Backlight control circuit, backlight module, and display device

Abstract

A backlight control circuit, a backlight module, and a display device, relating to the technical field of display. The backlight control circuit comprises a main power supply (101), a power supply converter (102), a first connector (1031), and a second connector (1032). The main power supply (101) is connected to an input end (VBL) of the power supply converter (102); a first voltage end of the power supply converter (102) is connected to a first port of the first connector (1031), and a second voltage end of the power supply converter (102) is connected to a second port of the second connector (1032), and a second port of the first connector (1031) is connected to a first port of the second connector (1032); the first port of the first connector (1031) is connected to a first electrode of a first backlight circuit (1041) to be driven, and the second port of the first connector (1031) is connected to a second electrode of a first backlight circuit (1042) to be driven; and the first port of the second connector (1032) is connected to a first electrode of a second backlight circuit (1042) to be driven, and the second port of the second connector (1032) is connected to a second electrode of the second backlight circuit (1042) to be driven. The backlight control circuit, the backlight module, and the display device solve the problems of a large amount of electronic components and high cost of existing backlight control circuits.

Description

Backlight control circuit, backlight module and display device Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a backlight control circuit, a backlight module, and a display device. Background Art

[0002] Switching power supplies, with their high efficiency, compact size, and stable voltage output, have found widespread use in electronic product power supply systems. For example, in televisions, the backlight control circuitry uses a switching power supply to provide power to the backlight circuitry. The backlight module has two backlight circuits. Current backlight control circuits require two 81.2V-92.4V / 500mA current loops, requiring numerous electronic components and hindering product cost control. Furthermore, the driving currents in these two current loops can vary, leading to inconsistent currents and resulting in varying brightness in the backlight module, impacting display quality.

[0003] Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art, and provides a backlight control circuit, a backlight module and a display device.

[0005] In a first aspect, an embodiment of the present disclosure provides a backlight control circuit, wherein the backlight control circuit includes: a main power supply, a power converter, a first connector, and a second connector;

[0006] The main power supply is connected to the input end of the power converter;

[0007] The first voltage terminal of the power converter is connected to the first port of the first connector, the second voltage terminal is connected to the second port of the second connector, and the second port of the first connector is connected to the first port of the second connector;

[0008] The first port of the first connector is connected to the first electrode of the first backlight circuit to be driven, and the second port is connected to the second electrode of the first backlight circuit to be driven;

[0009] The first port of the second connector is connected to the first electrode of the second backlight circuit to be driven, and the second port is connected to the second electrode of the second backlight circuit to be driven.

[0010] Optionally, the power converter includes: an energy storage subcircuit, a load subcircuit and a regulation subcircuit;

[0011] The energy storage subcircuit is configured to store the first DC voltage provided by the main power supply and convert the first DC voltage into a second DC voltage;

[0012] The load subcircuit is configured to introduce a second DC voltage into the ground terminal to form a current loop;

[0013] The regulating subcircuit is configured to adjust the duty cycle of the control signal according to the current in the current loop to regulate the second DC voltage.

[0014] Optionally, the energy storage subcircuit includes: a first diode, a first capacitor and an energy storage inductor;

[0015] One end of the first diode is connected to the first node, and the other end is connected to the input end;

[0016] One end of the first capacitor is connected to the input end, and the other end is connected to one end of the energy storage inductor;

[0017] One end of the energy storage inductor is connected to the other end of the first capacitor, and the other end is connected to the first node.

[0018] Optionally, the regulating subcircuit includes: a first resistor, a second resistor, a third resistor, a second diode, a first switching transistor, and a second switching transistor;

[0019] One end of the first resistor is connected to the control signal input end, and the other end is connected to one end of the second diode and the control electrode of the first switching transistor;

[0020] One end of the second diode is connected to the other end of the first resistor, and the other end is connected to one end of the second resistor;

[0021] One end of the second resistor is connected to the other end of the second diode, and the other end is connected to the control electrode of the first switching transistor;

[0022] The control electrode of the first switch transistor is connected to the other end of the second resistor, the first electrode is connected to the first node, and the second electrode is connected to the second node;

[0023] The control electrode of the second switch transistor is connected to one end of the second diode, the first electrode is connected to the other end of the second diode, and the other end is connected to the second node;

[0024] One end of the third resistor is connected to the other end of the second resistor, and a second electrode is connected to the second node.

