A pixel driving circuit and a driving method thereof

Abstract

The present invention discloses a pixel driving circuit and a driving method thereof. The pixel driving circuit comprises: a driving module, a data writing module, an adjusting module and a light emitting module; the data writing module is used to write the received data voltage signal into the first end of the driving module; the adjusting module is electrically connected to the first end of the driving module, and the adjusting module is used to adjust and reset the potential of the first end of the driving module during the data holding stage; the second end of the driving module is connected to the light emitting module, and the driving module is used to generate a driving current according to the data voltage signal, and the light emitting module is used to respond to the driving current and emit light. The technical solution of the embodiment of the present invention improves the flickering problem of the display panel when displaying high, medium and low grayscales, and achieves a stable display effect.

Description

Technical Field

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

[0002] With the development of display technology, the display requirements for display panels are getting higher and higher.

[0003] The pixel circuit leakage current of the existing display panel is relatively large, so that the display panel has a flickering problem during display and cannot display stably. Summary of the invention

[0004] The present invention provides a pixel driving circuit and a driving method thereof to solve the problem of flickering of a display panel during display.

[0005] According to one aspect of the present invention, a pixel driving circuit is provided, the pixel driving circuit comprising: a driving module, a data writing module, a regulating module and a light emitting module;

[0006] The data writing module is used to write the received data voltage signal into the first end of the driving module;

[0007] The regulating module is electrically connected to the first end of the driving module, and the regulating module is used to regulate and reset the potential of the first end of the driving module in the data holding stage;

[0008] The second end of the driving module is connected to the light emitting module. The driving module is used to generate a driving current according to the data voltage signal. The light emitting module is used to respond to the driving current and emit light.

[0009] In the data holding stage, the regulating module adjusts the potential of the first end of the driving module, and the first end of the driving module can be reset; the driving module is turned on in the data holding stage, and the second end of the driving module can be reset at the same time, thereby reducing the change of the driving current and improving the flickering problem of the display panel during display.

[0010] Optionally, the adjustment module includes a first adjustment unit;

[0011] The control end of the first regulating unit is connected to the first scanning signal, the first end of the first regulating unit is connected to the second scanning signal, the second end of the first regulating unit is electrically connected to the first end of the driving module, and the first regulating unit is used to write the second scanning signal into the first end of the driving module according to the first scanning signal.

[0012] The first regulating unit writes the second scanning signal into the first end of the driving module, which can adjust the potential of the first end of the driving module, reset the first end and the second end of the regulating module, reduce the change of the driving current, and improve the flickering problem of the display panel during display.

[0013] Optionally, the first regulating unit includes a first transistor, a first end of the first transistor is the first end of the first regulating unit, a second end of the first transistor is the second end of the first regulating unit, and a control end of the first transistor is the control end of the first regulating unit.

[0014] The first scanning signal can control the first transistor to be turned on, and the first transistor writes the second scanning signal into the first end of the driving module to adjust the potential of the first end of the driving module.

[0015] Optionally, the adjustment module includes a second adjustment unit;

[0016] The first end of the second regulating unit is connected to the first scanning signal, the second end of the second regulating unit is electrically connected to the first end of the driving module, and the second regulating unit is used to increase the potential of the first end of the driving module.

[0017] When the first scanning signal is at a high level, the second regulating unit may couple the first scanning signal to the first end of the driving module, and may increase the potential of the first end of the driving module.

[0018] Optionally, the second adjustment unit includes a first capacitor;

[0019] The first end of the first capacitor is the first end of the second adjusting unit, and the second end of the first capacitor is the second end of the second adjusting unit.

[0020] When the first scanning signal is at a high level, the first capacitor can couple the first scanning signal to the first end of the driving module, thereby increasing the potential of the first end of the driving module.

[0021] Optionally, the adjustment module includes a third adjustment unit;

[0022] The control end of the third regulating unit is connected to the first scanning signal, the first end of the third regulating unit is connected to the first power signal, the second end of the third regulating unit is electrically connected to the first end of the driving module, and the third regulating unit is used to increase the potential of the first end of the driving module.

[0023] The third regulating unit can write the first power supply signal into the first end of the driving module to increase the potential of the first end of the driving module; and at different grayscales, the potential of the first end of the driving module remains consistent, so that the full grayscale picture remains consistent.

[0024] Optionally, the third regulating unit includes a second transistor;

[0025] The first end of the second transistor is the first end of the third regulating unit, the second end of the second transistor is the second end of the third regulating unit, and the control end of the second transistor is the control end of the third regulating unit.

[0026] The second transistor can write the first power supply signal into the first end of the driving module to increase the potential of the first end of the driving module; and at different grayscales, the potential of the first end of the driving module remains consistent, so that the full grayscale picture remains consistent.

