Pixel circuits, their driving methods, and display panels

Abstract

This invention discloses a pixel circuit, its driving method, and a display panel. The pixel circuit includes a time control module, a current control module, a light-emitting module, and a temperature control module. The time control module controls the potential of the control terminal of the current control module according to a time data signal and a frequency sweep signal to control the light-emitting time of the light-emitting module. The temperature control module is connected to the control terminal of the current control module. During the light-emitting process, the temperature control module controls the potential of the control terminal of the current control module according to the temperature of the light-emitting module. When the temperature of the light-emitting module exceeds a preset temperature, the current control module is turned off to cut off the connection path between the first power line and the second power line, causing the light-emitting module to stop emitting light. This allows the operating temperature of the light-emitting module to be controlled within a certain range, preventing the light-emitting module from being affected by excessive temperature or damaged.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a pixel circuit, its driving method, and a display panel. Background Technology

[0002] With the continuous development of display technology, people have increasingly higher requirements for the display quality of display devices.

[0003] In existing driving methods, the light-emitting elements have low luminous efficiency and unstable light emission, resulting in poor display quality. Summary of the Invention

[0004] This invention provides a pixel circuit, its driving method, and a display panel to improve display quality.

[0005] According to one aspect of the present invention, a pixel circuit is provided, 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 the first power line and the second power line. 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 so as to control the light-emitting module to emit light.

[0007] The time control module is used to control the potential of the control terminal of the current control module according to the time data signal and the frequency sweep signal, so as to control the light emission time of the light emission module.

[0008] The temperature control module is connected to the control terminal of the current control module and is used to control the potential of the control terminal of the current control module according to the temperature of the light-emitting module, and to control the current control module to turn off 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 terminal of the first control unit is connected to a first potential control signal line, and the second control terminal is connected to a reference voltage signal line. The first control unit is used to control the potential of its own output terminal 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 terminal of the second control unit is connected to the second potential control signal line, and the second control terminal is connected to the output terminal of the first control unit. The second control unit is used to control the potential of the control terminal of the current control module according to the potential of the output terminal 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 terminal of the first transistor is connected to the third power supply line, the second terminal of the first transistor and the first terminal of the triode are connected to the output terminal of the first control unit, the base of the triode is connected to the reference voltage signal line, and the second terminal of the triode is connected to the second power supply 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 terminal of the second transistor is connected to the third power supply line, the second terminal of the second transistor and the first terminal of the third transistor are connected to the output terminal of the second control unit, the gate of the third transistor is connected to the first terminal of the transistor, and the second terminal of the third transistor is connected to the second power supply line.

[0013] Optionally, the channel type of the first transistor is the same as that of the second transistor, and the first potential control signal and the second potential control signal are inverted signals.

[0014] Optionally, the channel type of the first transistor is opposite to that 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, which is connected between the third power line and the second control terminal of the second control unit. The feedback unit 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.

[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 terminal of the fourth transistor is connected to the third power supply line, the second terminal of the fourth transistor is connected to the first terminal of the fifth transistor, the second terminal of the fifth transistor is connected to the second control terminal of the second control unit, and the gate of the fifth transistor is connected to the control terminal of the current control module.

[0017] Optionally, the temperature control module further includes a potential switching unit, which is connected between the output terminal of the second control unit and the control terminal of the current control module. The potential switching unit is used to switch the potential of the output terminal of the second control unit to the potential matched by the control terminal 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 regulator unit, which is connected between the output terminal of the second control unit and the second power line;

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

[0021] Optionally, it also includes a voltage optimization module, which is connected between the output terminal of the time control module and the control terminal of the current control module. The voltage optimization module is used to keep the control terminal of the current control module at the off voltage according to the potential of the output terminal 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 terminal of the second inverter is connected to the output terminal of the time control module, and the output terminal of the third inverter is connected to the control terminal of the current control module.

[0023] Optionally, the voltage optimization module further includes a second voltage regulation unit, which is connected to the control terminal of the current control module;

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

[0025] Optionally, the current control module includes a first current control unit, the control terminal of the first current control unit serves as the control terminal 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 terminal of the current control module includes a first control terminal and a second control terminal. The control terminal of the first current control unit serves as the first control terminal of the current control module, and the control terminal of the second current control unit serves as the second control terminal of the current control module. 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. The first driving unit is connected between the first power line and the first terminal of the first current control unit. The first data writing unit is connected to the first driving unit and is used to write current data signals to the control terminal of the first driving unit. The first storage unit is connected between the first power line and the control terminal of the first driving unit.

[0028] Optionally, the current control module further includes a first compensation unit, which is connected between the first end and the control end of the first driving unit. 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 terminal of the first initialization unit is connected to the second scan line, the first terminal of the first initialization unit is connected to the first initialization signal line, and the second terminal is connected to the control terminal of the first driving unit. The control terminal of the second initialization unit is connected to the second scan line, and the second initialization unit is connected between the second initialization signal line and the first terminal of the light-emitting module. The second terminal of the light-emitting module is connected to the second power line.

