WO2021248585A1

WO2021248585A1 - Driving circuit, backlight module, and display device

Info

Publication number: WO2021248585A1
Application number: PCT/CN2020/099174
Authority: WO
Inventors: 郭军辉; 彭钟
Original assignee: 武汉华星光电技术有限公司
Priority date: 2020-06-11
Filing date: 2020-06-30
Publication date: 2021-12-16
Also published as: CN111640400A

Abstract

A driving circuit (40), a backlight module (100), and a display device (200). The driving circuit (40) comprises: branching modules (30), used for dividing corresponding light-emitting groups (20) at least into first light-emitting subgroups (23) and second light-emitting subgroups (24), the branching modules (30) respectively being connected to second ends of the corresponding first light-emitting subgroups (23), first ends of the corresponding second light-emitting subgroups (24), second feedback ends (14), and an output end (12), and the second ends of the second light-emitting subgroups (24) being connected to first feedback ends (13).

Description

Drive circuit, backlight module and display device

Technical field

This application relates to the field of display technology, in particular to a driving circuit, a backlight module and a display device.

Background technique

The driving circuit of the backlight module includes a converter. The converter is connected to the power supply voltage Vin, which is generally 5-21V. In most application scenarios, when the input voltage is 12V, the output voltage Vout is mostly 21-36V.

technical problem

However, usually when Vin is equal to a preset voltage, such as 5V, the voltage difference between the output voltage Vout of the converter and the input voltage Vin increases, which results in a serious drop in the energy conversion efficiency of the converter, which in turn causes the drive circuit to drive The effect is reduced.

Technical solutions

The embodiments of the present application provide a driving circuit, a backlight module, and a display device, which can improve the energy conversion efficiency of the converter and the driving effect of the driving circuit.

An embodiment of the present application provides a driving circuit for driving the backlight module, wherein the backlight module includes at least one light-emitting group; the light-emitting group includes a plurality of light-emitting elements connected in series;

The driving circuit includes:

The converter includes an input terminal, an output terminal, at least one first feedback terminal, and at least one second feedback terminal, the input terminal is connected to a first power supply voltage, and the output terminal is used to output a second power supply voltage;

At least one branch module, the branch module is used to divide the corresponding light-emitting group into at least a first sub-light-emitting group and a second sub-light-emitting group, and the branch modules are respectively connected to the corresponding second end of the first sub-light-emitting group Connection, the first end of the second sub-light-emitting group, the second feedback end and the output end are connected, and the second end of the second sub-light-emitting group is connected to the first feedback end; the output end is also Connected to the first end of the first sub-light-emitting group; wherein the branch module corresponds to the light-emitting group, the first feedback terminal, and the second feedback terminal, respectively.

The present invention also provides a backlight module, which includes the above-mentioned driving circuit.

The present invention also provides a display device, which includes the above-mentioned backlight module.

Beneficial effect

The driving circuit, the backlight module, and the display device of the embodiments of the present application include a converter, including an input terminal, an output terminal, at least one first feedback terminal, and at least one second feedback terminal. The input terminal is connected to a first power supply voltage , The output terminal is used to output the second power supply voltage; at least one branch module, the branch module is used to divide the corresponding light-emitting group into at least a first sub-light-emitting group and a second sub-light-emitting group, the branch modules are respectively connected with Correspondingly, the second end of the first sub-light-emitting group is connected, the first end of the second sub-light-emitting group, and the second feedback end are connected to the output end, and the second end of the second sub-light-emitting group is connected to the output end. The first feedback terminal is connected; the output terminal is connected to the first terminal of the first sub-light-emitting group; wherein the branch module is respectively connected to the light-emitting group, the first feedback terminal, and the second feedback Corresponding to the end; due to the addition of branch modules, a single light-emitting group is divided into at least two sub-light-emitting groups, thereby reducing the number of light-emitting elements in a single branch, thereby reducing the voltage difference between the output voltage and the input voltage, Thereby improving the energy conversion efficiency of the converter and the driving effect of the driving circuit.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present application more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative work, other drawings can be obtained based on these drawings.

FIG. 1 is a schematic diagram of the structure of a conventional backlight module.