[0027] Optionally, the pixel driving circuit further includes: a threshold compensation module, a first initialization module, a second initialization module, a first light emitting control module, a second light emitting control module and a storage module;

[0028] The control end of the data writing module is connected to the third scanning signal, the first end of the data writing module is connected to the data voltage signal, and the second end of the data writing module is electrically connected to the first end of the driving module;

[0029] The control end of the threshold compensation module is connected to a scanning signal with a polarity opposite to that of the third scanning signal, the first end of the threshold compensation module is electrically connected to the second end of the driving module, and the second end of the threshold compensation module is electrically connected to the control end of the driving module, so as to capture the threshold voltage of the driving module to the control end of the driving module;

[0030] The control end of the first initialization module receives the fourth scanning signal, the first end of the first initialization module receives the first initialization signal, the second end of the first initialization module is electrically connected to the control end of the driving module, and the first initialization module is used to initialize the control end of the driving module;

[0031] The control end of the second initialization module is connected to the first scanning signal, the first end of the second initialization module is connected to the second initialization signal, the second end of the second initialization module is electrically connected to the first end of the light emitting module, and the second initialization module is used to initialize the light emitting module;

[0032] The control end of the first light-emitting control module is connected to a first enable signal, the first end of the first light-emitting control module is connected to a first power signal, and the second end of the first light-emitting control module is electrically connected to the first end of the driving module;

[0033] The control end of the second light emitting control module is connected to the second enable signal, the first end of the second light emitting control module is electrically connected to the second end of the driving module, and the second end of the second light emitting control module is electrically connected to the first end of the light emitting module;

[0034] The second end of the light emitting module is connected to a second power signal;

[0035] The first end of the storage module is electrically connected to the control end of the driving module, the second end of the storage module is connected to the first power signal, and the storage module is used to maintain the potential of the control end of the driving module.

[0036] The regulating module and the second initializing module share the first scanning signal, which can reduce the number of scanning lines, and is beneficial to simplifying the layout design and reducing the cost.

[0037] According to another aspect of the present invention, a driving method of a pixel driving circuit is provided, and the driving method of the pixel driving circuit includes:

[0038] In the data writing stage, the data writing module writes the received data voltage signal into the driving module;

[0039] In the data holding stage, the regulating module regulates and resets the potential of the first end of the driving module;

[0040] In the light-emitting stage, the driving module generates a driving current according to the data voltage signal, and the light-emitting module responds to the driving current and emits light.

[0041] In the data holding stage, the regulating module adjusts the potential of the first end of the driving module, and the first end of the driving module can be reset; the driving module is turned on in the data holding stage, and the second end of the driving module can be reset at the same time, thereby reducing the change of the driving current and improving the flickering problem of the display panel during display.

[0042] Optionally, before the data writing phase, it also includes:

[0043] In the initialization stage, the regulating module regulates the potential of the first end of the driving module.

[0044] In the initialization stage, the regulating module regulates the potential of the first end of the driving module, which can further reset the first end and the second end of the driving module, further reduce the change of the driving current, and improve the flickering problem of the display panel during display.

[0045] The technical solution of the embodiment of the present invention, the pixel driving circuit includes: a driving module, a data writing module, an adjustment module and a light-emitting module; in the data holding stage, the adjustment module can write an adjustment voltage to the first end of the driving module, adjust the potential of the first end of the driving module, and reset the first end of the driving module; and, since the driving module is turned on in the data holding stage, the second end of the driving module can be reset at the same time. For example, in low-frequency driving, the data holding stage lasts for a long time, and the driving module is in a conducting state for a long time, so that the driving module is biased for a long time, resulting in the characteristic drift of the driving module, and the generated driving current is unstable; by writing an adjustment voltage to the first end of the driving module in the data holding stage by the adjustment module, adjusting the potential of the first end of the driving module, the first end and the second end of the driving module can be reset, and the bias state of the driving module can be adjusted, so that the driving module generates a stable driving current, and the change of the driving current is reduced, thereby improving the flickering problem of the display panel when displaying high, medium and low grayscales, and improving the display effect. Furthermore, the regulating module can also regulate the potential of the first end of the driving module during the initialization phase, and write the same regulating potential to the driving module when displaying different grayscales, so that when displaying different grayscales, the initialization effect can be guaranteed to be consistent, and different driving currents corresponding to different grayscales can be avoided, so that the display effects of different grayscales remain consistent. The technical solution of the embodiment of the present invention solves the problem of flickering of the display panel during display and the problem of inability to display stably, and achieves the effect of stable display.

[0046] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 is a structural schematic diagram of a pixel driving circuit provided by an embodiment of the present invention;

[0049] Figure 2 is a structural schematic diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0050] Figure 3 is a structural schematic diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0051] Figure 4is a structural schematic diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0052] Figure 5 is a flow chart of a driving method of a pixel driving circuit provided by an embodiment of the present invention;

[0053] Figure 6 is a timing diagram corresponding to a driving method of a pixel driving circuit provided by an embodiment of the present invention;

[0054] Figure 7 is a timing diagram corresponding to another driving method of a pixel driving circuit provided by an embodiment of the present invention;

[0055] Figure 8 is a flow chart of another driving method of a pixel driving circuit provided by an embodiment of the present invention;

[0056] Fig. 9 is a timing diagram corresponding to another driving method of a pixel driving circuit provided by an embodiment of the present invention;

[0057] Fig.10 This is a timing diagram corresponding to another driving method of a pixel driving circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0059] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the term "comprising" and any variation thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0060] As mentioned in the background technology, the pixel circuit leakage current of the existing display panel is relatively large, which causes the display panel to flicker during display and cannot display stably. After careful research, the applicant found that the reason for this technical problem is that when driven at a low frequency, the leakage current of the driving transistor of the pixel circuit is relatively large, the gate voltage of the driving transistor cannot be maintained for a long time, and the unstable gate voltage causes the generated driving current to be unstable, so that the display panel flickers during display.

