damage to the light-emitting module 30.

[0070] It should be noted that, during the period when the light-emitting module 30 emits light, the temperature control module 40 is adjustable in controlling the potential of the control terminal G1 of the current control module 20 according to the temperature of the light-emitting module 30. That is, at different temperatures, the temperature control module 40 has different degrees of adjustment of the potential of the control terminal G1 of the current control module. Exemplarily, when the preset temperature is the maximum temperature that the light-emitting module 30 can withstand, when the temperature of the light-emitting module 30 is close to the preset temperature, the temperature control module 40 adjusts the potential of the control terminal G1 of the current control module 20 to a smaller extent, so that the current control module 20 can be in a semi-conducting state to reduce the driving current of the light-emitting module 30. When the temperature of the light-emitting module 30 is greater than or equal to the preset temperature, the temperature control module 40 adjusts the potential of the control terminal G1 of the current control module 20 to a greater extent, so that the current control module 20 can be in a completely off state, the driving current of the light-emitting module 30 is cut off, and the light emission stops. Whether reducing the driving current or cutting off the driving current, the temperature of the light-emitting module 30 can be effectively reduced, and the reliability of the light-emitting module 30 can be improved.

[0071] The technical solution provided by the embodiment of the present invention is to set a temperature control module 40 at the control end G1 of the current control module 20. During the light-emitting process, the temperature control module 40 controls the potential of the control end G1 of the current control module 20 according to the temperature of the light-emitting module 30, so that when the temperature of the light-emitting module 30 exceeds a preset temperature, the current control module is controlled to shut down to cut off the connection path between the first power line and the second power line, so that the light-emitting module 30 stops emitting light, thereby being able to control the operating temperature of the light-emitting module 30 within a certain range, thereby preventing the light-emitting module 30 from affecting the light-emitting efficiency or being damaged due to excessively high temperature.

[0072] Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2On the basis of the above technical solution, optionally, the temperature control module 40 includes a first control unit 401 and a second control unit 402. The first control terminal of the first control unit 401 is connected to the first potential control signal line to receive the first potential control signal VB1 transmitted by the first potential control signal line, and the second control terminal is connected to the reference voltage signal line to receive the reference voltage Vref transmitted by the reference voltage signal line. The first control unit 401 is used to control the potential of its own output terminal according to the first potential control signal VB1 on the first potential control signal line and the reference voltage Vref on the reference voltage signal line based on the temperature of the light-emitting module 401.

[0073] The first control end of the second control unit 402 is connected to the second potential control signal line to receive the second potential control signal VB2 transmitted on the second potential control signal line, and the second control end is connected to the output end of the first control unit 401. Here, the output end of the second control unit 402 is connected to the output end of the temperature control module 40, and the second control unit 402 is used to control the potential of the control end G1 of the current control module 20 according to the potential of the output end of the first control unit 401 and the second potential control signal VB2 on the second potential control signal line.

[0074] The first control unit 401 can change its own state in response to the temperature of the light emitting module 30, thereby changing the potential of its own output terminal, and then changing the output state of the second control unit 402, that is, changing the potential of the control terminal G1 of the current control module 20. Exemplarily, the first control unit 401 can adjust its own impedance or node voltage according to the temperature of the light emitting module 30, thereby changing the potential of the output terminal.

[0075] 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, specifically, the first control unit 401 includes a first transistor M1 and a triode Q1, the gate of the first transistor M1 is connected to the first potential control signal line, the first electrode of the first transistor M1 is connected to the third power line L3, the second electrode of the first transistor M1 and the first electrode of the triode Q1 are connected to the output end of the first control unit 401, the base of the triode Q1 is connected to the reference voltage signal line, and the second electrode of the triode Q1 is connected to the second power line L2.

[0076] The second control unit 402 includes a second transistor M2 and a third transistor M3, the gate of the second transistor M2 is connected to the second potential control signal line, the first electrode of the second transistor M2 is connected to the third power line L3, the second electrode of the second transistor M2 and the first electrode of the third transistor M3 are connected to the output end of the second control unit 402, the gate of the third transistor M3 is connected to the first electrode of the transistor Q1, and the second electrode of the third transistor M3 is connected to the second power line L2.

[0077] Among them, the conduction voltage between the base and the second electrode (emitter) of the transistor Q1 decreases as the temperature increases. In the normal light-emitting stage, the transistor Q1 is in the off state, the first transistor M1 is turned on in response to the first potential control signal VB1 on the first potential control signal line, and the third power supply voltage VDDW on the third power supply line L3 is transmitted to the output end of the first control unit 401 through the first transistor M1. The output end of the first control unit 401 is at a high potential, and the third transistor M3 is turned off. The second transistor M2 is turned on in response to the second potential control signal VB2 on the second potential control signal line, and the third power supply voltage VDDW is transmitted to the output end of the second control unit 402, so that the control current control module 20 is turned on, and the light-emitting module 30 emits light.

[0078] As the light emission proceeds, the temperature of the light emitting module 30 gradually increases, so the voltage between the base and the second electrode of the transistor Q1 gradually decreases. By setting the value of the reference voltage Vref transmitted on the reference voltage signal line, the transistor Q1 can be turned on when the temperature of the light emitting module 20 exceeds the preset temperature, thereby pulling the potential of the output end of the first control unit 401 down to the second power supply voltage VSS. At this time, the first transistor M1 is turned off in response to the first potential control signal VB1. The third transistor M3 is turned on in response to the low potential of the output end of the first control unit 401, and pulls down the potential of the output end of the second control unit 402, thereby controlling the current control module 20 to turn off, and the light emitting module 30 stops emitting light, to prevent the light emitting module 30 from being damaged by excessive temperature.

