Display panel and display device

Abstract

The embodiment of the invention provides a display panel and a display device. The display panel comprises a plurality of pixel circuits. The pixel circuit comprises a driving transistor, a first light emitting control module and a first node. The first light-emitting control module is electrically connected with the light-emitting device, the first electrode of the first light-emitting control module is electrically connected with the driving transistor, the second electrode is electrically connected with the light-emitting device, and the control end is electrically connected with the light-emitting control signal line. The first node is located between the second pole of the first light-emitting control module and the light-emitting device. The pixel circuit further comprises an anti-coupling module, the first pole of the anti-coupling module is electrically connected with the first node, the second pole of the anti-coupling module is electrically connected with the first electric signal, the anti-coupling module and the first node can be conducted, and the path where the anti-coupling module is located is prevented from being suspended. The anti-coupling module can be used for storing or releasing charges, and when the potential of the first node is raised by coupling, the anti-coupling module can absorb redundant charges from the first node, so that the potential of the first node is stabilized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0002] In the application of display panel, the display panel includes pixel circuit, the pixel circuit can be used to generate light emitting driving current to drive light emitting device to emit light. With the increasing demand of market for display panel, the refresh frequency of display panel is gradually increased. In this case, the number of jumps of light emitting control signal output to pixel circuit to drive pixel circuit to generate light emitting driving current is increased. However, with the jump of light emitting control signal, the jump of light emitting control signal will produce coupling effect between some nodes adjacent to the pixel circuit. The more the number of coupling is, the higher the node potential of coupling is pulled up, and the instability of node potential is easy to cause the instability of circuit work and the accuracy of output signal. SUMMARY

[0003] Therefore, the present application provides a display panel and a display device to solve the above problems.

[0004] In a first aspect, the present application provides a display panel, the display panel comprising a plurality of pixel circuits. The pixel circuit comprises: a driving transistor, the driving transistor being configured to generate a light emitting driving current to drive a light emitting device to emit light; a first light emitting control module, the first light emitting control module being electrically connected with the light emitting device, a first electrode of the first light emitting control module being electrically connected with the driving transistor, a second electrode of the first light emitting control module being electrically connected with the light emitting device, and a control terminal of the first light emitting control module being electrically connected with a light emitting control signal line, a light emitting control signal transmitted by the light emitting control signal line being switched between high and low levels; a first node, the first node being located between the second electrode of the first light emitting control module and the light emitting device; wherein the pixel circuit further comprises an anti-coupling module, a first electrode of the anti-coupling module being electrically connected with the first node, and a second electrode of the anti-coupling module being electrically connected with a first electrical signal.

[0005] In a second aspect, the present application provides a display device comprising the display panel provided in the first aspect.

[0006] In the embodiment of the present application, the pixel circuit further comprises an anti-coupling module, a first pole of the anti-coupling module is electrically connected with the first node, and a second pole of the anti-coupling module is electrically connected with the first electrical signal, which is conducive to making the anti-coupling module and the first node conductive, and avoiding the anti-coupling module being suspended. The anti-coupling module can be used to store or release charges. When the potential of the first node is coupled to be raised, the anti-coupling module can absorb the excess charges from the first node, thereby stabilizing the potential of the first node. When the light-emitting control signal EM jumps from a low level to a high level, because the first node is electrically connected with the anti-coupling module, the potential of the first node will not be easily coupled to be raised, the potential stability of the first node is improved, the signal noise can be effectively reduced, thereby being conducive to ensuring the accuracy of the light-emitting driving current flowing to the light-emitting device and ensuring the display effect. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0008] Figure 1 A schematic diagram of a pixel circuit provided by the present application is shown in the figure. Figure 2 A schematic diagram of a light-emitting control signal provided by the present application is shown in the figure. Figure 3 A working timing diagram provided by the present application is shown in the figure. Figure 4 A schematic diagram of another pixel circuit provided by the present application is shown in the figure. Figure 5 A schematic diagram of a display panel provided by the present application is shown in the figure. Figure 6 A schematic diagram of a first shift register circuit provided by the present application is shown in the figure. Figure 7 A schematic diagram of a display device provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0009] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0010] It should be clear that the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor, including the new embodiments obtained by combining the various embodiments mentioned in the present application in the absence of technical conflicts, belong to the scope of protection of the present application.

[0011] The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the application and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0012] It should be understood that the term "and / or" used herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0013] In the description of the specification, it should be understood that the words "substantially", "approximately", "about", "approximately", "approximately", "approximately", "approximately" and the like described in the claims and embodiments of the application mean that they can be generally recognized within a reasonable process operation range or tolerance range, rather than an exact value.

[0014] It should be understood that although the terms first, second, etc. may be used in the embodiments of the application to describe poles, times, working modes, etc., these should not be limited to these terms. These terms are only used to distinguish poles, times, working modes, etc. from each other. For example, without departing from the scope of the embodiments of the application, the first pole can also be called the second pole, and similarly, the second pole can also be called the first pole. The present applicant provides a solution to the problems existing in the prior art through careful and in-depth research.