[0061] In view of the above problems, an embodiment of the present invention provides a pixel driving circuit. Figure 1 is a schematic diagram of a pixel driving circuit provided by an embodiment of the present invention, with reference to Figure 1 The pixel driving circuit includes: a driving module 101, a data writing module 102, an adjustment module 103 and a light emitting module 105; the data writing module 102 is used to write the received data voltage signal Vdata into the first end of the driving module 101; the adjustment module 103 is electrically connected to the first end N1 of the driving module 101, and the adjustment module 103 is used to adjust and reset the potential of the first end N1 of the driving module 101 during the data holding stage; the second end of the driving module 101 is connected to the light emitting module 105, the driving module 101 is used to generate a driving current according to the data voltage signal Vdata, and the light emitting module 105 is used to respond to the driving current and emit light.

[0062] Among them, in the data writing stage, the data writing module 102 can write the data voltage signal Vdata into the driving module 101; in the light-emitting stage, the driving module 101 can generate a corresponding driving current according to the data voltage signal Vdata, and the light-emitting module 105 is, for example, an organic light-emitting diode (OLED), and the light-emitting module 105 can emit light in response to the driving current to display the brightness to be displayed.

[0063] Specifically, the data holding stage is a stage between the data writing stage and the light emitting stage. In the data holding stage, the regulating module 103 can write the regulating voltage to the first terminal N1 of the driving module 101, adjust the potential of the first terminal N1 of the driving module 101, and reset the first terminal N1 of the driving module 101; and, since the driving module 101 is turned on in the data holding stage, the second terminal of the driving module 101 can be reset at the same time. For example, in low-frequency driving, the data holding stage lasts for a long time, and the driving module 101 is in the on state for a long time, so that the driving module 101 is biased for a long time, resulting in the characteristic drift of the driving module 101, and the generated driving current is unstable; by writing the regulating voltage to the first terminal N1 of the driving module 101 in the data holding stage by the regulating module 103, adjusting the potential of the first terminal N1 of the driving module 101, the first terminal N1 and the second terminal of the driving module 101 can be reset, and the bias state of the driving module 101 can be adjusted, so that the driving module 101 generates a stable driving current, thereby improving the display effect. Exemplarily, the regulating voltage written by the regulating module 103 may be a high-level voltage or a low-level voltage, which may be specifically determined according to actual conditions; for example, when the light-emitting module 105 is displayed at high brightness for a long time, the voltage at the control end of the driving module 101 is relatively low, resulting in a large voltage difference between the control end of the driving module 101 and the first end N1, in which case a low-level voltage may be written to the first end of the driving module 101 to reduce the voltage difference between the control end of the driving module 101 and the first end N1, thereby reducing the change in the driving current and improving the flickering problem during high grayscale display; when the light-emitting module 105 is displayed at low brightness for a long time, the voltage at the control end of the driving module 101 is relatively high, resulting in a large voltage difference between the control end and the second end of the driving module 101, in which case a high-level voltage may be written to the first end of the driving module 101 to reduce the voltage difference between the control end and the second end of the driving module 101, thereby reducing the change in the driving current and improving the flickering problem during low grayscale display, thereby improving the flickering problem of the display panel during high, medium and low grayscale display.

[0064] In addition, the adjustment module 103 can also adjust the potential of the first terminal N1 of the driving module 101 during the initialization stage, and write the same adjustment potential to the driving module 101 when displaying different gray scales, so that when displaying different gray scales, the initialization effect can be guaranteed to be consistent, and different driving currents corresponding to different gray scales can be avoided, so that the display effects of different gray scales remain consistent, and the flickering problem of the display panel when displaying high, medium and low gray scales is improved.

[0065] The technical solution of this embodiment, the pixel driving circuit includes: a driving module, a data writing module, an adjustment module and a light-emitting module; in the data holding stage, the adjustment module can write an adjustment voltage to the first end of the driving module, adjust the potential of the first end of the driving module, and reset the first end of the driving module; and, since the driving module is turned on in the data holding stage, the second end of the driving module can be reset at the same time. For example, in low-frequency driving, the data holding stage lasts for a long time, and the driving module is in a conducting state for a long time, so that the driving module is biased for a long time, resulting in the characteristic drift of the driving module, and the generated driving current is unstable; by writing an adjustment voltage to the first end of the driving module in the data holding stage by the adjustment module, adjusting the potential of the first end of the driving module, the first end and the second end of the driving module can be reset, and the bias state of the driving module can be adjusted, so that the driving module generates a stable driving current, and the change of the driving current is reduced, thereby improving the flickering problem of the display panel when displaying high, medium and low grayscales, and improving the display effect. Furthermore, the regulating module can also regulate the potential of the first end of the driving module during the initialization phase, and write the same regulating potential to the driving module when displaying different grayscales, so that when displaying different grayscales, the initialization effect can be guaranteed to be consistent, and the driving currents corresponding to different grayscales can be avoided to be different, so that the display effects of different grayscales are kept consistent. The technical solution of this embodiment solves the problem of flickering of the display panel during display and the problem of inability to display stably, and achieves the effect of stable display.

[0066] Figure 2 is a schematic diagram of a structure of another pixel driving circuit provided by an embodiment of the present invention. Figure 2 The regulating module 103 includes a first regulating unit 1031; the control end of the first regulating unit 1031 is connected to the first scanning signal Scan1, the first end of the first regulating unit 1031 is connected to the second scanning signal Scan2, the second end of the first regulating unit 1031 is electrically connected to the first end N1 of the driving module 101, and the first regulating unit 1031 is used to write the second scanning signal Scan2 into the first end N1 of the driving module according to the first scanning signal Scan1.

