Pixel circuit, pixel driving method, display panel and display device

Abstract

Provided are a pixel circuit, a pixel driving method, a display panel and a display device. The pixel circuit comprises a light emitting element (EL), a driving circuit (11), a data writing circuit (12), an on-off control circuit (13), a first initialization circuit (14) and an energy storage circuit (10); the data writing circuit (12) writes a data voltage into a third node (N3) under the control of a first gate driving signal; the on-off control circuit (13) controls the connection between the first node (N1) and the third node (N3) under the control of the first gate driving signal; the first initialization circuit (14) controls the writing of the initialization voltage into the first node (N1) under the control of the first gate driving signal; the type of transistor included in the first initialization circuit (14) is different from the type of driving transistor included in the driving circuit (11), and the type of transistor included in the data writing circuit (12) is different from the type of driving transistor included in the driving circuit (11). The threshold voltage of the driving transistor can be compensated, and the driving power can be reduced to ensure the stability of the potential of the control end of the driving circuit (11).

Description

Technical Field

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

[0002] The related pixel circuits used in display devices generally adopt LTPS (Low Temperature Poly-Silicon) technology, which has high driving power and cannot reduce the leakage current of the transistor electrically connected to the control end of the driving circuit while compensating for the threshold voltage of the driving transistor, so it cannot ensure the stability of the potential of the control end of the driving circuit. Summary of the invention

[0003] The main purpose of the present invention is to provide a pixel circuit, a pixel driving method, a display panel and a display device, which solve the problem that the existing pixel circuit has high driving power and cannot reduce the leakage current of the transistor electrically connected to the control end of the driving circuit while compensating for the threshold voltage of the driving transistor, so as to ensure the stability of the potential of the control end of the driving circuit.

[0004] In one aspect, an embodiment of the present invention provides a pixel circuit, including a light emitting element, a driving circuit, a data writing circuit, an on-off control circuit, a first initialization circuit, and an energy storage circuit;

[0005] The control end of the driving circuit is electrically connected to the first node, the first end of the driving circuit is electrically connected to the second node, and the second end of the driving circuit is electrically connected to the light-emitting element; the driving circuit is used to generate a driving current for driving the light-emitting element to emit light under the control of the potential of the control end;

[0006] The first end of the energy storage circuit is electrically connected to the second node, the second end of the energy storage circuit is electrically connected to the third node, and the energy storage circuit is used to store electrical energy;

[0007] The data writing circuit is electrically connected to the first gate line, the data line and the third node respectively, and is used to write the data voltage on the data line into the third node under the control of the first gate driving signal provided by the first gate line;

[0008] The on-off control circuit is electrically connected to the first gate line, the first node and the third node respectively, and is used to control the connection between the first node and the third node under the control of the first gate driving signal;

[0009] The first initialization circuit is electrically connected to the first gate line, the first node and the initialization voltage terminal respectively, and is used to control the initialization voltage provided by the initialization voltage terminal to be written into the first node under the control of the first gate driving signal;

[0010] The first initialization circuit includes a transistor of a type different from that of a driving transistor included in the driving circuit, and the data writing circuit includes a transistor of a type different from that of a driving transistor included in the driving circuit.

[0011] Optionally, the driving transistor is a low-temperature polysilicon transistor, and the transistor included in the first initialization circuit and the transistor included in the data writing circuit are both oxide transistors.

[0012] Optionally, the type of transistor included in the on-off control circuit is the same as the type of driving transistor included in the driving circuit.

[0013] Optionally, the pixel circuit described in at least one embodiment of the present invention further includes a second initialization circuit; the second end of the driving circuit is electrically connected to the first electrode of the light-emitting element, and the second electrode of the light-emitting element is electrically connected to the first voltage end;

[0014] The second initialization circuit is electrically connected to the second gate line, the initialization voltage terminal and the first electrode of the light-emitting element respectively, and is used to write the initialization voltage into the first electrode of the light-emitting element under the control of the second gate drive signal provided by the second gate line to control the light-emitting element not to emit light.

[0015] Optionally, the type of transistor included in the second initialization circuit is the same as the type of the driving transistor.

[0016] Optionally, the pixel circuit described in at least one embodiment of the present invention also includes a first light-emitting control circuit; the first light-emitting control circuit is electrically connected to the second node, the power supply voltage terminal and the first light-emitting control line, respectively, and is used to control the connection between the power supply voltage terminal and the second node under the control of a first light-emitting control signal provided by the first light-emitting control line.

[0017] Optionally, the pixel circuit described in at least one embodiment of the present invention further includes a second light emitting control circuit; the second end of the driving circuit is electrically connected to the light emitting element through the second light emitting control circuit;

[0018] The second light-emitting control circuit is also electrically connected to a second light-emitting control line, and is used to control the connection between the second end of the driving circuit and the light-emitting element under the control of a second light-emitting control signal provided by the second light-emitting control line.

[0019] Optionally, the driving circuit includes a driving transistor, the data writing circuit includes a data writing transistor, the on-off control circuit includes an on-off control transistor, the first initialization circuit includes a first initialization transistor, and the energy storage circuit includes a storage capacitor;

[0020] The control electrode of the driving transistor is electrically connected to the first node, the first electrode of the driving transistor is electrically connected to the second node, and the second electrode of the driving transistor is electrically connected to the light emitting element;

[0021] The first end of the storage capacitor is electrically connected to the second node, and the second end of the storage capacitor is electrically connected to the third node;

[0022] The control electrode of the data writing transistor is electrically connected to the first gate line, the first electrode of the data writing transistor is electrically connected to the data line, and the second electrode of the data writing transistor is electrically connected to the third node;

[0023] The control electrode of the on-off control transistor is electrically connected to the first gate line, the first electrode of the on-off control transistor is electrically connected to the third node, and the second electrode of the on-off control transistor is electrically connected to the first node;

[0024] A control electrode of the first initialization transistor is electrically connected to the first gate line, a first electrode of the first initialization transistor is electrically connected to the initialization voltage terminal, and a second electrode of the first initialization transistor is electrically connected to the first node.

[0025] Optionally, the second initialization circuit includes a second initialization transistor;

[0026] The control electrode of the second initialization transistor is electrically connected to the second gate line, the first electrode of the second initialization transistor is electrically connected to the initialization voltage terminal, and the second electrode of the second initialization transistor is electrically connected to the first electrode of the light emitting element;

[0027] The second initialization transistor is a low temperature polysilicon transistor.

