Pixel circuit, driving method thereof and display panel

Abstract

The invention discloses a pixel circuit, a driving method thereof and a display panel. The pixel circuit comprises a driving module, a light-emitting control module, a first initialization module and a light-emitting module, the driving module and the light-emitting control module are connected between the first power supply and the light-emitting module, the driving module is used for generating driving current, and the light-emitting control module is used for controlling whether the driving current is transmitted to the light-emitting module; the control end of the lighting control module is connected with a lighting control line; the first initialization module and the first end of the light emitting module are connected to a first node, a first scanning signal is accessed to the control end of the first initialization module, and the first initialization module is used for responding to the first scanning signal to initialize the first node; wherein the first scanning signal is the same as a light-emitting control signal on the light-emitting control line, or the first scanning signal comprises a first sub-signal and a second sub-signal, and the frequency of the first sub-signal is the same as that of the light-emitting control signal. According to the technical scheme, the display performance of the display panel is improved.

Description

Technical Field

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

[0002] With the rapid development of display technology, the application of display products using organic light emitting devices (OLED) is becoming more and more widespread.

[0003] However, the display performance of current OLED display panels needs to be improved. Summary of the invention

[0004] The present invention provides a pixel circuit and a driving method thereof, and a display panel, so as to improve the display performance of the display panel.

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

[0006] The driving module and the light-emitting control module are connected in series between the first power supply and the light-emitting module, the driving module is used to generate a driving current, the light-emitting control module is used to control whether the driving current is transmitted to the light-emitting module, and the light-emitting module is used to emit light in response to the driving current;

[0007] The control end of the light emitting control module is connected to the light emitting control line;

[0008] The first initialization module and the first end of the light-emitting module are connected to the first node, the control end of the first initialization module is connected to the first scanning signal, and the first initialization module is used to initialize the first node in response to the first scanning signal; wherein, a display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; in the screen display, the first scanning signal is the same as the light-emitting control signal on the light-emitting control line, or the first scanning signal includes a first sub-signal and a second sub-signal, and the frequency of the first sub-signal is the same as the frequency of the light-emitting control signal.

[0009] Optionally, the first initialization module is used to initialize the first node in response to the first sub-signal and / or the second sub-signal; wherein the frequency of the first sub-signal is greater than the frequency of the second sub-signal;

[0010] Preferably, the pixel circuit further includes a second initialization module;

[0011] The second initialization module and the first end of the driving module are connected to the second node, the second initialization module receives the second scanning signal, and the second initialization module is used to initialize the second node and the control end of the driving module in response to the second scanning signal;

[0012] The second scanning signal has the same waveform as the first sub-signal, and the first sub-signal is delayed relative to the second scanning signal.

[0013] Optionally, the pixel circuit further includes a threshold compensation module;

[0014] The threshold compensation module is connected between the second node and the control end of the driving module, and the control end of the threshold compensation module is connected to the third scanning signal; the threshold compensation module is used to perform threshold compensation on the driving module in response to the third scanning signal;

[0015] Preferably, the second sub-signal is the same as the third scanning signal;

[0016] Preferably, in the threshold compensation stage of the data writing frame, the threshold compensation module is turned on in response to the third scanning signal;

[0017] In the first initialization phase of the data writing frame, the second initialization module is turned on in response to the second scanning signal; in the threshold compensation phase of the data writing frame, the first initialization module is turned on in response to the first sub-signal;

[0018] In the second initialization phase of the data holding frame, the first initialization module is turned on in response to the first sub-signal; in the data holding frame, before the second initialization phase, the second initialization module is turned on in response to the second scanning signal;

[0019] Preferably, the first sub-signal is delayed by one line time relative to the second scanning signal;

[0020] Preferably, the first initialization module includes a first initialization transistor and a second initialization transistor;

[0021] A first electrode of the first initialization transistor is connected to a first initialization voltage, a second electrode of the first initialization transistor is connected to a first end of the light emitting module, and a control electrode of the first initialization transistor is connected to a first sub-signal;

[0022] A first electrode of the second initialization transistor is connected to the first initialization voltage, a second electrode of the second initialization transistor is connected to the first node, and a control electrode of the second initialization transistor is connected to the second sub-signal;

[0023] Preferably, in the first initialization phase of the data writing frame, the second initialization transistor is used to respond to the second sub-signal to initialize the first node;

[0024] Preferably, in the second initialization phase of the data holding frame, the first initialization transistor is used to initialize the first node in response to the first sub-signal;

[0025] Preferably, the first initialization transistor and the second initialization transistor are of different types;

[0026] Preferably, the first initialization transistor is a P-type transistor, and the second initialization transistor is an N-type transistor;

[0027] Preferably, the second initialization module includes a third initialization transistor, a first electrode of the third initialization transistor and a first end of the driving module are connected to the second node, a second electrode of the third initialization transistor is used to access the second initialization voltage, and a control electrode of the third initialization transistor is used to access the second scanning signal;

[0028] Preferably, the third initialization transistor is a P-type transistor.

[0029] Optionally, the first scanning signal and the light emitting control signal are the same signal;

[0030] The type of transistor in the light emitting control module is different from the type of transistor in the first initialization module;

[0031] Preferably, in the data writing frame and the data holding frame, the light emitting control signal includes a second effective level;

[0032] Preferably, the first initialization module includes a fourth initialization transistor;

[0033] A first electrode of the fourth initialization transistor is connected to the first initialization voltage, a second electrode of the fourth initialization transistor is connected to the first end of the light emitting module, and a control electrode of the fourth initialization transistor is connected to the light emitting control signal;

[0034] Preferably, the fourth initialization transistor is an N-type transistor.

[0035] Optionally, the driving module includes a driving transistor;

[0036] The light emitting control module includes a first light emitting control transistor and a second light emitting control transistor;

[0037] The first light-emitting control transistor is connected between the first power supply and the second electrode of the driving transistor, and the second light-emitting control transistor is connected between the first electrode of the driving transistor and the first end of the light-emitting module; the control electrode of the first light-emitting control transistor and the control electrode of the second light-emitting control transistor are connected to the light-emitting control line;

[0038] The active portion of the first light emission control transistor is connected to the active portion of the drive transistor, and the active portion of the second light emission control transistor is connected to the active portion of the drive transistor;

[0039] A first electrode of the first light emitting control transistor is connected to a second electrode of the driving transistor;

[0040] Optionally, the second electrode of the driving transistor is connected to the first electrode of the first light emitting control transistor through an active layer;

[0041] A first electrode of the second light emitting control transistor is connected to a first electrode of the driving transistor;

[0042] Optionally, the first electrode of the driving transistor is connected to the second electrode of the second light emitting control transistor through an active layer;

[0043] Preferably, the light emitting control line overlaps with the active portion of the first light emitting control transistor to form a gate of the first light emitting control transistor; the light emitting control line overlaps with the active portion of the second light emitting control transistor to form a gate of the second light emitting control transistor;

[0044] Preferably, the driving transistor is an N-type transistor;

[0045] Preferably, the first light emission control transistor and the second light emission control transistor are of the same type.

[0046] Optionally, the pixel circuit further includes a data writing module;

[0047] The data writing module is connected between the data line and the second end of the driving module, and the control end of the data writing module is connected to the fourth scanning signal; the data writing module is used to transmit the data voltage on the data line to the second end of the driving module in response to the fourth scanning signal;

[0048] Preferably, the first sub-signal and the fourth scanning signal are the same signal;

[0049] Preferably, the data writing module comprises a data writing transistor, the control electrode of the data writing transistor is connected to the fourth scanning signal, the first electrode of the data writing transistor is connected to the data line, and the second electrode of the data writing transistor and the second end of the driving module are connected to the third node;

[0050] Preferably, the data writing transistor is a P-type transistor.

[0051] Optionally, the first initialization module is connected to a first initialization voltage;

[0052] The pixel circuit further includes a second initialization module, a first end of the second initialization module is connected to the first end of the driving module, and a second end of the second initialization module is connected to a second initialization voltage;

[0053] The second initialization voltage is greater than the sum of the maximum value of the data voltage and the threshold voltage of the driving module;

[0054] The second end of the light emitting module is connected to the second power supply, and the difference between the first initialization voltage and the voltage of the second power supply is smaller than the turn-on voltage of the light emitting module;

[0055] Preferably, the second power supply voltage corresponding to the second power supply is zero, the first initialization voltage is greater than zero, and the difference between the first initialization voltage and the voltage of the second power supply is less than the turn-on voltage of the light emitting module;

[0056] Preferably, the pixel circuit further includes a threshold compensation module and a storage module;

[0057] The threshold compensation module is connected between the first end of the driving module and the control end of the driving module, and the control end of the threshold compensation module is connected to the third scanning signal;

[0058] The storage module is connected between the control end of the driving module and the first end of the light emitting module;

[0059] Preferably, the threshold compensation module includes a threshold compensation transistor, the threshold compensation transistor is connected between the first end of the driving module and the control end of the driving module, and the control electrode of the threshold compensation transistor is connected to the third scanning signal;

[0060] Preferably, the storage module includes a storage capacitor connected between the control terminal of the driving module and the first node;

[0061] Preferably, the threshold compensation transistor is an N-type transistor;

[0062] Preferably, the threshold compensation transistor is an N-type transistor;

[0063] Preferably, the first initialization module includes a first initialization transistor and a second initialization transistor; the control electrode of the second initialization transistor is connected to the second sub-signal; the second initialization module includes a third initialization transistor, and the control electrode of the third initialization transistor is used to connect to the second scanning signal; the driving module includes a driving transistor; the pixel circuit also includes a data writing module; the data writing module includes a data writing transistor, and the control electrode of the data writing transistor is connected to the fourth scanning signal; the light emitting control module includes a first light emitting control transistor and a second light emitting control transistor;

[0064] In the data writing frame, the working process of the pixel circuit includes:

[0065] In the first initialization stage, the second initialization transistor is turned on under the control of the second sub-signal, and the first initialization voltage is transmitted to the first node; the threshold compensation transistor is turned on under the control of the third scanning signal, and the third initialization transistor is turned on the control line of the second scanning signal, and the second initialization voltage is transmitted to the control electrode of the driving transistor through the threshold compensation transistor;

[0066] In the data writing and threshold compensation stage, the second initialization transistor is turned on under the control of the second sub-signal, and the first initialization voltage is transmitted to the first node; the data writing transistor is turned on under the control of the fourth scanning signal, and the data voltage on the data line is transmitted to the second electrode of the driving transistor; the threshold compensation transistor is turned on under the control of the third scanning signal, and the storage capacitor is discharged through the threshold compensation transistor, the driving transistor and the data writing transistor, and the threshold compensation is performed on the driving transistor;

[0067] In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current;

[0068] In the data holding frame, the working process of the pixel circuit includes:

[0069] In the second initialization stage, the first initialization transistor is turned on under the control of the first sub-signal to transmit the first initialization voltage to the first node;

[0070] In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current;

[0071] Alternatively, the first initialization module includes a fourth initialization transistor; the control electrode of the fourth initialization transistor is connected to the light emitting control signal;

[0072] In the data writing frame, the working process of the pixel circuit includes:

[0073] In the first initialization stage, the fourth initialization transistor is turned on under the control of the light emitting control signal, and the first initialization voltage is transmitted to the first node; the threshold compensation transistor is turned on under the control of the third scanning signal, and the third initialization transistor is turned on the control line of the second scanning signal, and the second initialization voltage is transmitted to the control electrode of the driving transistor through the threshold compensation transistor;

[0074] In the data writing and threshold compensation stage, the fourth initialization transistor is turned on under the control of the light emitting control signal, and the first initialization voltage is transmitted to the first node; the data writing transistor is turned on under the control of the fourth scanning signal, and the data voltage on the data line is transmitted to the second electrode of the driving transistor; the threshold compensation transistor is turned on under the control of the third scanning signal, and the storage capacitor is discharged through the threshold compensation transistor, the driving transistor and the data writing transistor, and the threshold compensation is performed on the driving transistor;

[0075] In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current;

[0076] In the data holding frame, the working process of the pixel circuit includes:

[0077] In the second initialization stage, the fourth initialization transistor is turned on under the control of the light emitting control signal to transmit the first initialization voltage to the first node;

[0078] In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current.