[0067] Specifically, the first scanning signal Scan1 can control the on and off of the first regulating unit 1031; when the first scanning signal Scan1 controls the first regulating unit 1031 to be turned on, the first regulating unit 1031 can write the second scanning signal Scan2 into the first terminal N1 of the driving module 101, thereby adjusting the potential of the first terminal N1 of the driving module 101 and resetting the first terminal N1 of the driving module 101. The second scan signal Scan2 can be determined according to specific circuit requirements. For example, when the light emitting module 105 is displayed at high brightness for a long time, the voltage of the control terminal of the driving module 101 is relatively low, resulting in a large voltage difference between the control terminal of the driving module 101 and the first terminal N1. The second scan signal Scan2 can be a low-level voltage. The first adjustment unit 1031 writes the low-level voltage to the first terminal N1 of the driving module 101, which can reduce the voltage difference between the control terminal of the driving module 101 and the first terminal N1, thereby reducing the change of the driving current and improving the flickering problem during high grayscale display; when the light emitting module 105 is displayed at low brightness for a long time, the voltage of the control terminal of the driving module 101 is relatively high, resulting in a large voltage difference between the control terminal and the second terminal of the driving module 101. The second scan signal Scan2 can be a high level, and the first adjustment unit 1031 can write a high-level voltage to the first terminal of the driving module 101, reduce the voltage difference between the control terminal and the second terminal of the driving module 101, reduce the change of the driving current, improve the flickering problem during low grayscale display, and thus improve the flickering problem of the display panel during high, medium and low grayscale display.

[0068] Optionally, continue to refer to Figure 2 The first regulating unit 1031 includes a first transistor T1, a first end of the first transistor T1 is the first end of the first regulating unit 1031, a second end of the first transistor T1 is the second end of the first regulating unit 1031, and a control end of the first transistor T1 is the control end of the first regulating unit 1031.

[0069] Specifically, the first adjustment unit 1031 includes, for example, a first transistor T1, which is, for example, a P-type transistor. In the data holding stage, the first scan signal Scan1 may be a low-level signal to control the first transistor T1 to be turned on, and the first transistor T1 may write the second scan signal Scan2 into the first terminal N1 of the driving module 101, thereby adjusting the potential of the first terminal N1 of the driving module 101 and resetting the first terminal N1 of the driving module 101. It should be noted that, in some other embodiments, the first transistor T1 may also be other types of transistors, which are not limited here.

[0070] Figure 3 is a schematic diagram of a structure of another pixel driving circuit provided by an embodiment of the present invention. Figure 3The regulating module 103 includes a second regulating unit 1032 ; a first end of the second regulating unit 1032 is connected to the first scanning signal Scan1 , a second end of the second regulating unit 1032 is electrically connected to the first end of the driving module 101 , and the second regulating unit 1032 is used to increase the potential of the first end N1 of the driving module 101 .

[0071] Specifically, the adjustment module 103 may also include a second adjustment unit 1032, and the second adjustment unit 1032 may couple the first scanning signal Scan1 to the first end N1 of the driving module 101. For example, when the light-emitting module 105 is displayed at low brightness for a long time, the control end voltage of the driving module 101 is relatively high, resulting in a large voltage difference between the control end and the second end of the driving module 101. When the first scanning signal Scan1 is at a high level, the second adjustment unit 1032 couples the first scanning signal Scan1 to the first end N1 of the driving module 101, which can increase the potential of the first end N1 of the driving module 101, thereby reducing the voltage difference between the control end and the second end of the driving module 101, reducing the change of the driving current, and improving the flicker problem during low grayscale display.

[0072] Optionally, continue to refer to Figure 3 The second regulating unit 1032 includes a first capacitor C1; a first end of the first capacitor C1 is a first end of the second regulating unit 1032, and a second end of the first capacitor C1 is a second end of the second regulating unit 1032.

[0073] Specifically, the second regulating unit 1032 includes, for example, a first capacitor C1, which can couple the first scan signal Scan1 to the first terminal N1 of the driving module 101. When the first scan signal Scan1 is at a high level, the high level signal can be coupled to the first terminal N1 of the driving module 101.

[0074] Figure 4 is a schematic diagram of a structure of another pixel driving circuit provided by an embodiment of the present invention. Figure 4 The regulating module 103 includes a third regulating unit 1033; the control end of the third regulating unit 1033 is connected to the first scan signal Scan1, the first end of the third regulating unit 1033 is connected to the first power signal VDD, the second end of the third regulating unit 1033 is electrically connected to the first end N1 of the driving module 101, and the third regulating unit 1033 is used to increase the potential of the first end N1 of the driving module 101.

[0075] Specifically, the regulating module 103 may also include a third regulating unit 1033, the control end of the third regulating unit 1033 is connected to the first scanning signal Scan1, and the first scanning signal Scan1 can control the conduction and shutdown of the third regulating unit 1033; when the first scanning signal Scan1 controls the third regulating unit 1033 to be turned on, the third regulating unit 1033 can write the first power signal VDD into the first end N1 of the driving module 101, thereby increasing the potential of the first end N1 of the driving module 101; for example, when the light-emitting module 105 is displayed at low brightness for a long time, the control end voltage of the driving module 101 is relatively high, resulting in a large voltage difference between the control end and the second end of the driving module 101. The third regulating unit 1033 writes the first power signal VDD into the first end N1 of the driving module 101, which can increase the potential of the first end N1 of the driving module 101, thereby reducing the voltage difference between the control end and the second end of the driving module 101, reducing the change of the driving current, and improving the flickering problem during low grayscale display. Furthermore, the potential of the first terminal N1 of the driving module 101 can be kept consistent when displaying different grayscales, thereby avoiding the problem of display difference caused by inconsistent potential of the first terminal N1 of the driving module 101 under high, medium and low brightness, thereby making the full grayscale picture consistent, which is beneficial to improving the display effect.