[0028] Optionally, the first light emitting control circuit includes a first light emitting control transistor;

[0029] The control electrode of the first light emission control transistor is electrically connected to the first light emission control line, the first electrode of the first light emission control transistor is electrically connected to the power supply voltage terminal, and the second electrode of the first light emission control transistor is electrically connected to the second node;

[0030] The first light emission control transistor is a low temperature polysilicon transistor.

[0031] Optionally, the second light emitting control circuit includes a second light emitting control transistor;

[0032] The control electrode of the second light emitting control transistor is electrically connected to the second light emitting control line, the first electrode of the second light emitting control transistor is electrically connected to the second end of the driving circuit, and the second electrode of the second light emitting control transistor is electrically connected to the light emitting element;

[0033] The second light emission control transistor is a low temperature polysilicon transistor.

[0034] In a second aspect, an embodiment of the present invention further provides a pixel driving method, which is applied to the above-mentioned pixel circuit, wherein a display cycle includes a compensation phase and a writing phase which are arranged in sequence; the pixel driving method includes:

[0035] In the compensation stage, the data writing circuit writes the data voltage on the data line to the third node under the control of the first gate driving signal; the first initialization circuit writes the initialization voltage V0 to the first node under the control of the first gate driving signal; the energy storage circuit is charged by the data voltage so that the potential of the second node eventually becomes V0-Vth, where Vth is the threshold voltage of the driving transistor included in the driving circuit;

[0036] In the writing phase, the on-off control circuit controls the connection between the first node and the third node under the control of the first gate driving signal, so as to write the data voltage into the first node.

[0037] Optionally, the pixel circuit further includes a first light-emitting control circuit; the display cycle further includes a light-emitting stage arranged after the writing stage; the pixel driving method further includes: in the compensation stage, the driving circuit controls the connection between the first end of the driving circuit and the second end of the driving circuit under the control of the initialization voltage V0 connected to the control end thereof, charges the energy storage circuit through the data voltage to change the potential of the second node, until the potential of the second node becomes V0-Vth, and the driving circuit disconnects the connection between the first end and the second end of the driving circuit;

[0038] In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, the on-off control circuit controls the connection between the first node and the third node under the control of the first gate drive signal, and the drive circuit controls the generation of a drive current that drives the light-emitting element to emit light under the control of the potential of its control terminal.

[0039] Optionally, the pixel circuit further includes a first light emitting control circuit and a second light emitting control circuit; the display cycle further includes a light emitting phase arranged after the writing phase; the compensation phase includes a first compensation time period and a second compensation time period; the pixel driving method further includes:

[0040] In the first compensation time period, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, so as to write the power supply voltage into the second node;

[0041] In the second compensation time period, the second light-emitting control circuit controls the second end of the driving circuit to be connected to the light-emitting element under the control of the second light-emitting control signal, and the driving circuit controls the first end of the driving circuit to be connected to the second end of the driving circuit under the control of the initialization voltage V0 connected to the control end thereof, and charges the energy storage circuit through the data voltage to change the potential of the second node until the potential of the second node becomes V0-Vth, and the driving circuit disconnects the first end thereof from the second end of the driving circuit;

[0042] In the writing stage, the second light emitting control circuit controls the second end of the driving circuit to be connected to the light emitting element under the control of the second light emitting control signal;

[0043] In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, and the second light-emitting control circuit controls the conduction between the second terminal of the driving circuit and the light-emitting element under the control of the second light-emitting control signal, and the driving circuit drives the light-emitting element to emit light.

[0044] Optionally, the pixel circuit further includes a second initialization circuit; and the pixel driving method further includes:

[0045] In the compensation stage, the second initialization circuit writes the initialization voltage into the first electrode of the light-emitting element under the control of the second gate driving signal to control the light-emitting element not to emit light.

[0046] In a third aspect, the present invention further provides a display panel comprising the above-mentioned pixel circuit.

[0047] In a fourth aspect, the present invention further provides a display device, comprising the above-mentioned display panel.

[0048] The pixel circuit, pixel driving method, display panel and display device described in the embodiments of the present invention set the type of transistor included in the first initialization circuit to be different from the type of driving transistor included in the driving circuit, and set the type of transistor included in the data writing circuit to be different from the type of driving transistor included in the driving circuit. The embodiments of the present invention can compensate for the threshold voltage of the driving transistor and reduce the driving power, thereby ensuring the stability of the potential of the control end of the driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0050] Figure 2 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0051] Figure 3 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0052] Figure 4 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0053] Figure 5 is a circuit diagram of a pixel circuit according to at least one embodiment of the present invention;

[0054] Figure 6 Is the invention Figure 5 An operation timing diagram of at least one embodiment of the pixel circuit shown;

[0055] Figure 7 is a circuit diagram of a pixel circuit according to at least one embodiment of the present invention;

[0056] Figure 8 Inventions such as Figure 7 An operating timing diagram of at least one embodiment of a pixel circuit is shown. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0058] The transistors used in all embodiments of the present invention may be triodes, thin film transistors, field effect transistors or other devices with the same characteristics. In the embodiments of the present invention, in order to distinguish the two electrodes of the transistor except the control electrode, one of the electrodes is called the first electrode and the other is called the second electrode.

[0059] In actual operation, when the transistor is a triode, the control electrode may be a base, the first electrode may be a collector, and the second electrode may be an emitter; or, the control electrode may be a base, the first electrode may be an emitter, and the second electrode may be a collector.

[0060] In actual operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode can be a gate, the first electrode can be a drain, and the second electrode can be a source; or, the control electrode can be a gate, the first electrode can be a source, and the second electrode can be a drain.

