Pixel circuit, driving method thereof, and display device

Abstract

The application provides a pixel circuit and a driving method thereof and a display device, and relates to the field of display technology.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 switching 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 switching element; the first end of the second auxiliary light-emitting module is electrically connected to the second power supply, and the second end of the second auxiliary light-emitting module is electrically connected to the first end of the switching element; the control end of the switching element is electrically connected to a composite signal end, and the second end of the switching element is electrically connected to the control end of the light-emitting module; when being in a light-emitting end stage, the first auxiliary light-emitting module and the control end of the switching element jointly supply power to the switching element.The application solves the problems that the display device is prone to poor brightness uniformity and poor display effect.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to pixel circuits and their driving methods, and display devices. Background Technology

[0002] Organic light-emitting diode (OLED) display devices have the advantages of self-illumination, 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 multiple pixel elements. The pixel circuit is electrically connected to the multiple pixel elements to control the light emission of the pixel elements by adjusting the driving current of the pixel elements. However, in the above-mentioned display device, the light emission time of the multiple pixel elements is inconsistent, which easily leads to poor brightness uniformity and poor display effect. Summary of the Invention

[0004] This application provides pixel circuits and their driving methods, as well as display devices, to solve the problems of poor brightness uniformity and poor display effect in display devices.

[0005] The first aspect of this 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 switching element, and a light-emitting module;

[0006] 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 switching element;

[0007] The first end of the second auxiliary light-emitting module is electrically connected to the second power supply, and the second end of the second auxiliary light-emitting module is electrically connected to the first end of the switching element.

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

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

[0010] By adopting the above technical solution, when the light emission ends, the first auxiliary light emission module and the second auxiliary light emission 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 emission module, so that the first auxiliary light emission module and the control end of the switching element jointly supply power to the switching element, thereby improving the turning-off speed of the switching element, enabling the light emission element of the light emission module to turn off faster, 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 terminal of the first transistor is electrically connected to the first power supply, the second terminal of the first transistor is electrically connected to the first terminal of the second transistor, and the control terminal of the first transistor is electrically connected to the first initialization signal terminal.

[0013] The second terminal of the second transistor is electrically connected to the first terminal of the switching element, and the control terminal of the second transistor is electrically connected to the first terminal of the first capacitor, and the second terminal of the first capacitor is electrically connected to the composite signal terminal.

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

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

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

[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 switching element, and the control end of the first power supply control element is electrically connected to the light emission control signal end; when the composite signal end is in the light emission stage, the second power supply supplies power to the first end of the switching 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 source, the second end of the second power supply control element is electrically connected to the first end of the switching 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, which 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 switching element. 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 switching element, the second end of the second regulating element is electrically connected to the control end of the switching element, and the control end of the second regulating element is electrically connected to the first initialization signal end;

[0023] The first terminal of the second capacitor is electrically connected to the composite signal terminal, and the second terminal of the second capacitor is electrically connected to the control terminal of the switching element.

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

[0025] In some possible implementations, the light-emitting module includes a third power supply, 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 supply, and the control end of the light-emitting control element is electrically connected to the second end of the switching 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 source is greater than the potential of the second power source, and the potential of the second power source is less than the potential of the third power source.

[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 terminal of the fifth transistor is electrically connected to the second terminal of the light-emitting control element, the second terminal of the fifth transistor is electrically connected to the first terminal of the light-emitting element, and the control terminal of the fifth transistor is electrically connected to the data signal terminal.

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

[0031] The first terminal of the third capacitor is electrically connected to the second terminal of the switching element, and the second terminal of the third capacitor is electrically connected to the third power supply.

[0032] The first terminal of the fourth capacitor is electrically connected to the second terminal of the sixth transistor, and the second terminal of the fourth capacitor is electrically connected to the third power supply.

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

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

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

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

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

[0038] The first terminal of the third capacitor is electrically connected to the second terminal of the switching element, and the second terminal of the third capacitor is electrically connected to the third power supply.

[0039] The first terminal of the fourth capacitor is electrically connected to the second terminal of the seventh transistor, and the second terminal of the fourth capacitor is electrically connected to the third power supply.

[0040] A second aspect of this application provides a method for driving a pixel circuit, comprising:

[0041] When it is in the end stage of luminescence

[0042] 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 terminal of the switching element.

[0043] The switching element is turned on, and the first power supply and the second power supply supply power to the control terminal of the light-emitting module.