[0030] Optionally, the current control module further includes a first light-emitting control unit and a second light-emitting control unit. The control terminal of the first light-emitting control unit is connected to a first light-emitting control signal line. The first light-emitting control unit is connected between the second terminal of the first current control unit and the first terminal of the light-emitting module. Alternatively, the first light-emitting control unit and the second current control unit are connected in series between the second terminal of the first current control unit and the first terminal of the light-emitting module. The second light-emitting control unit is connected between the first power line and the first terminal of the first driving unit. The control terminal of the second light-emitting control unit is connected to a 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 terminal of the time control module. The second data writing unit is used to write the time data signal to the control terminal of the second driving unit. The third initialization unit is connected between the third initialization signal line and the control terminal of the second driving unit. The control terminal of the third initialization unit is connected to the third scan line. The coupling unit is connected to the control terminal of the second driving unit. The coupling unit is used to control the potential of the control terminal of the second driving unit according to the sweep frequency signal. The second storage unit is connected between the third power line and the control terminal of the second driving unit.

[0033] Optionally, the time control module further includes a second compensation unit, which is connected between the control terminal and the second terminal of the second drive unit. The control terminal of the second compensation unit and the control terminal 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 terminals of the third and fourth light-emitting control units are both connected to the second light-emitting control signal line. The first terminal of the third light-emitting control unit is connected to the third power supply line, the second terminal of the third light-emitting control unit is connected to the first terminal of the second driving unit, the first terminal of the fourth light-emitting control unit is connected to the second terminal of the second driving unit, and the second terminal of the fourth light-emitting control unit is connected to the output terminal of the time control module.

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

[0036] According to another aspect of the present invention, a driving method for a pixel circuit is provided. The pixel circuit includes a timing control module, a current control module, a light-emitting module, and a temperature control module. The current control module and the light-emitting module are connected between a first power line and a second power line. The temperature control module is connected to the control terminal of the current control module. The driving method for the pixel circuit includes:

[0037] During 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 terminal of the current control module according to the time data signal and the frequency sweep signal to control the light-emitting time of the light-emitting module.

[0038] When the temperature of the light-emitting module exceeds the 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 including the pixel circuit provided in any embodiment of the present invention.

[0040] The technical solution provided by this invention includes a temperature control module at the control terminal of the current control module. During the light emission process, the temperature control module controls the potential of the control terminal of the current control module according to the temperature of the light emission module. When the temperature of the light emission module exceeds a preset temperature, the current control module is turned off to cut off the connection path between the first power line and the second power line, thereby stopping the light emission module from emitting light. This allows the operating temperature of the light emission module to be controlled within a certain range, preventing the light emission module from being affected by excessively high temperatures, thus preventing damage or loss of luminous efficiency.

[0041] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0044] Figure 2 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0048] Figure 6 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0049] Figure 7This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0051] Figure 9 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0052] Figure 10 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0053] Figure 11 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0054] Figure 12 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0055] Figure 13 This is a schematic diagram of the structure of a current control module provided in an embodiment of the present invention;

[0056] Figure 14 This is a schematic diagram of the structure of a time control module provided in an embodiment of the present invention;

[0057] Figure 15 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0058] Figure 16 A schematic diagram of the driving timing of a pixel circuit provided in an embodiment of the present invention;

[0059] Figure 17 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0060] Figure 18 A flowchart illustrating a pixel circuit driving method provided in an embodiment of the present invention;

[0061] Figure 19 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention. Detailed Implementation

[0062] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort 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, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0064] Figure 1 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention, with reference to... 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, so as 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 frequency signal SWEEP, so as to control the light emission time of the light emission module 30.

[0066] The temperature control module 40 is connected to the control terminal G1 of the current control module 20. It 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 to control the current control module 20 to turn off when the temperature of the light-emitting module 30 exceeds the preset temperature.

[0067] Specifically, the first power line L1 provides the first power supply voltage VDDA, and the second power line L2 provides the 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 completed, 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 frequency sweep signal SWEEP, so that the current control module 20 is turned off, cutting off the connection path between the first power line L1 and the second power line L2, and the light-emitting module 30 stops emitting light.

[0068] The light-emitting module 30 typically includes a light-emitting diode. During prolonged light emission, the temperature of the light-emitting module 30 will rise. If it exceeds the upper limit of its temperature tolerance, it may damage the light-emitting elements (such as light-emitting diodes) included in the light-emitting module 30.

[0069] In this 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 turned off to turn off the current control module 20, so that the light-emitting module 30 stops emitting light. This allows the light-emitting module 30 to operate within a certain temperature range, preventing the light-emitting module 30 from being too hot, which could lead to a decrease in luminous efficiency and brightness decay, or damage to the light-emitting module 30.

[0070] It should be noted that during the illumination period of the light-emitting module 30, the temperature control module 40's control of the control terminal G1 potential of the current control module 20 is adjustable based on the temperature of the light-emitting module 30. That is, the degree of adjustment of the control terminal G1 potential of the current control module by the temperature control module 40 varies with different temperatures. For example, when the preset temperature is the maximum temperature that the light-emitting module 30 can withstand, and when the temperature of the light-emitting module 30 is close to the preset temperature, the degree of adjustment of the control terminal G1 potential of the current control module 20 by the temperature control module 40 is small, which can keep the current control module 20 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 degree of adjustment of the control terminal G1 potential of the current control module 20 by the temperature control module 40 is large, which can keep the current control module 20 in a completely off state, cutting off the driving current of the light-emitting module 30 and stopping the illumination. Whether reducing the driving current or cutting off the driving current, both can effectively reduce the temperature of the light-emitting module 30 and improve its reliability.

