LED lamp driving circuit and display panel
By designing an LED lamp driving circuit that includes parallel drive branch and conductive units, the slight brightness problem of LED lamps when they are not driven and reduce standby power consumption, achieving more efficient power management.
Patent Information
- Application Number
- CN202421166170.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-05-24
AI Technical Summary
LED lights are prone to slightly bright abnormalities when they are not driven, and existing solutions increase standby power consumption.
An LED lamp driving circuit is designed, including a controller and at least two drive branches in parallel, each drive branch including an LED lamp, a switching unit and a conductive unit. When the switching unit is turned on, the conductive switching unit, the distributed capacitor and the conductive unit of another driving branch form a path, consuming the charge on the distributed capacitor and preventing slight brightness. In addition, the switch unit does not turn on during standby, avoiding additional standby power consumption.
It effectively solves the problem of slight brightness of LED lamps when they are not driven and reduces standby power consumption. Compared with the solution of increasing the discharge circuit, it achieves lower standby power consumption.
Smart Images
Figure CN222691908U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the field of electronic circuit technology, and in particular to an LED lamp driving circuit and a display panel. Background Art
[0002] Currently, LED lights are widely used in the electronics industry, especially in various display interfaces. In some display interfaces, such as when the display interface is large, the LED light may be dimly lit when not driven. For example, display interfaces such as stove display panels and washing machine display panels are prone to this abnormal phenomenon.
[0003] At present, a common way to solve the above abnormal phenomenon is to add a discharge circuit between the neutral line and the live line, such as a parallel inductor and resistor. However, this solution will increase the standby power consumption of the whole machine. Utility Model Content
[0004] The embodiments of the present application provide an LED lamp driving circuit and a display panel, which can solve the abnormal phenomenon that the LED lamp appears dim when not driven to light up, and reduce the standby power consumption.
[0005] In a first aspect, an embodiment of the present application provides an LED lamp driving circuit, which is provided on a printed circuit board, and the LED lamp driving circuit includes:
[0006] A controller and at least two driving branches, any two of the at least two driving branches are connected in parallel, and any of the driving branches includes an LED lamp, a switch unit and a conductive unit;
[0007] In any of the driving branches: the anode of the LED lamp is connected to a first power source, the cathode of the LED lamp is connected to a first node with a first end of the switch unit and a first end of the conductive unit respectively, and the second end of the switch unit is connected to the controller and is configured to be turned on or off in response to a first control signal output by the controller;
[0008] Wherein, on the printed circuit board, there is a distributed capacitance between any two of the first nodes, and when the switch unit in any of the driving branches is turned on, the turned-on switch unit, the distributed capacitance connected thereto, and the conductive unit of another driving branch connected to the distributed capacitance form a path to consume the charge on the distributed capacitance.
[0009] In one or more embodiments, any of the driving branches further includes a current limiting unit;
[0010] In any of the driving branches: the current limiting unit is connected between the anode of the LED lamp and the first power supply;
[0011] The current limiting unit is configured to limit the current flowing through the LED lamp.
[0012] In one or more embodiments, the LED lamp driving circuit further includes:
[0013] A switch branch, connected between the first power source and the anode of each of the LED lamps, and connected to the controller, and configured to turn on or off in response to a second control signal output by the controller
[0014] In one or more embodiments, the switch unit includes a first switch tube, a first resistor and a second resistor;
[0015] The first end of the first switch tube is connected to the controller through the first resistor, the first end of the first switch tube is also grounded through the second resistor, the second end of the first switch tube is grounded, and the third end of the first switch tube is connected to the first node.
[0016] In one or more embodiments, the first switch tube is an NPN transistor;
[0017] The first end of the first switch tube is the base of the NPN transistor, the second end of the first switch tube is the emitter of the NPN transistor, and the third end of the first switch tube is the collector of the NPN transistor.
[0018] In one or more embodiments, the conductive unit includes a third resistor;
[0019] The third resistor is connected between the first power source and the first node, or the third resistor is connected between the ground and the first node.