[0044] The light-emitting element of the light-emitting module is turned off.

[0045] By adopting the above technical solution, when the light emission ends, the first auxiliary light emission module and the second auxiliary light emission 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 emission module, so that the first auxiliary light emission module and the control end of the switching element jointly supply power to the switching element, thereby improving the turning-off speed of the switching element, enabling the light emission element of the light emission module to turn off faster, 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, this occurs during the first initialization phase;

[0047] The first regulating element of the first regulating module is turned on, and the second initial signal terminal supplies power to the second terminal of the switching element;

[0048] When in the second initialization phase;

[0049] The second regulating element and the second auxiliary module of the first regulating module are turned on, the second power supply supplies power to the first terminal of the switching element, and the second terminal of the switching element and the control terminal of the switching element are turned on.

[0050] A third aspect of this application provides a display device including the pixel circuit described above.

[0051] This application provides a display device that includes the pixel circuit described in any of the above claims. Therefore, the display device has the advantages of including the pixel circuit described in any of the above claims, as can be seen in the relevant description above, and will not be repeated here. Attached Figure Description

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

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

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

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

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

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

[0058] Figure 6 A schematic diagram of a pixel circuit according to another embodiment provided in this application;

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

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

[0061] Figure 9 This is a schematic diagram of the PW point potential provided in an embodiment of this application.

[0062] Explanation of reference numerals in the attached figures:

[0063] 100. First auxiliary light-emitting module;

[0064] 110, First transistor; 120, Second transistor; 130, Third transistor; 140, Fourth transistor; 150, First capacitor; 160, Control transistor; 170, Power supply transistor;

[0065] 200. Second auxiliary light-emitting module;

[0066] 210. First power supply control element; 220. Second power supply control element;

[0067] 300. Switching elements;

[0068] 400. Light-emitting module;

[0069] 410. Third power supply; 420. Light-emitting element; 430. Light-emitting control element; 440. Fifth transistor; 450. Sixth transistor; 460. Third capacitor; 470. Fourth capacitor; 480. Seventh transistor; 490. Eighth transistor;

[0070] 500, Adjustment module;

[0071] 510. First adjusting element; 520. Second adjusting element; 530. Second capacitor; 540. Third adjusting element.

[0072] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0073] As described in the background section, a display device includes a pixel circuit and multiple pixel elements. The pixel circuit is electrically connected to the multiple pixel elements to control the light emission of the pixel elements by adjusting the driving current of the pixel elements. However, due to the different arrangement of the multiple pixel elements in the display device, when in the end-of-light emission stage, the light emission time of the light-emitting elements in the multiple pixel elements is inconsistent, which easily leads to poor brightness uniformity and poor display effect of the display device.

[0074] To address the aforementioned technical problems, this application provides a pixel circuit and its driving method, as well as 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 light-emitting end stage, the first and second auxiliary light-emitting modules are turned on, and the first and second power supplies supply power to the first terminal of the switching element. Furthermore, when the switching element is turned on, the first and second power supplies supply power to the control terminal of the light-emitting module, so that the control terminals of the first auxiliary light-emitting module and the switching element jointly supply power to the switching element. This improves the turning-off speed of the switching element, allowing the light-emitting element of the light-emitting module to turn 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 now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

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

[0077] Reference Figures 1-5This application provides a pixel circuit, including a first power supply (VDDF), a second power supply (VDDW), a first auxiliary light-emitting module 100, a second auxiliary light-emitting module 200, a switching element 300 (T2), and a light-emitting module 400. The first terminal of the first auxiliary light-emitting module 100 is electrically connected to the first power supply, and the second terminal of the first auxiliary light-emitting module 100 is electrically connected to the first terminal of the switching element 300 (point N in the figure), so that the first power supply can supply power to the first terminal of the switching element 300 through the first auxiliary light-emitting module 100. The first terminal of the second auxiliary light-emitting module 200 is electrically connected to the second power supply, and the second terminal of the second auxiliary light-emitting module 200 is electrically connected to the first terminal of the switching element 300, so that the second power supply can supply power to the first terminal of the switching element 300 through the first auxiliary light-emitting module 100.