[0079] According to another aspect of the present invention, a driving method of a pixel circuit is provided, wherein the pixel circuit comprises: a driving module, a light emitting control module, a first initialization module and a light emitting module; the driving module and the light emitting control module are connected between a first power source and the light emitting module; a control end of the light emitting control module is connected to a light emitting control line; the first initialization module and a first end of the light emitting module are connected to a first node, and the first initialization module is connected to a first scanning signal; in a display screen, the driving method comprises:

[0080] In the initialization stage, the first initialization module responds to the first scanning signal to initialize the first node; wherein a display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; the first scanning signal is the same as the light emitting control signal on the light emitting control line, or the first scanning signal includes a first sub-signal and a second sub-signal, and the frequency of the first sub-signal is the same as the frequency of the light emitting control signal;

[0081] In the light-emitting stage, the light-emitting control module controls the driving current generated by the driving module to be transmitted to the light-emitting module, so that the light-emitting module emits light in response to the driving current.

[0082] Optionally, a display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; the initialization phase includes a first initialization phase located in the data writing frame and a second initialization phase located in the data holding frame;

[0083] In the first initialization stage, the first initialization module initializes the first node in response to the first scanning signal;

[0084] In the second initialization stage, the first initialization module initializes the first node in response to the first scanning signal;

[0085] Preferably, the first initialization module includes a first initialization transistor and a second initialization transistor; the first electrode of the first initialization transistor is connected to the first initialization voltage, the second electrode of the first initialization transistor is connected to the first end of the light-emitting module, and the control electrode of the first initialization transistor is connected to the first sub-signal; the first electrode of the second initialization transistor is connected to the first initialization voltage, the second electrode of the second initialization transistor is connected to the first node, and the control electrode of the second initialization transistor is connected to the second sub-signal;

[0086] In the first initialization stage, the first initialization module responds to the first scanning signal to initialize the first end of the first node light emitting module, including:

[0087] In the first initialization stage, the second initialization transistor initializes the first node in response to the second sub-signal;

[0088] In the second initialization stage, the first initialization module responds to the first scanning signal to initialize the first node, including:

[0089] In the second initialization stage, the first initialization transistor initializes the first node in response to the first sub-signal;

[0090] Preferably, in the data writing frame, the driving method further comprises:

[0091] In the threshold compensation phase of the data writing frame, the first initialization module initializes the first node in response to the first scanning signal.

[0092] According to another aspect of the present invention, a display panel is provided. The display panel includes the pixel circuit described in any embodiment of the present invention.

[0093] According to the technical solution of the embodiment of the present invention, the first initialization module can initialize the first end (first node) of the light emitting module in response to the first scanning signal. By setting the first scanning signal connected to the first initialization module to be the same as the light emitting control signal on the light emitting control line, or the frequency of the first sub-signal in the first scanning signal to be the same as the frequency of the light emitting control signal, the first initialization module can initialize the first end (first node) of the light emitting module in both the data writing frame and the data holding frame. Thus, the first end of the light emitting module can be initialized at a high frequency, and the initialization can be performed before each light emission of the light emitting module, so as to clear the residual charge left by the last light emission, thereby improving the accuracy of the light emitting brightness of the light emitting module and avoiding brightness fluctuations. Thus, the problem of the light emitting brightness fluctuation of the light emitting module caused by the failure to initialize before the light emitting module emits light and causing flickering can be avoided, thereby improving the display performance of the display panel formed by the pixel circuit. Moreover, when the first scanning signal and the light emitting control signal are the same signal, the number of gate drive circuits that generate scanning signals can be reduced, thereby reducing the frame size of the display panel. When the first scanning signal includes the first sub-signal and the second sub-signal, the first sub-signal and the second sub-signal cooperate to initialize the first end of the light-emitting module in more time periods, thereby better initializing the first end of the light-emitting module and further improving the display performance of the display panel.

[0094] 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

[0095] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0096] Figure 1 is a structural schematic diagram of a pixel circuit provided by an embodiment of the present invention;

[0097] Figure 2 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0098] Figure 3 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0099] Figure 4 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0100] Figure 5 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0101] Figure 6 It is a schematic diagram of a partial layout structure of a pixel circuit provided by an embodiment of the present invention;

[0102] Figure 7 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0103] Figure 8 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0104] Fig. 9 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0105] Fig.10 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention;

[0106] Fig.11 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0107] Fig.12 is a driving timing diagram of another pixel circuit provided by an embodiment of the present invention;

[0108] Fig.13 is a flow chart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0109] Fig.14is a flow chart of another method for driving a pixel circuit provided by an embodiment of the present invention;

[0110] Fig.15 is a flow chart of another method for driving a pixel circuit provided by an embodiment of the present invention;

[0111] Fig.16 It is a structural schematic diagram of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0112] 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.

[0113] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0114] As mentioned in the background technology, the existing display panel has the problem that the display performance needs to be improved. The inventor has found that the reason for this problem is that the active organic light-emitting diode display panel needs to be driven by current to emit light. The display panel includes a pixel circuit and an organic light-emitting diode. The pixel circuit includes a driving transistor. The driving transistor can generate a driving current according to the data voltage, so that the organic light-emitting diode responds to the driving current to emit light. In order to ensure the accuracy of the organic light-emitting diode each time it emits light, before the data voltage is written to the driving transistor, the organic light-emitting diode needs to be initialized to clear the residual charge of the previous frame. When the refresh frequency of the display panel is low, after the data is written, the organic light-emitting diode needs to keep emitting light for a long time. If the organic light-emitting diode is initialized only before the data is written, the organic light-emitting diode cannot be initialized before the light is emitted in the holding stage, resulting in residual charge on the electrode of the organic light-emitting diode, so that the brightness of the organic light-emitting diode may fluctuate, thereby generating flickering, affecting the display effect of the display panel, and making the display performance of the display panel poor.

[0115] In view of the above technical problem, an embodiment of the present invention provides a pixel circuit. Figure 1 is a schematic diagram of a pixel circuit provided by an embodiment of the present invention, with reference to Figure 1 , the pixel circuit includes: a driving module 110, a light emitting control module 120, a first initialization module 130 and a light emitting module 140;

[0116] The driving module 110 and the light emitting control module 120 are connected in series between the first power source VDD and the light emitting module 140. The driving module 110 is used to generate a driving current. The light emitting control module 120 is used to control whether the driving current is transmitted to the light emitting module 140. The light emitting module 140 is used to emit light in response to the driving current.

[0117] The control end of the light emitting control module 120 is connected to the light emitting control line EM;

[0118] The first ends of the first initialization module 130 and the light-emitting module 140 are connected to the first node S, the control end of the first initialization module 130 is connected to the first scanning signal S1, and the first initialization module 130 is used to initialize the first node S in response to the first scanning signal S1; wherein, a display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; in the screen display, the first scanning signal S1 is the same as the light-emitting control signal on the light-emitting control line EM, or the first scanning signal S1 includes a first sub-signal and a second sub-signal, and the frequency of the first sub-signal is the same as the frequency of the light-emitting control signal EM.

[0119] The light emitting module 140 may include an organic light emitting diode, and the second end of the light emitting module 140 may be connected to a second power source VSS. For example, the first power source voltage provided by the first power source VDD is a positive voltage, and the voltage provided by the second power source VSS is a zero or negative voltage; or, the first power source voltage provided by the first power source VDD is a zero or negative voltage, and the voltage provided by the second power source VSS is a positive voltage, which is not limited in this embodiment.

[0120] The light control signal on the light control line EM can control whether the light control module 120 is turned on. When the light control module 120 is turned on, the first power supply VDD, the light control module 120, the light emitting module 140 and the second power supply VSS form a current path, so that the driving current generated by the driving module 110 can be transmitted to the light emitting module 140, so that the light emitting module 140 can emit light in response to the driving current.

[0121] Specifically, when the first scan signal S1 controls the first initialization module 130 to be turned on, the first initialization module 130 can initialize the first end (first node S) of the light emitting module 140, clear the residual charge of the first end of the light emitting module 140, so that the light emitting module 140 can better respond to the driving current generated by the driving module 110 to emit light. By setting a display screen of the display panel corresponding to the pixel circuit to include a data writing frame and a data holding frame; the first scan signal S1 connected to the first initialization module 130 is the same as the light emitting control signal on the light emitting control line EM, that is, the first scan signal S1 and the light emitting control signal are the same signal, then the frequency of the first scan signal S1 is the same as the light emitting control signal, so that the frequency of the first scan signal S1 is higher, so that the first end of the light emitting module 140 can be initialized at a high frequency, so that the light emitting brightness of the light emitting module 140 can be prevented from fluctuating due to the failure to initialize before the light emitting module 140 emits light, and the flickering problem can be avoided, so that the display performance of the display panel can be improved. Similarly, by setting the frequency of the first sub-signal to be the same as the frequency of the light-emitting control signal EM, the frequency of the first sub-signal is higher, and high-frequency initialization can be achieved for the first end of the light-emitting module 140, thereby avoiding the problem of the light-emitting brightness of the light-emitting module 140 fluctuating and flickering due to the failure to initialize the light-emitting module 140 before emitting light, thereby improving the display performance of the display panel formed by the pixel circuit.

[0122] In this way, when the refresh frequency of the display panel formed by the pixel circuit is low, the light-emitting module 140 can be initialized at a high frequency. The light-emitting module 140 can be initialized before each light emission to clear the residual charge left by the previous light emission, thereby improving the accuracy of the light-emitting brightness of the light-emitting module 140 and avoiding brightness fluctuations.

[0123] Moreover, when the first scanning signal S1 and the light-emitting control signal are the same signal, the number of signals can be reduced, thereby reducing the number of signal lines, and the number of gate driving circuits that generate scanning signals can be reduced, thereby reducing the border size of the display panel formed by the pixel circuit and achieving a narrow border.

[0124] When the first scanning signal S1 includes the first sub-signal and the second sub-signal, the first sub-signal and the second sub-signal cooperate to initialize the first end of the light emitting module 140 in more time periods, thereby better initializing the first end of the light emitting module 140. Moreover, the first sub-signal and / or the second sub-signal may also be generated by an existing gate driving circuit in the display panel, thereby reducing the number of gate driving circuits.