[0015] Figure 1 A schematic diagram of a pixel circuit provided by the present application is shown in Figure 2 A schematic diagram of a light emitting control signal provided by the present application is shown in

[0016] The present application provides a display panel 100, which comprises a plurality of pixel circuits 200. As Figure 1 shown, the pixel circuit 200 comprises: A driving transistor Md, which is used to generate a light emitting driving current to drive the light emitting device 300 to emit light.

[0017] A first light emitting control module 10, which is electrically connected with the light emitting device 300, the first pole of the first light emitting control module 10 is electrically connected with the driving transistor Md, the second pole is electrically connected with the light emitting device 300, and the control end is electrically connected with the light emitting control signal line SEM. In combination with Figure 2 shown, the light emitting control signal EM transmitted by the light emitting control signal line SEM is switched between high and low levels. As Figure 2As shown, the light-emitting control signal EM is switched between a high-level signal VGH and a low-level signal VGL.

[0018] The first node N1 is located between the second pole of the first light-emitting control module 10 and the light-emitting device 300. The light-emitting driving current flows to the light-emitting device 300 through the first node N1. The first node N1 is electrically connected to the first pole of the light-emitting device 300, and the potential of the first node N1 affects the luminance of the light-emitting device 300.

[0019] The light-emitting control signal line SEM is electrically connected to the control end of the first light-emitting control module 10, and the first node is electrically connected to the second pole of the first light-emitting control module 10. The control end of the first light-emitting control module 10 is structured as the light-emitting control signal EM. Therefore, the distance between the light-emitting control signal line SEM and the first node N1 is short, and when the light-emitting control signal EM transmitted on the light-emitting control signal line SEM is switched between high and low levels, it is easy to form coupling between the first node N1. Especially when the light-emitting control signal EM jumps from low to high, the light-emitting control signal EM will couple the potential of the first node N1 to rise. As the refresh frequency of the display panel 100 increases, the frequency of the light-emitting control signal EM switching between high and low levels will also increase, which can also be called an increase in the number of pulses of the light-emitting control signal EM. Therefore, in the process of using the display panel 100, the greater the number of pulses of the light-emitting control signal EM, the greater the potential of the first node N1 is raised. The instability of the potential of the first node N1 can easily cause the accuracy of the light-emitting driving current received by the light-emitting device 300, which is not conducive to the accurate light-emitting of the light-emitting device 300. Especially when the light-emitting device 300 displays in low gray scale, the light-emitting driving current required by the light-emitting device 300 is already small, and if the potential of the first node N1 is coupled to rise, the impact on the luminance of the light-emitting device 300 is very obvious.

[0020] In the display panel 100, the high level signal VGH of the emission control signal EM can be transmitted by a high level signal line. The high level signal line VGH can be electrically connected to a plurality of pixel circuits 200 arranged along the first direction X1 at the same time. The first direction X1 can be the vertical direction. The high level signal line VGH itself has a voltage drop. When the high level signal line VGH transmits the high level signal VGH from top to bottom or from bottom to top in the vertical direction, the potential of the high level signal VGH output from different positions of the high level signal line VGH can have some differences. This can cause the potentials of the high level signals received by the plurality of pixel circuits 200 along the first direction X1 to be inconsistent. When the emission control signal EM jumps from the low level to the high level, the potentials of the high level signals to which the emission control signal EM jumps are also inconsistent. This further causes the jump amounts of the emission control signal EM in the plurality of pixel circuits 200 arranged along the first direction X1 to be different, so that the coupling amounts between the emission control signal EM and the first node N1 in the plurality of pixel circuits 200 arranged along the first direction X1 are different. The influence on the potential of the first node N1 in the plurality of pixel circuits 200 is also different, which affects the uniformity of the light emission of the plurality of light emitting devices 300 in the display panel 100.

[0021] Therefore, in the embodiments of the present application, continuing to refer to Figure 1 to avoid the influence of the jump of the emission control signal EM on the coupling of the first node N1, the pixel circuit 200 further includes an anti-coupling module 20. The first electrode of the anti-coupling module 20 is electrically connected to the first node N1, and the second electrode is electrically connected to the first signal V1, which is conducive to the conduction between the anti-coupling module 20 and the first node N1, and avoids the anti-coupling module 20 being suspended. The anti-coupling module 20 can store or release charges. When the potential of the first node N1 is coupled to be raised, the anti-coupling module 20 can absorb the excess charges from the first node N1, so as to stabilize the potential of the first node N1. When the emission control signal EM jumps from the low level to the high level, since the first node N1 is electrically connected to the anti-coupling module 20, the potential of the first node N1 will not be easily coupled to be raised, which improves the potential stability of the first node N1, can effectively reduce the signal noise, so as to be conducive to ensuring the accuracy of the light emission driving current flowing to the light emitting device 300, and ensuring the display effect.