[0025] Optionally, the load sub-circuit includes: a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;

[0026] One end of the fourth resistor, the fifth resistor, the sixth resistor, and the seventh resistor are all connected to the second node, and the other ends are all connected to the ground.

[0027] Optionally, the power converter further comprises: a spike suppression subcircuit;

[0028] The spike suppression subcircuit is configured to suppress a voltage spike of the second DC voltage.

[0029] Optionally, the spike suppression subcircuit includes: a second capacitor, an eighth resistor, and a ninth resistor;

[0030] One end of the second capacitor is connected to the first node, and the other end is connected to one end of the eighth resistor and the ninth resistor;

[0031] One end of the eighth resistor and the ninth resistor are both connected to the other end of the second capacitor, and the other end is connected to the second node.

[0032] Optionally, the power converter further comprises: a filtering subcircuit;

[0033] The filtering sub-circuit is configured to filter a first DC voltage provided by the main power supply.

[0034] Optionally, the filtering subcircuit includes: a third capacitor;

[0035] One end of the third capacitor is connected to the input end, and the other end is connected to the ground end.

[0036] In a second aspect, an embodiment of the present disclosure provides a backlight module, wherein the backlight module includes the backlight control circuit provided above.

[0037] Optionally, the backlight module further includes: a first backlight circuit and a second backlight circuit;

[0038] The first electrode of the first backlight circuit is connected to the first port of the first connector, and the second electrode is connected to the second port of the first connector;

[0039] The first electrode of the first backlight circuit is connected to the first port of the second connector, and the second electrode is connected to the second port of the second connector.

[0040] In a third aspect, an embodiment of the present disclosure provides a display device, wherein the display device includes a liquid crystal display panel and a backlight module as provided above. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic structural diagram of an exemplary backlight control circuit.

[0042] FIG. 2 a is a schematic diagram of a current loop of the backlight control circuit shown in FIG. 1 .

[0043] FIG2b is another current loop diagram of the backlight control circuit shown in FIG1

[0044] FIG3 is a schematic structural diagram of a backlight control circuit provided by an embodiment of the present disclosure.

[0045] FIG. 4 a is a schematic diagram of a current loop of the backlight control circuit shown in FIG. 3 .

[0046] FIG. 4 b is another current loop schematic diagram of the backlight control circuit shown in FIG. 3 . DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0048] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0049] It should be noted that the transistors in the embodiments of the present disclosure may be thin film transistors or field effect transistors or other switching devices with the same characteristics. The thin film transistors may include oxide semiconductor thin film transistors, amorphous silicon thin film transistors or polycrystalline silicon thin film transistors, etc. The source and drain of the transistor may be symmetrical in structure, so the source and drain may be indistinguishable in physical structure. In the embodiments of the present disclosure, in order to distinguish the transistors, except for the gate as the control electrode, one of the electrodes is directly described as the first electrode and the other electrode is directly described as the second electrode, so the first electrode and the second electrode of all or part of the transistors in the embodiments of the present disclosure can be interchangeable as needed.

[0050] It should be noted that a thin film transistor can be either an N-type thin film transistor or a P-type thin film transistor; an N-type thin film transistor refers to a thin film transistor in which an N-type ion is doped in its active layer; a P-type thin film transistor refers to a thin film transistor in which a P-type ion is doped in its active layer. The operating level signal of an N-type thin film transistor is a high-level signal; the operating level signal of a P-type thin film transistor is a low-level signal. For ease of understanding, the following embodiments of the present disclosure are described using an N-type thin film transistor as an example, but the present disclosure is not limited to N-type thin film transistors.

