Pixel circuit, driving method thereof and display panel

Abstract

Embodiments of the present application disclose a pixel circuit, 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 brightness compensation module. The current control module is configured to control a driving current on a connection path between a first power line and a second power line. The time control module is configured to control a potential of a control terminal of the current control module according to a time data signal and a sweep signal, so as to control a light emitting time of the light emitting module. The brightness compensation module is connected with the time control module and the current control module respectively, and is configured to adjust the driving current and / or the light emitting time according to a light emitting brightness of the light emitting module. The technical scheme provided by the embodiments of the present application detects the light emitting brightness through the brightness compensation module, and adjusts the driving current and / or the light emitting time through the brightness compensation module when the light emitting brightness is lower than a preset brightness, so as to increase the light emitting brightness, ensure the stability and uniformity of the light emitting brightness, and improve the display quality.

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 the display quality of the display panel.

[0005] According to one aspect of the present invention, a pixel circuit is provided, comprising: a timing control module, a current control module, a light-emitting module, and a brightness compensation 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 driving current on the connection path between the first power line and the second power line.

[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 brightness compensation module is connected to the time control module and the current control module respectively. The brightness compensation module is used to adjust the driving current and / or the light emission time according to the light emission brightness of the light emission module.

[0009] Optionally, the current control module includes a current control unit and a first drive unit, wherein the first drive unit and the current control unit are connected in series, and the control terminal of the current control unit serves as the control terminal of the current control module.

[0010] The first output terminal of the brightness compensation module is connected to the reset terminal of the time control module. The time control module is also used to transmit a first voltage to the control terminal of the current control module according to the valid signal connected to its own reset terminal, so as to turn on the current control unit.

[0011] The second output terminal of the brightness compensation module is connected to the control terminal of the first driving unit, and the first driving unit is used to generate the driving current according to the voltage signal input to its own control terminal.

[0012] Optionally, the first voltage is an adjustable voltage.

[0013] Optionally, the brightness compensation module includes a brightness detection unit, a first feedback output unit, and a second feedback output unit;

[0014] The output terminal of the brightness detection unit is connected to the control terminal of the first feedback output unit. The brightness detection unit is used to generate a first control signal when the luminous brightness is detected to be less than a preset brightness.

[0015] The input terminal of the first feedback output unit is connected to the first power line, and the output terminal of the first feedback output unit is connected to the reset terminal of the time control module and the control terminal of the second feedback output unit respectively. The first feedback output unit is used to output a second control signal in response to the first control signal.

[0016] The input terminal of the second feedback output unit is connected to the compensation signal line, and the output terminal of the second feedback output unit is connected to the control terminal of the first drive unit. The second feedback output unit is used to transmit the compensation voltage on the compensation signal line to the control terminal of the first drive unit in response to the second control signal. The time control module is used to transmit the first voltage to the control terminal of the current control unit in response to the second control signal.

[0017] Optionally, the brightness compensation module further includes a first reset unit, the control terminal of the first reset unit is connected to a first reset signal line, the first reset unit is connected between the control terminal of the first feedback output unit and the first power line, and the first reset unit is used to reset the control terminal of the first feedback output unit.

[0018] Optionally, the first feedback output unit includes a first output control subunit and a comparison subunit; the control terminal of the first output control subunit serves as the control terminal of the first feedback output unit, the input terminal of the first output control subunit serves as the input terminal of the first feedback output unit, the output terminal of the first output control subunit is connected to the first input terminal of the comparison subunit, the second input terminal of the comparison subunit is connected to a reference voltage, and the output terminal of the comparison subunit serves as the output terminal of the first feedback output unit.

[0019] Optionally, the first feedback output unit further includes a selection subunit, the control terminal of the selection subunit is connected to the selection signal line, the input terminal of the selection subunit is connected to the output terminal of the first output control subunit, and the output terminal of the selection subunit is connected to the first input terminal of the comparison subunit. The selection subunit is used to control whether the brightness compensation module in the pixel circuit of a row is turned on according to the selection signal transmitted on the selection signal line.

[0020] Optionally, the brightness detection unit includes a photosensitive device, the first output control subunit includes a first transistor, the selection subunit includes a second transistor, the comparison subunit includes a comparator and a first capacitor, and the first reset unit includes a third transistor.

[0021] The gate of the third transistor is connected to the first reset signal line, the first terminal of the third transistor is connected to the first power supply line, the first terminal of the photosensitive device is connected to the second power supply line, the second terminals of the photosensitive device and the third transistor are both connected to the gate of the first transistor, the first terminal of the first transistor is connected to the first power supply line, the second terminal of the first transistor is connected to the first terminal of the second transistor, the second terminal of the second transistor is connected to the first input terminal of the comparator, the gate of the first transistor is connected to the selection signal line, the second input terminal of the comparator is connected to the reference voltage, the output terminal of the comparator is connected to the reset terminal of the time control module and the control terminal of the second feedback output unit, the first terminal of the first capacitor is connected to the second power supply line, and the second terminal of the first capacitor is connected to the first input terminal of the comparator.

[0022] Optionally, the second feedback output unit includes a second output control subunit and a first coupling subunit. The control terminal of the second output control subunit serves as the control terminal of the second feedback output unit, and the input terminal of the second output control subunit serves as the input terminal of the second feedback output unit. The output terminal of the second output control subunit is connected to the first terminal of the first coupling subunit, and the second terminal of the first coupling subunit serves as the output terminal of the second feedback output unit. The second output control subunit is used to transmit the compensation voltage to the first terminal of the first coupling subunit in response to the second control signal. The first coupling subunit is used to couple voltage information associated with the compensation voltage to the control terminal of the first drive unit.

[0023] Optionally, the second output control subunit includes a fourth transistor, the first coupling subunit includes a second capacitor, the gate of the fourth transistor is connected to the output terminal of the first feedback output unit, the first terminal of the fourth transistor is connected to the compensation signal line, the second terminal of the fourth transistor is connected to the first terminal of the second capacitor, and the second terminal of the second capacitor is connected to the control terminal of the first driving unit.

[0024] Optionally, the current control module further includes a first data writing unit and a first storage 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.

[0025] Optionally, the current control module further includes a first compensation unit, which is connected between the second end of the first driving unit and the control end. 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.