[0125] In the technical solution of this embodiment, the first initialization module can initialize the first end (first node) of the light emitting module in response to the first scanning signal. By setting the first scanning signal connected to the first initialization module to be the same as the light emitting control signal on the light emitting control line, or the frequency of the first sub-signal in the first scanning signal to be the same as the frequency of the light emitting control signal, the first initialization module can initialize the first end (first node) of the light emitting module in both the data writing frame and the data holding frame. Thus, the first end of the light emitting module can be initialized at a high frequency, and the initialization can be performed before each light emission of the light emitting module, so as to clear the residual charge left by the last light emission, thereby improving the accuracy of the light emitting brightness of the light emitting module and avoiding brightness fluctuations. Thus, the problem of the light emitting brightness fluctuation of the light emitting module caused by the failure to initialize before the light emitting module emits light and causing flickering can be avoided, thereby improving the display performance of the display panel formed by the pixel circuit. In addition, when the first scanning signal and the light emitting control signal are the same signal, the number of gate drive circuits that generate scanning signals can be reduced, thereby reducing the frame size of the display panel. When the first scanning signal includes the first sub-signal and the second sub-signal, the first sub-signal and the second sub-signal cooperate to initialize the first end of the light-emitting module in more time periods, thereby better initializing the first end of the light-emitting module and further improving the display performance of the display panel.

[0126] On the basis of the above technical solution, the pixel circuit is further described below in combination with the first scanning signal S1 being a light-emitting control signal, and the first scanning signal S1 including two situations of a first sub-signal and a second sub-signal, but this is not intended to limit the present application.

[0127] In one embodiment, Figure 2 is a schematic diagram of a structure of another pixel circuit provided by an embodiment of the present invention. Figure 2The first scanning signal S1 includes a first sub-signal S11 and a second sub-signal S12, and the first initialization module 130 is used to initialize the first node S in response to the first sub-signal S11 and / or the second sub-signal S12; wherein the frequency of the first sub-signal S11 is greater than the frequency of the second sub-signal S12.

[0128] Specifically, when the first sub-signal S11 is at an effective level, the first initialization module 130 is turned on, so that the first initialization module 130 can initialize the first end (first node S) of the light-emitting module 140. When the second sub-signal S12 is at an effective level, the first initialization module 130 is turned on, so that the first initialization module 130 can initialize the first end (first node S) of the light-emitting module 140. When both the first sub-signal S11 and the second sub-signal S12 are at effective levels, the first initialization module 130 can also be turned on to initialize the first end of the light-emitting module 140. The voltage values ​​corresponding to the effective level of the first sub-signal S11 and the effective level of the second sub-signal S12 can be the same or different, which is not limited in this embodiment.

[0129] By setting the frequency of the first sub-signal S11 to be greater than the frequency of the second sub-signal S12, the frequency of the first sub-signal S11 is higher, thereby realizing the high-frequency initialization of the light-emitting module 140. And the frequency of the second sub-signal S12 does not need to be higher, so the second sub-signal S12 can use the existing signal in the pixel circuit, which can reduce the number of signals, thereby reducing the number of signal lines and gate drive circuits in the display panel formed by the pixel circuit.

[0130] Optionally, refer to Figure 2 , the pixel circuit further includes a second initialization module 150;

[0131] The second initialization module 150 and the first end of the driving module 110 are connected to the second node N, the second initialization module 150 receives the second scanning signal S2, and the second initialization module 150 is used to initialize the second node N and the control end G of the driving module 110 in response to the second scanning signal S2;

[0132] The second scanning signal S2 has the same waveform as the first sub-signal S11 , and the first sub-signal S11 is delayed relative to the second scanning signal S2 .

[0133] Specifically, by setting the second initialization module 150 , when the second scan signal S2 controls the second initialization module 150 to be turned on, the second initialization module 150 can initialize the first end (the second node N) of the driving module 110 and the control end of the driving module 110 .

[0134] The display panel formed by the pixel circuit includes a shift register, and the shift register includes a plurality of gate drive circuits connected in cascade, for example, one level of gate drive circuit corresponds to one row of pixel circuits. The gate drive circuit can output a gate drive signal, for example, output a second scan signal S2. By setting the second scan signal S2 to have the same waveform as the first sub-signal S11, the first sub-signal S11 is delayed relative to the second scan signal S2, so that the second scan signal S2 and the first sub-signal S11 can be output by different levels of gate drive circuits in the same shift register, for example, the signal output by the m+1th level gate drive circuit is the second scan signal S2 corresponding to the m+1th row of pixel circuits, that is, the first sub-signal S11 corresponding to the mth row of pixel circuits, thereby realizing the sharing of the gate drive circuit, thereby reducing the number of gate drive circuits, which is beneficial to reducing the frame size of the display panel. Wherein, m is an integer greater than 1. When the gate drive circuit is shared, one more level of gate drive circuit is set in the shift register, for example, the added gate drive circuit only outputs the second scan signal for the first row of pixel circuits.

[0135] On the basis of the above technical solution, optionally, refer to Figure 2 , the pixel circuit further includes a threshold compensation module 160;

[0136] The threshold compensation module 160 is connected between the second node N and the control end of the driving module 110 . The control end of the threshold compensation module 160 is connected to the third scanning signal S3 . The threshold compensation module 160 is used to perform threshold compensation on the driving module 110 in response to the third scanning signal S3 .

[0137] Specifically, when the third scanning signal S3 controls the threshold compensation module 160 to be turned on, the threshold compensation module 160 can perform threshold compensation on the driving module 110, so that the driving current generated by the driving module 110 is independent of the threshold voltage of the driving module 110, thereby avoiding the fluctuation of the driving current caused by the threshold voltage offset of the driving module 110, so that the light-emitting module 140 can emit light stably. In addition, when the threshold compensation module 160 and the second initialization module 150 are turned on at the same time, the second initialization module 150 can initialize the control terminal of the driving module 110 through the threshold compensation module 160, so that the driving module 110 can better generate the driving current.

[0138] Optionally, the second sub-signal S12 is the same as the third scanning signal S3, that is, the second sub-signal S12 is the same as the third scanning signal S3, thereby reducing the number of signal lines in the display panel formed by the pixel circuit, reducing the number of gate driving circuits in the display panel, and further reducing the frame size of the display panel.

[0139] Optionally, in the threshold compensation stage of the data writing frame, the threshold compensation module 160 is turned on in response to the third scanning signal S3;

[0140] In the first initialization phase of the data writing frame, the second initialization module 150 is turned on in response to the second scanning signal S2; in the threshold compensation phase of the data writing frame, the first initialization module 130 is turned on in response to the first sub-signal S11;

[0141] In the second initialization phase of the data holding frame, the first initialization module 130 is turned on in response to the first sub-signal S11 ; in the data holding frame, before the second initialization phase, the second initialization module 150 is turned on in response to the second scanning signal S2 .

[0142] Specifically, by setting the threshold compensation stage of the data writing frame, the threshold compensation module 160 is turned on in response to the third scanning signal S3, so that the threshold compensation module 160 performs threshold compensation on the driving module 110. In the threshold compensation stage of the data writing frame, the first initialization module 130 is turned on in response to the first sub-signal S11; in the second initialization stage of the data holding frame, the first initialization module 130 is turned on in response to the first sub-signal S11; then in both the data writing frame and the data holding frame, the first initialization module 130 can initialize the first end of the light emitting module 140, thereby realizing high-frequency initialization of the light emitting module 140 and improving the initialization effect of the light emitting module 140.

[0143] Optionally, the first sub-signal S11 is delayed by one line time relative to the second scanning signal S2. In this way, the signal output by the m+1-th level gate driving circuit is the second scanning signal S2 corresponding to the m+1-th row pixel circuit, that is, the first sub-signal S11 corresponding to the m-th row pixel circuit, thereby realizing the sharing of the gate driving circuit, thereby reducing the number of gate driving circuits, which is beneficial to reducing the frame size of the display panel. Among them, one line time can be calculated according to the resolution and refresh rate of the display panel, and the number of rows of pixel circuits (that is, the number of rows of light-emitting elements) can be determined according to the resolution, so that a line time is

[0144] Optionally, refer to Figure 2 , the first initialization module 130 includes a first initialization transistor T1 and a second initialization transistor T2;

[0145] A first electrode of the first initialization transistor T1 is connected to a first initialization voltage Vref1, a second electrode of the first initialization transistor T1 is connected to a first end of the light emitting module 140, and a control electrode of the first initialization transistor T1 is connected to a first sub-signal S11;

[0146] A first electrode of the second initialization transistor T2 is connected to the first initialization voltage Vref2 , a second electrode of the second initialization transistor T2 is connected to the first node S, and a control electrode of the second initialization transistor T2 is connected to the second sub-signal S12 .

[0147] Specifically, when the first sub-signal S11 is at an effective level, the first initialization transistor T1 is turned on, and the first initialization voltage Vref1 is transmitted to the first end of the light emitting module 140 to initialize the first end of the light emitting module 140. When the second sub-signal S12 is at an effective level, the second initialization transistor T2 is turned on, and the second initialization transistor T2 transmits the first initialization voltage Vref1 to the first end of the light emitting module 140 to initialize the first end of the light emitting module 140. In this way, the first initialization module 130 can initialize the first end of the light emitting module 140 in response to the first sub-signal S11 and / or the second sub-signal S12.

[0148] The first initialization transistor T1 and the second initialization transistor T2 may be of the same type or different types. Figure 2 The case where the first initialization transistor T1 and the second initialization transistor T2 are of different types is shown in the figure, but this is not limited. It can be seen that when the first initialization transistor T1 and the second initialization transistor T2 are of the same type, the voltage value corresponding to the effective level of the first sub-signal S11 and the effective level of the second sub-signal S12 can be the same. When the first initialization transistor T1 and the second initialization transistor T2 are of different types, the voltage value corresponding to the effective level of the first sub-signal S11 and the effective level of the second sub-signal S12 are different, which is not limited in this embodiment.

[0149] Optionally, in the first initialization phase of the data writing frame, the second initialization transistor T2 is used to respond to the second sub-signal S12 to initialize the first node S. In this way, the first node S is initialized in the first initialization phase of the data writing frame.

[0150] Optionally, in the second initialization phase of the data holding frame, the first initialization transistor T1 is used to respond to the first sub-signal S11 to initialize the first node S. In this way, the first node S is initialized in the first initialization phase of the data holding frame.

[0151] Optionally, the first initialization transistor T1 and the second initialization transistor T2 are of different types.

[0152] Optionally, the first initialization transistor T1 is a P-type transistor, and the second initialization transistor T2 is an N-type transistor.

[0153] Optionally, refer to Figure 2The second initialization module 150 includes a third initialization transistor T3, a first electrode of the third initialization transistor T3 and a first end of the driving module 110 are connected to the second node N, a second electrode of the third initialization transistor T3 is used to access the second initialization voltage Vref2, and a control electrode of the third initialization transistor T3 is used to access the second scanning signal S2.

[0154] Specifically, when the second scan signal S2 is at an effective level, the third initialization transistor T3 is turned on, and the third initialization transistor T3 can transmit the second initialization voltage Vref2 to the first end of the driving module 110 to initialize the first end of the driving module 110. When the second scan signal S2 and the third scan signal S3 are both at effective levels, the third initialization transistor T3 and the threshold compensation module 160 are both turned on, and the third initialization transistor T3 transmits the second initialization voltage to the control end of the driving module 110 through the threshold compensation module 160 to initialize the control end of the driving module 110. In this way, the second initialization module 150 initializes the first end of the driving module 110 and the control end of the driving module 110.

