Pixel circuit, driving method thereof and display device

Abstract

The invention provides a pixel circuit, a driving method thereof and a display device, and relates to the field of display technologies. The pixel circuit comprises a first power supply, a second power supply, a first auxiliary light-emitting module, a second auxiliary light-emitting module, a switch element and a light-emitting module, the first end of the first auxiliary light-emitting module is electrically connected to the first power supply, and the second end of the first auxiliary light-emitting module is electrically connected to the first end of the switch element; the first end of the second auxiliary light-emitting module is electrically connected with the second power supply, and the second end of the second auxiliary light-emitting module is electrically connected with the first end of the switch element; the control end of the switch element is electrically connected to the composite signal end, and the second end of the switch element is electrically connected to the control end of the light-emitting module; in a light-emitting ending stage, the first auxiliary light-emitting module and the control end of the switch element jointly supply power to the switch element. The problem that the display device is prone to poor brightness uniformity and the problem that the display effect of the display device is poor are solved.

Description

Technical Field

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

[0002] Organic Light Emitting Diode (OLED) display devices have the advantages of self-luminescence, low driving voltage, fast response speed and high contrast, and are widely used in display devices.

[0003] The display device includes a pixel circuit and a plurality of pixel elements, wherein the pixel circuit is electrically connected to the plurality of pixel elements to control the pixel elements to emit light by adjusting the driving current of the pixel elements. However, the light emission time of the plurality of pixel elements in the above display device is inconsistent, and the display device is prone to poor brightness uniformity, resulting in poor display effect of the display device. Summary of the invention

[0004] The embodiments of the present application provide a pixel circuit and a driving method thereof, and a display device, so as to solve the problem that the display device is prone to poor brightness uniformity and the problem that the display device has poor display effect.

[0005] A first aspect of an embodiment of the present application provides a pixel circuit, including a first power supply, a second power supply, a first auxiliary light-emitting module, a second auxiliary light-emitting module, a switch element, and a light-emitting module;

[0006] A first end of the first auxiliary light-emitting module is electrically connected to the first power source, and a second end of the first auxiliary light-emitting module is electrically connected to a first end of the switch element;

[0007] A first end of the second auxiliary light-emitting module is electrically connected to the second power source, and a second end of the second auxiliary light-emitting module is electrically connected to the first end of the switch element;

[0008] The control end of the switch element is electrically connected to the composite signal end, and the second end of the switch element is electrically connected to the control end of the light emitting module;

[0009] When the light emission ends, the first auxiliary light emitting module and the control end of the switch element jointly supply power to the switch element.

[0010] By adopting the above technical solution, when in the light-emitting end stage, the first auxiliary light-emitting module and the second auxiliary light-emitting module are turned on, and the first power supply and the second power supply supply power to the first end of the switching element; and the switching element is turned on, and the first power supply and the second power supply supply power to the control end of the light-emitting module, so that the first auxiliary light-emitting module and the control end of the switching element jointly supply power to the switching element, thereby improving the closing speed of the switching element, so that the light-emitting element of the light-emitting module can be turned off more quickly, reducing the possibility of poor brightness uniformity in the display device, and improving the display effect of the display device.

[0011] In some possible implementations, the first auxiliary light emitting module includes a first transistor, a second transistor, a third transistor, a fourth transistor, a power supply transistor and a first capacitor;

[0012] The first end of the first transistor is electrically connected to the first power supply, the second end of the first transistor is electrically connected to the first end of the second transistor, and the control end of the first transistor is electrically connected to a first initialization signal end;

[0013] The second end of the second transistor is electrically connected to the first end of the switch element, and the control end of the second transistor is electrically connected to the first electrode of the first capacitor, and the second electrode of the first capacitor is electrically connected to the composite signal end;

[0014] The first end of the third transistor is electrically connected to the second end of the second transistor, the second end of the third transistor is electrically connected to the control end of the second transistor and the first electrode of the first capacitor, and the control end of the third transistor is electrically connected to the first initialization signal end;

[0015] The first end of the fourth transistor is electrically connected to a DC power supply, the second end of the fourth transistor is electrically connected to the control end of the second transistor, and the control end of the fourth transistor is electrically connected to a second initialization signal end;

[0016] The first end of the power supply transistor is electrically connected to the first power source, the second end of the power supply transistor is electrically connected to the first end of the second transistor, and the control end of the power supply transistor is electrically connected to the light emitting control signal end.

[0017] In some possible implementations, the second auxiliary light-emitting module includes a first power supply control element and a second power supply control element;

[0018] The first end of the first power supply control element is electrically connected to the second power supply, the second end of the first power supply control element is electrically connected to the first end of the switch element, and the control end of the first power supply control element is electrically connected to the light emitting control signal end; when the composite signal end is in the light emitting stage, the second power supply supplies power to the first end of the switch element through the first power supply control element;

[0019] The first end of the second power supply control element is electrically connected to the second power supply, the second end of the second power supply control element is electrically connected to the first end of the switch element, and the control end of the second power supply control element is electrically connected to the first initialization signal end.