[0026] 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 current control unit and the first terminal of the light-emitting module. The second terminal of the light-emitting module is connected to the second power line. 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 the second light-emitting control signal line. The second terminal of the first driving unit is connected to the first terminal of the current control unit.

[0027] 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 of the first initialization unit 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.

[0028] Optionally, the first initialization signal line is multiplexed as the second initialization signal line.

[0029] Optionally, the time control module includes a second driving unit, a second data writing unit, a second coupling subunit, and a second storage unit;

[0030] 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 connected to the second driving unit and is used to write the time data signal to the control terminal of the second driving unit. The second storage unit is connected between the third power line and the control terminal of the second driving unit. The first terminal of the second coupling subunit is connected to the sweep frequency signal, and the second terminal of the second coupling subunit is connected to the control terminal of the second driving unit. The second coupling subunit is used to control the potential of the control terminal of the second driving unit according to the sweep frequency signal.

[0031] 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 third scan line. The first terminal of the second data writing unit is connected to the time data signal, and the second terminal of the second data writing unit is connected to the first terminal of the second drive unit.

[0032] 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.

[0033] Optionally, the time control module further includes a third initialization unit and a fourth initialization 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 first scan line. The control terminal of the fourth initialization unit serves as the reset terminal of the time control module and is connected to the second reset signal line and the first output terminal of the brightness compensation module. The fourth initialization unit is connected between the fourth initialization signal line and the output terminal of the time control module. The fourth initialization signal line is used to transmit the first voltage.

[0034] Optionally, the time control module further includes a fifth initialization unit, the control terminal of which is connected to the first scan line, the first terminal of which is connected to the fifth initialization signal line, and the second terminal of which is connected to the first terminal of the second coupling subunit.

[0035] Optionally, the pixel circuit further includes a voltage shaping module, which is connected between the output terminal of the time control module and the control terminal of the current control module. The voltage shaping module is used to adjust the voltage output by the output terminal of the time control module.

[0036] Optionally, the voltage shaping module includes a third capacitor, and a first inverter and a second inverter connected in series. The input terminal of the first inverter is connected to the output terminal of the time control module, the output terminal of the second inverter is connected to the control terminal of the current control module, and the third capacitor is connected to the control terminal of the current control module.

[0037] According to another aspect of the present invention, a driving method for a pixel circuit is provided, the pixel circuit including a timing control module, a current control module, a light emission module, and a brightness compensation module;

[0038] The driving method for the pixel circuit includes:

[0039] 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 generate a driving current, thereby controlling the light-emitting module to emit light. The time control module is also 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, thereby controlling the light-emitting time of the light-emitting module.

[0040] When the brightness compensation module detects that the brightness of the light-emitting module is less than the preset brightness, it controls the brightness compensation module to adjust the driving current and / or the light-emitting time according to the brightness.

[0041] Optionally, the brightness compensation module includes a brightness detection unit, a first feedback output unit, and a second feedback output unit; the current control module includes a current control unit and a first drive unit; the first drive unit and the current control unit are connected in series; and the control terminal of the current control unit serves as the control terminal of the current control module.

[0042] When the brightness compensation module detects that the brightness of the light-emitting module is less than a preset brightness, controlling the brightness compensation module to adjust the driving current and / or the light-emitting time according to the brightness includes:

[0043] When the brightness detection unit detects that the brightness of the light-emitting module is less than the preset brightness, it controls the brightness detection unit to generate a first control signal, controls the first feedback output unit to output a second control signal in response to the first control signal, controls the time control module to turn on the current control unit in response to the second control signal to adjust the light emission time, and / or controls the second output feedback unit to control the voltage at the control terminal of the first driving unit in response to the second control signal to adjust the driving current.

[0044] 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.

[0045] The technical solution provided in this embodiment of the invention sets up a brightness compensation module connected to the time control module and the current control module respectively. During the light emission process of the light-emitting module, the brightness of the light emission is detected by the brightness compensation module. When the brightness of the light emission is lower than the preset brightness, the driving current and / or the light emission time are adjusted by the brightness compensation module to increase the brightness of the light emission. This can maintain the brightness of the light emission within the target brightness range, ensure the stability and uniformity of the brightness of the light emission, and help improve the display quality.

[0046] 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

[0047] 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.

[0048] Figure 1 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0051] Figure 4 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0052] Figure 5 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0053] Figure 6 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0054] Figure 7 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0055] Figure 8 This is a schematic diagram of the structure of a current control module provided in an embodiment of the present invention;

[0056] Figure 9 This is a schematic diagram of the structure of a time control module provided in an embodiment of the present invention;

[0057] Figure 10 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention;

[0058] Figure 11 A schematic diagram of the driving timing of a pixel circuit provided in an embodiment of the present invention;

[0059] Figure 12 A flowchart illustrating a pixel circuit driving method provided in an embodiment of the present invention;

[0060] Figure 13 A flowchart of another pixel circuit driving method provided in an embodiment of the present invention;

[0061] Figure 14 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 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 1The pixel circuit provided in this embodiment of the invention includes: a time control module 10, a current control module 20, a light-emitting module 30, and a brightness compensation module 40. The current control module 20 and the light-emitting module 30 are connected between a first power line L1 and a second power line L2. The current control module 20 is used to control the driving current on the connection path between the first power line L1 and the second power line L2. 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-emitting module 30. The brightness compensation module 40 is connected to the time control module 10 and the current control module 20 respectively. The brightness compensation module 40 is used to adjust the driving current and / or the light emission time according to the light emission brightness of the light-emitting module 30.

[0065] 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 connected, and the current control module 20 generates a driving current to drive the light-emitting module 30 to emit 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.

[0066] The light-emitting module 30 typically includes light-emitting diodes. During actual screen operation, prolonged light emission can cause the light-emitting diodes to heat up, the backplane wiring to heat up, and the ambient temperature to rise, thereby reducing the luminous efficiency of the light-emitting diodes and consequently reducing the brightness, which affects the display quality.

[0067] In this embodiment, a brightness detection and feedback mechanism is introduced. The brightness compensation module 40 detects the brightness of the light-emitting module 30 in real time and can adjust the driving current and / or light-emitting time of the pixel circuit according to the brightness, thereby compensating for the decrease in brightness and maintaining the stability of brightness.