[0155] Optionally, the third initialization transistor T3 is a P-type transistor.

[0156] In another embodiment, Figure 3 is a schematic diagram of a structure of another pixel circuit provided by an embodiment of the present invention. Figure 3 , the first scanning signal S1 and the light-emitting control signal are the same signal; the type of transistor in the light-emitting control module 120 is different from the type of transistor in the first initialization module 130. In this way, when the light-emitting control signal is at the first level, the first initialization module 130 is turned on, and the first initialization module 130 can initialize the first end of the light-emitting module 140, the light-emitting control module 120 is not turned on, the driving current generated by the driving module 110 will not be transmitted to the light-emitting module 140, and the light-emitting module 140 will not emit light. When the light-emitting control signal is at the second level, the first initialization module 130 is not turned on, the light-emitting control module 129 is turned on, the driving current generated by the driving module 110 is transmitted to the light-emitting module 140, and the light-emitting module 140 emits light. In this way, the initialization and light-emitting stages of the light-emitting module 140 are staggered, and the light-emitting module 140 can be initialized before each light emission, which can improve the initialization effect of the light-emitting module 140 and achieve a higher frequency of initialization. Among them, the first level is a high level, and the second level is a low level; or the first level is a low level, and the second level is a high level, which is not limited here.

[0157] Optionally, a display frame of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; in the data writing frame and the data holding frame, the light emitting control signal includes a second effective level. In this way, it can be ensured that the light emitting module 140 emits light in the data writing frame and keeps emitting light in the data holding frame. And it can be ensured that the first initialization module 130 initializes the first end of the light emitting module 140 in the data writing frame, and initializes the first end of the light emitting module 140 in the data holding frame, so as to achieve initialization at a higher frequency. Among them, the second effective level can be a level for controlling the light emitting control module 120 to be turned on or a level for controlling the first initialization module 130 to be turned on.

[0158] Optionally, refer to Figure 3 , the first initialization module 130 includes a fourth initialization transistor T1 ′;

[0159] The first electrode of the fourth initialization transistor T1' is connected to the first initialization voltage Vref1, the second electrode of the fourth initialization transistor T1' is connected to the first end of the light emitting module 140, and the control electrode of the fourth initialization transistor T1' is connected to the light emitting control signal. That is, the control electrode of the fourth initialization transistor T1' is connected to the light emitting control line EM.

[0160] Specifically, when the light emitting control signal controls the fourth initialization transistor T1' to be turned on, the fourth initialization transistor T1' transmits the first initialization voltage Vref1 to the first end of the light emitting module 140 to initialize the first end of the light emitting module 140. In this way, the period of initialization of the first end of the light emitting module 140 and the period of light emission of the light emitting module 140 can be alternately performed, so that the frequency of initialization of the first end of the light emitting module 140 is high.

[0161] Optionally, the fourth initialization transistor T1 ′ is an N-type transistor.

[0162] Based on the above technical solutions, Figure 4 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention, Figure 5 is a schematic diagram of a structure of another pixel circuit provided by an embodiment of the present invention. Figure 4 or Figure 5 , the driving module 110 includes a driving transistor T4;

[0163] The light emission control module 120 includes a first light emission control transistor T5 and a second light emission control transistor T6;

[0164] The first light-emitting control transistor T5 is connected between the first power supply VDD and the second electrode of the driving transistor T4, and the second light-emitting control transistor T6 is connected between the first electrode of the driving transistor T4 and the first end of the light-emitting module 140; the control electrode of the first light-emitting control transistor T5 and the control electrode of the second light-emitting control transistor T6 are connected to the light-emitting control line EM.

[0165] Specifically, when the light-emitting control signal on the light-emitting control line EM controls the first light-emitting control transistor T5 and the second light-emitting control transistor T6 to turn on, the first power supply VDD, the first light-emitting control transistor T5, the driving transistor T4, the second light-emitting control transistor T6, the light-emitting module 140 and the second power supply VSS form a current path, so that the driving current generated by the driving transistor T4 is transmitted to the light-emitting module 140, so that the light-emitting module 140 emits light.

[0166] When the first initialization module 130 includes the fourth initialization transistor T1', the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are P-type transistors, and the fourth initialization transistor T1' is an N-type transistor; or, the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are N-type transistors, and the fourth initialization transistor T1' is a P-type transistor. Figure 5 2 shows a case where the first light emission control transistor T5 and the second light emission control transistor T6 are P-type transistors and the fourth initialization transistor T1 ′ is an N-type transistor, but this is not limited thereto.

[0167] Figure 6 is a schematic diagram of a local layout structure of a pixel circuit provided by an embodiment of the present invention. Optionally, refer to Figure 6 , the active part T51 of the first light emission control transistor T5 is connected to the active part T41 of the driving transistor T4, and the active part T61 of the second light emission control transistor T6 is connected to the active part T41 of the driving transistor T4; the first electrode of the first light emission control transistor T5 is connected to the second electrode of the driving transistor T4, and the second electrode of the driving transistor T4 is connected to the first electrode of the first light emission control transistor T5 through the active layer; the first electrode of the second light emission control transistor T6 is connected to the first electrode of the driving transistor T4, and the first electrode of the driving transistor T4 is connected to the second electrode of the second light emission control transistor T6 through the active layer. Optionally, the light emission control line EM overlaps with the active part of the first light emission control transistor T5 to form the gate of the first light emission control transistor T5; the light emission control line EM overlaps with the active part of the second light emission control transistor T6 to form the gate of the second light emission control transistor T6.

[0168] The active layer is a film layer where the active portion T51 of the first light emission control transistor T5 , the active portion T41 of the driving transistor T4 , and the active portion T61 of the second light emission control transistor T6 are located.

[0169] By arranging that the second electrode of the driving transistor T4 is connected to the first electrode of the first light emission control transistor T5 through the active layer, and the first electrode of the driving transistor T4 is connected to the second electrode of the second light emission control transistor T6 through the active layer, the arrangement of the connection lines can be reduced.

[0170] Specifically, the control electrode T44 of the driving transistor T4 overlaps with the active portion T41 of the driving transistor T4. The light-emitting control line EM overlaps with the active portion T51 of the first light-emitting control transistor T5 to form the control electrode (i.e., gate) of the first light-emitting control transistor T5, and the light-emitting control line EM overlaps with the active portion T61 of the second light-emitting control transistor T6 to form the control electrode (i.e., gate) of the second light-emitting control transistor T6. One light-emitting control line EM is used to form the gates of two transistors, thereby saving layout space, facilitating layout, and facilitating the realization of a higher pixel density.

[0171] It should be noted that Figure 6 In the figure, only the driving transistor T4, the first light emission control transistor T5 and the second light emission control transistor T6 are illustrated, and the structures of the driving transistor T4, the first light emission control transistor T5 and the second light emission control transistor T6 are not limited.

[0172] Optionally, the driving transistor T4 is an N-type transistor.

[0173] Optionally, the first light emission control transistor T5 and the second light emission control transistor T6 are of the same type. Optionally, the first light emission control transistor T5 and the second light emission control transistor T6 are both P-type transistors.

[0174] Figure 7 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention, Figure 8 is a schematic diagram of a structure of another pixel circuit provided by an embodiment of the present invention. Figure 7 or Figure 8 , the pixel circuit further includes a data writing module 170;

[0175] The data writing module 170 is connected between the data line Data and the second end of the driving module 110, and the control end of the data writing module 170 is connected to the fourth scanning signal S4; the data writing module 170 is used to transmit the data voltage on the data line Data to the second end of the driving module 110 to the third node D in response to the fourth scanning signal S4.

[0176] Specifically, in the data writing phase of the data writing frame, when the fourth scanning signal S4 controls the data writing module 170 to be turned on, the data writing module 170 transmits the data voltage on the data line Data to the second end of the driving module 110. When the data writing module 170 and the threshold compensation module 160 are turned on at the same time, the data voltage can be transmitted to the control end of the driving module 110 through the data writing module 170, the driving module 110 and the threshold compensation module 160, so that the control end of the driving module 110 is the voltage after the threshold compensation, thereby realizing data writing and threshold compensation. The driving module 110 generates a driving current according to the voltage after the threshold compensation, so that the light emitting module 140 can emit light better.

[0177] Optionally, refer to Figure 7 The first sub-signal S11 and the fourth scanning signal S4 are the same signal. In this way, the number of signals can be further reduced, that is, the number of signal lines can be further reduced, and the number of gate driving circuits can be further reduced, thereby reducing the frame size of the display panel.

[0178] Fig. 9 is a structural schematic diagram of another pixel circuit provided by an embodiment of the present invention, Fig.10 is a schematic diagram of a structure of another pixel circuit provided by an embodiment of the present invention. Fig. 9 or Fig.10 The data writing module 170 includes a data writing transistor T7, a control electrode of the data writing transistor T7 is connected to the fourth scanning signal S4, a first electrode of the data writing transistor T7 is connected to the data line Data, and a second electrode of the data writing transistor T7 is connected to the second end of the driving module 110.

[0179] Specifically, in the data writing stage of the data writing frame, the fourth scanning signal S4 controls the data writing transistor T7 to turn on. When the data writing transistor T7 and the threshold compensation module 160 are turned on at the same time, the data voltage can be transmitted to the control end of the driving module 110 through the data writing transistor T7, the driving module 110 and the threshold compensation module 160, so that the control end of the driving module 110 is the voltage after threshold compensation, thereby realizing data writing and threshold compensation.

[0180] When the first initialization module 130 includes the first initialization transistor T1 and the second initialization transistor T2, the data writing transistor T7 is of the same type as the first initialization transistor T1, so that the first sub-signal corresponding to the first initialization transistor T1 and the fourth scanning signal S4 corresponding to the data writing transistor T7 are the same signal. Fig. 9 The case where both the first initialization transistor T1 and the data writing transistor T7 are P-type transistors is shown in the figure, but this is not limited to the above.

[0181] Optionally, the data writing transistor T7 is a P-type transistor.

[0182] Optionally, refer to Figure 7 or Figure 8 , the first initialization module 130 is connected to the first initialization voltage Vref1;

[0183] The pixel circuit further includes a second initialization module 150, a first end of the second initialization module 150 is connected to a first end of the driving module 110, and a second end of the second initialization module 150 is connected to a second initialization voltage Vref2;

[0184] The second initialization voltage Vref2 is greater than the sum of the maximum value of the data voltage and the threshold voltage of the driving module 110;

[0185] The second end of the light emitting module 140 is connected to the second power source VSS, and the difference between the first initialization voltage Vref1 and the second power source VSS is smaller than the turn-on voltage of the light emitting module 140 .