[0020] In one or more embodiments, the current limiting unit includes a fourth resistor;
[0021] The fourth resistor is connected between the anode of the LED lamp and the first power source.
[0022] In one or more embodiments, the switch branch includes a second switch tube, a fifth resistor and a sixth resistor;
[0023] The first end of the second switch tube is connected to the controller through the fifth resistor, the first end of the second switch tube is also connected to the first power supply through the sixth resistor, the second end of the second switch tube is connected to the first power supply, and the third end of the second switch tube is connected to the anode of the LED lamp.
[0024] In one or more embodiments, the second switch tube is a PNP type transistor;
[0025] The first end of the second switch tube is the base of the PNP transistor, the second end of the second switch tube is the emitter of the PNP transistor, and the third end of the second switch tube is the collector of the PNP transistor.
[0026] In a second aspect, an embodiment of the present application provides a display panel, including a printed circuit board and the LED lamp driving circuit as described above, wherein the LED lamp driving circuit is arranged on the printed circuit board.
[0027] The beneficial effect of the present application is that the LED lamp driving circuit of the embodiment of the present application is arranged on a printed circuit board. The LED lamp driving circuit includes a controller and at least two driving branches. Any two driving branches of the at least two driving branches are connected in parallel, and any driving branch includes an LED lamp, a switch unit and a conductive unit. In any driving branch: the anode of the LED lamp is connected to the first power supply, the cathode of the LED lamp is connected to the first end of the switch unit and the first end of the conductive unit at a first node respectively, the second end of the switch unit is connected to the controller, and is configured to be turned on or off in response to a first control signal output by the controller. Wherein, on the printed circuit board, there is a distributed capacitance between any two first nodes, and when the switch unit in any driving branch is turned on, the turned-on switch unit, the distributed capacitance connected thereto, and the conductive unit of another driving branch connected to the distributed capacitance form a path to consume the charge on the distributed capacitance, so that the abnormal phenomenon that the LED lamp is slightly bright when it is not driven to light up will not occur. Secondly, in standby mode, since the switch unit is not turned on, no power consumption will be generated in the conductive unit. It can be seen that no additional standby power consumption will be generated. Compared with the solution in the related art that causes additional standby power consumption due to the addition of a discharge circuit, the standby power consumption of the present application is lower. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplary descriptions are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.
[0029] Figure 1 This is a schematic diagram of the structure of the LED lamp driving circuit provided in the embodiment of the present application. Figure 1 ;
[0030] Figure 2 This is a schematic diagram of the structure of the LED lamp driving circuit provided in the embodiment of the present application. Figure 2 ;
[0031] Figure 3 This is a schematic diagram of the structure of the LED lamp driving circuit provided in the embodiment of the present application. Figure 3 ;
[0032] Figure 4is with Figure 3 The circuit structure corresponding to the structure shown is shown in FIG. Figure 1 ;
[0033] Figure 5 is with Figure 3 The circuit structure corresponding to the structure shown is shown in FIG. Figure 2 . DETAILED DESCRIPTION
[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0035] It should be noted that, when an element is described as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.
[0036] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.
[0037] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the LED lamp driving circuit provided in the embodiment of the present application. The LED lamp driving circuit 100 is arranged on a printed circuit board. Figure 1 As shown, the LED lamp driving circuit 100 includes a controller 10 and at least two driving branches. Any two of the at least two driving branches are connected in parallel, and any driving branch includes an LED lamp, a switch unit and a conductive unit.
[0038] At least two driving branches include a first driving branch A1, a second driving branch A2, ... an Nth driving branch AN, where N is an integer greater than or equal to 2. The first driving branch A1, the second driving branch A2, ... the Nth driving branch AN are all connected in parallel. The first driving branch A1, the second driving branch A2, ... the Nth driving branch AN all include an LED lamp, a switch unit, and a conductive unit. Taking the first driving branch A1 as an example, the first driving branch A1 includes an LED lamp LD1, a switch unit 20, and a conductive unit 30.
