Pixel circuit, driving method and display device

Abstract

A pixel circuit, a driving method and a display device. The pixel circuit comprises a first reset circuit (11) and a driving circuit (12); the first reset circuit (11) is electrically connected to a first light-emitting control line (E1), a reset control line (R1), a first reset voltage line (I1) and a first end of the driving circuit (12) respectively, and is used to control the first reset voltage provided by the first reset voltage line (I1) to be written into the first end of the driving circuit (12) under the control of a first light-emitting control signal provided by the first light-emitting control line (E1) and a reset control signal provided by the reset control line (R1); the driving circuit (12) is used to conduct the connection between the first end of the driving circuit (12) and the second end of the driving circuit (12) under the control of the potential of its control end. A new structure of a low-temperature polycrystalline oxide pixel circuit is provided.

Description

Technical Field

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

[0002] Existing LTPS (low temperature polycrystalline silicon) display panels utilize the high mobility characteristics of LTPS to be applied in display fields requiring high switching speeds; however, due to the transistor characteristics of LTPS TFT (thin film transistor), there is a leakage problem, and the display effect is not ideal in the low-frequency display field. Summary of the invention

[0003] The main purpose of the present invention is to provide a pixel circuit, a driving method and a display device, and to provide a new LTPO (low temperature polycrystalline oxide) pixel circuit structure.

[0004] In one aspect, an embodiment of the present invention provides a pixel circuit, including a first reset circuit and a driving circuit;

[0005] The first reset circuit is electrically connected to the first light-emitting control line, the reset control line, the first reset voltage line and the first end of the driving circuit respectively, and is used to control the first reset voltage provided by the first reset voltage line to be written into the first end of the driving circuit under the control of the first light-emitting control signal provided by the first light-emitting control line and the reset control signal provided by the reset control line;

[0006] The driving circuit is used to conduct the connection between the first end of the driving circuit and the second end of the driving circuit under the control of the potential of the control end thereof.

[0007] Optionally, the first reset circuit includes a first transistor and a second transistor;

[0008] The control electrode of the first transistor is electrically connected to the first light emitting control line, and the first electrode of the first transistor is electrically connected to the first end of the driving circuit;

[0009] The control electrode of the second transistor is electrically connected to the reset control line, the first electrode of the second transistor is electrically connected to the second electrode of the first transistor, and the second electrode of the second transistor is electrically connected to the first reset voltage line.

[0010] Optionally, the reset control line is a second light emitting control line, the first transistor is a p-type transistor, and the second transistor is an n-type transistor;

[0011] The pixel circuit includes a first light emitting control circuit and a second light emitting control circuit;

[0012] The first light-emitting control circuit is electrically connected to the first light-emitting control line, the first end of the driving circuit and the first pole of the light-emitting element respectively, and is used to control the first end of the driving circuit to be connected to the first pole of the light-emitting element under the control of the first light-emitting control signal;

[0013] The second light-emitting control circuit is electrically connected to the second light-emitting control line, the first voltage terminal and the second terminal of the driving circuit respectively, and is used to control the connection between the first voltage terminal and the second terminal of the driving circuit under the control of the second light-emitting control signal provided by the second light-emitting control line.

[0014] Optionally, the first reset circuit includes a first transistor and a second transistor;

[0015] The control electrode of the first transistor is electrically connected to the reset control line, and the first electrode of the first transistor is electrically connected to the first end of the driving circuit;

[0016] The control electrode of the second transistor is electrically connected to the first light emitting control line, the first electrode of the second transistor is electrically connected to the second electrode of the first transistor, and the second electrode of the second transistor is electrically connected to the first reset voltage line.

[0017] Optionally, the reset control line is a second light emitting control line, the first transistor is an n-type transistor, and the second transistor is a p-type transistor;

[0018] The pixel circuit includes a first light emitting control circuit and a second light emitting control circuit;

[0019] The first light-emitting control circuit is electrically connected to the first light-emitting control line, the first end of the driving circuit and the first pole of the light-emitting element respectively, and is used to control the first end of the driving circuit to be connected to the first pole of the light-emitting element under the control of the first light-emitting control signal;

[0020] The second light-emitting control circuit is electrically connected to the second light-emitting control line, the first voltage terminal and the second terminal of the driving circuit respectively, and is used to control the connection between the first voltage terminal and the second terminal of the driving circuit under the control of the second light-emitting control signal provided by the second light-emitting control line.

[0021] Optionally, the reset control line is a first scan line, and the first transistor and the second transistor are both p-type transistors;

[0022] The pixel circuit includes a first light emitting control circuit and a second light emitting control circuit;

[0023] The first light-emitting control circuit is electrically connected to the second light-emitting control line, the first end of the driving circuit and the first electrode of the light-emitting element respectively, and is used to control the first end of the driving circuit to be connected to the first electrode of the light-emitting element under the control of the second light-emitting control signal provided by the second light-emitting control line;

[0024] The second light-emitting control circuit is electrically connected to the first light-emitting control line, the first voltage terminal and the second terminal of the driving circuit respectively, and is used to control the connection between the first voltage terminal and the second terminal of the driving circuit under the control of the first light-emitting control signal.

[0025] Optionally, the pixel circuit described in at least one embodiment of the present invention further includes a second reset circuit;

[0026] The second reset circuit is electrically connected to the second light-emitting control line, the second reset voltage line and the first electrode of the light-emitting element respectively, and is used to write the second reset voltage provided by the second reset voltage line into the first electrode of the light-emitting element under the control of the second light-emitting control signal.

[0027] Optionally, the second reset circuit includes a third transistor;

[0028] The control electrode of the third transistor is electrically connected to the second light emitting control line, the first electrode of the third transistor is electrically connected to the second reset voltage line, and the second electrode of the third transistor is electrically connected to the first electrode of the light emitting element.

[0029] Optionally, the third transistor is an n-type transistor.

[0030] Optionally, the pixel circuit described in at least one embodiment of the present invention further includes a compensation control circuit, a data writing circuit and an energy storage circuit;

[0031] The compensation control circuit is electrically connected to the second scan line, the control end of the drive circuit and the first end of the drive circuit respectively, and is used to control the control end of the drive circuit to be connected to the first end of the drive circuit under the control of the second scan signal provided by the second scan line;

[0032] The data writing circuit is electrically connected to the third scan line, the data line and the second end of the driving circuit respectively, and is used to write the data voltage on the data line into the second end of the driving circuit under the control of the third scan signal provided by the third scan line;

[0033] The energy storage circuit is electrically connected to the control end of the drive circuit and is used for storing electric energy.

[0034] Optionally, the compensation control circuit includes a fourth transistor, the data writing circuit includes a fifth transistor, the driving circuit includes a driving transistor, and the energy storage circuit includes a storage capacitor;

[0035] The control electrode of the driving transistor is electrically connected to the control end of the driving circuit, the first electrode of the driving transistor is electrically connected to the first end of the driving circuit, and the second electrode of the driving transistor is electrically connected to the second end of the driving circuit;

[0036] The control electrode of the fourth transistor is electrically connected to the second scan line, the first electrode of the fourth transistor is electrically connected to the control electrode of the driving transistor, and the second electrode of the fourth transistor is electrically connected to the first electrode of the driving circuit;

[0037] The control electrode of the fifth transistor is electrically connected to the third scan line, the first electrode of the fifth transistor is electrically connected to the data line, and the second electrode of the fifth transistor is electrically connected to the second electrode of the driving transistor;

[0038] The first end of the storage capacitor is electrically connected to the control electrode of the driving transistor, and the second end of the storage capacitor is electrically connected to the first voltage end.

[0039] Optionally, the first light emitting control circuit includes a sixth transistor, and the second light emitting control circuit includes a seventh transistor;

[0040] The control electrode of the sixth transistor is electrically connected to the first light-emitting control line, the first electrode of the sixth transistor is electrically connected to the first end of the driving circuit, and the second electrode of the sixth transistor is electrically connected to the first electrode of the light-emitting element;

[0041] The control electrode of the seventh transistor is electrically connected to the second light emitting control line, the first electrode of the seventh transistor is electrically connected to the first voltage terminal, and the second electrode of the seventh transistor is electrically connected to the second terminal of the driving circuit;

[0042] The second electrode of the light emitting element is electrically connected to the second voltage terminal.