[0079] It should be understood that Figure 3 In the pixel circuit shown, the current control module 20 is turned on in response to a high level and turned off in response to a low level. The channel type of the second transistor M2 is opposite to the channel type of the third transistor M3, the channel type of the second transistor M2 is opposite to the channel type of the first transistor M1, and the first potential control signal VB1 is the same as the second potential control signal VB2.

[0080] Figure 4 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention, Figure 4 The pixel circuit and Figure 3 The difference between the pixel circuits shown is that Figure 4In the embodiment, the channel types of the second transistor M2 and the third transistor M3 are the same, both of which are N-type transistors. Here, the current control module 20 can be turned on in response to a low level. Exemplarily, in the normal light-emitting stage, the transistor Q1 is in an off state, the first transistor M1 is turned on in response to the first potential control signal VB1 on the first potential control signal line, and the third power supply voltage VDDW on the third power supply line L3 is transmitted to the output end of the first control unit 401 through the first transistor M1. The output end of the first control unit 401 is a high potential, and the third transistor M3 is turned on. The second transistor M2 is turned off in response to the first potential control signal VB1 on the first potential control signal line (wherein the first potential control signal line can be reused as the second potential control signal line to save the number of signal lines), and the third transistor M3 transmits the second power supply voltage VSS to the output end of the second control unit 402, and the current control module 20 is turned on from the control, and the light-emitting module 30 emits light.

[0081] As the light emission proceeds, the temperature of the light emitting module 30 gradually increases, so the voltage between the base and the second electrode of the transistor Q1 gradually decreases. When the temperature of the light emitting module 20 increases to make the transistor Q1 conduct, the transistor Q1 pulls down the potential of the output end of the first control unit 401 to the second power supply voltage VSS. At this time, the first transistor M1 is turned off in response to the first potential control signal VB1, and the second transistor M2 is turned on in response to the first potential control signal VB1 or the second potential control signal VB2. The third transistor M3 is turned off in response to the low potential of the output end of the first control unit 401, so the potential of the output end of the second control unit 402 is pulled up to the third power supply voltage VDDW by the second transistor M1, thereby controlling the current control module 20 to turn off, and the light emitting module 30 stops emitting light, to prevent the light emitting module 30 from being damaged by excessive temperature.

[0082] In the above technical solutions, the reference voltage Vref can be set according to actual needs. For example, if the operating temperature range of the light emitting module 30 is required to be larger, the reference voltage Vref can be set to be larger to increase the voltage difference between the base and the second electrode of the transistor Q1. Optionally, the reference voltage Vref is a voltage greater than the second power supply voltage VSS.

[0083] Figure 5 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 5On the basis of the above technical solutions, optionally, the temperature control module 40 further includes a potential switching unit 404, which is connected between the output terminal of the second control unit 402 and the control terminal G1 of the current control module 20, and is used to switch the potential of the output terminal of the second control unit 402 to the potential matched by the control terminal G1 of the current control module 20. By setting the potential switching unit 404, the channel type of each transistor in the second control unit 402 and the current control module 20 can be flexibly set.

[0084] The potential switching unit 404 includes at least one first inverter, and the number of the first inverters can be set according to the potential required by the control terminal G1 of the current control module 20 .

[0085] Continue to refer Figure 5 The temperature control module 40 further includes a first voltage stabilizing unit 405 , which is connected between the output end of the second control unit 402 and the second power line L2 , and is used to stabilize the potential of the output end of the second control unit 402 .

[0086] Figure 6 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 6 On the basis of the above technical solution, optionally, the temperature control module 40 also includes a feedback unit 403, which is connected between the third power line and the second control end of the second control unit 402. The feedback unit 403 is used to control the potential of the second control end of the second control unit 402 according to the potential of the control end G1 of the current control module 20 to ensure the accuracy of the potential of the second control end of the second control unit 402 and improve the control accuracy of the temperature of the light-emitting module 30.

[0087] Specifically, Figure 7 A schematic diagram of another pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 7 As shown, the feedback unit 403 includes a fourth transistor M4 and a fifth transistor M5, the gate of the fourth transistor M4 is connected to the first potential 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 fifth transistor M5, the second electrode of the fifth transistor M5 is connected to the second control end of the second control unit 402, and the gate of the fifth transistor M5 is connected to the control end G1 of the current control module 20.

[0088] Taking the second control unit 402 including the second transistor M2 and the third transistor M3 as N-type transistors, the gate of the third transistor M3 is used as the second control terminal of the second control unit 402, and the gate of the second transistor M2 is used as the first control terminal of the second control unit 402. Among them, the fifth transistor M5 is an N-type transistor. The current control module 20 is turned on in response to the high potential of its control terminal G1. In the normal light-emitting stage, the triode Q1 is in the off state, the first transistor M1 and the fourth transistor M4 are turned on in response to the first potential control signal VB1 on the first potential control signal line, and the third power supply voltage VDDW on the third power supply line L3 is transmitted to the output terminal of the first control unit 401 through the first transistor M1. The output terminal of the first control unit 401 is at a high potential, and the third transistor M3 is turned on. The second transistor M2 is turned off in response to the first potential control signal VB1 on the first potential control signal line, and the third transistor M3 transmits the second power supply voltage VSS to the output terminal of the second control unit 402. The output terminal of the first inverter I1 is at a high level, and the current control module 20 is turned on from the control, and the light-emitting module 30 emits light. In addition, the fifth transistor M5 is turned on in response to the potential of the control terminal G1 of the current control module 20, and transmits the third power supply voltage VDDW to the gate of the third transistor M3, ensuring that the third transistor M3 is continuously turned on, which is beneficial to enhancing the potential stability of the gate of the third transistor M3.