[0039] In any driving branch: the anode of the LED lamp is connected to the first power supply, the cathode of the LED lamp is connected to the first end of the switch unit and the first end of the conductive unit at a first node, the second end of the switch unit is connected to the controller, and is configured to be turned on or off in response to the first control signal output by the controller. Taking the first driving branch A1 as an example, the anode of the LED lamp LD1 is connected to the first power supply V1, the cathode of the LED lamp LD1 is connected to the first end of the switch unit 20 and the first end of the conductive unit 30 at a first node N1, and the second end of the switch unit 20 is connected to the controller 10. The switch unit 20 is configured to be turned on or off in response to the first control signal output by the controller 10.
[0040] In which, on the printed circuit board, there is a distributed capacitance between any two first nodes N1, and when the switch unit 20 in any driving branch is turned on, the turned-on switch unit 20, the distributed capacitance C1 connected thereto, and the conductive unit 30 of another driving branch connected to the distributed capacitance C1 form a path to consume the charge on the distributed capacitance C1.
[0041] Among them, a printed circuit board (PCB) is a substrate used to support and connect electronic components. PCBs are usually made of insulating materials, coated with conductive copper foil, and circuit patterns are formed through processes such as printing and etching. Electronic components can be connected to the PCB by welding or sockets to build the circuit of electronic devices.
[0042] When the LED lamp driving circuit 100 is arranged on a printed circuit board, an electric field is generated when the charges in the LED lamp driving circuit 100 move on the conductor. This electric field affects the nearby conductors, causing the charges to be attracted or repelled, thereby forming distributed capacitance. In particular, when the devices are densely packed and the printed circuit board area is large, the distributed capacitance will also increase. Moreover, when the electronic devices are working, the electric field will also change accordingly, thereby affecting the corresponding change of the distributed capacitance and causing interference to the circuit.
[0043] Take the first driving branch A1 and the second driving branch A2 as an example. There is a distributed capacitance C1 between the first node N1 in the first driving branch A1 and the first node N1 in the second driving branch A2. In the related art, no conductive unit is provided. Then, due to the existence of the distributed capacitance C1, when the LED lamp LD1 in the first driving branch A1 is driven to light up and the switch unit 20 in the first driving branch A1 is turned on, the first power source V1, the LED lamp LD1 in the second driving branch A2, the distributed capacitance C1 and the switch unit 20 in the first driving branch A1 form a path, causing the LED lamp LD1 in the second driving branch A2 to be in a dimly lit state. Based on this, the embodiment of the present application further provides a conductive unit 30. Then, when the LED lamp LD1 in the first driving branch A1 is driven to light up and the switch unit 20 in the first driving branch A1 is turned on, the switch unit 20 in the first driving branch A1, the distributed capacitor C1 connected to the switch unit 20 in the first driving branch A1, and the conductive unit 30 of the second driving branch A1 connected to the distributed capacitor C1 form a path, and the charge on the distributed capacitor C1 is quickly consumed. The first power source V1, the LED lamp LD1 in the second driving branch A2, the distributed capacitor C1 and the switch unit 20 in the first driving branch A1 cannot form a path, and the LED lamp LD1 in the second driving branch A2 will not be in a dimly lit state. Therefore, the abnormal phenomenon that the LED lamp is dimly lit when it is not driven to light up is solved.
[0044] It is understandable that there is a distributed capacitor C1 between any two first nodes, but the charge on the distributed capacitor C1 will be quickly consumed by the corresponding conductive unit to prevent the abnormal phenomenon that any LED lamp is dimly lit when not driven to light up. For example, there is also a distributed capacitor C1 between the first driving branch A1 and the Nth driving branch AN. When the switch unit 20 of the Nth driving branch AN is turned on, the charge on the distributed capacitor C1 will be quickly consumed by the conductive unit 30 of the first driving branch A1, and the LED lamp LD1 of the first driving branch A1 will not be dimly lit.
