WO2024036759A1

WO2024036759A1 - Light-emitting control circuit, driving method for light-emitting control circuit, and display device

Info

Publication number: WO2024036759A1
Application number: PCT/CN2022/129157
Authority: WO
Inventors: 米磊; 曹昆; 张兵
Original assignee: 昆山国显光电有限公司
Priority date: 2022-08-15
Filing date: 2022-11-02
Publication date: 2024-02-22
Also published as: CN115294917A

Abstract

A light-emitting control circuit, a driving method for the light-emitting control circuit, and a display device. The light-emitting control circuit comprises: a first input module (110), a second input module (120), a first output module (130), a second output module (140), a voltage clamping module (150), and a voltage maintaining module (160). When the first input module (110) responds to a first control signal (X), the first output module (130) responds to the potential of a first node (N1), the second output module (140) fails to respond to the potential of a second node (N2), and the first output module (130) can stably control the potential of an output end of the light-emitting control circuit. When the second input module (120) responds to a second control signal (Y), the second output module (140) responds to the potential of the second node (N2), the first output module (130) fails to respond to the potential of the first node (N1), and the second output module (140) can stably control the potential of the output end of the light-emitting control circuit. The voltage maintaining module can perform bootstrap coupling according to a third control signal (S) so as to stably maintain the potential of the second node (N2).

Description

Light emitting control circuit, driving method of light emitting control circuit, and display device

This application claims priority to the Chinese patent application submitted to the China Patent Office on August 15, 2022, with the application number 202210976316.9 and the application name "Light-emitting control circuit, driving method of light-emitting control circuit and display device", and its entire content is approved by This reference is incorporated into this application.

Technical field

The present application relates to the field of display technology, and in particular, to a light-emitting control circuit, a driving method of the light-emitting control circuit, and a display device.

Background technique

With the continuous development of display technology, consumers have higher and higher display requirements for display panels. Among them, a light-emitting control circuit is provided in the display panel to provide a light-emitting control signal to the pixel unit, and controls the light-emitting device in the pixel unit to emit light to realize the display of the display panel. In the prior art, the light-emitting control circuit has a problem of poor reliability, which results in poor stability of the light-emitting control signal output by the light-emitting control circuit, which in turn causes display problems on the display panel.

Contents of the invention

Embodiments of the present application provide a light-emitting control circuit, a driving method of the light-emitting control circuit, and a display device to improve the stability of the output of the light-emitting control circuit.

In order to achieve the above technical objectives, the embodiments of this application provide the following technical solutions:

A lighting control circuit including:

a first input module, a second input module, a first output module, a second output module, a voltage clamping module and a voltage maintaining module;

The output end of the first input module and the control end of the first output module are electrically connected; the control end of the first output module is defined as the first node, and the first input module responds to the first control signal to The potential of the first node is controlled; the first output module responds to the potential of the first node and controls the potential of the output end of the light-emitting control circuit;

The output end of the second input module is electrically connected to the control end of the second output module; the control end of the second output module is defined as a second node, and the second input module responds to the second control signal to The potential of the second node is controlled; the second output module responds to the potential of the second node and controls the potential of the output end of the light-emitting control circuit;

A voltage clamping module, the voltage clamping module is connected between the first node and the second node and is used to control the potentials of the first node and the second node to be opposite;

The voltage maintenance module is electrically connected to the second node, and the voltage maintenance module is also connected to a third control signal; the voltage maintenance module performs bootstrap coupling according to the third control signal to maintain the second potential of the node.

Correspondingly, embodiments of the present application also provide a driving method for a light-emitting control circuit. This driving method can be applied to the light-emitting control circuit described in any embodiment of the present application. The driving method of the light-emitting control circuit includes:

In the first stage, the first control signal controls the first input module to be turned on, and the potential of the first node switches; the first node controls the first output module to be turned on, and the lighting control circuit Potential switching at the output end; the voltage clamping module controls the potential clamping of the second node, and the second node controls the disconnection of the second output module;

In the second stage, the second control signal controls the second input module to be turned on, and the potential of the second node is switched; the second node controls the second output module to be turned on, and the lighting control circuit Potential switching at the output end; the voltage clamping module controls the potential clamping of the first node, and the first node controls the disconnection of the first output module;

Wherein, in the second stage, the voltage maintenance module performs bootstrap coupling according to the third control signal to maintain the potential of the second node.