[0089] When the temperature of the light emitting module 30 exceeds the preset temperature, the transistor Q1 is turned on so that the third transistor M3 is turned off, and the output terminal of the second control unit 402 outputs a high potential. After the inversion action of the first inverter I1, the potential of the control terminal G1 of the current control module 20 is low, the current control module 20 is turned off, and the light emitting module 30 stops emitting light. In addition, the fifth transistor M5 is turned off in response to the low potential of the control terminal G1 of the current control module 20, and the third transistor M3 remains in the off state.

[0090] Figure 8 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 8 Based on the above technical solutions, optionally, the current control module 20 includes a first current control unit 201, the control end of the first current control unit 201 serves as the control end G1 of the current control module 20, and the first current control unit 201 and the light-emitting module 30 are connected between the first power line L1 and the second power line L2.

[0091] Optionally, the output end of the time control module 10 and the output end of the temperature control module 40 may also be connected to different control ends of the current control module 20 respectively to prevent different potentials from interfering with the same control end of the current control module 20 . Fig. 9 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig. 9The current control module 20 includes a first current control unit 201 and a second control unit 202. The control end of the current control module 20 includes a first control end G1-1 and a second control end G1-2. The control end of the first current control unit 201 serves as the first control end G1-1 of the current control module 20. The control end of the second current control unit 202 serves as the second control end G1-2 of the current control module 20. The first current control unit 201, the second current control unit 202 and the light-emitting module 30 are connected between the first power line L1 and the second power line L2.

[0092] As a preferred implementation provided by this embodiment, the pixel circuit provided by this embodiment will be described below by taking the current control module 20 including the first current control unit 201 and the second current control unit 201 as an example.

[0093] Fig.10 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.10 On the basis of the above technical solutions, optionally, the pixel circuit also includes a voltage optimization module 50, which is connected between the output end of the time control module 10 and the control end G1 of the current control module 20 (specifically, the first control end G1-1 of the current control module 20). The voltage optimization module 50 is used to keep the control end G1 of the current control module 20 at the off voltage according to the potential of the output end of the time control module 10 when the light emission ends.

[0094] Specifically, the first power line L1 is used to provide a first power supply voltage VDDA, and the second power line L2 is used to provide a second power supply voltage VSS. The current control module 20 can generate a driving current when the connection path between the first power line L1 and the second power line L2 is turned on, and drive the light-emitting module 30 to emit light. The time control module 10 outputs a time control signal according to the time data signal Vdata_t and the sweep signal SWEEP to control the potential of the control end of the current control module 20, specifically the potential of the control end of the first current control unit 201, so as to control the light-emitting time of the light-emitting module 30.

[0095] The voltage optimization module 50 is connected between the output terminal of the time control module 10 and the control terminal G1 of the current control module 20, so that the time control module 10 and the current control module 20 are not directly connected, that is, the time control signal output by the time control module 10 does not directly control the potential of the first control terminal G1-1 of the current control module 20. Therefore, even if the time control signal of the time control module 10 is unstable due to its own leakage, the voltage optimization module 50 can still stabilize the potential of the first control terminal G1-1 of the current control module 20 at the shutdown voltage (for example, the shutdown voltage can be the third power supply voltage VDDW; in other embodiments, the shutdown voltage can be any voltage that can shut down the current control module 20), preventing the potential of the first control terminal G1-1 of the current control module 20 from attenuating and other unstable problems, thereby ensuring that the current control module 20 can be quickly shut down at the end of light emission, reducing the driving current attenuation phenomenon caused by the unstable potential of the control terminal of the current control module 20, improving the difference in driving current between different pixels, improving the uniformity of the driving current, effectively avoiding the difference in light emission time between different pixels, and being conducive to improving the display effect.

[0096] Fig.11 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.11 On the basis of the above technical solution, optionally, the voltage optimization module 50 includes a second inverter I2 and a third inverter I3 connected in series, the input end of the second inverter I2 is connected to the output end of the time control module 10, and the output end of the third inverter I3 is connected to the control end of the current control module 201 (specifically, the first control end G1-1 of the current control module 20). By setting the second inverter I2 and the third inverter I3, the control end of the first current control unit 20 is quickly pulled up to the shutdown voltage under the premise of ensuring that the voltage optimization module 50 does not change the polarity of the time control signal output by the time control module 10, so that the current control module 20 is quickly shut down.

[0097] Fig.12 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.12 On the basis of the above technical solution, optionally, the voltage optimization module 50 further includes a second voltage stabilizing unit 501, which is connected to the first control terminal G1-1 of the current control module 20 and is used to stabilize the potential of the first control terminal G1-1 of the current control module 20.