[0076] Optionally, continue to refer to Figure 4 The third regulating unit 1033 includes a second transistor T2; the first end of the second transistor T2 is the first end of the third regulating unit 1033, the second end of the second transistor T2 is the second end of the third regulating unit 1033, and the control end of the second transistor T2 is the control end of the third regulating unit 1033.

[0077] Specifically, the third adjustment unit 1033, for example, includes a second transistor T2, and the second transistor T2 is, for example, a P-type transistor. When the first scan signal Scan1 is at a low level, the second transistor T2 can be controlled to be turned on, so that the second transistor T2 can write the first power supply signal VDD into the first terminal N1 of the driving module 101, thereby increasing the potential of the first terminal of the driving module 101; and when different gray scales are displayed, the potential of the first terminal N1 of the driving module 101 can be kept consistent, thereby making the full gray scale picture consistent, which is beneficial to improving the display effect.

[0078] It should be noted that, in some other implementations, the second transistor T2 may also be other types of transistors, which are not limited here.

[0079] Optionally, refer to Figure 2 , Figure 3 or Figure 4The pixel driving circuit further includes: a threshold compensation module 104, a first initialization module 106, a second initialization module 107, a first light-emitting control module 108, a second light-emitting control module 109 and a storage module 110; the control end of the data writing module 102 is connected to the third scanning signal Scan3, the first end of the data writing module 102 is connected to the data voltage signal Vdata, and the second end of the data writing module 102 is electrically connected to the first end N1 of the driving module 101; the control end of the threshold compensation module 104 is connected to the scanning signal S with a polarity opposite to the third scanning signal Scan3 can3', the first end of the threshold compensation module 104 is electrically connected to the second end of the driving module 101, and the second end of the threshold compensation module 104 is electrically connected to the control end of the driving module 101, so as to capture the threshold voltage of the driving module 101 to the control end of the driving module 101; the control end of the first initialization module 106 is connected to the fourth scanning signal Scan4, the first end of the first initialization module 106 is connected to the first initialization signal Vref1, the second end of the first initialization module 106 is electrically connected to the control end of the driving module 101, and the first initialization module 106 is used to initialize the control end of the driving module 101; the control end of the second initialization module 107 is connected to the first scanning signal Scan1, the first end of the second initialization module 107 is connected to the second initialization signal Vref2, the second end of the second initialization module 107 is electrically connected to the first end of the light-emitting module 105, and the second initialization module 107 is used to initialize the light-emitting module 105; the control end of the first light-emitting control module 108 is connected to the first enable signal EM1, the first end of the first light-emitting control module 108 is connected to the first power supply signal VDD, and the second end of the first light-emitting control module 108 is connected to the driving module 101 The first end N1 of the storage module 110 is electrically connected to the control end of the driving module 101, and the second end of the storage module 110 is connected to the first power signal VDD. The storage module 110 is used to maintain the potential of the control end of the driving module 101.

[0080] Specifically, refer to Figure 2 , Figure 3 or Figure 4The driving module 101 includes a third transistor T3, a first end N1 of the third transistor T3 is the first end N1 of the driving module 101, a second end of the third transistor T3 is the second end of the driving module 101, a control end of the third transistor T3 is the control end of the driving module 101, and the third transistor T3 is, for example, a P-type transistor. The data writing module 102 includes a fourth transistor T4, a first end of the fourth transistor T4 is the first end of the data writing module 102, a second end of the fourth transistor T4 is the second end of the data writing module 102, a control end of the fourth transistor T4 is the control end of the data writing module 102, and the fourth transistor T4 is, for example, a P-type transistor. When the third scanning signal Scan3 is at a low level, the fourth transistor T4 can be controlled to be turned on, and the fourth transistor T4 can write the data voltage signal Vdata into the first end N1 of the driving module 101. The threshold compensation module 104 includes a fifth transistor T5, the control end of the fifth transistor T5 is the control end of the threshold compensation module 104, the first end of the fifth transistor T5 is the first end of the threshold compensation module 104, the second end of the fifth transistor T5 is the second end of the threshold compensation module 104, and the fifth transistor T5 is, for example, an N-type transistor, which can reduce the leakage current of the driving module 101; the control end of the fifth transistor T5 is connected to the scanning signal Scan3', and the scanning signal Scan3' is, for example, a signal with a polarity opposite to the third scanning signal. When the third scanning signal Scan3 is at a low level, the scanning signal Scan3' is at a high level, and the fifth transistor T5 is controlled to be turned on, and the fifth transistor T5 performs threshold compensation, that is, data writing and threshold compensation can be performed simultaneously. The light-emitting module 105 includes an organic light-emitting diode D1, and the organic light-emitting diode D1 can emit light in response to the driving current. The first initialization module 106 includes a sixth transistor T6, the control end of the sixth transistor T6 is the control end of the first initialization module 106, the first end of the sixth transistor T6 is the first end of the first initialization module 106, the second end of the sixth transistor T6 is the second end of the first initialization module 106, the sixth transistor T6 is, for example, an N-type transistor, which can further reduce the leakage current of the driving module 101; the control end of the sixth transistor T6 is connected to the fourth scanning signal Scan4, and when the fourth scanning signal Scan4 is at a high level, the sixth transistor T6 can be turned on. The second initialization module 107 includes a seventh transistor T7, the control end of the seventh transistor T7 is the control end of the second initialization module 107, the first end of the seventh transistor T7 is the first end of the second initialization module 107, the second end of the seventh transistor T7 is the second end of the second initialization module 107, the seventh transistor T7 is, for example, a P-type transistor, the control end of the seventh transistor T7 is connected to the first scanning signal Scan1, and when the first scanning signal Scan1 is at a low level, the seventh transistor T7 can be controlled to be turned on.The first light-emitting control module 108 includes an eighth transistor T8, the control end of the eighth transistor T8 is the control end of the first light-emitting control module 108, the first end of the eighth transistor T8 is the first end of the first light-emitting control module 108, the second end of the eighth transistor T8 is the second end of the first light-emitting control module 108, the eighth transistor T8 is, for example, a P-type transistor, and when the first enable signal EM1 is at a low level, the eighth transistor T8 can be controlled to be turned on. The second light-emitting control module 109 includes a ninth transistor T9, the control end of the ninth transistor T9 is the control end of the second light-emitting control module 109, the first end of the ninth transistor T9 is the first end of the second light-emitting control module 109, the second end of the ninth transistor T9 is the second end of the second light-emitting control module 109, the ninth transistor T9 is, for example, a P-type transistor, and when the second enable signal EM2 is at a low level, the ninth transistor T9 can be controlled to be turned on. The storage module 110 includes a second capacitor C2, the first end of the second capacitor C2 is the first end of the storage module 110, and the second end of the second capacitor C2 is the second end of the storage module 110. It should be noted that in some other implementations, the transistor may also be of other types, and the type of the transistor may be determined based on actual conditions and is not limited here.