Correspondingly, an embodiment of the present application also provides a display device, which includes: a plurality of the light-emitting control circuits provided in any embodiment of the present application connected in cascade.

The lighting control circuit provided by the embodiment of the present application is electrically connected through the output terminal of the first input module and the control terminal (first node) of the first output module, and the output terminal of the second input module and the control terminal (first node) of the second output module. The second node) is electrically connected, and the voltage clamping module is connected between the first node and the second node. During the period when the first input module responds to the first control signal, the first node potential can be stably controlled. At the same time, the voltage clamping module controls the potential of the second node to jump to a potential opposite to that of the first node. Therefore, the first output module responds to the potential of the first node, and the second output module cannot respond to the potential of the second node, so that the first output module can stably control the potential of the output terminal of the light-emitting control circuit, thereby improving the output of the light-emitting control circuit. stability. During the period when the second input module responds to the second control signal, the second node potential can be stably controlled. At the same time, the voltage clamping module controls the potential of the first node to jump to an opposite potential to that of the second node. Therefore, the second output module responds to the potential of the second node, and the first output module cannot respond to the potential of the first node, so that the second output module can stably control the potential of the output terminal of the light-emitting control circuit, thereby improving the output of the light-emitting control circuit. stability. In addition, the second node of the light-emitting control circuit needs to be maintained at a certain fixed potential for a long time. The voltage maintenance module is electrically connected to the second node. The voltage maintenance module can perform bootstrap coupling according to the third control signal to supplement power to the second node. , to stably maintain the potential of the second node.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a lighting control circuit provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of the connection between a light-emitting control circuit and a scanning circuit provided by an embodiment of the present application;

Figure 3 is a schematic circuit structure diagram of an n-th level pixel driving circuit provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 5 is a schematic diagram of the driving timing of a light-emitting control circuit provided by an embodiment of the present application;

Figure 6 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application;

Figure 7 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application;

Figure 8 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application;

Figure 9 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application;

Figure 10 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 11 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 12 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 13 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 14 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 15 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 16 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 17 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 18 is a schematic structural diagram of another lighting control circuit provided by an embodiment of the present application;

Figure 19 is a schematic flowchart of a driving method for a lighting control circuit provided by an embodiment of the present application;

Figure 20 is a schematic structural diagram of a display device provided by an embodiment of the present application;

Figure 21 is a schematic diagram of the driving timing of another lighting control circuit provided by an embodiment of the present application;

FIG. 22 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application.

Detailed ways

In order to enable those in the technical field to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only These are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of this application.

It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the term "comprises" and any variations thereof are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus that consists of a series of steps or units need not be limited to those steps or units expressly listed , but may include other steps or elements not expressly listed or inherent to such processes, methods, products or devices.

An embodiment of the present application provides a lighting control circuit. FIG. 1 is a schematic structural diagram of a lighting control circuit provided by an embodiment of the present application. Referring to FIG. 1 , the lighting control circuit includes: a first input module 110 , a second input module 120 , a first output module 130 , a second output module 140 , a voltage clamping module 150 and a voltage maintaining module 160 .

The output terminal of the first input module 110 is electrically connected to the control terminal of the first output module 130; the control terminal of the first output module 130 is defined as the first node N1, and the first input module 110 responds to the first control signal The potential of N1 is controlled; the first output module 130 responds to the potential of the first node N1 and controls the potential of the output terminal OUT of the lighting control circuit. The output terminal of the second input module 120 is electrically connected to the control terminal of the second output module 140; the control terminal of the second output module 140 is defined as the second node N2, and the second input module 120 responds to the second control signal Y to the second node The potential of N2 is controlled; the second output module 140 responds to the potential of the second node N2 and controls the potential of the output end of the lighting control circuit. The voltage clamping module 150 is connected between the first node N1 and the second node N2, and is used to control the potentials of the first node N1 and the second node N2 to be opposite. The voltage maintenance module 160 is electrically connected to the second node N2, and is also connected to the third control signal S; the voltage maintenance module 160 performs bootstrap coupling according to the third control signal S to maintain the potential of the second node N2.

Specifically, the light-emitting control circuit refers to a shift register circuit that outputs a light-emitting control signal. The signal output by the output terminal of the light-emitting control circuit is the light-emitting control signal (EM signal) in the pixel circuit. That is, the potential of the output terminal of the light-emitting control circuit can control the pixel. The turning on and off of the transistors in the circuit controls the working state of the light-emitting device.