FIG. 2 is a schematic structural diagram of a backlight module provided by an embodiment of the application.

FIG. 3 is a schematic structural diagram of a backlight module provided by another embodiment of the application.

FIG. 4 is a schematic structural diagram of a backlight module provided by another embodiment of the application.

FIG. 5 is a schematic structural diagram of a backlight module provided by still another embodiment of the application.

FIG. 6 is a schematic structural diagram of a display device provided by an embodiment of the application.

Embodiments of the present invention

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of this application.

In the description of this application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise" and other directions or The positional relationship is based on the position or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it cannot be understood as a restriction on this application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more than two, unless otherwise specifically defined.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be mechanically connected, it can be electrical connection or it can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction of two components relation. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In this application, unless expressly stipulated and defined otherwise, the "above" or "below" of the first feature of the second feature may include direct contact between the first and second features, or may include the first and second features Not in direct contact but through other features between them. Moreover, "above", "above" and "above" the second feature of the first feature include the first feature being directly above and obliquely above the second feature, or merely indicating that the level of the first feature is higher than that of the second feature. The “below”, “below” and “below” of the second feature of the first feature include the first feature directly below and obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

The following disclosure provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and are not intended to limit the application. In addition, the present application may repeat reference numerals and/or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and/or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and/or the use of other materials.

As shown in FIG. 1, the existing backlight module includes a multi-row light-emitting group 20, and the light-emitting group 20 includes a plurality of light-emitting elements 21 connected in series.

The driving circuit (not shown in the figure) includes a converter 10, wherein the converter 10 includes an input terminal 11, an output terminal 12, and a plurality of feedback terminals 13, the input terminal 11 is connected with a first power supply voltage Vin, and the output terminal 12 is used for output The second power supply voltage Vout; the output terminal 12 is connected to the first end of the light-emitting group 20; one end of the light-emitting group 20 (corresponding to the anode of the rightmost light-emitting element) is connected to the output terminal 12, and the other end of the light-emitting group 20 (corresponding to The cathode of the leftmost light-emitting element) is connected to the feedback terminal 13. It is understandable that an inductor L (not shown in the figure) is usually connected between the output terminal 12 of the converter 10 and the second power supply voltage Vout, and the _{formula of the ripple current ΔIL of the input inductor L} is as follows:

ΔΙ _L = (V _in *(V _out -V _in ))/(2*f*L*I _out ) Formula 1

The calculation formula of energy conversion efficiency η is as follows:

η=(V _out *I _out )/(V _in *I _in ) Equation 2

In practical applications, ΔI _L =K*I _in (K is an engineering factor, K is a constant, and different percentages can be set according to actual needs). Based on the above formula, the calculation formula for η is as follows:

η=(2KfV ² _out *I _out )/(V ² _in *(V _out -V _in )) Equation 3

Here I _out and I _in represent the output current and input current respectively, L is the inductance value, f is the switching frequency of the converter, usually L and f are fixed values, and the voltage between the output voltage and the input voltage can be known from Equation 3. The difference is inversely proportional to the energy conversion efficiency, that is, when the voltage difference between the output voltage and the input voltage increases, the energy conversion efficiency will decrease.

Please refer to FIG. 2 to FIG. 4. FIG. 2 is a schematic structural diagram of a driving circuit provided by an embodiment of the application.

As shown in FIG. 2, the backlight module 100 includes at least one light-emitting group 20; the light-emitting group 20 includes a plurality of light-emitting elements 21 connected in series; the light-emitting elements 21 include, but are not limited to, organic light-emitting diodes and micro-organic light-emitting diodes. A sort of. It is understandable that FIG. 2 only takes two rows of light-emitting groups as an example for illustration, but it does not limit the present invention. The backlight module 100 of this embodiment further includes a driving circuit 40, and the driving circuit 40 is used for driving the backlight module, specifically for driving the light-emitting element.

An embodiment of the present invention provides a driving circuit. The driving circuit 40 includes a converter 10 and at least one branch module 30. The converter 10 includes an input terminal 11, an output terminal 12, at least one first feedback terminal 13, and at least one second feedback terminal 14. The input terminal 11 is connected to a first power supply voltage Vin, and the output terminal 12 is used for The second power supply voltage Vout is output; in one embodiment, the first terminal is the anode, and the second terminal is the cathode.