[0051] FIG1 is a schematic diagram of the structure of an exemplary backlight control circuit. As shown in FIG1 , the backlight control circuit includes: a main power supply 101, a power converter 102, and a connector 103. Since the backlight circuit 104 in the backlight module is two-way, namely, a first backlight circuit 1041 and a second backlight circuit 1042, the number of power converters 102 and connectors 103 in the backlight control circuit is correspondingly two, namely, a first power converter 1021, a second power converter 1022, a first connector 1031, and a second connector 1032.

[0052] The main power supply 101 is connected to the input terminal VBL of the first power converter 1021 and the second power converter 1022; the first voltage terminal of the first power converter 1021 is connected to the first port of the first connector 1031, and the second voltage terminal is connected to the second port of the first connector 1031; the first voltage terminal of the second power converter 1022 is connected to the first port of the second connector 1032, and the second voltage terminal is connected to the second port of the second connector 1032; the first port of the first connector 1031 is connected to the first electrode of the first backlight circuit 1041 to be driven, and the second port is connected to the second electrode of the first backlight circuit 1042 to be driven; the first port of the second connector 1032 is connected to the first electrode of the second backlight circuit 1042 to be driven, and the second port is connected to the second electrode of the second backlight circuit 1042 to be driven.

[0053] As shown in FIG1 , the first power converter 1021 includes: an energy storage subcircuit, a load subcircuit, and a regulation subcircuit. Specifically, the energy storage subcircuit includes: a first diode PD3, a first capacitor PCE11, and an energy storage inductor PL6; one end of the first diode PD3 is connected to the first node N1, and the other end is connected to the input terminal VBL; one end of the first capacitor PCE11 is connected to the input terminal VBL, and the other end is connected to one end of the energy storage inductor PL6; one end of the energy storage inductor PL6 is connected to the other end of the first capacitor PCE11, and the other end is connected to the first node N1. The regulation subcircuit includes: a first resistor PR43, a second resistor PR44, a third resistor PR73, a second diode PD21, a first switching transistor PQ2 and a second switching transistor PQ9; one end of the first resistor PR43 is connected to the control signal input terminal GATE1, and the other end is connected to one end of the second diode PD21 and the gate of the first switching transistor PQ2; one end of the second diode PD21 is connected to the other end of the first resistor PR43, and the other end is connected to one end of the second resistor PR44; one end of the second resistor PR44 is connected to the other end of the second diode PD21, and the other end is connected to the gate of the first switching transistor PQ2; the gate of the first switching transistor PQ2 is connected to the other end of the second resistor PR44, the source is connected to the first node N1, and the drain is connected to the second node N2; the gate of the second switching transistor PQ9 is connected to one end of the second diode PD21, the source is connected to the other end of the second diode PD21, and the drain is connected to the second node N2; one end of the third resistor PR73 is connected to the other end of the second resistor PR44, and the other end is connected to the second node N2. The load sub-circuit includes: a fourth resistor PR85, a fifth resistor PR86, a sixth resistor PR83 and a seventh resistor PR90; one end of the fourth resistor PR85, the fifth resistor PR86, the sixth resistor PR83 and the seventh resistor PR90 are all connected to the second node N2, and the other end is connected to the ground terminal GND.

[0054] The first power converter 1021 also includes a spike suppression subcircuit. Specifically, the spike suppression subcircuit includes a second capacitor PC36, an eighth resistor PR75, and a ninth resistor PR82. One end of the second capacitor PC36 is connected to the first node N1, and the other end is connected to one end of the eighth resistor PR75 and the ninth resistor PR82. One end of each of the eighth resistor PR75 and the ninth resistor PR82 is connected to the other end of the second capacitor PC36, and the other end is connected to the second node N2. The first power converter 1021 also includes a filtering subcircuit. Specifically, the filtering subcircuit includes a third capacitor PC33. One end of the third capacitor PC33 is connected to the input terminal VBL, and the other end is connected to the ground terminal GND.

[0055] It should be noted that the structure and connection method of the second power converter 1022 are the same as those of the first power converter 1021 , and will not be described in detail here.