Wherein, the control terminal of the first output module 130 is defined as the first node N1, that is to say, the interconnection node of the control terminals of the first input module 110, the voltage clamping module 150 and the first output module 130 is the first node N1. The control terminal of the second output module 140 is defined as the second node N2, that is to say, the interconnection node of the control terminals of the second input module 120, the voltage clamping module 150, the voltage maintenance module 160 and the second output module 140 is the second node. N2.

During the period when the first input module 110 controls the potential of the control terminal of the first output module 130 (the potential of the first node N1) according to the first control signal . At the same time, the voltage clamping module 150 can control the potential of the second node N2 to jump to a potential opposite to that of the first node N1 according to the potential of the first node N1, thereby ensuring that the second output module 140 responds to the potential interruption of the second node N2. is turned on, so that the second output module 140 cannot control the potential of the output terminal of the lighting control circuit. This ensures that during the period when the first input module 110 controls the potential of the first node N1 according to the first control signal stability.

During the period when the second input module 120 controls the potential of the control terminal of the second output module 140 (the potential of the second node N2) according to the second control signal Y, the second output module 140 can control the potential of the output terminal of the lighting control circuit according to the potential of the second node N2. . At the same time, the voltage clamping module 150 can control the potential of the first node N1 to jump to an opposite potential to the second node N2 according to the potential of the second node N2, thereby ensuring that the first output module 130 responds to the potential interruption of the first node N1. is turned on, so that the first output module 130 cannot control the potential of the output terminal of the lighting control circuit. This can ensure that during the period when the second input module 120 controls the potential of the second node N2 according to the second control signal Y, the second output module 140 can stably control the potential of the output terminal of the light-emitting control circuit, thereby improving the output of the light-emitting control circuit. stability.

It should be added that the second node N2 of the light-emitting control circuit needs to be maintained at a certain fixed potential for a long time. In order to ensure the stability of the potential of the second node N2, the voltage maintenance module 160 needs to perform bootstrap coupling according to the third control signal S. To supplement electric energy to the second node N2, the second node N2 can be maintained at a certain fixed potential for a long time. Among them, the third control signal S is a signal whose potential changes high and low. During the process of the potential change of the third control signal S, the voltage maintenance module 160 can perform bootstrap coupling according to the third control signal S to achieve stable maintenance of the second node N2 potential.

Specifically, the first input module 110 of the n-th level light-emitting control circuit is connected to the output end of the n-th level scanning circuit, and the second input module 120 is connected to the output end of the n+k-th level scanning circuit. Therefore, the output signal of the n-th stage scanning circuit (first control signal The signal Y) can control the second output module 140 to control the potential of the output end of the lighting control circuit.

It should be noted that the second control signal Y is output delayed by at least one clock cycle compared to the first control signal X, that is, K is a positive integer. Correspondingly, it can be ensured that during the period when the scanning circuit provides the first control signal X to the light-emitting control circuit, the first output module 130 controls the potential of the output terminal of the light-emitting control circuit for at least one clock cycle.

The embodiment of the present application uses the output signal of the n-th level scanning circuit as the first control signal Compared with the existing technology, the signal Y eliminates the necessary clock signal for conventional circuits, simplifies the circuit setting of the lighting control circuit, and facilitates the adjustment of the duration for which the first output module 130 controls the potential of the output terminal of the lighting control circuit.

Among them, when the first output module 130 in the light-emitting control circuit controls the potential of the output terminal OUT of the light-emitting control circuit for one clock cycle, the light-emitting control signal generated by the light-emitting control circuit has the best control effect on the light-emitting device of the pixel circuit, so that K=2 can be set.