[0186] Specifically, after the control terminal G of the driving module 110 is initialized, the voltage of the control terminal G of the driving module 110 is the second initialization voltage Vref2. After the data writing module 170 is turned on, the data writing module 170 transmits the data voltage to the second terminal D of the driving module 110. By controlling the second initialization voltage Vref2 to be greater than the sum of the maximum value of the data voltage and the threshold voltage of the driving module 110, it can be ensured that after the data voltage is transmitted to the second terminal D of the driving module 110, the voltage of the control terminal G of the driving module 110 is greater than the sum of the voltage of the second terminal D of the driving module 110 and the threshold voltage of the driving module 110, that is, it can be ensured that the voltage difference between the control terminal G of the driving module 110 and the second terminal D of the driving module 110 is greater than the threshold voltage of the driving module 110, thereby ensuring that the driving module 110 can be turned on, so that the data voltage can be transmitted to the control terminal of the driving module 110 through the driving module 110 and the threshold compensation module 160, so that the driving module 110 generates a driving current according to the data voltage.

[0187] After the first end S of the light-emitting module 140 is initialized, the voltage of the first end S of the light-emitting module 140 is the first initialization voltage Vref1. By setting the second end of the light-emitting module 140 to be connected to the second power supply VSS, the difference between the first initialization voltage Vref1 and the voltage of the second power supply VSS is smaller than the turn-on voltage of the light-emitting module 140. This ensures that when the light-emitting module 140 is initialized, the light-emitting module 140 will not be turned on, that is, it ensures that the light-emitting module 140 will not emit light during initialization, thereby avoiding abnormal light emission of the light-emitting module 140.

[0188] Optionally, refer to Figure 7 or Figure 8, the second power supply voltage corresponding to the second power supply VSS is zero, the first initialization voltage Vref1 is greater than zero, and the difference between the first initialization voltage Vref1 and the voltage of the second power supply VSS is less than the turn-on voltage of the light emitting module 140 .

[0189] Specifically, the second power supply voltage corresponding to the second power supply VSS is zero, so that the difference between the data voltage and the second power supply voltage will not be too large, thereby improving the charging and discharging efficiency of the storage module in the pixel circuit, and making the light-emitting module 140 not turn on too late, which is beneficial to improving the light-emitting effect of the light-emitting module 140.

[0190] Optionally, refer to Figure 7 or Figure 8 , the pixel circuit further includes a threshold compensation module 160 and a storage module 180;

[0191] The threshold compensation module 160 is connected between the first terminal N of the driving module 110 and the control terminal G of the driving module 110 , and the control terminal G of the threshold compensation module 160 is connected to the third scanning signal S3 ;

[0192] The storage module 180 is connected between the control terminal G of the driving module 110 and the first terminal S of the light emitting module 140 .

[0193] Specifically, by providing the storage module 180, the voltage of the control terminal G of the driving module 110 can be maintained to ensure that the driving module 110 can stably generate a driving current. In addition, the storage module 180 can couple the voltage of the second power supply VSS to the control terminal G of the driving module 110, so that the driving current generated by the driving module 110 is independent of the second power supply VSS.

[0194] The first end of the storage module 180 is connected to the first end S of the light emitting module 140 , and the second end of the storage module 180 is connected to the control end G of the driving module 110 .

[0195] Exemplarily, in the first initialization stage of the data writing frame, the first initialization module 130 transmits the first initialization voltage Vref1 to the first terminal S of the light emitting module 140, that is, to the first terminal of the storage module 180, and the voltage of the first terminal of the storage module 180 is Vs=Vref1. The second initialization module 150 transmits the second initialization voltage Vref2 to the first terminal N of the driving module 110, and transmits it to the control terminal G of the driving module 110 through the threshold compensation module 160, and the voltage of the first terminal N of the driving module 110 is Vn=Vref2, and the voltage of the control terminal G of the driving module 110 is Vg=Vref2. That is, the voltage of the second terminal of the storage module 180 is Vref2.

[0196] In the data writing and threshold compensation phase of the data writing frame, the data writing module 170 transmits the data voltage Vdata on the data line Data to the second terminal D of the driving module 110, the driving module 110 is turned on, the voltage at the second terminal of the storage module 180 is relatively large, and the storage module 180 is discharged through the threshold compensation module 160, the driving module 110 and the data writing module 170 until the voltage at the control terminal G of the driving module 110 is Vdata+Vth, where Vth is the threshold voltage of the driving module 110, that is, the threshold voltage of the driving transistor T4 in the driving module 110. The voltage at the first terminal of the storage module 180 is still the first initialization voltage Vref1. Then the voltage stored in the storage module 180 is Vdata+Vth-Vref1.

[0197] In the light-emitting phase of the data writing frame, the light-emitting control module 120 is turned on, and the first power supply VDD, the light-emitting control module 120, the driving module 110, the light-emitting module 140 and the second power supply VSS form a current path, and the voltage of the first terminal S of the light-emitting module 140 is Vs=Vss+Voled, that is, the voltage of the first terminal of the storage module 180 is Vss+Voled. Among them, Vss is the second power supply voltage provided by the second power supply VSS, and Voled is the cross voltage of the light-emitting module 140. Since the voltage stored in the storage module 180 remains unchanged, the voltage at the second end of the storage module 180 is Vdata+Vth-Vref1+Vss+Voled, that is, the voltage at the control end G of the driving module 110 is Vg=Vdata+Vth-Vref1+Vss+Voled, and the voltage at the first end N of the driving module 110 is Vn=Vss+Voled. The voltage difference between the control end G of the driving module 110 and the first end N of the driving module 110 is Vdata+Vth-Vref1, and the driving current generated by the driving module 110 is Wherein, μ is the electron mobility of the driving transistor T4 in the driving module 110, Cox is the channel capacitance per unit area of ​​the driving transistor T4, W is the channel width of the driving transistor T4, and L is the channel length of the driving transistor T4. In this way, the driving current generated by the driving module 110 is only related to the data voltage Vdata and the first initialization voltage Vref1, and is independent of the threshold voltage of the driving transistor T4 in the driving module 110, and is independent of the first power supply VDD and the second power supply VSS, so that the fluctuation of the driving current caused by the threshold voltage fluctuation of the driving transistor T4 can be avoided, and the fluctuation of the driving current caused by the voltage drop of the first power supply VDD or the second power supply VSS can be avoided, thereby ensuring the stability and accuracy of the driving current, which is conducive to improving the display effect of the display panel, and further improving the display performance of the display panel. In addition, the driving current is independent of the cross-voltage of the light-emitting module 140, which can avoid the problem of driving current fluctuation caused by the cross-voltage change caused by the aging of the light-emitting module 140, thereby further improving the display effect of the display panel.

[0198] Optionally, refer to Fig. 9 or Fig.10 The threshold compensation module 160 includes a threshold compensation transistor T8, which is connected between the first terminal N of the driving module 110 and the control terminal G of the driving module 110, and the control electrode of the threshold compensation transistor T8 is connected to the third scanning signal S3.

[0199] Specifically, in the first initialization stage of the data writing frame, the threshold compensation transistor T8 is turned on in response to the third scanning signal S3, so that the second initialization module 150 can transmit the second initialization voltage Vref2 to the control end of the driving module 110 through the threshold compensation transistor T8, and initialize the control end of the driving module 110. In the data writing and threshold compensation stage, the threshold compensation transistor T8 is turned on, and the data voltage can be transmitted to the control end of the driving module 110 through the threshold compensation transistor T8.

[0200] Exemplarily, when the first initialization module 130 includes a first initialization transistor T1 and a second initialization transistor T2, the type of the threshold compensation transistor T8 is the same as the type of the second initialization transistor T2, so that the third scan signal S3 and the second sub-signal S12 are the same signal, thereby reducing the data of the signal line and the number of gate drive circuits. Fig. 9 FIG. 4 shows a case where the threshold compensation transistor T8 and the second initialization transistor T2 are N-type transistors, but this is not limited thereto.

[0201] Optionally, the threshold compensation transistor T8 is an N-type transistor.

[0202] Optionally, refer to Fig. 9 or Fig.10The storage module 180 includes a storage capacitor C1, and the storage capacitor C1 is connected between the control terminal G of the driving module 110 and the first node S.

[0203] Specifically, the storage capacitor C1 can maintain the voltage of the control terminal G of the driving module 110 to ensure that the driving module 110 can stably generate the driving current. In addition, the storage capacitor C1 can couple the voltage of the second power supply VSS to the control terminal G of the driving module 110, so that the driving current generated by the driving module 110 is independent of the second power supply VSS.

[0204] Optionally, refer to Fig. 9 or Fig.10 The light emitting module 140 includes an organic light emitting diode D1, wherein a first pole of the organic light emitting diode D1 is a first end of the light emitting module 140, and a second pole of the organic light emitting diode D1 is a second end of the light emitting module 140. The first pole of the organic light emitting diode D1 may be an anode, and the second pole of the organic light emitting diode D1 may be a cathode; or the first pole of the organic light emitting diode D1 may be a cathode, and the second pole of the organic light emitting diode D1 may be an anode, which is not limited here.

[0205] On the basis of the above technical solution, the operation of the pixel circuit is described below in combination with the driving timing of the pixel circuit, but this is not intended to limit the present application.

[0206] Optionally, in a data writing frame, the working process of the pixel circuit includes:

[0207] In the first initialization stage, the second initialization transistor is turned on under the control of the second sub-signal, and the first initialization voltage is transmitted to the first node; the threshold compensation transistor is turned on under the control of the third scanning signal, and the third initialization transistor is turned on the control line of the second scanning signal, and the second initialization voltage is transmitted to the control electrode of the driving transistor through the threshold compensation transistor;

[0208] In the data writing and threshold compensation stage, the second initialization transistor is turned on under the control of the second sub-signal, and the first initialization voltage is transmitted to the first node; the data writing transistor is turned on under the control of the fourth scanning signal, and the data voltage on the data line is transmitted to the second electrode of the driving transistor; the threshold compensation transistor is turned on under the control of the third scanning signal, and the storage capacitor is discharged through the threshold compensation transistor, the driving transistor and the data writing transistor, and the threshold compensation is performed on the driving transistor;

[0209] In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current;

[0210] In the data holding frame, the working process of the pixel circuit includes:

[0211] In the second initialization stage, the first initialization transistor is turned on under the control of the first sub-signal to transmit the first initialization voltage to the first node;

[0212] In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current;

[0213] Alternatively, the first initialization module includes a fourth initialization transistor; the control electrode of the fourth initialization transistor is connected to the light emitting control signal;

[0214] In the data writing frame, the working process of the pixel circuit includes:

[0215] In the first initialization stage, the fourth initialization transistor is turned on under the control of the light emitting control signal, and the first initialization voltage is transmitted to the first node; the threshold compensation transistor is turned on under the control of the third scanning signal, and the third initialization transistor is turned on the control line of the second scanning signal, and the second initialization voltage is transmitted to the control electrode of the driving transistor through the threshold compensation transistor;

[0216] In the data writing and threshold compensation stage, the fourth initialization transistor is turned on under the control of the light emitting control signal, and the first initialization voltage is transmitted to the first node; the data writing transistor is turned on under the control of the fourth scanning signal, and the data voltage on the data line is transmitted to the second electrode of the driving transistor; the threshold compensation transistor is turned on under the control of the third scanning signal, and the storage capacitor is discharged through the threshold compensation transistor, the driving transistor and the data writing transistor, and the threshold compensation is performed on the driving transistor;

[0217] In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current;

[0218] In the data holding frame, the working process of the pixel circuit includes:

[0219] In the second initialization stage, the fourth initialization transistor is turned on under the control of the light emitting control signal to transmit the first initialization voltage to the first node;

[0220] In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current.