[0022] Figure 3 A working timing diagram is provided in the present application.

[0023] In an embodiment of the present application, as shown in Figure 3 In the stage of converting the emission control signal EM from the low level to the high level, the anti-coupling module 20 is turned on. In combination with Figure 1The pixel circuit 200 is shown to be in a state that the first light emitting control module 10 is closed when the light emitting control signal EM transmits a high level signal, and the first light emitting control module 10 is opened when the light emitting control signal EM transmits a low level signal. Then, when the first light emitting control module 10 is closed, the transmission of the light emitting driving current to the light emitting device 300 is stopped, at this time, the influence of the coupling of the high level signal of the light emitting control signal EM on the potential of the first node N1 needs to be resisted, and the potential of the first node N1 needs to be stabilized, so as to ensure the stability of the brightness of the light emitting device 300 and the accuracy of the light emitting driving current received by the light emitting device 300 when the first light emitting control module 10 is opened.

[0024] When the first light emitting control module 10 is opened, the light emitting control signal EM at this time is switched from high level to low level, and the light emitting device 300 needs to receive the light emitting driving current. However, when the light emitting control signal EM is switched from low level to high level, the potential of the first node N1 is at risk of being coupled to rise, and the opening of the anti-coupling module 20 has reduced the degree of the potential of the first node N1 being coupled to rise. Therefore, when the light emitting control signal EM is switched from high level to low level, the accuracy of the light emitting driving current received by the light emitting device 300 can be ensured.

[0025] In addition, since the anti-coupling module 20 is electrically connected to the first node N1, the first node N1 is a point of the way of the light emitting driving current flowing to the light emitting device, and opening other load modules in the transmission path of the light emitting driving current is easy to cause shunt. Therefore, the anti-coupling module 20 is set to be opened only in the stage of switching from low level to high level, for resisting the coupling effect brought by the jump of the light emitting control signal EM from low level to high level, instead of being opened in the whole stage of the opening of the first light emitting control module 10. This is conducive to ensuring the anti-coupling effect of the anti-coupling module 20, and avoiding the influence of the anti-coupling module 20 on the shunt of the light emitting driving current. Exemplarily, as shown in Figure 3 It is shown that the anti-coupling module 20 is opened when receiving a low level signal VGL, and the anti-coupling module 20 is closed when receiving a high level signal VGH.

[0026] In an embodiment of the present application, continuing to refer to Figure 3 It is shown that the first light emitting control module 10 is opened when the light emitting control signal line SEM transmits a low level signal. That is, the low level signal included in the light emitting control signal EM is the effective control signal of the first light emitting control module 10, at this time, the first light emitting control module 10 is opened, and the light emitting driving current is transmitted to the first electrode 3001 of the light emitting device 300.

[0027] In the working period of the pixel circuit 200, it includes: In the non-light emitting stage E1, the light emitting control signal line SEM transmits a high level signal VGH. At this time, the first light emitting control module 10 is closed, and the first light emitting control module 10 stops transmitting the light emitting driving current to the light emitting device 300.

[0028] In the light emitting stage E2, the light emitting control signal line SEM transmits a low level signal VGL. At this time, the first light emitting control module 10 is opened, and the first light emitting control module 10 transmits the light emitting driving current to the light emitting device 300.

[0029] The anti-coupling stage E3 starts before the start time of the non-light emitting stage E2 and ends before the start time of the light emitting stage E2. In the embodiment of the present application, continuing to refer to the pixel circuit 200 shown in FIG. 2, the anti-coupling stage E3 is the stage in which the anti-coupling module 20 receives the low level signal, and the stage in which the anti-coupling module 20 receives the high level signal is the stage in which the anti-coupling module 20 is closed. Figure 3

[0030] The non-light emitting stage E1 is the stage in which the light emitting control signal EM is at the high level signal VGH, and thus the light emitting control signal EM needs to jump from the low level signal VGL to the high level signal VGH when entering the non-light emitting stage E1. The above jump is the cause of the coupling to raise the potential of the first node N1. Therefore, the anti-coupling module 20 needs to be opened before the pixel circuit 200 enters the non-light emitting stage E2, so that the anti-coupling stage E3 starts at the start time of the non-light emitting stage E1, that is, the time when the light emitting control signal EM jumps from the low level signal VGL to the high level signal VGH, and the anti-coupling module 20 plays a stabilizing role on the potential of the first node N1. At the start time of the light emitting stage E2, the light emitting control signal EM needs to jump from the high level signal VGH to the low level signal VGL, and at this time, the jump causes less influence on the potential of the first node N1. Moreover, at the light emitting stage E2, the light emitting device 300 needs to receive the light emitting driving current, and in order to avoid the anti-coupling module 20 electrically connected to the first node N1 from causing a shunt effect on the light emitting driving current, the anti-coupling stage E3 ends before the start of the light emitting stage E2, so that the anti-coupling module 20 is closed.