[0081] In addition, the regulating module 103 and the second initializing module 107 share the first scanning signal Scan1 , which can reduce the number of scanning lines, thereby simplifying the layout design and reducing the cost.

[0082] Figure 5 is a flowchart of a driving method of a pixel driving circuit provided by an embodiment of the present invention, with reference to Figure 5 , the driving method of the pixel driving circuit includes:

[0083] S510 , in the data writing stage, the data writing module writes the received data voltage signal into the driving module.

[0084] Specifically, Figure 6 is a timing diagram corresponding to a driving method of a pixel driving circuit provided by an embodiment of the present invention, Figure 7 is a timing diagram corresponding to another driving method of a pixel driving circuit provided by an embodiment of the present invention, with reference to Figure 6 or Figure 7In the data writing stage, i.e., stage t1, the third scanning signal Scan3 is at a low level, the data writing module 102 is turned on, and the data writing module 102 writes the data voltage signal Vdata into the first terminal N1 of the driving module 101; at the same time, the scanning signal Scan3' is at a high level, the threshold compensation module 104 is turned on, and the threshold compensation module 104 captures the threshold voltage of the driving module 101 to the control terminal of the driving module 101, and performs threshold compensation on the driving module 101, so that the driving module 101 can better generate a driving current according to the data voltage signal Vdata, and the light-emitting module 105 can accurately display the brightness to be displayed.

[0085] And, reference Figure 7 and Figure 3 In the stage t1 , the first scanning signal Scan1 is at a low level, and the second initialization module 107 can be turned on, and the second initialization module 107 initializes the light emitting module 105 .

[0086] S520 , in the data holding stage, the regulating module regulates and resets the potential of the first end of the driving module.

[0087] Exemplary, reference Figure 2 and Figure 6 In the data holding stage, i.e., stage t2, the first scanning signal Scan1 is at a low level, the first transistor T1 is turned on, and the first transistor T1 writes the second scanning signal Scan2 into the first terminal N1 of the driving module 101. The second scanning signal Scan2 can be at a high level or a low level. Figure 6 Only the case of low level is shown, but it is not limited. The value of the second scan signal Scan2 can be determined according to the specific situation. For example, when the light emitting module 105 is displayed at high brightness for a long time, the voltage of the control terminal of the driving module 101 is low, resulting in a large voltage difference between the control terminal of the driving module 101 and the first terminal N1. The second scan signal Scan2 can be a low level voltage. Writing the low level voltage to the first terminal N1 of the driving module 101 can reduce the voltage difference between the control terminal of the driving module 101 and the first terminal N1, thereby reducing the change of the driving current and improving the flickering problem during high grayscale display; when the light emitting module 105 is displayed at low brightness for a long time, the voltage of the control terminal of the driving module 101 is high, resulting in a large voltage difference between the control terminal and the second terminal of the driving module 101. The second scan signal Scan2 can be a high level, then a high level voltage can be written to the first terminal of the driving module 101, reducing the voltage difference between the control terminal and the second terminal of the driving module 101, reducing the change of the driving current, improving the flickering problem during low grayscale display, and thus improving the flickering problem of the display panel during high, medium and low grayscale display.

[0088] Exemplary, reference Figure 4 and Figure 6In the data holding stage, i.e., stage t2, the first scanning signal Scan1 is at a low level, the second transistor T2 is turned on, and the second transistor T2 writes the first power supply signal VDD into the first terminal N1 of the driving module 101, thereby increasing the potential of the first terminal of the driving module 101; for example, when the light-emitting module 105 is displayed at low brightness for a long time, the voltage of the control terminal of the driving module 101 is relatively high, resulting in a large voltage difference between the control terminal and the second terminal of the driving module 101. The second transistor T2 writes the first power supply signal VDD into the first terminal N1 of the driving module 101, which can increase the potential of the first terminal N1 of the driving module 101, thereby reducing the voltage difference between the control terminal and the second terminal of the driving module 101, reducing the change of the driving current, and improving the flickering problem during low grayscale display. In addition, the potential of the first terminal N1 of the driving module 101 can be kept consistent when different grayscales are displayed, thereby avoiding the problem of inconsistent potentials of the first terminal N1 of the driving module 101 under high, medium and low brightness, resulting in display differences, thereby keeping the full grayscale picture consistent, which is conducive to improving the display effect.