[0221] In one embodiment, Fig.11 is a driving timing diagram of a pixel circuit provided by an embodiment of the present invention. Optionally, refer to Fig. 9 and Fig.11 ,The driving process of the pixel circuit includes the following stages.

[0222] In the first initialization phase t11 of the data writing frame t1, the second scanning signal S2 is at a low level, the third initialization transistor T3 is turned on, the third scanning signal S3 (the second sub-signal S12) is at a high level, and the threshold compensation transistor T8 and the second initialization transistor T2 are turned on. The light-emitting control signal Em is at a high level, and the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are not turned on. The third initialization transistor T3 transmits the second initialization voltage Vref2 to the control electrode G of the driving transistor T4 through the threshold compensation transistor T8, then the voltage Vn of the first electrode N of the driving transistor T4 is Vref2, and the voltage of the control electrode G of the driving transistor T4 is Vg=Vref2. That is, the voltage at the second end of the storage capacitor C1 is Vref2. The second initialization transistor T2 transmits the first initialization voltage Vref1 to the first end S of the light-emitting module 140, that is, to the first end of the storage capacitor C1, then the voltage at the first end of the storage capacitor C1 is Vs=Vref1.

[0223] In the data writing and threshold compensation phase t12 of the data writing frame t1, the light control signal Em is at a high level, and the first light control transistor T5 and the second light control transistor T6 are not turned on. The third scanning signal S3 (the second sub-signal S12) is at a high level, and the threshold compensation transistor T8 and the second initialization transistor T2 are turned on. The fourth scanning signal S4 (the first sub-signal S11) is at a low level, and the data writing transistor T7 and the first initialization transistor T1 are turned on. The data writing transistor T7 transmits the data voltage Vdata on the data line Data to the second pole D of the driving transistor T4, and the driving transistor T4 is turned on. The voltage at the second end of the storage capacitor C1 is relatively large, and the storage capacitor C1 is discharged through the threshold compensation transistor T8, the driving transistor T4 and the data writing transistor T7 until the voltage at the control pole G of the driving transistor T4 is Vdata+Vth, where Vth is the threshold voltage of the driving transistor T4. The voltage at the first end of the storage capacitor C1 is still the first initialization voltage Vref1. Then the voltage stored in the storage capacitor C1 is Vdata+Vth-Vref1.

[0224] In the light-emitting phase t13 of the data writing frame t1, the light-emitting control signal Em is at a low level, the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are turned on, the first power supply VDD, the first light-emitting control transistor T5, the driving transistor T4, the second light-emitting control transistor T6, the light-emitting module 140 and the second power supply VSS form a current path, and the voltage of the first terminal S of the light-emitting module 140 is Vs=Vss+Voled, that is, the voltage of the first terminal of the storage capacitor C1 is Vss+Voled. Since the voltage stored in the storage capacitor C1 remains unchanged, the voltage of the second terminal of the storage capacitor C1 is Vdata+Vth-Vref1+Vss+Voled, that is, the voltage of the control electrode G of the driving transistor T4 is Vg=Vdata+Vth-Vref1+Vss+Voled, the voltage of the first electrode N of the driving transistor T4 is Vn=Vss+Voled, the voltage difference between the control electrode G of the driving transistor T4 and the first electrode N of the driving transistor T4 is Vdata+Vth-Vref1, and the driving current generated by the driving transistor T4 is In this way, the driving current generated by the driving transistor T4 is only related to the data voltage Vdata and the first initialization voltage Vref1, and is independent of the threshold voltage of the driving transistor T4 and the first power supply VDD and the second power supply VSS, thereby avoiding the fluctuation of the driving current caused by the threshold voltage fluctuation of the driving transistor T4, and avoiding the fluctuation of the driving current caused by the voltage drop of the first power supply VDD or the second power supply VSS, thereby ensuring the stability and accuracy of the driving current, which is beneficial to improving the display effect of the display panel, and further improving the display performance of the display panel.

[0225] In the second initialization phase t22 of the data holding frame t2, the light control signal Em is at a high level, and the first light control transistor T5 and the second light control transistor T6 are not turned on. The fourth scanning signal S4 (the first sub-signal S11) is at a low level, and the first initialization transistor T1 is turned on. The first initialization transistor T1 transmits the first initialization voltage Vref1 to the first end of the light emitting module 140 to initialize the first end of the light emitting module 140.

[0226] It should be noted that in the data holding frame t2, in the period t21 before the second initialization stage t22, the second scanning signal S2 is at a low level, the third initialization transistor T3 is turned on, but the threshold compensation transistor T8 is not turned on, so the control electrode of the driving transistor T4 is not initialized.

[0227] In the second light-emitting stage t23 of the data holding frame t2, the light-emitting control signal Em is at a low level, the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are turned on, the first power supply VDD, the first light-emitting control transistor T5, the driving transistor T4, the second light-emitting control transistor T6, the light-emitting module 140 and the second power supply VSS form a current path, the driving transistor T4 continues to generate a driving current, and the light-emitting module 140 emits light in response to the driving current.

[0228] In this way, it is ensured that the first end of the light emitting module 140 is initialized before each light emission, thereby achieving high-frequency initialization, improving the initialization effect, and further improving the light emitting effect of the light emitting module 140 .

[0229] In another embodiment, Fig.12 is another driving timing diagram of a pixel circuit provided by an embodiment of the present invention. Optionally, refer to Fig.12 and Fig.10 ,The driving process of the pixel circuit includes the following stages.

[0230] In the first initialization phase t11' of the data writing frame t1', the second scanning signal S2 is at a low level, the third initialization transistor T3 is turned on, the third scanning signal S3 is at a high level, and the threshold compensation transistor T8 is turned on. The light-emitting control signal Em is at a high level, the fourth initialization transistor T1' is turned on, and the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are not turned on. The third initialization transistor T3 transmits the second initialization voltage Vref2 to the second pole D of the driving transistor T4, and transmits the second initialization voltage Vref2 to the control pole G of the driving transistor T4 through the threshold compensation transistor T8, then the voltage Vn of the first pole N of the driving transistor T4 is Vref2, and the voltage of the control pole G of the driving transistor T4 is Vg=Vref2. That is, the voltage at the second end of the storage capacitor C1 is Vref2. The fourth initialization transistor T4 transmits the first initialization voltage Vref1 to the first end S of the light-emitting module 140, that is, to the first end of the storage capacitor C1, then the voltage at the first end of the storage capacitor C1 is Vs=Vref1.

[0231] In the data writing and threshold compensation phase t12' of the data writing frame t1', the light control signal Em is at a high level, the fourth initialization transistor T1' is turned on, and the first light control transistor T5 and the second light control transistor T6 are not turned on. The third scanning signal S3 is at a high level, and the threshold compensation transistor T8 is turned on. The fourth scanning signal S4 is at a low level, and the data writing transistor T7 is turned on. The data writing transistor T7 transmits the data voltage Vdata on the data line Data to the second pole D of the driving transistor T4, the driving transistor T4 is turned on, and the voltage at the second end of the storage capacitor C1 is relatively large. The storage capacitor C1 is discharged through the threshold compensation transistor T8, the driving transistor T4 and the data writing transistor T7 until the voltage at the control pole G of the driving transistor T4 is Vdata+Vth, where Vth is the threshold voltage of the driving transistor T4. The voltage at the first end of the storage capacitor C1 is still the first initialization voltage Vref1. Then the voltage stored in the storage capacitor C1 is Vdata+Vth-Vref1.

[0232] In the light-emitting stage t13' of the data writing frame t1', the light-emitting control signal Em is at a low level, the fourth initialization transistor T1' is not turned on, the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are turned on, the first power supply VDD, the first light-emitting control transistor T5, the driving transistor T4, the second light-emitting control transistor T6, the light-emitting module 140 and the second power supply VSS form a current path, and the voltage of the first end S of the light-emitting module 140 is Vs=Vss+Voled, that is, the voltage of the first end of the storage capacitor C1 is Vss+Voled. Since the voltage stored in the storage capacitor C1 remains unchanged, the voltage at the second end of the storage capacitor C1 is Vdata+Vth-Vref1+Vss+Voled, that is, the voltage of the control electrode G of the driving transistor T4 is Vg=Vdata+Vth-Vref1+Vss+Voled, and the voltage of the first electrode N of the driving transistor T4 is Vn=Vss+Voled. The voltage difference between the control electrode G of the driving transistor T4 and the first electrode N of the driving transistor T4 is Vdata+Vth-Vref1, and the driving current generated by the driving transistor T4 is In this way, the driving current generated by the driving transistor T4 is only related to the data voltage Vdata and the first initialization voltage Vref1, and is independent of the threshold voltage of the driving transistor T4 and the first power supply VDD and the second power supply VSS, thereby avoiding the fluctuation of the driving current caused by the threshold voltage fluctuation of the driving transistor T4, and avoiding the fluctuation of the driving current caused by the voltage drop of the first power supply VDD or the second power supply VSS, thereby ensuring the stability and accuracy of the driving current, which is beneficial to improving the display effect of the display panel, and further improving the display performance of the display panel.

[0233] In the second initialization phase t21' of the data holding frame t2', the light control signal Em is at a high level, the fourth initialization transistor T1' is turned on, and the first light control transistor T5 and the second light control transistor T6 are turned off. The fourth initialization transistor T1' transmits the first initialization voltage Vref1 to the first end of the light emitting module 140 to initialize the first end of the light emitting module 140.

[0234] In the second light-emitting stage t22' of the data holding frame t2', the light-emitting control signal Em is at a low level, the fourth initialization transistor T1' is not turned on, the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are turned on, the first power supply VDD, the first light-emitting control transistor T5, the driving transistor T4, the second light-emitting control transistor T6, the light-emitting module 140 and the second power supply VSS form a current path, the driving transistor T4 continues to generate a driving current, and the light-emitting module 140 emits light in response to the driving current. No data is written in the data holding frame.

[0235] In this way, it is ensured that the first end of the light emitting module 140 is initialized before each light emission, thereby achieving high-frequency initialization, improving the initialization effect, and further improving the light emitting effect of the light emitting module 140 .

[0236] In summary, the second scanning signal S2 and the fourth scanning signal S4 are generated by different levels of gate driving circuits in the same shift register. Therefore, the display panel corresponding to the pixel circuit of the present application only needs three groups of shift registers to drive the pixel circuit, which is convenient for reducing the border size of the display panel and achieving a narrow border.

[0237] The embodiment of the present invention further provides a driving method of a pixel circuit. Fig.13 is a flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention, with reference to Fig.13 In a display screen, a driving method of a pixel circuit includes:

[0238] S101. In the initialization stage, the first initialization module responds to the first scanning signal to initialize the first node; wherein a display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; the first scanning signal is the same as the light-emitting control signal on the light-emitting control line, or the first scanning signal includes a first sub-signal and a second sub-signal, and the frequency of the first sub-signal is the same as the frequency of the light-emitting control signal.