[0061] like Figure 1 As shown, the pixel circuit according to at least one embodiment of the present invention includes a light emitting element EL, a driving circuit 11, a data writing circuit 12, an on-off control circuit 13, a first initialization circuit 14 and an energy storage circuit 10;

[0062] The control end of the driving circuit 11 is electrically connected to the first node N1, the first end of the driving circuit 11 is electrically connected to the second node N2, and the second end of the driving circuit 11 is electrically connected to the light emitting element EL; the driving circuit 11 is used to generate a driving current for driving the light emitting element EL to emit light under the control of the potential of the control end thereof;

[0063] The first end of the energy storage circuit 10 is electrically connected to the second node N2, the second end of the energy storage circuit 10 is electrically connected to the third node N3, and the energy storage circuit 10 is used to store electrical energy;

[0064] The data writing circuit 12 is electrically connected to the first gate line G1, the data line D1 and the third node N3 respectively, and is used to write the data voltage on the data line D1 into the third node N3 under the control of the first gate driving signal provided by the first gate line G1;

[0065] The on-off control circuit 13 is electrically connected to the first gate line G1, the first node N1 and the third node N3 respectively, and is used to control the connection between the first node N1 and the third node N3 under the control of the first gate driving signal;

[0066] The first initialization circuit 14 is electrically connected to the first gate line G1, the first node N1 and the initialization voltage terminal respectively, and is used to control the initialization voltage V0 provided by the initialization voltage terminal to be written into the first node N1 under the control of the first gate driving signal;

[0067] The type of transistor included in the first initialization circuit 14 is different from the type of driving transistor included in the driving circuit 11 , and the type of transistor included in the data writing circuit 12 is different from the type of driving transistor included in the driving circuit 11 .

[0068] In a specific implementation, the transistors included in the first initialization circuit 14 and the transistors included in the data writing circuit 12 can both be oxide transistors, and the transistors included in the on-off control circuit 13 and the driving transistors can both be LTPS (Low Temperature Poly-Silicon) transistors, but not limited to this.

[0069] In actual operation, the transistors included in the first initialization circuit 14 and the transistors included in the data writing circuit 12 are set as oxide transistors. Since the leakage current of oxide transistors is small, the stability of the potential of N1 can be guaranteed.

[0070] The pixel circuit described in at least one embodiment of the present invention can adopt a source follower method to write the threshold voltage of the driving transistor into the second node N2, and then write the threshold voltage into the first node N1 through the jump of the potential of the second node N2, thereby finally compensating the threshold voltage of the driving transistor.

[0071] The pixel circuit described in the present invention is an LTPO (Low Temperature Polycrystalline Oxide) pixel circuit, which can reduce driving power.

[0072] In the related art, the LTPO pixel circuit has lower driving power than the LTPS pixel circuit. The LTPS pixel circuit needs to adopt a scanning frequency of up to 60Hz to display a still image, while the LTPO pixel circuit only needs to adopt a lower scanning frequency (for example, the scanning frequency can be 1Hz) to display a still image, which can greatly reduce the driving frequency.

[0073] Optionally, the driving transistor is a low-temperature polysilicon transistor, and the transistor included in the first initialization circuit and the transistor included in the data writing circuit are both oxide transistors.

[0074] In a specific implementation, the type of transistor included in the on-off control circuit and the type of driving transistor included in the driving circuit may be the same, but the present invention is not limited thereto.

[0075] In at least one embodiment of the present invention, the pixel circuit further includes a second initialization circuit; the second end of the driving circuit is electrically connected to the first electrode of the light emitting element, and the second electrode of the light emitting element is electrically connected to the first voltage end;

[0076] The second initialization circuit is electrically connected to the second gate line, the initialization voltage terminal and the first electrode of the light-emitting element respectively, and is used to write the initialization voltage into the first electrode of the light-emitting element under the control of the second gate drive signal provided by the second gate line to control the light-emitting element not to emit light.

[0077] In at least one embodiment of the present invention, the first voltage terminal may be a ground terminal or a low voltage terminal, but is not limited thereto.

[0078] like Figure 2 As shown, in Figure 1 Based on at least one embodiment of the pixel circuit shown, the pixel circuit according to at least one embodiment of the present invention may further include a second initialization circuit 20;

[0079] The second terminal of the driving circuit 11 is electrically connected to the first electrode of the light emitting element EL, and the second electrode of the light emitting element EL is electrically connected to the first voltage terminal V1;

[0080] The second initialization circuit 20 is electrically connected to the second gate line G2, the initialization voltage terminal and the first electrode of the light-emitting element EL, respectively, and is used to write the initialization voltage V0 into the first electrode of the light-emitting element EL under the control of the second gate driving signal provided by the second gate line G2, so as to control the light-emitting element EL not to emit light.

[0081] The present invention Figure 2 When at least one embodiment of the pixel circuit is in operation, in the compensation stage, the second initialization circuit 20 writes the initialization voltage V0 into the first electrode of the light-emitting element EL under the control of the second gate driving signal provided by the second gate line G2 to control the light-emitting element EL not to emit light.

[0082] In a specific implementation, the light emitting element EL may be an organic light emitting diode, the first electrode of the light emitting element EL may be an anode of the organic light emitting diode, and the second electrode of the light emitting element EL may be a cathode of the organic light emitting diode, but the present invention is not limited thereto.

[0083] Optionally, the type of transistor included in the second initialization circuit is the same as the type of the driving transistor.

[0084] For example, the transistor included in the second initialization circuit may be a low temperature polysilicon transistor, but is not limited thereto.

[0085] In specific implementation, Figure 3 As shown, in Figure 2Based on at least one embodiment of the pixel circuit shown, the pixel circuit according to at least one embodiment of the present invention further includes a first light emitting control circuit 31;

[0086] The first light-emitting control circuit 31 is electrically connected to the second node N2, the power supply voltage terminal V2 and the first light-emitting control line E1 respectively, and is used to control the connection between the power supply voltage terminal V2 and the second node N2 under the control of a first light-emitting control signal provided by the first light-emitting control line E1.

[0087] The present invention Figure 3 When at least one embodiment of the pixel circuit shown is in operation, a display cycle includes a compensation phase, a writing phase and a light emitting phase arranged in sequence;

[0088] In the compensation stage, the data writing circuit writes the data voltage on the data line into the third node under the control of the first gate driving signal; the first initialization circuit writes the initialization voltage V0 into the first node under the control of the first gate driving signal; the second initialization circuit writes the initialization voltage V0 into the first pole of the light-emitting element under the control of the second gate driving signal provided by the second gate line to control the light-emitting element not to emit light; the driving circuit controls the first end of the driving circuit to be connected with the second end of the driving circuit under the control of the initialization voltage V0 connected to the control end thereof, charges the energy storage circuit through the data voltage, so as to change the potential of the second node, until the potential of the second node becomes V0-Vth, and the driving circuit disconnects the connection between the first end thereof and the second end of the driving circuit;

[0089] In the writing phase, the on-off control circuit controls the connection between the first node and the third node under the control of the first gate driving signal, so as to write the data voltage into the first node;

[0090] In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, the on-off control circuit controls the connection between the first node and the third node under the control of the first gate drive signal, and the drive circuit controls the generation of a drive current that drives the light-emitting element to emit light under the control of the potential of its control terminal.