Specifically, FIG. 2 exemplarily shows the connection manner between the n-th, n+1-th and n+2-th level light-emitting control circuits and the scanning circuit from top to bottom. The connection method between the luminescence control circuit and the scanning circuit is as follows: the first input module 110 of the n-th level luminescence control circuit is electrically connected to the output terminal of the n-th level scanning circuit, and the output signal _Gn of the n-th level scanning circuit is used as the first control Signal: The second input module 120 of the n-th stage light-emitting control circuit is electrically connected to the output end of the n+2-th stage scanning circuit, and uses the output signal G _n+2 of the n+2-th stage scanning circuit as the second control signal. In this way, the n-th stage light-emitting control circuit can output the light-emitting control signal EM(n). The first input module 110 of the n+1th stage lighting control circuit is electrically connected to the output end of the n+1th stage scanning circuit, and uses the output signal G _n+1 of the n+1th stage scanning circuit as the first control signal; The second input module 120 of the n+1-th stage light-emitting control circuit is electrically connected to the output end of the n+3-th stage scanning circuit, and uses the output signal G _n+3 of the n+3-th stage scanning circuit as the second control signal. In this way, the n-th stage light-emitting control circuit can output the light-emitting control signal EM(n+1). The first input module 110 of the n+2-th stage light-emitting control circuit is electrically connected to the output end of the n+2-th stage scanning circuit, and uses the output signal G _n+2 of the n+2-th stage scanning circuit as the first control signal; The second input module 120 of the n+2-level light-emitting control circuit is electrically connected to the output end of the n+4-th level scanning circuit, and uses the output signal G _n+4 of the n+4-th level scanning circuit as the second control signal. In this way, the n+2-th stage light-emitting control circuit can output the light-emitting control signal EM(n+2).

Specifically, the pixel driving circuit in this embodiment includes seven transistors and a capacitor, and is often referred to as a "7T1C" pixel driving circuit in the art. Its specific working process is well known to those skilled in the art and will not be described again here.

Combining Figures 2 and 3, it can be seen that the light emission control signal EM(n) generated by the n-th level light-emitting control circuit 100 is output to the control end of the first light-emitting control transistor M3 and the second light-emitting control transistor M4 of the n-th level pixel circuit, thereby The light-emitting device D of the n-th level pixel circuit is controlled to emit light.

In the following embodiments, the first input module 110 , the second input module 120 , the first output module 130 and the second output module 140 are configured to be turned on in response to a high potential. The first input module 110 , the second input module 120 , the first The output module 130 and the second output module 140 respond to the low-voltage disconnection, and describe the working process of the lighting control circuit. In other embodiments, the first input module 110, the second input module 120, the first output module 130 and the second output module 140 can be configured to be turned on in response to a low potential. The first input module 110, the second input module 120, The first output module 130 and the second output module 140 are turned off in response to the high potential.

FIG. 5 is a schematic diagram of the driving timing of a light-emitting control circuit provided by an embodiment of the present application. Combining Figures 4 and 5, for example, the first control signal X is G _n and the second control signal Y is G _n+2 . The driving process of the light-emitting control circuit is as follows:

In the first stage T1, the first control signal jumps from low level to high level. The first input module 110 is turned on in response to the high level of the first control signal and controls the first node N1 to switch to high level. The first output module 130 responds to the high-level conduction of the first node N1 and outputs the low-level signal VGL to the output end of the light-emitting control circuit. At the same time, the voltage clamping module 150 controls the potential of the second node N2 to become a low level, and the second output module 140 turns off in response to the low potential of the second node N2.

In the second stage T2, the second control signal jumps from low level to high level. The second input module 120 is turned on in response to the high level of the second control signal and controls the second node N2 to switch to high level. The second output module 140 responds to the high-level conduction of the second node N2 and outputs the high-level signal VGH to the output end of the light-emitting control circuit. At the same time, the voltage clamping module 150 controls the potential of the first node N1 to become a low level, and the first output module 130 turns off in response to the low potential of the first node N1.

Among them, in the second stage T2, the voltage maintenance module 160 performs bootstrap coupling according to the third control signal S to maintain the potential of the second node N2.

FIG. 8 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application. As _shown in Figure 8, for example, the _first control signal The output signal EM(n+1) of the stage lighting control circuit.

FIG. 9 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application. As _shown in Figure 9, for example, the _first control signal The output signal EM(n+2) of the stage lighting control circuit.

Combined with Figure 4, Figure 8 and Figure 9, the second stage: the second control signal jumps from low level to high level, the second input module 120 responds to the high potential conduction of the second control signal, and controls the second node N2 Switch to high level. The second output module 140 responds to the high-level conduction of the second node N2 and outputs the high-level signal VGH to the output end of the light-emitting control circuit. Since the second node N2 has a leakage problem, it is difficult to maintain the voltage of the second node N2 at a high level. At this time, the output signal EM(n+1) or the n+th level light-emitting control circuit is used. The output signal EM(n+2) of the level 2 light emitting control circuit maintains the high potential of the second node N2. When the output signal of the n+1-th or n+2-th level light-emitting control circuit changes from low level to high level, the output signal EM ( n+1) or the high level of the output signal EM(n+2) of the n+2th stage light-emitting control circuit is coupled to the second node N2, so that the potential of the second node N2 can supplement the dropped electric energy, so that it can be maintained for a long time. time remains high. Because at the moment when the second output module 140 starts to output the high-level signal VGH to the output terminal of the lighting control circuit, the output signal EM(n+1) of the lighting control circuit of the n+1th stage or the lighting of the n+2th stage The output signal signal EM(n+2) of the control circuit is low level. At this time, the voltage maintenance module 160 cannot supplement the potential of the second node N2, so the second output module 140 outputs the high level signal VGH to the lighting control The output of the circuit is slightly slower.