[0020] In some possible implementations, the pixel circuit further includes an adjustment module, and the adjustment module includes a first adjustment element, a second adjustment element, and a second capacitor;

[0021] The first end of the first regulating element is electrically connected to a DC power supply, the second end of the first regulating element is electrically connected to the first end of the fourth transistor, and the second end of the first regulating element is also electrically connected to the control end of the switch element, and the control end of the first regulating element is electrically connected to the second initialization signal end;

[0022] The first end of the second regulating element is electrically connected to the second end of the switch element, the second end of the second regulating element is electrically connected to the control end of the switch element, and the control end of the second regulating element is electrically connected to the first initialization signal end;

[0023] A first electrode of the second capacitor is electrically connected to the composite signal terminal, and a second electrode of the second capacitor is electrically connected to the control terminal of the switch element.

[0024] In some possible implementations, the potential of the first power supply is greater than the potential of the second power supply.

[0025] In some possible implementations, the light emitting module includes a third power source, a light emitting element, and a light emitting control element;

[0026] The first end of the light emitting control element is electrically connected to the third power source, the control end of the light emitting control element is electrically connected to the second end of the switch element; and the second end of the light emitting control element is electrically connected to the light emitting element, so as to control the light emitting element through the light emitting control element;

[0027] Preferably, the potential of the first power supply is greater than the potential of the second power supply, and the potential of the second power supply is less than the potential of the third power supply.

[0028] In some possible implementations, the pixel circuit further includes a fifth transistor, a sixth transistor, a third capacitor, and a fourth capacitor;

[0029] The first end of the fifth transistor is electrically connected to the second end of the light emitting control element, the second end of the fifth transistor is electrically connected to the first end of the light emitting element, and the control end of the fifth transistor is electrically connected to the data signal end;

[0030] The first end of the sixth transistor is electrically connected to the data signal end, the second end of the sixth transistor is electrically connected to the control end of the fifth transistor, and the control end of the sixth transistor is electrically connected to the second initial signal end;

[0031] A first electrode of the third capacitor is electrically connected to the second end of the switch element, and a second electrode of the third capacitor is electrically connected to the third power supply;

[0032] A first electrode of the fourth capacitor is electrically connected to the second end of the sixth transistor, and a second electrode of the fourth capacitor is electrically connected to the third power supply;

[0033] Alternatively, the pixel circuit further includes a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a third capacitor and a fourth capacitor;

[0034] The first end of the fifth transistor is electrically connected to the second end of the light emitting control element, the second end of the fifth transistor is electrically connected to the first end of the light emitting element, and the control end of the fifth transistor is electrically connected to a DC power supply;

[0035] The first end of the sixth transistor is electrically connected to the data signal end, the second end of the sixth transistor is electrically connected to the first end of the fifth transistor, and the control end of the sixth transistor is electrically connected to the second initial signal end;

[0036] The first end of the seventh transistor is electrically connected to the control end of the fifth transistor, the second end of the seventh transistor is electrically connected to the second end of the fifth transistor, and the control end of the seventh transistor is electrically connected to the second initial signal end;

[0037] The first end of the eighth transistor is electrically connected to the DC power supply, the second end of the eighth transistor is electrically connected to the control end of the fifth transistor, and the control end of the eighth transistor is electrically connected to the third initial signal end;

[0038] A first electrode of the third capacitor is electrically connected to the second end of the switch element, and a second electrode of the third capacitor is electrically connected to the third power supply;

[0039] A first electrode of the fourth capacitor is electrically connected to the second end of the seventh transistor, and a second electrode of the fourth capacitor is electrically connected to the third power supply.

[0040] A second aspect of an embodiment of the present application provides a driving method for a pixel circuit, including:

[0041] When the light is at the end stage,

[0042] Controlling the first auxiliary light-emitting module and the second auxiliary light-emitting module to be turned on, and the first power supply and the second power supply to supply power to the first end of the switch element;

[0043] Controlling the switch element to be turned on, so that the first power source and the second power source supply power to the control end of the light emitting module;

[0044] The light emitting element of the light emitting module is controlled to be turned off.

[0045] By adopting the above technical solution, when in the light-emitting end stage, the first auxiliary light-emitting module and the second auxiliary light-emitting module are turned on, and the first power supply and the second power supply supply power to the first end of the switching element; and the switching element is turned on, and the first power supply and the second power supply supply power to the control end of the light-emitting module, so that the first auxiliary light-emitting module and the control end of the switching element jointly supply power to the switching element, thereby improving the closing speed of the switching element, so that the light-emitting element of the light-emitting module can be turned off more quickly, reducing the possibility of poor brightness uniformity in the display device, and improving the display effect of the display device.