[0239] Specifically, by setting the first scanning signal S1 connected to the first initialization module 130 to be the same as the light-emitting control signal on the light-emitting control line EM, that is, the first scanning signal S1 and the light-emitting control signal are the same signal, the frequency of the first scanning signal S1 is the same as the light-emitting control signal, so that the frequency of the first scanning signal S1 is relatively high, so that the first end of the light-emitting module 140 can be initialized at a high frequency, so that the light-emitting module 140 cannot be initialized before emitting light, resulting in fluctuations in the light-emitting brightness of the light-emitting module 140 and flickering, thereby improving the display performance of the display panel. Similarly, by setting the frequency of the first sub-signal to be the same as the frequency of the light-emitting control signal EM, so that the frequency of the first sub-signal is relatively high, the first end (first node S) of the light-emitting module 140 can be initialized at a high frequency, so that the light-emitting module 140 cannot be initialized before emitting light, resulting in fluctuations in the light-emitting brightness of the light-emitting module 140 and flickering, thereby improving the display performance of the display panel formed by the pixel circuit.

[0240] In this way, when the refresh frequency of the display panel formed by the pixel circuit is low, the light-emitting module 140 can be initialized at a high frequency. The light-emitting module 140 can be initialized before each light emission to clear the residual charge left by the previous light emission, thereby improving the accuracy of the light-emitting brightness of the light-emitting module 140 and avoiding brightness fluctuations.

[0241] S102 , in the light-emitting stage, the light-emitting control module controls the driving current generated by the driving module to be transmitted to the light-emitting module, so that the light-emitting module emits light in response to the driving current.

[0242] Specifically, in the light-emitting stage, the light-emitting control module 120 is turned on, and the first power supply VDD, the light-emitting control module 120, the light-emitting module 140 and the second power supply VSS form a current path, so that the driving current generated by the driving module 110 can be transmitted to the light-emitting module 140, so that the light-emitting module 140 can emit light in response to the driving current.

[0243] On the basis of the above technical solution, optionally, a display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; the initialization phase includes a first initialization phase located in the data writing frame and a second initialization phase located in the data holding frame; the light emitting phase includes a first light emitting phase located in the data writing frame and a second light emitting phase located in the data holding frame.

[0244] Fig.14 is a flowchart of another method for driving a pixel circuit provided by an embodiment of the present invention. Optionally, refer to Fig.14 , the driving method of the pixel circuit includes:

[0245] S201 . In a first initialization phase of a data writing frame, a first initialization module initializes a first node in response to a first scanning signal.

[0246] Specifically, refer to Figure 7 or Figure 8 In the first initialization phase of the data writing frame, the first initialization module 130 transmits the first initialization voltage Vref1 to the first terminal S (first node S) of the light emitting module 140, that is, to the first terminal of the storage module 180, and the voltage of the first terminal of the storage module 180 is Vs=Vref1. The second initialization module 150 transmits the second initialization voltage Vref2 to the first terminal N (second node N) of the driving module 110, and transmits it to the control terminal G of the driving module 110 through the threshold compensation module 160, and the voltage of the first terminal N of the driving module 110 is Vn=Vref2, and the voltage of the control terminal G of the driving module 110 is Vg=Vref2. That is, the voltage of the second terminal of the storage module 180 is Vref2.

[0247] S202 . In a threshold compensation phase of a data writing frame, a first initialization module initializes a first node in response to a first scanning signal.

[0248] Specifically, refer to Figure 7 or Figure 8 The first initialization module 130 continues to be turned on in response to the first scan signal S1 to initialize the first end of the light emitting module 140. The first end of the light emitting module 140 is still at the first initialization voltage Vref1, that is, the first end of the storage module 180 is still at the first initialization voltage Vref1.

[0249] S203 , in the first light-emitting stage of the data writing frame, the light-emitting control module controls the driving current generated by the driving module to be transmitted to the light-emitting module, so that the light-emitting module emits light in response to the driving current.

[0250] Specifically, in the first light-emitting stage of the data writing frame, the light-emitting control module 120 is turned on, and the first power supply VDD, the light-emitting control module 120, the driving module 110, the light-emitting module 140 and the second power supply VSS form a current path, and the driving module 110 generates a driving current, so that the light-emitting module 140 emits light in response to the driving current.

[0251] S204 . In the second initialization phase of the data holding frame, the first initialization module initializes the first node in response to the first scanning signal.

[0252] Specifically, in the second initialization phase of the data holding frame, the first initialization module 130 continues to be turned on in response to the first scanning signal S1 to initialize the first end of the light emitting module 140, so that the first end of the light emitting module 140 can also be initialized in the data holding frame.

[0253] S205 , in the second light-emitting stage of the data holding frame, the light-emitting control module controls the driving current generated by the driving module to be transmitted to the light-emitting module, so that the light-emitting module emits light in response to the driving current.

[0254] Specifically, in the second light-emitting stage of the data holding frame, the light-emitting control module 120 is turned on, and the first power supply VDD, the light-emitting control module 120, the driving module 110, the light-emitting module 140 and the second power supply VSS form a current path, and the driving module 110 generates a driving current, so that the light-emitting module 140 emits light in response to the driving current.

[0255] Based on the above technical solutions, Fig.15 is a flowchart of another method for driving a pixel circuit provided by an embodiment of the present invention. Optionally, refer to Fig.15 , the driving method of the pixel circuit includes:

[0256] S301. In a first initialization phase of a data writing frame, a first initialization module initializes a first node in response to a first scanning signal.

[0257] S302, in the data writing and threshold compensation stage of the data writing frame, the first initialization module responds to the first scanning signal to initialize the first node, the data writing module transmits the data voltage on the data line to the control end of the driving module, and the threshold compensation module performs threshold compensation on the driving module.

[0258] Specifically, in the data writing and threshold compensation phase of the data writing frame, the data writing module 170 transmits the data voltage Vdata on the data line Data to the second terminal D of the driving module 110, the driving module 110 is turned on, the voltage at the second terminal of the storage module 180 is relatively large, and the storage module 180 is discharged through the threshold compensation module 160, the driving module 110 and the data writing module 170 until the voltage at the control terminal G of the driving module 110 is Vdata+Vth, where Vth is the threshold voltage of the driving module 110, that is, the threshold voltage of the driving transistor T4 in the driving module 110. The voltage at the first terminal of the storage module 180 is still the first initialization voltage Vref1. Then the voltage stored in the storage module 180 is Vdata+Vth-Vref1.

[0259] S303 , in the first light-emitting stage of the data writing frame, the light-emitting control module controls the driving current generated by the driving module to be transmitted to the light-emitting module, so that the light-emitting module emits light in response to the driving current.

[0260] Specifically, in the first light-emitting stage of the data writing frame, the light-emitting control module 120 is turned on, and the first power supply VDD, the light-emitting control module 120, the driving module 110, the light-emitting module 140 and the second power supply VSS form a current path, and the voltage of the first terminal S of the light-emitting module 140 is Vs=Vss+Voled, that is, the voltage of the first terminal of the storage module 180 is Vss+Voled. Among them, Vss is the second power supply voltage provided by the second power supply VSS, and Voled is the cross voltage of the light-emitting module 140. Since the voltage stored in the storage module 180 remains unchanged, the voltage at the second end of the storage module 180 is Vdata+Vth-Vref1+Vss+Voled, that is, the voltage at the control end G of the driving module 110 is Vg=Vdata+Vth-Vref1+Vss+Voled, and the voltage at the first end N of the driving module 110 is Vn=Vss+Voled. The voltage difference between the control end G of the driving module 110 and the first end N of the driving module 110 is Vdata+Vth-Vref1, and the driving current generated by the driving module 110 is Wherein, μ is the electron mobility of the driving transistor T4 in the driving module 110, Cox is the channel capacitance per unit area of ​​the driving transistor T4, W is the channel width of the driving transistor T4, and L is the channel length of the driving transistor T4. In this way, the driving current generated by the driving module 110 is only related to the data voltage Vdata and the first initialization voltage Vref1, and has nothing to do with the threshold voltage of the driving transistor T4 in the driving module 110, and has nothing to do with the first power supply VDD and the second power supply VSS, so that the fluctuation of the driving current caused by the fluctuation of the threshold voltage of the driving transistor T4 can be avoided, and the fluctuation of the driving current caused by the voltage drop of the first power supply VDD or the second power supply VSS can be avoided, thereby ensuring the stability and accuracy of the driving current, which is conducive to improving the display effect of the display panel, and further improving the display performance of the display panel.

[0261] S304 . In the second initialization phase of the data holding frame, the first initialization module initializes the first node in response to the first scanning signal.

[0262] S305 , in the second light-emitting stage of the data holding frame, the light-emitting control module controls the driving current generated by the driving module to be transmitted to the light-emitting module, so that the light-emitting module emits light in response to the driving current.

[0263] In one implementation, optionally, in the first initialization stage, the first initialization module responds to the first scanning signal to initialize the first end of the first node light emitting module, including:

[0264] In the first initialization stage, the second initialization transistor initializes the first node in response to the second sub-signal.

[0265] Optionally, in the second initialization stage, the first initialization module responds to the first scanning signal to initialize the first node, including:

[0266] In the second initialization stage, the first initialization transistor initializes the first node in response to the first sub-signal.

[0267] The technical solution of the embodiment of the present invention further provides a display panel, Fig.16 is a schematic diagram of a display panel provided by an embodiment of the present invention, with reference to Fig.16 The display panel includes the pixel circuit provided by any of the above embodiments. The display panel can be applied to mobile phones, tablets, displays, smart watches, MP3, MP4 or other wearable devices, etc., because it includes the pixel circuit provided by any embodiment of the present invention, and thus has the same beneficial effects, which will not be described in detail here.

[0268] 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.

[0269] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pixel circuit, characterized in that: include: A driving module, a light emitting control module, a first initialization module and a light emitting module; The driving module and the light-emitting control module are connected in series between the first power supply and the light-emitting module, the driving module is used to generate a driving current, the light-emitting control module is used to control whether the driving current is transmitted to the light-emitting module, and the light-emitting module is used to emit light in response to the driving current; The control end of the light emitting control module is connected to the light emitting control line; The first initialization module and the first end of the light-emitting module are connected to a first node, the control end of the first initialization module is connected to a first scanning signal, and the first initialization module is used to initialize the first node in response to the first scanning signal; wherein, a display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; in the screen display, the first scanning signal is the same as the light-emitting control signal on the light-emitting control line, or the first scanning signal includes a first sub-signal and a second sub-signal, and the frequency of the first sub-signal is the same as the frequency of the light-emitting control signal.

2. The pixel circuit according to claim 1, characterized in that: The first initialization module is used to initialize the first node in response to the first sub-signal and / or the second sub-signal; wherein the frequency of the first sub-signal is greater than the frequency of the second sub-signal; Preferably, the pixel circuit further includes a second initialization module; The second initialization module and the first end of the driving module are connected to the second node, the second initialization module receives a second scanning signal, and the second initialization module is used to initialize the second node and the control end of the driving module in response to the second scanning signal; The second scanning signal has the same waveform as the first sub-signal, and the first sub-signal is delayed relative to the second scanning signal.