[0091] Optionally, the pixel circuit described in at least one embodiment of the present invention may further include a second light emitting control circuit; the second end of the driving circuit is electrically connected to the light emitting element through the second light emitting control circuit;

[0092] The second light-emitting control circuit is also electrically connected to a second light-emitting control line, and is used to control the connection between the second end of the driving circuit and the light-emitting element under the control of a second light-emitting control signal provided by the second light-emitting control line.

[0093] In a specific implementation, the pixel circuit described in at least one embodiment of the present invention may include two light emitting control circuits to control the path of the driving circuit driving the light emitting element to emit light.

[0094] In specific implementation, Figure 4 As shown, in Figure 2 Based on at least one embodiment of the pixel circuit shown, the pixel circuit according to at least one embodiment of the present invention further includes a first light emitting control circuit 31 and a second light emitting control circuit 32;

[0095] The first light emitting control circuit 31 is electrically connected to the second node N2, the power supply voltage terminal V2 and the first light emitting control line E1 respectively, and is used to control the connection between the power supply voltage terminal V2 and the second node N2 under the control of the first light emitting control signal provided by the first light emitting control line E1;

[0096] The second light-emitting control circuit 32 is electrically connected to the second light-emitting control line E2, the second end of the driving circuit 11 and the first pole of the light-emitting element EL, respectively, and is used to control the connection between the second end of the driving circuit 11 and the first pole of the light-emitting element EL under the control of a second light-emitting control signal provided by the second light-emitting control line.

[0097] The present invention Figure 4 When at least one embodiment of the pixel circuit shown is in operation, the display cycle further includes a compensation phase, a writing phase and a light emitting phase which are arranged in sequence; the compensation phase includes a first compensation time period and a second compensation time period;

[0098] In the compensation stage, the data writing circuit 12 writes the data voltage Vd on the data line to the third node N3 under the control of the first gate driving signal; the first initialization circuit 14 writes the initialization voltage V0 to the first node N1 under the control of the first gate driving signal; the second initialization circuit writes the initialization voltage V0 to the first electrode of the light-emitting element under the control of the second gate driving signal provided by the second gate line to control the light-emitting element not to emit light;

[0099] In the first compensation time period, the first light-emitting control circuit 31 controls the connection between the power supply voltage terminal V2 and the second node N2 under the control of the first light-emitting control signal; the second light-emitting control circuit 32 controls the disconnection between the second terminal of the driving circuit 11 and the first electrode of the light-emitting element EL under the control of the second light-emitting control signal;

[0100] In the second compensation time period and writing stage, the first light-emitting control circuit 31 controls the power supply voltage terminal V2 and the second node N2 to be disconnected under the control of the first light-emitting control signal; the second light-emitting control circuit 32 controls the second terminal of the driving circuit 11 and the first electrode of the light-emitting element EL to be connected under the control of the second light-emitting control signal;

[0101] In the second compensation time period, the driving circuit 11 controls the connection between the first end of the driving circuit 11 and the second end of the driving circuit 11 under the control of the initialization voltage V0 connected to the control end thereof, and charges the energy storage circuit 10 through the data voltage Vd to change the potential of the second node N2, until the potential of the second node N2 becomes V0-Vth, and the driving circuit 11 disconnects the connection between the first end and the second end of the driving circuit 11;

[0102] In the light-emitting stage, the first light-emitting control circuit 31 controls the connection between the power supply voltage terminal V2 and the second node N2 under the control of the first light-emitting control signal provided by the first light-emitting control line E1, and the second light-emitting control circuit 32 controls the conduction between the second end of the driving circuit 11 and the first pole of the light-emitting element EL under the control of the second light-emitting control signal, so that the driving circuit 11 can drive the light-emitting element EL to emit light.

[0103] In a specific implementation, the driving circuit may include a driving transistor, the data writing circuit may include a data writing transistor, the on-off control circuit may include an on-off control transistor, the first initialization circuit may include a first initialization transistor, and the energy storage circuit may include a storage capacitor;

[0104] The control electrode of the driving transistor is electrically connected to the first node, the first electrode of the driving transistor is electrically connected to the second node, and the second electrode of the driving transistor is electrically connected to the light emitting element;

[0105] The first end of the storage capacitor is electrically connected to the second node, and the second end of the storage capacitor is electrically connected to the third node;

[0106] The control electrode of the data writing transistor is electrically connected to the first gate line, the first electrode of the data writing transistor is electrically connected to the data line, and the second electrode of the data writing transistor is electrically connected to the third node;

[0107] The control electrode of the on-off control transistor is electrically connected to the first gate line, the first electrode of the on-off control transistor is electrically connected to the third node, and the second electrode of the on-off control transistor is electrically connected to the first node;

[0108] A control electrode of the first initialization transistor is electrically connected to the first gate line, a first electrode of the first initialization transistor is electrically connected to the initialization voltage terminal, and a second electrode of the first initialization transistor is electrically connected to the first node.

[0109] Optionally, the second initialization circuit includes a second initialization transistor;

[0110] The control electrode of the second initialization transistor is electrically connected to the second gate line, the first electrode of the second initialization transistor is electrically connected to the initialization voltage terminal, and the second electrode of the second initialization transistor is electrically connected to the first electrode of the light emitting element;

[0111] The second initialization transistor is a low temperature polysilicon transistor.

[0112] Optionally, the first light emitting control circuit includes a first light emitting control transistor;

[0113] The control electrode of the first light emission control transistor is electrically connected to the first light emission control line, the first electrode of the first light emission control transistor is electrically connected to the power supply voltage terminal, and the second electrode of the first light emission control transistor is electrically connected to the second node;

[0114] The first light emission control transistor is a low temperature polysilicon transistor.

[0115] Optionally, the second light emitting control circuit includes a second light emitting control transistor;

[0116] The control electrode of the second light emitting control transistor is electrically connected to the second light emitting control line, the first electrode of the second light emitting control transistor is electrically connected to the second end of the driving circuit, and the second electrode of the second light emitting control transistor is electrically connected to the light emitting element;

[0117] The second light emission control transistor is a low temperature polysilicon transistor.