[0045] In addition, in the related art, the way to solve the abnormal phenomenon that the LED lamp is dimly lit when it is not driven to light up is usually to add a discharge circuit between the neutral line and the live line, such as a parallel inductor and resistor. However, this method will increase the extra standby power consumption of the whole machine. In the embodiment of the present application, in standby mode, each switch unit 20 will not be turned on, and each conductive unit 30 will not generate additional standby power consumption. It can be seen that compared with the related art, the standby power consumption of the present application is lower, thereby achieving the purpose of reducing power consumption.
[0046] In one embodiment of the present application, Figure 2 As shown, any driving branch further includes a current limiting unit 40 .
[0047] In any driving branch, the current limiting unit 40 is connected between the anode of the LED lamp LD1 and the first power source V1. The current limiting unit 40 is configured to limit the current flowing through the LED lamp LD1.
[0048] Take the first driving branch A1 as an example. The current limiting unit 40 in the first driving branch A1 is connected between the anode of the LED lamp LD1 in the first driving branch A1 and the first power source V1. The current limiting unit 40 in the first driving branch A1 is used to limit the current flowing through the LED lamp LD1 in the first driving branch A1.
[0049] In one embodiment of the present application, Figure 3 As shown, the LED lamp driving circuit 100 further includes a switch branch 50. The switch branch 50 is connected between the first power source V1 and the anode of each LED lamp LD1, and is connected to the controller 10. The switch branch 50 is configured to be turned on or off in response to a second control signal output by the controller 10.
[0050] By providing the switch branch 50 , the first power source V1 and the electrical components (such as the connection between the LED LD1 ) can be disconnected in standby mode, which helps to avoid additional power loss.
[0051] Please refer to Figure 4 , Figure 4 An example is shown with Figure 3 A circuit structure corresponding to the structure shown in FIG. Figure 4 As shown, the switch unit 20 in each driving branch includes a first switch tube Q1, a first resistor R1 and a second resistor R2. For example, the switch unit 20 in the first driving branch A1 includes a first switch tube Q1, a first resistor R1 and a second resistor R2.
[0052] The first end of the first switch tube Q1 is connected to the controller 10 through the first resistor R1, the first end of the first switch tube Q1 is also grounded GND through the second resistor R2, the second end of the first switch tube Q1 is grounded GND, and the third end of the first switch tube Q1 is connected to the first node N1.
[0053] Specifically, the first resistor R1 is used for current limiting. The combination of the first resistor R1 and the second resistor R2 is used for voltage division. The second resistor R2 is also used to provide a discharge circuit when the first switch tube Q1 is turned off, so that the first switch tube Q1 is turned off quickly.
[0054] In this embodiment, the first switch tube Q1 is an NPN transistor, wherein the first end of the first switch tube Q1 is the base of the NPN transistor, the second end of the first switch tube Q1 is the emitter of the NPN transistor, and the third end of the first switch tube Q1 is the collector of the NPN transistor.
[0055] In addition, the first switch tube Q1 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.
[0056] In this embodiment, the conductive unit 30 includes a third resistor R3 .
[0057] The third resistor R3 is connected between the first power source V1 and the first node N1.
[0058] In this embodiment, the current limiting unit 40 includes a fourth resistor R4.
[0059] The fourth resistor R4 is connected between the anode of the LED lamp LD1 and the first power source V1.
[0060] In this embodiment, the switch branch 50 includes a second switch tube Q2 , a fifth resistor R5 , and a sixth resistor R6 .
[0061] Among them, the first end of the second switch tube Q2 is connected to the controller 10 through the fifth resistor R5, the first end of the second switch tube Q3 is also connected to the first power supply V1 through the sixth resistor R6, the second end of the second switch tube Q2 is connected to the first power supply V1, and the third end of the second switch tube Q2 is connected to the anode of the LED lamp LD1 through the fourth resistor R4.