[0078] For example, the control terminal of the switching element 300 is electrically connected to the composite signal terminal (i.e., Sweep / Date t), and the second terminal of the switching element 300 is electrically connected to the control terminal of the light-emitting module 400, thereby controlling the light-emitting module 400 to emit light through the switching element 300; when in the light-emitting end stage, the control terminals of the first auxiliary light-emitting module 100 and the switching element 300 jointly supply power to the switching element 300, which improves the turning-off speed of the switching element 300, enabling the light-emitting element 420 of the light-emitting module 400 to turn 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 embodiments of this application, C1-C4, etc., are all configured as capacitors, and each of the capacitors C1-C4, etc., has two relatively parallel electrodes; wherein, in the embodiments of this application, the first electrode of the capacitor is configured as one of the two electrodes, and the second electrode of the capacitor is configured as the other of the two electrodes.

[0080] T1-T16, etc., are all transistors, and each transistor has a source, a gate, and a drain. In this embodiment, the first terminal of the transistor is set as one of the source and the drain, the second terminal of the transistor is set as the other of the source and the drain, the control terminal of the transistor is set 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; 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 (i.e., T12), a second transistor 120 (i.e., T4), a third transistor 130 (i.e., T11), a fourth transistor 140 (i.e., T9), a power supply transistor 170 (i.e., T18), and a first capacitor 150 (i.e., C2).

[0082] The first terminal of the first transistor 110 is electrically connected to the first power supply, the second terminal of the first transistor 110 is electrically connected to the first terminal of the second transistor 120, and the control terminal of the first transistor 110 is electrically connected to the first initialization signal terminal (i.e., Gn).

[0083] The second terminal of the second transistor 120 is electrically connected to the first terminal of the switching element 300, and the control terminal of the second transistor 120 is electrically connected to the first pole of the first capacitor 150, and the second pole of the first capacitor 150 is electrically connected to the composite signal terminal.

[0084] The first terminal of the third transistor 130 is electrically connected to the second terminal of the second transistor 120. The second terminal of the third transistor 130 is electrically connected to the control terminal of the second transistor 120 and the first terminal of the first capacitor 150. The control terminal of the third transistor 130 is electrically connected to the first initialization signal terminal.

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

[0086] The first terminal of the power supply transistor 170 is electrically connected to the first power supply, the second terminal of the power supply transistor 170 is electrically connected to the first terminal of the second transistor 120, and the control terminal of the power supply transistor 170 is electrically connected to the light emission control signal terminal (i.e., EM2).

[0087] For example, the first auxiliary light-emitting module 100 further 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 conducting state, the second terminal of the second transistor 120 and the control terminal of the second transistor 120 are connected, 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 and the conduction voltage of the second transistor 120 (i.e., Vth4) (i.e., VM = VDDF + Vth4).

[0089] Reference Figure 1 and Figure 3 For example, the second auxiliary light-emitting module 200 includes a first power supply control element 210 (i.e., T14) and a second power supply control element 220 (i.e., 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 switching element 300, and the control end of the first power supply control element 210 is electrically connected to the light emission control signal end. When the composite signal end is in the light emission stage, the second power supply supplies power to the first end of the switching element 300 through the first power supply control element 210.

[0091] The first end of the second power supply control element 220 is electrically connected to the second power supply, the second end of the second power supply control element 220 is electrically connected to the first end of the switching element 300, and the 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 also includes an adjustment module 500, which includes a first adjustment element 510 (i.e., T8), a second adjustment element 520 (i.e., T10), and a second capacitor 530 (i.e., C1).

[0093] Wherein, 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 switching 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 adjustment module 500 also includes a third adjustment element 540 (i.e., T7). The first end of the third adjustment element 540 is electrically connected to a DC power supply (i.e., Vinit1), the second end of the third adjustment element 540 is electrically connected to the control end of the switching element 300 and the second end of the second adjustment element 520, and the control end of the third adjustment 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 adjustment element 520 is in the conducting state, the second terminal of the switching element 300 is connected to the control terminal of the switching element 300, the switching element 300 is diode-ized, and the adjustment module 500 can compensate the potential of the control terminal of the switching element 300 (i.e., point S in the figure), so that the potential of the control terminal of the switching element 300 is equal to the sum of the potential of the second power supply and the conduction voltage of the switching element 300 (i.e., Vth2) (i.e., VS=VDDW+Vth2).

[0097] For example, the potential of the first power supply can be greater than the potential of the second power supply, i.e., VDDF > VDDW, thereby reducing the gate-source voltage difference of the switching element 300. This allows the gate-source voltage difference of the switching element 300 to be set as: VGS = VDDW + Vth2 - VDDF, making the switching element 300 turn on more fully. This further reduces the possibility of poor brightness uniformity in the display device and improves the display effect of the display device.