In summary, comparing Figures 6 to 9, the effect analysis of the signal output from the light-emitting control circuit: In Figure 6, the second output module 140 outputs the high-level signal VGH to the output end of the light-emitting control circuit at the fastest speed, indicating that the same as the first The first clock signal ECK1 whose waveforms of the two control signals overlap has the best effect of maintaining the potential of the second node N2. Starting from the circuit design of the light-emitting control circuit, compared with the existing technology, the light-emitting control circuit corresponding to Figures 8 and 9 removes the clock signal necessary for conventional circuits, simplifying the circuit settings of the light-emitting control circuit.

For example, the first transistor T1 and the second transistor T2 are both N-type transistors, and the conduction level of the first transistor T1 and the second transistor T2 is high level. The reset signal Rest is low level. Referring to Figure 5 and Figure 11, in an exemplary first phase: the first node N1 is high level. The voltage clamping module 150 clamps the potential of the second node N2 to a low level, and in response to the low potential of the second node N2, the second transistor T2 is turned off. At the same time, in response to the high potential of the first node N1, the first transistor T1 is turned on. The first transistor T1 is turned on to output the low level of the reset signal Rest to the second plate of the first capacitor C1. Due to the coupling effect of the first capacitor C1, the second node N2 is further maintained at a low level.

Second stage: The second node N2 is high level. The voltage clamping module 150 clamps the potential of the first node N1 to a low level, and in response to the low potential of the first node N1, the first transistor T1 is turned off. At the same time, in response to the high potential of the second node N2, the second transistor T2 is turned on. The second transistor T2 is turned on to output the third control signal S to the second plate of the first capacitor C1. When the third control signal S changes from low level to high level, due to the coupling effect of the first capacitor C1, the electric energy lost due to leakage can be replenished to the second node N2, so that the second node N2 can be maintained at a high level.

Among them, in the second stage: the second control signal Y controls to turn on the first reset module 170, causing the potential of the first node N1 to switch quickly, and the first node N1 controls the first output module 130 to turn off. At the same time, the second control signal Y controls the second input module 120 to be turned on, and the potential of the second node N2 is switched. The second node N2 controls the second output module 140 to be turned on, and the potential of the output terminal of the light-emitting control circuit is switched, thereby further improving the stability of the output signal of the light-emitting control circuit.

And/or, the second input module 120 includes: a sixth transistor T6, the gate of the sixth transistor T6 is connected to the second control signal Y, the first electrode of the sixth transistor T6 is connected to the first level signal V1, and the sixth transistor T6 is connected to the first level signal V1. The second pole of the transistor T6 is electrically connected to the second node N2.

And/or, the voltage clamping module 150 includes: a seventh transistor T7 and an eighth transistor T8; the gate of the seventh transistor T7 is electrically connected to the second node N2, and the first electrode of the seventh transistor T7 is connected to the second level. Signal V2, the second pole of the seventh transistor T7 is electrically connected to the first node N1.

The gate of the eighth transistor T8 is electrically connected to the first node N1, the first electrode of the eighth transistor T8 is connected to the second level signal V2, and the second electrode of the eighth transistor T8 is electrically connected to the second node N2.

And/or, the first output module 130 includes: a ninth transistor T9, the gate of the ninth transistor T9 is electrically connected to the first node N1, the first electrode of the ninth transistor T9 is connected to the second level signal V2, and the ninth transistor T9 is electrically connected to the first node N1. The second pole of the transistor T9 is electrically connected to the output terminal of the light emitting control circuit.

And/or, the second output module 140 includes: a tenth transistor T10, the gate of the tenth transistor T10 is electrically connected to the second node N2, the first electrode of the tenth transistor T10 is connected to the third level signal V3, and the gate of the tenth transistor T10 is electrically connected to the second node N2. The second pole of the transistor T10 is electrically connected to the output terminal of the light emitting control circuit. The embodiment of the present application is configured in this way, and the circuit structure is simple and easy to implement.