[0098] Optionally, the voltage optimization module 50 further includes a reset unit 502, the control end of the reset unit 502 is connected to the reset signal line, and the reset unit 502 is connected between the first initialization signal line and the first control end G1-1 of the current control module 201. The reset unit 502 is used to respond to the reset signal Set transmitted on the reset signal line before the light-emitting stage, and transmit the first initialization voltage Vinit1 on the first initialization signal line to the first control end G1-1 of the current control module 201 to initialize the potential of the control end of the first current control unit 201.

[0099] It should be understood that when the current control module 20 only includes the first current control unit 201 , the current control module 20 only includes the first control terminal G1 - 1 , and the control terminal of the current control module 20 (ie, the first control terminal G1 - 1 ) is the control terminal of the first current control unit 201 .

[0100] The technical solution provided in this embodiment can be applied to a pixel circuit with digital-analog hybrid drive. Fig.13 A schematic diagram of a current control module according to an embodiment of the present invention is provided. Fig.13 On the basis of the above technical solutions, optionally, the current control module 20 further includes a first driving unit 203, a first data writing unit 204 and a first storage unit 205, the first driving unit 203 is connected between the first power line L1 and the first end of the first current control unit 201, the first data writing unit 204 is connected to the first driving unit 203, the first data writing unit 204 is used to write the current data signal Vdata_I to the control end of the first driving unit 203, and the first storage unit 205 is connected between the first power line L1 and the control end of the first driving unit 203.

[0101] Optionally, the current control module 20 further includes a first compensation unit 206, which is connected between the first end and the control end of the first driving unit 203, and the control end of the first compensation unit 206 and the control end of the first data writing unit 204 are both connected to the first scan line, and are used to respond to the first scan signal S1 transmitted on the first scan line. The first compensation unit 206 is used to compensate for the threshold voltage of the first driving unit 203, so as to improve the problem of poor uniformity of the driving current caused by the change of the threshold characteristic of the first driving unit 203.

[0102] Optionally, the current control module 20 also includes a first light-emitting control unit 209 and a second light-emitting control unit 210, the control end of the first light-emitting control unit 209 is connected to the first light-emitting control signal line, and the first light-emitting control unit 209 and the second current control unit 202 are connected in series between the second end of the first current control unit 201 and the first end of the light-emitting module 30; the second light-emitting control unit 210 is connected between the first power line L1 and the first end of the first driving unit 203, and the control end of the second light-emitting control unit 210 is connected to the second light-emitting control signal line.

[0103] When the current control module 20 does not include the second current control unit 202 , the first light emitting control unit 209 is connected between the second end of the first current control unit 201 and the first end of the light emitting module 30 .

[0104] In this embodiment, the second light-emitting control unit 210 is used to cut off the connection between the first power line L1 and the first driving unit 203 in the non-light-emitting stage, so as to prevent the first power supply voltage VDDA from interfering with the current data signal Vdata_I when the current data signal Vdata_I is transmitted to the first end of the first driving unit 203, thereby affecting the light-emitting quality.

[0105] Continue to refer Fig.13 The current control module 20 also includes a first initialization unit 207 and a second initialization unit 208. The control end of the first initialization unit 207 is connected to the second scan line, the first end of the first initialization unit 207 is connected to the first initialization signal line, and the second end is connected to the control end of the first driving unit 203; the control end of the second initialization unit 208 is connected to the second scan line, the second initialization unit 208 is connected between the second initialization signal line and the first end of the light-emitting module 30, and the second end of the light-emitting module 30 is connected to the second power line L2.

[0106] Fig.14 A schematic diagram of a time control module provided by an embodiment of the present invention, referring to Fig.14On the basis of the above technical solutions, optionally, the time control module 10 includes a second driving unit 101, a second data writing unit 102, a third initialization unit 103, a coupling unit 104 and a second storage unit 109, the second driving unit 101 is connected between the third power line L3 and the output end of the time control module 10, the second data writing unit 102 is used to write the time data signal Vdata_t to the control end of the second driving unit 101; the third initialization unit 103 is connected between the third initialization signal line and the control end of the second driving unit 101, and the control end of the third initialization unit 103 is connected to the third scan line to respond to the third scan signal S3 on the third scan line. The second storage unit 109 is connected between the third power line L3 and the control end of the second driving unit 101, and is used to store the potential of the control end of the second driving unit 101.

[0107] The coupling unit 104 is connected to the control end of the second driving unit 101 , and the coupling unit 104 is used to control the potential of the control end of the second driving unit 101 according to the sweep signal SWEEP.

[0108] Exemplarily, before the light-emitting stage, the third initialization unit 103 transmits the third initialization voltage Vinit3 on the third initialization signal line to the control end of the second driving unit 101 in response to the third scanning signal S3 on the third scanning line, and initializes the control end of the second driving unit 101. Afterwards, the time data signal Vdata_t is transmitted to the control end of the second driving unit 101 via the second data writing unit 102, and a constant voltage difference is maintained across the coupling unit 104. In the light-emitting stage, the current control module 20 can generate a driving current according to the voltage state of its control end to drive the light-emitting module 30 to emit light. Among them, the sweep signal SWEEP is used to perform signal scanning from a high level to a low level, or from a low level to a high level in the light-emitting stage, so as to control the voltage at the output end of the time control module 10, thereby controlling the voltage at the control end of the current control module 20, and then controlling the working state (on or off) of the current control module 20, and realizing the control of the light-emitting time of the light-emitting module 30.