[0068] It should be noted that during the illumination period of the light-emitting module 30, when the detected illumination brightness is lower than the preset brightness, the brightness compensation module 40 can adjust the driving current of the pixel circuit to increase the brightness, or adjust the illumination time to increase the brightness, or adjust the driving current and illumination time at the same time to quickly increase the brightness.

[0069] The technical solution provided in this embodiment of the invention sets up a brightness compensation module 40 connected to the time control module 10 and the current control module 20 respectively. During the light emission process of the light emission module 30, the brightness of the light emission is detected by the brightness compensation module 40. When the light emission brightness is lower than the preset brightness, the brightness compensation module 40 adjusts the driving current and / or the light emission time to increase the light emission brightness. This can maintain the light emission brightness within the target brightness range, ensure the stability and uniformity of the light emission brightness, and help improve the display quality.

[0070] Figure 2 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 2 Based on the above embodiments, optionally, the current control module 20 includes a current control unit 202 and a first drive unit 201, the first drive unit 201 and the current control unit 202 are connected in series, and the control terminal of the current control unit 202 serves as the control terminal of the current control module 20; the first output terminal OUT1 of the brightness compensation module 40 is connected to the reset terminal of the time control module 10, and the time control module 10 is also used to transmit a first voltage V1 to the control terminal of the current control module 20 according to the valid signal input to its own reset terminal, so as to turn on the current control unit 202; the second output terminal OUT2 of the brightness compensation module 40 is connected to the control terminal of the first drive unit 201, and the first drive unit 201 is used to generate a drive current according to the voltage signal input to its own control terminal.

[0071] Specifically, when the luminous brightness decreases, the brightness compensation module 40 responds to the current luminous brightness by transmitting a control signal to the reset terminal of the time control module 10 to control the time control module 10 to adjust the luminous time of the luminous module 30, and transmits another control signal to the control terminal of the first driving unit 201 in the current control module 20 to control the current control module 20 to adjust the driving current of the luminous module 30, thereby increasing the luminous brightness.

[0072] Optionally, in this embodiment, the first voltage V1 is an adjustable voltage. Since the output terminal of the time control module 10 is connected to the control terminal of the current control unit 202, the conduction degree of the current control unit 202 can be adjusted by adjusting the first voltage V1, thereby adjusting the magnitude of the driving current. This can effectively reduce the phenomenon of further reduction in light brightness caused by the temperature rise due to the increase in driving current, and prevent the system from falling into a dead loop.

[0073] Figure 3 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 3Based on the above embodiments, optionally, the brightness compensation module 40 includes a brightness detection unit 401, a first feedback output unit 402, and a second feedback output unit 403. The output terminal of the brightness detection unit 401 is connected to the control terminal of the first feedback output unit 402. The brightness detection unit 401 is used to generate a first control signal when the detected luminous brightness is less than a preset brightness. The input terminal of the first feedback output unit 402 is connected to the first power line L1. The output terminal of the first feedback output unit 401 is connected to the reset terminal of the time control module 10 and the control terminal of the second feedback output unit 403, respectively. The first feedback output unit 402 is used to output a second control signal in response to the first control signal. The input terminal of the second feedback output unit 403 is connected to the compensation signal line. The output terminal of the second feedback output unit 403 is connected to the control terminal of the first drive unit 201. The second feedback output unit 403 is used to transmit the compensation voltage Vcom on the compensation signal line to the control terminal of the first drive unit 201 in response to the second control signal. The time control module 10 is used to transmit the first voltage V1 to the control terminal of the current control unit 202 in response to the second control signal.

[0074] Specifically, the brightness detection unit 401 may include a photosensitive device to generate a corresponding control signal by sensing the brightness of the light-emitting module 30. For example, when the brightness detection unit 401 detects that the brightness is lower than a preset brightness, it outputs a first control signal to the control terminal of the first feedback output unit 402. The first feedback output unit 402 responds to the first control signal by outputting a second control signal. The time control module 10 responds to the second control signal by transmitting a first voltage V1 to the control terminal of the current control unit 202, extending the conduction time of the current control unit 202, thereby increasing the light-emitting time. At the same time, the second feedback output unit 403 responds to the second control signal by transmitting a compensation voltage Vcom to the control terminal of the first driving unit 201, increasing the driving current generated by the first driving unit 201, thereby increasing the brightness of the light-emitting module 30.

[0075] Optionally, the adjustment of the drive current can be controlled by configuring the magnitude of the compensation voltage Vcom. For example, if the compensation voltage Vcom is configured to be lower than the threshold voltage of the first drive unit 201, the first drive unit 201 will not be turned on, thus preventing the adjustment of the drive current; if the compensation voltage Vcom is configured to be higher than the threshold voltage of the first drive unit 201, the first drive unit 201 will be turned on, generating a drive current based on the compensation voltage Vcom, thereby achieving the purpose of adjusting the drive current.

[0076] Figure 4 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 4Optionally, based on the above embodiments, the brightness compensation module 40 further includes a first reset unit 404. The control terminal of the first reset unit 404 is connected to a first reset signal line, which is used to transmit a first reset signal RE1. The first reset unit 404 is connected between the control terminal of the first feedback output unit 402 and the first power line L1. The first reset unit 404 is used to reset the control terminal of the first feedback output unit 402 to prevent the first feedback output unit 402 from being turned on before the light-emitting module 30 emits light, so as to affect normal light emission.

[0077] Continue to refer to Figure 4 The first feedback output unit 402 includes a first output control subunit 4021 and a comparison subunit 4022. The control terminal of the first output control subunit 4021 serves as the control terminal of the first feedback output unit 402, and the input terminal of the first output control subunit 4021 serves as the input terminal of the first feedback output unit 402. The output terminal of the first output control subunit 4021 is connected to the first input terminal of the comparison subunit 4022, the second input terminal of the comparison subunit 4022 is connected to the reference voltage Vr, and the output terminal of the comparison subunit 4022 serves as the output terminal of the first feedback output unit 402.