[0098] The following is in conjunction with the appendix Figure 1 and Figure 5 The structure of the light-emitting module 400 is described, for example, the light-emitting module 400 includes a third power supply 410 (i.e., VDDA), a light-emitting element 420 (i.e., T5) and a light-emitting control element 430 (i.e., T3).

[0099] The first end of the light-emitting control element 430 is electrically connected to the third power supply 410, the control end of the light-emitting control element 430 (i.e., point PW in the figure) is electrically connected to the second end of the switching element 300; and the second end of the light-emitting control element 430 is electrically connected to the light-emitting element 420, the control end of the light-emitting element 420 is connected to the light-emitting signal control end (i.e., EM1), so as to control the light-emitting element 420 through the light-emitting control element 430.

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

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

[0102] The first terminal of the fifth transistor 440 is electrically connected to the second terminal of the light-emitting control element 430, the second terminal of the fifth transistor 440 is electrically connected to the first terminal of the light-emitting element 420, and the control terminal of the fifth transistor 440 is electrically connected to the data signal terminal (i.e., Date I).

[0103] The first terminal of the sixth transistor 450 is electrically connected to the data signal terminal, the second terminal of the sixth transistor 450 is electrically connected to the control terminal of the fifth transistor 440, and the control terminal of the sixth transistor 450 is electrically connected to the second initial signal terminal.

[0104] The first terminal of the third capacitor 460 is electrically connected to the second terminal of the switching element 300, and the second terminal of the third capacitor 460 is electrically connected to the third power supply 410; the first terminal of the fourth capacitor 470 is electrically connected to the second terminal of the sixth transistor 450, and the second terminal 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 also include a fifth transistor 440 (i.e., T1), a sixth transistor 450 (i.e., T6), a seventh transistor 480 (i.e., T16), an eighth transistor 490 (i.e., T17), a third capacitor 460 (i.e., C3), and a fourth capacitor 470 (i.e., C4).

[0106] The first terminal of the fifth transistor 440 is electrically connected to the second terminal of the light-emitting control element 430, the second terminal of the fifth transistor 440 is electrically connected to the first terminal of the light-emitting element 420, and the control terminal of the fifth transistor 440 is electrically connected to the DC power supply (i.e., Vinit2).

[0107] The first terminal of the sixth transistor 450 is electrically connected to the data signal terminal (i.e., Date I), the second terminal of the sixth transistor 450 is electrically connected to the first terminal of the fifth transistor 440, and the control terminal of the sixth transistor 450 is electrically connected to the second initial signal terminal.

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

[0109] The first terminal of the eighth transistor 490 is electrically connected to the DC power supply (i.e., Vinit2), the second terminal of the eighth transistor 490 is electrically connected to the control terminal of the fifth transistor 440, and the control terminal of the eighth transistor 490 is electrically connected to the third initial signal terminal (i.e., Gn-2).

[0110] The first terminal of the third capacitor 460 is electrically connected to the second terminal of the switching element 300, and the second terminal of the third capacitor 460 is electrically connected to the third power supply 410; the first terminal of the fourth capacitor 470 is electrically connected to the second terminal of the seventh transistor 480, and the second terminal of the fourth capacitor 470 is electrically connected to the third power supply 410.

[0111] In summary, during the end-of-light-emitting 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 terminal of the switching element 300. Furthermore, the switching 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. This allows the control terminals of the first auxiliary light-emitting module 100 and the switching element 300 to jointly supply power to the switching element 300, thereby increasing the turning-off speed of the switching element 300. This enables the light-emitting element 420 of the light-emitting module 400 to turn off more quickly, 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 this application provides a driving method for a pixel circuit, comprising: when in the end-of-light-emitting stage, 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 supplying power to the first terminal of the switching element 300; controlling the switching element 300 to be turned on, and the first power supply and the second power supply supplying power to the control terminal 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 phase, the first adjustment element 510 controlling the first adjustment module 500 is turned on, and the second initial signal terminal supplies power to the second terminal of the switching element 300;

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

[0115] The following is in conjunction with the appendix Figure 1 and Figure 8 The driving method for the pixel circuit is described, wherein the operation of the pixel circuit includes an initialization phase (i.e., time t1-t2), a data writing phase (i.e., time t3), a light emission preparation phase (i.e., time t4-t6), a light emission phase (i.e., part of time t7), and a light emission termination phase (i.e., the remainder of time t7). The initialization phase includes a first initialization phase (i.e., time t1) and a second initialization phase (i.e., time t2). 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) emit low-level signals, the sixth transistor 450 (i.e., T6), the first adjustment 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) is written with 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 conducting 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-enabled, 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 conduction voltage of the second transistor 120 (i.e., Vth4) (i.e., VM = VDDF + Vth4).