[0043] Optionally, the first light emitting control circuit includes a sixth transistor, and the second light emitting control circuit includes a seventh transistor;

[0044] The control electrode of the sixth transistor is electrically connected to the second light emitting control line, the first electrode of the sixth transistor is electrically connected to the first end of the driving circuit, and the second electrode of the sixth transistor is electrically connected to the first electrode of the light emitting element;

[0045] The control electrode of the seventh transistor is electrically connected to the first light-emitting control line, the first electrode of the seventh transistor is electrically connected to the first voltage terminal, and the second electrode of the seventh transistor is electrically connected to the second terminal of the driving circuit;

[0046] The second electrode of the light emitting element is electrically connected to the second voltage terminal.

[0047] In the second aspect, an embodiment of the present invention also provides a driving method, which is applied to the above-mentioned pixel circuit, and the driving method includes: in the refresh reset stage and the hold reset stage, the first reset circuit controls the first reset voltage provided by the first reset voltage line to be written into the first end of the driving circuit under the control of the first light-emitting control signal provided by the first light-emitting control line and the reset control signal provided by the reset control line.

[0048] Optionally, the pixel circuit further includes a compensation control circuit;

[0049] The driving method also includes: in the refresh reset stage, the compensation control circuit controls the connection between the first end of the driving circuit and the control end of the driving circuit under the control of the second scan signal provided by the second scan line, so as to write the first reset voltage into the control end of the driving circuit.

[0050] Optionally, the pixel circuit further includes a light-emitting element, a compensation control circuit, a data writing circuit, an energy storage circuit, a first light-emitting control circuit and a second light-emitting control circuit; the refresh display cycle further includes a refresh charging phase and a refresh light-emitting phase arranged after the refresh reset phase; the driving method further includes:

[0051] In the refresh charging stage, the data writing circuit writes the data voltage on the data line to the second end of the driving circuit under the control of the third scanning signal provided by the third scanning line, and the compensation control circuit controls the first end of the driving circuit to be connected with the control end of the driving circuit under the control of the second scanning signal, so as to charge the energy storage circuit through the data voltage;

[0052] In the refresh light-emitting stage, the first light-emitting control circuit controls the connection between the first end of the driving circuit and the first pole of the light-emitting element, and the second light-emitting control circuit controls the connection between the first voltage end and the second end of the driving circuit, and the driving circuit drives the light-emitting element to emit light.

[0053] Optionally, the pixel circuit further includes a first light emitting control circuit and a light emitting element; the reset control line is a second light emitting control line; the first light emitting control circuit is electrically connected to the first light emitting control line; and the driving method further includes:

[0054] In the refresh reset stage and the hold reset stage, the first light emitting control circuit, under the control of the first light emitting control signal, controls the connection between the first end of the driving circuit and the first pole of the light emitting element to control the writing of the first reset voltage into the first pole of the light emitting element.

[0055] Optionally, the pixel circuit further includes a first light emitting control circuit, a second reset circuit and a light emitting element; the first light emitting control circuit is electrically connected to the second light emitting control line; and the driving method further includes:

[0056] In the refresh reset stage and the hold reset stage, the first light-emitting control circuit, under the control of the second light-emitting control signal, controls the disconnection between the first end of the driving circuit and the first pole of the light-emitting element, and the second reset circuit, under the control of the second light-emitting control signal, writes the second reset voltage into the first pole of the light-emitting element.

[0057] Optionally, the display maintenance period further includes a light maintenance phase arranged after the reset maintenance phase; and the driving method further includes:

[0058] In the light-maintaining stage, the first light-emitting control circuit controls the connection between the first end of the driving circuit and the first pole of the light-emitting element, and the second light-emitting control circuit controls the connection between the first voltage end and the second end of the driving circuit, and the driving circuit drives the light-emitting element to emit light.

[0059] Optionally, the driving method described in at least one embodiment of the present invention further includes:

[0060] Detect the display brightness range of the display panel, and when the maximum brightness corresponding to the display brightness range is less than or equal to a predetermined brightness, control to increase the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal provided by the second light-emitting control line so that the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal are greater than a predetermined frequency.

[0061] Optionally, the driving method described in at least one embodiment of the present invention further includes:

[0062] The display brightness range of the display panel is detected, and when the maximum brightness corresponding to the display brightness range is less than or equal to the predetermined brightness, the frequency of the second light-emitting control signal provided by the second light-emitting control line is controlled to be increased so that the frequency of the second light-emitting control signal is greater than the predetermined frequency.

[0063] In a third aspect, an embodiment of the present invention provides a display device, comprising the above-mentioned pixel circuit.

[0064] The pixel circuit, driving method and display device described in the embodiments of the present invention write a first reset voltage into the first end of the driving circuit through a first reset circuit under the control of a first light-emitting control signal and a reset control signal. Through the cooperation of the compensation control circuit, the first reset voltage can be written into the control end of the driving circuit in the refresh reset stage and the hold reset stage, so as to provide a new LTPO (low-temperature polycrystalline oxide) pixel circuit structure and realize the reset of key nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 is a structural diagram of a pixel circuit according to an embodiment of the present invention;

[0066] Figure 2 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0067] Figure 3 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0068] Figure 4 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0069] Figure 5 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0070] Figure 6 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0071] Figure 7 A structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0072] Figure 8 is a structural diagram of a pixel circuit according to at least one embodiment of the present invention;

[0073] Fig. 9 is a circuit diagram of a pixel circuit according to at least one embodiment of the present invention;

[0074] Fig.10 is a working timing diagram of a pixel circuit according to at least one embodiment of the present invention;

[0075] Fig.11 is a circuit diagram of a pixel circuit according to at least one embodiment of the present invention;

[0076] Fig.12 yes Fig.11 An operation timing diagram of at least one embodiment of the pixel circuit shown;

[0077] Fig.13 yes Fig.11 Another operation timing diagram of at least one embodiment of the pixel circuit is shown. DETAILED DESCRIPTION

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] like Figure 1 As shown, the pixel circuit described in the embodiment of the present invention includes a first reset circuit 11 and a driving circuit 12;

[0083] The first reset circuit 11 is electrically connected to the first light-emitting control line E1, the reset control line R1, the first reset voltage line I1 and the first end of the driving circuit 12 respectively, and is used to control the first reset voltage Vi1 provided by the first reset voltage line I1 to be written into the first end of the driving circuit 12 under the control of the first light-emitting control signal provided by the first light-emitting control line E1 and the reset control signal provided by the reset control line R1;

[0084] The driving circuit 12 is used to conduct the connection between the first end of the driving circuit 12 and the second end of the driving circuit 12 under the control of the potential of the control end thereof.

[0085] The pixel circuit described in the embodiment of the present invention writes the first reset voltage Vi1 into the first end of the driving circuit 12 through the first reset circuit 11 under the control of the first light-emitting control signal and the reset control signal. Through the cooperation of the compensation control circuit, the first reset voltage Vi1 can be written into the control end of the driving circuit 12 in the refresh reset stage and the hold reset stage, so as to provide a new pixel circuit structure and realize the reset of key nodes.

[0086] The present invention Figure 1 When the embodiment of the pixel circuit shown is in operation, the refresh display cycle may include a refresh reset phase, and the hold display cycle may include a hold reset phase. During the refresh reset phase and the hold reset phase, the first reset circuit 11 writes Vi1 to the first end of the driving circuit 12 under the control of the first light emitting control signal and the reset control signal.

[0087] In at least one embodiment of the present invention, the first reset circuit may include a first transistor and a second transistor;

[0088] The control electrode of the first transistor is electrically connected to the first light emitting control line, and the first electrode of the first transistor is electrically connected to the first end of the driving circuit;

[0089] The control electrode of the second transistor is electrically connected to the reset control line, the first electrode of the second transistor is electrically connected to the second electrode of the first transistor, and the second electrode of the second transistor is electrically connected to the first reset voltage line.

[0090] Optionally, the reset control line is a second light emitting control line, the first transistor is a p-type transistor, and the second transistor is an n-type transistor;

[0091] The pixel circuit includes a first light emitting control circuit and a second light emitting control circuit;

[0092] The first light-emitting control circuit is electrically connected to the first light-emitting control line, the first end of the driving circuit and the first pole of the light-emitting element respectively, and is used to control the first end of the driving circuit to be connected to the first pole of the light-emitting element under the control of the first light-emitting control signal;

[0093] The second light-emitting control circuit is electrically connected to the second light-emitting control line, the first voltage terminal and the second terminal of the driving circuit respectively, and is used to control the connection between the first voltage terminal and the second terminal of the driving circuit under the control of the second light-emitting control signal provided by the second light-emitting control line.