[0078] Specifically, when the brightness detection unit 401 outputs the first control signal, the first output control subunit 4021 responds to the first control signal and turns on, transmitting the first power supply voltage VDDA to the first input terminal of the comparison subunit 4022. The comparison subunit 4022 generates a second control signal based on the first power supply voltage VDDA and the reference voltage Vr to control the operation of the second feedback output unit 403 and the time control module 10, thereby compensating for the light emission brightness and improving the display quality.

[0079] Figure 5 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 5 Optionally, based on the above embodiments, the first feedback output unit 402 further includes a selection subunit 4023. The control terminal of the selection subunit 4023 is connected to the selection signal line, which is used to transmit the selection signal SEL. The input terminal of the selection subunit 4023 is connected to the output terminal of the first output control subunit 4021, and the output terminal of the selection subunit 4023 is connected to the first input terminal of the comparison subunit 4022. The selection subunit 4023 is used to control whether the brightness compensation module 40 in the row pixel circuit is turned on according to the selection signal SEL transmitted on the selection signal line.

[0080] The technical solution provided in this embodiment, by setting a selection subunit 4023 on the connection path between the first output control subunit 4021 and the comparison subunit 4022, can select whether the brightness compensation function of a certain row or several rows of pixel circuits is enabled, which can compensate for the light emission brightness in a targeted manner and help reduce power consumption.

[0081] The selection signal SEL remains at a constant level. For example, when brightness compensation is required, the selection signal SEL can be kept at a low level, and the selection sub-unit 4023 is turned on; when brightness compensation is not required, the selection signal SEL can be kept at a high level, and the selection sub-unit 4023 is turned off.

[0082] 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 embodiments, optionally, the second feedback output unit 403 includes a second output control subunit 4031 and a first coupling subunit 4032. The control terminal of the second output control subunit 4031 serves as the control terminal of the second feedback output unit 403, and the input terminal of the second output control subunit 4031 serves as the input terminal of the second feedback output unit 403. The output terminal of the second output control subunit 4031 is connected to the first terminal of the first coupling subunit 4032, and the second terminal of the first coupling subunit 4032 serves as the output terminal of the second feedback output unit 403. The second output control subunit 4031 is used to transmit the compensation voltage Vcom to the first terminal of the first coupling subunit 4032 in response to the second control signal. The first coupling subunit 4032 is used to couple the voltage information associated with the compensation voltage Vcom to the control terminal of the first drive unit 201. Here, the first coupling subunit 4032 is used to write the compensation voltage Vcom into the control terminal of the first driving unit 201 in a coupling manner. This can reduce the distortion of the compensation voltage Vcom during transmission, ensure the accuracy of voltage transmission, and at the same time realize the voltage matching function to meet the input voltage requirements of the first driving unit 201, which is beneficial to improving the compatibility of the circuit.

[0083] Figure 7 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 7 Based on the above embodiments, optionally, the pixel circuit further includes a voltage shaping module 50, which is connected between the output terminal of the time control module 10 and the control terminal G1 of the current control module 20. The voltage shaping module 50 is used to adjust the voltage output by the output terminal of the time control module 10.

[0084] Specifically, the voltage shaping 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 control terminal G1 of the current control module 20. Therefore, even if the time control module 10 experiences instability in its time control signal due to leakage, the voltage shaping module 50 can still stabilize the potential of the control terminal G1 of the current control module 20 at the off-state voltage. Here, the off-state voltage can be any voltage that can turn off the current control module 20, preventing instability such as potential decay at the control terminal G1 of the current control module 20. This ensures that the current control module 20 can quickly turn off when the light emission ends, reducing the attenuation of the driving current caused by the instability of the control terminal potential of the current control module 20. This improves the difference in driving current between different pixels, enhances the uniformity of the driving current, effectively avoids differences in the light emission time between different pixels, and is beneficial to improving the display effect.

[0085] Figure 8 This is a schematic diagram of a current control module provided in an embodiment of the present invention, with reference to... Figure 8 Based on the above embodiments, the current control module 20 may optionally include a first data writing unit 203 and a first storage unit 204. The first data writing unit 203 is connected to the first driving unit 201. The first data writing unit 203 is used to write the current data signal Vdata_I to the control terminal of the first driving unit 201. The first storage unit 204 is connected between the first power line L1 and the control terminal of the first driving unit 201.

[0086] Optionally, the current control module 20 further includes a first compensation unit 205, which is connected between the second terminal and the control terminal of the first drive unit 201. Both the control terminal of the first compensation unit 205 and the control terminal of the first data writing unit 203 are 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 205 is used to compensate for the threshold voltage of the first drive unit 201 to improve the problem of poor uniformity of the drive current caused by changes in the threshold voltage of the first drive unit 201. Here, the first data writing unit 203 is connected to the first terminal of the first drive unit 201.

[0087] Optionally, the current control module 20 further includes a first light-emitting control unit 207 and a second light-emitting control unit 206. The control terminal of the first light-emitting control unit 207 is connected to a first light-emitting control signal line. The first light-emitting control unit 207 is connected between the second terminal of the current control unit 202 and the first terminal of the light-emitting module 30. The second terminal of the light-emitting module 30 is connected to a second power line L2. The second light-emitting control unit 206 is connected between the first power line L1 and the first terminal of the first driving unit 201. The control terminal of the second light-emitting control unit 206 is connected to a second light-emitting control signal line. The second terminal of the first driving unit 201 is connected to the first terminal of the current control unit 202. The first light-emitting control signal line is used to transmit a first light-emitting control signal EM1, and the second light-emitting control signal line is used to transmit a second light-emitting control signal EM2. In this embodiment, the second light-emitting control unit 206 is used to disconnect the connection between the first power line L1 and the first driving unit 201 during the non-light-emitting phase to prevent the first power supply voltage VDDA from interfering with the current data signal Vdata_I when it is transmitted to the first terminal of the first driving unit 201, thus affecting the light-emitting quality.

[0088] Optionally, the current control module 20 further includes a first initialization unit 208 and a second initialization unit 209. The control terminal of the first initialization unit 208 is connected to the second scan line, the first terminal of the first initialization unit 208 is connected to the first initialization signal line, and the second terminal of the first initialization unit 208 is connected to the control terminal of the first driving unit 201. The control terminal of the second initialization unit 209 is connected to the second scan line, and the second initialization unit 209 is connected between the second initialization signal line and the first terminal of the light-emitting module 30. The second scan line is used to transmit the second scan signal S2, the first initialization unit 208 is used to transmit the first initialization voltage Vinit1, and the second initialization signal line is used to transmit the second initialization voltage Vinit2.