[0118] like Figure 5 As shown, the pixel circuit according to at least one embodiment of the present invention includes an organic light emitting diode O1, a driving circuit 11, a data writing circuit 12, an on-off control circuit 13, a first initialization circuit 14, an energy storage circuit 10, a second initialization circuit 20 and a first light emitting control circuit 31;

[0119] The driving circuit 11 includes a driving transistor T3, the data writing circuit 12 includes a data writing transistor T2, the on-off control circuit 13 includes an on-off control transistor T4, the first initialization 14 may include a first initialization transistor T1, the energy storage circuit 10 includes a storage capacitor C1; the second initialization circuit 20 includes a second initialization transistor T6, and the first light emitting control circuit 31 includes a first light emitting control transistor T5;

[0120] The gate of the driving transistor T3 is electrically connected to the first node N1, the source of the driving transistor T3 is electrically connected to the second node N2, the drain of the driving transistor T3 is electrically connected to the anode of O1; the cathode of O1 is connected to the low voltage VSS;

[0121] The first end of the storage capacitor C1 is electrically connected to the second node N2, and the second end of the storage capacitor C1 is electrically connected to the third node N3;

[0122] The gate of the data writing transistor T2 is electrically connected to the first gate line G1, the drain of the data writing transistor T2 is electrically connected to the data line D1, and the source of the data writing transistor T2 is electrically connected to the third node N3;

[0123] The gate of the on-off control transistor T4 is electrically connected to the first gate line G1, the source of the on-off control transistor T4 is electrically connected to the third node N3, and the drain of the on-off control transistor T4 is electrically connected to the first node N1;

[0124] The gate of the first initialization transistor T1 is electrically connected to the first gate line G1, the drain of the first initialization transistor T1 is electrically connected to the initialization voltage terminal, and the source of the first initialization transistor T1 is electrically connected to the first node N1; the initialization voltage terminal is used to provide an initialization voltage V0;

[0125] The gate of the second initialization transistor T6 is electrically connected to the second gate line G2, the source of the second initialization transistor T6 is electrically connected to the drain of the driving transistor T3, and the source of the second initialization transistor T6 is electrically connected to the anode of O1;

[0126] The gate of the first light-emitting control transistor T5 is electrically connected to the first light-emitting control line E1, the source of the first light-emitting control transistor T5 is electrically connected to the power supply voltage terminal V2, and the drain of the first light-emitting control transistor T5 is electrically connected to the second node N2; the power supply voltage terminal V2 is used to provide a power supply voltage V02.

[0127] exist Figure 5 Among them, the node labeled N4 is the fourth node electrically connected to the anode of O1.

[0128] exist Figure 5 In the pixel circuit according to at least one embodiment of the present invention shown, T1 and T2 are n-type transistors, and T3, T4, T5 and T6 are p-type transistors;

[0129] T1 and T2 are oxide transistors, and T3, T4, T5 and T6 are low temperature polysilicon transistors.

[0130] In a specific implementation, T1 and T2 are set as oxide transistors, and the leakage current of the oxide transistors is small, so that the potential of N1 and the potential of N3 can be well maintained in the light-emitting stage.

[0131] The present invention Figure 5 At least one embodiment of the pixel circuit shown can achieve threshold voltage compensation and light emission by using three scanning signals (the three scanning signals may be: a first gate driving signal, a second gate driving signal and a first light emitting control signal) when in operation.

[0132] like Figure 6 As shown, the present invention is Figure 5 When at least one embodiment of the pixel circuit shown is in operation, a display cycle may include a compensation phase S1, a writing phase S2, and a light emitting phase S3 which are arranged in sequence;

[0133] In the compensation stage S1, G2 provides a low voltage signal, G1 provides a high voltage signal, E1 provides a high voltage signal, the data line D1 provides a data voltage Vd, T2 is turned on, T1 is turned on, and T6 is turned on to provide V0 to the anode of O1, so that O1 does not emit light; and the data voltage Vd provided by the data line D1 is provided to N3, and V0 is provided to N1 and N4, so that the potential of N1 is V0, and the potential of N3 is Vd; at the beginning of the compensation stage S1, T3 can be turned on, and Vd charges C1 through the turned-on T2 to increase the potential of N2 until the potential of N2 becomes V0-Vth, T3 is turned off, and charging stops, and the potential of N2 remains at V0-Vth, where Vth is the threshold voltage of T3;

[0134] In the writing phase S2, G2 provides a high voltage signal, G1 provides a low voltage signal, E1 provides a high voltage signal, T6 is closed, T4 is opened, N1 and N3 are connected to write the data voltage Vd into N1, the potential of N1 becomes Vd, and the potential of N2 remains at V0-Vth;

[0135] In the light-emitting stage S3, G2 provides a high voltage signal, G1 provides a low voltage signal, E1 provides a low voltage signal, T6 is closed, T4 is opened, N1 and N3 are connected, T5 is opened, so that the potential of N2 jumps to V02; since the voltage difference across C1 cannot change suddenly, the potential of N1 and the potential of N3 both become Vd+V02-V0+Vth; T3 is opened to drive O1 to emit light;

[0136] In the light-emitting stage S3, the current value I1 of the driving current flowing through T3 is as follows:

[0137] I1=K(Vd-V0)2; where K is the current coefficient of T3;

[0138] It can be seen from the formula of I1 that the current value I1 of the driving current is independent of Vth and V02, and the threshold voltage can be compensated, and the driving current is made independent of the power supply voltage.