The branch module 30 is used to divide the corresponding light-emitting group 20 into at least a first sub-light-emitting group 23 and a second sub-light-emitting group 24, and the branch module 30 is respectively connected to the corresponding second sub-light-emitting group 23 Terminal connection, the first terminal and the second feedback terminal 14 of the second sub-light-emitting group 24 are connected to the output terminal 12, and the second terminal of the second sub-light-emitting group 24 is connected to the first feedback terminal 13 The output terminal 12 is connected to the first end of the first sub-light-emitting group 23. The output terminal 12 is connected to the first terminal of the first sub-light-emitting group 23. The branch module 30 corresponds to the light-emitting group 20, the first feedback terminal 13 and the second feedback terminal 14 respectively. In a preferred embodiment, in order to further improve the driving effect, the branch module 30 corresponds to the light-emitting group 20, the first feedback terminal 13 and the second feedback terminal 14 in a one-to-one correspondence. Of course, it can be understood that the number of branch modules is not limited to this. The specific structure of the branch module is not limited to this. The first feedback terminal 13 and the second feedback terminal 14 are both connected to a low-level power supply voltage; the low-level power supply voltages connected to the first feedback terminal 13 and the second feedback terminal 14 can be equal or unequal, depending on The voltage on the light emitting element between the output terminal and the first feedback terminal 13 and between the output terminal and the second feedback terminal 14 is set.

In an embodiment, with reference to FIG. 3, each of the branch modules 30 includes: an auxiliary light-emitting diode D1, a first switching element K1, and a second switching element K2;

The first end of the auxiliary light-emitting diode D1 is connected to the second end of the first sub-light-emitting group 23, and the second end of the auxiliary light-emitting diode D1 is connected to the first end of the second sub-light-emitting group 24; one embodiment Among them, the first end is the anode and the second end is the cathode.

One end of the first switch element K1 is respectively connected to the first end of the auxiliary light emitting diode D1 and the second end of the first sub-light-emitting group 23; the other end of the first switch element K1 is connected to the first end of the first light emitting diode D1. Two feedback terminals 14 are connected;

One end of the second switch element K2 is respectively connected to the second end of the auxiliary light emitting diode D1 and the first end of the second sub-light-emitting group 24, and the other end of the second switch element K2 is connected to the output端12连接。 12 connection.

Since an auxiliary diode is inserted in the middle of the light-emitting group 20, when Vin is equal to a preset voltage, such as 5V, the switches K1 and K2 are closed at this time. At this time, the first sub-light-emitting group 23 is connected to the second feedback terminal 14 through K1. The second sub-light-emitting group 24 is connected to the first feedback terminal 13 through K2, which is divided into two branches. K1 and 23 form the first branch, and K2 and 24 form the second branch. Due to the reduction of a single branch The number of light-emitting elements in the middle reduces the voltage difference between the output voltage and the input voltage, thereby increasing the energy conversion efficiency. Both the first sub-light-emitting group 23 and the second sub-light-emitting group 24 include at least one light-emitting element 21. Of course, it is understandable that the branch module can also divide the light-emitting group into more sub-light-emitting groups, thereby forming more branches.

In a preferred embodiment, in order to improve the brightness uniformity of the backlight light source, the total number of light-emitting elements 21 in the first sub-light-emitting group 23 and the total number of light-emitting elements 21 in the second sub-light-emitting group 24 are between The difference is less than or equal to 1. In other words, the total number of light-emitting elements 21 in the first sub-light-emitting group 23 is equal to or different from the total number of light-emitting elements 21 in the second sub-light-emitting group 24.

In one embodiment, when the total number of light-emitting elements 21 in the first sub-light-emitting group 23 is equal to the total number of light-emitting elements 21 in the second sub-light-emitting group 24, the auxiliary light-emitting diode D1 is located in the The middle position of the light-emitting group 20. Taking the number of sub-light-emitting groups as two as an example, when the light-emitting elements in each light-emitting group are even-numbered, the auxiliary light-emitting diode D1 is located in the middle position of the corresponding light-emitting group 20.