[0089] Optionally, in other embodiments, the first initialization signal line can be reused as the second initialization signal line to save the number of signal lines and improve PPI.

[0090] Figure 9 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 9Based on the above embodiments, optionally, the time control module 10 includes a second driving unit 101, a second data writing unit 102, a second coupling subunit 103, and a second storage unit 104. 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 connected to the second driving unit 101 and is used to write the time data signal Vdata_t to the control terminal of the second driving unit 101. The second storage unit 104 is connected between the third power line L3 and the control terminal of the second driving unit 101. The first terminal of the second coupling subunit 103 is connected to the sweep frequency signal SWEEP, and the second terminal of the second coupling subunit 103 is connected to the control terminal of the second driving unit 101. The second coupling subunit 103 is used to control the potential of the control terminal of the second driving unit 101 according to the sweep frequency signal SWEEP.

[0091] Optionally, the time control module 10 further includes a fifth initialization unit 110. The control terminal of the fifth initialization unit 110 is connected to the first scan line, the first terminal of the fifth initialization unit 110 is connected to the fifth initialization signal line, and the second terminal of the fifth initialization unit 110 is connected to the first terminal of the second coupling subunit 103. The fifth initialization unit 110 is used to transmit the fifth initialization voltage Vinit5 transmitted on the fifth initialization signal line to the first terminal of the second coupling subunit 103. 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 can be maintained across the second coupling subunit 103. During the light emission stage, the current control module 20 can generate a driving current according to the voltage state of its control terminal to drive the light emission module 30 to emit light. The frequency sweep signal SWEEP is used to scan the signal from high level to low level or from low level to high level during the light emission stage, so as to control the voltage of the output terminal of the time control module 10, thereby controlling the voltage of the control terminal G1 of the current control module 20, and then controlling the working state (on or off) of the current control module 20, so as to control the light emission time of the light emission module 30.

[0092] 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 third scan line to respond to the third scan signal S3 transmitted on the third scan line. The first terminal of the second data writing unit 102 is connected to the time data signal Vdata_t, and the second terminal of the second data writing unit 102 is connected to the first terminal of the second drive unit 101.

[0093] Optionally, the time control module 10 further 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, and the second terminal of the fourth light-emitting control unit 107 is connected to the output terminal of the time control module 10.

[0094] The time control module 10 also includes a third initialization unit 108 and a fourth initialization unit 109. The third initialization unit 108 is connected between the third initialization signal line and the control terminal of the second driving unit 101, and its control terminal is connected to the first scan line. The control terminal of the fourth initialization unit 109 serves as the reset terminal of the time control module 10 and is connected to the second reset signal line and the first output terminal OUT1 of the brightness compensation module 40, respectively. The fourth initialization unit 109 is connected between the fourth initialization signal line and the output terminal of the time control module 10. The fourth initialization signal line is used to transmit the first voltage V1. The second reset signal line is used to transmit the second reset signal RE2.

[0095] 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 embodiments, optionally, the brightness detection unit 401 includes a photosensitive device D2, the first output control subunit 4021 includes a first transistor M1, the selection subunit 4023 includes a second transistor M2, the comparison subunit 4022 includes a comparator OC and a first capacitor C1, the first reset unit 404 includes a third transistor M3, the gate of the third transistor M3 is connected to a first reset signal line, the first terminal of the third transistor M3 is connected to a first power supply line L1, the first terminal of the photosensitive device D2 is connected to a second power supply line L2, and the second terminals of the photosensitive device D2 and the third transistor M3 are both connected to... The gate of the first transistor M1 is connected to the first power supply line L1, the second terminal of the first transistor M1 is connected to the first terminal of the second transistor M2, the second terminal of the second transistor M2 is connected to the first input terminal of the comparator OC, the gate of the first transistor M1 is connected to the selection signal line, the second input terminal of the comparator OC is connected to the reference voltage Vr, the output terminal of the comparator OC is connected to the reset terminal of the time control module 10 and the control terminal of the second feedback output unit 403, the first terminal of the first capacitor C1 is connected to the second power supply line L2, and the second terminal of the first capacitor C1 is connected to the first input terminal of the comparator OC.

[0096] The second output control subunit 4031 includes a fourth transistor M4, the first coupling subunit 4032 includes a second capacitor C2, the gate of the fourth transistor M4 is connected to the output terminal of the first feedback output unit 402, the first terminal of the fourth transistor M4 is connected to the compensation signal line, the second terminal of the fourth transistor M4 is connected to the first terminal of the second capacitor C2, and the second terminal of the second capacitor C2 is connected to the control terminal of the first driving unit 201.

[0097] The first driving unit 201 includes a fifth transistor M5, the current control unit 202 includes a sixth transistor M6, the first data writing unit 203 includes a seventh transistor M7, the first compensation unit 205 includes an eighth transistor M8, the second light-emitting control unit 206 includes a ninth transistor M9, the first light-emitting control unit 207 includes a tenth transistor M10, the first initialization unit 208 includes an eleventh transistor M11, the second initialization unit 209 includes a twelfth transistor M12, and the first storage unit 204 includes a sixth capacitor C6. The light-emitting module 30 includes a light-emitting diode D1, which can be an LED, OLED, Micro LED, or Mini LED.

[0098] The voltage shaping module 50 includes a third capacitor C3, and a first inverter I1 and a second inverter I2 connected in series. The input terminal of the first inverter I1 is connected to the output terminal of the time control module 10, the output terminal of the second inverter I2 is connected to the control terminal G1 of the current control module 20, and the third capacitor C3 is connected to the control terminal G1 of the current control module 20.

[0099] The second driving unit 101 includes a thirteenth transistor M13, the second data writing unit 102 includes a fourteenth transistor M14, the second compensation unit 105 includes a fifteenth transistor M15, the second coupling subunit 103 includes a fourth capacitor C4, the second storage unit 104 includes a fifth capacitor C5, the third light-emitting control unit 106 includes a sixteenth transistor M16, the fourth light-emitting control unit 107 includes a seventeenth transistor M17, the third initialization unit 108 includes an eighteenth transistor M18, the fourth initialization unit 109 includes a nineteenth transistor M19, and the fifth initialization unit 110 includes a twentieth transistor M20. The specific connection relationships between the transistors are as follows: Figure 10 As shown.