[0046] In some possible implementations, when in the first initialization phase;

[0047] Controlling the first regulating element of the first regulating module to be turned on, and the second initial signal end to supply power to the second end of the switch element;

[0048] When in the second initialization stage;

[0049] The second regulating element of the first regulating module and the second auxiliary module are controlled to be turned on, the second power supply supplies power to the first end of the switch element, and the second end of the switch element and the control end of the switch element are turned on.

[0050] A third aspect of an embodiment of the present application provides a display device, which includes the above-mentioned pixel circuit.

[0051] An embodiment of the present application provides a display device. Since the display device includes any of the pixel circuits described above, the advantages of the pixel circuits described above can be found in the relevant description above and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0053] Figure 1 A schematic diagram of a pixel circuit provided in an embodiment of the present application;

[0054] Figure 2 Provided in the embodiments of this application Figure 1 A schematic diagram of a first auxiliary light-emitting module in the pixel circuit shown;

[0055] Figure 3 Provided in the embodiments of this application Figure 1 A schematic diagram of a second auxiliary light-emitting module in the pixel circuit shown;

[0056] Figure 4 Provided in the embodiments of this application Figure 1 A schematic diagram of a regulating module in the pixel circuit shown;

[0057] Figure 5 Provided in the embodiments of this application Figure 1 A schematic diagram of a light emitting module in the pixel circuit shown;

[0058] Figure 6 A schematic diagram of a pixel circuit according to another embodiment of the present application;

[0059] Figure 7 Provided in the embodiments of this application Figure 6 A schematic diagram of a light emitting module in the pixel circuit shown;

[0060] Figure 8 A timing diagram of a driving method for a pixel circuit provided in an embodiment of the present application;

[0061] Fig. 9 A schematic diagram of the PW point potential provided in an embodiment of the present application.

[0062] Description of reference numerals:

[0063] 100. A first auxiliary light-emitting module;

[0064] 110, a first transistor; 120, a second transistor; 130, a third transistor; 140, a fourth transistor; 150, a first capacitor; 160, a control transistor; 170, a power supply transistor;

[0065] 200. A second auxiliary light-emitting module;

[0066] 210, a first power supply control element; 220, a second power supply control element;

[0067] 300, switch element;

[0068] 400. Light emitting module;

[0069] 410, a third power source; 420, a light emitting element; 430, a light emitting control element; 440, a fifth transistor; 450, a sixth transistor; 460, a third capacitor; 470, a fourth capacitor; 480, a seventh transistor; 490, an eighth transistor;

[0070] 500, adjustment module;

[0071] 510, first regulating element; 520, second regulating element; 530, second capacitor; 540, third regulating element.

[0072] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0073] As described in the background technology, the display device includes a pixel circuit and a plurality of pixel elements, and the pixel circuit is electrically connected to the plurality of pixel elements to control the pixel elements to emit light by adjusting the driving current of the pixel elements. However, due to differences in the arrangement of the plurality of pixel elements in the display device, when the light emission ends, the light emission time of the light emitting elements in the plurality of pixel elements is inconsistent, and the display device is prone to poor brightness uniformity, resulting in poor display effect of the display device.

[0074] In order to solve the above technical problems, the embodiments of the present application provide a pixel circuit and a driving method thereof, and a display device. The pixel circuit includes a first power supply, a second power supply, a first auxiliary light-emitting module, a second auxiliary light-emitting module, a switching element and a light-emitting module. When in the end stage of light emission, the first auxiliary light-emitting module and the second auxiliary light-emitting module are turned on, and the first power supply and the second power supply supply power to the first end of the switching element; and, the switching element is turned on, and the first power supply and the second power supply supply power to the control end of the light-emitting module, so that the first auxiliary light-emitting module and the control end of the switching element jointly supply power to the switching element, thereby improving the closing speed of the switching element, so that the light-emitting element of the light-emitting module can be turned off faster, reducing the possibility of poor brightness uniformity in the display device, and improving the display effect of the display device.

[0075] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0076] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0077] Reference Figure 1-Figure 5, the embodiment of the present application provides a pixel circuit, including a first power supply (i.e., VDDF), a second power supply (i.e., VDDW), a first auxiliary light-emitting module 100, a second auxiliary light-emitting module 200, a switch element 300 (i.e., T2) and a light-emitting module 400; wherein, a first end of the first auxiliary light-emitting module 100 is electrically connected to the first power supply, and a second end of the first auxiliary light-emitting module 100 is electrically connected to a first end of the switch element 300 (i.e., point N in the figure), so that the first power supply can supply power to the first end of the switch element 300 through the first auxiliary light-emitting module 100; a first end of the second auxiliary light-emitting module 200 is electrically connected to the second power supply, and a second end of the second auxiliary light-emitting module 200 is electrically connected to a first end of the switch element 300, so that the second power supply can supply power to the first end of the switch element 300 through the first auxiliary light-emitting module 100;

[0078] Exemplarily, the control end of the switch element 300 is electrically connected to the composite signal end (i.e., Sweep / Date t), and the second end of the switch element 300 is electrically connected to the control end of the light-emitting module 400, so that the light-emitting module 400 is controlled to emit light through the switch element 300; when in the end stage of light emission, the first auxiliary light-emitting module 100 and the control end of the switch element 300 jointly supply power to the switch element 300, thereby increasing the closing speed of the switch element 300, so that the light-emitting element 420 of the light-emitting module 400 can be turned off faster, reducing the possibility of poor brightness uniformity in the display device and improving the display effect of the display device.