[0094] like Figure 2 As shown, in Figure 1Based on the embodiment of the pixel circuit, the reset control line is a second light emitting control line E2; the pixel circuit according to at least one embodiment of the present invention further includes a first light emitting control circuit 21 and a second light emitting control circuit 22;

[0095] The first reset circuit 11 includes a first transistor T1 and a second transistor T2;

[0096] The gate of the first transistor T1 is electrically connected to the first light emitting control line E1, and the source of the first transistor T1 is electrically connected to the first end of the driving circuit 12;

[0097] The gate of the second transistor T2 is electrically connected to the second light emitting control line E2, the source of the second transistor T2 is electrically connected to the drain of the first transistor T1, and the drain of the second transistor T2 is electrically connected to the first reset voltage line I1;

[0098] The first light emitting control circuit 21 is electrically connected to the first light emitting control line E1, the first end of the driving circuit 12 and the first pole of the light emitting element 10 respectively, and is used to control the first end of the driving circuit 12 to be connected to the first pole of the light emitting element 10 under the control of the first light emitting control signal;

[0099] The second light emitting control circuit 21 is electrically connected to the second light emitting control line E2, the first voltage terminal V1 and the second terminal of the driving circuit 12 respectively, and is used to control the first voltage terminal V1 to be connected to the second terminal of the driving circuit 12 under the control of the second light emitting control signal provided by the second light emitting control line E2;

[0100] T1 is a p-type transistor and T2 is an n-type transistor.

[0101] The present invention Figure 2 When at least one embodiment of the pixel circuit shown is in operation, in the refresh reset stage and the hold reset stage, the potential of the first light-emitting control signal is a low voltage, the potential of the second light-emitting control signal is a high voltage, E1 provides a low voltage signal, E2 provides a high voltage signal, T1 and T2 are turned on, and the first light-emitting control circuit 21, under the control of the first light-emitting control signal, controls the first end of the driving circuit 12 to be connected to the first pole of the light-emitting element 10, so as to provide the first reset voltage Vi1 provided by the first reset voltage line I1 to the first pole of the light-emitting element 10, thereby clearing the residual charge at the first pole of the light-emitting element 10.

[0102] In the present invention, Figure 2 In at least one embodiment of the pixel circuit shown, T1 may be a low-temperature polysilicon thin film transistor, and T2 may be an IGZO (indium gallium zinc oxide) thin film transistor.

[0103] In at least one embodiment of the present invention, the first reset circuit may include a first transistor and a second transistor;

[0104] The control electrode of the first transistor is electrically connected to the reset control line, and the first electrode of the first transistor is electrically connected to the first end of the driving circuit;

[0105] The control electrode of the second transistor is electrically connected to the first light emitting control line, the first electrode of the second transistor is electrically connected to the second electrode of the first transistor, and the second electrode of the second transistor is electrically connected to the first reset voltage line.

[0106] Optionally, the reset control line is a second light emitting control line, the first transistor is an n-type transistor, and the second transistor is a p-type transistor;

[0107] The pixel circuit includes a first light emitting control circuit and a second light emitting control circuit;

[0108] The first light-emitting control circuit is electrically connected to the first light-emitting control line, the first end of the driving circuit and the first pole of the light-emitting element respectively, and is used to control the first end of the driving circuit to be connected to the first pole of the light-emitting element under the control of the first light-emitting control signal;

[0109] The second light-emitting control circuit is electrically connected to the second light-emitting control line, the first voltage terminal and the second terminal of the driving circuit respectively, and is used to control the connection between the first voltage terminal and the second terminal of the driving circuit under the control of the second light-emitting control signal provided by the second light-emitting control line.

[0110] like Figure 3 As shown, in Figure 1 Based on the embodiment of the pixel circuit, the reset control line is a second light emitting control line E2; the pixel circuit according to at least one embodiment of the present invention further includes a first light emitting control circuit 21 and a second light emitting control circuit 22;

[0111] The first reset circuit 11 includes a first transistor T1 and a second transistor T2;

[0112] The gate of the first transistor T1 is electrically connected to the second light emitting control line E2, and the source of the first transistor T1 is electrically connected to the first end of the driving circuit 12;

[0113] The gate of the second transistor T2 is electrically connected to the first light emitting control line E1, the source of the second transistor T2 is electrically connected to the drain of the first transistor T1, and the drain of the second transistor T2 is electrically connected to the first reset voltage line I1;

[0114] The first light-emitting control circuit 21 is electrically connected to the first light-emitting control line E1, the first end of the driving circuit 12, and the first pole of the light-emitting element 10 respectively, and is configured to control the connection between the first end of the driving circuit 12 and the first pole of the light-emitting element 10 under the control of a first light-emitting control signal;

[0115] The second light-emitting control circuit 21 is electrically connected to the second light-emitting control line E2, the first voltage terminal V1, and the second end of the driving circuit 12 respectively, and is configured to control the connection between the first voltage terminal V1 and the second end of the driving circuit 12 under the control of a second light-emitting control signal provided by the second light-emitting control line E2;

[0116] T1 is an n-type transistor, and T2 is a p-type transistor.

[0117] In at least one embodiment of the pixel circuit as Figure 3 shown in the present invention, during the refresh reset stage and the hold reset stage, the potential of the first light-emitting control signal is a low voltage, the potential of the second light-emitting control signal is a high voltage, E1 provides a low voltage signal, E2 provides a high voltage signal, T1 and T2 are turned on, and the first light-emitting control circuit 21 controls the connection between the first end of the driving circuit 12 and the first pole of the light-emitting element 10 under the control of the first light-emitting control signal, so as to provide the first reset voltage Vi1 provided by the first reset voltage line I1 to the first pole of the light-emitting element 10 to clear the charge remaining on the first pole of the light-emitting element 10.

[0118] In at least one embodiment of the pixel circuit as Figure 3 shown in the present invention, T2 can be a low-temperature polysilicon thin-film transistor, and T1 can be an IGZO (indium gallium zinc oxide) thin-film transistor.

[0119] Optionally, the first light-emitting control circuit includes a sixth transistor, and the second light-emitting control circuit includes a seventh transistor;

[0120] The control electrode of the sixth transistor is electrically connected to the first light-emitting control line, the first pole of the sixth transistor is electrically connected to the first end of the driving circuit, and the second pole of the sixth transistor is electrically connected to the first pole of the light-emitting element;

[0121] The control electrode of the seventh transistor is electrically connected to the second light-emitting control line, the first pole of the seventh transistor is electrically connected to the first voltage terminal, and the second pole of the seventh transistor is electrically connected to the second end of the driving circuit;

[0122] The second pole of the light-emitting element is electrically connected to a second voltage terminal.

[0123] Optionally, the reset control line is a first scan line, and the first transistor and the second transistor are both p-type transistors;

[0124] The pixel circuit includes a first light emitting control circuit and a second light emitting control circuit;

[0125] The first light-emitting control circuit is electrically connected to the second light-emitting control line, the first end of the driving circuit and the first electrode of the light-emitting element respectively, and is used to control the first end of the driving circuit to be connected to the first electrode of the light-emitting element under the control of the second light-emitting control signal provided by the second light-emitting control line;

[0126] The second light-emitting control circuit is electrically connected to the first light-emitting control line, the first voltage terminal and the second terminal of the driving circuit respectively, and is used to control the connection between the first voltage terminal and the second terminal of the driving circuit under the control of the first light-emitting control signal.

[0127] like Figure 4 As shown, in Figure 1 Based on the embodiment of the pixel circuit, the reset control line is a first scan line S1; the pixel circuit according to at least one embodiment of the present invention further includes a first light emitting control circuit 21 and a second light emitting control circuit 22;

[0128] The first reset circuit 11 includes a first transistor T1 and a second transistor T2;

[0129] The gate of the first transistor T1 is electrically connected to the first light emitting control line E1, and the source of the first transistor T1 is electrically connected to the first end of the driving circuit 12;

[0130] The gate of the second transistor T2 is electrically connected to the first scan line S1, the source of the second transistor T2 is electrically connected to the drain of the first transistor T1, and the drain of the second transistor T2 is electrically connected to the first reset voltage line I1;

[0131] The first light-emitting control circuit 21 is electrically connected to the second light-emitting control line E2, the first end of the driving circuit 12 and the first electrode of the light-emitting element 10 respectively, and is used to control the first end of the driving circuit 12 to be connected to the first electrode of the light-emitting element 10 under the control of the second light-emitting control signal provided by the second light-emitting control line E2;

[0132] The second light emitting control circuit 22 is electrically connected to the first light emitting control line E1, the first voltage terminal V1 and the second terminal of the driving circuit 12 respectively, and is used to control the first voltage terminal V1 to be connected to the second terminal of the driving circuit 12 under the control of the second light emitting control signal provided by the first light emitting control line E1;

[0133] T1 is a p-type transistor, and T2 is a p-type transistor.