An embodiment of the present application also provides a driving method for a light-emitting control circuit, which is used to drive the light-emitting control circuit provided by any embodiment of the present application. FIG. 19 is a schematic flowchart of a driving method for a light-emitting control circuit provided by an embodiment of the present application. Referring to Figure 19, the driving method of the lighting control circuit includes:

S310. In the first stage, the first control signal controls the first input module to be turned on and the potential of the first node is switched; the first node controls the first output module to be turned on and the potential of the output end of the light-emitting control circuit is switched; the voltage clamp module controls The potential of the second node is clamped, and the second node controls the second output module to be disconnected.

In the second stage of S320, the second control signal controls the second input module to be turned on, and the potential of the second node is switched; the second node controls the second output module to be turned on, and the potential of the output end of the light-emitting control circuit is switched; the voltage clamping module controls the second The potential of one node is clamped, and the first node controls the first output module to be turned off; in the second stage, the voltage maintenance module performs bootstrap coupling according to the third control signal to maintain the potential of the second node.

The driving method of the light-emitting control circuit provided by the embodiment of the present application can stably control the first node potential by turning on the first input module in response to the first control signal in the first stage. At the same time, the voltage clamping module controls the potential of the second node to jump to a potential opposite to that of the first node. Therefore, the first output module responds to the potential of the first node, and the second output module cannot respond to the potential of the second node, so that the first output module can stably control the potential of the output terminal of the light-emitting control circuit, thereby improving the output of the light-emitting control circuit. stability. In the second stage, the second input module is turned on in response to the second control signal, and the second node potential can be stably controlled. At the same time, the voltage clamping module controls the potential of the first node to jump to an opposite potential to that of the second node. Therefore, the second output module responds to the potential of the second node, and the first output module cannot respond to the potential of the first node, so that the second output module can stably control the potential of the output terminal of the light-emitting control circuit, thereby improving the output of the light-emitting control circuit. stability. In addition, in the second stage, the second node of the light-emitting control circuit needs to be maintained at a certain fixed potential for a long time. The voltage maintenance module is electrically connected to the second node. The voltage maintenance module can perform bootstrap coupling according to the third control signal to provide the third The second node supplements electric energy to stably maintain the potential of the second node.

An embodiment of the present application also provides a display device, which includes: a plurality of light-emitting control circuits provided by any embodiment of the present application connected in cascade, which has corresponding beneficial effects. FIG. 20 is a schematic structural diagram of a display device provided by an embodiment of the present application. Referring to Figure 20, the first input module 110 of the n-th level lighting control circuit is connected to the output signal _Gn of the n-th level scanning circuit; the second input module 110 of the n-th level lighting control circuit is connected to the output signal Gn of the n+2-th level scanning circuit. Output signal Gn ₊₂ . In this way, the n-th stage light-emitting control circuit can output the light-emitting control signal EM(n). The first input module 110 of the n+1th stage lighting control circuit is connected to the output signal G _n+1 of the n+1th stage scanning circuit; the second input module 110 of the n+1th level lighting control circuit is connected to the n+3th level lighting control circuit. The output signal G _n+3 of the level scanning circuit. In this way, the n+1-th stage light-emitting control circuit can output the light-emitting control signal EM(n+1). The first input module 110 of the n+2-th level lighting control circuit is connected to the output signal G _n+2 of the n+2-th level scanning circuit; the second input module 110 of the n+2-th level lighting control circuit is connected to the n+4-th level lighting control circuit. The output signal G _n+4 of the level scanning circuit. In this way, the n+2-th stage light-emitting control circuit can output the light-emitting control signal EM(n+2).

FIG. 21 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application. Figure 21 exemplarily shows that the first input module of the n-th level lighting control circuit is connected to the output signal _Gn of the n-th level scanning circuit, and the second input module of the n-th level lighting control circuit is connected to the n+2th level The output signal G _n+2 of the level scanning circuit and the light-emitting control signal EM(n) output by the n-th level light-emitting control circuit. The first input module of the n+1th stage light-emitting control circuit is connected to the output signal G _n+1 of the n+1th stage scanning circuit, and the second input module of the n+1th stage light-emitting control circuit is connected to the n+3th stage The output signal G _n+3 of the scanning circuit and the light-emitting control signal EM(n+1) output by the n+1-th stage light-emitting control circuit. The first input module of the n+2-th level lighting control circuit is connected to the output signal G _n+2 of the n+2-th level scanning circuit, and the second input module of the n+2-th level lighting control circuit is connected to the n+4th level The output signal G _n+4 of the scanning circuit and the light-emitting control signal EM(n+2) output by the n+2-th stage light-emitting control circuit. The first input module of the n+3-th level lighting control circuit is connected to the output signal G _n+3 of the n+3-th level scanning circuit, and the second input module of the n+3-th level lighting control circuit is connected to the n+5th level The output signal G _n+5 of the scanning circuit and the light-emitting control signal EM(n+3) output by the n+3-th stage light-emitting control circuit.