[0079] It is easy to understand that in the embodiment of the present application, C1-C4, etc. are all set as capacitors, and capacitors C1-C4, etc. all have two relatively parallel electrodes; wherein, in the embodiment of the present application, the first electrode of the capacitor is set as one of the two electrodes, and the second electrode of the capacitor is set as the other of the two electrodes.

[0080] T1-T16 and the like are all configured as transistors, and the transistors T1-T16 and the like all have a source, a gate, and a drain; wherein, in the embodiment of the present application, the first end of the transistor is configured as one of the source and the drain, the second end of the transistor is configured as the other of the source and the drain, the control end of the transistor is configured as the gate of the transistor, and the transistor is configured such that: when the gate of the transistor receives a high-level signal, the transistor is turned off; and when the gate of the transistor receives a low-level signal, the transistor is turned on;

[0081] Reference Figure 1 and Figure 2 In some possible implementations, the first auxiliary light-emitting module 100 includes a first transistor 110 (ie, T12), a second transistor 120 (ie, T4), a third transistor 130 (ie, T11), a fourth transistor 140 (ie, T9), a power supply transistor 170 (ie, T18), and a first capacitor 150 (ie, C2);

[0082] The first end of the first transistor 110 is electrically connected to the first power source, the second end of the first transistor 110 is electrically connected to the first end of the second transistor 120, and the control end of the first transistor 110 is electrically connected to the first initialization signal end (ie, Gn);

[0083] The second end of the second transistor 120 is electrically connected to the first end of the switch element 300, and the control end of the second transistor 120 is electrically connected to the first electrode of the first capacitor 150, and the second electrode of the first capacitor 150 is electrically connected to the composite signal end;

[0084] The first end of the third transistor 130 is electrically connected to the second end of the second transistor 120, the second end of the third transistor 130 is electrically connected to the control end of the second transistor 120 and the first electrode of the first capacitor 150, and the control end of the third transistor 130 is electrically connected to the first initialization signal end;

[0085] The first end of the fourth transistor 140 can be directly connected to the DC power supply (i.e., Vinit3), and the fourth transistor 140 can also be electrically connected to the DC power supply (i.e., Vinit3) through other components, the second end of the fourth transistor 140 is electrically connected to the control end of the second transistor 120, and the control end of the fourth transistor 140 is electrically connected to the second initialization signal end (i.e., Gn-1);

[0086] A first terminal of the power supply transistor 170 is electrically connected to the first power source, a second terminal of the power supply transistor 170 is electrically connected to the first terminal of the second transistor 120 , and a control terminal of the power supply transistor 170 is electrically connected to the light emitting control signal terminal (ie, EM2 ).

[0087] Exemplarily, the first auxiliary light-emitting module 100 also includes a control transistor 160 (i.e., T15), the first end of the control transistor 160 is electrically connected to the second end of the second transistor 120, and the second end of the control transistor 160 is electrically connected to the first end of the switching element 300, and the control end of the control transistor 160 is electrically connected to the light-emitting control signal end.

[0088] By adopting the above technical solution, when in the light-emitting preparation stage, the first initialization signal terminal sends a low-level signal, the first transistor 110 and the third transistor 130 are in the on state, the second end of the second transistor 120 is connected to the control end of the second transistor 120, the second transistor 120 is diode-ized, and the first auxiliary light-emitting module 100 can compensate for the potential of the control end of the second transistor 120 (i.e., point M in the figure), so that the potential of the control end of the second transistor 120 is equal to the sum of the potential of the first power supply and the on-voltage of the second transistor 120 (i.e., Vth4) (i.e., VM=VDDF+Vth4).

[0089] Reference Figure 1 and Figure 3 , exemplarily, the second auxiliary light emitting module 200 includes a first power supply control element 210 (ie, T14) and a second power supply control element 220 (ie, T13);

[0090] The first end of the first power supply control element 210 is electrically connected to the second power supply, the second end of the first power supply control element 210 is electrically connected to the first end of the switch element 300, and the control end of the first power supply control element 210 is electrically connected to the light-emitting control signal end; when the composite signal end is in the light-emitting stage, the second power supply supplies power to the first end of the switch element 300 through the first power supply control element 210;

[0091] A first end of the second power supply control element 220 is electrically connected to the second power supply, a second end of the second power supply control element 220 is electrically connected to the first end of the switch element 300 , and a control end of the second power supply control element 220 is electrically connected to the first initialization signal end.