[0089] In addition, reference Figure 6 In the stage t2 , the first scanning signal Scan1 is at a low level, which can control the second initialization module 107 to be turned on, and the second initialization module 107 initializes the light-emitting module 105 .

[0090] Exemplary, reference Figure 3 and Figure 7 In the data holding stage, i.e., stage t2, the first scanning signal Scan1 is at a high level, and the first capacitor C1 can couple the first scanning signal Scan1 to the first terminal N1 of the driving module 101. For example, when the light-emitting module 105 is displayed at low brightness for a long time, the voltage of the control terminal of the driving module 101 is relatively high, resulting in a large voltage difference between the control terminal and the second terminal of the driving module 101. When the first scanning signal Scan1 is at a high level, the first capacitor C1 couples the first scanning signal Scan1 to the first terminal N1 of the driving module 101, which can increase the potential of the first terminal N1 of the driving module 101, thereby reducing the voltage difference between the control terminal and the second terminal of the driving module 101, reducing the change of the driving current, and improving the flicker problem during low grayscale display.

[0091] S530: In the light-emitting stage, the driving module generates a driving current according to the data voltage signal, and the light-emitting module responds to the driving current and emits light.

[0092] Specifically, refer to Figure 6 or Figure 7 In the light-emitting stage, that is, in stage t3, the first enable signal EM1 and the second enable signal EM2 are at a low level, the first light-emitting control module 108 and the second light-emitting control module 109 are at a low level, the driving module 101 can generate a driving current, and the light-emitting module 105 can emit light in response to the driving current.

[0093] Figure 8 is a flowchart of another driving method of a pixel driving circuit provided by an embodiment of the present invention, with reference to Figure 8 , the driving method of the pixel driving circuit includes:

[0094] S610 , in the initialization stage, the regulating module regulates the potential of the first end of the driving module.

[0095] For example, Fig. 9 is a timing diagram corresponding to another driving method of a pixel driving circuit provided by an embodiment of the present invention, Fig.10 is a timing diagram corresponding to another driving method of a pixel driving circuit provided by an embodiment of the present invention, with reference to Fig. 9 and Figure 2 In the initialization stage, i.e., stage t0, the first scanning signal Scan1 is at a low level, the first transistor T1 is turned on, and the first transistor T1 writes the second scanning signal Scan2 into the first terminal N1 of the driving module 101. The second scanning signal Scan2 can be at a high level or a low level. The value of the second scanning signal Scan2 can be determined according to the specific situation. For example, when the light emitting module 105 is displayed at high brightness for a long time, the voltage of the control terminal of the driving module 101 is low, resulting in a large voltage difference between the control terminal of the driving module 101 and the first terminal N1. The second scanning signal Scan2 can be a low level voltage, and the low level voltage is written into the first terminal N1 of the driving module 101. , the voltage difference between the control terminal and the first terminal N1 of the driving module 101 can be reduced, thereby reducing the change of the driving current and further improving the flicker problem during high grayscale display; when the light-emitting module 105 is displayed at low brightness for a long time, the voltage at the control terminal of the driving module 101 is relatively high, resulting in a large voltage difference between the control terminal and the second terminal of the driving module 101. The second scanning signal Scan2 can be a high level, and a high level voltage can be written to the first terminal of the driving module 101 to reduce the voltage difference between the control terminal and the second terminal of the driving module 101, reduce the change of the driving current, and further improve the flicker problem during low grayscale display, thereby further improving the flicker problem of the display panel during high, medium and low grayscale display.

[0096] Exemplary, reference Figure 4 and Fig. 9In the initialization stage, i.e., stage t0, the first scanning signal Scan1 is at a low level, the second transistor T2 is turned on, and the second transistor T2 writes the first power supply signal VDD into the first terminal N1 of the driving module 101, thereby increasing the potential of the first terminal of the driving module 101; for example, when the light-emitting module 105 is displayed at low brightness for a long time, the voltage of the control terminal of the driving module 101 is relatively high, resulting in a large voltage difference between the control terminal and the second terminal of the driving module 101. The second transistor T2 writes the first power supply signal VDD into the first terminal N1 of the driving module 101, which can increase the potential of the first terminal N1 of the driving module 101, thereby reducing the voltage difference between the control terminal and the second terminal of the driving module 101, reducing the change of the driving current, and improving the flickering problem during low grayscale display. In addition, the potential of the first terminal N1 of the driving module 101 can be kept consistent when different grayscales are displayed, thereby further avoiding the problem of inconsistent potentials of the first terminal N1 of the driving module 101 under high, medium and low brightness, resulting in display differences, thereby keeping the full grayscale picture consistent, which is conducive to improving the display effect.