[0056] FIG2a is a schematic diagram of a current loop of the backlight control circuit shown in FIG1 , and FIG2b is a schematic diagram of another current loop of the backlight control circuit shown in FIG1 . The working principle of the backlight control circuit shown in FIG1 will be further described in detail below in combination with FIG2a and FIG2b .

[0057] As shown in Figure 2a, the main power supply 101 receives a first DC voltage through the input terminal VBL. After filtering by the third capacitor PC33, a clean 162.4V-184.8sV / 500mA power supply is generated. When the first switching transistor PQ2 is turned on, the main power supply 101 supplies power to the first backlight circuit 1041 and the second backlight circuit 1042 through the first connector 1031 and the second connector 1032. The energy storage inductor PL6 stores energy, the current increases linearly, and the first capacitor PCE11 is charged. The first DC voltage can also be converted into a second DC voltage to meet the voltage requirements of the first backlight circuit 1041.

[0058] As shown in FIG2b , when the first switching transistor PQ2 is turned off, the energy storage inductor PL6 releases the stored energy to the first backlight circuit 1041 and the second backlight circuit 1042 through the first diode PD3 due to the inductive characteristics of the inductor, and the first capacitor PCE11 also supplies power to the first backlight circuit 1041.

[0059] It should be noted that the working principle of the second power converter 1022 is the same as that of the first power converter 1021 , and will not be described in detail here.

[0060] As can be seen, the first backlight circuit 1041 and the second backlight circuit 1042 to be driven are connected by the first connector 1031 and the second connector 1032 to form a parallel circuit. These circuits require a first power converter 1021 and a second power converter 1022 to provide DC voltages, respectively. This requires a large number of power converters 102 and electronic components, hindering product cost control. Furthermore, the first backlight circuit 1041 and the second backlight circuit 1042 to be driven form a parallel circuit. The driving currents in the two current loops have a certain deviation, resulting in inconsistent currents and a brightness difference in the backlight module, affecting the display effect.

[0061] In order to solve at least one of the above-mentioned technical problems, the embodiments of the present disclosure provide a backlight control circuit, a backlight module and a display device. The backlight control circuit, the backlight module and the display device provided by the embodiments of the present disclosure will be further described in detail below in combination with the accompanying drawings and specific implementation methods.

[0062] In a first aspect, embodiments of the present disclosure provide a backlight control circuit. FIG3 is a schematic structural diagram of a backlight control circuit provided by an embodiment of the present disclosure. As shown in FIG3 , the backlight control circuit includes a main power supply 101, a power converter 102, and a connector 103. Since the backlight circuit 104 in the backlight module is two-way, namely, a first backlight circuit 1041 and a second backlight circuit 1042, the number of connectors 103 in the backlight control circuit can be two, namely, a first connector 1031 and a second connector 1032.

[0063] The main power supply 101 is connected to the input terminal VBL of the power converter 102; the first voltage terminal of the power converter 102 is connected to the first port of the first connector 1031, the second voltage terminal is connected to the second port of the second connector 1032, and the second port of the first connector 1031 is connected to the first port of the second connector 1032; the first port of the first connector 1031 is connected to the first electrode of the first backlight circuit 1041 to be driven, and the second port is connected to the second electrode of the first backlight circuit 1041 to be driven; the first port of the second connector 1032 is connected to the first electrode of the second backlight circuit 1042 to be driven, and the second port is connected to the second electrode of the second backlight circuit 1042 to be driven.

[0064] It should be noted that both the first connector 1031 and the second connector 1032 can be provided with multiple redundant ports. In practical applications, the redundant ports can be suspended to meet the size requirements of the first backlight circuit 1041 and the second backlight circuit 1042. The number of redundant ports can be set according to actual needs and is not listed here one by one.