[0092] Reference Figure 1 and Figure 4 In some possible implementations, the pixel circuit further includes an adjustment module 500, and the adjustment module 500 includes a first adjustment element 510 (ie, T8), a second adjustment element 520 (ie, T10), and a second capacitor 530 (ie, C1);

[0093] The first end of the first regulating element 510 is electrically connected to the DC power supply (i.e., Vinit3), the second end of the first regulating element 510 is electrically connected to the first end of the fourth transistor 140, and the second end of the first regulating element 510 is also electrically connected to the control end of the switch element 300, and the control end of the first regulating element 510 is electrically connected to the second initialization signal end;

[0094] The first end of the second regulating element 520 is electrically connected to the second end of the switching element 300, the second end of the second regulating element 520 is electrically connected to the control end of the switching element 300, and the control end of the second regulating element 520 is electrically connected to the first initialization signal end; the first pole of the second capacitor 530 is electrically connected to the composite signal end, and the second pole of the second capacitor 530 is electrically connected to the control end of the switching element 300.

[0095] The regulation module 500 also includes a third regulation element 540 (i.e., T7), a first end of the third regulation element 540 is electrically connected to a DC power supply (i.e., Vinit1), a second end of the third regulation element 540 is electrically connected to a control end of the switching element 300 and a second end of the second regulation element 520, and the control end of the third regulation element 540 is electrically connected to a reset signal end (i.e., Set).

[0096] By adopting the above technical solution, when in the light-emitting preparation stage, the first initialization signal terminal sends a low-level signal, the second regulating element 520 is in the on state, the second end of the switching element 300 is connected to the control end of the switching element 300, the switching element 300 is diode-ized, and the regulating module 500 can compensate for the potential of the control end of the switching element 300 (i.e., point S in the figure), so that the potential of the control end of the switching element 300 is equal to the sum of the potential of the second power supply and the on-state voltage (i.e., Vth2) of the switching element 300 (i.e., VS=VDDW+Vth2).

[0097] Exemplarily, the potential of the first power supply can be greater than the potential of the second power supply, that is, VDDF>VDDW, thereby reducing the gate-source voltage difference of the switching element 300, so that the gate-source voltage difference of the switching element 300 is set to: VGS=VDDW+Vth2-VDDF, so that the switching element 300 is turned on more fully, further reducing the possibility of poor brightness uniformity in the display device, and improving the display effect of the display device.

[0098] The following is combined with Figure 1 and Figure 5 The structure of the light emitting module 400 is described. Exemplarily, the light emitting module 400 includes a third power source 410 (ie, VDDA), a light emitting element 420 (ie, T5), and a light emitting control element 430 (ie, T3);

[0099] A first end of the light emitting control element 430 is electrically connected to the third power source 410, and a control end of the light emitting control element 430 (i.e., point PW in the figure) is electrically connected to a second end of the switch element 300; and a second end of the light emitting control element 430 is electrically connected to the light emitting element 420, and a control end of the light emitting element 420 is connected to a light emitting signal control end (i.e., EM1), so that the light emitting element 420 is controlled by the light emitting control element 430;

[0100] Exemplarily, the potential of the first power supply is greater than the potential of the second power supply, and the potential of the second power supply is less than the potential of the third power supply 410, that is, VDDF>VDDW>VDDA, so that the light-emitting control element 430 can be turned on more fully and the closing speed of the light-emitting element 420 can be increased; and by changing the voltage difference between the first power supply, the second power supply and the third power supply 410, the rewriting speed can be controlled to improve the tolerance of the pixel circuit to the transistor.

[0101] In some possible implementations, the pixel circuit further includes a fifth transistor 440 (ie, T1), a sixth transistor 450 (ie, T6), a third capacitor 460 (ie, C3), and a fourth capacitor 470 (ie, C4);

[0102] The first end of the fifth transistor 440 is electrically connected to the second end of the light emitting control element 430, the second end of the fifth transistor 440 is electrically connected to the first end of the light emitting element 420, and the control end of the fifth transistor 440 is electrically connected to the data signal end (ie, Date I);

[0103] A first end of the sixth transistor 450 is electrically connected to the data signal end, a second end of the sixth transistor 450 is electrically connected to the control end of the fifth transistor 440, and the control end of the sixth transistor 450 is electrically connected to the second initial signal end;

[0104] A first electrode of the third capacitor 460 is electrically connected to the second end of the switch element 300 , and a second electrode of the third capacitor 460 is electrically connected to the third power supply 410 ; a first electrode of the fourth capacitor 470 is electrically connected to the second end of the sixth transistor 450 , and a second electrode of the fourth capacitor 470 is electrically connected to the third power supply 410 .