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

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

[0120] At time t4, the signal emitted 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 the 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. PW point in the figure) is at a low potential.

[0122] At time t6, the light emission control signal terminal (i.e., EM2) emits a low-level signal, and the signal potential emitted by the composite signal terminal gradually decreases, thus preparing for the light emission of the light-emitting element 420.

[0123] At time t7, the light emission signal control terminal (i.e., EM1) emits a low-level signal, and the light emission element 420 emits light. When the light emission ends, the first auxiliary light emission module 100 and the second auxiliary light emission module 200 are turned on, and the first power supply and the second power supply supply power to the first terminal of the switching element 300. Furthermore, the switching element 300 is turned on, and the first power supply and the second power supply supply power to the control terminal of the light emission module 400, so that the control terminals of the first auxiliary light emission module 100 and the switching element 300 jointly supply power to the switching element 300, thereby improving the turning-off speed of the switching element 300.

[0124] exist Figure 8 During the light emission end stage, i.e. at time t7, the first auxiliary light emission module 100 and the second auxiliary light emission module 200 are turned on, and the first power supply and the second power supply supply power to the first terminal (i.e., point N) of the switching element 300, thereby rapidly increasing the potential of the first terminal of the switching element 300 and improving the turn-on speed of the switching element 300.

[0125] Figure 9 This is a schematic diagram of the PW point potential provided in an embodiment of this application, wherein line a is a potential change line of the PW point under ideal conditions, line b is a potential change line of the PW point in related technologies, and line c is a potential change line of the PW point in the pixel circuit provided in an embodiment of this application; as shown Figure 9 As shown, when in the light emission end stage, compared with the pixel circuit in the related technology, the pixel circuit provided in this application embodiment can quickly increase the potential of the PW point, improve the turning-off speed of the switching element, and enable the light emission element of the light emission module to turn off faster.

[0126] This application also provides a display device including the pixel circuit described above.

[0127] This application provides a display device that includes the pixel circuit described in any of the above embodiments. Therefore, the display device has the advantages of the pixel circuit described in any of the above embodiments, which can be specifically referred to in the relevant description above, and will not be repeated here.

[0128] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0129] In the description of this invention, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or elements is not necessarily limited to those steps or elements that are explicitly listed, but may include other steps or elements that are not explicitly listed or that are inherent to such process, method, product, or device.

[0130] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 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; 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 switching element; The first end of the second auxiliary light-emitting module is electrically connected to the second power supply, and the second end of the second auxiliary light-emitting module is electrically connected to the first end of the switching element. The control terminal of the switching element is electrically connected to the composite signal terminal, and the second terminal of the switching element is electrically connected to the control terminal of the light-emitting module; When the light emission ends, the control terminals of the first auxiliary light emission module and the switching element jointly supply power to the switching element. 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 terminal of the first transistor is electrically connected to the first power supply, the second terminal of the first transistor is electrically connected to the first terminal of the second transistor, and the control terminal of the first transistor is electrically connected to the first initialization signal terminal. The second terminal of the second transistor is electrically connected to the first terminal of the switching element, and the control terminal of the second transistor is electrically connected to the first terminal of the first capacitor, and the second terminal of the first capacitor is electrically connected to the composite signal terminal. The first terminal of the third transistor is electrically connected to the second terminal of the second transistor, the second terminal of the third transistor is electrically connected to the control terminal of the second transistor and the first terminal of the first capacitor, and the control terminal of the third transistor is electrically connected to the first initialization signal terminal. The first terminal of the fourth transistor is electrically connected to a DC power supply, the second terminal of the fourth transistor is electrically connected to the control terminal of the second transistor, and the control terminal of the fourth transistor is electrically connected to the second initialization signal terminal. The first terminal of the power supply transistor is electrically connected to the first power source, the second terminal of the power supply transistor is electrically connected to the first terminal of the second transistor, and the control terminal of the power supply transistor is electrically connected to the light emission control signal terminal. 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 switching element, and the control end of the first power supply control element is electrically connected to the light emission control signal end; when the composite signal end is in the light emission stage, the second power supply supplies power to the first end of the switching 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 source, the second end of the second power supply control element is electrically connected to the first end of the switching element, and the control end of the second power supply control element is electrically connected to the first initialization signal end.