[0139] like Figure 7 As shown, the pixel circuit according to at least one embodiment of the present invention includes an organic light emitting diode, a driving circuit 11, a data writing circuit 12, an on-off control circuit 13, a first initialization circuit 14, an energy storage circuit 10, a second initialization circuit 20, a first light emitting control circuit 31 and a second light emitting control circuit 32;

[0140] The driving circuit 11 includes a driving transistor T3, the data writing circuit 12 includes a data writing transistor T2, the on-off control circuit 13 includes an on-off control transistor T4, the first initialization circuit 14 includes a first initialization transistor T1, and the energy storage circuit 10 includes a storage capacitor C1; the second initialization circuit 20 includes a second initialization transistor T6; the first light-emitting control circuit 31 includes a first light-emitting control transistor T5; the second light-emitting control circuit 31 includes a second light-emitting control transistor T7;

[0141] The gate of the driving transistor T3 is electrically connected to the first node N1, the source of the driving transistor T3 is electrically connected to the second node N2, and the drain of the driving transistor T3 is electrically connected to the source of T7;

[0142] The first end of the storage capacitor C1 is electrically connected to the second node N2, and the second end of the storage capacitor C1 is electrically connected to the third node N3;

[0143] The gate of the data writing transistor T2 is electrically connected to the first gate line G1, the drain of the data writing transistor T2 is electrically connected to the data line D1, and the source of the data writing transistor T2 is electrically connected to the third node N3;

[0144] The gate of the on-off control transistor T4 is electrically connected to the first gate line G1, the source of the on-off control transistor T4 is electrically connected to the third node N3, and the drain of the on-off control transistor T4 is electrically connected to the first node N1;

[0145] The gate of the first initialization transistor T1 is electrically connected to the first gate line G1, the drain of the first initialization transistor T1 is electrically connected to the initialization voltage terminal, and the source of the first initialization transistor T1 is electrically connected to the first node N1; the initialization voltage terminal is used to provide an initial voltage V0;

[0146] The gate of the second initialization transistor T6 is electrically connected to the second gate line G2, the source of the second initialization transistor T6 is electrically connected to the initialization voltage terminal, and the drain of the second initialization transistor T6 is electrically connected to the anode of O1;

[0147] The gate of the first light-emitting control transistor T5 is electrically connected to the first light-emitting control line E1, the source of the first light-emitting control transistor T5 is electrically connected to the power supply voltage terminal V2, and the drain of the first light-emitting control transistor T5 is electrically connected to the second node N2; the power supply voltage terminal V2 is used to provide a power supply voltage V02;

[0148] The gate of the second light emitting control transistor T7 is electrically connected to the second light emitting control line E2, the source of the second light emitting control transistor T7 is electrically connected to the drain of the driving transistor T3, and the drain of the second light emitting control transistor T7 is electrically connected to the anode of O1;

[0149] The cathode of O1 is connected to the low voltage VSS.

[0150] exist Figure 7 Among them, the node labeled N4 is the fourth node electrically connected to the anode of O1.

[0151] exist Figure 7 In the pixel circuit according to at least one embodiment of the present invention shown, T1 and T2 are n-type transistors, and T3, T4, T5, T6 and T7 are p-type transistors;

[0152] T1 and T2 are oxide transistors, and T3, T4, T5, T6 and T7 are low temperature polysilicon transistors.

[0153] In a specific implementation, T1 and T2 are set as oxide transistors, and the leakage current of the oxide transistors is small, so that the potential of N1 and the potential of N3 can be well maintained in the light-emitting stage.

[0154] The present invention Figure 7When at least one embodiment of the pixel circuit shown is in operation, four scanning signals (the four scanning signals may be: a first gate driving signal, a second gate driving signal, a first light-emitting control signal and) are used to achieve threshold voltage compensation and light-emitting.

[0155] like Figure 8 As shown, the present invention is Figure 7 When at least one embodiment of the pixel circuit shown is in operation, a display cycle may include a compensation phase, a writing phase S2 and a light emitting phase S3 arranged in sequence; the compensation phase includes a first compensation time period S11 and a second compensation time period S12;

[0156] In the first compensation period S11, G2 provides a low voltage signal, G1 provides a high voltage signal, E1 provides a low voltage signal, E2 provides a high voltage signal, and the data line D1 provides a data voltage Vd; T6 is turned on, T2 and T1 are turned on, T5 is turned on, the potential of N3 becomes Vd, and the potential of N2 becomes V02; the potential of N1 is V0, so that T3 can be turned on at the beginning of the second compensation period S12; the potential of N4 is V0, so that O1 does not emit light;

[0157] In the second compensation period S12, G2 provides a low voltage signal, G1 provides a high voltage signal, E1 provides a high voltage signal, E2 provides a low voltage signal, the data line D1 provides a data voltage Vd, T5 is turned off, T6 is turned on, T7 is turned on, T2 is turned on, T1 is turned on, Vd charges C1 through the turned-on T2 to increase the potential of N2 until the potential of N2 becomes V0-Vth, where Vth is the threshold voltage of T3;

[0158] In the write phase S2, G2 provides a high voltage signal, G1 provides a low voltage signal, E2 provides a low voltage signal, E1 provides a high voltage signal, T6 is turned off, T7 is turned on, T5 is turned off, T2 is turned off, T4 is turned on, T1 is turned off, N1 and N3 are connected, the potential of N2 is maintained at V0-Vth, and the potential of N1 and the potential of N3 are both Vd;

[0159] In the light-emitting stage S3, G2 provides a high voltage signal, G1 provides a low voltage signal, E2 provides a low voltage signal, E1 provides a low voltage signal, T6 is turned off, T1 and T2 are turned off, T4 is turned on, T5 and T7 are turned on, and the potential of N2 jumps from V0-Vth to V02. Since the voltage difference across C1 cannot change suddenly, the potential of N3 becomes Vd+V02-V0+Vth, and the potential of N1 also becomes Vd+V02-V0+Vth. T3 is turned on to drive O1 to emit light;

[0160] In the light-emitting stage S3, the current value I1 of the driving current flowing through T3 is as follows:

[0161] I1=K(Vd-V0)2; where K is the current coefficient of T3;

[0162] It can be seen from the formula of I1 that the current value I1 of the driving current is independent of Vth and V02, and the threshold voltage can be compensated, and the driving current is made independent of the power supply voltage.

[0163] The present invention Figure 7 In at least one embodiment of the pixel circuit shown, when in operation, T5 and T2 are turned on in a time-sharing manner to prevent Vd from affecting the potential of N2 and improve circuit stability.

[0164] The pixel driving method described in at least one embodiment of the present invention is applied to the above-mentioned pixel circuit, wherein the display cycle includes a compensation phase and a writing phase which are arranged in sequence; the pixel driving method includes:

[0165] In the compensation stage, the data writing circuit writes the data voltage on the data line to the third node under the control of the first gate driving signal; the first initialization circuit writes the initialization voltage V0 to the first node under the control of the first gate driving signal; the energy storage circuit is charged by the data voltage so that the potential of the second node eventually becomes V0-Vth, where Vth is the threshold voltage of the driving transistor included in the driving circuit;

[0166] In the writing phase, the on-off control circuit controls the connection between the first node and the third node under the control of the first gate driving signal, so as to write the data voltage into the first node.