[0031] In an embodiment of the present application, continuing to refer to the pixel circuit 200 shown in FIG. 2, the start time of the anti-coupling stage E3 is different from the start time of the non-light emitting stage E1 by a first time t1, and the end time of the anti-coupling stage E3 is different from the start time of the light emitting stage E2 by a second time t2. Figure 3

[0032] ​​In the embodiment of the present application, the opening time of the anti-coupling stage E3 is controlled so that the first time t1 is greater than the time for the light emitting stage E2 to switch to the non-light emitting stage E1, and the second time t2 is greater than the time for the non-light emitting stage E1 to switch to the light emitting stage E2, which is beneficial to ensure that the anti-coupling module 20 remains open during the process of the light emitting control signal EM jumping from the low-level signal VGL to the high-level signal VGH, and is beneficial to ensure that the anti-coupling module 20 is closed during the process of the light emitting control signal EM jumping from the high-level signal VGH to the low-level signal VGL, thereby ensuring the reliability of the anti-coupling module 20 in stabilizing the potential of the first node N1, and avoiding the anti-coupling module 20 from affecting the light emitting driving current.

[0033] Figure 4 Another schematic diagram of a pixel circuit is provided in the present application.

[0034] In one embodiment of the present application, as shown in Figure 4 the anti-coupling module 20 includes a first switch K1 and a first capacitor C1, the first pole of the first switch K1 is electrically connected with the first node N1, and the second pole is electrically connected with the first capacitor C1. The first switch K1 can be used to control whether the first node N1 and the first capacitor C1 can be turned on. One plate of the first capacitor C1 is electrically connected with the second pole of the first switch K1, and the other plate is electrically connected with the first electrical signal V1.

[0035] When the first capacitor C1 is turned on with the first node N1, since the first capacitor C1 has the ability to store and release charges, which helps to smooth the potential fluctuation of the first node N1, thereby maintaining the stability of the potential of the first node N1. Specifically, when the first node N1 has a transient drop due to coupling or other reasons, at this time the first capacitor C1 can release the stored charges to supplement the position of the first node N1, so as to maintain the stability of the potential of the first node N1. Then, we are more concerned that when the potential of the first node N1 is raised, it means that there is an additional charge injection at the first node N1, and then the first capacitor C1 electrically connected with the first node N1 will absorb these excess charges, thereby preventing the potential of the first node N1 from being raised.

[0036] For example, in combination with the timing diagram shown in Figure 3 the first switch K1 receives a signal to open before the light emitting control signal EM received by the first light emitting control module 10 is switched from the low-level signal VGL to the high-level signal VGH. Thus, the first capacitor C1 is turned on with the first node N1, that is, the anti-coupling module 20 is opened. The first switch K1 receives a signal to close before the light emitting control signal EM is switched from the high-level VGH to the low-level VGL. Thus, the first capacitor C1 is not turned on with the first node N1, that is, the anti-coupling module 20 is closed.

[0037] Figure 5 A schematic diagram of a display panel is provided in the present application, Figure 6 A schematic diagram of a first shift register circuit is provided in the present application.

[0038] In an embodiment of the present application, as shown in Figure 5 The display panel 100 includes a plurality of first shift register circuits 40 cascaded along a first direction X1, and outputs of the plurality of first shift register circuits 40 are respectively electrically connected to a plurality of light-emitting control signal lines SEM arranged along the first direction X1. In combination with Figure 1 The first shift register circuit 40 can be used to provide a light-emitting control signal EM for the pixel circuit 200, which is transmitted by the light-emitting control signal line SEM.

[0039] The display panel 100 further includes a plurality of pixel rows 2001 arranged along the first direction X1, and each pixel row 2001 includes a plurality of pixel circuits 200 arranged along a second direction X2, and the first direction X1 and the second direction X2 are both parallel to a plane on which the display panel 100 is located. At least part of the pixel circuits 200 in the same pixel row 2001 are electrically connected to the same light-emitting control signal line SEM.

[0040] Exemplarily, in combination with Figure 6 The first shift register circuit 40 includes a gating module 401 and a driving control module 402, and the gating module 401 includes a first gating transistor 401A and a second gating transistor 401B. The first electrode of the first gating transistor 401A receives a high-level signal VGH, the second electrode is electrically connected to the output of the first shift register circuit 40, and the gate electrode is electrically connected to the driving control module 402. The first electrode of the second gating transistor 401B receives a low-level signal VGL, the second electrode is electrically connected to the output of the first shift register circuit 40, and the gate electrode is electrically connected to the driving control module 402. The first gating transistor 401A and the second gating transistor 401B output the high-level signal VGH and the low-level signal VGL respectively, and the driving control module 402 can be used to control one of the first gating transistor 401A and the second gating transistor 401B to be closed and the other to be turned on, so that the output of the first shift register circuit 40 outputs the high-level signal VGH or the low-level signal VGL at different times. The signal output by the first shift register circuit 40 is the light-emitting control signal EM which switches between high and low levels.