[0100] Figure 11 This is a driving timing diagram of a pixel circuit provided in an embodiment of the present invention, which can be applied to... Figure 10The pixel circuit shown, taking all transistors as P-type transistors as an example, includes the following working process: voltage writing stage T1, reset stage T2 and light emission stage T3. The voltage writing stage T1 includes initialization stage t1, first data writing stage t2 and second data writing stage t3.

[0101] 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 first reset signal line is configured to transmit a low-level first reset signal RE1, the second reset signal line is configured to transmit a high-level second reset signal RE2, 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 third transistor M3, the eleventh transistor M11, and the twelfth transistor M12 are turned on. The third transistor M3 transmits the first power supply voltage VDDA to the control terminal of the first transistor M1 to turn off the first transistor M1. The eleventh transistor M11 and the twelfth transistor M12 respectively transmit the second initialization voltage Vinit2 from the second initialization signal line to the gate of the fifth transistor M5 and the first terminal of the light-emitting diode D1, thereby initializing the gate of the fifth transistor M5 and the first terminal of the light-emitting diode D1.

[0102] In the first data writing stage 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 high-level third scan signal S3, the first reset signal line is configured to transmit a high-level first reset signal RE1, the second reset signal line is configured to transmit a high-level second reset signal RE2, 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 seventh transistor M7, the eighth transistor M8, the eighteenth transistor M8, and the twentieth transistor M20 are turned on. The current data signal Vdata_I is written to the gate of the fifth transistor M5 via the seventh transistor M7, the fifth transistor M5, and the eighth transistor M8. The gate potential of the fifth transistor M5 is Vdata_I + Vth5, and it is stored in the sixth capacitor C6, where Vth5 is the threshold voltage of the fifth transistor M5, achieving threshold compensation for the fifth transistor M5.

[0103] The third initialization voltage Vinit3 transmitted on the third initialization signal line is transmitted to the gate of the thirteenth transistor M13 via the eighteenth transistor M18, thus initializing the gate potential of the thirteenth transistor M13 and turning it on. Simultaneously, the fifth initialization voltage Vinit5 on the fifth initialization signal line is transmitted to the first terminal of the fourth capacitor C4 via the twentieth transistor M20, thus initializing the first terminal of the fourth capacitor C4.

[0104] In the second data writing 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 low-level third scan signal S3, the first reset signal line is configured to transmit a high-level first reset signal RE1, the second reset signal line is configured to transmit a high-level second reset signal RE2, 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 fourteenth transistor M14 and the fifteenth transistor M15 are turned on. The time data signal Vdata_t is transmitted through the fourteenth transistor M14, the thirteenth transistor M13, and the fifteenth transistor M15 to the gate of the thirteenth transistor M13. When the gate potential of the thirteenth transistor M13 reaches Vdata_t + Vth13, the thirteenth transistor M13 is turned off, and the fifth capacitor C5 stores the gate voltage of the thirteenth transistor M13. Here, Vth13 is the threshold voltage of the thirteenth transistor M13. The voltage difference across the fourth capacitor C4 remains constant.

[0105] In this embodiment, during the threshold compensation process of the thirteenth transistor M13, setting the seventeenth transistor M17 can improve the phenomenon of unstable gate potential of the thirteenth transistor M13 caused by the leakage current of the nineteenth transistor M19, which is beneficial to improving the accuracy of the time control signal output by the time control module 10.

[0106] 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.

[0107] 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 first reset signal line is configured to transmit a high-level first reset signal RE1, the second reset signal line is configured to transmit a low-level second reset signal RE2, 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 nineteenth transistor M19 is turned on, and the first voltage V1 on the fourth initialization signal line is transmitted to the gate of the sixth transistor M6 via the nineteenth transistor M19, the first inverter I1, and the second inverter I2, initializing the gate of the sixth transistor M6 and turning it on. By setting the first inverter I1 and the second inverter I2, the voltage shaping module 50 can quickly pull the gate voltage of the sixth transistor M6 to the voltage of the output of the time control module 10, ensuring that the voltage shaping module 50 does not change the polarity of the signal at the output of the time control module 10, so that the current control module 20 can be quickly turned off or turned on.

[0108] 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 first reset signal line is configured to transmit a high-level first reset signal RE1, the second reset signal line is configured to transmit a high-level second reset signal RE2, 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 ninth transistor M9, the tenth transistor M10, the sixteenth transistor M16, and the seventeenth transistor M17 are turned on. The first power supply voltage VDDA on the first power supply line L1 is transmitted to the first terminal of the fifth transistor M5. The fifth transistor M5 generates a driving current under the control of its gate voltage, driving the light-emitting diode D1 to emit light.

[0109] 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 thirteenth transistor M13 changes synchronously. When the potential of the gate of the thirteenth transistor M13 causes it to conduct, the third power supply voltage VDDW is transmitted to the input terminal of the voltage shaping module 50 through the sixteenth transistor M16, the thirteenth transistor M13, and the seventeenth transistor M17. After the inversion effect of the first inverter I1 and the second inverter I2, the voltage shaping 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 third capacitor C3 can maintain the stability of the gate potential of the sixth transistor M6, so that the sixth transistor M6 is turned off quickly.