3. The pixel circuit according to claim 2, characterized in that: The pixel circuit also includes a threshold compensation module; The threshold compensation module is connected between the second node and the control end of the driving module, and the control end of the threshold compensation module is connected to the third scanning signal; the threshold compensation module is used to perform threshold compensation on the driving module in response to the third scanning signal; Preferably, the second sub-signal is the same as the third scanning signal; Preferably, during the threshold compensation phase of the data writing frame, the threshold compensation module is turned on in response to the third scanning signal; In the first initialization phase of the data writing frame, the second initialization module is turned on in response to the second scanning signal; in the threshold compensation phase of the data writing frame, the first initialization module is turned on in response to the first sub-signal; In the second initialization phase of the data holding frame, the first initialization module is turned on in response to the first sub-signal; in the data holding frame, before the second initialization phase, the second initialization module is turned on in response to the second scanning signal; Preferably, the first sub-signal is delayed by one line time relative to the second scanning signal; Preferably, the first initialization module includes a first initialization transistor and a second initialization transistor; A first electrode of the first initialization transistor is connected to a first initialization voltage, a second electrode of the first initialization transistor is connected to a first end of the light-emitting module, and a control electrode of the first initialization transistor is connected to the first sub-signal; A first electrode of the second initialization transistor is connected to the first initialization voltage, a second electrode of the second initialization transistor is connected to the first node, and a control electrode of the second initialization transistor is connected to the second sub-signal; Preferably, in the first initialization phase of the data writing frame, the second initialization transistor is used to initialize the first node in response to the second sub-signal; Preferably, in the second initialization phase of the data holding frame, the first initialization transistor is used to initialize the first node in response to the first sub-signal; Preferably, the first initialization transistor and the second initialization transistor are of different types; Preferably, the first initialization transistor is a P-type transistor, and the second initialization transistor is an N-type transistor; Preferably, the second initialization module comprises a third initialization transistor, a first electrode of the third initialization transistor and a first end of the driving module are connected to a second node, a second electrode of the third initialization transistor is used to access a second initialization voltage, and a control electrode of the third initialization transistor is used to access the second scanning signal; Preferably, the third initialization transistor is a P-type transistor.

4. The pixel circuit according to claim 1, characterized in that: The first scanning signal and the light emitting control signal are the same signal; The type of transistor in the light emitting control module is different from the type of transistor in the first initialization module; Preferably, in the data writing frame and the data holding frame, the light emitting control signal includes a second effective level; Preferably, the first initialization module includes a fourth initialization transistor; A first electrode of the fourth initialization transistor is connected to a first initialization voltage, a second electrode of the fourth initialization transistor is connected to a first end of the light emitting module, and a control electrode of the fourth initialization transistor is connected to the light emitting control signal; Preferably, the fourth initialization transistor is an N-type transistor.

5. The pixel circuit according to claim 1, characterized in that: The driving module includes a driving transistor; The light emitting control module includes a first light emitting control transistor and a second light emitting control transistor; The first light-emitting control transistor is connected between the first power supply and the second electrode of the driving transistor, and the second light-emitting control transistor is connected between the first electrode of the driving transistor and the first end of the light-emitting module; the control electrode of the first light-emitting control transistor and the control electrode of the second light-emitting control transistor are connected to the light-emitting control line; The active portion of the first light emission control transistor is connected to the active portion of the drive transistor, and the active portion of the second light emission control transistor is connected to the active portion of the drive transistor; The first electrode of the first light emitting control transistor is connected to the second electrode of the driving transistor; Preferably, the second electrode of the driving transistor is connected to the first electrode of the first light emitting control transistor through an active layer; The first electrode of the second light emitting control transistor is connected to the first electrode of the driving transistor; Preferably, the first electrode of the driving transistor is connected to the second electrode of the second light emitting control transistor through an active layer; Preferably, the light emitting control line overlaps with the active portion of the first light emitting control transistor to form a gate of the first light emitting control transistor; the light emitting control line overlaps with the active portion of the second light emitting control transistor to form a gate of the second light emitting control transistor; Preferably, the driving transistor is an N-type transistor; Preferably, the first light emission control transistor and the second light emission control transistor are of the same type.

6. The pixel circuit according to claim 1, characterized in that: The pixel circuit also includes a data writing module; The data writing module is connected between the data line and the second end of the driving module, and the control end of the data writing module is connected to the fourth scanning signal; the data writing module is used to transmit the data voltage on the data line to the second end of the driving module in response to the fourth scanning signal; Preferably, the first sub-signal and the fourth scanning signal are the same signal; Preferably, the data writing module comprises a data writing transistor, the control electrode of the data writing transistor is connected to the fourth scanning signal, the first electrode of the data writing transistor is connected to the data line, and the second electrode of the data writing transistor and the second end of the driving module are connected to the third node; Preferably, the data writing transistor is a P-type transistor.

7. The pixel circuit according to claim 1, characterized in that: The first initialization module is connected to a first initialization voltage; The pixel circuit further includes a second initialization module, a first end of the second initialization module is connected to the first end of the driving module, and a second end of the second initialization module is connected to a second initialization voltage; The second initialization voltage is greater than the sum of the maximum value of the data voltage and the threshold voltage of the driving module; The second end of the light emitting module is connected to a second power supply, and the difference between the first initialization voltage and the voltage of the second power supply is smaller than the turn-on voltage of the light emitting module; Preferably, the second power supply voltage corresponding to the second power supply is zero, the first initialization voltage is greater than zero, and the difference between the first initialization voltage and the voltage of the second power supply is less than the turn-on voltage of the light emitting module; Preferably, the pixel circuit further includes a threshold compensation module and a storage module; The threshold compensation module is connected between the first end of the driving module and the control end of the driving module, and the control end of the threshold compensation module is connected to the third scanning signal; The storage module is connected between the control end of the driving module and the first end of the light emitting module; Preferably, the threshold compensation module comprises a threshold compensation transistor, the threshold compensation transistor is connected between the first end of the driving module and the control end of the driving module, and the control electrode of the threshold compensation transistor is connected to the third scanning signal; Preferably, the storage module comprises a storage capacitor, and the storage capacitor is connected between the control terminal of the driving module and the first node; Preferably, the threshold compensation transistor is an N-type transistor; Preferably, the first initialization module includes a first initialization transistor and a second initialization transistor; the control electrode of the second initialization transistor is connected to the second sub-signal; the second initialization module includes a third initialization transistor, and the control electrode of the third initialization transistor is used to connect to the second scanning signal; the driving module includes a driving transistor; the pixel circuit also includes a data writing module; the data writing module includes a data writing transistor, and the control electrode of the data writing transistor is connected to the fourth scanning signal; The light emitting control module includes a first light emitting control transistor and a second light emitting control transistor; In the data writing frame, the working process of the pixel circuit includes: In the first initialization stage, the second initialization transistor is turned on under the control of the second sub-signal, and the first initialization voltage is transmitted to the first node; the threshold compensation transistor is turned on under the control of the third scanning signal, and the third initialization transistor is turned on the control line of the second scanning signal, and the second initialization voltage is transmitted to the control electrode of the driving transistor through the threshold compensation transistor; In the data writing and threshold compensation stage, the second initialization transistor is turned on under the control of the second sub-signal, and the first initialization voltage is transmitted to the first node; the data writing transistor is turned on under the control of the fourth scanning signal, and the data voltage on the data line is transmitted to the second electrode of the driving transistor; the threshold compensation transistor is turned on under the control of the third scanning signal, and the storage capacitor is discharged through the threshold compensation transistor, the driving transistor and the data writing transistor, and the threshold compensation is performed on the driving transistor; In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current; In the data holding frame, the working process of the pixel circuit includes: In the second initialization stage, the first initialization transistor is turned on under the control of the first sub-signal to transmit the first initialization voltage to the first node; In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current; Alternatively, the first initialization module includes a fourth initialization transistor; the control electrode of the fourth initialization transistor is connected to the light emitting control signal; In the data writing frame, the working process of the pixel circuit includes: In the first initialization stage, the fourth initialization transistor is turned on under the control of the light emitting control signal, and the first initialization voltage is transmitted to the first node; the threshold compensation transistor is turned on under the control of the third scanning signal, and the third initialization transistor is turned on by the control line of the second scanning signal, and the second initialization voltage is transmitted to the control electrode of the driving transistor through the threshold compensation transistor; In the data writing and threshold compensation stage, the fourth initialization transistor is turned on under the control of the light emitting control signal, and the first initialization voltage is transmitted to the first node; the data writing transistor is turned on under the control of the fourth scanning signal, and the data voltage on the data line is transmitted to the second electrode of the driving transistor; the threshold compensation transistor is turned on under the control of the third scanning signal, and the storage capacitor is discharged through the threshold compensation transistor, the driving transistor and the data writing transistor, and the threshold compensation is performed on the driving transistor; In the light-emitting stage, the first light-emitting control transistor and the second light-emitting control transistor are turned on under the control of the light-emitting control signal, the driving transistor generates a driving circuit, and the light-emitting module emits light in response to the driving current; In the data holding frame, the working process of the pixel circuit includes: In the second initialization stage, the fourth initialization transistor is turned on under the control of the light emitting control signal to transmit the first initialization voltage to the first node; In the light emitting stage, the first light emitting control transistor and the second light emitting control transistor are turned on under the control of the light emitting control signal, the driving transistor generates a driving circuit, and the light emitting module emits light in response to the driving current.

8. A method for driving a pixel circuit, characterized in that: The pixel circuit comprises: a driving module, a light emitting control module, a first initialization module and a light emitting module; the driving module and the light emitting control module are connected between a first power source and the light emitting module; the control end of the light emitting control module is connected to a light emitting control line; the first initialization module and the first end of the light emitting module are connected to a first node, and the first initialization module is connected to a first scanning signal; in a display screen, the driving method comprises: In the initialization stage, the first initialization module initializes the first node in response to the first scanning signal; wherein a display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; the first scanning signal is the same as the light emitting control signal on the light emitting control line, or the first scanning signal includes a first sub-signal and a second sub-signal, and the frequency of the first sub-signal is the same as the frequency of the light emitting control signal; In the light-emitting stage, the light-emitting control module controls the driving current generated by the driving module to be transmitted to the light-emitting module, so that the light-emitting module emits light in response to the driving current.

9. The driving method according to claim 8, characterized in that: A display screen of the display panel corresponding to the pixel circuit includes a data writing frame and a data holding frame; the initialization phase includes a first initialization phase located in the data writing frame and a second initialization phase located in the data holding frame; In the first initialization stage, the first initialization module initializes the first node in response to the first scanning signal; In the second initialization stage, the first initialization module initializes the first node in response to the first scanning signal; Preferably, the first initialization module includes a first initialization transistor and a second initialization transistor; the first electrode of the first initialization transistor is connected to the first initialization voltage, the second electrode of the first initialization transistor is connected to the first end of the light-emitting module, and the control electrode of the first initialization transistor is connected to the first sub-signal; A first electrode of the second initialization transistor is connected to the first initialization voltage, a second electrode of the second initialization transistor is connected to the first node, and a control electrode of the second initialization transistor is connected to the second sub-signal; In the first initialization stage, the first initialization module initializes the first end of the first node light emitting module in response to the first scanning signal, including: In the first initialization stage, the second initialization transistor initializes the first node in response to the second sub-signal; In the second initialization stage, the first initialization module initializes the first node in response to the first scanning signal, including: In the second initialization stage, the first initialization transistor initializes the first node in response to the first sub-signal; Preferably, in the data writing frame, the driving method further comprises: In the threshold compensation phase of the data writing frame, the first initialization module initializes the first node in response to the first scanning signal.

10. A display panel, characterized in that: include: The pixel circuit according to any one of claims 1 to 7.

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