FIG. 22 is a schematic diagram of the driving timing of another light-emitting control circuit provided by an embodiment of the present application. FIG. 21 is an enlarged view of the portion framed by the dotted line in FIG. 22 .

22 shows a timing diagram of a multi-frame lighting control signal generated by the lighting control circuit according to the multi-frame scanning signal output by the scanning circuit. FIG. 21 corresponds to the timing diagram of the light-emitting control signal generated by the light-emitting control circuit according to the scanning signal output by the scanning circuit in each frame of FIG. 22 .

It can be seen from the analysis that each scanning signal and each light-emitting control signal in each frame of Figure 22 corresponding to Figure 21 is a pulse signal. However, in some application scenarios, such as the black insertion control of the light-emitting device of the pixel circuit , the lighting control circuit needs to output multiple pulse signals within the timing of each frame.

Embodiments of the present application can enable the lighting control circuit to output multiple pulses of lighting control signals within each frame sequence. For example, two sets of scanning circuits are provided, and one of the scanning circuits can output a single-pulse scanning signal within each frame sequence, and provide the single-pulse scanning signal to the pixel circuit. The other scanning circuit outputs a multi-pulse scanning signal within each frame sequence, and provides the multi-pulse scanning signal to the luminescence control circuit provided in the embodiment of the present application, so that the luminescence control signal output by the luminescence control circuit can realize control. Black insertion control of the light-emitting device of the pixel circuit.

It should be understood that various forms of the process shown above may be used, with steps reordered, added or deleted. For example, each step described in this application can be executed in parallel, sequentially, or in a different order. As long as the desired results of the technical solution of this application can be achieved, there is no limitation here.

The above-mentioned specific embodiments do not constitute a limitation on the scope of protection of the present application. It will be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions are possible depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims

A lighting control circuit, including: a first input module, a second input module, a first output module, a second output module, a voltage clamping module and a voltage maintenance module;

The output end of the first input module and the control end of the first output module are electrically connected; the control end of the first output module is defined as the first node, and the first input module responds to the first control signal to The potential of the first node is controlled; the first output module responds to the potential of the first node and controls the potential of the output end of the light-emitting control circuit;

The output end of the second input module is electrically connected to the control end of the second output module; the control end of the second output module is defined as a second node, and the second input module responds to the second control signal to The potential of the second node is controlled; the second output module responds to the potential of the second node and controls the potential of the output end of the light-emitting control circuit;

A voltage clamping module, the voltage clamping module is connected between the first node and the second node and is used to control the potentials of the first node and the second node to be opposite;

The voltage maintenance module is electrically connected to the second node, and the voltage maintenance module is also connected to a third control signal; the voltage maintenance module performs bootstrap coupling according to the third control signal to maintain the second potential of the node.
The light-emitting control circuit according to claim 1, wherein in the n-th stage light-emitting control circuit, the first control signal is an output signal of the n-th stage scanning circuit, and the second control signal is an n+k-th stage The output signal of the scanning circuit; where n is a positive integer and k is a positive integer;

Preferably, k=2.
The lighting control circuit according to claim 1, wherein the third control signal is a first clock signal; the waveform of the first clock signal overlaps with the effective levels in the waveform of the second control signal. pulse;

Alternatively, the third control signal is a second clock signal; there are no overlapping pulses in the waveform of the second clock signal and the effective level in the waveform of the second control signal;

Or, in the n-th level light-emitting control circuit, the third control signal is the output signal of the n+p-th level light-emitting control circuit; wherein, n and p are both positive integers;

Preferably, p=1 or p=2.
The lighting control circuit according to claim 1, wherein the voltage maintenance module includes: a coupling unit, a reset unit and a bootstrap transmission unit;

The first end of the coupling unit is electrically connected to the second node;