[0065] In the backlight control circuit provided in the embodiment of the present disclosure, the first backlight circuit 1041 to be driven and the second backlight circuit 1042 are connected by a first connector 1031 and a second connector 1032 to form a series circuit. Only one power converter 102 is required to provide a DC voltage. Compared with the backlight control circuit in the related art, the number of power converters 102 can be reduced, and the number of electronic components required can be reduced, which is beneficial to product cost control. At the same time, the first backlight circuit 1041 to be driven and the second backlight circuit 1042 to be driven form a series circuit. The driving current in the current loops of the two is the same, which can ensure that the brightness of each area in the backlight module is consistent, avoid brightness differences, and thus improve the display effect.

[0066] In some embodiments, as shown in FIG3 , the power converter 102 includes: an energy storage subcircuit, a load subcircuit, and a regulation subcircuit.

[0067] The energy storage subcircuit is configured to store the first DC voltage provided by the main power supply 101 and convert the first DC voltage into a second DC voltage; the load subcircuit is configured to introduce the second DC voltage into the ground terminal GND to form a current loop; the regulation subcircuit is configured to adjust the duty cycle of the control signal according to the current in the current loop to adjust the second DC voltage.

[0068] Specifically, the energy storage subcircuit includes: a first diode PD3, a first capacitor PCE11 and an energy storage inductor PL6; one end of the first diode PD3 is connected to the first node N1, and the other end is connected to the input end VBL; one end of the first capacitor PCE11 is connected to the input end VBL, and the other end is connected to one end of the energy storage inductor PL6; one end of the energy storage inductor PL6 is connected to the other end of the first capacitor PCE11, and the other end is connected to the first node N1.

[0069] The regulation subcircuit includes: a first resistor PR43, a second resistor PR44, a third resistor PR73, a second diode PD21, a first switching transistor PQ2 and a second switching transistor PQ9; one end of the first resistor PR43 is connected to the control signal input terminal GATE1, and the other end is connected to one end of the second diode PD21 and the gate of the first switching transistor PQ2; one end of the second diode PD21 is connected to the other end of the first resistor PR43, and the other end is connected to one end of the second resistor PR44; one end of the second resistor PR44 is connected to the other end of the second diode PD21, and the other end is connected to the gate of the first switching transistor PQ2; the gate of the first switching transistor PQ2 is connected to the other end of the second resistor PR44, the source is connected to the first node N1, and the drain is connected to the second node N2; the gate of the second switching transistor PQ9 is connected to one end of the second diode PD21, the source is connected to the other end of the second diode PD21, and the drain is connected to the second node N2; one end of the third resistor PR73 is connected to the other end of the second resistor PR44, and the other end is connected to the second node N2.

[0070] The load sub-circuit includes: a fourth resistor PR85, a fifth resistor PR86, a sixth resistor PR83 and a seventh resistor PR90; one end of the fourth resistor PR85, the fifth resistor PR86, the sixth resistor PR83 and the seventh resistor PR90 are all connected to the second node N2, and the other end is connected to the ground terminal GND.

[0071] In some embodiments, the power converter 102 further includes a spike suppression sub-circuit configured to suppress a voltage spike of the second DC voltage.

[0072] Specifically, the spike suppression subcircuit includes: a second capacitor PC36, an eighth resistor PR75 and a ninth resistor PR82; one end of the second capacitor PC36 is connected to the first node N1, and the other end is connected to one end of the eighth resistor PR75 and the ninth resistor PR82; one end of the eighth resistor PR75 and the ninth resistor PR82 are both connected to the other end of the second capacitor PC36, and the other end is connected to the second node N2.

[0073] In some embodiments, the power converter 102 further includes a filtering sub-circuit configured to filter the first DC voltage provided by the main power source 101 .

[0074] Specifically, the filtering sub-circuit includes: a third capacitor PC33; one end of the third capacitor PC33 is connected to the input terminal VBL, and the other end is connected to the ground terminal GND.

[0075] The backlight control circuit provided in the embodiment of the present disclosure is a step-down conversion circuit (Buck circuit), in which the power converter 102 is a DC-DC conversion circuit (DC-DC conversion circuit), and the output voltage is lower than the input voltage. The input current is pulsating, and the output current is continuous. The Buck circuit uses a first switching transistor PQ2 to "chop" the input DC power supply to form a square wave. A square wave is used to control the first switching transistor PQ2 so that the first switching transistor PQ2 is turned on and off according to the control signal, and the energy passing through can be controlled by adjusting the duty cycle of the square wave. The square wave passing through the first switching transistor PQ2 is then low-pass filtered to output a DC voltage, that is, the first DC voltage is converted into a second DC voltage.