[0071] The technical solution provided in this embodiment of the invention includes a temperature control module 40 at the control terminal G1 of the current control module 20. During the light emission process, the temperature control module 40 controls the potential of the control terminal G1 of the current control module 20 according to the temperature of the light emission module 30. When the temperature of the light emission module 30 exceeds a preset temperature, the current control module is turned off to cut off the connection path between the first power line and the second power line, thereby stopping the light emission module 30 from emitting light. This allows the operating temperature of the light emission module 30 to be controlled within a certain range, preventing the light emission module 30 from being affected by excessively high temperatures, thus preventing damage or loss of luminous efficiency.

[0072] Figure 2 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 2Based on 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 unit 401 has a first control terminal connected to a first potential control signal line to receive a first potential control signal VB1 transmitted from the first potential control signal line, and a second control terminal connected to a reference voltage signal line to receive a reference voltage Vref transmitted from the reference voltage signal line. The first control unit 401 controls the potential of its output terminal based on the temperature of the light-emitting module 401, 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.

[0073] The first control terminal 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. The second control terminal is connected to the output terminal of the first control unit 401. Here, the output terminal of the second control unit 402 is connected to the output terminal of the temperature control module 40. The second control unit 402 is used to control the potential of the control terminal G1 of the current control module 20 according to the potential of the output terminal 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 change of the light-emitting module 30, thereby changing the potential of its output terminal, and thus 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. For example, 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 its output terminal.

[0075] Figure 3 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 3 Based on the above technical solution, specifically, the first control unit 401 includes a first transistor M1 and a transistor Q1. The gate of the first transistor M1 is connected to the first potential control signal line, the first terminal of the first transistor M1 is connected to the third power supply line L3, the second terminal of the first transistor M1 and the first terminal of the transistor Q1 are connected to the output terminal of the first control unit 401, the base of the transistor Q1 is connected to the reference voltage signal line, and the second terminal of the transistor Q1 is connected to the second power supply 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 terminal of the second transistor M2 is connected to the third power supply line L3, the second terminal of the second transistor M2 and the first terminal of the third transistor M3 are connected to the output terminal of the second control unit 402, the gate of the third transistor M3 is connected to the first terminal of the transistor Q1, and the second terminal of the third transistor M3 is connected to the second power supply line L2.

[0077] In this circuit, the forward voltage between the base and the emitter of transistor Q1 decreases as the temperature increases. During the normal light-emitting phase, transistor Q1 is off. The first transistor M1 turns on in response to the first potential control signal VB1 on the first potential control signal line. The third power supply voltage VDDW on the third power supply line L3 is transmitted to the output of the first control unit 401 via the first transistor M1, resulting in a high potential at the output of the first control unit 401. The third transistor M3 is then off. The second transistor M2 turns on in response to the second potential control signal VB2 on the second potential control signal line, transmitting the third power supply voltage VDDW to the output of the second control unit 402. This activates the current control module 20, causing the light-emitting module 30 to emit light.

[0078] As light emission proceeds, the temperature of the light-emitting module 30 gradually increases. Consequently, the voltage between the base and the second terminal of transistor Q1 gradually decreases. By setting the magnitude of the reference voltage Vref transmitted on the reference voltage signal line, transistor Q1 can be turned on when the temperature of the light-emitting module 30 exceeds a preset temperature. This pulls the potential at the output terminal of the first control unit 401 down to the second power supply voltage VSS. At this time, the first transistor M1 turns off in response to the first potential control signal VB1. The third transistor M3 turns on in response to the low potential at the output terminal of the first control unit 401, pulling the potential at the output terminal of the second control unit 402 down, thereby controlling the current control module 20 to turn off, and the light-emitting module 30 stops emitting light, preventing damage to the light-emitting module 30 due to overheating.

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

[0080] Figure 4 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention. Figure 4 The pixel circuit and Figure 3 The difference in the pixel circuits shown is that, Figure 4In this configuration, the second transistor M2 and the third transistor M3 have the same channel type, both being N-type transistors. Here, the current control module 20 can turn on in response to a low level. For example, during the normal light-emitting phase, transistor Q1 is off, the first transistor M1 turns 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 via the first transistor M1. The output terminal of the first control unit 401 is at a high potential, and the third transistor M3 turns on. The second transistor M2 turns 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 multiplexed 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 terminal of the second control unit 402, thereby turning on the current control module 20, and the light-emitting module 30 emits light.