[0134] In the present invention, Figure 4 In at least one embodiment of the pixel circuit shown, T1 and T2 may be low temperature polysilicon thin film transistors.

[0135] The present invention Figure 4 When at least one embodiment of the pixel circuit shown is in operation, in the refresh reset stage and the hold reset stage, the potential of the first light-emitting control signal provided by E1 is a low voltage, the potential of the first scanning signal provided by S1 is a low voltage, and T1 and T2 are turned on to write the first reset voltage Vi1 provided by the first reset voltage line into the first end of the driving circuit 12.

[0136] like Figure 5 As shown, in Figure 1 Based on the embodiment of the pixel circuit, the reset control line is a first scan line S1; the pixel circuit according to at least one embodiment of the present invention further includes a first light emitting control circuit 21 and a second light emitting control circuit 22;

[0137] The first reset circuit 11 includes a first transistor T1 and a second transistor T2;

[0138] The gate of the first transistor T1 is electrically connected to the first scan line S1, and the source of the first transistor T1 is electrically connected to the first end of the driving circuit 12;

[0139] The gate of the second transistor T2 is electrically connected to the first light emitting control line E1, the source of the second transistor T2 is electrically connected to the drain of the first transistor T1, and the drain of the second transistor T2 is electrically connected to the first reset voltage line I1;

[0140] The first light-emitting control circuit 21 is electrically connected to the second light-emitting control line E2, the first end of the driving circuit 12 and the first electrode of the light-emitting element 10 respectively, and is used to control the first end of the driving circuit 12 to be connected to the first electrode of the light-emitting element 10 under the control of the second light-emitting control signal provided by the second light-emitting control line E2;

[0141] The second light emitting control circuit 22 is electrically connected to the first light emitting control line E1, the first voltage terminal V1 and the second terminal of the driving circuit 12 respectively, and is used to control the first voltage terminal V1 to be connected to the second terminal of the driving circuit 12 under the control of the second light emitting control signal provided by the first light emitting control line E1;

[0142] T1 is a p-type transistor, and T2 is a p-type transistor.

[0143] In the present invention, Figure 5In at least one embodiment of the pixel circuit shown, T1 and T2 may be low temperature polysilicon thin film transistors.

[0144] The present invention Figure 5 When at least one embodiment of the pixel circuit shown is in operation, in the refresh reset stage and the hold reset stage, the potential of the first light-emitting control signal provided by E1 is a low voltage, the potential of the first scanning signal provided by S1 is a low voltage, and T1 and T2 are turned on to write the first reset voltage Vi1 provided by the first reset voltage line into the first end of the driving circuit 12.

[0145] Optionally, the first light emitting control circuit includes a sixth transistor, and the second light emitting control circuit includes a seventh transistor;

[0146] The control electrode of the sixth transistor is electrically connected to the second light emitting control line, the first electrode of the sixth transistor is electrically connected to the first end of the driving circuit, and the second electrode of the sixth transistor is electrically connected to the first electrode of the light emitting element;

[0147] The control electrode of the seventh transistor is electrically connected to the first light-emitting control line, the first electrode of the seventh transistor is electrically connected to the first voltage terminal, and the second electrode of the seventh transistor is electrically connected to the second terminal of the driving circuit;

[0148] The second electrode of the light emitting element is electrically connected to the second voltage terminal.

[0149] like Figure 6 As shown, in Figure 4 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 reset circuit 40;

[0150] The second reset circuit 40 is electrically connected to the second light-emitting control line E2, the second reset voltage line I2 and the first pole of the light-emitting element 10, respectively, and is used to write the second reset voltage Vi2 provided by the second reset voltage line I2 into the first pole of the light-emitting element 10 under the control of the second light-emitting control signal provided by the second light-emitting control line E2.

[0151] The present invention Figure 6 When at least one embodiment of the pixel circuit shown is in operation, in the refresh reset stage, the refresh charging stage and the hold reset stage, the second reset circuit 40, under the control of the second light-emitting control signal, writes Vi2 to the first electrode of the light-emitting element 10 to clear the residual charge in the first electrode of the light-emitting element 10.

[0152] Optionally, the second reset circuit includes a third transistor;

[0153] The control electrode of the third transistor is electrically connected to the second light emitting control line, the first electrode of the third transistor is electrically connected to the second reset voltage line, and the second electrode of the third transistor is electrically connected to the first electrode of the light emitting element.

[0154] In at least one embodiment of the present invention, the third transistor is an n-type transistor, and the third transistor may be an IGZO thin film transistor.

[0155] The pixel circuit described in at least one embodiment of the present invention may further include a compensation control circuit, a data writing circuit and an energy storage circuit;

[0156] The compensation control circuit is electrically connected to the second scan line, the control end of the drive circuit and the first end of the drive circuit respectively, and is used to control the control end of the drive circuit to be connected to the first end of the drive circuit under the control of the second scan signal provided by the second scan line;

[0157] The data writing circuit is electrically connected to the third scan line, the data line and the second end of the driving circuit respectively, and is used to write the data voltage on the data line into the second end of the driving circuit under the control of the third scan signal provided by the third scan line;

[0158] The energy storage circuit is electrically connected to the control end of the drive circuit and is used for storing electric energy.

[0159] like Figure 7 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 may further include a compensation control circuit 51, a data writing circuit 52 and an energy storage circuit 53;

[0160] The compensation control circuit 51 is electrically connected to the second scan line S2, the control end of the drive circuit 12 and the first end of the drive circuit 12 respectively, and is used to control the control end of the drive circuit 12 to be connected to the first end of the drive circuit 12 under the control of the second scan signal provided by the second scan line S2;

[0161] The data writing circuit 52 is electrically connected to the third scan line S3, the data line D0 and the second end of the driving circuit 12 respectively, and is used to write the data voltage on the data line D0 into the second end of the driving circuit 12 under the control of the third scan signal provided by the third scan line S3;

[0162] The energy storage circuit 53 is electrically connected to the control end of the driving circuit and is used for storing electric energy.

[0163] The present invention Figure 7When at least one embodiment of the pixel circuit shown is in operation, in the refresh reset phase, the compensation control circuit 51 controls the control end of the driving circuit 12 to be connected to the first end of the driving circuit 12 under the control of the second scanning signal, so as to write the first reset voltage Vi into the control end of the driving circuit 12, so that at the beginning of the refresh charging phase, the driving circuit 12 can, under the control of the potential of its control end, conduct the connection between its first end and its second end;

[0164] In the refresh charging stage, the data writing circuit 52 writes the data voltage to the second end of the driving circuit 12 under the control of the third scanning signal, so as to charge the energy storage circuit 53 through the data voltage and increase the potential of the control end of the driving circuit 12 until the driving circuit 12 disconnects the connection between its first end and the second end under the control of the potential of its control end.

[0165] like Figure 8 As shown, in Figure 6 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 compensation control circuit 51, a data writing circuit 52 and an energy storage circuit 53;

[0166] The compensation control circuit 51 is electrically connected to the second scan line S2, the control end of the drive circuit 12 and the first end of the drive circuit 12 respectively, and is used to control the control end of the drive circuit 12 to be connected to the first end of the drive circuit 12 under the control of the second scan signal provided by the second scan line S2;

[0167] The data writing circuit 52 is electrically connected to the third scan line S3, the data line D0 and the second end of the driving circuit 12 respectively, and is used to write the data voltage on the data line D0 into the second end of the driving circuit 12 under the control of the third scan signal provided by the third scan line S3;

[0168] The energy storage circuit 53 is electrically connected to the control end of the driving circuit and is used for storing electric energy.

[0169] The present invention Figure 8 When at least one embodiment of the pixel circuit shown is in operation, in the refresh reset phase, the compensation control circuit 51 controls the control end of the driving circuit 12 to be connected to the first end of the driving circuit 12 under the control of the second scanning signal, so as to write the first reset voltage Vi into the control end of the driving circuit 12, so that at the beginning of the refresh charging phase, the driving circuit 12 can, under the control of the potential of its control end, conduct the connection between its first end and its second end;

[0170] In the refresh charging stage, the data writing circuit 52 writes the data voltage to the second end of the driving circuit 12 under the control of the third scanning signal, so as to charge the energy storage circuit 53 through the data voltage and increase the potential of the control end of the driving circuit 12 until the driving circuit 12 disconnects the connection between its first end and the second end under the control of the potential of its control end.