[0109] Optionally, the time control module 10 also includes a second compensation unit 105, which is connected between the control end and the second end of the second driving unit 101. The control end of the second compensation unit 105 and the control end of the second data writing unit 102 are both connected to the fourth scan line to respond to the fourth scan signal S4 on the fourth scan line.

[0110] The time control module 10 also includes a third light-emitting control unit 106 and a fourth light-emitting control unit 107, the control end of the third light-emitting control unit 106 and the control end of the fourth light-emitting control unit 107 are both connected to the second light-emitting control signal line, the first end of the third light-emitting control unit 106 is connected to the third power line L3, the second end of the third light-emitting control unit 106 is connected to the first end of the second driving unit 101, the first end of the fourth light-emitting control unit 107 is connected to the second end of the second driving unit 101, and the second end of the fourth light-emitting control unit 107 is connected to the output end of the time control module 10.

[0111] Optionally, the time control module 10 also includes a fourth initialization unit 108, the control end of the fourth initialization unit 108 is connected to the third scan line, and the fourth initialization unit 108 is connected between the fourth initialization signal line and the output end of the time control module 10, for initializing the output end of the time control module.

[0112] Fig.15 A structural diagram of another pixel circuit provided by an embodiment of the present invention is specifically a structural diagram of a pixel circuit refined into a device. In which, the first current control unit 201 includes a sixth transistor M6, the second current control unit 202 includes a seventh transistor M7, the first driving unit 203 includes an eighth transistor M8, the first data writing unit 204 includes a ninth transistor M9, the first compensation unit 206 includes a tenth transistor M10, the second light-emitting control unit 210 includes an eleventh transistor M11, the first light-emitting control unit 209 includes a twelfth transistor M12, the first initialization unit 207 includes a thirteenth transistor M13, the second initialization unit 208 includes a fourteenth transistor M14, the second driving unit 101 includes a fifteenth transistor M15, the second data writing unit 102 includes a sixteenth transistor M16, the second compensation unit 105 includes a seventeenth transistor M17, the third initialization unit 103 includes an eighteenth transistor M18, the third light-emitting control unit 106 includes a nineteenth transistor M19, the fourth light-emitting control unit 107 includes a twentieth transistor M20, and the fourth initialization unit 108 includes a twenty-first transistor M21.

[0113] The coupling unit 104 includes a fourth capacitor C4, the first storage unit 205 includes a third capacitor C3, the second storage unit 109 includes a fifth capacitor, the reset unit 502 includes a twenty-second transistor M22, and the second voltage stabilizing unit 501 includes a second capacitor C2. The light emitting module 30 includes a light emitting diode D1, which can be an LED, an OLED, a Micro LED or a Mini LED.

[0114] Fig.16 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention can be applied to Fig.15 Assume that the second transistor M2, the third transistor M3, the fifth transistor M5 and the seventh transistor M7 are all N transistors, and the remaining transistors are all P transistors. Fig.16 The working process of the pixel circuit provided in this embodiment includes: a voltage writing stage T1, a reset stage T2 and a light emitting stage T3, wherein the voltage writing stage T1 includes an initialization stage t1, a first data writing stage t2 and a second data writing stage t3.

[0115] In the initialization stage t1, the first scan line is configured to transmit a high-level first scan signal S1, the second scan line is configured to transmit a low-level second scan line S2, the third scan line is configured to transmit a high-level third scan signal S3, the fourth scan line is configured to transmit a high-level fourth scan signal S4, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. Therefore, the thirteenth transistor M13 and the fourteenth transistor M14 are turned on, and the second initialization voltage Vinit2 on the second initialization signal line is transmitted to the gate of the eighth transistor M8 and the first electrode of the light-emitting diode D1, respectively, to initialize the gate of the eighth transistor M8 and the first electrode of the light-emitting diode D1.

[0116] In the first data writing phase t2, the first scan line is configured to transmit a low-level first scan signal S1, the second scan line is configured to transmit a high-level second scan line S2, the third scan line is configured to transmit a low-level third scan signal S3, the fourth scan line is configured to transmit a high-level fourth scan signal S4, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. Therefore, the ninth transistor M9, the tenth transistor M10, the eighteenth transistor M18 and the twenty-first transistor M21 are turned on. The current data signal Vdata_I is written to the gate of the eighth transistor M8 via the ninth transistor M9, the eighth transistor M8 and the tenth transistor M10, and the gate potential of the eighth transistor M8 is Vdata_I+Vth8, and is stored on the third capacitor C3, where Vth8 is the threshold voltage of the eighth transistor M8, and the threshold compensation of the eighth transistor M8 is realized.

[0117] The third initialization voltage Vinit3 transmitted on the third initialization signal line is transmitted to the gate of the fifteenth transistor M15 via the eighteenth transistor M18, thereby initializing the gate potential of the fifteenth transistor M15 and turning on the fifteenth transistor M15. At the same time, the fourth initialization voltage Vinit4 on the fourth initialization signal line is transmitted to the output end of the time control module 10 via the twenty-first transistor M21, thereby initializing the output end of the time control module 10.