[0081] As light emission proceeds, the temperature of the light-emitting module 30 gradually increases. Consequently, the voltage between the base and the second terminal of transistor Q1 gradually decreases. When the temperature of the light-emitting module 30 rises to a level that causes transistor Q1 to conduct, transistor Q1 pulls the potential of the output terminal of the first control unit 401 down to the second power supply voltage VSS. At this time, the first transistor M1 turns off in response to the first potential control signal VB1, and the second transistor M2 turns on in response to either the first potential control signal VB1 or the second potential control signal VB2. The third transistor M3 turns off in response to the low potential of the output terminal of the first control unit 401. Therefore, the potential of the output terminal of the second control unit 402 is pulled up by the second transistor M1 to the third power supply voltage VDDW, thereby controlling the current control module 20 to turn off, and the light-emitting module 30 stops emitting light, preventing damage to the light-emitting module 30 due to overheating.

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

[0083] Figure 5 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 5Based on the above technical solutions, optionally, the temperature control module 40 further includes a potential switching unit 404. The potential switching unit 404 is connected between the output terminal of the second control unit 402 and the control terminal G1 of the current control module 20. The potential switching unit 404 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 first inverters can be set according to the required potential of the control terminal G1 of the current control module 20.

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

[0086] Figure 6 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 6 Based on the above technical solution, optionally, the temperature control module 40 further includes a feedback unit 403. The feedback unit 403 is connected between the third power line and the second control terminal of the second control unit 402. The feedback unit 403 is used to control the potential of the second control terminal of the second control unit 402 according to the potential of the control terminal G1 of the current control module 20, so as to ensure the accuracy of the potential of the second control terminal 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 structure provided in an embodiment of the present invention is shown below. 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 terminal of the fourth transistor M4 is connected to the third power supply line L3, the second terminal of the fourth transistor M4 is connected to the first terminal of the fifth transistor M5, the second terminal of the fifth transistor M5 is connected to the second control terminal of the second control unit 402, and the gate of the fifth transistor M5 is connected to the control terminal G1 of the current control module 20.

[0088] Taking the second control unit 402, where both the second transistor M2 and the third transistor M3 are N-type transistors, as an example, the gate of the third transistor M3 serves as the second control terminal of the second control unit 402, and the gate of the second transistor M2 serves as the first control terminal of the second control unit 402. The fifth transistor M5 is also an N-type transistor. The current control module 20 turns on in response to a high potential at its control terminal G1. During the normal light-emitting phase, transistor Q1 is off, and the first transistor M1 and the fourth transistor M4 turn on in response to the first potential control signal VB1 on the first potential control signal line. 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 via the first transistor M1, resulting in a high potential at the output terminal of the first control unit 401, and the third transistor M3 turns on. The second transistor M2 turns 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 high, thus turning on the current control module 20, and the light-emitting module 30 emits light. Furthermore, the fifth transistor M5 responds 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, transistor Q1 turns on, causing the third transistor M3 to turn off. The output terminal of the second control unit 402 outputs a high potential. After being inverted by the first inverter I1, the potential of the control terminal G1 of the current control module 20 becomes low, the current control module 20 turns off, and the light-emitting module 30 stops emitting light. Furthermore, the fifth transistor M5 responds to the low potential of the control terminal G1 of the current control module 20 and turns off, while the third transistor M3 remains off.

[0090] Figure 8 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 8 Based on the above technical solutions, optionally, the current control module 20 includes a first current control unit 201, the control terminal of the first current control unit 201 serves as the control terminal 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 terminals of the time control module 10 and the temperature control module 40 can be connected to different control terminals of the current control module 20 respectively to prevent different potentials from interfering with the same control terminal of the current control module 20. Figure 9 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 9The current control module 20 includes a first current control unit 201 and a second control unit 202. The control terminals of the current control module 20 include a first control terminal G1-1 and a second control terminal G1-2. The control terminal of the first current control unit 201 serves as the first control terminal G1-1 of the current control module 20, and the control terminal of the second current control unit 202 serves as the second control terminal 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 embodiment provided in this example, the pixel circuit provided in this embodiment will be described below with the current control module 20 including a first current control unit 201 and a second current control unit 201 as an example.

[0093] Figure 10 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 10 Based on the above technical solutions, the pixel circuit may optionally include a voltage optimization module 50. 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 (specifically, the first control terminal G1-1 of the current control module 20). The voltage optimization module 50 is used to keep the control terminal G1 of the current control module 20 at the off voltage according to the potential of the output terminal of the time control module 10 when the light emission ends.

[0094] Specifically, the first power line L1 provides the first power supply voltage VDDA, and the second power line L2 provides the second power supply voltage VSS. The current control module 20 generates a driving current when the connection path between the first power line L1 and the second power line L2 is open, driving the light-emitting module 30 to emit light. The time control module 10 outputs a time control signal based on the time data signal Vdata_t and the frequency sweep signal SWEEP to control the potential of the control terminal of the current control module 20, specifically controlling the potential of the control terminal of the first current control unit 201, thereby controlling 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, making the time control module 10 and the current control module 20 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 module 10 causes instability in its time control signal 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 turn-off voltage (for example, the turn-off voltage can be the third power supply voltage VDDW; in other embodiments, the turn-off voltage can be any voltage that can turn off the current control module 20). This prevents the potential of the first control terminal G1-1 of the current control module 20 from decaying or becoming unstable, thereby ensuring that the current control module 20 can be quickly turned off when the light emission ends. This reduces the phenomenon of drive current decay caused by the instability of the current control module 20's own control terminal potential, improves the difference in drive current between different pixels, enhances the uniformity of drive current, effectively avoids differences in light emission time between different pixels, and is beneficial to improving the display effect.