The second end of the coupling unit is electrically connected to the reset unit, and the reset unit is used to initialize the second end of the coupling unit; and, the second end of the coupling unit is connected to the bootstrap transmission The units are electrically connected, and the bootstrap transmission unit is used to transmit the third control signal to the second end of the coupling unit.
The lighting control circuit according to claim 4, wherein the coupling unit includes a first capacitor, a first plate of the first capacitor is electrically connected to the second node;

The reset unit includes a first transistor, a gate of the first transistor is electrically connected to the first node, a first electrode of the first transistor is connected to a reset signal, and a second electrode of the first transistor is connected to the first node. The second plate of the first capacitor is electrically connected;

The bootstrap transmission unit includes a second transistor, a gate of the second transistor is electrically connected to the second node, a first pole of the second node is connected to the third control signal, and the second The second pole of the node is electrically connected to the second plate of the first capacitor;

Preferably, both the first transistor and the second transistor are N-type transistors;

Preferably, the lighting control circuit further includes a second capacitor, a first plate of the second capacitor is electrically connected to the first node, and a second plate of the second capacitor is connected to a reference voltage signal.
The lighting control circuit according to claim 1, further comprising:

A first reset module, the first reset module is electrically connected to the first node, and the first reset module resets the first node in response to the second control signal;

Preferably, the first reset module includes a third transistor, the gate of the third transistor is connected to the second control signal, and the first electrode of the third transistor is connected to the reset signal. The second pole is electrically connected to the first node;

Preferably, the third transistor is an N-type transistor.
The lighting control circuit according to claim 1, further comprising:

a second reset module, the second reset module is electrically connected to the second node, and the second reset module resets the second node in response to the first control signal;

Preferably, the second reset module includes a fourth transistor, the gate of the fourth transistor is connected to the first control signal, and the first electrode of the fourth transistor is connected to the reset signal. The second pole is electrically connected to the second node;

Preferably, the fourth transistor is an N-type transistor.
The lighting control circuit according to claim 1, wherein the first input module includes: a fifth transistor, the gate of the fifth transistor is connected to the first control signal, and the first input module of the fifth transistor is connected to the first control signal. The second pole of the fifth transistor is connected to the first level signal, and the second pole of the fifth transistor is electrically connected to the first node;

And/or, the second input module includes: a sixth transistor, the gate of the sixth transistor is connected to the second control signal, and the first electrode of the sixth transistor is connected to the first level signal, the second pole of the sixth transistor is electrically connected to the second node;

And/or, the voltage clamping module includes: a seventh transistor and an eighth transistor; the gate of the seventh transistor is electrically connected to the second node, and the first electrode of the seventh transistor is connected to the second node. level signal, the second pole of the seventh transistor is electrically connected to the first node;

The gate electrode of the eighth transistor is electrically connected to the first node, the first electrode of the eighth transistor is connected to the second level signal, and the second electrode of the eighth transistor is connected to the second level signal. Node electrical connection;

And/or, the first output module includes: a ninth transistor, a gate of the ninth transistor is electrically connected to the first node, and a first electrode of the ninth transistor is connected to the second level signal, the second pole of the ninth transistor is electrically connected to the output end of the lighting control circuit;

And/or, the second output module includes: a tenth transistor, the gate of the tenth transistor is electrically connected to the second node, and the first electrode of the tenth transistor is connected to a third level signal, The second pole of the tenth transistor is electrically connected to the output terminal of the light emitting control circuit;

Preferably, the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, the ninth transistor and the tenth transistor are all N-type transistors; the first level The signal and the third level signal are both high level, and the second level signal is low level;

Preferably, the voltage of the first level signal is greater than or equal to the voltage of the third level signal.
A method for driving a light emitting control circuit according to any one of claims 1 to 8, which includes:

In the first stage, the first control signal controls the first input module to be turned on, and the potential of the first node switches; the first node controls the first output module to be turned on, and the lighting control circuit Potential switching at the output end; the voltage clamping module controls the potential clamping of the second node, and the second node controls the disconnection of the second output module;

In the second stage, the second control signal controls the second input module to be turned on, and the potential of the second node is switched; the second node controls the second output module to be turned on, and the lighting control circuit Potential switching at the output end; the voltage clamping module controls the potential clamping of the first node, and the first node controls the disconnection of the first output module;

Wherein, in the second stage, the voltage maintenance module performs bootstrap coupling according to the third control signal to maintain the potential of the second node.
A display device comprising: a plurality of light-emitting control circuits according to any one of claims 1-8 connected in cascade.