In another embodiment, as shown in FIG. 4, when the total number of light-emitting elements in the first sub-light-emitting group 23 is not equal to the total number of light-emitting elements in the second sub-light-emitting group 24, the auxiliary The light emitting diode D1 is located on one of the two sides of the light emitting element D0 of the corresponding light emitting group, and the light emitting element D0 is set to the light emitting element 21 located in the middle of the light emitting group 20, such as from left to right or from The fourth light-emitting element from right to left is the set light-emitting element D0. Taking the number of sub-light-emitting groups as an example, when the number of light-emitting elements in each light-emitting group is an odd number, the auxiliary light-emitting diode D1 is located on the left side of the set light-emitting element D0 of the corresponding light-emitting group. Of course, it is understandable that the auxiliary light-emitting diode D1 may also be located on the right side of the set light-emitting element D0 of the corresponding light-emitting group.

As shown in FIG. 5, in one embodiment, when the total number of light-emitting elements 21 in the first sub-light-emitting group 23 is greater than the total number of light-emitting elements in the second sub-light-emitting group 24, the second sub-light-emitting group 24 The light-emitting group 24 further includes an additional light-emitting diode D2, and the additional light-emitting diode D2 is connected in series in the second sub-light-emitting group 24. For example, the anode of the additional light-emitting diode D2 is connected to the cathode of the auxiliary light-emitting diode D1, and the cathode of the additional light-emitting diode D2 is connected to the anode of the rightmost light-emitting element in the second sub-light-emitting group 24. Of course, it is understandable that when the total number of light-emitting elements 21 in the first sub-light-emitting group 23 is less than the total number of light-emitting elements in the second sub-light-emitting group 24, the first sub-light-emitting group 23 may also Including additional light-emitting diodes, the specific connection method is similar to this, and will not be repeated here.

In a preferred embodiment, in order to improve the simplified manufacturing process, the additional light emitting diode D2 is close to the auxiliary light emitting diode D1.

2 to 5, two light-emitting groups and two sub-light-emitting groups are taken as examples for description, but the present invention is not limited. In other embodiments, the number of light-emitting groups is not limited to this, and the number of sub-light-emitting groups can also be three or more. An embodiment of the present invention also provides a backlight module 100, which includes the driving circuit 40 described in any one of the above. The backlight module 100 further includes at least one light-emitting group 20; the light-emitting group 20 includes a plurality of light-emitting elements 21 connected in series.

As shown in FIG. 6, an embodiment of the present invention also provides a display device 200, which includes the above-mentioned backlight module 100. In addition, the display device 200 may further include a liquid crystal display panel 120. side. In addition, the display device 200 includes, but is not limited to, mobile phones, tablet computers, computer monitors, game consoles, televisions, display screens, wearable devices, and other household appliances or household appliances with display functions.

The driving circuit, the backlight module, and the display device of the embodiments of the present application include a converter, including an input terminal, an output terminal, at least one first feedback terminal, and at least one second feedback terminal. The input terminal is connected to a first power supply voltage , The output terminal is used to output the second power supply voltage; at least one branch module, the branch module is used to divide the corresponding light-emitting group into at least a first sub-light-emitting group and a second sub-light-emitting group, the branch modules are respectively connected with Correspondingly, the second end of the first sub-light-emitting group is connected, the first end of the second sub-light-emitting group, and the second feedback end are connected to the output end, and the second end of the second sub-light-emitting group is connected to the output end. The first feedback terminal is connected; the output terminal is connected to the first terminal of the first sub-light-emitting group; wherein the branch module is respectively connected to the light-emitting group, the first feedback terminal, and the second feedback Corresponding to the end; due to the addition of branch modules, a single light-emitting group is divided into at least two sub-light-emitting groups, thereby reducing the number of light-emitting elements in a single branch, thereby reducing the voltage difference between the output voltage and the input voltage, Thereby improving the energy conversion efficiency of the converter and the driving effect of the driving circuit. The drive circuit, backlight module, and display device provided by the embodiments of the present application are described in detail above. Specific examples are used in this article to illustrate the principles and implementations of the present application. The description of the above embodiments is only used to help understand the present application. . At the same time, for those skilled in the art, based on the idea of the application, there will be changes in the specific implementation and the scope of application. In summary, the content of this specification should not be construed as a limitation to the application.