[0096] Figure 11 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 11 Based on 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 terminal of the second inverter I2 is connected to the output terminal of the time control module 10, and the output terminal of the third inverter I3 is connected to the control terminal of the current control module 201 (specifically, the first control terminal G1-1 of the current control module 20). By setting the second inverter I2 and the third inverter I3 to quickly pull the control terminal of the first current control unit 20 to the turn-off voltage while ensuring that the voltage optimization module 50 does not change the polarity of the time control signal output by the time control module 10, the current control module 20 is quickly turned off.

[0097] Figure 12 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 12 Based on the above technical solution, the voltage optimization module 50 may optionally include a second voltage regulator 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 terminal 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 terminal G1-1 of the current control module 201. Before the light-emitting stage, the reset unit 502, in response to the reset signal Set transmitted on the reset signal line, transmits the first initialization voltage Vinit1 on the first initialization signal line to the first control terminal G1-1 of the current control module 201 to initialize the potential of the control terminal of the first current control unit 201.

[0099] It should be understood that when the current control module 20 includes only the first current control unit 201, the current control module 20 includes only the first control terminal G1-1, and the control terminal of the current control module 20 (i.e. 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 pixel circuits driven by mixed-signal and digital signals. Figure 13 This is a schematic diagram of a current control module provided in an embodiment of the present invention, with reference to... Figure 13 Based on the above technical solutions, the current control module 20 may optionally include 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 and is used to write the current data signal Vdata_I to the control end of the first driving unit 203. 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. The first compensation unit 206 is connected between the first terminal and the control terminal of the first drive unit 203. The control terminal of the first compensation unit 206 and the control terminal 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 drive unit 203 to improve the problem of poor uniformity of the drive current caused by the change of the threshold characteristics of the first drive unit 203.

[0102] Optionally, the current control module 20 further includes a first light-emitting control unit 209 and a second light-emitting control unit 210. The control terminal of the first light-emitting control unit 209 is connected to the first light-emitting control signal line. The first light-emitting control unit 209 and the second current control unit 202 are connected in series between the second terminal of the first current control unit 201 and the first terminal of the light-emitting module 30. The second light-emitting control unit 210 is connected between the first power line L1 and the first terminal of the first driving unit 203. The control terminal 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 disconnect the connection between the first power line L1 and the first driving unit 203 during 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 terminal of the first driving unit 203, thereby affecting the light-emitting quality.

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

[0106] Figure 14 This is a schematic diagram of the structure of a time control module provided in an embodiment of the present invention, with reference to... Figure 14Based on 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 terminal 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 terminal of the second driving unit 101. The third initialization unit 103 is connected between the third initialization signal line and the control terminal of the second driving unit 101. The control terminal 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 terminal of the second driving unit 101 and is used to store the potential of the control terminal of the second driving unit 101.

[0107] The coupling unit 104 is connected to the control terminal of the second drive unit 101. The coupling unit 104 is used to control the potential of the control terminal of the second drive unit 101 according to the sweep frequency signal SWEEP.

[0108] For example, before the light-emitting stage, the third initialization unit 103, in response to the third scan signal S3 on the third scan line, transmits the third initialization voltage Vinit3 on the third initialization signal line to the control terminal of the second driving unit 101 to initialize the control terminal of the second driving unit 101. Afterwards, the time data signal Vdata_t is transmitted to the control terminal 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. During the light-emitting stage, the current control module 20 can generate a driving current based on the voltage state of its control terminal to drive the light-emitting module 30 to emit light. The frequency sweep signal SWEEP is used to scan the signal from high to low level or from low to high level during the light-emitting stage to control the voltage at the output terminal of the time control module 10, thereby controlling the voltage at the control terminal of the current control module 20, and thus controlling the operating state (on or off) of the current control module 20, thereby controlling the light-emitting time of the light-emitting module 30.

[0109] Optionally, the time control module 10 further includes a second compensation unit 105, which is connected between the control terminal and the second terminal of the second drive unit 101. The control terminal of the second compensation unit 105 and the control terminal 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 terminals of the third light-emitting control unit 106 and the fourth light-emitting control unit 107 are both connected to the second light-emitting control signal line. The first terminal of the third light-emitting control unit 106 is connected to the third power line L3. The second terminal of the third light-emitting control unit 106 is connected to the first terminal of the second drive unit 101. The first terminal of the fourth light-emitting control unit 107 is connected to the second terminal of the second drive unit 101. The second terminal of the fourth light-emitting control unit 107 is connected to the output terminal of the time control module 10.

[0111] Optionally, the time control module 10 further includes a fourth initialization unit 108. The control terminal of the fourth initialization unit 108 is connected to the third scan line. The fourth initialization unit 108 is connected between the fourth initialization signal line and the output terminal of the time control module 10, and is used to initialize the output terminal of the time control module.