[0105] Or, refer to Figure 6 and Figure 7 , the pixel circuit may further include a fifth transistor 440 (ie, T1), a sixth transistor 450 (ie, T6), a seventh transistor 480 (ie, T16), an eighth transistor 490 (ie, T17), a third capacitor 460 (ie, C3), and a fourth capacitor 470 (ie, C4);

[0106] The first end of the fifth transistor 440 is electrically connected to the second end of the light emitting control element 430, the second end of the fifth transistor 440 is electrically connected to the first end of the light emitting element 420, and the control end of the fifth transistor 440 is electrically connected to the DC power supply (ie, Vinit2);

[0107] A first end of the sixth transistor 450 is electrically connected to the data signal end (ie, Date I), a second end of the sixth transistor 450 is electrically connected to the first end of the fifth transistor 440, and a control end of the sixth transistor 450 is electrically connected to the second initial signal end;

[0108] A first terminal of the seventh transistor 480 is electrically connected to the control terminal of the fifth transistor 440 , a second terminal of the seventh transistor 480 is electrically connected to the second terminal of the fifth transistor 440 , and a control terminal of the seventh transistor 480 is electrically connected to the second initial signal terminal;

[0109] A first end of the eighth transistor 490 is electrically connected to the DC power supply (ie, Vinit2), a second end of the eighth transistor 490 is electrically connected to the control end of the fifth transistor 440, and the control end of the eighth transistor 490 is electrically connected to the third initial signal end (ie, Gn-2);

[0110] A first electrode of the third capacitor 460 is electrically connected to the second end of the switch element 300 , and a second electrode of the third capacitor 460 is electrically connected to the third power supply 410 ; a first electrode of the fourth capacitor 470 is electrically connected to the second end of the seventh transistor 480 , and a second electrode of the fourth capacitor 470 is electrically connected to the third power supply 410 .

[0111] To sum up, when in the end stage of light emission, the first auxiliary light-emitting module 100 and the second auxiliary light-emitting module 200 are turned on, and the first power supply and the second power supply supply power to the first end of the switching element 300; and, the switching element 300 is turned on, and the first power supply and the second power supply supply power to the control end of the light-emitting module 400, so that the control ends of the first auxiliary light-emitting module 100 and the switching element 300 jointly supply power to the switching element 300, thereby increasing the closing speed of the switching element 300, so that the light-emitting element 420 of the light-emitting module 400 can be turned off faster, reducing the possibility of poor brightness uniformity in the display device and improving the display effect of the display device.

[0112] A second aspect of an embodiment of the present application provides a driving method for a pixel circuit, comprising: when in the end stage of light emission, controlling the first auxiliary light-emitting module 100 and the second auxiliary light-emitting module 200 to be turned on, and the first power supply and the second power supply to supply power to the first end of the switching element 300; controlling the switching element 300 to be turned on, and the first power supply and the second power supply to supply power to the control end of the light-emitting module 400; and controlling the light-emitting element 420 of the light-emitting module 400 to be turned off.

[0113] In some possible implementations, when in the first initialization stage, the first regulating element 510 of the first regulating module 500 is controlled to be turned on, and the second initial signal terminal supplies power to the second terminal of the switch element 300;

[0114] When in the second initialization stage, the second regulating element 520 of the first regulating module 500 and the second auxiliary module are controlled to be turned on, the second power supply supplies power to the first end of the switch element 300, and the second end of the switch element 300 and the control end of the switch element 300 are turned on.

[0115] The following is combined with Figure 1 and Figure 8 A driving method for a pixel circuit is described, wherein the working process of the pixel circuit includes an initialization stage (i.e., time t1-time t2), a data writing stage (i.e., time t3), a light-emitting preparation stage (i.e., time t4-time t6), a light-emitting stage (i.e., part at time t7) and a light-emitting end stage (i.e., the rest at time t7), the initialization stage includes a first initialization stage (i.e., time t1) and a second initialization stage (i.e., time t2), and the driving method specifically includes the following steps:

[0116] At time t1, the second initialization signal terminal (i.e., Gn-1) and the composite signal terminal (i.e., Sweep / Date t) send low-level signals, the sixth transistor 450 (i.e., T6), the first regulating element 510 (i.e., T8) and the fourth transistor 140 (i.e., T9) are turned on, the control terminal of the fifth transistor 440 (i.e., T1) writes the potential of the control current, and the potential of the control current is stored in the fourth capacitor 470 (i.e., C4);

[0117] At time t2, the first initialization signal terminal (i.e., Gn) sends a low-level signal, the first transistor 110 (i.e., T12) and the third transistor 130 (i.e., T11) are in the on state, the second terminal of the second transistor 120 (i.e., T4) is connected to the control terminal of the second transistor 120, the second transistor 120 is diode-ized, and the first auxiliary light-emitting module 100 can compensate the potential of the control terminal of the second transistor 120 (i.e., point M in the figure), so that the potential of the control terminal of the second transistor 120 is equal to the sum of the potential of the first power supply (i.e., VDDF) and the on-voltage (i.e., Vth4) of the second transistor 120 (i.e., VM=VDDF+Vth4);

[0118] The second regulating element 520 (i.e., T10) is in the on state, the second end of the switch element 300 (i.e., T2) is connected to the control end of the switch element 300, the switch element 300 is diode-transformed, and the regulating module 500 can compensate the potential of the control end of the switch element 300 (i.e., point S in the figure), so that the potential of the control end of the switch element 300 is equal to the sum of the potential of the second power supply (i.e., VDDW) and the on-voltage (i.e., Vth2) of the switch element 300 (i.e., VS=VDDW+Vth2);