2. The pixel circuit according to claim 1, characterized in that, The pixel circuit also includes an adjustment module, which 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 switching element. 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 switching element, the second end of the second regulating element is electrically connected to the control end of the switching element, and the control end of the second regulating element is electrically connected to the first initialization signal end; The first terminal of the second capacitor is electrically connected to the composite signal terminal, and the second terminal of the second capacitor is electrically connected to the control terminal of the switching element.

3. The pixel circuit according to claim 1 or 2, characterized in that, The potential of the first power source is greater than the potential of the second power source.

4. The pixel circuit according to claim 1, characterized in that, The light-emitting module includes a third power supply, 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 supply, and the control end of the light-emitting control element is electrically connected to the second end of the switching 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; The potential of the first power source is greater than the potential of the second power source, and the potential of the second power source is less than the potential of the third power source.

5. The pixel circuit according to claim 4, characterized in that, The pixel circuit also includes a fifth transistor, a sixth transistor, a third capacitor, and a fourth capacitor; The first terminal of the fifth transistor is electrically connected to the second terminal of the light-emitting control element, the second terminal of the fifth transistor is electrically connected to the first terminal of the light-emitting element, and the control terminal of the fifth transistor is electrically connected to the data signal terminal. The first terminal of the sixth transistor is electrically connected to the data signal terminal, the second terminal of the sixth transistor is electrically connected to the control terminal of the fifth transistor, and the control terminal of the sixth transistor is electrically connected to the second initial signal terminal. The first terminal of the third capacitor is electrically connected to the second terminal of the switching element, and the second terminal of the third capacitor is electrically connected to the third power supply. The first terminal of the fourth capacitor is electrically connected to the second terminal of the sixth transistor, and the second terminal of the fourth capacitor is electrically connected to the third power supply. Alternatively, the pixel circuit may further include a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a third capacitor, and a fourth capacitor; The first terminal of the fifth transistor is electrically connected to the second terminal of the light-emitting control element, the second terminal of the fifth transistor is electrically connected to the first terminal of the light-emitting element, and the control terminal of the fifth transistor is electrically connected to a DC power supply. The first terminal of the sixth transistor is electrically connected to the data signal terminal, the second terminal of the sixth transistor is electrically connected to the first terminal of the fifth transistor, and the control terminal of the sixth transistor is electrically connected to the second initial signal terminal. The first terminal of the seventh transistor is electrically connected to the control terminal of the fifth transistor, the second terminal of the seventh transistor is electrically connected to the second terminal of the fifth transistor, and the control terminal of the seventh transistor is electrically connected to the second initial signal terminal. The first terminal of the eighth transistor is electrically connected to the DC power supply, the second terminal of the eighth transistor is electrically connected to the control terminal of the fifth transistor, and the control terminal of the eighth transistor is electrically connected to the third initial signal terminal. The first terminal of the third capacitor is electrically connected to the second terminal of the switching element, and the second terminal of the third capacitor is electrically connected to the third power supply. The first terminal of the fourth capacitor is electrically connected to the second terminal of the seventh transistor, and the second terminal of the fourth capacitor is electrically connected to the third power supply.

6. A driving method for a pixel circuit, applied to the pixel circuit according to any one of claims 1-5, characterized in that, include: When it is in the end stage of luminescence 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 terminal of the switching element. The switching element is turned on, and the first power supply and the second power supply supply power to the control terminal of the light-emitting module. The light-emitting element of the light-emitting module is turned off.

7. The driving method for the pixel circuit according to claim 6, characterized in that, When in the first initialization phase; The first regulating element of the first regulating module is turned on, and the second initial signal terminal supplies power to the second terminal of the switching element; When in the second initialization phase; The second regulating element and the second auxiliary module of the first regulating module are turned on, the second power supply supplies power to the first terminal of the switching element, and the second terminal of the switching element and the control terminal of the switching element are turned on.

8. A display device, characterized in that, Includes the pixel circuit as described in any one of claims 1-5.

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