[0076] As can be seen from the above, the structure of the backlight control circuit provided by the embodiment of the present disclosure is relatively streamlined, and the dual-path constant current output mode is simplified. Compared with the backlight control circuit in the related art, the main power devices and other supporting circuits such as 1 first switching transistor, 1 energy storage inductor, 1 first diode, and 1 first capacitor are omitted, and the number of peripheral devices is also greatly reduced. Not only does it reduce the cost, but also the reliability of the circuit (the more devices, the worse the reliability) and the smoothness of the wiring can be greatly improved, which is beneficial to the cost control of the product. At the same time, the first backlight circuit 1041 and the second backlight circuit 1042 to be driven form a series circuit, and the driving current in the current loop of the two is the same, which can ensure that the brightness of each area in the backlight module is consistent, avoid brightness differences, and thus improve the display effect.

[0077] FIG4a is a schematic diagram of a current loop of the backlight control circuit shown in FIG3 , and FIG4b is a schematic diagram of another current loop of the backlight control circuit shown in FIG3 . The working principle of the backlight control circuit shown in FIG3 will be further described in detail below in combination with FIG4a and FIG4b .

[0078] As shown in Figure 4a, the main power supply 101 receives a first DC voltage through the input terminal VBL. After filtering by the third capacitor PC33, a clean 162.4V-184.8sV / 500mA power supply is obtained. When the first switching transistor PQ2 is turned on, the main power supply 101 supplies power to the first backlight circuit 1041 and the second backlight circuit 1042 through the first connector 1031 and the second connector 1032. The energy storage inductor PL6 stores energy, the current increases linearly, and the first capacitor PCE11 is charged. The first DC voltage can also be converted into a second DC voltage to meet the voltage requirements of the first backlight circuit 1041 and the second backlight circuit 1042.

[0079] As shown in FIG4b , when the first switching transistor PQ2 is turned off, the energy stored in the energy storage inductor PL6 releases energy to the first backlight circuit 1041 and the second backlight circuit 1042 through the first diode PD3 due to the inductive characteristics of the inductor. At the same time, the first capacitor PCE11 also supplies power to the first backlight circuit 1041 and the second backlight circuit 1042.

[0080] The specifications of the first switching transistor PQ2 can be 8A / 250V, and the specifications of the first diode PD3 can be 5A / 400V. The specifications of these two devices remain unchanged compared to those of devices in the related art. The voltage specification required by the main power supply 101 is the sum of the voltages of the first backlight circuit 1041 and the second backlight circuit 1042, and the current specification is equal to the current of the first backlight circuit 1041 and the second backlight circuit 1042.

[0081] In a second aspect, embodiments of the present disclosure provide a backlight module, comprising a backlight control circuit as provided in any of the aforementioned embodiments, and further comprising: a first backlight circuit and a second backlight circuit; a first electrode of the first backlight circuit connected to a first port of a first connector, and a second electrode connected to a second port of the first connector; and a first electrode of the first backlight circuit connected to a first port of a second connector, and a second electrode connected to a second port of the second connector. The implementation principles of these backlight control circuits are the same as those of the backlight control circuits provided in any of the aforementioned embodiments, and are not further described herein.

[0082] Thirdly, embodiments of the present disclosure provide a display device comprising a backlight module and backlight control circuit as provided in any of the aforementioned embodiments. The display device can be any product or component with a display function, such as a television, mobile phone, monitor, laptop computer, digital photo frame, or navigation system. The implementation principles of the display device are similar to those of the aforementioned backlight module and backlight control circuit and will not be further elaborated here.