Claims

A drive circuit, wherein the drive circuit is used to drive a backlight module, wherein the backlight module includes at least one light-emitting group; the light-emitting group includes a plurality of light-emitting elements connected in series;

The driving circuit includes:

The converter includes an input terminal, an output terminal, at least one first feedback terminal, and at least one second feedback terminal, the input terminal is connected to a first power supply voltage, and the output terminal is used to output a second power supply voltage;

At least one branch module, the branch module is used to divide the corresponding light-emitting group into at least a first sub-light-emitting group and a second sub-light-emitting group, and the branch modules are respectively connected to the corresponding second end of the first sub-light-emitting group Connection, the first end of the second sub-light-emitting group, the second feedback end, and the output end are connected, and the second end of the second sub-light-emitting group is connected to the first feedback end; the output The terminal is also connected to the first terminal of the first sub-light-emitting group; wherein the branch module corresponds to the light-emitting group, the first feedback terminal, and the second feedback terminal, respectively.
The driving circuit according to claim 1, wherein the branched module comprises:

Auxiliary light-emitting diode;

The first switching element, one end of the first switching element is respectively connected to the first end of the auxiliary light-emitting diode and the second end of the first sub-light-emitting group; the other end of the first switching element is connected to the The second feedback terminal is connected;

The second switching element, one end of the second switching element is respectively connected to the second end of the auxiliary light-emitting diode and the first end of the second sub-light-emitting group, and the other end of the second switching element is connected to the The output terminal is connected.
The driving circuit according to claim 1, wherein

The branch modules respectively correspond to the light-emitting group, the first feedback terminal, and the second feedback terminal in a one-to-one correspondence.
The driving circuit according to claim 1, wherein the first sub-light-emitting group and the second sub-light-emitting group each include at least one light-emitting element;

The difference between the total number of light-emitting elements in the first sub-light-emitting group and the total number of light-emitting elements in the second sub-light-emitting group is less than or equal to 1.
The driving circuit according to claim 4, wherein

When the total number of light-emitting elements in the first sub-light-emitting group is equal to the total number of light-emitting elements in the second sub-light-emitting group, the auxiliary light-emitting diode is located in the middle position of the corresponding light-emitting group.
The driving circuit according to claim 4, wherein

When the total number of light-emitting elements in the first sub-light-emitting group is not equal to the total number of light-emitting elements in the second sub-light-emitting group, the auxiliary light-emitting diodes are located on both sides of the set light-emitting elements of the corresponding light-emitting group On one side of the light-emitting group, the set light-emitting element is a light-emitting element located in the middle of the light-emitting group.
The driving circuit according to claim 6, wherein

When the total number of light-emitting elements in the first sub-light-emitting group is greater than the total number of light-emitting elements in the second sub-light-emitting group, the second sub-light-emitting group further includes additional light-emitting diodes, and the additional light-emitting diodes are connected in series In the second sub-light-emitting group.
The driving circuit according to claim 7, wherein

The additional light emitting diode is close to the auxiliary light emitting diode.
A backlight module includes a driving circuit for driving the backlight module, wherein the backlight module includes at least one light-emitting group; the light-emitting group includes a plurality of light-emitting elements connected in series;

The driving circuit includes:

The converter includes an input terminal, an output terminal, at least one first feedback terminal and at least one second feedback terminal, the input terminal is connected to a first power supply voltage, and the output terminal is used to output a second power supply voltage; and

At least one branch module, the branch module is used to divide the corresponding light-emitting group into at least a first sub-light-emitting group and a second sub-light-emitting group, and the branch modules are respectively connected to the corresponding second end of the first sub-light-emitting group Connection, the first end of the second sub-light-emitting group, the second feedback end, and the output end are connected, and the second end of the second sub-light-emitting group is connected to the first feedback end; the output The terminal is also connected to the first terminal of the first sub-light-emitting group; wherein the branch module corresponds to the light-emitting group, the first feedback terminal, and the second feedback terminal, respectively.
The backlight module of claim 9, wherein the branched module comprises:

Auxiliary light-emitting diode;

The first switching element, one end of the first switching element is respectively connected to the first end of the auxiliary light-emitting diode and the second end of the first sub-light-emitting group; the other end of the first switching element is connected to the The second feedback terminal is connected; and

The second switching element, one end of the second switching element is respectively connected to the second end of the auxiliary light-emitting diode and the first end of the second sub-light-emitting group, and the other end of the second switching element is connected to the The output terminal is connected.
The backlight module of claim 9, wherein

The branch modules respectively correspond to the light-emitting group, the first feedback terminal, and the second feedback terminal in a one-to-one correspondence.
9. The backlight module according to claim 9, wherein the first sub-light-emitting group and the second sub-light-emitting group each comprise at least one light-emitting element;

The difference between the total number of light-emitting elements in the first sub-light-emitting group and the total number of light-emitting elements in the second sub-light-emitting group is less than or equal to 1.
The backlight module of claim 12, wherein

When the total number of light-emitting elements in the first sub-light-emitting group is equal to the total number of light-emitting elements in the second sub-light-emitting group, the auxiliary light-emitting diode is located in the middle position of the corresponding light-emitting group.
The backlight module of claim 12, wherein

When the total number of light-emitting elements in the first sub-light-emitting group is not equal to the total number of light-emitting elements in the second sub-light-emitting group, the auxiliary light-emitting diodes are located on both sides of the set light-emitting elements of the corresponding light-emitting group On one side of the light-emitting group, the set light-emitting element is a light-emitting element located in the middle of the light-emitting group.
The backlight module of claim 14, wherein

When the total number of light-emitting elements in the first sub-light-emitting group is greater than the total number of light-emitting elements in the second sub-light-emitting group, the second sub-light-emitting group further includes additional light-emitting diodes, and the additional light-emitting diodes are connected in series In the second sub-light-emitting group.
The backlight module of claim 15, wherein

The additional light emitting diode is close to the auxiliary light emitting diode.
A display device includes a backlight module, which includes a driving circuit for driving the backlight module, wherein the backlight module includes at least one light-emitting group; the light-emitting group includes a plurality of light-emitting elements connected in series;

The driving circuit includes:

The converter includes an input terminal, an output terminal, at least one first feedback terminal and at least one second feedback terminal, the input terminal is connected to a first power supply voltage, and the output terminal is used to output a second power supply voltage; and

At least one branch module, the branch module is used to divide the corresponding light-emitting group into at least a first sub-light-emitting group and a second sub-light-emitting group, and the branch modules are respectively connected to the corresponding second end of the first sub-light-emitting group Connection, the first end of the second sub-light-emitting group, the second feedback end, and the output end are connected, and the second end of the second sub-light-emitting group is connected to the first feedback end; the output The terminal is also connected to the first terminal of the first sub-light-emitting group; wherein the branch module corresponds to the light-emitting group, the first feedback terminal, and the second feedback terminal respectively.
The display device according to claim 17, wherein the branched module comprises:

Auxiliary light-emitting diode;

The first switching element, one end of the first switching element is respectively connected to the first end of the auxiliary light-emitting diode and the second end of the first sub-light-emitting group; the other end of the first switching element is connected to the The second feedback terminal is connected; and

The second switching element, one end of the second switching element is respectively connected to the second end of the auxiliary light-emitting diode and the first end of the second sub-light-emitting group, and the other end of the second switching element is connected to the The output terminal is connected.
18. The display device according to claim 17, wherein the first sub-light-emitting group and the second sub-light-emitting group each comprise at least one light-emitting element;

The difference between the total number of light-emitting elements in the first sub-light-emitting group and the total number of light-emitting elements in the second sub-light-emitting group is less than or equal to 1.
The display device according to claim 19, wherein

When the total number of light-emitting elements in the first sub-light-emitting group is equal to the total number of light-emitting elements in the second sub-light-emitting group, the auxiliary light-emitting diode is located in the middle position of the corresponding light-emitting group.