[0118] In the second data writing phase t3, the first scan line is configured to transmit a high-level first scan signal S1, the second scan line is configured to transmit a high-level second scan line S2, the third scan line is configured to transmit a high-level third scan signal S3, the fourth scan line is configured to transmit a low-level fourth scan signal S4, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. Therefore, the sixteenth transistor M16 and the seventeenth transistor M17 are turned on, and the time data signal Vdata_t is transmitted to the gate of the fifteenth transistor M15 through the sixteenth transistor M16, the fifteenth transistor M15 and the seventeenth transistor M17, until the gate potential of the fifteenth transistor M15 is Vdata_t+Vth15, and the fifteenth transistor M15 is turned off, wherein Vth15 is the threshold voltage of the fifteenth transistor M15. A constant voltage difference is maintained across the fourth capacitor C4.

[0119] In this embodiment, during the threshold compensation of the fifteenth transistor M15, the twentieth transistor M20 is provided to improve the instability of the gate potential of the fifteenth transistor M15 due to the leakage of the twenty-first transistor M21, which is beneficial to improving the accuracy of the time control signal output by the time control module 10.

[0120] Phase t4 is the time period during which the voltage writing phase T1 is performed row by row for the remaining rows of sub-pixels, so as to complete the data writing of all the pixel rows.

[0121] In the reset phase T2, the first scan line is configured to transmit a high-level first scan signal S1, the second scan line is configured to transmit a high-level second scan line S2, the third scan line is configured to transmit a high-level third scan signal S3, the fourth scan line is configured to transmit a high-level fourth scan signal S4, the reset signal line is configured to transmit a low-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. Therefore, the twenty-second transistor M22 is turned on, and the first initialization voltage Vinit on the first initialization signal line is transmitted to the gate of the sixth transistor M6, and the gate of the sixth transistor M6 is initialized, the second capacitor C2 maintains the gate potential of the sixth transistor M6, and the sixth transistor M6 is turned on.

[0122] In the voltage writing stage T1 and the reset stage T2, the first potential control signal VB1 can be a high level signal to control the seventh transistor M7 to be turned off; the first potential control signal VB1 can also be a low level signal to control the seventh transistor M7 to be turned on. Whether the seventh transistor M7 is turned on or off, it will not affect the normal operation of the pixel circuit.

[0123] In the light-emitting stage T3, the first scan line is configured to transmit a high-level first scan signal S1, the second scan line is configured to transmit a high-level second scan line S2, the third scan line is configured to transmit a high-level third scan signal S3, the fourth scan line is configured to transmit a high-level fourth scan signal S4, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a low-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a low-level second light-emitting control signal EM2. Therefore, the eleventh transistor M11, the twelfth transistor M12, the nineteenth transistor M19, and the twentieth transistor M20 are turned on, and the first transistor M1 and the fourth transistor M4 are turned on in response to the first potential control signal VB1, respectively, the second transistor M2 is turned off in response to the first potential control signal VB1, and the transistor Q1 is in the off state. The third transistor M3 is turned on in response to the third power supply voltage VDDW output by the first transistor M1, and the first inverter I1 outputs a high level, so the seventh transistor M7 and the fifth transistor M5 are turned on, and the third power supply voltage VDDW is transmitted to the gate of the third transistor M3 via the fourth transistor M4 and the fifth transistor M5, and the third transistor M3 remains turned on.

[0124] The first power supply voltage VDDA on the first power supply line L1 is transmitted to the first electrode of the eighth transistor M8. The eighth transistor M8 generates a driving current under the control of its gate voltage to drive the light emitting diode D1 to emit light.

[0125] During the light-emitting process, the sweep signal SWEEP gradually changes from a high level SWEEP-H to a low level SWEEP-L, and due to the coupling effect of the fourth capacitor C4, the potential of the gate of the fifteenth transistor M15 changes synchronously. When the potential of the gate of the fifteenth transistor M15 turns on the fifteenth transistor M15, the third power supply voltage VDDW is transmitted to the input end of the voltage optimization module 50 through the nineteenth transistor M19, the fifteenth transistor M15 and the twentieth transistor M20. After the inversion effect of the second inverter I2 and the third inverter I3, the voltage optimization module 50 outputs a high level, thereby maintaining the gate potential of the sixth transistor M6 at the turn-off voltage of the current control module 20, so that the sixth transistor M6 is quickly turned off. The connection path between the second power line L2 and the first power line L1 is disconnected, the driving current is zero, and the light-emitting diode D1 is extinguished, thereby realizing the control of the light-emitting time. And when the sixth transistor M6 is turned off, the second capacitor C2 can maintain the stability of the gate potential of the sixth transistor M6, so that the sixth transistor M6 is quickly turned off.

[0126] On the other hand, during the light-emitting process, when the temperature of the light-emitting diode D1 exceeds the preset temperature, the first transistor M1 and the fourth transistor M4 are turned off in response to the first potential control signal VB1, and the second transistor M2 is turned on in response to the first potential control signal VB1. As the temperature rises, the transistor Q1 is turned on, so that the third transistor M3 is turned off, and the output end of the second control unit 402 outputs a high potential. After the inversion action of the first inverter I1, the potential of the gate of the seventh transistor M7 is a low level, the seventh transistor M7 is turned off, and the light-emitting diode D1 stops emitting light. Preventing the light-emitting diode D1 from being damaged by excessive temperature is beneficial to improving the light-emitting efficiency.