[0119] At time t3, all row data of multiple pixel elements are written;

[0120] At time t4, the signal sent by the composite signal terminal is converted into a ramp signal;

[0121] At time t5, the reset signal terminal (i.e., Set) sends a low level signal, the third adjustment element 540 (i.e., T7) is in a conducting state, thereby storing the potential of the DC power supply (i.e., Vinit1), and the control terminal of the light emitting control element 430 (i.e., point PW in the figure) is in a low potential;

[0122] At time t6, the light-emitting control signal terminal (ie, EM2) sends a low-level signal, and the signal potential sent by the composite signal terminal gradually decreases, thereby preparing for the light-emitting element 420 to emit light;

[0123] At time t7, the light-emitting signal control terminal (i.e., EM1) sends a low-level signal, and the light-emitting element 420 emits light; when in the light-emitting end stage, the first auxiliary light-emitting module 100 and the second auxiliary light-emitting module 200 are turned on, and the first power supply and the second power supply supply power to the first end of the switch element 300; and the switch element 300 is turned on, and the first power supply and the second power supply supply power to the control terminal of the light-emitting module 400, so that the control terminals of the first auxiliary light-emitting module 100 and the switch element 300 jointly supply power to the switch element 300, thereby improving the closing speed of the switch element 300.

[0124] exist Figure 8 In the embodiment, when it is in the end stage of light emission, that is, at time t7, the first auxiliary light-emitting module 100 and the second auxiliary light-emitting module 200 are turned on, and the first power supply and the second power supply supply power to the first end (that is, point N) of the switching element 300, so that the potential of the first end of the switching element 300 increases rapidly, thereby improving the conduction speed of the switching element 300.

[0125] Fig. 9 Schematic diagram of the potential of the PW point provided in the embodiment of the present application, wherein the broken line a is the potential change broken line of the PW point in the ideal state, the broken line b is the potential change broken line of the PW point in the related art, and the broken line c is the potential change broken line of the PW point in the pixel circuit provided in the embodiment of the present application; Fig. 9 As shown, when in the end stage of light emission, compared with the pixel circuit in the related art, the pixel circuit provided in the embodiment of the present application can quickly increase the potential of the PW point, increase the closing speed of the switching element, and enable the light-emitting element of the light-emitting module to be turned off faster.

[0126] An embodiment of the present application also provides a display device, which includes the above-mentioned pixel circuit.

[0127] An embodiment of the present application provides a display device. Since it includes the pixel circuit described in any of the above embodiments, the display device includes the advantages of the pixel circuit described in any of the above embodiments. For details, please refer to the relevant description above, which will not be repeated here.

[0128] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0129] In the description of the present invention, it should be understood that the terms "including" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0130] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pixel circuit, characterized in that: It includes a first power source, a second power source, a first auxiliary light-emitting module, a second auxiliary light-emitting module, a switch element and a light-emitting module; A first end of the first auxiliary light-emitting module is electrically connected to the first power source, and a second end of the first auxiliary light-emitting module is electrically connected to a first end of the switch element; A first end of the second auxiliary light-emitting module is electrically connected to the second power source, and a second end of the second auxiliary light-emitting module is electrically connected to the first end of the switch element; The control end of the switch element is electrically connected to the composite signal end, and the second end of the switch element is electrically connected to the control end of the light emitting module; When the light emission ends, the first auxiliary light emitting module and the control end of the switch element jointly supply power to the switch element.

2. The pixel circuit according to claim 1, characterized in that: The first auxiliary light emitting module includes a first transistor, a second transistor, a third transistor, a fourth transistor, a power supply transistor and a first capacitor; The first end of the first transistor is electrically connected to the first power supply, the second end of the first transistor is electrically connected to the first end of the second transistor, and the control end of the first transistor is electrically connected to a first initialization signal end; The second end of the second transistor is electrically connected to the first end of the switch element, and the control end of the second transistor is electrically connected to the first electrode of the first capacitor, and the second electrode of the first capacitor is electrically connected to the composite signal end; The first end of the third transistor is electrically connected to the second end of the second transistor, the second end of the third transistor is electrically connected to the control end of the second transistor and the first electrode of the first capacitor, and the control end of the third transistor is electrically connected to the first initialization signal end; The first end of the fourth transistor is electrically connected to a DC power supply, the second end of the fourth transistor is electrically connected to the control end of the second transistor, and the control end of the fourth transistor is electrically connected to a second initialization signal end; The first end of the power supply transistor is electrically connected to the first power source, the second end of the power supply transistor is electrically connected to the first end of the second transistor, and the control end of the power supply transistor is electrically connected to the light emitting control signal end.