[0167] In the pixel driving method described in at least one embodiment of the present invention, the display cycle includes a compensation phase and a writing phase which are arranged in sequence. In the compensation phase, the potential of the second node can be finally changed to V0-Vth to complete the threshold voltage compensation, and in the writing phase, the data voltage is written into the first node to complete the data writing.

[0168] Optionally, the pixel circuit further includes a first light emitting control circuit; the display cycle further includes a light emitting phase arranged after the writing phase; and the pixel driving method further includes:

[0169] In the compensation stage, the driving circuit controls the connection between the first end of the driving circuit and the second end of the driving circuit under the control of the initialization voltage V0 connected to the control end thereof, charges the energy storage circuit through the data voltage, so as to change the potential of the second node, until the potential of the second node becomes V0-Vth, and the driving circuit disconnects the connection between the first end and the second end of the driving circuit;

[0170] In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, the on-off control circuit controls the connection between the first node and the third node under the control of the first gate drive signal, and the drive circuit controls the generation of a drive current that drives the light-emitting element to emit light under the control of the potential of its control terminal.

[0171] In a specific implementation, the pixel circuit may include a first light-emitting control circuit. In the compensation stage, the potential of the second node becomes V0-Vth. In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node, the on-off control circuit controls the connection between the first node and the third node, and the driving circuit drives the light-emitting element to emit light.

[0172] Optionally, the pixel circuit further includes a first light emitting control circuit and a second light emitting control circuit; the display cycle further includes a light emitting phase arranged after the writing phase; the compensation phase includes a first compensation time period and a second compensation time period; the pixel driving method further includes:

[0173] In the first compensation time period, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, so as to write the power supply voltage into the second node;

[0174] In the second compensation time period, the second light-emitting control circuit controls the second end of the driving circuit to be connected to the light-emitting element under the control of the second light-emitting control signal, and the driving circuit controls the first end of the driving circuit to be connected to the second end of the driving circuit under the control of the initialization voltage V0 connected to the control end thereof, and charges the energy storage circuit through the data voltage to change the potential of the second node until the potential of the second node becomes V0-Vth, and the driving circuit disconnects the first end thereof from the second end of the driving circuit;

[0175] In the writing stage, the second light emitting control circuit controls the second end of the driving circuit to be connected to the light emitting element under the control of the second light emitting control signal;

[0176] In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, and the second light-emitting control circuit controls the conduction between the second terminal of the driving circuit and the light-emitting element under the control of the second light-emitting control signal, so that the driving circuit can drive the light-emitting element to emit light.

[0177] In a specific implementation, the pixel circuit may include a first light-emitting control circuit and a second light-emitting control circuit. In a first compensation time period, the power supply voltage is written to the second node; in a second compensation time period, the potential of the second node becomes V0-Vth. In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node, and the second light-emitting control circuit controls the connection between the second terminal of the driving circuit and the light-emitting element, and the driving circuit drives the light-emitting element to emit light.

[0178] In a specific implementation, the pixel circuit may further include a second initialization circuit; and the pixel driving method may further include:

[0179] In the compensation stage, the second initialization circuit writes the initialization voltage into the first electrode of the light-emitting element under the control of the second gate driving signal to control the light-emitting element not to emit light.

[0180] A display panel according to at least one embodiment of the present invention includes the above-mentioned pixel circuit.

[0181] A display device according to at least one embodiment of the present invention includes the above-mentioned display panel.

[0182] The display device provided in at least one embodiment of the present invention may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, or the like.

[0183] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pixel circuit, characterized in that: It includes a light-emitting element, a driving circuit, a data writing circuit, an on-off control circuit, a first initialization circuit and an energy storage circuit; The control end of the driving circuit is electrically connected to the first node, the first end of the driving circuit is electrically connected to the second node, and the second end of the driving circuit is electrically connected to the light-emitting element; the driving circuit is used to generate a driving current for driving the light-emitting element to emit light under the control of the potential of the control end; The first end of the energy storage circuit is electrically connected to the second node, the second end of the energy storage circuit is electrically connected to the third node, and the energy storage circuit is used to store electrical energy; The data writing circuit is electrically connected to the first gate line, the data line and the third node respectively, and is used to write the data voltage on the data line into the third node under the control of the first gate driving signal provided by the first gate line; The on-off control circuit is electrically connected to the first gate line, the first node and the third node respectively, and is used to control the connection between the first node and the third node under the control of the first gate driving signal; The first initialization circuit is electrically connected to the first gate line, the first node and the initialization voltage terminal respectively, and is used to control the initialization voltage provided by the initialization voltage terminal to be written into the first node under the control of the first gate driving signal; The type of transistor included in the first initialization circuit is different from the type of driving transistor included in the driving circuit, and the type of transistor included in the data writing circuit is different from the type of driving transistor included in the driving circuit; The display cycle includes a compensation phase and a writing phase which are arranged in sequence; The data writing circuit is used to write the data voltage on the data line into the third node under the control of the first gate driving signal during the compensation phase; The first initialization circuit is used to write the initialization voltage V0 to the first node under the control of the first gate driving signal in the compensation stage, and charge the energy storage circuit through the data voltage so that the potential of the second node eventually becomes V0-Vth, wherein Vth is the threshold voltage of the driving transistor included in the driving circuit; The on-off control circuit is used to control the connection between the first node and the third node under the control of a first gate driving signal in a writing phase, so as to write the data voltage into the first node.

2. The pixel circuit according to claim 1, wherein: The driving transistor is a low-temperature polysilicon transistor, and the transistor included in the first initialization circuit and the transistor included in the data writing circuit are both oxide transistors.

3. The pixel circuit according to claim 1, wherein: The on-off control circuit includes a transistor of the same type as the driving transistor included in the driving circuit.

4. The pixel circuit according to any one of claims 1 to 3, characterized in that: It also includes a second initialization circuit; the second end of the driving circuit is electrically connected to the first pole of the light-emitting element, and the second pole of the light-emitting element is electrically connected to the first voltage end; The second initialization circuit is electrically connected to the second gate line, the initialization voltage terminal and the first electrode of the light-emitting element respectively, and is used to write the initialization voltage into the first electrode of the light-emitting element under the control of the second gate drive signal provided by the second gate line to control the light-emitting element not to emit light.

5. The pixel circuit according to claim 4, characterized in that: The second initialization circuit includes a transistor of the same type as the driving transistor.