[0097] Exemplary, reference Figure 3 and Fig.10 In the initialization stage, i.e., stage t0, the first scanning signal Scan1 is at a high level, and the first capacitor C1 can couple the first scanning signal Scan1 to the first terminal N1 of the driving module 101. For example, when the light-emitting module 105 is displayed at low brightness for a long time, the voltage of the control terminal of the driving module 101 is relatively high, resulting in a large voltage difference between the control terminal and the second terminal of the driving module 101. When the first scanning signal Scan1 is at a high level, the first capacitor C1 couples the first scanning signal Scan1 to the first terminal N1 of the driving module 101, which can increase the potential of the first terminal N1 of the driving module 101, thereby reducing the voltage difference between the control terminal and the second terminal of the driving module 101, reducing the change of the driving current, and further improving the flicker problem during low grayscale display.

[0098] Furthermore, in the initialization stage t0 , the fourth scanning signal Scan4 is at a high level, so that the first initialization module 106 is turned on, and the first initialization module 106 initializes the control end of the driving module 101 .

[0099] S620 , in the data writing phase, the data writing module writes the received data voltage signal into the driving module.

[0100] S630: In the data holding stage, the regulating module regulates and resets the potential of the first end of the driving module.

[0101] S640: In the light-emitting stage, the driving module generates a driving current according to the data voltage signal, and the light-emitting module responds to the driving current and emits light.

[0102] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0103] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pixel driving circuit, characterized in that: include: Driving module, data writing module, regulating module and lighting module; The data writing module is used to write the received data voltage signal into the first end of the driving module; The regulating module is electrically connected to the first end of the driving module, and the regulating module is used to regulate and reset the potential of the first end of the driving module in the data holding stage; The second end of the driving module is connected to the light emitting module, the driving module is used to generate a driving current according to the data voltage signal, and the light emitting module is used to respond to the driving current and emit light; The regulating module includes a second regulating unit; The first end of the second regulating unit is connected to the first scanning signal, the second end of the second regulating unit is electrically connected to the first end of the driving module, and the second regulating unit is used to increase the potential of the first end of the driving module; The second adjustment unit includes a first capacitor; The first end of the first capacitor is the first end of the second adjusting unit, and the second end of the first capacitor is the second end of the second adjusting unit.

2. The pixel driving circuit according to claim 1, characterized in that: The adjustment module includes a first adjustment unit; The control end of the first regulating unit is connected to the first scanning signal, the first end of the first regulating unit is connected to the second scanning signal, the second end of the first regulating unit is electrically connected to the first end of the driving module, and the first regulating unit is used to write the second scanning signal into the first end of the driving module according to the first scanning signal.

3. The pixel driving circuit according to claim 2, characterized in that: The first regulating unit includes a first transistor, a first end of the first transistor is the first end of the first regulating unit, a second end of the first transistor is the second end of the first regulating unit, and a control end of the first transistor is the control end of the first regulating unit.

4. The pixel driving circuit according to claim 1, characterized in that: The regulating module includes a third regulating unit; The control end of the third regulating unit is connected to the first scanning signal, the first end of the third regulating unit is connected to the first power signal, the second end of the third regulating unit is electrically connected to the first end of the driving module, and the third regulating unit is used to increase the potential of the first end of the driving module.

5. The pixel driving circuit according to claim 4, characterized in that: The third regulating unit includes a second transistor; The first end of the second transistor is the first end of the third regulating unit, the second end of the second transistor is the second end of the third regulating unit, and the control end of the second transistor is the control end of the third regulating unit.

6. The pixel driving circuit according to claim 1, characterized in that: Also includes: A threshold compensation module, a first initialization module, a second initialization module, a first light emitting control module, a second light emitting control module and a storage module; The control end of the data writing module is connected to the third scanning signal, the first end of the data writing module is connected to the data voltage signal, and the second end of the data writing module is electrically connected to the first end of the driving module; The control end of the threshold compensation module is connected to a scanning signal with a polarity opposite to that of the third scanning signal, the first end of the threshold compensation module is electrically connected to the second end of the driving module, and the second end of the threshold compensation module is electrically connected to the control end of the driving module, so as to capture the threshold voltage of the driving module to the control end of the driving module; The control end of the first initialization module receives the fourth scanning signal, the first end of the first initialization module receives the first initialization signal, the second end of the first initialization module is electrically connected to the control end of the driving module, and the first initialization module is used to initialize the control end of the driving module; The control end of the second initialization module is connected to the first scanning signal, the first end of the second initialization module is connected to the second initialization signal, the second end of the second initialization module is electrically connected to the first end of the light emitting module, and the second initialization module is used to initialize the light emitting module; The control end of the first light-emitting control module is connected to the first enable signal, the first end of the first light-emitting control module is connected to the first power signal, and the second end of the first light-emitting control module is electrically connected to the first end of the driving module; The control end of the second light emitting control module is connected to the second enable signal, the first end of the second light emitting control module is electrically connected to the second end of the driving module, and the second end of the second light emitting control module is electrically connected to the first end of the light emitting module; The second end of the light emitting module is connected to a second power signal; The first end of the storage module is electrically connected to the control end of the driving module, the second end of the storage module is connected to the first power signal, and the storage module is used to maintain the potential of the control end of the driving module.

7. A driving method of a pixel driving circuit, applied to the pixel driving circuit according to any one of claims 1 to 6, characterized in that: include: In the data writing stage, the data writing module writes the received data voltage signal into the driving module; In the data holding stage, the regulating module regulates and resets the potential of the first end of the driving module; In the light-emitting stage, the driving module generates a driving current according to the data voltage signal, and the light-emitting module responds to the driving current and emits light.

8. The driving method according to claim 7, characterized in that: Before the data writing phase, it also includes: In the initialization stage, the regulating module regulates the potential of the first end of the driving module.

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