[0110] During the light emission process, when the photosensitive device D2 detects that the brightness of the light-emitting diode D1 is lower than the preset brightness, the photosensitive device D2 controls the first transistor M1 to turn on. The first power supply voltage VDDA is transmitted to the first input terminal of the comparator OC through the first transistor M1 and the second transistor M2, charging the first capacitor C1. The voltage at the first input terminal of the comparator OC is greater than the voltage at its second input terminal, and the comparator OC outputs a low-level signal (first control signal). The fourth transistor M4 and the nineteenth transistor M19 remain on. The compensation voltage Vcom is transmitted to the first terminal of the second capacitor C2 through the fourth transistor M4. Through the coupling effect of the second capacitor C2, the voltage information associated with the compensation voltage Vcom is written to the gate of the fifth transistor M5, increasing the driving current generated by the fifth transistor M5 (here, the compensation voltage Vcom is less than the voltage of the current data signal Vdata_I). Simultaneously, the first voltage V1 is transmitted to the gate of the sixth transistor M6 via the nineteenth transistor M19, the first inverter I1, and the second inverter I2 (the nineteenth transistor M19 has a strong pull-down capability, which can pull the gate voltage of the sixth transistor M6 down to the first voltage V1), extending the conduction time of the sixth transistor M6, thereby extending the light-emitting time. By increasing the driving current of the light-emitting diode D1 and extending the light-emitting time, the brightness loss of the light-emitting diode D1 can be compensated, so that the light-emitting brightness is stabilized at the target brightness, improving the display stability and uniformity.

[0111] It should be noted that in this embodiment, when the photosensitive device D2 detects the luminance of the light-emitting diode D1, a small change in luminance results in a weak current generated by the photosensitive device D2. Consequently, the conduction level of the first transistor M1 is low, preventing the voltage at the first input terminal of the comparator OC from exceeding the reference voltage Vr. This also prevents the fourth transistor M4 from conducting, thus failing to compensate for the luminance change. Therefore, the driving current and luminance duration can be controlled by adjusting the conduction level of the first transistor M1 and the charging level of the first capacitor C1.

[0112] 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 12 This is a flowchart of a pixel circuit driving method provided in an embodiment of the present invention, combined with... Figure 12 and Figure 1 Specifically, the driving method for this pixel circuit includes:

[0113] S110. During the light-emitting stage, the control current control module connects the connection path between the first power line and the second power line to generate a driving current to control the light-emitting module to emit light. The control time control module controls 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.

[0114] S120. When the brightness compensation module detects that the brightness of the light-emitting module is less than the preset brightness, it controls the brightness compensation module to adjust the driving current and / or the light-emitting time according to the brightness.

[0115] The technical solution provided in this embodiment of the invention sets up a brightness compensation module 40 connected to the time control module 10 and the current control module 20 respectively. During the light emission process of the light emission module 30, the brightness of the light emission is detected by the brightness compensation module 40. When the light emission brightness is lower than the preset brightness, the brightness compensation module 40 adjusts the driving current and / or the light emission time to increase the light emission brightness. This can maintain the light emission brightness within the target brightness range, ensure the stability and uniformity of the light emission brightness, and help improve the display quality.

[0116] Figure 13 A flowchart of another pixel circuit driving method provided in an embodiment of the present invention, in conjunction with... Figure 13 and Figure 2 ,

[0117] S110. During the light-emitting stage, the control current control module connects the connection path between the first power line and the second power line to generate a driving current to control the light-emitting module to emit light. The control time control module controls 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.

[0118] S1201. When the brightness detection unit detects that the brightness of the light-emitting module is less than the preset brightness, it controls the brightness detection unit to generate a first control signal, controls the first feedback output unit to respond to the first control signal to output a second control signal, and controls the time control module to respond to the second control signal to turn on the current control unit to adjust the light-emitting time, and / or controls the second output feedback unit to respond to the second control signal to control the voltage of the control terminal of the first drive unit to adjust the drive current.

[0119] The specific working process of the pixel circuit driving method provided in this embodiment can be referred to the relevant descriptions in the above embodiments, which have the same beneficial effects, and will not be repeated here.

[0120] 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 14 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 14 The mobile phone panel shown can also be a display panel in tablets, mobile phones, watches, wearable devices, and electronic devices such 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.

[0121] 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.

[0122] 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 brightness compensation 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 driving current on the connection path between the first power line and the second power line. 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 brightness compensation module is connected to the time control module and the current control module respectively. The brightness compensation module is used to adjust the driving current and / or the light emission time according to the light emission brightness of the light emission module.

2. The pixel circuit according to claim 1, characterized in that, The current control module includes a current control unit and a first drive unit, the first drive unit and the current control unit are connected in series, and the control terminal of the current control unit serves as the control terminal of the current control module. The first output terminal of the brightness compensation module is connected to the reset terminal of the time control module. The time control module is also used to transmit a first voltage to the control terminal of the current control module according to the valid signal connected to its own reset terminal, so as to turn on the current control unit. The second output terminal of the brightness compensation module is connected to the control terminal of the first driving unit, and the first driving unit is used to generate the driving current according to the voltage signal input to its own control terminal. Preferably, the first voltage is an adjustable voltage.

3. The pixel circuit according to claim 2, characterized in that, The brightness compensation module includes a brightness detection unit, a first feedback output unit, and a second feedback output unit. The output terminal of the brightness detection unit is connected to the control terminal of the first feedback output unit. The brightness detection unit is used to generate a first control signal when the luminous brightness is detected to be less than a preset brightness. The input terminal of the first feedback output unit is connected to the first power line, and the output terminal of the first feedback output unit is connected to the reset terminal of the time control module and the control terminal of the second feedback output unit respectively. The first feedback output unit is used to output a second control signal in response to the first control signal. The input terminal of the second feedback output unit is connected to the compensation signal line, and the output terminal of the second feedback output unit is connected to the control terminal of the first drive unit. The second feedback output unit is used to transmit the compensation voltage on the compensation signal line to the control terminal of the first drive unit in response to the second control signal. The time control module is used to transmit the first voltage to the control terminal of the current control unit in response to the second control signal. Preferably, the brightness compensation module further includes a first reset unit, the control terminal of the first reset unit is connected to a first reset signal line, the first reset unit is connected between the control terminal of the first feedback output unit and the first power line, and the first reset unit is used to reset the control terminal of the first feedback output unit.