[0171] Optionally, the compensation control circuit includes a fourth transistor, the data writing circuit includes a fifth transistor, the driving circuit includes a driving transistor, and the energy storage circuit includes a storage capacitor;

[0172] The control electrode of the driving transistor is electrically connected to the control end of the driving circuit, the first electrode of the driving transistor is electrically connected to the first end of the driving circuit, and the second electrode of the driving transistor is electrically connected to the second end of the driving circuit;

[0173] The control electrode of the fourth transistor is electrically connected to the second scan line, the first electrode of the fourth transistor is electrically connected to the control electrode of the driving transistor, and the second electrode of the fourth transistor is electrically connected to the first electrode of the driving circuit;

[0174] The control electrode of the fifth transistor is electrically connected to the third scan line, the first electrode of the fifth transistor is electrically connected to the data line, and the second electrode of the fifth transistor is electrically connected to the second electrode of the driving transistor;

[0175] The first end of the storage capacitor is electrically connected to the control electrode of the driving transistor, and the second end of the storage capacitor is electrically connected to the first voltage end.

[0176] Optionally, the fourth transistor may be an n-type transistor, and the fifth transistor and the driving transistor may be p-type transistors; the fourth transistor may be an IGZO thin film transistor, and the fifth transistor and the driving transistor may be low-temperature polysilicon thin film transistors.

[0177] like Fig. 9 As shown, in Figure 7 On the basis of at least one embodiment of the pixel circuit shown, the light emitting element is an organic light emitting diode O1; the compensation control circuit 51 includes a fourth transistor T4, the data writing circuit 52 includes a fifth transistor T5, the driving circuit 12 includes a driving transistor T0, and the energy storage circuit 53 includes a storage capacitor C1;

[0178] The gate of the driving transistor T0 is electrically connected to the control terminal of the driving circuit 12, the drain of the driving transistor T0 is electrically connected to the first terminal of the driving circuit 12, and the source of the driving transistor T0 is electrically connected to the second terminal of the driving circuit 12;

[0179] The gate of the fourth transistor T4 is electrically connected to the second scan line S2, the source of the fourth transistor T4 is electrically connected to the gate of the driving transistor T0, and the drain of the fourth transistor T4 is electrically connected to the drain of the driving transistor;

[0180] The gate of the fifth transistor T5 is electrically connected to the third scan line S3, the source of the fifth transistor T5 is electrically connected to the data line D0, and the drain of the fifth transistor T5 is electrically connected to the source of the driving transistor T0;

[0181] The first end of the storage capacitor C1 is electrically connected to the gate of the driving transistor T0, and the second end of the storage capacitor C1 is electrically connected to the high voltage end; the high voltage end is used to provide a high voltage signal VDD;

[0182] The first light emitting control circuit includes a sixth transistor T6, and the second light emitting control circuit 22 includes a seventh transistor T7;

[0183] The gate of the sixth transistor T6 is electrically connected to the first light emitting control line E1, the source of the sixth transistor T6 is electrically connected to the drain of the driving transistor T0, and the drain of the sixth transistor T6 is electrically connected to the anode of O1;

[0184] The gate of the seventh transistor T7 is electrically connected to the second light emitting control line E2, the source of the seventh transistor T7 is electrically connected to the high voltage terminal, and the drain of the seventh transistor T7 is electrically connected to the source of the driving transistor T0;

[0185] The cathode of O1 is electrically connected to a low voltage terminal; the low voltage terminal is used to provide a low voltage signal VSS.

[0186] exist Fig. 9 In at least one embodiment of the pixel circuit shown, the first voltage terminal is a high voltage terminal, and the second voltage terminal is a low voltage terminal; T1, T0, T5, T6 and T7 are p-type transistors, and T2 and T4 are n-type transistors; T1, T0, T5, T6 and T7 are low-temperature polycrystalline silicon thin film transistors, and T2 and T4 are IGZO (indium gallium zinc oxide) thin film transistors.

[0187] like Fig.10 As shown, the present invention is Fig. 9 When at least one embodiment of the pixel circuit shown is in operation, a refresh display cycle includes a refresh reset phase t1, a refresh charging phase t2, and a refresh light emitting phase t3;

[0188] In the refresh reset stage t1, the potential of the first light emission control signal provided by E1 is a low voltage, the potential of the second light emission control signal provided by E2 is a high voltage, the potential of the second scan signal provided by S2 is a high voltage, the potential of the third scan signal provided by S3 is a high voltage, T1 is turned on, T2 is turned on, T4 is turned on, so as to write the first reset voltage Vi1 provided by I1 to the gate of T0, such that T0 can be turned on at the start of the refresh charge stage t2; T6 is turned on, so as to write Vi1 to the anode of O1, clearing the charge remaining on the anode of O1; T7 is turned off, T5 is turned off;

[0189] In the refresh charge stage t2, the potential of the first light emission control signal provided by E1 is a high voltage, the potential of the second light emission control signal provided by E2 is a high voltage, the potential of the second scan signal provided by S2 is a high voltage, the potential of the third scan signal provided by S3 is a low voltage, T1 is turned off, T2 is turned on, T4 is turned on, T5 is turned on; T6 is turned off, T7 is turned off;

[0190] At the start of the refresh charge stage t2, T0 is turned on, and the data voltage Vd on the data line D0 charges C1 through T5, T0, and T4, so as to raise the potential of the gate of T0 until the potential of T0 rises to Vd + Vth, where Vth is the threshold voltage of T0, and T0 is turned off, stopping the charging;

[0191] In the refresh light emission stage t3, the potential of the first light emission control signal provided by E1 is a low voltage, the potential of the second light emission control signal provided by E2 is a low voltage, the potential of the second scan signal provided by S2 is a low voltage, the potential of the third scan signal provided by S3 is a high voltage, T4 is turned off, T5 is turned off, T1 is turned on, T2 is turned off, T6 and T7 are turned on, T0 drives O1 to emit light, and the light emission current I of O1 is equal to K(Vdd - Vd)2; K is the current coefficient of T0, and Vdd is the voltage value of VDD.

[0192] As Fig.10 shown, the frequency of the first light emission control signal can be the same as the frequency of the second light emission control signal, the duty cycle of the first light emission control signal and the duty cycle of the second light emission control signal can be the same, the first light emission control signal is delayed by a period of time compared to the second light emission control signal, and the first light emission control signal and the second light emission control signal can be adjacent two - stage light emission control signals output by a light emission control signal generation circuit;

[0193] The first scan signal provided by S1 and the third scan signal provided by S3 can be scan signals with active - low levels, and the second scan signal provided by S2 can be a scan signal with an active - high level.

[0194] In the working process of at least one embodiment of the pixel circuit of the present invention as Fig. 9 shown, the holding display period includes a holding reset stage and a holding light emission stage;

[0195] In the hold reset stage, the potential of the first light-emitting control signal provided by E1 is a low voltage, the potential of the second light-emitting control signal provided by E2 is a high voltage, the potential of the second scanning signal provided by S2 is a high voltage, the potential of the third scanning signal provided by S3 is a high voltage, T1 is turned on, T2 is turned on, and T6 is turned on to write Vi1 into the anode of O1 and clear the residual charge of the anode of O1; T7 is turned off, and T5 is turned off;

[0196] In the stage of maintaining light emission, the potential of the first light emission control signal provided by E1 is a low voltage, the potential of the second light emission control signal provided by E2 is a low voltage, the potential of the second scanning signal provided by S2 is a low voltage, the potential of the third scanning signal provided by S3 is a high voltage, T4 is turned off, T5 is turned off, T1 is turned on, T2 is turned off, T6 and T7 are turned on, T0 drives O1 to emit light, and the light emission current I of O1 is equal to K(Vdd-Vd)2; K is the current coefficient of T0, Vdd is the voltage value of VDD; wherein Vd is the data voltage provided by the data line D0 in the adjacent previous refresh charging stage.

[0197] The present invention Fig. 9 When at least one embodiment of the pixel circuit shown is in operation, during the display maintenance cycle, there is no process of charging the energy storage circuit 23, and during the light maintenance stage, the driving current of the light-emitting element 11 driven by the driving circuit 11 is still related to the data voltage in the refresh charging stage in the last refresh display cycle.

[0198] The present invention Fig. 9 When at least one embodiment of the pixel circuit shown is in operation, when the display panel to which the pixel circuit is applied is displayed at low brightness, that is, when the maximum brightness corresponding to the display brightness range of the display panel is less than or equal to a predetermined brightness, the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal can be increased so that the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal are greater than the predetermined frequency, so as to increase the frequency of setting the potential of the anode O1, thereby improving the Flicker phenomenon at low brightness.