[0083] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A backlight control circuit, wherein: The backlight control circuit includes: a main power supply, a power converter, a first connector and a second connector; The main power supply is connected to the input end of the power converter; The first voltage terminal of the power converter is connected to the first port of the first connector, the second voltage terminal is connected to the second port of the second connector, and the second port of the first connector is connected to the first port of the second connector; The first port of the first connector is connected to the first electrode of the first backlight circuit to be driven, and the second port is connected to the second electrode of the first backlight circuit to be driven; The first port of the second connector is connected to the first electrode of the second backlight circuit to be driven, and the second port is connected to the second electrode of the second backlight circuit to be driven.

2. The backlight control circuit according to claim 1, wherein: The power converter includes: an energy storage subcircuit, a load subcircuit and a regulation subcircuit; The energy storage subcircuit is configured to store the first DC voltage provided by the main power supply and convert the first DC voltage into a second DC voltage; The load subcircuit is configured to introduce the second DC voltage into the ground terminal to form a current loop; The regulating subcircuit is configured to adjust the duty cycle of the control signal according to the current in the current loop to regulate the second DC voltage.

3. The backlight control circuit according to claim 2, wherein: The energy storage subcircuit includes: a first diode, a first capacitor and an energy storage inductor; One end of the first diode is connected to the first node, and the other end is connected to the input end; One end of the first capacitor is connected to the input end, and the other end is connected to one end of the energy storage inductor; One end of the energy storage inductor is connected to the other end of the first capacitor, and the other end is connected to the first node.

4. The backlight control circuit according to claim 2, wherein: The regulating subcircuit includes: a first resistor, a second resistor, a third resistor, a second diode, a first switching transistor and a second switching transistor; One end of the first resistor is connected to the control signal input end, and the other end is connected to one end of the second diode and the control electrode of the first switching transistor; One end of the second diode is connected to the other end of the first resistor, and the other end is connected to one end of the second resistor; One end of the second resistor is connected to the other end of the second diode, and the other end is connected to the control electrode of the first switching transistor; The control electrode of the first switch transistor is connected to the other end of the second resistor, the first electrode is connected to the first node, and the second electrode is connected to the second node; The control electrode of the second switch transistor is connected to one end of the second diode, the first electrode is connected to the other end of the second diode, and the other end is connected to the second node; One end of the third resistor is connected to the other end of the second resistor, and a second electrode is connected to the second node.

5. The backlight control circuit according to claim 2, wherein: The load sub-circuit includes: a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor; One end of the fourth resistor, the fifth resistor, the sixth resistor, and the seventh resistor are all connected to the second node, and the other ends are all connected to the ground.

6. The backlight control circuit according to claim 2, wherein: The power converter further includes: a spike suppression subcircuit; The spike suppression subcircuit is configured to suppress a voltage spike of the second DC voltage.

7. The backlight control circuit according to claim 6, wherein: The spike suppression subcircuit includes: a second capacitor, an eighth resistor and a ninth resistor; One end of the second capacitor is connected to the first node, and the other end is connected to one end of the eighth resistor and the ninth resistor; One end of the eighth resistor and the ninth resistor are both connected to the other end of the second capacitor, and the other end is connected to the second node.

8. The backlight control circuit according to claim 2, wherein: The power converter further includes: a filtering subcircuit; The filtering sub-circuit is configured to filter a first DC voltage provided by the main power supply.

9. The backlight control circuit according to claim 8, wherein: The filtering subcircuit includes: a third capacitor; One end of the third capacitor is connected to the input end, and the other end is connected to the ground end.

10. A backlight module, wherein: The backlight module includes the backlight control circuit according to any one of claims 1 to 9.

11. The backlight module according to claim 10, wherein: The backlight module further includes: a first backlight circuit and a second backlight circuit; The first electrode of the first backlight circuit is connected to the first port of the first connector, and the second electrode is connected to the second port of the first connector; The first electrode of the first backlight circuit is connected to the first port of the second connector, and the second electrode is connected to the second port of the second connector.

12. A display device, wherein: The display device includes a liquid crystal display panel and the backlight module according to any one of claims 10 to 11.

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