3. The pixel circuit according to claim 1, characterized in that: The second auxiliary light emitting module includes a first power supply control element and a second power supply control element; The first end of the first power supply control element is electrically connected to the second power supply, the second end of the first power supply control element is electrically connected to the first end of the switch element, and the control end of the first power supply control element is electrically connected to the light emitting control signal end; when the composite signal end is in the light emitting stage, the second power supply supplies power to the first end of the switch element through the first power supply control element; The first end of the second power supply control element is electrically connected to the second power supply, the second end of the second power supply control element is electrically connected to the first end of the switch element, and the control end of the second power supply control element is electrically connected to the first initialization signal end.

4. The pixel circuit according to claim 2, characterized in that: The pixel circuit further includes an adjustment module, wherein the adjustment module includes a first adjustment element, a second adjustment element and a second capacitor; The first end of the first regulating element is electrically connected to a DC power supply, the second end of the first regulating element is electrically connected to the first end of the fourth transistor, and the second end of the first regulating element is also electrically connected to the control end of the switch element, and the control end of the first regulating element is electrically connected to the second initialization signal end; The first end of the second regulating element is electrically connected to the second end of the switch element, the second end of the second regulating element is electrically connected to the control end of the switch element, and the control end of the second regulating element is electrically connected to the first initialization signal end; A first electrode of the second capacitor is electrically connected to the composite signal terminal, and a second electrode of the second capacitor is electrically connected to the control terminal of the switch element.

5. The pixel circuit according to any one of claims 1 to 4, characterized in that: The potential of the first power supply is greater than the potential of the second power supply.

6. The pixel circuit according to claim 1, characterized in that: The light emitting module comprises a third power source, a light emitting element and a light emitting control element; The first end of the light emitting control element is electrically connected to the third power source, the control end of the light emitting control element is electrically connected to the second end of the switch element; and the second end of the light emitting control element is electrically connected to the light emitting element, so as to control the light emitting element through the light emitting control element; Preferably, the potential of the first power supply is greater than the potential of the second power supply, and the potential of the second power supply is less than the potential of the third power supply.

7. The pixel circuit according to claim 5, characterized in that: The pixel circuit further includes a fifth transistor, a sixth transistor, a third capacitor and a fourth capacitor; The first end of the fifth transistor is electrically connected to the second end of the light emitting control element, the second end of the fifth transistor is electrically connected to the first end of the light emitting element, and the control end of the fifth transistor is electrically connected to the data signal end; The first end of the sixth transistor is electrically connected to the data signal end, the second end of the sixth transistor is electrically connected to the control end of the fifth transistor, and the control end of the sixth transistor is electrically connected to the second initial signal end; A first electrode of the third capacitor is electrically connected to the second end of the switch element, and a second electrode of the third capacitor is electrically connected to the third power supply; A first electrode of the fourth capacitor is electrically connected to the second end of the sixth transistor, and a second electrode of the fourth capacitor is electrically connected to the third power supply; Alternatively, the pixel circuit further includes a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a third capacitor and a fourth capacitor; The first end of the fifth transistor is electrically connected to the second end of the light emitting control element, the second end of the fifth transistor is electrically connected to the first end of the light emitting element, and the control end of the fifth transistor is electrically connected to a DC power supply; The first end of the sixth transistor is electrically connected to the data signal end, the second end of the sixth transistor is electrically connected to the first end of the fifth transistor, and the control end of the sixth transistor is electrically connected to the second initial signal end; The first end of the seventh transistor is electrically connected to the control end of the fifth transistor, the second end of the seventh transistor is electrically connected to the second end of the fifth transistor, and the control end of the seventh transistor is electrically connected to the second initial signal end; The first end of the eighth transistor is electrically connected to the DC power supply, the second end of the eighth transistor is electrically connected to the control end of the fifth transistor, and the control end of the eighth transistor is electrically connected to the third initial signal end; A first electrode of the third capacitor is electrically connected to the second end of the switch element, and a second electrode of the third capacitor is electrically connected to the third power supply; A first electrode of the fourth capacitor is electrically connected to the second end of the seventh transistor, and a second electrode of the fourth capacitor is electrically connected to the third power supply.

8. A method for driving a pixel circuit, characterized in that: include: When the light is at the end stage, Controlling the first auxiliary light-emitting module and the second auxiliary light-emitting module to be turned on, and the first power supply and the second power supply to supply power to the first end of the switch element; Controlling the switch element to be turned on, so that the first power source and the second power source supply power to the control end of the light emitting module; The light emitting element of the light emitting module is controlled to be turned off.

9. The driving method of the pixel circuit according to claim 8, characterized in that: When in the first initialization stage; Controlling the first regulating element of the first regulating module to be turned on, and the second initial signal end to supply power to the second end of the switch element; When in the second initialization stage; The second regulating element of the first regulating module and the second auxiliary module are controlled to be turned on, the second power supply supplies power to the first end of the switch element, and the second end of the switch element and the control end of the switch element are turned on.

10. A display device, characterized in that: Comprising the pixel circuit as described in any one of claims 1-7.

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