[0041] The first shift register circuit 40 is electrically connected with the same first power voltage signal line SVGH for transmitting the high level signal VGH. The high level signal VGH received by the first gating transistor 401A in the first shift register circuit 40 can be provided by the first power voltage signal line SVGH. In this way, the first electrode of the first gating transistor 401A in the plurality of cascaded first shift register circuits 40 can be electrically connected with the same first power voltage signal line SVGH, which is beneficial to save the number of first power voltage signal lines SVGH.

[0042] However, in combination with the above, the first power voltage signal line SVGH extending along the first direction X1 itself has a certain voltage drop. When the first power voltage signal line SVGH transmits the high level signal VGH from top to bottom or from bottom to top in the vertical direction, the potential of the high level signal VGH output from different positions of the high level signal line VGH can have some differences. This will make the potential of the high level signal received by the plurality of pixel circuits 200 in the first direction X1 not completely consistent. When the light emitting control signal EM jumps from low level to high level, the potential of the jump to high level signal is also not consistent. This further leads to the fact that the jump amount of the light emitting control signal EM in the pixel circuit 200 in the plurality of pixel rows 2001 arranged in the first direction X1 is different, so that the coupling amount between the light emitting control signal EM received in the plurality of pixel circuits 200 arranged in the first direction X1 and the first node N1 is different when the light emitting control signal EM jumps. That is, the degree of coupling generated by the jump of the light emitting control signal EM in the pixel circuit 200 in different pixel rows 2001 to the first node N1 is different. Then, when the anti-coupling module 20 is electrically connected with the first node N1 for anti-coupling and stabilizing the potential, the anti-coupling ability of the anti-coupling module 20 in the pixel circuit 200 in different pixel rows 2001 also needs to be designed differently.

[0043] In an embodiment of the present application, the capacitance of the first capacitor C1 in the plurality of pixel circuits 200 arranged in the first direction X1 is different. The different capacitance of the first capacitor C1 represents the different ability of the first capacitor C1 to store and release charges, and the different threshold value. The capacitance of the first capacitor C1 is an indicator of the anti-coupling ability of the anti-coupling module 20.

[0044] Therefore, in the embodiment of the present application, the capacitance of the first capacitor C1 in the anti-coupling module 20 in the plurality of pixel circuits 200 arranged along the first direction X1 is different, which is beneficial to overcome the influence of the wiring voltage drop of the first power voltage signal line SVGH, flexibly adjust the anti-coupling capability of the anti-coupling module 20 in different pixel rows 2001, and more accurately stabilize the potential of the first node N1, thereby improving the working reliability of the anti-coupling module 20 in the display panel 100.

[0045] Optionally, the capacitance of the first capacitor C1 in the anti-coupling module 20 in the plurality of pixel circuits 200 in the same pixel row 2001 is the same, which is beneficial to reduce the complexity in manufacturing the anti-coupling module 20 in the display panel 100.

[0046] In some other embodiments, since the pixel circuits 200 in the same row are electrically connected to the same light-emitting control signal line SEM, there is also a certain voltage drop in the process of transmitting the light-emitting control signal EM by the light-emitting control signal line SEM, and the potential of the light-emitting control signal EM received by the pixel circuits 200 in the same row may also have a certain difference. Therefore, the capacitance of the first capacitor C1 in the anti-coupling module 20 in the plurality of pixel circuits 200 in the same pixel row 2001 can also be different, which is beneficial to further improve the display uniformity of the display panel 100.

[0047] In one embodiment of the present application, continuing to refer to Figure 5 As shown in the figure, the access end of the first power voltage signal line SVGH is close to the lower frame 1001 of the display panel 100, and in the direction from the first-stage first shift register circuit 40(1) to the last-stage first shift register circuit 40(N), the last-stage first shift register circuit 40(N) is closer to the lower frame 1001 of the display panel 100. Therefore, from the first power voltage signal line SVGH extending in the first direction X1, the starting end of the first power voltage signal line SVGH receiving the high-level signal VGH is close to the lower frame 1001 of the display panel 100. The closer to the lower frame 1001 of the display panel 100, the smaller the wiring impedance of the first power voltage signal line SVGH at the position, and it can be approximately considered that the high-level signal VGH received by the first shift register circuit 40 at the position close to the lower frame 1001 of the display panel 100 is closer to the level of the high-level signal VGH received by the first power voltage signal line SVGH from the access end. It can be obtained that in the direction from the last-stage first shift register circuit 40(N) to the first-stage first shift register circuit 40(1), the potential of the high-level signal VGH received by the plurality of first shift register circuits 40 presents a gradually decreasing trend.