6. The pixel circuit according to any one of claims 1 to 3, characterized in that: It also includes a first light-emitting control circuit; the first light-emitting control circuit is electrically connected to the second node, the power supply voltage terminal and the first light-emitting control line respectively, and is used to control the connection between the power supply voltage terminal and the second node under the control of a first light-emitting control signal provided by the first light-emitting control line.

7. The pixel circuit according to claim 6, characterized in that: It also includes a second light-emitting control circuit; the second end of the driving circuit is electrically connected to the light-emitting element through the second light-emitting control circuit; The second light-emitting control circuit is also electrically connected to a second light-emitting control line, and is used to control the connection between the second end of the driving circuit and the light-emitting element under the control of a second light-emitting control signal provided by the second light-emitting control line.

8. The pixel circuit according to any one of claims 1 to 3, characterized in that: The driving circuit includes a driving transistor, the data writing circuit includes a data writing transistor, the on-off control circuit includes an on-off control transistor, the first initialization circuit includes a first initialization transistor, and the energy storage circuit includes a storage capacitor; The control electrode of the driving transistor is electrically connected to the first node, the first electrode of the driving transistor is electrically connected to the second node, and the second electrode of the driving transistor is electrically connected to the light emitting element; The first end of the storage capacitor is electrically connected to the second node, and the second end of the storage capacitor is electrically connected to the third node; The control electrode of the data writing transistor is electrically connected to the first gate line, the first electrode of the data writing transistor is electrically connected to the data line, and the second electrode of the data writing transistor is electrically connected to the third node; The control electrode of the on-off control transistor is electrically connected to the first gate line, the first electrode of the on-off control transistor is electrically connected to the third node, and the second electrode of the on-off control transistor is electrically connected to the first node; A control electrode of the first initialization transistor is electrically connected to the first gate line, a first electrode of the first initialization transistor is electrically connected to the initialization voltage terminal, and a second electrode of the first initialization transistor is electrically connected to the first node.

9. The pixel circuit according to claim 4, characterized in that: The second initialization circuit includes a second initialization transistor; The control electrode of the second initialization transistor is electrically connected to the second gate line, the first electrode of the second initialization transistor is electrically connected to the initialization voltage terminal, and the second electrode of the second initialization transistor is electrically connected to the first electrode of the light emitting element; The second initialization transistor is a low temperature polysilicon transistor.

10. The pixel circuit according to claim 6, characterized in that: The first light emission control circuit includes a first light emission control transistor; The control electrode of the first light emission control transistor is electrically connected to the first light emission control line, the first electrode of the first light emission control transistor is electrically connected to the power supply voltage terminal, and the second electrode of the first light emission control transistor is electrically connected to the second node; The first light emission control transistor is a low temperature polysilicon transistor.

11. The pixel circuit according to claim 7, characterized in that: The second light emission control circuit includes a second light emission control transistor; The control electrode of the second light emitting control transistor is electrically connected to the second light emitting control line, the first electrode of the second light emitting control transistor is electrically connected to the second end of the driving circuit, and the second electrode of the second light emitting control transistor is electrically connected to the light emitting element; The second light emission control transistor is a low temperature polysilicon transistor.

12. A pixel driving method, applied to the pixel circuit according to any one of claims 1 to 11, wherein a display cycle comprises a compensation phase and a writing phase arranged in sequence; The pixel driving method comprises: In the compensation stage, the data writing circuit writes the data voltage on the data line to the third node under the control of the first gate driving signal; the first initialization circuit writes the initialization voltage V0 to the first node under the control of the first gate driving signal; the energy storage circuit is charged by the data voltage so that the potential of the second node eventually becomes V0-Vth, wherein Vth is the threshold voltage of the driving transistor included in the driving circuit; In the writing phase, the on-off control circuit controls the connection between the first node and the third node under the control of the first gate driving signal, so as to write the data voltage into the first node.

13. The pixel driving method according to claim 12, wherein: The pixel circuit further includes a first light-emitting control circuit; the display cycle further includes a light-emitting stage arranged after the writing stage; the pixel driving method further includes: in the compensation stage, the driving circuit controls the connection between the first end of the driving circuit and the second end of the driving circuit under the control of the initialization voltage V0 connected to the control end thereof, charges the energy storage circuit through the data voltage to change the potential of the second node, until the potential of the second node becomes V0-Vth, and the driving circuit disconnects the connection between the first end and the second end of the driving circuit; In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, the on-off control circuit controls the connection between the first node and the third node under the control of the first gate drive signal, and the drive circuit controls the generation of a drive current that drives the light-emitting element to emit light under the control of the potential of its control terminal.

14. The pixel driving method according to claim 12, wherein: The pixel circuit further includes a first light emitting control circuit and a second light emitting control circuit; the display cycle further includes a light emitting phase arranged after the writing phase; the compensation phase includes a first compensation time period and a second compensation time period; the pixel driving method further includes: In the first compensation time period, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, so as to write the power supply voltage into the second node; In the second compensation time period, the second light-emitting control circuit controls the second end of the driving circuit to be connected to the light-emitting element under the control of the second light-emitting control signal, and the driving circuit controls the first end of the driving circuit to be connected to the second end of the driving circuit under the control of the initialization voltage V0 connected to the control end thereof, and charges the energy storage circuit through the data voltage to change the potential of the second node until the potential of the second node becomes V0-Vth, and the driving circuit disconnects the first end thereof from the second end of the driving circuit; In the writing stage, the second light emitting control circuit controls the second end of the driving circuit to be connected to the light emitting element under the control of the second light emitting control signal; In the light-emitting stage, the first light-emitting control circuit controls the connection between the power supply voltage terminal and the second node under the control of the first light-emitting control signal, and the second light-emitting control circuit controls the conduction between the second terminal of the driving circuit and the light-emitting element under the control of the second light-emitting control signal, and the driving circuit drives the light-emitting element to emit light.

15. The pixel driving method according to claim 13 or 14, characterized in that: The pixel circuit further includes a second initialization circuit; and the pixel driving method further includes: In the compensation stage, the second initialization circuit writes the initialization voltage into the first electrode of the light-emitting element under the control of the second gate driving signal to control the light-emitting element not to emit light.

16. A display panel comprising the pixel circuit according to any one of claims 1 to 11.

17. A display device comprising the display panel according to claim 16.

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