[0062] Specifically, the fifth resistor R5 is used for current limiting. The combination of the fifth resistor R5 and the sixth resistor R6 is used for voltage division. The sixth resistor R6 is also used to provide a discharge loop when the second switch tube Q2 is turned off, so that the second switch tube Q2 is turned off quickly.
[0063] In this embodiment, the second switch tube Q2 is a PNP transistor as an example, wherein the first end of the second switch tube Q2 is the base of the PNP transistor, the second end of the second switch tube Q2 is the emitter of the PNP transistor, and the third end of the second switch tube Q2 is the collector of the PNP transistor.
[0064] In addition, the second switch tube Q2 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.
[0065] Take the first driving branch A1 and the second driving branch A2 as an example. Figure 4 The structure shown is explained again.
[0066] When it is necessary to drive the LED lamp LD1 in the first driving branch A1 to light up, the first control signal output by the controller 10 (the first control signal is a level signal, and it is a high level at this time) controls the first switch tube Q1 to turn on. It can be understood that when the first control signal is at a low level, the first switch tube Q1 is turned off. At the same time, the controller 10 outputs a second control signal (the second control signal is a level signal, and it is a level at this time) to control the second switch tube Q2 to turn on. It can be understood that when the second control signal is at a high level, the second switch tube Q2 is turned off. The first power supply V1, the second switch tube Q2 in the first driving branch A1, the fourth resistor R4, the LED lamp LD1 and the first switch tube Q1 form a path, and the LED lamp LD1 in the first driving branch A1 is lit.
[0067] In this case, in the related art, since the third resistor R3 is not provided, and there is a distributed capacitor C1 between the first node N1 in the first driving branch A1 and the first node N1 in the second driving branch A2. When there is charge in the distributed capacitor C1, the first power source V1, the fourth resistor R4 in the second driving branch A2, the LED lamp LD1 in the second driving branch A2, the distributed capacitor C1 and the first switch tube Q1 in the first driving branch A1 form a path, and the LED lamp LD1 in the second driving branch A2 will be in a slightly bright state.
[0068] Based on this, the present application sets a third resistor R3, and then, when the LED lamp LD1 in the first driving branch A1 is driven to light up and the first switch tube Q1 is turned on, the first switch tube Q1 in the first driving branch A1, the distributed capacitor C1, and the third resistor R3 of the second driving branch A1 connected to the distributed capacitor C1, that is, the first power supply V1, form a path, and the charge on the distributed capacitor C1 is quickly consumed. The first power supply V1, the fourth resistor R4 in the second driving branch A2, the LED lamp LD1 in the second driving branch A2, the distributed capacitor C1 and the first switch tube Q1 in the first driving branch A1 cannot form a path, and the LED lamp LD1 in the second driving branch A2 will not be in a dimly lit state. Similarly, when it is necessary to drive the LED lamp LD1 in the second driving branch A2 to light up, the third resistor R3 in the first driving branch A1 can also be used to prevent the LED lamp LD1 in the first driving branch A1 from being dimly lit. In summary, the abnormal phenomenon that each LED lamp appears dimly lit when not driven to light up is prevented, that is, the abnormal phenomenon that each LED lamp appears dimly lit when not driven to light up is solved.
[0069] Secondly, in the related art, the way to solve the abnormal phenomenon that the LED lamp is dimly lit when it is not driven to light up is usually to add a discharge circuit between the neutral line and the live line, such as a parallel inductor and resistor. However, this method will increase the additional standby power consumption of the whole machine. In the embodiment of the present application, in standby mode, each first switch tube Q1 and the second switch tube Q2 will not be turned on, and each third resistor R3 will not generate additional standby power consumption. It can be seen that compared with the related art, the standby power consumption of the present application is lower, thereby achieving the purpose of reducing power consumption.
[0070] It should be noted that if Figure 4 The hardware structure of the LED lamp driving circuit 100 shown is only an example, and the LED lamp driving circuit 100 may have more or fewer components than shown in the figure, may combine two or more components, or may have a different component configuration. The various components shown in the figure may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and / or application-specific integrated circuits.