[0199] Furthermore, in the present invention, Fig. 9 In at least one embodiment of the pixel circuit shown, the potential of the anode of O1 is set by the transistor controlled by E1 and the transistor controlled by E2, rather than by the potential of the anode of O1 being set by the transistor controlled by the scanning signal, so that when the display panel to which the pixel circuit is applied operates at a low frequency, while maintaining the display period, the potential of the scanning signal does not need to be an effective voltage, thereby reducing the power consumption of the IC (integrated circuit) at low frequency.

[0200] In at least one embodiment of the present invention, the predetermined frequency may be, for example, 50 Hz, but is not limited thereto.

[0201] In at least one embodiment of the present invention, the display panel displays at low brightness may refer to: the maximum brightness corresponding to the display brightness range of the display panel is less than or equal to a predetermined brightness. The predetermined brightness may be greater than or equal to 100 nits and less than or equal to 140 nits, for example, the predetermined brightness may be 120 nits.

[0202] In at least one embodiment of the present invention, when the display panel is a display screen included in a mobile phone, the display brightness range can be adjusted by pulling a brightness adjustment bar of the mobile phone.

[0203] The display brightness range of the display panel may refer to: the display brightness of the display panel is greater than or equal to a first brightness and less than or equal to a second brightness, and the second brightness is the maximum brightness corresponding to the display brightness range;

[0204] The second brightness may refer to: the maximum brightness that the display panel can display;

[0205] The first brightness may refer to: a minimum brightness that the display panel can display.

[0206] In at least one embodiment of the present invention, the display brightness range of the display panel is within a predetermined brightness range, which does not mean that when the display panel displays a predetermined picture, the display brightness range of the display panel is within the predetermined brightness range, but means that when the display panel displays any picture, the display brightness range of the display panel is within the predetermined brightness range.

[0207] like Fig.11 As shown, in Figure 8 Based on at least one embodiment of the pixel circuit shown, the light emitting element is an organic light emitting diode O1; the second reset circuit 40 includes a third transistor T3;

[0208] The compensation control circuit 51 includes a fourth transistor T4, the data writing circuit 52 includes a fifth transistor T5, the driving circuit 12 includes a driving transistor T0, and the energy storage circuit includes a storage capacitor C1;

[0209] The gate of the third transistor T3 is electrically connected to the second light emitting control line E2, the source of the third transistor T3 is electrically connected to the second reset voltage line I2, and the drain of the third transistor T3 is electrically connected to the anode of O1;

[0210] The gate of the driving transistor T0 is electrically connected to the control terminal of the driving circuit 12, the drain of the driving transistor T0 is electrically connected to the first terminal of the driving circuit 12, and the source of the driving transistor T0 is electrically connected to the second terminal of the driving circuit 12;

[0211] The gate of the fourth transistor T4 is electrically connected to the second scan line S2, the source of the fourth transistor T4 is electrically connected to the gate of the driving transistor T0, and the drain of the fourth transistor T4 is electrically connected to the drain of the driving transistor;

[0212] The gate of the fifth transistor T5 is electrically connected to the third scan line S3, the source of the fifth transistor T5 is electrically connected to the data line D0, and the drain of the fifth transistor T5 is electrically connected to the source of the driving transistor T0;

[0213] The first end of the storage capacitor C1 is electrically connected to the gate of the driving transistor T0, and the second end of the storage capacitor C1 is electrically connected to the high voltage end; the high voltage end is used to provide a high voltage signal VDD;

[0214] The first light emitting control circuit includes a sixth transistor T6, and the second light emitting control circuit 22 includes a seventh transistor T7;

[0215] The gate of the sixth transistor T6 is electrically connected to the second light emitting control line E2, the source of the sixth transistor T6 is electrically connected to the drain of the driving transistor T0, and the drain of the sixth transistor T6 is electrically connected to the anode of O1;

[0216] The gate of the seventh transistor T7 is electrically connected to the first light emitting control line E1, the source of the seventh transistor T7 is electrically connected to the high voltage terminal, and the drain of the seventh transistor T7 is electrically connected to the source of the driving transistor T0;

[0217] The cathode of O1 is electrically connected to a low voltage terminal; the low voltage terminal is used to provide a low voltage signal VSS.

[0218] exist Fig.11 In at least one embodiment of the pixel circuit shown, T1, T2, T6, T7, T0 and T5 are all p-type transistors, and T3 and T4 are n-type transistors; T1, T2, T6, T7, T0 and T5 are all low-temperature polysilicon thin-film transistors, and T3 and T4 are IGZO thin-film transistors.

[0219] like Fig.10 As shown, the present invention is Fig.11 When at least one embodiment of the pixel circuit shown is in operation, a refresh display cycle may include a refresh reset phase t1, a refresh charging phase t2, and a refresh light emitting phase t3;

[0220] In the refresh reset phase t1, the potential of the first light-emitting control signal provided by E1 is a low voltage, the potential of the second light-emitting control signal provided by E2 is a high voltage, the potential of the first scanning signal provided by S1 is a low voltage, the potential of the second scanning signal provided by S2 is a high voltage, the potential of the third scanning signal provided by S3 is a high voltage, T1 and T2 are turned on, T3 is turned on, T4 is turned on, and T6 is turned off. The first reset voltage Vi1 provided by I1 is written into the gate of T0 so that T0 can be turned on at the beginning of the refresh charging phase; the second reset voltage Vi2 provided by I2 is written into the anode of O1 to clear the charge of the anode of O1;

[0221] In the refresh charging stage t2, the potential of the first light-emitting control signal provided by E1 is a high voltage, the potential of the second light-emitting control signal provided by E2 is a high voltage, the potential of the first scanning signal provided by S1 is a low voltage, the potential of the second scanning signal provided by S2 is a high voltage, the potential of the third scanning signal provided by S3 is a low voltage, T1 is turned off, T2 is turned on, T3 is turned on, so as to write Vi2 to the anode of O1, T4 and T5 are turned on; T6 and T7 are turned off;

[0222] At the beginning of the refresh charging phase t2, T0 is turned on, and the data voltage Vd on the data line charges C1 through T5, T4 and T0 to increase the potential of the gate of T0 until the potential of the gate of T0 becomes Vd+Vth, where Vth is the threshold voltage of T0, and T0 is turned off to stop charging;

[0223] In the refresh light-emitting stage t3, the potential of the first light-emitting control signal provided by E1 is a low voltage, the potential of the second light-emitting control signal provided by E2 is a low voltage, the potential of the first scanning signal provided by S1 is a high voltage, the potential of the second scanning signal provided by S2 is a low voltage, the potential of the third scanning signal provided by S3 is a high voltage, T1, T2, T3, T4 and T5 are all turned off, T6 and T7 are turned on, and T0 drives O1 to emit light;

[0224] During the time period between the refresh charging phase t2 and the refresh light emitting phase t3, E2 provides a high voltage signal and T3 is turned on to set the anode of O1.

[0225] In at least one embodiment of the present invention, the voltage value of Vi2 may be smaller than the voltage value of Vi1.

[0226] The present invention Fig.11When at least one embodiment of the pixel circuit shown is in operation, when the display panel to which the pixel circuit is applied is displayed at low brightness, that is, when the maximum brightness corresponding to the display brightness range is less than or equal to a predetermined brightness, the frequency of the second light-emitting control signal can be increased so that the frequency of the second light-emitting control signal is greater than the predetermined frequency, so as to increase the frequency of setting the potential of the anode O1, thereby improving the Flicker phenomenon at low brightness.

[0227] In at least one embodiment of the present invention, the predetermined frequency may be 50 Hz, and the predetermined brightness may be greater than or equal to 100 nits and less than or equal to 140 nits, but is not limited thereto.

[0228] Furthermore, in the present invention, Fig.11 In at least one embodiment of the pixel circuit shown, the potential of the anode of O1 is set by the transistor controlled by E2, rather than by the potential of the anode of O1 controlled by the transistor controlled by the scanning signal, so that when the display panel to which the pixel circuit is applied operates at a low frequency, the potential of the scanning signal does not need to be an effective voltage while maintaining the display period, thereby reducing the power consumption of the IC (integrated circuit) at low frequency.

[0229] like Fig.12 As shown, the present invention is Fig.11 When at least one embodiment of the pixel circuit shown is working, at low brightness, the frequency of the first light emitting control signal provided by E2 can be increased to improve the flickering phenomenon of O1 at low frequency and low brightness.