[0048] The last row of pixel rows 2001 closest to the lower frame 1001 of the display panel 100 is the first row of pixel rows 2001 farthest from the lower frame 1001 in the display panel 100. In this way, the potential of the high-level signal VGH of the light-emitting control signal EM received by the pixel row 2001 closest to the lower frame 1001 of the display panel 100 is the highest when the light-emitting control signal EM is switched to the high level. From the last row of pixel rows to the first row of pixel rows, the potential of the high-level signal VGH of the light-emitting control signal EM received by the plurality of pixel rows 2001 gradually decreases. In this way, in the first direction X1, the degree of coupling of the light-emitting control signal EM to the first node N1 due to the level jump of the pixel circuits 200 in the last row of pixel rows to the first row of pixel rows is smaller, so that the degree of the first node N1 in the pixel circuit 200 in the last row of pixel rows to the first row of pixel rows being coupled to be raised by the light-emitting control signal EM is smaller.

[0049] According to the above analysis, in the plurality of pixel rows 2001 of the display panel 100, the first nodes N1 in the pixel circuits 200 of different rows are different in the degree of coupling, and the degree of the first node N1 in the pixel circuit 200 from the first row of pixel rows to the last row of pixel rows being coupled to be raised by the light-emitting control signal EM is greater.

[0050] Therefore, in order to adapt to the above-mentioned coupling degree change, in the embodiment of the present application, the capacitance value of the first capacitor C1 in the plurality of pixel circuits 200 gradually increases in the direction from the first-stage first shift register circuit 40(1) to the last-stage first shift register circuit 40(N). Increasing the capacitance value of the first capacitor C1 is beneficial to improve the anti-coupling ability of the anti-coupling module 20. It is beneficial to gradually improve the anti-coupling ability of the anti-coupling module 20 in the pixel circuit 200 from the first row of pixel rows to the last row of pixel rows. Thus, the adaptability of the first node N1 of the pixel circuit 200 in the plurality of pixel rows is ensured to be stable, and the display uniformity of the display panel 100 is improved.

[0051] In an embodiment of the present application, continuing to refer to Figure 5The display panel 100 shown in the figure, the first electrical signal V1 electrically connected to the anti-coupling module 20 in the plurality of pixel circuits 200 arranged along the first direction X1 is different. In the anti-coupling module 20, one plate of the first capacitor C1 is electrically connected to the first electrical signal V1, and the other plate is electrically connected to the first switch K1. When the first switch K1 is turned on, the first capacitor C1 is electrically connected to the first node N1 through the first switch K1. When there is a potential difference between the two plates of the first capacitor C1, the first capacitor C1 will store electric charge. When the potential difference between the two plates of the first capacitor C1 is greater, the amount of electric charge that the first capacitor C1 can store is greater. When the potential of the first node N1 is coupled to a greater extent, the first capacitor C1 needs to absorb more electric charge from the first node N1, and at this time the first capacitor C1 needs to have a certain potential difference between the two plates.

[0052] Therefore, the size of the first electrical signal V1 has a certain influence on the potential difference between the two plates of the first capacitor C1, thereby the size of the first electrical signal V1 has a certain influence on adjusting the amount of electric charge that the first capacitor C1 can store. In the embodiment of the present application, the first electrical signal V1 electrically connected to the anti-coupling module 20 in the plurality of pixel circuits 200 arranged along the first direction X1 is different, which is beneficial to adaptively adjusting the anti-coupling capability of the anti-coupling module 20 in different pixel rows, and improving the working reliability of the anti-coupling module 20 in the display panel 100.

[0053] In an embodiment of the present application, continuing to refer to Figure 5 The display panel 100 shown in the figure, the access end of the first power voltage signal line SVGH is close to the lower frame 1001 of the display panel 100. As described above, the closer the first power voltage signal line SVGH is to the access end position, the higher the potential of the high-level signal VGH output at the access end position, and the potential of the high-level signal VGH output away from the access end position also decreases. In the direction from the first stage first shift register circuit 40(1) to the last stage first shift register circuit 40(N), the last stage first shift register circuit 40(N) is closer to the lower frame 1001 of the display panel. In the plurality of pixel rows 2001 of the display panel 100, the first nodes N1 in the pixel circuits 200 in different rows are different in the degree of coupling, and the potential of the first node N1 in the pixel circuit 200 from the first row to the last row is coupled to be raised by the light-emitting control signal EM. The greater the degree of coupling.