[0112] Figure 15 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, specifically a schematic diagram of the pixel circuit structure as a device. 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 regulator unit 501 includes a second capacitor C2. The light-emitting module 30 includes a light-emitting diode D1, which can be an LED, OLED, Micro LED, or Mini LED.

[0114] Figure 16 This is a driving timing diagram of a pixel circuit provided in an embodiment of the present invention, which can be applied to... Figure 15 The pixel circuit shown is illustrated. Taking the second transistor M2, third transistor M3, fifth transistor M5, and seventh transistor M7 as examples where all other transistors are P-type transistors, and combining this with... Figure 16 The working process of the pixel circuit provided in this embodiment includes: voltage writing stage T1, reset stage T2 and light emission stage T3, wherein the voltage writing stage T1 includes initialization stage t1, first data writing stage t2 and second data writing stage t3.

[0115] During initialization phase 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 signal 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, transmitting the second initialization voltage Vinit2 on the second initialization signal line to the gate of the eighth transistor M8 and the first terminal of the light-emitting diode D1, respectively, thus initializing the gate of the eighth transistor M8 and the first terminal of the light-emitting diode D1.

[0116] During 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 signal 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 emission control signal line is configured to transmit a high-level first light emission control signal EM1, and the second light emission control signal line is configured to transmit a high-level second light emission 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. The gate potential of the eighth transistor M8 is Vdata_I + Vth8, and it is stored in the third capacitor C3, where Vth8 is the threshold voltage of the eighth transistor M8, achieving threshold compensation for the eighth transistor M8.

[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 it on. Simultaneously, the fourth initialization voltage Vinit4 on the fourth initialization signal line is transmitted to the output of the time control module 10 via the twenty-first transistor M21, thus initializing the output of the time control module 10.

[0118] During 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 signal 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 emission control signal line is configured to transmit a high-level first light emission control signal EM1, and the second light emission control signal line is configured to transmit a high-level second light emission 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 through the sixteenth transistor M16, the fifteenth transistor M15, and the seventeenth transistor M17 to the gate of the fifteenth transistor M15. The fifteenth transistor M15 is turned off when its gate potential reaches Vdata_t + Vth15, where 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 process of the fifteenth transistor M15, setting the twentieth transistor M20 can improve the phenomenon of unstable gate potential of the fifteenth transistor M15 caused by the leakage current of the twenty-first transistor M21, which is beneficial to improve the accuracy of the time control signal output by the time control module 10.

[0120] The t4 stage is the time period of the voltage writing stage T1 for each of the remaining sub-pixels to complete the data writing for all pixel rows.

[0121] During 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 signal 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 emission control signal line is configured to transmit a high-level first light emission control signal EM1, and the second light emission control signal line is configured to transmit a high-level second light emission control signal EM2. Therefore, the twenty-second transistor M22 is turned on, transmitting the first initialization voltage Vinit on the first initialization signal line to the gate of the sixth transistor M6, initializing the gate of the sixth transistor M6. The second capacitor C2 maintains the gate potential of the sixth transistor M6, and the sixth transistor M6 is turned on.

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

[0123] During 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 signal 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, while the second transistor M2 is turned off in response to the first potential control signal VB1, and transistor Q1 is in the off state. The third transistor M3 turns 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. Therefore, the seventh transistor M7 and the fifth transistor M5 turn on, and the third power supply voltage VDDW is transmitted to the gate of the third transistor M3 through the fourth transistor M4 and the fifth transistor M5, and the third transistor M3 remains on.

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

[0125] During the light emission process, the sweep frequency signal SWEEP gradually changes from a high level (SWEEP-H) to a low level (SWEEP-L). 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 causes it to conduct, the third power supply voltage VDDW is transmitted to the input terminal 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 turned off quickly. The connection path between the second power line L2 and the first power line L1 is disconnected, the drive current is zero, and the light-emitting diode D1 is extinguished, realizing the control of the light emission time. Moreover, 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 turned off quickly.

[0126] On the other hand, during the light-emitting process, when the temperature of LED D1 exceeds a preset temperature, the first transistor M1 and the fourth transistor M4 turn off in response to the first potential control signal VB1, while the second transistor M2 turns on in response to the first potential control signal VB1. As the temperature rises, transistor Q1 turns on, causing the third transistor M3 to turn off. The output of the second control unit 402 outputs a high potential. After inversion by the first inverter I1, the gate potential of the seventh transistor M7 becomes low, and the seventh transistor M7 turns off, stopping LED D1 from emitting light. Preventing damage to LED D1 due to excessive temperature helps improve luminous efficiency.

[0127] Figure 17 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, and... Figure 15 The difference in the pixel circuit shown is that the potential switching unit 404 includes two first inverters I1 connected in series, and the output terminal of the temperature control module 40 is connected to the gate of the sixth transistor M6, eliminating the need for a seventh transistor M7, which helps reduce the layout space occupied by the pixel circuit. The specific working process of this pixel circuit is similar to... Figure 15 The pixel circuit shown operates similarly and can also be applied to... Figure 16 The driving timing shown is not repeated here.