[0127] Fig.17 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, Fig.15 The difference between the pixel circuit shown in FIG. 1 and FIG. 2 is that the potential switching unit 404 includes two first inverters I1 connected in series, and the output end of the temperature control module 40 is connected to the gate of the sixth transistor M6, and there is no need to set the seventh transistor M7, which is beneficial to reducing the layout space occupied by the pixel circuit. Fig.15 The pixel circuit shown in the figure works similarly and is also applicable to Fig.16 The driving timing shown will not be repeated here.

[0128] In the above technical solutions, in some special applications, when the temperature of the light-emitting diode D1 exceeds the preset temperature, the degree of shutdown of the seventh transistor M7 can be changed by adjusting the size of the third power supply voltage VDDW on the third power supply line L3, so as to control the light-emitting diode D1 to be in a non-completely extinguished state. Since the light-emitting brightness is reduced, the temperature of the light-emitting diode D1 can also be reduced, which is conducive to realizing over-temperature protection of the device.

[0129] Optionally, an embodiment of the present invention further provides a driving method for a pixel circuit, and the driving method can be applicable to the pixel circuit provided by any of the above technical solutions. Fig.18 A flowchart of a driving method for a pixel circuit provided by an embodiment of the present invention, combined with Fig.18 and Figure 1 Specifically, the driving method of the pixel circuit includes:

[0130] S110. In the light-emitting stage, the current control module is controlled to conduct the connection path between the first power line and the second power line to control the light-emitting module to emit light, and the time control module is controlled to control the potential of the control end of the current control module according to the time data signal and the sweep signal to control the light-emitting time of the light-emitting module.

[0131] S120: When the temperature of the light emitting module exceeds a preset temperature, the temperature control module is controlled to shut down the current control module.

[0132] The technical solution provided by the embodiment of the present invention is to set a temperature control module 40 at the control end G1 of the current control module 20. During the light-emitting process, the temperature control module 40 controls the potential of the control end G1 of the current control module 20 according to the temperature of the light-emitting module 30, so that when the temperature of the light-emitting module 30 exceeds a preset temperature, the current control module is controlled to shut down to cut off the connection path between the first power line and the second power line, so that the light-emitting module 30 stops emitting light, thereby being able to control the operating temperature of the light-emitting module 30 within a certain range, thereby preventing the light-emitting module 30 from affecting the light-emitting efficiency or being damaged due to excessively high temperature.

[0133] 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.19 A schematic diagram of a display panel according to an embodiment of the present invention is provided. The display panel 200 can be Fig.19 The mobile phone panel shown can also be a display panel in electronic devices such as tablets, mobile phones, watches, wearable devices, and vehicle displays, camera displays, televisions, and computer screens. 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.

[0134] 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.

[0135] 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: Time control module, current control module, light emitting module and temperature control module; The current control module and the light-emitting module are connected between a first power line and a second power line, and the current control module is used to control the on-off state of the connection path between the first power line and the second power line to control the light-emitting module to emit light; The time control module is used to control the potential of the control end of the current control module according to the time data signal and the sweep frequency signal, so as to control the light-emitting time of the light-emitting module; The temperature control module is connected to the control end of the current control module, and is used to control the potential of the control end of the current control module according to the temperature of the light-emitting module, and control the current control module to shut down when the temperature of the light-emitting module exceeds a preset temperature.

2. The pixel circuit according to claim 1, characterized in that: The temperature control module includes a first control unit and a second control unit; The first control end of the first control unit is connected to the first potential control signal line, and the second control end is connected to the reference voltage signal line, and the first control unit is used to control the potential of its own output end according to the first potential control signal on the first potential control signal line and the reference voltage on the reference voltage signal line based on the temperature of the light-emitting module; The first control end of the second control unit is connected to the second potential control signal line, and the second control end is connected to the output end of the first control unit. The second control unit is used to control the potential of the control end of the current control module according to the potential of the output end of the first control unit and the second potential control signal on the second potential control signal line.

3. The pixel circuit according to claim 2, characterized in that: The first control unit includes a first transistor and a triode, the gate of the first transistor is connected to the first potential control signal line, the first electrode of the first transistor is connected to the third power line, the second electrode of the first transistor and the first electrode of the triode are connected to the output end of the first control unit, the base of the triode is connected to the reference voltage signal line, and the second electrode of the triode is connected to the second power line; The second control unit includes a second transistor and a third transistor, the gate of the second transistor is connected to the second potential control signal line, the first electrode of the second transistor is connected to the third power line, the second electrode of the second transistor and the first electrode of the third transistor are connected to the output end of the second control unit, the gate of the third transistor is connected to the first electrode of the triode, and the second electrode of the third transistor is connected to the second power line; Preferably, the channel type of the first transistor is the same as the channel type of the second transistor, and the first potential control signal and the second potential control signal are inverted signals to each other; Preferably, a channel type of the first transistor is opposite to a channel type of the second transistor, and the first potential control signal line is multiplexed as the second potential control signal line.

4. The pixel circuit according to claim 2, characterized in that: The temperature control module further includes a feedback unit, which is connected between the third power line and the second control terminal of the second control unit, and is used to control the potential of the second control terminal of the second control unit according to the potential of the control terminal of the current control module; Preferably, the feedback unit includes a fourth transistor and a fifth transistor, the gate of the fourth transistor is connected to the first potential 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 fifth transistor, the second electrode of the fifth transistor is connected to the second control end of the second control unit, and the gate of the fifth transistor is connected to the control end of the current control module.