[0054] In the embodiment of the present application, the first electric signal V1 electrically connected to the second pole of the anti-coupling module 20 in the plurality of pixel circuits 200 gradually increases in the direction from the first-stage first shift register circuit 40(1) to the last-stage first shift register circuit 40N. The higher the potential of the first electric signal V1 electrically connected to the second pole of the anti-coupling module 20, the greater the potential difference between the two plates of the first capacitor C1, and the greater the ability of the first capacitor C1 to absorb charges when the potential of the first node N1 is coupled to increase. Moreover, in the direction from the first-stage first shift register circuit 40(1) to the last-stage first shift register circuit 40N, the degree to which the first node N1 in the plurality of pixel circuits 200 arranged in the first direction X1 is coupled to increase gradually increases, and the amount of charges that the first capacitor C1 in the plurality of pixel circuits 200 arranged in the first direction X1 needs to absorb gradually increases. Therefore, the technical solution is advantageous in increasing the amount of charges that the first capacitor C1 in the anti-coupling module 20 in the plurality of pixel circuits 200 arranged in the first direction X1 can absorb, so as to more accurately adjust the anti-coupling ability of the plurality of anti-coupling modules 20.

[0055] In an embodiment of the present application, the second pole of the anti-coupling module 20 is electrically connected to a direct current signal. The first electric signal V1 is a direct current signal, and the first capacitor C1 in the anti-coupling module 20 is electrically connected to the direct current signal, so that the signal can be isolated and transmitted. Specifically, the first capacitor C1 allows alternating current signals to pass through when the potential of the first node N1 fluctuates, while simultaneously blocking direct current signals. The first capacitor C1 can store charges without forming a loop with the first node N1, thereby ensuring the stability of the operation of the pixel circuit 200.

[0056] Continuing to refer to the pixel circuit 200 shown in Figure 1 , Figure 4 The pixel circuit 200 further includes a first reset module 50, a second reset module 60, a data writing module 70, a threshold voltage compensation module 80, and a second light-emitting control module 90, for example.

[0057] The first reset module 50 is configured to transmit the first reset voltage Vref1 to the gate of the driving transistor Md, so as to reset the gate of the driving transistor Md. The second reset module 60 is configured to transmit the second reset voltage Vref2 to the first node N1, so as to reset the first node N1, i.e., the first electrode 3001 of the light emitting device 300, thereby ensuring the accuracy of the light emitting driving current received by the light emitting device 300 in the light emitting stage E2. The data writing module 70 is configured to transmit the data signal Vdata to the driving transistor Md. The threshold voltage compensation module 80 is configured to transmit the data signal Vdata and the threshold voltage of the driving transistor Md to the gate of the driving transistor Md. The second light emitting control module 90 is configured to transmit the power supply voltage PVDD to the driving transistor Md in the light emitting stage E2, so as to drive the driving transistor Md to generate the light emitting driving current. Optionally, the gates of the first light emitting control module 10 and the second light emitting control module 90 both receive the light emitting control signal EM.

[0058] Exemplarily, the first switch K1 is a switch transistor, and the first light emitting control module 10, the first reset module 50, the second reset module 60, the data writing module 70, the threshold voltage compensation module 80, and the second light emitting control module 90 each include at least one switch transistor, and the transistors included in the pixel circuit 200 are all P-type transistors.

[0059] Optionally, the first electrical signal V1 can be one of the positive power supply voltage PVDD, the negative power supply voltage PVEE, the first reset voltage Vref1, and the second reset voltage Vref2, so as to reduce the number of electrical signal lines used in the pixel circuit 200.

[0060] In an embodiment of the present application, the display panel 100 includes the first working mode M1 and the second working mode M2, and the working brightness of the display panel 100 in the first working mode M1 is less than the working brightness of the display panel 100 in the second working mode M2. When the display panel 100 is in the first working mode M1, the light emitting driving current received by the light emitting device 300 is smaller. When the light emitting driving current is smaller, the fluctuation of the potential of the first node N1 is more obvious when mapped to the display brightness of the light emitting device 300. Therefore, in the working process of the display panel 100, the influence of the coupling on the first node N1 is more obvious in the first working mode M1.

[0061] In this embodiment, the anti-coupling module 20 is configured to operate at least when the display panel 100 is in the first operating mode M1. This helps to mitigate the impact of coupling on the first node N1 of the display panel 100 during the first operating mode M1, stabilizes the potential of the first node N1, and ensures the accuracy of the luminous brightness when the operating brightness of the display panel 100 is low. For example, the anti-coupling module 20 is enabled when the display panel 100 is operating in the first operating mode M1 and disabled when the display panel 100 is operating in the second operating mode M2, which helps to reduce the power consumption generated by the anti-coupling module 20.

[0062] Figure 7 This is a schematic diagram of a display device provided in this application.

[0063] This application provides a display device 400, such as... Figure 7 As shown, the display device 400 includes the display panel 100 as provided in the above embodiment. Optionally, the display device 400 is a device for display such as a computer, television, or mobile phone.