[0230] exist Fig.12 , the time labeled F11 is the first refresh frame time, the time labeled F12 is the first hold frame time; the time labeled F21 is the second refresh frame time, the time labeled F22 is the second hold frame time, the time labeled F31 is the third refresh frame time, and the time labeled F32 is the third hold frame time;

[0231] In the refresh frame time, there is a refresh charging phase. In the refresh charging phase, E2 provides a high voltage signal, S2 provides a high voltage signal, S3 provides a low voltage signal, and the data voltage provided by the data line D0 charges C1;

[0232] During the holding frame time, there is no charging phase, S2 can continuously provide a low voltage signal, and S3 can continuously provide a high voltage signal, so as to save power consumption.

[0233] Fig.13 and Fig.12 The difference is that: while maintaining the frame time, S3 provides a clock signal, but the frequency of the clock signal is lower, which can also save power consumption.

[0234] The driving method described in the embodiment of the present invention is applied to the above-mentioned pixel circuit, and the pixel circuit is applied to the display panel. The driving method includes: in the refresh reset stage and the hold reset stage, the first reset circuit controls the first reset voltage provided by the first reset voltage line to be written into the first end of the driving circuit under the control of the first light-emitting control signal provided by the first light-emitting control line and the reset control signal provided by the reset control line.

[0235] In the driving method of the pixel circuit described in the embodiment of the present invention, a first reset voltage is written into the first end of the driving circuit through a first reset circuit under the control of a first light-emitting control signal and a reset control signal. Through the cooperation of the compensation control circuit, the first reset voltage can be written into the control end of the driving circuit in the refresh reset stage and the hold reset stage, so that the reset of the key node can be achieved through a new pixel circuit structure.

[0236] Optionally, the pixel circuit also includes a compensation control circuit; the driving method may also include: in the refresh reset phase, the compensation control circuit controls the connection between the first end of the driving circuit and the control end of the driving circuit under the control of the second scanning signal provided by the second scanning line, so as to write the first reset voltage into the control end of the driving circuit, so that at the beginning of the refresh charging phase, the driving circuit can, under the control of the potential of its control end, turn on the connection between its first end and the second end.

[0237] In at least one embodiment of the present invention, the pixel circuit may further include a light-emitting element, a compensation control circuit, a data writing circuit, an energy storage circuit, a first light-emitting control circuit and a second light-emitting control circuit; the refresh display cycle also includes a refresh charging phase and a refresh light-emitting phase arranged after the refresh reset phase; the driving method may further include:

[0238] In the refresh charging stage, the data writing circuit writes the data voltage on the data line to the second end of the driving circuit under the control of the third scanning signal provided by the third scanning line, and the compensation control circuit controls the connection between the first end of the driving circuit and the control end of the driving circuit under the control of the second scanning signal, so as to charge the energy storage circuit through the data voltage and increase the potential of the control end of the driving circuit until the driving circuit disconnects the connection between the first end and the second end under the control of the potential of the control end;

[0239] In the refresh light-emitting stage, the first light-emitting control circuit controls the connection between the first end of the driving circuit and the first pole of the light-emitting element, and the second light-emitting control circuit controls the connection between the first voltage end and the second end of the driving circuit, and the driving circuit drives the light-emitting element to emit light.

[0240] Optionally, the pixel circuit further includes a first light emitting control circuit and a light emitting element; the reset control line is a second light emitting control line; the first light emitting control circuit is electrically connected to the first light emitting control line; and the driving method further includes:

[0241] In the refresh reset stage and the hold reset stage, the first light-emitting control circuit, under the control of the first light-emitting control signal, controls the connection between the first end of the driving circuit and the first pole of the light-emitting element to control the writing of the first reset voltage into the first pole of the light-emitting element to set the potential of the first pole of the light-emitting element to clear the residual charge in the first pole of the light-emitting element.

[0242] The driving method described in at least one embodiment of the present invention may further include:

[0243] Detect the display brightness range of the display panel, and when the maximum brightness corresponding to the display brightness range is less than or equal to a predetermined brightness, control to increase the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal provided by the second light-emitting control line so that the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal are greater than a predetermined frequency.

[0244] When it is detected that the maximum brightness corresponding to the display brightness range is less than or equal to the predetermined brightness, the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal can be increased so that the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal are greater than the predetermined frequency, and the frequency of setting the potential of the anode O1 is increased to improve the Flicker phenomenon at low brightness.

[0245] Optionally, the predetermined frequency may be 50 Hz, and the predetermined brightness may be greater than or equal to 100 nit and less than or equal to 140 nit.

[0246] Optionally, the pixel circuit further includes a first light emitting control circuit, a second reset circuit and a light emitting element; the first light emitting control circuit is electrically connected to the second light emitting control line; and the driving method further includes:

[0247] In the refresh reset stage and the hold reset stage, the first light-emitting control circuit, under the control of the second light-emitting control signal, controls the disconnection between the first end of the driving circuit and the first pole of the light-emitting element, and the second reset circuit, under the control of the second light-emitting control signal, writes the second reset voltage into the first pole of the light-emitting element.

[0248] When the pixel circuit also includes a second reset circuit, during the refresh reset stage and the hold reset stage, the second reset circuit can write a second reset voltage into the first electrode of the light-emitting element under the control of the second light-emitting control signal to set the potential of the first electrode of the light-emitting element.

[0249] The driving method described in at least one embodiment of the present invention may further include:

[0250] The display brightness range of the display panel is detected, and when the maximum brightness corresponding to the display brightness range is less than or equal to the predetermined brightness, the frequency of the second light-emitting control signal provided by the second light-emitting control line is controlled to be increased so that the frequency of the second light-emitting control signal is greater than the predetermined frequency.

[0251] When the display panel is displayed at low brightness, that is, when it is detected that the maximum brightness corresponding to the display brightness range of the display panel is less than or equal to a predetermined brightness, the frequency of the second light-emitting control signal can be increased so that the frequency of the second light-emitting control signal is greater than the predetermined frequency, thereby increasing the frequency of setting the potential of the first pole of the light-emitting element, thereby improving the Flicker phenomenon at low brightness.

[0252] In at least one embodiment of the present invention, the display maintenance period further includes a light maintenance phase arranged after the reset maintenance phase; and the driving method further includes:

[0253] In the light-maintaining stage, the first light-emitting control circuit controls the connection between the first end of the driving circuit and the first pole of the light-emitting element, and the second light-emitting control circuit controls the connection between the first voltage end and the second end of the driving circuit, and the driving circuit drives the light-emitting element to emit light.

[0254] The display device described in the embodiment of the present invention includes the above-mentioned pixel circuit.

[0255] The display device provided in the embodiment of the present invention can 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, etc.

[0256] 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, comprising a first reset circuit and a driving circuit; The first reset circuit is electrically connected to the first light-emitting control line, the reset control line, the first reset voltage line and the first end of the driving circuit respectively, and is used to control the first reset voltage provided by the first reset voltage line to be written into the first end of the driving circuit under the control of the first light-emitting control signal provided by the first light-emitting control line and the reset control signal provided by the reset control line; The driving circuit is used to conduct the connection between the first end of the driving circuit and the second end of the driving circuit under the control of the potential of the control end thereof; The pixel circuit further includes a first light emitting control circuit and a second light emitting control circuit; The first light-emitting control circuit is electrically connected to the first control line, the first end of the driving circuit and the first pole of the light-emitting element respectively, and is used to control the first end of the driving circuit to be connected to the first pole of the light-emitting element under the control of the first control line; The second light emitting control circuit is electrically connected to the second control line, the first voltage terminal and the second terminal of the driving circuit respectively, and is used to control the first voltage terminal to be connected to the second terminal of the driving circuit under the control of the second control line; The first control line is a first light-emitting control line, and the second control line is a second light-emitting control line; or, the first control line is a second light-emitting control line, and the second control line is a first light-emitting control line.

2. The pixel circuit according to claim 1, in, The first reset circuit includes a first transistor and a second transistor; The control electrode of the first transistor is electrically connected to the first light emitting control line, and the first electrode of the first transistor is electrically connected to the first end of the driving circuit; The control electrode of the second transistor is electrically connected to the reset control line, the first electrode of the second transistor is electrically connected to the second electrode of the first transistor, and the second electrode of the second transistor is electrically connected to the first reset voltage line.

3. The pixel circuit according to claim 2, in, The reset control line is a second light emitting control line, the first transistor is a p-type transistor, and the second transistor is an n-type transistor; the first control line is a first light emitting control line, and the second control line is a second light emitting control line.