4. The pixel circuit according to claim 3, characterized in that, The first feedback output unit includes a first output control subunit and a comparison subunit; The control terminal of the first output control subunit serves as the control terminal of the first feedback output unit, the input terminal of the first output control subunit serves as the input terminal of the first feedback output unit, the output terminal of the first output control subunit is connected to the first input terminal of the comparison subunit, the second input terminal of the comparison subunit is connected to a reference voltage, and the output terminal of the comparison subunit serves as the output terminal of the first feedback output unit. Preferably, the first feedback output unit further includes a selection subunit, the control terminal of the selection subunit is connected to the selection signal line, the input terminal of the selection subunit is connected to the output terminal of the first output control subunit, and the output terminal of the selection subunit is connected to the first input terminal of the comparison subunit. The selection subunit is used to control whether the brightness compensation module in the pixel circuit of a row is turned on according to the selection signal transmitted on the selection signal line. Preferably, the brightness detection unit includes a photosensitive device, the first output control subunit includes a first transistor, the selection subunit includes a second transistor, the comparison subunit includes a comparator and a first capacitor, and the first reset unit includes a third transistor; The gate of the third transistor is connected to the first reset signal line, the first terminal of the third transistor is connected to the first power supply line, the first terminal of the photosensitive device is connected to the second power supply line, the second terminals of the photosensitive device and the third transistor are both connected to the gate of the first transistor, the first terminal of the first transistor is connected to the first power supply line, the second terminal of the first transistor is connected to the first terminal of the second transistor, the second terminal of the second transistor is connected to the first input terminal of the comparator, the gate of the first transistor is connected to the selection signal line, the second input terminal of the comparator is connected to the reference voltage, the output terminal of the comparator is connected to the reset terminal of the time control module and the control terminal of the second feedback output unit, the first terminal of the first capacitor is connected to the second power supply line, and the second terminal of the first capacitor is connected to the first input terminal of the comparator.

5. The pixel circuit according to claim 3, characterized in that, The second feedback output unit includes a second output control subunit and a first coupling subunit. The control terminal of the second output control subunit serves as the control terminal of the second feedback output unit, and the input terminal of the second output control subunit serves as the input terminal of the second feedback output unit. The output terminal of the second output control subunit is connected to the first terminal of the first coupling subunit, and the second terminal of the first coupling subunit serves as the output terminal of the second feedback output unit. The second output control subunit is used to transmit the compensation voltage to the first terminal of the first coupling subunit in response to the second control signal. The first coupling subunit is used to couple voltage information associated with the compensation voltage to the control terminal of the first drive unit. Preferably, the second output control subunit includes a fourth transistor, the first coupling subunit includes a second capacitor, the gate of the fourth transistor is connected to the output terminal of the first feedback output unit, the first terminal of the fourth transistor is connected to the compensation signal line, the second terminal of the fourth transistor is connected to the first terminal of the second capacitor, and the second terminal of the second capacitor is connected to the control terminal of the first driving unit.

6. The pixel circuit according to claim 2, characterized in that, The current control module further includes a first data writing unit and a first storage 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. Preferably, the current control module further includes a first compensation unit, which is connected between the second 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. Preferably, 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 current control unit and the first terminal of the light-emitting module. The second terminal of the light-emitting module is connected to the second power line. 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 the second light-emitting control signal line. The second terminal of the first driving unit is connected to the first terminal of the current control unit. Preferably, 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 of the first initialization unit 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. Preferably, the first initialization signal line is multiplexed as the second initialization signal line.

7. The pixel circuit according to claim 2, characterized in that, The time control module includes a second driving unit, a second data writing unit, a second coupling subunit, 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 connected to the second driving unit and is used to write the time data signal to the control terminal of the second driving unit. The second storage unit is connected between the third power line and the control terminal of the second driving unit. The first terminal of the second coupling subunit is connected to the sweep frequency signal, and the second terminal of the second coupling subunit is connected to the control terminal of the second driving unit. The second coupling subunit is used to control the potential of the control terminal of the second driving unit according to the sweep frequency signal. Preferably, 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 third scan line. The first terminal of the second data writing unit is connected to the time data signal, and the second terminal of the second data writing unit is connected to the first terminal of the second drive unit. Preferably, 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 light-emitting control unit and the fourth light-emitting control unit 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. Preferably, the time control module further includes a third initialization unit and a fourth initialization 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 first scan line. The control terminal of the fourth initialization unit serves as the reset terminal of the time control module and is connected to the second reset signal line and the first output terminal of the brightness compensation module. The fourth initialization unit is connected between the fourth initialization signal line and the output terminal of the time control module. The fourth initialization signal line is used to transmit the first voltage. Preferably, the time control module further includes a fifth initialization unit, the control terminal of the fifth initialization unit is connected to the first scan line, the first terminal of the fifth initialization unit is connected to the fifth initialization signal line, and the second terminal of the fifth initialization unit is connected to the first terminal of the second coupling subunit; Preferably, the pixel circuit further includes a voltage shaping module, which is connected between the output terminal of the time control module and the control terminal of the current control module. The voltage shaping module is used to adjust the voltage output by the output terminal of the time control module. Preferably, the voltage shaping module includes a third capacitor, and a first inverter and a second inverter connected in series. The input terminal of the first inverter is connected to the output terminal of the time control module, the output terminal of the second inverter is connected to the control terminal of the current control module, and the third capacitor is connected to the control terminal of the current control module.

8. A driving method for a pixel circuit, characterized in that, The pixel circuit includes a time control module, a current control module, a light emission module, and a brightness compensation module; 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 generate a driving current, thereby controlling the light-emitting module to emit light. The time control module is also 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, thereby controlling the light-emitting time of the light-emitting module. When the brightness compensation module detects that the brightness of the light-emitting module is less than the preset brightness, it controls the brightness compensation module to adjust the driving current and / or the light-emitting time according to the brightness.

9. The driving method for the pixel circuit according to claim 8, characterized in that, The brightness compensation module includes a brightness detection unit, a first feedback output unit, and a second feedback output unit. The current control module includes a current control unit and a first drive unit. The first drive unit and the current control unit are connected in series. The control terminal of the current control unit serves as the control terminal of the current control module. When the brightness compensation module detects that the brightness of the light-emitting module is less than a preset brightness, controlling the brightness compensation module to adjust the driving current and / or the light-emitting time according to the brightness includes: When the brightness detection unit detects that the brightness of the light-emitting module is less than the preset brightness, it controls the brightness detection unit to generate a first control signal, controls the first feedback output unit to output a second control signal in response to the first control signal, and controls the time control module to turn on the current control unit in response to the second control signal to adjust the light emission time, and / or controls the second feedback output unit to control the voltage at the control terminal of the first driving unit in response to the second control signal to adjust the driving current.

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

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