[0128] In some special applications, when the temperature of LED D1 exceeds the preset temperature, the turn-off degree of the seventh transistor M7 can be changed by adjusting the magnitude of the third power supply voltage VDDW on the third power supply line L3, thereby controlling LED D1 to be in a partially off state. Since the brightness is reduced, the temperature of LED D1 can also be reduced, which is beneficial to realizing the over-temperature protection of the device.

[0129] Optionally, embodiments of the present invention also provide a driving method for a pixel circuit, which can be applied to the pixel circuit provided by any of the above-described technical solutions. Figure 18 This is a flowchart of a pixel circuit driving method provided in an embodiment of the present invention, combined with... Figure 18 and Figure 1 Specifically, the driving method for this pixel circuit includes:

[0130] S110. During the light-emitting stage, the current control module connects the connection path between the first power line and the second power line to control the light-emitting module to emit light, and controls the time control module to control the potential of the control terminal of the current control module according to the time data signal and the frequency sweep signal to control the light-emitting time of the light-emitting module.

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

[0132] The technical solution provided in this embodiment of the invention includes a temperature control module 40 at the control terminal G1 of the current control module 20. During the light emission process, the temperature control module 40 controls the potential of the control terminal G1 of the current control module 20 according to the temperature of the light emission module 30. When the temperature of the light emission module 30 exceeds a preset temperature, the current control module is turned off to cut off the connection path between the first power line and the second power line, thereby stopping the light emission module 30 from emitting light. This allows the operating temperature of the light emission module 30 to be controlled within a certain range, preventing the light emission module 30 from being affected by excessively high temperatures, thus preventing damage or loss of luminous efficiency.

[0133] Optionally, embodiments of the present invention also provide a display panel, which includes the pixel circuit provided in any embodiment of the present invention. Figure 19 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention. The display panel 200 can not only serve as... Figure 19 The mobile phone panel shown can also be a display panel in tablets, mobile phones, watches, wearable devices, as well as in-vehicle displays, camera displays, televisions, and computer screens. Since this display panel includes the pixel circuits provided in any embodiment of the present invention, the display panel provided in the embodiments of the present invention also possesses 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, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0135] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A pixel circuit, characterized in that, include: Time control module, current control module, light emission module, and temperature control module; The current control module and the light-emitting module are connected between the first power line and the second power line. 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 so as to control the light-emitting module to emit light. The time control module is used to control the potential of the control terminal of the current control module according to the time data signal and the frequency sweep signal, so as to control the light emission time of the light emission module. The temperature control module is connected to the control terminal of the current control module and is used to control the potential of the control terminal of the current control module according to the temperature of the light-emitting module, and to control the current control module to turn off when the temperature of the light-emitting module exceeds the preset temperature. The temperature control module includes a first control unit and a second control unit; The first control terminal of the first control unit is connected to the first potential control signal line, and the second control terminal is connected to the reference voltage signal line. The first control unit is used to control the potential of its own output terminal 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. The first control terminal of the second control unit is connected to the second potential control signal line, and the second control terminal is connected to the output terminal of the first control unit. The second control unit is used to control the potential of the control terminal of the current control module according to the potential of the output terminal of the first control unit and the second potential control signal on the second potential control signal line.

2. The pixel circuit according to claim 1, 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 terminal of the first transistor is connected to the third power supply line, the second terminal of the first transistor and the first terminal of the triode are connected to the output terminal of the first control unit, the base of the triode is connected to the reference voltage signal line, and the second terminal of the triode is connected to the second power supply 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 terminal of the second transistor is connected to the third power supply line, the second terminal of the second transistor and the first terminal of the third transistor are connected to the output terminal of the second control unit, the gate of the third transistor is connected to the first terminal of the transistor, and the second terminal of the third transistor is connected to the second power supply line.

3. The pixel circuit according to claim 2, characterized in that, The first transistor has the same channel type as the second transistor, and the first potential control signal and the second potential control signal are inverse signals.

4. The pixel circuit according to claim 2, characterized in that, The channel type of the first transistor is opposite to that of the second transistor, and the first potential control signal line is multiplexed as the second potential control signal line.

5. The pixel circuit according to claim 1, 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. The feedback unit 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 terminal of the fourth transistor is connected to the third power supply line, the second terminal of the fourth transistor is connected to the first terminal of the fifth transistor, the second terminal of the fifth transistor is connected to the second control terminal of the second control unit, and the gate of the fifth transistor is connected to the control terminal of the current control module.

6. The pixel circuit according to claim 1 or 5, characterized in that, The temperature control module further includes a potential switching unit, which is connected between the output terminal of the second control unit and the control terminal of the current control module. The potential switching unit is used to switch the potential of the output terminal of the second control unit to the potential matched by the control terminal of the current control module.

7. The pixel circuit according to claim 6, characterized in that, The potential switching unit includes at least one first inverter.

8. The pixel circuit according to claim 6, characterized in that, The temperature control module further includes a first voltage regulator unit, which is connected between the output terminal of the second control unit and the second power line.

9. The pixel circuit according to claim 8, characterized in that, The first voltage regulator unit includes a first capacitor.