[0071] For example, in one embodiment of the present application, Figure 5 As shown, the third resistor R3 can also be configured to be connected between the first node N1 and the ground GND, which can also provide a loop for consuming the charge on the distributed capacitor C1 to solve the abnormal phenomenon that the LED lamp is dimly lit when not driven to light up.
[0072] The embodiment of the present application further provides a display panel, which includes a printed circuit board and the LED lamp driving circuit 100 in any embodiment of the present application, and the LED lamp driving circuit 100 is arranged on the printed circuit board.
[0073] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
[0074] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. It should be understood by ordinary technicians in this field that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An LED lamp driving circuit, characterized in that: The LED lamp driving circuit is provided on a printed circuit board and comprises: A controller and at least two driving branches, any two of the at least two driving branches are connected in parallel, and any of the driving branches includes an LED lamp, a switch unit and a conductive unit; In any of the driving branches: the anode of the LED lamp is connected to a first power source, the cathode of the LED lamp is connected to a first node with a first end of the switch unit and a first end of the conductive unit respectively, and the second end of the switch unit is connected to the controller and is configured to be turned on or off in response to a first control signal output by the controller; Wherein, on the printed circuit board, there is a distributed capacitance between any two of the first nodes, and when the switch unit in any of the driving branches is turned on, the turned-on switch unit, the distributed capacitance connected thereto, and the conductive unit of another driving branch connected to the distributed capacitance form a path to consume the charge on the distributed capacitance.
2. The LED lamp driving circuit according to claim 1, characterized in that: Any of the driving branches further includes a current limiting unit; In any of the driving branches: the current limiting unit is connected between the anode of the LED lamp and the first power supply; The current limiting unit is configured to limit the current flowing through the LED lamp.
3. The LED lamp driving circuit according to claim 1 or 2, characterized in that: Also includes: The switch branch is connected between the first power source and the anode of each of the LED lamps and is connected to the controller, and is configured to be turned on or off in response to a second control signal output by the controller.
4. The LED lamp driving circuit according to claim 1, characterized in that: The switch unit includes a first switch tube, a first resistor and a second resistor; The first end of the first switch tube is connected to the controller through the first resistor, the first end of the first switch tube is also grounded through the second resistor, the second end of the first switch tube is grounded, and the third end of the first switch tube is connected to the first node.
5. The LED lamp driving circuit according to claim 4, characterized in that: The first switch tube is an NPN type transistor; The first end of the first switch tube is the base of the NPN transistor, the second end of the first switch tube is the emitter of the NPN transistor, and the third end of the first switch tube is the collector of the NPN transistor.
6. The LED lamp driving circuit according to claim 1, characterized in that: The conductive unit includes a third resistor; The third resistor is connected between the first power source and the first node, or the third resistor is connected between the ground and the first node.
7. The LED lamp driving circuit according to claim 2, characterized in that: The current limiting unit includes a fourth resistor; The fourth resistor is connected between the anode of the LED lamp and the first power source.
8. The LED lamp driving circuit according to claim 3, characterized in that: The switch branch includes a second switch tube, a fifth resistor and a sixth resistor; The first end of the second switch tube is connected to the controller through the fifth resistor, the first end of the second switch tube is also connected to the first power supply through the sixth resistor, the second end of the second switch tube is connected to the first power supply, and the third end of the second switch tube is connected to the anode of the LED lamp.
9. The LED lamp driving circuit according to claim 8, characterized in that: The second switch tube is a PNP type triode; The first end of the second switch tube is the base of the PNP transistor, the second end of the second switch tube is the emitter of the PNP transistor, and the third end of the second switch tube is the collector of the PNP transistor.
10. A display panel, characterized in that: It comprises a printed circuit board and the LED lamp driving circuit according to any one of claims 1 to 9, wherein the LED lamp driving circuit is arranged on the printed circuit board.