[0064] In the display device 400, to avoid the coupling effect of the light emission control signal EM transition on the first node N1, the pixel circuit 200 further includes an anti-coupling module 20. The first terminal of the anti-coupling module 20 is electrically connected to the first node N1, and the second terminal is electrically connected to the first electrical signal V1. This facilitates conduction between the anti-coupling module 20 and the first node N1, preventing the path containing the anti-coupling module 20 from being suspended. The anti-coupling module 20 can store or release charge. When the potential of the first node N1 is coupled up, the anti-coupling module 20 can absorb excess charge from the first node N1, thereby stabilizing the potential of the first node N1. When the light emission control signal EM transitions from a low level to a high level, because the first node N1 is electrically connected to the anti-coupling module 20, the potential of the first node N1 will not be easily coupled up, improving the potential stability of the first node N1. This effectively reduces signal noise, thereby ensuring the accuracy of the light emission driving current flowing to the light-emitting device 300 and guaranteeing the display effect.

[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A display panel, characterized in that, Includes multiple pixel circuits, the pixel circuits including: A driving transistor, wherein the driving transistor is used to generate a light-emitting driving current to drive a light-emitting device to emit light; A first light-emitting control module is electrically connected to a light-emitting device. The first terminal of the first light-emitting control module is electrically connected to the driving transistor, the second terminal is electrically connected to the light-emitting device, and the control terminal is electrically connected to the light-emitting control signal line. The light-emitting control signal transmitted by the light-emitting control signal line switches between high and low levels. The first node is located between the second electrode of the first light-emitting control module and the light-emitting device; The pixel circuit further includes an anti-coupling module, wherein the first pole of the anti-coupling module is electrically connected to the first node and the second pole is electrically connected to the first electrical signal.

2. The display panel according to claim 1, characterized in that, The anti-coupling module is activated during the transition of the light emission control signal from low to high level.

3. The display panel according to claim 2, characterized in that, When the light emission control signal line transmits a low-level signal, the first light emission control module is turned on. The operating cycle of the pixel circuit includes: During the non-light-emitting phase, the light-emitting control signal line transmits a high-level signal; During the light-emitting phase, the light-emitting control signal line transmits a low-level signal; The anti-coupling phase begins before the start of the non-luminescent phase and ends before the start of the luminescent phase.

4. The display panel according to claim 3, characterized in that, The start time of the anti-coupling phase differs from the start time of the non-luminescent phase by a first time, and the end time of the anti-coupling phase differs from the start time of the luminescent phase by a second time. Wherein, the first time is greater than the time it takes for the light-emitting stage to transition to the non-light-emitting stage, and the second time is greater than the time it takes for the non-light-emitting stage to transition to the light-emitting stage.

5. The display panel according to claim 1, characterized in that, The anti-coupling module includes a first switch and a first capacitor. The first pole of the first switch is electrically connected to the first node, and the second pole is electrically connected to the first capacitor.

6. The display panel according to claim 5, characterized in that, The display panel includes a plurality of first shift register circuits cascaded along a first direction, and the output terminals of the plurality of first shift register circuits are electrically connected to a plurality of light emission control signal lines arranged along the first direction; the display panel also includes a pixel row arranged along the first direction, the pixel row including a plurality of pixel circuits arranged along a second direction, and at least a portion of the pixel circuits in the same pixel row are electrically connected to the same light emission control signal line; the first direction and the second direction intersect and are both parallel to the plane of the display panel; Among them, multiple first shift register circuits cascaded along the first direction are electrically connected to the same first power supply voltage signal line, which is used to transmit high-level signals.

7. The display panel according to claim 6, characterized in that, The capacitance values ​​of the first capacitors in the multiple pixel circuits arranged along the first direction are different.

8. The display panel according to claim 7, characterized in that, The input terminal of the first power supply voltage signal line is close to the lower edge of the display panel. In the direction from the first stage first shift register circuit to the last stage first shift register circuit, the last stage first shift register circuit is closer to the lower edge of the display panel. In the direction from the first shift register circuit in the first stage to the last stage of the first shift register circuit, the capacitance value of the first capacitor in the plurality of pixel circuits gradually increases.

9. The display panel according to claim 6 or 7, characterized in that, The first electrical signal connected to the anti-coupling module in the plurality of pixel circuits arranged along the first direction is different.

10. The display panel according to claim 9, characterized in that, The input terminal of the first power supply voltage signal line is close to the lower edge of the display panel; in the direction from the first stage first shift register circuit to the last stage first shift register circuit, the last stage first shift register circuit is closer to the lower edge of the display panel. In the direction from the first shift register circuit in the first stage to the last stage of the first shift register circuit, the first electrical signal connected to the second pole of the anti-coupling module in the plurality of pixel circuits gradually increases.

11. The display panel according to claim 9, characterized in that, The second pole of the anti-coupling module is electrically connected to a DC signal.

12. The display panel according to claim 1, characterized in that, The display panel includes a first working mode and a second working mode, wherein the brightness of the display panel in the first working mode is less than the brightness of the display panel in the second working mode. The anti-coupling module operates at least when the display panel is in the first operating mode.

13. A display device, characterized in that, Includes the display panel as described in any one of claims 1-12.

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