4. The pixel circuit according to claim 1, in, The first reset circuit includes a first transistor and a second transistor; The control electrode of the first transistor is electrically connected to the reset control line, and the first electrode of the first transistor is electrically connected to the first end of the driving circuit; The control electrode of the second transistor is electrically connected to the first light emitting control line, the first electrode of the second transistor is electrically connected to the second electrode of the first transistor, and the second electrode of the second transistor is electrically connected to the first reset voltage line.

5. The pixel circuit according to claim 4, in, The reset control line is a second light emitting control line, the first transistor is an n-type transistor, and the second transistor is a p-type transistor; the first control line is a first light emitting control line, and the second control line is a second light emitting control line.

6. The pixel circuit according to claim 2 or 4, in, The reset control line is a first scan line, the first transistor and the second transistor are both p-type transistors; the first control line is a second light-emitting control line, and the second control line is a first light-emitting control line.

7. The pixel circuit according to claim 6, in, Also comprising a second reset circuit; The second reset circuit is electrically connected to the second light-emitting control line, the second reset voltage line and the first electrode of the light-emitting element respectively, and is used to write the second reset voltage provided by the second reset voltage line into the first electrode of the light-emitting element under the control of the second light-emitting control signal.

8. The pixel circuit according to claim 7, in, The second reset circuit includes a third transistor; The control electrode of the third transistor is electrically connected to the second light emitting control line, the first electrode of the third transistor is electrically connected to the second reset voltage line, and the second electrode of the third transistor is electrically connected to the first electrode of the light emitting element.

9. The pixel circuit according to claim 8, in, The third transistor is an n-type transistor.

10. The pixel circuit according to any one of claims 1 to 9, in, It also includes a compensation control circuit, a data writing circuit and an energy storage circuit; The compensation control circuit is electrically connected to the second scan line, the control end of the drive circuit and the first end of the drive circuit respectively, and is used to control the control end of the drive circuit to be connected to the first end of the drive circuit under the control of the second scan signal provided by the second scan line; The data writing circuit is electrically connected to the third scan line, the data line and the second end of the driving circuit respectively, and is used to write the data voltage on the data line into the second end of the driving circuit under the control of the third scan signal provided by the third scan line; The energy storage circuit is electrically connected to the control end of the drive circuit and is used for storing electric energy.

11. The pixel circuit according to claim 10, in, The compensation control circuit includes a fourth transistor, the data writing circuit includes a fifth transistor, the driving circuit includes a driving transistor, and the energy storage circuit includes a storage capacitor; The control electrode of the driving transistor is electrically connected to the control end of the driving circuit, the first electrode of the driving transistor is electrically connected to the first end of the driving circuit, and the second electrode of the driving transistor is electrically connected to the second end of the driving circuit; The control electrode of the fourth transistor is electrically connected to the second scan line, the first electrode of the fourth transistor is electrically connected to the control electrode of the driving transistor, and the second electrode of the fourth transistor is electrically connected to the first electrode of the driving circuit; The control electrode of the fifth transistor is electrically connected to the third scan line, the first electrode of the fifth transistor is electrically connected to the data line, and the second electrode of the fifth transistor is electrically connected to the second electrode of the driving transistor; The first end of the storage capacitor is electrically connected to the control electrode of the driving transistor, and the second end of the storage capacitor is electrically connected to the first voltage end.

12. The pixel circuit according to claim 3 or 5, in, The first light emitting control circuit includes a sixth transistor, and the second light emitting control circuit includes a seventh transistor; The control electrode of the sixth transistor is electrically connected to the first light-emitting control line, the first electrode of the sixth transistor is electrically connected to the first end of the driving circuit, and the second electrode of the sixth transistor is electrically connected to the first electrode of the light-emitting element; The control electrode of the seventh transistor is electrically connected to the second light emitting control line, the first electrode of the seventh transistor is electrically connected to the first voltage terminal, and the second electrode of the seventh transistor is electrically connected to the second terminal of the driving circuit; The second electrode of the light emitting element is electrically connected to the second voltage terminal.

13. The pixel circuit according to claim 6, in, The first light emitting control circuit includes a sixth transistor, and the second light emitting control circuit includes a seventh transistor; The control electrode of the sixth transistor is electrically connected to the second light emitting control line, the first electrode of the sixth transistor is electrically connected to the first end of the driving circuit, and the second electrode of the sixth transistor is electrically connected to the first electrode of the light emitting element; The control electrode of the seventh transistor is electrically connected to the first light-emitting control line, the first electrode of the seventh transistor is electrically connected to the first voltage terminal, and the second electrode of the seventh transistor is electrically connected to the second terminal of the driving circuit; The second electrode of the light emitting element is electrically connected to the second voltage terminal.

14. A driving method, applied to the pixel circuit according to any one of claims 1 to 13, wherein the pixel circuit is applied to a display panel, and the driving method include: In the refresh reset stage and the hold reset stage, the first reset circuit controls the first reset voltage provided by the first reset voltage line to be written into the first end of the driving circuit under the control of the first light control signal provided by the first light control line and the reset control signal provided by the reset control line; The refresh display cycle also includes a refresh light emitting phase arranged after the refresh reset phase; The driving method further comprises: In the refresh light-emitting stage, the first light-emitting control circuit controls the first terminal of the driving circuit to be connected to the first electrode of the light-emitting element under the control of the first control line, and the second light-emitting control circuit controls the first voltage terminal to be connected to the second terminal of the driving circuit under the control of the second control line, and the driving circuit drives the light-emitting element to emit light; The first control line is a first light-emitting control line, and the second control line is a second light-emitting control line; or, the first control line is a second light-emitting control line, and the second control line is a first light-emitting control line.

15. The driving method according to claim 14, in, The pixel circuit also includes a compensation control circuit; The driving method also includes: in the refresh reset stage, the compensation control circuit controls the connection between the first end of the driving circuit and the control end of the driving circuit under the control of the second scan signal provided by the second scan line, so as to write the first reset voltage into the control end of the driving circuit.

16. The driving method according to claim 14, in, The pixel circuit further includes a light emitting element, a compensation control circuit, a data writing circuit and an energy storage circuit; the refresh display cycle further includes a refresh charging phase arranged between the refresh reset phase and the refresh light emitting phase; the driving method further includes: In the refresh charging stage, the data write circuit writes the data voltage on the data line into the second end of the driving circuit under the control of the third scan signal provided by the third scan line, and the compensation control circuit controls the connection between the first end of the driving circuit and the control end of the driving circuit under the control of the second scan signal to charge the energy storage circuit through the data voltage.

17. The driving method according to claim 16, in, The pixel circuit further includes a first light emitting control circuit and a light emitting element; the reset control line is a second light emitting control line; The first light emitting control circuit is electrically connected to the first light emitting control line; and the driving method further includes: In the refresh reset stage and the hold reset stage, the first light emitting control circuit, under the control of the first light emitting control signal, controls the connection between the first end of the driving circuit and the first pole of the light emitting element to control the writing of the first reset voltage into the first pole of the light emitting element.

18. The driving method according to claim 16, in, The pixel circuit further includes a first light emitting control circuit, a second reset circuit and a light emitting element; the first light emitting control circuit is electrically connected to the second light emitting control line; the driving method further includes: In the refresh reset stage and the hold reset stage, the first light-emitting control circuit, under the control of the second light-emitting control signal, controls the disconnection between the first end of the driving circuit and the first pole of the light-emitting element, and the second reset circuit, under the control of the second light-emitting control signal, writes the second reset voltage into the first pole of the light-emitting element.

19. The driving method according to any one of claims 16 to 18, in, The display maintenance period also includes a light maintenance phase arranged after the reset maintenance phase; and the driving method also includes: In the light-maintaining stage, the first light-emitting control circuit controls the connection between the first end of the driving circuit and the first pole of the light-emitting element, and the second light-emitting control circuit controls the connection between the first voltage end and the second end of the driving circuit, and the driving circuit drives the light-emitting element to emit light.

20. The driving method according to claim 17, in, Also includes: Detect the display brightness range of the display panel, and when the maximum brightness corresponding to the display brightness range is less than or equal to a predetermined brightness, control to increase the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal provided by the second light-emitting control line so that the frequency of the first light-emitting control signal and the frequency of the second light-emitting control signal are greater than a predetermined frequency.

21. The driving method according to claim 18, in, Also includes: The display brightness range of the display panel is detected, and when the maximum brightness corresponding to the display brightness range is less than or equal to the predetermined brightness, the frequency of the second light-emitting control signal provided by the second light-emitting control line is controlled to be increased so that the frequency of the second light-emitting control signal is greater than the predetermined frequency.

22. A display device comprising the pixel circuit according to any one of claims 1 to 13.

Images