5. The pixel circuit according to claim 2 or 4, characterized in that: The temperature control module further includes a potential switching unit, which is connected between the output end of the second control unit and the control end of the current control module, and is used to switch the potential of the output end of the second control unit to a potential matched by the control end of the current control module; Preferably, the potential switching unit comprises at least one first inverter; Preferably, the temperature control module further comprises a first voltage stabilizing unit, wherein the first voltage stabilizing unit is connected between the output end of the second control unit and the second power line; Preferably, the first voltage stabilizing unit includes a first capacitor.

6. The pixel circuit according to claim 1, characterized in that: It also includes a voltage optimization module, which is connected between the output end of the time control module and the control end of the current control module, and is used to keep the control end of the current control module at a shutdown voltage according to the potential of the output end of the time control module when the light emission ends; Preferably, the voltage optimization module comprises a second inverter and a third inverter connected in series, the input end of the second inverter is connected to the output end of the time control module, and the output end of the third inverter is connected to the control end of the current control module; Preferably, the voltage optimization module further includes a second voltage stabilizing unit, and the second voltage stabilizing unit is connected to the control end of the current control module; Preferably, the voltage optimization module further comprises a reset unit, a control end of the reset unit is connected to a reset signal line, and the reset unit is connected between the first initialization signal line and the control end of the current control module.

7. The pixel circuit according to claim 1, characterized in that: The current control module includes a first current control unit, a control end of the first current control unit serves as a control end of the current control module, and the first current control unit and the light emitting module are connected between the first power line and the second power line; or The current control module includes a first current control unit and a second control unit, the control end of the current control module includes a first control end and a second control end, the control end of the first current control unit serves as the first control end of the current control module, the control end of the second current control unit serves as the second control end of the current control module, and the first current control unit, the second current control unit and the light emitting module are connected between the first power line and the second power line; Preferably, the current control module further includes a first driving unit, a first data writing unit and a first storage unit, wherein the first driving unit is connected between the first power line and the first end of the first current control unit, the first data writing unit is connected to the first driving unit, the first data writing unit is used to write the current data signal to the control end of the first driving unit, and the first storage unit is connected between the first power line and the control end of the first driving unit; Preferably, the current control module further includes a first compensation unit, the first compensation unit is connected between the first end and the control end of the first driving unit, and the control end of the first compensation unit and the control end of the first data writing unit are both connected to the first scan line; Preferably, the current control module further includes a first initialization unit and a second initialization unit, the control end of the first initialization unit is connected to the second scan line, the first end of the first initialization unit is connected to the first initialization signal line, and the second end is connected to the control end of the first driving unit; the control end of the second initialization unit is connected to the second scan line, the second initialization unit is connected between the second initialization signal line and the first end of the light emitting module, and the second end of the light emitting module is connected to the second power line; Preferably, the current control module also includes a first light-emitting control unit and a second light-emitting control unit, the control end of the first light-emitting control unit is connected to the first light-emitting control signal line, the first light-emitting control unit is connected between the second end of the first current control unit and the first end of the light-emitting module, or the first light-emitting control unit and the second current control unit are connected in series between the second end of the first current control unit and the first end of the light-emitting module; the second light-emitting control unit is connected between the first power line and the first end of the first driving unit, and the control end of the second light-emitting control unit is connected to the second light-emitting control signal line.

8. The pixel circuit according to claim 1, characterized in that: The time control module includes a second driving unit, a second data writing unit, a third initialization unit, a coupling unit and a second storage unit; The second driving unit is connected between the third power line and the output end of the time control module, and the second data writing unit is used to write the time data signal to the control end of the second driving unit; the third initialization unit is connected between the third initialization signal line and the control end of the second driving unit, and the control end of the third initialization unit is connected to the third scan line, and the second storage unit is connected between the third power line and the control end of the second driving unit; The coupling unit is connected to the control end of the second driving unit, and the coupling unit is used to control the potential of the control end of the second driving unit according to the sweep signal; Preferably, the time control module further comprises a second compensation unit, the second compensation unit is connected between the control end and the second end of the second driving unit, and the control end of the second compensation unit and the control end of the second data writing unit are both connected to the fourth scan line; Preferably, the time control module further includes a third light-emitting control unit and a fourth light-emitting control unit, 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 third power line, the second end of the third light-emitting control unit is connected to the first end of the second driving unit, the first end of the fourth light-emitting control unit is connected to the second end of the second driving unit, and the second end of the fourth light-emitting control unit is connected to the output end of the time control module; Preferably, the time control module further comprises a fourth initialization unit, a control end of the fourth initialization unit is connected to the third scan line, and the fourth initialization unit is connected between a fourth initialization signal line and an output end of the time control module.

9. A method for driving a pixel circuit, characterized in that: The pixel circuit comprises a time control module, a current control module, a light emitting module and a temperature control module, wherein the current control module and the light emitting module are connected between a first power line and a second power line, and the temperature control module is connected to a control end of the current control module; The driving method of the pixel circuit includes: In the light-emitting stage, the current control module is controlled to conduct the connection path between the first power line and the second power line to control the light-emitting module to emit light, and the time control module is controlled to control the potential of the control end of the current control module according to the time data signal and the sweep signal to control the light-emitting time of the light-emitting module; When the temperature of the light emitting module exceeds a preset temperature, the temperature control module is controlled to turn off the current control module.

10. A display panel, characterized in that: Comprising the pixel circuit as described in any one of claims 1-8.

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