10. The pixel circuit according to claim 1, characterized in that, It also includes a voltage optimization module, which is connected between the output terminal of the time control module and the control terminal of the current control module. The voltage optimization module is used to keep the control terminal of the current control module at the off voltage according to the potential of the output terminal of the time control module when the light emission ends.

11. The pixel circuit according to claim 10, characterized in that, The voltage optimization module includes a second inverter and a third inverter connected in series. The input terminal of the second inverter is connected to the output terminal of the time control module, and the output terminal of the third inverter is connected to the control terminal of the current control module.

12. The pixel circuit according to claim 11, characterized in that, The voltage optimization module further includes a second voltage regulation unit, which is connected to the control terminal of the current control module.

13. The pixel circuit according to claim 11, characterized in that, The voltage optimization module further includes a reset unit, the control terminal of which is connected to a reset signal line, and the reset unit is connected between the first initialization signal line and the control terminal of the current control module.

14. The pixel circuit according to claim 1, characterized in that, The current control module includes a first current control unit, the control terminal of the first current control unit serves as the control terminal 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 current control unit. The control terminal of the current control module includes a first control terminal and a second control terminal. The control terminal of the first current control unit serves as the first control terminal of the current control module, and the control terminal of the second current control unit serves as the second control terminal of the current control module. 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.

15. The pixel circuit according to claim 14, characterized in that, The current control module further includes a first driving unit, a first data writing unit, and a first storage unit. 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 and is used to write current data signals to the control end of the first driving unit. The first storage unit is connected between the first power line and the control end of the first driving unit.

16. The pixel circuit according to claim 15, characterized in that, The current control module further includes a first compensation unit, which is connected between the first end and the control end of the first driving unit. 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.

17. The pixel circuit according to claim 16, characterized in that, The current control module further includes a first initialization unit and a second initialization unit. The control terminal 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 terminal of the first driving unit. The control terminal of the second initialization unit is connected to the second scan line, and the second initialization unit is connected between the second initialization signal 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.

18. The pixel circuit according to claim 17, characterized in that, The current control module further includes a first light-emitting control unit and a second light-emitting control unit. The control terminal of the first light-emitting control unit is connected to a first light-emitting control signal line. The first light-emitting control unit is connected between the second terminal of the first current control unit and the first terminal of the light-emitting module. Alternatively, the first light-emitting control unit and the second current control unit are connected in series between the second terminal of the first current control unit and the first terminal of the light-emitting module. The second light-emitting control unit is connected between the first power line and the first terminal of the first driving unit. The control terminal of the second light-emitting control unit is connected to a second light-emitting control signal line.

19. 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 terminal of the time control module. The second data writing unit is used to write the time data signal to the control terminal of the second driving unit. The third initialization unit is connected between the third initialization signal line and the control terminal of the second driving unit. The control terminal of the third initialization unit is connected to the third scan line. The second storage unit is connected between the third power line and the control terminal of the second driving unit. The coupling unit is connected to the control terminal of the second driving unit, and the coupling unit is used to control the potential of the control terminal of the second driving unit according to the frequency sweep signal.

20. The pixel circuit according to claim 19, characterized in that, The time control module further includes a second compensation unit, which is connected between the control terminal and the second terminal of the second drive unit. The control terminal of the second compensation unit and the control terminal of the second data writing unit are both connected to the fourth scan line.

21. The pixel circuit according to claim 20, characterized in that, The time control module further includes a third light-emitting control unit and a fourth light-emitting control unit. The control terminals of the third and fourth light-emitting control units are both connected to the second light-emitting control signal line. The first terminal of the third light-emitting control unit is connected to the third power supply line. The second terminal of the third light-emitting control unit is connected to the first terminal of the second driving unit. The first terminal of the fourth light-emitting control unit is connected to the second terminal of the second driving unit. The second terminal of the fourth light-emitting control unit is connected to the output terminal of the time control module.

22. The pixel circuit according to claim 21, characterized in that, The time control module further includes a fourth initialization unit, the control terminal of which is connected to the third scan line, and the fourth initialization unit is connected between the fourth initialization signal line and the output terminal of the time control module.

23. A driving method for a pixel circuit, characterized in that, The pixel circuit includes a time control module, a current control module, a light-emitting module, and a temperature control module. The current control module and the light-emitting module are connected between a first power line and a second power line. The temperature control module is connected to the control terminal of the current control module. The temperature control module includes a first control unit and a second control unit. The first control terminal of the first control unit is connected to a first potential control signal line, and the second control terminal is connected to a reference voltage signal line. The first control terminal of the second control unit is connected to a second potential control signal line, and the second control terminal is connected to the output terminal of the first control unit. The driving method for the pixel circuit includes: During 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 terminal of the current control module according to the time data signal and the frequency sweep signal to control the light-emitting time of the light-emitting module. When the temperature of the light-emitting module exceeds the preset temperature, the temperature control module is controlled to turn off the current control module. Specifically, the first control unit controls the potential of its output terminal 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; and the second control unit controls the potential of the control terminal of the current control module based on the potential of the output terminal of the first control unit and the second potential control signal on the second potential control signal line.

24. A display panel, characterized in that, Includes the pixel circuit as described in any one of claims 1-22.

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